GB768201A - Improvements relating to forced flow once through tubulous vapour generating and superheating units and to the starting of turbines arranged to be supplied with vapour from such units - Google Patents
Improvements relating to forced flow once through tubulous vapour generating and superheating units and to the starting of turbines arranged to be supplied with vapour from such unitsInfo
- Publication number
- GB768201A GB768201A GB8562/55A GB856255A GB768201A GB 768201 A GB768201 A GB 768201A GB 8562/55 A GB8562/55 A GB 8562/55A GB 856255 A GB856255 A GB 856255A GB 768201 A GB768201 A GB 768201A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- steam
- vessel
- water
- units
- 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
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B29/00—Steam boilers of forced-flow type
- F22B29/06—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes
- F22B29/08—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes operating with fixed point of final state of complete evaporation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B29/00—Steam boilers of forced-flow type
- F22B29/06—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes
- F22B29/12—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes operating with superimposed recirculation during starting and low-load periods, e.g. composite boilers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/18—Controlling water feed or water level; Automatic water feeding or water-level regulators for varying the speed or delivery pressure of feed pumps
- F22D5/22—Controlling water feed or water level; Automatic water feeding or water-level regulators for varying the speed or delivery pressure of feed pumps with floats
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
768,201. Forced-flow steam boilers. BABCOCK & WILCOX, Ltd. March 24, 1955 [March 26, 1954], Nos. 8562/55. Class 123(2). A forced-flow, once-through steam boiler comprises serially-connected tube sections viz., a preheater 7, an evaporating section 8, a transition section 9, a primary superheater 10 and a secondary superheater 12, each section being composed of several parallel tubes, only one of which is shown in the Figure. The preheater inlet header 16 is supplied with water through a feed regulating valve 6 and pipes 4, 5 by a pump 3. A separator 11 is arranged in each parallel tube between superheaters 10, 12 to remove water from steam when individual tubes of the transition zone 9 and super heater 10 are being flushed, each separator being connected by pipes 22, 23 to a common collector vessel 21. The final outlet header 20 is connected by a pipe 13 to a turbine 15, variations in the steam pressure in the pipe 13 acting through control means 47, 48 to regulate the feed valve 6. When the turbine is being started, initially only about 5 per cent of the full load steam output is passed therethrough so as to limit heat stresses in the turbine: Under this condition, to ensure adequate flow velocities in the heated tubes of the boiler without the use of an auxiliary starting condenser, a temporary return flow circulation is established through the heated tubes, a circulating pump 25 drawing water from the vessel 21 and delivering it through line 26 and non-return valve 27 to the tube system. A constantlevel is maintained in the vessel 21 by passing cold feed water through a heat exchange coil 34 in the vessel, the flow of feed water, which is controlled according to the level by a valve 35 actuated by a float 36, determining the amount of steam which is condensed in the vessel and hence the level therein. The head exerted by pump 25 is such that as soon as the boiler load increases to that at which adequate flow velocity occurs in sections 7 .. 10, the valve 27 closes and an interlocked valve 28 opens. Pump 25 then delivers water through pipe 29 and individual pipes 31 fitted with non-return valves 32 to respective tubes of superheater 10 in such quantity that slight superheating occurs at the superheater outlet. With further increase in load the valves 32 close and the boiler then operates normally.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8562/55A GB768201A (en) | 1955-03-24 | 1955-03-24 | Improvements relating to forced flow once through tubulous vapour generating and superheating units and to the starting of turbines arranged to be supplied with vapour from such units |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8562/55A GB768201A (en) | 1955-03-24 | 1955-03-24 | Improvements relating to forced flow once through tubulous vapour generating and superheating units and to the starting of turbines arranged to be supplied with vapour from such units |
