CN202893192U - High-temperature dustproof SCR (Selective Catalytic Reduction) denitration device for cement kiln smoke - Google Patents

High-temperature dustproof SCR (Selective Catalytic Reduction) denitration device for cement kiln smoke Download PDF

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Publication number
CN202893192U
CN202893192U CN 201220619005 CN201220619005U CN202893192U CN 202893192 U CN202893192 U CN 202893192U CN 201220619005 CN201220619005 CN 201220619005 CN 201220619005 U CN201220619005 U CN 201220619005U CN 202893192 U CN202893192 U CN 202893192U
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China
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scr
cement kiln
flue gas
catalyst
temperature
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Expired - Fee Related
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CN 201220619005
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Chinese (zh)
Inventor
张志刚
刘科
王彬
吴飞
李金虎
王成勇
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JIANGSU CNBM ENVIRONMENTAL PROTECTION RESEARCH INSTITUTE Co Ltd
China Triumph International Engineering Co Ltd
Shenzhen Triumph Technology Engineering Co Ltd
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JIANGSU CNBM ENVIRONMENTAL PROTECTION RESEARCH INSTITUTE Co Ltd
China Triumph International Engineering Co Ltd
Shenzhen Triumph Technology Engineering Co Ltd
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Priority to CN 201220619005 priority Critical patent/CN202893192U/en
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Abstract

The utility model relates to a high-temperature dustproof SCR (Selective Catalytic Reduction) denitration device for cement kiln smoke. The high-temperature dustproof SCR denitration device is characterized by comprising an electric dust remover (2) which is communicated with a cement kiln pre-heater (1); an output end of the electric dust remover (2) is communicated with a mixer (3) through a pipeline; the mixer (3) is provided with a compressed air inlet (4), a reducing agent inlet (5) and a reducing agent spraying gun (31); an output end of the mixer (3) is communicated with an SCR reactor (61) though a pipeline; the SCR reactor (61) is internally provided with a catalyst (62); and an output end of the SCR reactor (61) is provided with a pressurizing fan (8) for discharging purified smoke into downstream equipment. The high-temperature dustproof SCR denitration device of the cement kiln smoke has the beneficial effects that high-temperature smoke is firstly subjected to dust falling treatment through the high-temperature electric dust remover to effectively prevent fly ash from abrading, blocking and inactivating the SCR catalyst; and meanwhile, CaO grains in the cement kiln smoke can be removed, the blocking of catalyst micro-pores caused by the CaO grains is avoided, and the blocking of the catalyst by CaSO4 generated by an SO3 reaction is avoided.

