Pneumatic driving coal water slurry lifting system and lifting method

Abstract

The application provides a kind of pneumatic drive coal water slurry lifting system and lifting method, its lifting system includes: coal water slurry storage pool, is located in well bottom;Ground coal slurry station;Coal water slurry conveying pipeline, one end is connected with coal water slurry storage pool, the other end is connected with ground coal slurry station;Gas lift device, multiple are arranged in the height direction of coal water slurry conveying pipeline, and be configured as to blow into compressed air in coal water slurry conveying pipeline;Coal slurry pump, for conveying coal water slurry in coal water slurry storage pool to coal water slurry conveying pipeline, and coal water slurry height at least overpasses the gas lift device of lowermost side;Control mechanism, be configured as when gas lift device corresponding coal water slurry conveying pipeline part is covered by coal water slurry, control compressed air blow into gas lift device.The application is injected into compressed air in coal water slurry conveying pipeline by multiple gas lift device, relies on the action of buoyancy and lifts coal water slurry along coal water slurry conveying pipeline, and energy consumption is less, device setting is simple, and energy saving is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mining, and particularly relates to a gas-driven coal water slurry lifting system and a lifting method. BACKGROUND

[0002] At present, underground mining is the main mining method of underground coal resources. After the underground coal layer is mined, it is transported to the bottom of the mine by a belt conveyor and other transportation equipment, and finally the coal is sent to the ground by the elevator. With the increase of mining depth, the energy and difficulty required to lift the coal blocks gradually increase, and the efficiency is low.

[0003] Some scholars have innovatively proposed the technical concept of deep coal fluidization mining, the core idea of which is to convert deep coal solid resources into gas, liquid or solid-liquid mixed state, and intelligently transport in the mine. On this basis, another scholar has proposed a method of lifting coal water slurry from the bottom of the earth by installing a multi-stage pump, but this method requires a large amount of energy, is not environmentally friendly, and will gradually become difficult as the mining depth increases. Therefore, it is urgent to propose an environmentally friendly and energy-saving coal water slurry lifting system. SUMMARY

[0004] In order to improve the problem of high energy consumption and environmental pollution of the current underground coal water slurry from the bottom of the earth, the present application provides a gas-driven coal water slurry lifting system and a lifting method.

[0005] The first aspect of the present application provides a gas-driven coal water slurry lifting system using the following technical solution:

[0006] A gas-driven coal water slurry lifting system, comprising:

[0007] a coal water slurry storage pool arranged at the bottom of the well;

[0008] a ground coal slurry station arranged on the ground;

[0009] a coal water slurry conveying pipeline having one end connected to the coal water slurry storage pool and the other end connected to the ground coal slurry station;

[0010] a gas lift device arranged at intervals in the height direction of the coal water slurry conveying pipeline and configured to blow compressed air into the coal water slurry conveying pipeline;

[0011] a coal slurry pump for conveying coal water slurry in the coal water slurry storage pool to the coal water slurry conveying pipeline, and the height of the coal water slurry at least exceeds the lowermost gas lift device; and

[0012] a control mechanism configured to control the blowing of compressed air into the gas lift device when the gas lift device corresponds to the part of the coal water slurry conveying pipeline submerged by the coal water slurry.

[0013] Further, the gas lift device comprises:

[0014] A coal slurry annulus is sleeved on the outer periphery of the coal water slurry conveying pipeline and forms a sealed space between the outer periphery of the coal water slurry conveying pipeline and the coal slurry annulus, and the control mechanism controls the compressed air to be blown into the coal slurry annulus;

[0015] A gas lift valve is arranged to connect the sealed space and the coal water slurry conveying pipeline, and the gas lift valve is a one-way valve for allowing only the compressed gas to pass through and enter the coal water slurry conveying pipeline.

[0016] Further, the control mechanism comprises:

[0017] A compressed air conveying system is configured to blow the compressed air into the coal slurry annulus under control;

[0018] A sensor is arranged in the coal slurry annulus and used to monitor the water coal slurry level in the corresponding coal water slurry conveying pipeline;

[0019] A controller is electrically connected with the sensor and the compressed air conveying system and configured to control the compressed air conveying system to blow the compressed air into the coal slurry annulus when the sensor detects that the water coal slurry level in the coal water slurry conveying pipeline reaches a preset value.

