CN206420736U - A kind of coal containing methane gas seepage flow test device for considering Crack change - Google Patents

Abstract

The utility model discloses a gas-containing coal seepage test device considering the change of cracks. The test piece loading sealing cavity is filled with test piece coal, and the other end of the test piece loading sealing cavity is connected to the gas tank through a pipeline. A pressure sensor and a flow sensor fixed on the side wall of the crack test piece box are respectively arranged above the two ends of the crack plane. The utility model can not only be loaded with crack devices with test pieces of different crack opening widths to realize the adjustability of the cracks in the test pieces, facilitate the seepage of gas-containing coal from the cracks, but also accurately obtain the seepage of gas-containing coal under different pressure conditions. The change trend of the seepage characteristics is convenient to reflect the seepage characteristics of the fracture change more truly, and the accurate and stable pressure value and flow value can be obtained, the accuracy of the test is improved, and the accuracy and authenticity of the measurement of the fracture seepage test are ensured. The efficiency of the test is improved and the cost of the test is saved.

Description

A Seepage Test Device for Gas-Containing Coal Considering Fracture Variation

technical field

The utility model relates to the technical field of seepage test devices, in particular to a gas-containing coal seepage test device considering the change of cracks.

Background technique

For gas-containing coal seams with fractures, when there is gas in the fractures, the pressure of the gas will lead to the gradual destabilization and destruction of the coal seams. It is one of the important reasons for large-scale coal mine accidents. Therefore, to study the impact of fractures on gas-bearing coal requires understanding the permeability characteristics of fractured coal seams. At present, most studies on the permeability characteristics of gas-containing coal seams with fractures are based on certain theorems, and this The applicable condition of this theorem is that the upper and lower surfaces of the cracks are basically parallel and the roughness is very small. In the test process of most studies, the specimens are clamped by the fixture, and the opening width of the cracks is changed by changing the gap between the cracks. The seepage of gas in the gas coal seam, and the pressure cannot be adjusted, cannot truly simulate the seepage process of gas-containing coal with changes in natural fractures. Therefore, it is necessary to provide a gas-containing coal seepage test device considering the change of cracks.

Utility model content

The purpose of this utility model is to provide a gas-containing coal seepage test device considering the change of cracks, so as to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the utility model provides the following technical solutions:

A gas-containing coal seepage test device that considers changes in cracks, including a crack test specimen box, an inlet is provided in the middle of the bottom surface of the crack test specimen box, and a test piece loading sealing cavity connected by a pipeline is provided on the inlet, The test piece loading sealing cavity is filled with test piece coal, the channel connecting the test piece loading sealing cavity and the crack test piece box is provided with a vacuum pump connected through the channel, and the other end of the test piece loading sealing cavity is It is connected to the gas tank through a pipeline, and a booster pump is provided on the pipeline between the gas tank and the test piece loading sealed cavity, and an air inlet valve is provided on the pipeline between the booster pump and the gas tank. The gas tank is connected to the air outlet on the top surface of the cracked test piece box through a pipeline, and the pipeline between the cracked test piece box and the gas tank is provided with an air outlet valve, and the middle part of the cracked test piece box is provided with a partition plate, so The dividing plate includes a large dividing plate and a small dividing plate, and the opposite surfaces of the large dividing plate and the small dividing plate are provided with crack planes used in conjunction with each other, and the small dividing plate is sealed and fixed in the cracked test piece box Above the two ends of the crack plane, a pressure sensor and a flow sensor fixed on the side wall of the crack test piece box are respectively arranged, and the middle part of the same side wall of the crack test piece box and the large partition plate is provided with a fixing frame, The middle part of the fixed frame is provided with a threaded hole, and one end of the large partition plate away from the small partition plate extends out of the crack specimen box and is connected with one end of the threaded rod through a bearing, and the other end of the threaded rod passes through the Threaded holes and a hand wheel.

Preferably, both ends of the large partition are connected to the side walls of both ends of the cracked specimen box through a chute, and the top surface of the cracked specimen box is transparent glass, and an elastic rubber layer is provided in the chute.

Preferably, both the pressure sensor and the flow sensor are connected to the smart terminal through wires.

Preferably, the side walls at both ends of the crack test piece box are provided with corresponding scale lines, and the scale lines are located directly above the chute.

Preferably, a sealing layer is provided between the large partition plate and the fracture specimen box, and the shape and size of the large partition plate are larger than those of the small partition plate.

