Automatic calibration system and method for waste gas purification equipment, hardware equipment and storage medium

Abstract

The invention relates to the technical field of industrial pollution source emission and purification, and discloses an automatic calibration system and method for waste gas purification equipment, hardware equipment and a storage medium. The system comprises an either-or switch, at least two sensors and a controller; driving the one-out-of-two switch to switch from the communication of the first movable end and the first sensor to the communication of the second movable end and the first sensor, so that the first sensor collects the first inlet gas concentration at an inlet gas sampling pipe of the waste gas purification equipment to be calibrated; and calibrating the second sensor based on the first inlet gas concentration and the second inlet gas concentration until the first inlet gas concentration is the same as the second inlet gas concentration. Sensitivity and accuracy of the sensors for measuring the gas inlet and the gas outlet of the waste gas purification equipment to be calibrated are ensured, the purification efficiency of the waste gas purification equipment is accurately measured and calculated, the requirement for low cost is considered, and popularization and application are easy.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial pollution source emission purification, and in particular to an automatic calibration system, method, hardware equipment and storage medium for waste gas purification equipment. Background Art

[0002] With the development of the national economy, emissions from industrial pollution sources have become the main factor causing atmospheric pollution. The main waste gas emitted by industrial pollution sources is volatile organic compounds (VOCs). VOCs are the main precursors of fine particulate matter PM2.5 and ozone (O3). In practical applications, industrial enterprises use various purification equipment to reduce the VOCs content in waste gas emissions. These methods vary according to different waste gas characteristics, concentrations and treatment requirements.

[0003] In the related technologies, due to the irregular management of industrial enterprises, when the purification equipment fails or the purification capacity is reduced, the enterprises do not regularly maintain or service it, which will cause the emission to exceed the standard. However, there is a lack of low-cost and high-reliability monitoring solutions and technologies for purification equipment, making it difficult to evaluate the effectiveness of the treatment process and determine the maintenance cycle of the purification equipment. Summary of the invention

[0004] In view of this, the present invention provides an automatic calibration system, method, hardware device and storage medium for exhaust gas purification equipment to solve the problem of lack of low-cost, high-reliability monitoring solutions and technologies for purification equipment.

[0005] In a first aspect, the present invention provides an automatic calibration system for exhaust gas purification equipment, the system comprising a two-choice switch, at least two sensors and a controller:

[0006] The first movable end of the two-choice switch is connected to the outlet gas sampling tube of the exhaust gas purification device to be calibrated, the second movable end of the two-choice switch is connected to the inlet gas sampling tube of the exhaust gas purification device to be calibrated, and the fixed end of the two-choice switch is connected to the first sensor;

[0007] The second sensor is connected to the inlet gas sampling tube of the exhaust gas purification device to be calibrated, and is used to collect the second inlet gas concentration at the inlet gas sampling tube of the exhaust gas purification device to be calibrated;

[0008] The controller is connected to the two-to-one switch, the first sensor and the second sensor, and is used to drive the two-to-one switch to switch from the first moving end connected to the first sensor to the second moving end connected to the first sensor at an interval of a second preset time period, so that the first sensor collects the first inlet gas concentration at the inlet gas sampling tube of the exhaust gas purification equipment to be calibrated, and calibrates the second sensor based on the first inlet gas concentration and the second inlet gas concentration until the first inlet gas concentration is the same as the second inlet gas concentration.

[0009] In the present invention, a two-choice switch, at least two sensors and a controller together constitute an automatic calibration system for exhaust gas purification equipment. By driving the two-choice switch to switch, the first sensor measuring the gas concentration at the outlet of the exhaust gas purification equipment to be calibrated is switched to measure the gas concentration at the inlet of the exhaust gas purification equipment to be calibrated. The first sensor is used to calibrate the second sensor measuring the gas concentration at the inlet of the exhaust gas purification equipment to be calibrated, thereby ensuring the sensitivity and accuracy of the sensors measuring the inlet and outlet of the exhaust gas purification equipment to be calibrated, achieving accurate measurement and calculation of the purification efficiency of the exhaust gas purification equipment, and providing direct data support for evaluating the expected life and maintenance cycle of the purification equipment. At the same time, the requirements of low cost are taken into account, and it is easy to popularize and apply.

[0010] In an optional embodiment, the controller is also used to drive the first sensor to measure the outlet gas concentration at the outlet gas sampling tube of the exhaust gas purification device to be calibrated at intervals of a first preset time period, and drive the second sensor to measure the second inlet gas concentration at the inlet gas sampling tube of the exhaust gas purification device to be calibrated.

[0011] In this manner, the controller controls the first sensor and the second sensor to collect gas concentration at intervals of a second preset time period, and there is no need to collect gas concentration all the time, which reduces the loss of the sensor and the energy consumption of the sensor, further saving costs.

[0012] In an optional embodiment, the controller is also used to determine whether the second inlet gas concentration reaches a preset threshold value. When the second inlet gas concentration reaches the preset threshold value, the two-to-one switch is driven to switch from the first moving end being connected to the first sensor to the second moving end being connected to the first sensor.

[0013] In this method, since the sensor will produce a relatively large deviation in measurement when the inlet gas concentration of the exhaust gas purification equipment to be calibrated is too low, it is meaningless to calibrate when the concentration is too low. Therefore, calibration is performed after the gas concentration reaches the preset threshold value, which reduces the measurement deviation and avoids inaccurate calibration.

[0014] In an optional embodiment, the controller calibrates the second sensor based on the first inlet gas concentration and the second inlet gas concentration, including:

[0015] A first proportionality coefficient of the first sensor and a second proportionality coefficient of the second sensor are calculated based on the first inlet gas concentration and the second inlet gas concentration, and the second proportionality coefficient of the second sensor is modified based on the first proportionality coefficient and the second proportionality coefficient until the first inlet gas concentration is the same as the second inlet gas concentration.

[0016] In this method, due to long-term exposure to highly polluted gases, the sensors are contaminated by the gases, resulting in a decrease in sensitivity. The degree of sensitivity decrease varies from sensor to sensor, so the absolute value of the sensor gas concentration may be inaccurate. However, the ratio between different sensors is accurate, so the purification efficiency of the exhaust gas purification equipment can be converted through the proportional coefficient, thereby improving the accuracy of sensor calibration.

[0017] In a second aspect, the present invention provides an automatic calibration method for exhaust gas purification equipment, which is applied to an automatic calibration system for exhaust gas purification equipment as described in any one of the first aspects, wherein the system includes a two-choice switch, at least two sensors and a controller, and the method includes:

[0018] At intervals of a first preset time period, driving the first sensor to measure the outlet gas concentration at the outlet gas sampling pipe of the exhaust gas purification device to be calibrated, and driving the second sensor to measure the second inlet gas concentration at the inlet gas sampling pipe of the exhaust gas purification device to be calibrated;

[0019] At intervals of a second preset time period, driving the two-select-one switch to switch from the first movable end being connected to the first sensor to the second movable end being connected to the first sensor, so that the first sensor collects the first inlet gas concentration at the inlet gas sampling pipe of the exhaust gas purification device to be calibrated;

[0020] The second sensor is calibrated based on the first inlet gas concentration and the second inlet gas concentration until the first inlet gas concentration is the same as the second inlet gas concentration.

[0021] In the present invention, the first sensor is used to calibrate the second sensor for measuring the gas concentration at the air inlet of the exhaust gas purification device to be calibrated by the automatic calibration system of the exhaust gas purification device, thereby ensuring the sensitivity and accuracy of the sensors for measuring the air inlet and air outlet of the exhaust gas purification device to be calibrated, and accurately measuring and calculating the purification efficiency of the exhaust gas purification device, thereby providing direct data support for evaluating the expected life and maintenance cycle of the purification device. At the same time, the requirements of low cost are taken into account, and it is easy to popularize and apply.

[0022] In an optional embodiment, the method further includes:

[0023] Determining whether the second inlet gas concentration reaches a preset threshold value;

[0024] When the gas concentration at the second inlet reaches a preset threshold value, the two-select-one switch is driven to switch from the first movable end being connected to the first sensor to the second movable end being connected to the first sensor.

[0025] In this method, since the sensor will produce a relatively large deviation in measurement when the inlet gas concentration of the exhaust gas purification equipment to be calibrated is too low, it is meaningless to calibrate when the concentration is too low. Therefore, calibration is performed after the gas concentration reaches the preset threshold value, which reduces the occurrence of inaccurate calibration and further improves the measurement accuracy of the automatic calibration system of the exhaust gas purification equipment.

[0026] In an optional embodiment, calibrating the second sensor based on the first inlet gas concentration and the second inlet gas concentration includes:

[0027] Based on the first inlet gas concentration and the second inlet gas concentration, calculate a first proportionality coefficient of the first sensor and a second proportionality coefficient of the second sensor;

[0028] Based on the first proportionality factor and the second proportionality factor, the second proportionality factor of the second sensor is modified until the first inlet gas concentration is the same as the second inlet gas concentration.

[0029] In this method, since the sensor arranged at the outlet of the exhaust gas purification equipment is less polluted and has a more stable working state, the proportional coefficient of the first sensor arranged at the outlet is used to calibrate the second sensor arranged at the inlet to improve the measurement accuracy of the second sensor, thereby further realizing accurate measurement and calculation of the purification efficiency of the exhaust gas purification equipment.

[0030] In a third aspect, the present invention provides a hardware device, comprising: a memory and a processor, the memory and the processor are communicatively connected to each other, computer instructions are stored in the memory, and the processor executes the automatic calibration method of the exhaust gas purification equipment of the above-mentioned second aspect or any corresponding embodiment thereof by executing the computer instructions.

[0031] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the automatic calibration method for exhaust gas purification equipment according to the second aspect or any corresponding embodiment thereof.

[0032] In a fifth aspect, the present invention provides a computer program product, comprising computer instructions for causing a computer to execute the method for automatic calibration of an exhaust gas purification device according to the second aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 is a schematic structural diagram of a VOCs monitoring device according to method 1 of an embodiment of the present invention.

[0035] Figure 2 Schematic diagram of the structure of a VOCs monitoring device according to method 2 of an embodiment of the present invention.

[0036] Figure 3 It is a structural schematic diagram of an automatic calibration system for exhaust gas purification equipment according to an embodiment of the present invention.

[0037] Figure 4 Schematic diagram of a sampling gas passage for normal measurement according to an embodiment of the present invention.

[0038] Figure 5 Schematic diagram of a sampling gas passage during calibration according to an embodiment of the present invention.

[0039] Figure 6 It is a flow chart of an automatic calibration method for exhaust gas purification equipment according to an embodiment of the present invention.

[0040] Figure 7 It is a flow chart of an automatic calibration method for VOCs waste gas purification equipment according to an embodiment of the present invention.

[0041] Figure 8 It is a schematic diagram of the hardware structure of the hardware device of the embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0043] In the related art, if you want to measure the purification efficiency of the purification equipment, you need to use detection equipment to measure the VOCs concentration at the exhaust gas inlet and the treated exhaust gas outlet of the equipment respectively. There are two conventional methods to measure the VOCs concentration at the inlet and outlet of the purification equipment:

[0044] Method 1 includes two sets of VOCs monitoring equipment, each set of equipment contains a VOCs sensor, which measures the VOCs concentration at two points respectively. Figure 1 is a schematic diagram of the structure of a VOCs monitoring device according to method 1 of an embodiment of the present invention, such as Figure 1 As shown, the working principle of the VOCs monitoring equipment of method 1 includes: the monitoring device has two identical gas paths, the gas at the sampling inlet and outlet is extracted by an air pump, and the two sensors respectively measure the VOCs concentration and calculate the purification efficiency. The advantage of method 1 is that the VOCs concentration at the inlet gas sampling tube 420 and the outlet gas sampling tube 410 of the exhaust gas purification equipment 400 can be measured in real time and the purification efficiency can be calculated in real time. However, there is a disadvantage that the consistency of the two VOCs sensors cannot be guaranteed. After a period of work, pollutants will be attached to the sensors, resulting in a decrease in measurement sensitivity. In particular, the concentration of imported VOCs is higher, and the attachment of pollutants is more serious, which has a greater impact on the sensor. The difference in accuracy of the two sensors will lead to inaccurate measurements and inaccurate calculated purification efficiency.

[0045] Method 2 is to use a set of VOCs monitoring equipment to measure the VOCs concentration at the inlet and outlet at different times. Figure 2 is a schematic diagram of the structure of a VOCs monitoring device according to method 2 of an embodiment of the present invention, such as Figure 2 As shown, the working principle of the VOCs monitoring equipment of method 2 includes: the monitoring device switches the gas path at a fixed time, and uses the same sensor to measure the concentration of VOCs in the two exhaust gas sampling tubes 420 and 410 of the exhaust gas purification equipment 400. The advantages of method 2 include: low cost, only one sensor is used; good consistency, the same sensor is used for measurement, and the change in the accuracy of the VOCs sensor does not affect the accuracy of the purification efficiency. The disadvantage is that the two sensors are measured in time, and the sensor measurement concentration also requires a certain stabilization time. It takes several minutes for the channel to switch to the stable concentration value output by the sensor, plus the time for the pipeline to extract gas, so the time difference between the inlet and outlet measurements is several minutes or even longer. Since the concentration of the exhaust gas changes randomly, the inlet concentration is measured first, and the outlet concentration is measured a few minutes later. The outlet exhaust gas is not the gas after the inlet exhaust gas has been purified a few minutes ago. In this way, the inlet VOCs concentration and outlet concentration measured in time are calculated, and then the purification efficiency is calculated. It is only meaningful when the concentration of the imported VOCs component is stable within a few minutes. The purification efficiency value measured by method 2 is not stable in most cases. Within a certain period of time, the inlet and outlet concentration data fluctuate greatly, and the calculated purification efficiency also fluctuates irregularly, which limits the application scenarios of the method 2 equipment.

[0046] In order to solve the above problems, an automatic calibration system for exhaust gas purification equipment is provided in an embodiment of the present invention. The automatic calibration system for exhaust gas purification equipment in this embodiment is suitable for the use scenario of online monitoring of the purification efficiency and expected life of VOCs exhaust gas purification equipment. The present invention provides an automatic calibration system for exhaust gas purification equipment. A two-choice switch, at least two sensors and a controller together constitute an automatic calibration system for exhaust gas purification equipment. By driving the two-choice switch to switch, the first sensor measuring the gas concentration at the outlet of the exhaust gas purification equipment to be calibrated is switched to measure the gas concentration at the inlet of the exhaust gas purification equipment to be calibrated. The first sensor is used to calibrate the second sensor measuring the gas concentration at the inlet of the exhaust gas purification equipment to be calibrated, ensuring the sensitivity and accuracy of the sensors measuring the inlet and outlet of the exhaust gas purification equipment to be calibrated, realizing accurate measurement and calculation of the purification efficiency of the exhaust gas purification equipment, and providing direct data support for evaluating the expected life and maintenance cycle of the purification equipment. At the same time, it takes into account the requirements of low cost and is easy to popularize and apply.

[0047] According to an embodiment of the present invention, an embodiment of an automatic calibration system for exhaust gas purification equipment is provided. Figure 3 is a schematic diagram of the structure of an automatic calibration system for exhaust gas purification equipment according to an embodiment of the present invention. Figure 3 As shown, the automatic calibration system for exhaust gas purification equipment includes: a two-choice switch 100, at least two sensors and a controller 300: the first movable end of the two-choice switch 100 is connected to the outlet gas sampling tube 410 of the exhaust gas purification equipment 400 to be calibrated, the second movable end of the two-choice switch 100 is connected to the inlet gas sampling tube 420 of the exhaust gas purification equipment 400 to be calibrated, and the fixed end of the two-choice switch 100 is connected to the first sensor 210; the second sensor 220 is connected to the inlet gas sampling tube 420 of the exhaust gas purification equipment 400 to be calibrated, and is used to collect the inlet gas sampling tube 420 of the exhaust gas purification equipment 400 to be calibrated. The controller 300 is connected to the two-to-one switch 100, the first sensor 210 and the second sensor 220, and is used to drive the two-to-one switch 100 to switch from the first moving end connected to the first sensor 210 to the second moving end connected to the first sensor 210 at an interval of a second preset time period, so that the first sensor 210 collects the first inlet gas concentration at the inlet gas sampling tube 420 of the exhaust gas purification equipment 400 to be calibrated, and calibrates the second sensor 220 based on the first inlet gas concentration and the second inlet gas concentration until the first inlet gas concentration is the same as the second inlet gas concentration.

[0048] In an optional embodiment, the controller 300 is also used to drive the first sensor 210 to measure the outlet gas concentration at the outlet gas sampling tube 410 of the exhaust gas purification equipment to be calibrated 400 at intervals of a first preset time period, and drive the second sensor 220 to measure the second inlet gas concentration at the inlet gas sampling tube 420 of the exhaust gas purification equipment to be calibrated 400.

[0049] In this manner, the controller controls the first sensor and the second sensor to collect gas concentration at intervals of a second preset time period, and there is no need to collect gas concentration all the time, which reduces the loss of the sensor and the energy consumption of the sensor, further saving costs.

[0050] In an optional embodiment, the controller 300 is also used to determine whether the second inlet gas concentration reaches a preset threshold value. When the second inlet gas concentration reaches the preset threshold value, the two-to-one switch 100 is driven to switch from the first moving end being connected to the first sensor 210 to the second moving end being connected to the first sensor 210.

[0051] In this method, since the sensor will produce a relatively large deviation in measurement when the inlet gas concentration of the exhaust gas purification equipment to be calibrated is too low, it is meaningless to calibrate when the concentration is too low. Therefore, calibration is performed after the gas concentration reaches the preset threshold value, which reduces the measurement deviation and avoids inaccurate calibration.

[0052] In an optional embodiment, the controller 300 calibrates the second sensor based on the first inlet gas concentration and the second inlet gas concentration, including: calculating a first proportional coefficient of the first sensor 210 and a second proportional coefficient of the second sensor 220 based on the first inlet gas concentration and the second inlet gas concentration, and modifying the second proportional coefficient of the second sensor 220 based on the first proportional coefficient and the second proportional coefficient until the first inlet gas concentration is the same as the second inlet gas concentration.

[0053] In this method, due to long-term exposure to highly polluted gases, the sensors are contaminated by the gases, resulting in a decrease in sensitivity. The degree of sensitivity decrease varies from sensor to sensor, so the absolute value of the sensor gas concentration may be inaccurate. However, the ratio between different sensors is accurate, so the purification efficiency of the exhaust gas purification equipment can be converted through the proportional coefficient, thereby improving the accuracy of sensor calibration.

[0054] In one implementation scenario, the working principle of the automatic calibration system for exhaust gas purification equipment includes: using a set of systems to realize online monitoring of multiple VOCs points, and configuring two or more VOCs sensors in the system. The inlet and outlet of the exhaust gas purification equipment are connected to the first VOCs sensor 210 through a two-choice switch. The outlet gas of the exhaust gas purification equipment is connected to the second VOCs sensor 220.

[0055] During normal measurement, Figure 4 Schematic diagram of a sampling gas passage for normal measurement according to an embodiment of the present invention. Figure 4 As shown, the first sensor 210 measures the VOCs concentration at the inlet of the exhaust gas purification device 400; the second sensor 220 measures the VOCs concentration at the outlet of the exhaust gas purification device 400, thereby achieving simultaneous measurement of the VOCs concentrations at the inlet and outlet of the exhaust gas purification device 400.

[0056] At regular intervals, the controller 300 drives the two-choice switch 100 to switch the inlet gas path of the first sensor 210 to the outlet gas path. Figure 5 is a schematic diagram of a sampling gas passage during calibration according to an embodiment of the present invention, such as Figure 5 As shown, at this time, both sensors are fed with imported gas for simultaneous measurement, and the second sensor 220 is automatically calibrated based on the VOCs detection value of the first sensor 210, so that the measurement results of the two sensors are consistent, thereby ensuring the consistency of the measurement results of the two sensors. Regular manual calibration can be performed by operation and maintenance personnel, and standard sample gas can be passed from the imported gas sampling tube 420, and full-scale calibration can be performed on the two sensors at the same time. It eliminates the inaccurate measurement caused by the inconsistent sensitivity of different sensors, and also solves the purification efficiency calculation error caused by the time-sharing measurement of unstable concentration gas by the sensor.

[0057] For example, the function of the sensor is to convert the gas concentration into a DC voltage. Within the measuring range, the gas concentration and the output voltage can be approximately regarded as a linear relationship. The sensor output voltage is calculated by the following formula: Vout = C × K + V0, where C is the gas concentration, K is the sensitivity coefficient, Vout is the sensor output voltage, and V0 is the zero voltage. The sensor output voltage is collected by ADC, and the gas concentration can be converted by the formula: Since sensors have different sensitivities, they need to be calibrated at the factory. After calibration, the sensor acquisition module saves the sensor's K and V0 parameters, which can complete the voltage-concentration conversion. If the sensor is exposed to highly polluted gases for a long time, it will be contaminated by the gas, resulting in a decrease in sensitivity, and K will change, requiring regular recalibration.

