GB916173A - Improvements in forced flow once-through vapour generating and vapour heating units - Google Patents
Improvements in forced flow once-through vapour generating and vapour heating unitsInfo
- Publication number
- GB916173A GB916173A GB24370/59A GB2437059A GB916173A GB 916173 A GB916173 A GB 916173A GB 24370/59 A GB24370/59 A GB 24370/59A GB 2437059 A GB2437059 A GB 2437059A GB 916173 A GB916173 A GB 916173A
- Authority
- GB
- United Kingdom
- Prior art keywords
- superheater
- conduit
- tubes
- passes
- steam
- 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
- 238000010438 heat treatment Methods 0.000 title abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 4
- 238000005192 partition Methods 0.000 abstract 3
- 238000001816 cooling Methods 0.000 abstract 2
- 239000000446 fuel Substances 0.000 abstract 2
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 238000010304 firing Methods 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 238000013021 overheating Methods 0.000 abstract 1
- 239000002893 slag Substances 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
Classifications
-
- 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
- F22B29/10—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 sliding point of final state of complete evaporation
-
- 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
- F22B35/14—Control systems for steam boilers for steam boilers of forced-flow type during the starting-up periods, i.e. during the periods between the lighting of the furnaces and the attainment of the normal operating temperature of the steam boilers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
-
- 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
- F22D11/00—Feed-water supply not provided for in other main groups
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Water Supply & Treatment (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
916,173. Forced-flow steam boilers. BABCOCK & WILCOX CO. July 15, 1959 [July 17, 1958], No. 24370/59. Class 123 (2). In a forced flow, once-through boiler operating at high, perhaps supercritical, pressure, provision is made in the event of feed pump stoppage for cooling the heating tubes which would be endangered by overheating due to the residual heat in the setting by producing a thermal circulation of steam and water through those tubes. The supercritical pressure boiler shown is of the kind described in Specification 899,359. It has a tube-lined, upright furnace chamber A fired by pulverized fuel burners 18 and surmounted by a convection gas cooling chamber B which is divided into three passes 22, 23, 24 by tubulous partitions 20, 21. The gas flow through the passes is proportioned by outlet dampers 33, 34, 35. The upper and lower portions of all the passes contain respectively an economizer 32 and a secondary superheater 29 whilst the central portions of the passes respectively contain a final primary superheater 28, a first stage reheater 30 and an initial primary superheater 27 and a second stage reheater 31. A feed pump 46 supplies water through a conduit 42 to the economizers 32 whence it flows through a downcomer 44 and then upwardly in steam generating tubes lining the walls of the chambers A and B to a header 47. From this header steam-water mixture descends in downcomers 48 to enter tubes forming slag screens 25, 26 and the partitions 20, 21 through which it rises to a header 49. From this header steam passes into the initial primary superheater 27, leaving through a conduit 50 for passage through the superheaters 28, 29. A conduit 51 containing a check valve 52 connects the outlet of the pump 46 with the outlet conduit 50 from the superheater 27. The check valve 52 comprises a piston 52A moving in a cylinder 53. In its uppermost position the piston contacts a seating 56 and closes the conduit 51, the piston occupying this position when the generator is working normally since the pump pressure holds it on to the seating. If the feed water supply to the unit fails, the fuel firing equipment is automatically shut off and the piston 52A, no longer supported by the pump pressure, falls to open the conduit 51, whereupon a thermo-syphon circulation is established in a flow path including the economizers 32, the downcomer 44, the wall lining, screen and partition tubes, the superheater 27 and the conduits 51, 42. The generating tubes and superheater 27 which, unlike the secondary superheater and reheater, are not made of high quality steel are thus protected from being overheated by the residual heat of the setting by the natural circulation of working fluid, the heat being transferred thereby to the economizer. Since no heat is lost from the unit it can be restarted without delay when the feed supply is available, the valve 52A being closed manually by a rod 52B.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US749123A US2995119A (en) | 1958-07-17 | 1958-07-17 | Apparatus for shut-down of a forced flow vapor generating unit |
Publications (1)
Publication Number | Publication Date |
---|---|
GB916173A true GB916173A (en) | 1963-01-23 |
Family
ID=25012359
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB24370/59A Expired GB916173A (en) | 1958-07-17 | 1959-07-15 | Improvements in forced flow once-through vapour generating and vapour heating units |
Country Status (2)
Country | Link |
---|---|
US (1) | US2995119A (en) |
GB (1) | GB916173A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3215126A (en) * | 1960-12-19 | 1965-11-02 | Babcock & Wilcox Co | Once-through vapor generator |
CN102269396A (en) * | 2011-05-17 | 2011-12-07 | 上海锅炉厂有限公司 | Arrangement structure of boiler heating surfaces |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2614543A (en) * | 1947-04-01 | 1952-10-21 | James W Hood | Forced circulation boiler |
DE857965C (en) * | 1950-04-07 | 1952-12-04 | Siemens Ag | Device for monitoring the heat supply to a forced flow boiler |
US2901887A (en) * | 1953-10-31 | 1959-09-01 | Sulzer Ag | System for starting and temporarily taking the load off a steam power plant having multistage reheating |
US2849989A (en) * | 1956-05-14 | 1958-09-02 | Vorkauf Heinrich | Hot water boiler for forced circulation heating systems |
-
1958
- 1958-07-17 US US749123A patent/US2995119A/en not_active Expired - Lifetime
-
1959
- 1959-07-15 GB GB24370/59A patent/GB916173A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2995119A (en) | 1961-08-08 |
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