Accurate metering and checking device for gas displacement effect of CO2 / N2 mixed gas

Abstract

The utility model discloses an accurate metering and checking device for the gas displacement effect of CO2 / N2 mixed gas, which comprises a gas-liquid separator, a CO2 absorber, a gas concentration detector and an electronic scale, and is characterized in that the gas-liquid separator is used for carrying out gas-liquid separation on mixed gas and liquid extracted from a drill hole; the CO2 absorber is used for absorbing and removing CO2 gas in the mixed gas, and the electronic scale is used for weighing the amount of the absorbed CO2 gas and determining the mass of the CO2 gas in the mixed gas; the gas concentration detector is used for detecting the gas concentration in the gas, and the change condition of the flow before and after the CO2 gas is removed can be obtained through comparative analysis of the first gas flow meter and the second gas flow meter; finally, the required detection data is quickly and accurately obtained, the gas injection displacement effect evaluation is realized, the whole detection process does not need complicated measurement procedures, and the device is simple in structure and convenient to use.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas drainage devices, and particularly relates to a precise metering and inspection device for the effect of CO2 / N2 mixed gas displacing gas. Background Technique

[0002] Coal is the backup energy for the leading energy in China. As a highly efficient and clean resource associated with coal, efficient gas drainage is the fundamental method for preventing gas disaster accidents and an important way to obtain clean energy. The coal seam structure in China is complex, and the coal body permeability is generally low. With the increasing depletion of shallow coal resources, coal development has shifted to the deep and become normal, and the low-permeability characteristics of coal seams are becoming more obvious, increasing the difficulty of gas drainage and the pressure of gas disaster prevention and control. The coal seam permeability in most mining areas in China is low. At present, CO2 / N2 mixed gas is mainly used for gas injection displacement and flow increase for gas drainage, which is one of the effective methods to improve the gas drainage efficiency of low-permeability coal seams. However, at present, the displacement effect after gas injection cannot be timely feedback, and complex manual measurements are required. Moreover, the existing technology has defects such as long detection time and inaccurate detection.

[0003] Therefore, how to provide a new detection device that not only requires no complex measurement procedures, but also has a simple structure, is easy to use, and is convenient for quickly and accurately obtaining the required detection data to realize the effect evaluation of gas injection displacement is the research direction required by this application. Summary of the Invention

[0004] Aiming at the problems existing in the above-mentioned prior art, the utility model provides a precise metering and inspection device for the effect of CO2 / N2 mixed gas displacing gas, which can effectively solve the above-mentioned technical problems.

[0005] In order to achieve the above purpose, the technical scheme adopted by the utility model is: a precise metering and inspection device for the effect of CO2 / N2 mixed gas displacing gas, including a gas-liquid separator, a CO2 absorber, a gas concentration detector, and an electronic scale;

[0006] The upper part of the gas-liquid separator is provided with an air inlet pipe and an exhaust pipe, and the lower part is provided with a drain pipe. The air inlet pipe is connected to the gas drainage head and is used to transport the mixed gas-liquid extracted from the borehole into the gas-liquid separator for gas-liquid separation; the drain pipe is used to discharge the separated liquid, and the exhaust pipe is connected to the CO2 absorber and is used to transport the separated mixed gas to the CO2 absorber;

[0007] The CO2 absorber is placed on an electronic scale and contains a CO2 absorption liquid inside. The CO2 absorption liquid is used to absorb CO2 gas in the mixed gas, and the electronic scale is used to weigh the amount of CO2 gas absorbed. An exhaust port is opened at the upper part of the CO2 absorber, and the exhaust port is connected to the intake port of the gas concentration detector through a connecting pipe, which is used to transport the gas after CO2 gas absorption to the gas concentration detector. The gas concentration detector is used to detect the gas concentration of the gas, and the exhaust port of the gas concentration detector is connected to the gas drainage negative pressure pipe, and the gas drainage negative pressure pipe is used to provide negative pressure for the whole device.

[0008] Furthermore, a valve is installed on the intake pipe to control the gas drainage detection by controlling the on-off of the intake pipe. A first gas flowmeter is installed on the exhaust pipe to detect the flow rate of the mixed gas after gas-liquid separation. A second gas flowmeter is installed on the connecting pipe to detect the flow rate of the gas after CO2 gas absorption.

[0009] Furthermore, the electronic scale is a precision electronic scale, and a liquid crystal display screen is provided on the precision electronic scale. Using this device can not only improve the weighing accuracy but also facilitate reading.

[0010] Furthermore, the intake pipe is connected to the gas drainage head through a drainage hose. Adding a drainage hose facilitates the position adjustment of the gas drainage head and ensures the drainage detection of the displacement effect of different positions of the drill holes.

[0011] Furthermore, it also includes a leveling partition plate. The gas-liquid separator, the gas concentration detector, and the electronic scale are all placed on the leveling partition plate, and the leveling partition plate is used to keep its upper surface horizontal. By maintaining the level, the weighing accuracy of the electronic scale is ensured.

[0012] Furthermore, the drainage pipe is connected to the drainage main pipe, which is used to discharge the liquid to the drainage main pipe for collection.

[0013] Compared with the prior art, the utility model combines a gas-liquid separator, a CO2 absorber, a gas concentration detector, and an electronic scale. The gas-liquid separator is used to separate the gas-liquid mixture extracted from the drill hole. The CO2 absorber is used to absorb and remove CO2 gas in the mixed gas. The electronic scale is used to weigh the amount of CO2 gas absorbed to determine the mass of CO2 gas in the mixed gas. The gas concentration detector is used to detect the gas concentration of the gas, and through the comparison and analysis of the first gas flowmeter and the second gas flowmeter, the change in the flow rate before and after removing CO2 gas can be obtained. Finally, the required detection data can be quickly and accurately obtained to realize the evaluation of the injection displacement effect, and the whole inspection process not only does not require complex measurement procedures but also has a simple structure and is convenient to use. Description of the Drawings

[0014] Figure 1It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 is Figure 1 a schematic cross-sectional structure diagram of the gas-liquid separator and the CO2 absorber.

[0016] In the figure: 1, gas drainage head; 2, drainage hose; 3, valve; 4, first gas flowmeter; 5, gas concentration detector; 6, gas drainage negative pressure pipe; 7, second gas flowmeter; 8, CO2 absorber; 9, electronic scale; 10, liquid crystal display screen; 11, total drainage pipe; 12, drainage pipe; 13, gas-liquid separator; 14, intake pipe; 15, CO2 absorption liquid; 16, leveling partition board. Specific implementation manners

[0017] The present utility model will be further described below.

[0018] As Figure 1 and 2 shown, the utility model includes a gas-liquid separator 13, a CO2 absorber 8, a gas concentration detector 5 and an electronic scale 9;

[0019] The upper part of the gas-liquid separator 13 is provided with an intake pipe 14 and an exhaust pipe, and the lower part is provided with a drainage pipe 12. The intake pipe 14 is connected to the gas drainage head 1, and is used for transporting the mixed gas-liquid extracted from the borehole into the gas-liquid separator 13 for gas-liquid separation; the drainage pipe 12 is used for discharging the separated liquid, and the exhaust pipe is connected to the CO2 absorber 8, and is used for transporting the separated mixed gas to the CO2 absorber 8;

[0020] The CO2 absorber 8 is placed on the electronic scale, and its interior contains the CO2 absorption liquid 15. The CO2 absorption liquid 15 is used for absorbing the CO2 gas in the mixed gas, and the electronic scale 9 is used for weighing the amount of absorbed CO2 gas; an exhaust port is opened at the upper part of the CO2 absorber, and the exhaust port is connected to the intake port of the gas concentration detector 5 through a connecting pipe, and is used for transporting the gas after the CO2 gas is absorbed to the gas concentration detector 5. The gas concentration detector 5 is used for detecting the gas concentration in the gas, and the exhaust port of the gas concentration detector 5 is connected to the gas drainage negative pressure pipe 6, and the gas drainage negative pressure pipe 6 is used for providing the drainage negative pressure for the whole device.

[0021] A valve 3 is installed on the intake pipe 14 to control the gas drainage detection by controlling the on / off of the intake pipe 14; a first gas flowmeter 4 is installed on the exhaust pipe to detect the flow rate of the mixed gas after water-gas separation; a second gas flowmeter 7 is installed on the connecting pipe to detect the flow rate of the gas after CO2 gas absorption. The intake pipe 14 is connected to the gas drainage head 1 through a drainage hose 2. The addition of the drainage hose 2 facilitates the position adjustment of the gas drainage head 1, ensuring the drainage detection of the displacement effect for drill holes at different positions; the drain pipe 12 is connected to the main drain pipe 11 to discharge the liquid to the main drain pipe 11 for collection.

[0022] As an improvement of the present utility model, the electronic scale 9 is a precision electronic scale, and a liquid crystal display screen 10 is provided on the precision electronic scale. The use of this device can not only improve the weighing accuracy but also facilitate reading.

[0023] As another improvement of the present utility model, it further includes a leveling partition 16. The gas-liquid separator 13, the gas concentration detector 5, and the electronic scale 9 are all placed on the leveling partition 16, and the leveling partition 16 is used to keep its upper surface horizontal. By maintaining the level, the weighing accuracy of the electronic scale 9 is ensured.

[0024] The above gas-liquid separator 13, CO2 absorber 8, valve 3, gas flowmeter, gas concentration detector 5, and electronic scale 9 are all existing components or devices and can be obtained through market purchase. This application only utilizes their existing functions to achieve the invention purpose of this application.

[0025] Before work, place the present utility model near the borehole to be inspected, and assemble and connect all parts. Then calibrate the electronic scale 9, the first gas flowmeter 4, and the second gas flowmeter 7. After completion, conduct the measurement and inspection of the gas displacement effect. Connect the gas extraction head 1 to the borehole, then open the valve 3 to make the gas extraction negative pressure pipe 6 provide negative pressure to extract the mixed water and gas in the borehole. The extracted mixed water and gas first enter the gas-liquid separator 13 for gas-liquid separation. The separated liquid is discharged from the drain pipe 12, and the separated gas (mainly containing gas, CO2, and N2) enters the CO2 absorber 8 through the exhaust pipe. The first gas flowmeter 4 records in real time the flow rate of the separated gas entering the CO2 absorber 8. The electronic scale 9 records in real time the weight change of the CO2 absorber 8 (i.e., the amount of CO2 gas absorbed can be determined through the weight change). Then the gas is absorbed by the CO2 absorbent liquid 15 in the CO2 absorber 8 to remove the CO2 gas in the mixed gas. Then the removed gas (mainly containing gas and N2) enters the gas concentration detector 5 through the pipeline. The second gas flowmeter 7 records in real time the flow rate of the gas entering the gas concentration detector 5 after removing CO2. The gas concentration detector 5 detects the gas concentration data of the current gas and transports the gas to the gas extraction negative pressure pipe 6. Continuously extract for a set time period to complete the measurement and inspection process of the gas displacement effect. Summarize the data obtained during this time period. According to the amount of CO2 gas and the gas concentration during the extraction inspection process, the gas displacement effect of the borehole can be determined.

[0026] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A precise measurement and testing device for the effect of CO2 / N2 mixed gas displacement of gas, characterized in that: Including gas-liquid separator, CO2 absorber, gas concentration detector and electronic scale; The gas-liquid separator is provided with an air inlet pipe and an exhaust pipe at the top and a drain pipe at the bottom. The air inlet pipe is connected to the gas extraction head and is used to transport the mixed gas and liquid extracted from the borehole to the gas-liquid separator for gas-liquid separation; the drain pipe is used to discharge the separated liquid, and the exhaust pipe is connected to the CO2 absorber and is used to transport the separated mixed gas to the CO2 absorber; The CO2 absorber is placed on an electronic scale, and CO2 absorption liquid is contained inside the scale. The CO2 absorption liquid is used to absorb the CO2 gas in the mixed gas, and the electronic scale is used to weigh the amount of absorbed CO2 gas. An exhaust port is opened on the upper part of the CO2 absorber, and the exhaust port is connected to the air inlet of the gas concentration detector through a connecting pipe, and is used to transport the gas after CO2 gas absorption to the gas concentration detector. The gas concentration detector is used to detect the gas concentration in the gas. The exhaust port of the gas concentration detector is connected to the gas extraction negative pressure pipe, and the gas extraction negative pressure pipe is used to provide extraction negative pressure for the entire device.

2. The precise measurement and testing device according to claim 1, characterized in that: The air inlet pipe is provided with a valve, which controls the gas extraction detection by controlling the on and off of the air inlet pipe; the exhaust pipe is provided with a first gas flow meter, which is used to detect the flow of the mixed gas after water gas separation; the connecting pipe is provided with a second gas flow meter, which is used to detect the flow of the gas after CO2 gas absorption.

3. The precise measurement and testing device according to claim 1, characterized in that: The electronic scale is a precision electronic scale, and a liquid crystal display screen is arranged on the precision electronic scale.

4. The precise measurement and testing device according to claim 1, characterized in that: The air inlet pipe is connected to the gas extraction head through an extraction hose.

5. The precise measurement and testing device according to claim 1, characterized in that: It also includes a leveling partition, on which the gas-liquid separator, the gas concentration detector and the electronic scale are all placed, and the leveling partition is used to keep the upper surface thereof as a horizontal plane.

6. The precise measurement and testing device according to claim 1, characterized in that: The drain pipe is connected to the main drain pipe and is used to discharge the liquid to the main drain pipe for collection.

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