A method for treating gas in a return corner of a coal mining face of a coal mine

Abstract

The present application aims at providing a coal mine working face return air corner gas control method, belonging to the technical field of coal mine gas control. The present application optimizes the extraction system of the coal face with removed supports, cooperates with the construction of the air control and ventilation facilities at the return air roadway, forms a natural negative pressure system for the extraction pipeline, ensures the gas extraction effect of the upper corner, and achieves the purpose of controlling the gas of the return air corner of the coal face.

Description

Technical Field

[0001] This invention belongs to the field of coal mine gas control technology, specifically relating to a method for controlling gas in the return air corner of a coal mining face. Background Technology

[0002] During mine production, the upper corner of the longwall face is prone to poor ventilation and excessive gas accumulation due to its unique location and structure, posing a significant threat to mine safety. This is especially true in high-gas (outburst) mines, where upper corner gas control is often a major challenge. Traditional methods for upper corner gas control primarily employ a low-negative-pressure drainage system connected to the upper corner via compressed air ducts for pre-drainage and control of the gas.

[0003] During the dismantling of the coal mining face, the gas emission rate is relatively low because it is no longer affected by coal mining collapses. The gas level in the upper corner is generally low, and the demand for gas drainage in the goaf is small. Meanwhile, other coal mining faces that are in normal production can increase the drainage capacity of the goaf. Based on this consideration, we propose a new method for controlling gas in the return air corner of coal mining faces. Summary of the Invention

[0004] The purpose of this invention is to provide a method for controlling gas in the return air corner of a coal mining face. This invention optimizes the gas extraction system of the coal mining face after the support frame is removed, and cooperates with the construction of ventilation control facilities at the entrance of the return airway to create a natural negative pressure system in the extraction pipeline, thereby ensuring the gas extraction effect in the upper corner and achieving the purpose of controlling gas in the return air corner of the coal mining face.

[0005] The present invention adopts the following technical solution: A method for controlling gas in the return air corner of a coal mine working face includes the following steps: S1. After the coal mining face has been mined to the end, disconnect the exhaust pipeline at the entrance of the return airway from the coal mining face. S2. Retain the drainage pipeline from the upper corner of the coal mining face to the entrance of the return air roadway; S3. Before the exhaust pipe is disconnected at the entrance of the return air tunnel, construct an air volume regulating facility to control the air volume. Connect the exhaust pipe to the air volume regulating facility to form a natural negative pressure system. S4. By using a natural negative pressure system, the gas in the upper corner is guided into the return airway through the extraction pipeline, thereby achieving the purpose of controlling the gas in the return air corner of the coal mining face.

[0006] Furthermore, an auxiliary haulage roadway, a main haulage roadway, and a return airway are sequentially arranged below the coal mining face.

[0007] Furthermore, the auxiliary transport roadway and the main transport roadway are connected by the intake air roadway and the return air roadway of the mining face, and an air volume regulating facility is provided at the connection between the return air roadway and the auxiliary transport roadway.

[0008] Furthermore, the extraction pipeline enters the return air roadway from the coal mining face via the return air bypass.

[0009] Furthermore, the extraction pipeline is connected to a negative pressure ventilation duct at one end of the coal mining face.

[0010] Furthermore, the air volume regulating facility consists of regulating wall one located at the connection between the return air bypass and the return air roadway, and regulating wall two located at the connection between the return air roadway and the auxiliary transport roadway of the mining face. Both regulating wall one and regulating wall two are equipped with ventilation openings, and the exhaust pipe is connected to the ventilation opening of regulating wall one.

[0011] The beneficial effects of this invention are as follows: This invention utilizes the natural wind pressure of the mine to replace the gas extraction pump, and uses extraction pipelines to pre-extract gas from the upper corner of the working face of the support frame.

[0012] This invention utilizes the natural air pressure of the mine through a drainage pipeline, and regulates the negative pressure inside the drainage pipeline by constructing a regulating wall in the return air roadway of the working face to control the gas in the upper corner of the working face. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structural layout of the treatment method of the present invention; Wherein: 1-Goaf; 2-Extraction pipeline; 3-Auxiliary haulage roadway; 4-Main haulage roadway; 5-Return airway; 6-Intake airway of the mining face; 7-Return airway of the mining face; 8-Negative pressure ventilation duct; 9-Regulating wall one; 10-Return air bypass; 11-Regulating wall two. Detailed Implementation

[0014] The invention will be further described with reference to the accompanying drawings.

[0015] As shown in the figure, a method for controlling gas in the return air corner of a coal mine working face includes the following steps: S1. After the coal mining face has been mined to the end, disconnect the drainage pipeline 2 at the 5th entrance of the return airway from the coal mining face. S2. Retain the drainage pipeline 2 from the upper corner of the coal mining face to the 5th entrance of the return airway; S3. Before the disconnection of the exhaust pipe 2 at the 5th entrance of the return airway, construct an air volume regulating facility to control the air volume. The exhaust pipe 2 is connected to the air volume regulating facility to form a natural negative pressure system. S4. Through the natural negative pressure system, the gas in the upper corner is guided into the return airway 5 through the extraction pipeline 2, so as to achieve the purpose of controlling the gas in the return air corner of the coal mining face.

