CN202569946U - Ammonia injection automatic control device for flue gas denitration by selective non-catalytic reduction (SNCR) method - Google Patents
Ammonia injection automatic control device for flue gas denitration by selective non-catalytic reduction (SNCR) method Download PDFInfo
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- CN202569946U CN202569946U CN 201220185789 CN201220185789U CN202569946U CN 202569946 U CN202569946 U CN 202569946U CN 201220185789 CN201220185789 CN 201220185789 CN 201220185789 U CN201220185789 U CN 201220185789U CN 202569946 U CN202569946 U CN 202569946U
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Abstract
The utility model discloses an ammonia injection automatic control device for flue gas denitration by a selective non-catalytic reduction (SNCR) method, which comprises an ammonia water tank and an ammonia water pump, wherein an inlet of the ammonia water pump is connected with the ammonia water tank, and an outlet of the ammonia water pump is connected with an atomized spray gun by a main pipeline; the main pipeline is also provided with an ammonia water regulating valve which is connected with an automatic controller; the ammonia injection automatic control device also comprises a measurement instrument used for detecting the flue gas temperature, the flow rate, the nitric oxide and the ammonia concentration of kiln tail; and the measurement instrument is connected with the automatic controller. After adopting the structure, the ammonia injection automatic control device can be used for detecting the flue gas temperature, the flow rate, the nitric oxide and the ammonia concentration by the measurement instrument, and transmitting the data into the automatic controller; and the automatic controller can control the regulating valve arranged on the main pipeline according to the data, so that different working conditions can be automatically adapted, the running cost of a denitration device is lowered, and the denitration efficiency, the ammonia escape and the operation difficulty are taken into account at the same time.
Description
Technical field
The utility model relates to a kind of ammonia that is used for new type nonaqueous cement kiln SNCR method denitrating flue gas and sprays self-con-tained unit.
Background technology
Be further to strengthen the prevention and cure of pollution of nitrogen oxide, national environmental protection " 12 " planning explicitly calls for: the new type nonaqueous cement kiln will carry out the low nitrogen burning technological transformation, and newly-built cement producing line wants installation effectiveness to be not less than 60% denitration facility.Sichuan Province government will also explicitly call in formal " suggestion of nitrogen denitration work falls in " 12 " " of putting into effect the end of the year 2011: 2000 tons of existing daily outputs and above grog new type nonaqueous cement production line add builds non-selective catalytic reduction (SNCR) denitrating flue gas facility, and comprehensive denitration efficiency reaches more than 40%; Newly-built, reorganization and expansion new type nonaqueous cement project should adopt advanced low nitrogen burning technology, builds up supporting SNCR denitrating flue gas facility synchronously, and comprehensive denitration efficiency reaches more than 70%.
The technology that reduces amount of nitrogen oxides in the cement kiln flue gas mainly contains: low nitrogen burning technology, SCR (selective catalytic reduction) technology and SNCR (SNCR method) technology.Because the cement kiln exit gas has characteristics such as complicated component and dust content height, be prone to cause that denitrating catalyst is poisoned and obstruction, therefore be not suitable for adopting the SCR technology.Pure low nitrogen burning technology denitration efficiency is very low, can not satisfy the environment protection emission requirement again, therefore also need combine the higher SNCR denitration technology of denitration efficiency that cement kiln flue gas is administered.
SNCR is the SNCR method, is without catalyst, 800 ℃-1100 ℃ scope inner direct reducing agents (ammonia or urea) in burner hearth, optionally with flue gas in reaction of nitrogen oxides, make it be reduced to N
2And H
2The denitration technology of O; It is little to have floor space, and investment, operating cost is less, the characteristics that install, operation are prone to; Relatively be fit to the denitration engineering of group, Industrial Boiler, fluidized-bed combustion boiler, cement furnace and waste incineration power plant in the old power plant, denitration efficiency is 40 ~ 70%.In addition, have characteristics such as size of burner hearth is less relatively, the kiln exit gas temperature is lower to new type nonaqueous cement kiln (comparing with boiler of power plant), take into account factors such as considering denitration efficiency and ammonia utilization rate, best denitrification reducing agent is an ammoniacal liquor.
At present, the denitrating flue gas work of domestic cement plant is in the starting stage, all cement plant equipment for denitrifying flue gas or plan to build or building.The technology of domestic SNCR builder is all by external introduction, core technology not on top of as yet, the case of successful Application does not almost have yet.The ammonia emitted dose of SNCR denitrification apparatus in running nearly all is by manual adjustment; Add ammonia concn and have fluctuation; Nitrous oxides concentration in the kiln exit gas also changing, therefore, causes ammonia spraying amount unreasonable most probably; Ammonia content exceeds standard in the flue gas behind the nitrogen rejection facility, can not take into account denitration efficiency and the escaping of ammonia and cause secondary pollution and denitration operating cost.
