Goaf gas injection method, device, equipment and storage medium

Abstract

The present disclosure relates to a method, device, equipment and storage medium for gas injection into a goaf. A method for gas injection into a goaf includes: determining a target power plant flue gas injection amount to be injected into the goaf; and injecting the power plant flue gas into the goaf according to the target power plant flue gas injection amount. By injecting power plant flue gas into the goaf, nitrogen in the prior art is replaced. Power plant flue gas belongs to waste gas discharged by power plants, which not only realizes the reuse of waste gas but also avoids the high cost of nitrogen. When the oxygen concentration value in the waste gas is greater than a predetermined value, the injection of power plant flue gas is stopped to prevent coal from spontaneous combustion due to excessive oxygen content.

Description

Technical Field

[0001] The present disclosure relates to the field of electronic technology, and in particular to a method, device, equipment and storage medium for injecting gas into a goaf. Background Art

[0002] In the goaf of coal mining, the coal in the goaf often spontaneously combusts, which is a major hidden danger to coal mine safety production. In the prior art, nitrogen is injected into the goaf to prevent the spontaneous combustion of coal, but the production of nitrogen is relatively complicated and the cost is relatively high. Summary of the invention

[0003] The purpose of the present disclosure is to provide a method, device, equipment and storage medium for injecting gas into a goaf, so as to solve the problem of excessively high cost caused by injecting nitrogen into the goaf in the prior art.

[0004] In order to achieve the above object, the present disclosure provides a method for injecting gas into a goaf, comprising:

[0005] Determine the target power plant flue gas injection amount to be injected into the goaf;

[0006] Inject power plant flue gas into the goaf according to the target power plant flue gas injection amount.

[0007] Optionally, determining a target power plant flue gas injection amount to be injected into the goaf includes:

[0008] respectively determining a first theoretical power plant flue gas injection amount and a second theoretical power plant flue gas injection amount for the goaf;

[0009] The maximum value of the first theoretical power plant flue gas injection amount and the second theoretical power plant flue gas injection amount is used as the theoretical power plant flue gas injection amount of the goaf;

[0010] Determine the safety factor;

[0011] The target power plant flue gas injection amount is determined according to the safety factor and the theoretical power plant flue gas injection amount.

[0012] Optionally, the first theoretical power plant flue gas injection amount of the goaf is determined according to the following formula:

[0013] Q 1n =60×[(C1-C2)×Q0] / [(C n +C2)-1];

[0014] Among them, Q 1n is the first theoretical power plant flue gas injection amount;

[0015] Q0 is the air leakage in the oxidation zone of the goaf;

[0016] C1 is the original oxygen concentration in the oxidation zone of the goaf;

[0017] C2 is the inerting index of the oxidation zone in the goaf;

[0018] C n is the inert gas content in the flue gas of the injection power plant.

[0019] Optionally, the second theoretical power plant flue gas injection amount of the goaf is determined according to the following formula:

[0020]

[0021] Among them, Q 2n is the second theoretical power plant flue gas injection amount;

[0022] A is the annual output;

[0023] T is the annual working days;

[0024] ρ is the apparent density of coal;

[0025] C1 is the original oxygen concentration in the oxidation zone of the goaf;

[0026] C2 is the inerting index of the oxidation zone in the goaf;

[0027] η1 is the gas transmission efficiency of the pipeline;

[0028] η2 is the gas injection efficiency in the goaf.

[0029] Optionally, after determining the target power plant flue gas injection amount, the method further includes:

[0030] The following formula is used to determine the adsorption amount of carbon dioxide injected into the flue gas of the power plant by the goaf:

[0031]

[0032] in,

[0033] Q n is the flue gas injection amount of the target power plant;

[0034] C0 is the carbon dioxide content in the flue gas of the power plant;

[0035] Q is the amount of carbon dioxide injected into the flue gas of the power plant adsorbed by the goaf.

[0036] Optionally, in the process of injecting the power plant flue gas into the goaf according to the target power plant flue gas injection amount, obtaining the oxygen concentration value in the goaf;

[0037] In response to determining that the oxygen concentration value is greater than a predetermined oxygen concentration threshold, controlling the fan to start to accelerate air flow so that the oxygen concentration value decreases;

[0038] After the blower is started, in response to determining that the oxygen concentration value drops below the predetermined oxygen concentration threshold, the blower is controlled to stop.

