Method and device for determining adjustment strategy of gas in coal seam and storage medium

Abstract

The invention discloses a method and device for determining an adjustment strategy of gas in a coal seam and a storage medium. The method comprises the steps that the temperature of gas in a coal seam is obtained; based on the temperature, a target natural state of the coal seam is determined, and the target natural state is used for indicating the combustion condition of the coal seam; the gas concentration of gas in the coal seam is obtained, the inert injection proportion is determined based on the gas concentration and the target natural state, and the inert injection proportion is used for indicating the proportion of gas injected into the coal seam; based on the gas concentration and the inert injection proportion, an adjustment strategy of the coal seam is determined, and the adjustment strategy is used for representing a rule for adjusting the gas proportion in the coal seam. The technical problem that the regulation and control strategy of the coal bed gas cannot be accurately determined is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal seam mining, and in particular to a method, device and storage medium for determining an adjustment strategy for gas in a coal seam. Background Art

[0002] At present, during the mining of shallow and close-range coal seams, complex goafs are easily formed. It is difficult to carry out effective fire prevention and extinguishing measures in the overlying goafs, spontaneous fires are prone to occur, and there are problems such as leakage of toxic and harmful gases. Injection of inert gas to prevent and extinguish fires is one of the most common and effective methods to prevent and control spontaneous combustion of coal. Currently, the commonly used inert gases are CO2 and N2. There are many defects in the prevention and control of single inert gas. Among them, N2 has a small density and is easily disturbed by wind flow, and the inerting effect is not long-lasting. CO2 has a large density and poor fluidity. In order to improve the inerting effect, a mixed gas of CO2 and N2 is selected for injection of inert gas to prevent and extinguish fires.

[0003] In the related technology, the ratio of inert gas is difficult to determine, and during the implementation process, the injection of mixed gas of CO2 and N2 can easily cause the problem of excessive CO2 and too low O2 concentration at the working face. Therefore, there is a technical problem that the control strategy of coalbed gas cannot be accurately determined.

[0004] With respect to the above-mentioned technical problem of being unable to accurately determine the control strategy for coalbed methane, no effective solution has been proposed so far. Summary of the invention

[0005] The embodiments of the present invention provide a method, device and storage medium for determining an adjustment strategy for gas in a coal seam, so as to at least solve the technical problem that the control strategy for coal seam gas cannot be accurately determined.

[0006] According to one aspect of an embodiment of the present invention, a method for determining an adjustment strategy for gas in a coal seam is provided. The method may include: obtaining the temperature of the gas in the coal seam; determining a target natural state of the coal seam based on the temperature, wherein the target natural state is used to indicate the combustion condition of the coal seam; obtaining the gas concentration of the gas in the coal seam, and determining an injection-inert ratio based on the gas concentration and the target natural state, wherein the injection-inert ratio is used to indicate the ratio of gas injected into the coal seam; determining an adjustment strategy for the coal seam based on the gas concentration and the injection-inert ratio, wherein the adjustment strategy is used to indicate a rule for adjusting the gas ratio in the coal seam.

[0007] Optionally, the method for determining the adjustment strategy of gas in the coal seam also includes: obtaining a preset natural state of the coal seam, wherein the preset natural state is used to represent the combustion stage obtained by pre-testing a coal sample of the coal seam; and determining the temperature thresholds corresponding to different combustion stages in the preset natural state.

[0008] Optionally, determining a target natural state of the coal seam based on the temperature includes: in response to the temperature being greater than a temperature threshold, determining a preset natural state corresponding to the temperature threshold as the target natural state of the coal seam.

[0009] Optionally, the injection ratio is determined based on the gas concentration and the target natural state, including: determining the initial gas ratio of the coal seam based on the gas concentration; determining the injection ratio of the coal seam based on the initial gas ratio and the target natural state.

[0010] Optionally, based on the gas concentration and the inertia injection ratio, an adjustment strategy for the coal seam is determined, including: based on the gas concentration, determining the gas adjustment strategy for the coal seam, wherein the gas adjustment strategy is used to indicate a reduction in the gas injection ratio or the extraction of gas; integrating the gas adjustment strategy and the inertia injection ratio to obtain the adjustment strategy for the coal seam.

[0011] Optionally, based on the gas concentration, a gas adjustment strategy for the coal seam is determined, including: in response to the gas concentration being greater than a critical gas concentration threshold, determining the gas adjustment strategy to be a first adjustment strategy, wherein the first adjustment strategy is to reduce the gas injection ratio, wherein the critical gas concentration threshold is used to indicate that the gas concentration has reached a critical point; in response to the gas concentration being greater than a safe gas concentration threshold, determining the gas adjustment strategy to be a second adjustment strategy, wherein the second adjustment strategy is to extract gas, wherein the safe gas concentration threshold is used to indicate that the gas concentration exceeds a safe range.

[0012] According to another aspect of an embodiment of the present invention, a device for determining an adjustment strategy for gas in a coal seam is also provided. The device may include: an acquisition unit for acquiring the temperature of the gas in the coal seam; a first determination module for determining the target natural state of the coal seam based on the temperature, wherein the target natural state is used to indicate the combustion condition of the coal seam; a second determination module for acquiring the gas concentration of the gas in the coal seam, and determining the injection ratio based on the gas concentration and the target natural state, wherein the injection ratio is used to indicate the ratio of gas injected into the coal seam; a third determination module for determining the adjustment strategy for the coal seam based on the gas concentration and the injection ratio, wherein the adjustment strategy is used to indicate the rule for adjusting the gas ratio in the coal seam.

[0013] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein when the program is executed by a processor, the device where the storage medium is located is controlled to execute the method for determining the adjustment strategy for gas in the coal seam in an embodiment of the present invention.

[0014] According to another aspect of the embodiment of the present invention, a processor is provided, which is used to run a program, wherein when the program is run, the method for determining the adjustment strategy of gas in the coal seam in the embodiment of the present invention is executed.

[0015] According to another aspect of the embodiment of the present invention, a computer program product is provided, which includes computer instructions, and when the computer instructions are executed by a processor, the method for determining the adjustment strategy of gas in the coal seam in the embodiment of the present invention is implemented.

[0016] In an embodiment of the present invention, the temperature of the gas in the coal seam is obtained; based on the temperature, the target natural state of the coal seam is determined, wherein the target natural state is used to indicate the combustion condition of the coal seam; the gas concentration of the gas in the coal seam is obtained, and based on the gas concentration and the target natural state, the injection ratio is determined, wherein the injection ratio is used to indicate the ratio of gas injected into the coal seam; based on the gas concentration and the injection ratio, the adjustment strategy of the coal seam is determined, wherein the adjustment strategy is used to indicate the rule for adjusting the gas ratio in the coal seam. That is, the embodiment of the present invention determines the temperature and concentration of the gas in the coal seam, determines the injection ratio according to the gas temperature and the gas concentration, and thus determines the adjustment strategy of the coal seam, thereby solving the technical problem of being unable to accurately determine the control strategy of the coal seam gas, and achieving the technical effect of accurately determining the control strategy of the coal seam gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 is a flow chart of a method for determining an adjustment strategy for gas in a coal seam according to an embodiment of the present invention;

[0019] Figure 2 It is a flow chart of a composite inert gas intelligent fire prevention and extinguishing method for goaf areas of shallow buried and close-range coal seam groups according to an embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of a pipeline arrangement in an upper goaf of a coal seam group according to an embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of a pipeline arrangement for mining a coal seam in a lower layer of a coal seam group according to an embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of gas migration according to an embodiment of the present invention;

[0023] Figure 6 is a schematic diagram of the division of the primary and secondary oxidation coal spontaneous combustion stages according to an embodiment of the present invention;

[0024] Figure 7 It is a schematic diagram of a device for determining an adjustment strategy for gas in a coal seam according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, functional component or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, functional components or devices.

[0027] According to an embodiment of the present invention, an embodiment of a method for determining an adjustment strategy for gas in a coal seam is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0028] Figure 1 is a flow chart of a method for determining an adjustment strategy for gas in a coal seam according to an embodiment of the present invention. Figure 1 As shown, the method may include the following steps:

[0029] Step S101, obtaining the temperature of gas in the coal seam.

[0030] In the technical solution provided in the above step S101 of the present invention, the coal seam can be divided into an upper coal seam and a mining seam, and the coal seam can also be called a coal seam group.

[0031] In this embodiment, the temperature of the gas in the coal seam is obtained, for example, by laying detection devices in different coal seams, and the temperature of the gas in the coal seam is obtained. This is only an example and does not limit the specific method of obtaining the temperature of the gas in the coal seam.

[0032] For example, an upper temperature detection system, an upper bundle pipe monitoring system and an upper inerting pipeline are laid in the left and right tunnel extension directions of the upper coal seam of the coal seam group, and a goaf is formed after the upper coal seam is mined; a lower temperature detection system, a lower bundle pipe monitoring system and a lower inerting pipeline are laid along the tunnel extension direction on one side of the air intake tunnel of the currently mined coal seam in the coal seam group, and an exhaust pipeline is laid along the tunnel extension direction on one side of the return air tunnel of the currently mined coal seam in the coal seam group, so as to obtain the temperature of the gas in the coal seam according to the laid temperature detection system.

[0033] Step S102, determining the target natural state of the coal seam based on the temperature.

[0034] In the technical solution provided in the above step S102 of the present invention, the target natural state is used to indicate the combustion condition of the coal seam.

[0035] In this embodiment, after the temperature of the gas in the coal seam is obtained in step S101, the target natural state of the coal seam is determined according to the temperature. The target natural state can also be called a natural stage.

[0036] Optionally, the target natural phase may be at least: a latent period, an oxidation period, a self-heating period and a combustion period.

[0037] Optionally, the critical temperature between the latent period and the oxidation period is the adsorption temperature, the critical temperature between the oxidation period and the self-heating period is the composite temperature, and the critical temperature between the self-heating period and the combustion period is the ignition temperature.

[0038] For example, when the temperature of the gas in the coal seam reaches the adsorption temperature, it means that the coal seam is already in the oxidation period. Based on this, it can be determined that the target natural state of the coal seam is the oxidation period state.

[0039] Step S103, obtaining the gas concentration of the gas in the coal seam, and determining the injection ratio based on the gas concentration and the target natural state.

[0040] In the technical solution provided in the above step S103 of the present invention, the injection ratio is used to indicate the ratio of gas injected into the coal seam.

[0041] In this embodiment, after the target natural state of the coal seam is determined in step S102, the gas concentration of the gas in the coal seam is obtained, for example, the gas concentration of the gas in the coal seam is obtained through a detection system. This is only an illustrative example and does not limit the specific method of obtaining the gas concentration of the gas in the coal seam.

[0042] Optionally, after obtaining the gas concentration of the gas in the coal seam, the injection ratio is determined according to the gas concentration and the target natural state. For example, the injection ratio is determined according to the ratio of each gas in the gas concentration and the ratio of each gas corresponding to the gas concentration in the natural state. This is only an example and does not limit the specific method for determining the injection ratio.

[0043] For example, the ratio of each gas is extracted from the gas concentration, and the proposed ratio of each gas is compared with the preset gas ratio in the natural state, so as to determine the inertization ratio.

[0044] Step S104, determining the adjustment strategy of the coal seam based on the gas concentration and the injection ratio.

[0045] In the technical solution provided in the above step S104 of the present invention, the adjustment strategy is used to represent the rule for adjusting the gas ratio in the coal seam.

[0046] In this embodiment, after the injection ratio is determined in step S103, the adjustment strategy of the coal seam is determined according to the gas concentration and the injection ratio.

[0047] Optionally, the gas adjustment strategy is determined according to the gas concentration, for example, the gas concentration is compared with a gas concentration threshold to determine the gas adjustment strategy.

[0048] Optionally, the gas adjustment strategy may be to reduce gas injection or extract gas. After the gas adjustment strategy is determined, the gas adjustment strategy and the injection ratio are integrated to determine the coal seam adjustment strategy.

[0049] Optionally, by setting the inerting ratio, the inerting effect can be improved and the occurrence of problems such as gas exceeding the limit or gas concentration being too low can be reduced.

[0050] It should be noted that the above embodiment can be implemented by a coal crushing and feeding control system.

[0051] In the above steps S101 to S104 of the present invention, the temperature of the gas in the coal seam is obtained; based on the temperature, the target natural state of the coal seam is determined, wherein the target natural state is used to indicate the combustion condition of the coal seam; the gas concentration of the gas in the coal seam is obtained, and based on the gas concentration and the target natural state, the injection ratio is determined, wherein the injection ratio is used to indicate the ratio of gas injected into the coal seam; based on the gas concentration and the injection ratio, the adjustment strategy of the coal seam is determined, wherein the adjustment strategy is used to indicate the rule for adjusting the gas ratio in the coal seam. That is, the embodiment of the present invention determines the temperature and concentration of the gas in the coal seam, determines the injection ratio according to the gas temperature and the gas concentration, and thus determines the adjustment strategy of the coal seam, thereby solving the technical problem of being unable to accurately determine the control strategy of the coal seam gas, and achieving the technical effect of accurately determining the control strategy of the coal seam gas.

[0052] The above method of this embodiment is further introduced below.

[0053] As an optional implementation method, the method for determining the adjustment strategy of gas in a coal seam also includes: obtaining a preset natural state of the coal seam, wherein the preset natural state is used to represent the combustion stage obtained by pre-testing a coal sample of the coal seam; and determining the temperature thresholds corresponding to different combustion stages in the preset natural state.

[0054] In this embodiment, a preset natural state of the coal seam is obtained, wherein the preset natural state may also be referred to as a preset natural stage, and the preset natural stage may at least include a latent period, an oxidation period, a self-heating period, and a combustion period.

[0055] Optionally, after obtaining the preset natural state of the coal seam, the temperature thresholds corresponding to different combustion stages in the preset natural state are determined. For example, the temperature threshold may also be the critical temperature of the latent period and the oxidation period: the temperature value corresponding to the adsorption temperature.

[0056] Optionally, after determining different temperature thresholds, the natural stage of the coal seam is further determined according to the temperature thresholds, thereby improving the accuracy of determining the coal seam adjustment strategy.

[0057] As an optional implementation manner, step S102, based on the temperature, determines the target natural state of the coal seam, including: in response to the temperature being greater than a temperature threshold, determining a preset natural state corresponding to the temperature threshold as the target natural state of the coal seam.

[0058] In this embodiment, when the temperature is greater than the temperature threshold, that is, the state of the coal seam exceeds the state corresponding to the temperature threshold, based on this, the preset natural state corresponding to the temperature threshold can be determined as the target natural state of the coal seam.

[0059] For example, assuming that the critical temperature between the latent period and the oxidation period is the adsorption temperature, the adsorption temperature is 252°C, and the obtained temperature of the coal seam is 260°C. Since 260°C>252°C, that is, the temperature of the coal seam is greater than the temperature threshold, based on this, it can be determined that the target natural state of the coal seam is the oxidation period state.

[0060] As an optional implementation method, the injection ratio is determined based on the gas concentration and the target natural state, including: determining the initial gas ratio of the coal seam based on the gas concentration; determining the injection ratio of the coal seam based on the initial gas ratio and the target natural state.

[0061] In this embodiment, the ratio of each gas is extracted from the gas concentration, and then the ratio of each gas is integrated to determine the initial gas ratio of the coal seam.

[0062] Optionally, after determining the initial gas ratio of the coal seam, the inertia injection ratio of the coal seam is determined according to the initial gas ratio and the target natural state. For example, the reaction law of coal seam gas is analyzed to compare the initial gas ratio with the gas ratio in the target natural state to determine the inertia injection ratio of the coal seam.

[0063] Optionally, the gas injection ratio is adjusted according to the inertia injection ratio of the coal seam to ensure safe and stable mining of the coal seam.

[0064] As an optional implementation method, the adjustment strategy of the coal seam is determined based on the gas concentration and the injection ratio, including: determining the gas adjustment strategy of the coal seam based on the gas concentration, wherein the gas adjustment strategy is used to indicate a reduction in the gas injection ratio or the extraction of gas; integrating the gas adjustment strategy and the injection ratio to obtain the adjustment strategy of the coal seam.

[0065] In this embodiment, the gas concentration is compared with the gas concentration threshold, and the gas adjustment strategy of the coal seam is determined based on the comparison result.

[0066] Optionally, after determining the gas adjustment strategy, the gas adjustment strategy is integrated with the inertia injection ratio to obtain the coal seam adjustment strategy, for example, reducing the gas injection ratio or extracting gas according to the inertia injection ratio.

[0067] As an optional implementation method, a gas adjustment strategy for a coal seam is determined based on gas concentration, including: in response to the gas concentration being greater than a critical gas concentration threshold, determining the gas adjustment strategy to be a first adjustment strategy, wherein the first adjustment strategy is to reduce the gas injection ratio, wherein the critical gas concentration threshold is used to indicate that the gas concentration has reached a critical point; in response to the gas concentration being greater than a safety gas concentration threshold, determining the gas adjustment strategy to be a second adjustment strategy, wherein the second adjustment strategy is to extract gas, wherein the safety gas concentration threshold is used to indicate that the gas concentration exceeds a safety range.

[0068] In this embodiment, when the gas concentration is greater than the critical gas concentration threshold, it indicates that the gas in the coal seam is approaching the limit. Based on this, the gas regulation strategy is determined to be the first adjustment strategy, that is, reducing the gas injection ratio.

[0069] Optionally, when the gas concentration is greater than the safety gas concentration threshold, it indicates that the gas in the coal seam has reached a safety limit. Based on this, the gas regulation strategy is determined to be the second adjustment strategy, that is, extracting the gas.

[0070] Optionally, by determining different gas adjustment strategies, the inerting effect can be improved and the occurrence of problems causing gas over-limit and gas concentration being too low can be reduced.

[0071] It should be noted that the above embodiment can be implemented by a coal crushing and feeding control system.

[0072] In this embodiment, the temperature of the gas in the coal seam is obtained; based on the temperature, the target natural state of the coal seam is determined, wherein the target natural state is used to indicate the combustion condition of the coal seam; the gas concentration of the gas in the coal seam is obtained, and based on the gas concentration and the target natural state, the injection ratio is determined, wherein the injection ratio is used to indicate the ratio of gas injected into the coal seam; based on the gas concentration and the injection ratio, the adjustment strategy of the coal seam is determined, wherein the adjustment strategy is used to indicate the rule for adjusting the gas ratio in the coal seam. That is, the embodiment of the present invention determines the temperature and concentration of the gas in the coal seam, determines the injection ratio according to the gas temperature and the gas concentration, and thus determines the adjustment strategy of the coal seam, thereby solving the technical problem of being unable to accurately determine the control strategy of the coal seam gas, and achieving the technical effect of accurately determining the control strategy of the coal seam gas.

[0073] The technical solution of the embodiment of the present invention is illustrated below in conjunction with preferred implementation modes.

[0074] At present, during the mining of shallow and close-range coal seams, complex goafs are easily formed. It is difficult to carry out effective fire prevention and extinguishing measures in the overlying goafs, spontaneous fires are prone to occur, and there are problems such as leakage of toxic and harmful gases. Injection of inert gas to prevent and extinguish fires is one of the most common and effective methods to prevent and control spontaneous combustion of coal. Currently, the commonly used inert gases are CO2 and N2. There are many defects in the prevention and control of single inert gas. Among them, N2 has a small density and is easily disturbed by wind flow, and the inerting effect is not long-lasting. CO2 has a large density and poor fluidity. In order to improve the inerting effect, a mixed gas of CO2 and N2 is selected for injection of inert gas to prevent and extinguish fires.

[0075] In the related art, the ratio of inert gas is difficult to determine, and during the implementation process, the injection of mixed gas of CO2 and N2 can easily cause the problem of CO2 exceeding the limit and O2 concentration being too low at the working face. Therefore, there is a technical problem that the control strategy of coalbed gas cannot be accurately determined. With respect to the above-mentioned technical problem that the control strategy of coalbed gas cannot be accurately determined, no effective solution has been proposed.

[0076] However, an embodiment of the present invention proposes a composite inert gas intelligent fire prevention and extinguishing method for goaf areas of shallow buried and close-range coal seams. By installing temperature detection systems in different coal seams, the gas concentration and temperature conditions are detected in real time according to the detection system to obtain monitoring data, and then the inert gas injection ratio is regulated according to the monitoring data, which solves the technical problem of being unable to accurately determine the control strategy of coal seam gas and achieves the technical effect of accurately determining the control strategy of coal seam gas.

[0077] The embodiments of the present invention are further described below.

[0078] Figure 2The flowchart of a composite inert gas intelligent fire prevention and extinguishing method for goaf areas of shallow buried and close-range coal seams according to an embodiment of the present invention includes the following steps:

[0079] Step S201, installing an upper layer temperature detection system, an upper layer bundle pipe monitoring system and an upper layer inerting pipeline in the upper coal seam of the coal seam group.

[0080] In this embodiment, an upper temperature detection system, an upper bundle pipe monitoring system and an upper inert injection pipeline are installed in the extension direction of the left and right tunnels of the upper coal seam of the coal seam group, and a goaf is formed after the upper coal seam is mined.

[0081] Optionally, the upper bundle pipe monitoring system and the upper inerting pipeline are symmetrically arranged in the tunnel of the goaf.

[0082] Optionally, the upper temperature detection systems are evenly spaced on the upper bundle tube monitoring system, and the upper bundle tube monitoring system is arranged outside the upper inerting pipeline.

[0083] Step S202, laying a lower layer temperature detection system, a lower layer bundle pipe monitoring system and a lower layer inerting pipeline in the current mining coal seam of the coal seam group.

[0084] In this embodiment, a lower layer temperature detection system, a lower layer bundle pipe monitoring system and a lower layer inerting pipeline are installed along the extension direction of the tunnel on one side of the air intake tunnel of the currently mined coal seam in the coal seam group, and an exhaust pipeline is installed along the extension direction of the tunnel on one side of the return air tunnel of the currently mined coal seam in the coal seam group.

[0085] Optionally, the lower layer bundle pipe monitoring system and the gas extraction pipeline are symmetrically arranged in the tunnel of the current coal seam being mined.

[0086] Optionally, the lower layer temperature detection systems are evenly spaced on the lower layer bundle tube monitoring system, and the lower layer bundle tube monitoring system is arranged outside the lower layer inerting pipeline.

[0087] Step S203, taking different coal samples from the upper goaf and the current mining coal seam, testing the spontaneous combustion index of the coal samples, and determining the injection ratio at different stages.

[0088] In this embodiment, different coal samples are taken from the upper goaf and the currently mined coal seam, and the spontaneous combustion indicators of the coal samples are tested. The coal spontaneous combustion stages of the upper goaf and the currently mined coal seam are divided into multiple stages, and the injection ratios of different stages are determined.

[0089] Optionally, the coal spontaneous combustion stage is divided into a latent period, an oxidation period, a self-heating period and a combustion period.

[0090] Optionally, the critical temperature of the latent period and the oxidation period is the adsorption temperature, the critical temperature of the oxidation period and the self-heating period is the composite temperature, the critical temperature of the self-heating period and the combustion period is the ignition point temperature, and the upper inert injection pipeline and the lower inert injection pipeline respectively perform inert injection with corresponding composite inert gas ratio according to the temperature feedback from the upper temperature detection system and the lower temperature detection system.

[0091] Optionally, the spontaneous combustion stage of coal in the goaf is the secondary oxidation stage, and the spontaneous combustion stage of coal in the currently mined coal seam is the primary oxidation stage.

[0092] Step S204, real-time detection of the gas concentration and temperature of the goaf is performed, and the injection ratio is regulated.

[0093] In this embodiment, the goaf is protected from spontaneous combustion of coal, the upper inerting pipeline is continuously inerted, and the upper temperature detection system and the upper bundle pipe monitoring system perform real-time detection of the gas concentration and temperature conditions in the goaf. When the monitoring data reaches the different stage thresholds divided in the middle, the inerting ratio is immediately adjusted.

[0094] Step S205, real-time detection of the gas concentration and temperature of the current mined coal seam is performed, and the injection ratio is regulated.

[0095] In this embodiment, the coal spontaneous combustion prevention and control is carried out on the currently mined coal seam, and the gas concentration and temperature conditions of the currently mined coal seam are detected in real time by the lower layer temperature detection system and the lower layer bundle pipe monitoring system. When the monitoring data reaches the threshold values ​​of different stages, the injection ratio is immediately adjusted; when the temperature of the currently mined coal seam does not continue to rise and the gas is normal, the lower layer injection pipeline is intermittently injected.

[0096] Optionally, the lower bundle pipe monitoring system is used to conduct real-time monitoring of the CO2 concentration and O2 concentration of the currently mined coal seam. When the CO2 of the working face approaches the critical value, the CO2 injection ratio is immediately reduced to prevent the CO2 of the working face from exceeding the limit. Once the CO2 exceeds the limit, emergency response measures are immediately taken, and the exhaust pipeline starts working to extract part of the composite inert gas of the working face. At the same time, the toxic and harmful gases leaking from the upper goaf are discharged to the working face to ensure that the O2 concentration of the working face is within the normal range.

[0097] Optionally, the temperature of the currently mined coal seam is monitored in real time using the lower layer temperature detection system. When abnormal temperature data is detected at a certain position, the inert gas injection port near the position starts to deliver composite inert gas. The proportion of the composite inert gas is regulated according to the coal spontaneous combustion stage in step 2, and the working face is injected with non-continuous inert gas. When the CO2 of the working face approaches the critical value and the temperature of the working face continues to rise, emergency response measures are taken and the exhaust pipeline starts working. If the coal spontaneous combustion process still cannot be controlled, the personnel are immediately notified to evacuate.

[0098] Optionally, different injection methods can be adopted according to the different characteristics of the upper and lower coal seams. Continuous injection is adopted in the upper goaf, and discontinuous injection is adopted in the lower mined coal seam. This can not only ensure the fire prevention and extinguishing effect of the upper layer, but also reduce the risk of too low O2 concentration in the current mined coal seam to a certain extent.

