Pressure-maintaining and gas-maintaining coring sample closed transfer and integrated crushing system

Abstract

The present invention is applicable to the technical field of gas content and coalbed methane content determination, and provides a pressure-maintaining gas coring sample closed transfer and integrated crushing system. The system includes a pressure-maintaining gas coring process sample closed transfer device that can be connected to a closed coring device, an integrated closed crushing device that can be connected to the pressure-maintaining gas coring process sample closed transfer device and is used to crush the coal core sample, and a closed pushing device that is used to push the coal core sample from the pressure-maintaining gas coring process sample closed transfer device into the integrated closed crushing device or the sample transfer device. The pressure-maintaining gas coring sample closed transfer and integrated crushing system provided by the present invention overcomes the problem that gas cannot be retained and measured accurately in traditional coal seam sampling, and can greatly shorten the test time, with good application effect.

Description

Technical Field

[0001] The invention belongs to the technical field of gas content and coalbed methane content determination, and in particular relates to a pressure-maintaining and gas-maintaining coring sample closed transfer and integrated crushing system and method. Background Art

[0002] my country is rich in coal resources. Coalbed methane or coalbed gas is widely distributed in coal seams as a by-product of coal. Coalbed methane or gas is a high-quality clean energy, but also a dangerous substance or source of danger that restricts coal mine safety production. Accurate determination of coalbed gas content or coalbed methane content is an important basis for gas control and coalbed methane utilization.

[0003] There are two methods for determining the gas content or gas content of coalbed methane: direct method and indirect method. The indirect method requires the determination of the relevant basic physical and mechanical parameters of the coal seam. The fidelity coring (pressure-maintaining and gas-maintaining) technology is used to obtain gas-containing coal core samples, and integrated determination of closed transfer and crushing can obtain more accurate coalbed methane gas content or gas content and other coalbed gas parameters. Send the pressure-maintaining and gas-maintaining coring device into the coring position in the coal seam borehole, continue drilling to obtain the core, close the coring device valve cover, and then withdraw the coring device from the borehole, and carry out closed transfer and crushing underground or on the ground to achieve integrated coalbed methane gas content or gas content determination.

[0004] However, the existing technology for measuring gas content or coalbed methane content obtains coal seam debris samples by using conventional sampling drills (such as twist drills) to collect coal seam debris samples while drilling and exhausting. The coal dust loaded into the coal sample tank is first desorbed underground, and then moved to the ground for secondary desorption and crushing desorption. During this period, the volume of desorbed gas and residual gas is measured by water drainage gas collection equipment; the volume of lost gas is then estimated by empirical formulas, and the coalbed methane content or gas content is calculated. In the prior art, the sample is usually taken out directly from the coal sample tank and placed in a water drainage gas collection device for crushing and measuring the volume of gas. In this process, the direct exposure of the sample to the external environment during transfer will inevitably lead to gas loss, making it impossible to accurately measure the gas content of the coal seam. Although the conventional sampling process has a high penetration rate and mature technology, the samples are exposed to the wind flow during the whole process of coal sampling by wind exhaust drilling, which causes some desorbed gas to escape during drilling and sampling; and part of the measured volume is estimated by empirical formula, which affects the accuracy of the final result; at the same time, the sample desorption process lasts for dozens of hours to several days, and the whole process test time is relatively long (refer to GB / T23250 Direct Downhole Determination Method of Coal Seam Gas Content and GB / T19559 Coal Seam Gas Content Determination Method). In some improved closed coring technologies, although the sampling process reduces the exposure time of coal samples, the sample transfer process is still not closed, and it is impossible to achieve full closed transfer, and the accuracy of coal seam gas content determination is not high. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a system and method for closed transfer and integrated crushing of pressure-maintaining and gas-maintaining coring samples, which can improve the accuracy of the determination of coal seam gas content or coal seam methane content.

[0006] The technical solution of the present invention is: a closed transfer and integrated crushing system for pressure-maintaining gas coring samples, including a closed transfer device for samples under the pressure-maintaining gas coring process that can be used to be connected to a closed coring device, an integrated closed crushing device that can be connected to the closed transfer device for samples under the pressure-maintaining gas coring process and is used to crush coal core samples, and a closed pushing device for pushing coal core samples from the closed transfer device for samples under the pressure-maintaining gas coring process into the integrated closed crushing device or sample transfer device.

[0007] Specifically, the closed sample transfer device under the pressure-maintaining gas coring process includes a transfer cabin, one end of which is provided with a first connecting component for docking with the closed core sampler and the closed pushing device, and the other end of the transfer cabin is provided with a second connecting component for docking with the integrated closed crushing device.

[0008] Specifically, the first connecting component has a first valve group; the second connecting component has a second valve group.

[0009] Specifically, the closed corer includes a corer outer barrel, a core tube disposed in the corer outer barrel and used to fit the coal core sample, a center rod connected to one end of the core tube, and a pull rod connected to the center rod and extending out of the rotary chamber.

[0010] Specifically, the transfer cabin is provided with a first locking component for locking the core barrel;

[0011] The second connecting component is connected to a detachable rotating cabin into which the central rod can be inserted, and the rotating cabin is provided with a second locking component for locking the central rod;

[0012] The gyratory chamber is provided with a gyroscope and its components for driving the central rod to rotate so as to separate the central rod from the core tube;

[0013] The transfer cabin is connected to a volume compensation cylinder for overcoming the balance between the internal air pressure of the system and the atmospheric pressure during the process of pulling the central rod;

[0014] The outer wall of the transfer cabin is provided with a pipeline connected to collect desorbed gas and a stop valve group;

[0015] The outer wall of the transfer cabin is also provided with an anti-collision safety mechanism to prevent accidents caused by reverse thrust when the closed core drill with internal pressure is opened.

[0016] Specifically, the integrated enclosed crushing device comprises an enclosed crushing cabin, one end of which can be connected to the second connecting component and a crushing component arranged in the enclosed crushing cabin, and the other end of the enclosed crushing cabin is provided with a crushing cabin door.

[0017] Specifically, a primary crushing chamber and a secondary crushing chamber are arranged in the enclosed crushing chamber, and a screen is provided between the primary crushing chamber and the secondary crushing chamber.

[0018] Specifically, a rotary grinding cutter disc is arranged in the enclosed crushing chamber, and the rotary grinding cutter disc is connected with a cutter disc tail column; the enclosed crushing chamber is also provided with a double-layer ball mill component; the double-layer ball mill component comprises a rotatable primary crushing drum and a secondary crushing drum rotating in the opposite direction to the primary crushing drum, the primary crushing drum is sleeved outside the secondary crushing drum; the secondary crushing drum has a mesh structure;

[0019] Alternatively, a rotary opener is provided in the enclosed crushing chamber, a driving component for driving the rotary opener to reciprocate and rotate along the axial direction of the enclosed crushing chamber is connected to the rear end of the rotary opener, and the rotary opener is provided with an array hole, and the front end diameter of the array hole is smaller than the rear end diameter;

[0020] The outer wall of the crushing chamber is provided with a pipeline connected to collect desorbed gas and a stop valve group.

[0021] Specifically, the closed pushing device includes a closed pushing cylinder that can be docked with the first connecting component and a driving component connected to the closed pushing cylinder, and the driving component is connected to a pushing rod for pushing the coal core sample in the closed sample transfer device under the pressure-maintaining and gas-maintaining coring process to the integrated closed crushing device.

[0022] The present invention also provides a method for closed transfer and integrated crushing of pressure-maintained gas coring samples, which uses the above-mentioned closed transfer and integrated crushing system for pressure-maintained gas coring samples, and includes the following steps:

[0023] After the closed corer obtains the coal core sample, the airtightness test is first performed on the closed corer, and a pull rod is externally connected to open the valve group at the first end, and the unlocking sleeve of the closed corer is installed. The first locking component clamps the unlocking sleeve, connects the gyroscope cabin and the gyroscope and its components, and installs the anti-collision safety mechanism. Then, the corer together with the pull rod is docked to the first end of the sample closed transfer device under the pressure-maintaining and gas-maintaining coring process, and the pull rod is extended out of the gyroscope cabin to ensure dynamic sealing;

[0024] Close the transfer cabin desorption valve, move the closed corer and the valve group at the first end toward the fastening claw to unlock the limit switch inside the corer, move the pull rod toward the whirlpool cabin to pull out the center rod and the core barrel, transfer the coal core sample in the closed corer from the first end to the sample closed transfer device under the pressure-maintaining gas coring process, lock the center rod with the second locking component, and the whirlpool and its components loosen the connection between the core barrel and the center rod. The pull rod pulls the center rod into the whirlpool cabin through the valve group at the second end, open the transfer cabin desorption valve, and measure the volume of desorbed gas from the coal sample during the transfer process by the water drainage and gas collection method;

[0025] After the desorption rate stabilizes, the valve groups at the first and second ends of the transfer chamber are closed, and the closed corer at the first end and the cyclotron chamber at the second end of the sample closed transfer device under the pressure-maintaining and gas-maintaining coring process are removed;

[0026] Open the desorption valve of the transfer chamber of the sample sealed transfer device, and measure the desorption gas volume of the coal sample during the transfer process by the water discharge and gas collection method;

[0027] The first end of the sample closed transfer device is connected to the closed push device in the pressure-maintaining gas coring process;

[0028] The second end of the sample closed transfer device under the pressure-maintaining gas coring process is connected to the integrated closed crushing device or the sample transfer device;

[0029] Open the valve group at the first end and the valve group at the second end;

[0030] The coal core sample in the sample closed transfer device under the pressure-maintaining gas coring process is pushed to the integrated closed crushing device or the sample transfer device through the closed pushing device; the valve group at the second end and the desorption valve of the transfer cabin are closed;

[0031] The integrated closed crushing device dries and crushes the coal core sample, opens the crushing cabin desorption valve of the integrated closed crushing device, and measures the desorbed gas volume of the coal sample during the drying and crushing process by the water discharge gas collection method; desorption is completed when no bubbles are generated in the gas collection cylinder within 5 minutes (refer to GB23250), closes the test instrument desorption valve group and pipeline valve group, and records the reading of the gas collection cylinder, ambient temperature, and atmospheric pressure;

[0032] Collect and weigh powder samples that meet the target particle size for later data processing.