[0039] Optionally, obtaining the oxygen concentration value in the goaf includes:

[0040] Obtaining oxygen concentration values ​​detected by oxygen concentration sensors arranged at a plurality of different positions in the goaf;

[0041] In response to determining that the oxygen concentration value is greater than a predetermined oxygen concentration threshold, controlling the fan to start includes:

[0042] In response to determining that the oxygen concentration value detected by the target oxygen concentration sensor is greater than a predetermined oxygen concentration threshold, controlling the blower corresponding to the target oxygen concentration sensor to start, wherein the target oxygen concentration sensor is any one of the plurality of oxygen concentration sensors;

[0043] After the blower is started, in response to determining that the oxygen concentration value drops below the predetermined oxygen concentration threshold, controlling the blower to stop comprises:

[0044] After the fan corresponding to the target oxygen concentration sensor is started, in response to determining that the oxygen concentration value detected by the target oxygen concentration sensor drops below the predetermined oxygen concentration threshold, the fan corresponding to the target oxygen concentration sensor is controlled to stop.

[0045] In a second aspect, the present application also discloses a goaf gas injection device, comprising:

[0046] A determination module, used to determine the target power plant flue gas injection amount to be injected into the goaf;

[0047] The flue gas injection control module is used to inject the power plant flue gas into the goaf according to the target power plant flue gas injection amount.

[0048] Optionally, the determination module is further used to: respectively determine a first theoretical power plant flue gas injection amount and a second theoretical power plant flue gas injection amount of the goaf;

[0049] The maximum value of the first theoretical power plant flue gas injection amount and the second theoretical power plant flue gas injection amount is used as the theoretical power plant flue gas injection amount of the goaf;

[0050] Determine the safety factor;

[0051] The target power plant flue gas injection amount is determined according to the safety factor and the theoretical power plant flue gas injection amount.

[0052] Optionally, the determination module includes a first determination submodule, which is used to determine a first theoretical power plant flue gas injection amount of the goaf according to the following formula:

[0053] Q 1n =60×[(C1-C2)×Q0] / [(C n +C2)-1];

[0054] Among them, Q 1n is the first theoretical power plant flue gas injection amount;

[0055] Q0 is the air leakage in the oxidation zone of the goaf;

[0056] C1 is the original oxygen concentration in the oxidation zone of the goaf;

[0057] C2 is the inerting index of the oxidation zone in the goaf;

[0058] C n is the inert gas content in the flue gas of the injection power plant.

[0059] The determination module includes a second determination submodule, which is used to determine the second power plant flue gas injection amount of the goaf according to the following formula:

[0060]

[0061] Among them, Q 2n is the second theoretical power plant flue gas injection amount;

[0062] A is the annual output;

[0063] T is the annual working days;

[0064] ρ is the apparent density of coal;

[0065] C1 is the original oxygen concentration in the oxidation zone of the goaf;

[0066] C2 is the inerting index of the oxidation zone in the goaf;

[0067] η1 is the gas transmission efficiency of the pipeline;

[0068] η2 is the gas injection efficiency in the goaf.

[0069] The determination module includes a third determination submodule, which is used to use the maximum value of the first theoretical power plant flue gas injection amount and the second theoretical power plant flue gas injection amount as the theoretical power plant flue gas injection amount of the goaf;

[0070] The fourth determination submodule is used to determine the safety factor;

[0071] The fifth determination submodule is used to determine the target power plant flue gas injection amount according to the safety factor and the theoretical power plant flue gas injection amount.

[0072] The determination module includes a sixth determination submodule, which is used to determine the adsorption amount of carbon dioxide injected into the flue gas of the power plant by the goaf using the following formula after the fifth determination submodule determines the target flue gas injection amount of the power plant:

[0073]

[0074] in,

[0075] Q n is the flue gas injection amount of the target power plant;

[0076] C0 is the carbon dioxide content in the flue gas of the power plant;

[0077] Q is the amount of carbon dioxide injected into the flue gas of the power plant adsorbed by the goaf.

[0078] Optionally, it further comprises an acquisition module, which is used to acquire the oxygen concentration value in the goaf during the process of injecting the power plant flue gas into the goaf according to the target power plant flue gas injection amount;

[0079] a fan control module, configured to control the fan to start in response to determining that the oxygen concentration value is greater than a predetermined oxygen concentration threshold value, so as to accelerate the air flow and reduce the oxygen concentration value;

[0080] After the blower is started, in response to determining that the oxygen concentration value drops below the predetermined oxygen concentration threshold, the blower is controlled to stop.

[0081] Optionally, the acquisition module is further used to acquire oxygen concentration values ​​detected by oxygen concentration sensors arranged at multiple different positions in the goaf.

[0082] Optionally, the fan control module is also used to control the start-up of the fan corresponding to the target oxygen concentration sensor in response to determining that the oxygen concentration value detected by the target oxygen concentration sensor is greater than a predetermined oxygen concentration threshold, wherein the target oxygen concentration sensor is any one of the multiple oxygen concentration sensors.

[0083] Optionally, the fan control module is also used to, after the fan corresponding to the target oxygen concentration sensor is started, in response to determining that the oxygen concentration value detected by the target oxygen concentration sensor drops below the predetermined oxygen concentration threshold, control the fan corresponding to the target oxygen concentration sensor to stop.

[0084] In a third aspect, the present application further proposes a non-temporary computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the steps of any of the above methods are implemented.

[0085] In a fourth aspect, the present application further proposes an electronic device, comprising: a memory on which a computer program is stored;

[0086] A processor is used to execute the computer program in the memory to implement the steps of any one of the methods described above.

[0087] Through the above-mentioned technical scheme, the above-mentioned technical scheme of the present application replaces the nitrogen in the prior art by injecting power plant flue gas into the goaf. The power plant flue gas belongs to the waste gas discharged by the power plant, which not only realizes the reuse of the waste gas, but also avoids the high cost of nitrogen. When the oxygen concentration value in the waste gas is greater than the predetermined value, the injection of power plant flue gas is stopped to prevent the coal from spontaneous combustion due to excessively high oxygen content.

[0088] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0089] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0090] Figure 1 is a flow chart of a method for injecting gas into a goaf provided in an exemplary embodiment;

[0091] Figure 2 is a flow chart of a method for injecting gas into a goaf provided by another exemplary embodiment;

[0092] Figure 3 is a schematic structural diagram of a laser optical fiber oxygen online monitoring system provided by an exemplary embodiment;

[0093] Figure 4 is a schematic structural diagram of a goaf gas injection device provided in an exemplary embodiment;

[0094] Figure 5 is a block diagram of an electronic device provided by an exemplary embodiment;

[0095] Figure 6 is a block diagram of another electronic device provided by an exemplary embodiment. DETAILED DESCRIPTION

[0096] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0097] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the device is located and with the authorization given by the owner of the corresponding device.

[0098] First, let me introduce the terminology in this field:

[0099] Coal mine goaf: refers to the void or cavity left after underground coal or coal gangue is mined during coal mining operations.

[0100] This application proposes a method for injecting gas into a goaf. Figure 1 A flow chart of a method for injecting gas into a goaf is shown; the method comprises the following steps:

[0101] Step S102, determining the target power plant flue gas injection amount to be injected into the goaf;

[0102] Among them, power plant flue gas is a very good fire prevention and extinguishing material in goaf areas. Component analysis of power plant flue gas found that the content of inert gases such as carbon dioxide (CO2) in the flue gas generated by coal-fired thermal power plants is more than 80%, and the oxygen content is less than 6%. Power plant flue gas is a very good inerting fire prevention and extinguishing material. Injecting power plant flue gas into underground goafs can not only use coal to seal greenhouse gases such as CO2 in power plant flue gas, but also reduce the oxygen content in the goaf to below the critical value of coal oxidation and spontaneous combustion, so that the coal in the oxidation zone in the goaf is in a non-oxidized or slowed oxidation state.

[0103] Specifically, the method is applied to the server of the central control console, and valves, flow sensors, and gas sensors are connected to the server respectively; the flow sensor is used to detect the flow of flue gas in the pipeline; the gas sensor is used to detect the concentration of gas in the pipeline or in the goaf; the gas includes but is not limited to: oxygen, carbon dioxide, methane, etc. The flue gas from the power plant is transported to the goaf through the transmission pipeline. During the injection process, the server can control the opening and closing of the valve of the pipeline, thereby controlling the injection amount of the flue gas.

[0104] Step S104, injecting power plant flue gas into the goaf according to the target power plant flue gas injection amount.

[0105] Specifically, after the flue gas from the power plant is output, it is processed in sequence by the induced draft fan, absorption tower, steam-water separator, pressure-stabilizing tank, compressor, and dryer before being injected into the underground goaf. A valve is set on the transmission pipeline, and the server controls the opening and closing of the valve to control the injection of the flue gas from the power plant or stop the injection.

[0106] The above-mentioned technical solution of the present application replaces the nitrogen in the prior art by injecting power plant flue gas into the goaf. The power plant flue gas is waste gas discharged by the power plant, which not only realizes the reuse of waste gas but also avoids the high cost of nitrogen. When the oxygen concentration value in the waste gas is greater than the predetermined value, the injection of power plant flue gas is stopped to prevent the coal from spontaneous combustion due to excessive oxygen content.

[0107] The flue gas from power plants is generally discharged into the atmosphere after purification, which increases the carbon emissions in the atmosphere. This solution can effectively reduce the CO2 emitted in the flue gas, realize waste utilization, and reduce carbon emissions. At present, most of the goafs are injected with nitrogen, sprayed with inhibitors, grouting, etc., which need to be manufactured in advance and are relatively costly. This solution can reduce the cost of mine fire prevention and extinguishing. Deep gas injection in the goaf can improve the inerting level of deep coal residues, and at the same time is beneficial to the sealing of harmful gases such as CO2 in the flue gas by the coal residues. The present invention can determine the maximum amount of flue gas injected within a certain space while ensuring the normal production of the mine, so as to achieve the dual effects of disaster prevention and sealing.

[0108] In a possible embodiment, see the attached Figure 2 Step S102, determining the target power plant flue gas injection amount to be injected into the goaf, includes the following steps:

[0109] Step S2021, respectively determining a first theoretical power plant flue gas injection amount and a second theoretical power plant flue gas injection amount for the goaf;

[0110] In one calculation method, the first theoretical power plant flue gas injection amount of the goaf can be determined using the calculation formula for nitrogen injection:

[0111] Q 1n =60×[(C1-C2)×Q0] / [(C n +C2)-1];

[0112] Among them, Q 1n is the flue gas injection amount of the first theoretical power plant;

[0113] Specifically, it is the theoretical power plant flue gas injection rate per hour.

[0114] Q0 is the air leakage in the oxidation zone of the goaf.

[0115] Specifically, according to the "Code for Fire Prevention in Coal Mine Design", the air leakage in the oxidation zone of the goaf is determined to be 5 to 20 m3 / min.

[0116] For example, the air leakage in the oxidation zone of the goaf is 5m 3 / min.

[0117] C1 is the original oxygen concentration in the oxidation zone of the goaf.

[0118] Specifically, the original oxygen concentration can be measured by using an oxygen content measurement system.

[0119] It is also possible to determine that the original oxygen concentration in the oxidation zone of the goaf is 10% to 15% according to the "Coal Mine Design Fire Protection Code".

[0120] Exemplarily, C1 is 15%.

[0121] C2 is the inerting index of the oxidation zone in the goaf.

[0122] Specifically, a coal oxidation thermogravimetric experiment was conducted on coal samples from the goaf. Under the same conditions, different concentrations of oxygen and nitrogen mixtures were introduced to observe the mass increment of the coal samples. The oxygen concentration value when the coal sample did not gain weight was the inert index of the oxidation zone in the goaf when nitrogen was injected. Injecting power plant flue gas at room temperature can reduce the physical adsorption of oxygen by coal by 25% to 30%, and the corresponding fire protection inertization index can be increased to 1.2-1.3 times the original. To ensure safety, the fire protection inertization index when injecting power plant flue gas is 1.3 times the fire protection inertization index when injecting nitrogen.

[0123] Exemplarily, C2 is 9%.

[0124] C n is the inert gas content in the flue gas of the power plant.

[0125] Among them, inert gases include nitrogen and carbon dioxide. The chromatographic analyzer is used to analyze the components of the flue gas of the power plant after a series of desulfurization and dehydration processes. Its main components are nitrogen, carbon dioxide and oxygen. The inert gas content in the flue gas of the power plant is determined as the total gas content minus the oxygen content, which is recorded as C n， The CO2 content is recorded as C0.

[0126] For example, C n It is 94%.

[0127] After calculation by the above formula, we get Q n =600m 3 / h.

[0128] In another calculation method, the calculation can be performed based on the production area output. When determining the amount of flue gas injected into the second power plant in the goaf, the following formula is used for calculation:

[0129]

[0130] Among them, Q 2n is the flue gas injection amount of the second theoretical power plant;

[0131] Specifically, it is the theoretical power plant flue gas injection rate per hour;

[0132] A is the annual output;

[0133] T is the annual working days;

[0134] Specifically, the annual working days can be obtained based on historical experience, such as the number of annual working days in the past year, or the average number of annual working days in the past years, or the estimated number of annual working days in this year.

[0135] For example, the number of working days per year is 300.

[0136] ρ is the apparent density of coal;

[0137] For example, the apparent density of coal is 1390 kg / m 3 .

[0138] C1 is the original oxygen concentration in the oxidation zone of the goaf;

[0139] Exemplarily, C1 is 15%.

[0140] C2 is the inerting index of the oxidation zone in the goaf;

[0141] Exemplarily, C2 is 9%.

[0142] η1 is the gas transmission efficiency of the pipeline;

[0143] Specifically, part of the energy loss caused by pipeline resistance in the flue gas transmission pipeline can be injected into the goaf by increasing the injection pressure at the injection end, assuming there is no leakage. Therefore, in order to ensure safety, the pipeline gas transmission efficiency η1 is taken as 100%.

[0144] η2 is the gas injection efficiency in the goaf.

[0145] Specifically, select the place where the width of the oxidation zone in the goaf is the largest and a straight and regular section to measure the oxygen concentration and wind speed, establish a model according to the actual situation of the goaf underground, introduce a certain amount of power plant flue gas into the goaf, and after the power plant flue gas enters the goaf and stabilizes, measure the power plant flue gas content in the goaf, and take the ratio of the above-mentioned stabilized power plant flue gas content to the amount of power plant flue gas introduced as the goaf gas injection efficiency.

[0146] The gas injection efficiency of the goaf area specified in the "Code for Fire Protection Design of Coal Mine" is 0.3~0.7.

[0147] Exemplarily, η2 is 0.5.

[0148] After calculation, the obtained Q n Approximately 1063m 3 / h.

[0149] Step S1022: taking the maximum value of the first theoretical flue gas injection amount of the power plant and the second theoretical flue gas injection amount of the power plant as the theoretical flue gas injection amount of the power plant in the goaf.

[0150] For example, take Q n The value is 1063m 3 / h.

[0151] During the injection, 1,063 cubic meters of power plant flue gas are injected per hour.

[0152] Step S1023, determining the safety factor;

[0153] Specifically, the safety factor can be determined based on historical experience data and is generally set to 1.2.

[0154] Step S1024, determining the target power plant flue gas injection amount according to the safety factor and the theoretical power plant flue gas injection amount.

[0155] Specifically, the power plant flue gas injection amount is obtained by multiplying the above safety factor by the theoretical power plant flue gas injection amount.

[0156] For example, the safety factor is set to 1.2; the final gas injection volume Q of the goaf of the mine is n =1062.77×1.2=1275.6m 3 / h.

[0157] In order to calculate the adsorption amount of carbon dioxide injected into the power plant flue gas by the coal in the goaf, in one embodiment, calculating the adsorption amount of carbon dioxide injected into the power plant flue gas by the goaf specifically includes:

[0158] The following formula is used to determine the adsorption amount of carbon dioxide injected into the flue gas of the power plant by the goaf:

[0159]

[0160] Among them, Q n It is the target flue gas injection amount of the power plant; specifically, it is the target flue gas injection amount of the power plant per hour.

[0161] C0 is the carbon dioxide content in the flue gas of the power plant;

[0162] Q is the amount of carbon dioxide injected into the flue gas of the power plant adsorbed by the goaf;

[0163] Specifically, it is the amount of carbon dioxide injected into the flue gas of the power plant that is adsorbed by the goaf over a period of one year.

[0164] The test results show that the amount of carbon dioxide adsorbed by a ton of coal is 4.08 kg, and the volume under standard conditions is 2.08 m3.

[0165] For example, the gas injection volume is 1275.6m 3 / h, the carbon dioxide content in the flue gas is about 10%;

[0166] The amount of CO2 stored by adsorption each year is 1275.6×24×365×10%×4.08 / 2.08≈2192t.

[0167] In one embodiment, in the process of injecting power plant flue gas into the goaf according to the target power plant flue gas injection amount, obtaining the oxygen concentration value in the goaf;

[0168] In response to determining that the oxygen concentration value is greater than a predetermined oxygen concentration threshold, controlling the fan to start to accelerate air flow so that the oxygen concentration value decreases;

[0169] After the blower is started, in response to determining that the oxygen concentration value drops below the predetermined oxygen concentration threshold, the blower is controlled to stop.

[0170] The obtaining of the oxygen concentration value in the goaf includes:

[0171] Obtaining oxygen concentration values ​​detected by oxygen concentration sensors arranged at a plurality of different positions in the goaf;

[0172] In response to determining that the oxygen concentration value is greater than a predetermined oxygen concentration threshold, controlling the fan to start includes:

[0173] In response to determining that the oxygen concentration value detected by the target oxygen concentration sensor is greater than a predetermined oxygen concentration threshold, controlling the blower corresponding to the target oxygen concentration sensor to start, wherein the target oxygen concentration sensor is any one of the plurality of oxygen concentration sensors;

[0174] After the blower is started, in response to determining that the oxygen concentration value drops below the predetermined oxygen concentration threshold, controlling the blower to stop comprises:

[0175] After the fan corresponding to the target oxygen concentration sensor is started, in response to determining that the oxygen concentration value detected by the target oxygen concentration sensor drops below the predetermined oxygen concentration threshold, the fan corresponding to the target oxygen concentration sensor is controlled to stop.

[0176] Specifically, the goaf is divided into a plurality of sub-areas, and an oxygen concentration sensor and a fan are arranged in each sub-area;

[0177] The oxygen concentration sensor is used to detect the oxygen concentration. The fan is responsible for providing air flow to the area, and the specific location can be flexibly set. When the fan is started, the air flow in the area can be accelerated, thereby promoting the rapid distribution of power plant flue gas to the location, so that the oxygen concentration in the location drops rapidly. When the oxygen concentration value in the area drops to the threshold, the fan can be stopped.

[0178] In order to measure the oxygen concentration, in some embodiments, gas sensors are arranged in the flue gas pipeline of the power plant and the goaf of the mine to monitor the concentration change of oxygen in the goaf in real time. In addition to oxygen, other gas sensors can also be set to detect other gases, such as methane, etc. Guide the flue gas injection work in the goaf to achieve accurate and efficient injection and ensure safe recovery of the goaf.

[0179] Specifically, a laser optical fiber oxygen online monitoring system can be used to measure the oxygen content in the goaf.

