A coal bed methane pipeline liquid discharge device and an operating method thereof

Abstract

The present application belongs to the field of coalbed methane exploitation and collection and transportation, and particularly relates to a coalbed methane pipeline liquid discharge device and an operating method thereof, aiming to solve the problem that the pipeline liquid discharge function cannot be realized when the pipeline pressure is too low or the liquid discharge pipe is blocked in the prior art. The present application comprises a condensate cylinder, the top of the condensate cylinder is provided with a liquid discharge pipe insertion tube and a liquid level meter insertion tube, the inside of a Tesla air inlet pipe is a Tesla pipeline structure, an air outlet pipe is in communication with the condensate cylinder, a liquid level meter is in communication with the inner cavity of the condensate cylinder through the liquid level meter insertion tube, a liquid discharge assembly is in communication with the inner cavity of the condensate cylinder through the liquid discharge pipe insertion tube, when the liquid water accumulation in the condensate cylinder reaches the set upper limit value of the liquid discharge value, the liquid water can be discharged through the liquid discharge assembly, solving the problem that the pipeline liquid discharge function cannot be realized when the pipeline pressure is too low or the liquid discharge pipe is blocked, and compared with the prior art, the present application can run smoothly under the condition of low gas volume and low exhaust pressure.

Description

Technical Field

[0001] This invention belongs to the field of coalbed methane development, collection and transportation, and specifically relates to a coalbed methane pipeline drainage device and its operation method. Background Technology

[0002] During the coalbed methane pipeline gathering and transportation process, moisture in the coalbed methane will be released from the gas when pressure and temperature change, gradually forming liquid in the pipeline, which will reduce the pipeline's gas transmission efficiency and easily cause safety accidents such as freezing and blockage.

[0003] Patent application number 201721767614.8 discloses a pipe liquid discharge device that can capture tiny droplets by collision, thereby improving the liquid discharge effect by increasing the gas-liquid separation efficiency and separation effect.

[0004] Patent application number 202020427008.7 discloses a pipeline liquid discharge device. The device uses a level transmitter probe to detect the amount of liquid accumulated in the inner cavity of the condensate tank. Workers can use the level transmitter to know the amount of liquid in the inner cavity of the condensate tank, so as to arrive at the scene in time and discharge the liquid in the condensate tank by opening the first valve. This prevents the coalbed methane liquid entering the inner cavity of the condensate tank through the air inlet pipe from accumulating too much and flowing into the conveying pipeline through the air outlet pipe, causing the conveying pipeline to freeze and block.

[0005] Existing technologies mainly rely on the pressure difference between the inside and outside of the pipeline to discharge the liquid accumulated in the cylinder. When the pipeline pressure is too low or the drain pipe is blocked, the pipeline cannot perform the liquid discharge function, which affects the stability of the liquid discharge efficiency of the coalbed methane pipeline. Summary of the Invention

[0006] To address the problem in existing technologies where pipeline pressure is too low or the drain pipe is blocked, preventing the pipeline from draining, this invention provides a coalbed methane pipeline draining device, comprising:

[0007] The condensate tank has a sealed inner cavity with a mist eliminator inside. The top of the condensate tank is equipped with a drain pipe and a level gauge pipe.

[0008] The Tesla intake pipe has an internal Tesla pipe structure, with a pipe interface at one end and a hollow gland at the other end that is connected to the condensate cylinder.

[0009] The vent pipe is connected to the condensate cylinder;

[0010] The level gauge is connected to the inner cavity of the condensate tank via the level gauge tube;

[0011] The drain assembly is connected to the inner cavity of the condensate cylinder via a drain pipe.

[0012] When the amount of liquid water accumulated in the condensate tank reaches the upper limit of the set discharge value, the liquid water can be discharged through the discharge component.

[0013] According to some embodiments of this application, a coalbed methane pipeline drainage device is provided. The drainage component includes a drainage pipe, one end of which is connected to the inner cavity of the condensate cylinder through a drainage pipe insert, and the other end is provided with a drainage pump. A drainage pipe control valve and a drainage pump control valve are provided on the drainage pipe.

[0014] According to some embodiments of this application, a coalbed methane pipeline drainage device is provided, wherein the drainage assembly further includes a balance pipe, the balance pipe is connected to the drainage pipe, and the balance pipe is provided with a control valve, an electric three-way valve and an electric control valve.

