CN102901803B - Water-gas different adsorption-desorption-seepage experimental method for loaded coal containing methane - Google Patents
Water-gas different adsorption-desorption-seepage experimental method for loaded coal containing methane Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 235
- 238000002474 experimental method Methods 0.000 title claims abstract description 33
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title abstract 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 145
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000002336 sorption--desorption measurement Methods 0.000 claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 239000012153 distilled water Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 11
- 238000000605 extraction Methods 0.000 claims description 10
- 229920006395 saturated elastomer Polymers 0.000 claims description 10
- 238000003795 desorption Methods 0.000 claims description 9
- 238000001179 sorption measurement Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 156
- 238000005325 percolation Methods 0.000 description 5
- 230000006837 decompression Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000344 soap Substances 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- -1 ground temperature Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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Abstract
Description
技术领域 technical field
本发明涉及一种用于不同载荷、不同温度、不同含水率和水气两相介质条件下的含瓦斯煤吸附-解吸-渗流实验研究技术，是一种受载含瓦斯煤水气两相变温吸附-解吸-渗流实验系统和方法。 The invention relates to a gas-containing coal adsorption-desorption-seepage experimental research technology under the conditions of different loads, different temperatures, different water contents and water-gas two-phase media. Thermal adsorption-desorption-percolation experimental system and method.
背景技术 Background technique
煤层中瓦斯气体的吸附-解吸-渗流特性受瓦斯压力、地应力、地下水、地温、煤体结构、受力状态等诸多因素的影响，尤其是随着我国煤矿日益进入深部开采，这种多因素耦合关系表现得更加明显。以往的吸附-解吸实验系统和渗流实验系统基本上是分开来的，而且对影响因素考虑得不是很全面。 The adsorption-desorption-seepage characteristics of gas in coal seams are affected by many factors such as gas pressure, ground stress, groundwater, ground temperature, coal body structure, and stress state, especially as my country's coal mines increasingly enter deep mining. The coupling relationship is more obvious. The previous adsorption-desorption experimental system and percolation experimental system were basically separated, and the influencing factors were not considered comprehensively.
发明内容 Contents of the invention
本发明的目的是克服现有实验技术的不足，提供一种受载含瓦斯煤水气两相变温吸附-解吸-渗流实验系统和方法，通过改变不同的加载条件、加载路径和实验温度，可以实现受载含瓦斯煤在不同固气热耦合条件下的吸附解吸实验和瓦斯渗流实验、也可以实现水气两相的渗流实验和不同含水率条件下的瓦斯吸附解吸实验的系统和方法。 The purpose of the present invention is to overcome the deficiencies of the existing experimental technology, to provide a loaded gas-containing coal-water gas two-phase temperature-swing adsorption-desorption-seepage experimental system and method, by changing different loading conditions, loading paths and experimental temperatures, The system and method can realize the adsorption and desorption experiment and gas seepage experiment of loaded gas-containing coal under different solid-gas thermal coupling conditions, and can also realize the water-gas two-phase seepage experiment and the gas adsorption and desorption experiment under different water content conditions.
为实现上述目的，本发明采用如下技术方案：一种受载含瓦斯煤水气两相变温吸附-解吸-渗流实验系统，包括压力加载部分，压力加载部分包括用于盛装恒温水浴的池体，池体内设参考罐和煤样夹持器，参考罐的进气口连接高压瓦斯输送管路，参考罐的出气口通过连接管路连接煤样夹持器的进气口，煤样夹持器的出气口连接水气分离装置。 In order to achieve the above object, the present invention adopts the following technical scheme: a two-phase temperature-swing adsorption-desorption-seepage experimental system for loaded gas-containing coal, water and gas, including a pressure loading part, and the pressure loading part includes a tank body for holding a constant temperature water bath , the pool body is equipped with a reference tank and a coal sample holder, the air inlet of the reference tank is connected to the high-pressure gas delivery pipeline, the gas outlet of the reference tank is connected to the air inlet of the coal sample holder through the connecting pipeline, and the coal sample holder The gas outlet of the device is connected to the water-gas separation device.
受载含瓦斯煤水气两相变温吸附-解吸-渗流实验系统还包括煤样制作装置，煤样制作装置包括顶部设有抽气口的煤样罐，煤样罐的抽气口连接抽真空管路。 The loaded gas-containing coal-water-gas two-phase temperature-swing adsorption-desorption-seepage experimental system also includes a coal sample production device. The coal sample production device includes a coal sample tank with a gas extraction port on the top, and the gas extraction port of the coal sample tank is connected to a vacuum pipeline. .
