Precise wet flue gas desulfurization control method and system

Abstract

This invention relates to the field of desulfurization detection technology, specifically to a precise wet flue gas desulfurization control method and system. The method first obtains desulfurization performance indicators during the flue gas recirculation period; based on the data distribution of environmental factors during the flue gas recirculation period and the correlation between changes in environmental factor data and sulfur oxide concentration, it obtains environmental impact indicators for the flue gas recirculation period; based on the desulfurization performance indicators and environmental impact indicators, it obtains a delay power adjustment factor for the flue gas recirculation period; and based on the delay power adjustment factor, it performs power control of the oxidation fan in wet flue gas desulfurization. This invention improves the power control effect of the oxidation fan in the wet flue gas desulfurization process by fully considering the impact of environmental factors and the power requirements of the oxidation fan due to the desulfurization effect, thus ensuring high efficiency in desulfurization.

Description

Technical Field

[0001] This invention relates to the field of desulfurization detection technology, specifically to a precise wet flue gas desulfurization control method and system. Background Technology

[0002] Precision wet flue gas desulfurization (FGD) technology, as an effective means of reducing air pollutant emissions from coal-fired power plants, has been widely applied in the field of industrial environmental protection. Precision wet FGD technology mainly achieves emission reduction and environmental protection by chemically or physically absorbing or transforming sulfur oxides in flue gas. In the process of precision wet FGD, the oxidation fan plays a crucial role; effectively controlling the air intake of the oxidation fan is of great significance for improving desulfurization efficiency, reducing energy consumption, and ensuring stable system operation.

[0003] Existing technology compares the intake air volume of the oxidation blower with the system setpoint, thereby increasing the blower's power when the intake air volume is too low to ensure desulfurization efficiency. However, when controlling the power of the oxidation blower in wet flue gas desulfurization, environmental factors and desulfurization efficiency lead to different power requirements for the oxidation blower, resulting in poor power control and difficulty in ensuring high efficiency in desulfurization. Summary of the Invention

[0004] To address the technical problem that existing technologies for controlling the power of oxidation fans in wet flue gas desulfurization (FGD) processes suffer from inconsistent power requirements due to environmental factors and varying desulfurization effects, resulting in poor power control and difficulty in ensuring high desulfurization efficiency, this invention aims to provide a precise wet FGD control method and system. The specific technical solution adopted is as follows:

[0005] A precise wet flue gas desulfurization control method, the method comprising:

[0006] During the wet flue gas desulfurization process, data on sulfur oxide concentration, sulfide reaction ion concentration, and environmental factors were acquired at all sampling times during the flue gas recirculation period.

[0007] During the flue gas recirculation period, an index of the dramatic change in the concentration of sulfide reaction ions is obtained based on the degree of dramatic change in the concentration of sulfide reaction ions at continuous sampling times; and an index of desulfurization effect during the flue gas recirculation period is obtained based on the similarity between the changes in the concentration of sulfur oxides and the concentration of sulfide reaction ions, the data distribution of the concentration of sulfur oxides, and the index of dramatic change.

[0008] Based on the data distribution of environmental factors during the flue gas recirculation period and the degree of correlation between changes in environmental factors and sulfur oxide concentration, environmental impact indicators for the flue gas recirculation period are obtained.

[0009] Based on the desulfurization effect index and the environmental impact index, the delay power adjustment factor for the flue gas circulation period is obtained; based on the delay power adjustment factor, the power control of the oxidation fan in wet flue gas desulfurization is performed.

[0010] Furthermore, the method for obtaining the drastic change indicator includes:

[0011] According to the magnitude of the sampling time, the concentrations of all the sulfidation reaction ions are sorted, and the difference value of each sulfidation reaction ion concentration is calculated.

[0012] By combining the differences in the concentrations of all sulfide reaction ions, the variation factor of sulfide reaction ions is obtained.

[0013] Based on the degree of dispersion in the concentration distribution of sulfide reaction ions, the factor of drastic change in sulfide reaction ions is obtained;

[0014] The drastic change index of the sulfidation reaction ion concentration is obtained based on the drastic change factor and the differential change factor; both the drastic change factor and the differential change factor are positively correlated with the drastic change index.

[0015] Furthermore, the method for obtaining the desulfurization effect index includes:

[0016] In terms of timing, based on the mean square error of the sulfur oxide concentration and the sulfide reaction ion concentration during the flue gas circulation period, a similarity factor between the changes in the sulfur oxide concentration and the sulfide reaction ion concentration is obtained;

[0017] Based on the deviation between the sulfur oxide concentration and the preset standard value, the deviation factor of the sulfur oxide concentration is obtained;

[0018] By integrating the change similarity factor, the deviation from the standard factor, and the drastic change index, the desulfurization effect index during the flue gas recirculation period is obtained; the change similarity factor and the desulfurization effect index are positively correlated; the deviation from the standard factor and the drastic change index are both negatively correlated with the desulfurization effect index.

