US4520762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forced through-flow steam generator
Assignee: DEUTSCHE BOBCOCK WERKE AKTIENGESEESCHAFT DUISBURGER STRASSE 375 4200 OBERHAUSEN 1 W GERMANY
•
Filing: 1983-09-12
•
Granted: 1985-06-04
•
Expires: 2003-09-12
Abstract
Abstract An economizer is connected to the highest point of the evaporator by an evaporation pipe provided with a valve, in order to operate a forced flow-through steam generator at low costs. During re-filling of the economizer with a small quantity of feed water, the steam formed during shutdown due to stored heat, can escape into the vapor space above the water level when the valves are open.
Inventors
- 👤 Heino Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:10
CPC Classifications
F; F22; F22B; F22B29/00; F22B29/06; F22B29/12; F22D; F22D1/00; F22D1/02; F22D1/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
137 words
Forced flow-through steam generator comprising: feed water pump, economizer, evaporator, and water separator having a vapor space above its water level connected in series; a circulation pipe connected to a water outlet of said water separator; said economizer being located at a level higher than an inlet of said evaporator; evaporation pipe means with valve means, exit means of said economizer being connected by said evaporation pipe means to the highest point of said evaporator, during filling the steam generator with water, water pressing steam bubbles into said vapor space above the water level by said evaporation pipe means to fill the steam generator with a substantially small quantity of feed charging water without vapor remaining in said economizer for preventing pressure reduction in the steam generator occurring when charging with a substantially large quantity of water.
Claim 2
Dependent Claim
137 words
Forced flow-through steam generator comprising: feed water pump, economizer, evaporator, and water separator having a vapor space above its water level connected in series; a circulation pipe connected to a water outlet of said water separator; said economizer being located at a level higher than an inlet of said evaporator; evaporation pipe means with valve means, exit means of said economizer being connected by said evaporation pipe means to the highest point of said evaporator, during filling the steam generator with water, water pressing steam bubbles into said vapor space above the water level by said evaporation pipe means to fill the steam generator with a substantially small quantity of feed charging water without vapor remaining in said economizer for preventing pressure reduction in the steam generator occurring when charging with a substantially large quantity of water.
Claim 3
Dependent Claim
46 words
Forced flow-through steam generator according to claim 1, including temperature sensor means in said evaporation pipe means and coupled to said valve means so that said valve means is in closed position when a predetermined difference exists between medium temperature in said economizer and boiling temperature.
Claim 4
Dependent Claim
19 words
Forced flow-through steam generator according to claim 1, wherein said circulation pipe terminates between said economizer and said evaporator.
Claim 5
Dependent Claim
138 words
Forced flow-through steam generator comprising: feed water pump, economizer, evaporator, and water separator having a vapor space above its water level connected in series; a circulation pipe connected to a water outlet of said water separator; said economizer being located at a level higher than an inlet of said evaporator; evaporation pipe means with valve means, exit means of said economizer being connected by said evaporation pipe means to the vapor space of said water separator, during filling the steam generator with water, water pressing steam bubbles into said vapor space above the water level by said evaporation pipe means to fill the steam generator with a substantially small quantity of feed charging water without vapor remaining in said economizer for preventing pressure reduction in the steam generator occurring when charging with a substantially large quantity of water.
Claim 6
Dependent Claim
138 words
Forced flow-through steam generator comprising: feed water pump, economizer, evaporator, and water separator having a vapor space above its water level connected in series; a circulation pipe connected to a water outlet of said water separator; said economizer being located at a level higher than an inlet of said evaporator; evaporation pipe means with valve means, exit means of said economizer being connected by said evaporation pipe means to the vapor space of said water separator, during filling the steam generator with water, water pressing steam bubbles into said vapor space above the water level by said evaporation pipe means to fill the steam generator with a substantially small quantity of feed charging water without vapor remaining in said economizer for preventing pressure reduction in the steam generator occurring when charging with a substantially large quantity of water.
Claim 7
Dependent Claim
145 words
Forced flow-through steam generator comprising: feed water pump, economizer, evaporator, and water level flask having a vapor space above its water level connected in series; a circulation pipe connected to a water outlet of said water separator; said economizer being located at a level higher than an inlet of said evaporator; evaporation pipe means with valve means, exit means of said economizer being connected by said evaporation pipe means to the vapor space of said water level flask, during filling the steam generator with water, water pressing steam bubbles into said vapor space above the water level by said evaporation pipe means to fill the steam generator with a substantially small quantity of feed charging water without vapor remaining in said economizer for preventing pressure reduction in the steam generator occurring in the steam generator occurring when charging with a substantially large quantity of water.
Claim 8
Dependent Claim
145 words
Forced flow-through steam generator comprising: feed water pump, economizer, evaporator, and water level flask having a vapor space above its water level connected in series; a circulation pipe connected to a water outlet of said water separator; said economizer being located at a level higher than an inlet of said evaporator; evaporation pipe means with valve means, exit means of said economizer being connected by said evaporation pipe means to the vapor space of said water level flask, during filling the steam generator with water, water pressing steam bubbles into said vapor space above the water level by said evaporation pipe means to fill the steam generator with a substantially small quantity of feed charging water without vapor remaining in said economizer for preventing pressure reduction in the steam generator occurring in the steam generator occurring when charging with a substantially large quantity of water.
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) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |