Mining gas extraction gas-water separation pipeline

Abstract

The utility model belongs to the field of mine gas treatment, and relates to a mine gas extraction gas-water separation pipeline, which comprises drill holes, a shunt pipe and a branch pipe, the drill holes are distributed in a coal seam, the shunt pipe is arranged in the bottom space of a roadway, and the branch pipe is arranged in the top space of the roadway; gas or / and water extracted by the drill hole enters the flow dividing pipe through a drill hole connecting pipe, one end of the flow dividing pipe is connected with a branch pipe, the other end of the flow dividing pipe is connected with a water discharging device, the end connected with the branch pipe is higher than the end of the water discharging device, and the flow dividing pipe forms a gradient of 0.3%-0.7% relative to a roadway bottom plate. Water in the flow dividing pipe downwards flows into the water discharging device along the slope; the other end of the branch pipe is connected with a gas extraction pump, and gas entering the flow dividing pipe is extracted away. According to the gas-water separation pipeline system for the mine gas pipeline, gas-water separation that gas flows to the high position and water flows to the ground of a gas extraction net is achieved, water-gas separation equipment does not need to be additionally arranged, and gas is extracted from a coal seam to achieve water-gas separation quickly.

Description

Technical Field

[0001] This utility model relates to the field of mine gas treatment, and in particular to a gas-water separation pipeline system for mine gas pipelines. Background Technology

[0002] The coal mines in Guizhou primarily exploit the Longtan Formation coal-bearing strata, which are weakly aquifers and heavily influenced by geological structures, exhibiting well-developed strike joints, dip joints, X-type joints, and structural joints. Fissure water is often present in the mined strata, leading to water accumulation in the boreholes after drilling. Since methane gas is a mixed gas, it condenses into water droplets upon cooling. In the methane drainage network, applying negative pressure to the drainage pumps causes the water in the boreholes to flow into the network. If drainage in the network is obstructed, it affects the gas extraction capacity and effectiveness. Furthermore, existing technologies suffer from problems such as unreasonable design, lack of planning, construction limitations, or material constraints, resulting in excessively long borehole-connecting drainage pipes, forming U-shaped water traps that affect the negative pressure and flow rate during borehole drainage; and the failure to achieve a positive slope in the borehole connection pipes also contributes to water accumulation.

[0003] Existing technologies disclose gas-water separation devices under negative pressure during gas extraction. For example, CN106761655A discloses a gas-water separation device under negative pressure, including a gas-water separation chamber, a gas-water isolation body, and a water storage chamber. However, it needs to be "integrated into the gas extraction pipeline network" and "connected to several boreholes," which takes up considerable space and is not suitable for use in Guizhou coal mines with complex geological structures. CN 202756008U discloses a gas-water separator pipeline for coal mine gas extraction, which includes a water ring vacuum pump and a gas-water separator. The outlet pipe of the water ring vacuum pump is connected to the inlet of the gas-water separator. A water funnel is installed directly below the packing water outlet pipe of the water ring vacuum pump, and the water funnel is connected to a water funnel outlet pipe. It also includes a pump body water outlet main pipe, and the discharge pipe of the water ring vacuum pump and the water funnel outlet pipe are both connected to the pump body water outlet main pipe. However, it did not disclose how it would be used in conjunction with the complex gas extraction pipeline network in coal mines. Even if it could be conceived, it would require the installation of an additional device. In that case, the gas and water would already be mixed in the extraction pipeline network, which would affect the gas extraction capacity and extraction effect. Therefore, the solution is not practical. Summary of the Invention

[0004] The purpose of this utility model is to provide a gas-water separation pipeline system for mining gas pipelines, which realizes gas-water separation by allowing gas to flow upwards and water to flow downwards in the gas extraction network. It eliminates the need for additional gas-water separation equipment, and gas-water separation can be achieved quickly when extracting gas from coal seams.

[0005] To solve the above-mentioned technical problems, the gas-water separation pipeline system for mine gas pipelines provided by this utility model is implemented as follows:

[0006] A mine gas extraction gas-water separation pipeline includes: a borehole, a diversion pipe, and a branch pipe. The borehole is distributed in the coal seam, the diversion pipe is arranged in the bottom space of the roadway, and the branch pipe is arranged in the top space of the roadway. The gas and / or water extracted by the borehole enters the diversion pipe through the borehole connecting pipe. One end of the diversion pipe is connected to the branch pipe, and the other end is connected to a water discharge device. The end connected to the branch pipe is higher than the end connected to the water discharge device. The diversion pipe forms a slope of 3‰ to 7‰ relative to the roadway floor. The water in the diversion pipe flows down the slope into the water discharge device. The other end of the branch pipe is connected to a gas extraction pump to remove the gas that has entered the diversion pipe.

