CN202921161U - Cement kiln flue gas SNCR (selective non-catalytic reduction) denitration system - Google Patents
Cement kiln flue gas SNCR (selective non-catalytic reduction) denitration system Download PDFInfo
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- CN202921161U CN202921161U CN 201220675989 CN201220675989U CN202921161U CN 202921161 U CN202921161 U CN 202921161U CN 201220675989 CN201220675989 CN 201220675989 CN 201220675989 U CN201220675989 U CN 201220675989U CN 202921161 U CN202921161 U CN 202921161U
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Abstract
The utility model belongs to the technical field of flue gas denitration emission reduction control of the nitrogen oxide emission control and management project, and particularly relates to a cement kiln flue gas SNCR (selective non-catalytic reduction) denitration system. The system comprises a denitration DCS and PLC automatic control system, a urea dissolution preparation and storage system, a urea solution diluting and conveying module, a urea solution metering distribution and spray adjusting control device and an outlet flue gas continuous detection device. The system provided by the utility model has the advantages of small transformation workload, short construction and mounting period, small construction investment, low operation cost and high denitration efficiency in cooperation with low-nitrogen optimization combustion technology, is simple, convenient, easy to maintain and manage, and is suitable for the denitration transformation of a cement kiln.
Description
Technical field:
The utility model belongs to the denitrating flue gas reduction of discharging control technology field that engineering was controlled and administered to discharged nitrous oxides, more particularly, relates to cement furnace flue gas SNCR denitrating system.
Background technology:
China has nearly 5,000 of cement production enterprise at present as manufacture of cement the world's strongest nation, and production capacity accounts for more than sixty percent of global total output, and the discharging of cement industry nitrogen oxide accounts for total release and is only second to the thermal power plant; According to " cement industry " 12 " development plan ", eliminate the propelling of work along with the cement industry backward production facilities, the usage ratio of new type dry kiln will significantly increase, when improving energy use efficiency, due to reasons such as ignition temperature height, nitrogen oxide emission will significantly increase.
Country's 12 clear and definite reduction of discharging requirements of cement plant discharged nitrous oxides of plan, existing daily output scale should be according to national regulation and standard-required, the perfect denitration engineering of construction greater than 4000 tons of grog new type dry kiln cement producing lines; The Ministry of Industry and Information Technology's issue " cement industry entry criteria " clearly proposes, and newly-built or reorganization and expansion cement (grog) production line project must configure equipment for denitrifying flue gas.
The utility model content:
The utility model is exactly for the problems referred to above, and a kind of cement furnace flue gas SNCR denitrating system is provided.
SNCR is a kind of denitration mode that need not catalyst, for " SNCR reaction ", is the abbreviation of Selective Non-Catalytic Reduction.Owing to not needing catalyst, for obtaining stronger chemical reactivity, the SNCR technology needs under higher fire box temperature (900-1150 ℃), optionally reduces NOx in flue gas with amino reductives such as ammonia or urea.
For realizing above-mentioned purpose of the present utility model, the utility model adopts following scheme:
Comprise that out of stock DCS and PLC automatic control system, urea dissolving preparation and stocking system, urea liquid dilution and conveyor module, urea solution metering distribute and spraying control set for adjusting and outlet flue gas continuous detection apparatus; Comprise that calculating and control that out of stock DCS and PLC automatic control system are mainly completed have: ammonia/urea demand is calculated, solution prepares and temperature is controlled, dilution is controlled, the spraying urea liquid injection device is regulated control.Calculate the content of NOx according to the flue gas flow that enters burner hearth, oxygen content, temperature, unit load, control the NH3/NOx mol ratio of denitration spraying urea liquid amount of jet.When mol ratio reached setting value, denitration efficiency was maximum, and when mol ratio continued to increase, denitration efficiency can not increase again, and the escapement ratio of ammonia can rise rapidly.