[0180] In one embodiment, see the attached Figure 3 A schematic diagram of the structure of a laser optical fiber oxygen online monitoring system is shown;

[0181] The system includes: a scanning signal generating module 1, a laser control module 2, a beam splitter 3, a collimator 4, a detector group A8, a detector B9, a signal preamplifier 10, a data acquisition integrated box 11 and a server 12. In the figure, there are a closed wall 5 of the goaf, a goaf 6 and a standard sample 7.

[0182] The system is based on tunable semiconductor laser absorption spectroscopy technology, uses distributed feedback semiconductor lasers as the system light source, uses a semiconductor distributed feedback laser, selects a suitable oxygen absorption wavelength of 760nm without cross-interference, connects a long-range multiple reflection absorption cell through a single-mode optical fiber and an optical switch, and uses wavelength demodulation technology based on second harmonics to form a laser fiber oxygen online monitoring system. All components of the system can be integrated into the control box, and the measurement site is laid out through optical fiber networking.

[0183] In specific implementation, firstly, the scanning signal is outputted by the scanning signal generating module 1. The scanning signal is a sawtooth wave or a triangle wave, which is added to the laser control module 2 through the driving circuit so that the frequency range of the light emitted by the laser control module 2 can cover the target measurement absorption peak.

[0184] Secondly, the modulated laser beam is divided into two groups by a beam splitter 3. One group of laser beams passes through a collimator 4 and enters the goaf 6 through a drill hole on the goaf closed wall 5, and is received by a detector group A8. The other group of laser beams passes through a standard sample 7 and is received by a detector B9. The output laser is converted from the time domain to the frequency domain by using the detected interference fringes through a preamplifier 10, a data acquisition module 11 and a server 12.

[0185] The signal measured by the detector group A8 is the light intensity signal after being absorbed by the gas to be measured. When performing concentration inversion, the original light intensity must also be obtained to obtain the absorption signal that is independent of light intensity. The baseline fitting method is usually used to obtain the original light intensity of the absorption part, and the non-absorption part in the scanning interval is used to fit the light intensity baseline of the absorption interval. This method can eliminate the light intensity fluctuation effect generated in the light path during measurement and the overall light intensity attenuation effect introduced by dust scattering and optical windows.

[0186] This application can effectively improve the utilization rate of flue gas by recycling flue gas from power plants and injecting it into coal mine goafs. By determining the amount of gas injected, it is possible to ensure the maximum utilization efficiency of the gas, and there will be no excessive gas injection, resulting in insufficient oxygen concentration, which will affect production; nor will there be a spontaneous combustion of coal due to too little gas injection, resulting in an oxygen concentration greater than the threshold.

[0187] In the second aspect, the present application also discloses a goaf gas injection device, see the attached Figure 4 The structure diagram of a gas injection device for goaf shown in FIG. 1 is a schematic diagram of a gas injection device for goaf; the device comprises:

[0188] A determination module 41 is used to determine a target power plant flue gas injection amount to be injected into the goaf;

[0189] The flue gas injection control module 42 is used to inject the power plant flue gas into the goaf according to the target power plant flue gas injection amount.

[0190] Optionally, the determination module 41 is further used to: respectively determine a first theoretical power plant flue gas injection amount and a second theoretical power plant flue gas injection amount of the goaf;

[0191] The maximum value of the first theoretical power plant flue gas injection amount and the second theoretical power plant flue gas injection amount is used as the theoretical power plant flue gas injection amount of the goaf;

[0192] Determine the safety factor;

[0193] The target power plant flue gas injection amount is determined according to the safety factor and the theoretical power plant flue gas injection amount.

[0194] In one embodiment, the determination module 41 includes a first determination submodule 411, which is used to determine the first theoretical power plant flue gas injection amount of the goaf according to the following formula:

[0195] Q 1n =60×[(C1-C2)×Q0] / [(C n +C2)-1];

[0196] Among them, Q n is the flue gas injection amount of the first theoretical power plant;

[0197] Q0 is the air leakage in the oxidation zone of the goaf;

[0198] C1 is the original oxygen concentration in the oxidation zone of the goaf;

[0199] C2 is the inerting index of the oxidation zone in the goaf;

[0200] C n is the inert gas content in the flue gas of the injection power plant.

[0201] In one embodiment, the determination module 41 includes a second determination submodule 412, which is used to determine the second theoretical power plant flue gas injection amount of the goaf according to the following formula, including:

[0202]

[0203] Among them, Q 2n is the flue gas injection amount of the second theoretical power plant;

[0204] A is the annual output;

[0205] T is the annual working days;

[0206] ρ is the apparent density of coal;

[0207] C1 is the original oxygen concentration in the oxidation zone of the goaf;

[0208] C2 is the inerting index of the oxidation zone in the goaf;

[0209] η1 is the gas transmission efficiency of the pipeline;

[0210] η2 is the gas injection efficiency in the goaf.

