A method for detecting residual protection capability of carbon layer based on built-in multi-probe

Abstract

The application discloses a kind of carbon layer residual protection capability detection method and system based on built-in multi-probe, which comprises the following steps: step 1, insert multiple gas sensing units into carbon layer according to preset interval, set model parameters and read the gas concentration detection signal of each sensing unit in real time, according to the detection signal of each position sensing unit, the penetration curve equation is obtained by real-time fitting;Step 2: calculate the harmful gas penetration depth according to the penetration curve equation;Step 3: calculate the residual protection capability of carbon layer according to the penetration depth;The application can calculate the real-time concentration distribution of harmful gas in carbon layer based on the gas concentration signal provided by a limited number of gas sensing units in built-in carbon layer, thereby providing effective information about the residual protection capability of carbon layer in real time, avoiding the over-conservative estimate leading to premature replacement of carbon layer, and achieving the balance of safety and efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gas detection, and particularly relates to a carbon layer residual protection capability detection method and system based on a built-in multi-probe. BACKGROUND

[0002] Whether individual protection or collective protection, it is necessary to rely on a filtering system to block harmful gases from the outside world and to deliver clean air for the protection of personnel. However, the residual protection time of the carbon layer in the filtering system is often difficult to estimate due to its early use state, on-site use temperature and humidity, and other reasons. If the protection failure time cannot be effectively evaluated, harmful gases will break through the protection barrier, which will lead to serious consequences. However, since the penetration state of the carbon layer is disturbed by environmental conditions, harmful gas types and concentrations, there is no specific equation or model that can simply describe it. Therefore, the evaluation of the residual protection capability of the carbon layer is mainly carried out when it is about to penetrate or fail, and it is not possible to accurately display the residual protection capability of the carbon layer in real time. The degree of informatization is not high, which makes it difficult to protect the personal safety of personnel and easily increases the mental burden of personnel.

[0003] In view of the problems existing in the prior art, it is necessary to develop a reliable failure warning model based on existing protection failure indication technology, to collect and analyze real-time data of the carbon layer, to indicate the residual protection capability in real time within the allowable range of accuracy, and to provide a scientific basis for decision-making such as regular inspection and maintenance. SUMMARY

[0004] The present application provides a carbon layer residual protection capability detection method and system based on a built-in multi-probe, which can realize real-time calculation of the residual protection capability of the carbon layer based on harmful gas concentration signals obtained in real time by a plurality of sensing units built into the carbon layer, to solve the problems existing in the prior art.

[0005] To solve the above problems, the technical scheme provided by the present application is as follows:

[0006] The present application provides a carbon layer residual protection capability detection method based on a built-in multi-probe, which comprises:

[0007] Step 1, insert a plurality of gas sensing units into the carbon layer according to a preset interval, set model parameters and read the gas concentration detection signals of each sensing unit in real time, and according to the detection signals of the sensing units at each position, obtain a penetration curve equation in real time, which is: Wherein, z is the depth of the carbon layer, and σ(z) is the harmful gas concentration percentage C z / C0, C zC0 is the concentration of harmful gas in the environment; a is a constant; s is the horizontal coordinate of the symmetric center point of the real-time concentration distribution curve at which the percentage of harmful gas concentration is 50%; the penetration curve equation is used to describe the change of the real-time harmful gas concentration with the carbon layer depth;

[0008] Step 2: Calculate the harmful gas penetration depth according to the penetration curve equation, the harmful gas penetration depth is the carbon layer depth corresponding to the minimum pre-warning concentration of the harmful gas concentration in the carbon layer;

[0009] Step 3: Calculate the remaining protection capability of the carbon layer according to the penetration depth, the remaining protection capability is the ratio of the real-time effective thickness of the carbon layer to the total effective thickness of the carbon layer, and the calculation formula of the remaining protection capability is as follows:

[0010] The real-time effective thickness of the carbon layer is the difference between the total thickness L0 of the carbon layer and the harmful gas penetration depth L b ; since the carbon layer is considered to be invalid when the harmful gas concentration at the tail end of the carbon layer reaches the pre-warning value, at this time, a part of the carbon layer at the tail end is not saturated, which is equivalent to the unused carbon layer thickness, that is, the ineffective thickness h0, and the total effective thickness of the carbon layer is the difference between the total thickness L0 of the carbon layer and the ineffective thickness h0.