The preparation of described urea liquid and storage system comprise urea storehouse, urea blanking machine, urea dissolving tank, urea liquid delivery pump, urea liquid holding vessel, demineralized water magnetic valve and sweet-water tank by the urea dissolving tank;
Described urea solution metering distributes with the spraying control set for adjusting and comprises air accumulator, switch board and spray gun; Reach in real time and adjust injection concentration, flow and the pressure of controlling spray gun, the flow of difference spraying can be adjusted to balance, in the different load situation, can increase or reduce the reactant flow, need to increase or reduce accordingly pressure and the air quantity of atomizing air; In order to satisfy good atomizing mixed effect, every layer of spray gun adopts independently the control of flow and pressure system, and metering distributes with the spraying adjustment module can effectively regulate the relation of controlling urea liquid flow and atomization air pressure and flow.
In order to prevent that urea crystals from resulting in blockage in injection apparatus, the purging that will carry out spray gun with air before spray gun is out of service, program is carried out the air purge in 90 seconds automatically to injection apparatus out of service.
described urea liquid dilution and conveyor module comprise urea solution metering force (forcing) pump, dilution water metering force (forcing) pump and mixing arrangement, by the NOx concentration value that exports flue gas continuous detection apparatus feedback or the flue gas flow that enters burner hearth, oxygen content, temperature, unit loads etc. calculate the set-point that needs reducing agent, the DCS system calculates the dilute urea liquid inventory of required injection according to this set-point, and determine to dilute the when set-point of urea liquid flow set-point and dilution water according to the urea liquid initial concentration, again according to the detected value of urea liquid flow and the deviation from the index value input Pl controller of calculating, regulate this pipeline urea solution metering force (forcing) pump after control action, make the value of feedback of actual measurement near set-point, thereby satisfy the control accuracy requirement.Simultaneously according to the dilution water flow set-point that calculates gained and the input of the deviation between actual dilution water flow detection values Pl controller, regulate dilution water metering force (forcing) pump after control action, make the dilution water flow satisfy the required flow set-point of thinner ratio, the deviation of its set-point and value of feedback satisfies the control accuracy requirement.
The information that outlet flue gas continuous detection apparatus detects has flue gas flow, NOx concentration, flue gas oxygen content, flue dust, humidity, SO2 concentration, NH3 concentration.
The urea storehouse is connected with urea dissolving tank, urea liquid delivery pump, urea liquid holding vessel, urea solution metering force (forcing) pump, mixing arrangement, switch board, spray gun successively via the urea blanking machine;
Demineralized water is divided into two after entering the preparation of urea liquid and storage system, and one is connected with the urea dissolving tank by the demineralized water magnetic valve; Another successively with the demineralized water water tank, release water metering force (forcing) pump, mixing arrangement is connected.
Be provided with temperature transmitter, motor-driven valve, flowmeter and Pressure gauge in the preparation of described urea liquid and storage system.
Be provided with mixer and steam pipe coil in the urea dissolving tank.
Be provided with solution switch valve, solution pressure meter, solution control valve, spray gun blow down valve, atomizing air switch valve, atomization air pressure meter, atomizing air control valve, pressure transmitter, spray gun cooling-air switch valve in described urea solution metering distribution and spraying control set for adjusting.
The beneficial effects of the utility model:
The utility model retrofit work amount is little, simple and convenient, the construction and installation cycle is short, and construction investment is little, operating cost is low, easy care is managed, collaborative low nitrogen Optimizing Combustion technology denitration efficiency is higher, is suitable for the denitration transformation of cement kiln.