The utility model content
To the technical problem of above-mentioned existence, the utility model provides a kind of ammonia of the SNCR of being used for method denitrating flue gas to spray self-con-tained unit, can adjust ammonia spraying amount voluntarily according to working condition.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts is:
A kind of ammonia that is used for SNCR method denitrating flue gas sprays self-con-tained unit, comprises ammonia water tank, aqua ammonia pump; Said aqua ammonia pump inlet links to each other with ammonia water tank, and the aqua ammonia pump outlet utilizes total pipeline to link to each other with atomizing lance; It is characterized in that: also be provided with the ammoniacal liquor control valve on the said total pipeline, said ammoniacal liquor control valve links to each other with automatic controller; Also comprise the measuring instrument that is used to detect kiln exit gas temperature, flow, nitrogen oxide and ammonia concentration, said measuring instrument is connected with automatic controller.
As a kind of improvement, be provided with the dilution water pipe between said ammonia water tank and the aqua ammonia pump; Said dilution water pipe is provided with the dilution water control valve; Said dilution water control valve is connected with automatic controller; Total pipeline is provided with mass flowmenter, and said mass flowmenter is connected with automatic controller.
As a kind of preferred, said total pipeline is provided with pressure transmitter; Said pressure transmitter is connected with automatic controller; Said aqua ammonia pump is connected with automatic controller.
Improve as another kind, described total pipeline derives some laterals; Said lateral is provided with branch's control valve; Branch's control valve is connected with automatic controller; Said lateral derives some secondary laterals, and said secondary lateral is connected with atomizing lance; The secondary lateral is provided with tiny flow quantity meter and the pressure transmitter that links to each other with automatic controller.
As a kind of preferred, described ammoniacal liquor control valve, dilution water control valve and branch's control valve are the proportional integral control valve.
The usefulness of the utility model is:
Ammonia with said structure sprays self-con-tained unit, utilizes measuring instrument to detect flue-gas temperature, flow, nitrogen oxide and ammonia concentration, and transfer of data is arrived automatic controller; Automatic controller utilizes the control valve on the above-mentioned Data Control total pipeline, adapts to different working conditions automatically, reduces denitrification apparatus operating cost, takes into account denitration efficiency and the escaping of ammonia and operation easier simultaneously.Ammoniacal liquor control valve and mass flowmenter can be in time change according to amount of nitrogen oxides in the kiln exit gas and ammonia content, and regulate required ammonia spraying amount automatically, keeping the design denitration efficiency, and in the control tail gas ammonia content in prescribed limit.
Because there is fluctuation in ammonia concn in the ammonia jar; For accurately controlling ammonia spraying amount; Set up one road dilution water in the aqua ammonia pump import; And the mass flowmenter on proportional integral control valve on the dilution water pipeline and the aqua ammonia pump outlet header road controlled through automatic controller, be certain value to keep the ammonia concn that sprays into dore furnace, avoided causing the not enough or excessive phenomenon of spray ammonia because of ammonia concn changes.
Pressure transmitter on the total pipeline links to each other with the automatic control controller, in order to the control aqua ammonia pump, carries out VFC, and fluid pressure is a certain value in the pipeline to keep.
The setting of lateral and secondary lateral can connect a plurality of atomizing lances; On the every secondary lateral tiny flow quantity meter and the pressure transmitter that links to each other with automatic controller is set all, can detects pressure and flow in the every secondary lateral, and feed back to automatic controller, control respectively.
The branch's control valve that is provided with on the lateral can be controlled lateral according to condition of different.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Mark among the figure: 1 ammonia water tank, 2 aqua ammonia pumps, 3 ammoniacal liquor control valves, 4 dilution water control valves, 5 dilution water pipes, 6 total pipelines, 7 mass flowmenters, 8 pressure transmitters, 9 laterals, 10 branch's control valves, 11 secondary laterals, 12 tiny flow quantity meters, 13 pressure transmitters, 14 atomizing lances, 15 automatic controllers, 16 measuring instruments.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is done detailed explanation.
