CN-122018345-A - Blast control method, system, storage medium and program product of wet desulfurization system

CN122018345ACN 122018345 ACN122018345 ACN 122018345ACN-122018345-A

Abstract

The application provides a blast control method, a system, a storage medium and a program product of a wet desulfurization system, which relate to the technical field of wet desulfurization control, and the method comprises the steps of setting a plurality of oxidation state monitoring points in an absorption tower slurry pool of the wet desulfurization system, collecting slurry oxidation state parameters of each oxidation state monitoring point in real time, and obtaining operation condition parameters of the wet desulfurization system and fan control parameters of a magnetic suspension oxidation fan; in the operation process of the wet desulfurization system, fan control parameters, slurry oxidation state parameters and operation condition parameters are input into a prediction model, the prediction slurry state parameters output by the prediction model are obtained, the prediction air quantity is determined according to the prediction slurry state parameters and the operation condition parameters, the deviation feedback model is used for carrying out air quantity correction operation on the slurry oxidation state parameters to obtain corrected air quantity, target control air quantity is generated according to the prediction air quantity and the corrected air quantity, and the operation regulation and control operation is carried out on the magnetic suspension oxidation fan by using the target control air quantity.

Inventors

XIAO YIDONG
ZHANG NING
LI JINGCHAO
LIU XIANZHUO

Assignees

北京北科欧远科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1. A blast control method of a wet desulfurization system, comprising: Setting a plurality of oxidation state monitoring points in an absorption tower slurry pool of a wet desulfurization system to acquire slurry oxidation state parameters of each oxidation state monitoring point in real time, and acquiring operation condition parameters of the wet desulfurization system and fan control parameters of a magnetic suspension oxidation fan of the wet desulfurization system; In the operation process of the wet desulfurization system, the fan control parameter, the slurry oxidation state parameter and the operation condition parameter are input into a DTW-CNN-LSTM prediction model to obtain a predicted slurry state parameter which is output after the DTW-CNN-LSTM prediction model executes target air quantity prediction operation on the fan control parameter, the slurry oxidation state parameter and the operation condition parameter, and the predicted air quantity is determined according to the predicted slurry state parameter and the operation condition parameter; performing air volume correction operation on the slurry oxidation state parameters by using a DO-ORP deviation feedback model to obtain corrected air volume; Generating target control air quantity according to the predicted air quantity and the corrected air quantity, and executing operation regulation and control operation on the magnetic suspension oxidation fan by utilizing the target control air quantity.
2. The method according to claim 1, wherein the setting a plurality of oxidation state monitoring points in the absorption tower slurry pool of the wet desulfurization system to collect slurry oxidation state parameters of each oxidation state monitoring point in real time, and obtain operation condition parameters of the wet desulfurization system and fan control parameters of a magnetic suspension oxidation fan of the wet desulfurization system, specifically comprises: arranging a plurality of integrated measuring devices at different depth positions and different radial directions of the absorption tower slurry pool to obtain a plurality of oxidation state monitoring points, and acquiring the dissolved oxygen value, the oxidation-reduction potential value and the pH value of each oxidation state monitoring point in the plurality of oxidation state monitoring points in real time by utilizing the plurality of integrated measuring devices; Determining the total dissolved oxygen value of the absorption tower slurry pool according to the dissolved oxygen value of each oxidation state monitoring point, and determining the total oxidation-reduction potential value of the absorption tower slurry pool according to the oxidation-reduction potential value of each oxidation state monitoring point; Performing first deviation analysis on the dissolved oxygen value of each oxidation state monitoring point and the total dissolved oxygen value to obtain a first dissolved oxygen deviation value of each oxidation state monitoring point, and performing second deviation analysis on the oxidation-reduction potential value of each oxidation state monitoring point and the total oxidation-reduction potential value to obtain a first oxidation-reduction potential deviation value of each oxidation state monitoring point; taking the total dissolved oxygen value, the total oxidation-reduction potential value, the first dissolved oxygen deviation value, the first oxidation-reduction potential deviation value and the pH value as the slurry oxidation state parameters; Collecting the concentration of a sulfur dioxide inlet from a flue gas inlet of the absorption tower, collecting the concentration of a sulfur dioxide outlet from a flue gas outlet of the absorption tower, and taking the concentration of the sulfur dioxide inlet and the concentration of the sulfur dioxide outlet as the operation working condition parameters; And acquiring the current motor rotating speed and the current front guide vane opening of the magnetic suspension oxidation fan, and taking the current motor rotating speed and the current front guide vane opening as the fan control parameters.
3. The method according to claim 2, wherein during the operation of the wet desulfurization system, the fan control parameter, the slurry oxidation state parameter, and the operation condition parameter are input to a DTW-CNN-LSTM prediction model to obtain predicted slurry state parameters output by the DTW-CNN-LSTM prediction model after performing a target air volume prediction operation on the fan control parameter, the slurry oxidation state parameter, and the operation condition parameter, specifically including: Inputting the fan control parameter, the slurry oxidation state parameter and the operation condition parameter into the DTW-CNN-LSTM prediction model so that the DTW-CNN-LSTM prediction model executes the following target air volume prediction operation: The DTW-CNN-LSTM prediction model converts the fan control parameter, the slurry oxidation state parameter and the operation condition parameter into a three-dimensional feature matrix through an input layer; The DTW-CNN-LSTM prediction model performs time sequence alignment processing on the three-dimensional feature matrix through a DTW time sequence alignment module to obtain a time synchronization sequence; The DTW-CNN-LSTM prediction model performs associated feature extraction on the time synchronization sequence through a CNN local feature extraction module to obtain short-term local associated features; The DTW-CNN-LSTM prediction model extracts time sequence features of the short-term local association features through an LSTM long-term dependence capture module to obtain long-term accumulation trend features; And the DTW-CNN-LSTM prediction model performs feature mapping processing on the long-term accumulated trend features through a fully-connected output layer to obtain predicted slurry state parameters.
4. The method according to claim 2, wherein the performing an air volume correction operation on the slurry oxidation state parameter using a DO-ORP deviation feedback model to obtain a corrected air volume, specifically comprises: Performing a third bias analysis on the total dissolved oxygen value and the total oxidation-reduction potential value by using a DO-ORP bias feedback model, determining a second dissolved oxygen bias value between the total dissolved oxygen value and a preset dissolved oxygen threshold, and determining a second oxidation-reduction potential bias value between the total oxidation-reduction potential value and the preset oxidation-reduction potential threshold; determining a basic corrected air quantity according to the second dissolved oxygen deviation value and the second oxidation-reduction potential deviation value; determining a spatial distribution non-uniformity of slurry oxidation according to the first dissolved oxygen bias value and the first oxidation-reduction potential bias value; Comparing the spatial distribution non-uniformity with a preset non-uniformity threshold value in a distribution manner so as to determine compensation and correction air quantity when the spatial distribution non-uniformity is larger than the preset non-uniformity threshold value; and superposing the basic correction air quantity and the compensation correction air quantity to obtain the correction air quantity, wherein the output air quantity of the magnetic suspension oxidation fan needs to be increased if the correction air quantity is a positive value, and the output air quantity of the magnetic suspension oxidation fan needs to be reduced if the correction air quantity is a negative value.
5. The method according to claim 4, wherein the generating a target control air volume according to the predicted air volume and the corrected air volume, and performing an operation regulation and control operation on the magnetic suspension oxidation fan of the wet desulfurization system by using the target control air volume, specifically comprises: Performing air volume compensation processing on the predicted air volume and the corrected air volume to generate the target control air volume; Acquiring the current outlet air quantity and the current outlet pressure of the magnetic suspension oxidation fan; Determining a fan control strategy according to the target control air quantity, the current outlet air quantity and the current outlet pressure, wherein the fan control strategy comprises a front guide vane regulating strategy and a rotating speed regulating strategy; Performing air volume comparison on the target control air volume and the current outlet air volume and performing rotation speed comparison on the current motor rotation speed and a preset rotation speed threshold value, so as to execute the front guide vane adjustment strategy when the target control air volume is smaller than the current outlet air volume and the current motor rotation speed is smaller than the preset rotation speed threshold value; Comparing the opening of the current front guide vane with a preset limit opening to execute the rotating speed regulating strategy when the opening of the current front guide vane reaches the preset limit opening, or executing the rotating speed regulating strategy when the target control air quantity is larger than or equal to the current outlet air quantity; performing fourth deviation analysis on the current outlet air quantity and the target control air quantity to obtain deviation control air quantity; And performing deviation comparison on the deviation control air quantity and a preset deviation threshold value, so as to iteratively adjust the current front guide vane opening degree or the current motor rotating speed when the deviation control air quantity is larger than the preset deviation threshold value until the deviation control air quantity is smaller than or equal to the preset deviation threshold value.
