A Method for Tracing the Source of Carbon Monoxide Gas in Coal Mines

Abstract

The present invention discloses a method for tracing the source of carbon monoxide gas in coal mines, which includes the following steps: First, select associated gases; Second, install gas monitoring devices; Third, collect data; Fourth, analyze the source of carbon monoxide at each measuring point; Fifth, trace back the source of carbon monoxide against the air current. The tracing method of the present invention is easy to operate. By arranging gas monitoring devices at specified positions in the roadway to measure the concentrations of associated gases and carbon monoxide, and adopting the method of tracing the source of associated gases to trace the source of carbon monoxide, after arranging the gas monitoring devices at a relatively safe time before the mine is exploited, the work of tracing the source of carbon monoxide can be completed above the ground, which can reduce the number of underground workers and is helpful for the operation of the mine with fewer people, unmanned operation, and intelligent operation.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine gas monitoring, and particularly relates to a method for tracing the source of carbon monoxide gas in coal mines underground. Background Art

[0002] During the coal mining process, toxic and harmful gases are often generated for various reasons. Among them, carbon monoxide can cause great harm to humans. Carbon monoxide is a toxic and harmful gas that poses a huge threat to industrial safety production. In coal mines underground, carbon monoxide is one of the main gases that cause gas explosions. Both the causes of gas explosions and the products after gas explosions are related to carbon monoxide. It can be seen that carbon monoxide causes huge losses to both industrial production and humans. Carbon monoxide has both reducibility and oxidability, and can undergo violent oxidation reactions (combustion reactions), disproportionation reactions, etc.; at the same time, it is toxic, and at higher concentrations, it can cause people to have varying degrees of poisoning symptoms, harming the brain, heart, liver, kidneys, lungs and other tissues of the human body, and even causing death by electroshock. Currently, the maximum allowable value of carbon monoxide gas in coal mines underground cannot exceed 0.0024%.

[0003] In summary, carbon monoxide brings many hazards to coal mines. Currently, the isotope tracing method is mostly used for carbon monoxide source tracing. The isotope tracing method requires sampling at positions where carbon monoxide frequently exceeds the limit underground, which poses certain potential safety hazards. Therefore, it is necessary to propose a safe and efficient method for tracing the source of carbon monoxide gas in coal mines to trace the carbon monoxide in the mine, which is convenient for discovering the reasons for the carbon monoxide exceeding the limit in the mine, so as to solve the hazards brought by carbon monoxide in the mine from the source. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for tracing the source of carbon monoxide gas in coal mines underground in view of the above-mentioned deficiencies in the prior art. The tracing method is simple to operate. By arranging gas monitoring devices at specified positions in the roadway to measure the concentrations of associated gases and carbon monoxide, and adopting the method of tracing the source of associated gases to trace the source of carbon monoxide, after arranging the gas monitoring devices at a relatively safe time before the coal mine is mined, the carbon monoxide source tracing work can be completed above the ground, which can reduce the number of underground workers and is helpful for the less-manned, unmanned and intelligent operation of the mine.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is: a method for tracing the source of carbon monoxide gas in coal mines underground, characterized in that the method comprises the following steps:

[0006] Step 1: Select associated gases: respectively extract the mixed gases from different sources of carbon monoxide generation in coal mines underground for gas component detection, select the associated gases corresponding to the gases extracted from each source, and calculate the ratio values of each associated gas;

[0007] Among them, the associated gases corresponding to the gases extracted from each source are all different;

[0008] Step 2. Install gas monitoring devices: Select multiple measurement points in the coal mine underground, and install a gas monitoring device at each measurement point to measure the concentration of carbon monoxide and the concentrations of various associated gases;

[0009] Step 3. Data collection: Collect the concentration of carbon monoxide and the concentrations of various associated gases at multiple measurement points through multiple gas monitoring devices respectively, and record the position and measurement data of each gas monitoring device;

[0010] Step 4. Analyze the source of carbon monoxide at each measurement point: Calculate the concentration of carbon monoxide from other sources at this measurement point according to the concentrations of various associated gases and the concentration of carbon monoxide at each measurement point;

[0011] Step 5. Trace the source of carbon monoxide against the air flow: According to the data of multiple measurement points recorded in Step 3, compare the concentrations of various associated gases at two adjacent measurement points in turn from front to back in the direction against the air flow, and trace the source and concentration of carbon monoxide corresponding to each associated gas according to the change in the concentration of each associated gas. When the concentrations of various associated gases at one of the measurement points are all zero, the tracing of carbon monoxide is completed.

[0012] The above-mentioned method for tracing the source of carbon monoxide gas in a coal mine underground is characterized in that: in Step 1, the sources of carbon monoxide generated in the coal mine underground include oxidation of floating coal in the goaf, exhaust gas of rubber-tyred vehicles, and underground blasting. Among them, oxidation of floating coal in the goaf generates associated gas A, exhaust gas of rubber-tyred vehicles generates associated gas B, and underground blasting generates associated gas C.

[0013] The above-mentioned method for tracing the source of carbon monoxide gas in a coal mine underground is characterized in that: in Step 2, when selecting measurement points in the coal mine underground, the measurement points are selected at the return air roadway of the coal mining face, the return air roadway of the mining area, the main return air roadway of the mine, the return air roadway of the heading face, the intake end of the drainage pump pipeline, the in-seam borehole of the working face, the upper corner, the drainage roadway, the locations required in the fire prevention measures, and 10 m away from the roadway mouth at each branch roadway at the multi-road intersection.

[0014] The above-mentioned method for tracing the source of carbon monoxide gas in a coal mine underground is characterized in that: the associated ratio F of the oxidation of floating coal in the goaf to generate associated gas A A = X a / X A , the associated ratio F of the exhaust gas of rubber-tyred vehicles to generate associated gas B B = X b / X B , the associated ratio F of underground blasting to generate associated gas C C = X c / XC ;

[0015] Among them, X a is the concentration of carbon monoxide generated by the oxidation of floating coal in the goaf, X A is the concentration of associated gas A generated by the oxidation of floating coal in the goaf, X b is the concentration of carbon monoxide generated by the exhaust gas of the rubber-tyred vehicle, X B is the concentration of associated gas B generated by the exhaust gas of the rubber-tyred vehicle, X c is the concentration of carbon monoxide generated by underground blasting, X C is the concentration of associated gas C generated by underground blasting.

[0016] For the above method for tracing the source of carbon monoxide gas in a coal mine, it is characterized in that: in step four, when analyzing the source of carbon monoxide at the i-th measurement point, according to the formula X ai = F A × X Ai , calculate the concentration X ai of carbon monoxide from the oxidation of floating coal in the goaf at the i-th measurement point;

[0017] According to the formula X bi = F B × X Bi , calculate the concentration X bi of carbon monoxide from the exhaust gas of the rubber-tyred vehicle at the i-th measurement point;

[0018] According to the formula X ci = F C × X Ci , calculate the concentration X ci of carbon monoxide from underground blasting at the i-th measurement point;

[0019] According to the formula X ti = X i - X ai - X bi - X ci , calculate the concentration X ti of carbon monoxide from other sources at the i-th measurement point;

[0020] Among them, i is a positive integer and i is not greater than the total number of measurement points, X Ai is the concentration of associated gas A at the i-th measurement point, X Bi is the concentration of associated gas B at the i-th measurement point, X Ci is the concentration of associated gas C at the i-th measurement point, X i is the concentration of carbon monoxide at the i-th measurement point.

[0021] The above-mentioned method for tracing the source of carbon monoxide gas in coal mines is characterized in that: in step five, when comparing the concentrations of various associated gases at two adjacent measuring points in sequence from front to back in the reverse air flow direction, if there is no roadway intersection between the two measuring points, it is judged whether the data measured at the upstream measuring point among the two measuring points changes compared with the data measured at the downstream measuring point;

[0022] When the data measured at the upstream measuring point among the two measuring points does not change compared with the data measured at the downstream measuring point, continue to trace the source of carbon monoxide upstream in the reverse air flow direction;

[0023] When at least one of the concentrations of the associated gases changes when the data measured at the upstream measuring point among the two measuring points is compared with the data measured at the downstream measuring point, it indicates that the source of carbon monoxide corresponding to the associated gas with the concentration change is located in the roadway between the downstream measuring point and the upstream measuring point.