[0007] Optionally, it also includes: a manifold, which is connected to a borehole connection pipe, through which the gas and / or water extracted from the borehole flows into the manifold and then into the branch pipe.

[0008] Optionally, the boreholes are distributed in columns in the cross-seam coal seam, with two or more columns of boreholes, and each column has two or more boreholes; every two columns of boreholes are connected to a manifold through a borehole connecting pipe, and the manifold has one or more pipes.

[0009] Optionally, the two or more columns of boreholes are arranged such that the corresponding rows of boreholes in each column are on a straight line.

[0010] Optionally, the borehole may be one or more rows in the coal seam.

[0011] Optionally, the borehole connecting pipe has a positive slope with a slope between 3‰ and 5‰.

[0012] Optionally, a gate valve is provided at one end of the branch pipe connecting to the diversion pipe.

[0013] Optionally, the branch pipe end of the diversion pipe is provided with an observation hole.

[0014] This utility model provides a gas-water separation pipeline for mine gas extraction. Gas and / or water extracted from boreholes enter the diversion pipe through a borehole connecting pipe. One end of the diversion pipe is connected to a branch pipe, and the other end is connected to a water discharge device. The branch pipe end is higher than the water discharge device end. The diversion pipe forms a slope of 3‰ to 7‰ relative to the roadway floor, allowing water in the diversion pipe to flow downhill into the water discharge device. The other end of the branch pipe is connected to a gas extraction pump, which removes the gas entering the diversion pipe. This completely achieves water-to-water and gas-to-gas separation, ensuring gas flows upwards and water flows downwards. Compared to existing technologies, no additional gas extraction equipment is required.

[0015] Based on the actual slope of the roadway, this utility model proposes to lay the diversion pipe at a slope of 3‰ to 7‰. The higher end of the diversion pipe is connected to the gas extraction branch pipe, and the lower end is equipped with a slag discharge and water discharge device to achieve gas and water separation.

[0016] This invention employs different borehole layouts and pipeline configurations based on the different coal seams, including those along and across the seam. For example, when drilling through a seam, multiple boreholes are equipped with confluence pipelines, while boreholes along the seam are arranged in rows to adapt to different gas distributions in the coal seam; the design is diverse. Furthermore, the row-and-column arrangement makes the borehole positions predictable, facilitating drilling rig positioning and operation for construction personnel. Construction personnel can perform drilling operations according to a predetermined sequence and method, simplifying the organization and management of the construction process, reducing construction difficulty, and increasing overall construction speed.

[0017] This utility model features a perforated connecting pipe with a forward slope. A forward slope means that in a gas extraction pipeline system, the perforated connecting pipe is laid in the same direction as the gas flow and has a certain gradient, between 3‰ and 5‰. This design achieves the following: 1. Facilitates drainage: Water in the pipeline flows under gravity along the slope to the drainage device or low-lying areas, preventing water accumulation and blockage that could affect gas extraction. 2. Promotes gas flow: The slope, aligned with the gas flow direction, provides assistance to gas flow, reducing resistance and improving extraction efficiency and flow rate, thus ensuring the stability and reliability of the extraction system. 3. Prevents gas backflow: A forward slope can prevent backflow of gas in the pipeline, ensuring that gas flows to the extraction equipment in the designed direction, improving the safety and effectiveness of extraction.

[0018] In this invention, an observation hole is provided at the end of the diversion pipe connected to the branch pipe, and the gate valve is closer to the branch pipe. The observation hole allows observation of the area of ​​the diversion pipe close to the branch pipe to see if there is water accumulation, making it convenient to adjust the slope of the diversion pipe in a timely manner. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the gas-water separation pipeline layout for gas extraction in in-seam mining, provided by the first embodiment of this utility model.

