阅读说明：本技术 一种溶液对煤体内瓦斯解吸能力的测定装置及测定方法 (Device and method for measuring gas desorption capacity of solution in coal body ) 是由 徐乐华 刘佳男 姜海纳 于 2019-11-11 设计创作，主要内容包括：本发明公开了一种溶液对煤体内瓦斯解吸能力的测定装置及测定方法,主要应用于煤矿瓦斯灾害防治领域。所述装置由气体供给部分、煤样预处理部分、测定装置部分构成；其中气体供给部分包括高压氦气罐、高压甲烷气罐和减压罐三部分,并通过管路相连接；煤样预处理部分包括真空泵、真空计、超级恒温器、煤样罐、真空干燥箱四部分,测定模块包括第一量筒、第二量筒、水准管、升降器、供液口及阀门。测定方法包括：1)注入溶液；2)测量煤样罐的容积V<Sub>罐</Sub>；3)煤样制备；4)测游离气体空间体积V<Sub>气</Sub>5)煤样吸附甲烷；6)水解吸煤样中的甲烷。本发明测量装置结构简单,方法简便,测定结果准确；可同时测得煤样可吸附瓦斯量和水解吸瓦斯压力。(The invention discloses a device and a method for measuring the gas desorption capacity of a solution in a coal body, which are mainly applied to the field of coal mine gas disaster prevention and control. The device consists of a gas supply part, a coal sample pretreatment part and a measuring device part; the gas supply part comprises a high-pressure helium tank, a high-pressure methane tank and a pressure reduction tank which are connected through pipelines; the coal sample pretreatment part comprises a vacuum pump, a vacuum gauge, a super thermostat, a coal sample tank and a vacuum drying box, and the measuring module comprises a first measuring cylinder, a second measuring cylinder, a leveling pipe, a lifter, a liquid supply port and a valve. The determination method comprises the following steps: 1) injecting a solution; 2) measuring volume V of coal sample tank Pot for storing food (ii) a 3) Preparing a coal sample; 4) measuring the volume V of free gas space Qi (Qi) 5) Adsorbing methane by a coal sample; 6) and (3) hydrolyzing methane in the coal sample. The measuring device has simple structure, simple and convenient method and accurate measuring result; the adsorbable gas quantity and the hydrolytic gas absorption pressure of the coal sample can be measured simultaneously.)

1. The utility model provides a solution is to survey device of gas desorption ability in the coal body which characterized in that: the device consists of a gas supply part, a coal sample pretreatment part and a measuring device part; the gas supply part comprises a high-pressure helium tank, a high-pressure methane tank and a pressure reduction tank which are connected through pipelines; the coal sample pretreatment part comprises four parts, namely a vacuum pump, a vacuum gauge, a super thermostat, a coal sample tank and a vacuum drying oven, wherein the coal sample tank is placed in the super thermostat during measurement and is connected with the vacuum pump through a first three-way valve and a second three-way valve; the measuring module consists of a gas pressure gauge, a first measuring cylinder, a second measuring cylinder, a leveling pipe, a lifter, a liquid supply port and a valve; wherein the first graduated cylinder is communicated with the lower part of the leveling pipe, and the upper part of the leveling pipe is communicated with the gas pipeline through a fifth three-way valve; the bottom of the second measuring cylinder is connected with the coal sample tank through a first three-way valve, and the upper part of the second measuring cylinder is connected with the liquid supply port and the leveling pipe through a fourth three-way valve; the gas pressure gauge is connected with the coal sample tank.

2. The apparatus for determining the desorption capability of a solution on gas in a coal body according to claim 1, wherein: the liquid supply port is used for injecting liquid into the measuring cylinder and the leveling tube before measurement, and the second measuring cylinder or the leveling tube is communicated with the atmosphere in the measurement process.

3. The apparatus for determining the desorption capability of a solution on gas in a coal body according to claim 1, wherein: the gas supply part, the coal sample pretreatment part and the determination device part are connected through a first three-way valve, a second three-way valve, a third three-way valve and a pipeline.

4. The apparatus for determining the desorption capability of a solution on gas in a coal body according to claim 1, wherein: the coal sample tank is 50-100 ml and is cast from 316 stainless steel.

