Device for rapidly measuring gas content

Abstract

The utility model discloses a device for quickly measuring gas content, which comprises a crusher, a desorption unit and a host, the pulverizer comprises a support, a pulverizer material bowl installed in the support, a blade located in the pulverizer material bowl, a pneumatic motor located below the pulverizer material bowl and used for driving the blade to rotate, and a pressure regulating filter installed on the support and connected with the pneumatic motor. The desorption unit comprises a base, a measuring cylinder mounted on the base, and a water level monitoring sensor positioned in the measuring cylinder and used for measuring the displacement of a water level, and a vent valve communicated with a material bowl exhaust port of the crusher material bowl is arranged on the measuring cylinder; a data acquisition device and an ARM single-chip microcomputer which are connected with the water level monitoring sensor through cables are arranged in the host. The device can rapidly measure underground readings, and is convenient to carry, good in stability, high in measurement precision and high in automation degree.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas content measurement, and particularly relates to a device for quickly measuring gas content. Background Technique

[0002] Coal mine gas accidents are one of the major disasters in coal mines. The occurrence status of coal mine gas determines the severity of coal mine gas accidents. Coal seam gas content is one of the main basic parameters of coal mine gas. It determines the gas grade of the mine, the magnitude of the gas emission in the mine, and is also the main index for predicting and identifying the risk of coal and gas outburst in coal seams and mines, as well as for gas drainage and evaluating the risk degree of mine gas disasters.

[0003] The methods for measuring coal seam gas content are divided into direct method and indirect method. The direct method uses a special coal sample collection device. When the coal sample is in its original state, it is loaded into the sampling tank and can be automatically sealed, so that the coal sample always maintains the original gas pressure state. After the coal sample reaches the ground, the desorption method is used to measure the original gas content value of the coal seam. The technological process of measuring coal seam gas content includes the gas loss of the coal sample, the natural desorption gas of the coal sample, the desorption gas of the pulverized coal sample, and the normal pressure adsorption gas of the coal sample. To measure the original gas content of the coal seam by the indirect method, first, the original gas pressure of the coal seam needs to be measured in the mine, and after taking fresh coal samples in the mine, the parameters such as the porosity and adsorption constant of the coal are measured in the laboratory, and then the coal seam gas content is calculated according to the Langmuir equation. This method has the disadvantages of complex process, long measurement period, and high cost. Content of the Utility Model

[0004] Based on the above deficiencies of the prior art, the technical problem solved by the utility model is to provide a device for quickly measuring gas content, which can quickly measure the readings underground, is easy to carry, has good stability, high measurement accuracy, and high automation degree.

[0005] To solve the above technical problem, the utility model is realized through the following technical solutions: The utility model provides a device for quickly measuring gas content, including: a pulverizer, a desorption unit, and a mainframe. The pulverizer includes a bracket, a pulverizer bowl installed in the bracket, a blade located in the pulverizer bowl, a pneumatic motor located below the pulverizer bowl and used to drive the blade to rotate, and a pressure regulating filter installed on the bracket and connected to the pneumatic motor; the desorption unit includes a base, a measuring cylinder installed on the base, a water level monitoring sensor located in the measuring cylinder and used to measure the displacement of the water level, and a ventilation valve provided on the measuring cylinder and communicated with the bowl exhaust port of the pulverizer bowl; inside the mainframe, there is a data acquisition device and an ARM single-chip microcomputer connected to the water level monitoring sensor through a cable.

[0006] Optionally, the pressure regulating filter consists of an oiler, a filter air inlet, a filter air outlet connected to the pneumatic motor, and a pressure regulating valve. The oiler is used to lubricate the blade, and the pressure regulating valve is used to adjust the pressure supplied to the pneumatic motor. The pressure air pipe is connected to the filter air inlet of the pressure regulating filter, and the other end is connected to the matching underground pressure air pipe to provide a power source for the crusher.