[0015] According to some embodiments of this application, a coalbed methane pipeline drainage device further includes a power supply board, an automatic controller, and a transmission line. The power supply board is connected to the automatic controller and supplies power to the automatic controller. The automatic controller is connected to the drainage pump, the level gauge, the electric three-way valve, and the electric control valve respectively through the transmission line.

[0016] According to some embodiments of this application, a coalbed methane pipeline drainage device is provided, wherein the drainage pipe is provided with a drainage pipe control ball valve a and a drainage pipe explosion-proof sealing plate b.

[0017] According to some embodiments of this application, a coalbed methane pipeline drainage device is provided, wherein the level gauge insertion tube is provided with a level gauge insertion tube control ball valve a and a level gauge insertion tube explosion-proof sealing plate b.

[0018] On the other hand, some embodiments of this application also provide a method for draining liquid from a coalbed methane pipeline, specifically including the following steps:

[0019] S1. Connect the condensate cylinder in series to the coalbed methane pipeline, and use the Tesla intake pipe to accelerate the airflow to impact the mist eliminator plate to achieve gas-liquid separation.

[0020] S2. The liquid level in the condensate tank is monitored by the liquid level gauge, and the automatic controller controls the opening and closing of the electric three-way valve, the electric control valve and the drain pump according to the preset liquid level threshold.

[0021] S3. When the pressure difference is greater than or equal to the set threshold, the liquid is drained using the pressure difference; when the pressure difference is less than the set threshold, the drain pump is started to drain the liquid.

[0022] S4. When the drainage stops, the pressure is balanced by the balance pipe to ensure that the residual liquid in the drainage pipe flows back to the condensate tank.

[0023] According to some embodiments of this application, a method for draining liquid from a coalbed methane pipeline is provided. When the level gauge or drain pipe needs to be replaced, the draining operation is suspended and the drain pipe insertion control ball valve or the level gauge insertion control ball valve is closed. Operation is resumed after maintenance is completed.

[0024] The beneficial effects of this invention are:

[0025] Compared with existing technologies, this device can operate smoothly under low gas volume and low exhaust pressure conditions, with an applicable pressure of 0.01 MPa to 0.09 MPa.

[0026] By employing a condensate tank to collect accumulated liquid, powered by solar energy, and with a level gauge for sensing and a controller for automatic control, the system achieves automatic collection, sensing, and control of accumulated liquid in pipelines, thus improving the overall performance of pipeline drainage.

[0027] The condensate cylinder adopts a Tesla intake pipe and built-in mist eliminator design, which improves the gas-liquid separation effect of low-pressure airflow.

[0028] The plug-in drain pipe and plug-in level gauge feature a leak-proof and puncture-proof sealing design, which solves the problem of difficult equipment maintenance and cleaning.

[0029] The backup self-priming pump design solves the problem of insufficient pressure differential preventing the device from draining liquid from the pipeline. Attached Figure Description

[0030] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0031] Figure 1 This is a schematic diagram of the overall structure of some embodiments of this application;

[0032] Figure 2 This is a schematic diagram of the Tesla intake pipe structure according to some embodiments of this application.

[0033] In the diagram: 1. Condensate cylinder; 101. Tesla intake pipe; 102. Exhaust pipe; 103. Fog eliminator; 104. Condensate cylinder top cover; 105. Condensate cylinder bottom; 106. Condensate cylinder body; 107. Drain pipe insert; 107a. Drain pipe insert control ball valve; 107b. Drain pipe insert explosion-proof seal; 108. Level gauge insert; 108a. Level gauge insert control ball valve; 108b. Level gauge insert explosion-proof seal; 2. Drain pipe; 201. Drain pipe control valve; 202. Drain pump control valve; 3. Drain pump; 4. Level gauge; 5. Balance pipe; 501. Control valve; 502. Electric three-way valve; 503. Electric control valve; 6. Power supply board; 7. Automatic controller; 8. Transmission line. Detailed Implementation

[0034] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] like Figure 1-2 As shown, in one aspect, the present invention provides a coalbed methane pipeline drainage device, comprising:

[0037] The condensate tank 1 has a sealed inner cavity, in which a mist eliminator 103 is installed. The top of the condensate tank 1 is equipped with a drain pipe 107 and a level gauge 108.

[0038] Tesla intake pipe 101 has a Tesla pipe structure inside, with a pipe interface at one end and a hollow grate at the other end that is connected to condensate cylinder 1.