6. The method of claim 5, wherein the performing the front vane adjustment strategy when the target control air volume is less than the current outlet air volume and the current motor speed is less than a preset speed threshold, specifically comprises: determining an air volume difference value between the target control air volume and the current outlet air volume; Determining a target front guide vane opening according to the air volume difference value and a preset front guide vane characteristic curve, wherein the front guide vane characteristic curve represents the corresponding relation between the front guide vane opening and the air volume change; determining the opening adjustment quantity of a front guide vane device of the magnetic suspension oxidation fan according to the opening of the target front guide vane and the opening of the current front guide vane; When the opening degree adjustment amount is larger than a preset single maximum adjustment angle, decomposing the opening degree adjustment amount into a plurality of adjustment steps, wherein the adjustment amplitude of each adjustment step in the plurality of adjustment steps is not larger than the preset single maximum adjustment angle; Controlling the front guide vane device to adjust the opening of the current front guide vane according to the plurality of adjusting steps so as to enable the airflow entering the magnetic suspension oxidation fan to generate a pre-rotation component with the same rotation direction as the impeller of the magnetic suspension oxidation fan; And in the front guide vane opening degree adjusting process, monitoring the vibration state and the surge state of the magnetic suspension oxidation fan in real time so as to stop adjusting the current front guide vane opening degree when the vibration value of the magnetic suspension oxidation fan is larger than a preset vibration threshold value or the surge margin of the magnetic suspension oxidation fan is smaller than a preset safety margin.
7. The method of claim 6, wherein the executing the rotational speed adjustment strategy when the current front vane opening reaches the preset limit opening or the target control air volume is greater than or equal to the current outlet air volume specifically comprises: Judging whether the current front guide vane opening reaches the preset limit opening or not, wherein the preset limit opening comprises a first opening limit value and a second opening limit value, the first opening limit value is a minimum opening value allowed by the front guide vane device, and the second opening limit value is a maximum opening value allowed by the front guide vane device; Starting a rotation speed regulation mode when the current front guide vane opening reaches the first opening limit value and the target control air quantity is smaller than the current outlet air quantity, or starting the rotation speed regulation mode when the current front guide vane opening reaches the second opening limit value and the target control air quantity is larger than or equal to the current outlet air quantity, or starting the rotation speed regulation mode when the target control air quantity is larger than the current outlet air quantity; in the rotating speed adjusting mode, determining a target rotating speed according to the target control air quantity, the current motor rotating speed and a preset fan performance curve; Generating a rotating speed adjusting instruction, and sending the rotating speed adjusting instruction to the magnetic suspension oxidation fan so as to adjust the current motor rotating speed to the target rotating speed; in the current motor rotating speed adjusting process, carrying out constraint control on the change rate of the current motor rotating speed so that the change rate is not larger than a preset change threshold value; And after the current motor rotating speed is determined to be regulated to the target rotating speed, carrying out pressure ratio comparison on the current outlet pressure and the limit pressure requirement of the absorption tower slurry tank, so that when the current outlet pressure is determined to be smaller than the limit pressure requirement, increasing and regulating the current motor rotating speed, and reducing and regulating the current front guide vane opening until the current outlet air volume reaches the target control air volume and the current outlet pressure is larger than or equal to the limit pressure requirement.
8. A blast control system, characterized in that it comprises one or more processors and a memory, said memory being coupled to said one or more processors, said memory being adapted to store computer program code, said computer program code comprising computer instructions, said one or more processors invoking said computer instructions to cause said blast control system to perform the method according to any of claims 1-7.
9. A computer readable storage medium comprising program instructions which, when run on a blast control system, cause the blast control system to perform the method according to any of claims 1-7.
10. A computer program product, characterized in that the computer program product, when run on a blast control system, causes the blast control system to perform the method according to any of claims 1-7.