[0024] The above-mentioned method for tracing the source of carbon monoxide gas in coal mines is characterized in that: in step five, when comparing the concentrations of various associated gases at two adjacent measuring points in sequence from front to back in the reverse air flow direction, if there is a roadway intersection between the two measuring points, then one downstream measuring point corresponds to multiple upstream measuring points, and the number of upstream measuring points is equal to the number of branch roadways. Calculate the concentrations of various associated gases after mixing the gases at the upstream measuring points respectively according to the data of multiple upstream measuring points and the roadway air volume, and compare the concentrations of various associated gases after mixing the gases at the upstream measuring points with the concentrations of various associated gases at the downstream measuring point;

[0025] When the concentrations of various associated gases after mixing the gases at the upstream measuring points do not change compared with the concentrations of various associated gases at the downstream measuring point, determine which branch roadway each associated gas comes from, and continue to trace the source of carbon monoxide upstream in the reverse air flow direction for each branch roadway with associated gas;

[0026] When at least one of the concentrations of the associated gases changes when the concentrations of various associated gases after mixing the gases at the upstream measuring points are compared with the concentrations of various associated gases at the downstream measuring point, it indicates that the source of carbon monoxide corresponding to the associated gas with the concentration change is located at the roadway intersection, and continue to trace the source of carbon monoxide upstream in the reverse air flow direction for each branch roadway with associated gas.

[0027] The above-mentioned method for tracing the source of carbon monoxide gas in coal mines is characterized in that: the calculation methods for the concentrations of various associated gases after mixing the gases at the upstream measuring points are the same. When calculating the concentration of associated gas A after mixing the gases at the upstream measuring points according to the data of multiple upstream measuring points and the roadway air volume, according to the formula Calculate the concentration X of the associated gas A after mixing the gases at multiple upstream measuring points AM ;

[0028] Where n is the number of upstream branch lanes at the lane intersection, n is a positive integer and n>1, Q1, Q1, ..., Q n are the air volumes of n branched lanes, X A1 , X A2 ,……,X An They are the concentrations of associated gas A measured at the upstream measuring points corresponding to n branch tunnels.

[0029] The above-mentioned method for tracing the source of carbon monoxide gas in a coal mine is characterized by: when determining which branch tunnels each associated gas comes from, when there is only one associated gas whose concentration is not zero in the measurement data of the upstream measuring point of a branch tunnel, it means that the associated gas only comes from the branch tunnel; when there is one associated gas whose concentration is not zero in the measurement data of the upstream measuring points of multiple branch tunnels, it means that the associated gas comes from multiple branch tunnels; the content of each associated gas from each branch tunnel is calculated in combination with the air volume of each branch tunnel, and for the branch tunnels with at least one associated gas concentration not zero, the source of carbon monoxide is traced upstream in the direction against the wind flow.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1. The present invention traces the source of carbon monoxide by arranging gas monitoring devices at specified positions in the tunnel to measure the concentration of associated gases and carbon monoxide. This method can be arranged at a relatively safe time before mining, which can effectively improve safety. After the gas monitoring device is arranged, the carbon monoxide source tracing work can be completed on the well, which can reduce the number of people working underground and help the mine to operate with fewer people, no one, and intelligent operation.

[0032] 2. The present invention adopts the associated gas source tracing method, which is convenient and timely. It can be used for a long time without affecting underground operations. Regular implementation is conducive to timely discovery of existing and potential dangers underground, so as to carry out corresponding solutions, which is conducive to the development of mine safety work.

[0033] 3. The present invention adopts the associated gas source tracing method, which has a wide tracing range and foreseeable development prospects. It can realize the tracing of carbon monoxide in the macroscopic range of the entire mine, which is convenient for quickly obtaining the source of carbon monoxide underground.

[0034] In summary, the traceability method of the present invention is easy to operate. By arranging gas monitoring devices at specified positions in the roadway to measure the concentrations of associated gases and carbon monoxide, and adopting the method of tracing the associated gases to trace the source of carbon monoxide, after arranging the gas monitoring devices at a relatively safe time before mine exploitation, the carbon monoxide traceability work can be completed above ground, which can reduce the number of underground workers and is helpful for the less-manned, unmanned, and intelligent operation of the mine.

[0035] Next, through the attached drawings and embodiments, the technical solution of the present invention will be further described in detail. Description of the Drawings

[0036] Figure 1 It is a flowchart of the method of the present invention. Detailed Embodiments

[0037] As Figure 1 shown, a method for tracing carbon monoxide gas in a coal mine underground, the method includes the following steps:

[0038] Step 1. Select associated gases: Respectively extract the mixed gases from different sources of carbon monoxide generation in the coal mine underground for gas composition detection, and select the associated gases corresponding to the gases extracted from each source, and calculate the ratio values of each associated gas;

[0039] Among them, the associated gases corresponding to the gases extracted from each source are all different;