The reducing agent of the utility model denitrating technique is ammonia, generally evaporates by liquefied ammonia or is indirectly prepared by ammoniacal liquor, urea.According to the difference of raw material, denitrification reducing agent preparation technology mainly contains: liquid ammonia process for caustic soda purification, Ammonia Process, urea water solution, urea pyrolysis method.Should fully compare the factor of the aspects such as security, economy, system maintenance easy and environmental requirement in denitrification reducing agent preparation technology's selection.Adopt liquid ammonia process for caustic soda purification and Ammonia Process to prepare reducing agent and have the characteristics such as technique is simple, energy consumption is low, easy to maintenance.But liquefied ammonia and ammoniacal liquor are all noxious materials, and its transportation and storage all belong to major hazard source, have larger security risk.When adopting liquid ammonia process for caustic soda purification to prepare denitrification reducing agent, should first obtain the transportation route license of liquid nitrogen (ammoniacal liquor), safety evaluation that liquid nitrogen (ammoniacal liquor) stores, and the supportive file such as environmental impact assessment authentication in previous work.Also should use registration unit to register to hazardous chemical in later stage work, obtain hazardous chemical and use registration card.
Urea is the ideal source of ammonia, and with anhydrous ammonia and there is water ammonia to compare, urea is nontoxic, harmless chemicals, and without explosion potential, urea need not to consider safety and dangerous factor in transportation, in storing, more must not appoint the emergency procedure what is formulated to guarantee safety.
The utility model adopts the preparation system of urea liquid to use urea to replace liquefied ammonia and applies to can obtain better security context in denitrification apparatus, because urea is to transform ammonification after the spirt hybrid combustor, realize redox reaction, therefore, can avoid ammonia to reveal and the human injury that causes at power plant's storage and pipeline, valve.
Description of drawings:
Fig. 1 is structural representation of the present utility model.
in Fig. 1, 1 is outlet flue gas continuous detection apparatus, 2 is spray gun, 3 is the urea solution metering force (forcing) pump, 4 are urea solution metering distribution and spraying control set for adjusting, 5 is air accumulator, 6 is the urea storehouse, 7 are urea dissolving preparation and stocking system, 8 is the urea blanking machine, 9 is the demineralized water magnetic valve, 10 is the urea dissolving tank, 11 is steam pipe coil, 12 is the urea liquid delivery pump, 13 is the urea liquid holding vessel, 14 is sweet-water tank, 15 are dilution water metering force (forcing) pump, 16 are urea liquid dilution and conveyor module, 17 is mixing arrangement, 18 is out of stock DCS and PLC automatic control system.
The specific embodiment:
Comprise that out of stock DCS and PLC automatic control system, urea dissolving preparation and stocking system, urea liquid dilution and conveyor module, urea solution metering distribute and spraying control set for adjusting and outlet flue gas continuous detection apparatus;
The preparation of described urea liquid and storage system comprise urea storehouse, urea blanking machine, urea dissolving tank, urea liquid delivery pump, urea liquid holding vessel, demineralized water magnetic valve and sweet-water tank by the urea dissolving tank;
Described urea solution metering distributes with the spraying control set for adjusting and comprises air accumulator, switch board and spray gun;
Described urea liquid dilution and conveyor module comprise urea solution metering force (forcing) pump, dilution water metering force (forcing) pump and mixing arrangement;
The urea storehouse is connected with urea dissolving tank, urea liquid delivery pump, urea liquid holding vessel, urea solution metering force (forcing) pump, mixing arrangement, switch board, spray gun successively via the urea blanking machine;
Demineralized water is divided into two after entering the preparation of urea liquid and storage system, and one is connected with the urea dissolving tank by the demineralized water magnetic valve; Another successively with the demineralized water water tank, release water metering force (forcing) pump, mixing arrangement is connected.
Be provided with temperature transmitter, motor-driven valve, flowmeter and Pressure gauge in the preparation of described urea liquid and storage system.
Be provided with mixer and steam pipe coil in the urea dissolving tank.
Be provided with solution switch valve, solution pressure meter, solution control valve, spray gun blow down valve, atomizing air switch valve, atomization air pressure meter, atomizing air control valve, pressure transmitter, spray gun cooling-air switch valve in described urea solution metering distribution and spraying control set for adjusting.