[0016] Furthermore, an auxiliary haulage roadway 3, a main haulage roadway 4, and a return airway 5 are sequentially arranged below the coal mining face.

[0017] Furthermore, the auxiliary transport lane 3 and the main transport lane 4 are connected by the intake air lane 6 and the return air lane 7 of the mining face, and an air volume regulating facility is provided at the connection between the return air lane 7 of the mining face and the auxiliary transport lane 3.

[0018] Furthermore, the extraction pipeline 2 enters the return air roadway 5 from the coal mining face via the return air bypass 10.

[0019] Furthermore, the extraction pipeline 2 is connected to a negative pressure ventilation duct 8 at one end of the coal mining face.

[0020] Furthermore, the air volume regulating facility is a regulating wall 9 located at the connection between the return air bypass 10 and the return air lane 5, and a regulating wall 11 located at the connection between the return air lane 7 and the auxiliary transport lane 3. Both regulating walls 9 and 11 are provided with ventilation openings, and the exhaust pipe 2 is connected to the ventilation opening of regulating wall 9.

[0021] Example Currently, the fourth panel of Changping Mine has one removal face and one longwall face, both of which are drained from their upper corners by the third gas drainage pump station in the fourth panel. To ensure effective gas control in the upper corner of the longwall face without causing gas accumulation in the upper corner of the removal face, the drainage volume in the upper corner of the longwall face is often increased by reducing the drainage volume in the upper corner of the removal face to ensure normal production in the longwall face. However, Changping Mine uses a mechanical extraction ventilation method, and the removal face is relatively close to the Busan return air shaft, resulting in a smaller demand for upper corner drainage. Based on this consideration, we propose using the mine's natural air pressure to replace the gas drainage pump and pre-drain the gas in the upper corner of the removal face through drainage pipelines.

[0022] Traditionally, gas drainage pumps are used to manage gas in the upper corner of the working face through drainage pipelines. Drainage effect: The negative pressure at the upper corner of 4330 was 1.2 kPa, the gas concentration was 0.12%, and the drainage volume was 151.8 m³. 3 / min.

[0023] The method of this invention utilizes natural ventilation pressure in the mine to control methane in the upper corner of the working face. The 4330 working face is relatively close to the bottom of the Busan return air shaft. By constructing a regulating wall at the break point of the extraction pipeline at the bottom of the Busan return air shaft (the break point of the extraction pipeline is about 240 meters away from the bottom of the Busan return air shaft), the extraction pipeline forms a negative pressure and is extended to the working face through two Φ400 negative pressure ventilation ducts to pre-extract gas from the upper corner.

[0024] Drainage effect: The negative pressure at the upper corner of the 4330 pump was 0.86 kPa, the gas concentration was 0.14%, and the drainage volume was 116 m³. 3 / min.

[0025] This invention utilizes natural wind pressure to control gas in the upper corner of the working face. Compared with the traditional method of using a gas extraction pump to control gas in the upper corner of the working face through extraction pipelines, it can still achieve a better gas extraction effect.

Claims

1. A method for controlling gas in the return air corner of a coal mining face, characterized in that: Includes the following steps: S1. After the coal mining face is completed, disconnect the drainage pipeline (2) at the entrance of the return airway (5) from the coal mining face. S2. Retain the drainage pipeline (2) from the upper corner of the coal mining face to the entrance of the return airway (5); S3. Before the disconnection of the exhaust pipe (2) at the entrance of the return airway (5), construct an air volume regulation facility to control the air volume. Connect the exhaust pipe (2) to the air volume regulation facility to form a natural negative pressure system. S4. Through the natural negative pressure system, the gas in the upper corner is guided into the return airway (5) through the extraction pipeline (2) to achieve the purpose of controlling the gas in the return air corner of the coal mining face.

2. The method for controlling gas in the return air corner of a coal mining face according to claim 1, characterized in that: The coal mining face is provided with an auxiliary haulage roadway (3), a main haulage roadway (4), and a return airway (5) in sequence below it.

3. The method for controlling gas in the return air corner of a coal mining face according to claim 2, characterized in that: The auxiliary transport lane (3) and the main transport lane (4) are connected by the intake air lane (6) and the return air lane (7) of the mining face. Air volume adjustment facilities are provided at the connection between the return air lane (7) of the mining face and the auxiliary transport lane (3).

4. The method for controlling gas in the return air corner of a coal mining face according to claim 3, characterized in that: The extraction pipeline (2) enters the return air roadway (5) from the coal mining face through the return air bypass (10).

5. A method for controlling gas in the return air corner of a coal mining face according to claim 1, characterized in that: The extraction pipeline (2) is connected to a negative pressure ventilation duct (8) at one end of the coal mining face.

6. The method for controlling gas in the return air corner of a coal mining face according to claim 4, characterized in that: The air volume regulating facilities are regulating wall one (9) located at the connection between the return air bypass (10) and the return air roadway (5) and regulating wall two (11) located at the connection between the return air roadway (7) and the auxiliary transport roadway (3). Both regulating wall one (9) and regulating wall two (11) are equipped with ventilation openings, and the exhaust pipe (2) is connected to the ventilation opening of regulating wall one (9).

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