Nitrogen making device and double-medium compressed air source device and method for coal mine underground drilling

Abstract

The invention discloses a nitrogen making device and a double-medium compressed gas source device and method for coal mine underground drilling, the nitrogen making device comprises an air compressor, a gas-liquid separator, a filter and a separation membrane group which are arranged in a communicating manner, and further comprises a heat exchanger unit mounted between the filter and the separation membrane group, and the air compressor is communicated with the heat exchanger unit through a lubricating oil way; a two-position three-way valve is further mounted between the heat exchanger unit and the separation membrane group; a compressed air output end is mounted on the two-position three-way valve; the two-position three-way valve is used for adjusting the type of output gas. A two-position three-way valve is adopted to realize a dual-mode output mode so as to adapt to gas supply requirements in different environments, and the applicability of equipment is improved. Under the background that the flow of coal mine cooling water is very limited and cyclic utilization is not realized at present, a path of hot oil is led out from an air compressor to heat clean compressed air to the optimal working temperature of a separation membrane group through an intelligent temperature control valve and a heat exchanger, so that the performance and the efficiency are improved, and the problem of overheating shutdown is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine underground gas source devices, and in particular to a nitrogen production device, a dual-medium compressed gas source device and a method for underground coal mine drilling. Background Art

[0002] At present, drilling extraction is one of the main means of gas control in high-order broken soft coal seams. When using traditional hydraulic measurement-while-drilling drilling technology equipment for drilling construction, clean water is used as the power and slag removal medium of the bottom hole motor. Due to the flushing of the hole wall by clean water, the coal body structure is broken and the mechanical strength stability is poor. It is easy to cause complex phenomena such as hole collapse and drill jam, which significantly reduces the hole depth and hole formation rate. Compared with water, compressed gas has less flushing effect on the hole wall, which can better maintain the stability of the hole wall and reduce the incidence of hole collapse and drill jam. Therefore, in recent years, pneumatic directional drilling technology has been widely used in gas extraction and control of broken soft coal seams. This technology relies on a compressed gas source device to provide a stable and controllable gas source in the borehole. The automated operation of the gas source device and its coordinated control with the construction drilling rig are one of the key technologies to improve the construction efficiency and stability of pneumatic directional drilling technology.

[0003] The first defect of the prior art is that the proposed nitrogen-generating equipment cannot switch between the two modes of outputting nitrogen or air according to the requirements of the air drilling process. In actual working conditions, in the open state when drilling, the high-concentration nitrogen output is a dangerous factor for drilling personnel. The "Coal Mine Safety Regulations" stipulate that the oxygen concentration at the underground work site shall not be less than 20%; the second defect is that the proposed nitrogen-generating equipment cooling system has relatively high requirements for water flow, and it is easy to overheat and shut down due to insufficient cooling water during on-site use; the third defect is that the proposed nitrogen-generating device and its nitrogen-generating process are only based on the nitrogen-generating device itself, and remote joint control with the drilling construction drill rig is not realized, and two-way communication cannot be realized. The operating parameters of the nitrogen-generating device cannot be displayed at the drilling site, and the drilling site construction personnel cannot control and adjust the output nitrogen concentration and pressure in real time, and the work efficiency is low.

[0004] Membrane separation nitrogen production technology uses the different rates of oxygen, nitrogen and other components in the air penetrating specific membrane materials to produce nitrogen. Compared with other nitrogen production methods such as molecular sieve adsorption and cryogenic air separation, the membrane separation nitrogen production system required by membrane separation nitrogen production technology occupies a small area, is light in weight, and has high separation efficiency. It is suitable for the low and narrow working environment underground in coal mines. Therefore, the compressed air source device for pneumatic drilling construction in coal mines can adopt membrane separation nitrogen production technology. However, how the air source device switches the working mode according to the drilling process, how to obtain the air source with the required concentration and pressure through automatic control, and how to achieve remote collaborative control with the drilling rig are key factors affecting the construction efficiency and safety of pneumatic drilling technology. Summary of the invention

[0005] Aiming at the deficiencies existing in the prior art, the purpose of the present invention is to provide a dual-medium compressed air source device and method for underground coal mine drilling, so as to solve the problems of the existing nitrogen generation device being unable to adapt to different working conditions and having low working efficiency.

[0006] To solve the above technical problems, the present invention is implemented by adopting the following technical solutions: A dual-medium compressed air source device for underground coal mine drilling includes an air compressor, an air-liquid separator, a filter, and a separation membrane group that are connected in series.

[0007] A two-position three-way valve is also installed between the heat exchanger unit and the separation membrane group, and a compressed air output end is installed on the two-position three-way valve.

[0008] An oxygen-rich gas output end is installed on the separation membrane group.

[0009] The two-position three-way valve is used to adjust the type of output gas.

[0010] The nitrogen generation device further includes a heat exchanger unit installed between the filter and the separation membrane group, and the air compressor is connected to the heat exchanger unit through a lubricating oil path.

[0011] It is used to heat the gas in the heat exchanger unit through the lubricating oil of the air compressor.

[0012] The present invention also has the following technical features:

[0013] The filter includes a precision filter, an ultra-precision filter, an activated carbon filter, and a particle filter that are connected in series.

[0014] The precision filter is connected to the air-liquid separator, and the particle filter is connected to the heat exchanger unit.

[0015] The heat exchanger unit includes a spiral plate heat exchanger unit and an intelligent temperature control valve installed on the spiral plate heat exchanger unit. Through the adjustment of the intelligent temperature control valve, the intake air is heated within a set range (45 - 55 °C).

[0016] The present invention also provides a dual-medium compressed air source device for underground coal mine drilling, including a control system, and the control system is connected to the above-mentioned nitrogen generation device.

[0017] The control system includes a temperature and pressure monitoring unit, and the temperature and pressure monitoring unit is connected to a control unit.

[0018] The control system further includes a flow meter, an oxygen concentration meter, and a purity control valve that are connected in series. The flow meter is connected to the output end of the separation membrane group, and the flow meter, the oxygen concentration meter, and the purity control valve are connected to the control unit.

[0019] The described control unit is also connected to a two-position three-way valve.

[0020] The described flowmeter, oxygen concentration meter, and purity control valve are connected to the control unit.

[0021] The described control system further includes a switching branch for automatic discharge of qualified gas, which is installed after the output end of the separation membrane module and before the main gas supply pipeline.

[0022] When the set purity is reached by adjustment of the purity control valve, that is, when the oxygen content is lower than the set discharge point, the gas is input to the usage point through the qualified gas production branch; while when the oxygen content is higher than the set discharge point, that is, when the product gas does not reach the set purity, the discharge branch automatically opens to discharge the over-standard gas.

[0023] The described control system further includes a gas flow characteristic monitoring and analysis unit.

[0024] The described gas flow characteristic monitoring and analysis unit includes a pressure sensor arranged at the outlet of the nitrogen production device, a data collector connected to the pressure sensor, a data analyzer connected to the data collector, and a controller.

[0025] The controller controls the operating parameters of the nitrogen production device according to the analysis results to achieve a stable and controllable gas source. If an abnormality occurs, the controller controls the air compressor to stop working.

[0026] The described temperature and pressure monitoring unit includes:

[0027] A first temperature sensor and a first pressure transmitter installed at the air inlet of the air compressor.

[0028] A second temperature sensor and a second pressure transmitter installed at the air inlet end of the separation membrane module.

[0029] A third temperature sensor and a third pressure transmitter installed at the air outlet end of the separation membrane module.

[0030] It further includes a communication system installed between the dual-medium compressed gas source device for underground coal mine drilling and the drill rig at the drill site.

[0031] The described communication system includes: a proximal electric control cabinet and a first switch, a first PLC, an optical fiber transmitter, and a first touch screen installed in the proximal electric control cabinet.

[0032] The described communication system further includes a distal electric control cabinet and a second switch, a second PLC, an optical fiber receiver, and a second touch screen installed in the distal electric control cabinet.

[0033] Connect the first PLC in the proximal electric control cabinet to the first PLC and the second PLC in the distal electric control cabinet through the first switch, the second switch, the optical fiber transmitter and the optical fiber receiver in the form of a bus, a network cable or an optical fiber, which can realize real-time and fast data communication between the gas source device and the drilling rig, including the start-stop and setting instructions of the gas source device by the construction personnel on the drilling rig side, and the real-time monitoring of the sensing data of the gas source device.

[0034] The construction personnel issue control instructions through the first touch screen or the second touch screen, including start, working mode switching, setting of the finished nitrogen concentration, emergency stop, etc. After the proximal electric control cabinet sends the control instructions through the optical fiber transmitter, the optical fiber receiver in the distal electric control cabinet receives the control instructions, processes and executes the corresponding instruction actions.

[0035] The described gas flow characteristic monitoring and analysis unit is installed in the proximal electric control cabinet.

[0036] The present invention also provides a method for a dual-medium compressed gas source device for underground coal mine drilling, which is completed by using the above-mentioned dual-medium compressed gas source device for underground coal mine drilling.