[0020] Further, the compressed air conveying system comprises:

[0021] A gas compressor is arranged on the ground;

[0022] A gas conveying pipeline is connected with the gas compressor;

[0023] An electromagnetic valve is arranged with a piston slidingly arranged therein; the electromagnetic valve is provided with an air inlet and an air outlet, the gas conveying pipeline is connected with the air inlet; the electromagnetic valve is further connected with a first exhaust pipe and a second exhaust pipe, both of which are connected with the coal slurry annulus; when the electromagnetic valve is not powered, the piston blocks the air inlet and the first exhaust pipe, and when the electromagnetic valve is powered, the piston blocks the air outlet and the second exhaust pipe; and

[0024] A relay is electrically connected with the electromagnetic valve and the controller.

[0025] Further, the gas lift valve is arranged in the coal slurry annulus in multiple.

[0026] Further, the application further comprises:

[0027] A water storage pool is arranged on the ground and configured to convey clean water to the coal water slurry storage pool;

[0028] A clean water conveying pipeline is used to connect the water storage pool and the coal water slurry storage pool.

[0029] Further more, further comprising:

[0030] A pulverizing grinder is used to pulverize the mined coal into coal dust;

[0031] A conveyor belt is used to input the coal dust pulverized by the pulverizing grinder into the coal water slurry storage pool.

[0032] Further more, a plurality of the gas lift devices are arranged at intervals on the coal water slurry conveying pipeline.

[0033] The second aspect of the present application provides a gas-driven coal water slurry lifting method using the following technical solution:

[0034] A gas-driven coal water slurry lifting method based on the above-mentioned gas-driven coal water slurry lifting system, comprising the following steps:

[0035] Pumping the coal water slurry in the coal water slurry storage pool through the coal water slurry conveying pipeline to above the gas lift device;

[0036] The gas lift device blows compressed air into the coal water slurry conveying pipeline to lift the coal water slurry in the pipeline and make the coal water slurry overflow above another gas lift device in the upper layer;

[0037] The other gas lift device continues to blow compressed air into the coal water slurry conveying pipeline and lift the coal water slurry, and this cycle forms multi-stage lifting of the coal water slurry until the coal water slurry is conveyed to the ground coal slurry station.

[0038] In summary, the present application has the following at least one beneficial technical effect:

[0039] 1. When it is needed to lift the coal water slurry at the bottom of the well to the ground, the coal water slurry in the coal water slurry storage pool is first pumped to the part of the coal water slurry conveying pipeline corresponding to the lowermost gas lift device by the coal slurry pump, and then the control device controls the blowing of compressed air into the gas lift device, which can inject compressed air into the coal water slurry conveying pipeline to lift the coal water slurry above the gas lift device in the pipeline; when this part of the coal water slurry is lifted to above the gas lift device in the upper layer, the gas lift device in the upper layer continues to inject compressed air into the coal water slurry conveying pipeline, and this cycle can continuously mix compressed gas into the coal water slurry liquid, and rely on the action of buoyancy to lift the coal water slurry along the coal water slurry conveying pipeline until it is conveyed to the ground coal slurry station;

[0040] 2. Compared with the way of adopting multi-stage coal slurry pump in the traditional lifting mode, with the increase of mining depth, the difficulty of setting up the coal slurry pump and the required energy consumption will increase, and the way of the application does not rely on electric energy, but relies on the buoyancy of gas to lift the water coal slurry in the water coal slurry conveying pipeline, which requires less energy consumption, the device is simple to set up, and the energy saving is better;

[0041] 3. By setting the crushing mill and the water storage pool, the coal mined from the ground can be crushed and ground into coal dust, and then mixed with clean water to form water coal slurry, which can be continuously conveyed to the ground coal slurry station through the water coal slurry conveying pipeline and the plurality of gas lifting devices, so as to realize the energy-saving lifting conveying of the mined coal. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0043] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application;

[0044] Figure 2 is a schematic diagram of the embodiment of the present application mainly used to show the gas lifting device.

