Downhole gas content analyzer without adding water

Abstract

The invention discloses a water-adding-free underground gas content analyzer in the field of gas content analysis. The water-adding-free underground gas content analyzer comprises a shell. A measuring cylinder and a contrast barrel are arranged on one side in the shell side by side, a first ultrasonic transmitter and a first ultrasonic receiver are arranged at the top and the bottom of the measuring cylinder respectively, and a second ultrasonic transmitter and a second ultrasonic receiver are arranged at the top and the bottom of the contrast barrel respectively. A coal sample chamber is arranged on the right side of the shell; an air outlet of the air blower is connected with a three-way pipe, one end of the three-way pipe is communicated with the coal sample chamber, and the other end of the three-way pipe is communicated with the contrast barrel. The upper end of the coal sample chamber is connected with a connecting pipe, and the other end of the connecting pipe is communicated with the measuring cylinder. The gas content can be measured without adding water, measurement steps are simplified, and measurement errors caused by water are avoided.

Description

Technical Field

[0001] The invention relates to the field of gas content analysis, and in particular to an underground gas content analyzer which does not require water addition. Background Art

[0002] Accurate determination of gas content is crucial for safe production in coal mines, as it is directly related to the risk assessment of coal and gas outbursts and the monitoring of the effectiveness of mine gas control. Traditional gas content analyzers usually require the addition of water to assist certain operations during operation, such as using water to simulate the underground environment or as a medium to promote gas release during gas desorption.

[0003] However, this water addition operation brings a series of inconveniences and problems. First, the water addition step increases the complexity of the operation, making the entire gas content detection process more cumbersome. Secondly, water addition may make equipment maintenance more complicated, because the presence of water may cause corrosion or blockage of the equipment, thereby affecting the stability and service life of the equipment. In addition, the water addition operation may also increase the error of gas content measurement, because the addition of water may affect the desorption behavior of gas, resulting in inaccurate measurement results. Therefore, it is urgent to develop a water-free underground gas content analyzer to solve these problems. Summary of the invention

[0004] The main purpose of the present invention is to provide a water-free underground gas content analyzer to solve the problems mentioned in the background technology.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A water-free underground gas content analyzer comprises a shell. A measuring tube and a control tube are arranged side by side on one side of the inner side of the shell, a first ultrasonic transmitter and a first ultrasonic receiver are arranged on the top and bottom of the measuring tube respectively, and a second ultrasonic transmitter and a second ultrasonic receiver are arranged on the top and bottom of the control tube respectively. A coal sample chamber is arranged on the right side of the shell, and a blower and a vacuum pump are arranged in the shell. A three-way pipe is connected to the air outlet of the blower, one end of the three-way pipe is connected to the coal sample chamber, the other end of the three-way pipe is connected to the control tube, and the exhaust pipe of the vacuum pump is connected to the measuring tube. A connecting pipe is connected to the upper end of the coal sample chamber, and the other end of the connecting pipe is connected to the measuring tube.

[0007] Furthermore, a controller is provided inside the shell.

[0008] Further, the controller is electrically connected to the first ultrasonic transmitter, the first ultrasonic receiver, the second ultrasonic transmitter, the second ultrasonic receiver, the blower and the vacuum pump.

[0009] Furthermore, the measuring cylinder and the control barrel are both sealed structures, a first air pressure sensor is arranged in the measuring cylinder, and a second air pressure sensor is arranged in the control barrel. Both the first air pressure sensor and the second air pressure sensor are electrically connected to the controller.

[0010] Furthermore, a bearing net is provided at the bottom of the coal sample chamber, a feeding port is provided at one side of the coal sample chamber, and a side cover is provided on the feeding port.

[0011] Furthermore, the control barrel is connected to an exhaust pipe.

[0012] Furthermore, an observation window is provided on the shell.

[0013] Furthermore, a display screen is arranged on the front of the shell, and a handle is installed on the top of the shell.