Publications (1)
Publication Number | Publication Date |
---|---|
GB768201A true GB768201A (en) | 1957-02-13 |
Family
ID=6673646
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8562/55A Expired GB768201A (en) | 1955-03-24 | 1955-03-24 | Improvements relating to forced flow once through tubulous vapour generating and superheating units and to the starting of turbines arranged to be supplied with vapour from such units |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB768201A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3162179A (en) * | 1962-12-05 | 1964-12-22 | Gilbert Associates | Fluid circulation system for a oncethrough type steam generator |
US3187727A (en) * | 1961-07-27 | 1965-06-08 | Combustion Eng | Steam generator |
US3194218A (en) * | 1963-03-25 | 1965-07-13 | Combustion Eng | Apparatus and method for starting forced flow once-through steam generating power plant |
US3194020A (en) * | 1963-03-25 | 1965-07-13 | Combustion Eng | Method and apparatus relating to vapor generation |
US3212477A (en) * | 1963-09-05 | 1965-10-19 | Combustion Eng | Forced flow steam generator and method of starting same |
US3213835A (en) * | 1961-07-27 | 1965-10-26 | Combustion Eng | Recirculating system having partial bypass around the center wall |
US3255735A (en) * | 1963-12-27 | 1966-06-14 | Babcock & Wilcox Ltd | Once-through, forced-flow boilers |
US4205633A (en) * | 1977-08-05 | 1980-06-03 | Kraftwerk Union Aktiengesellschaft | Device for separating water and steam in a once-through steam generator |
FR2500910A1 (en) * | 1981-02-27 | 1982-09-03 | Westinghouse Electric Corp | CIRCUIT FOR GENERATING WATER VAPOR WITH LOW CONCENTRATION OF CHEMICALS |
EP0308728A1 (en) * | 1987-09-21 | 1989-03-29 | Siemens Aktiengesellschaft | Method of operating a once-through steam generator |
WO1994018498A1 (en) * | 1993-02-09 | 1994-08-18 | L. & C. Steinmüller Gmbh | Steam generating process in a forced flow-through boiler |
-
1955
- 1955-03-24 GB GB8562/55A patent/GB768201A/en not_active Expired
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3187727A (en) * | 1961-07-27 | 1965-06-08 | Combustion Eng | Steam generator |
US3213835A (en) * | 1961-07-27 | 1965-10-26 | Combustion Eng | Recirculating system having partial bypass around the center wall |
US3162179A (en) * | 1962-12-05 | 1964-12-22 | Gilbert Associates | Fluid circulation system for a oncethrough type steam generator |
US3194218A (en) * | 1963-03-25 | 1965-07-13 | Combustion Eng | Apparatus and method for starting forced flow once-through steam generating power plant |
US3194020A (en) * | 1963-03-25 | 1965-07-13 | Combustion Eng | Method and apparatus relating to vapor generation |
US3212477A (en) * | 1963-09-05 | 1965-10-19 | Combustion Eng | Forced flow steam generator and method of starting same |
US3255735A (en) * | 1963-12-27 | 1966-06-14 | Babcock & Wilcox Ltd | Once-through, forced-flow boilers |
US4205633A (en) * | 1977-08-05 | 1980-06-03 | Kraftwerk Union Aktiengesellschaft | Device for separating water and steam in a once-through steam generator |
FR2500910A1 (en) * | 1981-02-27 | 1982-09-03 | Westinghouse Electric Corp | CIRCUIT FOR GENERATING WATER VAPOR WITH LOW CONCENTRATION OF CHEMICALS |
EP0308728A1 (en) * | 1987-09-21 | 1989-03-29 | Siemens Aktiengesellschaft | Method of operating a once-through steam generator |
US4869210A (en) * | 1987-09-21 | 1989-09-26 | Siemens Aktiengesellschaft | Method of operating a once-through steam generator |
WO1994018498A1 (en) * | 1993-02-09 | 1994-08-18 | L. & C. Steinmüller Gmbh | Steam generating process in a forced flow-through boiler |
US5588400A (en) * | 1993-02-09 | 1996-12-31 | L. & C. Steinmuller Gmbh | Method of generating steam in a forced-through-flow boiler |
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