Improved intelligent normal-pressure long-time coal seam gas content measuring device and method

Abstract

The invention discloses an improved intelligent normal-pressure long-time coal seam gas content measuring device and method.An outer thread is arranged on the inner wall of the top of a coal sample measuring tank body of the measuring device, an inner thread meshed with the outer thread is arranged on the inner wall of the bottom of a tank cover, and the tank cover is detachably connected with the tank body through meshing of the outer thread and the inner thread; an isolation plate is arranged above the internal thread of the tank cover, a mounting cavity is formed between the upper part of the isolation plate and the inner wall of the top of the tank cover, and each module is arranged in the mounting cavity; the high-capacity intrinsically safe battery is arranged on the bottom plate of the placing box, and the coal sample measuring tank is wirelessly charged all the time in the process of conveying the coal sample measuring tank to a laboratory, so that the coal sample measuring tank is kept in an electrified state. According to the measuring device, heavy matching tools do not need to be carried, tedious operation steps are avoided, the working intensity is greatly reduced, and the technical problems that an existing measuring device and method are large in coal seam gas content error, high in working intensity and serious in device gas leakage are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine production safety, and in particular, relates to an improved intelligent normal pressure long-time coal seam gas content measuring device and method. Background Art

[0002] Coalbed methane (CBM) is a gaseous mineral associated with coal and is a clean energy source. However, it is also the main factor causing mine disasters and accidents. Once a gas disaster occurs, it will cause significant casualties and property losses to the mine. At the same time, coalbed methane is also a major greenhouse gas, and its greenhouse effect is more than 20 times that of carbon dioxide. Large amounts of gas emissions have put great pressure on my country's achievement of its "dual carbon goals". Therefore, whether from the development of gas resources or from the prevention and control of gas disasters and greenhouse gas emissions, key parameters such as gas content should be measured to evaluate key data such as gas resources, reserves, and emissions.

[0003] In order to accurately measure the gas content of coal seams, high-precision gas content measuring devices and scientific and reasonable measuring methods are essential. The coal seam gas content measuring methods currently widely used in my country mainly include drainage gas collection method, rapid gas content measuring method, etc. However, during the measurement process of these methods, it is necessary to carry bulky coal sample measuring tanks, gas desorption instruments, supporting tools and other equipment to the site to measure the amount of natural desorption gas underground, and then seal the device tightly and send it to the ground laboratory for subsequent measurement, or seal the device and perform rapid gas content measurement underground; However, these methods have technical problems such as large gas content measurement errors, high work intensity, time-consuming and labor-intensive, serious gas leakage of the device, and certain safety hazards.

[0004] The Chinese patent application No. 202411566902.1 discloses an intelligent normal pressure long-time coal seam gas content determination device and method, which adopts a normal pressure long-time design, and effectively improves the accuracy of coal seam gas content measurement by keeping the gas pressure in the coal sample determination tank at normal pressure to avoid equipment leakage, and setting a battery and flow automatic determination unit on the coal sample determination tank cover. However, the design embeds batteries, gas flow measurement devices, flow control valves, data storage devices, computing chips and other units in the coal sample determination tank cover, but in the experiments over the past two months, the following problems were found: Due to the extremely narrow space of the coal sample determination tank cover, the capacity of the embedded battery is very limited, and the power supply time for other modules of the coal sample determination tank is greatly limited, and the power supply time will be relatively short, resulting in the coal sample determination tank being powered off before it is sent from the underground to the laboratory on the well, resulting in the loss of coal sample gas desorption data, resulting in the inability to accurately determine the coal seam gas content, which has an adverse impact on coal seam gas resource development, gas disaster prevention and control and other work. Therefore, it is urgent to improve the original coal seam gas content measurement device and method, effectively improve the measurement accuracy of coal seam gas content, and lay the foundation for mine safety production and other work. Summary of the invention

[0005] The purpose of the present invention is to provide an improved intelligent normal pressure long-time coal seam gas content measuring device and method with accurate measurement, low work intensity, time and labor saving, high safety, and ensuring full-process measurement data.

[0006] To achieve the above object, the present invention adopts the following technical solution: An improved intelligent normal pressure long-time coal seam gas content measuring device comprises a placement box, in which a plurality of coal sample measuring tanks are stored, each coal sample measuring tank comprises a tank body, a tank cover, a gas flow measuring module, an environmental parameter measuring module, a parameter input and display module, a data storage and calculation module, a data transmission module and a small-capacity intrinsically safe battery; an external thread is arranged on the top inner wall of the tank body, an internal thread engaged with the external thread is arranged on the bottom inner wall of the tank cover, and the tank cover is detachably connected to the tank body through the engagement of the external thread and the internal thread; An isolation plate is arranged above the internal thread of the tank cover, and an installation cavity is formed between the isolation plate and the inner wall of the top of the tank cover. The gas flow measurement module, the environmental parameter measurement module, the data storage and calculation module, the data transmission module, and the small-capacity intrinsically safe battery are all installed in the installation cavity, and the parameter input and display module is arranged on the top surface of the tank cover; An exhaust hole is arranged on the outer wall of the installation cavity, an air inlet hole is arranged on the isolation plate, and the exhaust hole and the air inlet hole are connected through a pipe assembly, and the pipe assembly includes an air intake vertical pipe, a shunt pipe, a first transverse pipe, a second transverse pipe, a third transverse pipe, a manifold, and an exhaust transverse pipe. The lower end of the air intake vertical pipe is connected to the air intake port, the upper end of the air intake vertical pipe is connected to the shunt pipe, the front, middle, and rear parts of the shunt pipe are respectively connected to the left ends of the first transverse pipe, the second transverse pipe, and the third transverse pipe, the right ends of the first transverse pipe, the second transverse pipe, and the third transverse pipe are respectively connected to the front, middle, and rear parts of the manifold, the right end of the exhaust transverse pipe is connected to the exhaust port, and the left end of the exhaust transverse pipe is connected to the manifold; A gas flow measurement module is connected to the first transverse pipe, the second transverse pipe and the third transverse pipe. The gas flow measurement module includes a first electromagnetic flowmeter, a second electromagnetic flowmeter and a third electromagnetic flowmeter connected in parallel, and the range of the first electromagnetic flowmeter is less than the range of the second electromagnetic flowmeter and less than the range of the third electromagnetic flowmeter.

[0007] The tank body and tank cover are made of flame-retardant and antistatic PA plastic. The tank body is a cone that is thick at the top and thin at the bottom, and its minimum outer diameter at the bottom is 60mm, the minimum wall thickness is 3mm, the minimum outer diameter at the top is 70mm, the maximum wall thickness is 5mm, the height of the tank body is 120-140mm, the total height of the tank cover and the tank body is 160-200mm, and the height of the external thread is 20-30mm; The height of the tank cover is 40-60 mm, the wall thickness of the tank cover is 4-6 mm, the outer diameter of the tank cover is 60-80 mm, an annular groove is arranged on the inner wall between the isolation plate of the tank cover and the top of the internal thread, and a wide rubber pad is installed in the annular groove.

[0008] The top of the placement box is open and a box cover is provided on one side by rotating through hinges. A plurality of positioning grooves for placing the tank body are provided on the upper surface of the bottom plate of the placement box. The plurality of positioning grooves are arranged in a rectangular array on the bottom plate. Cotton cloth is provided in the positioning groove as a lining. The placement box is made of flame-retardant and antistatic PA plastic. A rectangular positioning plate is horizontally provided in the middle and upper part of the placement box. Positioning holes corresponding to the positioning grooves are provided on the positioning plate. The positioning plate is made of lightweight flame-retardant and antistatic polyurethane material. The interior of the cover plate is a hollow sandwich structure. A transmitting end charging coil corresponding to the positioning holes is provided inside the hollow sandwich structure. The transmitting end charging coil is used for wireless charging of the small-capacity intrinsically safe battery in the tank cover. A large-capacity intrinsically safe battery is embedded in the bottom plate of the placement box. The large-capacity intrinsically safe battery is connected to the transmitting end charging coil through wires provided in the box cover and the side plate of the placement box. A charging switch protruding inwardly from the inner wall of the side plate of the placement box is provided on the wire. A charging interface for charging the large-capacity intrinsically safe battery and a dust plug matching the charging interface are provided on the inner wall of the side plate of the placement box.

[0009] The environmental parameter measurement module includes a temperature sensor and an atmospheric pressure sensor, the data storage and calculation module includes a chip and a memory card, and the data transmission module is a Bluetooth module. The temperature sensor, atmospheric pressure sensor, memory card, and Bluetooth module are all connected to the chip, the Bluetooth module is connected to the PC, and the chip is connected to the external software system to store and transmit information through the software system.

[0010] The parameter input and display module includes a touch screen with input function, the touch screen is connected to the chip, the touch screen is embedded on the top outer wall of the tank cover, the touch screen is also connected to a touch switch, the touch switch is embedded on the top outer wall of the tank cover and is located on the lower side of the touch screen; the air intake vertical pipe and the exhaust horizontal pipe are filled with cotton yarn columns; The small-capacity intrinsically safe battery includes a parallel explosion-proof battery pack for powering each module. A receiving-end charging coil corresponding to the transmitting-end charging coil is arranged inside the explosion-proof battery pack.