[0014] The present invention also includes other components that enable the water-free underground gas content analyzer to be used normally, and these devices or components all adopt conventional technical means in the art. In addition, the devices and components not limited in the present invention all adopt conventional technical means in the art, such as the first ultrasonic transmitter, the second ultrasonic receiver, etc. in this application. In the specific implementation process, the appropriate device or component model can be selected according to the specific working scenario.

[0015] The working principle of the present invention is: first, start the vacuum pump to evacuate the measuring cylinder. After the evacuation is completed, add coal cuttings into the coal sample chamber from the addition port. Secondly, start the blower, and the blower simultaneously introduces air into the coal sample chamber and the control barrel through the three-way pipe. After the air enters the coal sample chamber, the gas in the coal cuttings is blown into the measuring cylinder through the connecting pipe. After the air pressure in the measuring cylinder and the control barrel is the same, stop blowing, and close the solenoid valves on the pipelines of the measuring cylinder and the control barrel, so that the measuring cylinder and the control barrel are in a sealed state. Finally, start the first ultrasonic transmitter and the second ultrasonic transmitter. Since the measuring cylinder contains gas and the control barrel contains air, the propagation speed of ultrasonic waves in the air and in the gas is different. When the two propagate the same distance, the time used is different, and the difference can reflect the gas concentration.

[0016] Compared with the prior art, the present invention has the following beneficial effects: the gas content can be measured without adding water, the measurement steps are simplified, and the measurement error caused by moisture is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a schematic diagram of the external structure of a downhole gas content analyzer that does not require water addition according to the present invention.

[0018] Figure 2 The present invention is a schematic diagram of the internal structure of a water-free underground gas content analyzer.

[0019] In the figure: 1. outer shell; 2. measuring tube; 21. first ultrasonic transmitter; 22. first ultrasonic receiver; 23. first air pressure sensor; 3. control barrel; 31. second ultrasonic transmitter; 32. second ultrasonic receiver; 33. second air pressure sensor; 34. exhaust pipe; 4. blower; 41. three-way pipe; 5. coal sample room; 51. addition port; 52. side cover; 53. bearing net; 54. connecting pipe; 6. vacuum pump; 61. exhaust pipe; 7. handle; 8. observation window; 9. display screen; 10. controller. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] Example:

[0022] like Figures 1-2 As shown, a water-free underground gas content analyzer includes a housing 1. A measuring tube 2 and a control tube 3 are arranged side by side on one side of the interior of the housing 1. A first ultrasonic transmitter 21 and a first ultrasonic receiver 22 are respectively arranged on the top and bottom of the measuring tube 2, and a second ultrasonic transmitter 31 and a second ultrasonic receiver 32 are respectively arranged on the top and bottom of the control tube 3. A coal sample chamber 5 is arranged on the right side of the housing 1, and a blower 4 and a vacuum pump 6 are arranged in the housing 1. A three-way pipe 41 is connected to the air outlet of the blower 4, one end of the three-way pipe 41 is connected to the coal sample chamber 5, and the other end of the three-way pipe 41 is connected to the control tube 3, and the exhaust pipe 61 of the vacuum pump 6 is connected to the measuring tube 2. A connecting pipe 54 is connected to the upper end of the coal sample chamber 5, and the other end of the connecting pipe 54 is connected to the measuring tube 2.

[0023] In addition, a controller 10 is provided inside the housing 1. The controller 10 is electrically connected to the first ultrasonic transmitter 21, the first ultrasonic receiver 22, the second ultrasonic transmitter 31, the second ultrasonic receiver 32, the blower 4 and the vacuum pump 6. The measuring barrel 2 and the control barrel 3 are both closed structures, the measuring barrel 2 is provided with a first air pressure sensor 23, and the control barrel 3 is provided with a second air pressure sensor 33. The first air pressure sensor 23 and the second air pressure sensor 33 are both electrically connected to the controller 10. The control barrel 3 is connected to an exhaust pipe 34.

[0024] A display screen 9 is provided on the front of the housing 1, and a handle 7 is installed on the top of the housing 1. An observation window 8 is provided on the housing 1. A carrying net 53 is provided at the bottom of the coal sample chamber 5, and a feeding port 51 is provided on one side of the coal sample chamber 5, and a side cover 52 is provided on the feeding port 51.

[0025] Specifically, the models of the first ultrasonic transmitter 21 and the second ultrasonic transmitter 31 are TCT40-16T, the models of the first ultrasonic receiver 22 and the second ultrasonic receiver 32 are TCT40-16R, and the models of the first air pressure sensor 23 and the second air pressure sensor 33 are PX409.

[0026] The working principle of the underground gas content analyzer without water addition of the present invention is as follows: first, the vacuum pump 6 is started to evacuate the measuring tube 2. After the evacuation is completed, coal cuttings are added to the coal sample chamber 5 from the addition port 51. Secondly, the blower 4 is started, and the blower 4 simultaneously introduces air into the coal sample chamber 5 and the control barrel 3 through the three-way pipe 41. After the air enters the coal sample chamber 5, the gas in the coal cuttings is blown into the measuring tube 2 through the connecting pipe 54. After the air pressure of the measuring tube 2 and the control barrel 3 is the same, the air blowing is stopped, and the electromagnetic valves on the pipelines of the measuring tube 2 and the control barrel 3 are closed, so that the measuring tube 2 and the control barrel 3 are in a sealed state. Finally, the first ultrasonic transmitter 21 and the second ultrasonic transmitter 31 are started. Since the measuring tube 2 contains gas and the control barrel 3 contains air, the propagation speed of ultrasonic waves in the air and in the gas is different. When the two propagate the same distance, the time used is different, and the difference can reflect the gas concentration.

[0027] The above embodiments are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope of the present invention.

Claims

1. A water-free underground gas content analyzer, comprising a housing (1), characterized in that: A measuring tube (2) and a control tube (3) are arranged side by side on one side of the inner side of the shell (1); a first ultrasonic transmitter (21) and a first ultrasonic receiver (22) are respectively arranged on the top and bottom of the measuring tube (2); a second ultrasonic transmitter (31) and a second ultrasonic receiver (32) are respectively arranged on the top and bottom of the control tube (3); a coal sample chamber (5) is arranged on the right side of the shell (1); a blower (4) and a vacuum pump (6) are arranged inside the shell (1); a three-way pipe (41) is connected to the air outlet of the blower (4); one end of the three-way pipe (41) is connected to the coal sample chamber (5), and the other end of the three-way pipe (41) is connected to the control tube (3); an exhaust pipe (61) of the vacuum pump (6) is connected to the measuring tube (2); a connecting pipe (54) is connected to the upper end of the coal sample chamber (5), and the other end of the connecting pipe (54) is connected to the measuring tube (2).

2. The underground gas content analyzer without water addition according to claim 1 is characterized in that: A controller (10) is arranged inside the housing (1).

3. The underground gas content analyzer without water addition according to claim 2 is characterized in that: The controller (10) is electrically connected to the first ultrasonic transmitter (21), the first ultrasonic receiver (22), the second ultrasonic transmitter (31), the second ultrasonic receiver (32), the blower (4) and the vacuum pump (6).

4. The underground gas content analyzer without water addition according to claim 2 is characterized in that: The measuring cylinder (2) and the control cylinder (3) are both sealed structures; a first air pressure sensor (23) is provided in the measuring cylinder (2) and a second air pressure sensor (33) is provided in the control cylinder (3); the first air pressure sensor (23) and the second air pressure sensor (33) are both electrically connected to the controller (10).

5. The underground gas content analyzer without water addition according to claim 1 is characterized in that: A bearing net (53) is provided at the bottom of the coal sample chamber (5), a feeding port (51) is provided at one side of the coal sample chamber (5), and a side cover (52) is provided on the feeding port (51).

6. The underground gas content analyzer without water addition according to claim 1, characterized in that: The control barrel (3) is connected to an exhaust pipe (34).

7. The underground gas content analyzer without water addition according to claim 1 is characterized in that: The housing (1) is provided with an observation window (8).

8. The underground gas content analyzer without water addition according to claim 1 is characterized in that: The front of the housing (1) is provided with a display screen (9), and the top of the housing (1) is provided with a handle (7).

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