EP0456702A1 - Method of controlling a pfbc power plant and a pfbc power plant with equipment for such control - Google Patents
Method of controlling a pfbc power plant and a pfbc power plant with equipment for such controlInfo
- Publication number
- EP0456702A1 EP0456702A1 EP19900902709 EP90902709A EP0456702A1 EP 0456702 A1 EP0456702 A1 EP 0456702A1 EP 19900902709 EP19900902709 EP 19900902709 EP 90902709 A EP90902709 A EP 90902709A EP 0456702 A1 EP0456702 A1 EP 0456702A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steam
- combustor
- gas turbine
- pressure
- bed
- 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.)
- Ceased
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/061—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with combustion in a fluidised bed
- F01K23/062—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with combustion in a fluidised bed the combustion bed being pressurised
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K21/00—Steam engine plants not otherwise provided for
- F01K21/04—Steam engine plants not otherwise provided for using mixtures of steam and gas; Plants generating or heating steam by bringing water or steam into direct contact with hot gas
- F01K21/047—Steam engine plants not otherwise provided for using mixtures of steam and gas; Plants generating or heating steam by bringing water or steam into direct contact with hot gas having at least one combustion gas turbine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
- F02C3/205—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products in a fluidised-bed combustor
Definitions
- the present invention relates to a method of increasing the total efficiency of a PFBC power plant with a gas turbine cycle and a steam turbine cycle by the injection of steam into the combustor of the plant. Further, the invention relates to a PFBC power plant for application of the above- mentioned method.
- the total efficiency is increased by utilizing low grade heat in a PFBC power plant for generation of steam which is injected into the bed vessel and increases the mass flow through the gas turbine cycle and hence the gas turbine power.
- waste gases from the gas turbine are utilized for generation of this steam, but also other low grade heat within the power plant can be utilized.
- the steam is generated in a steam . generator or waste heat boiler separate from the steam turbine cycle. This boiler is supplied with waste gases with such a temperature that the steam which is generated attains a pressure which exceeds the working pressure in the combustor so that it can be injected directly into the combustor.
- the steam pressure is, however, considerably lower than the steam pressure in the steam cycle.
- the object of the invention is primarily to utilize the heat contents of waste gases from a gas turbine in a more efficient way than before. Instead of utilizing the entire heat quantity in the waste gases from the gas turbine in the steam cycle only for feedwater preheating, intermediate superheating of steam, etc., only part of the heat quantity is used for increasing the power in the steam turbine cycle.
- the waste gases are first utilized in a high temperature heat exchanger, for example for preheating of feedwater, and then in a steam boiler for generation of the steam which is injected into the combustion bed such that the increased mass flow through the gas turbine increases the power generated in the gas turbine cycle.
- the temperature of the low grade source of heat must be so high that steam with a pressure suitable for injection, about 20 bar, is obtained.
- the injected steam takes up energy from the bed.
- the steam injection results in the steam generation in the bed tubes, and hence the steam flow in the steam turbine cycle, being reduced.
- an increase of efficiency and of electric power in the plant is obtained by ensuring that the power increase in the gas turbine cycle is greater than the power reduction in the steam cycle.
- 10 designates a combustor with combustion of a fuel, say coal, in a fluidized bed 12.
- the combustor 10 and a cleaning plant for separation of dust in the combustion gases, symbolized by a cyclone 14, are contained within a pressure vessel 16 and surrounded by compressed combustion air in the space 18 between the pressure vessel 16 and the combustor 10 and the cyclone 14.
- Fuel is supplied to the bed 12 of the combustor 10 through the inlet conduit 20.
- the combustor 10 is supplied with air from the space 18 via an air distributing bottom 22 with nozzles 24.
- the combustion gases are collected in the freeboard 26 and are passed, after cleaning in the cyclone 14, through the conduit 28 to a gas turbine 30.
- the gas turbine may be of single-shaft design as in the figure, or or two-shaft design in which case one shaft drives the compressor 32 and the other shaft drives the generator 34.
- the compressor 32 is provided with an intermediate cooler 36. Heat from this cooler can be utilized for preheating feedwater.
- the combustor 10 accomodates nests of boiler tubes 38 and 40 for cooling of the bed and for generation and superheating of steam and intermediate superheating of steam, respectively.
- Steam generated and superheated in the tubes 38 is passed in a conduit 42 to the high pressure turbine 44, from there in the conduit 46 to the intermediate superheater 40 and from there in the conduit 48 to the low pressure turbine 50.
- the turbines 44 and 50 drive the generator 52.
- Steam for feedwater preheating can be taken out from the turbine 44, 50 through the steam extraction conduit 54.
- the low pressure turb ine 50 is connected to the condenser 56 through the conduit 58. Condensate is collected in the condensate tank 60.