[0020] Figure 2 This is a second embodiment of the present invention, a schematic diagram of the gas-water separation pipeline layout for cross-layer mining;

[0021] Attached reference numerals: 1-borehole, 2-diversion pipe, 3-branch pipe, 4-borehole connection pipe, 5-water drainer, 6-gas extraction pump, 7-gate valve, 8-manifold, 9-observation hole, 10-roadway roof and 11-roadway floor. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] Example 1

[0024] like Figure 1 As shown, a mine gas extraction gas-water separation pipeline is arranged along the coal seam, including: a borehole 1, a diversion pipe 2, and a branch pipe 3. The borehole 1 is distributed in the coal seam, the diversion pipe 2 is arranged in the bottom space of the roadway, and the branch pipe 3 is arranged in the top space of the roadway. The gas and / or water extracted from the borehole 1 enters the diversion pipe 2 through the borehole connecting pipe 4. One end of the diversion pipe 2 is connected to the branch pipe 3, and the other end is connected to the water discharge device 5. The end connected to the branch pipe is higher than the end connected to the water discharge device. The diversion pipe 2 forms a slope of 3‰ to 7‰ relative to the roadway floor. The water in the diversion pipe 2 flows down the slope into the water discharge device 5. The other end of the branch pipe 3 is connected to a gas extraction pump 6, which extracts the gas that has entered the diversion pipe 2.

[0025] Figure 1 The direction of the middle arrow indicates the direction of gas flow, all flowing towards the gas extraction pump 6.

[0026] The number of boreholes is determined by the size of the coal seam cross-section, with one or more rows typically used.

[0027] The borehole connection pipe should have a positive slope, with a slope between 3‰ and 5‰. The length of the borehole connection pipe should not be too long, and should be set between 0.2 and 1 meter depending on the construction site. This is to prevent low-lying areas from accumulating water during later pumping operations.

[0028] A gate valve 7 is installed at one end of the branch pipe connecting to the diversion pipe. It is used to reasonably adjust the negative pressure of the extraction during the extraction process or to close the gate valve after the gas extraction is completed to prevent the gas from flowing back.

[0029] The branch pipe is connected to the diversion pipe and an observation hole 9 is provided. The gate valve is closer to the branch pipe. The observation hole 9 is used to detect the gas extraction parameters and adjust the extraction negative pressure in a timely manner.

[0030] Example 2

[0031] like Figure 2As shown, a gas extraction and water separation pipeline for mining is arranged along the coal seam, including: a borehole 1, a diversion pipe 2, and a branch pipe 3. The borehole 1 is distributed in the coal seam, the diversion pipe 2 is arranged in the bottom space of the roadway, and the branch pipe 3 is arranged in the top space of the roadway. The gas and / or water extracted from the borehole 1 flows through the borehole connecting pipe 4 to the confluence pipe 8, and then enters the diversion pipe 2 through the confluence pipe 8. One end of the diversion pipe 2 is connected to the branch pipe 3, and the other end is connected to the water drainer 5. The end connected to the branch pipe is higher than the end connected to the water drainer. The diversion pipe 2 forms a slope of 3‰ to 7‰ relative to the roadway floor. The water in the diversion pipe 2 flows down the slope into the water drainer 5. The other end of the branch pipe 3 is connected to a gas extraction pump 6, which extracts the gas that has entered the diversion pipe 2.

[0032] Borehole 1 is distributed in rows within the trans-coal seam, with two or more rows of borehole 1, each row containing two or more boreholes; every two rows of borehole 1 are connected to a manifold 8 via borehole connecting pipe 4, and there is one or more manifold 8. For example... Figure 2 As shown, boreholes #1, #3, #5, and #7 form one column, and boreholes #2, #4, #6, and #8 form another column. The gas extracted from the first two columns of boreholes #1 to #8 flows into a single manifold through the borehole connecting pipe. Similarly, the gas extracted from the second two columns of boreholes #1 to #8 flows into a single manifold through the borehole connecting pipe.

[0033] The distance between two rows of boreholes is determined by the extraction radius. For example, if the extraction radius is 3m, the distance between the two rows of boreholes shall not exceed 6m.

[0034] Two or more columns of boreholes 1, where the corresponding rows of boreholes in each column are on a straight line. For example... Figure 2 As shown, holes #1 and #2 in two columns are in a straight line, holes #3 and #4 in two columns are in a straight line, holes #5 and #6 in two columns are in a straight line, and holes #7 and #8 in two columns are in a straight line.

[0035] The borehole connection pipe has a positive slope, with a slope between 3‰ and 5‰. The length of the borehole connection pipe should not be too long, and should be set between 0.2 and 1 meter depending on the construction site. This is to prevent low-lying areas from accumulating water during later pumping operations.

[0036] A gate valve 7 is installed at one end of the branch pipe connecting to the diversion pipe to reasonably regulate the extraction negative pressure during the extraction process. A gate valve is installed on each connecting branch pipe of the borehole to reasonably regulate the extraction negative pressure during the extraction process.

