CN1817415A - Denitration of non-selective catalytic reducing smoke - Google Patents
Denitration of non-selective catalytic reducing smoke Download PDFInfo
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- CN1817415A CN1817415A CN 200610037684 CN200610037684A CN1817415A CN 1817415 A CN1817415 A CN 1817415A CN 200610037684 CN200610037684 CN 200610037684 CN 200610037684 A CN200610037684 A CN 200610037684A CN 1817415 A CN1817415 A CN 1817415A
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- catalyst
- selective catalytic
- fine breeze
- denitration
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Abstract
A non-selective catalytic reduction process for denitrating fume without spraying reducer includes such steps as controlling the excessive air coefficient of burner in boiler to 0.75-0.85, spraying burn-off air in it, regulating said excessive air coefficient to 1.05-1.15, spraying fine coal powder in it to obtain CO, H2 and hydrocarbon gas used as reducer, non-selective catalytic reduction reaction between NSCR catalyst and NOx in fume in the catalytic reactor, burning the residual CO gas under the action of oxidizing catalyst, and recovering its energy in preheater.
Description
Technical field
The present invention relates to a kind of reducing agent that need not spray into and realize the flue gas denitration catalyst reducing process, belong to the technical field of environmental protection equipment manufacturing and use.
Background technology
Nitrogen oxide (NO
x) be one of atmosphere major pollutants, its harm mainly contains acid rain effect, photochemical fog and other approach harm humans health and the ecological balance.And the coal-burning power plant is NO
xOne of primary pollution source.For with NO
xEmission control is in lower scope, and increasing coal-burning power plant adopts with ammonia (NH
3) realize denitrating flue gas SCR (SCR) technology for reducing agent.SCR is a kind of high efficiency flue-gas denitration process, but SCR technology all adopts NH usually
3As reducing agent, under the situation that catalyst exists with flue gas in NO
xCatalytic reduction reaction takes place, with NO
xBe reduced into free of contamination N
2But NH
3Itself be exactly a kind of expensive resources, and have certain explosivity, so all exist certain risk when transportation and storage, thermal power plant adopts with NH
3During for the SCR denitrating technique of reducing agent, must set up complicated NH
3Storage, supply and explosion protection system.Therefore, realize that with more economical, safer reducing agent the technology tool of flue gas denitration catalyst reduction has very important significance.
When fuel burnt in burner hearth, fuel can not reach desirable mixing with air, but phlogiston can not all be had an opportunity and oxygen molecule reacts in the fuel.For fuel can be burnt in burner hearth fully as far as possible, reduce the heat loss due to incomplete combustion, industrially actually send into air capacity in the burner hearth, so that combustion reaction is fully carried out having under the situation of unnecessary oxygen all greater than theoretical air requirement.The air capacity of effective supply and the ratio of theoretical air requirement are called excess air coefficient a.But when a increases, more heat will be taken out of burner hearth from boiler horizontal gas pass by flue gas, cause the increase of heat loss due to exhaust gas and the reduction of boiler thermal output, also cause NO simultaneously
xThe increase greatly of growing amount.For this reason, according to NO
xFormation mechanism and influence factor, can be by changing the air-supply air distribution mode, the control furnace air distributes, and realizes planned subregion burning, reduces and suppresses NO
xGrowing amount.Particularly, reduce the amount of combustion centre's oxygen, control excess air coefficient a＜1 makes combustion centre cause the anoxic of appropriateness, forms local reducing atmosphere, has also reduced the temperature levels of combustion zone, and this is for suppressing NO in this district
xGrowing amount obvious effects is arranged.Remaining air is sent on flame top as after-flame wind (or claiming top windward), makes fuel enter the burning of air excess district, though α＞1 at this moment, flame temperature is lower, also can not generate more NO in this district
x, total NO
xReduce.In furnace outlet excess air coefficient a generally in the scope at 1.15-1.25 (because of the difference of coal difference to some extent).
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of denitration of non-selective catalytic reducing smoke, this denitrating technique forms proper C O, H by coal dust firing in the boiler furnace
2With reducing gas such as hydro carbons,, utilize reducing gas and NO at boiler tail
xNSCR (non-selective catalytic reduction reaction) control NO
xDischarging.
Technical scheme: non-selective catalytic reduction flue gas denitration device of the present invention is in series by boiler furnace, horizontal flue, back-end ductwork, catalytic reactor and constitutes, burner, after-flame wind inlet, fine breeze entrance in boiler furnace, have been disposed in order from bottom to top, be provided with NSCR catalyst layer and layer of oxidation catalyst in the catalytic reactor at back-end ductwork rear portion, oxidation catalyst is arranged in the downstream of NSCR catalyst.
