Device and method for promoting gas collection and concentration test in gas drainage pipeline

Abstract

The invention discloses a device and a method for promoting gas collection and concentration test in a gas drainage pipeline. The device comprises a gas collection system, a gas detection system and an information processing system, the gas collection system is used for collecting gas in the pipeline, the flowing direction of the gas in the pipeline is catered through a gas collection device, and a built-in extraction pump is adopted to collect the gas to be tested; the gas detection system is used for detecting the to-be-tested gas collected by the gas collection system through a sensor and testing the gas flow and concentration of the section in real time; and the information processing system is used for converting the gas flow and concentration of the section detected by the gas detection system into electric signals, transmitting the electric signals to the information processing central system, and displaying results on a display screen. The gas in the pipeline section can be automatically collected in real time, the gas concentration and pressure of the section are detected, and the gas flow and concentration in the front section of the section are displayed in real time through data processing.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology for mine pipelines, and in particular to a device and method for promoting gas collection and concentration testing in mine gas drainage pipelines. Background Technology

[0002] Mine gas is one of the main causes of major safety accidents in coal mines. While it is also a valuable resource, its main component, methane (CH4), is the same as natural gas. However, due to its flammable and explosive nature, methane concentrations between 5% and 16% are prone to explosion upon contact with a ignition source. During methane drainage, air is easily mixed in. Approximately 80% of the methane extracted comes from goafs or mining-induced pressure relief zones, and over 70% of this extracted methane has a concentration below 30%, classifying it as low-concentration methane. A significant portion even has a concentration below 20%. This concentration, within the explosive limits, can cause backfire upon contact with an ignition source, leading to a methane explosion and threatening the safety of the drainage system. Furthermore, since gas extraction pipelines are generally quite long and located in complex environments, leaks are prone to occur during the extraction process. Methane is explosive at concentrations between 5% and 16%. Therefore, safety inspections of gas transmission pipelines are crucial for ensuring their safety. In coal mining, implementing pre-extraction before extraction is a fundamental solution to prevent gas accidents in high-gas mines.

[0003] Currently, the market generally uses optical instruments to measure the gas concentration in underground gas drainage pipelines in coal mines. This involves manually extracting gas from the pipeline and then sending the extracted gas into an optical instrument to measure the methane concentration using chemical methods. Pressure measurement, on the other hand, uses a pressure gauge, which is manually fixed to the pipeline to measure the pressure inside the pipeline. The above-mentioned gas concentration and pressure measurements not only need to be performed separately, but also are very inconvenient to operate on-site.

[0004] Based on this understanding, the gas detection of pipelines adopts real-time automatic collection of gas in pipeline sections, and detects the gas concentration and pressure in those sections. Through data processing, the gas flow rate and concentration in the upstream section of the zone are displayed in real time, saving labor costs and achieving significant results. Summary of the Invention

[0005] In order to overcome the above technical problems, the purpose of this invention is to provide a device and method for promoting gas collection and concentration testing in a mine gas drainage pipeline, which can automatically collect gas in a pipeline section in real time, detect the gas concentration and pressure in that section, and display the gas flow rate and concentration in the upstream section of the section in real time through data processing.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A device for promoting gas collection and concentration testing in a mine gas drainage pipeline includes a gas collection system, a gas detection system, and an information processing system;

[0008] The gas collection system is used to collect gas in the pipe, conforming to the gas flow direction in the pipe, and uses a built-in extraction pump to collect the gas to be tested.

[0009] The gas detection system is used to detect the gas to be tested collected by the gas acquisition system through sensors, and to test the gas flow and concentration in the section in real time;

[0010] The information processing system is used to convert the gas flow rate and concentration of the section detected by the gas detection system into electrical signals, which are then transmitted to the central system of information processing and the results are displayed on the screen.

[0011] The gas collection system includes a rigid rubber tube a, an embedded spherical rotating shaft, a pear-shaped rubber airbag, a rigid rubber tube b, a diaphragm air pump, and a desiccant.