[0019] Furthermore, the environmental factor data are: ambient temperature and ambient humidity.

[0020] Furthermore, the method for obtaining the environmental impact indicators includes:

[0021] During the flue gas circulation period, an environmental impact consistency factor is obtained based on the degree of difference in the fluctuation characteristics of the ambient temperature and ambient humidity.

[0022] Based on the correlation between environmental factor data and the temporal changes in sulfur oxide concentration, an influence factor is obtained.

[0023] Based on the environmental impact consistency factor and the impact degree factor, environmental impact indicators for the flue gas circulation period are obtained.

[0024] Furthermore, the method for obtaining the environmental impact consistency factor includes:

[0025] The absolute value of the difference between the fluctuation characteristics of ambient temperature and the fluctuation characteristics of ambient humidity is calculated to obtain the environmental impact consistency factor.

[0026] Furthermore, the method for obtaining the degree of influence factor includes:

[0027] In terms of time sequence, the temperature influence factor is obtained based on the correlation coefficient between the ambient temperature and the sulfur oxide concentration during the flue gas circulation period;

[0028] The humidity influence factor is obtained based on the correlation coefficient between the ambient humidity and the sulfur oxide concentration during the flue gas circulation period;

[0029] By integrating the influence factors of temperature and humidity, the degree of influence factor is obtained.

[0030] Furthermore, the fluctuation characteristic of the ambient temperature is the variance of the ambient temperature.

[0031] Furthermore, the method for power control of the oxidation blower in the wet flue gas desulfurization process includes:

[0032] Based on the delay power adjustment factor during the flue gas recirculation period and the power of the oxidation fan, the predicted delay power of the oxidation fan during the flue gas recirculation period is obtained.

[0033] The oxidation fan in the wet flue gas desulfurization process is controlled based on the predicted delay power of the oxidation fan.

[0034] This invention proposes a precision wet flue gas desulfurization control system, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements any of the steps of the precision wet flue gas desulfurization control method described above.

[0035] The present invention has the following beneficial effects:

[0036] This invention first analyzes the desulfurization effect of flue gas recirculation. Considering that the concentration of sulfide reaction ions tends to be stable in a well-performing desulfurization system during each flue gas recirculation, drastic fluctuations in the concentration of the desulfurizing agent indicate abnormalities in the chemical reaction within the reaction tank, affecting the desulfurization effect. Therefore, an index of drastic changes in the concentration of sulfide reaction ions is first obtained; such drastic changes indicate a higher likelihood of the desulfurizing agent being in an abnormal state, and a lower likelihood of poor desulfurization performance. Considering that sulfur oxides in the flue gas are absorbed by the desulfurizing agent and converted into sulfates, a lower correlation between the concentration of sulfur oxides and the concentration of sulfide reaction ions indicates that the concentration of sulfide reaction ions is insufficient for desulfurization, suggesting that changes in the concentration of sulfide reaction ions may be influenced by other factors, indicating a poorer desulfurization effect. Furthermore, considering that a lower concentration of sulfur oxides in the flue gas compared to the national standard indicates a lower sulfur oxide content and a better desulfurization effect, a desulfurization effect index for the flue gas recirculation period is finally obtained; a larger value indicates a better desulfurization effect during the recirculation period.

[0037] To analyze the impact of the environment on desulfurization efficiency, considering that the desulfurizing agent reacts chemically with sulfur oxides during the flue gas recirculation period to carry out desulfurization, and that the environment affects the rate of the desulfurization reaction, environmental impact indicators for the flue gas recirculation period are obtained, taking into account the combined effects of environmental factors and their impact on the desulfurization reaction. These indicators reflect the impact of the environment on desulfurization efficiency. By fully considering the impact of environmental factors and the power requirements of the oxidation fan resulting from the desulfurization effect, the power control effect of the oxidation fan in the wet flue gas desulfurization process is improved to ensure high desulfurization efficiency. Attached Figure Description

[0038] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A flowchart of a precise wet flue gas desulfurization control method provided in one embodiment of the present invention;

[0040] Figure 2 This is a structural diagram of a precision wet flue gas desulfurization control system provided in one embodiment of the present invention;

[0041] Figure 3 A flowchart of a rapidly changing index provided in one embodiment of the present invention;

[0042] Figure 4A flowchart illustrating a desulfurization performance index is provided in one embodiment of the present invention;

[0043] Figure 5 This is a flowchart of an environmental impact indicator provided in one embodiment of the present invention. Detailed Implementation

[0044] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of a precise wet flue gas desulfurization control method and system proposed according to the present invention. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0046] The following description, in conjunction with the accompanying drawings, details the specific scheme of the precise wet flue gas desulfurization control method and system provided by the present invention.

[0047] This invention provides a precise wet flue gas desulfurization control method and system. Please refer to [link / reference]. Figure 1 The diagram illustrates a flowchart of a precise wet flue gas desulfurization control method according to an embodiment of the present invention, which includes the following steps:

[0048] Step S1: During the wet flue gas desulfurization process, the concentrations of sulfur oxides, sulfide reaction ions, and environmental factors are obtained at all sampling times during the flue gas circulation period.

[0049] The main objective of this invention is to rationally control the power of the oxidation blower to ensure the high efficiency of oxidation in the wet flue gas desulfurization process. Considering that during flue gas desulfurization, when the desulfurization effect is poor or the environment cannot improve desulfurization efficiency, it is necessary to increase the power of the oxidation blower to generate a sufficient airflow and ensure high desulfurization efficiency. To analyze the desulfurization effect and environmental impact during different flue gas recirculation periods, data collection is required.

[0050] In the process of wet flue gas desulfurization, flue gas enters the desulfurization tower and is circulated multiple times to ensure that the final emission of flue gas meets the emission standards. During each flue gas circulation, the flue gas comes into contact with the desulfurizing agent in the tower, and the sulfur oxides in the flue gas are absorbed by the desulfurizing agent and converted into sulfates.

[0051] In one embodiment of this invention, wet flue gas desulfurization primarily removes sulfur dioxide from the flue gas. The sulfur dioxide concentration is used as the sulfur oxide concentration. In this invention, a calcium-containing alkaline solution is used as the sulfiding agent, and sulfur dioxide combines with calcium ions to convert into sulfate. The calcium ion concentration is used as the sulfidation reaction ion concentration. Environmental factor data in this invention include ambient temperature and ambient humidity. Specifically, the monitoring system acquires ambient temperature and humidity through temperature and humidity sensors installed on the desulfurization tower. From the monitoring system, the sulfur oxide concentration and sulfidation reaction ion concentration are obtained. The time interval corresponding to each flue gas cycle is defined as the flue gas cycle period. Sampling is performed at a preset frequency to obtain the sulfur oxide concentration, sulfidation reaction ion concentration, ambient temperature, and ambient humidity at all sampling times during the flue gas cycle period. In other embodiments of this invention, a magnesium-containing alkaline solution, such as magnesium hydroxide solution, is used as the sulfiding agent. Sulfur dioxide combines with magnesium ions to convert into sulfate, and the magnesium ion concentration is used as the sulfidation reaction ion concentration.

[0052] It should be noted that in one embodiment of the present invention, sampling is performed at a preset frequency, with each sampling session considered as a sampling moment. The preset frequency is 0.01 seconds. It should also be noted that, for ease of calculation, all index data involved in the calculation in this embodiment of the present invention undergoes data preprocessing to eliminate the influence of dimensions. The specific methods for eliminating the influence of dimensions are well-known to those skilled in the art and are not limited here.

[0053] Step S2: During the flue gas recirculation period, based on the degree of change in the concentration of sulfide reaction ions at continuous sampling times, obtain the index of the dramatic change in the concentration of sulfide reaction ions; based on the similarity between the changes in the concentration of sulfur oxides and the concentration of sulfide reaction ions during the flue gas recirculation period, the data distribution of the concentration of sulfur oxides, and the index of dramatic change, obtain the desulfurization effect index during the flue gas recirculation period.

[0054] First, it's necessary to analyze the desulfurization effect of flue gas recirculation. Considering that the concentration of sulfide reaction ions tends to be stable in a well-performing desulfurization system during each flue gas recirculation, drastic fluctuations in the desulfurizing agent concentration indicate abnormalities in the chemical reaction within the reaction tank, affecting the desulfurization effect. Therefore, we first need to obtain an indicator of drastic changes in sulfide reaction ion concentration; such drastic changes suggest the desulfurizing agent is more likely to be in an abnormal state, and the desulfurization effect is more likely to be poor. Considering that sulfur oxides in the flue gas are absorbed by the desulfurizing agent and converted into sulfates, the lower the similarity between the changes in sulfur oxide concentration and sulfide reaction ion concentration, the less the sulfide reaction ion concentration can provide sufficient assistance for desulfurization. The change in sulfide reaction ion concentration may be influenced by other factors, indicating a poorer desulfurization effect. Considering that the lower the sulfur oxide concentration in the flue gas compared to the national standard, the lower the sulfur oxide content in the flue gas, indicating a better desulfurization effect, we finally obtain an indicator of the desulfurization effect during the flue gas recirculation period; a larger value indicates a better desulfurization effect during that period.

[0055] Please see Figure 3 The document illustrates a flowchart of a drastic change index provided in one embodiment of the present invention. Preferably, in one embodiment of the present invention, since the concentration of sulfide reaction ions tends to change steadily in a desulfurization system with good desulfurization effect, the more stable the change in the concentration of sulfide reaction ions, the better the desulfurization effect. The drastic change index measures the degree of fluctuation in the concentration of sulfide reaction ions. The method for obtaining the drastic change index includes:

[0056] Step S201: Sort all sulfide reaction ion concentrations according to the sampling time and calculate the difference value of each sulfide reaction ion concentration.

[0057] The difference value reflects the degree of difference in the concentration of sulfide reaction ions over time.

[0058] In one embodiment of the present invention, the concentrations of all sulfide reaction ions can be sorted in ascending order of sampling time. In other embodiments of the present invention, the concentrations of all sulfide reaction ions can also be sorted in descending order of sampling time.

[0059] Step S202: Merge the difference values ​​of all sulfide reaction ion concentrations to obtain the variation factor of sulfide reaction ions.

[0060] The variation factor reflects the overall degree of difference in the concentration of sulfide reaction ions. The smaller the value, the more stable the concentration of sulfide reaction ions is over time.

[0061] In one embodiment of the present invention, the mean of the absolute values ​​of the differences in the concentrations of all sulfide reaction ions is calculated to obtain the variation difference factor of the sulfide reaction ions. In other embodiments of the present invention, the cumulative value of the absolute values ​​of the differences in the concentrations of all sulfide reaction ions is calculated to obtain the variation difference factor of the sulfide reaction ions.

[0062] Step S203: Based on the degree of dispersion in the concentration of sulfide reaction ions, obtain the factor of drastic change in sulfide reaction ions.

[0063] The drastic change factor of sulfide reaction ions reflects the degree of drastic change in the concentration of sulfide reaction ions; the larger the value, the more drastic the change.

[0064] In one embodiment of the present invention, the absolute value of the difference between the concentrations of every two sulfide reaction ions is calculated, and the absolute value of the largest difference is used as the drastic change factor of the sulfide reaction ions. The absolute value of the largest difference can reflect the degree of distribution dispersion. The larger the value, the more dispersed the distribution, and the more drastic the change in the concentration of sulfide reaction ions.

[0065] Step S204: Obtain the index of drastic change in sulfide reaction ion concentration based on the drastic change factor and the differential change factor; both the drastic change factor and the differential change factor are positively correlated with the drastic change index.

[0066] The drastic change index comprehensively reflects the degree of drastic change. The larger the value, the more drastic the change, and the more likely there are abnormal situations that may affect the desulfurization effect.

[0067] In one embodiment of the present invention, the product of the drastic change factor and the differential change factor is calculated to obtain an index of the drastic change in the concentration of sulfide reaction ions. In other embodiments of the present invention, the sum of the drastic change factor and the differential change factor is calculated to obtain an index of the drastic change in the concentration of sulfide reaction ions.

[0068] Please see Figure 4 The document illustrates a flowchart of a desulfurization effect index provided in one embodiment of the present invention. Preferably, in one embodiment of the present invention, the method for obtaining the desulfurization effect index to measure the desulfurization effect during the flue gas recirculation period includes:

[0069] Step S211: In terms of time sequence, based on the mean square error of sulfur oxide concentration and sulfide reaction ion concentration during flue gas circulation period, obtain the similarity factor between the changes in sulfur oxide concentration and sulfide reaction ion concentration.

[0070] The larger the similarity factor, the more similar the changes between the sulfur oxide concentration and the sulfide reaction ion concentration, indicating that the sulfide reaction ion concentration can provide sufficient assistance for desulfurization, and thus the better the desulfurization effect.

[0071] In one embodiment of the present invention, during the flue gas recirculation period, the sulfur oxide concentration is statistically analyzed sequentially at all sampling times to obtain time-series data of sulfur oxide concentration; the sulfide reaction ion concentration is also statistically analyzed sequentially at all sampling times to obtain time-series data of sulfide reaction ion concentration. The mean square error of the time-series data of sulfur oxide concentration and sulfide reaction ion concentration is calculated, and a negative correlation mapping is performed on the mean square error to obtain a similarity factor between the changes in sulfur oxide concentration and sulfide reaction ion concentration. The degree of similarity of changes is reflected by the negative correlation mapping of the mean square error. It should be noted that the mean square error is a prior art well known to those skilled in the art and will not be described in detail here. In one embodiment of the present invention, the method of negative correlation mapping is as follows: the negative number of the mean square error is used as the power of an exponential function with the natural constant as the base to obtain the negative correlation mapping result.

[0072] Step S212: Obtain the deviation factor of sulfur oxide concentration from the preset standard value based on the deviation between sulfur oxide concentration and the standard value.

[0073] The lower the deviation from the standard factor, the lower the sulfur oxide concentration compared to the national standard, indicating a lower sulfur oxide content in the flue gas and a better desulfurization effect.

[0074] The preset standard value reflects the national standard. In one embodiment of the present invention, the national standard emission concentration of sulfur oxides is used as the preset standard value. In another embodiment of the present invention, the difference between the sulfur oxide concentration and the preset standard value is calculated, and the difference is normalized to obtain the deviation factor of the sulfur oxide concentration from the standard. It should be noted that, in this embodiment of the present invention, linear normalization can be used to normalize the difference, which will not be elaborated here.

[0075] Step S213: Integrate the similarity factor, deviation from the standard factor, and drastic change index to obtain the desulfurization effect index during the flue gas recirculation period; the similarity factor and the desulfurization effect index are positively correlated; the deviation from the standard factor and the drastic change index are both negatively correlated with the desulfurization effect index.

[0076] The desulfurization effect index was obtained by taking into full account the impact of abnormal conditions on the desulfurization effect, the degree to which the sulfur oxide concentration is lower than the national standard, and the similarity between the changes in sulfur oxide concentration and sulfidation reaction ion concentration. The larger the desulfurization effect index, the better the desulfurization effect.

[0077] In one embodiment of the present invention, the product of the deviation from the standard factor and the drastic change index is calculated, the ratio of the change similarity factor to the product is calculated, and data fusion is performed to obtain the desulfurization effect index during the flue gas recirculation period. In other embodiments of the present invention, the sum of the deviation from the standard factor and the drastic change index can be calculated, the ratio of the change similarity factor to the sum can be calculated, and data fusion can be performed to obtain the desulfurization effect index during the flue gas recirculation period.

[0078] Step S3: Based on the data distribution of environmental factors during the flue gas recirculation period and the degree of correlation between changes in environmental factors and sulfur oxide concentration, obtain the environmental impact indicators for the flue gas recirculation period.

[0079] To analyze the impact of the environment on desulfurization efficiency, considering that the desulfurizing agent reacts chemically with sulfur oxides during the flue gas recirculation period to carry out desulfurization, and that the environment affects the rate of the desulfurization reaction, environmental impact indicators for the flue gas recirculation period are obtained, taking into account the combined effects of environmental factors and the impact of the environment on the desulfurization reaction. These environmental impact indicators reflect the impact of the environment on desulfurization efficiency.

[0080] Preferably, considering that the ambient temperature and humidity are closely related to the reaction rate during the precise wet desulfurization process, in one embodiment of the present invention, the environmental factor data are: ambient temperature and ambient humidity.

[0081] Please see Figure 5 The diagram illustrates a flowchart of an environmental impact indicator provided in one embodiment of the present invention. Preferably, in one embodiment of the present invention, the method for obtaining the environmental impact indicator includes:

[0082] Step S301: During the flue gas recirculation period, obtain the environmental impact consistency factor based on the degree of difference in the fluctuation characteristics of ambient temperature and ambient humidity.

[0083] The environmental impact consistency factor reflects the consistency of fluctuations in environmental temperature and humidity data. The larger the value, the more consistent the fluctuations of environmental impact factors.

[0084] In one embodiment of the present invention, the absolute value of the difference between the fluctuation characteristics of ambient temperature and the fluctuation characteristics of ambient humidity is calculated to obtain the environmental impact consistency factor. In another embodiment of the present invention, the fluctuation characteristics of ambient temperature are the variance of ambient temperature, and the fluctuation characteristics of ambient humidity are the variance of ambient humidity. In other embodiments of the present invention, the fluctuation characteristics of ambient temperature are the standard deviation of ambient temperature, and the fluctuation characteristics of ambient humidity are the standard deviation of ambient humidity.

[0085] Step S302: Obtain the influence factor based on the correlation between environmental factor data and the temporal changes in sulfur oxide concentration.

