Liquid CO2 phase change pressure relief anti-reflection device for coal mine tunnel

Abstract

The utility model belongs to the technical field of coal mine tunnels, and discloses a coal mine tunnel liquid CO2 phase change pressure relief and permeability increase device, which comprises a pressure relief and permeability increase mechanism arranged between a CO tank car and a low-temperature booster pump, the pressure relief and permeability increase mechanism comprises an exhaust pipe and a liquid discharge pipe, the exhaust pipe and the liquid discharge pipe are fixedly connected in the CO tank car, and the low-temperature booster pump is arranged in the CO tank car. A gas guide pipe is installed in the exhaust pipe, a liquid guide pipe is installed in the liquid discharge pipe, a gas inlet phase inlet pipe and a booster pump liquid inlet phase inlet pipe are arranged on the outer side of the low-temperature booster pump, a controller is arranged on the outer side of the low-temperature booster pump, an alarm mechanism is arranged on the outer side of the low-temperature booster pump, and the alarm mechanism comprises a communicating pipe. The top of the communicating pipe is fixedly connected with an air pressure box, the inner wall of the air pressure box is fixedly connected with a reset spring, and the liquid CO2 phase change pressure relief and permeability increase device for the coal mine roadway has the advantage of being capable of conducting phase change pressure relief and permeability increase on the liquid CO2 in the coal mine roadway.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mine tunnels, in particular to a liquid CO2 phase change pressure relief and permeability enhancement device for coal mine tunnels. Background Art

[0002] A certain range of fractured zones already existed before drilling. After drilling, fractured zones, plastic zones, elastic zones, and in-situ rock stress zones were formed along the borehole axis from the borehole opening to the depth of the coal body. During the injection process, the downhole test system consisted of a liquid CO2 tanker, injection pump, injection pipes and fittings, instruments, and a dedicated hole sealer.

[0003] During use, the basic parameters of coal seam gas are sampled and measured, mainly measuring the coal seam gas content in the test target area, industrial analysis of coal, coal solidity coefficient, initial gas release velocity, true density of coal, apparent density, porosity of coal, coal seam gas adsorption constant and other parameters. Therefore, it is necessary to carry out liquid CO2 phase change pressure relief and permeability enhancement treatment.

[0004] Therefore, in order to solve the above problems, a liquid CO2 phase change pressure relief and permeability enhancement device for coal mine tunnels is proposed. Utility Model Content

[0005] In order to solve the problems raised in the above background technology, the utility model provides a coal mine tunnel liquid CO2 phase change pressure relief and permeability enhancement device, which has the advantage of being able to effectively relieve pressure and enhance permeability of liquid CO2 in coal mine tunnels.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a liquid CO2 phase change pressure relief and permeability enhancement device in a coal mine tunnel, comprising a CO2 tank car and a low-temperature booster pump, wherein a pressure relief and permeability enhancement mechanism is provided between the CO2 tank car and the low-temperature booster pump;

[0007] The pressure relief and permeability enhancement mechanism includes an exhaust pipe and a drain pipe, which are fixedly connected to the interior of the CO tanker. An air guide pipe is installed inside the exhaust pipe, and a liquid guide pipe is installed inside the drain pipe. An air inlet pipe and a liquid inlet pipe of the pressure pump are provided on the outside of the low-temperature booster pump, and a controller is provided on the outside of the warm booster pump.

[0008] Preferably, an alarm mechanism is provided on the outside of the low-temperature booster pump, and the alarm mechanism includes a connecting pipe, the top of the connecting pipe is fixedly connected to an air pressure box, a return spring is fixedly connected to the inner wall of the air pressure box, the outside of the return spring is fixedly connected to a movable plate, the outside of the movable plate is fixedly connected to an extrusion rod, the outside of the air pressure box is fixedly connected to a power box, an elastic switch is provided on the outside of the power box, and an alarm light is fixedly connected to the outside of the power box.

[0009] Preferably, the exhaust pipe and the liquid discharge pipe are symmetrically distributed on the outside of the CO tanker, and the exhaust pipe and the liquid discharge pipe are connected to the low-temperature booster pump through the air guide pipe, the liquid guide pipe and the low-temperature booster pump.

[0010] Preferably, a flow meter is provided at the connection between the liquid guide tube and the liquid phase inlet pipe of the pressure pump, and one end of the liquid guide tube and the gas guide tube is located inside the gas phase inlet pipe and the liquid phase inlet pipe of the pressure pump.

[0011] Preferably, one end of the connecting pipe is fixedly connected to the inside of the air inlet pipe, and the air pressure box is fixedly connected to the outside of the low-temperature booster pump.

[0012] Preferably, the return spring is symmetrically distributed between the moving plate and the inner wall of the air pressure box, and the elastic switch is located inside the air pressure box.