Embodiment 1
be applied to remove cement furnace flue gas SNCR denitrating system in the reconstruction project of new type nonaqueous cement production line nitrogen oxide (NOx), adopt urea to spray in stove as reducing agent and carry out selective reaction with NOx, without catalyst, it is the zone of 850 ℃～1100 ℃ that reducing agent sprays into calciner temperature, denitrating system is injected in dore furnace with the urea liquid consumption of 320～420kg/h, enter flue through four at equally spaced four spray guns of same plane, under hot environment, urea liquid resolves into amino, produce chemical reaction with NOx, generate the nitrogen G﹠W, reach the effect of denitration.After transformation is completed the outlet nitrous oxides concentration less than 100mg/Nm3 (10% oxygen content, NO meter), denitration efficiency greater than 60%; Operating cost is low, has brought into play the advantage without operating cost increase denitration efficiency of fractional combustion, also brings into play the target call of SNCR efficient denitrification simultaneously, the escaping of ammonia≤10ppm.
Claims (4)
1. cement furnace flue gas SNCR denitrating system, it is characterized in that, comprise that out of stock DCS and PLC automatic control system, urea dissolving preparation and stocking system, urea liquid dilution and conveyor module, urea solution metering distribute and spraying control set for adjusting and outlet flue gas continuous detection apparatus;
The preparation of described urea liquid and storage system comprise urea storehouse, urea blanking machine, urea dissolving tank, urea liquid delivery pump, urea liquid holding vessel, demineralized water magnetic valve and sweet-water tank by the urea dissolving tank;
Described urea solution metering distributes with the spraying control set for adjusting and comprises air accumulator, switch board and spray gun;
Described urea liquid dilution and conveyor module comprise urea solution metering force (forcing) pump, dilution water metering force (forcing) pump and mixing arrangement;
The urea storehouse is connected with urea dissolving tank, urea liquid delivery pump, urea liquid holding vessel, urea solution metering force (forcing) pump, mixing arrangement, switch board, spray gun successively via the urea blanking machine;
Demineralized water is divided into two after entering the preparation of urea liquid and storage system, and one is connected with the urea dissolving tank by the demineralized water magnetic valve; Another successively with the demineralized water water tank, release water metering force (forcing) pump, mixing arrangement is connected.
2. cement furnace flue gas SNCR denitrating system according to claim 1, is characterized in that, is provided with temperature transmitter, motor-driven valve, flowmeter and Pressure gauge in the preparation of described urea liquid and storage system.
3. cement furnace flue gas SNCR denitrating system according to claim 1, is characterized in that, is provided with mixer and steam pipe coil in the urea dissolving tank.
4. cement furnace flue gas SNCR denitrating system according to claim 1, it is characterized in that, be provided with solution switch valve, solution pressure meter, solution control valve, spray gun blow down valve, atomizing air switch valve, atomization air pressure meter, atomizing air control valve, pressure transmitter, spray gun cooling-air switch valve in described urea solution metering distribution and spraying control set for adjusting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220675989 CN202921161U (en) | 2012-11-30 | 2012-11-30 | Cement kiln flue gas SNCR (selective non-catalytic reduction) denitration system |