[0011] In an optional embodiment of the present application, step 1 specifically comprises: step 11, inserting n gas sensing units into the carbon layer at a preset interval; step 12, reading the gas concentration signals C1-C n at each position in the carbon layer in real time; step 13, setting the value of the fitting curve parameter a, which is determined through a limited number of experiments; step 14, setting the value range of the fitting curve center point s, the value range of the fitting curve center point s should be not less than the actual carbon layer thickness; step 15, searching the value range of s at a predetermined interval, and combining the real-time gas concentration signals to obtain a plurality of fitting curves; step 16, substituting the carbon layer depth of the sensing unit into these fitting curves to obtain a plurality of fitting concentration values, and calculating the variance between the actual concentration value and each group of fitting concentration values; step 17, determining the s value with the minimum variance as the center point of the fitting curve at this moment, and obtaining the penetration curve equation with the best fitting effect.

[0012] In an optional embodiment of the present application, the number of inserted gas sensing units in step 11 should be not less than 1, and the harmful gas types detected by the gas sensing unit include but are not limited to benzene series, hydrogen sulfide, ammonia, formaldehyde, chlorine, nitrogen oxide, sulfur dioxide and hydrogen cyanide; the gas sensing unit has ppt-level, ppb-level and ppm-level harmful gas concentration detection capability.

[0013] In an optional embodiment of the present application, step 2 specifically comprises: bringing the minimum warning concentration σ(b) into the penetration equation to obtain the penetration depth L of the harmful gas b : wherein the minimum warning concentration σ(b) is not less than the signal fluctuation value of the gas sensing unit and not greater than the minimum harmful dose of the harmful gas to the human body.

[0014] The embodiment of the present application provides a carbon layer residual protection capability detection system based on a built-in multi-probe, which comprises an acquisition penetration curve equation module, a harmful gas penetration depth calculation module and a carbon layer residual protection capability calculation module.

[0015] The acquisition penetration curve equation module is used for inserting a plurality of gas sensing units into the carbon layer at a preset interval, setting model parameters and reading the gas concentration detection signals of each sensing unit in real time, and fitting the penetration curve equation in real time according to the detection signals of the sensing units at different positions.

[0016] The penetration curve equation is as follows: wherein z is the carbon layer depth, σ(z) is the harmful gas concentration percentage C z / C0 at the z position, C z is the harmful gas concentration at the z position, C0 is the harmful gas concentration in the environment, a is a constant, s is the carbon layer depth at which the harmful gas concentration percentage is 50%, and x0 is the horizontal coordinate of the symmetric center point of the real-time concentration distribution curve.

[0017] The harmful gas penetration depth calculation module calculates the harmful gas penetration depth according to the penetration curve equation.

[0018] The carbon layer residual protection capability calculation module calculates the residual protection capability of the carbon layer according to the penetration depth, and the calculation formula of the residual protection capability is as follows: wherein the real-time effective thickness of the carbon layer is the difference between the total thickness L0 of the carbon layer and the harmful gas penetration depth L b . Since the carbon layer is considered to be invalid when the harmful gas concentration at the tail end of the carbon layer reaches the warning value, a part of the carbon layer at the tail end is not saturated at this time, and the part is equivalent to the unused carbon layer thickness, that is, the ineffective thickness h0. The total effective thickness of the carbon layer is the difference between the total thickness L0 of the carbon layer and the ineffective thickness h0.

[0019] In an optional embodiment of the present application, the penetration equation of the harmful gas penetration depth calculation module is as follows:

[0020] wherein L b is the penetration depth of the harmful gas, and the minimum warning concentration σ(b) is not less than the signal fluctuation value of the gas sensing unit and not greater than the minimum harmful dose of the harmful gas to the human body.

[0021] The embodiment of the present application also provides a computer readable storage medium, which stores a computer program, wherein the computer program is executed by a processor to realize the steps of the method for detecting residual protection capability of a carbon layer based on a built-in multi-probe.

[0022] Compared with the prior art, the embodiment of the present application provides a method and system for detecting residual protection capability of a carbon layer based on a built-in multi-probe, which has the following beneficial effects: the present application can calculate the real-time concentration distribution of harmful gas in the carbon layer based on the gas concentration signals provided by the gas sensing units in the limited built-in carbon layer, thereby providing effective information about the residual protection capability of the carbon layer in real time; the method can avoid the over-conservative estimation leading to the premature replacement of the carbon layer by ensuring the real-time detection of the carbon layer failure, and realizes the balance between safety and efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0024] Figure 1 A flowchart of the method for detecting residual protection capability of a carbon layer based on a built-in multi-probe is provided for the embodiment of the present application.

[0025] Figure 2 A test platform schematic diagram of the method for detecting residual protection capability of a carbon layer based on a built-in multi-probe is provided for the embodiment of the present application.

[0026] Figure 3 A harmful gas concentration distribution curve with carbon layer depth obtained by fitting the harmful gas concentration measured by the built-in sensing unit is provided for the embodiment of the present application.

[0027] Figure 4 A comparison result schematic diagram of the predicted residual protection capability and the actual residual protection capability is provided for the embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] This invention provides a method for detecting residual protective capability of carbon layers based on built-in multi-probes, including:

[0030] Step 1: Insert multiple gas sensing units into the carbon layer at preset intervals, set model parameters, and read the gas concentration detection signals of each sensing unit in real time. Based on the detection signals of the sensing units at each location, fit the transmission curve equation in real time. The transmission curve equation is: Where z is the carbon layer depth, and σ(z) is the percentage of harmful gas concentration C at position z. z / C0,C z Let z be the concentration of harmful gas at position z, C0 be the concentration of harmful gas in the environment, a be a constant, s be the carbon layer depth at which the percentage of harmful gas concentration is 50%, and y be the abscissa of the center point of the real-time concentration distribution curve. The breakthrough curve equation is used to describe the change of harmful gas concentration with carbon layer depth in real time.

[0031] Step 2: Calculate the penetration depth of harmful gases based on the penetration curve equation. The penetration depth of harmful gases is the carbon layer depth corresponding to the minimum warning concentration of harmful gases in the carbon layer.

[0032] Step 3: Calculate the remaining protective capacity of the carbon layer based on the penetration depth. The remaining protective capacity is the ratio of the real-time effective thickness of the carbon layer to the total effective thickness of the carbon layer. The formula for calculating the remaining protective capacity is as follows:

[0033] The real-time effective thickness of the carbon layer is defined as the total carbon layer thickness L0 and the penetration depth of harmful gases L. b The difference; since the carbon layer is considered to be ineffective when the concentration of harmful gas at the tail end of the carbon layer reaches the warning value, and at this time a part of the carbon layer tail end is not adsorbed and saturated, the unadsorbed and saturated part is equivalent to the unused carbon layer thickness, that is, the ineffective thickness h0. The total effective thickness of the carbon layer is the difference between the total carbon layer thickness L0 and the ineffective thickness h0.

[0034] In this embodiment, based on the penetration curve model, the remaining protective capability of the carbon layer is linearly related to its remaining effective thickness. Therefore, the ratio of the remaining effective thickness of the carbon layer to the total effective thickness can be used as a characteristic value to predict the remaining protective capability of the carbon layer. Since the carbon layer is considered to have failed when the concentration of harmful gases at the tail end reaches the warning value, and a portion of the carbon layer at the tail end is not saturated with adsorption at this time, this portion is equivalent to the unused carbon layer thickness, i.e., the ineffective thickness h0. Therefore, the total effective thickness of the carbon layer is the difference between the total thickness L0 and the dead layer thickness h0; the remaining effective thickness of the carbon layer is the sum of the total thickness L0 and the harmful gas penetration depth L. b The difference.

[0035] like Figure 1As shown, step 1 specifically includes: step 11, inserting n gas sensing units in the carbon layer at a preset interval; the number of gas sensing units inserted in step 11 should be no less than 1, responsible for ensuring the accuracy of the concentration distribution curve fitted based on the concentration signal of the gas sensing unit, and the insertion depth of the carbon layer can be determined by simulation calculation, experience or a limited number of experiments according to the number of gas sensing units to be inserted. The harmful gas species detected by the gas sensing unit includes but is not limited to benzene series, hydrogen sulfide, ammonia, formaldehyde, chlorine, nitrogen oxides, sulfur dioxide and hydrogen cyanide; the gas sensing unit has ppt level, ppb level and ppm level harmful gas concentration detection capability. Step 12, real-time reading of the gas concentration signal C1~C n Step 13, setting the value of the fitting curve parameter a, which is determined by a limited number of experiments.

[0036] Step 14, setting the value range of the fitting curve center point s, the value range of the fitting curve center point s should be no less than the actual thickness of the carbon layer. Step 15, traversing the value range of s at a predetermined interval, and combining the real-time gas concentration signal to obtain a plurality of fitting curves. The number of fitting curves obtained by the embodiment is preferably no less than 100, and the interval of the corresponding traversing s value range should be no more than 1% of the total length of the s value range. Step 16, substituting the carbon layer depth of the sensing unit into these fitting curves to obtain a plurality of fitted concentration values, and calculating the variance between the actual concentration value and each group of fitted concentration values. Step 17, determining the s value with the smallest variance as the center point of the fitting curve at this moment, and obtaining the best penetration curve equation.

[0037] Specifically, the penetration curve equation is obtained by simplifying the Bohart-Adams model, and the derivation process is as follows:

[0038] The rigorous mathematical expression of the Bohart-Adams model is:

[0039]

[0040] Where C0is the concentration of harmful gas in the environment, C is the outlet concentration at time t, L is the carbon layer depth, k is the adsorption dynamic parameter, t is the adsorption time; ρ s is the carbon layer density; ε is the carbon layer porosity; q is the adsorbate concentration on the carbon layer. Among them, the parameters k, ε and v are difficult to obtain in the adsorption process of the fixed adsorption bed, and the void velocity and the superficial velocity (empty tower speed) have the following relationship, that is, u=εv. Let k BA =k·ε, then the parameters in the above formula are converted into easy-to-obtain parameters u and lumped parameter kBA, and the conversion is as follows:

[0041]

[0042] wherein Co is the initial adsorbate concentration; C is the outlet concentration at time t; k BA is the Bohart-Adams model lumped parameter; N0 is the maximum adsorption capacity per unit volume of adsorbent; L is the bed depth; and u is the superficial velocity (empty tower speed). This formula is a linearized logarithmic Bohart-Adams model, also known as the logarithmic formula. Wherein k BA , N0, L and u are constants, let s=k BA C0, the above formula can be simplified as the breakthrough curve equation:

[0043]

[0044] wherein z represents the depth of different carbon layers, and is the independent variable, and sigma(z) is the percentage of toxicant concentration (C Z / C0) at the z position, and C Z is the concentration at the z position, and Co is the environmental concentration. The breakthrough curve equation is mathematically a central symmetric "S" type curve in the range [0, 1], and the symmetric center point is (s, 50%).