[0099] Optionally, the upper goaf faces the risk of secondary oxidation, the characteristic temperature of secondary oxidation is lower than the primary oxidation temperature, and the risk of spontaneous combustion is high. The upper goaf and the currently mined coal seam are divided into the spontaneous combustion stages according to primary oxidation and secondary oxidation, respectively, and graded control is carried out to improve the efficiency of fire prevention and extinguishing.

[0100] Optionally, a detection system is arranged to intelligently monitor the gas concentration and temperature, and an inerting pipeline with an adjustable inerting ratio is set up to improve the inerting effect and reduce the occurrence of problems such as CO2 exceeding the limit and O2 concentration being too low. This can effectively prevent the spontaneous combustion of coal on the working face and ensure that the O2 concentration on the working face is maintained within a normal range.

[0101] Figure 3 It is a schematic diagram of a pipeline arrangement of an upper goaf of a coal seam group according to an embodiment of the present invention. The pipeline arrangement 300 of the upper goaf of the coal seam group includes: an upper temperature detection system 301, an upper bundle pipe monitoring system 302, an upper inerting pipeline 303 and an upper goaf 304.

[0102] In this embodiment, the upper bundle pipe monitoring system 302 and the upper inert injection pipeline 303 are symmetrically arranged in the tunnel of the upper goaf 304. The upper temperature detection system 301 is evenly spaced on the upper bundle pipe monitoring system 302, and the upper bundle pipe monitoring system 302 is arranged outside the upper inert injection pipeline 303.

[0103] Figure 4 It is a schematic diagram of the pipeline layout of the lower mining coal seam of a coal seam group according to an embodiment of the present invention. The pipeline layout 400 of the lower mining coal seam of the coal seam group includes: a lower temperature detection system 401, a lower bundle pipe monitoring system 402, a lower inerting pipeline 403, an air intake lane 404, an exhaust pipeline 405, a return air lane 406, and an unmined coal seam 407.

[0104] In this embodiment, the lower layer bundle pipe monitoring system 402 and the gas extraction pipeline 405 are symmetrically arranged in the tunnel of the current mining coal seam. The lower layer temperature detection system 401 is evenly spaced on the lower layer bundle pipe monitoring system 402, and the lower layer bundle pipe monitoring system 402 is arranged outside the lower layer inerting pipeline 403.

[0105] Figure 5It is a schematic diagram of gas migration according to an embodiment of the present invention. It is for intelligent detection of gas concentration and temperature, and adjustment of the ratio of mixed gas to improve the efficiency of fire prevention and extinguishing. At the same time, it has emergency response measures for low O2 concentration. An upper temperature detection system 301, an upper bundle pipe monitoring system 302 and an upper inerting pipeline 303 are laid in the extension direction of the left and right tunnels of the upper coal seam of the coal seam group. After the upper coal seam is mined, an upper goaf 304 is formed. 502 represents toxic gas.

[0106] In this embodiment, a lower layer temperature detection system 401, a lower layer bundle pipe monitoring system 402 and a lower layer inerting pipeline 403 are installed on one side of the air inlet tunnel 404 of the currently mined coal seam in the coal seam group along the extension direction of the tunnel, and an exhaust pipeline 405 is installed on one side of the return air tunnel 10 of the currently mined coal seam in the coal seam group along the extension direction of the tunnel.

[0107] Optionally, coal samples are taken on site from the upper goaf 304 and the currently mined coal seam working face 501. Since the spontaneous combustion stage of the coal in the upper goaf 304 is the secondary oxidation stage, and the spontaneous combustion stage of the coal in the currently mined coal seam 501 is the primary oxidation stage, and the ignition point of the secondary oxidation stage is lower than that of the primary oxidation stage, the spontaneous combustion indicators of the coal samples are tested separately. Figure 6 Schematic diagram of the division of the primary and secondary oxidation coal spontaneous combustion stages according to an embodiment of the present invention, such as Figure 6 As shown, the coal spontaneous combustion stage of the upper goaf 304 and the current mining coal seam 501 is divided into multiple stages, and the injection ratio of the inert gas in different stages is determined. The coal spontaneous combustion stage is divided into a latent period, an oxidation period, a self-heating period, and a combustion period. The critical temperature of the latent period and the oxidation period is the adsorption temperature, the critical temperature of the oxidation period and the self-heating period is the composite temperature, and the critical temperature of the self-heating period and the combustion period is the ignition point temperature. The upper layer inert gas injection pipeline 303 and the lower layer inert gas injection pipeline 403 respectively perform inert gas injection of the corresponding composite inert gas ratio according to the temperature feedback from the upper layer temperature detection system 301 and the lower layer temperature detection system 401.

[0108] Optionally, Table 1 is a composite inert gas ratio table, for example, the inert gas injection ratio in the latent stage is 9:1.

[0109] Table 1 Composite inert gas ratio table

[0110] Natural stage of coal <![CDATA[Composite inert gas injection ratio (N2:CO2)]]> Latent stage 9:1 Compound stage 8:2 Self-heating stage 7:3 Active phase 6:4 Pyrolysis stage 5:5 Fission stage 4:6 Combustion stage 3:7

[0111] Optionally, the upper goaf 304 is subjected to prevention and control of coal spontaneous combustion, the upper inerting pipeline 303 performs continuous inerting, and the upper temperature detection system 301 and the upper bundle tube monitoring system 302 perform real-time detection of the gas concentration and temperature conditions of the upper goaf 304. When the monitoring data reaches the different stage thresholds divided in step two, the inerting ratio is immediately adjusted.

[0112] Optionally, the coal spontaneous combustion prevention is carried out on the currently mined coal seam, and the gas concentration and temperature of the currently mined coal seam are detected in real time by the lower layer temperature detection system 401 and the lower layer bundle pipe monitoring system 402. When the monitoring data reaches the different stage thresholds divided in step 2, the injection ratio is immediately adjusted. When the temperature of the currently mined coal seam does not continue to rise and the gas is normal, the lower layer injection pipeline 403 performs intermittent injection.

[0113] Optionally, the CO2 concentration and O2 concentration of the currently mined coal seam are monitored in real time by using the lower bundle pipe monitoring system 402. When the CO2 of the working face approaches the critical value, the injection ratio of CO2 is immediately reduced to prevent the CO2 of the working face from exceeding the limit. Once the CO2 exceeds the limit, emergency response measures are immediately taken, and the exhaust pipeline 405 starts to work to extract part of the composite inert gas of the working face to ensure that the O2 concentration of the working face is within the normal range, and at the same time, the toxic and harmful gases leaking from the upper goaf are discharged from the working face.

[0114] Optionally, the lower layer temperature detection system 401 is used to monitor the temperature of the currently mined coal seam in real time. When abnormal temperature data is detected at a certain position, the inert gas injection port near the position starts to deliver composite inert gas. The proportion of composite inert gas is adjusted according to the coal spontaneous combustion stage in step 2, and the working face is inertly injected discontinuously. When the CO2 of the working face approaches the critical value and the temperature of the working face continues to rise, and the extraction measures are ineffective, the personnel are immediately notified to evacuate.

[0115] In this embodiment, by installing temperature detection systems in different coal seams, the gas concentration and temperature conditions are detected in real time according to the detection system to obtain monitoring data, and then the injection ratio is adjusted according to the monitoring data, which solves the technical problem of being unable to accurately determine the control strategy of coal seam gas and achieves the technical effect of accurately determining the control strategy of coal seam gas.

[0116] According to an embodiment of the present invention, a device for determining an adjustment strategy for gas in a coal seam is also provided. It should be noted that the device for determining an adjustment strategy for gas in a coal seam can be used to execute the method for determining an adjustment strategy for gas in a coal seam in the method embodiment.

[0117] Figure 7 FIG. 1 is a schematic diagram of a device for determining an adjustment strategy for gas in a coal seam according to an embodiment of the present invention. Figure 7 As shown, the device 700 for determining the adjustment strategy of gas in the coal seam may include: an acquisition unit 701 , a first determination unit 702 , a second determination unit 703 and a third determination unit 704 .

[0118] The acquisition unit 701 is used to acquire the temperature of the gas in the coal seam.

[0119] The first determination unit 702 is used to determine a target natural state of the coal seam based on the temperature, wherein the target natural state is used to indicate a combustion condition of the coal seam.

[0120] The second determination unit 703 is used to obtain the gas concentration of the gas in the coal seam, and determine the injection ratio based on the gas concentration and the target natural state, wherein the injection ratio is used to indicate the ratio of gas injected into the coal seam.

[0121] The third determination unit 704 is used to determine the adjustment strategy of the coal seam based on the gas concentration and the injection ratio, wherein the adjustment strategy is used to represent the rule for adjusting the gas ratio in the coal seam.

[0122] Optionally, the device 700 for determining the adjustment strategy of gas in the coal seam may also include: a first acquisition unit, used to obtain a preset natural state of the coal seam, wherein the preset natural state is used to represent the combustion stage obtained by pre-testing a coal sample of the coal seam; and a fourth determination unit, used to determine the temperature thresholds corresponding to different combustion stages in the preset natural state.

[0123] Optionally, the fourth determination unit may include: a first determination module, configured to determine, in response to the temperature being greater than the temperature threshold, a preset natural state corresponding to the temperature threshold as a target natural state of the coal seam.

[0124] Optionally, the second determination unit 703 may include: a second determination module for determining an initial gas ratio of the coal seam based on gas concentration; and a third determination module for determining an injection inertia ratio of the coal seam based on the initial gas ratio and a target natural state.

[0125] Optionally, the third determination unit 704 may include: a fourth determination module, used to determine the gas adjustment strategy of the coal seam based on the gas concentration, wherein the gas adjustment strategy is used to indicate a reduction in the gas injection ratio or the extraction of gas; an integration module, used to integrate the gas adjustment strategy with the injection ratio to obtain the adjustment strategy of the coal seam.

[0126] Optionally, the third determination unit 704 may include: a fifth determination module, used to determine that the gas regulation strategy is a first adjustment strategy in response to the gas concentration being greater than a critical gas concentration threshold, wherein the first adjustment strategy is to reduce the gas injection ratio, wherein the critical gas concentration threshold is used to indicate that the gas concentration has reached a critical point; a sixth determination module, used to determine that the gas regulation strategy is a second adjustment strategy in response to the gas concentration being greater than a safety gas concentration threshold, wherein the second adjustment strategy is to extract gas, wherein the safety gas concentration threshold is used to indicate that the gas concentration exceeds a safety range.

