US3769795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multipressure steam system for unfired combined cycle powerplant
Assignee: TURBO POWER AND MARINES SYST I
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Filing: 1972-03-22
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Granted: 1973-11-06
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Expires: 1992-03-22
Abstract
Abstract An exhaust heat recovery steam generator is utilized exclusively to develop shaft power to drive a load and includes a high pressure evaporator, low pressure evaporator and deaerator evaporator positioned in that order in the exhaust stack and has provisions for providing deaerated feedwater to each evaporator. The deaerated feedwater is conducted through a split flow system to the low pressure and high pressure evaporator, and preferably also to the deaerator evaporator, to permit individual chemical treatment of the feedwater being provided exclusively to each evaporator so that deaerated and optimally chemically treated feedwater can be passed through each evaporator to abate corrosion and fouling therein. The feedwater is passed through each evaporator at a temperature above the condensation point of the exhaust gas passing thereover. All steam generated by the low pressure and high pressure evaporators is provided exclusively to a steam turbine to drive a shaft driven load and the deaerator evaporator providing steam solely to heat and deaerate the feedwater. The system is optimized in that the pressure levels for high and low pressure evaporators are optimized to produce the maximum practical steam turbine power from the energy in the gas turbine exhaust.
Inventors
- 👤 E Rostrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:15
CPC Classifications
F; F01; F01K; F01K23/00; F01K23/02; F01K23/06; F01K23/10; F01K23/106; F01K23/108; Y; Y02; Y02E; Y02E20/00; Y02E20/16
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
513 words
A combined gas turbine-steam turbine cycle powerplant wherein the exhaust gases of the gas turbine provide all of the heat to the steam boiler to generate steam for the steam burbine which is connected to drive a shaft driven load including: A. a gas turbine engine, B. a steam turbine engine, C. an exhaust stack boiler through which the gas turbine engine exhaust gases are passed and including: 1. an exhaust stack positioned so that the exhaust gases from said gas turbine engine pass therethrough and having an exhaust gas inlet end and an exhaust gaS outlet end, 2. steam generating means operatively associated with said exhaust stack including: a. a superheater having tubes extending across said exhaust stack closest said exhaust gas inlet end, b. a high pressure evaporator having tubes extending across said exhaust stack next downstream of the superheater, c. a high temperature economizer having tubes extending across said exhaust stack next downstream of said high pressure evaporator, d. a low pressure evaporator having tubes extending across said exhaust stack next downstream of said high temperature economizer, e. a low temperature economizer having tubes extending across said exhaust stack next downstream of said low pressure evaporator, and f. a deaerator evaporator having tubes extending across said exhaust gas stack next downstream of said low temperature economizer, D. means to pass feedwater through said steam generating means including three feedwater flow path conduit systems including: 1. a first flow path conduit system directing a first selected quantity of feedwater exclusively to the deaerator evaporator at a selected temperature so that the feedwater being passed through said deaerator evaporator is above the temperature of the condensation point of the exhaust gases passing over the deaerator evaporator, 2. a second flow path conduit system passing a second selected quantity of feedwater exclusively through said low temperature economizer and then into said low pressure evaporator so that the temperature of the feedwater being passed through both is above the condensation point of the exhaust gases being passed thereover, and 3. a third flow path conduit system directing a third selected quantity of feedwater from said low temperature economizer exclusively through said high temperature economizer and said high pressure evaporator such that the temperature of the feedwater passing through both is above the condensation point of the exhaust gases passing thereover, E. means to extract steam from said high pressure evaporator and pass it through said superheater and conduct said superheated steam to a high pressure station in the steam turbine, F. means to extract steam from said low pressure evaporator and direct it to a low pressure station in said steam turbine so as to cooperate with said superheated steam to power said steam turbine to drive said shaft driven load, and G. means to add selected quantities of water purifying chemicals to the selected quantity of feedwater introduced exclusively to the deaerator evaporator, to the selected quantity of feedwater being directed exclusively to the low pressure evaporator, and to the selected quantity of feedwater being directed exclusively to the high pressure evaporator, respectively.
