CN113813754B - Industrial enterprise emission pollution optimization automatic control method and system - Google Patents
Industrial enterprise emission pollution optimization automatic control method and system Download PDFInfo
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- CN113813754B CN113813754B CN202110394722.XA CN202110394722A CN113813754B CN 113813754 B CN113813754 B CN 113813754B CN 202110394722 A CN202110394722 A CN 202110394722A CN 113813754 B CN113813754 B CN 113813754B
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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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
- B01D53/34—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
- B01D53/90—Injecting reactants
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- B01D2251/2062—Ammonia
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Abstract
The invention discloses an optimization automatic control method and system for industrial enterprise emission pollution, which are used for filtering the received nitrogen oxide concentration data at an inlet based on a preconfigured data filtering rule, performing forward control on the effective data obtained after the filtering, and determining a reference value of the current participation in controlling the ammonia spraying amount; filtering the received nitrogen oxide concentration data at the outlet based on a pre-configured data filtering rule, reversely controlling the effective data obtained after filtering, and determining an adjusting value of the current participation in controlling the ammonia spraying amount; and determining the value of ammonia injection at the next moment according to the reference value of the ammonia injection amount and the regulating value given by the inverse control system. According to the scheme, the ammonia spraying amount is automatically controlled and regulated from the data layer, so that the nitrogen oxides at the outlet are ensured not to exceed the set value, and a large amount of manpower and material resources are saved.
Description
Technical Field
The invention relates to the technical field of ammonia injection control, in particular to an optimized automatic control method and system for emission pollution of industrial enterprises.
Background
At present, industrial enterprises at home and abroad mostly adopt a method of manually adding ammonia spraying for controlling the concentration of nitrogen oxides at the outlet, namely, manual shift stares at the concentration of nitrogen oxides at the outlet, and when the concentration of nitrogen oxides exceeds the standard, the dosage of ammonia spraying at the inlet is immediately increased.
However, the existing manual ammonia injection method not only requires a large amount of manpower, but also can cause liquid ammonia waste and out-of-standard nitrogen oxides because of manual failure of accurate regulation.
Disclosure of Invention
In order to solve the technical problems, the invention provides an ammonia spraying automatic control method and system for exceeding the standard of nitrogen oxides discharged by industrial enterprises, which can effectively control the nitrogen oxides of outlet pollutants not to exceed the standard, and the regulation and control effect is far beyond manual regulation and control.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
an optimized self-control method for industrial enterprise emission pollution, the method comprising:
Based on a pre-configured data filtering rule, filtering the received nitrogen oxide concentration data at the inlet, performing forward control on effective data obtained after filtering, and determining a reference value of the current participation in controlling the ammonia injection amount, wherein the reference value is a function of the inlet nitrogen oxide concentration;
Based on a pre-configured data filtering rule, filtering the received nitrogen oxide concentration data at the outlet, reversely controlling the effective data obtained after filtering, and determining an adjusting value of the current ammonia spraying amount, wherein the adjusting value is a function of the concentration of the nitrogen oxide at the outlet;
determining the ammonia spraying value at the next moment according to the reference value of the ammonia spraying amount and the regulating value given by the inverse control system, and setting the acting time;
The ammonia injection quantity reference value which is currently involved in control is obtained by calculation according to the mean value of the nitrogen oxide concentration at the inlet of the current time period, the mean value of the nitrogen oxide concentration at the inlet of the previous time period and the mean value of the ammonia injection quantity concentration of the current time period; the regulating value is obtained according to the mean value of the concentration of the nitrogen oxide at the outlet in the current time period;
determining the ammonia injection quantity reference value of the current participation control by the following formula:
β1＝(αt+αt-1+αt-2)/(αt-3+αt-4+αt-5)×(βt+βt-1+βt-2)/3
Wherein, alpha t is inlet nitrogen oxide concentration data, and beta t is ammonia injection amount data; alpha t-1...αt-5 is the inlet nitrogen oxide concentration value from the t-1 time period to the t-5 time, beta t-1 is the ammonia injection amount data at the t-1 time, and beta t-2 is the ammonia injection amount data at the t-2 time.
