CN216604710U - Accurate ammonia spraying automatic control device for thermal generator set - Google Patents
Accurate ammonia spraying automatic control device for thermal generator set Download PDFInfo
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- CN216604710U CN216604710U CN202122090362.2U CN202122090362U CN216604710U CN 216604710 U CN216604710 U CN 216604710U CN 202122090362 U CN202122090362 U CN 202122090362U CN 216604710 U CN216604710 U CN 216604710U
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- ammonia spraying
- automatic control
- partition
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 275
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 148
- 238000005507 spraying Methods 0.000 title claims abstract description 46
- 238000002347 injection Methods 0.000 claims abstract description 41
- 239000007924 injection Substances 0.000 claims abstract description 41
- 238000005192 partition Methods 0.000 claims abstract description 28
- 238000011217 control strategy Methods 0.000 claims abstract description 11
- 238000004458 analytical method Methods 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims description 20
- 238000000738 capillary electrophoresis-mass spectrometry Methods 0.000 claims description 13
- 238000013461 design Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 10
- 239000003546 flue gas Substances 0.000 abstract description 10
- 238000000605 extraction Methods 0.000 abstract description 6
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses an automatic control device for accurate ammonia injection for a thermal generator set, which comprises a plurality of flue gas extraction and analysis systems, an ammonia injection grid partition system and an automatic control system for accurate ammonia injection, wherein each flue gas extraction and analysis system comprises a sampler; the sampler is connected with the sampling branch pipe, and the analysis branch pipe is separated from the sampling branch pipe and enters the analyzer; the ammonia spraying grid subareas comprise an ammonia spraying header pipe, the ammonia spraying header pipe is divided into ammonia spraying subarea branch pipes, and an ammonia flow meter and a subarea leveling valve are arranged on the ammonia spraying subarea branch pipes; the accurate ammonia spraying automatic control system comprises a PLC controller and an automatic leveling control strategy. According to the utility model, the joint adjustment of each partition ammonia spraying adjusting valve and the corresponding multi-partition flue gas extraction analyzer is realized through the PLC and a control strategy, so that an accurate ammonia spraying automatic control system is formed, the automatic adjustment uniformity of NOx concentration of each partition is ensured, the uneven ammonia spraying is prevented, the accurate control is realized, and the energy conservation and emission reduction are finally realized.
Description
Technical Field
The utility model relates to the technical field of thermal power generation denitration, in particular to an automatic control device for accurate ammonia spraying of a thermal power generation unit.
Background
Along with the increase of the monitoring strength of the national environmental protection department on the emission of the atmospheric pollutants, the environmental protection supervision requirements of the national power grid on the coal-fired unit are higher and higher, wherein the regulation of bringing the flue gas denitration facilities of the coal-fired unit into operation examination and management is provided. In order to protect the atmospheric environment, the flue gas in the coal-fired unit is purified to denitrate and spray ammonia.
The flue spouts ammonia and is used the SCR denitration reaction principle as leading to, and SCR denitration reaction is influenced greatly by flue gas flow field distribution, and the flue cross-section is big, and each subregion NOx distributes inhomogeneous and leads to, spouts ammonia in step and leads to spouting and cause the ammonia escape, and simultaneously, denitration control can't be stable, so advance accurate ammonia injection to it and reform transform to this problem.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an automatic control device for accurate ammonia spraying for a thermal power generating set, which has the advantage of automatically adjusting an ammonia spraying adjusting valve to achieve uniform ammonia spraying and solves the problems of instability of an ammonia spraying system, non-uniform flow field distribution, serious system over-spraying, serious ammonia escape, ammonia waste, ammonia pollution and the like commonly found on an ammonia spraying system of a power generation enterprise.
