One-cylinder double-range gas content desorption instrument

Abstract

According to the double-range gas content desorption instrument provided by the utility model, the gas content in a coal seam is measured by using the sensor, the two measuring cylinders with different ranges are used for correspondingly detecting, and the gas volume is determined by using a drainage method. The flow directions of gas and water in the whole device are changed through the first three-way valve and the second three-way valve, and when the gas content in a coal seam is low, the first measuring cylinder is used for measurement; when the gas content in the coal seam is high, the second measuring cylinder is used for measurement, and the gas content is better matched with the measuring range of the measuring cylinder, so that the reading is more accurate, and the detection precision is further improved. And meanwhile, the applicability of the whole device is improved, and the device is suitable for industrial large-scale use and popularization.

Description

Technical Field

[0001] The utility model belongs to the field of coal seam gas content measurement, in particular to a one-tube dual-range gas content desorption instrument. Background Art

[0002] The determination of coalbed methane (coal mine gas) content is an important task in the fields of coalbed methane resource exploration, development and comprehensive mine gas control. Accurately obtaining coalbed methane content data is of great significance for evaluating coalbed methane resources, formulating coalbed methane resource development plans, and mine mining design, mine ventilation, and comprehensive gas disaster control; coalbed methane content also represents the ability of coalbed methane (gas) in the form of adsorption in coal reservoirs, and is also an important parameter for reservoir evaluation.

[0003] At present, the gas content in underground coal mines is mainly measured by directly collecting coal samples at the working face and loading them into gas tanks, connecting gas content instruments, and reading the volume of gas escaped; the coalbed methane content on the ground is measured by coring the coal reservoir with ropes drilled on the ground, and then loading them into desorption tanks on the ground, connecting gas content instruments, and obtaining the gas volume. Therefore, a gas volume measuring instrument is used in this gas content testing method. At present, the gas content in coal seams varies greatly, with some being around tens of milliliters and some reaching hundreds of milliliters. The range of gas desorption instruments in the prior art cannot meet the requirements for measuring the gas content in coal seams. When applied to coal seams with different gas contents, the applicability is poor and the detection accuracy is low. Utility Model Content

[0004] The utility model aims to provide a one-cylinder dual-range gas content desorption instrument to solve the problems of poor applicability and low detection accuracy of the gas desorption instrument in the prior art.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A one-cylinder dual-range gas content desorption instrument comprises a first measuring cylinder and a second measuring cylinder, wherein the measuring range of the first measuring cylinder is not equal to the measuring range of the second measuring cylinder.

[0007] The tops of the first measuring cylinder and the second measuring cylinder are respectively provided with exhaust pipes, and the corresponding exhaust pipes are respectively provided with the first exhaust valve and the second exhaust valve; the lower parts of the first measuring cylinder and the second measuring cylinder are respectively provided with the first drain pipe and the second drain pipe; the lower parts of the first measuring cylinder and the second measuring cylinder are respectively provided with the first air inlet pipe and the second air inlet pipe.

[0008] The first air inlet pipe and the second air inlet pipe are respectively connected to the two ends of the first three-way valve, and the third end of the first three-way valve is connected to the third air inlet pipe through a pressure sensor; the first drain pipe and the second drain pipe are respectively connected to the two ends of the second three-way valve, and the third end of the second three-way valve is connected to the bottom end of the water storage bottle through the first drain pipe; the bottom end of the water storage bottle is also connected to the third drain pipe, and the upper end of the third drain pipe enters the water storage bottle and is close to the inner wall of the top end of the water storage bottle.

[0009] The utility model also has the following features:

[0010] Furthermore, the second measuring cylinder is installed on the bracket, and the first measuring cylinder is fixedly installed on the upper end of the second measuring cylinder.

[0011] Furthermore, the measuring ranges of the first measuring cylinder and the second measuring cylinder are 100 ml and 500 ml respectively.

[0012] Furthermore, the scale lines of the first measuring cylinder and the second measuring cylinder are distributed from top to bottom.

[0013] Furthermore, the pressure sensor is a temperature pressure sensor.

[0014] Furthermore, the water storage bottle is in a conical shape, and the conical portion of the water storage bottle serves as the bottle mouth and is arranged downward.

[0015] Furthermore, the first measuring cylinder and the second measuring cylinder are both organic tempered glass measuring cylinders.

[0016] Furthermore, the first three-way valve and the second three-way valve are both stainless steel three-way valves.

[0017] Compared with the prior art, the utility model has the following technical effects:

[0018] The utility model has a dual-range gas content desorption instrument with one cylinder, which uses a sensor to measure the gas content in the coal seam, and uses two measuring cylinders with different ranges to detect the gas content in the coal seam, and uses the drainage method to determine the gas volume. The flow direction of the gas and water in the overall device is changed by the first three-way valve and the second three-way valve. When the gas content in the coal seam is low, the first measuring cylinder is used for measurement; when the gas content in the coal seam is high, the second measuring cylinder is used for measurement. Since the gas content and the measuring cylinder range are better matched, the reading is more accurate, thereby improving the accuracy of the detection. At the same time, the applicability of the overall device is improved, and it is suitable for large-scale use and promotion in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a one-tube dual-range gas content desorption instrument of the utility model;

[0020] Figure 2It is a schematic diagram of the measuring range of the first measuring cylinder and the second measuring cylinder of the utility model.

[0021] The meanings of the numbers in the figure are: 1. first measuring cylinder; 2. second measuring cylinder; 3. first exhaust valve; 4. second exhaust valve; 5. first drain pipe; 6. second drain pipe; 7. first air inlet pipe; 8. second air inlet pipe; 9. first three-way valve; 10. sensor; 11. third air inlet pipe; 12. second three-way valve; 13. first drain pipe; 14. water storage bottle; 15. third drain pipe. DETAILED DESCRIPTION

[0022] It should be noted that, unless otherwise specified, all components in the present invention are components known in the prior art, for example, sensors are known and commonly used sensors.

[0023] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of the present application fall within the protection scope of the present invention.

[0024] A one-cylinder dual-range gas content desorption instrument comprises a first measuring cylinder 1 and a second measuring cylinder 2, wherein the measuring range of the first measuring cylinder 1 is not equal to the measuring range of the second measuring cylinder 2.

[0025] Exhaust pipes are respectively provided at the upper ends of the first measuring cylinder 1 and the second measuring cylinder 2, and the corresponding exhaust pipes are respectively provided with the first exhaust valve 3 and the second exhaust valve 4; the first drain pipe 5 and the second drain pipe 6 are respectively provided at the bottom ends of the first measuring cylinder 1 and the second measuring cylinder 2; the first air intake pipe 7 and the second air intake pipe 8 are respectively provided on the first measuring cylinder 1 and the second measuring cylinder 2, and the first air intake pipe 7 and the second air intake pipe 8 are respectively connected to the two ends of the first three-way valve 9, and the third end of the first three-way valve 9 is connected to the third air intake pipe 11 through the sensor 10.

[0026] The first drain pipe 5 and the second drain pipe 6 are respectively connected to the two ends of the second three-way valve 12, and the third end of the second three-way valve 12 is connected to the bottom end of the water storage bottle 14 through the first drain pipe 13; the bottom end of the water storage bottle 14 is also connected to the third drain pipe 15, and the upper end of the third drain pipe 15 enters the water storage bottle 14 and is close to the inner wall of the top end of the water storage bottle 14.

[0027] Before use, fill each measuring cylinder with water and close the corresponding exhaust valve after it is filled with water.

[0028] When in use, the coal sample collected from the underground is quickly loaded into the external device, and the external device is connected to the third air inlet pipe 11. At this time, coalbed methane enters the sensor 10 from the external device, and the sensor 10 detects the gas pressure, with 0.3MPa as the limit.

[0029] When the pressure is greater than 0.3MPa, it indicates that the coalbed methane content is rich in the area. The first three-way valve 9 is adjusted to allow the coalbed methane to enter the second measuring cylinder 2. At the same time, the second exhaust valve 4 is closed; the second three-way valve 12 is adjusted to allow the water in the second measuring cylinder 2 to enter the water storage bottle 14 through the second drainage pipe 6. At this time, the coalbed methane enters the second measuring cylinder 2 from the external device, and after the corresponding volume of water is discharged, the liquid level reading of the second measuring cylinder 2 is read and recorded, and the reading is the volume of the coalbed methane.

[0030] After the above operation is completed, close the first three-way valve 9, open the second exhaust valve 4, lift the water storage bottle 14, and let the water flow back into the second measuring cylinder 2 until the liquid level returns to the position of the 0 scale line, and then the next experiment can be carried out.

[0031] Similarly, if the pressure is less than 0.3 MPa, the conduction direction of the corresponding three-way valve can be changed according to the above method, and the first measuring cylinder 1 can be used for the experiment.

[0032] Specifically, the measuring ranges of the first measuring cylinder 1 and the second measuring cylinder 2 are 100 ml and 500 ml respectively.

[0033] As a preferred solution of this embodiment, the scale lines of the first measuring cylinder 1 and the second measuring cylinder 2 are distributed from top to bottom. Since the device adopts the displacement method to measure the gas volume, this setting is more convenient for reading.

[0034] As a preferred solution of this embodiment, the second measuring cylinder 2 is mounted on the bracket, and the first measuring cylinder 1 is integrally mounted on the upper end of the second measuring cylinder 2. The connection strength between the components is enhanced.

[0035] As a preferred solution of this embodiment, the sensor 10 is a temperature and pressure sensor. During the experiment, the gas temperature is an important indicator. Ideally, the gas temperature during the experiment is close to the temperature in the coal seam. The temperature and pressure sensor is used to monitor the test temperature while detecting the pressure. When the gas cools and the temperature is low, the experiment is repeated in time, which is conducive to improving the accuracy of the experiment.

[0036] As a preferred solution of this embodiment, the water storage bottle 14 is in a conical shape, and the conical portion of the water storage bottle 14 is arranged downward as a bottle mouth. The conical bottle has a stable structure and a small bottle mouth, and the liquid is not easy to splash out or evaporate.

[0037] As a preferred solution of this embodiment, the first measuring cylinder 1 and the second measuring cylinder 2 are both organic tempered glass measuring cylinders. The first three-way valve 9 and the second three-way valve 12 are both stainless steel three-way valves, making the device light, strong and durable.

Claims

1. A one-tube dual-range gas content desorption instrument, characterized in that: It comprises a first measuring cylinder (1) and a second measuring cylinder (2), wherein the measuring range of the first measuring cylinder (1) is not equal to the measuring range of the second measuring cylinder (2); The tops of the first measuring cylinder (1) and the second measuring cylinder (2) are respectively provided with exhaust pipes, and the corresponding exhaust pipes are respectively provided with a first exhaust valve (3) and a second exhaust valve (4); the lower parts of the first measuring cylinder (1) and the second measuring cylinder (2) are respectively provided with a first drain pipe (5) and a second drain pipe (6); A first air inlet pipe (7) and a second air inlet pipe (8) are respectively provided through the lower parts of the first measuring cylinder (1) and the second measuring cylinder (2); The first air inlet pipe (7) and the second air inlet pipe (8) are respectively connected to the two ends of the first three-way valve (9), and the third end of the first three-way valve (9) is connected to the third air inlet pipe (11) via a pressure sensor (10); the first drainage pipe (5) and the second drainage pipe (6) are respectively connected to the two ends of the second three-way valve (12), and the third end of the second three-way valve (12) is connected to the bottom end of the water storage bottle (14) via the first drainage pipe (5); the bottom end of the water storage bottle (14) is also connected to the third drainage pipe (15), and the upper end of the third drainage pipe (15) enters the water storage bottle (14) and is close to the inner wall of the top end of the water storage bottle (14).

2. The one-cylinder dual-range gas content desorption instrument as claimed in claim 1, characterized in that: The second measuring cylinder (2) is installed on the bracket, and the first measuring cylinder (1) is fixedly installed on the upper end of the second measuring cylinder (2).

3. The one-cylinder dual-range gas content desorption instrument as claimed in claim 2, characterized in that: The measuring ranges of the first measuring cylinder (1) and the second measuring cylinder (2) are 100 ml and 500 ml respectively.

4. The one-cylinder dual-range gas content desorption instrument as claimed in claim 3, characterized in that: The scale lines of the first measuring cylinder (1) and the second measuring cylinder (2) are both distributed from top to bottom.

5. The one-cylinder dual-range gas content desorption instrument as claimed in claim 1, characterized in that: The pressure sensor (10) is a temperature pressure sensor.

6. The one-cylinder dual-range gas content desorption instrument as claimed in claim 1, characterized in that: The water storage bottle (14) is in a conical shape, and the conical portion of the water storage bottle (14) serves as a bottle mouth and is arranged downward.

7. A one-tube dual-range gas content desorption instrument as claimed in any one of claims 1 to 6, characterized in that: The first measuring cylinder (1) and the second measuring cylinder (2) are both organic tempered glass measuring cylinders.

8. The one-cylinder dual-range gas content desorption instrument as claimed in claim 7, characterized in that: The first three-way valve (9) and the second three-way valve (12) are both stainless steel three-way valves.

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