Filtering the received nitrogen oxide concentration data includes:
comparing the nitrogen oxide concentration data at the inlet with the nitrogen oxide concentration data at the outlet and a preset threshold value;
screening out the inlet nitrogen oxide concentration data and the outlet nitrogen oxide concentration data which exceed the preset threshold value, obtaining residual data which are in the normal threshold value range after filtering, and taking the residual data as effective data.
The determining the value of the ammonia injection at the next moment according to the reference value of the ammonia injection amount and the regulating value given by the inverse control system comprises the following steps:
Setting a threshold value theta 0 of the emission of the nitrogen oxides at the outlet according to the requirements of the national environmental protection standard, and returning an adjustment quantity lambda (theta t-θ0) when the concentration theta t of the nitrogen oxides at the outlet exceeds theta 0 or is lower than theta 0;
Wherein, θ t is the outlet nitrogen oxide concentration data, λ is a variable adjustment factor, λ=f (θ t+θt-1+θt-2), the range is (0.1,0.8), θ t-1 is the outlet nitrogen oxide concentration data at time t-1, and θ t-2 is the outlet nitrogen oxide concentration data at time t-2;
According to the regulating value and the reference value, calculating a control parameter of the ammonia injection amount at the next moment:
Beta 2＝β1+λ(θt-θ0), and the value range of the action time t 0,t0 is set to be between (0.1 and 10) minutes, and the specific size is set according to the enterprise process.
NOx concentration data.
An optimized self-control system for industrial enterprise emission pollution, comprising:
the filtering module is used for filtering the received nitrogen oxide concentration data based on a preset data filtering rule;
The first control module is used for performing forward control on the effective data obtained after filtering and determining a reference value of the ammonia injection amount which is currently involved in control;
The second adjusting module is used for carrying out reverse control on the effective data obtained after filtering and determining an adjusting value of the ammonia spraying amount which is currently involved in control;
And the third action module is used for calculating the ammonia injection quantity participated in control at the next moment according to the current reference value and the regulating value, setting action time, and continuously updating the ammonia injection value according to the calculated reference value and the regulating value after the action time is up.
The filter module includes:
the comparison module is used for comparing the inlet nitrogen oxide concentration data, the nitrogen oxide concentration data at the outlet and a preset threshold value;
The filtering unit is used for screening out the inlet nitrogen oxide concentration data and the outlet nitrogen oxide concentration data which exceed the preset threshold value, obtaining residual data which are in the normal threshold value range after filtering, and taking the residual data as effective data.
The invention has the beneficial effects that:
According to the ammonia spraying automatic control method and system for exceeding the standard of the nitrogen oxides discharged by industrial enterprises, provided by the invention, the factors influencing the concentration of the nitrogen oxides at the outlet do not need to be researched in a reaction system, but the problems are solved from the data layer by jumping out of the system, so that the nitrogen oxides at the outlet are ensured not to exceed the standard, and a large amount of manpower and ammonia spraying dosage are saved.
The ammonia spraying automatic control method and system provided by the invention have novel scheme design thought, the adopted parameters and forward control and direction control designs are advanced, the nitrogen oxide of the outlet pollutant can be effectively controlled not to exceed the standard, and the regulation and control effect is far beyond manual regulation and control
The ammonia spraying automatic control method and system have wide application range, can be used for controlling nitrogen oxides, can also be used for controlling polluted gas such as sulfur dioxide and the like, and have strong portability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a flow chart of an ammonia injection self-control method for exceeding the standard of nitrogen oxides discharged by industrial enterprises in an embodiment of the invention;
FIG. 2 is a flow chart of a method for controlling chemical reactions based on ammonia injection in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs.
The invention provides an ammonia injection automatic control method for exceeding the standard of nitrogen oxides discharged by industrial enterprises,
The self-control method mainly comprises three parts of access, processing and control, wherein the control part comprises a forward control part and a reverse control part.