In order to achieve the purpose, the utility model provides the following technical scheme:
the utility model provides an accurate ammonia automatic control device that spouts for thermal generator set, is located to spout the ammonia house steward including spouting ammonia mother pipe, air pipeline, mother's pipe electrically operated gate and spouting ammonia flow control valve, spouts ammonia flow control valve, is the adjustment mechanism who spouts ammonia system total amount control, spout ammonia flow control valve rear end design ammonia air-to-air blender, make ammonia and air intensive mixing, produce the denitration reductant, will spout ammonia mother behind the air-to-air blender and divide the reposition of redundant personnel into a plurality of ammonia branch pipes that spout, respectively design one set of empty ammonia mixed flowmeter and empty ammonia mixed flow control valve on spouting the ammonia branch pipe, CEMS detecting instrument arranges in reactor sampling end flue position, and CEMS detecting instrument adopts each subregion one-to-one arrangement mode.
An air-ammonia mixed flow meter and an air-ammonia mixed flow regulating valve are respectively designed on the pipeline of each ammonia injection branch pipe, and each partition (A1 partition and ammonia injection partition) corresponds to one CEMS detection instrument device and an ammonia escape analysis instrument.
The system comprises a plurality of flue gas extraction and analysis systems, an ammonia injection grid partition system and an accurate ammonia injection automatic control system, wherein each flue gas extraction and analysis system comprises a sampler; the sampler is connected with the sampling branch pipe, and the analysis branch pipe is separated from the sampling branch pipe and enters the analyzer; the ammonia spraying grid subarea comprises an ammonia spraying main pipe, the ammonia spraying main pipe is divided into ammonia spraying subarea branch pipes, and an ammonia flow meter and a subarea leveling valve are arranged on the ammonia spraying subarea branch pipes; the accurate ammonia spraying automatic control system comprises a PLC controller and an automatic leveling control strategy.
According to the utility model, the joint adjustment of each partition ammonia spraying adjusting valve and the corresponding multi-partition flue gas extraction analyzer is realized through the PLC and a control strategy, so that an accurate ammonia spraying automatic control system is formed, the automatic adjustment uniformity of NOx concentration of each partition is ensured, the uneven ammonia spraying is prevented, the accurate control is realized, and the energy conservation and emission reduction are finally realized.
Preferably, the ammonia injection grid is distributed in a subarea mode, the distribution mode is obtained by modeling a flue flow field, the SCR is used as a basic structure, the grid is divided into n areas, n is greater than 1, and the grid in each area comprises a branch pipe regulating valve for controlling the ammonia injection flow.
Preferably, the flue is divided into n areas according to grid subareas, each subarea corresponds to one set of CEMS sampling devices, and the concentration distribution condition of NOx in each subarea of the whole flue is comprehensively measured.
Preferably, the accurate ammonia spraying automatic controller is arranged in a small room of an on-site CEMS analyzer, the analyzer measures concentration data of Nox of each subarea and converts the concentration data into 4-20mA electric signals to be transmitted to a PLC controller, meanwhile, ammonia spraying flow signals, valve opening signals and the like of branch pipes of each subarea are collected, and concentration subarea uniform automatic control is carried out on the ammonia spraying regulating valves of the branch pipes through operation.
Preferably, the ammonia injection leveling control strategy adopts a decoupling control strategy, solves the coupling problem of the regulating valves of all branch pipes of the partitioned ammonia injection to the concentration of the Nox of the whole flue partition, and achieves the control effect of uniform concentration of the Nox of all the partitions.
Preferably, the accurate ammonia injection control device is combined with a DCS denitration automatic control strategy, a control scheme that DCS is used for carrying out main pipe gate regulation ammonia injection total amount control and PLC is used for carrying out branch pipe leveling control is adopted, and the ammonia injection control system is adjusted in a coordinated mode, so that the optimal ammonia amount adjusting effect is achieved.
Compared with the prior art, the utility model has the following beneficial effects:
1. the accurate ammonia injection control device disclosed by the utility model solves the problem that nitrogen oxides exceed standards while ammonia escapes finally due to the phenomenon of over-injection and under-injection caused by incomplete ammonia injection reaction or insufficient ammonia injection in each region due to uneven concentration distribution in each region in a flue based on a design scheme of partition adjustment, improves the stability of a denitration control system, realizes accurate ammonia injection, and realizes energy conservation and emission reduction.