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
As shown in Figure 1:
The utility model comprises ammonia water tank 1, aqua ammonia pump 2; Said aqua ammonia pump 2 inlets link to each other with ammonia water tank 1, and aqua ammonia pump 2 outlets utilize total pipeline 6 to link to each other with atomizing lance 14; It is characterized in that: also be provided with ammoniacal liquor control valve 3 on the said total pipeline 6, said ammoniacal liquor control valve 3 links to each other with automatic controller 15; Also comprise the measuring instrument 16 that is used to detect kiln exit gas temperature, flow, nitrogen oxide and ammonia concentration, said measuring instrument 16 is connected 15 with automatic controller.Be provided with dilution water pipe 5 between ammonia water tank 1 and the aqua ammonia pump 2; Said dilution water pipe 5 is provided with dilution water control valve 4; Said dilution water control valve 4 is connected with automatic controller 15; Total pipeline 6 is provided with mass flowmenter 7, and said mass flowmenter 7 is connected 15 with automatic controller.Total pipeline 6 is provided with pressure transmitter 8; Said pressure transmitter 8 is connected 15 with automatic controller; Said aqua ammonia pump 2 is connected with automatic controller 15.Total pipeline 6 can derive some laterals 9; Said lateral 9 is provided with branch's control valve 10; Branch's control valve 10 is connected with automatic controller 15; Said lateral 9 derives some secondary laterals 11, and said secondary lateral 11 is connected with atomizing lance 14; Secondary lateral 11 is provided with the tiny flow quantity meter 12 and pressure transmitter 13 that links to each other with automatic controller 15.
Ammoniacal liquor control valve 3, dilution water control valve 4 and branch's control valve 10 are preferably the proportional integral control valve.
In the time of work, measuring instrument 16 detected Gas Parameters (mainly comprising flue gas flow, nitrous oxides concentration, ammonia concentration and temperature etc.) feed back to automatic controller 15, regulate ammonia spraying amount voluntarily through ammoniacal liquor control valve on the total pipeline 63 and mass flowmenter 7.Ammoniacal liquor variable density according to mass flowmenter 3 shows is regulated the dilution water control valve 4 on the dilution water pipe 5 automatically, former ammoniacal liquor diluted, and be certain value to keep the ammoniacal liquor exit concentration; While is according to the changes in flow rate of total pipeline 6 or secondary lateral 11; Pressure transmitter 8 changes automatic induction pipe internal pressure with pressure transmitter 13; And feeding back to automatic controller 15, the rotating speed of automatic controller 15 control aqua ammonia pumps 2 cuts down the consumption of energy when satisfying technological requirement.
Ammoniacal liquor after accurate metering and distribution sprays into dore furnace through atomizing lance 14 with certain pressure, accomplishes whole spray ammonia automatic control process.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.
Claims (6)
1. an ammonia that is used for SNCR method denitrating flue gas sprays self-con-tained unit, comprises ammonia water tank, aqua ammonia pump; Said aqua ammonia pump inlet links to each other with ammonia water tank, and the aqua ammonia pump outlet utilizes total pipeline to link to each other with atomizing lance; It is characterized in that: also be provided with the ammoniacal liquor control valve on the said total pipeline, said ammoniacal liquor control valve links to each other with automatic controller; Also comprise the measuring instrument that is used to detect kiln exit gas temperature, flow, nitrogen oxide and ammonia concentration, said measuring instrument is connected with automatic controller.
2. the ammonia that is used for SNCR method denitrating flue gas according to claim 1 sprays self-con-tained unit, it is characterized in that: be provided with the dilution water pipe between said ammonia water tank and the aqua ammonia pump; Said dilution water pipe is provided with the dilution water control valve; Said dilution water control valve is connected with automatic controller; Total pipeline is provided with mass flowmenter, and said mass flowmenter is connected with automatic controller.
3. the ammonia that is used for SNCR method denitrating flue gas according to claim 1 sprays self-con-tained unit, and it is characterized in that: said total pipeline is provided with pressure transmitter; Said pressure transmitter is connected with automatic controller; Said aqua ammonia pump is connected with automatic controller.
4. the ammonia that is used for SNCR method denitrating flue gas according to claim 1 sprays self-con-tained unit, and it is characterized in that: described total pipeline derives some laterals; Said lateral is provided with branch's control valve; Branch's control valve is connected with automatic controller; Said lateral derives some secondary laterals, and said secondary lateral is connected with atomizing lance; The secondary lateral is provided with tiny flow quantity meter and the pressure transmitter that links to each other with automatic controller.
5. the ammonia that is used for SNCR method denitrating flue gas according to claim 4 sprays self-con-tained unit, and it is characterized in that: described branch control valve is the proportional integral control valve.
