CN204073819U - Flue gas denitrification system spray ammonia adjusting device - Google Patents
Flue gas denitrification system spray ammonia adjusting device Download PDFInfo
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- CN204073819U CN204073819U CN201420486580.5U CN201420486580U CN204073819U CN 204073819 U CN204073819 U CN 204073819U CN 201420486580 U CN201420486580 U CN 201420486580U CN 204073819 U CN204073819 U CN 204073819U
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- control valve
- ammonia
- valve group
- cutting ball
- ball valve
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 156
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 74
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 239000003546 flue gas Substances 0.000 title claims abstract description 21
- 239000007921 spray Substances 0.000 title claims abstract description 16
- 239000012159 carrier gas Substances 0.000 claims abstract description 15
- 238000005507 spraying Methods 0.000 claims abstract description 12
- 238000010790 dilution Methods 0.000 claims description 13
- 239000012895 dilution Substances 0.000 claims description 13
- 230000009467 reduction Effects 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000000376 reactant Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000008717 functional decline Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The utility model discloses a kind of flue gas denitrification system spray ammonia adjusting device.This device comprises flowmeter, control valve, ammonia/air mixer, carrier gas air supply system and connecting line, wherein flowmeter is connected with ammonia/air mixer through control valve, carrier gas air supply system is also connected with ammonia/air mixer, ammonia/air mixer is connected with ammonia-gas spraying device, control valve is divided into the first control valve group, second control valve group and the 3rd cutting ball valve, first control valve group and the second control valve group are arranged in parallel, and the first control valve group is connected with flowmeter with one end of the second control valve group simultaneously, the other end be connected with the 3rd cutting ball valve simultaneously, 3rd cutting ball valve is connected with ammonia/air mixer.The utility model structure is simple, regulates the flow of ammonia according to different NOx concentration, controls object when reaching ammonia requirement wide region, high-precision real, ensure that the concentration of the NOx of discharge does not exceed standard, spray that ammonia is inexcessive, the reduction of the escaping of ammonia rate.
Description
technical field:
The utility model relates to a kind of flue gas denitrification system spray ammonia adjusting device, is applicable to denitration field, coal-burning power plant.
background technology:
Existing coal fired thermal power plant majority adopts selective catalytic reduction flue gas denitration technology (SCR) to carry out denitration.The system of catalysts selective reducing process stores primarily of reactor, catalyst and ammonia and spraying system formed, SCR denitration technology sprays into reactant in the flue gas of catalyst upstream, under the effect of catalyst in reactor, reactant is utilized to be nitrogen and water by the NOx conversion in flue gas.
In existing design, generally use the ammonia after liquefied ammonia, ammoniacal liquor or urea decomposition as reactant.No matter use ammonia in which way, all will first make ammonia evaporate, then mix after ammonia dilution with flue gas, finally sprayed in the flue gas of reactor upstream.In order to ensure that NOx has higher removal efficiency, qualified discharge, reduce again the escapement ratio of ammonia, so must the good ammonia flow of regulable control.
Current coal-fired boiler combustion process more complicated, coal-fired source, firing optimization, load variations etc. cause NOX change in concentration amplitude large.Existing denitrification apparatus is all consider by meeting maximum ammonia needs flow when ammonia regulable control valve type selecting, selects footpath at a gulp valve, contains maximum ammonia flow.When ammonia requirement is larger, valve regulated controls to meet the demands.But when ammonia requirement is less, valve opening reduces, operating point reduce, when operating point low to certain position time, valve regulating ratio reduces, regulate and relax, adjusting function declines, and degree of regulation reduces, and tracking performance difference can not real-time regulable control well, cause that SCR exit NOx concentration is instantaneous to exceed standard or to spray ammonia excessive, the escaping of ammonia rate increases.These problems are brought to boiler, denitrification apparatus safety and economic operation and NOx qualified discharge and are had a strong impact on.
Therefore, necessary the deficiency solving prior art is improved to prior art.
summary of the invention:
The utility model provides a kind of flue gas denitrification system to spray ammonia adjusting device to solve above-mentioned prior art Problems existing.