[0040] Step 2. Install gas monitoring devices: Select multiple measurement points in the coal mine underground, and install a gas monitoring device at each measurement point for measuring the concentration of carbon monoxide and the concentrations of various associated gases;

[0041] Step 3. Data collection: Respectively collect the concentrations of carbon monoxide and various associated gases at multiple measurement points through multiple gas monitoring devices, and record the position and measurement data of each gas monitoring device;

[0042] Step 4. Analyze the source of carbon monoxide at each measurement point: According to the concentrations of various associated gases and carbon monoxide at each measurement point, calculate the concentration of carbon monoxide from other sources at this measurement point;

[0043] Step 5. Trace the source of carbon monoxide against the air flow: According to the data of multiple measurement points recorded in Step 3, compare the concentrations of various associated gases at two adjacent measurement points in turn from front to back in the direction against the air flow, and trace the source and concentration of carbon monoxide corresponding to each associated gas according to the change in the concentration of each associated gas. When the concentrations of various associated gases at one of the measurement points are all zero, the traceability of carbon monoxide is completed.

[0044] In actual use, the basis of the carbon monoxide traceability method using associated gas recognition is that the gases in the same roadway will mix evenly during the flow process, and the concentration ratio of the gases will not change without external conditions affecting the flow of the mixed gas in the roadway. When encountering a roadway bifurcation, the gas will be diverted, and when encountering a roadway merger, the gas will be mixed, and the gas concentration ratio will not change without external gas inflow. Among the gases generated by the same production pathway as carbon monoxide, a gas is selected as the associated gas for the carbon monoxide generated by this pathway. If the associated gas will not be generated by other pathways in the mine, the ratio of its concentration at any position in the mine to the concentration of carbon monoxide generated by this pathway will remain constant.

[0045] In specific implementation, when extracting and detecting the gas components of the mixed gases from different sources that generate carbon monoxide in the coal mine underground, the gases generated by the oxidation of floating coal in the goaf, the exhaust gas of rubber-tyred vehicles, and underground blasting are extracted and detected respectively, and their gas components are determined. According to their gas components, a suitable gas is selected as a marker, called the associated gas, and the carbon monoxide concentration at the measuring point is divided by the concentration of the associated gas to obtain the associated ratio value of the associated gas.

[0046] It should be noted that the associated gas cannot be carbon monoxide. The associated gases selected for different sources should be different, and the associated gas should not change under various mine environments, such as participating in reactions, converting into other gases, etc.

[0047] In specific implementation, when installing the gas monitoring device at the measuring point, the gas monitoring device should be vertically suspended at a position with stable air flow above the roadway, not more than 300 mm from the roof beam and not less than 200 mm from the roadway wall, and it should be convenient for installation and maintenance without affecting pedestrians and vehicle traffic.

[0048] In actual use, by using the method of associated gas monitoring to trace carbon monoxide, the generation mechanism and transmission path of carbon monoxide in the coal mine can be better understood. Based on this information, coal mine managers can optimize the ventilation system, monitoring devices, and personnel arrangements in the coal mine to minimize the accumulation and exposure risks of carbon monoxide. The release of carbon monoxide in coal mine accidents is often one of the main causes of accidents. Through the traceability method and experimental device, the source of carbon monoxide can be traced and help determine the cause of the accident, so as to take appropriate measures to prevent the recurrence of similar accidents. Carbon monoxide is a colorless and odorless toxic gas that poses a serious threat to human health. By tracing and monitoring the concentration of carbon monoxide in the coal mine, the safety risks of the coal mine can be evaluated and corresponding measures can be taken to ensure the safety of workers.

[0049] In specific implementation, the concentration of associated gas and carbon monoxide is measured by arranging gas monitoring devices at specified positions in the roadway to trace the source of carbon monoxide. This method can be arranged at a relatively safe time before coal mine exploitation, effectively improving safety. After the gas monitoring devices are arranged, the carbon monoxide tracing work can be completed above ground, reducing the number of underground workers and helping with the less-manned, unmanned, and intelligent operation of the coal mine.

[0050] In addition, the associated gas tracing method is relatively convenient and timely. It can be used for a long time without affecting underground operations. Regularly carrying it out is conducive to timely discovering existing and potential dangers underground, so as to carry out corresponding solutions, which is conducive to the development of coal mine safety work.

[0051] Particularly, the associated gas tracing method has a wide tracing range and a foreseeable development prospect. It can trace carbon monoxide within the macroscopic scope of the entire coal mine. A set of coal mine carbon monoxide gas tracing software system can be developed based on this method, using technical means to accelerate the analysis process and quickly obtain the source of carbon monoxide underground.

[0052] In this embodiment, the gas monitoring device is customized according to the gas to be monitored. It integrates different sensors according to the type of associated gas selected to achieve precise monitoring of the associated gas.

[0053] In this embodiment, in step one, the sources of carbon monoxide generation in the coal mine underground include gob floating coal oxidation, rubber-tyred vehicle exhaust gas, and underground blasting. Among them, gob floating coal oxidation generates associated gas A, rubber-tyred vehicle exhaust gas generates associated gas B, and underground blasting generates associated gas C.

[0054] In actual use, nitrogen can be selected as the associated gas for underground blasting, and acetaldehyde, hydrocarbons, etc. can be selected as the associated gas in rubber-tyred vehicle exhaust gas. The associated gas generated by gob floating coal oxidation can be selected from the coal oxidation index gases of this coal mine. The specific selection of the associated gas needs to be determined after analyzing the types of explosives used in the coal mine, rubber-tyred vehicle fuels, coal types, etc.

[0055] In this embodiment, in step two, when selecting measuring points in the coal mine underground, the measuring points are selected at the return air roadway of the coal mining face, the return air roadway of the mining area, the main return air roadway of the coal mine, the return air roadway of the heading face, the intake end of the drainage pump pipeline, the cross-measure borehole of the working face, the upper corner, the drainage roadway, the drainage pipeline at the drainage site, the locations required in the fire prevention measures, and 10 m away from the roadway opening at each bifurcation roadway at the multi-road intersection.

[0056] In this embodiment, the associated ratio F of the gob floating coal oxidation generating associated gas A A =X a / X A The associated ratio F of the rubber-tyred vehicle exhaust gas generating associated gas BB = X b / X B , the associated ratio F of the associated gas C generated by underground blasting C = X c / X C ;

[0057] Among them, X a is the concentration of carbon monoxide generated by the oxidation of floating coal in the gob, X A is the concentration of the associated gas A generated by the oxidation of floating coal in the gob, X b is the concentration of carbon monoxide generated by the exhaust gas of the rubber-tyred vehicle, X B is the concentration of the associated gas B generated by the exhaust gas of the rubber-tyred vehicle, X c is the concentration of carbon monoxide generated by underground blasting, X C is the concentration of the associated gas C generated by underground blasting.

[0058] In this embodiment, in step four, when analyzing the source of carbon monoxide at the i-th measurement point, according to the formula X ai = F A × X Ai , the concentration X ai of carbon monoxide from the oxidation of floating coal in the gob at the i-th measurement point is calculated;

[0059] According to the formula X bi = F B × X Bi , the concentration X bi of carbon monoxide from the exhaust gas of the rubber-tyred vehicle at the i-th measurement point is calculated;

[0060] According to the formula X ci = F C × X Ci , the concentration X ci of carbon monoxide from underground blasting at the i-th measurement point is calculated;

[0061] According to the formula X ti = X i - X ai - X bi - X ci , the concentration X ti of carbon monoxide from other sources at the i-th measurement point is calculated;

[0062] Among them, i is a positive integer and i is not greater than the total number of measurement points, X Ai is the concentration of the associated gas A at the i-th measurement point, X Bi is the concentration of the associated gas B at the i-th measurement point, X Ci is the concentration of the associated gas C at the i-th measurement point, X i is the concentration of carbon monoxide at the i-th measurement point.

[0063] In actual use, by analyzing the sources of carbon monoxide at each measuring point and according to the concentrations of carbon monoxide generated from different sources, corresponding measures can be effectively adopted, thereby reducing the occurrence of safety accidents.

[0064] In this embodiment, in step five, when comparing the concentrations of various associated gases at two adjacent measuring points in sequence from front to back in the direction of the reverse air current, if there is no roadway intersection between the two measuring points, it is determined whether the data measured at the upstream measuring point among the two measuring points changes compared with the data measured at the downstream measuring point.

[0065] When the data measured at the upstream measuring point among the two measuring points does not change compared with the data measured at the downstream measuring point, continue to trace back the source of carbon monoxide upstream in the direction of the reverse air current.

[0066] When at least one of the concentrations of the associated gases changes when the data measured at the upstream measuring point among the two measuring points is compared with the data measured at the downstream measuring point, it indicates that the source of carbon monoxide corresponding to the associated gas with the concentration change is located in the roadway between the downstream measuring point and the upstream measuring point.