[0045] Step 2 specifically comprises: bringing the minimum warning concentration sigma(b) into the penetration equation to obtain the penetration depth L b of the harmful gas: wherein the minimum warning concentration sigma(b) should be not less than the signal fluctuation value of the gas sensing unit, and should be not greater than the minimum harmful dose of the harmful gas to the human body.

[0046] The embodiment of the present application provides a carbon layer residual protection capability detection system based on a built-in multi-probe, comprising an acquisition breakthrough curve equation module, a harmful gas penetration depth calculation module and a carbon layer residual protection capability calculation module;

[0047] The acquisition breakthrough curve equation module is used for inserting a plurality of gas sensing units into the carbon layer according to a preset interval, setting model parameters and reading the gas concentration detection signals of each sensing unit in real time, and fitting the breakthrough curve equation in real time according to the detection signals of the sensing units at each position;

[0048] The breakthrough curve equation is: wherein z is the depth of the carbon layer, and sigma(z) is the percentage of the harmful gas concentration C z / C0 at the z position, and C z is the harmful gas concentration at the z position, and Co is the harmful gas concentration in the environment; a is a constant; s is the depth of the carbon layer at which the percentage of the harmful gas concentration is 50%, and is the horizontal coordinate of the symmetric center point of the real-time concentration distribution curve;

[0049] The module for calculating the penetration depth of harmful gases calculates the penetration depth of harmful gases based on the penetration curve equation; the penetration equation for the module for calculating the penetration depth of harmful gases is: Among them, L b The minimum warning concentration σ(b) is not less than the signal fluctuation value of the gas sensing unit, and at the same time, it is not greater than the minimum harmful dose of the harmful gas to the human body, which is the depth of penetration of the harmful gas.

[0050] The module for calculating the remaining protective capacity of the carbon layer calculates the remaining protective capacity of the carbon layer based on the penetration depth; the formula for calculating the remaining protective capacity is as follows: The real-time effective thickness of the carbon layer is defined as the total carbon layer thickness L0 and the penetration depth of harmful gases L. b The difference; since the carbon layer is considered to be ineffective when the concentration of harmful gas at the tail end of the carbon layer reaches the warning value, and at this time a part of the carbon layer tail end is not adsorbed and saturated, the unadsorbed and saturated part is equivalent to the unused carbon layer thickness, that is, the ineffective thickness h0. The total effective thickness of the carbon layer is the difference between the total carbon layer thickness L0 and the ineffective thickness h0.

[0051] This invention also provides a computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, it implements the steps of a carbon layer residual protection capability detection method based on a built-in multi-probe as described in the above embodiments.

[0052] Example 1

[0053] As an optional implementation method, the following example illustrates the carbon layer residual protection capability detection method based on built-in multi-probes, using the penetration of ethanol gas with a concentration of 5 ppm through a cylindrical carbon layer with a diameter of 25 cm, a length of 50 cm, and a weight of 2 kg.

[0054] The structure of the carbon layer residual protection capability testing equipment used in this embodiment is as follows: Figure 2 As shown, the carbon layer residual protection capability prediction test platform consists of five built-in sensing units, a communication unit, a central processing unit, a data storage unit, and a residual protection capability display unit. The five sensing units are inserted into the carbon layer at depths of 20%, 40%, 60%, 80%, and 100%, respectively. These sensing units convert the concentration of harmful gases at their respective carbon layer depths into electrical signals in real time and transmit them to the central processing unit. The central processing unit collects the signals from the sensing units to identify the types and concentrations of harmful gases, fits the harmful gas concentration distribution curve of the carbon layer, and sends the detection results to the communication unit and the data storage unit. The communication unit sends the detection results to the residual protection capability display unit. The data storage unit stores key information such as the types of harmful gases and the prediction results. Harmful gases enter through the inlet, are filtered by the carbon layer, and are discharged through the outlet.