[0127] In this embodiment, the temperature of the gas in the coal seam is obtained; based on the temperature, the target natural state of the coal seam is determined, wherein the target natural state is used to indicate the combustion condition of the coal seam; the gas concentration of the gas in the coal seam is obtained, and based on the gas concentration and the target natural state, the injection ratio is determined, wherein the injection ratio is used to indicate the ratio of gas injected into the coal seam; based on the gas concentration and the injection ratio, the adjustment strategy of the coal seam is determined, wherein the adjustment strategy is used to indicate the rule for adjusting the gas ratio in the coal seam. That is, the embodiment of the present invention determines the temperature and concentration of the gas in the coal seam, determines the injection ratio according to the gas temperature and the gas concentration, and thus determines the adjustment strategy of the coal seam, thereby solving the technical problem of being unable to accurately determine the control strategy of the coal seam gas, and achieving the technical effect of accurately determining the control strategy of the coal seam gas.

[0128] According to an embodiment of the present invention, a computer-readable storage medium is further provided, the storage medium comprising a stored program, wherein the program executes the method for determining the adjustment strategy for gas in the coal seam in the method embodiment.

[0129] According to an embodiment of the present invention, a processor is further provided. The processor is used to run a program, wherein when the program is run, the method for determining the adjustment strategy for gas in the coal seam in the method embodiment is executed.

[0130] According to an embodiment of the present invention, a computer program product is also provided. The computer program product includes computer instructions. When the computer instructions are executed by a processor, the method for determining the adjustment strategy of gas in the coal seam in the method embodiment is implemented.

[0131] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0132] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0133] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0134] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0135] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0136] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent functional component, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software functional component, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc., which can store program codes.

[0137] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for determining a gas adjustment strategy in a coal seam, characterized in that: include: Obtain the temperature of the gas in the coal seam; Based on the temperature, determining a target natural state of the coal seam, wherein the target natural state is used to indicate a combustion condition of the coal seam; Acquiring the gas concentration of the gas in the coal seam, and determining an injection-inertia ratio based on the gas concentration and the target natural state, wherein the injection-inertia ratio is used to indicate a ratio of gas injected into the coal seam; Based on the gas concentration and the inertia injection ratio, an adjustment strategy for the coal seam is determined, wherein the adjustment strategy is used to represent a rule for adjusting the gas ratio in the coal seam.

2. The method according to claim 1, characterized in that The method further comprises: Acquiring a preset natural state of the coal seam, wherein the preset natural state is used to represent a combustion stage obtained by pre-testing a coal sample of the coal seam; Determine the temperature thresholds corresponding to different combustion stages in the preset natural state.

3. The method according to claim 2, characterized in that Based on the temperature, determining a target natural state of the coal seam includes: In response to the temperature being greater than the temperature threshold, a preset natural state corresponding to the temperature threshold is determined as a target natural state of the coal seam.

4. The method according to claim 1, characterized in that Based on the gas concentration and the target natural state, determining the injection inertia ratio includes: determining an initial gas ratio of the coal seam based on the gas concentration; The injection inertia ratio of the coal seam is determined based on the initial gas ratio and the target natural state.

5. The method according to claim 1, characterized in that Based on the gas concentration and the injection ratio, an adjustment strategy for the coal seam is determined, including: Based on the gas concentration, determining a gas adjustment strategy for the coal seam, wherein the gas adjustment strategy is used to indicate reducing the gas injection ratio or extracting the gas; The gas adjustment strategy and the inertia injection ratio are integrated to obtain the adjustment strategy of the coal seam.

6. The method according to claim 4, characterized in that Based on the gas concentration, a gas adjustment strategy for the coal seam is determined, including: In response to the gas concentration being greater than a critical gas concentration threshold, determining that the gas regulation strategy is a first adjustment strategy, wherein the first adjustment strategy is to reduce a gas injection ratio, wherein the critical gas concentration threshold is used to indicate a value at which the gas concentration reaches a critical point; In response to the gas concentration being greater than a safety gas concentration threshold, the gas regulation strategy is determined to be a second adjustment strategy, wherein the second adjustment strategy is to extract gas, wherein the safety gas concentration threshold is used to indicate a value of the gas concentration that exceeds a safety range.

7. A device for determining a gas adjustment strategy in a coal seam, characterized in that: include: An acquisition unit, used for acquiring the temperature of gas in the coal seam; A first determining unit, configured to determine a target natural state of the coal seam based on the temperature, wherein the target natural state is used to indicate a combustion condition of the coal seam; a second determination unit, configured to obtain a gas concentration of the gas in the coal seam, and determine an injection-inertia ratio based on the gas concentration and the target natural state, wherein the injection-inertia ratio is used to indicate a ratio of gas injected into the coal seam; The third determination unit is used to determine an adjustment strategy for the coal seam based on the gas concentration and the injection ratio, wherein the adjustment strategy is used to represent a rule for adjusting the gas ratio in the coal seam.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed by a processor, the device where the storage medium is located is controlled to execute the method according to any one of claims 1 to 6.

9. A processor, characterized in that: The processor is used to run a program, wherein the program executes the method according to any one of claims 1 to 6 when running.

10. A computer program product, characterized in that The computer program product comprises computer instructions, which implement the method according to any one of claims 1 to 6 when executed by a processor.

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