Monitoring, regulating and controlling system in gas extraction and collection

Abstract

The utility model discloses a monitoring regulation and control system in gas extraction and collection, which comprises an extraction pump station, a gas inlet pipe of the extraction pump station is connected with an extraction system main pipe, the extraction system main pipe is connected with a plurality of extraction system branch pipes, a plurality of extraction holes are arranged in a coal seam through drilling operation, and extraction pipes are arranged in the extraction holes. The extraction pipes are connected with the extraction system branch pipes in a one-to-one correspondence mode, each extraction pipe is connected with a pressure sensor and a gas concentration sensor, each extraction pipe is connected with an extraction electromagnetic valve through a flange structure, and the pressure sensors, the gas concentration sensors and the extraction electromagnetic valves at the positions of the extraction pipes are all connected with an electric control device. The electric control device is located in the monitoring room and connected with a display screen. By the adoption of the gas extraction system, a worker can master the extraction pressure and the extraction concentration of a plurality of (generally dozens of) extraction pipes in a monitoring room, corresponding regulation and control can be conducted in time according to the actual working conditions of the extraction pipes, regulation and control efficiency is greatly improved, and the gas extraction system can conduct extraction work more stably and efficiently.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine gas extraction equipment in underground coal mines, in particular to a gas extraction centralized monitoring and control system. Background Art

[0002] Coal mine gas extraction is of great significance. It can prevent gas explosions, improve mine safety, reduce production interruptions caused by gas problems, improve production efficiency, and recover gas to become clean energy after purification, reducing gas waste. Gas is also a potent greenhouse gas. Extracting coal seam gas can reduce environmental pollution caused by gas discharge into the atmosphere.

[0003] The existing gas extraction system includes an extraction pump station. The air inlet pipe of the extraction pump station is connected to the extraction system main pipe, and the extraction system main pipe is connected to several extraction system branch pipes. Multiple extraction holes are drilled in the coal seam, and extraction pipes are arranged in the extraction holes. The extraction pipes are connected to the extraction system branch pipes one by one.

[0004] In coal mine extraction practice, usually a dozen or dozens of extraction holes or even hundreds of extraction holes are extracted at the same time, and the following problems may occur during extraction:

[0005] 1. Unstable system pressure causes decreased extraction efficiency. Due to the large size of the system, various factors such as gas leakage points at any point in the system, decreased performance of negative pressure generating devices, unstable voltage, abnormal changes in gas output, etc. may lead to unstable system pressure.

[0006] Gas extraction needs to maintain a certain negative pressure. If the main pipe of the extraction system cannot maintain a certain negative pressure value, the extraction efficiency of all extraction holes will be reduced. Therefore, it is necessary to develop technology to deal with the reduction of extraction efficiency caused by unstable system pressure.

[0007] 2. The gas content in the coal seam near each extraction hole varies and cannot be very uniform. This results in the gas concentration in some gas extraction holes having dropped to the predetermined stop extraction concentration (such as below 1% or below 0.5%), but the gas concentration in other gas extraction holes is still higher than the predetermined stop extraction concentration.

[0008] In the prior art, usually all the extraction pipes extract and stop at the same time, which will cause some extraction pipes to actually perform ineffective extraction in the later stage, resulting in energy waste.

[0009] Dozens of gas extraction holes are widely distributed. Whether dealing with unstable pressure or uneven extraction speed, workers need to come to the gas extraction holes to handle them. The work intensity is high and the processing efficiency is very low. Utility Model Content

[0010] The utility model aims to provide a gas extraction centralized monitoring and control system, which is convenient for comprehensive centralized monitoring and control of the gas extraction system.

[0011] To achieve the above-mentioned purpose, the gas extraction monitoring and control system of the utility model comprises an extraction pump station, the air inlet pipe of the extraction pump station is connected to the extraction system main pipe, the extraction system main pipe is connected to a plurality of extraction system branch pipes, a plurality of extraction holes are provided in the coal seam through drilling operations, extraction pipes are provided in the extraction holes, and the extraction pipes are connected to the extraction system branch pipes one by one.