[0011] The intelligent method for determining the gas content in a coal seam under normal pressure for a long time is implemented by using the improved intelligent device for determining the gas content in a coal seam under normal pressure for a long time, and comprises the following steps: (1) Test an improved intelligent normal pressure long-term coal seam gas content measuring device to ensure the normal operation of the device; (2) At least two sampling points are selected at the same measurement location, and drilling holes are constructed to sample the gas content in the coal seam; (3) Turn on the touch screen through the touch switch, and input the information of sampling location, sampling personnel, sampling date, and coal sample exposure time through the touch screen; (4) After drilling to the designed depth, collect coal samples at the hole mouth. After filling the tank body with the collected coal samples, wipe the coal dust on the tank mouth and the inner wide rubber pad of the tank cover. After wiping, install the tank cover on the tank body through the internal and external threads to ensure the sealing of the tank body; (5) The gas flow measurement module is turned on by the software system, and the software system records the gas desorption amount of the coal sample and the corresponding desorption time, ambient temperature, and atmospheric pressure; (6) After steps (1) to (5) are completed, the box cover is opened, the coal sample measuring tank is placed in the corresponding positioning hole and positioning groove in the placing box, the charging switch is turned on, and the box cover is closed. The transmitting end charging coil in the box cover corresponds to the receiving end charging coil in the tank cover, and the large-capacity intrinsically safe battery charges the small-capacity intrinsically safe battery through wireless charging; (7) The placement box containing the coal sample test tank is sent to the laboratory. During the transportation of the placement box, wireless charging is carried out continuously to ensure the subsequent residual gas content determination and the continuous completion of the gas desorption determination; (8) Turn on the Bluetooth module through the touch screen, connect to the PC in the laboratory, upload the desorption parameters to the PC, and calculate the measured coal seam gas content by combining the degassing volume, coal sample weight, industrial analysis of coal and gas sample components measured in the laboratory.

[0012] The specific operation process of step (1) is: check whether the tank body and the tank cover are damaged, check whether the wide rubber pad of the tank cover is broken, check whether the cotton yarn column in the intake vertical pipe and the exhaust horizontal pipe is intact, and check whether the software system can operate normally; The specific implementation process of step (2) is as follows: the distance between two sampling points is ≥5m; when sampling is carried out by borehole sampling, the sampling depth is ≥12m; when sampling is carried out by borehole sampling, the depth of the coal hole section is ≥5m.

[0013] The coal sample collected in step (4) is a dry coal sample free of gangue; In step (5), the chip automatically selects the flow meter and records the time of natural gas desorption of the coal sample, the amount of gas desorption, the ambient temperature and the atmospheric pressure.

[0014] In step (6), the placement box is a rectangular hollow shell structure of 380mm×250mm×280mm, and six positioning grooves are provided on the bottom plate of the placement box to place six coal sample measurement tanks; an air pressure balance groove connected to the outside is provided on the upper edge of the side plate of the placement box to ensure that the inside of the placement box remains connected to the outside, so that the coal sample measurement tank is in a normal pressure state, and the gas desorbed from the coal sample is discharged out of the placement box in time.

[0015] In step (7), when it is necessary to carry out subsequent residual gas content determination, the coal sample needs to be degassed, weighed and the gas sample components analyzed.

[0016] By adopting the above technical solution, the present invention achieves the purpose of providing power to the coal sample measuring tank for a long time by arranging a large-capacity intrinsically safe battery in the bottom plate of the placement box, and solves the problems of short system power supply time, missing gas flow measurement data, and inaccurate gas content measurement caused by small battery capacity in the existing gas content measuring device. Before use, the large-capacity intrinsically safe battery is fully charged through the charging interface (Type C) on the well, so that during use, the large-capacity intrinsically safe battery can continuously power the small-capacity intrinsically safe battery on the top of the coal sample measuring tank.

[0017] The present invention automatically measures parameters such as gas flow, desorption time, ambient temperature, atmospheric pressure, etc., and there is no need for measuring personnel to carry bulky desorption instruments, or matching wrenches, stopwatches, thermometers, barometers, recording paper and pens, etc., which greatly reduces the labor intensity of workers.

[0018] Since the box is always at normal pressure and there is no high pressure in the tank, there is no need to use wrenches or other tools to tighten the device very tightly, which saves time and effort, greatly reduces the occurrence of gas leakage in the device, reduces the measurement error of the instrument, and effectively improves the measurement accuracy of gas content.

[0019] The gas desorbed from the coal sample is discharged naturally, and there is no air holding or high-pressure state in the device, which solves the problem of gas leakage due to poor sealing in existing devices. In the whole process, no manual reading is required, avoiding human operation errors, thereby effectively improving the measurement accuracy of coal seam gas content.

[0020] The gas flow measurement module consists of 3 groups of high-precision electromagnetic flowmeters, which changes the disadvantages of the previous gas desorption measurement device using a single flowmeter or dual flowmeters, and well balances the measurement range and measurement accuracy, reduces instrument errors, and further improves measurement accuracy.

[0021] The present invention is based on the instantaneous gas diffusion coefficient through the data storage and calculation module, which is closer to the actual situation of the coal seam gas desorption process; the present invention automatically calculates the amount of gas loss in the sampling process based on the instantaneous gas diffusion coefficient, effectively reduces the method error from the theoretical basis level, the calculation process is more intelligent, and the calculation result is more accurate, which further improves the measurement accuracy of the gas content.

[0022] The data storage and calculation module automatically measures relevant parameters such as ambient temperature and atmospheric pressure, and automatically converts them into gas desorption amount under standard conditions through built-in programs, which improves the automation and intelligence level of coal seam gas content measurement, greatly simplifies the gas content measurement process, shortens the measurement time, and improves the measurement accuracy.