[0058] The automatic calibration system for exhaust gas purification equipment provided in this embodiment comprises a two-choice switch, at least two sensors and a controller, which together constitute the automatic calibration system for exhaust gas purification equipment. By driving the two-choice switch to switch, the first sensor measuring the gas concentration at the outlet of the exhaust gas purification equipment to be calibrated is switched to measure the gas concentration at the inlet of the exhaust gas purification equipment to be calibrated. The second sensor measuring the gas concentration at the inlet of the exhaust gas purification equipment to be calibrated is calibrated by the first sensor, thereby ensuring the sensitivity and accuracy of the sensors measuring the inlet and outlet of the exhaust gas purification equipment to be calibrated, and realizing accurate measurement and calculation of the purification efficiency of the exhaust gas purification equipment, providing direct data support for evaluating the expected life and maintenance cycle of the purification equipment. At the same time, the requirements of low cost are taken into account, and it is easy to popularize and apply.

[0059] In this embodiment, a method for automatic calibration of exhaust gas purification equipment is provided, which can be used in the above-mentioned automatic calibration system of exhaust gas purification equipment. The system includes a two-choice switch, at least two sensors and a controller. Figure 6 is a flow chart of an automatic calibration method for an exhaust gas purification device according to an embodiment of the present invention. Figure 6 As shown, the process includes the following steps:

[0060] Step S601, at a first preset time interval, driving a first sensor to measure the outlet gas concentration at the outlet gas sampling tube of the exhaust gas purification device to be calibrated, and driving a second sensor to measure the second inlet gas concentration at the inlet gas sampling tube of the exhaust gas purification device to be calibrated.

[0061] Step S602, after a second preset time period, driving the two-to-one switch to switch from connecting the first movable end with the first sensor to connecting the second movable end with the first sensor, so that the first sensor collects the first inlet gas concentration at the inlet gas sampling tube of the exhaust gas purification device to be calibrated.

[0062] Step S603: calibrate the second sensor based on the first inlet gas concentration and the second inlet gas concentration until the first inlet gas concentration is the same as the second inlet gas concentration.

[0063] In an optional embodiment, the method also includes: determining whether the second inlet gas concentration reaches a preset threshold value; when the second inlet gas concentration reaches the preset threshold value, driving the two-to-one switch to switch from the first moving end being connected to the first sensor to the second moving end being connected to the first sensor.

[0064] In this method, since the sensor will produce a relatively large deviation in measurement when the inlet gas concentration of the exhaust gas purification equipment to be calibrated is too low, it is meaningless to calibrate when the concentration is too low. Therefore, calibration is performed after the gas concentration reaches the preset threshold value, which reduces the occurrence of inaccurate calibration and further improves the measurement accuracy of the automatic calibration system of the exhaust gas purification equipment.

[0065] In an optional embodiment, the second sensor is calibrated based on the first inlet gas concentration and the second inlet gas concentration, including: calculating a first proportional coefficient of the first sensor and a second proportional coefficient of the second sensor based on the first inlet gas concentration and the second inlet gas concentration; and modifying the second proportional coefficient of the second sensor based on the first proportional coefficient and the second proportional coefficient until the first inlet gas concentration is the same as the second inlet gas concentration.

[0066] In this method, since the sensor arranged at the outlet of the exhaust gas purification equipment is less polluted and has a more stable working state, the proportional coefficient of the first sensor arranged at the outlet is used to calibrate the second sensor arranged at the inlet to improve the measurement accuracy of the second sensor, thereby further realizing accurate measurement and calculation of the purification efficiency of the exhaust gas purification equipment.

[0067] In one implementation scenario, the purification efficiency of the exhaust gas purification equipment is calculated by the following formula:

[0068]

[0069] Where: η is the purification efficiency of the treatment system, in %; C 进 VOCs concentration at the inlet of the treatment system, in mg / m 3 ; C 出 VOCs concentration at the outlet of the treatment system, in mg / m 3 ;Q 进 is the gas flow rate at the inlet of the processing system, in m 3 / h;Q 出 is the gas flow rate at the outlet of the processing system, in m 3 / h.

