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Patent US3601382A successfully refreshed from Google Patents.
US3601382A
Expired / Lapsed
US
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Method and apparatus for avoiding of evaporation
Assignee: Waagner Biro AG
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Filing: 1969-01-15
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Granted: 1971-08-24
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Expires: 1989-01-15
Abstract
Abstract A method and apparatus for preventing the vaporization of a cooling liquid used in a boiler which is heated by waste gases from a converter. A circulating pump pumps a constant amount of cooling liquid through a system which includes in addition to the boiler and the pump a heat exchanger in which the liquid is cooled after leaving the boiler and a reservoir which receives the cooled liquid from the heat exchanger and which supplies the liquid to the circulating pump. A compensating or equalizing expansion tank communicates with the reservoir and maintains over a liquid which is in this latter tank a cushion of a noncorrosive gas. As the temperature of the liquid rises, the pressure of the gas in this cushion also rises, so that the pressure of the liquid rises, thus raising the boiling point thereof in such a way as to prevent vaporizing of the liquid. The liquid is continuously circulated during the off-blow as well as during the blow periods of each cycle, so that by the time the end of an off-blow has been reached, the cooling liquid has been cooled down to the temperature which it had initially at the beginning of the blow period.
Inventors
- 👤 Alfred Sandri
- 👤 Anton Scherleitner
- 👤 Stefan Ivessa
- 👤 Karl Nutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:32
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/38; C21C5/40; F; F28; F28F; F28F2265/00; F28F2265/12; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
184 words
In a method of absorbing heat into a cooling liquid in an installation where intermittent heatinG takes place, such as a steel converter installation where each operating cycle has a blow period followed by an off-blow period, the steps of directing hot gases through a passage around which cooling pipes are distributed for conveying along the passage the cooling liquid which is heated by the hot gases, situating the cooling liquid in a circuit which includes a heat exchanger for cooling the cooling liquid for extracting heat therefrom and a gas cushion the pressure of which increases during an increase in the temperature and volume of the cooling liquid so that the pressure of the liquid increases as its temperature increases to raise its boiling point, and continuously circulating the liquid at a given rate through the circuit during the off-blow period of each cycle as well as during the blow period thereof to return the liquid substantially to the initial temperature which it had at the beginning of a blow period of each cycle, whereby vaporizing of the circulating cooling liquid is prevented.
Claim 2
Dependent Claim
184 words
In a method of absorbing heat into a cooling liquid in an installation where intermittent heatinG takes place, such as a steel converter installation where each operating cycle has a blow period followed by an off-blow period, the steps of directing hot gases through a passage around which cooling pipes are distributed for conveying along the passage the cooling liquid which is heated by the hot gases, situating the cooling liquid in a circuit which includes a heat exchanger for cooling the cooling liquid for extracting heat therefrom and a gas cushion the pressure of which increases during an increase in the temperature and volume of the cooling liquid so that the pressure of the liquid increases as its temperature increases to raise its boiling point, and continuously circulating the liquid at a given rate through the circuit during the off-blow period of each cycle as well as during the blow period thereof to return the liquid substantially to the initial temperature which it had at the beginning of a blow period of each cycle, whereby vaporizing of the circulating cooling liquid is prevented.
Claim 3
Dependent Claim
59 words
In a method as recited in claim 1, and including, when more than average heat is transferred to the cooling liquid, the steps of removing part of the heated cooling liquid from the circuit while the cooling liquid still has not vaporized, and replacing the removed part of the cooling liquid with additional cooling liquid at a lower temperature.
Claim 4
Dependent Claim
60 words
In a method as recited in claim 1, and wherein the cooling liquid is circulated from a reservoir through the pipes around said passage, and is cooled by the heat exchanger before returning to the reservoir, while liquid expanding out of the reservoir by the increasing volume of the heated cooling liquid is maintained in engagement with the gas cushion.
Claim 5
Dependent Claim
27 words
In a method as recited in claim 3, and wherein the pressure of the cooling liquid in engagement with the gas cushion is maintained within predetermined limits.
Claim 6
Dependent Claim
62 words
In a method as recited in claim 1, and wherein the amount of cooling liquid which is constantly circulated is selected as a function of the highest temperature of the cooling liquid when the latter discharges from the pipes distributed about said passage, in such a way that vaporization of the cooling liquid cannot take place at any part of the circuit.
Claim 7
Dependent Claim
67 words
In a method as recited in claim 1 and wherein flow of gas to and from the gas cushion is controlled according to the pressure of the gas at a given upper level of the cooling liquid in a tank beneath the gas, while the feeding of additional cooling liquid into the tank is automatically controlled according to the lowest level of the liquid in the tank.
Claim 8
Dependent Claim
23 words
In a method as recited in claim 1 and wherein the gas of the gas cushion is a noncorrosive gas such as nitrogen.
Claim 9
Dependent Claim
143 words
In an installation where intermittent heating occurs, such as a steel converter installation having blow and off-blow periods, a cooling circuit means for directing a cooling liquid along a path where waste gas from the heating installation flows to absorb heat from the waste gas and to give up heat at a part of the cooling circuit means, a compensating tank communicating with said cooling circuit means and enclosing part of the cooling liquid and a gas cushion situated thereover in the tank, so that as the temperature of the cooling liquid rises its volume increases and the pressure of the gas cushion rises to raise the pressure of the cooling liquid and thus raise its boiling point, and a pair of supply means respectively communicating with the gas and liquid in the compensating tank for respectively supplying gas and cooling liquid thereto.
Claim 10
Dependent Claim
143 words
In an installation where intermittent heating occurs, such as a steel converter installation having blow and off-blow periods, a cooling circuit means for directing a cooling liquid along a path where waste gas from the heating installation flows to absorb heat from the waste gas and to give up heat at a part of the cooling circuit means, a compensating tank communicating with said cooling circuit means and enclosing part of the cooling liquid and a gas cushion situated thereover in the tank, so that as the temperature of the cooling liquid rises its volume increases and the pressure of the gas cushion rises to raise the pressure of the cooling liquid and thus raise its boiling point, and a pair of supply means respectively communicating with the gas and liquid in the compensating tank for respectively supplying gas and cooling liquid thereto.
Claim 11
Dependent Claim
92 words
The combination of claim 8 and wherein said cooling circuit means includes a circulating pump, cooling tubes provided with cooling liquid by said circulating pump and situated around a path of flow of the waste gas to receive heat therefrom, a heat-exchanger means communicating with said tubes for receiving the heated cooling liquid therefrom and cooling the cooling liquid, a reservoir communicating with said heat-exchanger means for receiving thE cooled liquid therefrom and also communicating with said circulating pump for supplying cooled liquid thereto, and said compensating tank communicating with said reservoir.
Claim 12
Dependent Claim
53 words
The combination of claim 9 and wherein a feed pump communicates with said tank for feeding cooling liquid thereto, and control means responding to the level of cooling liquid in said tank and operatively connected with said feed pump for actuating the latter as a function of the liquid level in said tank.
Claim 13
Dependent Claim
70 words
The combination of claim 9 and wherein a gas flow control means communicates with the gas cushion for controlling the flow of gas to and from the latter, and control means operatively connected with said gas flow control means and responding automatically to the level of cooling liquid in the tank for withdrawing or supplying the gas to the gas cushion when the liquid level reaches a given upper limit.
References Cited (Backward Citations)
US3214153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |