Compensation method for offset of carbon monoxide catalytic element of mining multi-parameter sensor influenced by interference gas

Abstract

The invention relates to a compensation method for offset of a carbon monoxide catalytic element of a mining multi-parameter sensor influenced by interference gas, and belongs to the technical field of sensors. The method comprises the following steps: S1, introducing ethylene gas into a multi-parameter sensor, and collecting a data sample; s2, constructing a carbon monoxide element ethylene gas interference amount compensation model by using a least square method nonlinear regression equation; s3, acetylene gas is introduced into the multi-parameter sensor, and a data sample is collected; s4, constructing a composite disturbance variable model of acetylene and ethylene mixed gas on the carbon monoxide element; and S5, subtracting the carbon monoxide concentration value calculated by the acetylene and ethylene mixed gas composite disturbance variable model in the step S4 from a real-time measured value sent to the mainboard from the carbon monoxide element to obtain a compensated carbon monoxide concentration value. According to the invention, the anti-interference performance of the multi-parameter sensor when the multi-parameter sensor monitors various gases at the same time can be improved, and the monitoring accuracy is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of sensors and relates to a method for compensating an offset of a carbon monoxide catalytic element of a multi-parameter sensor for a mine affected by an interfering gas. Background Art

[0002] The mining multi-parameter sensor (referred to as the sensor) is a concentration monitoring device that contains methane, oxygen, ethylene, acetylene, carbon monoxide, carbon dioxide and other gases. It is often used in goaf areas to monitor fire disasters. The carbon monoxide element based on the catalytic principle in the sensor will be interfered by ethylene and acetylene gases. When ethylene and acetylene gases appear in the environment monitored by the sensor, the carbon monoxide catalytic element will be "poisoned" (the monitored gas concentration value output by the element deviates seriously from the actual value). The reason is that the catalyst in the carbon monoxide catalytic element reacts with ethylene and acetylene gas to generate heat, which affects the change of the measuring bridge. This will cause the sensor to output incorrect carbon monoxide concentration measurement values, seriously affecting the reliability and stability of the product. The same problem will occur on the ethylene catalytic element. When acetylene gas appears in the environment monitored by the sensor, the ethylene catalytic element will also experience the above-mentioned "poisoning" phenomenon.

[0003] Therefore, there is an urgent need for a method that can improve the reliability and anti-interference performance of a multi-parameter gas sensor containing a carbon monoxide catalytic element to solve the above problems. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a method for compensating the offset of the carbon monoxide catalytic element of a multi-parameter sensor for mining affected by interfering gas, so as to solve the problem that when ethylene or acetylene gas appears in the surrounding environment of the multi-parameter sensor, the carbon monoxide gas concentration value monitored by the carbon monoxide catalytic element seriously deviates from the actual value, and to improve the reliability and anti-interference of the multi-parameter gas sensor containing the carbon monoxide catalytic element.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A method for compensating the offset of a carbon monoxide catalytic element of a multi-parameter sensor for mining affected by interference gas specifically comprises the following steps:

[0007] S1: introducing ethylene gas into the multi-parameter sensor to collect real-time measurement data samples of carbon monoxide and ethylene in the sensor;

[0008] S2: Using the least squares nonlinear regression equation to build a compensation model for the amount of ethylene gas interference on the carbon monoxide element;

[0009] S3: introducing acetylene gas into the multi-parameter sensor to collect real-time measurement value data samples of carbon monoxide, ethylene and acetylene in the sensor;

[0010] S4: Calculate the composite interference model of acetylene and ethylene mixed gas on the carbon monoxide element;

[0011] S5: Subtract the real-time measurement value sent from the carbon monoxide element to the main board from the carbon monoxide concentration value calculated by the composite interference quantity model in step S4, so as to obtain the compensated carbon monoxide concentration value.

[0012] Further, in step S2, the expression of the compensation model of the carbon monoxide element affected by the ethylene gas interference is constructed as follows:

[0013] f(x1)=a 0+ a1×x1+a2×x1 2 +a3×x1 3

[0014] Among them, f(x1) represents the gas concentration measurement value sent by the carbon monoxide element to the main board when there is only ethylene gas in the environment; a0, a1, a2, and a3 are constant values ​​respectively; x1 represents the gas concentration measurement value sent by the ethylene element to the main board when there is only ethylene gas in the environment.

[0015] Furthermore, in step S2, according to the multiple groups of carbon monoxide concentration measurement values ​​and ethylene concentration measurement values ​​collected in step S1, fitting is performed through tool software to solve the values ​​of coefficients a0, a1, a2, and a3.

[0016] Further, in step S4, the expression of the constructed acetylene and ethylene gas composite interference quantity model is:

[0017] β=f(x1)+b 0+ b1×x2+b2×x2 2 +b3×x2 3

[0018] Among them, x2 represents the concentration measurement value sent by the acetylene component to the main board, and β represents the concentration measurement value sent by the carbon monoxide component to the main board.

[0019] Further, in step S4, according to the concentration measurement values ​​sent by the multiple groups of carbon monoxide components to the main board, the concentration measurement values ​​sent by the ethylene components to the main board, and the concentration measurement values ​​sent by the acetylene components to the main board collected in step S3, the tool software is used to fit and solve the coefficient b 0、 b 1、 b 2、 The value of b3.

[0020] Further, in step S5, the calculation formula of the carbon monoxide concentration value v displayed in real time by the multi-parameter sensor is:

[0021] v=θ-H

[0022] Wherein, θ represents the real-time measurement value sent to the main board from the carbon monoxide element; H represents the compensation value of the carbon monoxide gas concentration value calculated in real time by step S4 when the multi-parameter sensor works normally in the coal mine, and the expression is:

[0023] H=f(x1)+b 0+ b1×x2+b2×x2 2 +b3×x2 3 .

[0024] The beneficial effects of the present invention are:

[0025] (1) In the prior art, when a multi-parameter sensor containing a carbon monoxide catalytic element detects the presence of ethylene and acetylene gases in the environment, the display error is large, which seriously deviates from the actual carbon monoxide concentration value. After using the method of the present invention, the carbon monoxide catalytic element in the multi-parameter sensor will have a strong ability to resist the interference of ethylene and acetylene gases, and the sensor will display the correct carbon monoxide concentration value in the environment.

[0026] (2) The method of the present invention can improve the anti-interference performance of the multi-parameter sensor when it monitors multiple gases at the same time, thereby improving the monitoring accuracy.

[0027] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0029] Figure 1 This is the mainboard architecture diagram of the multi-parameter sensor;

[0030] Figure 2 The present invention is a flow chart for compensating the output value of the carbon monoxide catalytic element when it is disturbed by ethylene and acetylene gas. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0032] See also Figure 1-2 After the carbon monoxide and ethylene catalytic elements are "poisoned", the sensor mainboard will display the failed monitoring gas concentration value. In order to ensure the reliability of the sensor, the original carbon monoxide measurement value must be compensated, and then the compensated value is sent to the sensor mainboard for display. The mainboard architecture diagram is as follows Figure 1 The embodiment of the present invention proposes a method of using a least squares nonlinear regression model to solve the compensation problem of the carbon monoxide catalytic element.

[0033] The carbon monoxide catalytic element is affected by ethylene and acetylene gases and will output erroneous measurement values ​​to the main board. The ethylene catalytic element is affected by acetylene gas and will output erroneous measurement values ​​to the main board.

[0034] When there is only ethylene gas in the environment, the equation of least squares nonlinear regression is as follows:

[0035] y=a0 + a1×x1+ a2×x1 2 +a3×x1 3 (1)

[0036] Among them, y represents the gas concentration measurement value sent by the carbon monoxide element to the main board, a0, a1, a2, and a3 are constant values, and x1 represents the gas concentration measurement value sent by the ethylene element to the main board.

[0037] Ethylene gas with a concentration of 150ppm is passed to the multi-parameter sensor, and the concentration values ​​sent by the ethylene element and the carbon monoxide element to the main board are recorded as shown in Table 1 below:

[0038] Table 1 Ethylene Carbon Monoxide Data Record Table

[0039]

[0040]

[0041] Collect 20 sets of data from Table 1, fit them using the tool software, and solve for the values ​​of coefficients a0, a1, a2, and a3. Let y = f(x1), then:

[0042] f(x1) = a0 + a1×x1+ a2×x1 2 + a3×x1 3 (3)

[0043] The multi-parameter sensor is fed with ethylene gas with a concentration of 75ppm, and the concentration values ​​sent by the acetylene component, ethylene component, and carbon monoxide component to the main board are recorded as shown in Table 2 below:

[0044] Table 2 Ethylene Carbon Monoxide Acetylene Data Record Table

[0045]

[0046]

[0047] When acetylene gas is passed, both the ethylene catalytic element and the carbon monoxide catalytic element will output incorrect measurement values ​​to the main board. The accumulated amount of interference caused to the carbon monoxide element can be decomposed into the accumulated amount caused by acetylene gas and the accumulated amount caused by ethylene gas. The accumulated amount of carbon monoxide caused by the interference of ethylene gas is regarded as y, the accumulated amount caused by the interference of ethylene gas is regarded as z, and the total accumulated amount is regarded as β, then:

[0048] β = y + z (3)

[0049] Then the equation for z using the least squares nonlinear regression method is as follows:

[0050] z = b0 + b1×x2+ b2×x2 2 + b3×x2 3 (4)

[0051] Since y = f(x1), substituting (4) into (3) yields:

[0052] β = f(x1) + b0 + b1×x2+ b2×x2 2 + b3×x2 3 (5)

