EP0267206A1 - Verfahren und anlage zur verringerung der stickoxidemission bei der verbrennung von mittel-und hochfluechtigen steinkohlen. - Google Patents
Verfahren und anlage zur verringerung der stickoxidemission bei der verbrennung von mittel-und hochfluechtigen steinkohlen.Info
- Publication number
- EP0267206A1 EP0267206A1 EP87902408A EP87902408A EP0267206A1 EP 0267206 A1 EP0267206 A1 EP 0267206A1 EP 87902408 A EP87902408 A EP 87902408A EP 87902408 A EP87902408 A EP 87902408A EP 0267206 A1 EP0267206 A1 EP 0267206A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- solid fuel
- degassing
- zone
- fuel
- combustion
- 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.)
- Granted
Links
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000001603 reducing effect Effects 0.000 title claims abstract description 11
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 title 1
- 239000003830 anthracite Substances 0.000 title 1
- 239000004449 solid propellant Substances 0.000 claims abstract description 38
- 238000002485 combustion reaction Methods 0.000 claims abstract description 37
- 238000007872 degassing Methods 0.000 claims abstract description 30
- 239000007789 gas Substances 0.000 claims abstract description 24
- 239000003546 flue gas Substances 0.000 claims abstract description 20
- 239000000446 fuel Substances 0.000 claims abstract description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000003245 coal Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract 2
- 238000009434 installation Methods 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000002737 fuel gas Substances 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000003039 volatile agent Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B90/00—Combustion methods not related to a particular type of apparatus
- F23B90/04—Combustion methods not related to a particular type of apparatus including secondary combustion
- F23B90/06—Combustion methods not related to a particular type of apparatus including secondary combustion the primary combustion being a gasification or pyrolysis in a reductive atmosphere
-
- 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
- F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
- F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
-
- 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
- F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
- F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
- F23C6/045—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure
- F23C6/047—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure with fuel supply in stages
-
- 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
- F23C2201/00—Staged combustion
- F23C2201/10—Furnace staging
- F23C2201/101—Furnace staging in vertical direction, e.g. alternating lean and rich zones
-
- 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
- F23C2201/00—Staged combustion
- F23C2201/30—Staged fuel supply
- F23C2201/301—Staged fuel supply with different fuels in stages
Definitions
- the invention relates to a method and a plant for reducing nitrogen oxide emissions during the combustion of solid fuels, in particular of medium and highly volatile hard coal, wherein a power combustion zone is followed by at least one reduction zone for nitrogen oxides.
- At least one reduction zone can be connected downstream of the power combustion zone, to which the reducing agent is fed.
- the reducing agent is advantageously used in liquid or gaseous form since, when solid reducing agents are used, they often do not react completely and the residues therefore still contain a high proportion of combustibles.
- the additional provision of, for example, fuel gas as a reduction gas for operating the reduction zone requires an increased outlay in terms of both investment and operating costs. It it has therefore already been proposed to provide the fuel gas required as a reducing agent by degassing or gasifying a corresponding amount of fuel diverted from the primary fuel (DE-OS 34 13 564).
- the measure of placing a reduction zone behind the power combustion zone is usually not sufficient to remove the applicable ones. Comply with or even fall below the emission standard values for nitrogen oxides, so that additional complex secondary measures are necessary to comply with NOx emission limit values.
- the object of the present invention is to provide a method of the type described at the outset and a system which is suitable for carrying out the method and which allow a further reduction in the nitrogen oxide emission and thus less effort for secondary measures.
- This object is achieved in that the entire solid fuel is degassed or partially degassed before it is burned.
- the degassed solid fuel is burned in the power combustion zone, expediently using primary measures such as air control.
- the combustion chamber temperature of the power combustion zone can be changed and the NOx concentration in the power combustion zone can thus be reduced.
- the nitrogen fraction separated off with the volatiles no longer enters the power combustion zone. zone arrives and can therefore no longer contribute to thermal NOx formation.
- the degassed residual solid fuel due to its porous structure, has less NOx formation than the original feed fuel, for example hard coal, with the appropriate fire control, and at the same time has a reducing effect.
- the thermal NOx formation can be influenced with lower combustion temperatures.
- the method according to the invention is particularly suitable for burning medium and highly volatile coal.
- the solid fuel to be fired is degassed to such an extent that an ignitable degassed solid fuel remains and a low NOx concentration is established in the power combustion zone.
- Part of the fuel gas obtained in the degassing of the solid fuel is expediently used directly in the reduction zone. Any excess gas that may remain can be withdrawn from the system and used for other purposes.
- the fuel nitrogen in the fuel gas produces further reducing gas components instead of NOx.
