GB793341A - Improvements in or relating to apparatus for regulating a forced-flow, once-through boiler - Google Patents
Improvements in or relating to apparatus for regulating a forced-flow, once-through boilerInfo
- Publication number
- GB793341A GB793341A GB1994356A GB1994356A GB793341A GB 793341 A GB793341 A GB 793341A GB 1994356 A GB1994356 A GB 1994356A GB 1994356 A GB1994356 A GB 1994356A GB 793341 A GB793341 A GB 793341A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- boiler
- steam
- water
- superheater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/06—Control systems for steam boilers for steam boilers of forced-flow type
- F22B35/10—Control systems for steam boilers for steam boilers of forced-flow type of once-through type
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
793,341. Forced-flow steam boilers; controlling superheat. SIEMENS-SCHUCKERTWERKE AKT.-GES. June 27, 1956, No. 19943/56. Classes 123(2) and 123(3) A forced-flow, once-through steam-boiler comprising an evaporating section from which steam flows through successive superheaters 1, 2 to a turbine 4 driving a generator G is regulated under sharplychanging loads by variation of the firing rate and of the settings of the main feedwater valve 9, of a valve E1 which controls the amount of water injected into the boiler tubing at a point e1 between the superheaters 1, 2 and a valve E2 which controls the amount of water inpected at e2 between the evaporating section and the superheater 1. The setting of the valve E2 is controlled according to changes in boiler load, whilst valve E1 is controlled through a regulator device f according to changes in steam temperature measured at points t2, t3 located respectively before and after the superheater 2. If, for example, the demand on the generator G suddenly increases, the main turbine regulator h causes a valve 3 to open to admit more steam to the turbine. Impulses r, x representative of steam pressure variation and generator output respectively are transmitted through a boiler load setting device g to regulating devices, a, b, c which respectively effect appropriate increases in the amounts of air, feedwater and fuel fed to the boiler. To satisfy the demand for extra steam during the time when the increased supply is traversing the evaporating tubes, and thus to avoid a temporary drop in pressure at the boiler outlet, the load setting device g also causes the valve E2 to open further to admit an increased quantity of water to the superheater 1 wherein it evaporates by adsorption of heat from the tube system to supply the extra steam required. The resulting reduction in steam temperature is offset by the closing of the valve E1 to reduce the amount of water injected at the point e1. When the increased quantity of feed- - water has advanced to the injection point e2, a time delay element Z3 cancels the control order to the valve E2 and the boiler operates normally at the higher load.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1994356A GB793341A (en) | 1956-06-27 | 1956-06-27 | Improvements in or relating to apparatus for regulating a forced-flow, once-through boiler |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1994356A GB793341A (en) | 1956-06-27 | 1956-06-27 | Improvements in or relating to apparatus for regulating a forced-flow, once-through boiler |
Publications (1)
Publication Number | Publication Date |
---|---|
GB793341A true GB793341A (en) | 1958-04-16 |
Family
ID=10137716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1994356A Expired GB793341A (en) | 1956-06-27 | 1956-06-27 | Improvements in or relating to apparatus for regulating a forced-flow, once-through boiler |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB793341A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3096744A (en) * | 1958-12-23 | 1963-07-09 | Sulzer Ag | Method of and apparatus for regulating the steam temperature in a steam generator |
-
1956
- 1956-06-27 GB GB1994356A patent/GB793341A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3096744A (en) * | 1958-12-23 | 1963-07-09 | Sulzer Ag | Method of and apparatus for regulating the steam temperature in a steam generator |
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