Description

Blast control method, system, storage medium and program product of wet desulfurization system Technical Field The application relates to the technical field of wet desulfurization control, in particular to a blast control method, a system, a storage medium and a program product of a wet desulfurization system. Background With the increasingly strict environmental protection requirements and the continuous improvement of energy utilization efficiency standards, the wet desulfurization system is used as a core link of flue gas treatment of a thermal power plant, and the operation efficiency and the energy consumption control of the wet desulfurization system become key factors for influencing the economy and the environmental protection standard of the thermal power plant. Particularly, in the aspect of control of an oxidation fan, how to accurately regulate and control the oxidation air quantity so as to ensure that calcium sulfite is fully oxidized into gypsum, and meanwhile, energy waste caused by excessive air supply is avoided, so that the method has become an important subject for optimizing operation of a wet desulfurization system. In the related art, a wet desulfurization system generally adopts a Roots blower, a single-stage centrifugal blower or a multistage centrifugal high-speed blower as an oxidation blower, and supplies air to a slurry tank of an absorption tower in a main pipe branching manner. The operation control mainly depends on a single-point installed pH value and density measuring instrument, and the oxidation degree of gypsum is tested in a laboratory and a period of time is needed to report the result to guide the air quantity adjustment. When the test result shows that the oxidation of the calcium sulfite is insufficient, the operator manually increases the fan output, and when the gypsum quality is qualified, the operator tries to reduce the fan output again so as to save energy consumption. In order to ensure the oxidation effect under various working conditions, the control mode generally sets a larger air quantity margin, and the fan is in an excessive air supply state for a long time. However, when the control mode is adopted, because only the laboratory test results of single-point sampling and hysteresis are relied on, operators cannot accurately master the real-time oxidation requirement of the slurry tank of the absorption tower, in order to avoid insufficient oxidation affecting the gypsum quality, a conservation strategy can only be adopted to maintain higher air supply quantity, and further the air supply control effect of the oxidation fan of the wet desulfurization system in the related technology is poor. Disclosure of Invention The application provides a blast control method, a system, a storage medium and a program product of a wet desulfurization system, which are used for improving the air supply control effect of an oxidation fan of the wet desulfurization system. In a first aspect, the application provides a blast control method of a wet desulfurization system, which is applied to the blast control system, and the method comprises the steps of setting a plurality of oxidation state monitoring points in an absorption tower slurry pool of the wet desulfurization system, so as to acquire slurry oxidation state parameters of each oxidation state monitoring point in real time, and acquire operation condition parameters of the wet desulfurization system and fan control parameters of a magnetic suspension oxidation fan of the wet desulfurization system; in the operation process of the wet desulfurization system, fan control parameters, slurry oxidation state parameters and operation condition parameters are input into a DTW-CNN-LSTM prediction model to obtain predicted slurry state parameters which are output after the DTW-CNN-LSTM prediction model performs target air volume prediction operation on the fan control parameters, the slurry oxidation state parameters and the operation condition parameters, the predicted air volume is determined according to the predicted slurry state parameters and the operation condition parameters, an air volume correction operation is performed on the slurry oxidation state parameters by using a DO-ORP deviation feedback model to obtain corrected air volume, target control air volume is generated according to the predicted air volume and the corrected air volume, and operation regulation and control operation is performed on the magnetic suspension oxidation fan by using the target control air volume. By adopting the technical scheme, a spatial distributed monitoring network can be formed at a plurality of oxidation state monitoring points arranged in the absorption tower slurry pool, the slurry oxidation state parameters collected in real time by the monitoring points can comprehensively reflect oxidation state differences at different positions in the slurry pool, the synchronously obtained operation condition parameters can represen