2. According to the utility model, through a decoupling control strategy and the design of a PLC (programmable logic controller), the problems of difficult subarea leveling control and unstable adjusting system caused by the characteristic of large reaction coupling of each subarea in the subarea leveling control process are solved, and the control effects of coupling adjustment and quick leveling of each subarea are achieved.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure: 1. spraying ammonia to the mother pipe; 2. an air line; 3. a main pipe electric door; 4. a main pipe regulating valve; 5. an ammonia-air mixer; 6. an ammonia spraying branch pipe I; 7. an ammonia spraying branch pipe II; 8. an ammonia spraying branch pipe III; 9. an air-ammonia mixing flow meter; 10. an air-ammonia mixed flow regulating valve; 11. a CEMS analyzer 1; 12. an ammonia escape analysis meter; 13. a1 partition; 14. spraying ammonia and partitioning; 15. a flue sampling terminal; 16. a PLC controller.
Detailed Description
For better clarity of technical objects, technical solutions and advantages of the present invention, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, an accurate ammonia injection automatic control device for a thermal generator set comprises an ammonia injection main pipe 1, an air pipeline 2, a main pipe electric door 3 and an ammonia injection flow regulating valve 4, wherein the ammonia injection flow regulating valve 4 is located in the ammonia injection main pipe 1 and is a regulating mechanism for controlling the total amount of an ammonia injection system, an ammonia air mixer 5 is designed at the rear end of the ammonia injection flow regulating valve 4 to fully mix ammonia gas and air to generate a denitration reducing agent, and the ammonia injection main pipe is divided into a plurality of ammonia injection branch pipes after the ammonia air mixer 5, and the ammonia injection branch pipes are respectively: the ammonia spraying branch pipe I6, the ammonia spraying branch pipe II 7 and the ammonia spraying branch pipe III 8; a set of air-ammonia mixed flow meter 9 and an air-ammonia mixed flow regulating valve 10 are respectively designed on the ammonia injection branch pipes, a CEMS detection instrument 11 is arranged at a flue position 15 at the sampling end of the reactor, and the CEMS detection instrument 11 is arranged in a one-to-one correspondence manner in each partition.
An air-ammonia mixing flow meter 9 and an air-ammonia mixing flow regulating valve 10 are designed on the pipeline of each ammonia injection branch pipe, and each partition (A1 partition 13 and ammonia injection partition 14) corresponds to one CEMS detection instrument 11 device and an ammonia escape analysis instrument 12.
The accurate ammonia spraying automatic control system also comprises a PLC (programmable logic controller) 16, and the concentration of Nox at the outlet of each partition is automatically adjusted to be balanced by adopting a decoupling control strategy.
The accurate ammonia spraying is that the mass concentration of the NOx at the outlet of the SCR reactor is uniformly divided by a design of dividing the ammonia spraying zone. The conventional ammonia injection control is that the whole ammonia volume of spouting is controlled through the aperture of spouting the female pipe governing valve of ammonia to reach the mode of control NOx concentration, nevertheless because of each regional flue gas composition of flue is different, lead to same even ammonia of spouting to lead to the fact each regional reaction condition different, finally cause the extravagant, ammonia escape, the not good problem of NOx control effect of ammonia.
The accurate ammonia injection zone control system comprises an ammonia injection main pipe control and regulation system, ammonia injection flow regulating valves of branch pipes of each zone, a mixed flow meter of the branch pipes of each zone, CEMS detection instruments of each zone and ammonia escape detection instruments of each zone, wherein the zones of an ammonia injection grid are designed and divided by environment protection professionals through modeling calculation.
An ammonia injection balance decoupling control strategy is established in the PLC, the air-ammonia mixed flow regulating valves of all the subareas are regulated, various errors are eliminated, and mass concentration deviation of Nox at the outlets of all the subareas is reduced as much as possible, so that the aims of reducing the consumption of reducing agents and controlling the level of ammonia escape are fulfilled.
Firstly, establishing a many-to-many modeling, sequentially carrying out a step disturbance test on a single partition regulating valve, collecting disturbance quantity of each partition regulating valve and NOx concentration data of an outlet of each partition, taking 6 partitions as an example to obtain 6 × 6 groups of step disturbance data, processing the data, establishing a plurality of partition NOx concentration models corresponding to the single partition regulating valve by adopting a PSO algorithm, and finally obtaining 6 × 6 models.
