WO1997001025A1 - A method and a device for generating additional energy in a power plant - Google Patents
A method and a device for generating additional energy in a power plant Download PDFInfo
- Publication number
- WO1997001025A1 WO1997001025A1 PCT/SE1996/000804 SE9600804W WO9701025A1 WO 1997001025 A1 WO1997001025 A1 WO 1997001025A1 SE 9600804 W SE9600804 W SE 9600804W WO 9701025 A1 WO9701025 A1 WO 9701025A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- flue gases
- supply
- fuel
- cooling medium
- additional fuel
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K3/00—Plants including a gas turbine driving a compressor or a ducted fan
- F02K3/08—Plants including a gas turbine driving a compressor or a ducted fan with supplementary heating of the working fluid; Control thereof
-
- 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
- F02C3/30—Adding water, steam or other fluids for influencing combustion, e.g. to obtain cleaner exhaust gases
-
- 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
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/16—Fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures, e.g. by the arrangement of the combustion chamber and its auxiliary systems inside a pressure vessel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/22—Fuel feeders specially adapted for fluidised bed combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/002—Supplying water
Definitions
- the present invention relates to a method and a device for generating additional energy in a power plant having a com ⁇ bustor with a bed, to which air and fuel are intended to be supplied for combustion of the fuel therein while forming hot flue gases over the bed, as well as a gas turbine driven by these flue gases for generating energy.
- the invention comprises such generating of additional energy in all types of power plants having these characteristics, and heat energy will in practise nearly always be tapped from the bed by heat exchange with for instance a set a tubes immersed therein for generating steam and this is by that used as an excellent heat conductor, but the invention is not in any way restricted to any necessity that this has to take place.
- the bed may be of different nature, but in order to eliminate but not in any way restrict the invention the case of such a generating of additional energy in a power plant having a fluidised bed and the set of tubes im ⁇ mersed therein for generating steam to a steam turbine will be described hereinafter.
- the object of the present invention is to provide a method as well as a device of the type defined in the introduction, which make it possible to generate additional energy in such a power plant so as to meet the desires mentioned above.
- This object is according to the invention obtained by pro ⁇ viding a method and a device according to the appended inde- pendent claims, in which such a device comprises means ar ⁇ ranged to supply additional fuel in the path of said flue gases between said bed and the gas turbine for utilising ex ⁇ cess oxygen available in the flue gases for combustion of this fuel there and members arranged to supply a cooling me- dium to the flue gases in connection with said supply of ad ⁇ ditional fuel to the flue gas path for regulating the tem ⁇ perature of the flue gases to a desired level.
- the additional energy aimed at may be generated by utilising the excess of oxygen present in the hot flue gases deriving from the bed for combustion of additional fuel sup- plied in said flue gas path and combusted there through con ⁇ tact with the hot flue gases in the presence of the oxygen present therein.
- the temperature of the flue gases may at the same time be kept on an acceptable level, primarily for the gas turbine.
- the additional energy generated in this way will result in an increased generation of power of the gas turbine, which means that in power plants in which this will not reach its maximum capacity at regular full load operation an increased power may be delivered by the gas turbine and the maximum total power of the plant may by that be increased.
- the oxygen content in the flue gases leaving said bed will be at least at a certain value, since it is necessary to have such a high oxygen content there for avoiding that locally in the bed, such as close to the point for feeding fuel thereinto, a shortage of oxygen will be created with the disadvantages this will lead to in the form of a power reduction, in- creased production of S0 X and the like. It will on the other hand be sufficient to have the lower content of oxygen in the flue gas paths so as to avoid different problems such as corrosion therein, which means that there is a quantity oxy ⁇ gen that may be used for combustion in the flue gas path.
- a load increase required from a certain partial load to an ⁇ other partial load or from a partial load to the full load may also be accelerated through the device according to the invention. If the volume flow to the gas turbine of a power plant equipped with the device according to the invention is kept constant, which often is the case, the fact that the gas (usually water steam) produced through the combustion of the additional fuel in said flue gas paths will occupy a part of the flue gas flow, means that the net flow of air to the pressure vessel will increase, since the flow of the air to the bed is somewhat reduced, while the flow into the pressure vessel will not be changed with respect to the ab ⁇ sence of the combustion of the additional fuel.
- said means and members are arranged to supply said additional fuel and the cooling medium, respectively, to the combustor in the free space over the bed for combustion of the addi ⁇ tional fuel there.
- Addi ⁇ tionally there is no risk for damaging any sensitive equip ⁇ ment there as a consequence of any locally increased tem ⁇ perature.