[0039] The vent pipe 102 is connected to the condensate cylinder 1;

[0040] The level gauge 4 is connected to the inner cavity of the condensate tank 1 through the level gauge insertion tube 108;

[0041] The drain assembly is connected to the inner cavity of the condensate tank 1 via the drain pipe 107;

[0042] When the amount of liquid water accumulated in the condensate tank 1 reaches the upper limit of the set discharge value, the liquid water can be discharged through the discharge component.

[0043] In specific implementation, the condensate cylinder 1 includes a condensate cylinder cover 104, a condensate cylinder bottom 105, a condensate cylinder body 106, a drain pipe 107, and a level gauge pipe 108. The drain pipe 107 and the level gauge pipe 108 are vertically positioned on the top of the condensate cylinder cover 104. A Tesla intake pipe 101 is located on one side, and an exhaust pipe 102 is located on the other side. The Tesla intake pipe 101 and the exhaust pipe 102 are spaced a certain distance from the bottom of the condensate cylinder bottom 105, giving the inner cavity of the condensate cylinder body 106 a certain liquid storage capacity. The interior of the Tesla intake pipe 101 is specially designed... The Tesla pipeline structure has a pipeline interface at one end and a hollow gland at the other end, which is fixed to the side wall of the condensate cylinder 106. The central hole of the hollow gland is directly opposite the mist eliminator 103 placed in the inner cavity of the condensate cylinder 1. Gas from the upstream pipeline of coalbed methane enters the Tesla inlet pipe 101 from the pipeline interface end. After acceleration, the gas enters the condensate cylinder 106 through the hollow gland end. The accelerated gas collides with the mist eliminator 103 in the inner cavity of the condensate cylinder 1 due to inertial collision, resulting in gas-liquid separation. The separated liquid water accumulates at the bottom 105 of the condensate cylinder, and the separated gas enters the downstream pipeline of coalbed methane through the gas outlet pipe 102.

[0044] The drain pump 3 is used to pump out the liquid water accumulated in the condensate tank 1 when the pressure difference between the inside and outside of the pipeline is insufficient. The level gauge 4 is inserted into the condensate tank 106 through the level gauge insertion tube 108. The explosion-proof sealing gland 108b of the level gauge insertion tube is used to seal the gap between the level gauge insertion tube 108 and the level gauge 4. The level gauge insertion tube control ball valve 108a is used to close the channel of the level gauge insertion tube 108 after the level gauge 4 is pulled out.

[0045] In some embodiments, the drain assembly includes a drain pipe 2, one end of which is connected to the inner cavity of the condensate cylinder 1 via a drain pipe insertion tube 107, and the other end is provided with a drain pump 3. A drain pipe control valve 201 and a drain pump control valve 202 are provided on the drain pipe 2.

[0046] In practice, the drain pipe 2 is inserted into the condensate cylinder 106 through the drain pipe insertion tube 107. The explosion-proof sealing gland 107b of the drain pipe insertion tube is used to seal the gap between the drain pipe insertion tube 107 and the drain pipe 2. The drain pipe insertion tube control ball valve 107a is used to close the drain pipe insertion tube 107 channel after the drain pipe 2 is pulled out.

[0047] In some embodiments, the drainage assembly further includes a balance pipe 5, which is connected to the drainage pipe 2, and the balance pipe 5 is provided with a control valve 501, an electric three-way valve 502, and an electric control valve 503.

[0048] In specific implementation, one end of the balance pipe 5 is fixed to the drain pipe insertion tube 107. When the control valve 501 is used to replace the electric three-way valve 502, it cuts off the channel between the balance pipe 5 and the electric three-way valve 502. The electric control valve 503 and the electric three-way valve 502 open or close synchronously, opening or closing the drain pipe channel to control the drainage. When the electric three-way valve 502 is open, the balance pipe 5 and the drain pipe 2 are connected, and the drain pipe 2 is connected to the electric control valve 503. The liquid water accumulated in the condensate tank 1 enters the drain pipe 2 from the bottom under the action of the pressure difference inside and outside the pipe, and is discharged through the electric three-way valve 502 and the electric control valve 503. When the electric three-way valve 502 is closed, the drain pipe 2 and the electric control valve 503 are cut off, and the balance pipe 5 and the drain pipe 2 are connected to achieve pressure balance, so that the residual liquid in the drain pipe 2 falls back into the inner cavity of the condensate tank 1, preventing the residual liquid from freezing and blocking the drain pipe.

