Method and system for judging explosion risk of combustible gas-nitrogen mixture

Abstract

The invention relates to the technical field of mixture explosion judgment, and discloses a combustible gas-nitrogen mixture explosion risk judgment method and system, and the method comprises the steps: building a hyperbolic model based on the constraint formed by the explosion lower limit and the limit oxygen concentration of explosive gas in a mixture; drawing a corresponding model curve in the rectangular coordinate system by using a function drawing program to form an explosion area classification graph; inputting the two-time mixed data into an explosion area classification map, and judging the explosion risk of the secondary mixture according to the position; if the hyperbolic model judges that explosive exists, an alarm is given out immediately; the data is transmitted to the cloud for real-time calibration; and when the explosive gas mixture data and the cloud data reach a preset similarity value, early warning is given out immediately. The system comprises a hyperbolic model construction module, an explosion attribute judgment module and an explosion early warning module. According to the invention, accurate assessment and rapid response to the explosion risk of the mixed gas are realized, and the method has important safety value.

Description

Technical Field

[0001] The present invention relates to the technical field of mixture explosion judgment, and particularly relates to a method and system for judging the explosion risk of a combustible gas-nitrogen mixture. Background Art

[0002] The explosion limit is a key parameter for judging whether a mixed gas is explosive, usually referring to the lowest and highest concentration ranges in which a combustible gas can explode in air. For a combustible gas-nitrogen mixture, nitrogen, as an inert gas, will dilute the concentration of the combustible gas, thereby reducing its explosiveness. For example, after common combustible gases such as methane and ethylene are mixed with nitrogen, their explosion limits will change, which can be analyzed through experiments and theoretical models.

[0003] Prior Art One, a Chinese patent with the patent number 202411574699.2, relates to an electronic nose system and application for identifying mixed gases based on a sensing array. This electronic nose system consists of three parts: a gas distribution system, a sensing array, and a signal module. The gas distribution system is composed of a dynamic gas mixing device and a gas source; the sensing array consists of multiple sensors; the signal module processes the signals and performs pattern recognition through a host computer development system. The electronic nose system obtains response-recovery curve data, further processes it, and performs pattern recognition to achieve precise identification of low-concentration mixed gases of ethanol, ammonia, and toluene. Although it can accurately identify low-concentration mixed gases of ethanol, ammonia, and toluene and accurately judge the gas concentration, and has potential application prospects in monitoring ethanol, ammonia, and toluene gases in environments such as the atmosphere, chemical plants, and homes; however, the computational complexity is too high, increasing the computational complexity and engineering application concentration.

[0004] Prior Art Two, a Chinese patent with the patent number 202411786309.8 discloses an LPG generator set gas mixing control device, which relates to the technical field of generator set operation control, including: a gas engine, which, with the cooperation of a proportional dynamic response component, realizes precise mixing ratio control, predicts the optimal gas mixing ratio and flow demand under the current working conditions, so that when the propane content in LPG increases, the model predictive controller appropriately reduces the gas intake and increases the air volume to ensure sufficient combustion, can quickly correct the mixing ratio and flow rate, quickly restore the combustion process to stability, ensure the stable operation of the gas engine under different loads, and enable the overall device to form a flow balance and stable operation. Under different gas sources and LPG composition differences, it can accurately judge the effective components actually participating in combustion, and thus accurately calculate the required gas and air volumes. Although it realizes precise mixing ratio control and, with the cooperation of an adjustment control component, realizes precise control of the gas mixing process; however, the handling of the diversity of mixed gas components is insufficient, resulting in a decline in the prediction ability for more complex mixed gases.

[0005] Prior Art Three, a Chinese patent with the patent number 202411767132.7, relates to the technical field of hydrogen engines. Specifically, it discloses a method, device, and system for controlling the hydrogen concentration in the crankcase pipeline of a hydrogen engine. The method includes: obtaining the hydrogen concentration in the crankcase ventilation pipeline, the flow rate of the mixed gas in the crankcase ventilation pipeline, and the air flow rate at the front end of the intake manifold in the current cycle, and then calculating the hydrogen concentration at the rear end of the intake manifold in the current cycle; comparing the hydrogen concentration at the rear end of the intake manifold in the current cycle with the hydrogen concentration threshold, and calculating the actual air-fuel ratio of the hydrogen engine in the current cycle based on the comparison result; when the actual air-fuel ratio of the hydrogen engine in the current cycle is inconsistent with the required air-fuel ratio, adjusting the hydrogen flow rate ejected by the hydrogen nozzle in the next cycle so that the actual air-fuel ratio of the hydrogen engine in the next cycle reaches the required air-fuel ratio. Although it can eliminate the risk of explosion of high-concentration hydrogen mixed gas in the turbocharger, accurately control the air-fuel ratio of the hydrogen engine, and reduce the risks of pre-ignition and knocking, the handling of the diversity of the mixed gas components is insufficient, resulting in a decline in the prediction ability for more complex mixed gases.

[0006] Currently, Prior Art One, Prior Art Two, and Prior Art Three have problems in insufficient handling of the diversity of mixed gas components, resulting in a decline in the prediction ability for more complex mixed gases, excessive computational complexity, and an increase in the computational complexity and engineering application concentration. To solve the above problems, this embodiment provides a method for judging the explosion hazard of a combustible gas-nitrogen mixture. Summary of the Invention

[0007] The main object of the present invention is to provide a method and system for judging the explosion hazard of a combustible gas-nitrogen mixture to solve the problems in the prior art of insufficient handling of the diversity of mixed gas components, resulting in a decline in the prediction ability for more complex mixed gases, excessive computational complexity, and an increase in the computational complexity and engineering application concentration.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A method for judging the explosion hazard of a combustible gas-nitrogen mixture, the method for judging the explosion hazard of a combustible gas-nitrogen mixture includes the following steps:

[0010] Based on the constraints formed by the lower explosion limit and the limiting oxygen concentration of the explosive gas in the mixture, a hyperbolic model is constructed;

[0011] Using a function graphing program, the corresponding model curve is drawn in a rectangular coordinate system to form an explosion area classification diagram; the two mixing data are input into the explosion area classification diagram, and the explosion hazard of the secondary mixture is judged according to the position where it is located;

[0012] If the hyperbola model determines that there is an explosion hazard, an alarm is immediately issued; and the data is transmitted to the cloud for real-time calibration; when the explosive gas mixture data reaches a preset similarity value with the cloud data, a pre-alarm is immediately issued.

[0013] As a further improvement of the present invention, the process of forming an explosion area classification map includes the following steps:

[0014] Construct a hyperbola model to analyze the mixed data of the explosive mixture. If the volume fraction of the combustible gas in the primary mixture explosion data is z, the volume ratio of the primary mixture to air is y:1, and the lower explosion limit of the combustible gas is C LEL ;

[0015] The primary mixture is mixed with air to obtain a secondary mixture; to analyze and determine whether the secondary mixture is explosive, the mixing parameters of the two mixtures need to be substituted into the hyperbola model; according to the lower explosion limit of the explosive substance in the primary mixture, the corresponding equation is made in the rectangular coordinate system; according to the limiting oxygen concentration of the explosive substance, the corresponding limiting secondary mixing ratio is obtained; furthermore, using the equation and the limiting secondary mixing ratio, an explosion area classification map is made; according to the volume fraction of the explosive substance in the primary mixture and the secondary mixing ratio, it is judged whether the secondary mixture is explosive in the explosion area classification map.

[0016] As a further improvement of the present invention, the process of analyzing the explosive data of the primary mixture includes the following steps:

[0017] The explosion area is divided into Zone 0, Zone 1, and Zone 2; among them, Zone 0 is the place where the explosive gas mixture continuously or permanently exists under normal conditions;

[0018] According to the explosion area, it is judged whether the area to be detected belongs to Zone 0, Zone 1, and Zone 2; if the concentration of the mixture detected in the detection area reaches the preset lower explosion limit value, it indicates that there is an explosion risk; if the detected oxygen concentration is lower than the limiting oxygen concentration, it indicates that the oxygen in the environment is insufficient to support a secondary explosion.

[0019] As a further improvement of the present invention, the process of obtaining whether the secondary mixture is explosive includes the following steps:

[0020] The volume fraction of the explosive substance in the primary mixture in the secondary mixture is greater than the lower explosion limit; the oxygen concentration in the secondary mixture is greater than the limiting oxygen concentration; calculate the secondary mixture;

[0021] Among them, the process of calculating the secondary mixture:

[0022]

[0023] Among them, y≥0;

[0024] Solution:

[0025]

[0026] Let Then y ′ < y < y LOC When, the secondary mixture has explosion hazard; y LOC is the multiple of the primary mixture gas to air when the oxygen in the mixture reaches the limiting oxygen concentration, that is In the formula: is the oxygen concentration in the air, and LOC is the limiting oxygen concentration;

[0027] The equation is a hyperbola in the rectangular coordinate system. Since 0 ≤ z ≤ 1, the calculation results are input into the hyperbola model for judgment.

[0028] As a further improvement of the present invention, the process of judging whether the secondary mixture is explosive includes the following steps:

[0029] According to the lower explosion limit and the limiting oxygen concentration in the explosion data of the primary mixture, the corresponding curve of the equation is drawn in the rectangular coordinate system, and the boundary lines Z = C LEL , z = 100% and LEL of the explosion area classification diagram are drawn according to the C

[0030] According to the volume percentage z 0 of the combustible gas in the explosion data of the primary mixture and the volume ratio of the primary mixture gas to air is y 0 :1, determine the point (z 0 , y 0 ) in the rectangular coordinate system corresponding to the two - stage mixing ratio; draw the two straight lines z = z 0 and y = y 0 in the rectangular coordinate system. The intersection point of the two straight lines is the coordinate point (z 0 , y 0 );

[0031] Judge whether the secondary mixture has explosion hazard through the regional position of the point (z 0 , y 0 ) on the explosion area classification diagram. For example, if the point (z 0 , y 0 ) is in area A, it means the secondary mixture is explosive; if it is in area B, it means the secondary mixture is not explosive, thus forming an explosion area classification diagram.

[0032] As a further improvement of the present invention, the process when the explosive gas mixture data reaches a preset similarity value with the cloud data includes the following steps:

[0033] The hyperbolic model analyzes the explosion area classification diagram. If it is determined that the secondary mixture is explosive, the alarm mechanism will be triggered immediately;

[0034] The monitored explosive gas mixture data is transmitted to the cloud server in real time. The cloud server stores the mixture explosion data and calibrates it in combination with historical data;

[0035] When the detected explosive gas mixture data reaches a preset similarity value with the historical data stored in the cloud server, the system will immediately issue a warning.