Claim 2
Dependent Claim
513 words
A combined gas turbine-steam turbine cycle powerplant wherein the exhaust gases of the gas turbine provide all of the heat to the steam boiler to generate steam for the steam burbine which is connected to drive a shaft driven load including: A. a gas turbine engine, B. a steam turbine engine, C. an exhaust stack boiler through which the gas turbine engine exhaust gases are passed and including: 1. an exhaust stack positioned so that the exhaust gases from said gas turbine engine pass therethrough and having an exhaust gas inlet end and an exhaust gaS outlet end, 2. steam generating means operatively associated with said exhaust stack including: a. a superheater having tubes extending across said exhaust stack closest said exhaust gas inlet end, b. a high pressure evaporator having tubes extending across said exhaust stack next downstream of the superheater, c. a high temperature economizer having tubes extending across said exhaust stack next downstream of said high pressure evaporator, d. a low pressure evaporator having tubes extending across said exhaust stack next downstream of said high temperature economizer, e. a low temperature economizer having tubes extending across said exhaust stack next downstream of said low pressure evaporator, and f. a deaerator evaporator having tubes extending across said exhaust gas stack next downstream of said low temperature economizer, D. means to pass feedwater through said steam generating means including three feedwater flow path conduit systems including: 1. a first flow path conduit system directing a first selected quantity of feedwater exclusively to the deaerator evaporator at a selected temperature so that the feedwater being passed through said deaerator evaporator is above the temperature of the condensation point of the exhaust gases passing over the deaerator evaporator, 2. a second flow path conduit system passing a second selected quantity of feedwater exclusively through said low temperature economizer and then into said low pressure evaporator so that the temperature of the feedwater being passed through both is above the condensation point of the exhaust gases being passed thereover, and 3. a third flow path conduit system directing a third selected quantity of feedwater from said low temperature economizer exclusively through said high temperature economizer and said high pressure evaporator such that the temperature of the feedwater passing through both is above the condensation point of the exhaust gases passing thereover, E. means to extract steam from said high pressure evaporator and pass it through said superheater and conduct said superheated steam to a high pressure station in the steam turbine, F. means to extract steam from said low pressure evaporator and direct it to a low pressure station in said steam turbine so as to cooperate with said superheated steam to power said steam turbine to drive said shaft driven load, and G. means to add selected quantities of water purifying chemicals to the selected quantity of feedwater introduced exclusively to the deaerator evaporator, to the selected quantity of feedwater being directed exclusively to the low pressure evaporator, and to the selected quantity of feedwater being directed exclusively to the high pressure evaporator, respectively.
Claim 3
Dependent Claim
190 words
steam generating means operatively associated with said waste-heat stack including: a. a superheater having tubes extending across said waste-heat stack closest said inlet end, b. a high pressure evaporator having tubes extending across said waste-heat stack next downstream of the superheater, c. a high temperature economizer having tubes extending across said waste-heat stack next downstream of said high pressure evaporator, d. a low pressure evaporator having tubes extending across said waste heat stack next downstream of said high temperature economizer, e. a low temperature economizer having tubes Extending across said waste heat stack next downstream of said low pressure evaporator, and f. a deaerator evaporator having tubes extending across said waste-heat stack next downstream of said low temperature economizer, C. a condenser connected to said steam turbine to receive steam therefrom for condensation therein, D. a feedwater deaerator connected to said condenser to receive condensate feedwater therefrom, E. a boiler feed pump connected to said deaerator to receive deaerated feedwater therefrom, F. means to pass deaerated feedwater from said boiler feed pump through said steam generating means and to said steam turbine including three feedwater flow path conduit systems including:
Claim 4
Dependent Claim
190 words
steam generating means operatively associated with said waste-heat stack including: a. a superheater having tubes extending across said waste-heat stack closest said inlet end, b. a high pressure evaporator having tubes extending across said waste-heat stack next downstream of the superheater, c. a high temperature economizer having tubes extending across said waste-heat stack next downstream of said high pressure evaporator, d. a low pressure evaporator having tubes extending across said waste heat stack next downstream of said high temperature economizer, e. a low temperature economizer having tubes Extending across said waste heat stack next downstream of said low pressure evaporator, and f. a deaerator evaporator having tubes extending across said waste-heat stack next downstream of said low temperature economizer, C. a condenser connected to said steam turbine to receive steam therefrom for condensation therein, D. a feedwater deaerator connected to said condenser to receive condensate feedwater therefrom, E. a boiler feed pump connected to said deaerator to receive deaerated feedwater therefrom, F. means to pass deaerated feedwater from said boiler feed pump through said steam generating means and to said steam turbine including three feedwater flow path conduit systems including:
Claim 5
Dependent Claim
269 words