[0033] The present invention provides a closed transfer and integrated crushing system and method for pressure-maintaining and gas-maintaining coring samples, which supports gas disaster management and resource assessment in coalbed methane development. The gas / coalbed methane content of coal core samples obtained by the "pressure-maintaining and gas-maintaining" coring process can be quickly determined through an in-situ transfer chamber and a crushing chamber, thereby providing a scientific determination method and advanced technical equipment for efficient utilization of coalbed methane and safe production in underground coal mines, overcoming the difficulties of gas preservation and inaccurate measurement in traditional coal seam sampling, and greatly shortening the test time, with good application effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 It is a plan view of a closed coring device in a pressure-maintaining and gas-maintaining coring sample closed transfer and integrated crushing system provided by an embodiment of the present invention;

[0036] Figure 2 It is a plan schematic diagram of a sample sealed transfer device under a pressure-maintaining gas coring process in a pressure-maintaining gas coring sample sealed transfer and integrated crushing system provided by an embodiment of the present invention;

[0037] Figure 3 It is a plan view schematic diagram of an integrated closed crushing device in a pressure-maintaining and gas-maintaining coring sample closed transfer and integrated crushing system provided by an embodiment of the present invention;

[0038] Figure 4 It is a plan view schematic diagram of a closed pushing device in a pressure-maintaining and gas-maintaining coring sample closed transfer and integrated crushing system provided by an embodiment of the present invention;

[0039] Figure 5 It is a transverse cross-sectional schematic diagram of a first integrated closed crushing device in a pressure-maintaining and gas-maintaining coring sample closed transfer and integrated crushing system provided by an embodiment of the present invention;

[0040] Figure 6 It is a longitudinal cross-sectional schematic diagram of a first integrated closed crushing device in a pressure-maintaining and gas-maintaining coring sample closed transfer and integrated crushing system provided by an embodiment of the present invention;

[0041] Figure 7 It is a schematic diagram of the principle of a second integrated closed crushing device in a pressure-maintaining and gas-maintaining coring sample closed transfer and integrated crushing system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0044] In addition, in the embodiments of the present invention, if there are terms indicating orientation or positional relationships such as "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., they are based on the orientation or positional relationships or conventional placement states or usage states shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure, feature, device or element referred to must have a specific orientation or positional relationship, nor must it be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0045] The various specific technical features and embodiments described in the specific implementation methods can be combined in any suitable manner unless there is any contradiction. For example, different implementation methods can be formed by combining different specific technical features / embodiments. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features / embodiments in the present invention will not be described separately.

[0046] like Figures 1 to 4As shown, a closed transfer and integrated crushing system for pressure-maintaining gas coring samples provided by an embodiment of the present invention includes a closed transfer device for samples under pressure-maintaining gas coring technology (referred to as: closed transfer device) 2, a closed coring device, an integrated closed crushing device 3 that can be sealedly connected to the closed transfer device 2 for samples under pressure-maintaining gas coring technology and is used to crush coal core samples, and a closed pushing device 4 that can be sealedly connected to the closed transfer device 2 for samples under pressure-maintaining gas coring technology and is used to push coal core samples from the closed transfer device 2 for samples under pressure-maintaining gas coring technology into the integrated closed crushing device 3 or the sample transfer device. The closed transfer device 2 for samples under pressure-maintaining gas coring technology can be used to connect with the closed coring device 1. The closed pushing device 4, the closed coring device 1, and the integrated closed crushing device 3 can be detachably connected to the closed sample transfer device 2 under the pressure-maintaining and gas-maintaining coring process through a controllable closed valve group, so as to realize the transfer and crushing of coal core samples in a closed environment, avoid the loss of gas in the coal core samples from escaping, ensure the accurate determination of the gas content in the coal seam, and have a high accuracy rate in the determination of the gas content in the coal seam.

[0047] Specifically, the sample closed transfer device 2 under the pressure-maintaining gas coring process includes a transfer cabin 26 (front cabin), one end of the transfer cabin 26 is provided with a first connecting component 21 (i.e., a first valve group) for sealingly docking with the closed core sampler 1 and the closed pushing device 4, and the other end of the transfer cabin 26 is provided with a second connecting component 23 (i.e., a second valve group) for sealingly docking with the integrated closed crushing device 3. The transfer cabin 26 can be cylindrical, and its two ends are respectively provided with a first connecting component 21 and a second connecting component 23. The closed core sampler 1 and the closed pushing device 4 can be successively sealed and connected to the first connecting component 21 of the sample closed transfer device 2 under the pressure-maintaining gas coring process, and the integrated closed crushing device 3 can be sealed and connected to the second connecting component 23.

[0048] Specifically, the first connecting component 21 has a first valve group; the second connecting component 23 has a second valve group, the first valve group and the second valve group can be control valves such as ball valves, and the first connecting component 21 and the second connecting component 23 can be provided with plug interfaces to facilitate sealed docking with the closed corer 1 and the closed pushing device 4 and the integrated closed crushing device 3.

[0049] Specifically, the closed coring device 1 includes a corer outer barrel 13, a core tube 12 disposed in the corer outer barrel 13 and used to fit the coal core sample 11, a center rod 14 that can be threadedly connected to one end of the core tube 12, and a pull rod 15 that is connected to the center rod 14 and extends out of the corer outer barrel 13 (swivel chamber). The center rod 14 is rotatably threadedly connected to the core tube 12 to form a corer. When the corer outer barrel 13 is connected to the first connecting component 21 of the sample closed transfer device 2 under the pressure-maintaining gas coring process, the pull rod 15 can be extended from the second connecting component 23, and the pull rod 15 can be pulled to pull the core tube 12 and the coal core sample 11 therein to the transfer chamber 26.

[0050] Specifically, the transfer cabin 26 is provided with a first locking component for locking the core barrel 12 ; the first locking component may be a first fastening claw 22 .

[0051] In specific applications, the transfer cabin 26 may be connected to a volume compensation cylinder to overcome the balance between the internal air pressure of the system and the atmospheric pressure during the process of pulling the center rod 14. The outer wall of the transfer cabin 26 may be provided with a pipeline and a stop valve group (transfer cabin desorption valve) for collecting desorbed gas. The outer wall of the transfer cabin 26 may also be provided with an anti-collision safety mechanism to prevent accidents caused by the reverse thrust of the corer with internal pressure.

[0052] Specifically, the second connecting component 23 is connected with a swirling cabin 27 which is removable and into which the center rod 14 can be inserted, and the swirling cabin 27 is provided with a second locking component for locking the center rod 14; the second locking component can be a second fastening claw 24. The swirling cabin 27 is provided with a gyrator 25 for driving the center rod 14 to rotate so that the center rod 14 is separated from the core tube 12, that is, the center rod 14 is rotated by the gyrator 25, and the corer formed by the center rod 14 being threadedly connected to the core tube 12 can be unlocked. After unlocking, the center rod 14 and the like can be left in the swirling cabin 27, the coal core sample 11 is located in the transfer cabin 26 (front cabin), and the swirling cabin 27 can be removed as a whole. This is to facilitate the connection of the integrated closed crushing device 3 on the second connecting component 23. At this time, the closed corer 1 can also be removed from the first connecting component 21 , and the closed pushing device 4 can be installed on the first connecting component 21 to push the coal core sample 11 in the transfer chamber 26 (front chamber) to the integrated closed crushing device 3 .

[0053] Specifically, the integrated enclosed crushing device 3 includes an enclosed crushing cabin 30 which can be connected to the second connecting component 23 at one end and a crushing component arranged in the enclosed crushing cabin 30. The other end of the enclosed crushing cabin 30 is provided with a crushing cabin door 36, which can be opened.

[0054] In a specific application, the outer wall of the closed crushing chamber 30 may be provided with a pipeline connected to collect desorbed gas and a stop valve group (crushing chamber desorption valve).

[0055] Specifically, Figures 1 to 6 As shown, the enclosed crushing chamber 30 is provided with a primary crushing chamber 31 and a secondary crushing chamber 34, and a screen 33 is provided between the primary crushing chamber 31 and the secondary crushing chamber 34. In specific applications, a single-stage or multi-stage crushing method can also be adopted. A rotary opener 32 can be provided in the primary crushing chamber 31, and a grinding ball 35 can be provided in the secondary crushing chamber 34.

[0056] Alternatively, a rotary grinding cutter disc may be provided in the enclosed crushing chamber 30 (primary crushing chamber 31), and the rotary grinding cutter disc is connected to a cutter disc tail column; the enclosed crushing chamber 30 (secondary crushing chamber 34) is also provided with a double-layer ball mill component; the double-layer ball mill component includes a rotatable primary crushing drum 371 and a secondary crushing drum 372 which rotates in the opposite direction to the primary crushing drum 371, and the primary crushing drum 371 is sleeved on the outside of the secondary crushing drum 372; the secondary crushing drum 372 has a mesh structure.

[0057] Or, if Figure 7 As shown, a rotary opener and closer 394 is provided in the enclosed crushing chamber 30, and a driving component 393 is connected to the rear end of the rotary opener and closer 394 for driving the rotary opener and closer 394 to reciprocate axially along the enclosed crushing chamber 30. The rotary opener and closer 394 is provided with an array hole, and the front end diameter of the array hole is smaller than the rear end diameter.