1. Access part
And directly accessing an enterprise data system, and transmitting the inlet nitrogen oxide concentration data, the ammonia injection amount data and the outlet nitrogen oxide concentration data in real time, wherein the data is second-level data.
2. Processing part
And filtering the received inlet nitrogen oxide concentration data alpha t, ammonia injection amount data beta t and outlet nitrogen oxide theta t data, deleting abnormal and non-logical data, and preventing data abnormality caused by sensor problems. (data filtering, i.e. deleting abnormal and abnormal data, please make up that of the nitrogen oxide concentration data α t, the ammonia injection amount data β t, and the nitrogen oxide θ t at the outlet, what data belongs to abnormal and abnormal data) here, abnormal data including negative concentration data and concentration data exceeding the order of magnitude, in actual operation, the abnormal and abnormal values rarely occur, if the calculation is performed in the DCS system, the filtering is not needed, the algorithm of the averaging module is provided in the system, and if the system is designed, the filtering is performed for the purpose of safety and accuracy.
3. Control part
Forward control: a reference value for ammonia injection is determined based on the inlet nox concentration variation.
The average value of the concentration of the nitrogen oxide at the inlet of the current time period/the average value of the nitrogen oxide at the inlet of the previous small time period is the average value of the ammonia injection amount of the current time period. Expressed by the formula:
β1＝(αt+αt-1+αt-2)/(αt-3+αt-4+αt-5)×(βt+βt-1+βt-2)/3 (1)
Reverse control: an adjustment value for ammonia injection is determined based on the change in concentration of the nitrogen oxides at the outlet.
According to the requirements of national environmental protection standards, a threshold value theta 0 of the export nitrogen oxide is set, the value theta 0 is set according to specific process conditions, and the total export can reach the standard.
When the outlet nox concentration θ t exceeds θ 0 or is lower than θ 0, an adjustment amount λ (θ t-θ0) is returned, where λ is a variable adjustment factor, i.e., λ=f (θ t+θt-1+θt-2), ranging between (0.1,0.8), θ t-1 is outlet nox concentration data at time t-1, and θ t-2 is outlet nox concentration data at time t-2.
Determining an ammonia injection value participating in control at the next moment according to the reference value and the regulating value, and setting the action time to be expressed as follows by a formula: beta 2＝β1+λ(θt-θ0) (2)
Β 2 updates every t 0.
And finally, transmitting beta 2 to a control center as the ammonia injection amount at the next moment to perform chemical reaction control.
Example 1:
As shown in fig. 1, the method specifically includes the steps of:
s1, filtering the received nitrogen oxide concentration data based on a preset data filtering rule;
s2, forward control is carried out on the effective data obtained after filtering, and an ammonia injection quantity reference value which participates in control at present is determined;
s3, reversely controlling the effective data obtained after filtering, and determining the current ammonia injection amount regulating value participating in control;
s4, determining an ammonia injection value at the next moment according to the reference value and the regulating value, setting the acting time, and continuously updating the ammonia injection value according to the calculated reference value and the regulating value after the acting time is up.
In step S1, filtering the received nitrogen oxide concentration data includes:
comparing the nitrogen oxide concentration data at the inlet with the nitrogen oxide concentration data at the outlet and a preset threshold value;
screening out the inlet nitrogen oxide concentration data and the outlet nitrogen oxide concentration data which exceed the preset threshold value, obtaining residual data which are in the normal threshold value range after filtering, and taking the residual data as effective data.
In step S2, the current ammonia injection quantity reference value participating in control is obtained by calculating according to the mean value of the inlet nitrogen oxide concentration in the current time period, the mean value of the inlet nitrogen oxide concentration in the previous time period and the mean value of the ammonia injection quantity concentration in the current time period.
The ammonia injection quantity reference value which is currently involved in control is determined by the following formula:
β1＝(αt+αt-1+αt-2)/(αt-3+αt-4+αt-5)×(βt+βt-1+βt-2)/3
Wherein, alpha t is inlet nitrogen oxide concentration data, and beta t is ammonia injection amount data; alpha t-1...αt-5 is the inlet nitrogen oxide concentration value from the t-1 time period to the t-5 time, beta t-1 is the ammonia injection amount data at the t-1 time, and beta t-2 is the ammonia injection amount data at the t-2 time.