[0067] In actual use, when tracing the source of carbon monoxide, the data collected at two measuring points are analyzed and compared respectively in the direction of the reverse air current to find the source of carbon monoxide.

[0068] In this embodiment, in step five, when comparing the concentrations of various associated gases at two adjacent measuring points in sequence from front to back in the direction of the reverse air current, if there is a roadway intersection between the two measuring points, then one downstream measuring point corresponds to multiple upstream measuring points, and the number of upstream measuring points is equal to the number of bifurcated roadways. The concentrations of various associated gases after mixing the gases at the upstream measuring points are calculated respectively according to the data of the multiple upstream measuring points and the roadway air volume, and the concentrations of various associated gases after mixing the gases at the upstream measuring points are compared with the concentrations of various associated gases at the downstream measuring point.

[0069] When the concentrations of various associated gases after mixing the gases at the upstream measuring points do not change compared with the concentrations of various associated gases at the downstream measuring point, determine which bifurcated roadway each associated gas comes from, and continue to trace back the source of carbon monoxide upstream in the direction of the reverse air current for each bifurcated roadway with associated gas.

[0070] When at least one of the concentrations of the associated gases changes when the concentrations of various associated gases after mixing the gases at the upstream measuring points are compared with the concentrations of various associated gases at the downstream measuring point, it indicates that the source of carbon monoxide corresponding to the associated gas with the concentration change is located at the roadway intersection, and continue to trace back the source of carbon monoxide upstream in the direction of the reverse air current for each bifurcated roadway with associated gas.

[0071] In specific implementation, when the concentration of at least one associated gas changes when comparing the concentrations of the associated gases after gas mixing at the upstream measurement point with the concentrations of the associated gases at the downstream measurement point, it indicates that the source of carbon monoxide corresponding to the associated gas with a concentration change is located at the roadway intersection. Here, the roadway intersection refers to the roadway section between the position of the upstream measurement point and the position of the downstream measurement point in each branch roadway where the carbon monoxide source may exist.

[0072] During actual use, when tracing the source of carbon monoxide upstream against the air flow direction in each branch roadway with associated gases, it is necessary to determine whether the data measured at the upstream measurement point among the two measurement points changes compared with the data measured at the downstream measurement point.

[0073] In this embodiment, the calculation methods for the concentrations of the associated gases after gas mixing at the upstream measurement point are the same. When calculating the concentration of associated gas A after gas mixing at the upstream measurement point based on the data of multiple upstream measurement points and the roadway air volume, according to the formula The concentration X of associated gas A after gas mixing at multiple upstream measurement points is calculated AM ;

[0074] where n is the number of upstream branch roadways at the roadway intersection, n is a positive integer and n > 1, Q1, Q1,..., Q n are the air volumes of the n branch roadways respectively, and X A1 , X A2 ,..., X An are the concentrations of associated gas A measured at the upstream measurement points corresponding to the n branch roadways respectively.

[0075] In specific implementation, when calculating the concentration of associated gas B after gas mixing at the upstream measurement point based on the data of multiple upstream measurement points and the roadway air volume, according to the formula The concentration X of associated gas B after gas mixing at multiple upstream measurement points is calculated BM ;

[0076] where X B1 , X B2 ,..., X Bn are the concentrations of associated gas B measured at the upstream measurement points corresponding to the n branch roadways respectively;

[0077] When calculating the concentration of associated gas C after gas mixing at the upstream measurement point based on the data of multiple upstream measurement points and the roadway air volume, according to the formula The concentration X of associated gas A after gas mixing at multiple upstream measurement points is calculated CM ;

[0078] where XC1 、X C2 、……、X Cn are the concentrations of associated gas C measured at the upstream side measurement points corresponding to n branch roadways respectively.

[0079] In this embodiment, when determining which branch roadway each associated gas comes from, when there is only one non-zero concentration of an associated gas in the measurement data of the upstream side measurement point of only one branch roadway, it indicates that the associated gas only comes from that branch roadway; when there is a non-zero concentration of an associated gas in the measurement data of the upstream side measurement points of multiple branch roadways, it indicates that the associated gas comes from multiple branch roadways; calculate the content of each associated gas from each branch roadway by combining the air volume of each branch roadway respectively, and continue to trace the source of carbon monoxide upstream in the reverse air flow direction for the branch roadways with at least one non-zero concentration of an associated gas.