steam generating means operatively associated with said exhaust stack including: a. a superheater having tubes extending across said exhaust stack closest said exhaust gas inlet end, b. a high pressure evaporator having tubes extending across said exhaust stack next downstream of the superheater, c. a high temperature economizer having tubes extending across said exhaust stack next downstream of said high pressure evaporator, d. a low pressure evaporator having tubes extending across said exhaust stack next downstream of said high temperature economizer, e. a low temperature economizer having tubes extending across said exhaust stack next downstream of said low pressure evaporator, and f. a deaerator evaporator having tubes extending across said exhaust gas stack next downstream of said low temperature economizer, D a condenser connected to said steam turbine to receive steam therefrom for condensation therein, E a feedwater deaerator connected to said condenser to receive condensate feedwater therefrom, F a boiler feed pump connected to said deaerator to receive deaerated feedwater therefrom, G means to pass deaerated feedwater from said boiler feed pump through said steam generating means and to said steam turbine including three feedwater flow path conduit systems including: 1 a first flow path conduit system directing a first selected quantity of deaerated feedwater exclusively to the deaerator evaporator from said boiler feed pump including: a. a first conduit connecting said boiler feed pump to said deaerator evaporator, b. a second conduit conducting low pressure steam generated in said deaerator evaporator to said deaerator to serve as the deaerating steam and to be condensed therein for recycling as a saturated mixture through said first and second conduits,
Claim 6
Dependent Claim
269 words
steam generating means operatively associated with said exhaust stack including: a. a superheater having tubes extending across said exhaust stack closest said exhaust gas inlet end, b. a high pressure evaporator having tubes extending across said exhaust stack next downstream of the superheater, c. a high temperature economizer having tubes extending across said exhaust stack next downstream of said high pressure evaporator, d. a low pressure evaporator having tubes extending across said exhaust stack next downstream of said high temperature economizer, e. a low temperature economizer having tubes extending across said exhaust stack next downstream of said low pressure evaporator, and f. a deaerator evaporator having tubes extending across said exhaust gas stack next downstream of said low temperature economizer, D a condenser connected to said steam turbine to receive steam therefrom for condensation therein, E a feedwater deaerator connected to said condenser to receive condensate feedwater therefrom, F a boiler feed pump connected to said deaerator to receive deaerated feedwater therefrom, G means to pass deaerated feedwater from said boiler feed pump through said steam generating means and to said steam turbine including three feedwater flow path conduit systems including: 1 a first flow path conduit system directing a first selected quantity of deaerated feedwater exclusively to the deaerator evaporator from said boiler feed pump including: a. a first conduit connecting said boiler feed pump to said deaerator evaporator, b. a second conduit conducting low pressure steam generated in said deaerator evaporator to said deaerator to serve as the deaerating steam and to be condensed therein for recycling as a saturated mixture through said first and second conduits,
Claim 7
Dependent Claim
136 words
a second flow path conduit system directing a second selected quantity of deaerated feedwater exclusively to the low pressure evaporator including: a. a first conduit extending between said boiler feed pump and said low temperature economizer through which a selected quantity of deaerated feedwater is passed to be elevated to a selected temperature above the condensation temperature of the low temperature economizer and the low pressure evaporator, b. a second conduit connecting said low temperature economizer to said low pressure evaporator to direct said second selected quantity of deaerated and selectively heated feedwater at a temperature above the low pressure evaporator condensation point to the low pressure evaporator, and c. a conduit connecting said low pressure evaporator to said steam turbine to direct all the steam generated in the low pressure evaporator to said steam turbine,
Claim 8
Dependent Claim
136 words
a second flow path conduit system directing a second selected quantity of deaerated feedwater exclusively to the low pressure evaporator including: a. a first conduit extending between said boiler feed pump and said low temperature economizer through which a selected quantity of deaerated feedwater is passed to be elevated to a selected temperature above the condensation temperature of the low temperature economizer and the low pressure evaporator, b. a second conduit connecting said low temperature economizer to said low pressure evaporator to direct said second selected quantity of deaerated and selectively heated feedwater at a temperature above the low pressure evaporator condensation point to the low pressure evaporator, and c. a conduit connecting said low pressure evaporator to said steam turbine to direct all the steam generated in the low pressure evaporator to said steam turbine,
Claim 9
Dependent Claim
50 words
a second flow path conduit system passing a second selected quantity of feedwater exclusively through said low temperature economizer and then into said low pressure evaporator so that the temperature of the feedwater being passed through both is above the condensation point of the waste-heat gases being passed thereover, and
Claim 10
Dependent Claim
50 words
a second flow path conduit system passing a second selected quantity of feedwater exclusively through said low temperature economizer and then into said low pressure evaporator so that the temperature of the feedwater being passed through both is above the condensation point of the waste-heat gases being passed thereover, and
Claim 11
Dependent Claim
60 words
A powerplant according to claim 1 and including: A. a condenser connected to said turbine to receive steam therefrom for condensation therein, B. a feedwater deaerator positioned between said condenser and said deaerator evaporator, and C. a boiler feed pump positioned between said deaerator and said three feedwater flow path conduit systems so as to pump deaerated boiler feedwater therethrough.