[0070] When the inlet and outlet gas flow rates are the same, equation (1) can be simplified to:

[0071]

[0072] To measure the purification efficiency of the purification equipment, it is necessary to use detection equipment to measure the VOCs concentration at the exhaust gas inlet and the treated exhaust gas outlet of the equipment respectively. Due to the difference in sensitivity of the sensor, it needs to be calibrated at the factory. If it is exposed to highly polluted gases for a long time, the sensor will be contaminated by the gas, resulting in a decrease in sensitivity. K will change. Therefore, it needs to be recalibrated regularly. The theoretical basis of the automatic calibration method of the exhaust gas purification equipment includes: After the initial calibration, the measurement accuracy of the sensor can be guaranteed. At this time, the purification efficiency of the exhaust gas purification equipment can be measured and converted according to formula (2):

[0073] After the sensor has been working for a period of time, its sensitivity decreases from K to K1. According to formula (2), for the same gas concentration, the output voltage Vout decreases. The AD circuit uses the original parameter K to convert the gas concentration C, which also decreases. The sensitivity of the two sensors decreases to different degrees, so the converted C 出 and C 进 Inaccurate, resulting in inaccurate calculation of purification efficiency. By passing the same concentration of gas into the two sensors, it is known that C 出 =C 进 The sensor acquisition module can calibrate the sensitivity parameters of the two sensors. Although the absolute value of the gas concentration may not be accurate, the ratio of the two is accurate, so the purification efficiency of the exhaust gas purification equipment can be truly converted.

[0074] Specifically, Figure 7 FIG. 1 is a flow chart of an automatic calibration method for a VOCs waste gas purification device according to an embodiment of the present invention. Figure 7 As shown, the automatic calibration method of VOCs waste gas purification equipment includes:

[0075] 1. Start the measurement at a fixed time, and two sensors measure the gas concentration at the inlet and outlet of the exhaust gas purification device 400 respectively.

[0076] 2. If the inlet concentration reaches the set threshold, the calibration process begins.

[0077] 3. Both pipelines are switched to allow inlet gas to flow in, and the inlet VOCs concentration of the exhaust gas purification equipment is detected at the same time. The inlet second sensor 220 is calibrated based on the detection value of the outlet first sensor 210.

[0078] 4. The calibration parameters of the two sensors are saved in the controller.

[0079] 5. Calibration completed.

[0080] When multiple sensors (such as no less than 3 sensors) are configured in the system, the sensor for detecting outlet VOCs is also used as a reference to automatically calibrate other sensors, and the calibration method is the same as the above method.

[0081] The automatic calibration method for exhaust gas purification equipment provided in this embodiment uses the exhaust gas purification equipment automatic calibration system to calibrate the second sensor for measuring the gas concentration at the air inlet of the exhaust gas purification equipment to be calibrated using the first sensor, thereby ensuring the sensitivity and accuracy of the sensors for measuring the air inlet and air outlet of the exhaust gas purification equipment to be calibrated, and accurately measuring and calculating the purification efficiency of the exhaust gas purification equipment, providing direct data support for evaluating the expected life and maintenance cycle of the purification equipment. At the same time, it takes into account the requirements of low cost and is easy to popularize and apply.

[0082] The embodiment of the present invention also provides a hardware device for executing the above Figure 6 The automatic calibration method of the exhaust gas purification equipment is shown.

[0083] See also Figure 8 , Figure 8 is a schematic diagram of a hardware device provided by an optional embodiment of the present invention, such as Figure 8 As shown, the hardware device includes: one or more processors 10, memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the hardware device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple hardware devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 8 A processor 10 is taken as an example.

[0084] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0085] The memory 20 stores instructions executable by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiment.

[0086] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required by at least one function; the data storage area may store data created according to the use of the hardware device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the hardware device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0087] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0088] The hardware device also includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30 and the output device 40 may be connected via a bus or other means. Figure 8 The example of connecting through bus is taken in the following.

[0089] The input device 30 can receive input digital or character information, and generate key signal input related to the user settings and function control of the hardware device, such as a touch screen, a keypad, a mouse, a track pad, a touch pad, an indicator bar, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 may include a display device, an auxiliary lighting device (e.g., an LED) and a tactile feedback device (e.g., a vibration motor), etc. The above-mentioned display device includes but is not limited to a liquid crystal display, a light emitting diode, a display and a plasma display. In some optional embodiments, the display device can be a touch screen.