[0053] From Table 2, we can see that x1 represents the measured concentration value sent by the ethylene element to the main board, x2 represents the measured concentration value sent by the acetylene element to the main board, and β represents the measured concentration value sent by the carbon monoxide element to the main board. Collect 20 sets of data from Table 2, fit them through the tool software, and solve the coefficient b 0、 b 1、 b 2、b3 value. Since the actual concentration value of the current carbon monoxide environment is 0, β is the value that should be compensated during the operation of the carbon monoxide element. The real-time carbon monoxide concentration value v displayed by the multi-parameter sensor should be expressed as follows:

[0054] v = θ - H (6)

[0055] Wherein, θ represents the real-time measurement value sent to the main board by the carbon monoxide element; H represents the carbon monoxide gas concentration compensation value calculated in real time by formula (5) when the multi-parameter sensor works normally in the coal mine, that is, H = f(x1) + b 0+ b1×x2+b2×x2 2 +b3×x2 3 The model is constructed as follows Figure 2 shown.

[0056] The laser ethylene element will not be disturbed by acetylene gas and has strong anti-interference ability. If a multi-parameter sensor adopts a laser ethylene element, the concentration measurement value sent to the main board by the ethylene element in Table 2 is 0. The model construction method of the present invention is also applicable to the case where the multi-parameter sensor includes a laser ethylene element.

[0057] The above model (6) is built into the sensor microcontroller, so that the output of the carbon monoxide catalytic element can be compensated in real time to ensure that the sensor output displays a stable carbon monoxide concentration value.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A method for compensating the offset of a carbon monoxide catalytic element of a multi-parameter sensor for mining affected by interference gas, characterized in that: The method specifically comprises the following steps: S1: introducing ethylene gas into the multi-parameter sensor to collect real-time measurement data samples of carbon monoxide and ethylene in the sensor; S2: Using the least squares nonlinear regression equation to build a compensation model for the amount of ethylene gas interference on the carbon monoxide element; S3: introducing acetylene gas into the multi-parameter sensor to collect real-time measurement value data samples of carbon monoxide, ethylene and acetylene in the sensor; S4: Calculate the composite interference model of acetylene and ethylene mixed gas on the carbon monoxide element; S5: Subtract the real-time measurement value sent from the carbon monoxide element to the main board from the carbon monoxide concentration value calculated by the composite interference quantity model in step S4, so as to obtain the compensated carbon monoxide concentration value.

2. The method for compensating the offset of the carbon monoxide catalytic element of the multi-parameter sensor for mining affected by the interference gas according to claim 1 is characterized in that: In step S2, the expression of the compensation model of the carbon monoxide element affected by ethylene gas interference is constructed as follows: f(x1)=a 0+ a1×x1+a2×x1 2 +a3×x1 3 Among them, f(x1) represents the gas concentration measurement value sent by the carbon monoxide element to the main board when there is only ethylene gas in the environment; a0, a1, a2, and a3 are constant values ​​respectively; x1 represents the gas concentration measurement value sent by the ethylene element to the main board when there is only ethylene gas in the environment.

3. The method for compensating the offset of the carbon monoxide catalytic element of the multi-parameter sensor for mining affected by the interference gas according to claim 2 is characterized in that: In step S2, according to the multiple groups of carbon monoxide concentration measurement values ​​and ethylene concentration measurement values ​​collected in step S1, fitting is performed through tool software to solve the values ​​of coefficients a0, a1, a2, and a3.

4. The method for compensating the offset of the carbon monoxide catalytic element of the multi-parameter sensor for mining affected by the interference gas according to claim 2 is characterized in that: In step S4, the expression of the composite interference quantity model of acetylene and ethylene mixed gas is constructed as follows: β=f(x1)+b 0+ b1×x2+b2×x2 2 +b3×x2 3 Among them, x2 represents the concentration measurement value sent by the acetylene component to the main board, and β represents the concentration measurement value sent by the carbon monoxide component to the main board.

5. The method for compensating the offset of the carbon monoxide catalytic element of the multi-parameter sensor for mining affected by the interference gas according to claim 4 is characterized in that: In step S4, the coefficient b is solved by fitting through tool software according to the concentration measurement values ​​sent to the main board by the multiple groups of carbon monoxide components, the concentration measurement values ​​sent to the main board by the ethylene components and the concentration measurement values ​​sent to the main board by the acetylene components collected in step S3. 0、 b 1、 b 2、 The value of b3.

6. The method for compensating the offset of the carbon monoxide catalytic element of the multi-parameter sensor for mining affected by the interference gas according to claim 4 is characterized in that: In step S5, the calculation formula of the carbon monoxide concentration value v displayed in real time by the multi-parameter sensor is: v=θ-H Wherein, θ represents the real-time measurement value sent to the main board from the carbon monoxide element; H represents the compensation value of the carbon monoxide gas concentration value calculated in real time by step S4 when the multi-parameter sensor works normally in the coal mine, and the expression is: H=f(x1)+b 0+ b1×x2+b2×x2 2 +b3×x2 3 。

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