- said means and members for supply of the additional fuel and the cooling medium are arranged to supply these together in a mixture, which simplifies the design of a device according to the invention further.
- a mixture of oil and water may be sprayed into said flow gas path.
- the device comprises an arrangement for controlling the sup ⁇ ply rate to the flue gas path of the additional fuel and the cooling medium and a ratio of these two rates, which makes it possible to achieve an additional energy generation by the device according to the different needs and conditions existing.
- the device comprises according to a preferred em ⁇ bodiment of the invention a member arranged to measure the temperature of the flue gases in said flue gas path down- stream the location for supply of the additional fuel and the cooling medium, and the control arrangement is arranged to carry out said control in dependence of the temperature information received from this member.
- the invention is particularly advantageous in a power plant, in which the flue gases leav ⁇ ing the bed have already a temperature being close to what the flue gas paths to the gas turbine may withstand, since it will in such a case be of a totally decisive importance for the possibility to any additional energy generation, that the combustion carried out therein will be followed by a direct cooling for maintaining the temperature of the flue gases at substantially this level.
- the invention is never- theless of course applicable to and very advantageous also in power plants allowing a certain temperature raise of the flue gases, for instance by the fact that a high temperature filter is arranged comparatively far upstream in the flue gas path.
- the device comprises a member arranged to measure the oxygen content of the flue gases in said flue gas path downstream the location for supply of the additional fuel and the cooling medium, and the control arrangement is ar- ranged to carry out said control in dependence of data about the oxygen content in the flue gases received from this mem ⁇ ber.
- additional fuel is supplied in said flue gas path between said bed and the gas turbine for utilising excess oxygen available in the flue gases for com ⁇ bustion of this fuel therein, and a cooling medium is sup ⁇ plied to the flue gases in connection with said supply of fuel to the flue gas path for regulating the temperature of the flue gases to a desired level.
- Fig. 1 illustrates schematically a PFBC-power plant hav- ing a combined gas- and steam cycle (the latter is not shown), in which a device according to the in ⁇ vention may be applied, and
- Fig. 2 is a schematic partially sectioned view of the pressure vessel with the combustor arranged therein of a power plant according to Fig. 1, which illustrates a preferred embodiment of the method according to the invention and the device according to the invention.
- the invention is as already mentioned not in any way re- stricted to the use in a PFBC-power plant, i.e. a plant for combustion of particle-like fuel in a pressurised fluidised bed, but it has great advantages in the use in such a power plant, which is the reason for now describing it applied in such a plant and the general construction and the function of an embodiment of such a power plant will now be explained with reference to Fig. 1.
- the plant comprises a combustor 1, which is received in a pressure vessel 2, which may have a volume in the order of 10 ⁇ m ⁇ and which may be pressurised to for example about 16 bars.
- Compressed air 3 for pressurising the combustor 1 and for fluidising a bed 4 in the combustor is applied to the pressure vessel.
- the compressed air is applied to the com ⁇ bustor through fluidising nozzles 5 schematically indicated at the bottom of the combustor for fluidising the bed en- closed in the combustor.
- the bed is made of bed material, granule-shaped absorbent and particle-like fuel, preferably crushed carbon, which is combusted in the fluidising air led to the bed.
- the combustion gases hereafter called flue gases
- a purification plant 7 illus- trated through a box, which for instance may be constituted by a set of cyclones arranged to separate particles from the flue gases.
- the flue gases continues to a gas turbine 9 com ⁇ prising a high pressure step 10 and a low pressure step 11.
- the high pressure turbine 10 is arranged on the same axle as a high pressure compressor 12 as well as a generator 13, which in this way is driven by the high pressure turbine for taking useful energy therefrom.
- the high pressure compressor 12 delivers compressed air to the combustor 1 through the conduit 14.
- the gas expanded in the high pressure turbine 10 is led to a low pressure turbine 11.
- the exhaust gases leaving the low pressure turbine will still contain energy, which an econo- miser 16 may take care of.
- a low pressure compressor 17 is also arranged on the axle of the low pressure turbine and atmospheric air is supplied thereto through a filter 18.
- the low pressure compressor is driven by the low pressure turbine and provides the high pressure compressor 12 with air compressed in a first step from its outlet.
- An intercooler 19 is arranged between the low pressure compres ⁇ sor and the high pressure compressor, so as to lower the air temperature of the air supplied to the inlet of the high pressure compressor 12.
