High-pressure water jet cutting coal breaking simulation system and method in different loaded states

Abstract

The invention relates to the technical field of coal mine hydraulics, in particular to a high-pressure water jet cutting coal breaking simulation system and method in different loaded states, and the system comprises a high-pressure pump set, a high-pressure pipeline, a cutting console, a nozzle, a simulation pressurization system and a coal cinder metering device; the simulation pressurization system is used for placing a test piece and loading pressure, and the coal slag metering device is arranged on one side of the cutting console or the simulation pressurization system and used for metering the slag production amount and the slag production speed in the slotting process; through a high-pressure pump set, a high-pressure pipeline, a cutting console, a nozzle and a simulation pressurization system, the real-time slag production amount and the slag production speed under different loading conditions, coal sample hardness, jet parameters and other factors are tested. According to the scheme, the real-time slag production amount and the slag production speed under different loading conditions, coal sample hardness, jet parameters and other factors can be tested, and a basis is provided for slotting jet parameter selection under different coal seam occurrence conditions.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine hydraulics, and in particular to a high-pressure water jet cutting and coal breaking simulation system and method under different load conditions. Background Art

[0002] As my country's coal mining extends deeper at a rate of 10 to 25 meters per year, the problems of high gas pressure, high gas content, high ground stress and low permeability have gradually become prominent. As a coal body pressure relief and permeability enhancement technology for managing deep high-gas coal seams, high-pressure water jet cutting and breaking technology has significantly enhanced the pressure relief and permeability enhancement effect, and the cutting process is safe. It has gradually become an important measure and development direction for intra-layer pressure relief and permeability enhancement.

[0003] During the implementation of high-pressure water jet cutting and coal breaking technology, the coal body around the borehole is destroyed by the high-pressure water jet to produce coal slag and form seams. The seams are deformed under the stress of the coal body, and the deformed coal body continues to form coal slag under the action of the water jet, resulting in the amount of slag produced by the cutting being greater than the theoretically calculated slag production based on the seam shape. However, under different coal seam occurrence conditions, the degree of seam deformation is different, and the overall slag production during the cutting process is too large and difficult to predict, resulting in frequent problems such as hole blocking and drill bit sticking during the cutting process.

[0004] Therefore, there is an urgent need for a high-pressure water jet cutting and coal breaking simulation system and method under different load conditions, which can test the real-time slag production and slag production speed under different load conditions, coal sample hardness, jet parameters and other factors, and provide a basis for the selection of cutting jet parameters under different coal seam occurrence conditions. Summary of the invention

[0005] One of the purposes of the present invention is to provide a high-pressure water jet cutting and coal breaking simulation system under different load conditions, which can test the real-time slag production and slag production speed under different load conditions, coal sample hardness, jet parameters and other factors, and provide a basis for the selection of cutting jet parameters under different coal seam occurrence conditions.

[0006] Basic solution 1 provided by the present invention: a high-pressure water jet cutting and breaking coal simulation system under different load conditions, comprising: a high-pressure pump group, a high-pressure pipeline, a cutting console, a nozzle, a simulation pressurization system, and a coal slag metering device;

[0007] The high-pressure pump group, cutting console and simulated pressurization system are connected through high-pressure pipelines;

[0008] The slag metering device is set on one side of the simulated pressurization system to measure the slag production amount and slag production speed during the cutting process;

[0009] A screw-in device is provided on the cutting console; the screw-in device has a screw-in motor;

[0010] Simulated pressurization system, used to place test specimens and load pressure;

[0011] The high-pressure pump group is connected to the nozzle through a high-pressure pipeline. The nozzle sprays high-pressure water jets on the cutting console or the simulated pressurization system to simulate the slag production process of high-pressure water jet cutting of coal body in unloaded and loaded states, and the slag metering device monitors the slag amount in real time;

[0012] The high-pressure pump group includes: a high-pressure clean water pump; the high-pressure clean water pump is used to control the injection and shutdown of the high-pressure water jet;

[0013] High-pressure pipeline, including high-pressure water pipe, high-pressure rotary water tail and high-pressure drill pipe connected in sequence;

[0014] The high-pressure water pipe is also connected to the high-pressure clean water pump, and the screw-in device is connected to the high-pressure drill rod, and the screw-in device drives the high-pressure drill rod to rotate;

[0015] The nozzle comprises: a drill bit and a slotting device; the drill bit is connected with a high-pressure drill rod; the slotting device is used for slotting.