The technical scheme that the utility model adopts has:
A kind of flue gas denitrification system spray ammonia adjusting device, this device comprises flowmeter, control valve, ammonia/air mixer, carrier gas air supply system and connecting line, wherein flowmeter is connected with ammonia/air mixer through control valve, carrier gas air supply system is also connected with ammonia/air mixer, ammonia/air mixer is connected with ammonia-gas spraying device, described control valve is divided into the first control valve group, second control valve group and the 3rd cutting ball valve, first control valve group and the second control valve group are arranged in parallel, and the first control valve group is connected with flowmeter with one end of the second control valve group simultaneously, the other end be connected with the 3rd cutting ball valve simultaneously, 3rd cutting ball valve is connected with ammonia/air mixer.
Further, described first control valve group is connected in series by the first cutting ball valve and heavy caliber control valve and forms; Second control valve group is connected in series by the second cutting ball valve and small-bore control valve and forms.
Further, the rear side of the heavy caliber control valve in described first control valve group is also serially connected with the first manual cutting ball valve, and the rear side of the small-bore control valve in the second control valve group is also serially connected with the second manual cutting ball valve.
Further, the bore of described heavy caliber control valve is 1.5 ~ 3 times of the bore of small-bore control valve.
Further, described carrier gas air supply system comprises the first dilution wind, the second dilution air and dilutes distinguished and admirable gauge.
The utility model has following beneficial effect:
(1) heavy caliber and small-bore two control valves are arranged in parallel by the utility model, by calculating the size of ammonia requirement to the parameter such as NOx concentration, boiler load, by flow Discrete control, control object when reaching ammonia requirement wide region, high-precision real, thus ensure that the concentration of the NOx of discharge does not exceed standard, spray that ammonia is inexcessive, the reduction of the escaping of ammonia rate.
(2) the utility model is provided with two dilution airs, and the using and the reserved ensure that the reliability of the work of the utility model adjusting device, improve operating efficiency.
accompanying drawing illustrates:
Fig. 1 is mounting structure figure of the present utility model.
Fig. 2 is structure chart of the present utility model.
Wherein
1, flowmeter; 2, control valve; 3, pipeline; 4, ammonia/air mixer; 5, ammonia-gas spraying device; 6, carrier gas air supply system; 7, reactor; 8, boiler; 9, flue; 21, the first cutting ball valve; 22, heavy caliber control valve; 23, the second cutting ball valve; 24, small-bore control valve; 25, the 3rd cutting ball valve; 26, the first manual cutting ball valve; 27, the second manual cutting ball valve; 61, the first dilution air; 62, the second dilution air; 63, distinguished and admirable gauge is diluted.
detailed description of the invention:
Below in conjunction with accompanying drawing, the utility model is further described.
Please refer to Fig. 1, the utility model flue gas denitrification system spray ammonia adjusting device, the utility model device has pipeline 3, flowmeter 1, control valve 2 and ammonia/air mixer 4, wherein flowmeter 1 is connected with ammonia/air mixer 4 through the control valve 2 be arranged on pipeline 3, ammonia/air mixer 4 is connected with ammonia-gas spraying device 5, and ammonia-gas spraying device 5 is connected on the flue 9 on boiler.Control valve 2 is divided into the first control valve group, the second control valve group and the 3rd cutting ball valve 25, first control valve group and the second control valve group are arranged in parallel, and one end of the first control valve group and the second control valve group is connected with flowmeter 1 simultaneously, the other end be connected with the 3rd cutting ball valve 25 simultaneously; 3rd cutting ball valve 25 is connected with ammonia/air mixer 4.
Please refer to Fig. 2, the utility model needs different ammonia amount in order to the N Ox according to variable concentrations, control valve 2 is arranged to adjustable ammonia amount, control valve 2 comprises the first cutting ball valve 21, heavy caliber control valve 22, second cutting ball valve 23, small-bore control valve 24, 3rd cutting ball valve 25, first manual cutting ball valve 26 and the second manual cutting ball valve 27, wherein the first cutting ball valve 21, heavy caliber control valve 22 and the first manual cutting ball valve 26 are connected in series formation first control valve group successively, second cutting ball valve 23, small-bore control valve 24 and the second manual cutting ball valve 27 are connected in series formation second control valve group successively.Heavy caliber control valve 22 and small-bore control valve 24 are arranged in parallel, and the bore of heavy caliber control valve 22 is 1.5 ~ 3 times of the bore of small-bore control valve 24.All select equal percentage flow characteristic, the open range of control valve is 10% ~ 90% in theory, but in real work, maintains good adjusting function and precision to allow control valve, consider control valve mechanical performance, control valve opening scope is greatly about 30% ~ 80%.Specifically when operating, when ammonia requirement is larger, close small-bore control valve 24, regulable control is carried out with heavy caliber control valve 22, technological requirement can be met preferably, when to be reduced to heavy caliber control valve 22 aperture be about 30% to ammonia requirement, close heavy caliber control valve 22, regulable control is carried out with small-bore control valve 24, now the aperture of small-bore control valve 24 is about about 80%, as ammonia requirement continues to reduce, then small-bore control valve 24 aperture also continues to reduce, and precision meets technological requirement.
