CN113457396A - Ammonia spraying automatic control method based on SCR denitration control system of thermal power plant - Google Patents
Ammonia spraying automatic control method based on SCR denitration control system of thermal power plant Download PDFInfo
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- CN113457396A CN113457396A CN202110723804.4A CN202110723804A CN113457396A CN 113457396 A CN113457396 A CN 113457396A CN 202110723804 A CN202110723804 A CN 202110723804A CN 113457396 A CN113457396 A CN 113457396A
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 194
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 97
- 238000005507 spraying Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000002347 injection Methods 0.000 claims abstract description 59
- 239000007924 injection Substances 0.000 claims abstract description 59
- 239000000779 smoke Substances 0.000 claims abstract description 14
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 11
- 230000023556 desulfurization Effects 0.000 claims abstract description 11
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 239000011593 sulfur Substances 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 230000003247 decreasing effect Effects 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 235000013399 edible fruits Nutrition 0.000 claims description 34
- 239000010409 thin film Substances 0.000 claims description 34
- 230000000694 effects Effects 0.000 claims description 18
- 230000001276 controlling effect Effects 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 28
- 238000011217 control strategy Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/30—Controlling by gas-analysis apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8696—Controlling the catalytic process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
Abstract
An automatic ammonia injection control method based on an SCR denitration control system of a thermal power plant. NO measured by desulfurization clean smoke in prior artXNO lag behind denitration sideXThe deviation exists, the economical efficiency and the safety of the automatic operation of the ammonia injection after the transformation cannot be met, and great troubles are brought to operators. The method of the invention comprises the following steps: to remove sulfur and purify smoke NOXMeasurement of value and denitration side NOXConverting the measured value into a PV value in an ammonia injection automatic control system according to the proportion of 8: 2; in the automatic control, multiplying the variable load feedforward in the AGC by 0.3, multiplying the desulfurization clean smoke NOx value by 0.7, introducing the result into the feedforward of the ammonia injection automatic control after a conversion function; when the device is automatically put into use, the ammonia injection automatic control system is introduced with the ammonia injection adjustment entrance guard increasing and decreasing logic, and when NO is in useXHourly mean greater thanDuring 47mg/m cultivation, automatically controlling parameters of ammonia spraying automatic regulating gate to be forbidden to be reduced, and when NO is carried outXAnd when the hourly average value is less than 32mg/m, forbidding increasing of automatic control parameters of the ammonia spraying automatic regulating gate. The invention relates to an automatic ammonia injection control method for an SCR denitration control system of a thermal power plant.
Description
Technical Field
The invention relates to an automatic ammonia injection control method based on an SCR denitration control system of a thermal power plant.
Background
The SCR denitration ammonia spraying automatic system of the thermal power plant unit mainly controls the input amount of ammonia by controlling an A, B side ammonia spraying automatic regulating valve, thereby reducing NOXThe discharge amount is controlled by cascade PID in the original logic, and is respectively applied to the NO of the boiler A, B side reactorXThe numerical control will now be described by taking the control logic on the a side as an example: side A NOXControlling the main control loop to pass through the A side denitration outlet NOXThe actual measured PV value is compared with an ideal SP value manually set by an operator, the difference value enters a main control PID controller for operation, the calculated ammonia flow is used as the SP value of a secondary control loop, the actual measured ammonia flow value is used as the PV value of the secondary control loop, the secondary control loop passes through a PI arithmetic unit according to the deviation value and then is output to an MA station, the MA station sends an instruction to control the operation of a local valve, wherein NO at an inlet of the A sideXIntroduced into the main PID control loop as a feed forward;
the defects or shortcomings in the prior art are as follows: the analysis of the automatic ammonia injection condition after the ultra-low emission modification shows that NO measured by the desulfurization clean smokeXNO lag behind denitration sideXAnd often have great deviation, above-mentioned control strategy has been unable to satisfy the economy and the security of spouting ammonia automatic operation after the ultralow transformation, consequently spouts ammonia automatic control and changes manual control into, brings very big puzzlement for the operation personnel.