所述水气分离装置为水气分离器，水气分离器的出气口连接瓦斯计量装置,水气分离器的排液口连接液体计量装置。 The water-gas separator is a water-gas separator, the gas outlet of the water-gas separator is connected to the gas metering device, and the liquid outlet of the water-gas separator is connected to the liquid metering device.
所述高压瓦斯输送管路上依次设有高压瓦斯罐、第一减压阀、第一压力表和开关阀；参考罐的出气口与煤样夹持器进气口之间的连接管路上也依次设有第二压力表、开关阀、第二减压阀、第三压力表以及开关阀。 A high-pressure gas tank, a first pressure reducing valve, a first pressure gauge and a switching valve are sequentially arranged on the high-pressure gas delivery pipeline; A second pressure gauge, a switch valve, a second pressure reducing valve, a third pressure gauge and a switch valve are provided.
采用上述实验系统进行受载含瓦斯煤水气两相渗流实验的方法，包括如下步骤：（一）先制备受载含瓦斯煤水气两相变温吸附-解吸-渗流实验系统，（二）取一初始煤样，将初始煤样放入煤样罐内，煤样罐内装入至少没过初始煤样的水，水面低于抽气口，然后通过抽真空管路对煤样罐抽真空，将初始煤样制成含有饱和水的含水煤样，（三）从煤样罐中取出含水煤样并装入煤样夹持器，通过高压瓦斯输送管路向参考罐内输入一定压力的瓦斯气体，将池体内充满恒温水浴，将参考罐和煤样夹持器一起置于池体内设置的恒温水浴中，使参考罐中的瓦斯气体温度和含水煤样温度均达到实验温度，（四）通过煤样夹持器对含水煤样加载围压和/或轴压并稳压，（五）参考罐通过连接管路向含水煤样内部充入一定压力大小的瓦斯气体，开始进行含瓦斯煤水气两相渗流过程，（六）从含水煤样内部出来的水以及瓦斯气体通过水气分离器后，分别通过瓦斯计量装置和液体计量装置计量瓦斯流量和水流量。 The method for using the above-mentioned experimental system to carry out the two-phase seepage experiment of loaded gas-containing coal-water-gas includes the following steps: (1) firstly prepare a loaded gas-containing coal-water-gas two-phase temperature-swing adsorption-desorption-seepage experimental system, (2) Take an initial coal sample, put the initial coal sample into the coal sample tank, fill the coal sample tank with water that has not covered the initial coal sample at least, the water level is lower than the gas extraction port, and then vacuum the coal sample tank through the vacuum pipeline, and put The initial coal sample is made into a water-containing coal sample containing saturated water. (3) Take out the water-containing coal sample from the coal sample tank and put it into the coal sample holder, and input a certain pressure of gas gas into the reference tank through the high-pressure gas pipeline, Fill the tank body with a constant temperature water bath, place the reference tank and the coal sample holder together in the constant temperature water bath set in the tank body, so that the temperature of the gas gas in the reference tank and the temperature of the water-containing coal sample reach the experimental temperature, (4) Pass the coal The sample holder applies confining pressure and/or axial pressure to the water-containing coal sample and stabilizes the pressure. (5) The reference tank is filled with a certain pressure of gas gas into the water-containing coal sample through the connecting pipeline, and the gas-containing coal-water-gas dual Phase seepage process, (6) After the water and gas gas coming out of the water-containing coal sample pass through the water-gas separator, the gas flow rate and water flow rate are measured by the gas metering device and the liquid metering device respectively.
在含水煤样装入煤样夹持器前，先计算出含水煤样的孔隙度。 Before the water-containing coal sample is loaded into the coal sample holder, the porosity of the water-containing coal sample is calculated first.