- the reduction zone is advantageously limited in the direction of flow of the flue gases by supplying air and the combustible reduction remaining after the reduction zone gases burned. It can also be expedient to arrange a plurality of reduction zones one behind the other in the direction of flow of the flue gases.
- the thermal energy required for degassing the solid fuel can at least partially be taken from the furnace or the flue gases of the power combustion zone down to flue gas temperatures of approximately 180 ° C. to 1000 ° C.
- the gasung 'dss: solid fuel necessary thermal energy can be covered by partial heat release from the solid fuel.
- a system for carrying out the method according to the invention is characterized in that the degassing device is arranged as a degassing section designed for continuous fuel throughput within the combustion system in the flue gas stream.
- the degassing device is arranged as a degassing section designed for continuous fuel throughput within the combustion system in the flue gas stream.
- the gases separated from the solid fuel can be wholly or partly fed directly to the or the reduction zones via gas outlets provided on the degassing section.
- a gas feed that is distributed differently over the flue gas cross section and the combustion chamber height is easily possible. It can be expedient to provide a plurality of degassing sections which can be charged with solid fuel independently of one another.
- the degassing device can also be arranged outside the furnace, but this requires additional equipment, for example to use the heat generated in the furnace to degas the solid fuel.
- the method according to the invention and systems for carrying out the method are further explained with the aid of a melting chamber furnace shown in FIG. 1 and a dry furnace shown in FIG.
- a furnace 1 according to the invention has a power combustion zone 2 and one or more downstream reduction zones 3.
- a degassing section 5 is arranged in the flue gas stream within the combustion plants 1. Fresh solid fuel is conveyed via line 6 into the degassing section 5, degassed there under the action of the thermal energy removed from the flue gas flowing around the degassing section 5, and the degassed solid fuel is fed via line 7 to the burners 8 of the power combustion zone 2 and burned there .
- the flue gases of the power combustion zone 2 are deflected by 180 ° C. and passed through a grate 4.
- the deflected flue gas stream then flows around a degassing section 5, which is arranged transversely to the direction of flow of the flue gases, and gives it to the latter the to Entga ⁇ of the solid fuel used required * solution from thermal energy.
- the reducing gas for the reduction zone 3 wherein a plurality of reduction zones 3 of the tion zone for the first Reduk ⁇ proportion required may dumieszone immediately above provided on the degassing section 5 gas outlets 10 in the Re ⁇ 3 can be initiated. Ren reduction zones 3 can also be provided own feeders 11.
- the reduction zone 3 is delimited in the flow direction of the flue gases by air supplied at 12 and any combustible reduction gases still present are combusted.
- Degassing section 5 is arranged in the flow direction of the flue gases, two reduction zones 3, 3a being provided.
- the solid fuel is supplied via line 6, 6a and the degassed solid fuel is burned in the burners 8 of the power combustion zone 2 with the addition of combustion air 14.
- the fuel gases obtained are introduced as reduction gases into the reduction zone 3, 3a.
- the reduction zones 3, 3a are limited by the supply of air 12, 12a.
- the degassing section 5 is arranged within the reduction zone, the solid fuel to be degassed being guided from top to bottom.
- the reducing gas passes over to the degassing section.
- the degassing section 5 can also (dotted line) extend beyond the area of the steam generator over the entire height of the furnace.
- the fuel is then added via line 6a.
- the degassing section 5 is arranged within the power combustion zone, the solid fuel to be degassed being led upwards from below.
