Gas concentration regulation and control system for power plants

Abstract

The present invention relates to a gas concentration regulating and controlling system for a power plant, and to the technical field of gas control and management. It includes a gas control and management platform, a gas information unit, an opening and closing supervision unit, a mixing evaluation unit, a gas supply supervision unit, a concentration verification unit, and a control and management response unit. Under the premise that the electromagnetic valve at the air intake end opens and closes accurately, the present invention further performs a gas stability safety assessment and analysis on the gas characteristic data in the mixer to ensure the stability of gas power generation, and performs a gas supply risk supervision and assessment operation from the perspective of the front-end gas supply in the form of information, so as to perform reasonable management according to the feedback information, reduce the influence of the front-end gas supply equipment on the gas stability, and perform in-depth gas adjustment safety supervision at the same time, so as to perform reasonable supervision and adjustment on low-concentration gas and high-concentration gas according to intuitive text feedback, so as to obtain a gas concentration suitable for combustion power generation, and at the same time improve the regulation efficiency of low-concentration gas and high-concentration gas.

Description

Technical Field

[0001] The present invention relates to the technical field of gas control and management, and in particular to a gas concentration regulating and controlling system for a power plant. Background Art

[0002] Most of the current power plants use gas generators to convert the combustion energy of coal mine gas into electrical energy. Usually, the gas sources of power plants include high-concentration gas and low-concentration gas. In order to meet the power generation needs, it is usually necessary to mix high-concentration gas with low-concentration gas to control the gas concentration entering the generator internal combustion engine.

[0003] However, in the prior art, it is impossible to safely supervise the regulation of the electromagnetic valve at the air inlet end of the mixer, which is not conducive to the precise opening and closing of the electromagnetic valve at the air inlet end, and it is impossible to supervise the stability of the gas inside the mixer, which is in turn not conducive to stable power generation. In addition, it is impossible to supervise the air intake conditions of low-concentration gas and high-concentration gas, and it is impossible to reasonably regulate the low-concentration gas and high-concentration gas point-to-point, which is not conducive to precise mixing to obtain a gas concentration suitable for combustion power generation.

[0004] In view of the above technical defects, a solution is now proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a gas concentration control system for a power plant to solve the above-mentioned technical defects. The purpose of the present invention can be achieved through the following technical solutions:

[0006] The gas concentration control system of the power plant includes a gas control platform, a gas information unit, an opening and closing supervision unit, a mixing assessment unit, a gas supply supervision unit, a concentration verification unit, and a control response unit;

[0007] The gas information unit is used to collect the control data of the electromagnetic valve at the air inlet end of the mixer, the control data including the total number of historical adjustments and the actual opening value, and send the control data to the opening and closing supervision unit;

[0008] The opening and closing supervision unit is used to immediately perform opening and closing interference supervision evaluation and analysis on the control data after receiving the control data, and compare and analyze the obtained adjustment deviation value to obtain the accurate signal and the deviation signal;

[0009] The mixing evaluation unit is used to collect gas characteristic data inside the mixer, the gas characteristic data including a gas concentration characteristic curve and a gas flow characteristic curve, perform gas stability safety evaluation analysis on the gas characteristic data, and perform discriminant analysis on the obtained gaseous risk evaluation coefficient to obtain a normal signal and a risk signal;

[0010] The gas supply supervision unit is used to respond to the risk signal to perform a gas supply risk supervision assessment operation, perform a discriminant analysis on the obtained gas supply risk assessment rate Q, and obtain a qualified signal and a unqualified signal;

[0011] The concentration verification unit is used to collect gas parameter information, which includes low information parameters and high information parameters, to perform gas adjustment safety supervision on the gas parameter information, and to send the obtained non-standard signals and invalid signals to the management and control response unit.

[0012] Preferably, the opening and closing interference supervision evaluation and analysis process of the opening and closing supervision unit is as follows:

[0013] S1: Set a monitoring cycle and set it as a time threshold, obtain the total number of historical adjustments of the electromagnetic valve at the air inlet end of the mixer within the time threshold, obtain the adjustment time and actual opening value corresponding to each historical adjustment number, the adjustment time represents the time between the start adjustment time and the end adjustment time of the electromagnetic valve at the air inlet end of the mixer, and obtain the unit time opening and closing degree of each historical adjustment number based on the adjustment time and the actual opening value;

[0014] S2: Compare and analyze the opening and closing degree per unit time with the preset opening and closing degree threshold per unit time recorded and stored internally, set the number of adjustments corresponding to the opening and closing degree per unit time being equal to the preset opening and closing degree threshold per unit time as the stable adjustment number, and set the ratio between the number corresponding to the stable adjustment number and the total number of historical adjustments as the adjustment deviation value;

[0015] S3: Compare and analyze the adjustment deviation value with the preset adjustment deviation value threshold value recorded and stored internally:

[0016] If the adjustment deviation value is equal to the preset adjustment deviation value threshold, a precision signal is generated;

[0017] If the adjustment deviation value is not equal to the preset adjustment deviation value threshold, a deviation signal is generated.

[0018] Preferably, the gas stability safety assessment analysis process of the hybrid assessment unit is as follows:

[0019] The time threshold is divided into i sub-time periods, where i is a natural number greater than zero. The gas concentration characteristic curve and the gas flow characteristic curve in the mixer in each sub-time period are obtained. The maximum peak value and the minimum trough value are obtained from the gas concentration characteristic curve and the gas flow characteristic curve, respectively. The difference between the maximum peak value and the minimum trough value is set as the concentration span value and the flow span value, respectively. The concentration span value and the flow span value are compared and analyzed with the preset concentration span value range and the preset flow span value range stored in the internal input:

[0020] If the concentration span value belongs to the preset concentration span value range, and the flow span value belongs to the preset flow span value range, then the corresponding sub-time period is determined to be a steady-state period;

[0021] If the concentration span value does not belong to the preset concentration span value range, or the flow span value does not belong to the preset flow span value range, the corresponding sub-time period is determined to be a fluctuation period.

[0022] Preferably, the difference between the number corresponding to the fluctuation period and the number corresponding to the steady-state period within the time threshold is obtained, and the difference between the number corresponding to the fluctuation period and the number corresponding to the steady-state period is set as the gaseous risk assessment coefficient, and the gaseous risk assessment coefficient is compared and analyzed with the preset gaseous risk assessment coefficient threshold value recorded and stored internally:

[0023] If the ratio between the gaseous risk assessment coefficient and the preset gaseous risk assessment coefficient threshold is less than 1, a normal signal is generated;

[0024] If the ratio between the gaseous risk assessment coefficient and the preset gaseous risk assessment coefficient threshold is greater than or equal to 1, a risk signal is generated.

[0025] Preferably, the gas supply risk supervision and assessment operation process of the gas supply supervision unit is as follows:

[0026] T1: Obtain the actual steady-state gas pressure value curve of the front-end gas supply equipment in the steady-state period, and at the same time obtain the actual gas pressure value curve of the front-end gas supply equipment in the fluctuating period, draw the actual steady-state gas pressure value curve and the actual gas pressure value curve in the same coordinate system, mark m collection moments on the X-axis, where m is a natural number greater than zero, obtain the actual steady-state gas pressure value and the actual gas pressure value corresponding to each collection moment, and set the difference between the actual steady-state gas pressure value and the actual gas pressure value as the deviation evaluation value;

[0027] T2: Compare and analyze the deviation evaluation value with the preset deviation evaluation value threshold stored in it, set the collection time corresponding to the deviation evaluation value greater than the preset deviation evaluation value threshold as the abnormal time, obtain the number corresponding to the abnormal time, and set it as the abnormal time value n, and substitute m and n into the formula The gas supply risk assessment rate Q is obtained, and the gas supply risk assessment rate Q is compared and analyzed with the preset gas supply risk assessment rate threshold value recorded and stored internally:

[0028] If the ratio between the gas supply risk assessment rate Q and the preset gas supply risk assessment rate threshold is less than 1, a qualified signal is generated;

[0029] If the ratio between the gas supply risk assessment rate Q and the preset gas supply risk assessment rate threshold is greater than or equal to 1, a failure signal is generated.

[0030] Preferably, the gas adjustment safety supervision process of the concentration verification unit is as follows:

[0031] The low information parameters of the low-concentration gas entering the mixer within the time threshold are obtained, and the actual low-wattage evaluation coefficient R is calculated based on the low information parameters. The actual low-wattage evaluation coefficient R is compared and analyzed with the preset actual low-wattage evaluation coefficient range stored internally:

[0032] If the actual low-watt evaluation coefficient R falls within the preset actual low-watt evaluation coefficient range, no signal is generated;

[0033] If the actual low-watt evaluation coefficient R does not fall within the preset actual low-watt evaluation coefficient range, a non-standard signal is generated;

[0034] The high information parameters of the high-concentration gas entering the mixer within the time threshold are obtained, and the actual high-wattage evaluation coefficient G is calculated based on the high information parameters. The actual high-wattage evaluation coefficient G is compared and analyzed with the preset actual high-wattage evaluation coefficient range stored in the internal input:

[0035] If the actual high-wattage evaluation coefficient G falls within the preset actual high-wattage evaluation coefficient range, no signal is generated;

[0036] If the actual high-wattage evaluation coefficient G does not belong to the preset actual high-wattage evaluation coefficient range, an invalid signal is generated.

[0037] Preferably, the calculation and analysis process of the actual low-wattage evaluation coefficient R is as follows:

[0038] The low information parameters include the actual intake pressure value, the actual intake concentration value and the actual intake flow value. The actual intake pressure value, the actual intake concentration value and the actual intake flow value are labeled as SY, SN and SL respectively. Substitute the actual intake pressure value SY, the actual intake concentration value SN and the actual intake flow value SL into the formula Obtaining an actual low-wattage evaluation coefficient, wherein a1 is a preset error factor coefficient, a1 is greater than zero, and R is an actual low-wattage evaluation coefficient;

[0039] The calculation and analysis process of the actual high-watt evaluation coefficient G is as follows: The high-information parameters include the actual high-watt pressure value, the actual high-watt concentration value and the actual high-watt flow value. The actual high-watt pressure value, the actual high-watt concentration value and the actual high-watt flow value are labeled GY, GN and GL respectively. Substitute the actual high-watt pressure value GY, the actual high-watt concentration value GN and the actual high-watt flow value GL into the formula The actual high-wattage evaluation coefficient is obtained, where a2 is the preset correction factor coefficient, a2 is greater than zero, and G is the actual high-wattage evaluation coefficient.

[0040] The beneficial effects of the present invention are as follows:

[0041] The present invention performs opening and closing interference supervision, evaluation and analysis on the control data of the electromagnetic valve at the air inlet end of the mixer to understand whether the opening and closing accuracy of the electromagnetic valve at the air inlet end of the mixer is qualified, so as to ensure the opening and closing accuracy of the electromagnetic valve at the air inlet end of the mixer and reduce the influence of the opening and closing of the electromagnetic valve at the air inlet end of the mixer on the gas concentration. Under the premise of accurate opening and closing of the electromagnetic valve at the air inlet end, the gas characteristic data in the mixer is further evaluated and analyzed for gas stability safety to understand the gas stability in the mixer, so as to remind the operation and management personnel to manage the gas to ensure the stability of gas power generation.

[0042] The present invention performs gas supply risk supervision and assessment operations from the perspective of front-end gas supply through information, so as to analyze from a side perspective whether the abnormal stability of the gas concentration in the mixer is caused by the abnormal gas supply performance of the front-end gas supply equipment, so as to perform reasonable management according to the feedback information, thereby reducing the influence of the front-end gas supply equipment on the stability of the gas concentration in the mixer, and at the same time perform in-depth gas adjustment safety supervision, so as to perform reasonable supervision and adjustment of low-concentration gas and high-concentration gas according to intuitive text feedback, so as to obtain a gas concentration suitable for combustion and power generation, and at the same time improve the regulation efficiency of low-concentration gas and high-concentration gas, and reduce the abnormal gas stability in the mixer caused by the intake deviation of high-concentration gas and low-concentration gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention will be further described below in conjunction with the accompanying drawings;

[0044] Figure 1 is a system block diagram of the present invention; DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Example 1: Please refer to Figure 1, a gas concentration regulating and controlling system for a power plant provided by an embodiment of the present invention comprises a gas control and management platform, a gas information unit, an opening and closing supervision unit, a mixed evaluation unit, a gas supply supervision unit, a concentration verification unit and a control and management response unit, wherein the gas control and management platform is connected to the gas information unit in a one-way communication manner, the gas information unit is connected to the opening and closing supervision unit in a one-way communication manner, the opening and closing supervision unit is connected to the mixed evaluation unit and the control and management response unit in a one-way communication manner, the mixed evaluation unit is connected to the gas supply supervision unit, the concentration verification unit and the control and management response unit in a one-way communication manner, the gas supply supervision unit is connected to the control and management response unit in a one-way communication manner, and the concentration verification unit is connected to the control and management response unit in a one-way communication manner;

[0047] When the gas control platform generates a supervision instruction, it sends the supervision instruction to the gas information unit. After receiving the supervision instruction, the gas information unit immediately collects the control data of the electromagnetic valve at the air inlet end of the mixer. The control data includes the total number of historical adjustments and the actual opening value, and sends the control data to the opening and closing supervision unit. After receiving the control data, the opening and closing supervision unit immediately performs an opening and closing interference supervision evaluation and analysis on the control data to understand whether the opening and closing accuracy of the electromagnetic valve at the air inlet end of the mixer is qualified, so as to provide feedback maintenance in time to ensure the opening and closing accuracy of the electromagnetic valve at the air inlet end of the mixer and reduce the impact of the opening and closing of the electromagnetic valve at the air inlet end of the mixer on the gas concentration. The specific opening and closing interference supervision evaluation and analysis process is as follows:

[0048] S1: Set a monitoring cycle and set it as a time threshold, obtain the total number of historical adjustments of the electromagnetic valve at the air inlet end of the mixer within the time threshold, obtain the adjustment time and actual opening value corresponding to each historical adjustment number, the adjustment time represents the time between the start adjustment time and the end adjustment time of the electromagnetic valve at the air inlet end of the mixer, and obtain the unit time opening and closing degree of each historical adjustment number based on the adjustment time and the actual opening value; it should be noted that the unit time opening and closing degree is an evaluation value reflecting the opening and closing accuracy of the electromagnetic valve at the air inlet end of the mixer;

[0049] S2: Compare and analyze the unit time opening and closing degree with the preset unit time opening and closing degree threshold value recorded and stored internally, set the number of adjustments corresponding to the unit time opening and closing degree equal to the preset unit time opening and closing degree threshold value as the stable adjustment number, and set the ratio between the number corresponding to the stable adjustment number and the total number of historical adjustments as the adjustment deviation value; it should be noted that the larger the value of the adjustment deviation value, the greater the risk of abnormal opening and closing accuracy of the electromagnetic valve at the intake end of the mixer;

[0050] S3: Compare and analyze the adjustment deviation value with the preset adjustment deviation value threshold value recorded and stored internally:

[0051] If the adjustment deviation value is equal to the preset adjustment deviation value threshold, a precision signal is generated and the precision signal is sent to the hybrid evaluation unit;

[0052] If the adjustment deviation value is not equal to the preset adjustment deviation value threshold, a deviation signal is generated and sent to the control response unit. After receiving the deviation signal, the control response unit immediately displays the preset warning text corresponding to the deviation signal. The preset warning text corresponding to the deviation signal is "Control Deviation", so as to remind the operation management personnel to manage the electromagnetic valve at the air intake end according to the intuitive text feedback, so as to realize the precise opening and closing of the electromagnetic valve, and at the same time help to reduce the influence of the electromagnetic valve at the air intake end on the stability of the gas concentration in the mixer;

[0053] When an accurate signal is generated, that is, under the premise that the electromagnetic valve at the air inlet end opens and closes accurately, the mixed evaluation unit collects the gas characteristic data inside the mixer. The gas characteristic data includes the gas concentration characteristic curve and the gas flow characteristic curve, and performs a gas stability safety evaluation and analysis on the gas characteristic data to understand the gas stability in the mixer and improve the timeliness of gas supervision in the mixer. The specific gas stability safety evaluation and analysis process is as follows:

[0054] The time threshold is divided into i sub-time periods, where i is a natural number greater than zero. The gas concentration characteristic curve and the gas flow characteristic curve in the mixer in each sub-time period are obtained. The maximum peak value and the minimum trough value are obtained from the gas concentration characteristic curve and the gas flow characteristic curve, respectively. The difference between the maximum peak value and the minimum trough value is set as the concentration span value and the flow span value, respectively. The concentration span value and the flow span value are compared and analyzed with the preset concentration span value range and the preset flow span value range stored in the internal input:

[0055] If the concentration span value belongs to the preset concentration span value range, and the flow span value belongs to the preset flow span value range, then the corresponding sub-time period is determined to be a steady-state period;

[0056] If the concentration span value does not belong to the preset concentration span value range, or the flow span value does not belong to the preset flow span value range, then the corresponding sub-time period is determined to be a fluctuation period;

[0057] In the embodiment of the present invention, the steady-state period and the fluctuation period are quantitative evaluation results of the gas concentration and flow rate risks in the two types of reaction mixers;

[0058] The difference between the number corresponding to the fluctuation period and the number corresponding to the steady-state period within the time threshold is obtained, and the difference between the number corresponding to the fluctuation period and the number corresponding to the steady-state period is set as the gas risk assessment coefficient, and the gas risk assessment coefficient is compared and analyzed with the preset gas risk assessment coefficient threshold value stored in the internal input:

[0059] If the ratio between the gaseous risk assessment coefficient and the preset gaseous risk assessment coefficient threshold is less than 1, a normal signal is generated;

[0060] If the ratio between the gaseous risk assessment coefficient and the preset gaseous risk assessment coefficient threshold is greater than or equal to 1, a risk signal is generated and sent to the gas supply supervision unit, the concentration verification unit and the management and control response unit. After receiving the risk signal, the management and control response unit immediately displays the preset warning text corresponding to the risk signal. The preset warning text corresponding to the risk signal is "gas abnormality" to remind the operation management personnel to manage the gas to ensure the stability of gas power generation.

[0061] Embodiment 2: When a risk signal is generated, the gas supply monitoring unit performs a gas supply risk monitoring and evaluation operation from the perspective of the front-end gas supply, so as to understand whether the gas stability of the mixer is abnormal and whether the gas supply pressure of the front-end gas supply equipment changes under normal circumstances, so as to analyze from a side perspective whether the abnormal gas concentration stability of the mixer is caused by the abnormal gas supply pressure of the front-end gas supply equipment, so as to perform reasonable management according to the feedback information, thereby reducing the influence of the front-end gas supply equipment on the stability of the gas concentration in the mixer. The specific gas supply risk monitoring and evaluation operation process is as follows:

[0062] T1: Obtain the actual steady-state gas pressure value curve of the front-end gas supply equipment in the steady-state period, and at the same time obtain the actual gas pressure value curve of the front-end gas supply equipment in the fluctuating period, draw the actual steady-state gas pressure value curve and the actual gas pressure value curve in the same coordinate system, mark m collection moments on the X-axis, where m is a natural number greater than zero, obtain the actual steady-state gas pressure value and the actual gas pressure value corresponding to each collection moment, and set the difference between the actual steady-state gas pressure value and the actual gas pressure value as the deviation evaluation value; it should be noted that the deviation evaluation value is an influencing parameter reflecting the gas supply performance of the front-end gas supply equipment;

[0063] T2: Compare and analyze the deviation evaluation value with the preset deviation evaluation value threshold stored in it, set the collection time corresponding to the deviation evaluation value greater than the preset deviation evaluation value threshold as the abnormal time, obtain the number corresponding to the abnormal time, and set it as the abnormal time value n, and substitute m and n into the formula The gas supply risk assessment rate Q is obtained, and the gas supply risk assessment rate Q is compared and analyzed with the preset gas supply risk assessment rate threshold value recorded and stored internally:

[0064] If the ratio between the gas supply risk assessment rate Q and the preset gas supply risk assessment rate threshold is less than 1, a qualified signal is generated;

[0065] If the ratio between the gas supply risk assessment rate Q and the preset gas supply risk assessment rate threshold is greater than or equal to 1, an unqualified signal is generated, and the qualified signal and the unqualified signal are sent to the control response unit. After receiving the qualified signal and the unqualified signal, the control response unit immediately displays the preset warning texts corresponding to the qualified signal and the unqualified signal. The preset warning text corresponding to the qualified signal is "gas supply normal", and the preset warning text corresponding to the unqualified signal is "gas supply abnormal", so as to manage the gas supply of the front-end gas supply equipment according to the intuitive text feedback, so as to ensure the stability of the front-end gas supply capacity, thereby reducing the influence of the front-end gas supply equipment on the stability of the gas concentration in the mixer;

[0066] When a risk signal is generated, the concentration verification unit analyzes the two intake parameters of low-concentration gas and high-concentration gas, that is, collects gas parameter information, including the low information parameters of the low-concentration gas of the mixer and the high information parameters of the high-concentration gas, and conducts gas adjustment safety supervision on the gas parameter information, so as to reasonably supervise and adjust the low-concentration gas and high-concentration gas according to the intuitive text feedback to meet the gas concentration suitable for combustion power generation, and at the same time reduce the intake deviation of high-concentration gas and low-concentration gas, which leads to abnormal gas stability in the mixer. The specific gas adjustment safety supervision process is as follows:

[0067] The low information parameters of the low-concentration gas entering the mixer within the time threshold are obtained, and the actual low-wattage evaluation coefficient R is calculated based on the low information parameters. The calculation and analysis process of the actual low-wattage evaluation coefficient R is as follows: the low information parameters include the actual intake pressure value, the actual intake concentration value and the actual intake flow value. The actual intake pressure value, the actual intake concentration value and the actual intake flow value are labeled as SY, SN and SL respectively. The actual intake pressure value SY, the actual intake concentration value SN and the actual intake flow value SL are substituted into the formula The actual low-wattage evaluation coefficient is obtained, where a1 is the preset error factor coefficient, a1 is greater than zero, and R is the actual low-wattage evaluation coefficient; the actual low-wattage evaluation coefficient R is compared and analyzed with the preset actual low-wattage evaluation coefficient range stored in the internal input:

[0068] If the actual low-watt evaluation coefficient R falls within the preset actual low-watt evaluation coefficient range, no signal is generated;

[0069] If the actual low-watt evaluation coefficient R does not fall within the preset actual low-watt evaluation coefficient range, a non-standard signal is generated;

[0070] The high information parameters of the high-concentration gas entering the mixer within the time threshold are obtained, and the actual high-watt evaluation coefficient G is calculated based on the high information parameters. The calculation and analysis process of the actual high-watt evaluation coefficient G is as follows: the high information parameters include the actual high-watt pressure value, the actual high-watt concentration value and the actual high-watt flow value. The actual high-watt pressure value, the actual high-watt concentration value and the actual high-watt flow value are labeled GY, GN and GL respectively. The actual high-watt pressure value GY, the actual high-watt concentration value GN and the actual high-watt flow value GL are substituted into the formula The actual high-wattage evaluation coefficient is obtained, where a2 is the preset correction factor coefficient, a2 is greater than zero, and G is the actual high-wattage evaluation coefficient; the actual high-wattage evaluation coefficient G is compared and analyzed with the preset actual high-wattage evaluation coefficient range stored in the internal input:

[0071] If the actual high-wattage evaluation coefficient G falls within the preset actual high-wattage evaluation coefficient range, no signal is generated;

[0072] If the actual high-watt evaluation coefficient G does not fall within the preset actual high-watt evaluation coefficient range, an invalid signal is generated, and the non-standard signal and the invalid signal are sent to the management and control response unit. After receiving the non-standard signal and the invalid signal, the management and control response unit immediately displays the preset warning text corresponding to the non-standard signal and the invalid signal. The preset warning text corresponding to the non-standard signal is "low-watt adjustment", and the preset warning text corresponding to the invalid signal is "high-watt adjustment", so as to make reasonable supervision and adjustment of low-concentration gas and high-concentration gas according to intuitive text feedback to meet the gas concentration suitable for combustion power generation, and at the same time help to improve the power generation effect.

[0073] In summary, the present invention performs an opening and closing interference supervision and evaluation analysis on the control data of the electromagnetic valve at the air inlet end of the mixer to understand whether the opening and closing accuracy of the electromagnetic valve at the air inlet end of the mixer is qualified, so as to ensure the opening and closing accuracy of the electromagnetic valve at the air inlet end of the mixer and reduce the influence of the opening and closing of the electromagnetic valve at the air inlet end of the mixer on the gas concentration. On the premise that the opening and closing of the electromagnetic valve at the air inlet end is accurate, the gas stability safety evaluation and analysis is further performed on the gas characteristic data in the mixer to understand the gas stability in the mixer, so as to remind the operation and management personnel to manage the gas to ensure the stability of gas power generation, and to provide gas from the perspective of front-end gas supply through information. The gas risk supervision and assessment operation is carried out to analyze from a side perspective whether the abnormal stability of the gas concentration in the mixer is caused by the abnormal gas supply performance of the front-end gas supply equipment, so as to carry out reasonable management according to the feedback information, thereby reducing the impact of the front-end gas supply equipment on the stability of the gas concentration in the mixer. At the same time, in-depth gas adjustment safety supervision is carried out to make reasonable regulatory adjustments to low-concentration gas and high-concentration gas according to intuitive text feedback to obtain a gas concentration suitable for combustion and power generation, while improving the regulation efficiency of low-concentration gas and high-concentration gas, and reducing the abnormal gas stability in the mixer caused by the intake deviation of high-concentration gas and low-concentration gas.

[0074] The threshold is set to facilitate comparison. The size of the threshold depends on the amount of sample data and the number of bases set by technicians in this field for each group of sample data; as long as it does not affect the proportional relationship between the parameter and the quantized value.

[0075] The above formulas are obtained by collecting a large amount of data for software simulation and selecting a formula that is close to the actual value. The coefficients in the formula are set by technical personnel in this field according to actual conditions. The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited to this. Any technical personnel familiar with the technical field within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, make equivalent replacement or change, which should be covered within the protection scope of the present invention.

Claims

1. A gas concentration control system for a power plant, characterized in that: It includes gas control platform, gas information unit, opening and closing supervision unit, mixing assessment unit, gas supply supervision unit, concentration verification unit and control response unit; The gas information unit is used to collect the control data of the electromagnetic valve at the air inlet end of the mixer, the control data including the total number of historical adjustments and the actual opening value, and send the control data to the opening and closing supervision unit; The opening and closing supervision unit is used to immediately perform opening and closing interference supervision evaluation and analysis on the control data after receiving the control data, and compare and analyze the obtained adjustment deviation value to obtain the accurate signal and the deviation signal; specifically including: S1: Set a monitoring cycle and set it as a time threshold, obtain the total number of historical adjustments of the electromagnetic valve at the air inlet end of the mixer within the time threshold, obtain the adjustment time and actual opening value corresponding to each historical adjustment number, the adjustment time represents the time between the start adjustment time and the end adjustment time of the electromagnetic valve at the air inlet end of the mixer, and obtain the unit time opening and closing degree of each historical adjustment number based on the adjustment time and the actual opening value; S2: Compare and analyze the opening and closing degree per unit time with the preset opening and closing degree threshold per unit time recorded and stored internally, set the number of adjustments corresponding to the opening and closing degree per unit time being equal to the preset opening and closing degree threshold per unit time as the stable adjustment number, and set the ratio between the number corresponding to the stable adjustment number and the total number of historical adjustments as the adjustment deviation value; S3: Compare and analyze the adjustment deviation value with the preset adjustment deviation value threshold value recorded and stored internally: If the adjustment deviation value is equal to the preset adjustment deviation value threshold, a precision signal is generated; If the adjustment deviation value is not equal to the preset adjustment deviation value threshold, a deviation signal is generated; The mixing evaluation unit is used to collect gas characteristic data inside the mixer, the gas characteristic data including a gas concentration characteristic curve and a gas flow characteristic curve, perform gas stability safety evaluation analysis on the gas characteristic data, and perform discriminant analysis on the obtained gaseous risk evaluation coefficient to obtain a normal signal and a risk signal; The gas supply supervision unit is used to respond to the risk signal to perform a gas supply risk supervision assessment operation, perform a discriminant analysis on the obtained gas supply risk assessment rate Q, and obtain a qualified signal and a unqualified signal; The concentration verification unit is used to collect gas parameter information, including low information parameters and high information parameters, to perform gas adjustment safety supervision on the gas parameter information, and to send the obtained non-standard signals and invalid signals to the management and control response unit; The low information parameters include the actual intake pressure value, the actual intake concentration value and the actual intake flow value of low-concentration gas; The high information parameters include the actual high-watt pressure value, the actual high-watt concentration value and the actual high-watt flow value of the high-concentration gas.

2. The gas concentration regulation and control system for a power plant according to claim 1, characterized in that: The gas stability safety assessment analysis process of the hybrid assessment unit is as follows: Set a monitoring cycle and set it as a time threshold, divide the time threshold into i sub-time periods, where i is a natural number greater than zero, obtain the gas concentration characteristic curve and gas flow characteristic curve inside the mixer in each sub-time period, obtain the maximum peak value and the minimum trough value from the gas concentration characteristic curve and the gas flow characteristic curve, respectively, and set the difference between the maximum peak value and the minimum trough value as the concentration span value and the flow span value, respectively, and compare and analyze the concentration span value and the flow span value with the preset concentration span value range and the preset flow span value range stored in the internal input: If the concentration span value belongs to the preset concentration span value range, and the flow span value belongs to the preset flow span value range, then the corresponding sub-time period is determined to be a steady-state period; If the concentration span value does not belong to the preset concentration span value range, or the flow span value does not belong to the preset flow span value range, the corresponding sub-time period is determined to be a fluctuation period.

3. The gas concentration regulating and controlling system for a power plant according to claim 2, characterized in that: The difference between the number corresponding to the fluctuation period and the number corresponding to the steady-state period within the time threshold is obtained, and the difference between the number corresponding to the fluctuation period and the number corresponding to the steady-state period is set as the gaseous risk assessment coefficient, and the gaseous risk assessment coefficient is compared and analyzed with the preset gaseous risk assessment coefficient threshold value recorded and stored internally: If the ratio between the gaseous risk assessment coefficient and the preset gaseous risk assessment coefficient threshold is less than 1, a normal signal is generated; If the ratio between the gaseous risk assessment coefficient and the preset gaseous risk assessment coefficient threshold is greater than or equal to 1, a risk signal is generated.

4. The gas concentration regulating and controlling system for a power plant according to claim 1, characterized in that: The gas supply risk supervision and assessment operation process of the gas supply supervision unit is as follows: T1: Obtain the actual steady-state gas pressure value curve of the front-end gas supply equipment in the steady-state period, and at the same time obtain the actual gas pressure value curve of the front-end gas supply equipment in the fluctuating period, draw the actual steady-state gas pressure value curve and the actual gas pressure value curve in the same coordinate system, mark m collection moments on the X-axis, where m is a natural number greater than zero, obtain the actual steady-state gas pressure value and the actual gas pressure value corresponding to each collection moment, and set the difference between the actual steady-state gas pressure value and the actual gas pressure value as the deviation evaluation value; T2: Compare and analyze the deviation evaluation value with the preset deviation evaluation value threshold stored in it, set the collection time corresponding to the deviation evaluation value greater than the preset deviation evaluation value threshold as the abnormal time, obtain the number corresponding to the abnormal time, and set it as the abnormal time value n, and substitute m and n into the formula The gas supply risk assessment rate Q is obtained, and the gas supply risk assessment rate Q is compared and analyzed with the preset gas supply risk assessment rate threshold value recorded and stored internally: If the ratio between the gas supply risk assessment rate Q and the preset gas supply risk assessment rate threshold is less than 1, a qualified signal is generated; If the ratio between the gas supply risk assessment rate Q and the preset gas supply risk assessment rate threshold is greater than or equal to 1, a failure signal is generated.

5. The gas concentration regulating and controlling system for a power plant according to claim 1, characterized in that: The gas adjustment safety supervision process of the concentration verification unit is as follows: The low information parameters of the low-concentration gas entering the mixer within the time threshold are obtained, and the actual low-wattage evaluation coefficient R is calculated based on the low information parameters. The actual low-wattage evaluation coefficient R is compared and analyzed with the preset actual low-wattage evaluation coefficient range stored internally: If the actual low-watt evaluation coefficient R falls within the preset actual low-watt evaluation coefficient range, no signal is generated; If the actual low-watt evaluation coefficient R does not fall within the preset actual low-watt evaluation coefficient range, a non-standard signal is generated; The high information parameters of the high-concentration gas entering the mixer within the time threshold are obtained, and the actual high-wattage evaluation coefficient G is calculated based on the high information parameters. The actual high-wattage evaluation coefficient G is compared and analyzed with the preset actual high-wattage evaluation coefficient range stored in the internal input: If the actual high-wattage evaluation coefficient G falls within the preset actual high-wattage evaluation coefficient range, no signal is generated; If the actual high-wattage evaluation coefficient G does not belong to the preset actual high-wattage evaluation coefficient range, an invalid signal is generated.

6. The gas concentration regulating and controlling system for a power plant according to claim 5, characterized in that: The calculation and analysis process of the actual low-watt evaluation coefficient R is as follows: The actual intake pressure value, the actual intake concentration value, and the actual intake flow value are labeled SY, SN, and SL respectively. Substitute the actual intake pressure value SY, the actual intake concentration value SN, and the actual intake flow value SL into the formula Obtaining an actual low-wattage evaluation coefficient, wherein a1 is a preset error factor coefficient, a1 is greater than zero, and R is an actual low-wattage evaluation coefficient; The calculation and analysis process of the actual high-watt evaluation coefficient G is as follows: the actual high-watt pressure value, the actual high-watt concentration value and the actual high-watt flow value are labeled GY, GN and GL respectively, and the actual high-watt pressure value GY, the actual high-watt concentration value GN and the actual high-watt flow value GL are substituted into the formula The actual high-wattage evaluation coefficient is obtained, where a2 is the preset correction factor coefficient, a2 is greater than zero, and G is the actual high-wattage evaluation coefficient.

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