[0058] Specifically, the closed pushing device 4 includes a closed pushing cylinder that can be docked with the first connecting component 21 and a driving component 41 connected to the closed pushing cylinder, and the driving component 41 is connected to a pushing rod 42 for pushing the coal core sample 11 in the sample closed transfer device 2 under the pressure-maintaining gas coring process to the integrated closed crushing device 3. The driving component 41 can be a cylinder.

[0059] In specific applications, the closed crushing chamber 30 can be cylindrical, with an inner diameter close to the sample diameter, and the axial direction is loaded with strong force. The front end can be equipped with a rotating mechanism based on the principle of a small shield. First, the tail column of the cutter head is squeezed to crush the long rock core into coal particles with smaller particle size, and the primary crushing is carried out by squeezing and rotating at the same time. Then the high-speed rotating double-layer ball mill system is used to implement graded crushing. Specifically, a double-layer ball mill crushing chamber can be used, and the rotation direction of the second-layer crushing drum 372 inside is opposite to the rotation direction of the first-layer crushing drum 371 outside; the second-layer crushing drum 372 is designed with a mesh structure to realize automatic centrifugal classification of coal powder and coal particles 38; the second-layer crushing drum 372 is equipped with spheres with larger particles, and the space between the second-layer crushing drum 372 and the first-layer crushing drum 371 is equipped with spheres with smaller particles. Finally, the powder is collected at the end of the closed crushing chamber 30 (the door end of the crushing chamber is facing down) by placing the whole vertically, and the coal powder is quickly opened and closed to be weighed. The crushing method can also be achieved by reciprocating impact of the rotary opener 394. The center of the rotary opener and closeer 394 has an array of holes to allow the coal particles crushed at the front end to pass through. The front diameter of the hole is smaller than the rear diameter to prevent the coal particles from getting stuck. The rotary opener and closeer 394 can adjust the opening and closing of the hole as needed; the rear end of the rotary opener and closeer 394 is provided with a tightening cylinder that can reciprocate along the axis of the crushing chamber. Through reciprocating impact, the coal core sample 11 is crushed. The coal powder crushed at the front end is timely filtered through the screen 33 at the front end of the cylinder to the secondary crushing chamber 34. The secondary crushing chamber 34 is connected to a coal powder collection device to weigh its mass. The rear end of the rotating mechanism (rotary grinding cutter disc) automatically produces fine coal samples and transfers them to the double-layer ball mill device for automatic centrifugal screening and grading, saving space as much as possible.

[0060] The present invention also provides a method for closed transfer and integrated crushing of pressure-maintained gas coring samples, which uses the above-mentioned closed transfer and integrated crushing system for pressure-maintained gas coring samples, and includes the following steps:

[0061] After the closed corer 1 obtains the coal core sample 11, the air tightness test is first performed on the closed corer 1, and the pull rod 15 is externally connected, the valve group at the first end is opened, the unlocking sleeve of the closed corer is installed, the first locking component clamps the unlocking sleeve, the gyratory chamber 27 is connected to the gyratory machine and its components, and the anti-collision safety mechanism is installed. Then, the corer together with the pull rod is docked to the first end of the sample closed transfer device 2 under the pressure-maintaining and gas-maintaining coring process, and the pull rod 15 is extended out of the gyratory chamber 27 to ensure dynamic sealing;

[0062] Close the transfer cabin desorption valve, move the closed corer and the valve group at the first end toward the fastening claw to unlock the limit switch inside the corer, move the pull rod 15 toward the whirlpool cabin 27 to pull out the center rod 14 and the core barrel of the closed corer 1, and transfer the coal core sample 11 in the closed corer 1 from the first end to the sample closed transfer device 2 under the pressure-maintaining gas coring process, the second locking component locks the center rod 14, the whirlpool and its components loosen the connection between the core barrel and the center rod, the pull rod pulls the center rod through the valve group at the second end into the whirlpool cabin 27, open the transfer cabin desorption valve, and measure the volume of desorbed gas from the coal sample during the transfer process by the water drainage and gas collection method;

[0063] After the desorption rate stabilizes, the valve groups at the first and second ends of the transfer chamber are closed, and the closed corer 1 at the first end and the cyclotron chamber at the second end of the sample closed transfer device 2 under the pressure-maintaining and gas-maintaining coring process are removed;

[0064] In the pressure-maintaining gas coring process, the first end of the sample closed transfer device 2 is connected to the closed push device 4;

[0065] In the pressure-maintaining and gas-maintaining coring process, the second end of the sample closed transfer device 2 is connected to the integrated closed crushing device 3 or the sample transfer device;

[0066] Open the valve group at the first end and the second valve group at the second end;

[0067] The coal core sample 11 in the sample sealed transfer device 2 under the pressure-maintaining gas coring process is pushed to the integrated sealed crushing device 3 by a sealed pushing device, and the valve group at the second end and the transfer cabin desorption valve are closed;

[0068] The integrated closed crushing device 3 dries and crushes the coal core sample 11, and the desorption valve of the crushing cabin of the integrated closed crushing device is opened.

