EP0898688A1 - PROCESS FOR MINIMISING THE NOx CONTENT OF FLUE GASES - Google Patents
PROCESS FOR MINIMISING THE NOx CONTENT OF FLUE GASESInfo
- Publication number
- EP0898688A1 EP0898688A1 EP97923043A EP97923043A EP0898688A1 EP 0898688 A1 EP0898688 A1 EP 0898688A1 EP 97923043 A EP97923043 A EP 97923043A EP 97923043 A EP97923043 A EP 97923043A EP 0898688 A1 EP0898688 A1 EP 0898688A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- combustion
- combustion zone
- free space
- furnace
- flue gases
- 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
- 239000003546 flue gas Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000002485 combustion reaction Methods 0.000 claims abstract description 74
- 239000003245 coal Substances 0.000 claims abstract description 4
- 239000010813 municipal solid waste Substances 0.000 claims abstract description 4
- 239000010801 sewage sludge Substances 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 3
- 229910052756 noble gas Inorganic materials 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000010802 sludge Substances 0.000 abstract 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 9
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000006722 reduction reaction Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000010793 Steam injection (oil industry) Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000001914 calming effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
- F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
- F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
- F23G5/165—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber arranged at a different level
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/12—Sludge, slurries or mixtures of liquids
-
- 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
- F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
- F23L2900/07002—Injecting inert gas, other than steam or evaporated water, into the combustion chambers
-
- 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
- F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
- F23L2900/07009—Injection of steam into the combustion chamber
Definitions
- the invention relates to a method for operating incinerators for combustion goods such as sewage sludge, garbage or coal, in which the combustion material is burned in a combustion zone of the furnace and the resulting flue gases are extracted via a free space which is located above the combustion zone.
- a free space is a room with greatly reduced combustion. It serves to separate flue gases and dust as well as a small amount of post-combustion of CO and organic carbon and is also known as a calming room.
- a method of the type mentioned at the outset is known, for example, from DE 3703568 A1.
- a method for operating fluidized bed furnaces in which, for example, sewage sludge is burned in a fluidized bed which is located in the combustion zone of the fluidized bed furnace.
- the fluidized bed is produced in this process by using a mixture of combustion air and flue gases as the fluidized air, the flue gases being admixed to the combustion air in a temperature and quantity-controlled manner.
- the NO x concentration in the flue gas can be reduced. Nevertheless, a residual amount of NO x remains in the flue gas and therefore it is desirable in the context of environmental protection, especially air pollution control, to further reduce the NO x emissions.
- the invention was therefore based on the object of further reducing the NO x content in flue gases.
- the present object is therefore achieved by a method of the type mentioned at the outset, which is characterized in that the flue gases are set in a turbulent movement in the free space without the turbulence in the combustion zone being significantly increased thereby.
- the invention thus relates to a method for operating combustion furnaces for combustion goods such as sewage sludge, garbage or coal, in which the combustion material is burned in a combustion zone of the furnace and the resulting flue gases are drawn off via a free space located above the combustion zone characterized in that the flue gases are set in a turbulent movement in the free space, without thereby significantly increasing the turbulence in the combustion zone.
- the combustion itself can take place in one or two stages according to DE 3703568.
- Fluidized bed furnaces which have a fluidized bed in the firing zone, deck furnaces or rust furnaces can be used as combustion furnaces.
- the process is preferably suitable for the incineration of sewage sludge, since due to its protein content it can be expected that a lot of NO ⁇ will be burned.
- the turbulent movement of the flue gases is advantageously generated by injecting gas, preferably inert gas or noble gas, particularly preferably by injecting water vapor or nitrogen.
- Liquids or solids are also suitable for injection.
- the injection takes place advantageously in the free space above the firing zone, in such a way that the turbulence in the combustion zone or fluidized bed is not significantly, preferably not increased.
- the method is particularly suitable for incinerators with combustion zone areas greater than 5, preferably 40, particularly preferably 100 and very particularly preferably 200 m 2 .
- the invention also relates to an incinerator which has a combustion zone and a free space above the combustion zone, characterized in that the incinerator has means by which the flue gases in the free space can be set in turbulent motion without thereby significantly increasing the turbulence in the combustion zone becomes.
- This can be a fluidized bed furnace which has nozzles and / or flow disrupters in the free space above the fluidized bed. Baffles, for example, are suitable as flow disrupters.
- pipes that are installed for steam generation are also possible.
- NO ⁇ minimization through comparatively simple measures.
- secondary measures such as the SNCR or SCR process (Selective (Non-) Catalytic Reduction) are not required.