Only the NO on the denitration side in the denitration ammonia injection automatic original control logic of a certain thermal power plant unitXAutomatically controlled, and the desulfurization and smoke purification NO often appears in the process of automatic control of ammonia injectionXNumerical value and denitration side NOXThe large numerical deviation causes the poor automatic control input effect of the denitration ammonia injection; therefore, the operators basically abandon the automatic control of denitration ammonia injection and change the automatic control into manual control, thereby greatly increasing the labor intensity of the operators, and simultaneouslyIn the manual control ammonia spraying process, the phenomenon of large ammonia escape amount of a unit is caused by excessive ammonia spraying amount, the large ammonia escape amount of the unit not only influences the economy of denitration of the unit, but also easily causes potential safety hazards such as corrosion of an air preheater, crystallization blockage, over-standard ammonia concentration in ash slag and the like due to excessive ammonia spraying; in order to solve the problem that the automatic ammonia injection control cannot be put into use after ultra-low emission reconstruction, a novel automatic ammonia injection control method needs to be designed and put into use after debugging.
Disclosure of Invention
The invention aims to provide an ammonia injection automatic control method based on an SCR denitration control system of a thermal power plant, which adopts the ammonia injection automatic control method and optimizes and adjusts the ammonia injection automatic control parameters, thereby solving the problem of NO (nitric oxide) in the prior art due to desulfurization and denitrationXThe problem that denitration ammonia injection can not be automatically input due to large numerical deviation is solved, the labor intensity of operators is reduced, and the economical efficiency and the safety of unit ammonia injection are greatly improved while the evaluation indexes of environmental protection bureau on flue gas data are met.
The above purpose is realized by the following technical scheme:
an ammonia injection automatic control method based on an SCR denitration control system of a thermal power plant comprises the following steps:
(1) firstly, designing an automatic ammonia injection control logic and a control method thereof as follows:
to remove sulfur and purify smoke NOXMeasurement of value and denitration side NOXConverting the measured value into a PV value in an ammonia injection automatic control system according to the proportion of 8: 2;
in the automatic control, multiplying the variable load feedforward in the AGC by 0.3, multiplying the desulfurization clean smoke NOx value by 0.7, introducing the result into the feedforward of the ammonia injection automatic control after a conversion function;
when the device is automatically put into use, the ammonia injection automatic control system is introduced with the ammonia injection adjustment entrance guard increasing and decreasing logic, and when NO is in useXWhen the average hourly speed is greater than 47mg/m, prohibiting the automatic control parameter of the ammonia spraying automatic regulating gate from being reduced, and when NO is in lineXWhen the hourly mean value is less than 32mg/m, forbidding increasing of automatic control parameters of an ammonia spraying automatic regulating gate;
the newly added logic removal function is set, and logic with unobvious effect can be removed according to the logic input effect;
(2) designing and configuring in a DCS control system according to the ammonia injection automatic control method designed in the step (1), wherein the specific scheme is as follows:
designing and newly adding the ammonia spraying automatic control logic in the step (1) in the COMPOSITER logic software; then downloading the modified control logic to a logic controller; inputting the modified control logic, and optimizing and adjusting the ammonia spraying automatic control number according to the ammonia spraying automatic control effect;
recording the automatic control parameters and control effect of ammonia injection after debugging; after each control index is qualified, that is, NOXAnd (3) carrying out constant value perturbation 15mg/m and constant value perturbation when the set value is changed by 20mg/m for carrying out the thin film fruit trees and the thin film fruit trees are both subjected to the constant value perturbation, carrying out constant value perturbation 15mg/m for carrying out the thin film fruit trees and the thin film fruit trees, carrying out the thin film fruit trees and the thin film fruit trees at the constant value of 0.75-0.95, carrying out constant value perturbation 15mg/m for carrying out the thin film fruit trees and the thin film fruit trees at the constant value of less than 5min for carrying out the thin film fruit trees and the thin film fruit trees at the dynamic deviation of less than +/-20 mg/m for carrying out the thin film fruit trees and the thin film fruit trees for carrying out the thin film fruit trees and carrying out the thin film fruit trees for carrying out the thin film fruit trees and the thin film fruit trees for carrying out the thin film fruit trees.