[0023] To sum up, the present invention has a scientific principle and is easy to operate. It improves the problem of short power supply time of the original device resulting in missing key data and inaccurate gas content measurement, can achieve the purpose of long-term power supply of the system, avoids cumbersome operating steps, greatly reduces work intensity, and improves the intelligence and automation of coal seam gas content through corresponding measurement processes and calculation methods, and effectively solves the technical problems of short power supply time, missing key data, large gas content error, high work intensity, time-consuming and labor-intensive, serious gas leakage of the device and certain safety hazards in the existing measurement devices and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the coal sample determination tank; Figure 3 It is a schematic diagram of the structure of the tank; Figure 4 It is a structural diagram of the can cover from the first perspective; Figure 5 It is a structural diagram of the can cover from the second perspective; Figure 6 It is a schematic diagram of the structure of the pipeline assembly; Figure 7 It is a schematic diagram of the structure of the pipeline assembly and the small-capacity intrinsically safe battery; Figure 8 yes Figure 1 A schematic diagram of the top view of the horizontally arranged positioning plate placed in the box. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0026] Embodiment 1 like Figure 1-8 As shown, an improved intelligent normal pressure long-time coal seam gas content measuring device comprises a placement box 4, in which a plurality of coal sample measuring tanks 21 are stored, each coal sample measuring tank 21 comprises a tank body 1, a tank cover 2, a gas flow measuring module 3, an environmental parameter measuring module, a parameter input and display module, a data storage and calculation module, a data transmission module and a small-capacity intrinsically safe battery 22; an external thread 5 is arranged on the top inner wall of the tank body 1, an internal thread 6 meshed with the external thread 5 is arranged on the bottom inner wall of the tank cover 2, and the tank cover 2 is detachably connected to the tank body 1 through the meshing of the external thread 5 and the internal thread 6; An isolation plate 7 is arranged above the internal thread 6 of the tank cover 2, and an installation cavity is formed between the isolation plate 7 and the inner wall of the top of the tank cover 2. The gas flow measurement module 3, the environmental parameter measurement module, the data storage and calculation module, the data transmission module, and the small-capacity intrinsically safe battery 22 are all installed in the installation cavity, and the parameter input and display module is arranged on the outer wall of the top of the tank cover 2; An exhaust hole 8 is provided on the outer wall of the installation cavity, and an air inlet hole 9 is provided on the isolation plate 7. The exhaust hole 8 and the air inlet hole 9 are connected by a pipeline assembly, and the pipeline assembly includes an intake vertical pipe 10, a shunt pipe 11, a first transverse pipe 12, a second transverse pipe 13, a third transverse pipe 14, a manifold 15, and an exhaust transverse pipe 16. The lower end of the intake vertical pipe 10 is connected to the air inlet, and the upper end of the intake vertical pipe 10 is connected to the shunt pipe 11. The front, middle and rear parts of the shunt pipe 11 are respectively connected to the first transverse pipe 12, the second transverse pipe 13 and the left end of the third transverse pipe 14. The right ends of the first transverse pipe 12, the second transverse pipe 13 and the third transverse pipe 14 are respectively connected to the front, middle and rear parts of the manifold 15. The right end of the exhaust transverse pipe 16 is connected to the exhaust port, and the left end of the exhaust transverse pipe 16 is connected to the manifold 15. The first transverse pipe 12, the second transverse pipe 13, and the third transverse pipe 14 are all connected with a gas flow measurement module 3, which includes a first electromagnetic flowmeter, a second electromagnetic flowmeter, and a third electromagnetic flowmeter connected in parallel, and the range of the first electromagnetic flowmeter is less than the range of the second electromagnetic flowmeter and less than the range of the third electromagnetic flowmeter, that is, the first electromagnetic flowmeter is a micro-flow gas flowmeter with the smallest range, the second electromagnetic flowmeter has a middle range, and the third electromagnetic flowmeter has the largest range; the combined range of the three flowmeters is 0.2 cm 3 / min~700cm 3 / min. When the gas desorption measurement starts, the system defaults to measuring the gas desorption amount through the second electromagnetic flowmeter channel; when the gas desorption flow is greater than the second electromagnetic flowmeter range, the system automatically switches to the third electromagnetic flowmeter for desorption measurement, and turns off the first electromagnetic flowmeter and the second electromagnetic flowmeter; when the gas desorption flow is less than the second electromagnetic flowmeter range, the system automatically switches to the first electromagnetic flowmeter for desorption measurement, and turns off the second electromagnetic flowmeter and the third electromagnetic flowmeter; when the gas desorption flow is less than the first electromagnetic flowmeter range, each flowmeter is turned off, and then the first electromagnetic flowmeter is turned on once every minute to record the gas desorption amount and desorption time; if the flow is still less than the first electromagnetic flowmeter range within 1 minute, the flowmeter closing time is increased to 2 minutes, and so on. Each flowmeter is connected to the built-in chip and memory card through leads, Figure 5 and Figure 6 The combined display of the chip and the memory card is 17. The memory card automatically records the gas desorption amount and desorption time. The chip automatically calculates the instantaneous gas diffusion coefficient of the coal sample at different times through the calculation program, and regresses the gas desorption data according to parameters such as the desorption amount, desorption time, ambient temperature, and the gas diffusion coefficient of atmospheric pressure at each time, so as to accurately calculate the amount of gas loss in the sampling process.

[0027] The materials of the tank body 1 and the tank cover 2 are both flame-retardant and antistatic PA plastic; The tank body 1 is a cone that is thick at the top and thin at the bottom, and its minimum outer diameter at the bottom is 60 mm, the minimum wall thickness is 3 mm, the minimum outer diameter at the top is 70 mm, the maximum wall thickness is 5 mm, the height of the tank body 1 is 120-140 mm, preferably 120 mm, the total height of the tank cover 2 and the tank body 1 is 160-200 mm, preferably 170 mm, and the height of the external thread 5 is 20-30 mm; The height of the tank cover 2 is 40-60 mm, preferably 50 mm, the wall thickness of the tank cover 2 is 4-6 mm, preferably 5 mm, the outer diameter of the tank cover 2 is 60-80 mm, preferably 70 mm, and an annular groove is provided on the inner wall between the isolation plate 7 of the tank cover 2 and the top of the internal thread 6, and a wide rubber pad is installed in the annular groove.

[0028] The top of the placement box 4 is open and a box cover 24 is provided on one side for rotation through a hinge 23. The upper surface of the bottom plate 25 of the placement box 4 is provided with a plurality of positioning grooves for placing the tank body 1. The plurality of positioning grooves are arranged in a rectangular array on the bottom plate 25. Cotton cloth is provided in the positioning groove as a lining. The placement box 4 is made of flame-retardant and antistatic PA plastic. A rectangular positioning plate 26 is horizontally provided in the middle and upper part of the placement box 4. Positioning holes 27 corresponding to the upper and lower positioning grooves are opened on the positioning plate 26. The positioning plate 26 is made of a lightweight flame-retardant and antistatic polyurethane material; the interior of the cover plate is a hollow sandwich structure, and a A transmitting-end charging coil 28 is arranged one-to-one with the positioning holes 27, and is used for wirelessly charging the small-capacity intrinsically safe battery 22 in the tank cover 2; a large-capacity intrinsically safe battery is embedded in the bottom plate 25 of the placement box 4, and the large-capacity intrinsically safe battery is connected to the transmitting-end charging coil 28 via a wire 29 arranged in the box cover 24 and the side plate of the placement box 4, and a charging switch 30 is provided on the wire 29 and protrudes inwardly from the inner wall of the side plate of the placement box 4, and a charging interface 31 for charging the large-capacity intrinsically safe battery and a dust plug matching the charging interface 31 are provided on the inner wall of the side plate of the placement box 4.

[0029] The environmental parameter measurement module includes a temperature sensor and an atmospheric pressure sensor, and the data storage and calculation module includes a chip and a memory card. Figure 5 and Figure 6 The chip and the memory card are displayed as 17, the data transmission module is a Bluetooth module 18, the temperature sensor, the atmospheric pressure sensor, the memory card, and the Bluetooth module 18 are all connected to the chip, wherein the Bluetooth module 18 can be connected to a PC, and the chip is connected (in addition to the mechanical connection, the connection also includes electrical connection and signal connection, the electrical connection is through wires or data cables, etc., and the signal connection is wireless connection) to an external software system, and information is stored and transmitted through the software system.

[0030] The parameter input and display module includes a touch display screen 19 with input function, the touch display screen 19 is connected to the chip, the touch display screen 19 is embedded on the top outer wall of the tank cover 2, and the touch display screen 19 is also connected to a touch switch 20, which is embedded on the top outer wall of the tank cover 2 and is located on the lower side of the touch display screen 19.

[0031] The air intake vertical pipe 10 and the exhaust cross pipe 16 are filled with cotton yarn columns to prevent the coal dust in the tank from clogging the exhaust hole 8.

[0032] The small-capacity intrinsically safe battery 22 includes a parallel explosion-proof battery pack, which is used to power each module. The explosion-proof battery pack is provided with a receiving end charging coil corresponding to the transmitting end charging coil 28 to realize the wireless charging function. The small-capacity intrinsically safe battery 22 is used to power the coal sample tank 21 before the coal sample is collected from the underground site to the ground laboratory for residual gas content determination. The device automatically determines parameters such as gas flow, desorption time, ambient temperature, atmospheric pressure, etc., and no longer requires the measurement personnel to carry a bulky desorption instrument, nor does it require matching wrenches, stopwatches, thermometers, barometers, recording paper and pens, etc., which greatly reduces the labor intensity of workers.