[0045] Reference signs: 1, crushing mill; 2, coal slurry pump; 3, gas lifting device; 4, ground coal slurry station; 5, gas compressor; 6, water storage pool; 7, clean water conveying pipeline; 8, gas conveying pipeline; 9, water coal slurry conveying pipeline; 10, electromagnetic valve; 11, water coal slurry storage pool; 12, conveying belt; 13, gas lifting valve; 14, coal slurry annulus; 15, sensor; 16, controller; 17, relay; 18, piston; 19, first exhaust pipe; 20, second exhaust pipe. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present application more clear, the technical solutions in the present application will be described clearly and completely in the following combined with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0047] With reference to Figure 1 and Figure 2 , the embodiment of the present application discloses a gas-driven water coal slurry lifting system, which comprises:

[0048] A water-coal slurry storage pool 11 is arranged at the bottom of the well for temporarily storing water-coal slurry;

[0049] A ground coal slurry station 4 is arranged on the ground;

[0050] A water-coal slurry conveying pipeline 9 is connected at one end to the water-coal slurry storage pool 11 and at the other end to the ground coal slurry station 4;

[0051] A plurality of gas lift devices 3 are arranged at intervals along the length of the water-coal slurry conveying pipeline 9 and are configured to inject compressed air into the water-coal slurry conveying pipeline 9, and the plurality of gas lift devices 3 are arranged at intervals on the water-coal slurry conveying pipeline 9;

[0052] A coal slurry pump 2 is used to convey water-coal slurry in the water-coal slurry storage pool 11 into the water-coal slurry conveying pipeline 9 and provide an initial flow rate, and the water-coal slurry height is at least above the lowermost gas lift device 3; and

[0053] A control mechanism is configured to control the injection of compressed air into the corresponding gas lift device 3 when the corresponding part of the water-coal slurry conveying pipeline 9 is covered by water-coal slurry, so as to lift the water-coal slurry above the gas lift device 3.

[0054] In this way, when it is necessary to lift the water-coal slurry at the bottom of the well to the ground, the coal slurry pump 2 can first be used to convey the water-coal slurry in the water-coal slurry storage pool 11 to the part of the water-coal slurry conveying pipeline 9 corresponding to the lowermost gas lift device 3, and then the control device controls the injection of compressed air into the gas lift device 3, which in turn injects compressed air into the water-coal slurry conveying pipeline 9, thereby lifting the water-coal slurry above the gas lift device 3; when this part of the water-coal slurry is lifted above the gas lift device 3 of the next layer, the gas lift device 3 of the next layer continues to inject compressed air into the water-coal slurry conveying pipeline 9, and this cycle continues, so that a continuous supply of compressed gas is mixed into the water-coal slurry liquid, and the water-coal slurry is lifted along the water-coal slurry conveying pipeline 9 by the action of buoyancy until it is conveyed to the ground coal slurry station 4.

[0055] Compared with the conventional lifting method using multiple coal slurry pumps 2, as the mining depth increases, the difficulty of setting up the coal slurry pump 2 and the energy consumption required will increase, while the present application does not rely on electrical energy but relies on the buoyancy of gas to lift the water-coal slurry in the water-coal slurry conveying pipeline 9, which requires less energy consumption and is simple to set up and has good energy saving performance.

[0056] In the above description, the gas lift device 3 comprises: Figure 1 and Figure 2 The gas lift device 3 comprises:

[0057] The coal slurry annular space 14 is sleeved on the outer periphery of the coal water slurry conveying pipeline 9, and forms a sealed space between the outer periphery of the coal water slurry conveying pipeline 9; the control mechanism controls the compressed air to be introduced into the coal slurry annular space 14;

[0058] The gas lift valve 13 is connected with the sealed space and the coal water slurry conveying pipeline 9, and the gas lift valve 13 is only used for the compressed gas to pass through and enter the coal water slurry conveying pipeline 9, and the gas lift valve 13 is provided with a plurality of gas lift valves 13 in the coal slurry annular space 14, and specifically, the gas lift valve 13 is a one-way valve.

[0059] The control mechanism comprises:

[0060] The compressed air conveying system is configured to be controlled to introduce the compressed air into the coal slurry annular space 14;

[0061] The sensor 15 is arranged in the coal slurry annular space 14 and is used for monitoring the water coal slurry liquid level in the corresponding coal water slurry conveying pipeline 9, and specifically can be a liquid level sensor, and the probe of the sensor 15 penetrates the pipe wall of the coal water slurry conveying pipeline 9 and extends into the pipe cavity;

[0062] The controller 16 is electrically connected with the sensor 15 and the compressed air conveying system, and is configured to control the compressed air conveying system to introduce the compressed air into the coal slurry annular space 14 when the sensor 15 detects that the water coal slurry liquid level in the coal water slurry conveying pipeline 9 reaches a preset value.