In step S3, performing reverse control on the effective data obtained after filtering, where determining the current ammonia injection amount adjustment value involved in control includes:
Setting a threshold value theta 0 of the emission of the nitrogen oxides at the outlet according to the requirements of the national environmental protection standard, and returning to an adjusting value lambda (theta t-θ0) when the concentration theta t of the nitrogen oxides at the outlet exceeds theta 0 or is lower than theta 0;
wherein, θ t is the outlet nitrogen oxide concentration data, λ is a variable adjustment factor, λ=f (θ t+θt-1+θt-2), the range is (0.1,0.8), θ t-1 is the outlet nitrogen oxide concentration data at time t-1, and θ t-2 is the outlet nitrogen oxide concentration data at time t-2.
In step S4, according to the reference value and the adjustment value, determining the ammonia injection value at the next moment:
β 2＝β1+λ(θt-θ0) and the action time t 0,t0 is set to be within the range of (0.2, 10) minutes, and β 2 is updated every t 0.
Example 2:
Based on the same inventive concept, the invention also provides an optimized automatic control system for the emission pollution of industrial enterprises, which is characterized by comprising the following components:
the filtering module is used for filtering the received nitrogen oxide concentration data based on a preset data filtering rule;
The first control module is used for performing forward control on the effective data obtained after filtering and determining a reference value of the ammonia injection amount which is currently involved in control;
the second adjusting module is used for reversely controlling the effective data obtained after filtering and determining an adjusting value of the ammonia injection quantity which is currently participated in control; .
Wherein, the filtration module includes:
the comparison module is used for comparing the inlet nitrogen oxide concentration data, the nitrogen oxide concentration data at the outlet and a preset threshold value;
The filtering unit is used for screening out the inlet nitrogen oxide concentration data and the outlet nitrogen oxide concentration data which exceed the preset threshold value, obtaining residual data which are in the normal threshold value range after filtering, and taking the residual data as effective data.
Wherein the first control module comprises: the determining unit is used for determining the ammonia injection amount currently participating in control through the following formula:
β1＝(αt+αt-1+αt-2)/(αt-3+αt-4+αt-5)×(βt+βt-1+βt-2)/3
Wherein, alpha t is inlet nitrogen oxide concentration data, and beta t is ammonia injection amount data; alpha t-1...αt-5 is the inlet nitrogen oxide concentration value from the t-1 time period to the t-5 time, beta t-1 is the ammonia injection amount data at the t-1 time, and beta t-2 is the ammonia injection amount data at the t-2 time.
The second adjustment module includes:
The processing unit is used for setting a threshold value theta 0 of an outlet nitrogen oxide emission standard according to the requirements of national environmental protection standards, and returning an adjustment quantity lambda (theta t-θ0) when the concentration theta t of nitrogen oxides at the outlet exceeds theta 0 or is lower than theta 0;
wherein, θ t is the outlet nitrogen oxide concentration data, λ is a variable adjustment factor, λ=f (θ t+θt-1+θt-2), the range is (0.1,0.8), θ t-1 is the outlet nitrogen oxide concentration data at time t-1, and θ t-2 is the outlet nitrogen oxide concentration data at time t-2.
