CN110865006B - Device and method for measuring liquid absorption rate of coal or rock mass - Google Patents
Device and method for measuring liquid absorption rate of coal or rock mass Download PDFInfo
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Abstract
本发明公开了一种煤或岩体吸液速率测定装置及测定方法。该测定装置由氦气供给模块、试样预处理模块、测定模块组成；其中氦气供给模块由高压氦气瓶和减压罐两部分组成，试样预处理模块包括真空泵、压力表、超级恒温器、煤样罐、真空干燥箱五部分，测定时煤样罐放置在超级恒温器中，并与真空泵通过第一三通阀门相连接。测定方法包括：注入液体、测量煤样罐的容积V罐、试样制备、测游离气体空间体积V气、测量煤样的吸水速率v、消除煤样颗粒间空隙的影响及重复测定消除误差。本发明消除了气体体积、水压、环境温度、煤样颗粒间空隙等无关因素对测定结果的影响；步骤可量化为标准化操作，能减少测试过程中人为的误差。
The invention discloses a coal or rock mass liquid absorption rate measuring device and a measuring method. The measuring device consists of a helium supply module, a sample pretreatment module, and a measurement module; the helium supply module is composed of a high-pressure helium cylinder and a decompression tank, and the sample pretreatment module includes a vacuum pump, a pressure gauge, and a super constant temperature. During the measurement, the coal sample tank is placed in the super thermostat and connected with the vacuum pump through the first three-way valve. The determination method includes: injecting liquid, measuring the volume V of the coal sample tank , sample preparation, measuring the free gas space volume V gas , measuring the water absorption rate v of the coal sample, eliminating the influence of the gap between the coal sample particles, and repeating the measurement to eliminate errors. The invention eliminates the influences of irrelevant factors such as gas volume, water pressure, ambient temperature, and gap between coal sample particles on the measurement results; the steps can be quantified as standardized operations, which can reduce human errors in the testing process.
Description
Technical Field
The invention relates to a device and a method for measuring the liquid absorption rate of coal or rock mass, which are mainly used for researching the liquid absorption process and the liquid absorption rate of the coal or rock mass and belong to the technical field of rock mass hydraulics measurement.
Background
In recent decades, the life and property safety of people is seriously threatened by the sudden increase of mine water inrush accidents, the mine water inrush accidents are closely related to the water absorption of coal and rock masses, and the analysis of the water absorption capacity and the water absorption rate of different coals and rock masses has important significance for researching the water absorption characteristics, the strength characteristics and the microstructure of the coals and rock masses, so that a theoretical basis is provided for solving the mine water inrush accidents. At present, in the aspect of measuring the water absorption process of coal and rock masses, a weighing method is adopted, namely, a dried sample is soaked in water for a certain time and then taken out for weighing, then is soaked in water again, and is taken out again for weighing after a period of time until the weight is not increased any more. Although this method can measure the water absorption process of a sample, there are three main problems, firstly, the continuity of the water absorption process of the sample cannot be ensured, which is inconsistent with the actual situation, secondly, the surface layer and structure of the sample are likely to be artificially damaged due to the need to repeatedly take out, weigh and put in the rock from the water, and thirdly, the water absorption time is generally shortened due to the relatively large water absorption strength of the sample at the initial stage of the measurement, in which case it is difficult to ensure the accuracy of the water absorption time.
Disclosure of Invention
The invention aims to provide an accurate and effective coal or rock mass liquid absorption rate measuring device and a measuring method.
The measuring principle of the invention is to accurately measure the liquid suction rate of the coal sample or the rock sample according to the liquid level change condition of the measuring cylinder after the coal sample or the rock sample is sucked in a vacuum state.
The invention provides a coal rock liquid absorption rate measuring device, which consists of a helium gas supply module, a sample pretreatment module and a measuring module; the helium supply module consists of a high-pressure helium tank and a pressure reduction tank which are connected through a pipeline; the sample pretreatment module comprises a vacuum pump, a pressure 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; the measuring module comprises a liquid feeding pipe, a liquid supply port, a first measuring cylinder, a second measuring cylinder, a third measuring cylinder, a fourth measuring cylinder, a corresponding lifter and a corresponding valve; the four measuring cylinders are connected in parallel and are respectively connected with the liquid supply ports, the liquid supply pipe is used for supplying liquid to the coal sample tank, the measuring cylinders are used for measuring the volume of the liquid supply amount, the lifters are used for adjusting the heights of the corresponding measuring cylinders so as to enable the liquid level of the measuring cylinders to be equal to that of the liquid supply pipe, and the liquid supply ports are communicated with the atmosphere so as to enable the atmosphere pressure to be maintained in the measuring cylinders. The liquid supply port is used for injecting liquid into the liquid supply tube and the measuring cylinder before the measurement is started.