5. The apparatus for determining the desorption capability of a solution on gas in a coal body according to claim 1, wherein: the first measuring cylinder, the second measuring cylinder and the leveling tube are all transparent glass tubes, and the measuring ranges of the first measuring cylinder and the second measuring cylinder are both 100-300 ml.

6. A method for measuring the gas desorption capacity of a solution in a coal body, which adopts the device for measuring the gas desorption capacity of the solution in any one of claims 1 to 5, and is characterized in that: the specific operation steps are as follows:

step 1), solution injection: adjusting the fourth three-way valve to a state that the liquid supply port is communicated with the second measuring cylinder, adjusting the first three-way valve to a state that the second measuring cylinder is not communicated with the coal sample tank, injecting solution into the second measuring cylinder through the liquid supply port, and recording the reading V of the second measuring cylinder at the moment₁(ii) a Then adjusting the fourth three-way valve to a state that the liquid supply port is communicated with the leveling tube, and injecting solution into the leveling tube and the first measuring cylinder through the liquid supply port; finally, the height of the leveling tube is raised through a lifter until the first measuring cylinder is filled with the solution;

step 2), measuring the volume V of the coal sample tank_{Pot for storing food}: the method comprises the following steps of packaging a coal sample tank by using a vacuum adhesive tape, placing the coal sample tank in a super thermostat, adjusting a first three-way valve and a second three-way valve to the position where the coal sample tank is communicated with a vacuum pump, starting the vacuum pump to vacuumize the coal sample tank and a gas air bag, and closing the vacuum pump and the second three-way valve when the pressure in the coal sample tank reaches 2 Pa; opening a valve of the high-pressure helium tank, and adjusting a third three-way valve and a fifth three-way valve to enable the high-pressure helium tank to be communicated with the first measuring cylinder through a decompression tank; the height of the level pipe is reduced through the lifter, helium enters the first measuring cylinder, and the reading V of the first measuring cylinder at the moment is recorded₂Then closing the valve of the high-pressure helium tank and the third three-way valve; then respectively adjusting a first three-way valve, a second three-way valve and a third three-way valve to a first measuring cylinder to be communicated with the coal sample tank in sequence, enabling helium in the first measuring cylinder to enter the coal sample tank, adjusting the height of the leveling tube to enable the liquid level of the first measuring cylinder to be level with the liquid level of the leveling tube, and recording the reading V of the first measuring cylinder at the moment₃(ii) a Finally, the third three-way valve and the leveling pipe valve are closed, so that the first measuring cylinder is communicated with the liquid supply port, the height of the leveling pipe is increased, and redundant helium in the first measuring cylinder is discharged;

according to the steps, the volume V of the coal sample tank_{Pot for storing food}Is the difference between two readings of the first cylinder, i.e. V_{Pot for storing food}=V₃-V₂；

Step 3), preparing a coal sample: weighing m grams of coal sample to be tested, putting the m grams of coal sample into the coal sample tank to be tested in the step 2), packaging the coal sample tank by using a vacuum adhesive tape, and then putting the coal sample tank into a vacuum dryer for drying; after drying, putting the coal sample tank into a super thermostat and connecting the coal sample tank with a pipeline;

step 4), measuring the volume V of the free gas space_{Qi (Qi)}: adjusting the first three-way valve and the second three-way valve to the position where the coal sample tank is communicated with the vacuum pump, starting the vacuum pump to vacuumize the coal sample tank, and closing the vacuum pump and the second three-way valve when the pressure in the coal sample tank reaches 2 Pa; opening a valve of the high-pressure helium tank, and adjusting a third three-way valve and a fifth three-way valve to enable the high-pressure helium tank to be communicated with the first measuring cylinder through a decompression tank;

the height of the level pipe is reduced through the lifter, helium enters the first measuring cylinder, and the reading V of the first measuring cylinder at the moment is recorded₄Then closing the valve of the high-pressure helium tank and the third three-way valve; then respectively adjusting a first three-way valve, a second three-way valve and a third three-way valve to a first measuring cylinder to be communicated with the coal sample tank in sequence, enabling helium in the first measuring cylinder to enter the coal sample tank, adjusting the height of the leveling tube to enable the liquid level of the first measuring cylinder to be level with the liquid level of the leveling tube, and recording the reading V of the first measuring cylinder at the moment₅(ii) a Finally, the third three-way valve and the leveling pipe valve are closed, so that the first measuring cylinder is communicated with the liquid supply port, the height of the leveling pipe is increased, and redundant helium in the first measuring cylinder is discharged; from the above steps, the volume V of the free gas space_{Qi (Qi)}Is the difference between two readings of the first cylinder, i.e. V_{Qi (Qi)}=V₄-V₅；

The volume V of the coal sample can be known_{Coal (coal)}=V_{Pot for storing food}-V_{Qi (Qi)}；

Step 5), adsorbing methane by using a coal sample: readjusting the first three-way valve and the second three-way valve until the coal sample tank is communicated with the vacuum pump, and vacuumizing the coal sample tank until the pressure in the coal sample tank reaches 2 Pa; adjusting a third three-way valve and a fifth three-way valve to enable the pressure reduction tank to be communicated with the first measuring cylinder, and adjusting a valve and a fourth three-way valve to enable the leveling pipe to be communicated with the liquid supply port; opening a high-pressure methane gas tank valve, adjusting the height of the leveling pipe to enable methane gas to enter the first measuring cylinder, and recording the reading V of the first measuring cylinder at the moment₆(ii) a The first three-way valve, the second three-way valve and the third three-way valve are adjusted in sequence to ensure thatThe coal sample tank is communicated with the first measuring cylinder, and methane gas enters the coal sample tank; adjusting the height of the leveling tube to make the liquid level of the first measuring cylinder level with the liquid level of the leveling tube, and recording the reading V of the first measuring cylinder at the moment₇And reading P of gas pressure gauge₁(ii) a According to the steps, the volume V of the methane gas in the coal sample tank_{First of all}Is the difference between two readings of the measuring cylinder, i.e. V_{First of all}=V₆-V₇(ii) a Obtaining the amount Q of the gas adsorbed by the coal sample of unit mass_{Suction device}=(V_{First of all}+V_{Coal (coal)}-V_{Pot for storing food})/m；

Step 6), hydrolyzing methane in the coal absorption sample: adjusting a fourth three-way valve to enable the upper part of the second measuring cylinder to be communicated with the liquid supply port;

adjusting the first three-way valve to communicate the lower part of the second measuring cylinder with the coal sample tank, simultaneously starting a stopwatch to time, and recording the reading V of the second measuring cylinder₈Reading of gas pressure gauge P₂；

The hydrolysis gas absorption pressure is P = P according to the steps₂-P₁。

7. The method for measuring the gas desorption capacity of the solution in the coal body according to claim 6, wherein: the drying temperature of the vacuum drying box is 100 ℃, and the drying duration is 12-15 hours.

8. The method for measuring the gas desorption capacity of the solution in the coal body according to claim 6, wherein: the super-thermostat was heated in a water bath, maintaining the temperature at 30 ℃.

Technical Field

The invention relates to a device and a method for measuring the gas desorption capacity of water and acid-base solution in a coal body, which are mainly applied to the field of coal mine gas disaster prevention and control.

Background

In recent decades, the sudden increase of water inrush accidents in mines seriously threatens the life and property safety of people, and meanwhile, because the water adsorption capacity of coal bodies is stronger than that of gas, mine water disasters can cause the gas in the mines to be outburst and exceed the limit, so that secondary disasters are caused. Therefore, research on the gas desorption capacity of water and acid-base solution in the coal body provides a theoretical basis for preventing and treating mine gas disasters. In addition, the method has important significance for the development of the gas extraction technology.

Disclosure of Invention

The invention aims to provide a device and a method for measuring the gas desorption capacity of a solution in a coal body.

The invention provides a device for measuring the gas desorption capacity of solution in a coal body, which consists of a gas supply part, a coal sample pretreatment part and a measuring device part; the gas supply part comprises a high-pressure helium tank, a high-pressure methane tank and a pressure reduction tank which are connected through pipelines; the coal sample pretreatment part comprises four parts, namely a vacuum pump, a vacuum gauge, a super thermostat, a coal sample tank and a vacuum drying oven, wherein the coal sample tank is placed in the super thermostat during measurement and is connected with the vacuum pump through a first three-way valve and a second three-way valve; the measuring module consists of a gas pressure gauge, a first measuring cylinder, a second measuring cylinder, a leveling pipe, a lifter, a liquid supply port and a valve. Wherein the first graduated cylinder is communicated with the lower part of the leveling pipe, and the upper part is communicated with the gas pipeline through a fifth three-way valve. The bottom of the second measuring cylinder is connected with the coal sample tank through a first three-way valve, and the upper part of the second measuring cylinder is connected with the liquid supply port and the leveling pipe through a fourth three-way valve. The gas pressure gauge is connected with the coal sample tank.

Further, the liquid supply port is used for injecting liquid into the measuring cylinder and the leveling tube before measurement, and is used for communicating the second measuring cylinder or the leveling tube with the atmosphere during measurement.

Furthermore, the gas supply part, the coal sample pretreatment part and the determination device part are connected through a first three-way valve, a second three-way valve, a third three-way valve and a pipeline.

Further, the coal sample tank is 50-100 ml and is cast by 316 stainless steel.

Furthermore, the first measuring cylinder, the second measuring cylinder and the leveling tube are all transparent glass tubes, and the measuring ranges of the first measuring cylinder and the second measuring cylinder are both 100-300 ml.

The invention provides a method for measuring the gas desorption capacity of a solution in a coal body, which comprises the following specific operation steps:

step 1), solution injection: adjusting the fourth three-way valve to a state that the liquid supply port is communicated with the second measuring cylinder, adjusting the first three-way valve to a state that the second measuring cylinder is not communicated with the coal sample tank, then injecting a certain amount of solution into the second measuring cylinder through the liquid supply port, and recording the reading V of the second measuring cylinder at the moment₁(ii) a And then adjusting the fourth three-way valve to a state that the liquid supply port is communicated with the leveling tube, and injecting a certain amount of solution into the leveling tube and the first measuring cylinder through the liquid supply port. Finally, the level tube is raised by the elevator until the first measuring cylinder is filled with the solution.

Step 2), measuring the volume V of the coal sample tank_{Pot for storing food}: the coal sample tank is packaged by a vacuum adhesive tape and placed in a super thermostat, a first three-way valve and a second three-way valve are adjusted to the position where the coal sample tank is communicated with a vacuum pump, the vacuum pump is started to vacuumize the coal sample tank and a gas air bag, and the vacuum pump and the second three-way valve are closed when the pressure in the coal sample tank reaches 2 Pa. And opening a valve of the high-pressure helium tank, and adjusting the third three-way valve and the fifth three-way valve to enable the high-pressure helium tank to be communicated with the first measuring cylinder through the decompression tank. The height of the level pipe is reduced through the lifter, helium enters the first measuring cylinder, and the reading V of the first measuring cylinder at the moment is recorded₂And then the valve of the high pressure helium tank and the third three-way valve are closed. Then respectively adjusting a first three-way valve, a second three-way valve and a third three-way valve to a first measuring cylinder to be communicated with the coal sample tank in sequence, enabling helium in the first measuring cylinder to enter the coal sample tank, adjusting the height of the leveling tube to enable the liquid level of the first measuring cylinder to be level with the liquid level of the leveling tube, and recording the reading V of the first measuring cylinder at the moment₃(ii) a And finally, closing the third three-way valve and the leveling pipe valve to enable the first measuring cylinder to be communicated with the liquid supply port, increasing the height of the leveling pipe and discharging the redundant helium in the first measuring cylinder. According to the steps, the volume V of the coal sample tank_{Pot for storing food}Is the difference between two readings of the first cylinder, i.e. V_{Pot for storing food}=V₃-V₂。

Step 3), preparing a coal sample: weighing m grams of coal sample to be tested, putting the m grams of coal sample into the coal sample tank to be tested in the step 2), packaging the coal sample tank by using a vacuum adhesive tape, and then putting the coal sample tank into a vacuum dryer for drying; and after drying, putting the coal sample tank into a super thermostat and connecting the coal sample tank with a pipeline.

Step 4), measuring the volume V of the free gas space_{Qi (Qi)}: and adjusting the first three-way valve and the second three-way valve to the positions where the coal sample tank is communicated with the vacuum pump, starting the vacuum pump to vacuumize the coal sample tank, and closing the vacuum pump and the second three-way valve when the pressure in the coal sample tank reaches 2 Pa. And opening a valve of the high-pressure helium tank, and adjusting the third three-way valve and the fifth three-way valve to enable the high-pressure helium tank to be communicated with the first measuring cylinder through the decompression tank. The height of the level pipe is reduced through the lifter, helium enters the first measuring cylinder, and the reading V of the first measuring cylinder at the moment is recorded₄And then the valve of the high pressure helium tank and the third three-way valve are closed. Then respectively adjusting a first three-way valve, a second three-way valve and a third three-way valve to a first measuring cylinder to be communicated with the coal sample tank in sequence, enabling helium in the first measuring cylinder to enter the coal sample tank, adjusting the height of the leveling tube to enable the liquid level of the first measuring cylinder to be level with the liquid level of the leveling tube, and recording the reading V of the first measuring cylinder at the moment₅. And finally, closing the third three-way valve and the leveling pipe valve to enable the first measuring cylinder to be communicated with the liquid supply port, increasing the height of the leveling pipe and discharging the redundant helium in the first measuring cylinder. From the above steps, the volume V of the free gas space_{Qi (Qi)}Is the difference between two readings of the first cylinder, i.e. V_{Qi (Qi)}=V₄-V₅；

Further, the volume V of the coal sample is known_{Coal (coal)}=V_{Pot for storing food}-V_{Qi (Qi)}。

Step 5), adsorbing methane by using a coal sample: and readjusting the first three-way valve and the second three-way valve until the coal sample tank is communicated with the vacuum pump, and vacuumizing the coal sample tank until the pressure in the coal sample tank reaches 2 Pa. And adjusting the third three-way valve and the fifth three-way valve to enable the pressure reduction tank to be communicated with the first measuring cylinder, and adjusting the valves and the fourth three-way valve to enable the leveling pipe to be communicated with the liquid supply port. Open, high pressure methane tank valveAdjusting the height of the leveling pipe to enable methane gas to enter the first measuring cylinder, and recording the reading V of the first measuring cylinder at the moment₆. And (3) sequentially adjusting the first three-way valve, the second three-way valve and the third three-way valve to enable the coal sample tank to be communicated with the first measuring cylinder, and enabling methane gas to enter the coal sample tank. Adjusting the height of the leveling tube to make the liquid level of the first measuring cylinder level with the liquid level of the leveling tube, and recording the reading V of the first measuring cylinder at the moment₇And reading P of gas pressure gauge₁. According to the steps, the volume V of the methane gas in the coal sample tank_{First of all}Is the difference between two readings of the measuring cylinder, i.e. V_{First of all}=V₆-V₇. Further, the gas adsorption quantity Q of the unit mass coal sample can be known_{Suction device}=(V_{First of all}+V_{Coal (coal)}-V_{Pot for storing food})/m。

Step 6), hydrolyzing methane in the coal absorption sample: and adjusting the fourth three-way valve to enable the upper part of the second measuring cylinder to be communicated with the liquid supply port. Adjusting the first three-way valve to communicate the lower part of the second measuring cylinder with the coal sample tank, simultaneously starting a stopwatch to time, and recording the reading V of the second measuring cylinder₈Reading of gas pressure gauge P₂。

From the above steps, the hydrolysis gas pressure was P = P₂-P₁。

Further, the drying temperature of the vacuum drying box is 100 ℃, and the drying duration is 12-15 hours.

Further, the super-thermostat was heated in a water bath, and the temperature was maintained at 30 ℃.

The invention has the beneficial effects that:

(1) the measuring device has simple structure, simple method and accurate measuring result;

(2) the invention can determine the desorption capacity of different solutions to the gas in the coal sample by changing the type or the particle size and the solution of the coal sample so as to simulate the desorption capacity of different water qualities to the gas in an actual mine;

(3) the adsorbable gas quantity and the hydrolytic gas absorption pressure of the coal sample can be measured simultaneously.

Drawings

FIG. 1 is a device for measuring the gas desorption capacity of water in a coal body.

In the figure: 1 is high-pressure helium gas pitcher, 2 is high-pressure methane gas pitcher, 3 is the decompression jar, 4 is the vacuum pump, 5 is the vacuometer, 6 is super thermostat, 7 is the coal sample jar, 8 is the gas pressure gauge, 9 is the feed liquor mouth, 10 is first graduated flask, 11 is the air level, 12 is the second graduated flask, 13 is the riser, 14 is first three-way valve, 15 is second three-way valve, 16 is the third three-way valve, 17 is the fourth three-way valve, 18 is the fifth three-way valve, 19 is the air level valve.

Detailed Description

The present invention is further illustrated by, but is not limited to, the following examples.