采用上述实验系统进行受载含瓦斯煤不同含水率吸附-解吸实验的方法，其特征在于：包括如下步骤：（一）先制备受载含瓦斯煤水气两相变温吸附-解吸-渗流实验系统，（二）取一初始煤样，取一初始煤样，将初始煤样放入煤样罐内，煤样罐内装入至少没过初始煤样的水，水面低于抽气口，然后通过抽真空管路对煤样罐抽真空，将初始煤样制成含有饱和水的含水煤样，（三）将含水煤样装入煤样夹持器并对含水煤样施加一定大小的围压，再利用参考罐中的瓦斯气体通过连接管路去驱替含水煤样中的水分，然后卸掉围压，从煤样夹持器中取出含水煤样，并计算含水煤样的含水率，再次将含水煤样装入煤样夹持器，通过高压瓦斯输送管路向参考罐内输入一定压力的瓦斯气体，将池体内充满恒温水浴，这样参考罐和煤样夹持器一起置于池体内设置的恒温水浴中，使参考罐中的瓦斯气体温度和含水煤样温度均达到实验温度，（四）通过煤样夹持器对含水煤样加载围压和/或轴压并稳压，（五）参考罐通过连接管路向含水煤样内充入瓦斯气体，开始受载含瓦斯煤的吸附过程，含水煤样吸附瓦斯不小于12小时，（六）待煤样吸附平衡之后，从含水煤样内部出来的瓦斯以及蒸馏水通过水气分离器，开始进行受载含瓦斯煤的解析实验过程，瓦斯解吸量通过计量瓶来计量。 The method for carrying out the adsorption-desorption experiment with different water content of the loaded gas-containing coal by using the above-mentioned experimental system is characterized in that it includes the following steps: (1) First prepare the loaded gas-containing coal water-gas two-phase temperature-swing adsorption-desorption-seepage experiment System, (2) Take an initial coal sample, take an initial coal sample, put the initial coal sample into the coal sample tank, fill the coal sample tank with water that has not passed the initial coal sample at least, the water level is lower than the gas suction port, and then pass The vacuum pipeline vacuumizes the coal sample tank, and the initial coal sample is made into a water-containing coal sample containing saturated water. (3) Put the water-containing coal sample into the coal sample holder and apply a certain size of confining pressure to the water-containing coal sample, Then use the gas in the reference tank to displace the moisture in the water-containing coal sample through the connecting pipeline, then release the confining pressure, take out the water-containing coal sample from the coal sample holder, and calculate the water content of the water-containing coal sample, and then Put the water-containing coal sample into the coal sample holder, input a certain pressure of gas gas into the reference tank through the high-pressure gas delivery pipeline, and fill the tank with a constant temperature water bath, so that the reference tank and the coal sample holder are placed together in the tank for setting In the constant temperature water bath, make the temperature of the gas gas in the reference tank and the temperature of the water-containing coal sample reach the experimental temperature, (4) load the confining pressure and/or axial pressure on the water-containing coal sample through the coal sample holder and stabilize the pressure, (5) ) The reference tank is filled with gas gas into the water-containing coal sample through the connecting pipeline, and the adsorption process of loaded gas-containing coal is started. The water-containing coal sample absorbs gas for no less than 12 hours. The gas and distilled water coming out of the interior pass through the water-gas separator to start the desorption experiment process of loaded gas-containing coal, and the gas desorption amount is measured by a metering bottle.
本发明所述的受载含瓦斯煤不同含水率吸附-解吸实验的方法，既考虑了瓦斯气体的吸附解吸作用，又考虑了瓦斯的渗流过程，能同时考虑不同温度、不同受力状态、不同加载路径、单相介质、水气两相介质和不同含水率等条件下的综合影响，通过数据处理可以得到各种组合实验条件下的实验曲线。而且，通过恒温水浴和参考罐可以提供恒定不变的实验温度环境；通过加入蒸馏水，可以实现水气两相吸附-解吸-渗流实验，也可以实现不同含水率条件下的吸附-解吸实验，增加了系统的实验功能；通过轴向加载装置，实现了对煤样施加轴向载荷，随着轴向压力的增加，可以用于考察煤样内部的微裂纹扩展和破坏对瓦斯吸附-解吸特性的影响，这是其他多数实验系统和设备无法具备的实验功能；计量装置能够准确检测和计量各种实验参数大小，以确保原始数据的可靠性。 The method for adsorption-desorption experiments with different water contents of loaded gas-containing coal according to the present invention not only considers the adsorption and desorption of gas gas, but also considers the seepage process of gas, and can simultaneously consider different temperatures, different stress states, different The comprehensive influence of loading path, single-phase medium, water-air two-phase medium and different water content conditions, through data processing, experimental curves under various combined experimental conditions can be obtained. Moreover, the constant temperature water bath and the reference tank can provide a constant experimental temperature environment; by adding distilled water, the water-air two-phase adsorption-desorption-percolation experiment can be realized, and the adsorption-desorption experiment under different water content conditions can also be realized. The experimental function of the system is improved; through the axial loading device, the axial load is applied to the coal sample. With the increase of the axial pressure, it can be used to investigate the influence of the micro-crack expansion and destruction inside the coal sample on the gas adsorption-desorption characteristics. This is an experimental function that most other experimental systems and equipment cannot possess; the measuring device can accurately detect and measure the size of various experimental parameters to ensure the reliability of the original data.