The method of denitration of non-selective catalytic reduction flue gas denitration device of the present invention is: O.75-0.85 the excess air coefficient at boiler-burner place is controlled at, after-flame wind inlet sprays into after-flame wind, and excess air factor adjusted to 1.05-1.15, add fine breeze to obtain CO, H2 and hydrocarbon gas at the fine breeze entrance then as reducing agent; In catalytic reactor, NO in NSCR catalyst and the flue gas
xNon-selective catalytic reduction reaction takes place, also do not have gases such as CO oxidation after-flame under oxidation catalyst effect thereafter of having reacted, its energy reclaims in air preheater.Produce for temperature and local atmosphere in the stove that makes fine breeze entrance present position just in time help reducibility gas, the fine breeze that adds at the fine breeze entrance is controlled at 0.01%～0.2% of total amount of fuel.
When fuel during in the boiler furnace internal combustion, by the control technology of precision, the control furnace air distributes, and realizes planned subregion burning, reduces and suppresses NO
xGrowing amount; Simultaneously, under certain reducing atmosphere, form proper C O, H with coal dust firing
2With reducing gas such as hydro carbons.At the afterbody of boiler, gas that these are remaining and the NO in the flue gas
xCarry out the NSCR reaction, generate nontoxic CO
2And N
2, NO the most at last
xBe controlled at a lower level.In order to control the CO content that enters in the atmosphere, NSCR catalyst arranged downstream layer of oxidation catalyst does not participate in the reducibility gas such as CO that react to remove minute quantity.
Beneficial effect: the present invention need not spray into reducing agent and realize the non-selective catalytic reduction of denitrating flue gas,
1. this technology obtains CO, H with lower cost
2With reducing gas such as hydro carbons, with replace costing an arm and a leg, 2. accumulating complexity, explosive NH
3As reducing agent, saved complicated NH
3Storage and transportation system, greatly reduce the operating cost of flue gas denitrification system, realize cheaper flue-gas denitration process.
2. by reducing excess air coefficient a, NO in the stove
xGrowing amount can reduce 25-40%, reduced the boiler exhaust gas heat loss simultaneously, improved boiler thermal output.
3. NO
xThe reduction of growing amount can reduce catalyst consumption, reduces the pressure drop that flue gas denitrification system causes, and need not consider SO
2To SO
3Conversion.
4. replaced NH
3As reducing agent, hardly with considering the influence of reducing agent and catalytic reduction reaction to the unit upstream device.
Description of drawings
Fig. 1 is the general structure schematic diagram of the non-selective catalytic reduction flue gas denitration device of the present invention.Have among the figure: boiler furnace 1, horizontal flue 2, back-end ductwork 3, burner 4, after-flame wind inlet 5, fine breeze entrance 6, NSCR catalyst 7, oxidation catalyst 8.
The specific embodiment
The present invention is further described below in conjunction with accompanying drawing.
This denitrification apparatus is in series and is constituted by boiler furnace 1, horizontal flue 2, back-end ductwork 3, catalytic reactor 9, burner 4, after-flame wind inlet 5, fine breeze entrance 6 in boiler furnace 1, have been disposed in order from bottom to top, be provided with 8 layers of 7 layers of NSCR catalyst and oxidation catalysts in the catalytic reactor 9 at back-end ductwork 3 rear portions, oxidation catalyst 8 is arranged in the downstream of NSCR catalyst 7.Fuel is in boiler furnace 1 internal combustion, add 100% required fuel of coal-fired unit in burner 4 positions, add the required equivalent air coefficient of 0.75-85% fuel according to concrete coal (mainly assigning to distinguish) simultaneously according to volatilization, all the other the required air quantity that burn add at after-flame wind 5 places that enter the mouth, and imperfect combustion carbon divides with carbon contained in the part flying dust and burns away under after-flame wind condition.Different with traditional fractional combustion, the present invention is by the advanced burner and the control technology of precision, total excess air coefficient a is controlled at the level that reduces 0.05-0.1 than traditional value, but guarantees that simultaneously the phlogiston and the phosphorus content in the flying dust that have neither part nor lot in reaction in the fuel are controlled in the acceptable scope.Add the fine breeze of minute quantity at fine powder entrance 6 places, its total amount is according to combustion conditions and NO
xGrowing amount determine that account for 0.1% of total amount of fuel greatly, under the lower condition of total excess air coefficient, fine powder mainly generates gases such as CO, H2 and hydro carbons.Because coal dust is thinner, and amount seldom, so the machinery heat that this part fuel produced
Lose very low.With gases such as the CO, the H2 that produce and hydro carbons as reducing agent, at boiler tail 3 and since in the flue gas oxygen content seldom, so under the effect of catalyst, the NO in the flue gas
xWith reducing agent non-selective catalytic reduction reaction taking place, generates nitrogen, carbon dioxide and water etc.Because reducing gas such as CO and NO exist simultaneously in flue gas, such reduction reaction is killed two birds with one stone, and removes NO and CO simultaneously.If CO residue is arranged,, stop gas such as remaining CO to enter atmosphere again at lower disposed one deck oxidation catalyst 8 of NSCR catalyst 7.
