CN204543995U - A kind of cement kiln end low-temperature smoke air SCR denitrification apparatus - Google Patents

A kind of cement kiln end low-temperature smoke air SCR denitrification apparatus Download PDF

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Publication number
CN204543995U
CN204543995U CN201520180359.1U CN201520180359U CN204543995U CN 204543995 U CN204543995 U CN 204543995U CN 201520180359 U CN201520180359 U CN 201520180359U CN 204543995 U CN204543995 U CN 204543995U
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China
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low
cement kiln
temperature
kiln end
dust
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Expired - Fee Related
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CN201520180359.1U
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Chinese (zh)
Inventor
廖玉云
曹宗平
毛志伟
程群
甘昊
邓飞飞
王梦瑜
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Hefei Cement Research and Design Institute Co Ltd
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Hefei Cement Research and Design Institute Co Ltd
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Abstract

The utility model discloses a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus, comprise cement kiln end dust-precipitator, reductant supply system, injection of reducing agent injection device, low-temperature denitration device, catalyst, cement kiln end tail exhaust blower and chimney.After denitrification apparatus is arranged in cement kiln end dust-precipitator, purifying smoke after kiln tail dust-precipitator gathers dust, to supply with reductant supply system, injection of reducing agent injection device before being arranged in low-temperature denitration device on flue is injected into reducing agent in flue together, enter after mixing on the flue before being disposed to cement kiln end tail exhaust blower entrance after the middle temperature denitrification apparatus that catalyst is housed carries out denitration, final purification flue gas enters kiln tail chimney and discharges.The utility model cement kiln end height cloud of dust gas is successively after kiln tail dust-precipitator carries out gathering dust process, and flue-gas temperature is low, and dust content is very low, effectively can avoid flue dust washing away, wear and tear and blocking catalyst after now entering low-temperature denitration device.

Description

A kind of cement kiln end low-temperature smoke air SCR denitrification apparatus
Technical field
The utility model relates to denitrating flue gas field, specifically a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus.
Background technology
At present, the discharge of China's cement industry nitrogen oxide accounts for about 10% of total release, is the third-largest discharged nitrous oxides source of China.National airborne release Target of Total Pollutant Amount Control during NOx lists in " 12 ", one of cement furnace denitration keypoint treatment field becoming environmental protection.Regulation in " cement industry atmosphere pollutants emission standards " (GB4915-2013) of up-to-date promulgation: newly-built enterprise rises on March 1st, 2014, and existing enterprise rises on July 1st, 2015, performs kiln tail NOx emission concentration and is not more than 400mg/Nm 3regulation, key area performs NOx emission concentration and is not more than 320mg/Nm 3regulation.Present stage, most of cement production enterprise all can not meet the emission request that standard specifies, therefore, cement industry is badly in need of solving NOx emission concentration problem not up to standard.
Be applied to the restriction of SCR technology (SCR) by catalyst of cement industry, many employings high-temperature high dust method for arranging, the high-temperature high dust flue gas exported by preheater C1 introduces SCR reactor, and temperature is 300 ~ 350 DEG C of scopes herein, is the best serviceability temperature scope of high temperature catalyst; Because now flue-gas temperature is high, dust content is up to 80 ~ 120g/Nm 3, and in flue dust, CaO content is high, easily causes catalyst poisoning and blocking, and it is short for service life that the SCR denitration device be arranged in herein exists catalyst, and catalyst easily blocks and inactivation, the problem such as the operation and maintenance cost of denitrification apparatus is high.Simultaneously because the SCR denitration device arranged downstream be arranged in herein has surplus heat the facilities such as electricity generation boiler, if the escaping of ammonia of SCR denitration system controls improper, also easily cause the bad problem of degradation under the blocking of waste heat boiler, corrosion and the thermal efficiency.
At present, research to low temperature catalyst both domestic and external is a lot, publication number is the preparation method that the Chinese utility model patents such as 102962055,101879452,103143346 disclose several low temperature catalyst, for the practicality of the cement kiln low-temperature denitration of flue gas device based on low temperature catalyst provides strong support.
utility model contentthe purpose of this utility model is to provide a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus, to solve short, the problem such as denitrification apparatus operation and maintenance cost is high in catalyst service life that prior art exists.
In order to achieve the above object, the technical scheme that the utility model adopts is:
A kind of cement kiln end low-temperature smoke air SCR denitrification apparatus, it is characterized in that: comprise kiln tail dust-precipitator, the reductant supply system of supply reducing agent, low-temperature denitration device, the exhanst gas outlet of described kiln tail dust-precipitator, the outlet of reductant supply system closes respectively by pipeline the entrance that road is communicated to an injection of reducing agent injection device, described low-temperature denitration device top is provided with import, low-temperature denitration bottom of device is provided with outlet, low-temperature denitration device is built with multi-layer catalyst, the outlet of described injection of reducing agent injection device is communicated with low-temperature denitration device top inlet by pipeline, the outlet of low-temperature denitration bottom of device is by pipeline communication to cement kiln end tail exhaust blower entrance, the outlet of cement kiln end tail exhaust blower is communicated with outside kiln tail chimney by pipeline, the exhanst gas outlet of kiln tail dust-precipitator also by pipeline communication to cement kiln end tail exhaust blower entrance.
Described a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus, is characterized in that: establish by soot blower in described low-temperature denitration device.
Described a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus, is characterized in that: described soot blower is acoustic wave ash ejector or compressed air soot-blowing device.
Described a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus, is characterized in that: described injection of reducing agent injection device is for spraying grid or fixed spray gun.
Described a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus, is characterized in that: the reducing agent of described reductant supply system supply is ammoniacal liquor or urea liquid.
Described a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus, it is characterized in that: described catalyst is low temperature catalyst, serviceability temperature scope is 80 ~ 150 DEG C.
Described a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus, is characterized in that: the pipeline that described kiln tail dust-precipitator is connected with injection of reducing agent injection device is provided with butterfly valve.
Described a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus, is characterized in that: the pipeline that described low-temperature denitration device is connected with cement kiln end tail exhaust blower is provided with butterfly valve.
Described a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus, is characterized in that: the pipeline that the exhanst gas outlet of described kiln tail dust-precipitator is connected with cement kiln end tail exhaust blower is provided with butterfly valve.
After the utility model denitrification apparatus is arranged in kiln tail dust-precipitator, purifying smoke after kiln tail dust-precipitator gathers dust, to supply with reductant supply system, the injection of reducing agent injection device be arranged on low-temperature denitration device preceding pipeline is injected into reducing agent in pipeline together, enter after mixing on the pipeline before being disposed to cement kiln end tail exhaust blower entrance after the middle low temperature temperature denitrification apparatus that catalyst is housed carries out denitration, final purification flue gas enters kiln tail chimney and discharges.
The utility model has the advantages that: cement kiln end height cloud of dust gas is successively after kiln tail dust-precipitator carries out gathering dust process, and flue-gas temperature is low, and dust content is low to moderate 30g/Nm 3below, after now entering low-temperature denitration device, flue dust washing away, wear and tear and blocking catalyst effectively can be avoided, thus the service life of extending catalyst; Reduce frequency of utilization and the system failure rate of soot blower, thus reduce the operation and maintenance cost of denitrating system.
Accompanying drawing explanation
Fig. 1 is the utility model low temperature SCR denitration apparatus structure schematic diagram.
Detailed description of the invention
As shown in Figure 1, a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus, comprise kiln tail dust-precipitator 1, the reductant supply system 2 of supply reducing agent, low-temperature denitration device 4, the exhanst gas outlet of kiln tail dust-precipitator 1, the outlet of reductant supply system 2 closes respectively by pipeline the entrance that road is communicated to an injection of reducing agent injection device 3, low-temperature denitration device 4 top is provided with import, outlet is provided with bottom low-temperature denitration device 4, low-temperature denitration device 4 is built with multi-layer catalyst 5, the outlet of injection of reducing agent injection device 3 is communicated with low-temperature denitration device 4 top inlet by pipeline, low-temperature denitration device 4 outlet at bottom is communicated to cement kiln end tail exhaust blower 11 entrance by pipeline 10, cement kiln end tail exhaust blower 11 is exported and is communicated with outside kiln tail chimney 12 by pipeline, the exhanst gas outlet of kiln tail dust-precipitator 1 also by pipeline communication to cement kiln end tail exhaust blower 11 entrance.
Establish by soot blower 6 in low-temperature denitration device 4.
Soot blower 6 is acoustic wave ash ejector or compressed air soot-blowing device.
Injection of reducing agent injection device 3 is for spraying grid or fixed spray gun.
The reducing agent that reductant supply system 2 is supplied is ammoniacal liquor or urea liquid.
Catalyst 5 is low temperature catalyst, and serviceability temperature scope is 80 ~ 150 DEG C.
The pipeline that kiln tail dust-precipitator 1 is connected with injection of reducing agent injection device 3 is provided with butterfly valve 7.
The pipeline that low-temperature denitration device 4 is connected with cement kiln end tail exhaust blower 11 is provided with butterfly valve 8.
The pipeline that the exhanst gas outlet of kiln tail dust-precipitator 1 is connected with cement kiln end tail exhaust blower 11 is provided with butterfly valve 9.
After low-temperature denitration device 4 is arranged in cement kiln end dust-precipitator 1, the purifying smoke after kiln tail dust-precipitator 1 gathers dust, its temperature is about about 100 DEG C, and dust content is lower than 30g/Nm 3with to be supplied by reductant supply system 2, injection of reducing agent injection device 3 reducing agent be injected in flue before being arranged in low-temperature denitration device 4 on flue is mixed together evenly, enter after the low-temperature denitration device 4 that catalyst 5 is housed carries out denitration reaction, purifying smoke is disposed on the flue 10 before cement kiln end tail exhaust blower 11 entrance, finally enters kiln tail chimney 12 and discharges.

Claims (9)

1. a cement kiln end low-temperature smoke air SCR denitrification apparatus, it is characterized in that: comprise kiln tail dust-precipitator, the reductant supply system of supply reducing agent, low-temperature denitration device, the exhanst gas outlet of described kiln tail dust-precipitator, the outlet of reductant supply system closes respectively by pipeline the entrance that road is communicated to an injection of reducing agent injection device, described low-temperature denitration device top is provided with import, low-temperature denitration bottom of device is provided with outlet, low-temperature denitration device is built with multi-layer catalyst, the outlet of described injection of reducing agent injection device is communicated with low-temperature denitration device top inlet by pipeline, the outlet of low-temperature denitration bottom of device is by pipeline communication to cement kiln end tail exhaust blower entrance, the outlet of cement kiln end tail exhaust blower is communicated with outside kiln tail chimney by pipeline, the exhanst gas outlet of kiln tail dust-precipitator also by pipeline communication to cement kiln end tail exhaust blower entrance.
2. a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus according to claim 1, is characterized in that: establish by soot blower in described low-temperature denitration device.
3. a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus according to claim 2, is characterized in that: described soot blower is acoustic wave ash ejector or compressed air soot-blowing device.
4. a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus according to claim 1, is characterized in that: described injection of reducing agent injection device is for spraying grid or fixed spray gun.
5. a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus according to claim 1, is characterized in that: the reducing agent of described reductant supply system supply is ammoniacal liquor or urea liquid.
6. a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus according to claim 1, it is characterized in that: described catalyst is low temperature catalyst, serviceability temperature scope is 80 ~ 150 DEG C.
7. a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus according to claim 1, is characterized in that: the pipeline that described kiln tail dust-precipitator is connected with injection of reducing agent injection device is provided with butterfly valve.
8. a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus according to claim 1, is characterized in that: the pipeline that described low-temperature denitration device is connected with cement kiln end tail exhaust blower is provided with butterfly valve.
9. a kind of cement kiln end low-temperature smoke air SCR denitrification apparatus according to claim 1, is characterized in that: the pipeline that the exhanst gas outlet of described kiln tail dust-precipitator is connected with cement kiln end tail exhaust blower is provided with butterfly valve.
CN201520180359.1U 2015-03-27 2015-03-27 A kind of cement kiln end low-temperature smoke air SCR denitrification apparatus Expired - Fee Related CN204543995U (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105833726A (en) * 2016-05-03 2016-08-10 艾尼科环保技术(安徽)有限公司 SCR catalyst blockage removing device
CN112604498A (en) * 2020-12-31 2021-04-06 成都达奇环境科技有限公司 Cement kiln flue gas waste heat utilization and purification system and low-temperature SCR denitration system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105833726A (en) * 2016-05-03 2016-08-10 艾尼科环保技术(安徽)有限公司 SCR catalyst blockage removing device
CN112604498A (en) * 2020-12-31 2021-04-06 成都达奇环境科技有限公司 Cement kiln flue gas waste heat utilization and purification system and low-temperature SCR denitration system

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