[0033] Since the coal sample measuring tank 21 is always at normal pressure, there is no high pressure state in the tank, and there is no need to use tools such as wrenches to tighten the coal sample measuring tank 21 very tightly, which saves time and effort, greatly reduces the occurrence of gas leakage in the coal sample measuring tank 21, reduces the measurement error of the instrument, and effectively improves the measurement accuracy of the gas content. The gas desorbed from the coal sample is discharged naturally, and the gas in the coal sample measuring tank 21 does not have a breath-holding or high-pressure state, which solves the problem of gas leakage caused by poor sealing in the existing device, and no manual reading is required during the whole process, avoiding human operation errors, thereby effectively improving the measurement accuracy of the coal seam gas content. The gas flow measurement module 3 is composed of 3 groups of high-precision electromagnetic flowmeters, which changes the drawbacks of the previous gas desorption measuring device using a single flowmeter or a dual flowmeter, and well balances the measurement range and measurement accuracy, reduces the instrument error, and further improves the measurement accuracy. At present, the gas loss amount in the sampling process is based on the Barrell formula, and the loss amount is calculated based on a fixed diffusion coefficient, which is inconsistent with the actual coal sample gas desorption process, resulting in a large calculation error. The device and method are closer to the actual situation of coal seam gas desorption process through data storage and calculation module based on instantaneous gas diffusion coefficient; the device automatically calculates the amount of gas loss in the sampling process based on the instantaneous gas diffusion coefficient, effectively reducing the method error from the theoretical basis level, the calculation process is more intelligent, and the calculation result is more accurate, further improving the accuracy of gas content measurement. The data storage and calculation module automatically measures relevant parameters such as ambient temperature and atmospheric pressure, and automatically converts them into gas desorption under standard conditions through a built-in program, which improves the automation and intelligence of coal seam gas content measurement, greatly simplifies the gas content measurement process, shortens the measurement time, and improves the measurement accuracy. The coal sample measurement tank 21 of the present application is easy to operate, avoids cumbersome operating steps, greatly reduces the work intensity, and improves the automation of coal seam gas content through corresponding measurement processes and calculation methods, effectively solving the technical problems of large gas content error, high work intensity, time-consuming and labor-intensive, serious device leakage, and certain safety hazards in existing measurement devices and methods.

[0034] Embodiment 2 The intelligent method for determining the gas content in coal seams under normal pressure for a long time is implemented based on the above-mentioned improved intelligent device for determining the gas content in coal seams under normal pressure for a long time, and comprises the following steps: (1) Test an improved intelligent normal pressure long-term coal seam gas content measuring device to ensure the normal operation of the device; (2) At least two sampling points are selected at the same measurement location, and drilling holes are constructed to sample the gas content in the coal seam; (3) The touch display screen 19 is turned on by the touch switch 20. The touch display screen 19 is an OLED touch screen, and the information of the sampling location, sampling personnel, sampling date, and coal sample exposure time is input through the touch display screen 19. A light-touch pressing system main switch is set on the outer wall of the top of the tank cover 2 to realize the opening and closing of the system.

[0035] (4) After drilling to the designed depth, collect coal samples at the hole mouth. After filling the tank body 1 with the collected coal samples, wipe the coal dust on the tank mouth of the tank body 1 and the inner wide rubber pad of the tank cover 2. After wiping, cover the tank cover 2 on the tank body 1 through the internal thread 6 and the external thread 5 to ensure the sealing of the tank body 1; (5) The gas flow measurement module 3 is turned on by the software system, and the software system starts to record the gas desorption amount of the coal sample and the corresponding desorption time, ambient temperature, and atmospheric pressure; (6) After steps (1) to (5) are completed, the box cover 24 is opened, the coal sample measuring tank is placed in the corresponding positioning hole 27 and positioning groove in the placement box, the charging switch 30 is turned on, and the box cover 24 is closed. The transmitting end charging coil 28 in the box cover 24 corresponds to the receiving end charging coil in the tank cover 2, and the large-capacity intrinsically safe battery charges the small-capacity intrinsically safe battery 22 by wireless charging. (7) The placement box containing the coal sample test tank is sent to the laboratory. During the transportation of the placement box, wireless charging is carried out continuously to ensure the subsequent residual gas content determination and the continuous completion of the gas desorption determination; (8) Turn on the Bluetooth module 18 by touching the display screen 19, connect to the PC in the laboratory, upload the desorption parameters to the PC, and calculate the measured coal seam gas content by combining the degassing volume, coal sample weight, industrial analysis of coal, and gas sample components measured in the laboratory.

[0036] The specific operation process of step (1) is: check whether the tank body 1 and the tank cover 2 are damaged, check whether the wide rubber pad of the tank cover 2 is broken, check whether the cotton yarn columns in the intake vertical pipe 10 and the exhaust horizontal pipe 16 are intact, and check whether the software system can operate normally; The specific implementation process of step (2) is as follows: the distance between two sampling points is ≥5m; when sampling is carried out by borehole sampling, the sampling depth is ≥12m; when sampling is carried out by borehole sampling, the depth of the coal hole section is ≥5m.

[0037] The coal sample collected in step (4) is a dry coal sample free of gangue; In step (5), the chip automatically selects the flow meter and records the time of natural gas desorption of the coal sample, the amount of gas desorption, the ambient temperature and the atmospheric pressure.