6. the ammonia that is used for SNCR method denitrating flue gas according to claim 2 sprays self-con-tained unit, and it is characterized in that: ammoniacal liquor control valve, dilution water control valve are the proportional integral control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220185789 CN202569946U (en) | 2012-04-27 | 2012-04-27 | Ammonia injection automatic control device for flue gas denitration by selective non-catalytic reduction (SNCR) method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220185789 CN202569946U (en) | 2012-04-27 | 2012-04-27 | Ammonia injection automatic control device for flue gas denitration by selective non-catalytic reduction (SNCR) method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438355A (en) * | 2013-08-19 | 2013-12-11 | 江苏新中环保股份有限公司 | Ammonia solution conveying device |
| CN103949149A (en) * | 2014-05-19 | 2014-07-30 | 佛山市合璟节能环保科技有限公司 | Flue gas denitration equipment |
| CN104001420A (en) * | 2014-06-09 | 2014-08-27 | 盐城工学院 | Flue gas SNCR (selective non-catalytic reduction) denitration control device and method |
| CN104826492A (en) * | 2015-04-23 | 2015-08-12 | 华北电力大学（保定） | Improvement method for selective catalytic reduction flue gas denitrification and ammonia injection control system |
| CN105749729A (en) * | 2016-05-15 | 2016-07-13 | 张波 | Ammonification system based on automatic-adjusted pH value |
| CN106362560A (en) * | 2016-10-13 | 2017-02-01 | 镇江金锐环保设备有限公司 | SNCR (selective non-catalytic reduction) denitrification system control unit |
| CN106474887A (en) * | 2016-11-09 | 2017-03-08 | 山西华仁通电力科技有限公司 | A kind of W flame high efficiency boiler denitrating system |
| CN106731553A (en) * | 2016-12-20 | 2017-05-31 | 天津华迈环保设备有限公司 | A kind of ammoniacal liquor feeding mechanism and method for flue gas SCR method denitration |
| CN111389219A (en) * | 2020-03-27 | 2020-07-10 | 浙江浙能技术研究院有限公司 | Ammonia injection control method for start-stop stage of coal-fired boiler |
| CN112717689A (en) * | 2019-10-28 | 2021-04-30 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Selective catalytic reduction denitration device and method |
| CN115337762A (en) * | 2022-10-13 | 2022-11-15 | 承德建龙特殊钢有限公司 | Automatic control system and method for tail flue gas low-temperature denitration agent |
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2012
- 2012-04-27 CN CN 201220185789 patent/CN202569946U/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438355B (en) * | 2013-08-19 | 2015-12-16 | 江苏新中环保股份有限公司 | A kind of ammonia spirit feedway |
| CN103438355A (en) * | 2013-08-19 | 2013-12-11 | 江苏新中环保股份有限公司 | Ammonia solution conveying device |
| CN103949149A (en) * | 2014-05-19 | 2014-07-30 | 佛山市合璟节能环保科技有限公司 | Flue gas denitration equipment |
| CN104001420A (en) * | 2014-06-09 | 2014-08-27 | 盐城工学院 | Flue gas SNCR (selective non-catalytic reduction) denitration control device and method |
| CN104001420B (en) * | 2014-06-09 | 2016-01-20 | 盐城工学院 | The control method of a kind of flue gas SNCR denitration control device and use thereof |
| CN104826492B (en) * | 2015-04-23 | 2017-02-22 | 华北电力大学（保定） | Improvement method for selective catalytic reduction flue gas denitrification and ammonia injection control system |
| CN104826492A (en) * | 2015-04-23 | 2015-08-12 | 华北电力大学（保定） | Improvement method for selective catalytic reduction flue gas denitrification and ammonia injection control system |
| CN105749729A (en) * | 2016-05-15 | 2016-07-13 | 张波 | Ammonification system based on automatic-adjusted pH value |
| CN106362560A (en) * | 2016-10-13 | 2017-02-01 | 镇江金锐环保设备有限公司 | SNCR (selective non-catalytic reduction) denitrification system control unit |
| CN106474887A (en) * | 2016-11-09 | 2017-03-08 | 山西华仁通电力科技有限公司 | A kind of W flame high efficiency boiler denitrating system |
| CN106474887B (en) * | 2016-11-09 | 2018-11-13 | 山西华仁通电力科技有限公司 | A kind of W flame Denitration in Boiler system |
| CN106731553A (en) * | 2016-12-20 | 2017-05-31 | 天津华迈环保设备有限公司 | A kind of ammoniacal liquor feeding mechanism and method for flue gas SCR method denitration |
| CN112717689A (en) * | 2019-10-28 | 2021-04-30 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Selective catalytic reduction denitration device and method |
| CN111389219A (en) * | 2020-03-27 | 2020-07-10 | 浙江浙能技术研究院有限公司 | Ammonia injection control method for start-stop stage of coal-fired boiler |
| CN115337762A (en) * | 2022-10-13 | 2022-11-15 | 承德建龙特殊钢有限公司 | Automatic control system and method for tail flue gas low-temperature denitration agent |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SICHUAN JUNHE ENVIRONMENTAL PROTECTION CO., LTD. Free format text: FORMER NAME: SICHUAN JUNHE ENVIRONMENTAL PROTECTION ENGINEERING CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 614008 Sichuan high tech Zone in Leshan City, the New South Road, No. 12 Patentee after: SICHUAN JUNHE ENVIRONMENTAL PROTECTION CO., LTD. Address before: 614008, Pioneer Park, hi tech Zone, 199 North Fenghuang Road, Sichuan, Leshan Patentee before: Sichuan Junhe Environmental Protection Engineering Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20170427 |