The design structure control loop is shown in the figure, wherein the input is the mean value of NOx concentration measured values at the outlets of a plurality of subareas, the output is the measured value of NOx concentration at the outlet of a single subarea, the system controller adopts PID control, the feedforward compensator is obtained by calculation according to the model in the step (1), and the controlled coupling system is a controlled object of the system. According to the number of the subareas, n x (n-1) feedforward compensation links (n is the number of the subareas) need to be established, and when the concentration of NOx at the outlet of a single subarea deviates, the decoupling control finally achieves the aim of balance control by changing a plurality of subarea adjusting valves.
The decoupling control aims at controlling the mean value of the concentration of Nox at the outlet of each subarea, and adjusts the ammonia spraying flow regulating valve of the branch pipe of each subarea to balance the concentration of each subarea.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a accurate ammonia automatic control device that spouts for thermal generator set, includes and spouts ammonia female pipe (1), air pipeline (2), female pipe electrically operated gate (3) and spout ammonia flow control valve (4), its characterized in that: spout ammonia flow control valve (4) and be located on spouting the female pipe of ammonia (1), be the adjustment mechanism who spouts ammonia system total amount control, spout ammonia flow control valve (4) rear end design ammonia air-fuel mixer (5), make ammonia and air intensive mixing, produce the denitration reductant, ammonia air-fuel mixer (5) rear end will spout the female pipe reposition of redundant personnel of ammonia and be a plurality of ammonia branch pipes that spout, spout and respectively design one set of empty ammonia mixing flow meter (9) and empty ammonia mixing flow control valve (10) on the ammonia branch pipe, arrange CEMS instrumentation (11) in reactor sampling end flue position (15), CEMS instrumentation (11) adopt each subregion one-to-one arrangement mode.
2. The accurate ammonia spraying automatic control device for the thermal generator set according to claim 1, characterized in that: and the pipeline of each ammonia injection branch pipe is provided with an air-ammonia mixing flow meter (9) and an air-ammonia mixing flow regulating valve (10).
3. The accurate ammonia spraying automatic control device for the thermal generator set according to claim 1, characterized in that: each partition corresponds to one of the CEMS detection meter (11) device and the ammonia escape analysis meter (12).
4. The accurate ammonia spraying automatic control device for the thermal generator set according to claim 1, characterized in that: the accurate ammonia spraying automatic control system also comprises a PLC (programmable logic controller) (16), and the concentration balance of Nox at the outlet of each partition is automatically adjusted by adopting a decoupling control strategy.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122090362.2U CN216604710U (en) | 2021-08-31 | 2021-08-31 | Accurate ammonia spraying automatic control device for thermal generator set |
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| CN202122090362.2U CN216604710U (en) | 2021-08-31 | 2021-08-31 | Accurate ammonia spraying automatic control device for thermal generator set |
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| CN216604710U true CN216604710U (en) | 2022-05-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114984756A (en) * | 2022-06-22 | 2022-09-02 | 华能国际电力股份有限公司上安电厂 | Ammonia spraying leveling system and method based on CEMS analyzer |
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2021
- 2021-08-31 CN CN202122090362.2U patent/CN216604710U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114984756A (en) * | 2022-06-22 | 2022-09-02 | 华能国际电力股份有限公司上安电厂 | Ammonia spraying leveling system and method based on CEMS analyzer |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240119 Address after: 010200 Yanshanying Township, Toktuo County, Hohhot City, Inner Mongolia Autonomous Region Patentee after: INNER MONGOLIA DATANG INTERNATIONAL TUOKETUO POWER GENERATION Co.,Ltd. Address before: No.1299 Ya'an Road, Beihu science and Technology Development Zone, Changchun City, Jilin Province Patentee before: DATANG NORTHEAST ELECTRIC POWER TEST & RESEARCH INSTITUTE Co.,Ltd. |
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| TR01 | Transfer of patent right |