Description

Cement kiln flue gas high-temperature dust removal SCR denitrification apparatus
Technical field
The utility model relates to flue gas processing device, relates in particular to a kind of cement kiln flue gas high-temperature dust removal SCR denitrification apparatus.
Background technology
In the cement production process, the in service of preheater and dore furnace can produce a large amount of dust and flue gas, and NO in the kiln discharge flue gas xContent at 600 ~ 1600mg/Nm 3About, and dust content is higher.NO xBe a kind of gas that can cause the atmospheric environment severe contamination, be considered to one of primary pollution source of atmosphere pollution and acid rain.The fast development of China's economy has also brought the fast development of building material industry, according to statistics, and the NO of cement industry xTotal amount has been another the main NO that occupies outside the thermal power generation xThe disposal of pollutants source.
Along with China enters " 12 " period, country is with NO xDischarge capacity include in the Target of Total Pollutant Amount Control pollutant, and implement " cement industry atmosphere pollutants emission standards " (GB4915-2004) from January 1st, 2005, wherein the grinding integrated NO of clear cement kiln and kiln xThe concentration of emission limit value is 800mg/Nm 3, the discharge capacity limit value is 2.4kg/t (product).Present stage, the discharge standard requirement all can not be satisfied in most cement plant, so the need to be resolved hurrily problem of NO_x Reduction by Effective of cement industry.
At present, the production method of new type nonaqueous cement is promoted gradually, is used for the dry method cement rotary kiln flue gas and removes NO xControl technology, mainly contain SNCR method (SNCR) and selective catalytic reduction (SCR).The SNCR method is take urea or weak aqua ammonia as reducing agent, and it is sprayed into fire box temperature is 800 ~ 1250 ℃ zone, the NH that evaporates rapidly 3With the NO in the flue gas xReaction generates N 2And H 2O.The SNCR method is not owing to needing catalyst, and simple and convenient operation and maintenance, and cost of investment is lower and be used widely.But because its denitration efficiency is lower, and system's temperature influence is larger, and denitration efficiency is unstable, thereby cancels gradually single use pattern.The SCR method refers to utilize reducing agent (such as NH under the condition of catalyst and oxygen existence 3, H 2, CO or hydrocarbon etc.) selectively with NO xBe catalysed and reduced into N 2And H 2The method of O.The SCR law technology is ripe, and denitration efficiency is high, thereby the large coal-fired boiler denitrating flue gas is most widely used at present is exactly the SCR technology, and in the system that has moved, denitration efficiency reaches more than 80% ~ 90%, NH 3Escape generally below 5ppm, be one of the technology that can satisfy the environmental requirement of increasingly stringent.
The SCR method that the denitrating flue gas of coal fired boiler of power plant adopts does not generally need preposition hot electrostatic precipitator, and smoke content is 20 ~ 40g/Nm approximately 3Flue gas directly enter the SCR Benitration reactor.But smoke content is up to 60 ~ 100 g/Nm in the flue gas of cement plant 3, CaO content is up to about 40%.The CaO dust can cause the obstruction of catalyst micropore, simultaneously with flue gas in SO 3The CaSO that reaction generates 4Catalyst surface is stopped up.If therefore high ash-laden gas directly enters the SCR reactor, can greatly reduce the service life of catalyst.Simultaneously high cloud of dust gas enters the access times that will increase soot blower system behind the SCR reactor, increase system power consumption.
The utility model content
The purpose of this utility model is exactly for a kind of cement kiln flue gas high-temperature dust removal SCR denitrification apparatus being provided, reducing cement kiln flue gas NO xThe discharging of pollutant further extending catalyst service life, reduces system power consumption and reducing agent consumption, improves the reliable, stable of SCR denitrating system, saves system operation cost.
The technical scheme that its technical problem that solves the utility model adopts is:
Cement kiln flue gas high-temperature dust removal SCR denitrification apparatus, it is characterized in that: comprise the preheater that is connected with the cement kiln flue gas pipeline, the output of preheater is connected with electric cleaner by pipeline, the output of electric cleaner is connected with blender by pipeline, blender is provided with the reducing agent spray gun, the output of blender is connected with the SCR reactor by pipeline, is provided with catalyst in the SCR reactor, and the flue gas that SCR reactor output will be provided with after booster fan will purify enters upstream device.
On the basis of above-mentioned main technical schemes, can increase following further perfect technical scheme:
Be provided with soot blower in the described SCR reactor.
The connecting pipe of described preheater and electric cleaner is provided with flashboard.
Between cement kiln preheaters output and booster fan outlet by-pass flue is set, by-pass flue is provided with flue shutter.
Described preheater adopts five-stage cyclone preheater.
Described electric cleaner adopts hot electrostatic precipitator.
The beneficial effects of the utility model:
(1) flue gas at first carries out dust removal process by hot electrostatic precipitator, can effectively avoid flying dust that the SCR catalyst is caused wearing and tearing, obstruction and inactivation; Remove simultaneously the CaO particle in the cement kiln flue gas, avoid the CaO particle itself to cause obstruction and and the SO of catalyst micropore 3The CaSO that reaction generates 4The obstruction that catalyst is caused;
(2) flue gas is through after the dust removal process, and the smoke content that enters the SCR reactor reduces greatly, can reduce the frequency of utilization of catalyst soot blower, reduces system power consumption, saves operating cost.
(3) after cement kiln flue gas was processed through the SCR method that contains preposition electric precipitation, the denitration rate was not less than 85%, NO in the flue gas after purifying xContent be not more than 150mg/Nm 3, the denitrification apparatus availability is not less than 95%.
Below in conjunction with drawings and Examples the present invention/utility model is further specified.
Description of drawings:
Fig. 1 is front view of the present utility model.
The specific embodiment
As shown in Figure 1, the utility model cement kiln flue gas high-temperature dust removal SCR denitrification apparatus, comprise the electric cleaner 2 that is connected with cement kiln five-stage cyclone preheater 1, electric cleaner 2 systems adopt hot electrostatic precipitator (ESP), follow-up denitrating catalyst is caused the dust of adverse effect with the CaO particle of removing flue gas and other, thereby guarantee the reliably and with long-term stable operation of cement plant kiln exit gas SCR denitrating system; The collecting plate of electric cleaner 2 adopts exotic material, and structural design takes into full account thermal expansion, and the distortion that can effectively avoid high temperature to cause guarantees deduster service life; Hot electrostatic precipitator can be 300 ~ 400 ℃ of reliably and with long-term stable operations, and maximum operation (service) temperature is 450 ℃.Described preheater 1 is provided with flashboard 9 with the connecting pipe of electric cleaner 2, the output of electric cleaner 2 is connected with blender 3 by pipeline, blender 3 adopts the agent of pressurized with compressed air injection reduction, flue gas after dedusting fully mixes by blender 3 with the reducing agent that sprays into, the output of blender 3 is connected with SCR reactor 61 by pipeline, SCR reactor 61 is by rationally, unique Optimum Design of Flow, flue gas and SCR denitrification reducing agent are mixed fully rapidly, thereby reach the highest denitration efficiency and minimum the escaping of ammonia rate with minimum reducing agent and catalyst amount, be provided with catalyst 62 and soot blower 7 in the SCR reactor 61, the flue gas that SCR reactor 61 outputs will be provided with after booster fan 8 will purify enters upstream device.
Between cement kiln preheaters 1 output and booster fan 8 outlets by-pass flue 10 is set, by-pass flue 10 is provided with flue shutter 11.
Its implementation route is: open flashboard 9, flue gas at first enters hot electrostatic precipitator 2 by five-stage cyclone preheater 1 outlet, the reducing agent that high-temperature flue gas after dedusting and reducing agent entrance inject also sprays into blender 3 by the pressurized with compressed air that compressed air inlet 4 enters, mixed flue gas enters SCR reactor 61, by catalyst 62, the catalyst top arranges soot blower 7, and catalyst is cleaned; Final clean flue gas enters upstream device through booster fan 8, has reduced the dust content that enters in the SCR system flue gas by preposition dust arrester, improves the SCR denitrating system reliable, stable, improves system's availability.Plant maintenance and the operating cost of whole system are lower, meet national energy-saving fully and reduce discharging policy.