The third action module includes:
The time control unit calculates the control parameter of the ammonia injection amount at the next moment according to the reference value and the regulating value by adding the reference value and the regulating value:
β 2＝β1+λ(θt-θ0) and the action time t 0,t0 is set to be within the range of (0.2, 10) minutes, and β 2 is updated every t 0.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (3)
1. An optimized self-control method for industrial enterprise emission pollution, which is characterized by comprising the following steps:
Based on a pre-configured data filtering rule, filtering the received nitrogen oxide concentration data at the inlet, performing forward control on effective data obtained after filtering, and determining a reference value of the current participation in controlling the ammonia injection amount, wherein the reference value is a function of the inlet nitrogen oxide concentration;
Based on a pre-configured data filtering rule, filtering the received nitrogen oxide concentration data at the outlet, reversely controlling the effective data obtained after filtering, and determining an adjusting value of the current ammonia spraying amount, wherein the adjusting value is a function of the concentration of the nitrogen oxide at the outlet;
determining the ammonia spraying value at the next moment according to the reference value of the ammonia spraying amount and the regulating value given by the inverse control system, and setting the acting time;
The ammonia injection quantity reference value which is currently involved in control is obtained by calculation according to the mean value of the nitrogen oxide concentration at the inlet of the current time period, the mean value of the nitrogen oxide concentration at the inlet of the previous time period and the mean value of the ammonia injection quantity concentration of the current time period; the regulating value is obtained according to the mean value of the concentration of the nitrogen oxide at the outlet in the current time period;
determining the ammonia injection quantity reference value of the current participation control by the following formula:
β1＝(αt+αt-1+αt-2)/(αt-3+αt-4+αt-5)×(βt+βt-1+βt-2)/3
Wherein, alpha t is inlet nitrogen oxide concentration data, and beta t is ammonia injection amount data; alpha t-1...αt-5 is the inlet nitrogen oxide concentration value from the t-1 time period to the t-5 time, beta t-1 is the ammonia injection amount data at the t-1 time, and beta t-2 is the ammonia injection amount data at the t-2 time.
2. The method according to claim 1, characterized in that: filtering the received nitrogen oxide concentration data includes:
comparing the nitrogen oxide concentration data at the inlet with the nitrogen oxide concentration data at the outlet and a preset threshold value;
screening out the inlet nitrogen oxide concentration data and the outlet nitrogen oxide concentration data which exceed the preset threshold value, obtaining residual data which are in the normal threshold value range after filtering, and taking the residual data as effective data.
3. The method according to claim 1, characterized in that: the determining the value of the ammonia injection at the next moment according to the reference value of the ammonia injection amount and the regulating value given by the inverse control system comprises the following steps:
Setting a threshold value theta 0 of the emission of the nitrogen oxides at the outlet according to the requirements of the national environmental protection standard, and returning an adjustment quantity lambda (theta t-θ0) when the concentration theta t of the nitrogen oxides at the outlet exceeds theta 0 or is lower than theta 0;
Wherein, θ t is the outlet nitrogen oxide concentration data, λ is a variable adjustment factor, λ=f (θ t+θt-1+θt-2), the range is (0.1,0.8), θ t-1 is the outlet nitrogen oxide concentration data at time t-1, and θ t-2 is the outlet nitrogen oxide concentration data at time t-2;
According to the regulating value and the reference value, calculating a control parameter of the ammonia injection amount at the next moment:
Beta 2＝β1+λ(θt-θ0), and the value range of the action time t 0,t0 is set to be between (0.1 and 10) minutes, and the specific size is set according to the enterprise process.
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| JPH11347368A (en) * | 1998-06-10 | 1999-12-21 | Babcock Hitachi Kk | Method and apparatus for controlling ammonia injection in denitration apparatus |
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| US7435400B2 (en) * | 2006-02-07 | 2008-10-14 | Bert Zauderer | Optimizing post-combustion nitrogen oxide and sulfur dioxide reductions and improving combustion efficiency in coal fired boilers |
| US9192892B2 (en) * | 2014-01-16 | 2015-11-24 | Cummins Emission Solutions, Inc. | Selective dosing module control system |
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| JPH11347368A (en) * | 1998-06-10 | 1999-12-21 | Babcock Hitachi Kk | Method and apparatus for controlling ammonia injection in denitration apparatus |
| CN106582284A (en) * | 2016-12-14 | 2017-04-26 | 河南华润电力古城有限公司 | Automatic control method and system of thermal-power-unit SCR denitration ammonia spraying |
| CN110960983A (en) * | 2019-10-24 | 2020-04-07 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Grid method to optimize partition control method and denitrification ammonia injection subsystem obtained by partition |
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