Compared with the prior art, the beneficial effect of the utility model is: before the utility model is used, the whole test device is installed first, and then the whole test device is pumped through the operation of the vacuum pump, which avoids the influence of some external factors According to the results of the test data, the test piece is filled with coal in the sealed cavity of the test piece, and a partition plate is set in the cracked specimen box, and the large partition plate is driven by the hand wheel to move, and when the large partition plate and the small When there are cracks and plane gaps between the partitions, open the intake valve connected to the gas tank, and through the setting of the booster pump and the gas enters the test piece loading sealed cavity and contacts with the test piece coal, so as to facilitate the gas containing The coal seepage test can be carried out smoothly, so that the gas-containing coal enters the crack test piece box, and the data obtained by the pressure sensor and the flow sensor are transmitted to the intelligent terminal for processing and storage, and the inlet valve is closed and the outlet valve is passed Circulating the gas-containing coal in the cracked test piece box into the gas tank can realize the self-circulation effect of gas, and also improve the safety of the test, and adjust the gap between the large partition and the small partition again through the scale line By analogy, the data obtained by the pressure sensor and flow sensor are then transmitted to the intelligent terminal for processing and storage, and the experimental device for seepage of gas-containing coal can be realized through the change of the crack. The utility model can not only be loaded with crack devices with different crack opening width test pieces to realize the adjustability of the test piece cracks, facilitate the seepage of gas-containing coal from the cracks, but also accurately obtain the seepage of gas-containing coal under different pressure conditions. The change trend of the seepage characteristics is convenient to reflect the seepage characteristics of the fracture change more truly, and the accurate and stable pressure value and flow value can be obtained, the accuracy of the test is improved, and the accuracy and authenticity of the measurement of the fracture seepage test are ensured. The efficiency of the test is improved and the cost of the test is saved.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is a top view of the structure of the fracture test piece box of the present invention.

In the figure: 1 crack test piece box, 2 inlet, 3 test piece loading sealed cavity, 4 test piece coal, 5 vacuum pump, 6 gas tank, 7 booster pump, 8 air inlet valve, 9 air outlet, 10 air outlet valve , 11 partition, 12 large partition, 13 small partition, 14 crack plane, 15 pressure sensor, 16 flow sensor, 17 fixed frame, 18 threaded hole, 19 threaded rod, 20 hand wheel, 21 chute, 22 elastic rubber layers.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Figure 1-2, the utility model provides a technical solution:

A gas-containing coal seepage test device considering changes in cracks, comprising a crack test specimen box 1, an inlet 2 is provided in the middle of the bottom surface of the crack test specimen box 1, and a test specimen loading and sealing cavity connected by a pipeline is provided on the inlet 2 3. The test piece loading sealed cavity 3 is filled with test piece coal 4, which is convenient for testing. The passage connecting the test piece loading sealed cavity 3 and the crack test piece box 1 is provided with a vacuum pump 5 connected through the passage to avoid Because of some factors, the other end of the test piece loading sealed cavity 3 is connected to the gas tank 6 through a pipeline, and a booster pump 7 is arranged on the pipeline between the gas tank 6 and the test piece loading sealed cavity 3 , can provide different pressures for testing, the pipeline between the booster pump 7 and the gas tank 6 is provided with an air inlet valve 8, the gas tank 6 is connected to the air outlet 9 on the top surface of the crack test piece box 1 through the pipeline, and the crack test A gas outlet valve 10 is provided on the pipeline between the piece box 1 and the gas tank 6, which is convenient for recycling. The middle part of the crack test piece box 1 is provided with a partition plate 11, and the partition plate 11 includes a large partition plate 12 and a small partition plate. Plate 13, the opposite surface of the large dividing plate 12 and the small dividing plate 13 are all provided with a crack plane 14 used in conjunction, and the small dividing plate 13 is sealed and fixed on the crack test piece box 1, and the two ends of the crack plane 14 A pressure sensor 15 and a flow sensor 16 respectively fixed on the side wall of the crack test piece box 1 are arranged above. Both the pressure sensor 15 and the flow sensor 16 are connected to the intelligent terminal through wires, so as to facilitate the collection and storage of the obtained data information. Oita Both ends of the partition 12 are connected to the side walls of both ends of the crack test piece box 1 through the chute 21, and the top surface of the crack test piece box 1 is transparent glass, and an elastic rubber layer 22 is arranged in the chute 21, and the crack test piece Corresponding scale lines are provided on the side walls of both ends of the case 1, and the scale lines are located directly above the chute 21, which is convenient for quickly adjusting the required size. A sealing layer is provided to improve the sealing performance, and the shape and size of the large partition plate 12 are larger than the shape and size of the small partition plate 13, and the middle part of the same side wall of the crack test piece box 1 and the large partition plate 12 is provided with a fixing frame 17, The middle part of fixing frame 17 is provided with threaded hole 18, and one end of big dividing plate 12 away from small dividing plate 13 extends to the outside of crack test piece box 1 and is connected with an end of threaded rod 19 by bearing, is convenient to the slit of adjusting crack, screw thread The other end of the rod 19 passes through the threaded hole 18 and is provided with a hand wheel 20 for easy adjustment.

Before the utility model is used, the whole test device is installed first, and then the vacuum pump 5 is used to pump the whole test device first, so as to avoid some external factors from affecting the results of the test data, and the test piece is loaded with a sealed cavity 3 is filled with test piece coal 4, and a partition plate 11 is provided in the crack test piece box 1, and the large partition plate 12 is driven by the hand wheel 20 to move, and when the large partition plate 12 and the small partition plate 13 are left When the gap between the plane 14 with cracks is constant, open the intake valve connected to the gas tank 6, and through the setting of the booster pump 7 and the gas enters the test piece loading sealed cavity 3 and contacts with the test piece coal 4, so as to facilitate the gas containing The gas-coal seepage test can be carried out smoothly, so that the gas-containing coal enters the crack test piece box 1, and the data obtained by the pressure sensor 15 and the flow sensor 16 are transmitted to the intelligent terminal for processing and storage, and the intake valve is closed 8 At the same time, the gas-containing coal in the fracture test piece box 1 is circulated to the gas tank 6 through the gas outlet valve 10, which can realize the self-circulation effect of gas, and also improve the safety of the test, and adjust the large separation again through the scale line The distance between the plate 12 and the small partition plate 13, and so on. The data obtained by the pressure sensor 15 and the flow sensor 16 are then transmitted to the intelligent terminal for processing and storage, and the seepage of gas-containing coal can be realized through the change of the crack. experimental device. The utility model can not only be loaded with crack devices with different crack opening width test pieces to realize the adjustability of the test piece cracks, facilitate the seepage of gas-containing coal from the cracks, but also accurately obtain the seepage of gas-containing coal under different pressure conditions. The change trend of the seepage characteristics is convenient to reflect the seepage characteristics of the fracture change more truly, and the accurate and stable pressure value and flow value can be obtained, the accuracy of the test is improved, and the accuracy and authenticity of the measurement of the fracture seepage test are ensured. The efficiency of the test is improved and the cost of the test is saved.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes and modifications can be made to these embodiments without departing from the principle and spirit of the present invention , replacements and modifications, the scope of the present utility model is defined by the appended claims and their equivalents.

Claims (5)

1. a kind of coal containing methane gas seepage flow test device for considering Crack change, including crack test piece box (1), it is characterised in that：Institute State and inlet port (2) is provided with the middle part of the bottom surface of crack test piece box (1), the inlet port (2) is provided with the test specimen connected by pipeline Seal cavity (3) is loaded, the test specimen loads and test specimen coal (4) is filled with seal cavity (3), and the test specimen loads seal cavity (3) passage being connected with crack test piece box (1) is provided with by channel attached vavuum pump (5), and the test specimen loads annular seal space The other end of body (3) is connected by pipeline with gas pot (6), between the gas pot (6) and test specimen loading seal cavity (3) Pipeline is provided with booster pump (7), and the pipeline between the booster pump (7) and gas pot (6) is provided with intake valve (8), described watt This tank (6) is connected by pipeline with the gas outlet (9) of crack test piece box (1) top surface, and crack test piece box (1) and gas pot (6) Between pipeline be provided with air outlet valve (10), the middle part in the crack test piece box (1) is provided with demarcation strip (11), the demarcation strip (11) including big demarcation strip (12) and small demarcation strip (13), on the opposite face of the big demarcation strip (12) and small demarcation strip (13) Provided with the crack plane (14) being used in combination, and small demarcation strip (13) sealing is fixed in crack test piece box (1), the crack The pressure sensor (15) and flow sensing being fixed on the wall of crack test piece box (1) side are respectively equipped with above the two ends of plane (14) Device (16), the crack test piece box (1) in the middle part of the wall of big demarcation strip (12) identical side with being provided with fixed mount (17), the fixation The middle part of frame (17) is provided with screwed hole (18), and one end of the remote small demarcation strip (13) of the big demarcation strip (12) extends to crack Test piece box (1) is connected outside and with one end of threaded rod (19) by bearing, and the other end of the threaded rod (19) passes through screwed hole (18) and provided with handwheel disk (20).

2. a kind of coal containing methane gas seepage flow test device for considering Crack change according to claim 1, it is characterised in that：Institute The two ends for stating big demarcation strip (12) are connected by chute (21) with two side walls of crack test piece box (1), and crack test piece box (1) top surface is that elastic rubber layer (22) is provided with clear glass, the chute (21).

3. a kind of coal containing methane gas seepage flow test device for considering Crack change according to claim 1, it is characterised in that：Institute State pressure sensor (15) and flow sensor (16) is connected by wire with intelligent terminal.

4. a kind of coal containing methane gas seepage flow test device for considering Crack change according to claim 1 or 2, its feature exists In：Corresponding graduation mark is equipped with two side walls of the crack test piece box (1), and graduation mark is being located at chute (21) just Top.

5. a kind of coal containing methane gas seepage flow test device for considering Crack change according to claim 1, it is characterised in that：Institute State and sealant is provided between big demarcation strip (12) and crack test piece box (1), and the geomery of big demarcation strip (12) is more than small point The geomery of dividing plate (13).