[0007] Further, a bracket knob for rotating the crusher bowl is provided on the bracket.

[0008] Optionally, the water level monitoring sensor includes a displacement sensor track and a displacement sensor float moving along the displacement sensor track. The position of the displacement sensor float changes with the change of the water level.

[0009] Optionally, a bowl cover is provided on the top of the crusher bowl. A coal dust filter element is provided on the bowl cover, and a coal dust filter cover is provided on the top of the coal dust filter element.

[0010] The device for quickly measuring the gas content of the present invention at least has the following beneficial effects:

[0011] 1. Put the fresh coal sample collected underground into the crusher, measure the gas desorption amount of the coal sample within a period of time through the highly integrated desorption unit, and the host automatically calculates the gas loss amount and the non-desorbable amount. There are two methods for the non-desorbable amount, one is calculation, and the other is to calculate by measuring the desorption amount after crushing. Finally, the gas content in the coal sample is obtained.

[0012] 2. The device for quickly measuring the gas content of the present invention is easy to carry, automatically times, automatically calculates the gas content, automatically stores and transmits data. All data can be displayed in real time on the liquid crystal screen. The gas content measurement can be completed quickly within thirty minutes, and the result can be directly obtained underground without the need to lift the well for operation.

[0013] 3. The measured data of the device for quickly measuring the gas content of the present invention is continuous, that is, a continuous gas desorption curve can be measured.

[0014] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following is described in detail with reference to the preferred embodiments and in conjunction with the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0016] Figure 1Schematic diagram of the structure of the device for rapidly measuring gas content of the present utility model;

[0017] Figure 2 Schematic diagram of the structure of the crusher of the present utility model;

[0018] Figure 3 Schematic diagram of the structure of the desorption unit of the present utility model;

[0019] Figure 4 Flow chart of the usage method of the device for rapidly measuring gas content of the present utility model.

[0020] In the figure, 1. Hopper exhaust port, 2. Crusher hopper, 3. Pressure regulating filter air inlet, 4. Compressed air pipe, 5. Silicone tube, 6. Measuring cylinder, 7. Ventilation valve, 8. Air inlet, 9. Cable, 10. Main unit, 11. Pneumatic motor, 12. Pressure regulating filter, 13. Bracket, 14. Bracket knob, 15. Hopper cover, 16. Coal dust filter element, 17. Coal dust filter cover, 18. Pressure regulating valve, 19. Pressure gauge, 20. Blade, 21. Measuring cylinder, 22. Displacement sensor track, 23. Displacement sensor float, 24. Water outlet, 25. Base, 26. Water injection port cover. Detailed implementation manners

[0021] The following will describe in detail the specific implementation manners of the present utility model in conjunction with the accompanying drawings. As a part of this specification, the principles of the present utility model are illustrated through examples. Other aspects, features, and advantages of the present utility model will become clear at a glance through this detailed description. In the accompanying drawings referred to, the same or similar components in different figures are denoted by the same reference numerals.

[0022] As Figures 1-4 shown, the device for rapidly measuring gas content of the present utility model includes: a crusher, a desorption unit, and a main unit.

[0023] As Figure 2As shown in the figure, the crusher includes a bracket 13, a crusher bowl 2 installed in the bracket 13, a blade 20 located in the crusher bowl 2, a pneumatic motor 11 located below the crusher bowl 2 and used to drive the blade 20 to rotate, and a pressure regulating filter 12 installed on the bracket 13 and connected to the pneumatic motor 11. The pressure regulating filter 12 consists of an oiler, a filter air inlet 3, a filter air outlet connected to the pneumatic motor 11, and a pressure regulating valve 18. The pressure regulating valve 18 is used to adjust the pressure supplied to the pneumatic motor 11. The oiler plays a role in maintaining the blade 20, provides lubrication for the blade 20, extends the service life of the crusher and improves work efficiency. The filter air outlet uses differential pressure exhaust. When the pressure regulating valve 18 adjusts the pressure supplied to the pneumatic motor 11, it gradually and evenly adjusts to the required pressure value. A pressure gauge 19 is installed on the pressure regulating valve 18. The bracket 13 provides a solid foundation and stable support for the crusher, enabling it to remain stable during operation. A bracket knob 14 for rotating the crusher bowl 2 is provided on the bracket 13. The bracket knob 14 needs to rotate the crusher bowl 2 during experiments to achieve the effect of fully crushing the coal sample. The pneumatic motor 9 provides power for the blade 20 in the crusher bowl 2 to crush the coal sample.

[0024] A bowl cover 15 is provided at the top of the crusher bowl 2, and a coal dust filter element 16 is provided on the bowl cover 15. A coal dust filter cover 17 is provided at the top of the coal dust filter element 16.

[0025] The desorption unit includes a base 25, a measuring cylinder 21 installed on the base 25, and a water level monitoring sensor located in the measuring cylinder 21 and used to measure the displacement of the water level. A ventilation valve 7 connected to the bowl exhaust port 1 of the crusher bowl 2 through a silica gel tube 5 is provided on the measuring cylinder 21, and the ventilation valve 7 is connected to the air inlet 8 of the measuring cylinder 21. The base 25 plays a role in protecting the measuring cylinder 21. The interior of the measuring cylinder 21 contains a water level monitoring sensor. The water level monitoring sensor includes a displacement sensor track 22 and a displacement sensor float 23 that moves along the displacement sensor track 22. The position of the float changes with the change of the water level. The water level monitoring sensor can measure the displacement of the water level by monitoring the position of the float. The water level monitoring sensor is used to indirectly detect the gas content in the coal sample. The water level monitoring sensor records the water level line during the gas desorption process of the underground coal sample in real time. The desorption amount is converted into the gas content of the coal sample by the ARM single-chip microcomputer inside the host computer through the water level change data transmitted by the data line.

[0026] The host 10 is composed of a data acquisition device, an ARM single-chip microcomputer, a display unit and a power module. The data acquisition device is connected to a water level monitoring sensor by a data acquisition card. The water level monitoring sensor usually outputs an analog signal, and the digital system requires a digital signal, so data is obtained from the water level monitoring sensor and passed to the ARM single-chip microcomputer through processing and transmission means. The ARM single-chip microcomputer is located inside the host 10, including an ARM processor core, memory, interrupt controller, peripheral interface, etc. The display unit can display the gas desorption curve, gas content, loss amount, desorption amount and non-desorbable amount.

[0027] The desorption unit is highly integrated, forming a compact and efficient unit with the base 25, the measuring cylinder 21, the sensor, etc. The water level monitoring sensor has high precision, fast response, good stability and easy maintenance. The displacement sensor track 22 is designed as a guide rail fixed inside the measuring cylinder 21, and its length matches the height of the measuring cylinder 21 to ensure that all possible water level changes can be covered. The water level monitoring sensor has a high resolution and can accurately monitor tiny water level changes. The design of the displacement sensor float 23 takes into account the anti-interference ability and reduces the influence of the external environment on the measurement results. The surface of the displacement sensor track 22 is specially treated to reduce friction and improve the smoothness of the float movement.

[0028] The host 10 can directly provide accurate gas content data on site underground, eliminating the need to transport coal samples to a surface laboratory, greatly shortening the measurement cycle and reducing the total measurement time to less than 30 minutes. The host 10 can not only automatically read, but also record and calculate data in real time, ensuring the accuracy and reliability of the results while reducing the burden on staff;

[0029] The device of the utility model is easy to carry and operate, and the total weight is controlled below 10 kilograms, which achieves significant weight reduction compared with the heavy traditional device of several hundred kilograms;

[0030] The data acquisition device and ARM microcontroller inside the host 10 have a high degree of automation, automatic timing, automatic calculation of gas content, gas loss, gas desorption / residual amount, non-desorption amount, gas pressure (reverse method), and data can be displayed in real time, automatically stored, browsed, and transmitted;

[0031] The utility model is a device for rapidly measuring gas content. The residual gas amount can be calculated by a formula or obtained by measuring the desorption amount during pulverization by a pulverizer. A set of automatic data reading and analysis software has been developed to realize rapid calculation of coal seam gas content and gas pressure, generate measurement reports, and transmit wirelessly.

[0032] In addition, the method for using the device for quickly measuring gas content of the utility model comprises the following steps:

[0033] Step 1: Press the machine's power hard switch and soft switch in sequence. Connect the cable 9 of the desorption unit to the main unit 10;

[0034] Step 2: Press the key to select "Gas Content Measurement" according to the prompt, enter the coal sample number by pressing the key, select the coal seam to be measured, and press "Confirm" to proceed to the next step;

[0035] Step 3: When the drilling position reaches the position to be measured, press the key to start timing (i.e., it is considered that the coal sample starts to be exposed), and the coal-seeing time can be adjusted and corrected. At this time, it is necessary to complete the injection of clear water: tighten the ventilation valve 7, block the water outlet 24 with your finger, inject clear water into the measuring cylinder 21, screw on the water injection port cover 26 and then release your finger, and press the key to indicate that this process is completed. The height of the clear water injection should not exceed the 0 scale line;

[0036] Step 4: Prepare for desorption. After the coal cuttings or coal core are taken out, start loading the sample. Sieve out 100 g of coal sample with a particle size of 1 - 10 mm and load it into the crusher hopper 2, tighten the hopper cover 15, open the ventilation valve 7, and quickly press the "Confirm" key to start desorbing gas;

[0037] Step 5: Curve display: The instrument screen displays information such as the gas desorption curve, temperature, time, air column height, etc. If the single water volume is not enough during the test, you can press the key to inject water. After injecting water, press the key again and continue desorbing. Interrupt the test. During the measurement of the desorption curve, if you want to abandon the experiment, you can press the key to exit the test. When the test ends and the normal desorption process reaches the set time, the measurement result is displayed and the measurement ends. If the measurement mode is the crushing mode, start the crusher 3 minutes after desorption and continue desorbing, and it ends in about 30 minutes.

[0038] The particle size of the experimental coal sample is 1 - 10 mm and the mass is 100 g.

[0039] Connect the pressure air pipe 4 to the pressure regulating filter air inlet 3 of the pressure regulating filter 12, and connect the other end to the underground pressure air pipeline that matches it to provide a power source for the crusher. The other end of the pressure regulating filter 12 is connected to the pneumatic motor 9, and the pressure air pressure must be in the range of 0.2 - 0.6 MPa.

[0040] Crushing process of the crusher: After the pipelines of each part are connected, start the underground pressure air switch, open the switch of the pressure regulating filter 12, fine-tune the switch, adjust the air pressure to about 0.2 - 0.6 MPa, and crush the coal particles through the blade 20 in the crusher hopper 2. Rotate the crusher hopper 2 in real time during the test to avoid damage to the blade caused by coal particles getting stuck. In addition, it is not necessary to keep the crusher running all the time during the test, and it can be switched on and off multiple times until the liquid level in the measuring cylinder in the desorption unit does not change, which is regarded as the end of the crushing process.

[0041] If the crushing mode is selected, the gas content can be measured quickly within 30 minutes, and the results can be obtained directly underground.

[0042] The gas desorption volume converted to the gas desorption volume under standard conditions is:

[0043]

[0044] In the formula, V t0 is the gas volume after the gas desorption amount is converted to the standard state, mL; V t is the gas volume reading in the graduated cylinder at time t, mL; p0 is the atmospheric pressure, Pa; T w is the water temperature in the graduated cylinder; h w is the water column height in the graduated cylinder, mm; p t is the saturated vapor pressure of water at time t, Pa.

[0045] The atmospheric pressure adsorption amount shows a logarithmic curve decay with the degree of coal metamorphism, and the quantitative relationship is:

[0046] Q0 = -3.962lnV daf +14.684 (2)

[0047] In the formula, Q0 is the atmospheric pressure adsorption amount, cm 3 / g; V daf is the volatile matter, %.

[0048] This model does not include parameters such as gas adsorption constants, true density, apparent density, and porosity, and is only related to three parameters: the volatile matter, moisture, and ash of coal. The non-desorbable amount under atmospheric pressure is calculated according to the following formula:

[0049]

[0050] In the formula, X b is the non-desorbable gas amount of coal under standard atmospheric pressure, cm 3 / g; A ad is the ash of coal, %; M ad is the moisture of coal, %; V daf is the volatile matter, %.

[0051] The non-desorbable amount under atmospheric pressure is calculated by measuring the desorption amount after crushing:

[0052] X0 = X1 - (X2 + X3) (4)

[0053] In the formula, X0 is the non-desorbable gas amount of coal under standard atmospheric pressure, cm 3 / g; X1 is the gas content of the coal sample before crushing, cm 3 / g; X2 is the gas content of natural desorption before crushing, cm 3 / g; X3 is the gas content after natural desorption after crushing, cm 3 / g.

[0054] According to the desorption amount measured by the instrument, the formula is:

[0055]

[0056] In the formula, Q is the gas desorption amount, cm 3 / g; q0 is the gas desorption rate at t = 0, cm 3 / (g·min); t is the gas desorption time, min; n is the attenuation coefficient of the gas desorption rate varying with time. Draw the gas desorption curve, and calculate the loss amount according to the gas desorption curve of the coal sample before crushing by natural desorption.

[0057] The above is the preferred implementation manner of the present invention. Of course, the scope of rights of the present invention cannot be limited thereby. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and changes can be made, and these improvements and changes are also regarded as the protection scope of the present invention.

Claims

1. A device for quickly measuring gas content, comprising: A pulverizer, a desorption unit, and a main machine, wherein the pulverizer comprises a bracket, a pulverizer bowl mounted in the bracket, a blade located in the pulverizer bowl, an air motor located below the pulverizer bowl and used to drive the blade to rotate, and a pressure regulating filter mounted on the bracket and connected to the air motor; The desorption unit comprises a base, a measuring cylinder mounted on the base, and a water level monitoring sensor located in the measuring cylinder and used to measure the displacement of the water level, wherein the measuring cylinder is provided with a vent valve connected to the bowl exhaust port of the pulverizer bowl; The host is internally provided with a data acquisition device and an ARM single chip microcomputer connected with the water level monitoring sensor via a cable.

2. The device for quickly measuring gas content according to claim 1, characterized in that: The pressure regulating filter consists of an oil mist collector, a filter air inlet, a filter exhaust port connected to the pneumatic motor, and a pressure regulating valve. The oil mist collector is used to provide lubrication for the blade, and the pressure regulating valve is used to adjust the pressure supplied to the pneumatic motor. The compressed air pipe is connected to the air inlet of the pressure regulating filter, and the other end of the compressed air pipe is connected to a matching compressed air pipeline underground to provide a power source for the crusher.

3. The device for quickly measuring gas content according to claim 1, characterized in that: The bracket is provided with a bracket knob for rotating the pulverizer bowl.

4. The device for quickly measuring gas content according to claim 1, characterized in that: The water level monitoring sensor comprises a displacement sensor track and a displacement sensor float moving along the displacement sensor track, and the position of the displacement sensor float changes with the change of the water level.

5. The device for quickly measuring gas content according to claim 1, characterized in that: A bowl cover is arranged on the top of the pulverizer bowl, a coal dust filter core is arranged on the bowl cover, and a coal dust filter cover is arranged on the top of the coal dust filter core.

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