[0080] Specifically, when calculating the content of each associated gas from each branch roadway by combining the air volume of each branch roadway respectively, by multiplying the air volume of each branch roadway by the concentration of one of the associated gases measured at its upstream side measurement point, the content of the associated gas corresponding to each branch roadway can be obtained.

[0081] In actual use, since measurement points are arranged at the entrances of each branch roadway at the multi-road intersection, when there is a roadway intersection between the upstream side measurement point and the downstream side measurement point, there are multiple upstream side measurement points corresponding to the downstream side measurement point.

[0082] In this embodiment, if the concentrations of multiple associated gases are all zero at one of the upstream side measurement points at the roadway intersection, then the branch roadway corresponding to this upstream side measurement point has completed the traceability of carbon monoxide and does not need to continue the traceability;

[0083] If at least one of the concentrations of the associated gases is non-zero at one of the upstream side measurement points at the roadway intersection, then continue to trace the source of carbon monoxide upstream in the reverse air flow direction for the branch roadway corresponding to this upstream side measurement point.

[0084] The above is only a preferred embodiment of the present invention, and does not impose any limitation on the present invention. Any simple modification, change, and equivalent structural change made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A method for tracing the source of carbon monoxide gas in a coal mine, characterized in that: The method comprises the following steps: Step 1: Select associated gas: extract mixed gas from different sources of carbon monoxide in the coal mine for gas composition detection, select the associated gas corresponding to the gas extracted from each source, and calculate the ratio value of each associated gas; Among them, the associated gases corresponding to the gases extracted from each source are all different; Step 2: Install a gas monitoring device: Select multiple measuring points in the coal mine, and install a gas monitoring device at each measuring point to measure the concentration of carbon monoxide and the concentration of each associated gas; Step 3: Data collection: The concentration of carbon monoxide and the concentration of each associated gas at multiple measuring points are collected through multiple gas monitoring devices, and the position and measurement data of each gas monitoring device are recorded; Step 4: Analyze the source of carbon monoxide at each measuring point: Calculate the concentration of carbon monoxide from other sources at each measuring point based on the concentration of each associated gas and the concentration of carbon monoxide at each measuring point; Step 5: Tracing the source of carbon monoxide against the wind flow: Based on the data of multiple measuring points recorded in step 3, the concentrations of each associated gas at two adjacent measuring points are compared from front to back in the direction of the against the wind flow, and the source and concentration of carbon monoxide corresponding to each associated gas are traced according to the concentration changes of each associated gas. When the concentrations of each associated gas at one of the measuring points are all zero, the tracing of carbon monoxide is completed; In step 5, when the concentrations of the associated gases at two adjacent measuring points are compared from front to back in the direction of the adverse wind flow, if there is a tunnel intersection between the two measuring points, one downstream measuring point corresponds to multiple upstream measuring points, and the number of upstream measuring points is equal to the number of bifurcated tunnels. The concentrations of the associated gases after the gases at the upstream measuring points are calculated based on the data of the multiple upstream measuring points combined with the tunnel air volume, and the concentrations of the associated gases after the gases at the upstream measuring points are compared with the concentrations of the associated gases at the downstream measuring points. When the concentration of each associated gas after the gas mixture at the upstream measuring point does not change compared with the concentration of each associated gas at the downstream measuring point, determine which branch tunnel each associated gas comes from, and continue to trace the source of carbon monoxide upstream in the direction of the counter-wind flow for each branch tunnel with associated gas; When the concentration of each associated gas after the gas mixture at the upstream measuring point is compared with the concentration of each associated gas at the downstream measuring point, at least one of the associated gases has changed in concentration, which indicates that the source of carbon monoxide corresponding to the associated gas with concentration change is located at the intersection of the tunnels, and the source of carbon monoxide is traced upstream in the direction of the counter-wind flow for each bifurcated tunnel with associated gas; The calculation method of the concentration of each associated gas after the gas at the upstream measuring point is the same. When the concentration of the associated gas A after the gas at the upstream measuring point is calculated based on the data of multiple upstream measuring points combined with the roadway air volume, the formula Calculate the concentration X of the associated gas A after mixing the gases at multiple upstream measuring points AM ; Where n is the number of upstream branch lanes at the lane intersection, n is a positive integer and n>1, Q1, Q1, ..., Q n are the air volumes of n branched lanes, X A1 , X A2 ,……,X An They are the concentrations of associated gas A measured at the upstream measuring points corresponding to n branch tunnels.