[0016] Furthermore, the high-pressure pump group further includes: a motor;

[0017] The high-pressure clean water pump is arranged at the water supply source, and the motor is connected with the high-pressure clean water pump.

[0018] Further, the simulated pressurization system includes: a bottom pressurization device and a top pressurization device;

[0019] The bottom pressure device is used to place the briquette sample as the test specimen, and clamp the test specimen together with the top pressure device and apply pressure to the test specimen.

[0020] Further, the coal slag metering device comprises: a collection pipeline, an open channel flow meter, a coal slag transfer device and a coal slag metering device;

[0021] The collecting pipe is arranged below the first placing table or below the bottom pressurizing device to collect water and coal slag in the cutting process, and an open channel flow meter is arranged on the collecting pipe to perform flow detection;

[0022] All water and coal slag are collected at the outlet of the collection pipeline, transferred by a coal slag transfer device, and measured by a coal slag metering device.

[0023] Furthermore, the simulated pressurization system is provided with a protective cover on the outside.

[0024] Beneficial effects of basic scheme 1: Through the high-pressure water jet cutting and breaking coal simulation system under different load conditions provided by this scheme, the real-time slag production amount and slag production speed under different load conditions, coal sample hardness, jet parameters and other factors can be tested;

[0025] Specifically, the simulated pressurization system is used to place the test specimen and load the pressure; the test specimen is placed in the simulated pressurization system, and a slag metering device is placed correspondingly to measure the slag production amount and slag production speed during the cutting process;

[0026] The high-pressure pump group, high-pressure pipeline and nozzle cooperate. The high-pressure pump group is connected to the nozzle through the high-pressure pipeline. The nozzle sprays high-pressure water jets on the cutting console or the simulated pressurization system to simulate the slag production process of high-pressure water jet cutting coal body in non-loaded and loaded states. The slag metering device monitors the amount of slag in real time. In a different place, the high-pressure clean water pump and the motor are turned on, and the drill bit is screwed into the cutting position through the screw-in device and the rotating rod. The slitter performs a hydraulic slitting test on the briquette sample, and the slag metering device measures the slag production and slag production speed during the slitting process.

[0027] The load conditions can be adjusted by simulating the pressurization system, and the coal sample hardness can be adjusted by replacing test specimens with different coal sample hardness. The jet parameters can be adjusted by the high-pressure pump group to complete the test of the real-time slag production and slag production speed under different load conditions, coal sample hardness, jet parameters and other factors, so as to obtain the slag production law of high-pressure water jet cutting and breaking coal, and provide a basis for the selection of cutting jet parameters under different coal seam occurrence conditions.

[0028] The second purpose of the present invention is to provide a simulation method for high-pressure water jet cutting and coal breaking under different load conditions, which can test the real-time slag production and slag production speed under different load conditions, coal sample hardness, jet parameters and other factors, so as to obtain the slag production law of high-pressure water jet cutting and coal breaking, and provide a basis for the selection of cutting jet parameters under different coal seam occurrence conditions.

[0029] The present invention provides a second basic solution: a method for simulating high-pressure water jet cutting and coal breaking under different load states, using the above-mentioned high-pressure water jet cutting and coal breaking simulation system under different load states, including the following contents:

[0030] S1. Prepare several coal samples with drill holes as test specimens; and flush the holes of the coal samples to ensure that there are no foreign objects in the holes;

[0031] S2. Assemble the high-pressure water jet cutting and coal breaking simulation system under different load conditions;

[0032] S3, placing the briquette sample on the bottom pressure device, adjusting the pressure of the bottom pressure device and the top pressure device to clamp the briquette sample without loading;

[0033] S4. Fill the clean water tank with water, connect the water supply pipeline and power supply system, and adjust the jet parameters;

[0034] S5. Turn on the high-pressure clean water pump and the motor, and screw the drill bit into the cutting position through the screw-in device and the rotating rod. The cutter performs a hydraulic cutting test on the briquette sample, and the slag metering device measures the slag production and slag production speed during the cutting process.

[0035] S6. After one cut is completed, the high-pressure clean water pump is pumped back to zero, and the drill is withdrawn through the screw-in device and the rotating rod, and the pressure of the bottom pressure device and the top pressure device on the briquette sample is adjusted;

[0036] S7. The drill bit is screwed in to the same cutting position through the screwing device and the rotating rod. The cutter loads the briquette sample and performs a hydraulic cutting test. The slag metering device measures the slag production and slag production speed during the cutting process.