- the feedwater pump 62 pumps the condensate through the feedwater preheaters 64, 66 and 68 and the conduit 70 to the steam tubes 38 in the combustor 10. Heat from the intermediate cooler 36 of the compressor and heat from the steam extracted from the turbine 44, 50 can be utilized for the preheating in the feedwater preheaters 64 and 66.
- the waste gases from the gas turbine 30 are passed to the feedwater preheater 68 via the conduit 71 and from there to the steam boiler 72, the feedwater preheater 74 for heating feed water to the steam boiler 72, the gas filter 76, the economizer 78 and from there to the chimney 80.
- an ash cooler 82 is utilized as preheater for the feedwater of the steam boiler 72.
- Water from the steam drum 84 of the boiler 72 is circulated through the tubes 86 by means of a circulation pump 88.
- the steam drum is connected to the steam injection nozzles in the combustor by means of the steam conduit 90.
- Dilution water to the plant is supplied via the conduit 92.
- the economizer 78 is connected, by a conduit 94, to the feedwater conduit 96 downstream of the feedwater pump 62 and is utilized for feeding the tubes 38 in the combustor 10 as well as for feeding the steam boiler 72.
- the feedwater flow to the steam boiler 70 is controlled by a valve 98 in the conduit 100 between the economizer 78 and the ash cooler/feedwater preheater 82.
- the high temperature economizer/the feedwater preheater 68 is dimensioned such that the waste gases from the steam turbine which leave the feedwater preheater 68 have such a temperature that steam with a pressure exceeding 16 bar can be generated.
- the steam boiler 72 a suitable quantity of steam with a pressure of about 20 bar can be generated.
- the suitable quantity is about 25 kg/s .
- the steam is injected into the combustor and increases the mass flow through the turbine and hence the gas turbine power generation. The heating of the steam injected into the combustor results in reduced steam generation in the steam cycle and reduced power.
- the power gain in the gas turbine cycle is at least twice as great as the power loss in the steam turbine cycle.
- the net power gain may amount to 10-15 MW e in an 800 plant. This corresponds to an increase of the total efficiency of the plant of about 1-2%. A total net efficiency of approximately 46% is obtainable.
- the power gain is achieved without any increase in the cost of installation.
- the cost increase for the gas turbine cycle is insignificant and is compensated for by reduced costs in the steam turbine cycle. This results in smaller and hence less expensive steam turbines and condenser.
- the increased consumption of feedwater for generation of steam in the waste heat boiler 72 for bed injection entails a certain increased operating cost for preparation of the feedwater.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
La présente invention se rapporte à un procédé pour accroître le rendement total d'une centrale électrique PFBC avec un cycle de turbine à gaz et un cycle de turbine à vapeur. De la chaleur à faible pouvoir calorifique est utilisée pour produire de la vapeur qui est injectée dans le brûleur (10) et augmente le flux massique à travers la turbine à gaz (30) et par conséquent la puissance générée par la turbine à gaz. De préférence, les gaz perdus issus de la turbine à gaz (30) de la centrale sont utilisés pour générer de la vapeur dans un générateur de vapeur (84) séparé du cycle de vapeur principal (38, 40). L'invention concerne également une centrale électrique PFBC dans laquelle de la vapeur à faible pouvoir calorifique est injectée dans le brûleur (10).The present invention relates to a method for increasing the total efficiency of a PFBC power plant with a gas turbine cycle and a steam turbine cycle. Low calorific heat is used to produce steam which is injected into the burner (10) and increases the mass flow through the gas turbine (30) and therefore the power generated by the gas turbine. Preferably, the waste gases from the gas turbine (30) of the plant are used to generate steam in a steam generator (84) separate from the main steam cycle (38, 40). The invention also relates to a PFBC power station in which steam with low calorific value is injected into the burner (10).