[0036] As a further improvement of the present invention, the model for determining the explosiveness of the secondary mixture:

[0037]

[0038] In the formula: H(t) represents the hyperbolic explosion index; C i (t) represents the real-time concentration of four key gases; C i,LFL represents the lower explosion limit of each gas; λ i represents the concentration coupling weight; ∈ represents the temperature sensitivity coefficient; T(t) represents the absolute environmental temperature; T ign represents the minimum ignition temperature; φ represents the pressure compensation phase angle; X j represents the time window dynamic weight; X j (t) represents the mole fraction of the secondary mixed components; X j0 represents the reference value of the initial inert gas proportion.

[0039] As a further improvement of the present invention, the cloud server data collaborative calibration equation:

[0040]

[0041] In the formula: represents the calibrated data in the k-th dimension; ω represents the confidence weight of the real-time data; represents the historical data covariance matrix; Σ new represents the new data covariance matrix; Tr(·) represents the matrix trace operation; represents the acquisition periods of the old and new data; represents the parameter space gradient; δ t represents the time decay constant; represents the historical data moving average.

[0042] As a further improvement of the present invention, the warning criterion for the similarity value:

[0043]

[0044] In the formula: represents the dynamic similarity index; DTW(·) represents the dynamic time warping distance; represents an n-dimensional feature vector; Γ n represents the normalization factor for each dimension; γ represents the Mahalanobis distance scaling factor; μ n represents an n-dimensional distribution mean vector; represents the mixed variance; represents the fractional power; ReLU(·) represents the rectified linear unit activation function; represents the similarity change rate threshold.

[0045] To achieve the above object, the present invention also provides the following technical solutions:

[0046] A flammable gas-nitrogen mixture explosion hazard judgment system, which is applied to the flammable gas-nitrogen mixture explosion hazard judgment method. The flammable gas-nitrogen mixture explosion hazard judgment system includes:

[0047] A hyperbola model construction module, which is used to construct a hyperbola model based on the constraints formed by the lower explosion limit and the limiting oxygen concentration of the explosive gas in the mixture;

[0048] An explosion attribute judgment module, which is used to use a function graphing program to draw a corresponding model curve in a rectangular coordinate system to form an explosion area classification map; input the two mixing data into the explosion area classification map, and judge the explosion hazard of the secondary mixture according to its location;

[0049] An explosion warning module, which is used to immediately issue an alarm if the hyperbola model determines that it is explosive; and transmit the data to the cloud for real-time calibration; when the data of the explosive gas mixture reaches the preset similarity value with the cloud data, an early warning will be immediately issued.

[0050] The present invention constructs a hyperbola model. By analyzing key parameters such as the lower explosion limit (LEL) and the limiting oxygen concentration (LOC) of the flammable gas in the mixture, a hyperbola model is established; this model can quantitatively describe the explosion risk boundary of the gas mixture and provide a mathematical basis for subsequent evaluation. Generate an area classification map and evaluate the hazard. Using a function graphing program, the hyperbola model is visualized in a rectangular coordinate system to generate an area classification map; by inputting the mixed gas data into this map, it can be intuitively judged whether it is in a dangerous area, so as to evaluate the explosion hazard of the secondary mixture. Real-time alarm and data calibration. If the hyperbola model determines that the mixed gas is explosive, the system will immediately trigger an alarm and upload the data to the cloud for real-time calibration. When the detected data matches the preset similarity value in the cloud, the system will further issue a warning signal. Brief Description of the Drawings

[0051] Figure 1 It is a schematic diagram of the step flow of an embodiment of the method for judging the explosion hazard of a combustible gas-nitrogen mixture according to the present invention;

[0052] Figure 2 It is a schematic diagram of the step flow of an embodiment of the method for forming an explosion area classification diagram of the method for judging the explosion hazard of a combustible gas-nitrogen mixture according to the present invention;

[0053] Figure 3 It is a schematic diagram of the step flow of an embodiment of the method for analyzing the explosive data of a primary mixture in the method for judging the explosion hazard of a combustible gas-nitrogen mixture according to the present invention;

[0054] Figure 4 It is a schematic diagram of the step flow of an embodiment of the method for judging whether a secondary mixture is explosive in the method for judging the explosion hazard of a combustible gas-nitrogen mixture according to the present invention;

[0055] Figure 5 It is a schematic diagram of the step flow of an embodiment of the method for judging whether a secondary mixture is explosive in the method for judging the explosion hazard of a combustible gas-nitrogen mixture according to the present invention;

[0056] Figure 6 It is a schematic diagram of the principle of explosion area classification of an embodiment of the method for judging the explosion hazard of a combustible gas-nitrogen mixture according to the present invention;

[0057] Figure 7 It is a schematic diagram of the principle of the point corresponding to the secondary mixture in the explosion area classification diagram of an embodiment of the method for judging the explosion hazard of a combustible gas-nitrogen mixture according to the present invention;

[0058] Figure 8 It is a schematic diagram of the step flow of an embodiment of the method for judging the explosion hazard of a combustible gas-nitrogen mixture according to the present invention when the data of the explosive gas mixture reaches a preset similarity value with the cloud data;

[0059] Figure 9 It is a schematic diagram of the functional modules of an embodiment of the system for judging the explosion hazard of a combustible gas-nitrogen mixture according to the present invention;

[0060] Figure 10 It is a schematic diagram of the structure of an embodiment of the electronic device according to the present invention;

[0061] Figure 11 It is a schematic diagram of the structure of an embodiment of the storage medium according to the present invention;

[0062] Figure 12 It is a schematic diagram of drawing a hyperbola through a python program according to the present invention. Detailed Description of the Invention

[0063] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0064] The terms "first", "second", and "third" in the present invention are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", and "third" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. All directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0065] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0066] As Figure 1 shown, this embodiment provides an embodiment of a method for judging the explosion hazard of a combustible gas-nitrogen mixture. In this embodiment, the method for judging the explosiveness of the combustible gas-nitrogen mixture specifically includes the following steps:

[0067] Step S1: Based on the constraints formed by the lower explosion limit and the limiting oxygen concentration of the explosive gas in the mixture, construct a hyperbolic model;

[0068] Step S2: Use a function graphing program to draw the corresponding model curve in a rectangular coordinate system to form an explosion area classification diagram; input the two mixing data into the explosion area classification diagram, and judge the explosion hazard of the secondary mixture according to its position.

