Water fracturing coal automatic control system

Abstract

The utility model relates to an automatic control system for water fracturing coal, which comprises a water pressure system and a pneumatic control valve system, the water pressure system comprises a water supply pipe and a water supply tank, a water injection pump and a high-pressure pump which are sequentially arranged on the water supply pipe, and the pneumatic control valve system comprises a pneumatic ball valve, an electromagnetic pneumatic valve and a gas supply pipe communicated with a high-pressure gas source. An inlet of the electromagnetic pneumatic valve is connected with the air supply pipe, an outlet of the electromagnetic pneumatic valve is connected with a control port of the pneumatic ball valve, an outlet of the pneumatic ball valve is connected with the hole packer, and an inlet of the pneumatic ball valve is connected with the water supply pipe. A hydraulic pressure pipeline adopts a mode of combining an electric control system and a pneumatic control system, so that the system works more stably, the failure rate is low, and normal work under a mine is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic fracturing coal, in particular to an automatic control system for hydraulic fracturing coal. Background Art

[0002] For coal seams with low average permeability coefficient, gas is difficult to extract or the extraction efficiency is very low. Gas extraction is difficult and time-consuming, which limits the mining period. In addition, the coal dust concentration is very high during the mining process, and it is impossible to effectively reduce the coal dust concentration by relying solely on spray dust suppression equipment. For coal seams with hard roofs, the effect of top coal caving is not good.

[0003] The above problems can be solved by using hydraulic fracturing coal technology. Hydraulic fracturing coal technology is to drill holes in the coal body according to the designed position, the designed drilling depth and size, and then place a sealer. Pressurized water is injected into the coal body through the sealer to fracture and soften the coal body. At the same time, floating gas may be released. Through long-term water injection and drainage, the gas concentration is reduced and the risk of gas outburst is reduced; releasing gas in advance reduces subsequent mining costs, speeds up the preparation period for mining, and reduces the hazards of coal dust during the mining process. At the same time, the extracted gas can be stored and reasonably reused to avoid waste of resources.

[0004] During the hydraulic fracturing process of coal, high-pressure water needs to be injected into the sealer through the control system. The existing control system simply supplies water through a high-pressure pump, which has poor safety performance. In addition, the pressure of the high-pressure water is high, and the electronically controlled valve is prone to malfunction, affecting normal use. Utility Model Content

[0005] The utility model aims at the deficiencies of the prior art and provides an automatic control system for hydraulic fracturing coal.

[0006] The utility model is realized through the following technical scheme, which provides an automatic control system for hydraulic fracturing coal, including a water pressure system and an air control valve system, wherein the water pressure system includes a water supply pipe and a water supply box, a water injection pump and a high-pressure pump arranged in sequence on the water supply pipe, and the air control valve system includes a pneumatic ball valve, an electromagnetic pneumatic valve and an air supply pipe connected to a high-pressure air source, the inlet of the electromagnetic pneumatic valve is connected to the air supply pipe, the outlet of the electromagnetic pneumatic valve is connected to the control port of the pneumatic ball valve, the outlet of the pneumatic ball valve is connected to a hole sealer, and the inlet of the pneumatic ball valve is connected to the water supply pipe.

[0007] The water injection pump of the water pressure system in this scheme draws water from the water supply tank to inject water into the high-pressure pump. The high-pressure pump provides water pressure of different pressures to the system. When a certain sealer needs to be opened, the controller controls the electromagnetic pneumatic valve corresponding to the sealer, and the high-pressure gas enters the corresponding pneumatic ball valve to open it. The high-pressure water in the water supply pipe enters the sealer through the pneumatic ball valve to realize the work.

[0008] As an optimization, an overflow valve is installed on the water supply pipe at the outlet of the high-pressure pump. The overflow valve provided on the water supply pipe in this solution can realize automatic pressure relief.

[0009] As an optimization, the water supply pipe at the outlet of the high-pressure pump is connected to a return pipe, and a manual pressure relief valve is installed on the return pipe. The manual pressure relief valve provided in this solution can realize manual pressure relief.