[0049] In some embodiments, the system also includes a power supply board 6, an automatic controller 7, and a transmission line 8. The power supply board 6 is connected to the automatic controller 7 and supplies power to the automatic controller 7. The automatic controller 7 is connected to the drain pump 3, the level gauge 4, the electric three-way valve 502, and the electric control valve 503 respectively via the transmission line 8.

[0050] In practice, the power supply board 6 is used to convert solar energy into electrical energy to provide power to the automatic controller 7, level gauge 4, electric three-way valve 502, electric control valve 503 and drainage pump 3. The automatic controller 7 controls the level gauge 4, electric three-way valve 502, electric control valve 503 and drainage pump 3 to perform operations through the transmission line 8.

[0051] In some embodiments, the drain pipe insertion tube 107 is provided with a drain pipe insertion tube control ball valve 107a and a drain pipe insertion tube explosion-proof seal 107b, and the level gauge insertion tube 108 is provided with a level gauge insertion tube control ball valve 108a and a level gauge insertion tube explosion-proof seal 108b.

[0052] In practice,

[0053] On the other hand, in some embodiments, a method for draining liquid from a coalbed methane pipeline is also provided, specifically including the following steps:

[0054] S1. Connect the condensate cylinder 1 in series to the coalbed methane pipeline, and use the Tesla intake pipe 101 to accelerate the airflow to impact the mist eliminator 103 to achieve gas-liquid separation.

[0055] S2. The liquid level in the condensate tank 1 is monitored by the liquid level gauge 4, and the automatic controller 7 controls the opening and closing of the electric three-way valve 502, the electric control valve 503 and the drain pump 3 according to the preset liquid level threshold.

[0056] S3. When the pressure difference is greater than or equal to the set threshold, the liquid is discharged using the pressure difference; when the pressure difference is less than the set threshold, the liquid discharge pump 3 is started to discharge the liquid.

[0057] S4. When the drainage stops, the pressure is balanced through the balance pipe 5 to ensure that the residual liquid in the drainage pipe flows back to the condensate tank 1.

[0058] In some embodiments, the threshold value is set to 0.03 MPa. When the pressure difference between the inside and outside of the pipeline is greater than 0.03 MPa, the power supply board converts solar energy into electrical energy to provide power to the device. The automatic controller 7 sets the discharge value, and the level gauge 4 senses the amount of liquid water accumulated in the condensate tank 1. When the amount of liquid water accumulated in the condensate tank 1 reaches the upper limit of the discharge value set by the automatic controller 7, the electric three-way valve 502 and the electric control valve 503 open simultaneously. Under the action of the pressure difference between the inside and outside of the pipeline, the liquid water accumulated in the condensate tank 1 enters the discharge pipe from the bottom of the discharge pipe 2 and flows through the discharge pipe control valve 201, the electric three-way valve 502 and the electric control valve 503 to be discharged.

[0059] When the amount of liquid water accumulated in the condensate tank 1 reaches the lower limit of the discharge value set by the automatic controller 7, the electric three-way valve 502 and the electric control valve 503 close simultaneously to stop the discharge of liquid water in the condensate tank 1. At the same time, the balance pipe 5 is connected to the drain pipe 2 to achieve pressure balance, so that the residual liquid in the drain pipe 2 falls back into the inner cavity of the condensate tank 1 to prevent the residual liquid from freezing and blocking the drain pipe.

[0060] In some embodiments, when the pressure difference between the inside and outside of the pipeline is less than 0.03 MPa, the power supply board converts solar energy into electrical energy to provide power to the device. The automatic controller 7 sets the discharge value, and the level gauge 4 senses the amount of liquid water accumulated in the condensate tank 1. When the amount of liquid water accumulated in the condensate tank 1 reaches the upper limit of the discharge value set by the automatic controller 7, the discharge pump 3 is turned on. Under the suction action of the discharge pump 3, the liquid water accumulated in the condensate tank 1 enters the discharge pipe from the bottom of the discharge pipe 2, flows through the discharge pipe control valve 201 and the discharge pump control valve, and enters the discharge pump 3 for discharge. When the amount of liquid water accumulated in the condensate tank 1 reaches the lower limit of the discharge value set by the automatic controller 7, the discharge pump 3 is turned off, and the discharge of liquid water in the condensate tank 1 is stopped.

[0061] In some embodiments, when the level gauge 4 or the drain pipe 2 needs to be replaced, the draining operation is suspended and the drain pipe insertion control ball valve 107a or the level gauge insertion control ball valve 108a is closed, and operation is resumed after maintenance is completed.