- the gas generated is introduced into the reduction zone 3 via a feed 11. Any excess gas can be withdrawn via line 9.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Solid-Fuel Combustion (AREA)
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT87902408T ATE64986T1 (de) | 1986-04-29 | 1987-04-28 | Verfahren und anlage zur verringerung der stickoxidemission bei der verbrennung von mittel- und hochfluechtigen steinkohlen. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3614497 | 1986-04-29 | ||
| DE19863614497 DE3614497A1 (de) | 1986-04-29 | 1986-04-29 | Verfahren und anlage zur verringerung der stickoxidemission bei der verbrennung von festen brennstoffen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0267206A1 true EP0267206A1 (de) | 1988-05-18 |
| EP0267206B1 EP0267206B1 (de) | 1991-07-03 |
Family
ID=6299789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87902408A Expired - Lifetime EP0267206B1 (de) | 1986-04-29 | 1987-04-28 | Verfahren und anlage zur verringerung der stickoxidemission bei der verbrennung von mittel-und hochfluechtigen steinkohlen |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4981089A (de) |
| EP (1) | EP0267206B1 (de) |
| JP (1) | JPS63503240A (de) |
| AU (1) | AU596414B2 (de) |
| DE (2) | DE3614497A1 (de) |
| WO (1) | WO1987006677A1 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3934447C2 (de) * | 1989-02-16 | 1999-02-11 | Saarbergwerke Ag | Verfahren und Anlage zur Entgasung von festem Brennstoff in einem Wirbelschichtreaktor |
| DE3943084A1 (de) * | 1989-12-27 | 1991-07-04 | Saarbergwerke Ag | Verfahren zur verringerung der stickoxidemission bei der verfeuerung von festen brennstoffen |
| US5099771A (en) * | 1991-03-21 | 1992-03-31 | Disanto Sr Rocco J | Apparatus and process for the incineration of waste particles |
| SE503064C2 (sv) * | 1993-09-24 | 1996-03-18 | Gen Process Aa Ab | Sätt att utvinna energi genom förgasning, samt därför avsedd reaktor |
| DE10028394B4 (de) * | 2000-06-13 | 2008-12-04 | Herlt Sonnenenergiesysteme | Verfahren und Vorrichtung zum Vergasen großstückiger Festbrennstoffe, insbesondere Ballen aus Biomasse |
| US6497187B2 (en) | 2001-03-16 | 2002-12-24 | Gas Technology Institute | Advanced NOX reduction for boilers |
| JP3781706B2 (ja) | 2001-10-05 | 2006-05-31 | 川崎重工業株式会社 | 灰溶融型uファイアリング燃焼ボイラの運転方法 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB369340A (en) * | 1931-02-14 | 1932-03-24 | William Rogers | Improvements in or relating to the burning of pulverised fuel |
| GB647119A (en) * | 1943-11-11 | 1950-12-06 | David Dalin | Method of burning fuels |
| US4135874A (en) * | 1976-03-31 | 1979-01-23 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Two stage combustion furnace |
| JPS6020645B2 (ja) * | 1977-09-02 | 1985-05-23 | 株式会社日立製作所 | 固体炭化水素の燃焼処理方法 |
| DE2837174C2 (de) * | 1978-08-25 | 1986-02-20 | Vereinigte Kesselwerke AG, 4000 Düsseldorf | Verfahren und Vorrichtung zum Verfeuern eines schwer zündfähigen, gasarmen Brennstoffs mit trockenem Ascheabzug |
| US4231302A (en) * | 1979-05-14 | 1980-11-04 | Albert Neuhaus-Schwermann | Apparatus and process for burning of fuels of relatively young geological age and of any resulting gases |
| JPS56130513A (en) * | 1980-03-19 | 1981-10-13 | Mitsubishi Heavy Ind Ltd | Combustion with low nox |
| US4417528A (en) * | 1982-09-29 | 1983-11-29 | Mansfield Carbon Products Inc. | Coal gasification process and apparatus |
| DE3410945A1 (de) * | 1984-03-24 | 1985-10-03 | Steag Ag, 4300 Essen | Verfahren zur verminderung der no(pfeil abwaerts)x(pfeil abwaerts)-bildung in mit kohlenstaub betriebenen feuerungsanlagen, insbesondere schmelzkammerfeuerungen, und feuerungsanlage zur durchfuehrung des verfahrens |
| DE3413564A1 (de) * | 1984-04-11 | 1985-10-24 | Deutsche Babcock Werke AG, 4200 Oberhausen | Verfahren und vorrichtung zur verminderung des ausstosses von stickoxiden |
-
1986
- 1986-04-29 DE DE19863614497 patent/DE3614497A1/de not_active Withdrawn
-
1987
- 1987-04-28 WO PCT/DE1987/000186 patent/WO1987006677A1/de not_active Ceased
- 1987-04-28 AU AU73065/87A patent/AU596414B2/en not_active Ceased
- 1987-04-28 EP EP87902408A patent/EP0267206B1/de not_active Expired - Lifetime
- 1987-04-28 DE DE8787902408T patent/DE3771173D1/de not_active Expired - Lifetime
- 1987-04-28 JP JP62502641A patent/JPS63503240A/ja active Pending
-
1989
- 1989-08-08 US US07/391,730 patent/US4981089A/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8706677A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AU7306587A (en) | 1987-11-24 |
| EP0267206B1 (de) | 1991-07-03 |
| WO1987006677A1 (fr) | 1987-11-05 |
| DE3614497A1 (de) | 1987-11-05 |
| US4981089A (en) | 1991-01-01 |
| AU596414B2 (en) | 1990-05-03 |
| JPS63503240A (ja) | 1988-11-24 |
| DE3771173D1 (de) | 1991-08-08 |
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