Claim 12
Dependent Claim
50 words
a second flow path conduit system passing a second selected quantity of feedwater exclusively through said low temperature economizer and then into said low pressure evaporator so that the temperature of the feedwater being passed through both is above the condensation point of the exhaust gases being passed thereover, and
Claim 13
Dependent Claim
50 words
a second flow path conduit system passing a second selected quantity of feedwater exclusively through said low temperature economizer and then into said low pressure evaporator so that the temperature of the feedwater being passed through both is above the condensation point of the exhaust gases being passed thereover, and
Claim 14
Dependent Claim
138 words
steam generating means operatively associated with said exhaust stack including: a. a superheater having tubes extending across said exhaust stack closest said exhaust gas inlet end, b. a high pressure evaporator having tubes extending across said exhaust stack next downstream of the superheater, c. a high temperature economizer having tubes extending across said exhaust stack next downstream of said high pressure evaporator, d. a low pressure evaporator having tubes extending across said exhaust stack next downstream of said high temperature economizer, e. a low temperature economizer having tubes extending across said exhaust stack next downstream of said low pressure evaporator, and f. a deaerator evaporator having tubes extending across said exhaust gas stack next downstream of said low temperature economizer, D. means to pass feedwater through said steam generating means including three feedwater flow path conduit systems including:
Claim 15
Dependent Claim
138 words
steam generating means operatively associated with said exhaust stack including: a. a superheater having tubes extending across said exhaust stack closest said exhaust gas inlet end, b. a high pressure evaporator having tubes extending across said exhaust stack next downstream of the superheater, c. a high temperature economizer having tubes extending across said exhaust stack next downstream of said high pressure evaporator, d. a low pressure evaporator having tubes extending across said exhaust stack next downstream of said high temperature economizer, e. a low temperature economizer having tubes extending across said exhaust stack next downstream of said low pressure evaporator, and f. a deaerator evaporator having tubes extending across said exhaust gas stack next downstream of said low temperature economizer, D. means to pass feedwater through said steam generating means including three feedwater flow path conduit systems including:
Claim 16
Dependent Claim
174 words
a third flow path conduit system directing a third selected quantity of feedwater from said low temperature economizer exclusively through said high temperature economizer and said high pressure evaporator such that the temperature of the feedwater passing through both is above the condensation point of the exhaust gases passing thereover, E. means to extract steam from said high pressure evaporator and pass it through said superheater and conduct said superheated steam to a high pressure station in the steam turbine, F. means to extract steam from said low pressure evaporator and direct it to a low pressure station in said steam turbine so as to cooperate with said superheated steam to power said steam turbine to drive said shaft driven load, and G. means to add selected quantities of water purifying chemicals to the selected quantity of feedwater introduced exclusively to the deaerator evaporator, to the selected quantity of feedwater being directed exclusively to the low pressure evaporator, and to the selected quantity of feedwater being directed exclusively to the high pressure evaporator, respectively.