[0090] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0091] A part of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of the computer program instruction in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc., and accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0092] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An automatic calibration system for exhaust gas purification equipment, characterized in that: The system includes a two-choice switch, at least two sensors and a controller: The first movable end of the two-choice switch is connected to the outlet gas sampling tube of the exhaust gas purification device to be calibrated, the second movable end of the two-choice switch is connected to the inlet gas sampling tube of the exhaust gas purification device to be calibrated, and the fixed end of the two-choice switch is connected to the first sensor; The second sensor is connected to the inlet gas sampling tube of the exhaust gas purification device to be calibrated, and is used to collect the second inlet gas concentration at the inlet gas sampling tube of the exhaust gas purification device to be calibrated; The controller is connected to the two-select-one switch, the first sensor and the second sensor, and is used to drive the two-select-one switch to switch from the first movable end being connected to the first sensor to the second movable end being connected to the first sensor at an interval of a second preset time period, so that the first sensor collects the first inlet gas concentration at the inlet gas sampling tube of the exhaust gas purification equipment to be calibrated, and calibrates the second sensor based on the first inlet gas concentration and the second inlet gas concentration until the first inlet gas concentration is the same as the second inlet gas concentration.

2. The system according to claim 1, characterized in that The controller is also used to drive the first sensor to measure the outlet gas concentration at the outlet gas sampling pipe of the exhaust gas purification device to be calibrated at intervals of a first preset time period, and drive the second sensor to measure the second inlet gas concentration at the inlet gas sampling pipe of the exhaust gas purification device to be calibrated.

3. The system according to claim 2, characterized in that The controller is also used to determine whether the concentration of the second inlet gas reaches a preset threshold value. When the concentration of the second inlet gas reaches the preset threshold value, the controller drives the two-select-one switch to switch from the first moving end being connected to the first sensor to the second moving end being connected to the first sensor.

4. The system according to claim 1, characterized in that The controller calibrates the second sensor based on the first inlet gas concentration and the second inlet gas concentration, comprising: Based on the first inlet gas concentration and the second inlet gas concentration, a first proportional coefficient of the first sensor and a second proportional coefficient of the second sensor are calculated, and based on the first proportional coefficient and the second proportional coefficient, the second proportional coefficient of the second sensor is modified until the first inlet gas concentration is the same as the second inlet gas concentration.

5. A method for automatic calibration of exhaust gas purification equipment, characterized in that: Applicable to the automatic calibration system for exhaust gas purification equipment according to any one of claims 1 to 4, the system comprises a two-choice switch, at least two sensors and a controller, and the method comprises: At intervals of a first preset time period, driving the first sensor to measure the outlet gas concentration at the outlet gas sampling pipe of the exhaust gas purification device to be calibrated, and driving the second sensor to measure the second inlet gas concentration at the inlet gas sampling pipe of the exhaust gas purification device to be calibrated; At intervals of a second preset time period, driving the two-to-one switch to switch from the first movable end being connected to the first sensor to the second movable end being connected to the first sensor, so that the first sensor collects a first inlet gas concentration at the inlet gas sampling tube of the exhaust gas purification device to be calibrated; The second sensor is calibrated based on the first inlet gas concentration and the second inlet gas concentration until the first inlet gas concentration is the same as the second inlet gas concentration.

6. The method according to claim 5, characterized in that The method further comprises: Determining whether the concentration of the second inlet gas reaches a preset threshold value; When the concentration of the second inlet gas reaches the preset threshold value, the two-select-one switch is driven to switch from the first movable end being connected to the first sensor to the second movable end being connected to the first sensor.

7. The method according to claim 5, characterized in that The calibrating the second sensor based on the first inlet gas concentration and the second inlet gas concentration includes: Based on the first inlet gas concentration and the second inlet gas concentration, calculating a first proportionality coefficient of the first sensor and a second proportionality coefficient of the second sensor; Based on the first proportionality coefficient and the second proportionality coefficient, the second proportionality coefficient of the second sensor is modified until the first inlet gas concentration is the same as the second inlet gas concentration.

8. A hardware device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the automatic calibration method for exhaust gas purification equipment according to any one of claims 5 to 7 by executing the computer instructions.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the automatic calibration method for exhaust gas purification equipment according to any one of claims 5 to 7.

10. A computer program product, characterized in that The method comprises computer instructions for causing a computer to execute the automatic calibration method for an exhaust gas purification device according to any one of claims 5 to 7.

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