[0211] In one embodiment, the determination module 41 includes a third determination submodule 413, which is used to use the maximum value of the first theoretical power plant flue gas injection amount and the second theoretical power plant flue gas injection amount as the theoretical power plant flue gas injection amount of the goaf;

[0212] In one embodiment, the determination module 41 includes a fourth determination submodule 414 for determining a safety factor;

[0213] In one embodiment, the determination module 41 includes a fifth determination submodule 415, which is used to determine the target power plant flue gas injection amount according to the safety factor and the theoretical power plant flue gas injection amount.

[0214] In one embodiment, the determination module 41 further includes a sixth determination submodule 416, which is used to determine the adsorption amount of carbon dioxide injected into the power plant flue gas by the goaf using the following formula after the fifth determination submodule 415 determines the target power plant flue gas injection amount:

[0215]

[0216] Among them, Q n is the flue gas injection amount of the target power plant;

[0217] C0 is the carbon dioxide content in the flue gas of the power plant;

[0218] Q is the amount of carbon dioxide injected into the flue gas of the power plant adsorbed by the goaf.

[0219] In one embodiment, it further includes an acquisition module 43, which is used to acquire the oxygen concentration value in the goaf during the process of injecting the power plant flue gas into the goaf according to the target power plant flue gas injection amount;

[0220] In one embodiment, a fan control module 44 is further included, which is used to control the fan to start in response to determining that the oxygen concentration value is greater than a predetermined oxygen concentration threshold value to accelerate the air flow so that the oxygen concentration value decreases; and after the fan is started, in response to determining that the oxygen concentration value drops below the predetermined oxygen concentration threshold value, control the fan to stop.

[0221] In one embodiment, the acquisition module 43 is further used to acquire oxygen concentration values ​​detected by oxygen concentration sensors arranged at multiple different positions in the goaf.

[0222] In one embodiment, the fan control module 44 is also used to control the start of the fan corresponding to the target oxygen concentration sensor in response to determining that the oxygen concentration value detected by the target oxygen concentration sensor is greater than a predetermined oxygen concentration threshold, wherein the target oxygen concentration sensor is any one of the multiple oxygen concentration sensors.

[0223] In one embodiment, the fan control module 44 is also used to control the fan corresponding to the target oxygen concentration sensor to stop in response to determining that the oxygen concentration value detected by the target oxygen concentration sensor drops below the predetermined oxygen concentration threshold after the fan corresponding to the target oxygen concentration sensor is started.

[0224] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0225] Figure 5 FIG. 5 is a block diagram of an electronic device 500 according to an exemplary embodiment. Figure 5 As shown, the electronic device 500 may include: a processor 501 and a memory 502. The electronic device 500 may also include one or more of a multimedia component 503, an input / output (I / O) interface 504, and a communication component 505.

[0226] The processor 501 is used to control the overall operation of the electronic device 500 to complete all or part of the steps in the goaf gas injection method described above. The memory 502 is used to store various types of data to support the operation of the electronic device 500, and these data may include, for example, instructions for any application or method used to operate on the electronic device 500, and application-related data, such as contact data, sent and received messages, pictures, audio, video, etc. The memory 502 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, disk or optical disk. The multimedia component 503 may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may be further stored in the memory 502 or sent through the communication component 505. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 504 provides an interface between the processor 501 and other interface modules, and the above-mentioned other interface modules may be keyboards, mice, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 505 is used for wired or wireless communication between the electronic device 500 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, is not limited here. Therefore, the corresponding communication component 505 may include: Wi-Fi module, Bluetooth module, NFC module, etc.

[0227] In an exemplary embodiment, the electronic device 500 can be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic components to execute the above-mentioned goaf gas injection method.

[0228] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, and when the program instructions are executed by a processor, the steps of the goaf gas injection method described above are implemented. For example, the computer-readable storage medium may be the memory 502 including the program instructions, and the program instructions may be executed by the processor 501 of the electronic device 500 to complete the goaf gas injection method described above.

[0229] Figure 6 6 is a block diagram of an electronic device 600 according to an exemplary embodiment. For example, the electronic device 600 may be provided as a server. Figure 6 The electronic device 600 includes a processor 622, which may be one or more, and a memory 632 for storing a computer program executable by the processor 622. The computer program stored in the memory 632 may include one or more modules, each corresponding to a set of instructions. In addition, the processor 622 may be configured to execute the computer program to perform the goaf gas injection method described above.

[0230] In addition, the electronic device 600 may further include a power supply component 626 and a communication component 650. The power supply component 626 may be configured to perform power management of the electronic device 600, and the communication component 650 may be configured to implement communication of the electronic device 600, for example, wired or wireless communication. In addition, the electronic device 600 may further include an input / output (I / O) interface 658. The electronic device 600 may operate based on an operating system stored in the memory 632, such as Windows Server 2000. TM , Mac OSX TM , Unix TM , Linux TM etc.