[0069] Step S3: If the hyperbola model determines that there is an explosion risk, an alarm is immediately issued; and the data is transmitted to the cloud for real-time calibration; when the explosive gas mixture data reaches a preset similarity value with the cloud data, a pre-warning is immediately issued.

[0070] Preferably, in step S1 of this embodiment, a hyperbola model is constructed by analyzing key parameters such as the lower explosive limit (LEL) and the limiting oxygen concentration (LOC) of combustible gases in the mixture to establish a hyperbola model; this model can quantitatively describe the explosion risk boundary of the gas mixture and provide a mathematical basis for subsequent evaluation. Significance: The formation of the hyperbola model provides a scientific quantitative basis for hazard assessment and can effectively predict the potential explosion risks of different gas mixtures under different conditions. In step S2, a regional classification map is generated and the hazard is evaluated. Using a function plotting program, the hyperbola model is visualized in a rectangular coordinate system to generate a regional classification map; by inputting the mixed gas data into this map, it can be intuitively judged whether it is in a dangerous area, thereby evaluating the explosion hazard of the secondary mixture. Significance: The visual presentation of the regional classification map simplifies the analysis process of complex data, improves the efficiency and accuracy of hazard assessment, and facilitates operators to make quick judgments. In step S3, real-time alarm and data calibration are performed. If the hyperbola model determines that the mixed gas is explosive, the system will immediately trigger an alarm and upload the data to the cloud for real-time calibration. When the detected data matches the preset similarity value in the cloud, the system will further issue a pre-warning signal. Significance: The real-time alarm and data calibration mechanism ensure the timely response ability of the system and the accuracy of data analysis; the cloud calibration function enhances the adaptability and reliability of the system and can effectively reduce the probability of explosion accidents.

[0071] In summary, through mathematical model construction, data visualization, and real-time monitoring and warning, this embodiment realizes the accurate assessment and rapid response to the explosion risk of mixed gases, and has important safety value.

[0072] Further, as Figure 2 shown, the process of forming the explosion area classification map in step S2 specifically includes the following steps:

[0073] Step S21: Construct a hyperbola model and analyze the mixed data of the explosive mixture. If the volume fraction of the combustible gas in the primary mixture explosion data is z, the volume ratio of the primary mixture to air is y:1, and the lower explosive limit of the combustible gas is C LEL ;

[0074] Step S22: The primary mixture is mixed with air to obtain a secondary mixed gas; to analyze and judge whether the secondary mixture is explosive, the mixed parameters of the two mixtures need to be substituted into the hyperbola model;

[0075] Step S23: According to the lower explosion limit of the explosive substances in the primary mixture, corresponding equations are made in the rectangular coordinates; according to the limiting oxygen concentration of the explosive substances, the corresponding limiting secondary mixing ratio is obtained; furthermore, by using the equations and the limiting secondary mixing ratio, an explosion area classification diagram is made; according to the volume fraction of the explosive substances in the primary mixture and the secondary mixing ratio, it is judged whether the secondary mixture is explosive in the explosion area classification diagram.

[0076] Preferably, in step S21 of this embodiment, by constructing a hyperbola model and combining the explosive data of the primary mixture (such as the volume percentage z of combustible gas, the volume ratio y:1 to air, and the lower explosion limit C LEL ), the explosion limit range is analyzed, so as to provide a theoretical basis for subsequent judgment; in step S22, air is added to form a secondary mixture and its explosiveness is analyzed, further verifying the explosion possibility, and the results are incorporated into the hyperbola model to improve the applicability and accuracy of the model; in step S23, by using the lower explosion limit and the limiting oxygen concentration of the primary mixture, equations are drawn in the rectangular coordinates to form an explosion area classification diagram, intuitively judging whether the secondary mixture is explosive, and providing a scientific basis for actual engineering applications. This embodiment jointly realizes the accurate prediction and classification of the explosion limit of the mixed gas, and improves the reliability and efficiency of the explosion safety analysis.

[0077] Furthermore, as Figure 3 shown, the process of analyzing the explosive data of the primary mixture in step S21 specifically includes the following steps:

[0078] Step S211: Divide the explosion area into Zone 0, Zone 1, and Zone 2; among them, Zone 0 is the place where the explosive gas mixture continuously or exists for a long time under normal conditions; Zone 1 is the place where the explosive gas mixture may appear during normal operation; Zone 2 is the place where the explosive gas mixture has a low probability of appearing or exists for a short time during normal operation.

[0079] Step S212: Judge whether the area to be detected belongs to Zone 0, Zone 1, and Zone 2 according to the explosion area; if the concentration of the mixture detected in the detection area reaches the preset lower limit value of explosion, it indicates that there is an explosion risk; if the detected oxygen concentration is lower than the limiting oxygen concentration, it indicates that the oxygen in the environment is insufficient to support a secondary explosion.

[0080] If it is judged that there is an explosion risk, then in the explosion data of the primary mixture, the volume percentage of combustible gas is z, the volume ratio of the primary mixture explosion data to air is y:1, and the lower explosion limit of the combustible gas is C LEL .

[0081] Preferably, in step S211 of this embodiment: by dividing the dangerous area of the explosive gas environment into Zone 0, Zone 1, and Zone 2, and classifying according to the frequency and duration of the appearance of the explosive gas mixture, the danger levels of different areas are clarified. In step S212, it is judged whether there is an explosion risk by combining whether the detected mixture concentration reaches the preset lower explosion limit value and whether the oxygen concentration is lower than the limiting oxygen concentration. This embodiment can monitor the risk factors in the environment in real time, discover potential explosion hazards in time, and thus take targeted protective measures to improve safety. In the case of judging that there is an explosion risk, through the volume percentage (z) of the combustible gas in the primary mixture explosion data and the volume ratio (y:1) to air, combined with the lower explosion limit (C LEL ), the explosion risk is further quantified and corresponding safety measures are formulated.

[0082] Furthermore, as Figure 4 shown, the process of obtaining whether the secondary mixture is explosive in step S22 specifically includes the following steps:

[0083] Step S221: The volume fraction of the explosive substance in the primary mixture in the secondary mixed gas is greater than the lower explosion limit; the oxygen concentration in the secondary mixture is greater than the limiting oxygen concentration; calculate the secondary mixture;

[0084] Among them, the process of calculating the secondary mixture:

[0085]

[0086] Among them, y≥0;

[0087] Solve to get:

[0088]

[0089] Step S222: Let Then when y′<y<y LOC , the secondary mixture has explosion hazard; y LOC is the multiple of the primary mixed gas to air when the oxygen in the mixture reaches the limiting oxygen concentration, that is In the formula: is the oxygen concentration in the air, and LOC is the limiting oxygen concentration;

[0090] Step S223: The equation is a hyperbola in the rectangular coordinate system. Since 0≤z≤1; input the calculation result into the hyperbola model for judgment.

[0091] Preferably, in this embodiment, in step S221, the explosion hazard of the secondary mixture is determined by calculating the relationship between the oxygen concentration and the lower explosion limit in the secondary mixture, and the hyperbola model is used for judgment. Specifically, in step S221, the calculation formula zy / (y + 1) > C is used LEL to determine whether the secondary mixture is within the explosion range; in step S222, y^' = C is set LEL / (z - C LEL ) is used to determine the explosion hazard of the secondary mixture between the lower explosion limit and the limiting oxygen concentration; in step S223, the calculation result is input into the hyperbola model for further judgment. This embodiment can accurately evaluate the explosion risk of the secondary mixture and provide a scientific basis for safe operation.

[0092] Furthermore, as shown in Figure 5 , the process of step S23 for judging whether the secondary mixture is explosive specifically includes the following steps:

[0093] Step S231: According to the lower explosion limit and the limiting oxygen concentration in the explosion data of the primary mixture, the corresponding curve of the equation is drawn in the rectangular coordinate system, and the boundary lines Z = C LEL , z = 100%, and LEL of the explosion area classification diagram are drawn according to C

[0094] Step S232: According to the volume percentage z 0 of the combustible gas in the explosion data of the primary mixture and the volume ratio of the primary gas mixture to air as y 0 :1, the point (z 0 , y 0 ) corresponding to the two mixing ratios is determined in the rectangular coordinate system; the two straight lines z = z 0 and y = y 0 are drawn in the rectangular coordinate system, and the intersection point of the two straight lines is the coordinate point (z 0 , y 0 );

[0095] Step S233: Determine whether the secondary mixture has explosion hazard through the regional position of the point (z 0 , y 0 ) on the explosion area classification diagram. For example, if the point (z 0 , y 0 ) is in area A, it indicates that the secondary mixture is explosive; if it is in area B, it indicates that the secondary mixture is not explosive, thus forming an explosion area classification diagram.

[0096] Preferably, in step S231 of this embodiment, according to the lower explosion limit and the limiting oxygen concentration in the explosion data of the primary mixture, the equation corresponding curve, and based on the C of the explosive gas LEL and LOC, draw the boundary line Z = C of the explosion area classification diagram LEL , z = 100% and By drawing curves and boundary lines, visually display the explosion risk areas of different combustible gases at different oxygen concentrations. Step S232 is based on the volume percentage z of combustible gas in the primary mixture explosion data 0 and the volume ratio of the primary mixture gas to air is y 0 :1, determine the point (z 0 , y 0 ) in the rectangular coordinate system corresponding to the two mixing ratios; draw the two lines z = z 0 and y = y 0 in the rectangular coordinate system, and the intersection point of the two lines is the coordinate point (z 0 , y 0 ); by determining specific points and drawing lines, accurately locate the position of the secondary mixture in the explosion area classification diagram, simplify the complex data analysis process, and make the judgment process more intuitive and easy to operate. In step S233, determine whether the secondary mixture has explosion hazard through the regional position of the point (z 0， y 0 ) on the explosion area classification diagram. For example, if the point (z 0 , y 0 ) is in area A, it means the secondary mixture is explosive; if it is in area B, it means the secondary mixture is not explosive, thus forming an explosion area classification diagram; for the mixture of combustible gas - nitrogen mixture and air, the z-axis in the figure represents the volume percentage of combustible gas in the primary mixture, and the y-axis represents the volume ratio of the primary mixture to air. Obviously, during the second mixing process, the primary mixture dilutes the oxygen in the air, and the oxygen concentration in the secondary mixture decreases as y increases. When the oxygen concentration reaches the limiting oxygen concentration, the secondary mixture is not explosive; the explosion hazard of the combustible gas after the two mixings in any proportion combination can be read. The shaded area A above the curve is the explosion hazard area, and area B is the non-explosion hazard area, thereby providing a judgment method for determining the explosiveness of the mixture of combustible gas and air under nitrogen inhibition at normal temperature and pressure (for the specific principle, refer to Appendix Figure 6 and Appendix Figure 7 ).