[0012] The embedded spherical rotating shaft connects one end of rigid rubber tube a and one end of rigid rubber tube b via a mechanical locking mechanism, enabling rigid rubber tube a to rotate freely 360 degrees. A pear-shaped rubber airbag is installed on rigid rubber tube b, and the other end of rigid rubber tube b is connected to a diaphragm air pump. A desiccant is embedded between the diaphragm air pump and the pressure sensor receiver to prevent moisture in the gas inside the pipe from entering the sensor receiver and damaging the internal electronic components.

[0013] The diaphragm air pump used is the Shanghai Fuchi ADP20GDC diaphragm air pump, with a voltage of 6V, a current of 80mA, a flow rate of 600ml / h, and a vacuum degree of 601mbar.

[0014] The desiccant is a color-changing silica gel desiccant, model: LY-B01, made of silica gel and cobalt chloride.

[0015] The gas detection system includes a pressure sensor, a pressure sensor receiver, wires, a methane sensor, and a sensor power supply;

[0016] The pressure sensors are located at both ends of the rigid rubber tube a, and measure the pressure values ​​at the two locations respectively;

[0017] The pressure sensor is connected to the pressure sensor receiver via a wire, transmitting an electrical signal to the receiver. The sensor power supply provides power to the receiver via the wire. The methane sensor and the pressure sensor receiver transmit the parameter electrical signal values ​​to the data processor via the wire.

[0018] The pressure sensor is a Pengchen Electric PC-100G with an accuracy of 0.5%, a response time of 0.1S, a range of 0-1.6MPa, and uses a current transmitter.

[0019] The sensor power supply uses Senseair sensors with a voltage of 5.5V and a current of 125mA; the power cord uses copper core soft sheath power cord, model RVV, with oxygen-free pure copper core conductor and polyvinyl chloride (PVC) sheath; the methane sensor uses the SJH series, an industrial-grade gas sensor for real-time measurement of gas concentration changes. It uses non-dispersive infrared detection technology (NDIR) to compare thermocatalysis and semiconductor principles, with a response time of less than 25s, a range of 0-5%, and an accuracy of 0.06%.

[0020] The information processing system includes a data processor, a signal transmission port, a signal receiving port, and a display screen;

[0021] The sensor's electrical signal is transmitted to the signal receiving port via a wire. The signal receiving port then transmits the electrical signal to the data processor via another wire. The data processor processes the electrical signal and displays it on the screen via the signal output port, with the connection made by the wires.

[0022] The data processor is an MS320F206PZA DSP digital signal processor.

[0023] The rigid rubber tube b port is designed as a hemispherical hollow container with a diameter not exceeding the diameter of the orifice.

[0024] The rigid rubber tube b port is designed as a rectangular hollow container with a porous square shape;

[0025] The rigid rubber tube b port is designed as a spherical container with a porous circular shape.

[0026] The pear-shaped rubber airbag is connected to the nitrogen inflation device via a gas pipeline. The auxiliary control box is connected to the nitrogen inflation device via an electrical wire and is responsible for controlling the opening and closing of the nitrogen inflation device. The auxiliary control box is also connected to the pear-shaped airbag via an electrical wire and is responsible for receiving the internal pressure signal of the pear-shaped airbag and controlling its forward and backward movement. The nitrogen inflation device is connected to the nitrogen and the pear-shaped airbag via a gas pipe and is responsible for inflating the pear-shaped airbag by controlling the nitrogen cylinder switch. The purpose is to fix the pear-shaped airbag at the gas extraction pipe opening through the internal nitrogen pressure, thereby isolating the gas inside and outside the pipe and preventing the gas extraction device from extracting gas from outside the pipe.

[0027] A method for using a device to promote gas collection and concentration testing in a mine gas drainage pipeline includes the following steps:

[0028] Step 1: By placing the device into the corresponding pipe beforehand, with the rigid rubber tube facing any direction, if the display shows a flow rate, the gas flow rate inside the tube is opposite to the direction of the rigid rubber tube. If the display shows no value, the gas flow rate inside the tube is the same as the direction of the rigid rubber tube, thus understanding the direction of gas flow in the pipe.