[0037] First step, before the drilling construction, the construction personnel at the drilling site set the exhaust pressure of the air compressor, select the output pressure, and set the working mode of the nitrogen production device (air supply / nitrogen supply) and the product gas concentration index when supplying nitrogen according to the drilling process requirements through the remote control.

[0038] Second step, press the start button, and the start instruction and set parameters are transmitted to the proximal electric control cabinet of the nitrogen production device through the bus or the ring network. Start the system through the main electric control box. The first temperature sensor and the first pressure transmitter monitor the intake temperature and pressure of the air compressor. If the intake temperature and pressure exceed the standard, the main electric control box automatically stops emergently and gives an audible and visual alarm. If the intake temperature and pressure are normal, the air compressor starts to work and filters, deoils and purifies the gas source in turn.

[0039] Third step, the part after the air compressor in the nitrogen production device starts.

[0040] Fourth step, the system monitors the gas temperature and pressure in the pipeline in real time to ensure that they always meet the set requirements. Before the gas pretreated by the air compressor enters the separation membrane module, measure its intake pressure, flow rate and operating temperature. If it exceeds the set range, the system gives an alarm. If all indicators are normal, the system starts to run.

[0041] Fifth step, the nitrogen production device executes actions according to the working mode set by the operator. If it is the air supply mode, close the two-position three-way valve to the nitrogen production device end and supply gas. If it is the nitrogen supply mode, open the two-position three-way valve to the nitrogen production device end, and the gas source is introduced into the separation membrane module for nitrogen-oxygen separation.

[0042] After the separation is completed, the nitrogen concentration in the finished gas is detected. If the concentration reaches the artificially set threshold, nitrogen supply is carried out; otherwise, bypass evacuation is carried out to ensure that the product gas meets the concentration standard.

[0043] During the operation of the system, information such as gas pressure and temperature is sent to the second touch screen of the remote electric control cabinet via a bus or a ring network for visualization, providing operation information for the drilling construction personnel.

[0044] Compared with the prior art, the present invention has the following technical effects:

[0045] (Ⅰ) A nitrogen production device provided by the present invention adopts a two-position three-way valve to achieve a dual-mode output mode to adapt to the gas supply requirements in different environments, improving the applicability of the equipment.

[0046] Under the current background of extremely limited flow rate of coal mine cooling water and no realization of recycling, a hot oil is led out from the air compressor and passes through an intelligent temperature control valve and a heat exchanger to heat the clean compressed air to the optimal working temperature of the separation membrane module, improving the performance and efficiency and solving the problem of overheating shutdown.

[0047] (Ⅱ) For a dual-medium compressed gas source device for underground coal mine drilling provided by the present invention, the gas flow characteristic monitoring and analysis system monitors and analyzes the operation data of the nitrogen production device in real time, can more accurately judge the gas flow state, and timely takes corresponding measures to adjust the operation parameters of the air compressor and the nitrogen production device to ensure the stable operation of the equipment.

[0048] The communication system can realize two-way communication between the gas source device and the drilling rig. The operation parameters of the air compressor and the nitrogen production equipment can be displayed at the drilling site. According to the operation parameters of the drilling rig, the nitrogen production equipment is controlled to adjust the output nitrogen concentration and pressure, making the gas supply process more intelligent, improving the drilling efficiency of the drilling rig, and reducing the manual operation cost.

[0049] (Ⅲ) A method for a dual-medium compressed gas source device for underground coal mine drilling provided by the present invention is simple to operate and convenient to maintain, reduces the use cost, and has high economic and social benefits.

[0050] (Ⅳ) A method for a dual-medium compressed gas source device for underground coal mine drilling provided by the present invention effectively reduces the occupational disease risk of operating personnel and protects the health of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is the overall structural schematic diagram of the present invention.

[0052] Figure 2 is the schematic diagram of the communication system of the present invention.

[0053] The meanings of the various reference numerals in the drawings:

[0054] 1 - Air compressor, 2 - Gas - liquid separator, 3 - Filter, 4 - Separation membrane module, 5 - Heat exchanger unit, 6 - Two - position three - way valve, 7 - Control system, 8 - Communication system.

[0055] 3 - 1 Precision filter, 3 - 2 Ultra - precision filter, 3 - 3 Activated carbon filter, 3 - 4 Particle filter.

[0056] 7 - 1 - Temperature and pressure monitoring unit, 7 - 2 Flowmeter, 7 - 3 Oxygen concentration meter, 7 - 4 Purity control valve, 7 - 5 Gas flow characteristic monitoring and analysis unit.

[0057] 8 - 1 Proximal electric control cabinet, 8 - 2 First switch, 8 - 3 First PLC, 8 - 4 Optical fiber transmitter, 8 - 5 First touch screen, 8 - 6 Distal electric control cabinet, 8 - 7 Second switch, 8 - 8 Second PLC, 8 - 9 Optical fiber receiver, 8 - 10 Second touch screen.

[0058] 7 - 1 - 1 First temperature sensor, 7 - 1 - 2 First pressure transmitter, 7 - 1 - 3 Second temperature sensor, 7 - 1 - 4 Second pressure transmitter, 7 - 1 - 5 Third temperature sensor, 7 - 1 - 6 Third pressure transmitter.

[0059] 7 - 5 - 1 Pressure sensor, 7 - 5 - 2 Data collector, 7 - 5 - 3 Data analyzer, 7 - 5 - 4 Controller.

[0060] The following further explains the specific content of the present invention in detail in combination with embodiments. Specific embodiments

[0061] All components in the present invention, unless otherwise specified, are all components known in the prior art.

[0062] The following gives specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solutions of this application fall within the protection scope of the present invention.

[0063] Embodiment 1:

[0064] This embodiment provides a dual - medium compressed gas source device for underground coal mine drilling, as Figure 1 - Figure 2 shown, including an air compressor 1, a gas - liquid separator 2, a filter 3, and a separation membrane module 4 that are connected in series.

[0065] The nitrogen - making device further includes a heat exchanger unit 5 installed between the filter 3 and the separation membrane module 4, and the air compressor 1 is connected to the heat exchanger unit 5 through a lubricating oil circuit.

[0066] It is used to heat the gas in the heat exchanger unit 5 through the lubricating oil of the air compressor 1.

[0067] A two-position three-way valve 6 is also installed between the heat exchanger unit 5 and the separation membrane module 4, and a compressed air output end is installed on the two-position three-way valve 6.

[0068] An oxygen-rich gas output end is installed on the separation membrane module 4.

[0069] The two-position three-way valve 6 is used to adjust the type of the output gas.

[0070] Air is compressed by the air compressor 1 and then enters the gas-liquid separator 2 and the precision filter 3-1 to remove the liquid and oil mist in the compressed air. Then, it passes through the ultra-precision filter 3-2 and the activated carbon filter 3-3 for filtration to remove micro oil mist and VOC, and the oil content in the compressed air can be reduced to less than 0.01 mg / m3. Then, it passes through the particle filter 3-4 to filter out all solid particles with a diameter greater than 0.01 m. Then, it enters the heat exchanger unit 5 for heat exchange to enable the separation membrane module 4 to work under the optimal temperature conditions. The compressed air that has undergone the above purification treatment and is at a constant temperature and pressure enters the separation membrane module 4 for oxygen / nitrogen separation. The compressed air undergoes membrane separation to obtain high-pressure nitrogen with a pressure slightly lower than the inlet pressure, and the two-position three-way valve 6 can switch to output nitrogen or compressed air.

[0071] A path of lubricating oil is led out from the air compressor 1 and exchanges heat with the compressed air through the heat exchanger unit 5. Through the adjustment of the intelligent temperature control valve, the inlet air is heated within a set range (45 - 55 °C). Generally, the temperature is controlled at about 50 °C to enable the separation membrane module 4 to work under the most suitable conditions. At the same time, this path of lubricating oil is also cooled, enhancing the cooling capacity of the air compressor 1 for the lubricating oil, and it is not easy to cause overheating shutdown when the lubricating oil returns to the air compressor 1.

[0072] As a preference of this embodiment:

[0073] The filter 3 includes a precision filter 3-1, an ultra-precision filter 3-2, an activated carbon filter 3-3, and a particle filter 3-4 that are connected in sequence.

[0074] The precision filter 3-1 is connected to the gas-liquid separator 2, and the particle filter 3-4 is connected to the heat exchanger unit 5.

[0075] The filtration accuracy of the precision filter is usually 1 - 50 micrometers (μm), which can intercept particles, suspended substances, some bacteria, etc. The application scenarios include industrial pretreatment, drinking water purification, food and beverage production, etc. Common types include bag filters, melt-blown filter elements (PP cotton), stainless steel filter meshes, etc.

[0076] The filtration accuracy of the ultra-precision filter is as high as 0.1 to 0.01 microns (100 to 10 nanometers), which can remove viruses, colloids, macromolecular organic substances, etc. The application scenarios include semiconductor ultrapure water, biopharmaceuticals, high-end laboratories, nanomaterial preparation, etc. The common types are hollow fiber membranes, ceramic membranes, reverse osmosis (RO) membranes, etc.

[0077] The activated carbon filter is a purification device with activated carbon as the core filter material. It adsorbs pollutants in water or air through its developed pore structure and large specific surface area, including organic substances, odors, heavy metals, and harmful gases.

[0078] The particle filter is a filtering device with solid particle materials (such as activated carbon, quartz sand, etc.) as the core filter material. It removes impurities in liquids or gases through physical interception, adsorption, etc. Its core filter material (such as activated carbon particles) has a porous structure and a high specific surface area, which can effectively intercept suspended solids, organic substances, odors, and some dissolved pollutants.

[0079] As a preference of this embodiment:

[0080] The heat exchanger unit 5 includes a spiral plate heat exchanger unit and an intelligent temperature control valve installed on the spiral plate heat exchanger unit. Through the adjustment of the intelligent temperature control valve, the intake air is heated within a set range (45 - 55 °C).

[0081] Embodiment 2:

[0082] A dual-medium compressed gas source device for underground coal mine drilling includes a control system 7, and the control system 7 is connected to the nitrogen production device as described in Embodiment 1.

[0083] The control system 7 includes a temperature and pressure monitoring unit 7-1, and the temperature and pressure monitoring unit 7-1 is connected to a control unit.

[0084] The control system 7 further includes a flow meter 7-2, an oxygen concentration meter 7-3, and a purity control valve 7-4 that are connected in sequence. The flow meter 7-2 is connected to the output end of the separation membrane group 4, and the flow meter 7-2, the oxygen concentration meter 7-3, and the purity control valve 7-4 are connected to the control unit.

[0085] The control unit is also connected to a two-position three-way valve 6.

[0086] When the set purity is reached by the adjustment of the purity control valve 7-4, that is, when the oxygen content is lower than the set emission point, the gas is input to the usage point through the qualified gas production branch; while when the oxygen content is higher than the set emission point, that is, when the product gas does not reach the set purity, the emission branch automatically opens to discharge the excessive gas.

[0087] Before entering the membrane, a two-position three-way valve 6 is specially configured. During the actual use of the equipment, if nitrogen is not required in the early stage of operation, but clean compressed air is needed, the control unit can send a signal to the controller of the two-position three-way valve 6, control the operation of the two-position three-way valve 6 by outputting an electrical signal, convert the electrical signal into a pneumatic signal, and execute the opening / closing of the two-position three-way valve 6, effectively ensuring the use of clean compressed air and the free switching process of nitrogen production by the membrane module.

[0088] The control system 7 also includes a switching branch for automatic discharge of qualified gas, which is installed after the output end of the separation membrane module 4 and before the main air supply pipeline.

[0089] When the set purity is adjusted by the purity control valve 7-4, that is, when the oxygen content is lower than the set discharge point, the gas is input to the use point through the qualified gas production branch; when the oxygen content is higher than the set discharge point, that is, when the product gas does not reach the set purity, the discharge branch automatically opens to discharge the excessive gas.

[0090] As a preferred embodiment of this example:

[0091] The control system 7 also includes a gas flow characteristic monitoring and analysis unit 7-5.

[0092] The gas flow characteristic monitoring and analysis unit 7-5 includes a pressure sensor 7-5-1 arranged at the outlet of the nitrogen production device 2, a data collector 7-5-2 connected to the pressure sensor 7-5-1, a data analyzer 7-5-3 connected to the data collector 7-5-2, and a controller 7-5-4.

[0093] The controller 7-5-4 controls the operating parameters of the nitrogen production device according to the analysis results to achieve a stable and controllable gas source. The controller 7-5-4 controls the air compressor 1 to stop working.

[0094] The processing and analysis of the data analyzer 7-5-3 mainly include the following steps: First, the collected gas pressure signal is analyzed and decomposed, including the mean value of pressure fluctuation standard deviation Δp, and then analysis and judgment are carried out, as shown in the following formula.

[0095]

[0096] Among them, is the mean value of pressure fluctuation, Δp is the standard deviation of the mean value of pressure fluctuation, p i is the single measurement pressure value, and n is the number of measurements.

[0097] By analyzing the mean value of pressure fluctuation , the gas pressure fluctuation characteristics can be obtained, so as to judge the gas state. If the mean value of pressure fluctuation the flow state is stable; if the mean value of pressure fluctuation If the flow state is unstable, the operating parameters of the nitrogen generation device 2 can be adjusted to ensure the stable output of gas.

[0098] The standard deviation Δp of the pressure fluctuation represents the degree of dispersion of the pressure fluctuation. If the standard deviation is large, it means that the pressure fluctuations at each time point are quite different, and the instability of the flow may be relatively high. Therefore, when the standard deviation of the pressure fluctuation Δp > 0.2, the controller 7-5-4 controls the air compressor 1 to stop working to prevent equipment damage.

[0099] The data analyzer 7-5-3 processes and analyzes the collected data to obtain the dynamic change of the gas; the controller 7-5-4 controls the operating parameters of the nitrogen generation device according to the analysis result to achieve a stable and controllable gas source.

[0100] The gas flow characteristic monitoring and analysis unit 7-5 monitors and analyzes the output gas state data of the nitrogen generation device 2 in real time, and takes corresponding measures in a timely manner to adjust the operating parameters of the nitrogen generation device 2 to ensure the stable operation of the dual-medium compressed gas source device for underground coal mine drilling. This is of great significance for improving the drilling efficiency of the drill and ensuring the stability of the production process.

[0101] As a preference of this embodiment:

[0102] The temperature and pressure monitoring unit 7-1 includes:

[0103] The first temperature sensor 7-1-1 and the first pressure transmitter 7-1-2 installed at the air inlet of the air compressor 1.

[0104] The second temperature sensor 7-1-3 and the second pressure transmitter 7-1-4 installed at the air inlet end of the separation membrane module 4.

[0105] The third temperature sensor 7-1-5 and the third pressure transmitter 7-1-6 installed at the air outlet end of the separation membrane module 4.

[0106] The first temperature sensor 7-1-1 and the first pressure transmitter 7-1-2 detect the pressure and temperature of the raw air, the second temperature sensor 7-1-3 and the second pressure transmitter 7-1-4 detect the pressure and temperature of the air inlet of the membrane module, and the third temperature sensor 7-1-5 and the third pressure transmitter 7-1-6 detect the pressure and temperature of the air outlet of the membrane module.

[0107] As a preference of this embodiment:

[0108] It further includes a communication system 8 installed between the dual-medium compressed gas source device for underground coal mine drilling and the drill rig in the drill site.

[0109] The described communication system 8 includes a proximal electric control cabinet 8-1 and a first switch 8-2, a first PLC 8-3, an optical fiber transmitter 8-4, and a first touch screen 8-5 installed in the proximal electric control cabinet 8-1.

[0110] The described communication system 8 further includes a distal electric control cabinet 8-6 and a second switch 8-7, a second PLC 8-8, an optical fiber receiver 8-9, and a second touch screen 8-10 installed in the distal electric control cabinet 8-6.

[0111] The first PLC 8-3 in the proximal electric control cabinet 8-1 is connected to the first PLC 8-3 and the second PLC 8-8 in the distal electric control cabinet 8-6 through the first switch 8-2, the second switch 8-7, the optical fiber transmitter 8-4, and the optical fiber receiver 8-9 in the form of a bus, network cable, or optical fiber, enabling real-time and fast data communication between the gas source device and the drilling rig, including start / stop and setting instructions for the gas source device by construction personnel on the drilling rig side, and real-time monitoring of the sensing data of the gas source device.

[0112] Construction personnel issue control instructions through the first touch screen 8-5 or the second touch screen 8-10, including start, working mode switching, setting of the finished nitrogen concentration, and emergency stop, etc. After the proximal electric control cabinet 8-1 sends the control instructions through the optical fiber transmitter 8-4, the optical fiber receiver 8-9 in the distal electric control cabinet 8-6 receives the control instructions, processes and executes the corresponding instruction actions.

[0113] The described gas flow characteristic monitoring and analysis unit 7-5 is installed in the proximal electric control cabinet 8-1.

[0114] The communication system between the gas source device and the drilling rig in the drill field includes a switch, a PLC, an optical fiber transmitter, an optical fiber receiver, and a touch screen. The PLC in the proximal electric control cabinet is connected to the PLC in the distal electric control cabinet through the switch, the optical fiber transmitter, and the optical fiber receiver in the form of a bus, network cable, or optical fiber, enabling real-time and fast data communication between the gas source device and the drilling rig, including start / stop and setting instructions for the gas source device by construction personnel on the drilling rig side, and real-time monitoring of the sensing data of the gas source device. Construction personnel issue control instructions through the touch screen, including start, working mode switching, setting of the finished nitrogen concentration, and emergency stop, etc. After the proximal electric control cabinet sends the control instructions through the optical fiber transmitter, the optical fiber receiver in the distal electric control cabinet receives the control instructions, processes and executes the corresponding instruction actions.