- the CO produced during combustion may act as a reducing agent, which is why it seems favorable not to reduce the CO formation in the fluidized bed.
- a reducing agent is also added.
- the pure water vapor is injected to increase the turbulence of the flue gases and this also improves the cross-mixing of the flue gases.
- the method according to the invention is also suitable for combustion furnaces with a low heat output down to 2000, even 1000 and even 500 kJ / (kg of fuel).
- the nitrogen contained in the sewage sludge is essentially converted to NH 3 , N 2 and to a small extent to fuel NO x in the fluidized bed.
- the N0 2 portion of total nitrogen is approximately 5%.
- Increasing the concentration of a reducing agent in the flue gas e.g. increasing the CO concentration
- increasing the residence time Improve turbulence and response speed
- Industrial sewage sludge 3 is burned in a two-stage fluidized bed furnace 1 with a combustion zone 2, in which the fluidized bed 11 is located.
- the combustion zone 2 with the fluidized bed 11 is located above an inflow floor 9 through which combustion air 7 is introduced into the fluidized bed 11 via an air distributor device (not shown).
- the sewage sludge 3 is burned in the fluidized bed 11 to reduce the fuel NO x formation at 0 2 contents in the combustion air 7 (primary air) of approximately 1% by volume.
- the resulting flue gases 1 2 enter a free space 4 above the fluidized bed and are withdrawn via this free space 4 and fed to a second combustion stage.
- the after-reaction zone 6 the CO formed by the reducing combustion conditions is afterburned by feeding in secondary air 8 to C0 2 (0 2 contents in the after-reaction zone> 6% by volume).
- the injection of Water vapor 10 takes place via one or more nozzles 5 directly into the free space 4.
- the turbulence of the fluidized bed 11 is not or only slightly influenced by this injection.
- the sewage sludge 3 is preferably added from above, from a height which ensures that the sewage sludge 3 is still dried while falling through the hot flue gases 4 into the fluidized bed 11.
- Sewage sludge feed rate approx. 10 t / h (40% dry substance)
- Flue gas quantity approx. 45000 Nm 3 / h (wet), approx. 35000 Nm 3 / h (dry)
- Fluid bed temperature 750 - 850 ° C
- NO x concentration in free space approx. 3000 mg / Nm 3
- Fluid bed furnace height 10.6 m
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Incineration Of Waste (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19619764A DE19619764C2 (en) | 1996-05-17 | 1996-05-17 | Process for minimizing the NO¶x¶ content in flue gases |
DE19619764 | 1996-05-17 | ||
PCT/EP1997/002389 WO1997044620A1 (en) | 1996-05-17 | 1997-05-09 | PROCESS FOR MINIMISING THE NOx CONTENT OF FLUE GASES |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0898688A1 true EP0898688A1 (en) | 1999-03-03 |
EP0898688B1 EP0898688B1 (en) | 2000-09-06 |
Family
ID=7794483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97923043A Expired - Lifetime EP0898688B1 (en) | 1996-05-17 | 1997-05-09 | PROCESS FOR MINIMISING THE NOx CONTENT OF FLUE GASES |
Country Status (14)
Country | Link |
---|---|
EP (1) | EP0898688B1 (en) |
JP (1) | JP2000510942A (en) |
KR (1) | KR20000011104A (en) |
CN (1) | CN1136412C (en) |
AR (1) | AR007146A1 (en) |
AT (1) | ATE196192T1 (en) |
AU (1) | AU2895497A (en) |
CO (1) | CO4700569A1 (en) |
DE (2) | DE19619764C2 (en) |
ID (1) | ID17426A (en) |
IL (1) | IL127051A0 (en) |
TW (1) | TW345610B (en) |
WO (1) | WO1997044620A1 (en) |
ZA (1) | ZA974260B (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6280694B1 (en) * | 1999-10-20 | 2001-08-28 | Studsvik, Inc. | Single stage denitration |
DE10021448A1 (en) | 2000-05-03 | 2001-11-08 | Messer Griesheim Gmbh | Method for burning organic waste involves passing fluidizising gas through waste in combustion chamber to produce fluidized particle layer whereby in free space above same the mean oxygen content is 0-3 percent by volume |
