Intelligent control method and system for coal mine gas drainage pump

Abstract

The application provides an intelligent control method and system for a coal mine gas drainage pump, and relates to the technical field of intelligent control of gas drainage pumps. The method comprises: collecting the gas concentration and vacuum degree in the coal seam gas drainage pipeline and the mining area gas drainage pipeline respectively; when the collected vacuum degree in the coal seam gas drainage pipeline is less than a first vacuum degree threshold, increasing the motor speed so that the vacuum degree is greater than or equal to the first vacuum degree threshold; when the collected vacuum degree in the coal seam gas drainage pipeline is greater than a second vacuum degree threshold, reducing the motor speed so that the vacuum degree is less than or equal to the second vacuum degree threshold; when the collected vacuum degree in the mining area gas drainage pipeline is less than a third vacuum degree threshold, increasing the motor speed so that the vacuum degree is greater than or equal to the third vacuum degree threshold; and when the collected gas concentration in the mining area gas drainage pipeline is greater than a concentration threshold, reducing the motor speed so that the gas concentration is less than or equal to the concentration threshold.

Description

Technical Field

[0001] This application relates to the field of intelligent control technology for gas drainage pumps, specifically to an intelligent control method and system for coal mine gas drainage pumps. Background Technology

[0002] Currently, coal mining typically involves using gas drainage pumps to extract two types of gas: gas that is free or adsorbed within the coal seam to be mined, and free gas in the air at the working face. Generally, during coal mining, the gas in the coal seam to be mined is first extracted. Once the gas concentration in the drainage pipeline has decreased to a certain level, coal seam mining can begin. During the mining process, gas in the air at the working face is simultaneously extracted.

[0003] However, the current methods for controlling and monitoring gas drainage pumps are relatively simple. They generally only focus on whether the gas concentration in each mining area is within a safe range. That is, they simply monitor the gas concentration in each mining area (within the drainage pipeline) separately, and then manually adjust the valve opening of each mining area's drainage pipeline in real time according to the gas concentration in each mining area. This not only results in low gas drainage efficiency, but also causes excessive energy consumption of the gas drainage pump. Summary of the Invention

[0004] To address the problems in related technologies, this application provides an intelligent control method and system for coal mine gas drainage pumps.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] According to a first aspect of this application, this application provides an intelligent control method for a coal mine gas drainage pump, the method comprising:

[0007] The gas concentration and vacuum level were collected in the coal seam gas drainage pipeline and the mining area gas drainage pipeline, respectively.

[0008] When the vacuum level in the coal seam gas drainage pipeline is less than the first vacuum threshold, the motor speed of the corresponding gas drainage pump is increased by adjusting the frequency converter so that the vacuum level in the coal seam gas drainage pipeline is greater than or equal to the first vacuum threshold; when the vacuum level in the coal seam gas drainage pipeline is greater than the second vacuum threshold, the motor speed of the corresponding gas drainage pump is decreased by adjusting the frequency converter so that the vacuum level in the coal seam gas drainage pipeline is less than or equal to the second vacuum threshold.

[0009] When the vacuum level in the gas drainage pipeline of the mining area is less than the third vacuum threshold, the motor speed of the corresponding gas drainage pump is increased by adjusting the frequency converter so that the vacuum level in the gas drainage pipeline of the mining area is greater than or equal to the third vacuum threshold. When the gas concentration in the gas drainage pipeline of the mining area is greater than the concentration threshold, the motor speed of the corresponding gas drainage pump is increased by adjusting the frequency converter so that the gas concentration in the gas drainage pipeline of the mining area is less than or equal to the concentration threshold.

[0010] Optionally, the intelligent control method for coal mine gas drainage pumps further includes:

[0011] When the vacuum level in the gas drainage pipeline of the mining area is less than the third vacuum threshold and the gas concentration in the gas drainage pipeline is greater than the concentration threshold, the corresponding gas drainage pump is adjusted by the frequency converter to increase the motor speed so that the gas concentration in the gas drainage pipeline of the mining area is less than or equal to the concentration threshold.

[0012] Optionally, the intelligent control method for coal mine gas drainage pumps further includes:

[0013] When the vacuum level in the gas drainage pipeline of the mining area is greater than the fourth vacuum threshold, the motor speed of the corresponding gas drainage pump is reduced by adjusting the frequency converter so that the vacuum level in the gas drainage pipeline of the mining area is less than or equal to the fourth vacuum threshold.

[0014] Optionally, the intelligent control method for coal mine gas drainage pumps further includes:

[0015] When the vacuum level in the gas drainage pipeline of the mining area is greater than the fourth vacuum threshold and the gas concentration in the gas drainage pipeline is greater than the concentration threshold, the corresponding gas drainage pump is adjusted by the frequency converter to increase the motor speed so that the gas concentration in the gas drainage pipeline of the mining area is less than or equal to the concentration threshold.

[0016] Optionally, the intelligent control method for coal mine gas drainage pumps further includes:

[0017] When the vacuum level in the gas drainage pipeline of the mining area is greater than the fourth vacuum threshold and the gas concentration in the gas drainage pipeline is less than the concentration threshold, the corresponding gas drainage pump is gradually reduced by adjusting the motor speed through the frequency converter until the gas concentration in the gas drainage pipeline of the mining area is equal to the concentration threshold.

[0018] Optionally, the intelligent control method for coal mine gas drainage pumps further includes:

[0019] When the frequency converter adjusts the speed of the gas drainage pump motor, the frequency converter gradually changes the frequency and amplitude of the motor's input voltage.

[0020] Optionally, the intelligent control method for coal mine gas drainage pumps further includes:

[0021] When the gas drainage pump corresponding to the gas drainage pipeline in the mining area has reached its maximum output power, and the collected gas concentration in the gas drainage pipeline in the mining area is greater than the concentration threshold,

[0022] Disconnect the gas drainage pump corresponding to the coal seam gas drainage pipeline from the coal seam gas drainage pipeline, and connect the mining area gas drainage pipeline to the gas drainage pump.

[0023] According to a second aspect of this application, an intelligent control system for a coal mine gas drainage pump is provided, applied to the intelligent control method for a coal mine gas drainage pump described in any of the technical solutions of the first aspect of this application. The intelligent control system for the coal mine gas drainage pump includes:

[0024] The first gas drainage pump group and the second gas drainage pump group are connected to the coal seam gas drainage pipeline for draining gas from the coal seam, and the second gas drainage pump group is connected to the mining area gas drainage pipeline for draining gas from the mining area air.

[0025] The sensor assembly includes a gas concentration sensor and a vacuum sensor. The gas concentration sensor is respectively installed in the coal seam gas drainage pipeline and the mining area gas drainage pipeline to collect the gas concentration and vacuum level in the coal seam gas drainage pipeline and the mining area gas drainage pipeline.

[0026] The control unit is electrically connected to the sensor assembly and the frequency converter, respectively. The control unit is configured to convert the data collected by the sensor assembly into a corresponding electrical signal and transmit the electrical signal to the frequency converter. The frequency converter is electrically connected to the first gas drainage pump group and the second gas drainage pump group, respectively, for adjusting the motor speed of the corresponding gas drainage pump.

[0027] Optionally, the gas concentration sensor is respectively installed at the inlet and outlet of the coal seam gas drainage pipeline and the mining area gas drainage pipeline, and the vacuum sensor is respectively installed at the inlet and outlet of the coal seam gas drainage pipeline and the mining area gas drainage pipeline.

[0028] Optionally, the intelligent control system for the coal mine gas drainage pump further includes a circulating water system, which includes a water tank, a constant water level tank, and a cooling tower. The inlet of the cooling tower is connected to the outlet of the gas drainage pump to cool the circulating water discharged by the gas drainage pump. The outlet of the cooling tower is connected to the water tank to contain the circulating water. The water tank is connected to the constant water level tank to supply circulating water to the constant water level tank. The constant water level tank is connected to the inlet of the gas drainage pump to supply water to the gas drainage pump at a constant water level.

[0029] Beneficial effects:

[0030] 1. Through the above technical solution, on the one hand, this application compares the vacuum degree collected in the coal seam gas drainage pipeline with a first vacuum degree threshold and a second vacuum degree threshold, and adjusts the motor speed of the gas drainage pump accordingly, so that the gas drainage pump corresponding to the coal seam gas drainage pipeline can operate at a more suitable power, thereby providing a suitable negative pressure for the coal seam gas drainage pipeline. Compared with the existing full-load operation scheme, this can effectively improve the negative pressure utilization efficiency, thus effectively avoiding energy waste and reducing the energy consumption of the gas drainage pump. On the other hand, this application compares the vacuum degree collected in the mining area gas drainage pipeline with a third vacuum degree threshold, and adjusts the speed of the gas drainage pump accordingly, so that the gas drainage pump corresponding to the mining area gas drainage pipeline can operate at a more suitable power, thereby providing a suitable negative pressure for the mining area gas drainage pipeline. Compared with the existing full-load operation scheme, this can effectively improve the negative pressure utilization efficiency, thus effectively avoiding energy waste and reducing the energy consumption of the gas drainage pump. On another front, this application compares the collected gas concentration in the gas drainage pipeline in the mining area with the concentration threshold, and adjusts the motor speed of the gas drainage pump accordingly. This not only ensures that the gas concentration in the mining area is within a safe range, but also helps to reduce the operating power of the gas drainage pump to a certain extent.

[0031] 2. When the vacuum degree of the gas drainage pipeline in the mining area is relatively large and the gas concentration is high, the priority is to control the gas concentration. This can be achieved by increasing the motor speed so that the gas drainage pump can provide a greater negative pressure to the gas drainage pipeline in the mining area. This will help increase the drainage capacity and ensure that the gas concentration can drop to a safe range relatively quickly. In this way, the safety of operations in the mining area can be effectively guaranteed.

[0032] 3. The frequency converter adjustment process is carried out step by step, and the vacuum degree and / or gas concentration are continuously verified synchronously to ensure that they meet the standards. This can effectively improve the adjustment efficiency and accuracy of the frequency converter, thereby effectively improving the gas extraction efficiency. In addition, it can also achieve energy saving, consumption reduction, high adjustment accuracy, and stable operation to a certain extent.

[0033] 4. When the gas concentration in the mining area is greater than the concentration threshold and the gas drainage pump has reached its maximum output power, it is impossible to improve the gas drainage efficiency by increasing the output power of the gas drainage pump. In this case, the gas drainage pump corresponding to the coal seam gas drainage pipeline can be disconnected from the coal seam gas drainage pipeline and connected to the mining area gas drainage pipeline to improve the gas drainage efficiency of the mining area, thereby effectively improving the safety of the mining area.

[0034] 5. In this application, the constant water level tank can maintain a constant liquid level. Therefore, the self-priming function of the gas extraction pump can be utilized to ensure that the water intake of the gas extraction pump meets its own needs, achieving precise control of the water intake and thus enabling the gas extraction pump to operate normally and efficiently. Simultaneously, the active control of the circulating water temperature through the installed cooling tower helps prevent scaling on related equipment or pipelines, further improving the operating efficiency of the gas extraction pump.

[0035] 6. Other beneficial effects or advantages of this application will be described in detail in conjunction with specific structures or steps in the specific embodiments. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In addition, it should be understood that the proportional relationship of each component in the drawings of this specification does not represent the proportional relationship in the actual material selection and design, but is only a schematic diagram of the structure or position, wherein:

[0037] Figure 1 This is a schematic diagram of the steps of an intelligent control method for a coal mine gas drainage pump provided in an exemplary embodiment of this application;

[0038] Figure 2 This is a schematic diagram of the structure of an intelligent control system for a coal mine gas drainage pump provided in an exemplary embodiment of this application;

[0039] Figure 3 This is a schematic diagram of the structure of an intelligent control system for a coal mine gas drainage pump provided in another exemplary embodiment of this application;

[0040] Figure 4 This is a schematic diagram of a coal seam gas drainage pipeline and a mining area gas drainage pipeline and their connection arrangement provided in an exemplary embodiment of this application. It also shows a first gas drainage pump group, a second gas drainage pump group, a gas drainage pump and a motor.

[0041] Explanation of the labels in the attached drawings:

[0042] 100 - Intelligent control system for coal mine gas drainage pumps; 1 - First gas drainage pump group; 2 - Second gas drainage pump group; 3 - Coal seam gas drainage pipeline; 4 - Mining area gas drainage pipeline; 5 - Sensor assembly; 51 - Gas concentration sensor; 52 - Vacuum sensor; 6 - Control unit; 7 - Frequency converter; 8 - Gas drainage pump; 81 - Motor; 9 - Circulating water system; 91 - Water tank; 92 - Constant water level tank; 93 - Cooling tower. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0045] It should be noted that the terms used in the description of this application, such as “first,” “second,” “third,” and “fourth,” are used only to distinguish the expressions and not to indicate or imply any distinction in importance or order.

[0046] To facilitate a clearer understanding of the technical solution of this application by those skilled in the art, the existing related technologies are described below:

[0047] Currently, in coal mining, the general process involves first drilling holes in the coal seam to be mined and laying coal seam gas drainage pipelines to extract the gas (i.e., free or adsorbed gas within the coal seam to be mined). During drainage, the gas concentration is monitored using gas concentration sensors installed at the outlet of the drainage pipelines. Once the gas concentration drops to a certain level and remains there for a certain period, coal seam mining can commence. Secondly, during coal seam mining, mining area gas drainage pipelines are simultaneously deployed in the mining area, and gas drainage is conducted continuously during mining to ensure that the gas concentration at the working face remains within a safe range.

[0048] However, after careful study by the applicant's technical personnel, at least two problems were found in this working method. First, because there is a certain degree of independence between the coal seam gas drainage pipeline and the mining area gas drainage pipeline, they are generally controlled separately. This results in a weak overall system for the coal mine gas drainage system, making it difficult to form a unified control system and leading to low gas extraction efficiency. Second, for the mining area gas drainage pipeline, current coal mining enterprises generally set up multiple gas drainage pumps connected to the mining area gas drainage pipeline. When the gas concentration in the mining area is within a safe range, only one or a few gas drainage pumps are started (operating at full load) to provide negative pressure to the mining area gas drainage pipeline to drain the gas. The other gas drainage pumps serve as backup pumps. After the gas concentration in the mining area exceeds the safe range, the backup pumps are connected to the mining area gas drainage pipeline (and the backup pumps also operate at full load) to increase the gas drainage capacity until the gas concentration is within a safe range. It is evident that during this process, all gas drainage pumps are generally operating at full load, often resulting in excessive negative pressure, which can easily lead to energy waste and excessive energy consumption of the gas drainage pumps.

[0049] In view of this, this application provides a novel intelligent control scheme for coal mine gas drainage pumps, which can comprehensively control the drainage process of coal seam gas and mining area gas. This not only helps to improve the overall integrity of the coal mine gas drainage system and improve gas drainage efficiency, but also effectively reduces energy waste and energy consumption during the operation of the gas drainage pump while ensuring that the gas concentration in the mining area is within a safe range.

[0050] The technical solution of this application will be described in detail below with reference to the accompanying drawings.

[0051] Example 1

[0052] Please see Figure 1 According to a first aspect of this application, an intelligent control method for a coal mine gas drainage pump is provided, the method comprising:

[0053] The gas concentration and vacuum level were collected in the coal seam gas drainage pipeline 3 and the mining area gas drainage pipeline 4, respectively.

[0054] When the vacuum level in the coal seam gas drainage pipeline 3 is less than the first vacuum level threshold, the speed of the motor 81 of the corresponding gas drainage pump 8 is increased by the frequency converter 7 so that the vacuum level in the coal seam gas drainage pipeline 3 is greater than or equal to the first vacuum level threshold; when the vacuum level in the coal seam gas drainage pipeline 3 is greater than the second vacuum level threshold, the speed of the motor 81 of the corresponding gas drainage pump 8 is decreased by the frequency converter 7 so that the vacuum level in the coal seam gas drainage pipeline 3 is less than or equal to the second vacuum level threshold.

[0055] When the vacuum level in the gas drainage pipeline 4 of the mining area is less than the third vacuum threshold, the speed of the corresponding gas drainage pump 8 is increased by the frequency converter 7 to make the vacuum level in the gas drainage pipeline 4 of the mining area greater than or equal to the third vacuum threshold; when the gas concentration in the gas drainage pipeline 4 of the mining area is greater than the concentration threshold, the speed of the corresponding gas drainage pump 8 is increased by the frequency converter 7 to make the gas concentration in the gas drainage pipeline 4 of the mining area less than or equal to the concentration threshold.

[0056] Through the above technical solutions, on the one hand, this application compares the vacuum degree collected in the coal seam gas drainage pipeline 3 with the first vacuum degree threshold and the second vacuum degree threshold, and adjusts the speed of the motor 81 of the gas drainage pump 8 accordingly, so that the gas drainage pump 8 corresponding to the coal seam gas drainage pipeline 3 can operate at a more suitable power, thereby providing a suitable negative pressure for the coal seam gas drainage pipeline 3. Compared with the existing full-load operation scheme, it can effectively improve the negative pressure utilization efficiency, and thus effectively avoid energy waste and reduce the energy consumption of the gas drainage pump 8. On the other hand, this application compares the vacuum degree collected in the mining area gas drainage pipeline 4 with the third vacuum degree threshold, and adjusts the speed of the gas drainage pump 8 accordingly, so that the gas drainage pump 8 corresponding to the mining area gas drainage pipeline 4 can operate at a more suitable power, thereby providing a suitable negative pressure for the mining area gas drainage pipeline 4. Compared with the existing full-load operation scheme, it can effectively improve the negative pressure utilization efficiency, and thus effectively avoid energy waste and reduce the energy consumption of the gas drainage pump 8. On another front, this application compares the gas concentration in the gas drainage pipeline 4 in the mining area with the concentration threshold, and adjusts the speed of the motor 81 of the gas drainage pump 8 accordingly. This not only ensures that the gas concentration in the mining area is within a safe range, but also helps to reduce the operating power of the gas drainage pump 8 to a certain extent.

[0057] Specifically, in the above technical solution, for the coal seam gas drainage pipeline 3, this application adjusts the speed of the motor 81 of the gas drainage pump 8 based on the collected vacuum data, so that the corresponding gas drainage pump 8 can provide a more suitable negative pressure for the coal seam gas drainage pipeline 3. This effectively reduces energy waste and consumption of the gas drainage pump 8 to a certain extent while ensuring the drainage effect of the coal seam gas drainage pipeline 3. For the mining area gas drainage pipeline 4, this application adjusts the speed of the motor 81 of the gas drainage pump 8 based on the collected vacuum data and gas concentration data, so that the corresponding gas drainage pump 8 can provide a more suitable negative pressure for the mining area gas drainage pipeline 4. This effectively reduces energy waste and consumption of the gas drainage pump 8 to a certain extent while ensuring that the gas concentration in the mining area is within a safe range.

[0058] It is understood that, in this application, firstly, the first vacuum threshold, the second vacuum threshold, and the third vacuum threshold can all be selected according to the actual situation. For example, in a certain actual coal mine, when the vacuum data is collected at the outlet of the coal seam gas drainage pipeline 3, the first vacuum threshold and the second vacuum threshold can be selected as 80 kPa and 40 kPa, respectively; when the vacuum data is collected at the inlet of the coal seam gas drainage pipeline 3, the first vacuum threshold and the second vacuum threshold can be selected as 15 kPa and 10 kPa, respectively; when the vacuum data is collected at the outlet of the mining area gas drainage pipeline 4, the third vacuum threshold can be selected as 30 kPa; when the vacuum data is collected at the inlet of the mining area gas drainage pipeline 4, the third vacuum threshold can be selected as 5 kPa. Therefore, this application does not specifically limit the values ​​and measurement locations of the first vacuum threshold, the second vacuum threshold, and the third vacuum threshold.

[0059] Second, regarding the concentration threshold, it can be selected according to the actual situation, provided that it complies with the relevant safety production regulations or requirements of the coal mining industry. For example, it can be selected as 0.8% or 0.5%. This application does not specify the value of the concentration threshold.

[0060] In addition, by collecting the gas concentration in the coal seam gas extraction pipeline 3, it can be determined whether the mixed exhaust air corresponding to this gas concentration can be utilized. If the gas concentration is low and has no utilization value, it can be treated and discharged. If the gas concentration is high and has utilization value, it can be transported to the gas power generation equipment for power generation, which not only helps to reduce environmental pollution, but also realizes energy utilization.

[0061] In one embodiment of this application, the intelligent control method for coal mine gas drainage pumps may further include: when the vacuum level in the gas drainage pipeline 4 of the mining area is less than the third vacuum level threshold and the gas concentration in the gas drainage pipeline 4 of the mining area is greater than the concentration threshold, the corresponding gas drainage pump 8 is adjusted by the frequency converter 7 to increase the speed of the motor 81 so that the gas concentration in the gas drainage pipeline 4 of the mining area is less than or equal to the concentration threshold.

[0062] In this way, when the vacuum degree of the gas drainage pipeline 4 in the mining area is low and the gas concentration is higher than the concentration threshold, that is, when the drainage negative pressure in the mining area is insufficient and the gas concentration is high, the speed of the motor 81 can be increased so that the gas drainage pump 8 can provide a greater negative pressure to the gas drainage pipeline 4 in the mining area. This is beneficial to increase the vacuum degree of the gas drainage pipeline 4 in the mining area, thereby increasing the gas drainage rate. This will help reduce the gas concentration in the mining area until it drops to a safe range, thus effectively ensuring the safety of operations in the mining area.

[0063] In one embodiment of this application, the intelligent control method for coal mine gas drainage pumps may further include: when the vacuum level in the gas drainage pipeline 4 of the mining area is greater than the fourth vacuum level threshold, the speed of the corresponding gas drainage pump 8 is reduced by the frequency converter 7 so that the vacuum level in the gas drainage pipeline 4 of the mining area is less than or equal to the fourth vacuum level threshold.

[0064] In this way, when the vacuum level of the gas drainage pipeline 4 in the mining area is relatively high, that is, the power of the gas drainage pump 8 is excessive, the output power of the gas drainage pump 8 can be reduced by decreasing the speed of the motor 81, which is beneficial to reduce the energy consumption of the gas drainage pump 8 and reduce energy waste.

[0065] In one embodiment of this application, the intelligent control method for coal mine gas drainage pumps may further include: when the vacuum degree collected in the mining area gas drainage pipeline 4 is greater than the fourth vacuum degree threshold and the gas concentration in the mining area gas drainage pipeline 4 is greater than the concentration threshold, the corresponding gas drainage pump 8 is adjusted by the frequency converter 7 to increase the speed of the motor 81 so that the gas concentration in the mining area gas drainage pipeline 4 is less than or equal to the concentration threshold.

[0066] In this way, when the vacuum degree of the gas drainage pipeline 4 in the mining area is relatively large and the gas concentration is relatively high, for safety reasons, with the priority of controlling the gas concentration, the speed of the motor 81 can be increased so that the gas drainage pump 8 can provide a greater negative pressure to the gas drainage pipeline 4 in the mining area. This is beneficial to increase the drainage capacity and ensure that the gas concentration can be reduced to a safe range relatively quickly. In this way, the safety of operations in the mining area can be effectively guaranteed.

[0067] In one embodiment of this application, the intelligent control method for coal mine gas drainage pumps may further include: when the vacuum degree collected in the mining area gas drainage pipeline 4 is greater than the fourth vacuum degree threshold and the gas concentration in the mining area gas drainage pipeline 4 is less than the concentration threshold, the corresponding gas drainage pump 8 is adjusted by the frequency converter 7 to gradually reduce the speed of the motor 81 until the gas concentration in the mining area gas drainage pipeline 4 is equal to the concentration threshold.

[0068] In this way, when the vacuum degree of the gas drainage pipeline 4 in the mining area is relatively large and the gas concentration is low, for safety reasons, with the gas concentration as the control benchmark, the speed of the motor 81 can be reduced to a limited extent so that the gas drainage pump 8 can meet the basic requirements of safe gas drainage. This can effectively reduce the output power of the gas drainage pump 8 to a certain extent, which can also help reduce the energy consumption and energy waste of the gas drainage pump 8 to a certain extent.

[0069] In one embodiment of this application, the intelligent control method for a coal mine gas drainage pump may further include: when the frequency converter 7 adjusts the speed of the motor 81 of the gas drainage pump 8, the frequency converter 7 gradually changes the frequency and amplitude of the input voltage of the motor 81.

[0070] Thus, inverter 7 converts AC power (fixed frequency) into controllable variable frequency AC power, and then outputs it to motor 81. Motor 81 receives the variable frequency AC power output from inverter 7 and generates corresponding torque and speed by rotating its rotor. Since the voltage output by inverter 7 changes gradually, the actual vacuum level and / or gas concentration can be compared with the adjustment target while inverter 7 is adjusting. The adjustment process can be stopped once the vacuum level and / or gas concentration reach the adjustment target. During this process, the adjustment of inverter 7 is carried out step by step, and with synchronous and continuous verification of whether the vacuum level and / or gas concentration meet the standard, the adjustment efficiency and accuracy of inverter 7 can be effectively improved, thereby effectively improving the gas extraction efficiency. In addition, it can also achieve energy saving, consumption reduction, high adjustment accuracy, and stable operation to a certain extent.

[0071] In one embodiment of this application, the intelligent control method for a coal mine gas drainage pump may further include: when the gas drainage pump 8 corresponding to the mining area gas drainage pipeline 4 has reached its maximum output power and the collected gas concentration in the mining area gas drainage pipeline 4 is greater than the concentration threshold, disconnecting the gas drainage pump 8 corresponding to the coal seam gas drainage pipeline from the coal seam gas drainage pipeline, and connecting the mining area gas drainage pipeline 4 to the gas drainage pump 8.

[0072] Thus, when the gas concentration in the mining area is greater than the concentration threshold and the gas drainage pump 8 has reached its maximum output power, it is impossible to improve the gas drainage efficiency by increasing the output power of the gas drainage pump 8. Instead, the gas drainage pump 8 corresponding to the coal seam gas drainage pipeline 3 can be disconnected from the coal seam gas drainage pipeline 3 and connected to the mining area gas drainage pipeline 4 to improve the gas drainage efficiency in the mining area, thereby effectively improving the safety of the mining area.

[0073] For details, please refer to Figure 4 ,exist Figure 4 In total, six gas drainage pumps (8) and two coal seam gas drainage pipelines (3) were installed. Figure 4 The high negative pressure pipeline in the middle), two gas drainage pipelines in the mining area 4 (i.e. Figure 4The system includes low-negative-pressure pipelines and three discharge pipelines, all interconnected by automatic valves. In this diagram, two coal seam gas drainage pipelines 3 are connected to the two discharge pipelines via two gas drainage pumps 8. One mining area gas drainage pipeline 4 is not connected, while the other mining area gas drainage pipeline 4 is connected to one discharge pipeline via a gas drainage pump 8. The other two gas drainage pumps 8 serve as backup pumps. This allows for flexible adjustment of the pipeline connections according to actual needs, ensuring effective gas drainage.

[0074] In addition, exhaust airflows with low methane concentrations that have no utilization value can be directly discharged into the air, while exhaust airflows with high methane concentrations that have utilization value can be connected to the methane power generation pipeline to facilitate the generation of electricity from methane.

[0075] In this embodiment, it should be noted that since the coal seam gas drainage pipeline 3 is only used to drain gas from the coal seam to be mined, it generally does not involve personnel safety. However, the mining area gas drainage pipeline 4 is mainly used for gas drainage in the mining area (where construction personnel are located). Therefore, this application designs a solution to temporarily improve the gas drainage effect in the mining area. That is, the gas drainage pump 8 corresponding to the coal seam gas drainage pipeline 3 is used for gas drainage in the mining area, which can effectively improve the gas drainage efficiency in the mining area. This can effectively ensure that the gas concentration in the mining area can quickly reach a safe range, which is beneficial to improving the safety of underground mining.

[0076] According to the second aspect of this application, such as Figures 2 to 4 As shown, this application also provides an intelligent control system 100 for a coal mine gas drainage pump, which is applied to the intelligent control method for a coal mine gas drainage pump in any of the technical solutions of the first aspect of this application. The intelligent control system 100 for the coal mine gas drainage pump may include a first gas drainage pump group 8 1, a second gas drainage pump group 8 2, a sensor assembly 5, a control unit 6, and a frequency converter 7.

[0077] The system comprises: a first gas drainage pump group 1 connected to a coal seam gas drainage pipeline 3 for draining gas from the coal seam; and a second gas drainage pump group 2 connected to a mining area gas drainage pipeline 4 for draining gas from the mining area air. The sensor assembly 5 includes a gas concentration sensor 51 and a vacuum sensor 52. The gas concentration sensor 51 is installed in both the coal seam gas drainage pipeline 3 and the mining area gas drainage pipeline 4 to collect the gas concentration and vacuum level within these pipelines. The control unit 6 is electrically connected to both the sensor assembly 5 and the frequency converter 7. The control unit 6 is configured to convert the data collected by the sensor assembly 5 into corresponding electrical signals and transmit these signals to the frequency converter 7. The frequency converter 7 is electrically connected to both the first gas drainage pump group 1 and the second gas drainage pump group 2 to adjust the speed of the motor 81 of the corresponding gas drainage pump 8.

[0078] Thus, on the one hand, the intelligent control system 100 for coal mine gas drainage pumps of this application can reliably implement the intelligent control method for coal mine gas drainage pumps in any of the technical solutions of the first aspect of this application, and can effectively improve the negative pressure utilization efficiency of the gas drainage pump 8, that is, can effectively avoid energy waste and reduce the energy consumption of the gas drainage pump 8. Furthermore, it can also specifically ensure that the gas concentration in the mining area is within a safe range.

[0079] It should be noted that, firstly, the first gas drainage pump group 8 group 1 and the second gas drainage pump group 8 group 2 of this application may each include multiple gas drainage pumps 8. For example, the first gas drainage pump group 8 group 1 and the second gas drainage pump group 8 group 2 may each include four gas drainage pumps 8, five gas drainage pumps 8, six gas drainage pumps 8, etc., and this application does not make a specific limitation in this regard. Secondly, the sensor assembly 5 of this application may also be configured as multiple to more accurately measure the corresponding vacuum degree and gas concentration, and this application does not make a specific limitation in this regard. Thirdly, the number of frequency converters 7 provided in this application can also be selected according to actual needs. For example, it may be configured as one frequency converter 7 or multiple frequency converters 7, and this application does not make a specific limitation in this regard.

[0080] The sensor component 5 of this application can be installed in various ways. For example, in one embodiment of this application, the gas concentration sensor 51 can be installed at the inlet and outlet of the coal seam gas drainage pipeline 3 and the mining area gas drainage pipeline 4, respectively, and the vacuum sensor 52 can be installed at the inlet and outlet of the coal seam gas drainage pipeline 3 and the mining area gas drainage pipeline 4, respectively.

[0081] Thus, on the one hand, simultaneously installing sensor components 5 at the inlet and outlet of the drainage pipelines (including coal seam gas drainage pipeline 3 and mining area gas drainage pipeline 4) can improve the accuracy of vacuum and gas concentration data collected by the sensor components 5, allowing the frequency converter 7 to more accurately adjust the corresponding gas drainage pump 8, thereby improving gas drainage efficiency. On the other hand, the gas concentration data from the vacuum data collected by the sensor components 5 can be used to more accurately determine whether there is a leak in the drainage pipeline, which helps to improve the safety and reliability of coal mine gas drainage.

[0082] Specifically, in this embodiment, the sensor assembly 5 can collect vacuum level data and gas concentration data at the inlet and outlet of the extraction pipeline, respectively. By comparing the data from these two locations, the accuracy of the collected data can be improved. Furthermore, comparing the data from the two locations can determine whether a leak has occurred in the extraction pipeline. For example, taking a mining area extraction pipeline as an example, the vacuum level and gas concentration data collected at its inlet are 5.6 kPa and 0.3%, respectively, while those collected at its outlet are 31.2 kPa and 0.15%, respectively. At this point, the vacuum level data conforms to conventional experience (generally, multiple mining area extraction pipelines are connected to one gas extraction pump 8, meaning it has multiple inlets and only one outlet; therefore, the vacuum level data at the outlet of the extraction pipeline is generally significantly greater than the vacuum level data at the inlet), while the gas concentration data shows a significant decrease. In this case, it can be determined that a leak has occurred in the mining area extraction pipeline, causing some gas containing methane to leak and mix with some air. At this point, the location of the drainage pipeline that may be leaking can be determined by combining the gas concentration sensor 51 and vacuum sensor 52 installed in other parts of the drainage pipeline in the mining area.

[0083] Currently, the circulating water system 9 for the gas extraction pump 8 typically consists of a high-level water tank (which uses pressure differential to pump circulating water into the gas extraction pump 8) and a low-level water tank (used to store circulating water and pump it to the high-level water tank). This method requires manual adjustment of the outlet valve of the high-level water tank to ensure the normal operation of the gas extraction pump 8. The adjustment process depends entirely on the operator's experience, and there are no monitoring, measurement, or verification methods. Furthermore, during the circulating water circulation process, cooling is generally achieved through heat exchange as the circulating water flows through the low-level water tank, high-level water tank, and related pipes. When the ambient temperature is high, the pipes are short, or the circulating water circulation rate is fast, the circulating water cannot be cooled quickly enough. This may lead to scaling on the gas extraction pump 8, high-level water tank, low-level water tank, or related pipes, resulting in low operating efficiency of the gas extraction pump 8.

[0084] In view of this, in one embodiment of this application, such as Figure 3As shown, the intelligent control system 100 for a coal mine gas drainage pump of this application may further include a circulating water system 9. The circulating water system 9 includes a water tank 91, a constant water level tank 92, and a cooling tower 93. The inlet of the cooling tower 93 is connected to the outlet of the gas drainage pump 8 to cool the circulating water discharged by the gas drainage pump 8. The outlet of the cooling tower 93 is connected to the water tank 91 to contain the circulating water. The water tank 91 is connected to the constant water level tank 92 to supply circulating water to the constant water level tank 92. The constant water level tank 92 is connected to the inlet of the gas drainage pump 8 to supply water to the gas drainage pump 8 at a constant water level.

[0085] In this embodiment, the constant water level tank 92 can maintain a constant liquid level. Therefore, the self-priming function of the gas extraction pump 8 can be utilized to ensure that the water intake of the gas extraction pump 8 meets its own water intake needs, achieving precise control of the water intake and thus enabling the gas extraction pump 8 to operate normally and efficiently. Simultaneously, the active control of the circulating water temperature through the cooling tower 93 helps prevent scaling on related equipment or pipelines, further improving the operating efficiency of the gas extraction pump 8.

[0086] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for intelligent control of a coal mine gas drainage pump, characterized in that, The application relates to an intelligent control method for a coal mine gas drainage pump. The vacuum degree and the gas concentration in the coal seam gas drainage pipeline (3) and the mining area gas drainage pipeline (4) are collected respectively; When the collected vacuum degree in the coal seam gas drainage pipeline (3) is less than the first vacuum degree threshold, the corresponding gas drainage pump (8) is adjusted by the frequency converter (7) to increase the rotating speed of the motor (81), so that the vacuum degree in the coal seam gas drainage pipeline (3) is greater than or equal to the first vacuum degree threshold; when the collected vacuum degree in the coal seam gas drainage pipeline (3) is greater than the second vacuum degree threshold, the corresponding gas drainage pump (8) is adjusted by the frequency converter (7) to decrease the rotating speed of the motor (81), so that the vacuum degree in the coal seam gas drainage pipeline (3) is less than or equal to the second vacuum degree threshold; When the collected vacuum degree in the mining area gas drainage pipeline (4) is less than the third vacuum degree threshold, the corresponding gas drainage pump (8) is adjusted by the frequency converter (7) to increase the rotating speed of the motor (81), so that the vacuum degree in the mining area gas drainage pipeline (4) is greater than or equal to the third vacuum degree threshold; when the collected gas concentration in the mining area gas drainage pipeline (4) is greater than the concentration threshold, the corresponding gas drainage pump (8) is adjusted by the frequency converter (7) to increase the rotating speed of the motor (81), so that the gas concentration in the mining area gas drainage pipeline (4) is less than or equal to the concentration threshold.

2. The intelligent control method for a coal mine gas drainage pump according to claim 1, characterized in that, The intelligent control method for the coal mine gas drainage pump further comprises the following steps: When the collected vacuum degree in the mining area gas drainage pipeline (4) is less than the third vacuum degree threshold and the gas concentration in the mining area gas drainage pipeline (4) is greater than the concentration threshold, the corresponding gas drainage pump (8) is adjusted by the frequency converter (7) to increase the rotating speed of the motor (81), so that the gas concentration in the mining area gas drainage pipeline (4) is less than or equal to the concentration threshold.