Claims (2)
1. denitration of non-selective catalytic reducing smoke, it is characterized in that the used denitrification apparatus of this technology is by boiler furnace (1), horizontal flue (2), back-end ductwork (3), catalytic reactor (9) formation that is in series, burner (4), after-flame wind inlet (5), fine breeze entrance (6) in boiler furnace (1), have been disposed in order from bottom to top, be provided with non-selective catalytic reduction reaction catalyst (7) layer and oxidation catalyst (8) layer in the catalytic reactor (9) at back-end ductwork (3) rear portion, oxidation catalyst (8) is arranged in the downstream of NSCR catalyst (7); The excess air coefficient that boiler-burner (4) is located is controlled at 0.75-0.85, after-flame wind inlet (5) sprays into after-flame wind, and excess air factor adjusted to 1.05-1.15, add fine breeze to obtain CO, H2 and hydrocarbon gas at fine breeze entrance (6) then as reducing agent; In catalytic reactor (9), NO in NSCR catalyst (7) and the flue gas
xNon-selective catalytic reduction reaction takes place, also do not have the gases such as CO that reacted oxidation after-flame under oxidation catalyst (8) effect thereafter, its energy reclaims in air preheater.
2. denitration of non-selective catalytic reducing smoke according to claim 1, it is characterized in that: produce for temperature and local atmosphere in the stove that makes fine breeze entrance (6) present position just in time help reducibility gas, the fine breeze that adds at fine breeze entrance (6) is controlled at 0.01%～0.2% of total amount of fuel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610037684 CN1817415A (en) | 2006-01-10 | 2006-01-10 | Denitration of non-selective catalytic reducing smoke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610037684 CN1817415A (en) | 2006-01-10 | 2006-01-10 | Denitration of non-selective catalytic reducing smoke |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1817415A true CN1817415A (en) | 2006-08-16 |
Family
ID=36917740
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610037684 Pending CN1817415A (en) | 2006-01-10 | 2006-01-10 | Denitration of non-selective catalytic reducing smoke |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103055694A (en) * | 2011-10-21 | 2013-04-24 | 中国石油化工股份有限公司 | Method for flue gas denitrification by organic waste gas |
| CN104174265A (en) * | 2014-08-12 | 2014-12-03 | 凌庭生 | Method for reducing NOx in high-temperature calcination by SCR denitration technology adopting carbon-series reduction agent. |
| CN106838888A (en) * | 2017-01-23 | 2017-06-13 | 北京联力源科技有限公司 | Combustion system and its operation method |
| CN108452674A (en) * | 2018-04-12 | 2018-08-28 | 陕西大秦环保设备有限公司 | A kind of efficient control device and method of gas fired-boiler nitrogen oxides |
| CN109338052A (en) * | 2018-09-29 | 2019-02-15 | 中冶南方（武汉）热工有限公司 | Reduce the radiant tube exhaust system and method for discharged nitrous oxides |
| CN111503645A (en) * | 2019-01-31 | 2020-08-07 | 中国科学院工程热物理研究所 | Flue gas denitration process and flue gas denitration device |
-
2006
- 2006-01-10 CN CN 200610037684 patent/CN1817415A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103055694A (en) * | 2011-10-21 | 2013-04-24 | 中国石油化工股份有限公司 | Method for flue gas denitrification by organic waste gas |
| CN103055694B (en) * | 2011-10-21 | 2015-08-12 | 中国石油化工股份有限公司 | A kind of method utilizing organic exhaust gas to carry out denitrating flue gas |
| CN104174265A (en) * | 2014-08-12 | 2014-12-03 | 凌庭生 | Method for reducing NOx in high-temperature calcination by SCR denitration technology adopting carbon-series reduction agent. |
| CN106838888A (en) * | 2017-01-23 | 2017-06-13 | 北京联力源科技有限公司 | Combustion system and its operation method |
| CN106838888B (en) * | 2017-01-23 | 2023-10-13 | 北京联力源科技有限公司 | Combustion system and method of operating the same |
| CN108452674A (en) * | 2018-04-12 | 2018-08-28 | 陕西大秦环保设备有限公司 | A kind of efficient control device and method of gas fired-boiler nitrogen oxides |
| CN109338052A (en) * | 2018-09-29 | 2019-02-15 | 中冶南方（武汉）热工有限公司 | Reduce the radiant tube exhaust system and method for discharged nitrous oxides |
| CN111503645A (en) * | 2019-01-31 | 2020-08-07 | 中国科学院工程热物理研究所 | Flue gas denitration process and flue gas denitration device |
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