[0055] The remaining protection capability pre-test experiment process of the carbon layer is as follows:

[0056] Input the determined model parameters: curve parameter a=0.3, pre-warning concentration σ(b)=0.5%, and no-effect thickness h0=5cm, and the value range of parameter s is (-10, 60).

[0057] Start the gas sensing units 1-5, and obtain the harmful gas concentration signals C1-C5 at the carbon layer depths of 20%, 40%, 60%, 80%, and 100% L in real time.

[0058] Through the concentration information of the sensing units 1-5, 700 groups of fitting curves are obtained at intervals of 0.1 in the value range of s.

[0059] The variances of the actual concentration values and the concentration values of each group of fitting curves are calculated, the s value with the minimum variance is determined as the center point of the fitting curve at this moment, and the real-time penetration curve equation with the best fitting effect is obtained. Figure 3 The schematic diagram of the best penetration curve fitting result of the test at 1.5h is shown.

[0060] The penetration depth L of the harmful gas is calculated according to the real-time penetration curve equation. b .

[0061] The remaining protection capability of the carbon layer is calculated according to the penetration depth.

[0062] Figure 4 The corresponding relationship between the model predicted remaining protection capability and the actually measured remaining protection capability of a group of embodiments is shown, when the model remaining protection capability is 9.7%, the actual remaining protection capability is about 14%, and the error is less than 5%. It can be seen that in the full range of the remaining protection capability, the difference between the model predicted remaining protection capability and the actually measured remaining protection capability is very small, which indicates that the carbon layer remaining protection capability detection method with the built-in multi-probe can realize the failure warning and full-range indication of the remaining protection capability of the carbon layer.

[0063] In summary, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, therefore the protection scope of the present application is subject to the range defined by the claims.

Claims

1. A built-in multi-probe-based carbon layer residual protection capability detection method, characterized in that, Comprise: Step 1, insert a plurality of gas sensing units into the carbon layer according to a preset interval, set model parameters and read gas concentration detection signals of each sensing unit in real time, and obtain a breakthrough curve equation in real time according to the detection signals of the sensing units at each position, the breakthrough curve equation being: ; wherein z is the carbon layer depth, C is the harmful gas concentration percentage C0 at the z position z / C0, C z is the harmful gas concentration at the z position, C0 is the harmful gas concentration in the environment; a is a constant; s is the carbon layer depth at which the harmful gas concentration percentage is 50%; and the horizontal coordinate of the symmetric center point of the real-time concentration distribution curve; the breakthrough curve equation is used to describe the change of the real-time harmful gas concentration with the carbon layer depth. Step 2: calculate the harmful gas penetration depth according to the penetration curve equation, the harmful gas penetration depth is the carbon layer depth corresponding to the minimum pre-alarm concentration of the harmful gas concentration in the carbon layer; Step 3: calculate the remaining protection ability of the carbon layer according to the penetration depth, the remaining protection ability is the ratio of the real-time effective thickness of the carbon layer to the total effective thickness of the carbon layer, and the calculation formula of the remaining protection ability is as follows: ; wherein the real-time effective thickness of the carbon layer is the difference between the total thickness L0 of the carbon layer and the penetration depth L of the harmful gas b ; since the carbon layer is considered to be invalid when the harmful gas concentration at the tail end of the carbon layer reaches the pre-warning value, and at this time, there is a part of the carbon layer at the tail end that is not adsorbed and saturated, the part that is not adsorbed and saturated is equivalent to the thickness of the carbon layer that is not utilized, i.e., the ineffective thickness h0, and the total effective thickness of the carbon layer is the difference between the total thickness L0 of the carbon layer and the ineffective thickness h0.