附图说明 Description of drawings
图1是本发明的结构示意图； Fig. 1 is a structural representation of the present invention;
图2是煤样制作装置的结构示意图。 Fig. 2 is a structural schematic diagram of a coal sample preparation device.
具体实施方式 Detailed ways
实施例1： Example 1:
由图1和图2所示的受载含瓦斯煤水气两相变温吸附-解吸-渗流实验系统，包括压力加载部分和煤样制作装置。 The loaded gas-containing coal-water-gas two-phase temperature-swing adsorption-desorption-seepage experimental system shown in Figure 1 and Figure 2 includes a pressure loading part and a coal sample preparation device.
压力加载部分包括用于盛装恒温水浴4A的池体4，池体4内设参考罐5和煤样夹持器6，参考罐5为密闭设置且设有进气口和出气口，参考罐5的进气口连接高压瓦斯输送管路7，高压瓦斯输送管路7上依次设有高压瓦斯罐1、第一减压阀2、第一压力表14和开关阀20，高压瓦斯罐1的高压瓦斯气体可输入参考罐5内，并分别通过第一减压阀2、第一压力表14和开关阀20实现高压瓦斯输送管路7减压、测压和开关，其中高压瓦斯罐1的出口处还自带有开关阀19；参考罐5的出气口通过连接管路8连接煤样夹持器6的进气口，从参考罐5至煤样夹持器6之间的连接管路8上依次设有第二压力表15、开关阀21、第二减压阀3、第三压力表16以及开关阀22，第二压力表15、第三压力表16用以测量从参考罐5出来的瓦斯气体降压前后的瓦斯压力值，开关阀21、22用以开关整个连接管路8的开关，煤样夹持器6的出气口通过管道11连接水气分离装置，管道11上设有开关阀25以控制管道11的开关。水气分离装置为水气分离器9，水气分离器9的出气口18通过第一连接管23连接瓦斯计量装置,瓦斯计量装置为皂沫流量计10，水气分离器9的排液口17通过第二连接管24连接液体计量装置，液体计量装置为计量瓶12，计量瓶12的顶口连接第二连接管24，计量瓶12的底口通过管子接入集液杯13。其中煤样夹持器6可夹持、固定密封煤样并连接围压计量泵或者轴压计量泵，可对煤样实施围压或者轴压，也可称为煤层岩心夹持器、三轴应力煤心夹持器或者直接使用专利号为ZL201020128142.3，名称为“多功能真三轴应力煤心夹持器”也可，此处为现有技术，故不详细叙述。 The pressure loading part includes a pool body 4 for holding a constant temperature water bath 4A. A reference tank 5 and a coal sample holder 6 are arranged inside the pool body 4. The reference tank 5 is airtight and is provided with an air inlet and an air outlet. The reference tank 5 The air inlet of the high-pressure gas delivery pipeline 7 is connected to the high-pressure gas delivery pipeline 7. The high-pressure gas tank 1, the first pressure reducing valve 2, the first pressure gauge 14 and the switch valve 20 are arranged in sequence on the high-pressure gas delivery pipeline 7. The gas can be input into the reference tank 5, and through the first decompression valve 2, the first pressure gauge 14 and the switch valve 20 respectively realize the decompression, pressure measurement and switch of the high-pressure gas delivery pipeline 7, wherein the outlet of the high-pressure gas tank 1 There is also a switch valve 19 at the place; the gas outlet of the reference tank 5 is connected to the air inlet of the coal sample holder 6 through the connection pipeline 8, and the connection pipeline 8 between the reference tank 5 and the coal sample holder 6 The second pressure gauge 15, the switch valve 21, the second pressure reducing valve 3, the third pressure gauge 16 and the switch valve 22 are arranged in sequence on the top, and the second pressure gauge 15 and the third pressure gauge 16 are used to measure the pressure from the reference tank 5. The gas pressure value before and after the depressurization of the gas gas, the switch valves 21 and 22 are used to switch the switch of the entire connecting pipeline 8, the gas outlet of the coal sample holder 6 is connected to the water-gas separation device through the pipeline 11, and the pipeline 11 is provided with The switch valve 25 is used to control the opening and closing of the pipeline 11 . The water-gas separation device is a water-gas separator 9, the gas outlet 18 of the water-gas separator 9 is connected to the gas metering device through the first connecting pipe 23, the gas metering device is a soap foam flowmeter 10, and the liquid outlet of the water-gas separator 9 17 is connected to the liquid metering device by the second connection pipe 24, the liquid metering device is the metering bottle 12, the top port of the metering bottle 12 is connected to the second connection pipe 24, and the bottom port of the metering bottle 12 is connected to the liquid collection cup 13 through a pipe. Among them, the coal sample holder 6 can hold, fix and seal the coal sample and is connected with a confining pressure metering pump or an axial pressure metering pump, so that the coal sample can be subjected to confining pressure or axial pressure. It can also be called a coal seam core holder, a three-axis The stress coal core holder or directly use the patent No. ZL201020128142.3, and the name is "Multifunctional True Triaxial Stress Coal Core Holder".