[0038] In step (6), the placement box 4 is a rectangular hollow shell structure of 380mm×250mm×280mm, and six positioning grooves are provided on the bottom plate 25 of the placement box 4 to place six coal sample determination tanks 21; the upper edge of the side plate of the placement box 4 is provided with an air pressure balance groove 32 connected to the outside world to ensure that the inside of the placement box 4 remains connected to the outside world, so that the coal sample determination tank 21 is in a normal pressure state, and the gas desorbed from the coal sample is discharged out of the placement box 4 in time.

[0039] In step (7), when it is necessary to carry out subsequent residual gas content determination, the coal sample needs to be degassed, weighed and the gas sample components analyzed.

[0040] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An improved intelligent normal pressure long-time coal seam gas content measuring device, characterized in that: It comprises a storage box, in which a plurality of coal sample measuring tanks are stored, each coal sample measuring tank comprising a tank body, a tank cover, a gas flow measuring module, an environmental parameter measuring module, a parameter input and display module, a data storage and calculation module, a data transmission module and a small-capacity intrinsically safe battery; the top inner wall of the tank body is provided with an external thread, the bottom inner wall of the tank cover is provided with an internal thread engaged with the external thread, and the tank cover is detachably connected to the tank body through the engagement of the external thread and the internal thread; An isolation plate is arranged above the internal thread of the tank cover, and an installation cavity is formed between the isolation plate and the inner wall of the top of the tank cover. The gas flow measurement module, the environmental parameter measurement module, the data storage and calculation module, the data transmission module, and the small-capacity intrinsically safe battery are all installed in the installation cavity, and the parameter input and display module is arranged on the top surface of the tank cover; An exhaust hole is arranged on the outer wall of the installation cavity, an air inlet hole is arranged on the isolation plate, and the exhaust hole and the air inlet hole are connected through a pipe assembly, and the pipe assembly includes an air intake vertical pipe, a shunt pipe, a first transverse pipe, a second transverse pipe, a third transverse pipe, a manifold, and an exhaust transverse pipe. The lower end of the air intake vertical pipe is connected to the air intake port, the upper end of the air intake vertical pipe is connected to the shunt pipe, the front, middle, and rear parts of the shunt pipe are respectively connected to the left ends of the first transverse pipe, the second transverse pipe, and the third transverse pipe, the right ends of the first transverse pipe, the second transverse pipe, and the third transverse pipe are respectively connected to the front, middle, and rear parts of the manifold, the right end of the exhaust transverse pipe is connected to the exhaust port, and the left end of the exhaust transverse pipe is connected to the manifold; A gas flow measurement module is connected to the first transverse pipe, the second transverse pipe and the third transverse pipe. The gas flow measurement module includes a first electromagnetic flowmeter, a second electromagnetic flowmeter and a third electromagnetic flowmeter connected in parallel, and the range of the first electromagnetic flowmeter is less than the range of the second electromagnetic flowmeter and less than the range of the third electromagnetic flowmeter.

2. According to claim 1, an improved intelligent normal pressure long-time coal seam gas content measuring device is characterized in that: The tank body and tank cover are made of flame-retardant and antistatic PA plastic. The tank body is a cone that is thick at the top and thin at the bottom, and its minimum outer diameter at the bottom is 60mm, the minimum wall thickness is 3mm, the minimum outer diameter at the top is 70mm, the maximum wall thickness is 5mm, the height of the tank body is 120-140mm, the total height of the tank cover and the tank body is 160-200mm, and the height of the external thread is 20-30mm; The height of the tank cover is 40-60 mm, the wall thickness of the tank cover is 4-6 mm, the outer diameter of the tank cover is 60-80 mm, an annular groove is arranged on the inner wall between the isolation plate of the tank cover and the top of the internal thread, and a wide rubber pad is installed in the annular groove.

3. The improved intelligent normal pressure long-time coal seam gas content measuring device according to claim 2 is characterized by: The top of the placement box is open and a box cover is provided on one side by rotating through hinges. A plurality of positioning grooves for placing the tank body are provided on the upper surface of the bottom plate of the placement box. The plurality of positioning grooves are arranged in a rectangular array on the bottom plate. Cotton cloth is provided in the positioning groove as a lining. The placement box is made of flame-retardant and antistatic PA plastic. A rectangular positioning plate is horizontally provided in the middle and upper part of the placement box. Positioning holes corresponding to the positioning grooves are provided on the positioning plate. The positioning plate is made of lightweight flame-retardant and antistatic polyurethane material. The interior of the cover plate is a hollow sandwich structure. A transmitting end charging coil corresponding to the positioning holes is provided inside the hollow sandwich structure. The transmitting end charging coil is used for wireless charging of the small-capacity intrinsically safe battery in the tank cover. A large-capacity intrinsically safe battery is embedded in the bottom plate of the placement box. The large-capacity intrinsically safe battery is connected to the transmitting end charging coil through wires provided in the box cover and the side plate of the placement box. A charging switch protruding inwardly from the inner wall of the side plate of the placement box is provided on the wire. A charging interface for charging the large-capacity intrinsically safe battery and a dust plug matching the charging interface are provided on the inner wall of the side plate of the placement box.

4. The improved intelligent normal pressure long-time coal seam gas content measuring device according to claim 3 is characterized by: The environmental parameter measurement module includes a temperature sensor and an atmospheric pressure sensor, the data storage and calculation module includes a chip and a memory card, and the data transmission module is a Bluetooth module. The temperature sensor, atmospheric pressure sensor, memory card, and Bluetooth module are all connected to the chip, the Bluetooth module is connected to the PC, and the chip is connected to the external software system to store and transmit information through the software system.

5. The improved intelligent normal pressure long-time coal seam gas content measuring device according to claim 4 is characterized in that: The parameter input and display module includes a touch screen with input function, the touch screen is connected to the chip, the touch screen is embedded on the top outer wall of the tank cover, the touch screen is also connected to a touch switch, the touch switch is embedded on the top outer wall of the tank cover and is located on the lower side of the touch screen; the air intake vertical pipe and the exhaust horizontal pipe are filled with cotton yarn columns; The small-capacity intrinsically safe battery includes a parallel explosion-proof battery pack for powering each module. A receiving-end charging coil corresponding to the transmitting-end charging coil is arranged inside the explosion-proof battery pack.

6. An intelligent method for measuring gas content in coal seams under normal pressure for a long time is implemented by using the improved intelligent device for measuring gas content in coal seams under normal pressure for a long time as claimed in claim 5, characterized in that: The steps include: (1) Test an improved intelligent normal pressure long-term coal seam gas content measuring device to ensure the normal operation of the device; (2) At least two sampling points are selected at the same measurement location, and drilling holes are constructed to sample the gas content in the coal seam; (3) Turn on the touch screen through the touch switch, and input the information of sampling location, sampling personnel, sampling date, and coal sample exposure time through the touch screen; (4) After drilling to the designed depth, collect coal samples at the hole mouth. After filling the tank body with the collected coal samples, wipe the coal dust on the tank mouth and the inner wide rubber pad of the tank cover. After wiping, install the tank cover on the tank body through the internal and external threads to ensure the sealing of the tank body; (5) The gas flow measurement module is turned on by the software system, and the software system records the gas desorption amount of the coal sample and the corresponding desorption time, ambient temperature, and atmospheric pressure; (6) After steps (1) to (5) are completed, the box cover is opened, the coal sample measuring tank is placed in the corresponding positioning hole and positioning groove in the placing box, the charging switch is turned on, and the box cover is closed. The transmitting end charging coil in the box cover corresponds to the receiving end charging coil in the tank cover, and the large-capacity intrinsically safe battery charges the small-capacity intrinsically safe battery through wireless charging; (7) The placement box containing the coal sample test tank is sent to the laboratory. During the transportation of the placement box, wireless charging is carried out continuously to ensure the subsequent residual gas content determination and the continuous completion of the gas desorption determination; (8) Turn on the Bluetooth module through the touch screen, connect to the PC in the laboratory, upload the desorption parameters to the PC, and calculate the measured coal seam gas content by combining the degassing volume, coal sample weight, industrial analysis of coal and gas sample components measured in the laboratory.

7. The intelligent method for determining the gas content in coal seams under normal pressure and for a long time according to claim 6 is characterized in that: The specific operation process of step (1) is: check whether the tank body and the tank cover are damaged, check whether the wide rubber pad of the tank cover is broken, check whether the cotton yarn column in the intake vertical pipe and the exhaust horizontal pipe is intact, and check whether the software system can operate normally; The specific implementation process of step (2) is as follows: the distance between two sampling points is ≥5m; when sampling is carried out by borehole sampling, the sampling depth is ≥12m; when sampling is carried out by borehole sampling, the depth of the coal hole section is ≥5m.

8. The intelligent method for determining the gas content in coal seams under normal pressure and for a long time according to claim 7 is characterized in that: The coal sample collected in step (4) is a dry coal sample free of gangue; In step (5), the chip automatically selects the flow meter and records the time of natural gas desorption of the coal sample, the amount of gas desorption, the ambient temperature and the atmospheric pressure.

9. The intelligent method for determining the gas content in coal seams under normal pressure and for a long time according to claim 8 is characterized in that: In step (6), the placement box is a rectangular hollow shell structure of 380mm×250mm×280mm, and six positioning grooves are provided on the bottom plate of the placement box to place six coal sample measurement tanks; an air pressure balance groove connected to the outside is provided on the upper edge of the side plate of the placement box to ensure that the inside of the placement box remains connected to the outside, so that the coal sample measurement tank is in a normal pressure state, and the gas desorbed from the coal sample is discharged out of the placement box in time.

10. The intelligent method for determining the gas content in coal seams under normal pressure and for a long time according to claim 9, characterized in that: In step (7), when it is necessary to carry out subsequent residual gas content determination, the coal sample needs to be degassed, weighed and the gas sample components analyzed.

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