[0062] In practice, when the level gauge 4 fails and cannot sense the amount of liquid water accumulating in the condensate tank 1, it can be replaced while continuously supplying gas. To replace, loosen the explosion-proof seal 108b of the level gauge insertion tube by rotating it, and pull the failed level gauge 4 out of the level gauge insertion tube 108. After the level gauge 4 is completely removed, close the level gauge insertion tube control ball valve 108a to cut off the passage of the level gauge insertion tube 108. After inserting the new level gauge 4 into the explosion-proof seal 108b of the level gauge insertion tube, open the level gauge insertion tube control ball valve 108a and insert the new level gauge 4 into the inner cavity of the condensate tank 1 through the level gauge insertion tube 108.

[0063] When drain pipe 2 is blocked and cannot drain, it can be replaced while continuously supplying gas. To replace, loosen the explosion-proof seal 107b of the drain pipe insert by rotating it, and pull the faulty drain pipe 2 out of the drain pipe insert 107. After drain pipe 2 is completely removed, close the drain pipe insert control ball valve 107a to cut off the drain pipe insert 107 channel. Insert the new drain pipe 2 into the explosion-proof seal 107b of the drain pipe insert, then open the drain pipe insert control ball valve 107a, and insert the new drain pipe 2 into the inner cavity of the condensate cylinder 1 through the drain pipe insert 107.

[0064] In the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0065] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0066] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0067] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A coalbed methane pipeline drainage device, characterized in that, include: The condensate tank has a sealed inner cavity with a mist eliminator inside. The top of the condensate tank is equipped with a drain pipe and a level gauge pipe. The Tesla intake pipe has an internal Tesla pipe structure, with a pipe interface at one end and a hollow gland at the other end that is connected to the condensate cylinder. The vent pipe is connected to the condensate cylinder; The level gauge is connected to the inner cavity of the condensate tank via the level gauge tube; The drain assembly is connected to the inner cavity of the condensate cylinder via a drain pipe. When the amount of liquid water accumulated in the condensate tank reaches the upper limit of the set discharge value, the liquid water can be discharged through the discharge component.

2. The coalbed methane pipeline drainage device according to claim 1, characterized in that, The drainage assembly includes a drainage pipe, one end of which is connected to the inner cavity of the condensate cylinder through a drainage pipe insert, and the other end is equipped with a drainage pump. The drainage pipe is equipped with a drainage pipe control valve and a drainage pump control valve.

3. A coalbed methane pipeline drainage device according to claim 2, characterized in that, The drainage assembly also includes a balance pipe, which is connected to the drainage pipe. The balance pipe is equipped with a control valve, an electric three-way valve, and an electric control valve.

4. A coalbed methane pipeline drainage device according to claim 3, characterized in that, It also includes a power supply board, an automatic controller, and a transmission line. The power supply board is connected to the automatic controller and supplies power to the automatic controller. The automatic controller is connected to the drain pump, the level gauge, the electric three-way valve, and the electric control valve respectively through the transmission line.

5. A coalbed methane pipeline drainage device according to claim 1, characterized in that, The drain pipe is equipped with a drain pipe control ball valve and a drain pipe explosion-proof sealing gland.

6. A coalbed methane pipeline drainage device according to claim 1, characterized in that, The level gauge tube is equipped with a level gauge tube control ball valve and a level gauge tube explosion-proof sealing gland.

7. A method for draining liquid from a coalbed methane pipeline, characterized in that, Specifically, the following steps are included: S1. Connect the condensate cylinder in series to the coalbed methane pipeline, and use the Tesla intake pipe to accelerate the airflow to impact the mist eliminator plate to achieve gas-liquid separation. S2. The liquid level in the condensate tank is monitored by the liquid level gauge, and the automatic controller controls the opening and closing of the electric three-way valve, the electric control valve and the drain pump according to the preset liquid level threshold. S3. When the pressure difference is greater than or equal to the set threshold, the liquid is drained using the pressure difference; when the pressure difference is less than the set threshold, the drain pump is started to drain the liquid. S4. When the drainage stops, the pressure is balanced by the balance pipe to ensure that the residual liquid in the drainage pipe flows back to the condensate tank.

8. A method for draining liquid from a coalbed methane pipeline according to claim 7, characterized in that, When the level gauge or drain pipe needs to be replaced, suspend the draining operation and close the drain pipe insertion control ball valve or the level gauge insertion control ball valve. Resume operation after maintenance is completed.

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