[0069] The desorption gas volume of the coal sample during drying and crushing is measured by the drainage gas collection method; the desorption is completed when no bubbles are generated in the gas collection cylinder within 5 minutes (refer to GB23250), the desorption valve group and pipeline valve group of the test instrument are closed, and the reading of the gas collection cylinder, ambient temperature and atmospheric pressure are recorded;

[0070] Collect and weigh powder samples that meet the target particle size, and perform post-data processing to subsequently determine the gas content.

[0071] In specific applications, the drying process will affect the final metering volume of the gas due to the increase in temperature and expansion of the gas volume. Therefore, a gas washing device for cooling and removing impurities should be set up when draining water and collecting gas.

[0072] In specific applications, the second end used to connect to the integrated closed crushing device 3 can also be connected to a sample converter for sample storage, processing or testing.

[0073] Specifically, the pressure-maintaining, gas-maintaining, closed transfer and integrated crushing system realizes the functions of sealed docking of the corer, unlocking in the transfer cabin 26, dragging the center rod 14, and core separation, ensuring the transfer of the coal core in a closed environment; at the same time, it can be moved from the transfer cabin 26 to the closed crushing cabin 30 for efficient crushing, and can collect the gas generated in the process to realize the in-situ transfer and crushing of the coal sample. The whole set of system equipment must have a certain pressure bearing capacity and temperature control function and have long-term stability to ensure the sealed transfer of the gas content and pressure of the in-situ coal core in the corer. The overall internal volume of the system is designed to be as small as possible to reduce the error in the gas content measurement caused by the large closed volume.

[0074] The pressure-maintaining and gas-maintaining coring sample closed transfer and integrated crushing system is capable of unlocking the coring device under closed conditions, separating the core (coal core sample 11) from the core tube 12, and realizing the closed transfer of the coal core, including unlocking the limit switch of the coring device, removing the center rod 14, twisting and separating the core tube 12, and transferring the core, etc.

[0075] The closed transfer and integrated crushing system for pressure-maintaining and gas-maintaining coring samples has two-stage integrated crushing and temperature control of coal cores, ensuring that the coal cores with a diameter of 50mm and a length of 350mm are crushed to a particle size of less than 60 mesh after primary and secondary crushing, and can achieve a maximum temperature control of 105°C in the crushing chamber, including drying, weighing, preliminary crushing of coal cores, secondary crushing and screening.

[0076] The closed transfer and integrated crushing system for pressure-maintaining and gas-retaining coring samples has the functions of gas separation and collection, which can realize gas collection during the transfer and crushing process and match and connect with the desorption gas content determination unit; the determination unit can be connected to the closed transfer and integrated crushing system for pressure-maintaining and gas-retaining coring samples.

[0077] The pressure-maintaining and gas-maintaining coring sample closed transfer and integrated crushing system, each actuating mechanical structure is provided with a scale or label to simplify the actual operation.

[0078] In order to overcome the influence of factors such as the estimation error of lost gas content and sealing quality in the determination of gas content in coal under traditional coring technology and improve the accuracy of gas content determination, a pressure-maintaining and gas-maintaining coring sample closed transfer and integrated crushing system is provided, which has the functions of closed transfer and crushing of coal cores throughout the whole process.

[0079] In a specific application, after the pressure-maintaining gas coring device obtains the coal core sample 11, the outer tube 13 of the coring device is connected to the sample closed transfer device 2 under the pressure-maintaining gas coring process through the first valve group, and the core, the core tube 12, and the center rod 14 are pulled to the front transfer cabin by the pull rod 15, and the first valve group is closed; the core tube 12 and the center rod 14 are locked by the first fastening claw 22 and the second fastening claw 24, and the threads of the core tube 12 and the center rod 14 are unlocked by the gyrator 25, and the core tube 12 and the center rod 14 are separated and pulled to the gyrator. Cabin 27; close the second valve group and disassemble the swirl cabin 27, remove the swirl cabin 27 together with the center rod 14 and the pull rod 15; connect the closed pushing device 4 to the first valve group, connect the integrated closed crushing device 3 to the second valve group, open the first valve group and the second valve group, push the core to the integrated closed crushing device 3; in the first crushing cabin 31, use the rotary opener 394 to reciprocate and impact for primary crushing, and the coal sample that meets the particle size requirement passes through the screen 33 into the second crushing cabin 34, and uses grinding balls for secondary crushing.

[0080] The pressure-maintaining and gas-maintaining closed transfer and integrated crushing system has the function of directly unlocking the core sampler. Through a series of technical indicators and production quality control, it can scientifically and reliably realize the closed transfer and integrated crushing of the coal core under the pressure-maintaining and gas-maintaining coring process, overcoming the difficult problems of gas retention and inaccurate measurement in traditional coal seam sampling, greatly reducing the deviation between the 11 gas content of the coal core sample and the actual gas content in the in-situ coal seam, and improving the measurement accuracy of the coal seam gas content. By directly unlocking the core sampler and integrated crushing, the test time of the 11 gas content of the coal core sample is greatly shortened from several days to several hours.