[0029] Step 2: Insert the gas sampling device for promoting gas collection and concentration testing in the mine gas drainage pipeline into the pre-reserved detection hole on the pipeline. Adjust the embedded spherical rotating shaft connecting the rigid rubber tube a and the rigid rubber tube b through the rubber tube mechanical device to achieve 360-degree free rotation of the rigid rubber tube a, so that the end of the rigid rubber tube a "meets" the flow direction of the gas in the pipeline.

[0030] Step 3: Connect the pear-shaped rubber airbag to the auxiliary control box. Use the nitrogen inflation device of the auxiliary control box to fix the pear-shaped airbag at the gas pre-extraction pipeline detection hole until the pressure value of the auxiliary control box no longer changes, then turn off the auxiliary inflation device.

[0031] Step 4: Turn on the gas detection system of the device that promotes gas collection and concentration testing in the mine gas extraction pipeline, turn on the main power switch and the sensor power in sequence, wait for 10 minutes, and record the data after the methane concentration and flow data on the display screen (12) have stabilized.

[0032] The beneficial effects of the present invention.

[0033] 1. The outer shell of the device for promoting gas collection and concentration testing in the mine gas drainage pipeline of the present invention is made of refractory aluminum material, and the inner side is made of high-strength and high-density explosion-proof plate, which can effectively improve the device's pressure resistance and explosion-proof capability.

[0034] 2. The present invention designs the gas sampling system of the device as a closed, retractable rigid rubber tube with strong pressure resistance, which makes it easy to send the rubber tubes a and b into the designated area through the detection hole during use.

[0035] 3. This invention inserts a pear-shaped rubber airbag into a designated detection port of a pipeline, inflates the airbag with an auxiliary device, and uses a pressure device to preset the pressure limit of the airbag, so that the airbag stays in the area of ​​the detection port, effectively sealing the port, saving costs, and providing strong sealing performance.

[0036] 4. This invention can solve the problem of directing the direction of gas flow in the pipe by inserting the rubber tube. It uses an embedded spherical rotating shaft to connect the rigid rubber tube a and the rigid rubber tube b through a mechanical lock, so that the rigid rubber tube a can rotate freely 360 degrees. It is practical and easy to promote and use.

[0037] In summary, the device for promoting gas collection and concentration testing in mine gas drainage pipelines of this invention has a simple structure, reasonable design, and convenient implementation. It proposes a more efficient method for pipeline gas collection, realizes real-time detection of pipeline gas concentration and flow, saves manpower and material resources, is highly practical, has good performance, and is easy to promote and use. Attached image description:

[0038] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0039] Figure 2 This is a schematic diagram of a gas detection system.

[0040] Figure 3 This is a structural diagram of the gas collection method.

[0041] Figure 4 This is an auxiliary inflation and sealing device for an external pear-shaped airbag.

[0042] Figure label:

[0043] 1-Rigid rubber tube a; 2-Rotating shaft; 3-Pressure sensor; 4-Pear-shaped rubber airbag; 5-Rigid rubber tube b; 6-Exhaust port; 7-Desiccant; 8-Exhaust port; 9-Data processor; 10-Signal transmission port; 11-Signal receiving port; 12-Display screen; 13-Inlet pipe; 14-Diaphragm air pump; 15-Pressure sensor receiver; 16-Wire; 17-Methane sensor; 18-Sensor power supply; 19-Main power supply; 20-Inner shell; 21-Outer metal shell; 22-Nitrogen cylinder. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] like Figure 1 As shown, a device for promoting gas collection and concentration testing in a mine gas extraction pipeline includes a gas collection system A, a gas detection system B, and an information processing system C. The gas collection system A includes: a rigid rubber tube a1, an embedded spherical shaft 2, a pear-shaped rubber airbag 4, a rigid rubber tube b5, a diaphragm-type air pump 14, and a desiccant 7. The embedded spherical shaft 2 connects the rigid rubber tube a1 and the rigid rubber tube b5 via a mechanical locking mechanism, allowing the rigid rubber tube a1 to rotate freely 360 degrees.

[0046] like Figure 2As shown, the gas detection system B includes a pressure sensor receiver 15, a wire 16, a methane sensor 17, and a sensor power supply 18.

[0047] Pressure sensor 3 is a Pengchen Electric PC-100G, with an accuracy of 0.5%, a response time of 0.1s, and a range of 0-1.6MPa, employing a current transmitter. Sensor power supply 18 uses a Senseair sensor power supply with a voltage of 5.5V and a current of 125mA. Cable 16 is a copper core soft-sheathed power cable, model RVV, with an oxygen-free pure copper core conductor and a polyvinyl chloride (PVC) sheath. Methane sensor 17 is an SJH series industrial-grade gas sensor for real-time measurement of gas concentration changes. It uses non-dispersive infrared (NDIR) detection technology, contrast thermocatalysis, and semiconductor principles, with a response time of less than 25s, a range of 0-5%, and an accuracy of 0.06%. Information processing system C includes a data processor 9, a signal output port 10, a signal receiving port 11, and a display screen 12. Data processing utilizes the principle that there is a relationship between the pressure difference generated by the fluid flowing through the pressure sensor and the flow rate; flow rate is determined by measuring the pressure difference.

[0048] The data processing method utilizes the principle that there is a certain relationship between the pressure difference generated by the fluid flowing through the pressure sensor and the flow rate. Flow rate is determined by measuring the pressure difference. The working principle of the differential pressure flowmeter is based on the laws of conservation of mass (continuity equation) and energy conservation, expressed by the continuity equation: V1*A1*P1=V2*A2*P2, and the energy conservation law: P1+1 / 2V 2 ρ1 = constant.

[0049]

[0050] V1 is the flow velocity of pressure sensor 3a; V2 is the flow velocity of pressure sensor 3b in the pipeline; A1 is the cross-sectional area of ​​pressure sensor 3a; A2 is the cross-sectional area of ​​pressure sensor 3b; P1 is the pressure of pressure sensor 3a; P2 is the pressure of pressure sensor 3b; Q is the gas flow rate.

[0051] like Figure 3 As shown, Figure 3 (a) is a schematic diagram of the opening position of the gas detection hole in the pipeline. This invention designs three gas collection methods (b), (c), and (d). In method (b), the rubber port facing the gas in the pipeline is designed as a hemispherical hollow container with a diameter not exceeding the diameter of the opening. The right side diagram of method (b) shows the cross-sectional view of the port, which is a porous circular shape. In method (c), the rubber port facing the gas in the pipeline is designed as a rectangular hollow container. The right side diagram shows the cross-sectional view of the port, which is a porous square shape. In method (d), the rubber port facing the gas in the pipeline is designed as a spherical container. The right side diagram shows the cross-sectional view of the port, which is a porous circular shape.

[0052] "To meet" means to face the gas inside the pipe.

[0053] The three methods are designed to extract gas from the pipeline in three ways: Method (b) is hemispherical and designed to extract as much gas as possible from the pipeline; Method (c) is designed to increase the distance before and after the pressure sensor in the pipeline to effectively measure the gas flow velocity in the pipeline; Method (d) is designed to extract gas from the pipeline from multiple directions without having to change the direction of the extraction pipe according to the gas flow direction in the pipeline.

[0054] like Figure 4 The auxiliary control box contains a nitrogen cylinder 22 and mainly consists of a gas source, a control device, and a gas supply pipeline. The top of the pear-shaped rubber airbag 4 is connected to a nitrogen inflation device via an air tube.

[0055] The pear-shaped rubber airbag 4 is connected to the nitrogen inflation device via a gas pipeline. The auxiliary control box is also connected to the nitrogen inflation device, which is connected to the nitrogen cylinder 22 via a gas pipeline. The auxiliary control box activates the nitrogen inflation device via an electrical signal, and the nitrogen inflation device inflates the pear-shaped rubber airbag 4 by connecting to the nitrogen cylinder through a gas supply pipeline.

[0056] A method for using a device to promote gas collection and concentration testing in a mine gas drainage pipeline includes the following steps:

[0057] Step 1: By placing the device in the corresponding pipe beforehand, with the rigid rubber tube 3a facing any direction, if the display shows a flow rate, the gas flow rate in the pipe is opposite to the direction of the rigid rubber tube 3a. If the display shows no value, the gas flow rate in the pipe is the same as the direction of the rigid rubber tube 3a, thus understanding the direction of gas flow in the pipe.

[0058] Step 2: Insert the gas sampling device for promoting gas collection and concentration testing in the mine gas drainage pipeline into the pre-reserved detection hole on the pipeline. Adjust the embedded spherical rotating shaft 2 connecting the rigid rubber tube a1 and the rigid rubber tube b5 through the rubber tube mechanical device to achieve 360-degree free rotation of the rigid rubber tube a1, so that the end of the rigid rubber tube a1 "caters" to the flow direction of the gas in the pipeline.

[0059] Step 3: Connect the pear-shaped rubber airbag 4 to the auxiliary control box. Start. Figure 4 The nitrogen inflation device in the auxiliary control box fixes the pear-shaped airbag 4 at the gas pre-extraction pipeline detection hole (e.g., Figure 3 a) until Figure 4 The pressure value in the auxiliary control box no longer changes, so the auxiliary inflation device is turned off.

[0060] Step 4: Turn on the gas detection system B of the device that promotes gas collection and concentration testing in the mine gas drainage pipeline. Turn on the main power switch 19 and the sensor power switch 18 in sequence. Wait 10 minutes until the methane concentration and flow data on the display screen 12 stabilize, and then record the data.

[0061] The device for promoting gas collection and concentration testing in mine gas drainage pipelines of this invention has a simple structure, reasonable design, and is easy to implement. It proposes a more efficient method for pipeline gas collection, realizes real-time detection of pipeline gas concentration and flow, saves manpower and material resources, is highly practical, has good performance, and is easy to promote and use.

[0062] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A device for promoting gas collection and concentration testing in a mine gas drainage pipeline, characterized in that, It includes a gas acquisition system (A), a gas detection system (B), and an information processing system (C); The gas collection system (A) is used to collect gas in the pipe, conforming to the gas flow direction in the pipe, and uses a built-in extraction pump to collect the gas to be tested; The gas detection system (B) is used to detect the gas collected by the gas acquisition system (A) through sensors, and to test the gas flow rate and concentration of the section in real time. The information processing system (C) is used to convert the gas flow rate and concentration of the section detected by the gas detection system (B) into electrical signals, which are then transmitted to the central system of information processing and the results are displayed on the screen.

2. The device for promoting gas collection and concentration testing in a mine gas drainage pipeline according to claim 1, characterized in that, The gas collection system (A) includes a rigid rubber tube a (1), an embedded spherical rotating shaft (2), a pear-shaped rubber airbag (4), a rigid rubber tube b (5), a diaphragm air pump (14), and a desiccant (7); The embedded spherical rotating shaft (2) is connected to one end of the rigid rubber tube a (1) and one end of the rigid rubber tube b (5) by a mechanical lock, so that the rigid rubber tube a (1) can rotate freely 360 degrees; a pear-shaped rubber airbag (4) is provided on the rigid rubber tube b (5), and the other end of the rigid rubber tube b (5) is connected to the diaphragm air pump (14); the desiccant (7) is embedded between the diaphragm air pump (14) and the pressure sensor receiver (15).

3. The device for promoting gas collection and concentration testing in a mine gas drainage pipeline according to claim 1, characterized in that, The gas detection system (B) includes a pressure sensor (3), a pressure sensor receiver (15), a wire (16), a methane sensor (17), and a sensor power supply (18); The pressure sensors (3) are located at both ends of the rigid rubber tube a (1) and measure the pressure values ​​at the two locations respectively; The pressure sensor (3) is connected to the pressure sensor receiver (15) via a wire (16) to transmit electrical signals to the pressure sensor receiver (15). The sensor power supply provides power to the sensor receiver via the wire (16). The methane sensor (17) and the pressure sensor receiver (15) transmit the parameter electrical signal values ​​to the data processor (9) via the wire (16).

4. The device for promoting gas collection and concentration testing in a mine gas drainage pipeline according to claim 1, characterized in that, The information processing system (C) includes a data processor (9), a signal transmission port (10), a signal receiving port (11), and a display screen (12); The sensor electrical signal is transmitted to the signal receiving port (11) through the wire (16). The signal receiving port (11) transmits the electrical signal to the data processor (9) through the wire. The data processor (9) displays the processed electrical signal on the display screen (12) through the signal output port, with the wire connecting the two. The data processor (9) is an MS320F206PZA DSP digital signal processor.

5. The device for promoting gas collection and concentration testing in a mine gas drainage pipeline according to claim 1, characterized in that, The rigid rubber tube b(5) port is designed as a hemispherical hollow container with a diameter not exceeding the diameter of the orifice; Alternatively, the port of the rigid rubber tube b(5) may be designed as a rectangular hollow container with a porous square shape; Alternatively, the port of the rigid rubber tube b(5) may be designed as a spherical container with a porous circular shape.

6. The device for promoting gas collection and concentration testing in a mine gas drainage pipeline according to claim 1, characterized in that, The pear-shaped rubber airbag (4) is connected to the nitrogen inflation device through a gas pipeline. The auxiliary control box is connected to the nitrogen inflation device through an electric wire to control the opening and closing of the nitrogen inflation device. The auxiliary control box is connected to the pear-shaped airbag (4) through an electric wire and is responsible for receiving the internal pressure signal of the pear-shaped airbag (4) and controlling the forward and backward movement of the pear-shaped airbag (4). The nitrogen inflation device is connected to the nitrogen and the pear-shaped airbag (4) through a gas pipe and is responsible for inflating the pear-shaped airbag (4) by controlling the switch of the nitrogen cylinder (22).

7. A method of using the device for promoting gas collection and concentration testing in a mine gas drainage pipeline according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: By placing the device in the corresponding pipe in advance, with the rigid rubber tube 3(a) facing any direction, if there is a flow rate on the display screen (12), the gas flow rate in the pipe is opposite to the direction of the rigid rubber tube 3(a). If there is no value on the display screen (12), the gas flow rate in the pipe is consistent with the direction of the rigid rubber tube 3(a), thus understanding the direction of gas flow in the pipe. Step 2: Insert the gas sampling device for promoting gas collection and concentration testing in the mine gas extraction pipeline into the pre-reserved detection hole on the pipeline. Adjust the embedded spherical rotating shaft (2) connecting the rigid rubber tube a (1) and the rigid rubber tube b (5) through the rubber tube mechanical device to realize the 360-degree free rotation of the rigid rubber tube a (1) so that the end of the rigid rubber tube a (1) "caters" to the flow direction of the gas in the pipeline. Step 3: Connect the pear-shaped rubber airbag (4) to the auxiliary control box; start the nitrogen inflation device of the auxiliary control box to fix the pear-shaped airbag (4) at the gas pre-extraction pipeline detection hole until the pressure value of the auxiliary control box no longer changes, and then turn off the auxiliary inflation device. Step 4: Turn on the gas detection system (B) of the device for promoting gas collection and concentration testing in the mine gas drainage pipeline, turn on the main power switch (19) and the sensor power supply (18) in sequence, wait for 10 minutes, and record the data after the methane concentration and flow data on the display screen (12) have stabilized.

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