[0086] Considering that the environment affects the oxidation reaction, the stronger the negative correlation between changes in environmental factor data and changes in sulfur oxide concentration, the more the environmental factor promotes the desulfurization reaction. The larger the influence factor, the more the environmental factor promotes the desulfurization reaction.

[0087] Preferably, since ambient temperature and humidity can affect the desulfurization reaction, within a certain range, increasing temperature and humidity will promote the desulfurization reaction, accelerate the desulfurization reaction rate, and cause the concentration of sulfur oxides in the flue gas to show a decreasing trend. The closer the ambient temperature and sulfur oxide concentration are to a negative correlation, and the closer the ambient humidity and sulfur oxide concentration are to a negative correlation, the more the environmental factors promote the desulfurization reaction. In one embodiment of the present invention, the method for obtaining the degree of influence factor includes: in terms of time sequence, obtaining a temperature influence factor based on the correlation coefficient between ambient temperature and sulfur oxide concentration during the flue gas circulation period; obtaining a humidity influence factor based on the correlation coefficient between ambient humidity and sulfur oxide concentration during the flue gas circulation period; and combining the temperature influence factor and the humidity influence factor to obtain the degree of influence factor.

[0088] Specifically, regarding the above steps, during the flue gas circulation period, the sulfur oxide concentration is statistically analyzed sequentially at all sampling times to obtain sulfur oxide concentration time-series data; the ambient humidity is statistically analyzed sequentially at all sampling times to obtain ambient humidity time-series data; the ambient temperature is statistically analyzed sequentially at all sampling times to obtain ambient temperature time-series data; the correlation coefficient between the ambient temperature time-series data and the sulfur oxide concentration time-series data is calculated to obtain the temperature influence factor; the correlation coefficient between the ambient humidity time-series data and the sulfur oxide concentration time-series data is calculated to obtain the humidity influence factor; the sum of the temperature influence factor and the humidity influence factor is calculated, and a negative correlation mapping is performed on the sum to obtain the influence degree factor. It should be noted that the correlation coefficient is a well-known technique among those skilled in the art and will not be elaborated upon here. The correlation coefficient reflects the degree of correlation of changes. In one embodiment of the present invention, the opposite of the sum is used as the power of an exponential function with the natural constant as the base to obtain the negative correlation mapping result. It should be noted that in other embodiments of the present invention, other negative correlation mapping methods such as the opposite number or reciprocal can also be selected, which are all well-known techniques among those skilled in the art and will not be elaborated upon or limited here.

[0089] In other embodiments of the present invention, considering that the desulfurization reaction is mainly affected by ambient temperature, the method for obtaining the influence degree factor includes: considering that the desulfurization reaction is mainly affected by ambient temperature, the correlation coefficient between the time series data of ambient temperature and the time series data of sulfur oxide concentration can also be calculated to obtain the temperature influence factor; the temperature influence factor is negatively correlated and mapped to obtain the influence degree factor.

[0090] Step S303: Obtain environmental impact indicators for the flue gas recirculation period based on the environmental impact consistency factor and the impact degree factor.

[0091] Considering the strong consistency in the fluctuations of ambient temperature and humidity data, and the greater the degree to which the environment promotes desulfurization, environmental impact indicators are obtained during the flue gas recirculation period. A higher environmental impact indicator indicates a greater promotion of the desulfurization reaction by the environment.

[0092] In one embodiment of the present invention, the environmental impact index for the flue gas recirculation period is obtained by calculating the product of the environmental impact consistency factor and the impact degree factor. In other embodiments of the present invention, the environmental impact index for the flue gas recirculation period is obtained by calculating the sum of the environmental impact consistency factor and the impact degree factor.

[0093] Step S4: Based on the desulfurization effect indicators and environmental impact indicators, obtain the delay power adjustment factor for the flue gas circulation period; based on the delay power adjustment factor, control the power of the oxidation fan in wet flue gas desulfurization.

[0094] Considering that the oxidation blower is used to provide the oxygen required for the oxidation reaction in the wet flue gas desulfurization process, by adjusting the power of the oxidation blower, more oxygen can be provided when the desulfurization effect is poor or when the environment has a low promoting effect on the desulfurization effect, thus ensuring the high efficiency of desulfurization.