[0063] And, referring to Figure 1 And Figure 2 The compressed air conveying system comprises:

[0064] The gas compressor 5 is arranged on the ground;

[0065] The gas conveying pipeline 8 is connected with the gas compressor 5;

[0066] The electromagnetic valve 10 is provided with a piston 18 slidingly arranged therein; the electromagnetic valve 10 is provided with an air inlet and an air outlet, the gas conveying pipeline 8 is connected with the air inlet; the electromagnetic valve 10 is further connected with a first exhaust pipe 19 and a second exhaust pipe 20, both of which are connected with the coal slurry annular space 14; the piston 18 blocks the air inlet and the first exhaust pipe 19 when the electromagnetic valve 10 is not electrified, and the piston 18 blocks the air outlet and the second exhaust pipe 20 when the electromagnetic valve 10 is electrified; and

[0067] The relay 17 is electrically connected with the electromagnetic valve 10 and is electrically connected with the controller 16.

[0068] Therefore, when the coal water slurry is lifted in the coal water slurry conveying pipeline 9, the sensor 15 detects the corresponding coal water slurry liquid level in the coal water slurry conveying pipeline 9 in the coal water slurry annulus 14, when reaching the set liquid level, the controller 16 controls the relay 17 to energize the electromagnetic valve 10, the piston 18 in the electromagnetic valve 10 moves downward to block the gas outlet and the second exhaust pipe 20, at the same time, the gas inlet is communicated with the first exhaust pipe 19, the compressed air generated by the gas compressor 5 enters the coal water slurry annulus 14 through the gas conveying pipeline 8, the gas inlet and the first exhaust pipe 19, and then enters the coal water slurry conveying pipeline 9 through the plurality of gas lift valves 13, so that the gas lift device 3 can automatically inject compressed gas into the coal water slurry conveying pipeline 9. When the coal water slurry liquid level in the coal water slurry conveying pipeline 9 does not reach the set liquid level, the electromagnetic valve 10 is not energized, the piston 18 blocks the gas inlet and the first exhaust pipe 19, at this time, the coal water slurry annulus 14 is connected with the atmosphere.

[0069] In addition, with reference to Figure 1 and Figure 2 the lifting system of the present application further comprises:

[0070] a water storage pool 6 arranged on the ground and configured to convey clean water to the coal water slurry storage pool 11;

[0071] a clean water conveying pipeline 7 for connecting the water storage pool 6 and the coal water slurry storage pool 11;

[0072] a crushing and grinding machine 1 for crushing and grinding the mined coal into coal dust;

[0073] a conveyor belt 12 for inputting the coal dust crushed and ground by the crushing and grinding machine 1 into the coal water slurry storage pool 11.

[0074] Therefore, the mined coal can be crushed and ground into coal dust, and then mixed with clean water to form coal water slurry, which can be continuously conveyed to the ground coal slurry station 4 through the coal water slurry conveying pipeline 9 and the plurality of gas lift devices 3, so as to realize the energy-saving and lifting conveying of the mined coal.

[0075] The implementation principle of the gas-driven coal water slurry lifting system according to the embodiment of the present application is as follows:

[0076] The water-coal slurry in the water-coal slurry storage pool 11 is pumped to the position corresponding to the lowermost gas lift device 3 by the coal slurry pump 2, and then the control device controls the compressed air to be injected into the gas lift device 3, which in turn injects the compressed air into the water-coal slurry conveying pipeline 9, so as to lift the water-coal slurry above the gas lift device 3; when the water-coal slurry is lifted to the position above the upper gas lift device 3, the upper gas lift device 3 continues to inject the compressed air into the water-coal slurry conveying pipeline 9, and the cycle is repeated, so that the continuous compressed air is mixed into the water-coal slurry liquid, and the water-coal slurry is lifted along the water-coal slurry conveying pipeline 9 by the action of the buoyancy until it is conveyed to the ground coal slurry station 4.

[0077] Compared with the conventional lifting mode using multiple coal slurry pumps 2, as the mining depth increases, the difficulty of setting the coal slurry pump 2 and the required energy consumption will increase, while the present application does not rely on electric energy, but relies on the buoyancy of the gas to lift the water-coal slurry in the water-coal slurry conveying pipeline 9, which requires less energy consumption, and the device is simple to set up and has good energy saving performance.