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| CN 201220675989 CN202921161U (en) | 2012-11-30 | 2012-11-30 | Cement kiln flue gas SNCR (selective non-catalytic reduction) denitration system |
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| CN 201220675989 Expired - Fee Related CN202921161U (en) | 2012-11-30 | 2012-11-30 | Cement kiln flue gas SNCR (selective non-catalytic reduction) denitration system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103301737A (en) * | 2013-06-07 | 2013-09-18 | 大连贝斯特环境工程设备有限公司 | Urea hydrolyzed SNCR (selective non-catalytic reduction) flue gas denitrification device for fluidized bed boiler |
| CN103301747A (en) * | 2013-06-07 | 2013-09-18 | 大连贝斯特环境工程设备有限公司 | SCR (Selective Catalytic Reduction) flue gas denitration device for urea pyrolysis |
| CN104020792A (en) * | 2014-05-23 | 2014-09-03 | 国家电网公司 | Automatic control system for flue gas denitration of electric power plant |
| CN104437064A (en) * | 2014-10-31 | 2015-03-25 | 东莞理文造纸厂有限公司 | Denitration system |
| CN106268269A (en) * | 2016-09-23 | 2017-01-04 | 光大环保技术研究院（深圳）有限公司 | The device of a kind of nitrogen oxides in controlling to burn and control method |
| CN106764447A (en) * | 2016-12-26 | 2017-05-31 | 北京国电龙源环保工程有限公司 | A kind of urea liquid anti-clogging protection system |
| CN107051157A (en) * | 2017-04-24 | 2017-08-18 | 中国联合工程公司 | A kind of SNCR denitration reducing agent prepares Storing and conveying system and method |
| CN107930395A (en) * | 2017-11-10 | 2018-04-20 | 中国天辰工程有限公司 | A kind of production technology and system that urea for vehicle solution is prepared by industrial urea |
| CN108310973A (en) * | 2018-03-29 | 2018-07-24 | 中国神华能源股份有限公司 | Automatic ammonia-gas spraying device and coal fired power plant flue gas system |
| CN110180368A (en) * | 2019-06-11 | 2019-08-30 | 内蒙古弘睿节能科技有限公司 | A kind of full-automatic urea denitrification apparatus |
-
2012
- 2012-11-30 CN CN 201220675989 patent/CN202921161U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103301737A (en) * | 2013-06-07 | 2013-09-18 | 大连贝斯特环境工程设备有限公司 | Urea hydrolyzed SNCR (selective non-catalytic reduction) flue gas denitrification device for fluidized bed boiler |
| CN103301747A (en) * | 2013-06-07 | 2013-09-18 | 大连贝斯特环境工程设备有限公司 | SCR (Selective Catalytic Reduction) flue gas denitration device for urea pyrolysis |
| CN104020792A (en) * | 2014-05-23 | 2014-09-03 | 国家电网公司 | Automatic control system for flue gas denitration of electric power plant |
| CN104437064A (en) * | 2014-10-31 | 2015-03-25 | 东莞理文造纸厂有限公司 | Denitration system |
| CN104437064B (en) * | 2014-10-31 | 2017-01-11 | 东莞理文造纸厂有限公司 | Denitration system |
| CN106268269A (en) * | 2016-09-23 | 2017-01-04 | 光大环保技术研究院（深圳）有限公司 | The device of a kind of nitrogen oxides in controlling to burn and control method |
| CN106764447A (en) * | 2016-12-26 | 2017-05-31 | 北京国电龙源环保工程有限公司 | A kind of urea liquid anti-clogging protection system |
| CN107051157A (en) * | 2017-04-24 | 2017-08-18 | 中国联合工程公司 | A kind of SNCR denitration reducing agent prepares Storing and conveying system and method |
| CN107051157B (en) * | 2017-04-24 | 2022-11-11 | 中国联合工程有限公司 | SNCR denitration reducing agent preparation, storage and conveying system and method |
| CN107930395A (en) * | 2017-11-10 | 2018-04-20 | 中国天辰工程有限公司 | A kind of production technology and system that urea for vehicle solution is prepared by industrial urea |
| CN108310973A (en) * | 2018-03-29 | 2018-07-24 | 中国神华能源股份有限公司 | Automatic ammonia-gas spraying device and coal fired power plant flue gas system |
| CN110180368A (en) * | 2019-06-11 | 2019-08-30 | 内蒙古弘睿节能科技有限公司 | A kind of full-automatic urea denitrification apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130508 Termination date: 20151130 |
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| EXPY | Termination of patent right or utility model |