2. The method for detecting the residual protection capability of carbon layer based on built-in multi-probe according to claim 1, characterized in that, The step 1 specifically comprises: step 11, inserting n gas sensing units in the carbon layer according to a preset interval; step 12, reading the gas concentration signals C1~Cn of the probes at different positions in the carbon layer in real time; n ; step 13, setting the value of the fitting curve parameter a, which is determined through a limited number of experiments; step 14, setting the value range of the fitting curve center point s, and the value range of the fitting curve center point s should be not less than the actual thickness of the carbon layer; step 15, searching the value range of s with a predetermined interval, and obtaining a plurality of fitting curves by combining the real-time gas concentration signals; step 16, substituting the carbon layer depth of the sensing unit into the fitting curves to obtain a plurality of fitting concentration values, and calculating the variance between the actual concentration value and each group of fitting concentration values; step 17, determining the s value with the minimum variance as the center point of the fitting curve at this moment, and obtaining the best penetration curve equation.

3. The method according to claim 2, wherein, The number of gas sensing units inserted in step 11 should be not less than 1, and the harmful gas types detected by the gas sensing unit include benzene series, hydrogen sulfide, ammonia, formaldehyde, chlorine, nitrogen oxide, sulfur dioxide and hydrogen cyanide; the gas sensing unit has ppt level, ppb level and ppm level harmful gas concentration detection capability.

4. The method for detecting the residual protection capability of carbon layer based on built-in multi-probe according to claim 1, characterized in that, Step 2 specifically includes setting the minimum warning concentration The penetration depth L of the harmful gas is obtained by introducing the penetration equation b : ; wherein the minimum warning concentration is not less than the signal fluctuation value of the gas sensing unit, and is not greater than the minimum harmful dose of the harmful gas to the human body.

5. A built-in multi-probe based carbon layer residual protection capability detection system, characterized in that, It comprises a penetration curve equation acquisition module, a harmful gas penetration depth calculation module and a carbon layer remaining protection ability calculation module; The penetration curve equation acquisition module is used for inserting a plurality of gas sensing units into the carbon layer at a preset interval, setting model parameters and reading the gas concentration detection signals of each sensing unit in real time, and fitting the penetration curve equation in real time according to the detection signals of the sensing units at each position; The equation for the penetration curve is: Where z is the carbon layer depth, C is the percentage of harmful gas concentration at position z. z / C0,C z Let z be the concentration of harmful gas at position z, C0 be the concentration of harmful gas in the environment, a be a constant, s be the carbon layer depth at which the percentage of harmful gas concentration is 50%, and y be the abscissa of the center point of the real-time concentration distribution curve. The harmful gas penetration depth calculation module calculates the harmful gas penetration depth according to the penetration curve equation, and the harmful gas penetration depth is the carbon layer depth corresponding to the minimum pre-alarm concentration of the harmful gas concentration in the carbon layer; The calculating carbon layer residual protection capability module calculates the residual protection capability of the carbon layer according to the penetration depth; the calculation formula of the residual protection capability is as follows: ; wherein the real-time effective thickness of the carbon layer is the difference between the total thickness L0 of the carbon layer and the penetration depth L of the harmful gas b ; since the carbon layer is considered to be invalid when the harmful gas concentration at the tail end of the carbon layer reaches the early warning value, and at this time, there is a part of the carbon layer at the tail end which is not adsorbed and saturated, the part which is not adsorbed and saturated is equivalent to the thickness of the carbon layer which is not utilized, that is, the ineffective thickness h0, and the total effective thickness of the carbon layer is the difference between the total thickness L0 of the carbon layer and the ineffective thickness h0.

6. The system for detecting residual protection capability of carbon layer based on built-in multi-probe according to claim 5, characterized in that, The penetration equation of the harmful gas penetration depth calculation module is: ; wherein L b penetration depth of the harmful gas, minimum warning concentration not less than the signal fluctuation value of the gas sensing unit, and not greater than the minimum harmful dose of the harmful gas to the human body.

7. A computer-readable storage medium storing a computer program, wherein the computer program comprises the following steps of: The computer program is executed by the processor to realize the steps of the carbon layer remaining protection ability detection method based on the built-in multi-probe according to any one of claims 1 to 4.

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