CN109847552A - A kind of cement kiln flue gas denitrating system and its control method - Google Patents
A kind of cement kiln flue gas denitrating system and its control method Download PDFInfo
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- CN109847552A CN109847552A CN201910040334.4A CN201910040334A CN109847552A CN 109847552 A CN109847552 A CN 109847552A CN 201910040334 A CN201910040334 A CN 201910040334A CN 109847552 A CN109847552 A CN 109847552A
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- stage whirlwind
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- flue gas
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Abstract
The invention discloses a kind of cement kiln flue gas denitrating system and its control methods, comprising: kiln body；Dore furnace is connect with kiln body；Five-stage whirlwind cartridge system, connect with kiln body and dore furnace, and five-stage whirlwind cartridge system includes one cyclonic cylinder, second level cyclone cylinder, three-level cyclone cylinder, Category Four cyclone cylinder, five-stage whirlwind cylinder；Spray ammonia rifle, it is arranged in the middle part of dore furnace, five-stage whirlwind cylinder entrance, five-stage whirlwind cylinder cone portion and vertical tube part, five-stage whirlwind cylinder exit, further decreases cement factory NOx emission concentration, reduce denitration ammonia volume, reduce corrosion of the system the escaping of ammonia to equipment and the secondary pollution to atmosphere.
Description
Technical field
The invention belongs to cement clinker production line technical field more particularly to a kind of cement kiln flue gas denitrating system and its
Control method.
Background technique
At present there are mainly two types of cement factory denitrating flue gas end-of-pipe control technologies, first, traditional SNCR denitration technology (selection
Property non-catalytic reduction technology)；Second, SCR denitration technology (SCR technology).
In the implementation of the present invention, the inventor finds that the existing technology has at least the following problems:
Traditional SNCR denitration technology --- use ammonium hydroxide for reducing agent, no catalyst is needed in 850 DEG C or so lower and NOX
Denitration is realized in reaction.But its reaction efficiency is lower, and denitration efficiency is only 60% or so, and reducing agent ammonium hydroxide consumption is big, discharge
Ammonia slip concentration is higher in tail gas, and there are secondary pollutions.
SCR denitration technology --- under dedicated catalyst action, using ammonium hydroxide as reducing agent, realize denitrating flue gas, it is anti-
Answer temperature generally at 300-400 DEG C or so.Because of the effect of catalyst, reaction efficiency is improved, denitration efficiency is up to 90%, at present
It is widely applied in industries such as electric power.But cement industry due to catalyst by clinker line dust, SO2 discharge etc. influence, be easy poisoning,
Lead to catalyst failure, generates solid waste, there are still many technical problems for the application of SCR technology.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind to further decrease cement factory NOx emission concentration, reduces
Denitration ammonia volume, the cement kiln flue gas denitration system for reducing corrosion of the system the escaping of ammonia to equipment and the secondary pollution to atmosphere
System and its control method.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is that: a kind of cement kiln flue gas denitration system
System, comprising:
Kiln body；
Dore furnace is connect with the kiln body；
Five-stage whirlwind cartridge system is connect with the kiln body and dore furnace, and the five-stage whirlwind cartridge system includes one cyclonic
Cylinder, second level cyclone cylinder, three-level cyclone cylinder, Category Four cyclone cylinder, five-stage whirlwind cylinder；
Ammonia rifle is sprayed, is arranged in the middle part of dore furnace, five-stage whirlwind cylinder entrance, five-stage whirlwind cylinder cone portion and vertical tube part, Pyatyi
Cyclone cylinder exit.
The spray ammonia rifle be movably arranged on the dore furnace middle part, five-stage whirlwind cylinder entrance, five-stage whirlwind cylinder cone portion and
Vertical tube part, five-stage whirlwind cylinder exit；The insertion angle and depth of the spray ammonia rifle can be adjusted.
The five-stage whirlwind cylinder includes the vertical tube part on top and the cone portion of lower part.
A kind of control method of above-mentioned cement kiln flue gas denitrating system, according to clinker line kiln tail difference exhaust gas point
Amount of nitrogen oxides is different in flue gas, by set target value, controls each point ammonia spraying amount by shunting valve group, and spray according to each point
Ammonia amount is different, Ammonia water distributing gun insertion depth is different, and matching compressed air pressure is respectively set.
A technical solution in above-mentioned technical proposal has the following advantages that or beneficial effect, further decreases cement factory
NOx emission concentration reduces denitration ammonia volume, reduces corrosion of the system the escaping of ammonia to equipment and the secondary pollution to atmosphere.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the cement kiln flue gas denitrating system provided in the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the five-stage whirlwind cylinder of the cement kiln flue gas denitrating system of Fig. 1；
Label in above-mentioned figure is equal are as follows: 1, kiln body, 2, dore furnace, 3, five-stage whirlwind cylinder, 4, Category Four cyclone cylinder, 5, spray ammonia
Rifle.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Referring to Fig. 1-2, a kind of cement kiln flue gas denitrating system, comprising:
Kiln body；
Dore furnace is connect with kiln body；
Five-stage whirlwind cartridge system, connect with kiln body and dore furnace, and five-stage whirlwind cartridge system includes one cyclonic cylinder, second level rotation
Air duct, three-level cyclone cylinder, Category Four cyclone cylinder, five-stage whirlwind cylinder；
Ammonia rifle is sprayed, is arranged in the middle part of dore furnace, five-stage whirlwind cylinder entrance, five-stage whirlwind cylinder cone portion and vertical tube part, Pyatyi
Cyclone cylinder exit.It selects to be suitable for reaction temperature field by reconnaissance, adjusts spray gun insertion angle and depth, reinforce atomization mixing effect
Fruit extends contact time, and improves reaction efficiency.
Spray ammonia rifle is movably arranged on dore furnace middle part, five-stage whirlwind cylinder entrance, five-stage whirlwind cylinder cone portion and vertical tube part, five
Grade cyclone cylinder exit；The insertion angle and depth for spraying ammonia rifle can be adjusted.
Five-stage whirlwind cylinder includes the vertical tube part on top and the cone portion of lower part.
Two aspects of ammonia point are sprayed by accurate stability contorting each point ammonia spraying amount and reasonable Arrangement system, are realized efficiently precisely de-
The conversion of nitrogen oxides generated in clinker production process is the nitrogen and water of cleanliness without any pollution, whole process by nitre function
Middle no waste water and waste liquid discharge, and guarantee that amount of ammonia slip is lower than safety and environmental protection limits value, by rationally controlling realization cement factory
Flue gas nitrogen oxide minimum discharge requirement reduces pollution of the nitrogen oxides to environment, helps further to promote cement industry
Level of clean production.
A kind of control method of above-mentioned cement kiln flue gas denitrating system, according to clinker line kiln tail difference exhaust gas point
Amount of nitrogen oxides is different in flue gas, by set target value, is precisely controlled and shunts the stable best ammonia spraying amount of each point of valve group, and root
Different according to each point ammonia spraying amount, Ammonia water distributing gun insertion depth is different, and matching optimal compression air pressure is respectively set, and guarantees that flow is accurate
Each point best atomizing effect is realized while shunting, improves ammonium hydroxide reaction efficiency, reduces ammonium hydroxide discharge rate and reduces system the escaping of ammonia
Amount.
At certain, 5000t/d cement clinker production line is practical comes into operation, as standard state NOXControl 100mg/m3When following, ton is ripe
Ammonia volume is expected at 3.2L/t or so (ammonia volume 800L/h or so), amount of ammonia slip is 0.1mg/m3 and system run all right,
2L/t or so is saved compared to traditional SNCR system ammonia volume, generating economic benefit is 1.4 yuan/t.cl of ton clinker cost savings left
It is right.
After above-mentioned scheme, cement factory NOx emission concentration is further decreased, denitration ammonia volume is reduced, reduces
Corrosion of the system the escaping of ammonia to equipment and the secondary pollution to atmosphere.
The present invention is exemplarily described above in conjunction with attached drawing, it is clear that the present invention implements not by aforesaid way
Limitation, as long as the improvement for the various unsubstantialities that the inventive concept and technical scheme of the present invention carry out is used, or without changing
It is within the scope of the present invention into the conception and technical scheme of the invention are directly applied to other occasions.
Claims (4)
1. a kind of cement kiln flue gas denitrating system comprising:
Kiln body；
Dore furnace is connect with the kiln body；
Five-stage whirlwind cartridge system is connect with the kiln body and dore furnace, and the five-stage whirlwind cartridge system includes one cyclonic cylinder, two
Grade cyclone cylinder, three-level cyclone cylinder, Category Four cyclone cylinder, five-stage whirlwind cylinder；
Ammonia rifle is sprayed, is arranged in the middle part of dore furnace, five-stage whirlwind cylinder entrance, five-stage whirlwind cylinder cone portion and vertical tube part, five-stage whirlwind
Cylinder exit.
2. cement kiln flue gas denitrating system as described in claim 1, which is characterized in that the spray ammonia rifle is movably arranged on institute
State dore furnace middle part, five-stage whirlwind cylinder entrance, five-stage whirlwind cylinder cone portion and vertical tube part, five-stage whirlwind cylinder exit；The spray
The insertion angle and depth of ammonia rifle can be adjusted.
3. cement kiln flue gas denitrating system as claimed in claim 2, which is characterized in that the five-stage whirlwind cylinder includes top
Vertical tube part and lower part cone portion.
4. a kind of control method of cement kiln flue gas denitrating system as claimed in claim 3, which is characterized in that according to cement
Amount of nitrogen oxides is different in clinker line kiln tail difference exhaust gas point flue gas, each by shunting valve group control by set target value
Point ammonia spraying amount, and, Ammonia water distributing gun insertion depth difference different according to each point ammonia spraying amount, are respectively set matching compressed air pressure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910040334.4A CN109847552A (en) | 2019-01-16 | 2019-01-16 | A kind of cement kiln flue gas denitrating system and its control method |
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| CN201910040334.4A CN109847552A (en) | 2019-01-16 | 2019-01-16 | A kind of cement kiln flue gas denitrating system and its control method |
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| CN109847552A true CN109847552A (en) | 2019-06-07 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109821392A (en) * | 2019-03-05 | 2019-05-31 | 南京西普环保科技有限公司 | A kind of denitrating system and its control method of dry method cement rotary kiln |
| CN110479061A (en) * | 2019-08-22 | 2019-11-22 | 深圳东方锅炉控制有限公司 | SNCR control system and method based on fire box temperature field information |
| CN110523259A (en) * | 2019-09-11 | 2019-12-03 | 天津水泥工业设计研究院有限公司 | A kind of gametic fertility device, technique and system based on cyclone cylinder dilute-phase zone |
| CN112316684A (en) * | 2020-10-29 | 2021-02-05 | 何金峥 | Dry-method cement flue gas denitration system |
| CN112973415A (en) * | 2021-02-19 | 2021-06-18 | 清华大学 | Cement kiln device and SNCR denitration method |
| CN113304599A (en) * | 2021-05-13 | 2021-08-27 | 天津中材工程研究中心有限公司 | Spray gun arrangement method for preventing cyclone tube from skinning |
| CN114849438A (en) * | 2022-03-16 | 2022-08-05 | 冀东水泥璧山有限责任公司 | Clinker workshop deNOx systems |
| CN115624847A (en) * | 2022-12-16 | 2023-01-20 | 河北省建筑材料工业设计研究院有限公司 | Accurate denitration control system of cement kiln self-adaptation |
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| CN107398163A (en) * | 2017-09-21 | 2017-11-28 | 长沙理工大学 | A kind of scalable and shuttle-type SNCR reducing agent injection apparatus |
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| CN209848644U (en) * | 2019-01-16 | 2019-12-27 | 安徽海螺水泥股份有限公司 | Denitration system for cement kiln flue gas |
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| JP2011106754A (en) * | 2009-11-18 | 2011-06-02 | Sumitomo Heavy Ind Ltd | Circulating fluidized bed furnace and method for controlling the same |
| CN102553419A (en) * | 2012-03-20 | 2012-07-11 | 南京龙源环保有限公司 | Reducing agent injection device for selective non-catalytic reduction system |
| CN102921284A (en) * | 2012-10-11 | 2013-02-13 | 浙江省环境保护科学设计研究院 | Method and device for controlling NOx concentration in smoke gas of cement kiln |
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Cited By (11)
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| CN109821392A (en) * | 2019-03-05 | 2019-05-31 | 南京西普环保科技有限公司 | A kind of denitrating system and its control method of dry method cement rotary kiln |
| CN110479061A (en) * | 2019-08-22 | 2019-11-22 | 深圳东方锅炉控制有限公司 | SNCR control system and method based on fire box temperature field information |
| CN110479061B (en) * | 2019-08-22 | 2022-07-22 | 深圳东方锅炉控制有限公司 | SNCR control system and method based on furnace temperature field information |
| CN110523259A (en) * | 2019-09-11 | 2019-12-03 | 天津水泥工业设计研究院有限公司 | A kind of gametic fertility device, technique and system based on cyclone cylinder dilute-phase zone |
| CN112316684A (en) * | 2020-10-29 | 2021-02-05 | 何金峥 | Dry-method cement flue gas denitration system |
| CN112973415A (en) * | 2021-02-19 | 2021-06-18 | 清华大学 | Cement kiln device and SNCR denitration method |
| CN113304599A (en) * | 2021-05-13 | 2021-08-27 | 天津中材工程研究中心有限公司 | Spray gun arrangement method for preventing cyclone tube from skinning |
| CN113304599B (en) * | 2021-05-13 | 2022-05-27 | 天津中材工程研究中心有限公司 | Spray gun arrangement method for preventing cyclone tube from skinning |
| CN114849438A (en) * | 2022-03-16 | 2022-08-05 | 冀东水泥璧山有限责任公司 | Clinker workshop deNOx systems |
| CN114849438B (en) * | 2022-03-16 | 2024-04-02 | 冀东水泥璧山有限责任公司 | Clinker workshop denitration system |
| CN115624847A (en) * | 2022-12-16 | 2023-01-20 | 河北省建筑材料工业设计研究院有限公司 | Accurate denitration control system of cement kiln self-adaptation |
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