Claim 17
Dependent Claim
174 words
a third flow path conduit system directing a third selected quantity of feedwater from said low temperature economizer exclusively through said high temperature economizer and said high pressure evaporator such that the temperature of the feedwater passing through both is above the condensation point of the exhaust gases passing thereover, E. means to extract steam from said high pressure evaporator and pass it through said superheater and conduct said superheated steam to a high pressure station in the steam turbine, F. means to extract steam from said low pressure evaporator and direct it to a low pressure station in said steam turbine so as to cooperate with said superheated steam to power said steam turbine to drive said shaft driven load, and G. means to add selected quantities of water purifying chemicals to the selected quantity of feedwater introduced exclusively to the deaerator evaporator, to the selected quantity of feedwater being directed exclusively to the low pressure evaporator, and to the selected quantity of feedwater being directed exclusively to the high pressure evaporator, respectively.
Claim 18
Dependent Claim
207 words
An unfired, waste-heat-steam turbine cycle powerplant wherein waste-heat provides all of the heat to the steam boiler to generate steam for the steam turbine which is connected to drive a shaft driven load including: A. a steam turbine, B. a waste-heat stack boiler through which the waste-heat is passed and including: 1 a waste-heat stack positioned so that the waste-heat passes therethrough and having an inlet end and an outlet end, 2 steam generating means operatively associated with said waste-heat stack including: a. a superheater having tubes extending across said waste-heat stack closest said inlet end, b. a high pressure evaporator having tubes extending across said waste-heat stack next downstream of the superheater, c. a high temperature economizer having tubes extending across said waste-heat stack next downstream of said high pressure evaporator, d. a low pressure evaporator having tubes extending across said waste-heat stack next downstream of said high temperature economizer, e. a low temperature economizer having tubes extending across said waste-heat stack next downstream of said low pressure evaporator, and f. a deaerator evaporator having tubes extending across said waste-heat stack next downstream of said low temperature economizer, C. means to pass feedwater through said steam generating means including three feedwater flow path conduit systems including:
Claim 19
Dependent Claim
207 words
An unfired, waste-heat-steam turbine cycle powerplant wherein waste-heat provides all of the heat to the steam boiler to generate steam for the steam turbine which is connected to drive a shaft driven load including: A. a steam turbine, B. a waste-heat stack boiler through which the waste-heat is passed and including: 1 a waste-heat stack positioned so that the waste-heat passes therethrough and having an inlet end and an outlet end, 2 steam generating means operatively associated with said waste-heat stack including: a. a superheater having tubes extending across said waste-heat stack closest said inlet end, b. a high pressure evaporator having tubes extending across said waste-heat stack next downstream of the superheater, c. a high temperature economizer having tubes extending across said waste-heat stack next downstream of said high pressure evaporator, d. a low pressure evaporator having tubes extending across said waste-heat stack next downstream of said high temperature economizer, e. a low temperature economizer having tubes extending across said waste-heat stack next downstream of said low pressure evaporator, and f. a deaerator evaporator having tubes extending across said waste-heat stack next downstream of said low temperature economizer, C. means to pass feedwater through said steam generating means including three feedwater flow path conduit systems including:
Claim 20
Dependent Claim
174 words
a third flow path conduit system directing a third selected quantity of feedwater from said low temperature economizer exclusively through said high temperature economizer and said high pressure evaporator such that the temperature of the feedwater passing through both is above the condensation point of the waste-heat gases passing thereover, D. means to extract steam from said high pressure evaporator and pass it through said superheater and conduct said superheated steam to a high pressure station in the steam turbine, E. means to extract steam from said low pressure evaporator and direct it to a low pressure station in said steam turbine so as to cooperate with said superheated steam to power said steam turbine to drive said shaft driven load, and F. means to add selected quantities of water purifying chemicals to the selected quantity of feedwater introduced exclusively to the deaerator evaporator, to the selected quantity of feedwater being directed exclusively to the low pressure evaporator, and to the selected quantity of feedwater being directed exclusively to the high pressure evaporator, respectively.
Claim 21
Dependent Claim
174 words
a third flow path conduit system directing a third selected quantity of feedwater from said low temperature economizer exclusively through said high temperature economizer and said high pressure evaporator such that the temperature of the feedwater passing through both is above the condensation point of the waste-heat gases passing thereover, D. means to extract steam from said high pressure evaporator and pass it through said superheater and conduct said superheated steam to a high pressure station in the steam turbine, E. means to extract steam from said low pressure evaporator and direct it to a low pressure station in said steam turbine so as to cooperate with said superheated steam to power said steam turbine to drive said shaft driven load, and F. means to add selected quantities of water purifying chemicals to the selected quantity of feedwater introduced exclusively to the deaerator evaporator, to the selected quantity of feedwater being directed exclusively to the low pressure evaporator, and to the selected quantity of feedwater being directed exclusively to the high pressure evaporator, respectively.