[0115] Embodiment 3:

[0116] A method for a dual-medium compressed gas source device for underground coal mine drilling is completed using the dual-medium compressed gas source device for underground coal mine drilling as described in Embodiment 2.

[0117] First step, before the drilling crew starts the drilling operation, according to the requirements of the drilling process, the exhaust pressure of the air compressor 1 is set through the remote controller, the output pressure is selected, and the working mode of the nitrogen generation device is set, including air supply / nitrogen supply, and the product gas concentration index when nitrogen is supplied.

[0118] Second step, press the start button. The start command and set parameters are transmitted to the near-end electric control cabinet 8-1 of the nitrogen generation device via the bus or ring network. The system is started through the main electric control box. The first temperature sensor 7-1-1 and the first pressure transmitter 7-1-2 monitor the intake air temperature and pressure of the air compressor 1. If the intake air temperature and pressure exceed the standard, the main electric control box automatically stops emergently and gives an audible and visual alarm. If the intake air temperature and pressure are normal, the air compressor 1 starts to work, and the air source is filtered, deoiled, and purified in sequence.

[0119] Third step, the part of the nitrogen generation device after the air compressor is started.

[0120] Fourth step, the system monitors the gas temperature and pressure in the pipeline in real time to ensure that they always meet the set requirements. Before the gas pretreated by the air compressor 1 enters the separation membrane module 4, its intake air pressure, flow rate, and operating temperature are measured. If they exceed the set range, the system gives an alarm. If all indicators are normal, the system starts to run.

[0121] Fifth step, the nitrogen generation device performs actions according to the working mode set by the operator.

[0122] If it is the air supply mode, the two-way three-way valve 6 to the separation membrane module 4 end is closed for air supply. If it is the nitrogen supply mode, the two-way three-way valve 6 to the separation membrane module 4 end is opened, and the air source is introduced into the separation membrane module 4 for nitrogen-oxygen separation.

[0123] After the separation is completed, the nitrogen concentration in the product gas is detected. If the concentration reaches the artificially set threshold, nitrogen supply is carried out; otherwise, bypass evacuation is carried out to ensure that the product gas meets the concentration standard.

[0124] During the operation of the system, information such as gas pressure and temperature is sent to the second touch screen 8-10 of the remote electric control cabinet 8-6 via the bus or ring network for visualization, providing operation information for the drilling crew.

[0125] The above technical solutions are only the relatively optimal specific implementation manners of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be thought of by those skilled in the art within the technical scope disclosed by the present invention without creative labor are covered by the protection scope of the present invention.

Claims

1. A nitrogen generation device, comprising an air compressor (1), a gas-liquid separator (2), a filter (3), and a separation membrane module (4) that are connected in series, characterized in that, The described nitrogen generation device further includes a heat exchanger unit (5) installed between the filter (3) and the separation membrane module (4), and the air compressor (1) is communicated with the heat exchanger unit (5) through a lubricating oil path; A two-position three-way valve (6) is also installed between the heat exchanger unit (5) and the separation membrane module (4), and a compressed air output end is installed on the two-position three-way valve (6); An oxygen-rich gas output end is installed on the separation membrane module (4); The two-position three-way valve (6) is used to adjust the type of the output gas.

2. The nitrogen generation device according to claim 1, characterized in that, The filter (3) includes a precision filter (3-1), an ultra-precision filter (3-2), an activated carbon filter (3-3) and a particle filter (3-4) which are connected in sequence; The precision filter (3-1) is communicated with the gas-liquid separator (2), and the particle filter (3-4) is communicated with the heat exchanger unit (5).

3. The nitrogen generation device according to claim 2, characterized in that, The heat exchanger unit (5) includes a spiral plate heat exchanger unit and an intelligent temperature control valve installed on the spiral plate heat exchanger unit.

4. A dual-medium compressed gas source device for underground coal mine drilling, characterized in that, It includes a control system (7), and the control system (7) is connected to the nitrogen generation device according to any one of claims 1-3; The control system (7) includes a temperature and pressure monitoring unit (7-1), and the temperature and pressure monitoring unit (7-1) is connected to a control unit; The control system (7) further includes a flow meter (7-2), an oxygen concentration meter (7-3) and a purity control valve (7-4) which are connected in sequence, the flow meter (7-2) is communicated with the output end of the separation membrane module (4), and the flow meter (7-2), the oxygen concentration meter (7-3) and the purity control valve (7-4) are connected to the control unit; The two-position three-way valve (6) is connected to the control unit; The flow meter (7-2), the oxygen concentration meter (7-3) and the purity control valve (7-4) are connected to the control unit; The control system (7) further includes a switching branch for automatic discharge of qualified gas installed after the output end of the separation membrane module (4) and before the main air supply pipeline.