[0095] Preferably, in one embodiment of the present invention, in order to reasonably adjust the power of the oxidation blower, a delayed power adjustment factor is constructed by analyzing the desulfurization effect during the flue gas circulation period and the environmental promotion effect on the desulfurization effect. The delayed power adjustment factor is larger when the desulfurization effect is worse and the environmental promotion effect on the desulfurization effect is lower. The delayed power adjustment factor reflects the degree to which the desulfurization rate needs to be increased. The method for obtaining the delayed power adjustment factor includes:

[0096] Based on the desulfurization effect indicators and environmental impact indicators, the delay power adjustment factor for the flue gas recirculation period is obtained; both the desulfurization effect indicators and environmental impact indicators are negatively correlated with the delay power adjustment factor.

[0097] In one embodiment of the present invention, the product of the desulfurization effect index and the environmental impact index is calculated. The negative of the product is used as the power of an exponential function with the natural constant as the base to obtain a negative correlation mapping result. The sum of 1 and the negative correlation mapping result is calculated to obtain the delay power adjustment factor for the flue gas recirculation period. In other embodiments of the present invention, the sum of the desulfurization effect index and the environmental impact index is calculated. The reciprocal of the sum is used as the negative correlation mapping result. The sum of 1 and the negative correlation mapping result is calculated to obtain the delay power adjustment factor for the flue gas recirculation period.

[0098] Preferably, in one embodiment of the present invention, the method for power control of the oxidation blower in wet flue gas desulfurization includes:

[0099] Based on the delay power adjustment factor during the flue gas recirculation period and the power of the oxidation fan, the predicted delay power of the oxidation fan during the flue gas recirculation period is obtained.

[0100] The oxidation fan in the wet flue gas desulfurization process is controlled based on the predicted delay power of the oxidation fan.

[0101] In one embodiment of the present invention, the delayed power adjustment factor of the flue gas recirculation period and the power of the oxidation fan are calculated to obtain the predicted delayed power of the oxidation fan during the flue gas recirculation period. During wet flue gas desulfurization, after the current flue gas recirculation period ends, the predicted delayed power of the oxidation fan for that period can be obtained. This predicted delayed power is used as the power of the oxidation fan for the next flue gas recirculation period. By analyzing the desulfurization effect during the current flue gas recirculation period and the environmental factors contributing to the desulfurization effect, the control effect for the next flue gas recirculation period can be improved, ensuring the high efficiency of flue gas desulfurization and ultimately improving the system's stability and energy utilization efficiency.

[0102] In summary, this invention provides a precise wet flue gas desulfurization control method and system. First, based on the similarity of changes in sulfur oxide concentration and sulfide reaction ion concentration during the flue gas recirculation period, the data distribution of sulfur oxide concentration, and indicators of drastic changes, desulfurization performance indicators for the flue gas recirculation period are obtained. Then, based on the data distribution of environmental factor data during the flue gas recirculation period and the correlation between environmental factor data and sulfur oxide concentration, environmental impact indicators for the flue gas recirculation period are obtained. Finally, based on the desulfurization performance indicators and environmental impact indicators, a delay power adjustment factor for the flue gas recirculation period is obtained. Based on the delay power adjustment factor, the power control of the oxidation fan in the wet flue gas desulfurization process is performed. This invention improves the power control effect of the oxidation fan in the wet flue gas desulfurization process by fully considering the impact of environmental factors and the power requirements of the oxidation fan due to the desulfurization effect, ensuring high efficiency in desulfurization.

[0103] This invention also proposes a precise wet flue gas desulfurization control system; please refer to [link / reference]. Figure 2 The diagram shows a structural diagram of a precision wet flue gas desulfurization control system provided by an embodiment of the present invention. The system includes: a data acquisition module 101, a desulfurization effect analysis module 102, an environmental impact analysis module 103, and a control module 104.

[0104] The data acquisition module 101 is used to acquire sulfur oxide concentration, sulfide reaction ion concentration and environmental factor data at all sampling times during the flue gas circulation period during the wet flue gas desulfurization process.

[0105] The desulfurization effect analysis module 102 is used to obtain the index of the dramatic change in the concentration of sulfide reaction ions based on the degree of dramatic change in the concentration of sulfide reaction ions at continuous sampling time during the flue gas circulation period; and to obtain the desulfurization effect index during the flue gas circulation period based on the similarity between the changes in the concentration of sulfur oxides and the concentration of sulfide reaction ions, the data distribution of the concentration of sulfur oxides, and the index of dramatic change.

[0106] The environmental impact analysis module 103 is used to obtain environmental impact indicators for the flue gas circulation period based on the data distribution of environmental factor data during the flue gas circulation period and the degree of correlation between changes in environmental factor data and sulfur oxide concentration.

[0107] The control module 104 is used to obtain the delay power adjustment factor during the flue gas circulation period based on the desulfurization effect index and the environmental impact index; and to control the power of the oxidation fan in wet flue gas desulfurization based on the delay power adjustment factor.