3. The intelligent control method for a coal mine gas drainage pump according to claim 1, characterized in that, The intelligent control method for the coal mine gas drainage pump further comprises the following steps: When the collected vacuum degree in the mining area gas drainage pipeline (4) is greater than the fourth vacuum degree threshold, the corresponding gas drainage pump (8) is adjusted by the frequency converter (7) to decrease the rotating speed of the motor (81), so that the vacuum degree in the mining area gas drainage pipeline (4) is less than or equal to the fourth vacuum degree threshold.

4. The intelligent control method for a coal mine gas drainage pump according to claim 3, characterized in that, The intelligent control method for the coal mine gas drainage pump further comprises the following steps: When the collected vacuum degree in the mining area gas drainage pipeline (4) is greater than the fourth vacuum degree threshold and the gas concentration in the mining area gas drainage pipeline (4) is greater than the concentration threshold, the corresponding gas drainage pump (8) is adjusted by the frequency converter (7) to increase the rotating speed of the motor (81), so that the gas concentration in the mining area gas drainage pipeline (4) is less than or equal to the concentration threshold.

5. The intelligent control method for a coal mine gas drainage pump according to claim 3, characterized in that, The intelligent control method for the coal mine gas drainage pump further comprises the following steps: When the collected vacuum degree in the mining area gas drainage pipeline (4) is greater than the fourth vacuum degree threshold and the gas concentration in the mining area gas drainage pipeline (4) is less than the concentration threshold, the rotating speed of the motor (81) of the corresponding gas drainage pump (8) is gradually decreased by the frequency converter (7) until the gas concentration in the mining area gas drainage pipeline (4) is equal to the concentration threshold.

6. The intelligent control method for a coal mine gas drainage pump according to claim 1, characterized in that, The intelligent control method for the coal mine gas drainage pump further comprises the following steps: When the frequency converter (7) adjusts the rotating speed of the motor (81) of the gas drainage pump (8), the frequency converter (7) gradually changes the frequency and amplitude of the input voltage of the motor (81).

7. The intelligent control method for a coal mine gas drainage pump according to claim 1, characterized in that, The intelligent control method for the coal mine gas drainage pump further comprises: When the corresponding gas drainage pump (8) of the mining area gas drainage pipeline (4) has reached the maximum output power, and the collected gas concentration in the mining area gas drainage pipeline (4) is greater than the concentration threshold value, Disconnect the corresponding gas drainage pump (8) of the coal seam gas drainage pipeline from the coal seam gas drainage pipeline, and connect the mining area gas drainage pipeline (4) to the gas drainage pump (8).

8. An intelligent control system for a coal mine gas extraction pump, characterized in that, The intelligent control system (100) for the coal mine gas drainage pump applied to the intelligent control method for the coal mine gas drainage pump according to any one of claims 1-7 comprises: A first gas drainage pump group (1) and a second gas drainage pump group (2), the first gas drainage pump group (1) is connected with the coal seam gas drainage pipeline (3) for draining gas in the coal seam, and the second gas drainage pump group (2) is connected with the mining area gas drainage pipeline (4) for draining gas in the mining area air; A sensor assembly (5) comprising a gas concentration sensor (51) and a vacuum degree sensor (52), the gas concentration sensor (51) is arranged in the coal seam gas drainage pipeline (3) and the mining area gas drainage pipeline (4) respectively for collecting the gas concentration and vacuum degree in the coal seam gas drainage pipeline (3) and the mining area gas drainage pipeline (4); A control unit (6) and a frequency converter (7), the control unit (6) is electrically connected with the sensor assembly (5) and the frequency converter (7) respectively, the control unit (6) is configured to convert the data collected by the sensor assembly (5) into corresponding electrical signals and transmit the electrical signals to the frequency converter (7), and the frequency converter (7) is electrically connected with the first gas drainage pump group (1) and the second gas drainage pump group (2) respectively for adjusting the rotating speed of the motor (81) of the corresponding gas drainage pump (8).

9. The intelligent control system for a coal mine gas drainage pump according to claim 8, characterized in that, The gas concentration sensor (51) is arranged at the pipeline inlet and the pipeline outlet of the coal seam gas drainage pipeline (3) and the mining area gas drainage pipeline (4) respectively, and the vacuum degree sensor (52) is arranged at the pipeline inlet and the pipeline outlet of the coal seam gas drainage pipeline (3) and the mining area gas drainage pipeline (4) respectively.

10. The intelligent control system for coal mine gas drainage pump as claimed in claim 8, wherein, The intelligent control system (100) for the coal mine gas drainage pump further comprises a circulating water system (9), the circulating water system (9) comprises a water pool (91), a constant water level water tank (92) and a cooling tower (93), a water inlet of the cooling tower (93) is communicated with a water outlet of the gas drainage pump (8) for cooling circulating water discharged by the gas drainage pump (8), a water outlet of the cooling tower (93) is communicated with the water pool (91), the water pool (91) is used for containing circulating water, the water pool (91) is communicated with the constant water level water tank (92) for conveying circulating water to the constant water level water tank (92), and the constant water level water tank (92) is used for being communicated with a water inlet of the gas drainage pump (8) for supplying water to the gas drainage pump (8) in a constant water level mode.

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