[0037] Furthermore, the S2 includes: connecting a high-pressure clean water pump, a high-pressure rotary water tail, a high-pressure drill pipe, a screwing device, a slotting device and a drill bit in sequence.

[0038] Beneficial effects of Basic Scheme 2: This scheme adopts a high-pressure water jet cutting and coal breaking simulation system under different load conditions. Through the above steps, the real-time slag production and slag production speed under different load conditions, coal sample hardness, jet parameters and other factors are tested to obtain the slag production law of high-pressure water jet cutting and coal breaking, and provide a basis for the selection of cutting jet parameters under different coal seam occurrence conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of an embodiment of a high-pressure water jet cutting and coal breaking simulation system under different load states of the present invention. DETAILED DESCRIPTION

[0040] The following is further described in detail through specific implementation methods:

[0041] The reference numerals in the drawings of the specification include: a high-pressure pump unit 1, a high-pressure pipeline 2, a cutting console 3, a nozzle 4, a simulated pressurization system 5, a test specimen 6, a coal ash metering device 7, and a screw-in device 8.

[0042] The embodiment is basically as shown in the attached Figure 1 As shown: a high-pressure water jet cutting and breaking coal simulation system under different loading conditions, used to test the real-time slag production amount and slag production speed under different loading conditions, factors such as coal sample hardness and jet parameters, including: a high-pressure pump group 1, a high-pressure pipeline 2, a cutting console 3, a nozzle 4, a simulation pressurization system 5, a test specimen 6, and a coal slag metering device 7;

[0043] The high-pressure pump group 1, the cutting console 3 and the simulated pressurization system 5 are connected through the high-pressure pipeline 2;

[0044] The coal slag metering device 7 is arranged on one side of the simulated pressurizing system 5; and the coal slag metering device 7 is movable;

[0045] The high-pressure pump group 1 is connected to the nozzle 4 through the high-pressure pipeline 2. The nozzle 4 sprays a high-pressure water jet on the cutting console 3 or the simulation pressurization system 5 to simulate the slag production process of high-pressure water jet cutting of coal body in the unloaded state and the loaded state, and the slag metering device 7 monitors the slag amount in real time;

[0046] The high-pressure pump group 1 includes: a high-pressure clean water pump and a motor; the high-pressure clean water pump is used to control the injection and shutoff of the high-pressure water jet;

[0047] The high-pressure clean water pump is arranged at the water supply source, and the motor is connected to the high-pressure clean water pump; specifically, the motor is connected to the pump shaft of the high-pressure clean water pump through a coupling, the pump shaft of the high-pressure clean water pump is connected to the impeller, and the motor drives the impeller to rotate, so that the high-pressure clean water pump works normally; in this embodiment, the water supply source adopts a clean water tank;

[0048] High-pressure pipeline 2, including: high-pressure water pipe, high-pressure rotary water tail, high-pressure drill pipe;

[0049] One end of the high-pressure water pipe is connected to a high-pressure clean water pump arranged at a water supply source, and the other end is rotatably connected to one end of a high-pressure rotating water tail, and the other end of the high-pressure rotating water tail is connected to one end of a high-pressure drill pipe; the other end of the high-pressure drill pipe is connected to a nozzle 4, specifically, the nozzle 4 includes: a drill bit and a slotter; the other end of the high-pressure drill pipe is connected to the drill bit; the other end of the drill bit is connected to the slotter, and the slotter is used for slotting; specifically, the high-pressure clean water pump adds water from the water supply source through the high-pressure water pipe, the high-pressure drill pipe, and the drill bit, and is sprayed out by the slotter to perform slotting, and during the screwing-in process of the high-pressure drill pipe, if the rod length of the high-pressure drill pipe cannot meet the screwing-in length, the high-pressure rotating water tail can be disassembled and a new high-pressure drill pipe can be connected.