[0097] Furthermore, as Figure 8 shown, step S3 when the data of the explosive gas mixture reaches the preset similarity value with the cloud data, specifically includes the following steps:

[0098] Step S31: Analyze the explosion area classification diagram using the hyperbola model. If it is determined that the secondary mixture is explosive, immediately trigger the alarm mechanism;

[0099] Step S32: Transmit the detected data of the explosive gas mixture to the cloud server in real time. The cloud server stores the mixture explosion data and calibrates it in combination with historical data.

[0100] Step S33: When the detected data of the explosive gas mixture reaches a preset similarity value with the historical data stored in the cloud server, the system will immediately issue a warning.

[0101] Among them, the model for judging the explosiveness of the secondary mixture in step S31:

[0102]

[0103] In the formula: H(t) represents the hyperbolic explosion index (>0.78 triggers an alarm); C i (t) represents the real-time concentrations of four key gases; C i,LFL represents the lower explosion limit of each gas (such as CH 4 = 5.0%); λ i represents the concentration coupling weight; ∈ represents the temperature sensitivity coefficient; T(t) represents the absolute environmental temperature; T ign represents the minimum ignition temperature; φ represents the pressure compensation phase angle; X j represents the dynamic weight of the time window; X j (t) represents the molar fraction of the secondary mixing components; X j0 represents the reference value of the proportion of the initial inert gas;

[0104] The data collaborative calibration equation of the cloud server in step S32:

[0105]

[0106] In the formula: represents the calibrated data in the k-th dimension; ω represents the confidence weight of the real-time data; represents the covariance matrix of the historical data; ∑ new represents the covariance matrix of the new data; Tr(·) represents the matrix trace operation; represents the acquisition periods of the old and new data; represents the parameter space gradient; δ t represents the time decay constant; represents the moving average of the historical data;

[0107] The warning criterion for the similarity value in step S33:

[0108]

[0109] In the formula: represents the dynamic similarity index (≥0.95 triggers a warning); DTW(·) represents the dynamic time warping distance; represents an n-dimensional feature vector (including concentration gradient, reaction enthalpy change, etc.); Γ n represents the normalization factor for each dimension; γ represents the Mahalanobis distance scaling factor; μ n represents an n-dimensional distribution mean vector; represents the mixed variance; represents the fractional power; ReLU(·) represents the rectified linear unit activation function; represents the similarity change rate threshold.

[0110] Preferably, in step S31 of this embodiment, the hyperbola model is used to analyze the explosion area classification map to determine whether the mixture is explosive; once it is determined that the mixture is explosive, the system will immediately activate the alarm mechanism to remind relevant personnel to take emergency measures by means of sound, light or text messages, etc.; through real-time analysis and the alarm mechanism, it is possible to quickly respond at the initial stage of the formation of the explosive gas mixture, avoid the spread of potential hazards; issue an alarm in a timely manner, reduce the accident risk caused by the leakage or accumulation of explosive gases, and protect the safety of personnel and equipment. In step S32, the data of the monitored explosive gas mixture is transmitted to the cloud server in real time by wireless or wired means; the cloud server stores the collected data and calibrates it in combination with historical data to improve the monitoring accuracy. The calibration process may include adjustments to temperature, time, and environmental conditions; by centrally storing and managing data through the cloud server, it is convenient for subsequent analysis and traceability; calibrating in combination with historical data can effectively reduce the monitoring deviation caused by environmental changes or equipment errors and improve the reliability of the overall monitoring system. In step S33, the system compares the currently monitored data of the explosive gas mixture with the historical data stored in the cloud server to determine whether its similarity reaches the preset threshold; once the similarity reaches the preset threshold, the system immediately issues a warning to indicate potential hazards; by comparing historical data, the system can identify possible dangerous trends in advance, so as to take preventive measures before the danger occurs; the warning mechanism helps to strengthen safety management and reduce accidents caused by the failure to detect dangers in a timely manner.

[0111] As Figure 9 shown, this embodiment also provides a flammable gas-nitrogen mixture explosion hazard judgment system. In this embodiment, the flammable gas-nitrogen mixture explosion hazard judgment system is applied to the flammable gas-nitrogen mixture explosion hazard judgment method as in the above embodiment. This flammable gas-nitrogen mixture explosion hazard judgment system includes:

[0112] A hyperbola model construction module 1, configured to construct a hyperbola model based on the constraints formed by the lower explosion limit and the limiting oxygen concentration of the explosive gas in the mixture;

[0113] The explosion property judgment module 2 is used to use a function graphing program to draw corresponding model curves in a rectangular coordinate system to form an explosion area classification diagram; input the two - time mixed data into the explosion area classification diagram, and judge the explosion risk of the secondary mixture according to its location.

[0114] The explosion warning module 3 is used to immediately issue an alarm if the hyperbola model is judged to be explosive; and transmit the data to the cloud for real - time calibration; when the data of the explosive gas mixture reaches a preset similarity value with the cloud data, an immediate warning is issued.