Claim 22
Dependent Claim
260 words
a third flow path conduit system directing a third selected quantity of deaerated feedwater from said boiler feed pump exclusively to said high pressure evaporator and including: a. a first conduit connecting said boiler feedwater pump to said low temperature economizer, b. a second conduit connecting said low temperature economizer to said high temperature economizer in which the deaerated feedwater is heated to a temperature above the condensation temperature of said high pressure evaporator, c. a third conduit connecting said high temperature economizer to said high pressure evaporator so that the deaerated feedwater passing through said first and second conduits and said low temperature and high temperature economizers is directed into said high pressure evaporator above the condensation temperature thereof, d. a fourth conduit connecting said high pressure evaporator to said superheater, and e a fifth conduit connecting said superheater to said steam turbine so that the steam generated in said high pressure evaporator is passed through said fourth conduit to be superheated in passing through said superheater and then directed through said fifth conduit to said steam turbine so that all of the steam generated in this multipressure system is utilized to generate shaft energy in said steam turbine to drive a shaft driven load, H means to add selected quantities of water purifying chemicals to the selected quantity of feedwater being so introduced exclusively to the deaerator evaporator, to the selected quantity of feedwater being directed exclusively to the low pressure evaporator, and to the selected quantity of feedwater being directed exclusively to the high pressure evaporator, respectively.
Claim 23
Dependent Claim
260 words
a third flow path conduit system directing a third selected quantity of deaerated feedwater from said boiler feed pump exclusively to said high pressure evaporator and including: a. a first conduit connecting said boiler feedwater pump to said low temperature economizer, b. a second conduit connecting said low temperature economizer to said high temperature economizer in which the deaerated feedwater is heated to a temperature above the condensation temperature of said high pressure evaporator, c. a third conduit connecting said high temperature economizer to said high pressure evaporator so that the deaerated feedwater passing through said first and second conduits and said low temperature and high temperature economizers is directed into said high pressure evaporator above the condensation temperature thereof, d. a fourth conduit connecting said high pressure evaporator to said superheater, and e a fifth conduit connecting said superheater to said steam turbine so that the steam generated in said high pressure evaporator is passed through said fourth conduit to be superheated in passing through said superheater and then directed through said fifth conduit to said steam turbine so that all of the steam generated in this multipressure system is utilized to generate shaft energy in said steam turbine to drive a shaft driven load, H means to add selected quantities of water purifying chemicals to the selected quantity of feedwater being so introduced exclusively to the deaerator evaporator, to the selected quantity of feedwater being directed exclusively to the low pressure evaporator, and to the selected quantity of feedwater being directed exclusively to the high pressure evaporator, respectively.
Claim 24
Dependent Claim
259 words
a third flow path conduit system directing a third selected quantity of deaerated feedwater from said boiler feed pump exclusively to said high pressure evaporator and including: a. a first conduit connecting said boiler feedwater pump to said low temperature economizer, b. a second conduit connecting said low temperature economizer to said high temperature economizer in which the deaerated feedwater is heated to a temperature above the condensation temperature of said high pressure evaporator, c. a third conduit connecting said high temperature economizer to said high pressure evaporator so that the deaerated feedwater passing through said first and second conduits and said low temperature and high temperature economizers is directed into said high pressure evaporator above the condensation temperature thereof, d. a fourth conduit connecting said high pressure evaporator to said superheater, and e. a fifth conduit connecting said superheater to said steam turbine so that the steam generated in said high pressure evaporator is passed through said fourth conduit to be superheated in passing through said superheater and then directed through said fifth conduit to said steam turbine so that all of the steam generated in this multipressure system is utilized to generate shaft energy in said steam turbine to drive a shaft driven load, G means to add selected quantities of water purifying chemicals to the selected quantity of feedwater being directed exclusively to the deaerator evaporator, to the selected quantity of feedwater being directed exclusively to the low pressure evaporator, and to the selected quantity of feedwater being directed exclusively to the high pressure evaporator, respectively.