煤样制作装置包括顶部设有抽气口32的煤样罐26，煤样罐26由罐体和密封于罐体顶口的密封盖构成，煤样罐26材质为有机玻璃，抽气口32设置于密封盖的顶端，煤样罐26的抽气口32连接抽真空管路33，抽真空管路33依次设有真空泵31、开关阀30和缓冲容器29，真空泵31用于抽真空，开关阀30以控制抽真空管路33的开关，缓冲容器29起到缓存作用。 Coal sample making device comprises the coal sample tank 26 that the top is provided with gas extraction port 32, and coal sample tank 26 is made of tank body and the sealing cover that is sealed in tank body top mouth, and coal sample tank 26 material is plexiglass, and gas extraction port 32 is arranged on The top of the sealing cover, the air pumping port 32 of the coal sample tank 26 is connected with a vacuuming pipeline 33, and the vacuuming pipeline 33 is provided with a vacuum pump 31, an on-off valve 30 and a buffer container 29 in turn, the vacuum pump 31 is used for vacuuming, and the on-off valve 30 is used to control the vacuuming. The switch of the vacuum pipeline 33, the buffer container 29 plays a buffer role.
将煤样罐26内置煤样以及蒸馏水，煤样制作装置可对煤样抽真空饱和水，即用于对煤样进行抽真空并饱和蒸馏水，使煤样内既吸附水分又无气体存在；水气分离装置用于对从煤样夹持器6上煤样出来的蒸馏水和瓦斯气体进行分离；池体4用于盛装恒温水浴4A并与其他配套温控仪器组成温控装置，为实验提供恒定的温度环境，确保实验数据的准确性。 Coal sample tank 26 is built with coal sample and distilled water, and the coal sample making device can vacuumize the coal sample and saturate the water, that is, it is used to vacuumize the coal sample and saturate the distilled water, so that the coal sample can absorb moisture and have no gas; The gas separation device is used to separate the distilled water and gas from the coal sample on the coal sample holder 6; the pool body 4 is used to hold the constant temperature water bath 4A and forms a temperature control device with other supporting temperature control instruments to provide a constant temperature for the experiment. temperature environment to ensure the accuracy of the experimental data.
本发明所述的受载含瓦斯煤水气两相变温吸附-解吸-渗流实验系统，可通过计量实验过程中的瓦斯压力大小、围压大小、轴压大小、温度大小、水流量大小、瓦斯气体流量大小等实验数据，记录并监测实验过程中的重要数据，为实验分析提供准确真实的原始数据。 The loaded gas-containing coal-water-gas two-phase temperature-swing adsorption-desorption-seepage experimental system of the present invention can measure the gas pressure, confining pressure, axial pressure, temperature, water flow, Experimental data such as the flow rate of gas, record and monitor important data during the experiment, and provide accurate and real raw data for experimental analysis.
本发明提供的实验系统能实现如下主要实验功能： The experimental system provided by the invention can realize the following main experimental functions:
（1）受载含瓦斯煤吸附-解吸实验； (1) Adsorption-desorption experiment of loaded gas-containing coal;
（2）受载含瓦斯煤吸附-解吸-渗流实验； (2) Adsorption-desorption-seepage experiment of loaded gas-containing coal;
（3）受载含瓦斯煤水气两相渗流实验； (3) Water-gas two-phase seepage experiment of loaded gas-containing coal;
（4）不同含水率受载含瓦斯煤的吸附-解吸实验。 (4) Adsorption-desorption experiment of gas-containing coal loaded with different moisture content.
实施例2： Example 2:
由图1和图2所示的受载含瓦斯煤水气两相渗流实验方法，包括如下步骤： The experimental method of loaded gas-containing coal-water-gas two-phase seepage shown in Fig. 1 and Fig. 2 includes the following steps:
（一）先制备如实施例1所述的受载含瓦斯煤水气两相变温吸附-解吸-渗流实验系统，连接所有管路并关闭所有开关阀。 (1) Prepare the loaded gas-containing coal-water-gas two-phase temperature-swing adsorption-desorption-percolation experimental system as described in Example 1, connect all pipelines and close all on-off valves.
