GB1008795A - - Google Patents
Info
- Publication number
- GB1008795A GB1008795A GB2903462A GB2903462A GB1008795A GB 1008795 A GB1008795 A GB 1008795A GB 2903462 A GB2903462 A GB 2903462A GB 2903462 A GB2903462 A GB 2903462A GB 1008795 A GB1008795 A GB 1008795A
- Authority
- GB
- United Kingdom
- Prior art keywords
- recirculation
- pump
- flow
- load
- water wall
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 5
- 238000002485 combustion reaction Methods 0.000 abstract 3
- 238000011144 upstream manufacturing Methods 0.000 abstract 2
- 230000007423 decrease Effects 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010304 firing Methods 0.000 abstract 1
- 239000003546 flue gas Substances 0.000 abstract 1
- 238000002955 isolation Methods 0.000 abstract 1
- 238000005192 partition Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000003303 reheating Methods 0.000 abstract 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/02—Applications of combustion-control devices, e.g. tangential-firing burners, tilting burners
-
- 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
- F22B29/02—Steam boilers of forced-flow type of forced-circulation type
- F22B29/023—Steam boilers of forced-flow type of forced-circulation type without drums, i.e. without hot water storage in the boiler
- F22B29/026—Steam boilers of forced-flow type of forced-circulation type without drums, i.e. without hot water storage in the boiler operating at critical or supercritical pressure
-
- 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
- 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
- F22B35/12—Control systems for steam boilers for steam boilers of forced-flow type of once-through type operating at critical or supercritical pressure
- F22B35/125—Control systems for steam boilers for steam boilers of forced-flow type of once-through type operating at critical or supercritical pressure operating with superimposed recirculation during starting or low load periods, e.g. composite boilers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/06—Controlling superheat temperature by recirculating flue gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/10—Controlling superheat temperature by displacing superheater sections
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
1,008,795. Forced flow steam boilers. SULZER FRERES S.A. July 27, 1962 [July 27, 1961 (3)], No. 29034/62. Heading F4A. A forced-flow, once-through supercritical pressure vapour generator has centre wall tubes 12 disposed as a partition in the combustion chamber 32 connected in series with and upstream of furnace lining water wall tubes 14. Below a certain part load a recirculation pump 10 draws working medium from an outlet leader 18 to which the water wall tubes 14 discharge, for recirculation through the centre wall and water wall tubes 12, 14 in order to prevent burning of the tubes by maintaining a certain minimum flow therethrough. Fresh feed from a feed pump 22 mixes with the recirculation flow in a mixing vessel 20. The pump 10 is driven at constant speed and its delivery is regulated only by the pressure conditions prevailing in the system and by its own pressure characteristics; these are such that with increasing through-flow circulation decreases and ceases altogether at a certain part load. Above this load a check valve 88 prevents reverse flow through the pump and recirculation line 60. The pump 10 may be installed in the throughflow part of the system upstream of the centre wall and water wall sections, Fig. 9 (not shown), between these sections, Fig. 12 (not shown) or downstream of the water wall section, Fig. 13 (not shown). A second pump may be provided in parallel with the pump 10, Fig. 14 (not shown) and valves may be provided to allow flow through both these pumps above the load at which recirculation ceases or for isolation purposes. Where the vapour generator is provided with a convection heated reheating surface there is a tendency for the reheat temperature to fall with decreasing load and this tendency is partly offset by the recirculation of working medium. To provide further control of the reheat temperature the recirculation of working medium may be combined with recirculation of the flue gases, Fig. 16 (not shown) or with positioning of the combustion zone within the combustion chamber by means of tilting burners, Fig. 18 (not shown) or by means of varying the firing of vertically spaced burners. Specifications 552,747, 598,141, 768,201, 831,175, 1,008;791 and 1,008,793 are referred to.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US127395A US3135252A (en) | 1961-07-27 | 1961-07-27 | Recirculation system for steam generator |
| US127176A US3202138A (en) | 1961-07-27 | 1961-07-27 | Vapor temperature control method |
| US127289A US3135250A (en) | 1961-07-27 | 1961-07-27 | Steam generator utilizing a recirculating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1008795A true GB1008795A (en) | 1965-11-03 |
Family
ID=27383538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2903462A Expired GB1008795A (en) | 1961-07-27 | 1962-07-27 |
Country Status (2)
| Country | Link |
|---|---|
| ES (1) | ES279529A1 (en) |
| GB (1) | GB1008795A (en) |
-
1962
- 1962-07-26 ES ES0279529A patent/ES279529A1/en not_active Expired
- 1962-07-27 GB GB2903462A patent/GB1008795A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES279529A1 (en) | 1962-12-01 |
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