Claim 25
Dependent Claim
259 words
a third flow path conduit system directing a third selected quantity of deaerated feedwater from said boiler feed pump exclusively to said high pressure evaporator and including: a. a first conduit connecting said boiler feedwater pump to said low temperature economizer, b. a second conduit connecting said low temperature economizer to said high temperature economizer in which the deaerated feedwater is heated to a temperature above the condensation temperature of said high pressure evaporator, c. a third conduit connecting said high temperature economizer to said high pressure evaporator so that the deaerated feedwater passing through said first and second conduits and said low temperature and high temperature economizers is directed into said high pressure evaporator above the condensation temperature thereof, d. a fourth conduit connecting said high pressure evaporator to said superheater, and e. a fifth conduit connecting said superheater to said steam turbine so that the steam generated in said high pressure evaporator is passed through said fourth conduit to be superheated in passing through said superheater and then directed through said fifth conduit to said steam turbine so that all of the steam generated in this multipressure system is utilized to generate shaft energy in said steam turbine to drive a shaft driven load, G means to add selected quantities of water purifying chemicals to the selected quantity of feedwater being directed exclusively to the deaerator evaporator, to the selected quantity of feedwater being directed exclusively to the low pressure evaporator, and to the selected quantity of feedwater being directed exclusively to the high pressure evaporator, respectively.
Claim 26
Dependent Claim
74 words
A multipressure steam generating powerplant including a heat recovery boiler having: A a heat duct having an upstream end and a downstream end, B a high pressure evaporator having tubes in said heat duct at an upstream station, C a low pressure evaporator having tubes in said heat duct at a downstream station, D first feedwater conduit means connected to provide a selected quantity of feedwater exclusively to said low pressure evaporator and including:
Claim 27
Dependent Claim
74 words
A multipressure steam generating powerplant including a heat recovery boiler having: A a heat duct having an upstream end and a downstream end, B a high pressure evaporator having tubes in said heat duct at an upstream station, C a low pressure evaporator having tubes in said heat duct at a downstream station, D first feedwater conduit means connected to provide a selected quantity of feedwater exclusively to said low pressure evaporator and including:
Claim 28
Dependent Claim
23 words
A powerplant according to claim 4 and including means to deaerate the feedwater to be passed through said first and second conduit means.
Claim 29
Dependent Claim
73 words
A powerplant according to claim 5 wherein said feedwater deaeration means includes: A a deaerator evaporator positioned in said heat duct downstream of said low pressure evaporator, B a fluid-to-fluid deaerator, and C conduits connecting said deaerator to said deaerator evaporator to conduct feedwater from said deaerator to said deaerator evaporator to generate low pressure steAm therein and to conduct said steam back to said deaerator to heat and deaerate the entering feedwater.
Claim 30
Dependent Claim
92 words
A powerplant according to claim 6 and including: A. means located in said first feedwater conduit means to heat the deaerated feedwater passing therethrough to a point at which the deaerated feedwater will heat the low pressure evaporator above the condensation temperature of the waste-heat gas passing thereover, and B. means located in said second feedwater conduit means to heat the deaerated feedwater passing therethrough to a point at which the deaerated feedwater will heat the high pressure evaporator to a temperature above the condensation temperature of the waste-heat gas passing thereover.
Claim 31
Dependent Claim
119 words
A powerplant according to claim 5 wherein said feedwater deaerator includes a fluid-to-fluid deaerator positioned externally of the heat stack and a deaerator evaporator having tubes in said heat stack at a station downstream of said low pressure evaporator and conduit means connecting said deaerator and said deaerator evaporator so that the low pressure steam generated in said deaerator evaporator is directed to said deaerator so as to heat the feedwater entering the deaerator to deaerate the feedwater and so that the saturated mixture of feedwater and steam accumulated in said deaerator after said mixing will be passed in part to said deaerator evaporator, in part to said low pressure evaporator and in part to said high pressure evaporator.
Claim 32
Dependent Claim
68 words
A gas turbine-steam turbine unfired, combined cycle powerplant wherein the exhaust gases of the gas turbine provide all of the heat to the steam boiler to generate steam for the steam turbine which is connected to drive a shaft driven load including: A. a gas turbine engine, B. a steam turbine engine, C. a waste-heat boiler through which the gas turbine engine exhaust gases are passed and including:
Claim 33
Dependent Claim
68 words
A gas turbine-steam turbine unfired, combined cycle powerplant wherein the exhaust gases of the gas turbine provide all of the heat to the steam boiler to generate steam for the steam turbine which is connected to drive a shaft driven load including: A. a gas turbine engine, B. a steam turbine engine, C. a waste-heat boiler through which the gas turbine engine exhaust gases are passed and including:
Claim 34
Dependent Claim
44 words
A powerplant according to claim 9 wherein said third system splits from said second system so that about one-fourth to one-third of the deaerated feedwater enters said low pressure evaporator and about three-fourths to two-thirds of the deaerated feedwater enters said high pressure evaporator.