（二）取一初始煤样，煤样尺寸在Φ50×100mm左右，置于精密电子天平上称重，计初始煤样的初始重量为m0，将初始煤样放入煤样罐26内，向煤样罐26内装入至少没过初始煤样顶面的蒸馏水28，蒸馏水28水面低于抽气口32，然后将抽真空管路33连接煤样罐26的抽气口32，检查煤样罐26以及抽真空管路33的气密性后，通过抽真空管路33对煤样罐26抽真空，进行抽真空饱和水过程并将该过程持续三小时，将初始煤样制成含有饱和水但不含气体的含水煤样27，抽真空饱和水过程完成后，将煤样罐26中的蒸馏水倒出，小心取出含水煤样27，并对含水煤样27称重计为m1，然后根据下式计算含水煤样27的孔隙体积： (2) Take an initial coal sample, the size of the coal sample is about Φ50×100mm, put it on a precision electronic balance and weigh it, calculate the initial weight of the initial coal sample as m 0 , put the initial coal sample into the coal sample tank 26, In the coal sample tank 26, load at least the distilled water 28 that has not crossed the top surface of the initial coal sample, the distilled water 28 water level is lower than the gas outlet 32, then the vacuum pipeline 33 is connected to the gas inlet 32 of the coal sample tank 26, and the coal sample tank 26 and After the airtightness of the vacuum pipeline 33, the coal sample tank 26 is evacuated through the vacuum pipeline 33, and the process of vacuuming saturated water is carried out and the process continues for three hours, and the initial coal sample is made to contain saturated water but no gas. After the water-containing coal sample 27 is vacuumed and saturated with water, the distilled water in the coal sample tank 26 is poured out, and the water-containing coal sample 27 is carefully taken out, and the water-containing coal sample 27 is weighed as m 1 , and then calculated according to the following formula Pore volume of water-bearing coal sample 27:
（1） (1)
式中：vs为含水煤样27的孔隙体积；ρw为蒸馏水的密度。 In the formula: v s is the pore volume of water-bearing coal sample 27; ρ w is the density of distilled water.
知道含水煤样27的孔隙体积后，含水煤样27的孔隙度用下式计算得到。 After knowing the pore volume of the water-containing coal sample 27, the porosity of the water-containing coal sample 27 can be calculated by the following formula.
（2） (2)
式中：v为含水煤样27的总体积。 In the formula: v is the total volume of the water-containing coal sample 27.
（三）从煤样罐26中取出含水煤样27并装入煤样夹持器6，打开开关阀19、20，通过高压瓦斯输送管路7从高压瓦斯罐1向参考罐5内输入一定压力的瓦斯气体，瓦斯压力大小通过第一减压阀2来调整，将池体4内充满恒温水浴4A，将参考罐5和煤样夹持器6一起置于池体4内设置的恒温水浴4A中，使参考罐5内的瓦斯气体温度和含水煤样27温度均达到恒温水浴所设定的实验温度。 (3) Take out the water-containing coal sample 27 from the coal sample tank 26 and put it into the coal sample holder 6, open the on-off valves 19 and 20, and input a certain amount from the high-pressure gas tank 1 to the reference tank 5 through the high-pressure gas pipeline 7. Pressure gas, the gas pressure is adjusted by the first pressure reducing valve 2, the pool body 4 is filled with a constant temperature water bath 4A, and the reference tank 5 and the coal sample holder 6 are placed together in the constant temperature water bath set in the pool body 4 In 4A, make the gas temperature in the reference tank 5 and the temperature of the water-containing coal sample 27 both reach the experimental temperature set by the constant temperature water bath.
（四）关闭开关阀19、20，通过煤样夹持器6对含水煤样27加载一定大小的围压并稳压，待围压稳定后，再对含水煤样27加载一定大小的轴压并稳压。当然，本发明不拘泥于上述形式，也可根据实验方式和目的，单独施加围压或者轴压，压力的大小均可由煤样夹持器6设定以及显示，并且围压、轴压的施加先后顺序据情况定。 (4) Close the switch valves 19 and 20, apply a certain amount of confining pressure to the water-containing coal sample 27 through the coal sample holder 6 and stabilize the pressure, and then apply a certain amount of axial pressure to the water-containing coal sample 27 after the confining pressure is stabilized And stabilize the voltage. Of course, the present invention is not limited to the above-mentioned form, and can also apply confining pressure or axial pressure separately according to the experimental method and purpose. The size of the pressure can be set and displayed by the coal sample holder 6, and the application of confining pressure and axial pressure The order is determined according to the situation.
（五）待含水煤样27的轴压稳定后，打开开关阀21、22、25，参考罐5通过连接管路8向含水煤样27内部充入一定压力大小的瓦斯气体，开始进行含瓦斯煤水气两相渗流过程，瓦斯压力的大小可通过第二减压阀3来调整。 (5) After the axial pressure of the water-containing coal sample 27 is stabilized, open the on-off valves 21, 22, and 25, and the reference tank 5 fills the inside of the water-containing coal sample 27 with a certain pressure of gas gas through the connecting pipeline 8 to start the gas-containing process. In the coal-water-gas two-phase seepage process, the gas pressure can be adjusted through the second pressure reducing valve 3 .
（六）从含水煤样27内部出来的蒸馏水以及瓦斯气体通过水气分离器9后，分别通过瓦斯计量装置的皂沫流量计10和液体计量装置的计量瓶12计量瓦斯流量和水流量。 (6) After the distilled water and gas gas from the water-containing coal sample 27 pass through the water-gas separator 9, the gas flow and water flow are measured through the soap foam flowmeter 10 of the gas metering device and the metering bottle 12 of the liquid metering device.
（七）当一种实验条件下的水气两相渗流结束之后，可以通过改变实验温度、围压、轴压和瓦斯压力大小来改变实验条件，从而可以得出受载含瓦斯煤在各种不同实验条件下的水气两相渗流特性及其规律。 (7) After the water-gas two-phase seepage under one experimental condition is over, the experimental conditions can be changed by changing the experimental temperature, confining pressure, axial pressure and gas pressure, so that it can be obtained that the loaded gas-containing coal in various Water-air two-phase seepage characteristics and laws under different experimental conditions.
实施例3： Example 3:
由图1和图2所示的受载含瓦斯煤不同含水率吸附-解吸实验方法，包括如下步骤：（一）先制备如实施例1所述的受载含瓦斯煤水气两相变温吸附-解吸-渗流实验系统，连接所有管路并关闭所有开关阀。 The adsorption-desorption experimental method of loaded gas-containing coal with different water contents shown in Fig. 1 and Fig. 2 includes the following steps: (1) First prepare the loaded gas-containing coal water-gas two-phase temperature change as described in Example 1. Adsorption-desorption-percolation experimental system, connect all pipelines and close all switch valves.
（二）置于精密电子天平上称重，计初始煤样的初始重量为m0，将初始煤样放入煤样罐26内，向煤样罐26内装入至少没过初始煤样顶面的蒸馏水28，蒸馏水28水面低于抽气口32，然后将抽真空管路33连接煤样罐26的抽气口32，检查煤样罐26以及抽真空管路33的气密性后，通过抽真空管路33对煤样罐26抽真空，进行抽真空饱和水过程并将该过程持续三小时，将初始煤样制成含有饱和水但不含气体的含水煤样27，抽真空饱和水过程完成后，将煤样罐26中的蒸馏水倒出，小心取出含水煤样27。含水煤样27可制成含水率不同的多块。 (2) Place it on a precise electronic balance and weigh it. Calculate the initial weight of the initial coal sample as m 0 . Put the initial coal sample into the coal sample tank 26, and fill the coal sample tank 26 at least above the top surface of the initial coal sample. The distilled water 28, the water surface of the distilled water 28 is lower than the air outlet 32, then the vacuum pipeline 33 is connected to the air outlet 32 of the coal sample tank 26, after checking the airtightness of the coal sample tank 26 and the vacuum pipeline 33, pass the vacuum pipeline 33 The coal sample tank 26 is evacuated, and the vacuum saturated water process is carried out and the process continues for three hours, and the initial coal sample is made into a water-containing coal sample 27 that contains saturated water but does not contain gas. After the vacuum saturated water process is completed, the The distilled water in the coal sample tank 26 is poured out, and the water-containing coal sample 27 is carefully taken out. The water-containing coal sample 27 can be made into multiple blocks with different water contents.
（三）将含水煤样27装入煤样夹持器6并对含水煤样27施加一定大小的围压，再利用参考罐5中的瓦斯气体通过连接管路8去驱替含水煤样27中的水分，然后卸掉围压，从煤样夹持器6中取出含水煤样27，并称重m1，含水煤样27的含水率便可以通过下式计算得到： (3) Put the water-containing coal sample 27 into the coal sample holder 6 and apply a certain amount of confining pressure to the water-containing coal sample 27, and then use the gas in the reference tank 5 to displace the water-containing coal sample 27 through the connecting pipeline 8 Then remove the confining pressure, take out the water-containing coal sample 27 from the coal sample holder 6, and weigh m1, the moisture content of the water-containing coal sample 27 can be calculated by the following formula:
（3） (3)
含水率大小可以通过驱替的水量来确定。 The water cut can be determined by the amount of water displaced.