[0115] Preferably, in this embodiment, the hyperbola model construction module 1 constructs a hyperbola model by analyzing key parameters such as the lower explosive limit (LEL) and the limiting oxygen concentration (LOC) of combustible gases in the mixture to establish a hyperbola model; this model can quantitatively describe the explosion risk boundary of the gas mixture, providing a mathematical basis for subsequent evaluation. Significance: The formation of the hyperbola model provides a scientific quantitative basis for risk assessment and can effectively predict the potential explosion risks of different gas mixtures under different conditions. The explosion property judgment module 2 constructs a hyperbola model, analyzes the lower explosive limit and the limiting oxygen concentration of the explosive gas data of the primary mixture; inputs the secondary mixed gas into the hyperbola model for analysis and judgment to form an explosion area classification diagram; improves the accuracy of explosion risk prediction and provides scientific support for formulating safety measures. The explosion warning module 3 immediately issues an alarm if the hyperbola model is judged to be explosive; transmits the data to the cloud for real - time calibration; when the data of the explosive gas mixture reaches a preset similarity value with the cloud data, an immediate warning is issued; this embodiment realizes the real - time monitoring and rapid response to the explosive environment, improves the efficiency and reliability of the warning system; the data is transmitted to the cloud and calibrated in real - time, ensuring the accuracy and timeliness of the warning information, and facilitating subsequent data analysis and management; when an explosive gas mixture similar to the cloud data is detected, a timely warning can be issued to effectively avoid potential safety hazards.

[0116] As Figure 10 shown, this embodiment provides an embodiment of an electronic device. In this embodiment, the electronic device 4 includes a processor 41 and a memory 42 coupled to the processor 41.

[0117] The memory 42 stores program instructions for implementing the layout method of the combustible gas - nitrogen mixture explosion risk judgment device according to any of the above embodiments.

[0118] The processor 41 is used to execute the program instructions stored in the memory 42 to perform the layout of the combustible gas - nitrogen mixture explosion risk judgment device.

[0119] Among them, the processor 41 can also be referred to as a CPU (Central Processing Unit). The processor 41 may be an integrated circuit chip with the ability to process signals. The processor 41 can also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0120] Furthermore, Figure 11 FIG. is a schematic structural diagram of a storage medium according to an embodiment of the present application. The storage medium 5 of the embodiment of the present application stores program instructions 51 capable of implementing all the above methods. Among them, the program instructions 51 can be stored in the above storage medium in the form of a software product, including several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in various embodiments of the present application. The aforementioned storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc that can store program codes, or a terminal device such as a computer, a server, a mobile phone, or a tablet.

[0121] Furthermore, as Figure 12 shown, if it is necessary to determine the explosion hazard of the mixture after the mixture of carbon monoxide and nitrogen is mixed with air again, then after knowing the lower explosion limit (12.5%) of carbon monoxide, write the hyperbola formula Draw a hyperbola through a python program (as Figure 12 ), when in use, place the mouse on the corresponding coordinate point (Z, Y) of the mixing condition on the system interface, and check whether the area where it is located is an explosion hazard area, then it is possible to immediately determine whether the secondary mixture has an explosion hazard.

[0122] In several embodiments provided by the present invention, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, indirect couplings or communication connections of devices or units, and can be in electrical, mechanical, or other forms.

[0123] In addition, in each embodiment of the present invention, each functional unit can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

[0124] The specific embodiments of the invention have been described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modification or substitution of the invention is also within the scope of the present invention. Therefore, all equal transformations, modifications, improvements, etc. made without departing from the spirit and principles of the present invention should be covered by the scope of the present invention.

Claims

1. A method for judging the explosion hazard of a combustible gas-nitrogen mixture, characterized in that: The method for judging the explosion hazard of the combustible gas-nitrogen mixture comprises the following steps: Based on the constraints formed by the lower explosion limit and limiting oxygen concentration of explosive gases in the mixture, a hyperbolic model is constructed; Use the function drawing program to draw the corresponding model curve in the rectangular coordinate system to form the explosion area classification map; input the two mixing data into the explosion area classification map, and judge the explosion hazard of the secondary mixture according to the location; If the hyperbolic model determines that the gas is explosive, an alarm will be issued immediately, and the data will be transmitted to the cloud for real-time calibration. When the explosive gas mixture data and the cloud data reach a preset similarity value, an early warning will be issued immediately.

2. The method for judging the explosion hazard of a combustible gas-nitrogen mixture according to claim 1, characterized in that: The process of forming an explosion zone classification map includes the following steps: Construct a hyperbolic model to analyze the mixed data of explosive mixtures. If the volume fraction of combustible gas in the explosion data of a mixture is z, the volume ratio of the mixture volume to air is y:1, and the lower explosion limit of the combustible gas is C LEL ; The primary mixture is mixed with air to obtain a secondary mixture; to analyze and determine whether the secondary mixture is explosive, the mixing parameters of the two mixtures need to be substituted into the hyperbolic model; According to the lower explosion limit of the explosive material in the primary mixture, the corresponding equation is made in rectangular coordinates; according to the limiting oxygen concentration of the explosive material, the corresponding limiting secondary mixing ratio is calculated; then, using the equation and the limiting secondary mixing ratio, an explosion area classification diagram is made; according to the volume fraction of the explosive material in the primary mixture and the secondary mixing ratio, whether the secondary mixture is explosive is determined on the explosion area classification diagram.