[0037] The branch pipe 2 is equipped with an observation hole 9 at the end of the branch pipe. The gate valve is closer to the branch pipe. The observation hole 9 is used to detect the gas extraction parameters and adjust the extraction negative pressure in a timely manner.

[0038] Construction instructions:

[0039] The selection of gas extraction branch pipes, diversion pipes, and return pipes is determined by flow rate calculations. The diameters of branch pipes, diversion pipes, manifolds, and single-hole connection pipes are selected in a step-by-step decreasing manner from large to small.

[0040] For example: the flow rate of a single extraction borehole is 0.3 m³ / min. 3 / min, the flow rate of a group of 8 boreholes is 2.4m³ / min. 3 / min, the required pipe diameter for the manifold is calculated using the following formula:

[0041]

[0042] D — Pipe diameter, in meters

[0043] Q represents flow rate, m 3 / min

[0044] V represents the flow velocity; the economical flow velocity is generally taken as 10–15 m / s, and 12 m / s is selected.

[0045]

[0046] The flow rate of a single extraction borehole is 0.3 m³ / s. 3 / min, the flow rate of 40 boreholes is 12m³ / min. 3 / min, the required pipe diameter for installing the branch pipe is calculated using the following formula:

[0047]

[0048] D — Pipe diameter, in meters

[0049] Q represents flow rate, m 3 / min

[0050] V represents the flow velocity; the economical flow velocity is generally taken as 10–15 m / s, and 12 m / s is selected.

[0051]

[0052] The installation standards for gas extraction branch pipes, borehole opening locations, manifolds or branch pipes, and water drainers are as follows: they should be laid in order from high to low.

[0053] Pipeline laying slope: Based on the slope of the roadway, the diversion pipe should be laid with a slope of 3‰-7‰. The higher end of the diversion pipe is connected to the gas extraction branch pipe, and the lower end is equipped with a slag discharge and water discharge device to achieve gas and water separation.

[0054] The installation of the extraction pipeline shall be carried out in accordance with the following requirements: each pipeline shall be securely suspended, all flange bolts shall be fully installed, all drain devices shall be in place, extraction metering shall be stable, control valves shall be convenient, pedestrian space shall be spacious, and the hanging height shall be reasonable.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gas-water separation pipeline for mine gas extraction, characterized in that, include: The system comprises boreholes, diversion pipes, and branch pipes. The boreholes are distributed within the coal seam, the diversion pipes are located at the bottom of the roadway, and the branch pipes are located at the top of the roadway. Gas and / or water extracted from the boreholes enter the diversion pipes through a connecting pipe. One end of the diversion pipe is connected to a branch pipe, and the other end is connected to a water drain. The end connected to the branch pipe is higher than the end connected to the water drain. The diversion pipe forms a slope of 3‰ to 7‰ relative to the roadway floor, allowing water in the diversion pipe to flow downhill into the water drain. A gas extraction pump is connected to the other end of the branch pipe to remove the gas entering the diversion pipe.

2. The mine gas extraction water-gas separation pipeline according to claim 1, characterized in that, Also includes: The manifold is connected to the borehole connection pipe. The gas and / or water extracted from the borehole flows into the manifold through the borehole connection pipe and then enters the branch pipe.

3. The mine gas extraction water-gas separation pipeline according to claim 2, characterized in that, The boreholes are distributed in columns in the cross-seam coal seam, with two or more columns of boreholes, and each column has two or more boreholes; every two columns of boreholes are connected to a manifold through a borehole connecting pipe, and there is one or more manifolds.

4. The mine gas extraction water-gas separation pipeline according to claim 3, characterized in that, The two or more columns of boreholes are respectively arranged in a straight line in the corresponding rows of each column.

5. The mine gas extraction water-gas separation pipeline according to claim 1, characterized in that, The boreholes are located in the coal seam in parallel, and there is one or more rows.

6. The mine gas extraction gas-water separation pipeline according to any one of claims 1 to 5, characterized in that, The borehole connecting pipe has a positive slope with a slope between 3‰ and 5‰.

7. The mine gas extraction gas-water separation pipeline according to claim 6, characterized in that, A gate valve is installed at one end of the branch pipe connecting to the diversion pipe.

8. The mine gas extraction gas-water separation pipeline according to claim 7, characterized in that, An observation hole is provided at the end of the branch pipe connected to the diversion pipe.

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