Please refer to Fig. 1, control set for adjusting of the present utility model also comprises carrier gas air supply system 6, carrier gas air supply system 6, carrier gas air supply system 6 is connected with ammonia/air mixer 4 through pipeline 3, ammonia/air mixer 4 is connected with ammonia-gas spraying device 5, and ammonia-gas spraying device 5 is connected on the flue 9 on boiler 8.Carrier gas air supply system 6 comprises the first dilution air 61, second dilution air 62 and dilutes distinguished and admirable gauge 63, two dilution airs and is arranged in parallel on pipeline 3, two dilution air the using and the reserved.
Please refer to Fig. 1 and Fig. 2, control set for adjusting of the present utility model is installed according to shown in Fig. 1, the NOx gas of the middle generation of boiler 8 is transported in flue 9, people are according to NOx concentration in boiler and boiler load, judge ammonia requirement, then open the first control valve group and the second control valve group according to ammonia requirement.
When ammonia requirement is large, open carrier gas air supply system 6 and the first control valve group, when opening the first control valve group, first close the second cutting ball valve 23 and the second manual cutting ball valve 27 in the second control valve group, then heavy caliber control valve 22 is opened, now ammonia arrives ammonia/air mixer 4 through the first control valve group, after mixing with air, flue 9 is sprayed into by ammonia device 5, after fully mixing with flue gas, enter reactor 7, selective catalytic reduction reaction is produced under the effect of the catalyst of NOx gas in reactor 7 of the middle generation of boiler 8, generate nitrogen and water, what complete NOx in flue gas removes work, the effect of the second manual cutting ball valve 27 prevents from the ammonia spraying into pipeline 3 from flowing back to come in the second control valve group, thus occur that refluence phenomenon damages small-bore control valve 24.3rd cutting ball valve 25 is arranged on the pipeline 3 on rear side of control valve 2, when reactor 7 stop transport or interlock protection action time, can cutting out pipeline 3 safely and reliably, play the effect of double insurance.
When ammonia requirement hour, open carrier gas air supply system 6 and the second control valve group, when opening the second control valve group, first close the first cutting ball valve 21 and the first manual cutting ball valve 26 in the first control valve group, then small-bore control valve 24 is opened, now ammonia arrives ammonia/air mixer 4 through the second control valve group, after mixing with air, flue 11 is sprayed into by ammonia spraying system, after fully mixing with flue gas, enter reactor 7, selective catalytic reduction reaction is produced under the effect of the catalyst of NOx gas in reactor 7 of the middle generation of boiler 8, generate nitrogen and water, what complete NOx in flue gas removes work.The effect of the first manual cutting ball valve 26 prevents from the ammonia spraying into pipeline 3 from flowing back to come in the first control valve group, thus occur refluence phenomenon infringement heavy caliber control valve 22.
The above is only preferred embodiment of the present utility model; should be understood that; for those skilled in the art, can also make some improvement under the prerequisite not departing from the utility model principle, these improvement also should be considered as protection domain of the present utility model.
Claims (5)
1. a flue gas denitrification system spray ammonia adjusting device, this device comprises flowmeter (1), control valve (2), ammonia/air mixer (4), carrier gas air supply system (6) and connecting line (3), wherein flowmeter (1) is connected with ammonia/air mixer (4) through control valve (2), carrier gas air supply system (6) is also connected with ammonia/air mixer (4), ammonia/air mixer (4) is connected with ammonia-gas spraying device (5), it is characterized in that: described control valve (2) is divided into the first control valve group, second control valve group and the 3rd cutting ball valve (25), first control valve group and the second control valve group are arranged in parallel, and the first control valve group is connected with flowmeter (1) with one end of the second control valve group simultaneously, the other end be connected with the 3rd cutting ball valve (25) simultaneously, 3rd cutting ball valve (25) is connected with ammonia/air mixer (4).