3. The method for judging the explosion hazard of a combustible gas-nitrogen mixture according to claim 2, characterized in that: The process of analyzing the explosiveness data of a mixture includes the following steps: The explosion area is divided into Zone 0, Zone 1 and Zone 2; Zone 0 is the place where explosive gas mixture exists continuously or for a long time under normal circumstances; According to the explosion area, the area to be detected is judged to belong to zone 0, zone 1 and zone 2; if the concentration of the mixture detected in the detection area reaches the preset lower limit of the explosion, it indicates that there is an explosion risk; if the monitored oxygen concentration is lower than the limit oxygen concentration, it indicates that there is insufficient oxygen in the environment and supports a secondary explosion.

4. The method for judging the explosion hazard of a combustible gas-nitrogen mixture according to claim 2, characterized in that: The process of determining whether the secondary mixture is explosive includes the following steps: The volume fraction of the explosive substance in the primary mixture in the secondary mixture is greater than the lower explosion limit; the concentration of oxygen in the secondary mixture is greater than the limiting oxygen concentration; the secondary mixture is calculated; Among them, the process of calculating the secondary mixture is: Where y≥0; Solved: make Then y ′ <y<y LOC When the secondary mixture is explosive, LOC It is the multiple of the primary mixed gas to air when the oxygen in the mixture reaches the limiting oxygen concentration, that is, Where: is the oxygen concentration in the air, LOC is the limiting oxygen concentration; equation In the rectangular coordinate system, it is a hyperbola, since 0≤z≤1; the calculation result is input into the hyperbola model for judgment.

5. The method for judging the explosion hazard of a combustible gas-nitrogen mixture according to claim 2, characterized in that: The process of determining whether the secondary mixture is explosive includes the following steps: According to the lower explosion limit and limiting oxygen concentration in the explosion data of a mixture, the equation is made in the rectangular coordinate system. The corresponding curve of the explosive gas is LEL Draw the boundary line Z=C of the explosion area classification map with LOC LEL , z = 100% and According to the combustible gas volume percentage z0 in the explosion data of the first mixture and the volume ratio of the first mixture gas to air y0:1, determine the point (z0, y0) in the rectangular coordinate system corresponding to the two mixing ratios; draw two straight lines z=z0 and y=y0 in the rectangular coordinate system, and the intersection of the two straight lines is the coordinate point (z 0， y0); Through the point (z 0， y0) on the explosion area classification map, to determine whether the secondary mixture is explosive. 0， If point y0) is in area A, it means the secondary mixture is explosive, and if it is in area B, it means the secondary mixture is not explosive, thus forming an explosion area classification diagram.

6. The method for judging the explosion hazard of a combustible gas-nitrogen mixture according to claim 1, characterized in that: When the explosive gas mixture data and the cloud data reach a preset similarity value, the process includes the following steps: The hyperbolic model analyses the explosion zone classification map and if the secondary mixture is judged to be explosive, the alarm mechanism is immediately triggered; The monitored explosive gas mixture data is transmitted to the cloud server in real time, and the cloud server stores the mixture explosion data and calibrates it in combination with historical data; When the detected explosive gas mixture data reaches a preset similarity value with the historical data stored in the cloud server, the system will immediately issue an early warning.

7. The method for judging the explosion hazard of a combustible gas-nitrogen mixture according to claim 6, characterized in that: in, Model for judging whether a secondary mixture is explosive: Where: H(t) represents the hyperbolic explosion index; C i (t) represents the real-time concentration of four key gases; C i,LFL Indicates the lower explosion limit of each gas; λ i represents the concentration coupling weight; ∈ represents the temperature sensitivity coefficient; T(t) represents the absolute temperature of the environment; T ign represents the minimum ignition temperature; φ represents the pressure compensation phase angle; X j represents the dynamic weight of the time window; X j (t) represents the mole fraction of the secondary mixed component; X j0 Indicates the initial inert gas percentage reference value.

8. The method for judging the explosion hazard of a combustible gas-nitrogen mixture according to claim 6, characterized in that: Cloud server data collaborative calibration equation: Where: Represents the calibrated data of the kth dimension; ω represents the confidence weight of real-time data; Represents the covariance matrix of historical data; ∑ new represents the new data covariance matrix; Tr(·) represents the matrix trace operation; Indicates the collection cycle of new and old data; represents the parameter space gradient; δ t represents the time decay constant; Represents the moving average of historical data.

9. The method for judging the explosion hazard of a combustible gas-nitrogen mixture according to claim 6, characterized in that: Early warning criteria for similar values: Where: represents the dynamic similarity index; DTW(·) represents the dynamic time warping distance; represents the n-dimensional feature vector; Γ n represents the normalization factor of each dimension; γ represents the Mahalanobis distance scaling factor; μ n Represents the mean vector of n-dimensional distribution; represents mixed variance; ReLU(·) represents the rectified linear unit activation function. Indicates the similarity change rate threshold.

10. A system for judging the explosion hazard of a combustible gas-nitrogen mixture, which is applied to the method for judging the explosion hazard of a combustible gas-nitrogen mixture as claimed in any one of claims 1 to 9, characterized in that: The combustible gas-nitrogen mixture explosion hazard judgment system comprises: A hyperbolic model building module, used to build a hyperbolic model based on the constraints formed by the lower explosion limit and the limiting oxygen concentration of the explosive gas in the mixture; The explosion attribute judgment module is used to use the function drawing program to draw the corresponding model curve in the rectangular coordinate system to form the explosion area classification map; the two mixed data are input into the explosion area classification map to judge the explosion hazard of the secondary mixture according to the location; The explosion warning module is used to issue an alarm immediately if the hyperbolic model determines that the gas mixture is explosive, and transmit the data to the cloud for real-time calibration. When the explosive gas mixture data reaches a preset similarity value with the cloud data, an alarm is issued immediately.

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