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

Abstract

The invention discloses an 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 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; wherein the gas flow measuring module comprises a first electromagnetic flowmeter, a second electromagnetic flowmeter and a third electromagnetic flowmeter which are connected in parallel, and the measuring range of the first electromagnetic flowmeter is larger than the measuring range of the second electromagnetic flowmeter and smaller than the measuring range of the third electromagnetic flowmeter. 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 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 intelligent normal pressure long-time coal seam gas content measuring device and method. Background Art

[0002] As the depth of coal mining in my country increases, mine gas disasters become more serious. Studies have shown that the gas content of coal seams increases with the depth of mining. The size of coal seam gas content directly determines the size of coal seam gas pressure and the severity of mine gas disasters. In order to effectively control mine gas disasters, accurate measurement of coal seam gas content is essential. In addition, large-scale coalbed methane (gas) mining must also first determine the size of coal seam gas content. The accuracy of gas content measurement is directly related to the success or failure of resource development.

[0003] In the process of measuring the gas content of coal seams on-site in coal mines, whether it is the traditional drainage gas collection method or the rapid measurement method, it is necessary to carry bulky coal sample 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. Therefore, there is a need for an intelligent normal pressure long-term coal seam gas content measurement device and method with accurate measurement, low work intensity, time-saving and labor-saving, and high safety. Summary of the invention

[0004] The purpose of the present invention is to provide an intelligent normal pressure long-time coal seam gas content determination device and method with accurate measurement, low work intensity, time and labor saving and high safety.

[0005] To achieve the above object, the present invention adopts the following technical solutions: An intelligent normal-pressure long-time coal seam gas content measuring device 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 an 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 intrinsically safe battery are all installed in the installation cavity, and the parameter input and display module is arranged on the top outer wall 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.

[0006] 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.

[0007] 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, 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, among which the Bluetooth module can be connected to a PC, and the chip is connected (in addition to mechanical connection, the connection also includes electrical connection and signal connection. The electrical connection is connected through wires or data cables, and the signal connection is wireless connection) to an external software system, and information is stored and transmitted through the software system.

[0008] 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, and the touch screen is also connected to a touch switch, which is embedded on the top outer wall of the tank cover and located on the lower side of the touch screen.

[0009] The intake vertical pipe and exhaust cross pipe are filled with cotton yarn columns; The intrinsically safe battery includes an explosion-proof battery pack connected in parallel, which is used to power each module. A wireless charging coil is arranged inside the explosion-proof battery pack to realize the wireless charging function.

[0010] The intelligent normal pressure long-time coal seam gas content determination method is implemented based on the above-mentioned intelligent normal pressure long-time coal seam gas content determination device, and comprises the following steps: (1) Detect the 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 completing steps (1) to (5), place the device in a matching storage box; (7) Send the box containing the measuring device to the laboratory and perform wireless charging to ensure that the device has sufficient power before the subsequent residual gas content measurement to ensure that the device can continuously complete the gas desorption measurement; (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.

[0011] 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.

[0012] 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.

[0013] In step (6), a groove communicating with the outside world is provided on the storage box body to ensure that the device is connected with the outside world, so that the device is in a normal pressure state, and the gas desorbed by the coal sample is discharged out of the storage box in time; The storage box is provided with a slot for mounting the tank body, and cotton cloth is placed on the slot as an inner lining. The outer shell of the storage box is made of flame-retardant and antistatic PA plastic material, and the circumference of the device in the storage box is filled with built-in objects, which are lightweight flame-retardant and antistatic polyurethane.

[0014] 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.

[0015] This device 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, nor is there a need for matching wrenches, stopwatches, thermometers, barometers, recording paper and pens, etc., which greatly reduces the labor intensity of workers.

[0016] Since the device 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.

[0017] 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.

[0018] 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.

[0019] The device and method are 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 device automatically calculates the amount of gas loss in the sampling process based on the instantaneous gas diffusion coefficient, which effectively reduces the method error from the theoretical basis level, the calculation process is more intelligent, and the calculation results are more accurate, further improving the accuracy of gas content measurement.

[0020] 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.

[0021] To sum up, the measuring device of the present application is easy to operate, avoids cumbersome operating steps, greatly reduces work intensity, and improves the degree of automation of coal seam gas content through corresponding measurement processes and calculation methods, effectively solving the technical problems of existing measurement devices and methods, such as large gas content errors, high work intensity, time-consuming and labor-intensive, serious gas leakage in the device, and certain safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the measuring device of the present invention.

[0023] Figure 2 It is a structural schematic diagram of the tank body of the present invention.

[0024] Figure 3 It is a structural schematic diagram of the can cover of the present invention from a first viewing angle.

[0025] Figure 4 It is a structural schematic diagram of the can cover of the present invention from a second viewing angle.

[0026] Figure 5 It is a structural schematic diagram of the pipeline assembly of the present invention.

[0027] Figure 6 It is a schematic diagram of the structure of the pipeline assembly and the intrinsically safe battery of the present invention.

[0028] Figure 7 It is a schematic diagram of the structure of the measuring device of the present invention placed in a placement box. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0030] Embodiment 1 like Figure 1-7 As shown, the intelligent normal pressure long-time coal seam gas content measuring device 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 an intrinsically safe battery 22; the top inner wall of the tank body 1 is provided with an external thread 5, the bottom inner wall of the tank cover 2 is provided with an internal thread 6 engaged with the external thread 5, and the tank cover 2 is detachably connected to the tank body 1 through the engagement 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 top inner wall 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 intrinsically safe battery 22 are all installed in the installation cavity, and the parameter input and display module is arranged on the top outer wall 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.

[0031] 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.

[0032] 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 to an external software system, and information is stored and transmitted through the software system.

[0033] 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.

[0034] 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.

[0035] The intrinsically safe battery 22 includes a parallel explosion-proof battery pack for powering each module. A wireless charging coil is provided inside the explosion-proof battery pack to realize the wireless charging function, ensuring that the system can run for a long time before the residual gas content is measured in the ground laboratory. Under normal circumstances, the power supply time is not less than 18 hours. The device automatically measures parameters such as gas flow, desorption time, ambient temperature, and atmospheric pressure. It is no longer necessary for the measuring personnel to carry a bulky desorption instrument, nor is it necessary to carry matching wrenches, stopwatches, thermometers, barometers, recording paper and pens, etc., which greatly reduces the labor intensity of workers.

[0036] Since the measuring device 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 measuring device 21 very tightly, which saves time and effort, greatly reduces the occurrence of gas leakage in the measuring device 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 measuring device 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 as the theoretical basis, and the loss amount is calculated by a fixed diffusion coefficient, which is inconsistent with the actual gas desorption process of the coal sample, 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 measuring device 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.

[0037] Embodiment 2 The intelligent normal pressure long-time coal seam gas content determination method is implemented based on the above-mentioned intelligent normal pressure long-time coal seam gas content determination device, and comprises the following steps: (1) Detect the 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.

[0038] (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 device is placed in a matching storage box 4; (7) Send the placement box 4 containing the device to the laboratory. Each placement box 4 can be used to place 6 to 8 measuring devices 21, and wireless charging is performed to ensure that the device has sufficient power before the subsequent residual gas content measurement, so as to ensure that the device can continuously complete the gas desorption measurement; (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.

[0039] 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.

[0040] 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.

[0041] In step (6), a groove communicating with the outside is provided on the body of the placement box 4 to ensure that the device is connected with the outside, so that the device is in a normal pressure state, and the gas desorbed by the coal sample is discharged from the placement box 4 in time; A card slot for clamping the tank body 1 is provided in the placement box 4, and cotton cloth is placed on the card slot as an inner lining. The outer shell material of the placement box 4 is flame-retardant and antistatic PA plastic material. The circumference of the device in the placement box 4 is filled with built-in objects, which are lightweight flame-retardant and antistatic polyurethane.

[0042] 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.

[0043] 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. Intelligent atmospheric pressure long-time coal seam gas content measuring device, characterized by: It includes a tank body, a tank cover, a gas flow measurement module, an environmental parameter measurement module, a parameter input and display module, a data storage and calculation module, a data transmission module, and an 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 intrinsically safe battery are all installed in the installation cavity, and the parameter input and display module is arranged on the top outer wall 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. The intelligent atmospheric pressure long-time coal seam gas content measuring device according to claim 1 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 (when the tank body is 120-140 and the tank cover is 40-60, the overall height should be 160-200), 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 intelligent normal pressure long-time coal seam gas content measuring device according to claim 2 is characterized in that: 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, 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, among which the Bluetooth module can be connected to a PC, and the chip is connected (in addition to mechanical connection, the connection also includes electrical connection and signal connection. The electrical connection is connected through wires or data cables, and the signal connection is wireless connection) to an external software system, and information is stored and transmitted through the software system.

4. The intelligent normal pressure long-time coal seam gas content measuring device according to claim 3 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, and the touch screen is also connected to a touch switch, which is embedded on the top outer wall of the tank cover and located on the lower side of the touch screen.

5. The intelligent normal pressure long-time coal seam gas content measuring device according to claim 4 is characterized in that: The intake vertical pipe and exhaust cross pipe are filled with cotton yarn columns; The intrinsically safe battery includes an explosion-proof battery pack connected in parallel, which is used to power each module. A wireless charging coil is arranged inside the explosion-proof battery pack to realize the wireless charging function.

6. An intelligent method for measuring gas content in coal seams under normal pressure for a long time, which is implemented based on the intelligent device for measuring gas content in coal seams under normal pressure for a long time as claimed in any one of claims 1 to 5, characterized in that: The steps include: (1) Detect the 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 completing steps (1) to (5), place the device in a matching storage box; (7) Send the box containing the measuring device to the laboratory and perform wireless charging to ensure that the device has sufficient power before the subsequent residual gas content measurement to ensure that the device can continuously complete the gas desorption measurement; (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), a groove communicating with the outside world is provided on the storage box body to ensure that the device is connected with the outside world, so that the device is in a normal pressure state, and the gas desorbed by the coal sample is discharged out of the storage box in time; The storage box is provided with a slot for mounting the tank body, and cotton cloth is placed on the slot as an inner lining. The outer shell of the storage box is made of flame-retardant and antistatic PA plastic material, and the circumference of the device in the storage box is filled with built-in objects, which are lightweight flame-retardant and antistatic polyurethane.

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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