2. flue gas denitrification system spray ammonia adjusting device as claimed in claim 1, is characterized in that: described first control valve group is connected in series by the first cutting ball valve (21) and heavy caliber control valve (22) and forms; Second control valve group is connected in series by the second cutting ball valve (23) and small-bore control valve (24) and forms.
3. flue gas denitrification system spray ammonia adjusting device as claimed in claim 2, it is characterized in that: the rear side of the heavy caliber control valve (22) in described first control valve group is also serially connected with the first manual cutting ball valve (26), the rear side of the small-bore control valve (24) in the second control valve group is also serially connected with the second manual cutting ball valve (27).
4. flue gas denitrification system spray ammonia adjusting device as claimed in claim 2, is characterized in that: the bore of described heavy caliber control valve (22) is 1.5 ~ 3 times of the bore of small-bore control valve (24).
5. flue gas denitrification system spray ammonia adjusting device as claimed in claim 1, is characterized in that: described carrier gas air supply system (6) comprises the first dilution wind (61), the second dilution air (62) and the distinguished and admirable gauge of dilution (63).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420486580.5U CN204073819U (en) | 2014-08-27 | 2014-08-27 | Flue gas denitrification system spray ammonia adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420486580.5U CN204073819U (en) | 2014-08-27 | 2014-08-27 | Flue gas denitrification system spray ammonia adjusting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204073819U true CN204073819U (en) | 2015-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420486580.5U Active CN204073819U (en) | 2014-08-27 | 2014-08-27 | Flue gas denitrification system spray ammonia adjusting device |
Country Status (1)
| Country | Link |
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| CN (1) | CN204073819U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106908306A (en) * | 2017-01-19 | 2017-06-30 | 常州磐诺仪器有限公司 | A kind of intelligent on-line dilution prover |
| CN107051201A (en) * | 2017-05-31 | 2017-08-18 | 国电科学技术研究院 | A kind of ammonia injected system and method suitable for carbon base catalyst desulfuring and denitrifying apparatus |
| CN107497297A (en) * | 2016-12-29 | 2017-12-22 | 大唐环境产业集团股份有限公司 | A kind of denitration dilution wind heat-exchange system |
| CN108325357A (en) * | 2018-03-02 | 2018-07-27 | 国电环境保护研究院有限公司 | A kind of the supply adjusting method and SCR system of reducing agent |
| CN114682084A (en) * | 2022-03-28 | 2022-07-01 | 西安热工研究院有限公司 | Parallel denitration reducing agent flow adjusting system and method |
| CN114797466A (en) * | 2022-03-25 | 2022-07-29 | 贵州西电电力股份有限公司黔北发电厂 | Thermal power plant flue gas denitration system and method for processing denitration catalyst without shutdown |
-
2014
- 2014-08-27 CN CN201420486580.5U patent/CN204073819U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107497297A (en) * | 2016-12-29 | 2017-12-22 | 大唐环境产业集团股份有限公司 | A kind of denitration dilution wind heat-exchange system |
| CN106908306A (en) * | 2017-01-19 | 2017-06-30 | 常州磐诺仪器有限公司 | A kind of intelligent on-line dilution prover |
| CN107051201A (en) * | 2017-05-31 | 2017-08-18 | 国电科学技术研究院 | A kind of ammonia injected system and method suitable for carbon base catalyst desulfuring and denitrifying apparatus |
| CN108325357A (en) * | 2018-03-02 | 2018-07-27 | 国电环境保护研究院有限公司 | A kind of the supply adjusting method and SCR system of reducing agent |
| CN108325357B (en) * | 2018-03-02 | 2023-10-24 | 国电环境保护研究院有限公司 | SCR system of power plant boiler and reducing agent supply adjusting method thereof |
| CN114797466A (en) * | 2022-03-25 | 2022-07-29 | 贵州西电电力股份有限公司黔北发电厂 | Thermal power plant flue gas denitration system and method for processing denitration catalyst without shutdown |
| CN114682084A (en) * | 2022-03-28 | 2022-07-01 | 西安热工研究院有限公司 | Parallel denitration reducing agent flow adjusting system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 210013 No. 10 Pudong Road, Pukou District, Nanjing City, Jiangsu Province Patentee after: National Electric Environmental Protection Research Institute Co., Ltd. Address before: 210013 No. 10 Pudong Road, Pukou District, Nanjing City, Jiangsu Province Patentee before: State Power Environmental Protection Research Institute |
|
| CP01 | Change in the name or title of a patent holder |