[0081] The specific working process of the present invention to achieve closed transfer and integrated crushing of pressure-maintaining and gas-maintaining coring samples is as follows:

[0082] Step 1: Keep the first valve group and the second valve group in an open state, and install the corer outer tube 13 at the first valve group to seal the pressure-retaining and gas-retaining corer with the sealed transfer cabin 26;

[0083] Step 2: Drag the pull rod 15 to drag the core and the core tube 12 to the transfer front cabin (transfer cabin 26), at which time the center rod 14 is located in the swirl cabin 27, and close the first valve group;

[0084] Step 3: Use the first fastening claw 22 to lock the core tube 12, and the second fastening claw 24 to lock the center rod 14, and rotate the center rod 14 by the gyrator 25 to unlock the thread between the center rod 14 and the core tube 12, so as to separate the center rod 14 from the core tube 12;

[0085] Step 4: Close the second valve group, remove the swivel cabin 27 from the second valve group, and remove the swivel cabin 27, the center rod 14 and the pull rod 15;

[0086] Step 5: Install the enclosed crushing chamber 30 to the second valve group, install the enclosed push device 4 to the first valve group, open the first valve group and the second valve group, open the cylinder to push the core into the primary crushing chamber 31 by using the push rod 42, and close the first valve group and the second valve group;

[0087] Step 6: Use the rotary opener 394 to reciprocate and impact the core for primary crushing, or use the rotary grinding cutter disc for primary crushing. The coal sample that has been crushed to the required particle size passes through the screen 33 into the secondary crushing chamber 34, and then uses grinding balls for secondary grinding and crushing, and measures the gas content. After the measurement is completed, open the crushing chamber door and take out the coal sample.

[0088] The embodiment of the present invention provides a system and method for closed transfer and integrated crushing of pressure-maintaining and gas-maintaining coring samples. As a system and method for transferring and integrated crushing of in-situ pressure-maintaining and gas-maintaining coring samples of coal seams under closed conditions, it realizes the prevention of gas disasters and resource assessment in coalbed methane development. The gas / coalbed methane content of the coal core sample 11 obtained by the "pressure-maintaining and gas-maintaining" coring process is quickly determined through the in-situ transfer cabin 26 and the crushing cabin, which provides scientific measurement methods and advanced technical equipment for efficient utilization of coalbed methane and safe production in coal mines, overcomes the problem of gas retention and inaccurate measurement in traditional coal seam sampling, and greatly shortens the test time (reduced from tens of hours to a few hours). The small size of the transfer cabin 26 and the crushing cabin is conducive to improving the test accuracy. The smaller the volume of the transfer cabin 26 and the crushing cabin, the better; the smaller the particle size of the cylindrical coal core crushing, the better; on the basis of ensuring the excellence of various functions, the more flexible and smaller the whole machine, the better; the pressure bearing limit of the transfer cabin 26 is ≥1.5MPa, and the pressure bearing limit of the crushing cabin is ≥1.0MPa, and the higher the pressure bearing capacity, the better; select reasonable and reliable safety protection measures, properly handle flammable and explosive gases, control the mechanical vibration amplitude of the whole system, ensure the inherent safety and life of the whole machine at an excellent level, and improve the accuracy of the determination of coal seam gas content or coal seam gas content.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure-maintaining and gas-maintaining coring sample closed transfer integrated crushing system, characterized in that: It includes a closed transfer device for samples in a pressure-maintaining gas coring process connected to a closed coring device, an integrated closed crushing device connected to the closed transfer device for samples in a pressure-maintaining gas coring process and used for crushing coal core samples, and a closed pushing device for pushing coal core samples from the closed transfer device for samples in a pressure-maintaining gas coring process into the integrated closed crushing device; The sample closed transfer device under the pressure-maintaining gas coring process includes a transfer cabin, one end of which is provided with a first connecting component for docking with the closed coring device and the closed pushing device, and the other end of which is provided with a second connecting component for docking with the integrated closed crushing device; The closed corer comprises a corer outer barrel, a core tube disposed in the corer outer barrel and used to fit the coal core sample, a center rod threadedly connected to one end of the core tube, and a pull rod connected to the center rod and extending out of the corer outer barrel; The transfer cabin is provided with a first locking component for locking the core tube, the second connecting component is connected with a removable swivel cabin for the center rod to be inserted, the swivel cabin is provided with a second locking component for locking the center rod, and the swivel cabin is provided with a swivel for driving the center rod to rotate so that the center rod is separated from the core tube; the transfer cabin is connected with a volume compensation cylinder for overcoming the balance between the internal air pressure of the system and the atmospheric pressure during the process of pulling the center rod; The integrated enclosed crushing device includes an enclosed crushing cabin with one end connected to the second connecting component and a crushing component arranged in the enclosed crushing cabin, and a crushing cabin door is arranged at the other end of the enclosed crushing cabin; a first-level crushing cabin and a second-level crushing cabin are arranged in the enclosed crushing cabin, and a screen is provided between the first-level crushing cabin and the second-level crushing cabin.

2. A pressure-maintaining and gas-maintaining coring sample closed transfer integrated crushing system as claimed in claim 1, characterized in that: The first connecting component has a first valve group; the second connecting component has a second valve group.

3. The integrated crushing system for closed transfer of pressure-maintaining and gas-maintaining coring samples as claimed in claim 1, characterized in that: The outer wall of the transfer cabin is provided with a pipeline connected to collect desorbed gas and a stop valve group; The outer wall of the transfer cabin is also provided with an anti-collision safety mechanism to prevent accidents caused by reverse thrust when the closed core drill with internal pressure is opened.

4. A pressure-maintaining and gas-maintaining coring sample closed transfer integrated crushing system as claimed in claim 1, characterized in that: The enclosed crushing chamber is provided with a rotary grinding cutter disc, and the rotary grinding cutter disc is connected with a cutter disc tail column; the enclosed crushing chamber is also provided with a double-layer ball mill component; the double-layer ball mill component comprises a primary crushing drum that can rotate and a secondary crushing drum that rotates in the opposite direction to the primary crushing drum, the primary crushing drum is sleeved outside the secondary crushing drum; the secondary crushing drum has a mesh structure; The outer wall of the closed crushing chamber is provided with a pipeline connected to collect desorbed gas and a stop valve group.

5. The integrated crushing system for closed transfer of pressure-maintaining and gas-maintaining coring samples as claimed in claim 1, characterized in that: A rotary opener is arranged in the enclosed crushing chamber, a driving component for driving the rotary opener to reciprocate along the axial direction of the enclosed crushing chamber is connected to the rear end of the rotary opener, and the rotary opener is provided with an array hole, and the front end diameter of the array hole is smaller than the rear end diameter; The outer wall of the closed crushing chamber is provided with a pipeline connected to collect desorbed gas and a stop valve group.

6. The integrated crushing system for closed transfer of pressure-maintaining and gas-maintaining coring samples as claimed in claim 1, characterized in that: The closed pushing device includes a closed pushing cylinder docked with the first connecting component and a driving component connected to the closed pushing cylinder, and the driving component is connected to a pushing rod for pushing the coal core sample in the closed sample transfer device under the pressure-maintaining and gas-maintaining coring process to the integrated closed crushing device.

7. A method for integrated crushing of pressure-maintaining and gas-maintaining coring samples by closed transfer, characterized in that: A closed transfer integrated crushing system for pressure-maintaining and gas-maintaining coring samples according to any one of claims 1 to 6 is used, comprising the following steps: After the closed corer obtains the coal core sample, the air tightness test is first performed on the closed corer, and a pull rod is externally connected to open the valve group at the first end, the unlocking sleeve of the closed corer is installed, the first locking component clamps the unlocking sleeve, the gyratory chamber and the gyratory device and its components are connected, and the anti-collision safety mechanism is installed. Then, the closed corer together with the pull rod is docked to the first end of the sample closed transfer device under the pressure-maintaining and gas-maintaining coring process, and the pull rod is extended out of the gyratory chamber to ensure dynamic sealing; Close the transfer cabin desorption valve, the closed corer and the valve group at the first end, move the fastening claw to unlock the limit switch inside the closed corer, move the pull rod toward the whirlpool cabin to pull out the center rod and the core barrel, transfer the coal core sample in the closed corer from the first end to the sample closed transfer device under the pressure-maintaining gas coring process, lock the center rod with the second locking component, and the whirlpool and its components loosen the connection between the core barrel and the center rod. The pull rod pulls the center rod into the whirlpool cabin through the valve group at the second end, open the transfer cabin desorption valve, and measure the volume of desorbed gas from the coal sample during the transfer process by the water drainage and gas collection method; After the desorption rate stabilizes, the valve groups at the first and second ends of the transfer cabin are closed, the closed corer at the first end and the swirl cabin at the second end of the sample closed transfer device under the pressure-maintaining gas coring process are removed, and the closed push device is docked at the first end of the sample closed transfer device under the pressure-maintaining gas coring process; The second end of the sample closed transfer device is connected to the integrated closed crushing device in the pressure-maintaining and gas-maintaining coring process; Open the valve group at the first end and the valve group at the second end; push the coal core sample in the sample closed transfer device under the pressure-maintaining gas coring process to the integrated closed crushing device through the closed pushing device; close the valve group at the second end and the transfer cabin desorption valve; The integrated closed crushing device dries and crushes the coal core sample, opens the desorption valve of the closed crushing cabin of the integrated closed crushing device, and measures the desorption gas volume of the coal sample during the drying and crushing process by the water drainage and gas collection method; the desorption is completed when no bubbles are generated in the gas collection cylinder within 5 minutes, closes the desorption valve group and pipeline valve group of the test instrument, and records the reading of the gas collection cylinder, ambient temperature and atmospheric pressure; Collect and weigh powder samples that meet the target particle size for later data processing.

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