Claims (5)

1. cement kiln flue gas high-temperature dust removal SCR denitrification apparatus, it is characterized in that: comprise the electric cleaner (2) that is connected with cement kiln preheaters (1) exhanst gas outlet, the output of electric cleaner (2) is connected with blender (3) by pipeline, blender (3) is provided with compressed air inlet (4), reducing agent entrance (5) and reducing agent spray gun (31), the output of blender (3) is connected with SCR reactor (61) by pipeline, be provided with catalyst (62) in the SCR reactor (61), the flue gas that SCR reactor (61) output will be provided with after booster fan (8) will purify enters upstream device.
2. cement kiln flue gas high-temperature dust removal SCR denitrification apparatus according to claim 1 is characterized in that: be provided with soot blower (7) in the described SCR reactor (61).
3. cement kiln flue gas high-temperature dust removal SCR denitrification apparatus according to claim 1 and 2 is characterized in that: described preheater (1) is provided with flashboard (9) with the connecting pipe of electric cleaner (2).
4. cement kiln flue gas high-temperature dust removal SCR denitrification apparatus according to claim 3, it is characterized in that: between cement kiln preheaters (1) output and booster fan (8) outlet by-pass flue (10) is set, by-pass flue (10) is provided with flue shutter (11).
5. cement kiln flue gas high-temperature dust removal SCR denitrification apparatus according to claim 1 and 2 is characterized in that: described electric cleaner (2) employing hot electrostatic precipitator.
CN 201220619005 2012-11-21 2012-11-21 High-temperature dustproof SCR (Selective Catalytic Reduction) denitration device for cement kiln smoke Expired - Fee Related CN202893192U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102921297A (en) * 2012-11-21 2013-02-13 江苏中建材环保研究院有限公司 SCR denitrification device for dedusting smoke of cement kiln at high temperature
CN103816785A (en) * 2014-02-24 2014-05-28 张亚玉 Flue gas purifier and purifying method thereof
CN105854537A (en) * 2016-05-09 2016-08-17 清华大学 Industrial furnace sulfur trioxide pre-removing and denitration device and method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102921297A (en) * 2012-11-21 2013-02-13 江苏中建材环保研究院有限公司 SCR denitrification device for dedusting smoke of cement kiln at high temperature
CN103816785A (en) * 2014-02-24 2014-05-28 张亚玉 Flue gas purifier and purifying method thereof
CN105854537A (en) * 2016-05-09 2016-08-17 清华大学 Industrial furnace sulfur trioxide pre-removing and denitration device and method
CN105854537B (en) * 2016-05-09 2019-05-07 清华大学 A kind of industrial furnace removes sulfur trioxide and denitrification apparatus and method in advance

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Granted publication date: 20130424

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