5. The dual-medium compressed air source device for underground coal mine drilling according to claim 4, characterized in that, The control system (7) further includes a gas flow characteristic monitoring and analysis unit (7-5); The gas flow characteristic monitoring and analysis unit (7-5) includes a pressure sensor (7-5-1) arranged at the outlet of the nitrogen generation device 2, a data collector (7-5-2) connected to the pressure sensor (7-5-1), a data analyzer (7-5-3) connected to the data collector (7-5-2) and a controller (7-5-4).

6. The dual-medium compressed gas source device for underground coal mine drilling according to claim 5, characterized in that, The temperature and pressure monitoring unit (7-1) includes: A first temperature sensor (7-1-1) and a first pressure transmitter (7-1-2) installed at the air inlet of the air compressor (1); A second temperature sensor (7-1-3) and a second pressure transmitter (7-1-4) installed at the air inlet end of the separation membrane module (4); A third temperature sensor (7-1-5) and a third pressure transmitter (7-1-6) installed at the air outlet end of the separation membrane module (4).

7. A dual-medium compressed gas source device for underground coal mine drilling as claimed in claim 5, characterized in that, It further includes a communication system (8) installed between the double-medium compressed air source device for underground coal mine drilling and the drill rig at the drill site; The described communication system (8) includes a proximal electric control cabinet (8-1) and a first switch (8-2), a first PLC (8-3), an optical fiber transmitter (8-4), and a first touch screen (8-5) installed in the proximal electric control cabinet (8-1). The described communication system (8) further includes a distal electric control cabinet (8-6) and a second switch (8-7), a second PLC (8-8), an optical fiber receiver (8-9), and a second touch screen (8-10) installed in the distal electric control cabinet (8-6). Connect the first PLC (8-3) in the proximal electric control cabinet (8-1) to the first PLC (8-3) and the second PLC (8-8) in the distal electric control cabinet (8-6) through the first switch (8-2), the second switch (8-7), the optical fiber transmitter (8-4), and the optical fiber receiver (8-9) in the form of a bus, network cable, or optical fiber. The described gas flow characteristic monitoring and analysis unit (7-5) is installed in the proximal electric control cabinet (8-1).

8. A method for a dual-medium compressed gas source device used in underground coal mine drilling, characterized in that, It is completed by using the dual-medium compressed gas source device for underground coal mine drilling described in any one of claims 4 to 7. First step, before the drilling construction personnel start the drilling operation, according to the requirements of the drilling process, set the exhaust pressure of the air compressor (1) through the remote control, select the output pressure, and set the working mode of the nitrogen production device (air supply / nitrogen supply) and the product gas concentration index when supplying nitrogen. Second step, press the start button. The start command and set parameters are transmitted to the proximal electric control cabinet (8-1) of the nitrogen production device through the bus or ring network. Start the system through the main electric control box. The first temperature sensor (7-1-1) and the first pressure transmitter (7-1-2) monitor the intake temperature and pressure of the air compressor (1). If the intake temperature and pressure exceed the standard, the main electric control box automatically stops emergently and gives an audible and visual alarm. If the intake temperature and pressure are normal, the air compressor (1) starts to work and performs processes such as filtering, oil removal, and purification on the gas source in sequence. Third step, the part of the nitrogen production device after the air compressor starts. Fourth step, the system monitors the gas temperature and pressure in the pipeline in real time to ensure that they always meet the set requirements. Before the gas pretreated by the air compressor (1) enters the separation membrane module (4), measure its intake pressure, flow rate, and operating temperature. If it exceeds the set range, the system issues an alarm. If all indicators are normal, the system starts to run. Fifth step, the nitrogen production device performs actions according to the working mode set by the operator. If it is in the air supply mode, close the two-way three-way valve (6) to the nitrogen production device end and supply gas. If it is in the nitrogen supply mode, open the two-way three-way valve (6) to the nitrogen production device end, and the gas source is introduced into the separation membrane module (4) for nitrogen-oxygen separation. After the separation is completed, detect the nitrogen concentration in the product gas. If the concentration reaches the artificially set threshold, supply nitrogen. Otherwise, perform bypass evacuation to ensure that the product gas meets the concentration standard. The information such as the gas pressure and temperature during the operation of the system is sent to the second touch screen (8-10) of the distal electric control cabinet (8-6) through the bus or ring network for visualization, providing operation information for the drilling construction personnel.

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