[0108] It should be noted that the system provided in the above embodiments is only an example of the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the computer equipment can be divided into different functional modules to complete all or part of the functions described above. In addition, the precise wet flue gas desulfurization control system and the precise wet flue gas desulfurization control method embodiment provided in the above embodiments belong to the same concept, and the specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0109] It should be noted that the order of the above embodiments of the present invention is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0110] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

Claims

1. A precise wet flue gas desulfurization control method, characterized in that, The method includes: During the wet flue gas desulfurization process, the concentrations of sulfur oxides, sulfidation reaction ions, and environmental factors are obtained at all sampling times during the flue gas circulation period. The concentrations of sulfidation reaction ions are either calcium ion concentrations or magnesium ion concentrations. During the flue gas recirculation period, an index of the drastic change in the concentration of sulfide ions is obtained based on the degree of drastic change in the concentration of sulfide ions at continuous sampling times. This index is determined based on a difference factor and a drastic change factor for the sulfide ions. The difference factor is obtained by fusing the differences in the concentrations of all sulfide ions, and the difference in each sulfide ion concentration is obtained by sorting all sulfide ion concentrations according to the sampling time. The drastic change factor is determined based on the degree of dispersion in the distribution of sulfide ion concentrations. Based on the similarity between the changes in the concentrations of sulfur oxides and sulfide ions during the flue gas recirculation period, the data distribution of the sulfur oxide concentration, and the drastic change index, a desulfurization effect index for the flue gas recirculation period is obtained. Based on the data distribution of environmental factors during the flue gas recirculation period and the degree of correlation between changes in environmental factors and sulfur oxide concentration, environmental impact indicators for the flue gas recirculation period are obtained. Based on the desulfurization effect index and the environmental impact index, the delay power adjustment factor for the flue gas circulation period is obtained; based on the delay power adjustment factor and the power of the oxidation fan, the predicted delay power of the oxidation fan for the flue gas circulation period is obtained. Power control of the oxidation fan in wet flue gas desulfurization is performed based on the predicted delay power of the oxidation fan.

2. The precise wet flue gas desulfurization control method according to claim 1, characterized in that, The methods for obtaining the desulfurization effect indicators include: In terms of timing, based on the mean square error of the sulfur oxide concentration and the sulfide reaction ion concentration during the flue gas circulation period, a similarity factor between the changes in the sulfur oxide concentration and the sulfide reaction ion concentration is obtained; Based on the deviation between the sulfur oxide concentration and the preset standard value, the deviation factor of the sulfur oxide concentration is obtained; By integrating the change similarity factor, the deviation from the standard factor, and the drastic change index, the desulfurization effect index during the flue gas recirculation period is obtained; the change similarity factor and the desulfurization effect index are positively correlated; the deviation from the standard factor and the drastic change index are both negatively correlated with the desulfurization effect index.

3. The precise wet flue gas desulfurization control method according to claim 1, characterized in that, The environmental factors mentioned are: ambient temperature and ambient humidity.

4. The precise wet flue gas desulfurization control method according to claim 3, characterized in that, The methods for obtaining the environmental impact indicators include: During the flue gas circulation period, an environmental impact consistency factor is obtained based on the degree of difference in the fluctuation characteristics of the ambient temperature and ambient humidity. Based on the correlation between environmental factor data and the temporal changes in sulfur oxide concentration, an influence factor is obtained. Based on the environmental impact consistency factor and the impact degree factor, environmental impact indicators for the flue gas circulation period are obtained.

5. The precise wet flue gas desulfurization control method according to claim 4, characterized in that, The method for obtaining the environmental impact consistency factor includes: The absolute value of the difference between the fluctuation characteristics of ambient temperature and the fluctuation characteristics of ambient humidity is calculated to obtain the environmental impact consistency factor.

6. The precise wet flue gas desulfurization control method according to claim 4, characterized in that, The method for obtaining the influence factor includes: In terms of time sequence, the temperature influence factor is obtained based on the correlation coefficient between the ambient temperature and the sulfur oxide concentration during the flue gas circulation period; The humidity influence factor is obtained based on the correlation coefficient between the ambient humidity and the sulfur oxide concentration during the flue gas circulation period; By integrating the influence factors of temperature and humidity, the degree of influence factor is obtained.

7. The precise wet flue gas desulfurization control method according to claim 5, characterized in that, The fluctuation characteristic of the ambient temperature is the variance of the ambient temperature.

8. A precision wet flue gas desulfurization control system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the precise wet flue gas desulfurization control method as described in any one of claims 1 to 7.

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