- the power plant has also a steam turbine side, which is not shown here, but it is indicated through a set 20 of tubes immersed in the fluidised bed 4, in which water is circu ⁇ lated and evaporated and superheated through heat exchange between the tubes and the bed material for absorbing heat generated by the combustion carried out in the bed.
- the power output i.e. the load of a power plant of this type
- the power output may be controlled by regulating the level of the bed as well as the flow of the fuel and air supplied to the bed.
- the invention shows solutions to this problem, in which it when meeting the latter desire requires that the gas turbine of the plant is not operating at the power limit thereof in the regular full load state of the plant.
- FIG. 2 A device according to a preferred embodiment of the inven ⁇ tion will now be explained with reference to primarily Fig. 2, in which the pressure vessel 2 and the combustor 1 ar- ranged therein in the plant are schematically shown.
- hot flue gases having a temperature of 800-850 ⁇ C are created over the bed, which corresponds to the temperature which may be han ⁇ dled by the gas paths to the gas turbine 9 without different problems, should not the plant have a high temperature fil ⁇ ter.
- the de- vice has a means 21 schematically indicated and arranged to spray an additional fuel into the free space 22, the so called free board, over the bed 4.
- This fuel may be constituted by natural gas, oil, carbon or the like.
- the device comprises further a member 23 arranged to spray the cooling medium, preferably water in liquid state or in steam phase into the free space 22 for cooling the flue gases, so that the temperature thereof may be regu ⁇ lated to a level desired especially for the flue gas paths and the gas turbine.
- the water may then advantageously be supplied in the form of liquid droplets, so that also the evaporation heat thereof may be used for an efficient cool ⁇ ing.
- the additional fuel and the cooling medium may be supplied in the way that is considered to be the most advantageous one in every given situation, and the illustration in Fig. 2 is only made so as to explain the invention.
- the additional fuel and cooling medium may advantageously be supplied in the form of a mixture, for example oil droplets mixed up with water droplets.
- the device comprises also members 24 and 25 schematically indicated and arranged to measure the temperature and the O2 ⁇ content, respectively, in the flue gases downstream the location for supply of the additional fuel and the cooling medium and send an information about these parameters to the control arrangement schematically indicated, which is ar ⁇ ranged to control the supply rate of the additional fuel and the cooling medium to the free space 22 and the ratio be ⁇ tween these rates in dependence of the magnitudes of the pa ⁇ rameters measured.
- Supply rate is defined as amount sup- plied/time unit. It is preferably also possible to provide possibilities for hand-operated influence of the control ar- rangement or directly of said means 21 and the member 23. It would also be possible to let the control arrangement work according to any given control programme, which for instance starts the supply of the additional fuel and cooling medium as soon as it is called for a load increase.
- the function of the device according to the invention is as follows.
- said means 21 and the members 23 may be controlled to supply additional fuel and the cooling medium to the free space 22 for cooled so called "free board firing" there by utilising the excess of oxygen present in the flue gases, if the gas turbine is not limiting for the plant.
- the mass flow to the gas turbine is in this way increased, which at a constant volume flow leads to an increased pressure and by that a higher power delivered by the gas turbine. It would also be well possible to increase the maximum total power which may be tapped from the power plant in this way by in the order of 10%.
- the bed 4 When the plant is driven at a comparatively low load, the bed 4 will only cover a part of the set 20 of the tubes, which means that the gases leaving the bed have a lower temperature than desired, maybe 600-650°C and the de ⁇ vice according to the invention may in this case be used for raising the temperature of the flue gases by possibly only spraying additional fuel in through the means 21 without any cooling for obtaining a high efficiency of the plant at par ⁇ tial load, even though it is not this principle on which the invention is based.
- said means 21 and the member 23 may supply the additional fuel and the cooling medium to the free space 22 so as to immediately utilise oxygen present therein for an additional combustion by which an accelerating load in ⁇ crease may be obtained as mentioned in the introduction either through keeping the mass flow to the gas turbine con ⁇ stant, which enables a faster pressurising of the pressure vessel and by that load increase, or the mass flow to the gas turbine is increased, but the pressurising of the pres ⁇ sure vessel is allowed to take place just as fast as without any additional combustion, which means that it will be pos ⁇ sible to directly have a higher power, so that the load in ⁇ crease does not have to be started by a lowering of the ad ⁇ ditional power directly required by the gas turbine compres ⁇ sor so as to be able to press an increased flow of air into the pressure vessel.
- the invention meets in a very advantageous way the de ⁇ sires of generation of additional energy sometimes appearing in such a power plant.
- This may take place by very simple means and to a low cost, since the oxygen already there in the flue gas paths is utilised for the combustion.
- no extra pressurising of air is required, which would cost power and reduce the efficiency of the additional combus ⁇ tion.
- the device according to the invention will thereto be cheap since it will not require any expensive compressors or the like.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96921195A EP0834008A1 (en) | 1995-06-20 | 1996-06-19 | A method and a device for generating additional energy in a power plant |
JP9503787A JPH11508344A (en) | 1995-06-20 | 1996-06-19 | Method and apparatus for generating additional energy in a power plant |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9502234-9 | 1995-06-20 | ||
SE9502234A SE503926C2 (en) | 1995-06-20 | 1995-06-20 | Method and apparatus for additional power generation in a power plant |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997001025A1 true WO1997001025A1 (en) | 1997-01-09 |
Family
ID=20398678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1996/000804 WO1997001025A1 (en) | 1995-06-20 | 1996-06-19 | A method and a device for generating additional energy in a power plant |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0834008A1 (en) |
JP (1) | JPH11508344A (en) |
KR (1) | KR19990023027A (en) |
CN (1) | CN1167518A (en) |
SE (1) | SE503926C2 (en) |
WO (1) | WO1997001025A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998046863A1 (en) * | 1997-04-14 | 1998-10-22 | Ebara Corporation | Pressurized fluidized-bed combined-cycle electric generating system |
EP0933504A1 (en) * | 1997-06-27 | 1999-08-04 | Mitsubishi Heavy Industries, Ltd. | Pressurized fluidized-bed combined cycle power generation system |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1162643C (en) * | 2000-07-28 | 2004-08-18 | 中国国际工程咨询公司 | Combined circular coal-burning power generating system and method adopting partial gasification and air preheating |
WO2005092583A1 (en) * | 2004-02-27 | 2005-10-06 | United States Gypsum Company | Swinging agitator for a gypsum calcining apparatus and the like |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0312840A1 (en) * | 1987-10-20 | 1989-04-26 | Abb Stal Ab | PFBC power plant |
US5043150A (en) * | 1990-04-17 | 1991-08-27 | A. Ahlstrom Corporation | Reducing emissions of N2 O when burning nitrogen containing fuels in fluidized bed reactors |
WO1993022600A1 (en) * | 1992-04-30 | 1993-11-11 | Abb Carbon Ab | Method for maintaining a nominal working temperature of flue gases in a pfbc power plant |
-
1995
- 1995-06-20 SE SE9502234A patent/SE503926C2/en not_active IP Right Cessation
-
1996
- 1996-06-19 CN CN96190720A patent/CN1167518A/en active Pending
- 1996-06-19 EP EP96921195A patent/EP0834008A1/en not_active Withdrawn
- 1996-06-19 WO PCT/SE1996/000804 patent/WO1997001025A1/en not_active Application Discontinuation
- 1996-06-19 KR KR1019970709497A patent/KR19990023027A/en not_active Application Discontinuation
- 1996-06-19 JP JP9503787A patent/JPH11508344A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0312840A1 (en) * | 1987-10-20 | 1989-04-26 | Abb Stal Ab | PFBC power plant |
US5043150A (en) * | 1990-04-17 | 1991-08-27 | A. Ahlstrom Corporation | Reducing emissions of N2 O when burning nitrogen containing fuels in fluidized bed reactors |
WO1993022600A1 (en) * | 1992-04-30 | 1993-11-11 | Abb Carbon Ab | Method for maintaining a nominal working temperature of flue gases in a pfbc power plant |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998046863A1 (en) * | 1997-04-14 | 1998-10-22 | Ebara Corporation | Pressurized fluidized-bed combined-cycle electric generating system |
JP2001521611A (en) * | 1997-04-14 | 2001-11-06 | 株式会社 荏原製作所 | Pressurized fluidized bed boiler combined cycle power generation system |
EP0933504A1 (en) * | 1997-06-27 | 1999-08-04 | Mitsubishi Heavy Industries, Ltd. | Pressurized fluidized-bed combined cycle power generation system |
EP0933504A4 (en) * | 1997-06-27 | 2002-07-10 | Mitsubishi Heavy Ind Ltd | Pressurized fluidized-bed combined cycle power generation system |
Also Published As
Publication number | Publication date |
---|---|
KR19990023027A (en) | 1999-03-25 |
SE9502234L (en) | 1996-09-30 |
SE503926C2 (en) | 1996-09-30 |
EP0834008A1 (en) | 1998-04-08 |
CN1167518A (en) | 1997-12-10 |
SE9502234D0 (en) | 1995-06-20 |
JPH11508344A (en) | 1999-07-21 |
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