US5320070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for using excess heat not required for operating a desulfurization device
Assignee: Babcock Borsig Service GmbH
•
Filing: 1992-08-27
•
Granted: 1994-06-14
•
Expires: 2012-08-27
Abstract
Abstract A method and a device for using excess heat of flue gas that is not required for operating a flue gas desulfurization device of a power plant is presented. Before being introduced into the flue gas desulfurization device. The flue gas is guided through preheaters for heating the combustion air and an electrostatic filter. The combustion air preheating step is achieved with two air preheaters, one arranged upstream of the electrostatic filter and one arranged downstream of the electrostatic filter. A partial flue gas stream is branched off at least before the first air preheater arranged upstream of the electrostatic filter. The partial flue gas stream is used to generate steam.
Inventors
- 👤 Martin Kienbock
- 👤 Manfred Kehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:48
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/343
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
148 words
A method for using excess heat of flue gas, said excess heat not required for operating a flue gas desulfurization device of a power plant, said method comprising the steps of: guiding the flue gas through a main flue gas line into an electrostatic filter before introducing the flue gas into the flue gas desulfurization device; guiding the flue gas through a first and a second air preheater before introducing the flue gas into the flue gas desulfurization device; arranging said first and said second air preheaters upstream and optionally downstream of said electrostatic filter in the main flue gas line; branching off a partial flue gas stream at least before one of said first and second air preheaters that is arranged upstream of said electrostatic filter, said partial flue gas stream corresponding approximately to said excess heat; and using said partial flue gas stream for generating steam.
Claim 2
Independent Claim
148 words
A method for using excess heat of flue gas, said excess heat not required for operating a flue gas desulfurization device of a power plant, said method comprising the steps of: guiding the flue gas through a main flue gas line into an electrostatic filter before introducing the flue gas into the flue gas desulfurization device; guiding the flue gas through a first and a second air preheater before introducing the flue gas into the flue gas desulfurization device; arranging said first and said second air preheaters upstream and optionally downstream of said electrostatic filter in the main flue gas line; branching off a partial flue gas stream at least before one of said first and second air preheaters that is arranged upstream of said electrostatic filter, said partial flue gas stream corresponding approximately to said excess heat; and using said partial flue gas stream for generating steam.
Claim 3
Dependent Claim
39 words
A method according to claim 1, further comprising the step of branching off a further partial flue gas stream corresponding approximately to said excess heat at the other one of said first and said second preheaters for generating steam.
Claim 4
Dependent Claim
16 words
A method according to claim 1, further comprising the step of using the steam for heating.
Claim 5
Dependent Claim
21 words
A method according to claim 1, further comprising the step of introducing the steam into the turbine of the power plant.
Claim 6
Dependent Claim
23 words
A method according to claim 1, further comprising the steps of: providing an auxiliary turbine; and introducing the steam into said auxiliary turbine.
Claim 7
Dependent Claim
15 words
A method according to claim 5, wherein said auxiliary turbine is a dual pressure turbine.
Claim 8
Independent Claim
124 words
A device for using excess heat of flue gas, said excess heat not required for operating a flue gas desulfurization device of a power plant, said device comprising: a main flue gas line connected to the desulfurization device; an electrostatic filter connected upstream of the desulfurization device within said main flue gas line; a first air preheater connected upstream of said electrostatic filter within said main flue gas line and a second air preheater connected downstream of said electrostatic filter and upstream of the desulfurization device within said main flue gas line; and a first bypass line connected upstream of said first air preheater to said main flue gas line for branching off a partial flue gas stream corresponding approximately to said excess heat.
Claim 9
Independent Claim
124 words
A device for using excess heat of flue gas, said excess heat not required for operating a flue gas desulfurization device of a power plant, said device comprising: a main flue gas line connected to the desulfurization device; an electrostatic filter connected upstream of the desulfurization device within said main flue gas line; a first air preheater connected upstream of said electrostatic filter within said main flue gas line and a second air preheater connected downstream of said electrostatic filter and upstream of the desulfurization device within said main flue gas line; and a first bypass line connected upstream of said first air preheater to said main flue gas line for branching off a partial flue gas stream corresponding approximately to said excess heat.
Claim 10
Dependent Claim
16 words
A device according to claim 7, further comprising a control valve within said first bypass line.
Claim 11
Dependent Claim
56 words
A device according to claim 7, wherein said second preheater further comprises: a heat-receiving part and a heat-dissipating part, said heat-receiving part connected to said main flue gas line and said heat-dissipating part connected to a combustion air line of the power plant; and pipelines connecting said heat-receiving part and said heat-dissipating part to one another.
Claim 12
Dependent Claim
17 words
A device according to claim 9, further comprising a steam-heated auxiliary heat exchanger connected to said pipelines.
Claim 13
Dependent Claim
17 words
A device according to claim 7, wherein said partial flue gas stream is used for generating steam.
Claim 14
Dependent Claim
13 words
A device according to claim 11, wherein the steam is used for heating.
Claim 15
Dependent Claim
18 words
A device according to claim 11, wherein the steam is introduced into a turbine of the power plant.
Claim 16
Dependent Claim
21 words
A device according to claim 11, further comprising an auxiliary turbine and wherein the steam is introduced into said auxiliary turbine.
Claim 17
Dependent Claim
15 words
A device according to claim 14, wherein said auxiliary turbine is a dual pressure turbine.
Claim 18
Dependent Claim
39 words
A device according to claim 7, further comprising a second bypass line connected upstream of said second preheater within said main flue gas line for branching off a further partial flue gas stream corresponding approximately to said excess heat.
Claim 19
Dependent Claim
27 words
A device according to claim 16, further comprising a first control valve within said first bypass line and a second control valve within said second bypass line.
Claim 20
Dependent Claim
57 words
A device according to claim 16, further comprising a first steam generator, coordinated with a first steam super heater, connected within said first bypass line and a second steam generator, coordinated with a second steam super heater, connected within said second bypass line, said first and said second steam super heaters connected within said first bypass line.
Claim 21
Dependent Claim
17 words
A device according to claim 16, wherein said partial flue gas streams are used for generating steam.
Claim 22
Dependent Claim
13 words
A device according to claim 19, wherein the steam is used for heating.
Claim 23
Dependent Claim
18 words
A device according to claim 20, wherein the steam is introduced into a turbine of the power plant.
Claim 24
Dependent Claim
21 words
A device according to claim 19, further comprising an auxiliary turbine and wherein the steam is introduced into said auxiliary turbine.
Claim 25
Dependent Claim
15 words
A device according to claim 22, wherein said auxiliary turbine is a dual pressure turbine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-06-13 | 1997-12-13 | 1998-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-13 | 2001-12-13 | 2002-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-13 | 2005-12-13 | 2006-06-14 | $7700.00 | Window Closed / Lapsed |