[0013] Preferably, the power box and the alarm light are electrically connected, and the extrusion rod and the elastic switch are on the same plane.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. The utility model sets up a CO2 tank truck and a low-temperature booster pump, opens the exhaust valve of the CO2 tank truck and the liquid injection valve of the hole sealer to establish a gas phase balance among the tank truck, the booster pump and the borehole, closes the exhaust valve of the CO2 tank truck, opens the liquid discharge valve of the CO2 tank truck, installs a flow meter on the pipeline connecting the liquid outlet of the booster pump and valve 2, starts the booster pump, and injects liquid CO2 into the hole.

[0016] 2. The utility model is equipped with a low-temperature booster pump. When the air pressure entering the air inlet pipe is relatively high, the air pressure inside the air pressure box will increase through the connecting pipe, so that the movable plate drives the extrusion rod to squeeze the elastic switch, causing the alarm light on the outside of the power box to light up, thereby achieving the effect of an automatic alarm light. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the side surface of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the outer side of the alarm mechanism of the utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the power box and the outer side of the movable plate of the utility model;

[0021] Figure 5 For this utility model Figure 1 A magnified view of the structure in the middle.

[0022] In the figure: 1. CO2 tank truck; 2. Low-temperature booster pump; 3. Pressure relief and permeability enhancement mechanism; 31. Exhaust pipe; 32. Liquid discharge pipe; 33. Gas guide pipe; 34. Liquid guide pipe; 35. Gas inlet pipe; 36. Liquid inlet pipe of booster pump; 37. Controller; 4. Alarm mechanism; 41. Connecting pipe; 42. Air pressure box; 43. Return spring; 44. Moving plate; 45. Extrusion rod; 46. Power supply box; 47. Elastic switch; 48. Alarm light. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] like Figures 1 to 5 As shown, the utility model provides a liquid CO2 phase change pressure relief and permeability enhancement device for coal mine tunnels, comprising a CO2 tank car 1 and a low-temperature booster pump 2, wherein a pressure relief and permeability enhancement mechanism 3 is provided between the CO2 tank car 1 and the low-temperature booster pump 2;

[0025] The pressure relief and permeability enhancement mechanism 3 includes an exhaust pipe 31 and a liquid discharge pipe 32, which are fixedly connected to the interior of the CO2 tanker 1. An air guide pipe 33 is installed inside the exhaust pipe 31, and a liquid guide pipe 34 is installed inside the liquid discharge pipe 32. An air inlet pipe 35 and a pressure pump liquid inlet pipe 36 are provided on the outside of the low-temperature booster pump 2, and a controller 37 is provided on the outside of the warm booster pump 2.

[0026] Specifically, the exhaust pipe 31 and the liquid discharge pipe 32 are symmetrically distributed on the outside of the CO2 tanker 1, and the exhaust pipe 31 and the liquid discharge pipe 32 are connected to the low-temperature booster pump 2 through the air guide pipe 33 and the liquid guide pipe 34.

[0027] like Figures 1 to 5 As shown, the initial pressure of the tank body is not less than 1.8MPa, the design injection pressure is: 2~6MPa, and the injection volume of a single hole is: ≥0.6m3 / time LCO2; among them: the total injection volume of Y1 hole is expected to be 8m3, and the Y2 hole is expected to continue to inject at a constant pressure for 3~5 days.

[0028] Furthermore, a flow meter is provided at the connection between the liquid guide tube 34 and the liquid phase inlet pipe 36 of the pressure pump. One end of the liquid guide tube 34 and the gas guide tube 33 is located inside the gas phase inlet pipe 35 and the liquid phase inlet pipe 36 of the pressure pump, and a pressure pump is provided inside the low-temperature booster pump 2.

[0029] like Figures 1 to 5As shown, an alarm mechanism 4 is provided on the outside of the low-temperature booster pump 2, and the alarm mechanism 4 includes a connecting pipe 41. The top of the connecting pipe 41 is fixedly connected to an air pressure box 42, and a return spring 43 is fixedly connected to the inner wall of the air pressure box 42. The outside of the return spring 43 is fixedly connected to a movable plate 44, and the outside of the movable plate 44 is fixedly connected to an extrusion rod 45. The outside of the air pressure box 42 is fixedly connected to a power box 46, and an elastic switch 47 is provided on the outside of the power box 46. The outside of the power box 46 is fixedly connected to an alarm light 48.

[0030] It is worth noting that one end of the connecting pipe 41 is fixedly connected to the inside of the gas inlet pipe 35 , and the air pressure box 42 is fixedly connected to the outside of the low-temperature booster pump 2 .

[0031] like Figures 1 to 5 As shown, the return spring 43 is symmetrically distributed between the moving plate 44 and the inner wall of the air pressure box 42 , and the elastic switch 47 is located inside the air pressure box 42 .

[0032] It is worth emphasizing that the power box 46 and the warning light 48 are electrically connected, and the extrusion rod 45 and the elastic switch 47 are on the same plane.

[0033] Working principle and process: connect the exhaust pipe 31 of the CO2 tanker 1 to the gas phase inlet pipe 35 of the pressure pump through the air guide pipe 33, connect the discharge pipe 32 of the CO2 tanker 1 to the liquid phase inlet pipe 36 of the pressure pump through the liquid guide pipe 34, connect the liquid outlet of the pressure pump to the liquid injection port of the hole sealer, open the exhaust pipe valve of the CO2 tanker 1 and the liquid injection valve of the hole sealer and the pipeline valve, establish the gas phase balance of the CO2 tanker 1, the low-temperature booster pump 2 and the borehole, close the valve of the exhaust pipe 31 of the CO2 tanker 1, open the valve of the discharge pipe 32 of the CO2 tanker 1, and install a flow meter on the pipeline connecting the liquid outlet of the pressure pump and the valve. Turn on the pressure pump and inject liquid CO2 into the hole. The liquid CO2 continuously enters the injection hole through the pressure pump. Monitor the drilling pressure, pipeline flow, and inspection hole temperature information online, and continuously observe the pressure difference change of the inspection hole. After the injection is completed, close the injection hole valve to maintain the pressure of the drilling hole and release the pipeline pressure. When the air pressure entering the air inlet pipe 35 is relatively high, the air pressure inside the air pressure box 42 will increase through the connecting pipe 41, so that the movable plate 44 drives the extrusion rod 45 to squeeze the elastic switch 43, so that the alarm light 48 outside the power box 46 lights up, achieving the effect of an automatic alarm light.

[0034] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid CO2 phase change pressure relief and permeability enhancement device for coal mine tunnels, comprising a CO2 tanker (1) and a low-temperature booster pump (2), characterized in that: A pressure relief and permeability enhancement mechanism (3) is provided between the CO2 tanker (1) and the low-temperature booster pump (2); The pressure relief and permeability enhancement mechanism (3) comprises an exhaust pipe (31) and a liquid discharge pipe (32), wherein the exhaust pipe (31) and the liquid discharge pipe (32) are fixedly connected to the interior of the CO2 tanker (1), an air guide pipe (33) is installed inside the exhaust pipe (31), and a liquid guide pipe (34) is installed inside the liquid discharge pipe (32), an air inlet pipe (35) and a pressure pump liquid inlet pipe (36) are provided on the outside of the low-temperature booster pump (2), and a controller (37) is provided on the outside of the warm booster pump (2).

2. The liquid CO2 phase change pressure relief and permeability enhancement device for coal mine tunnels according to claim 1, characterized in that: An alarm mechanism (4) is provided on the outside of the low-temperature booster pump (2), and the alarm mechanism (4) includes a connecting pipe (41), the top of the connecting pipe (41) is fixedly connected to an air pressure box (42), the inner wall of the air pressure box (42) is fixedly connected to a return spring (43), the outer side of the return spring (43) is fixedly connected to a movable plate (44), the outer side of the movable plate (44) is fixedly connected to an extrusion rod (45), the outer side of the air pressure box (42) is fixedly connected to a power box (46), the outer side of the power box (46) is provided with an elastic switch (47), and the outer side of the power box (46) is fixedly connected to an alarm light (48).

3. The liquid CO2 phase change pressure relief and permeability enhancement device for coal mine tunnels according to claim 1, characterized in that: The exhaust pipe (31) and the liquid discharge pipe (32) are symmetrically distributed on the outside of the CO2 tanker (1), and the exhaust pipe (31) and the liquid discharge pipe (32) are connected to the low-temperature booster pump (2) through the air guide pipe (33) and the liquid guide pipe (34).

4. The liquid CO2 phase change pressure relief and permeability enhancement device for coal mine tunnels according to claim 1, characterized in that: A flow meter is provided at the connection between the liquid guide tube (34) and the pressure pump liquid phase inlet tube (36), and one end of the liquid guide tube (34) and the air guide tube (33) is located inside the air phase inlet tube (35) and the pressure pump liquid phase inlet tube (36).

5. The coal mine tunnel liquid CO2 phase change pressure relief and permeability enhancement device according to claim 2, characterized in that: One end of the connecting pipe (41) is fixedly connected to the inside of the gas inlet pipe (35), and the air pressure box (42) is fixedly connected to the outside of the low-temperature booster pump (2).

6. The liquid CO2 phase change pressure relief and permeability enhancement device for coal mine tunnels according to claim 2, characterized in that: The return spring (43) is symmetrically distributed between the moving plate (44) and the inner wall of the air pressure box (42), and the elastic switch (47) is located inside the air pressure box (42).

7. The liquid CO2 phase change pressure relief and permeability enhancement device for coal mine tunnels according to claim 2, characterized in that: The power supply box (46) is electrically connected to the warning light (48), and the extrusion rod (45) and the elastic switch (47) are located on the same plane.

Images