2. A method for tracing the source of carbon monoxide gas in a coal mine according to claim 1, characterized in that: In step one, the sources of carbon monoxide produced in the coal mine include oxidation of floating coal in the goaf, exhaust gas from rubber-wheeled vehicles and underground blasting. The oxidation of floating coal in the goaf produces associated gas A, exhaust gas from rubber-wheeled vehicles produces associated gas B, and underground blasting produces associated gas C.

3. A method for tracing the source of carbon monoxide gas in a coal mine according to claim 1, characterized in that: In step 2, when selecting measuring points underground in the coal mine, the measuring points are selected at the return air lane of the coal mining face, the return air lane of the mining area, the main return air lane of the mine, the return air lane of the excavation face, the air inlet end of the extraction pump pipeline, the borehole along the working face, the upper corner, the extraction lane, the locations required by the fire prevention measures, and the locations 10m away from the lane entrance of each branch lane at the intersection of multiple lanes.

4. A method for tracing the source of carbon monoxide gas in a coal mine according to claim 2, characterized in that: The associated ratio F of the associated gas A generated by oxidation of floating coal in the goaf A =X a / X A , the associated gas B produced by the exhaust gas of the rubber-wheeled vehicle has an associated ratio F B =X b / X B , the associated gas ratio F of underground blasting C =X c / X C ; Among them, X a is the concentration of carbon monoxide produced by oxidation of floating coal in the goaf, X A is the concentration of associated gas A produced by oxidation of floating coal in goaf, X b is the concentration of carbon monoxide produced by the exhaust gas of the rubber-wheeled vehicle, X B is the concentration of associated gas B generated by the exhaust of rubber-wheeled vehicles, X c is the concentration of carbon monoxide produced by underground blasting, X C It is the concentration of associated gas C produced by underground blasting.

5. A method for tracing the source of carbon monoxide gas in a coal mine according to claim 2, characterized in that: In step 4, when analyzing the source of carbon monoxide at the i-th measuring point, according to the formula X ai =F A ×X Ai , calculate the carbon monoxide concentration X from the oxidation of floating coal in the goaf at the i-th measuring point ai ; According to the formula X bi =F B ×X Bi , calculate the carbon monoxide concentration X from the exhaust gas of the rubber-wheeled vehicle at the i-th measuring point bi ; According to the formula X ci =F C ×X Ci , calculate the concentration of carbon monoxide from underground blasting at the i-th measuring point X ci ; According to the formula X ti =X i -X ai -X bi -X ci , calculate the concentration of carbon monoxide from other sources at the i-th measuring point X ti ; Where i is a positive integer and i is not greater than the total number of measurement points. Ai is the concentration of associated gas A at the i-th measuring point, X Bi is the concentration of the associated gas B at the i-th measuring point, X Ci is the concentration of the associated gas C at the i-th measuring point, X i is the concentration of carbon monoxide at the i-th measuring point.

6. A method for tracing the source of carbon monoxide gas in a coal mine according to claim 1, characterized in that: In step 5, when the concentrations of the associated gases at two adjacent measuring points are compared from front to back in the direction of the adverse wind flow, if there is no tunnel intersection between the two measuring points, it is determined whether the data measured at the upstream measuring point of the two measuring points has changed compared with the data measured at the downstream measuring point; When the data measured at the upstream measuring point of the two measuring points do not change compared with the data measured at the downstream measuring point, continue to trace the source of carbon monoxide upstream in the direction of the counterwind flow; When the concentration of at least one associated gas changes between the data measured at the upstream measuring point and the data measured at the downstream measuring point, it means that the source of carbon monoxide corresponding to the associated gas with the concentration change is located in the tunnel between the downstream measuring point and the upstream measuring point.

7. A method for tracing the source of carbon monoxide gas in a coal mine according to claim 1, characterized in that: When determining which branch tunnel each associated gas comes from, when there is only one associated gas whose concentration is not zero in the measurement data of the upstream measuring point of one branch tunnel, it means that the associated gas only comes from the branch tunnel; when there are multiple associated gas concentrations not zero in the measurement data of the upstream measuring points of multiple branch tunnels, it means that the associated gas comes from multiple branch tunnels; the content of each associated gas from each branch tunnel is calculated based on the air volume of each branch tunnel, and for the branch tunnels with at least one associated gas concentration not zero, the source of carbon monoxide is traced upstream in the direction against the wind flow.

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