[0010] As an optimization, the water supply pipes at the inlet and outlet of the high-pressure pump are equipped with one-way valves. The one-way valves provided in this solution can prevent water from flowing back and ensure the stability of the system.

[0011] As an optimization, the pneumatic control valve system includes multiple pneumatic ball valves and multiple electromagnetic pneumatic valves, so that multiple hole sealers can be controlled to work simultaneously.

[0012] As an optimization, a manual air valve is installed on the air supply pipe. The manual air valve provided in this solution can manually open and close the air circuit, preventing false triggering and ensuring the safety of the system.

[0013] As an optimization, the air supply pipe is equipped with a pneumatic triplex, which includes an air filter, a pressure reducing valve and an oil mist collector.

[0014] The beneficial effects of the utility model are as follows: the utility model is an automatic control system for hydraulic fracturing coal, the hydraulic equipment is composed of a water injection pump and a high-pressure pump, wherein the high-pressure pump is controlled by a variable frequency motor, and the hydraulic pipeline adopts a combination of electric and pneumatic control systems, the system works more stably, the failure rate is low, and normal operation in the mine is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model;

[0016] As shown in the figure:

[0017] 1. Water pressure system, 2. Air-controlled valve system, 3. Controller, 4. Sealer, 11. Water supply tank, 12. Filter, 13. Water injection pump, 14. High-pressure pump, 15. Water supply pipe, 16. Manual water valve, 17. Overflow valve, 18. Return water tank, 19. Return water pipe, 21. Pneumatic ball valve, 22. Solenoid pneumatic valve, 23. Air supply pipe, 24. Manual air valve, 25. Pneumatic triplex. DETAILED DESCRIPTION

[0018] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0019] like Figure 1 As shown, the utility model is an automatic control system for hydraulic fracturing coal, which includes a hydraulic system 1 and a gas control valve system 2.

[0020] The water pressure system 1 includes a water supply pipe 15 and a water supply tank 11, a water injection pump 13 and a high-pressure pump 14 arranged on the water supply pipe 15 in sequence. The water supply tank 11 is located at the beginning of the water supply pipe 15, and the end of the water supply pipe 15 outputs high-pressure water to the outside.

[0021] An overflow valve 17 is installed on the water supply pipe 15 at the outlet of the high-pressure pump 14. The overflow valve 17 is connected to a return water tank 18 for containing the pressure-relieved water of the overflow valve 17.

[0022] The water supply pipe 15 at the outlet of the high-pressure pump 14 is connected to a return pipe 19 , which is also connected to a return water tank 18 . A manual pressure relief valve is installed on the return pipe 19 .

[0023] A pressure gauge is also provided on the water supply pipe 15 at the outlet of the high-pressure pump 14 to display the water pressure.

[0024] The water supply pipes 15 at the inlet and outlet of the high-pressure pump 14 are all equipped with one-way valves. In this embodiment, the water supply pipes 15 at the inlet and outlet of the water injection pump 13 are also all equipped with one-way valves. A filter 12 is installed between the one-way valve at the inlet of the water injection pump 13 and the water supply tank 11 to filter impurities in the water.

[0025] The air-controlled valve system 2 includes a pneumatic ball valve 21, an electromagnetic pneumatic valve 22 and an air supply pipe 23 connected to a high-pressure air source. In this embodiment, the air-controlled valve system 2 includes multiple pneumatic ball valves 21 and multiple electromagnetic pneumatic valves 22, thereby controlling multiple hole sealers 4.

[0026] A manual air valve 24 and a pneumatic triplex 25 are mounted on the air supply pipe 23. The pneumatic triplex 25 comprises an air filter, a pressure reducing valve and an oil mist collector.

[0027] The inlet of the electromagnetic pneumatic valve 22 is connected to the air supply pipe 23, and the outlet of the electromagnetic pneumatic valve 22 is connected to the control port of the pneumatic ball valve 21. When the controller controls the electromagnetic pneumatic valve 22 to open, high-pressure gas enters the control port of the pneumatic ball valve 21 to open the pneumatic ball valve 21.

[0028] The outlet of the pneumatic ball valve 21 is connected to the hole sealer 4 , and the inlet of the pneumatic ball valve 21 is connected to the water supply pipe 15 .

[0029] It also includes a controller that controls the opening and closing of the water injection pump 13 and the high-pressure pump 14.

[0030] The controller monitors the data of each sensor in real time and reports the current system status in real time through the sound and light alarm. At the same time, the controller controls the solenoid valve to control the pneumatic valve group as the actuator.

[0031] In this embodiment, the electromagnetic pneumatic valve 22 is an explosion-proof electromagnetic pneumatic valve, and each hole sealing device pipeline is equipped with a water pressure sensor.

[0032] The use method of this utility model:

[0033] The sealer is placed in the coal hole drilled according to the design parameters. The end expands to seal the pressure of the water injection. Water injection-pressure maintenance-water injection-pressure maintenance are carried out according to the design parameters to achieve the effect of softening the coal body. The layout position of the sealer is arranged according to the design parameters. After one sealer completes the water injection and fracturing design operation process, the second sealer water injection and fracturing operation process is carried out. According to the specific conditions of the coal mine, the sealer can select the water injection and fracturing function, or the function of integrating water injection and fracturing with gas collection.

[0034] The water injection pump of the water pressure system 1 draws water filtered by the filter 12 from the water supply tank 11 to inject water into the high-pressure pump 14. The high-pressure pump 14 provides water pressure of different pressures to the system through the frequency conversion motor. The pipeline has an overflow valve 17, an automatic pressure relief valve and a manual pressure relief valve, and is equipped with a water pressure sensor.

[0035] When a certain sealer 4 needs to be opened, the controller 3 controls the electromagnetic pneumatic valve 22 corresponding to the sealer 4, and the high-pressure gas enters the corresponding pneumatic ball valve 21 to open it. The high-pressure water in the water supply pipe 15 enters the sealer 4 through the pneumatic ball valve 21 to realize the work.

[0036] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved through or by adopting existing technologies, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. An automatic control system for hydraulic fracturing coal, characterized by: The invention comprises a water pressure system (1) and a pneumatic control valve system (2), wherein the water pressure system (1) comprises a water supply pipe (15) and a water supply box (11), a water injection pump (13) and a high-pressure pump (14) which are arranged on the water supply pipe (15) in sequence, and the pneumatic control valve system (2) comprises a pneumatic ball valve (21), an electromagnetic pneumatic valve (22) and an air supply pipe (23) which is connected to a high-pressure air source, wherein the inlet of the electromagnetic pneumatic valve (22) is connected to the air supply pipe (23), the outlet of the electromagnetic pneumatic valve (22) is connected to the control port of the pneumatic ball valve (21), the outlet of the pneumatic ball valve (21) is connected to a hole sealer (4), and the inlet of the pneumatic ball valve (21) is connected to the water supply pipe (15).

2. The automatic control system for hydraulic fracturing coal according to claim 1, characterized in that: An overflow valve (17) is installed on the water supply pipe (15) at the outlet of the high-pressure pump (14).

3. The automatic control system for hydraulic fracturing coal according to claim 1, characterized in that: A water return pipe (19) is connected to the water supply pipe (15) at the outlet of the high-pressure pump (14), and a manual pressure relief valve is installed on the water return pipe (19).

4. The automatic control system for hydraulic fracturing coal according to claim 1, characterized in that: The water supply pipes (15) at the inlet and outlet of the high-pressure pump (14) are both equipped with check valves.

5. The automatic control system for hydraulic fracturing coal according to claim 1, characterized in that: The pneumatic control valve system (2) comprises a plurality of pneumatic ball valves (21) and a plurality of electromagnetic pneumatic valves (22).

6. The automatic control system for hydraulic fracturing coal according to claim 1, characterized in that: The air supply pipe (23) is provided with a manual air valve (24).

7. The automatic control system for hydraulic fracturing coal according to claim 1, characterized in that: The air supply pipe (23) is provided with a pneumatic triplet (25).

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