Has the advantages that:
1. the invention relates to an ammonia injection automatic control method based on an SCR denitration control system of a thermal power plant, which solves the problem of NO (nitric oxide) in the prior art due to desulfurization and denitration by adopting an ammonia injection automatic control method and optimizing and adjusting ammonia injection automatic control parametersXThe problem that denitration ammonia injection can not be automatically input due to large numerical deviation is solved, the labor intensity of operators is reduced, and the economical efficiency and the safety of unit ammonia injection are greatly improved while the evaluation indexes of environmental protection bureau on flue gas data are met.
2. After the control logic transformation is completed, the automatic ammonia injection control is put into operation when the unit operates, the automatic control parameters are set and the curve is found, the control method obviously improves the denitration ammonia injection automatic control effect of the thermal power plant, and realizes the full-load normal input of the automatic ammonia injection control of the unit.
3. The method of the invention can ensure that the boiler side ammonia injection can automatically carry out desulfurization and smoke purification on NOXThe numerical control is more accurate, stable and rapid, and the method has the advantages of stronger adaptability and the like.
Description of the drawings:
FIG. 1 is a logic diagram of automatic ammonia injection control of the SCR denitration system of the unit.
FIG. 2 is a graph of an automatic ammonia injection control for the unit SCR denitration system of the invention.
FIG. 3 is a graph showing the automatic ammonia injection control effect of the unit SCR denitration system of the invention.
The specific implementation mode is as follows:
example 1:
an ammonia injection automatic control method based on an SCR denitration control system of a thermal power plant comprises the following steps:
(1) firstly, designing an automatic ammonia injection control logic and a control method thereof as follows:
to remove sulfur and purify smoke NOXMeasurement of value and denitration side NOXConverting the measured value into a PV value in an ammonia injection automatic control system according to the proportion of 8: 2;
in the automatic control, multiplying the variable load feedforward in the AGC by 0.3, multiplying the desulfurization clean smoke NOx value by 0.7, introducing the result into the feedforward of the ammonia injection automatic control after a conversion function;
when the device is automatically put into use, the ammonia injection automatic control system is introduced with the ammonia injection adjustment entrance guard increasing and decreasing logic, and when NO is in useXWhen the average hourly speed is greater than 47mg/m, prohibiting the automatic control parameter of the ammonia spraying automatic regulating gate from being reduced, and when NO is in lineXWhen the hourly mean value is less than 32mg/m, forbidding increasing of automatic control parameters of an ammonia spraying automatic regulating gate;
the newly added logic removal function is set, and logic with unobvious effect can be removed according to the logic input effect;
(2) designing and configuring in a DCS control system according to the ammonia injection automatic control method designed in the step (1), wherein the specific scheme is as follows:
designing and newly adding the ammonia spraying automatic control logic in the step (1) in the COMPOSITER logic software; then downloading the modified control logic to a logic controller; inputting the modified control logic, and optimizing and adjusting the ammonia spraying automatic control number according to the ammonia spraying automatic control effect;
recording the automatic control parameters and control effect of ammonia injection after debugging; after each control index is qualified, that is, NOXPerforming constant perturbation 15mg/m cultivation when set value is changed by 20mg/m, performing constant perturbation 15mg/m cultivation when the decay rate is 0.75-0.95 and the stabilization time is less than 15min, and performing transitionAnd carrying out the cultivation in less than 5min, wherein the dynamic deviation is less than +/-20 mg/m, and putting the cultivation into production and use.