[0078] The present application also discloses a kind of gas drive water-coal slurry lifting method, based on a kind of gas drive water-coal slurry lifting system as above, referring to Figure 1 And Figure 2 , comprising the following steps:

[0079] The water-coal slurry in the water-coal slurry storage pool 11 is pumped to the position above the gas lift device 3 by the water-coal slurry conveying pipeline 9;

[0080] The gas lift device 3 injects compressed air into the water-coal slurry conveying pipeline 9 to lift the water-coal slurry in the water-coal slurry conveying pipeline 9, and the water-coal slurry is above the upper another gas lift device 3;

[0081] The another gas lift device 3 continues to inject compressed air into the water-coal slurry conveying pipeline 9 and lift the water-coal slurry, and the cycle is repeated to form multi-stage lifting of the water-coal slurry until the water-coal slurry is conveyed to the ground coal slurry station 4. This method does not rely on electric energy, but relies on the buoyancy of the gas to lift the water-coal slurry in the water-coal slurry conveying pipeline 9, which requires less energy consumption, and the device is simple to set up and has good energy saving performance.

[0082] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A system for pneumatically driving coal water slurry, characterized by, The application relates to a coal water slurry conveying system. The application comprises: a coal water slurry storage pool arranged at the bottom of a well; a coal water slurry station arranged on the ground; a coal water slurry conveying pipeline, one end of which is connected to the coal water slurry storage pool and the other end of which is connected to the coal water slurry station; a plurality of gas lift devices arranged at intervals in the height direction of the coal water slurry conveying pipeline and configured to blow compressed air into the coal water slurry conveying pipeline; a coal water slurry pump for conveying coal water slurry in the coal water slurry storage pool into the coal water slurry conveying pipeline, and the height of the coal water slurry is at least above the lowest gas lift device; and a control mechanism configured to control the blowing of compressed air into the gas lift device when the corresponding part of the coal water slurry conveying pipeline is covered by coal water slurry. The gas lift device comprises: a coal water slurry sleeve annulus arranged on the outer periphery of the coal water slurry conveying pipeline to form a sealed space between the coal water slurry conveying pipeline and the coal water slurry sleeve annulus, and the control mechanism controls the blowing of compressed air into the coal water slurry sleeve annulus; a gas lift valve for connecting the sealed space and the coal water slurry conveying pipeline, and the gas lift valve is a one-way valve for allowing only compressed gas to pass through and enter the coal water slurry conveying pipeline; The control mechanism comprises: a compressed air conveying system configured to blow compressed air into the coal water slurry sleeve annulus under control; a sensor arranged in the coal water slurry sleeve annulus and used for monitoring the liquid level of coal water slurry in the corresponding coal water slurry conveying pipeline; and a controller electrically connected with the sensor and the compressed air conveying system and configured to control the blowing of compressed air into the coal water slurry sleeve annulus by the compressed air conveying system when the sensor detects that the liquid level of coal water slurry in the coal water slurry conveying pipeline reaches a preset value. The compressed air conveying system comprises: a gas compressor arranged on the ground; a gas conveying pipeline connected with the gas compressor; a solenoid valve with a piston slidingly arranged therein, an air inlet and an air outlet arranged on the solenoid valve, the gas conveying pipeline being connected with the air inlet, the solenoid valve being further connected with a first exhaust pipe and a second exhaust pipe, both of which are connected with the coal water slurry sleeve annulus, the piston blocking the air inlet and the first exhaust pipe when the solenoid valve is not powered, and the piston blocking the air outlet and the second exhaust pipe when the solenoid valve is powered; and 2. A system for pneumatically pumping coal water slurry as claimed in claim 1 wherein, a relay electrically connected with the solenoid valve and the controller.

3. A system for pneumatically pumping coal water slurry as claimed in claim 1 wherein, A plurality of gas lift valves are arranged in the coal water slurry sleeve annulus. The application further comprises: a water storage pool arranged on the ground and configured to convey clean water to the coal water slurry storage pool; 4. A system for pneumatically pumping coal water slurry as claimed in claim 3 wherein, a clean water conveying pipeline for connecting the water storage pool and the coal water slurry storage pool. The application further comprises: a crushing and grinding machine for crushing and grinding mined coal into coal dust; 5. A system for pumping coal water slurry by gas pressure as claimed in claim 1 wherein, a conveyor belt for inputting the coal dust crushed and ground by the crushing and grinding machine into the coal water slurry storage pool. A plurality of gas lift devices are arranged at equal intervals on the coal water slurry conveying pipeline.

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