再将含水煤样27装入煤样夹持器6，打开开关阀19、20，通过高压瓦斯输送管路7从高压瓦斯罐1向参考罐5内输入一定压力的瓦斯气体，瓦斯压力大小通过第一减压阀2来调整，将池体4内充满恒温水浴4A，使参考罐5和煤样夹持器6一起置于池体4内设置的恒温水浴4A中，使参考罐5中的瓦斯气体温度和含水煤样27温度均达到实验温度。 Then put the water-containing coal sample 27 into the coal sample holder 6, open the switch valves 19 and 20, and input a certain pressure of gas gas from the high-pressure gas tank 1 to the reference tank 5 through the high-pressure gas delivery pipeline 7, and the gas pressure depends on the The first decompression valve 2 is adjusted, and the pool body 4 is filled with a constant temperature water bath 4A, so that the reference tank 5 and the coal sample holder 6 are placed together in the constant temperature water bath 4A provided in the pool body 4, so that the reference tank 5 The temperature of the gas gas and the temperature of the water-containing coal sample 27 both reached the experimental temperature.
（四）关闭开关阀19、20，通过煤样夹持器6对含水煤样27加载一定大小的围压并稳压，待围压稳定后，再对含水煤样27加载一定大小的轴压并稳压。当然，本发明不拘泥于上述形式，也可根据实验方式和目的，单独施加围压或者轴压，压力的大小均可由煤样夹持器6设定以及显示，并且围压、轴压的施加先后顺序据情况定。 (4) Close the switch valves 19 and 20, apply a certain amount of confining pressure to the water-containing coal sample 27 through the coal sample holder 6 and stabilize the pressure, and then apply a certain amount of axial pressure to the water-containing coal sample 27 after the confining pressure is stabilized And stabilize the voltage. Of course, the present invention is not limited to the above-mentioned form, and can also apply confining pressure or axial pressure separately according to the experimental method and purpose. The size of the pressure can be set and displayed by the coal sample holder 6, and the application of confining pressure and axial pressure The order is determined according to the situation.
（五）待含水煤样27的轴压稳定后，打开开关阀21、22，利用参考罐5通过连接管路8向含水煤样27内部充入一定压力大小的瓦斯气体，开始受载含瓦斯煤的吸附过程，含水煤样27吸附瓦斯不小于12小时，吸附量通过参考罐5的瓦斯压力降低值计算得到，即第二压力表15和第三压力表16的差值得到。 (5) After the axial pressure of the water-containing coal sample 27 is stabilized, open the on-off valves 21 and 22, use the reference tank 5 to fill the inside of the water-containing coal sample 27 with a certain pressure of gas gas through the connecting pipeline 8, and start to load the gas-containing In the coal adsorption process, the water-containing coal sample 27 adsorbs gas for not less than 12 hours, and the adsorption amount is calculated by referring to the gas pressure drop value of the tank 5, that is, the difference between the second pressure gauge 15 and the third pressure gauge 16.
（六）待煤样吸附平衡之后，关闭开关阀22，打开开关阀25，从含水煤样27内部出来的瓦斯以及蒸馏水通过水气分离器9，开始进行受载含瓦斯煤的解析实验过程，瓦斯解吸量通过计量瓶12来计量。 (6) After the coal sample is adsorbed and balanced, the on-off valve 22 is closed, the on-off valve 25 is opened, the gas and distilled water coming out of the water-containing coal sample 27 pass through the water-gas separator 9, and the analysis experiment process of the loaded gas-containing coal is started. The amount of gas desorption is measured by metering bottle 12.
（七）当一种含水率的受载含瓦斯煤的吸附解吸实验完成后，可以通过改变实验温度、围压、轴压和瓦斯压力的大小来改变实验条件，从而可以得出不同含水率受载含瓦斯煤在各种不同实验条件下的吸附解吸特性及其规律。 (7) After the adsorption and desorption experiment of a gas-containing coal with a moisture content is completed, the experimental conditions can be changed by changing the experimental temperature, confining pressure, axial pressure and gas pressure, so that it can be obtained Adsorption and desorption characteristics and laws of gas-bearing coal under various experimental conditions.
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