Through tests, the automatic control logic of ammonia injection after the unit SCR denitration system is modified is shown in figure 1; in the thermal power generating unit based on the SCR denitration control system, the logic has good application and popularization prospects, through operation and observation after modification, the control strategy greatly reduces the labor intensity of operators, improves the economy and safety of unit denitration, achieves the optimal ammonia spraying control effect, and solves the problem of poor automatic ammonia spraying effect of the unit SCR denitration of the thermal power generating unit;
as shown in fig. 2, after the ammonia injection control strategy is modified and the control parameters are set, the denitration of the thermal power plant is automatically controlled by the ammonia injection, and when the working condition of the unit is stable, the automatic ammonia injection effect is good;
as shown in FIG. 3, the desulfurization clean smoke NOXResetting the hourly mean value, carrying out early hourly mean value of 43mg/m, and automatically controlling ammonia spraying to remove sulfur and smoke NO at the end of the hourXThe average hourly weight can reach 47mg/m, so that the qualification of environmental protection assessment values is guaranteed, the excessive ammonia spraying amount is reduced, the denitration control is more economic, and the harm of ammonia escape to a unit air preheater and a flue is reduced.
Claims (1)
1. An ammonia spraying automatic control method based on an SCR denitration control system of a thermal power plant is characterized by comprising the following steps: the method comprises the following steps:
(1) firstly, designing an automatic ammonia injection control logic and a control method thereof as follows:
to remove sulfur and purify smoke NOXMeasurement of value and denitration side NOXConverting the measured value into a PV value in an ammonia injection automatic control system according to the proportion of 8: 2;
in the automatic control, multiplying the variable load feedforward in the AGC by 0.3, multiplying the desulfurization clean smoke NOx value by 0.7, introducing the result into the feedforward of the ammonia injection automatic control after a conversion function;
when the device is automatically put into use, the ammonia injection automatic control system is introduced with the ammonia injection adjustment entrance guard increasing and decreasing logic, and when NO is in useXWhen the average hourly speed is greater than 47mg/m, prohibiting the automatic control parameter of the ammonia spraying automatic regulating gate from being reduced,when NO is presentXWhen the hourly mean value is less than 32mg/m, forbidding increasing of automatic control parameters of an ammonia spraying automatic regulating gate;
the newly added logic removal function is set, and logic with unobvious effect can be removed according to the logic input effect;
(2) designing and configuring in a DCS control system according to the ammonia injection automatic control method designed in the step (1), wherein the specific scheme is as follows:
designing and newly adding the ammonia spraying automatic control logic in the step (1) in the COMPOSITER logic software; then downloading the modified control logic to a logic controller; inputting the modified control logic, and optimizing and adjusting the ammonia spraying automatic control number according to the ammonia spraying automatic control effect;
recording the automatic control parameters and control effect of ammonia injection after debugging; after each control index is qualified, that is, NOXAnd (3) carrying out constant value perturbation 15mg/m and constant value perturbation when the set value is changed by 20mg/m for carrying out the thin film fruit trees and the thin film fruit trees are both subjected to the constant value perturbation, carrying out constant value perturbation 15mg/m for carrying out the thin film fruit trees and the thin film fruit trees, carrying out the thin film fruit trees and the thin film fruit trees at the constant value of 0.75-0.95, carrying out constant value perturbation 15mg/m for carrying out the thin film fruit trees and the thin film fruit trees at the constant value of less than 5min for carrying out the thin film fruit trees and the thin film fruit trees at the dynamic deviation of less than +/-20 mg/m for carrying out the thin film fruit trees and the thin film fruit trees for carrying out the thin film fruit trees and carrying out the thin film fruit trees for carrying out the thin film fruit trees and the thin film fruit trees for carrying out the thin film fruit trees.
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Cited By (1)
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| CN113985825A (en) * | 2021-10-20 | 2022-01-28 | 大唐湘潭发电有限责任公司 | Method for optimizing SCR denitration system based on DCS |
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