[0012] Each extraction pipe is connected to a pressure sensor and a gas concentration sensor, and each extraction pipe is connected to an extraction solenoid valve through a flange structure. The pressure sensor, gas concentration sensor and extraction solenoid valve at each extraction pipe are connected to an electronic control device, which is located in the monitoring room and connected to a display screen.

[0013] The extraction pump station is connected to the extraction system main pipe through the gas-liquid separation box and the water ring vacuum pump. The air inlet pipe of the water ring vacuum pump is connected to the extraction system main pipe, and the air outlet pipe of the water ring vacuum pump is connected to the gas-liquid separation box. The top of the gas-liquid separation box is connected to the air inlet pipe of the extraction pump station. A drain solenoid valve is provided at the bottom of the gas-liquid separation box, and the drain solenoid valve is connected to the wastewater collection container; an upper water level sensor is provided in the middle and lower part of the gas-liquid separation box, and a lower water level sensor is provided at the lower part of the gas-liquid separation box. The drain solenoid valve, the upper water level sensor and the lower water level sensor are all connected to the electronic control device.

[0014] The utility model has the following advantages:

[0015] By adopting the utility model, the staff no longer needs to go to each extraction pipe (usually there are dozens of them, distributed in a large area) for on-site monitoring and control operations, and the work efficiency is high. The staff can grasp the negative pressure and gas concentration conditions at each extraction pipe at any time in the monitoring room. When the gas concentration extracted by a certain extraction pipe has been maintained below the predetermined extraction end pressure for a period of time, the extraction solenoid valve on the extraction pipe can be closed through the electric control device to avoid ineffective extraction of the extraction hole and waste of energy. The negative pressure values ​​at various extraction pipes may be different due to various reasons. The staff can adjust the opening degree of the extraction solenoid valve on each extraction pipe through the electric control device to make the negative pressure at each extraction pipe converge (thereby stabilizing the extraction effect), or close the extraction solenoid valve on the extraction pipe when the pressure of a certain extraction pipe is abnormal, and check the extraction pipe and the extraction hole for gas leakage.

[0016] In short, by adopting the utility model, the staff can grasp the extraction pressure and extraction concentration of multiple (usually dozens of) extraction pipes in the monitoring room, and make corresponding adjustments in time according to the actual working conditions of each extraction pipe, thereby greatly improving the control efficiency and enabling the gas extraction system to perform extraction work more stably and efficiently.

[0017] Coal mine gas may contain water. If water is separated, it may cause corrosion and damage to downstream equipment or reduce its life span, and reduce the quality of the extracted gas. The utility model separates water from the extracted gas, reduces the corrosion of equipment and pipelines, and improves the purity of gas. Through the upper water level sensor and the lower water level sensor, the staff in the monitoring room can grasp the water level in the gas-liquid separation box in real time, and then open or close the drainage solenoid valve through the electric control device in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a schematic diagram of the structure of the utility model. There are multiple sets of extraction holes and extraction tubes, usually dozens of them. For the sake of simplicity, only one set of extraction holes and extraction tubes is shown in the figure.

[0019] Figure 2 It is a schematic diagram of the electric control structure of the utility model. DETAILED DESCRIPTION

[0020] like Figure 1 and Figure 2 As shown, the gas extraction monitoring and control system of the utility model includes an extraction pump station 1, the air inlet pipe of the extraction pump station 1 is connected to the extraction system main pipe 2, the extraction system main pipe 2 is connected to a plurality of extraction system branch pipes 3, a plurality of extraction holes 4 are provided in the coal seam through drilling operations, extraction holes 4 are provided with extraction pipes 5, and the extraction pipes 5 are connected to the extraction system branch pipes 3 one by one.

[0021] Each extraction pipe 5 is connected to a pressure sensor 6 and a gas concentration sensor 7, and each extraction pipe 5 is connected to an extraction solenoid valve 9 through a flange structure 14. The pressure sensor 6, gas concentration sensor 7 and extraction solenoid valve 9 at each extraction pipe 5 are connected to an electric control device 13, which is located in the monitoring room and connected to a display screen 8. The electric control device 13 can be a PLC or an industrial computer. The monitoring room can be set up above or below the coal mine according to local conditions.

[0022] By adopting the utility model, the staff no longer needs to go to each extraction pipe 5 (usually there are dozens of them, distributed in a large area) for on-site monitoring and control operations, and the work efficiency is high. The staff can grasp the negative pressure and gas concentration conditions of each extraction pipe 5 at any time in the monitoring room. When the gas concentration extracted by a certain extraction pipe 5 has been continuously maintained below the predetermined extraction end pressure for a period of time, the extraction solenoid valve 9 on the extraction pipe 5 can be closed through the electric control device 13 to avoid invalid extraction of the extraction hole 4 and waste energy. The negative pressure value of each extraction pipe 5 may be different due to various reasons. The staff can adjust the opening degree of the extraction solenoid valve 9 on each extraction pipe 5 through the electric control device 13 to make the negative pressure at each extraction pipe 5 converge (thereby stabilizing the extraction effect), or close the extraction solenoid valve 9 on the extraction pipe 5 when the pressure of a certain extraction pipe 5 is abnormal, and check the extraction pipe 5 and the extraction hole 4 for gas leakage.

[0023] In short, by adopting the utility model, the staff can grasp the extraction pressure and extraction concentration of multiple (usually dozens of) extraction pipes 5 in the monitoring room, and make corresponding adjustments in time according to the actual working conditions of each extraction pipe 5, thereby greatly improving the control efficiency and enabling the gas extraction system to perform extraction work more stably and efficiently.

[0024] The extraction pump station 1 is connected to the extraction system main pipe 2 through the gas-liquid separation box 15 and the water ring vacuum pump 16. The air inlet pipe of the water ring vacuum pump 16 is connected to the extraction system main pipe 2, and the air outlet pipe of the water ring vacuum pump 16 is connected to the gas-liquid separation box 15. The top of the gas-liquid separation box 15 is connected to the air inlet pipe of the extraction pump station 1. The bottom of the gas-liquid separation box 15 is provided with a drainage solenoid valve 10, and the drainage solenoid valve 10 is connected to the wastewater collection container 17; the wastewater collection container 17 can be a box-type structure or a water storage pit excavated downward. An upper water level sensor 11 is provided in the middle and lower part of the gas-liquid separation box 15, and a lower water level sensor 12 is provided in the lower part of the gas-liquid separation box 15. The drainage solenoid valve 10, the upper water level sensor 11 and the lower water level sensor 12 are all connected to the electronic control device 13.

[0025] If the extracted gas contains water, it may cause corrosion and damage to downstream equipment or reduce its lifespan, and reduce the quality of the extracted gas. The utility model separates water from the extracted gas, reduces the corrosion of equipment and pipelines, and improves the purity of the gas. Through the upper water level sensor 11 and the lower water level sensor 12, the staff in the monitoring room can grasp the water level in the gas-liquid separation box 15 in real time, and then open or close the drainage solenoid valve 10 through the electronic control device 13 in time.

[0026] When working, firstly, a hole is drilled at a predetermined gas extraction location, and the utility model is connected. The water ring vacuum pump 16 is turned on, and the extraction pump station 1 is started, and gas extraction operations are performed on multiple extraction holes 4 at the same time.

[0027] The gas from each extraction hole 4 enters the gas-liquid separation box 15 through the extraction pipe 5, the extraction system branch pipe 3, the extraction system main pipe 2 and the water ring vacuum pump 16. The water accumulates at the bottom of the gas-liquid separation box 15, and the gas is extracted and processed by the extraction pump station 1. When the gas enters the gas-liquid separation box 15 through the water ring vacuum pump 16, the gas flow rate is greatly reduced due to the large volume of the gas-liquid separation box 15, and the water in the gas flow is collected at the bottom of the gas-liquid separation box 15. The accumulation of water level in the gas-liquid separation box 15 is a relatively slow process.

[0028] During the extraction process, the staff can monitor the extraction pressure and extraction concentration of all extraction holes 4 in the monitoring room. If the pressure at a certain extraction pipe 5 is abnormal, the staff can close the extraction solenoid valve 9 on the extraction pipe 5 in time and inspect and maintain the extraction hole 4 and the extraction pipe 5 after monitoring the abnormal pressure phenomenon.

[0029] During the extraction process, when the pressure at each extraction pipe 5 is within the normal range, the pressure at different extraction pipes 5 will not be exactly the same. The staff can close the extraction solenoid valve 9 at the extraction pipe 5 with higher pressure (lower its opening degree) to make the pressure at each extraction pipe 5 converge, which is conducive to overall stable extraction.

[0030] When the extraction starts, if the gas concentration at a certain extraction pipe 5 is abnormally low, it may be that the seal at that extraction pipe 5 is poor. After monitoring, the staff can carry out targeted inspection and maintenance.

[0031] During the extraction process, different extraction holes 4 usually do not reach the predetermined concentration for ending extraction at the same time. When the pressure at a certain extraction pipe 5 is lower than the predetermined concentration for ending extraction and remains for a period of time, the staff can close the extraction solenoid valve 9 on the extraction pipe 5 to avoid continuing to perform ineffective extraction on the extraction hole 4 and wasting negative pressure energy.

[0032] During the extraction process, the staff monitors the water level in the gas-liquid separation box 15 in real time through the signals of the upper water level sensor 11 and the lower water level sensor 12. When the water level reaches the upper water level sensor 11, the staff opens the drainage solenoid valve 10 to discharge the water into the wastewater collection container 17. When the water level drops to the lower water level sensor 12, the staff closes the drainage solenoid valve 10 to stop draining. Since the drainage time is early or late, it has no effect, and the accumulation of water level is also a slow process, the staff does not need to keep a close eye on the water level all the time, and only needs to pay attention to the water level periodically.

[0033] In short, the use of the utility model makes it very convenient for the staff to centrally monitor and adjust the entire extraction system, achieve more stable and more efficient extraction operations, and reduce the energy waste caused by ineffective extraction.

[0034] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A monitoring and control system for gas extraction, including an extraction pump station, an air inlet pipe of the extraction pump station is connected to a main pipe of the extraction system, the main pipe of the extraction system is connected to a plurality of branch pipes of the extraction system, a plurality of extraction holes are provided in the coal seam through drilling operations, extraction pipes are provided in the extraction holes, and the extraction pipes are connected to the branch pipes of the extraction system one by one, characterized in that: Each extraction pipe is connected to a pressure sensor and a gas concentration sensor, and each extraction pipe is connected to an extraction solenoid valve through a flange structure. The pressure sensor, gas concentration sensor and extraction solenoid valve at each extraction pipe are connected to an electronic control device, which is located in the monitoring room and connected to a display screen.

2. The gas extraction centralized monitoring and control system according to claim 1, characterized in that: The extraction pump station is connected to the extraction system main pipe through the gas-liquid separation box and the water ring vacuum pump. The air inlet pipe of the water ring vacuum pump is connected to the extraction system main pipe, and the air outlet pipe of the water ring vacuum pump is connected to the gas-liquid separation box. The top of the gas-liquid separation box is connected to the air inlet pipe of the extraction pump station. A drain solenoid valve is provided at the bottom of the gas-liquid separation box, and the drain solenoid valve is connected to the wastewater collection container; an upper water level sensor is provided in the middle and lower part of the gas-liquid separation box, and a lower water level sensor is provided at the lower part of the gas-liquid separation box. The drain solenoid valve, the upper water level sensor and the lower water level sensor are all connected to the electronic control device.

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