Furthermore, valves are respectively arranged on the pipelines above and below each measuring cylinder; each measuring cylinder is provided with a lifter, and the height of the measuring cylinder can be adjusted so as to adjust the height of the liquid level.
Furthermore, the helium supply module and the sample pretreatment module are connected through a first three-way valve, a second three-way valve and a pipeline; the helium supply module and the measuring module are connected with each other through a third three-way valve, a second three-way valve and a pipeline; and three interfaces of the third three-way valve are respectively connected with the helium supply module, the liquid supply pipe and the liquid supply port.
Furthermore, the coal sample tank of the coal sample tank is composed of a tank body and a tank cover, an air hole is formed in the tank cover and connected with an air supply pipeline, a sealing ring is arranged inside the tank cover, the tank body and the tank cover are sealed through screw threads, the sealing ring and a vacuum adhesive tape, the volume of the coal sample tank is 50ml, and the coal sample tank is made of stainless steel.
Furthermore, the liquid feeding tube, the first measuring cylinder, the second measuring cylinder, the third measuring cylinder and the fourth measuring cylinder are all transparent glass tubes, and the measuring ranges of the four measuring cylinders are respectively 100ml, 200ml, 300ml and 400 ml.
The invention provides a method for measuring the imbibition rate of a coal rock mass by adopting the device, which comprises the following specific operation steps:
step 1), injecting liquid: adjusting the third three-way valve to a state that the liquid feeding pipe is communicated with the liquid supply port, opening the valves above and below the first measuring cylinder, and injecting 100ml of liquid into the liquid feeding pipe and the first measuring cylinder through the liquid supply port; and then the first measuring cylinder is lifted by the lifter to fill the liquid supply pipe with liquid until liquid drops are discharged from the liquid supply port so as to discharge air in the liquid supply pipe.
Step 2), measuring the volume V of the coal sample tankPot 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 to a position where the coal sample tank is communicated with a vacuum pump, starting the vacuum pump to vacuumize the coal sample tank, and closing the vacuum pump and the first 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 second three-way valve and the third three-way valve to communicate the high-pressure helium tank with the liquid feeding pipe. The height of the first measuring cylinder is reduced by adjusting the lifter, so that a certain amount of helium (larger than the volume of the coal sample tank) is sucked into the water supply pipe, and the reading V of the first measuring cylinder at the moment is recorded1(ii) a Then respectively adjusting a second three-way valve and a first three-way valve to a water supply pipe to be communicated with a coal sample tank in sequence, enabling helium in the water supply pipe to enter the coal sample tank, adjusting the height of a first measuring cylinder to enable the liquid level in the first measuring cylinder and the water supply pipe to be level, and recording the reading V of the first measuring cylinder at the moment2(ii) a Finally, adjusting the third three-way valve to a water supply pipe to be communicated with the liquid supply port, raising the height of the first measuring cylinder and discharging the redundant helium in the water supply pipe; according to the steps, the volume V of the coal sample tankPot for storing foodIs the difference between two readings of the first cylinder, i.e. VPot for storing food=V1-V2。
Step 3), sample preparation: weighing m grams of coal sample with the particle size of 1mm, filling the m grams of coal sample into the coal sample tank measured in the step 2), and packaging the coal sample tank by using a vacuum adhesive tape; and then, putting the coal sample tank into a vacuum drying box for vacuum drying so as to remove the original moisture of the coal sample and prevent the coal sample from being oxidized in the drying process. 