Claim 35
Dependent Claim
52 words
An unfired, waste-heat-steam turbine combined cycle powerplant wherein waste-heat provides all of the heat to the steam boiler to generate steam for the steam turbine which is connected to drive a shaft driven load including: A. a steam turbine, B. a waste-heat stack boiler through which the waste-heat is passed and including:
Claim 36
Dependent Claim
52 words
An unfired, waste-heat-steam turbine combined cycle powerplant wherein waste-heat provides all of the heat to the steam boiler to generate steam for the steam turbine which is connected to drive a shaft driven load including: A. a steam turbine, B. a waste-heat stack boiler through which the waste-heat is passed and including:
Claim 37
Dependent Claim
145 words
multipressure steam generating powerplant including a heat recovery boiler having: A. a heAt duct having an upstream end and a downstream end, B. a high pressure evaporator having tubes in said heat duct at an upstream station, C. a low pressure evaporator having tubes in said heat duct at a downstream station, D. an intermediate pressure evaporator having tubes in said heat duct at a station between said high pressure evaporator and said low pressure evaporator, E. means to direct a first quantity of deaerated feedwater exclusively to said low pressure evaporator, F. means to direct a second quantity of deaerated feedwater exclusively to said intermediate pressure evaporator, G. means to direct a third quantity of deaerated feedwater exclusively to said high pressure evaporator, and H. means to optimally chemically treat said deaerated feedwater exclusively entering each of said low, intermediate, and high pressure evaporators.
Claim 38
Dependent Claim
145 words
multipressure steam generating powerplant including a heat recovery boiler having: A. a heAt duct having an upstream end and a downstream end, B. a high pressure evaporator having tubes in said heat duct at an upstream station, C. a low pressure evaporator having tubes in said heat duct at a downstream station, D. an intermediate pressure evaporator having tubes in said heat duct at a station between said high pressure evaporator and said low pressure evaporator, E. means to direct a first quantity of deaerated feedwater exclusively to said low pressure evaporator, F. means to direct a second quantity of deaerated feedwater exclusively to said intermediate pressure evaporator, G. means to direct a third quantity of deaerated feedwater exclusively to said high pressure evaporator, and H. means to optimally chemically treat said deaerated feedwater exclusively entering each of said low, intermediate, and high pressure evaporators.
Claim 39
Dependent Claim
149 words
A multipressure steam generating powerplant including a heat recovery boiler having: A. a heat duct having an upstream end and a downstream end, B. a high pressure evaporator having tubes in said heat duct at an upstream station, C. a low pressure evaporator having tubes in said heat duct at a downstream station, D. an intermediate pressure evaporator having tubs in said heat duct at a station between said high pressure evaporator and said low pressure evaporator, E. means to direct a total quantity of deaerated feedwater so that a first portion thereof flows exclusively to said low pressure evaporator, so that a second portion thereof flows exclusively to said intermediate pressure evaporator, and so that the remainder thereof flows exclusively to said high pressure evaporator, and F. means to optimally chemically treat the deaerated feedwater being conducted exclusively into each of said low, intermediate, and high pressure evaporators.
Claim 40
Dependent Claim
149 words
A multipressure steam generating powerplant including a heat recovery boiler having: A. a heat duct having an upstream end and a downstream end, B. a high pressure evaporator having tubes in said heat duct at an upstream station, C. a low pressure evaporator having tubes in said heat duct at a downstream station, D. an intermediate pressure evaporator having tubs in said heat duct at a station between said high pressure evaporator and said low pressure evaporator, E. means to direct a total quantity of deaerated feedwater so that a first portion thereof flows exclusively to said low pressure evaporator, so that a second portion thereof flows exclusively to said intermediate pressure evaporator, and so that the remainder thereof flows exclusively to said high pressure evaporator, and F. means to optimally chemically treat the deaerated feedwater being conducted exclusively into each of said low, intermediate, and high pressure evaporators.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |