AU651871B2 - Dressing brown coal prior to combustion - Google Patents
Dressing brown coal prior to combustion Download PDFInfo
- Publication number
- AU651871B2 AU651871B2 AU12347/92A AU1234792A AU651871B2 AU 651871 B2 AU651871 B2 AU 651871B2 AU 12347/92 A AU12347/92 A AU 12347/92A AU 1234792 A AU1234792 A AU 1234792A AU 651871 B2 AU651871 B2 AU 651871B2
- Authority
- AU
- Australia
- Prior art keywords
- steam
- coal
- dressing
- fluidised bed
- exhaust vapour
- 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
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10F—DRYING OR WORKING-UP OF PEAT
- C10F5/00—Drying or de-watering peat
-
- 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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
-
- 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
- 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
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
- F23K1/04—Heating fuel prior to delivery to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2200/00—Mathematical features
- F05B2200/20—Special functions
- F05B2200/26—Special functions trigonometric
- F05B2200/261—Sine
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Drying Of Solid Materials (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Description
fPI DlATE 15/09/92 APPLN. Tn 12347 2 I PCT NUMBER PCT/nE92/oni1o0 R NSIBER DIE(P .NS (PCT) SAOJP DATE 29/10/92
INT.
(51) Internationale Patentklassifikation 5 Internationale Veriffentlichungsnummer: WO 92/14802 5/00, F01K 23/06 Al (43) Internakionales Ver6ffentlichungsdatum: 3. September 1992 (03.09.92) (21) Internationales Aktenzeichen: PCT/DE92/00108 Veriffentlicht Mit internationalem Recherchenbericht.
(22) Internationales Anmeldedatum: 13. Februar 1992 (13.02.92) Vor Ablauf der.lur Anderungen der Anspriiche zugelassenen Frist. Veriffentlichung wird wiederholt falls 4Anderungen eintreffen.
Prioritiitsdaten: P41 05 128.9 15. Februar 1991 (15.02.91) DE (71) Anmelder: VEAG VEREINIGTE ENERGIEWERKE AK- TIENGESELLSCHAFT [DE/DE]; Allee der Kosmo- navten 29, D- 140 Berlin r (81) Bestimmungsstaaten: AT (europiisches Patent), AU, BE -(europiisches Patent), BG, CA, CH (europaisches Patent), DE (europaisches Patent), DK (europiisches Patent), ES (europaisches Patent), FR (europaisches Patent), GB (europaisches Patent), GR (europiisches Patent), HU, IT (europaisches Patent), JP, LU (europaisches Patent), MC (europilisches Patent), NL (europLisches Patent), RO, RU, SE (europiisches Patent).
(54) Title: PROCESS FOR DRESSING BROWN COAL FOR COMBINED GAS AND STEAM PROCESSES (54) Bezeichnung: VERFAHREN ZUR BRAUNKOHLENAUFBEREITUNG FOR GAS-DAMPF-KOMBIPROZESSE (57) Abstract The invention concerns a process for dressing brown coal for combined gas and steam processes in heat-generating installations. The aim of the invention is to achieve substantial reduction of the CO2 emission per useful effect unit by reduced use of fossil energy carriers; the devices for drying raw brown coal are to be connected to the heat-generating installation in such a manner that the energy of the exhaust vapours is fully utilized. To this end, the drying container is operated in conjunction with a pressurized fluidized bed combustor, a gas turbine, a steam turbine, a pneumatically heated steam intermediate heater and a waste heat boiler; the drying energy for the drying container is obtained from saturated steam from the waste heat boiler of the combined process; the energy content of the de-dusted exhaust vapours under medium pressure is used to evaporate a partial flow of feed water; the gas turbine is operated with exhaust gases from the pressurized fluidized bed combustor; condensed combustion air is used for intermediate superheating of the steam, with cooling of the combustion air; and the exhaust vapour co-densate formed by energetic connection is prepared and used to supply water for the circulation process.
I PROCESS FOR DRESSING BROWN COAL IN COMBINED GAS AND STEAM PROCESSES The invention concerns a process for dressing brown coal in combined gas and steam processes of a heat or power generating plant.
Known is a plant arrangement for drying raw coal prior to its use in the generation of electricity in condensation power plants. This known arrangement enables to fully utilise the condensation heat of the exhaust vapour, but neither an exhaust vapour reverse compression nor a separate electric dedusting of the vapour is carried out. The drying is carried out in a filled shaft reactor provided with diaphragm tube walls acting as heating surfaces. Bleed steam from the main turbine of the power plant is used as heating steam and supplied to the filled shaft reactor. The exhaust vapour obtained therefrom is dedusted at the exit into the exhaust vapour channel, i.e. when leaving the dryer, by means of a filter wall which can be steam cleaned (DD-PS 281 237). According to DD-PS 281 237, the energy of the exhaust vapour is fully utilised as secondary energy only in that it is divided into several and qualitatively different applications; this division requires a complicated integration of different appliances into the overall conception of the plant. In addition, this plant arrangement is intended exclusively for power plants in which the generation of electricity is effected in "pure" condensation operation only.
Further, it is known to operate a combined gas-steam process of a power plant according to DE-OS 39 07 217.
The process divides itself into two separate technological concepts or stages, of which the concept shown in Fig. 1 includes the operation of the pre-stage gas turbine with natural gas. This solution is a trivial one and has been employed commercially for a number of S:17q5fl1V' z1 94 2 years. The second concept, shown in Fig. 2, includes a pressurised fluidised bed coal gasification of a partial coal flow. Since an additional fluidised bed drying of the steam is performed prior to the partial coal gasification, and this drying is not energetically interconnected with the combined unit, the drying process has to be performed with reverse compression of the exhaust vapour and external vapour dedusting, both of which require a considerable amount of electric power.
As a result, the combined unit has a low overall degree of efficiency of 42-44%. The technical complexity of equipment required by this type of combined unit is substantial since it requires, in addition to the usual equipment of a typical combined unit, a gas turbine, an intermediate air cooling unit, connecting pipelines and channels, a pressurised fluidised bed gasification reactor with associated hot gas deduster and a drying equi;Dment which is not energetically integrated into the combined unit and requires an extra power supply.
Also known is a combined gas-steam process using a pressurised fluidised bed combustor and iin which a pressurised dryer is thermally integrated into the combined unit (WO 90/00219). The pressurised exhaust vapour created in the drying process is conveyed to the steam boiler provided with the steam fluidised bed combustor, is mixed therein with the combustion gases of the solid fuel combustion and, after effecting dedusting of the waste gas, is conveyed to the waste gas turbine and expanded therein; the exhaust vapour so treated and injected into the flue gas flow accordingly generates an increased power output from the waste gas turbine without the need of proportionally increasing the power input to effect air compression. Hcwever, due to the resulting shift in the power chara teristics between the gas turbine and the steam turbine, only a slight improvement of the efficiency of the combined unit is achieved.
Furthermore, this arrangement does not permit any phase- S:17950F/12.4.94 3 shifted recovery of the drying energy used for drying the damp fuel.
It would be beneficial if the present invention could achieve in a power or heat generating plant a considerable reduction of CO 2 emissions per effective power output unit by using smaller amounts of fossil energy carriers. Heretofore, it would be advantageous to integrate the drying devices for the raw brown coal into the heat generating unit in such a manner as to fully use the energy of the exhaust vapours.
The present invention provides in one aspect thereof a process for dressing brown coal in combined gas-steam processes having a waste heat boiler and a coal dryer coupled by means of a heat transfer system, characterised by operating the coal dryer in combination with a pressurised fluidised bed combustor, a gas turbine, a steam turbine, an air-heated intermediate steam superheater and a waste heat boiler, utilising the energy content of the dedusted exhaust vapour of the coal dryer, which is under medium pressure, to evaporate a partial flow of feed water, operating the gas turbine with waste gases from the pressurised fluidised bed combustor, using compressed combustion air for intermediate steam superheating of steam in the intermediate steam superheater with cooling of the combustion air, and utilising the exhaust vapour condensate formed by the energy interconnection within the process and after treatment thereof to provide a water supply for the circulation process. A part of the exhaust vapour condensate obtained in the process can materially be utilised without any further processing as service water in an ash- or ash-binding agent reprocessing to produce a building material. The dry coal produced by the energetic interconnection process can be combusted in the pressurised fluidised bed combustor of the steam boiler with an excess of air in the range of 2 X 3, X being j- S:17950F/12.4.94 -4the excess of air ratio.
The present invention will be more fully understood from the following description of an embodiment thereof and which is provided with reference to the accompanying drawing in which: Fig. 1 schematically illustrates a raw brown coal dryer in a combined unit having a pressurised fluidised bed combustor.
As can be seen in Fig. 1, raw brown coal 9 reaches through a pulveriser a raw fine coal pre-heater 8 in which exhaust vapour can be condensed. A coal dryer 1 with heating surface bundle 2 is arranged in succession to the pre-heater 8. After being dried in the dryer 1, the coal and an additive are conveyed through a dry coaladditive feed system 3 into a sfam boiler 4 with pressurised fluidised bed combustor. The steam boiler 4 is connected with a steam turbine 5 whose cold line 15 of an intermediate steam superheating stage is connected with its hot line 16 via the air-heated intermediate steam superheater 13. Furthermore, the steam vessel 4 is connected with the waste gas stages 12 of a gas turbine plant which itself is coupled with a waste heat boiler 17. The waste heat boiler 17 includes heating surface 6 for the production of saturated steam and which is interconnected with heating surface 2 of the dryer 1.
The exhaust vapour created in the dryer 1 and in the preheater 8 are conveyed to a saturated steam generator 7 which condenses the exhaust vapour; the saturated steam generator 7 is itself connected to a saturated steam superheater 10 for cooling the ashes. The saturated steam superheater 10 is connected with the cold line of the steam turbine 5 via the steam feeding pipeline 14 and coupled to the steam boiler 4 and the ash processing unit 21. The air-heated intermediate steam superheater -35 13 is connected with the steam boiler 4 as well as the 3
S.
S:17950P/12.4.94 air compressor stages 11 of the gas turbine plant. The exhaust vapour condensate produced in the saturated steam generator 7 and in the pre-heater 8 is cooled in an exhaust vapour condensate cooler 19 and subsequently conveyed to the exhaust vapour condensate reprocessing unit 20. A partial flow 18 of the cooled exhaust vapour condensate can be conveyed to the ash processing unit 21 prior to being reprocessed. The remaining or all of the cooled condensate can be reused in the circulation process.
The concept according to the present invention has the advantage that the gas-steam combined plant with pressurised fluidised bed comb dtor can be operated with very damp brown coal, nonetheless achieving a coefficient of efficiency n of 47-48% for the combined process under nominal or partial loads as well as with an air excess ratio X of 2.7.
S :17950F/12.4.94
Claims (4)
1. Process for dressing brown coal in combined gas- steam processes having a waste heat boiler and a coal dryer coupled by means of a heat transfer system, characterised by operating the coal dryer in combination with a pressurised fluidised bed combustor, a gas turbine, a steam turbine, an air-heated intermediate steam superheater and a waste heat boiler, utilising the energy content of the dedusted exhaust vapour of the coal dryer, which is under medium pressure, to evaporate a partial flow of feed water, operating the gas turbine with waste gases from the pressurised fluidised bed combustor, using compressed combustion air for intermediate steam superheating of steam in the intermediate steam superheater with cooling of the combustion air, and utilising the exhaust vapour condensate formed by the energetic interconnection of the process after treatment thereof to provide a water supply for the circulation process.
2. Process according to claim 1, characterised by materially utilising part of the exhaust vapour condensate formed by the energetic interconnection of the process without any further processing as service water in an ash- or ash-binding agent reprocessing to produce a building material.
3. Process according to claim 1, characterised by combusting the dry coal produced by the energetic interconnection of the process In the pressurised fluidised bed combustor of the steam boiler with an excess of air in the range of 2 X 3.
4. Process for dressing brown coal for combined gas- steam processes as hereinbefore described with reference to Fig. 1. DATED this 12th day of April 1994 VEAG VEREINIGTE ENERGIEWERKE By their Patent Attorneys GRIFFITH HACK CO S:1795P/12.4.94
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4105128A DE4105128A1 (en) | 1991-02-15 | 1991-02-15 | METHOD FOR TREATING BROWN COAL FOR GAS-STEAM COMBINATION PROCESSES |
| DE4105128 | 1991-02-15 | ||
| PCT/DE1992/000108 WO1992014802A1 (en) | 1991-02-15 | 1992-02-13 | Process for dressing brown coal for combined gas and steam processes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU1234792A AU1234792A (en) | 1992-09-15 |
| AU651871B2 true AU651871B2 (en) | 1994-08-04 |
Family
ID=6425385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU12347/92A Ceased AU651871B2 (en) | 1991-02-15 | 1992-02-13 | Dressing brown coal prior to combustion |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0639214B1 (en) |
| JP (1) | JPH07507333A (en) |
| AU (1) | AU651871B2 (en) |
| DE (2) | DE4105128A1 (en) |
| WO (1) | WO1992014802A1 (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4105129A1 (en) * | 1991-02-15 | 1992-08-20 | Ver Energiewerke Ag | METHOD FOR DRYING WATER-BASED SOLID FUELS, IN PARTICULAR RAW BROWN COAL |
| EP0639220B1 (en) * | 1992-05-08 | 2001-04-04 | State Electricity Commission Of Victoria | Integrated carbonaceous fuel drying and gasification process |
| DE4228206C2 (en) * | 1992-08-28 | 1996-07-11 | Steag Ag | Method and device for operating a gas turbine plant |
| FI99051C (en) * | 1992-10-08 | 1997-09-25 | Imatran Voima Oy | Method and coupling to facilitate the feeding of fuel to a pressurized space |
| WO1995024591A1 (en) * | 1994-03-09 | 1995-09-14 | Veag Vereinigte Energiewerke Ag | Process and device for operating a pressure-loaded, lignite-fed, circulating fluidised bed furnace for composite power stations |
| DE19601031A1 (en) * | 1996-01-13 | 1997-07-17 | Lurgi Lentjes Babcock Energie | Steam generator with pressurized circulating fluidized bed combustion |
| WO1997034075A1 (en) * | 1996-03-14 | 1997-09-18 | Siemens Aktiengesellschaft | Prevention of encrustation of a steam turbine blade by injection of pure steam |
| US8523963B2 (en) | 2004-10-12 | 2013-09-03 | Great River Energy | Apparatus for heat treatment of particulate materials |
| US7275644B2 (en) | 2004-10-12 | 2007-10-02 | Great River Energy | Apparatus and method of separating and concentrating organic and/or non-organic material |
| US8062410B2 (en) | 2004-10-12 | 2011-11-22 | Great River Energy | Apparatus and method of enhancing the quality of high-moisture materials and separating and concentrating organic and/or non-organic material contained therein |
| US7987613B2 (en) | 2004-10-12 | 2011-08-02 | Great River Energy | Control system for particulate material drying apparatus and process |
| US8579999B2 (en) * | 2004-10-12 | 2013-11-12 | Great River Energy | Method of enhancing the quality of high-moisture materials using system heat sources |
| PL379714A1 (en) * | 2006-05-17 | 2007-11-26 | Novatore Ag | The manner of raising efficiency and simultaneous lowering of combustion emission in the process of electric energy production and the system for its performance |
| WO2009101492A2 (en) * | 2008-02-14 | 2009-08-20 | Daniel Chablaix | Steam engine heated by the heat of compressed air |
| DE102011110218A1 (en) * | 2011-08-16 | 2013-02-21 | Rwe Power Aktiengesellschaft | Method for operating a power plant |
| JP5812896B2 (en) * | 2012-02-28 | 2015-11-17 | 三菱重工業株式会社 | Fluidized bed drying apparatus, gasification combined power generation facility, and drying method |
| CN102679689B (en) * | 2012-04-25 | 2014-10-22 | 曲靖众一精细化工股份有限公司 | Low energy consumption, low emission, coal quality guaranteed and safe drying method and device for chemical feed coal |
| CN103277155B (en) * | 2013-05-20 | 2016-01-13 | 华北电力大学 | Brown coal are predrying-preheated air-UTILIZATION OF VESIDUAL HEAT IN compound coal generating system |
| CN103573308B (en) * | 2013-11-12 | 2015-09-09 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of 1000MW fired power generating unit steam turbine 9 grades of regenerative steam systems |
| EP2894303A1 (en) * | 2014-01-10 | 2015-07-15 | Siemens Aktiengesellschaft | Method for the intermediate storage of excess electrical energy |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990010785A1 (en) * | 1989-03-07 | 1990-09-20 | L. & C. Steinmüller Gmbh | Operation of a combined gas turbine/steam turbine process |
| WO1991014801A1 (en) * | 1990-03-29 | 1991-10-03 | Hans Höllmüller Maschinenbau GmbH & Co. | Device for the electrolytic regeneration of an etching agent containing metal, especially copper |
| AU619025B2 (en) * | 1988-06-30 | 1992-01-16 | Imatran Voima Oy | Combined gas-turbine and steam-turbine power plant and method for utilization of the thermal energy of the fuel to improve the overall efficiency of the power-plant process |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE931617C (en) * | 1949-07-17 | 1955-08-11 | Grosskraftwerk Mannheim A G | Process for operating a pulverized coal furnace with grinding drying, heating of the broth and discharge of part of the broth into the open air |
| CS273337B2 (en) * | 1986-12-31 | 1991-03-12 | Rheinische Braunkohlenw Ag | Method of damp loose materials drying in a drier with a whirling bed and equipment for carrying out this method |
| DD277735A1 (en) * | 1988-12-07 | 1990-04-11 | Orgreb Inst Kraftwerke | METHOD FOR GENERATING ELECTRICAL ENERGY AND / OR HEATING AND PROCESSING WASTE |
-
1991
- 1991-02-15 DE DE4105128A patent/DE4105128A1/en not_active Ceased
-
1992
- 1992-02-13 JP JP4504126A patent/JPH07507333A/en active Pending
- 1992-02-13 DE DE59206257T patent/DE59206257D1/en not_active Expired - Fee Related
- 1992-02-13 EP EP92904443A patent/EP0639214B1/en not_active Expired - Lifetime
- 1992-02-13 WO PCT/DE1992/000108 patent/WO1992014802A1/en not_active Ceased
- 1992-02-13 AU AU12347/92A patent/AU651871B2/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU619025B2 (en) * | 1988-06-30 | 1992-01-16 | Imatran Voima Oy | Combined gas-turbine and steam-turbine power plant and method for utilization of the thermal energy of the fuel to improve the overall efficiency of the power-plant process |
| WO1990010785A1 (en) * | 1989-03-07 | 1990-09-20 | L. & C. Steinmüller Gmbh | Operation of a combined gas turbine/steam turbine process |
| WO1991014801A1 (en) * | 1990-03-29 | 1991-10-03 | Hans Höllmüller Maschinenbau GmbH & Co. | Device for the electrolytic regeneration of an etching agent containing metal, especially copper |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0639214A1 (en) | 1995-02-22 |
| JPH07507333A (en) | 1995-08-10 |
| DE59206257D1 (en) | 1996-06-13 |
| DE4105128A1 (en) | 1992-08-20 |
| WO1992014802A1 (en) | 1992-09-03 |
| AU1234792A (en) | 1992-09-15 |
| EP0639214B1 (en) | 1996-05-08 |
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