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 spaceQi (Qi): adjusting the first three-way valve to a 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 first 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 second three-way valve and the third three-way valve to communicate the high-pressure helium tank with the liquid feeding pipe. The height of the first measuring cylinder is reduced by adjusting the lifter, so that a certain amount of helium (larger than the volume of the coal sample tank) is sucked into the water supply pipe, and the reading V of the first measuring cylinder at the moment is recorded3(ii) a Then respectively adjusting a second three-way valve and a first three-way valve to a water supply pipe to be communicated with a coal sample tank in sequence, enabling helium in the water supply pipe to enter the coal sample tank, adjusting the height of a first measuring cylinder to enable the measuring cylinder to be level with the liquid level in the water supply pipe, and recording the reading V of the first measuring cylinder at the moment4(ii) a Finally, adjusting the third three-way valve to a water supply pipe to be communicated with the liquid supply port, raising the height of the first measuring cylinder and discharging the redundant helium in the water supply pipe; according to the steps, the volume V of the free air in the coal sample tankQi (Qi)Is the difference between two readings of the first cylinder, i.e. VQi (Qi)=V3-V4(ii) a Further, the volume V of the coal sample is knownCoal (coal)=VPot for storing food-VQi (Qi)。
Step 5), measuring the water absorption rate v of the coal sample: and adjusting the first 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 first three-way valve when the pressure in the coal sample tank reaches 2 Pa. Adjusting the third three-way valve to the water supply pipe to be communicated with the liquid supply port, raising the height of the first measuring cylinder to fill the liquid supply pipe with liquid, and recording the reading V of the first measuring cylinder at the moment5(ii) a Then the third three-way valve, the second three-way valve and the first three-way valve are adjusted in sequence to enable the liquid feeding pipe to be communicated with the coal sample tank, and the liquid feeding pipe is opened for secondsTiming by a watch, and recording the water absorption time t; adjusting the height of the first measuring cylinder to make the liquid level equal to that of the liquid supply pipe, and recording the reading V of the first measuring cylinder at the moment6(ii) a From the above steps, it can be seen that the water absorption V = V of the coal sample5-V6-VQi (Qi)And the water absorption rate V = V/t of the coal sample.
Step 6), eliminating the influence of gaps among coal sample particles: obtaining steel balls with the same volume as the coal sample in the step by using a drainage method, taking out the coal sample tank in the step, pouring out the coal sample, cleaning, putting the steel balls with the same volume as the coal sample, sealing by using a vacuum adhesive tape, putting the steel balls into a vacuum drying box for drying, and after drying is finished, putting the coal sample tank into a super thermostat and connecting the coal sample tank with a pipeline; then repeating the step 5), recording the reading V before and after the first measuring cylinder7And V8(ii) a From the above steps, the water absorption correction value V' = (V) of the coal sample5-V6)-(V7-V8) And the corrected value V '= V'/t of the water absorption rate of the coal sample.
And 7) replacing the second measuring cylinder, the third measuring cylinder and the fourth measuring cylinder to repeat the steps, and comparing and analyzing the influence of the self weight of the water on the measuring result to eliminate the measuring error.
Further, the drying temperature of the vacuum drying oven is 100 ℃, and the drying duration is 12 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 and convenient method and accurate measuring result, and eliminates the influence of irrelevant factors such as gas volume, water pressure, environment temperature, gaps among coal sample particles and the like on the measuring result;
(2) the invention can measure but not only the water absorption rate of the coal sample, and can measure the liquid absorption rate of various samples to different solutions by changing the samples and the solutions;
(3) the steps of the invention can be quantized into standard operation, and the artificial error in the test process can be reduced.
Drawings
FIG. 1 is a schematic diagram of a device for measuring the imbibition rate of a coal-rock mass.
In the figure: 1 is the helium bottle, 2 is the decompression jar, 3 is the vacuum pump, 4 is the manometer, 5 is super thermostat, 6 is the coal sample jar, 7 is the liquid supply pipe, 8 is first graduated flask, 9 is the second graduated flask, 10 is the third graduated flask, 11 is the fourth graduated flask, 12 is the riser, 13 is first three way valve, 14 is the second three way valve, 15 is the third three way valve, 16 is the valve, 17 is the liquid feed mouth.
Detailed Description
The present invention is further illustrated by, but is not limited to, the following examples.
Example 1:
as shown in figure 1, the device for measuring the imbibition rate of the coal rock mass comprises a helium supply module, a sample pretreatment module and a measurement module; the helium supply module consists of a high-pressure helium bottle 1 and a pressure reduction tank 2 which are connected through a pipeline; the sample pretreatment module comprises a vacuum pump 3, a pressure gauge 4, a super thermostat 5, a coal sample tank 6 and a vacuum drying oven, wherein the coal sample tank 6 is placed in the super thermostat 5 during measurement and is connected with the vacuum pump 3 through a first three-way valve 13; the measuring module comprises a liquid feeding pipe 7, a liquid feeding port 17, a first measuring cylinder 8, a second measuring cylinder 9, a third measuring cylinder 10, a fourth measuring cylinder 11, a corresponding lifter 12 and a valve; the four measuring cylinders are connected in parallel and are respectively connected with the liquid supply ports, wherein the liquid supply pipe 7 is used for supplying liquid to the coal sample tank 6, the measuring cylinders are used for measuring the volume of the liquid supply amount, the lifters 12 are used for adjusting the heights of the corresponding measuring cylinders so as to enable the liquid level of the measuring cylinders to be equal to that of the liquid supply pipe, and the liquid supply ports 17 are communicated with the atmosphere so as to enable the atmosphere pressure to be maintained in the measuring cylinders. The liquid supply port is used for injecting liquid into the liquid supply tube and the measuring cylinder before the measurement is started.
Furthermore, valves are respectively arranged on the pipelines above and below each measuring cylinder; each measuring cylinder is provided with a lifter, and the height of the measuring cylinder can be adjusted so as to adjust the height of the liquid level.
Furthermore, the helium supply module and the sample pretreatment module are connected through a first three-way valve, a second three-way valve and a pipeline; the helium supply module and the measuring module are connected with each other through a third three-way valve, a second three-way valve and a pipeline; and three interfaces of the third three-way valve are respectively connected with the helium supply module, the liquid supply pipe and the liquid supply port.
Furthermore, the coal sample tank 6 is composed of a tank body and a tank cover, an air hole is formed in the tank cover and connected with an air supply pipeline, a sealing ring is arranged inside the tank cover, the tank body and the tank cover are sealed through screw threads, the sealing ring and a vacuum adhesive tape, the volume of the coal sample tank is 50ml, and the coal sample tank is made of stainless steel.
Furthermore, the liquid feeding tube 7, the first measuring cylinder 8, the second measuring cylinder 9, the third measuring cylinder 10 and the fourth measuring cylinder 11 are all transparent glass tubes, and the measuring ranges of the four measuring cylinders are respectively 100ml, 200ml, 300ml and 400 ml.
The embodiment provides a method for measuring the imbibition rate of a coal rock mass by adopting the device, which comprises the following specific operation steps:
determination of the Water absorption Rate of Bituminous coal having a particle size of 2mm
1. Injecting a certain amount of distilled water into the measuring device: the three-way valve 15 is adjusted to the state that the liquid supply pipe 7 is communicated with the liquid supply port 17, the valve 16 and the valve 20 are opened, and a certain amount of liquid is injected into the liquid supply pipe 7 and the measuring cylinder 8 through the liquid supply port 17. The measuring cylinder 8 is then raised by the lifter 12 to fill the liquid supply tube with distilled water to discharge the air in the liquid supply tube until the distilled water drips out of the liquid supply port 17.
2. Measuring the volume V of the coal sample tank 6Pot for storing food: the coal sample tank 6 is packaged by a vacuum adhesive tape and placed in the super thermostat 5, the three-way valve 13 is adjusted to the position where the coal sample tank 6 is communicated with the vacuum pump 3, the vacuum pump 3 is started to vacuumize the coal sample tank 6, and the vacuum pump 3 and the three-way valve 13 are closed when the pressure in the coal sample tank 6 reaches 2 Pa. The valve of the high-pressure helium tank 1 is opened, and the three-way valve 14 and the three-way valve 15 are adjusted to communicate the high-pressure helium tank with the liquid feeding pipe 7. The height of the measuring cylinder 8 is reduced by adjusting the lifter 12, so that a certain amount (larger than the volume of the coal sample tank 6) of helium is sucked into the water supply pipe 7, and the reading of the measuring cylinder 8 is 82 ml. Then, the three-way valve 14 and the three-way valve 13 are respectively adjusted to the water supply pipe 7 and the coal sample tank 6 in sequence, so that helium in the water supply pipe 7 enters the coal sample tank 6, the height of the measuring cylinder 8 is adjusted to enable the liquid level in the measuring cylinder 8 and the water supply pipe 7 to be equal, and at the moment, the liquid level in the measuring cylinder 8 and the water supply pipe 7 is equalThe cylinder 8 reads 31 ml. And finally, adjusting the three-way valve 15 to the state that the water supply pipe 7 is communicated with the liquid supply port 17, raising the height of the measuring cylinder 8 and discharging the redundant helium in the water supply pipe 7. The volume V of the coal sample tank 6 is measured by the stepsPot for storing foodThe volume was 51 ml.
3. Sample preparation: 40g of coal sample with the particle size of 2mm is weighed and filled into a coal sample tank 6, and the coal sample is packaged by a vacuum adhesive tape. Then the coal sample tank 6 is put into a vacuum drying box for vacuum drying so as to remove the original moisture of the coal sample and prevent the coal sample from being oxidized in the drying process. After drying, the coal sample tank 6 is placed in the super thermostat 5 and connected with a pipeline.
Further, the drying temperature of the vacuum drying oven is 100 ℃, and the drying duration is 12 hours.
Further, the super-thermostat was heated in a water bath, and the temperature was maintained at 30 ℃.
4. Measuring the volume V of free gas spaceQi (Qi): and adjusting the three-way valve 13 to the position where the coal sample tank 6 is communicated with the vacuum pump 3, starting the vacuum pump 3 to vacuumize the coal sample tank 6, and closing the vacuum pump 3 and the three-way valve 13 when the pressure in the coal sample tank 6 reaches 2 Pa. The valve of the high-pressure helium tank 1 is opened, and the three-way valve 14 and the three-way valve 15 are adjusted to communicate the high-pressure helium tank with the liquid feeding pipe 7. The height of the measuring cylinder 8 is reduced by adjusting the lifter 12, so that a certain amount of helium (larger than the volume of the coal sample tank 6) is sucked into the water supply pipe 7, and the reading of the measuring cylinder 8 at the moment is recorded as 70 ml. And then respectively adjusting the three-way valve 14 and the three-way valve 13 to the water supply pipe 7 to be communicated with the coal sample tank 6 in sequence, enabling helium in the water supply pipe 7 to enter the coal sample tank 6, adjusting the height of the measuring cylinder 8 to enable the liquid level in the measuring cylinder 8 and the water supply pipe 7 to be equal, and recording the reading of 53ml of the measuring cylinder 8 at the moment. And finally, adjusting the three-way valve 15 to the state that the water supply pipe 7 is communicated with the liquid supply port 17, raising the height of the measuring cylinder 8 and discharging the redundant helium in the water supply pipe 7. From the above procedure, the volume of free air in the coal sample tank 6 was 17 ml. Further, the volume of the coal sample was found to be 34 ml.
5. Measuring the water absorption rate v of the coal sample: and adjusting the three-way valve 13 to the position where the coal sample tank 6 is communicated with the vacuum pump 3, starting the vacuum pump 3 to vacuumize the coal sample tank 6, and closing the vacuum pump 3 and the three-way valve 13 when the pressure in the coal sample tank 6 reaches 2 Pa. The three-way valve 15 is adjusted to the water supply pipe 7 to be communicated with the liquid supply port 17, the height of the measuring cylinder 8 is raised to fill the liquid supply pipe with liquid, and the reading of the measuring cylinder 8 at the moment is recorded as 84 ml. Then the three-way valve 15, the three-way valve 14 and the three-way valve 13 are adjusted in sequence to enable the liquid feeding pipe 7 to be communicated with the coal sample tank 6, and simultaneously a stopwatch is started to time, and the water absorption time is recorded as 6 s. The height of the cylinder 8 was adjusted so that the liquid level was equal to the liquid level of the feed tube 7, and 53ml reading of the cylinder 8 at this time was recorded. From the above steps, the water absorption capacity of the coal sample was 14ml, and the water absorption rate of the coal sample was 2.33 ml/s.
6. Eliminating the influence of gaps among coal sample particles: and (2) obtaining the steel balls with the volume same as that of the coal sample in the step by using a drainage method, taking out the coal sample tank 6 in the step, pouring out the coal sample, cleaning, putting the steel balls with the volume same as that of the coal sample, sealing by using a vacuum adhesive tape, putting the steel balls into a vacuum drying box for drying, and after drying is finished, putting the coal sample tank 6 into the super thermostat 5 and connecting the super thermostat with a pipeline. Step 5) above was then repeated, recording the reading before and after the cylinder 8 as 84ml and 56 ml. From the above steps, the water absorption correction value of the coal sample is V' = (V)5-V6)-(V7-V8) And = 84-53- (84-56) =3ml, namely the water absorption of the coal sample after correction is 11ml, and the water absorption rate of the coal sample after correction is 1.83 ml/s.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (6)
1. A coal or rock mass imbibition rate survey device which characterized in that: the device consists of a helium supply module, a sample pretreatment module and a determination module; the helium supply module consists of a high-pressure helium tank and a pressure reduction tank which are connected through a pipeline; the sample pretreatment module comprises a vacuum pump, a pressure 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; the measuring module comprises a liquid feeding pipe, a liquid supply port, a first measuring cylinder, a second measuring cylinder, a third measuring cylinder, a fourth measuring cylinder, a corresponding lifter and a corresponding valve; the four measuring cylinders are connected in parallel and are respectively connected with the liquid supply ports, the liquid supply pipe is used for supplying liquid to the coal sample tank, the measuring cylinders are used for measuring the volume of the liquid supply amount, the lifters are used for adjusting the heights of the corresponding measuring cylinders so as to enable the liquid level of the measuring cylinders to be equal to that of the liquid supply pipe, and the liquid supply ports are communicated with the atmosphere so as to enable the atmosphere pressure to be maintained in the measuring cylinders; the liquid supply port is used for injecting liquid into the liquid supply pipe and the measuring cylinder before the measurement is started; the helium supply module and the sample pretreatment module are connected through a first three-way valve, a second three-way valve and a pipeline; the helium supply module and the measuring module are connected with each other through a third three-way valve, a second three-way valve and a pipeline; three ports of the third three-way valve are respectively connected with a helium supply module, a liquid supply pipe and a liquid supply port;
the specific operation steps of the device are as follows:
step 1), injecting liquid: adjusting the third three-way valve to a state that the liquid feeding pipe is communicated with the liquid supply port, opening the valves above and below the first measuring cylinder, and injecting 100ml of liquid into the liquid feeding pipe and the first measuring cylinder through the liquid supply port; then, the first measuring cylinder is lifted through the lifter, so that the liquid supply pipe is filled with liquid until liquid drops are discharged from the liquid supply port, and air in the liquid supply pipe is discharged;
step 2), measuring the volume V of the coal sample tankPot 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 to a position where the coal sample tank is communicated with a vacuum pump, starting the vacuum pump to vacuumize the coal sample tank, and closing the vacuum pump and the first 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 second three-way valve and a third three-way valve to communicate the high-pressure helium tank with the liquid feeding pipe; the height of the first measuring cylinder is reduced by adjusting the lifter, so that a certain amount of helium (larger than the volume of the coal sample tank) is sucked into the water supply pipe, and the reading V of the first measuring cylinder at the moment is recorded1(ii) a Then respectively adjusting the second three-way valve and the first three-way valve to the water supply pipe to be communicated with the coal sample tank in sequence, enabling helium in the water supply pipe to enter the coal sample tank, adjusting the height of the first measuring cylinder, and enabling the first measuring cylinder and the liquid level in the water supply pipe to be communicated with each otherLeveling and recording the reading V of the first measuring cylinder at the moment2(ii) a Finally, adjusting the third three-way valve to a water supply pipe to be communicated with the liquid supply port, raising the height of the first measuring cylinder and discharging the redundant helium in the water supply pipe; according to the steps, the volume V of the coal sample tankPot for storing foodIs the difference between two readings of the first cylinder, i.e. VPot for storing food=V1-V2；
Step 3), sample preparation: weighing m grams of coal sample with the particle size of 1mm, filling the m grams of coal sample into the coal sample tank measured in the step 2), and packaging the coal sample tank by using a vacuum adhesive tape; then putting the coal sample tank into a vacuum drying box for vacuum drying so as to remove the original moisture of the coal sample and prevent the coal sample from being oxidized in the drying process; 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 spaceQi (Qi): adjusting the first three-way valve to a 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 first 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 second three-way valve and a third three-way valve to communicate the high-pressure helium tank with the liquid feeding pipe; the height of the first measuring cylinder is reduced by adjusting the lifter, so that a certain amount of helium (larger than the volume of the coal sample tank) is sucked into the water supply pipe, and the reading V of the first measuring cylinder at the moment is recorded3(ii) a Then respectively adjusting a second three-way valve and a first three-way valve to a water supply pipe to be communicated with a coal sample tank in sequence, enabling helium in the water supply pipe to enter the coal sample tank, adjusting the height of a first measuring cylinder to enable the measuring cylinder to be level with the liquid level in the water supply pipe, and recording the reading V of the first measuring cylinder at the moment4(ii) a Finally, adjusting the third three-way valve to a water supply pipe to be communicated with the liquid supply port, raising the height of the first measuring cylinder and discharging the redundant helium in the water supply pipe; according to the steps, the volume V of the free air in the coal sample tankQi (Qi)Is the difference between two readings of the first cylinder, i.e. VQi (Qi)=V3-V4(ii) a Further, the volume V of the coal sample is knownCoal (coal)=VPot for storing food-VQi (Qi)；
Step 5), measuring the water absorption rate v of the coal sample: adjusting the first three-way valve to the position where the coal sample tank is communicated with the vacuum pump, and starting the vacuum pump to pump the coal sample tankVacuum, and closing the vacuum pump and the first three-way valve when the pressure in the coal sample tank reaches 2 Pa; adjusting the third three-way valve to the water supply pipe to be communicated with the liquid supply port, raising the height of the first measuring cylinder to fill the liquid supply pipe with liquid, and recording the reading V of the first measuring cylinder at the moment5(ii) a Then adjusting a third three-way valve, a second three-way valve and the first three-way valve in sequence to enable the liquid feeding pipe to be communicated with the coal sample tank, simultaneously starting a stopwatch to time, and recording water absorption time t; adjusting the height of the first measuring cylinder to make the liquid level equal to that of the liquid supply pipe, and recording the reading V of the first measuring cylinder at the moment6(ii) a From the above steps, it can be seen that the water absorption V = V of the coal sample5-V6-VQi (Qi)The water absorption rate V = V/t of the coal sample;
step 6), eliminating the influence of gaps among coal sample particles: obtaining steel balls with the same volume as the coal sample in the step by using a drainage method, taking out the coal sample tank in the step, pouring out the coal sample, cleaning, putting the steel balls with the same volume as the coal sample, sealing by using a vacuum adhesive tape, putting the steel balls into a vacuum drying box for drying, and after drying is finished, putting the coal sample tank into a super thermostat and connecting the coal sample tank with a pipeline; then repeating the step 5), recording the reading V before and after the first measuring cylinder7And V8(ii) a From the above steps, the water absorption correction value V' = (V) of the coal sample5-V6)-(V7-V8) The corrected value V '= V'/t of the water absorption rate of the coal sample;
and 7) replacing the second measuring cylinder, the third measuring cylinder and the fourth measuring cylinder to repeat the steps, and comparing and analyzing the influence of the self weight of the water on the measuring result to eliminate the measuring error.
2. The apparatus for determining a coal or rock mass imbibition rate according to claim 1, wherein: valves are respectively arranged on the pipelines above and below each measuring cylinder; each measuring cylinder is provided with a lifter which can adjust the height of the measuring cylinder so as to adjust the height of the liquid level.
3. The apparatus for determining a coal or rock mass imbibition rate according to claim 1, wherein: the coal sample tank is composed of a tank body and a tank cover, wherein the tank cover is provided with an air hole connected with an air supply pipeline, a sealing ring is arranged inside the tank cover, the tank body and the tank cover are sealed by screw threads, the sealing ring and a vacuum adhesive tape, the volume of the coal sample tank is 50ml, and the coal sample tank is made of stainless steel.
4. The apparatus for determining a coal or rock mass imbibition rate according to claim 1, wherein: the liquid feeding pipe, the first measuring cylinder, the second measuring cylinder, the third measuring cylinder and the fourth measuring cylinder are all transparent glass pipes, and the measuring ranges of the four measuring cylinders are respectively 100ml, 200ml, 300ml and 400 ml.
5. The apparatus for determining a coal or rock mass imbibition rate according to claim 1, wherein: the drying temperature of the vacuum drying box is 100 ℃, and the drying duration is 12 hours.
6. The apparatus for determining a coal or rock mass imbibition rate according to claim 1, wherein: the super-thermostat was heated in a water bath, maintaining the temperature at 30 ℃.
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| CN102435537A (en) * | 2011-11-21 | 2012-05-02 | 中国石油大学(华东) | Coal petrography rock core gas permeability measuring device |
| CN103592211A (en) * | 2013-11-18 | 2014-02-19 | 深圳先进技术研究院 | Porosity measuring method and device of porous material |
| CN204008401U (en) * | 2014-08-06 | 2014-12-10 | 河南理工大学 | A kind of for measuring the device of temperature variation Coal Under rock sample porosity |
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