[0050] The cutting console 3 is provided with a screw-in device 8; the screw-in device 8 has a screw-in motor;

[0051] The screwing device 8 is connected to the high-pressure drill rod, and the high-pressure drill rod is driven to rotate by the screwing motor;

[0052] A simulated pressurizing system 5 is used to place a test specimen 6 and load pressure;

[0053] It includes: a bottom pressurizing device and a top pressurizing device;

[0054] The bottom pressurizing device is used to place the briquette sample as the test specimen 6, and clamp the test specimen 6 together with the top pressurizing device, and apply pressure to the test specimen 6;

[0055] The simulated pressurization system 5 is provided with a protective cover on the outside to prevent the water from being sprayed into the external environment after the test specimen 6 is cut;

[0056] In other embodiments, a peripheral pressure device may be provided to pressurize the side of the test specimen 6, so as to more accurately simulate the pressure in the actual coal mine environment; a slag metering device 7, used to measure the slag production amount and slag production speed during the cutting process, including: a collection pipeline, an open channel flowmeter, a slag transfer device and a slag metering device 7;

[0057] The collecting pipe is arranged below the first placing table or below the bottom pressurizing device to collect water and coal slag in the cutting process, and an open channel flow meter is arranged on the collecting pipe to perform flow detection;

[0058] All water and coal slag are collected at the outlet of the collection pipeline, and are transferred by a coal slag transfer device, and the coal slag metering device 7 is used to meter the coal slag.

[0059] A method for simulating high-pressure water jet cutting and breaking coal under different loading conditions, using the above-mentioned high-pressure water jet cutting and breaking coal simulation system under different loading conditions, includes the following contents:

[0060] S1. Prepare several shaped coal samples with drilled holes as test specimens 6; and flush the holes of the coal samples to ensure that there are no foreign objects in the holes; in this embodiment, the size of the coal sample is 1.5×0.8×0.8m, and the hole is a cylindrical hole with an inner hole of R=119mm;

[0061] S2. Assemble a high-pressure water jet cutting and coal breaking simulation system under different load conditions; specifically, connect a high-pressure clean water pump, a high-pressure rotary water tail, a high-pressure drill pipe, a screwing device 8, a drill bit and a slotting device in sequence;

[0062] S3, placing the briquette sample on the bottom pressure device, adjusting the bottom pressure device and the top pressure device to clamp the briquette sample, without loading the pressure, aligning the drill hole with the high-pressure pipeline 2, and setting the coal ash metering device 7 on one side of the simulated pressure device;

[0063] S4. Fill the clean water tank with water, connect the water supply pipeline and power supply system, and adjust the jet parameters;

[0064] S5, turn on the high-pressure clean water pump and the motor, and screw the drill bit into the cutting position through the screwing device 8 and the rotating rod, the cutting device performs a hydraulic cutting test on the briquette sample, and the slag metering device 7 measures the slag production and slag production speed during the cutting process;

[0065] S6. After one cut is completed, the high-pressure clean water pump is pumped back to zero, and the drill is withdrawn through the screw-in device 8 and the rotating rod, and the pressure of the bottom pressure device and the top pressure device on the briquette sample is adjusted;

[0066] S7. The drill bit is screwed in to the same cutting position through the screwing device 8 and the rotating rod. The cutter loads the briquette sample and performs a hydraulic cutting test. The slag metering device 7 measures the slag production and slag production speed during the cutting process.

[0067] Embodiment 2

[0068] This embodiment is basically the same as the above embodiment, except that: the simulation pressurization system 5 further includes: a detachable clamping member;

[0069] The detachable clamping part includes: a clamping hoop and a clamping plate;

[0070] The hoop embraces the bottom pressure device; the two sides of the hoop are fixedly connected with vertically arranged buckle plates, the buckle plates are provided with a plurality of buckles, and telescopic clips are provided at both ends of the clamping plate to be engaged with the buckles;

[0071] When there is no need for the top pressure device to press down and clamp the test specimen 6, the clamp can be installed on the bottom pressure device, and then the clamping plate can be clamped into a suitable buckle to clamp the test specimen 6 to simulate the non-pressurized situation, and then subsequent cutting can be performed. Compared with the top pressure device pressing down, it saves energy and does not need to accurately control the pressure of the top pressure device pressing down. In other embodiments, a robotic arm can also be used to clamp the test specimen 6.

[0072] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A high-pressure water jet cutting and coal breaking simulation system under different load conditions, characterized in that: include: High-pressure pump set, high-pressure pipeline, cutting console, nozzle, simulated pressurization system, coal slag metering device; The high-pressure pump group, cutting console and simulated pressurization system are connected through high-pressure pipelines; The slag metering device is set on one side of the simulated pressurization system to measure the slag production amount and slag production speed during the cutting process; A screw-in device is provided on the cutting console; the screw-in device has a screw-in motor; Simulated pressurization system, used to place test specimens and load pressure; The high-pressure pump group is connected to the nozzle through a high-pressure pipeline. The nozzle sprays high-pressure water jets on the cutting console or the simulated pressurization system to simulate the slag production process of high-pressure water jet cutting of coal body in unloaded and loaded states, and the slag metering device monitors the slag amount in real time; The high-pressure pump group includes: a high-pressure clean water pump; the high-pressure clean water pump is used to control the injection and shutdown of the high-pressure water jet; High-pressure pipeline, including high-pressure water pipe, high-pressure rotary water tail and high-pressure drill pipe connected in sequence; The high-pressure water pipe is also connected to the high-pressure clean water pump, and the screw-in device is connected to the high-pressure drill rod, and the screw-in device drives the high-pressure drill rod to rotate; The nozzle comprises: a drill bit and a slotting device; the drill bit is connected with a high-pressure drill rod; the slotting device is used for slotting.

2. The high-pressure water jet cutting and coal breaking simulation system under different load conditions according to claim 1 is characterized in that: The high-pressure pump group further includes: a motor; The high-pressure clean water pump is arranged at the water supply source, and the motor is connected with the high-pressure clean water pump.

3. The high-pressure water jet cutting and coal breaking simulation system under different load conditions according to claim 1 is characterized in that: The high-pressure pipeline also includes: a high-pressure rotating water tail and a rotating device.

4. The high-pressure water jet cutting and coal breaking simulation system under different load conditions according to claim 1 is characterized in that: The simulated pressurization system comprises: a bottom pressurization device and a top pressurization device; The bottom pressure device is used to place the briquette sample as the test specimen, and clamp the test specimen together with the top pressure device and apply pressure to the test specimen.

5. The high-pressure water jet cutting and coal breaking simulation system under different load conditions according to claim 1 is characterized in that: The coal slag metering device comprises: a collection pipeline, an open channel flow meter, a coal slag transfer device and a coal slag metering device; The collecting pipe is arranged below the first placing table or below the bottom pressurizing device to collect water and coal slag in the cutting process, and an open channel flow meter is arranged on the collecting pipe to perform flow detection; All water and coal slag are collected at the outlet of the collection pipeline, transferred by a coal slag transfer device, and measured by a coal slag metering device.

6. The high-pressure water jet cutting and coal breaking simulation system under different load conditions according to claim 1 is characterized by: The simulated pressurization system is provided with a protective cover on the outside.

7. A method for simulating high-pressure water jet cutting and breaking coal under different load conditions, characterized in that: A high-pressure water jet cutting and coal breaking simulation system under different load conditions using any one of claims 1 to 6 above includes the following contents: S1. Prepare several coal samples with drill holes as test specimens; and flush the holes of the coal samples to ensure that there are no foreign objects in the holes; S2. Assemble the high-pressure water jet cutting and coal breaking simulation system under different load conditions; S3, placing the briquette sample on the bottom pressure device, adjusting the pressure of the bottom pressure device and the top pressure device to clamp the briquette sample without loading; S4. Fill the clean water tank with water, connect the water supply pipeline and power supply system, and adjust the jet parameters; S5. Turn on the high-pressure clean water pump and the motor, and screw the drill bit into the cutting position through the screw-in device and the rotating rod. The cutter performs a hydraulic cutting test on the briquette sample, and the slag metering device measures the slag production and slag production speed during the cutting process. S6. After one cut is completed, the high-pressure clean water pump is pumped back to zero, and the drill is withdrawn through the screw-in device and the rotating rod, and the pressure of the bottom pressure device and the top pressure device on the briquette sample is adjusted; S7. The drill bit is screwed in to the same cutting position through the screwing device and the rotating rod. The cutter loads the briquette sample and performs a hydraulic cutting test. The slag metering device measures the slag production and slag production speed during the cutting process.

8. The method for simulating high-pressure water jet cutting and breaking coal under different load conditions according to claim 7, characterized in that: The S2 comprises: a high-pressure clean water pump, a high-pressure rotary water tail, a high-pressure drill pipe, a screwing device, a drill bit and a slotting device connected in sequence.

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