[0231] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, and when the program instructions are executed by a processor, the steps of the goaf gas injection method described above are implemented. For example, the non-transitory computer-readable storage medium can be the memory 632 including the program instructions, and the program instructions can be executed by the processor 622 of the electronic device 600 to complete the goaf gas injection method described above.

[0232] In another exemplary embodiment, a computer program product is also provided, which includes a computer program executable by a programmable device, and has a code portion for performing the above-mentioned goaf gas injection method when executed by the programmable device.

[0233] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0234] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0235] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A method for injecting gas into a goaf, characterized in that: include: Determine the target power plant flue gas injection amount to be injected into the goaf; Injecting power plant flue gas into the goaf according to the target power plant flue gas injection amount; In the process of injecting power plant flue gas into the goaf according to the target power plant flue gas injection amount, obtaining an oxygen concentration value in the goaf; In response to determining that the oxygen concentration value is greater than a predetermined oxygen concentration threshold, controlling the fan to start to accelerate air flow so that the oxygen concentration value decreases; After the blower is started, in response to determining that the oxygen concentration value drops below the predetermined oxygen concentration threshold, the blower is controlled to stop.

2. The method for injecting gas into a goaf according to claim 1, characterized in that: The step of determining the target power plant flue gas injection amount to be injected into the goaf includes: respectively determining a first theoretical power plant flue gas injection amount and a second theoretical power plant flue gas injection amount for the goaf; The maximum value of the first theoretical power plant flue gas injection amount and the second theoretical power plant flue gas injection amount is used as the theoretical power plant flue gas injection amount of the goaf; Determine the safety factor; The target power plant flue gas injection amount is determined according to the safety factor and the theoretical power plant flue gas injection amount.

3. The method for injecting gas into a goaf according to claim 2, characterized in that: The first theoretical power plant flue gas injection amount of the goaf is determined according to the following formula: ； in, is the first theoretical power plant flue gas injection amount, m 3 / h; is the air leakage in the oxidation zone of the goaf, m 3 / min; is the original oxygen concentration in the oxidation zone of the goaf, %; It is the inerting index of oxidation zone in goaf, %; is the inert gas content in the flue gas of the injection power plant, %.

4. The method for injecting gas into a goaf according to claim 2, characterized in that: The second theoretical power plant flue gas injection amount of the goaf is determined according to the following formula: ； in, is the second theoretical power plant flue gas injection amount; A is annual output, t; T is the annual working day, days; is the apparent density of coal, kg / m 3 ; is the original oxygen concentration in the oxidation zone of the goaf, %; It is the inerting index of oxidation zone in goaf, %; is the pipeline gas transmission efficiency, %; is the gas injection efficiency in the goaf, dimensionless.

5. The method for injecting gas into a goaf according to claim 1, characterized in that: After determining the target power plant flue gas injection amount, the method further includes: The following formula is used to determine the adsorption amount of carbon dioxide injected into the flue gas of the power plant by the goaf: ； in, is the target power plant flue gas injection amount, m 3 / h; is the carbon dioxide content in the flue gas of the power plant, %; Q is the amount of carbon dioxide injected into the flue gas of the power plant adsorbed by the goaf, t.

6. The method for injecting gas into a goaf according to claim 1, characterized in that: The obtaining of the oxygen concentration value in the goaf includes: Obtaining oxygen concentration values ​​detected by oxygen concentration sensors arranged at a plurality of different positions in the goaf; In response to determining that the oxygen concentration value is greater than a predetermined oxygen concentration threshold, controlling the fan to start includes: In response to determining that the oxygen concentration value detected by the target oxygen concentration sensor is greater than a predetermined oxygen concentration threshold, controlling the blower corresponding to the target oxygen concentration sensor to start, wherein the target oxygen concentration sensor is any one of the plurality of oxygen concentration sensors; After the blower is started, in response to determining that the oxygen concentration value drops below the predetermined oxygen concentration threshold, controlling the blower to stop comprises: After the fan corresponding to the target oxygen concentration sensor is started, in response to determining that the oxygen concentration value detected by the target oxygen concentration sensor drops below the predetermined oxygen concentration threshold, the fan corresponding to the target oxygen concentration sensor is controlled to stop.

7. A gas injection device for goaf, characterized in that: include: A determination module, used to determine the target power plant flue gas injection amount to be injected into the goaf; A flue gas injection control module, used for injecting power plant flue gas into the goaf according to the target power plant flue gas injection amount; an acquisition module, used for acquiring the oxygen concentration value in the goaf during the process of injecting the power plant flue gas into the goaf according to the target power plant flue gas injection amount; The fan control module is used to control the fan to start in response to determining that the oxygen concentration value is greater than a predetermined oxygen concentration threshold value to accelerate the air flow so that the oxygen concentration value decreases; and after the fan is started, in response to determining that the oxygen concentration value drops below the predetermined oxygen concentration threshold value, control the fan to stop.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 6 are implemented.

9. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 6.

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