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8900384 | 1989-02-03 | ||
SE8900384A SE463220B (en) | 1989-02-03 | 1989-02-03 | SET TO INCREASE THE EFFECTIVENESS OF A PFBC POWER PLANT AND POWER PLANT |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0456702A1 true EP0456702A1 (en) | 1991-11-21 |
Family
ID=20374945
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19900902709 Ceased EP0456702A1 (en) | 1989-02-03 | 1990-02-01 | Method of controlling a pfbc power plant and a pfbc power plant with equipment for such control |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0456702A1 (en) |
JP (1) | JPH04503235A (en) |
CA (1) | CA2046617A1 (en) |
FI (1) | FI913694A0 (en) |
SE (1) | SE463220B (en) |
WO (1) | WO1990008887A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2624891B2 (en) * | 1990-11-30 | 1997-06-25 | 株式会社日立製作所 | Pressurized fluidized bed boiler power plant |
US5375409A (en) * | 1993-10-08 | 1994-12-27 | Ahlstrom Pyropower, Inc. | Pressurized fluidized bed combined gas turbine and steam turbine power plant with steam injection |
DE19902437C5 (en) * | 1999-01-22 | 2017-01-12 | General Electric Technology Gmbh | Method and device for rapid startup and for rapid increase in output of a gas turbine plant |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3066816D1 (en) * | 1979-06-15 | 1984-04-12 | Energy Equip | Method and apparatus enabling thermal energy recovery in combustor operation |
SE434883B (en) * | 1980-10-15 | 1984-08-20 | Stal Laval Turbin Ab | SET TO OPERATE A COMBINED GAS ANTURBIN INSTALLATION AND COMBINED GAS ANTURBIN INSTALLATION FOR USE OF THE SET |
US4424766A (en) * | 1982-09-09 | 1984-01-10 | Boyle Bede Alfred | Hydro/pressurized fluidized bed combustor |
US4488512A (en) * | 1982-11-04 | 1984-12-18 | Boyle Bede Alfred | Feedstock injection system for fluidized bed combustor |
DE3518512A1 (en) * | 1985-05-23 | 1986-11-27 | Inter Power Technologie GmbH, 6600 Saarbrücken | METHOD FOR GENERATING ELECTRICITY AND HEAT BY MEANS OF A PRINTED FLUID BED BURNER |
-
1989
- 1989-02-03 SE SE8900384A patent/SE463220B/en not_active IP Right Cessation
-
1990
- 1990-02-01 WO PCT/SE1990/000067 patent/WO1990008887A1/en not_active Application Discontinuation
- 1990-02-01 JP JP50274590A patent/JPH04503235A/en active Pending
- 1990-02-01 EP EP19900902709 patent/EP0456702A1/en not_active Ceased
- 1990-02-01 CA CA 2046617 patent/CA2046617A1/en not_active Abandoned
-
1991
- 1991-08-02 FI FI913694A patent/FI913694A0/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9008887A1 * |
Also Published As
Publication number | Publication date |
---|---|
CA2046617A1 (en) | 1990-08-04 |
SE463220B (en) | 1990-10-22 |
JPH04503235A (en) | 1992-06-11 |
WO1990008887A1 (en) | 1990-08-09 |
FI913694A0 (en) | 1991-08-02 |
SE8900384D0 (en) | 1989-02-03 |
SE8900384L (en) | 1990-08-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4253300A (en) | Supplementary fired combined cycle power plants | |
CN1074084C (en) | Combined combustion and steam turbine power plant | |
CA1314713C (en) | Gas turbine power plant fired by a water-bearing fuel and method for utilizing the heat value of said fuel | |
US4223529A (en) | Combined cycle power plant with pressurized fluidized bed combustor | |
EP0680548B1 (en) | Combined cycle power plant incorporating atmospheric circulating fluidized bed boiler and gasifier | |
KR910009058B1 (en) | Integrated gas turbine power generation system and process | |
RU2009333C1 (en) | Combined steam-gas power plant and method of its operation | |
GB2338991A (en) | Compound power-generating plant with superheated high pressure steam | |
CN1277339A (en) | Combined circular coal-burning power generating system and method adopting partial gasification and air preheating | |
US4637212A (en) | Combined hot air turbine and steam power plant | |
KR100205798B1 (en) | A combined gas and steam cycle pressurized fluidized bed boiler power plant and a method of establishig and operating the same | |
EP0456702A1 (en) | Method of controlling a pfbc power plant and a pfbc power plant with equipment for such control | |
CA1179154A (en) | Efficient combined cycle system employing a high temperature combustion turbine and a fluidized coal bed with economic exclusion of sulfur from system waste gases | |
US5622043A (en) | Gas and steam electrical power generating system | |
EP0325142A2 (en) | Power plant for burning fuel in a fluidised bed at above atmospheric pressure. | |
Takano et al. | Design for the 145-MW blast furnace gas firing gas turbine combined cycle plant | |
RU2109970C1 (en) | Method and device for operating combined-cycle plant (options) | |
CA1119007A (en) | Process and arrangement for operating a steam power station | |
JP2694870B2 (en) | Heat and power generation plant | |
Foster-Pegg | A small air turbine power plant fired with coal in an atmospheric fluid bed | |
JPH0559905A (en) | Refuse incinerating gas turbine composite plate | |
US20040139749A1 (en) | Method for operating a steam power plant and steam power plant for carrying out said method | |
Berman et al. | High Efficiency Pressurized Fluid Bed Systems | |
CN116771505A (en) | Woody biomass micro gas turbine and operation control method thereof | |
JPH11108320A (en) | Waste combustion treatment method |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19910801 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB IT LI LU NL |
|
17Q | First examination report despatched |
Effective date: 19921208 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
18R | Application refused |
Effective date: 19930531 |