DE10051733B4 (en) * | 2000-10-18 | 2005-08-04 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Process for the gradual combustion of fuels |
JP2014500942A (en) | 2010-11-12 | 2014-01-16 | キャボット コーポレイション | Method and apparatus for reducing NOx emissions in exhaust gas incineration |
CN102788355B (en) * | 2012-08-23 | 2015-03-25 | 武汉都市环保工程技术股份有限公司 | Turbulent-style hazardous waste pyrolysis incinerator |
CN107448953A (en) * | 2017-09-16 | 2017-12-08 | 张文瀚 | A kind of fixed-end forces device |
FI128444B (en) | 2017-12-22 | 2020-05-15 | Valmet Technologies Oy | Method and apparatus for burning primary fuel |
CN110793043B (en) * | 2019-11-20 | 2021-03-12 | 上海华谊新材料有限公司 | System for incinerating high-salinity organic wastewater and wastewater treatment method |
CN112432183B (en) * | 2020-10-23 | 2021-12-14 | 清华大学 | Waste incineration coupling boiler system |
CN112696697B (en) * | 2020-12-28 | 2022-03-08 | 清华大学 | Laboratory organic waste liquid is real-time processing system on spot |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0172946B1 (en) * | 1984-08-28 | 1987-07-22 | Nederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO | Fluidised bed combustion apparatus |
DE3745179C2 (en) | 1987-02-06 | 2002-07-25 | Infraserv Gmbh & Co Hoechst Kg | Process for operating fluidized bed furnaces |
DE68917725T2 (en) * | 1988-10-20 | 1995-04-13 | Ebara Corp | COMBUSTION METHOD AND REGULATION METHOD THEREFOR. |
DE3839381A1 (en) * | 1988-11-22 | 1990-01-04 | Mrklas Louis | Vertically rotating fluidised-bed combustion for clinical waste, sewage sludge, pasty, dusty, liquid and granular waste matter |
DE4016894A1 (en) * | 1990-05-25 | 1991-12-05 | Hoelter Heinz | Redn. of carbon monoxide, nitrous oxide and sulphur di:oxide - involves expeller-eddy producer mixing flue gas with secondary and tertiary air |
DK0487052T3 (en) * | 1990-11-22 | 1997-03-17 | Hitachi Shipbuilding Eng Co | |
SE9100122D0 (en) * | 1991-01-15 | 1991-01-15 | Abb Carbon Ab | FLUIDIZED BOTTOM FLUID EQUIPMENT |
TW235335B (en) * | 1991-11-05 | 1994-12-01 | Mitsubishi Heavy Ind Ltd |
-
1996
- 1996-05-17 DE DE19619764A patent/DE19619764C2/en not_active Expired - Lifetime
-
1997
- 1997-05-09 KR KR1019980709263A patent/KR20000011104A/en not_active Application Discontinuation
- 1997-05-09 WO PCT/EP1997/002389 patent/WO1997044620A1/en not_active Application Discontinuation
- 1997-05-09 JP JP09541465A patent/JP2000510942A/en active Pending
- 1997-05-09 IL IL12705197A patent/IL127051A0/en unknown
- 1997-05-09 DE DE59702318T patent/DE59702318D1/en not_active Expired - Lifetime
- 1997-05-09 EP EP97923043A patent/EP0898688B1/en not_active Expired - Lifetime
- 1997-05-09 CN CNB971954070A patent/CN1136412C/en not_active Expired - Lifetime
- 1997-05-09 AU AU28954/97A patent/AU2895497A/en not_active Abandoned
- 1997-05-09 AT AT97923043T patent/ATE196192T1/en active
- 1997-05-15 TW TW086106489A patent/TW345610B/en not_active IP Right Cessation
- 1997-05-15 AR ARP970102039A patent/AR007146A1/en unknown
- 1997-05-15 ID IDP971625A patent/ID17426A/en unknown
- 1997-05-16 ZA ZA9704260A patent/ZA974260B/en unknown
- 1997-05-16 CO CO97026575A patent/CO4700569A1/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9744620A1 * |
Also Published As
Publication number | Publication date |
---|---|
TW345610B (en) | 1998-11-21 |
CO4700569A1 (en) | 1998-12-29 |
CN1221483A (en) | 1999-06-30 |
KR20000011104A (en) | 2000-02-25 |
ID17426A (en) | 1997-11-20 |
EP0898688B1 (en) | 2000-09-06 |
AU2895497A (en) | 1997-12-09 |
ZA974260B (en) | 1997-11-17 |
DE19619764C2 (en) | 2003-12-18 |
DE59702318D1 (en) | 2000-10-12 |
WO1997044620A1 (en) | 1997-11-27 |
AR007146A1 (en) | 1999-10-13 |
JP2000510942A (en) | 2000-08-22 |
DE19619764A1 (en) | 1997-11-20 |
IL127051A0 (en) | 1999-09-22 |
ATE196192T1 (en) | 2000-09-15 |
CN1136412C (en) | 2004-01-28 |
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