CN209745750U - Deformation-adsorption capacity synchronous testing device in gas adsorption process of coal body - Google Patents
Deformation-adsorption capacity synchronous testing device in gas adsorption process of coal body Download PDFInfo
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- CN209745750U CN209745750U CN201920577738.2U CN201920577738U CN209745750U CN 209745750 U CN209745750 U CN 209745750U CN 201920577738 U CN201920577738 U CN 201920577738U CN 209745750 U CN209745750 U CN 209745750U
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Abstract
The synchronous testing device for the deformation and the adsorption amount in the process of gas adsorption of a coal body comprises a reference tank, a coal sample tank, a constant-temperature water bath box, a resistance strain gauge, a computer, a vacuum pump, a vacuum gauge, a high-pressure gas cylinder and an inflation connecting pipe; the reference tank and the coal sample tank are arranged in the constant-temperature water bath box side by side at the left and right and are communicated through an adsorption connecting pipe, self-storage temperature and pressure sensors are arranged in the reference tank and the coal sample tank, and a coal sample is arranged in the coal sample tank; the resistance strain gauge is adhered to the coal sample and connected with the resistance strain gauge through a lead, and the resistance strain gauge is connected with a computer; the vacuumizing end of the vacuum pump is connected with the adsorption connecting pipe through a vacuumizing connecting pipe; the high-pressure gas cylinder is communicated with the reference tank through an inflation connecting pipe. The utility model discloses can accomplish the synchronous test of the deflection-the adsorption capacity of gas adsorption desorption in-process coal sample under the different pressure gradients, make the adsorption capacity who surveys and the error of true adsorption capacity reduce, can obtain the dynamics curve of gas adsorption capacity among the adsorption process.
Description
Technical Field
The utility model relates to a gas experimental apparatus technical field, specific theory relates to a deformation-adsorption capacity synchronous testing arrangement of gas process is adsorbed to coal body.
background
At present, a plurality of important technical problems still face in the coal bed gas extraction, in order to ensure the coal mine production safety and guarantee the national energy safety, the future research of the coal industry in China is mainly put on the coal mine gas disaster prevention and control and the coal bed gas exploration and development, and the research of the coal industry in China is carried out on the basis of the gas content test and the gas adsorption and desorption characteristics. Coal is a complex multi-phase medium, and when the coal adsorbs and desorbs the gas, not only can the physical and mechanical properties of the coal be changed, but also the permeability, the stress state distribution and the strength of the coal can be changed. In particular, the matrix expansion deformation of the coal body in the gas adsorption process can cause the diffusion capacity of the coal body to dynamically change, which has important influence on both coal and gas outburst prevention and treatment and ground coal bed gas extraction.
In recent years, with the increasing attention paid to the coal rock gas dynamic disaster occurrence mechanism, coal bed gas exploitation, coal bed sequestration and other technologies, many researchers have started research on coal rock adsorption, adsorption deformation and permeability measurement, and have successively developed technologies and devices for testing coal rock adsorption capacity and adsorption and desorption deformation. Although these devices are developed for measuring the adsorption and desorption deformation of coal, it is difficult to measure the adsorption and deformation of coal simultaneously on a single sample, and at present, the number of such experimental devices is very small, and the experimental conditions are often not satisfactory. If the adsorption equilibrium time of the existing equipment is short, the equilibrium time of most experiments is within dozens of hours, and the adsorption deformation test block-shaped coal sample is different from the granular coal sample, especially when the raw coal is used for the experiments, the adsorption equilibrium time of the coal body is much longer, the balance can be achieved within hundreds of hours in some cases, and the existing equipment is limited by the stability and can not achieve the requirement; most of the gas pressure of adsorption and desorption deformation experiments carried out by the existing equipment is within 5.0MPa, and coal bodies often show different characteristics from those of coal bodies under high pressure, so that a testing device (0-10.0 MPa) capable of realizing high-pressure adsorption deformation is needed; in addition, when the existing volumetric method testing equipment calculates the adsorption capacity, the influence of the adsorption and desorption deformation of the coal body on the volume of the free space is ignored, so that a certain error exists between the measured adsorption capacity and the real adsorption capacity.
By testing the adsorption quantity of different adsorption equilibrium pressure points and then connecting the adsorption quantity of each adsorption point, namely an adsorption isotherm, the adsorption isotherm formed by connecting the gas adsorption quantity data points in equilibrium state under different gas pressures is very important in the aspects of evaluating the adsorption capacity of coal, predicting the gas content of a coal bed, evaluating the sequestration capacity, calculating the occurrence stock of the coal bed gas and the like, and the current equilibrium state coal gas adsorption isotherm can only be used for researching the adsorption capacity of the coal and the gas in an adsorption equilibrium state. However, when coal bed gas development, coal mine gas emission amount prediction, gas extraction effect investigation, and other work are performed, it is necessary to grasp the dynamic change of the gas adsorption amount of the coal body with time during the dynamic diffusion process in which the coal body and the gas are always in a non-adsorption equilibrium state.
in order to solve the above problems, people are always seeking an ideal technical solution.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a synchronous testing arrangement of deflection-adsorption capacity of gas process is adsorbed to the coal body, the device can accomplish the synchronous test of the deflection-adsorption capacity of gas adsorption desorption in-process coal appearance under the different pressure gradients, the deflection that combines the coal body carries out appropriate correction to the adsorption capacity of surveying, the error that makes the adsorption capacity and the true adsorption capacity that record reduces, and easy operation, temperature and pressure in real-time recording reference jar and the coal appearance jar, calculate the change of gas adsorption capacity along with time according to temperature and pressure, thereby can obtain the dynamics curve of gas adsorption capacity in the adsorption process.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
The synchronous deformation-adsorption capacity testing device for the gas adsorption process of the coal body comprises an adsorption diffusion system, a constant-temperature water bath system, an expansion deformation testing system, a vacuum pumping system and a high-pressure inflation system; the adsorption diffusion system comprises a reference tank and a coal sample tank, the reference tank and the coal sample tank are communicated through an adsorption connecting pipe, a first stop valve is arranged on the adsorption connecting pipe, self-storage temperature and pressure sensors are arranged in the reference tank and the coal sample tank, a coal sample is arranged in the coal sample tank, the reference tank is connected with a first pressure gauge and a first exhaust valve, and the coal sample tank is connected with a second pressure gauge and a second exhaust valve;
the constant-temperature water bath system comprises a constant-temperature water bath box, and the reference tank and the coal sample tank are arranged in the constant-temperature water bath box in parallel from left to right;
the expansion deformation testing system comprises a resistance strain gauge, a resistance strain gauge and a computer, wherein the resistance strain gauge is adhered to the coal sample and is connected with the resistance strain gauge through a lead, and the resistance strain gauge is connected with the computer;
the vacuumizing system comprises a vacuum pump, the vacuumizing end of the vacuum pump is connected with the adsorption connecting pipe through an air exhaust connecting pipe, and a second stop valve and a vacuum gauge are arranged on the air exhaust connecting pipe;
The high-pressure gas charging system comprises a high-pressure gas cylinder and a gas charging connecting pipe, the high-pressure gas cylinder is communicated with the reference tank through the gas charging connecting pipe, a third stop valve is arranged on the gas charging connecting pipe, and a pressure reduction regulating valve is arranged at an outlet of the high-pressure gas cylinder.
the reference tank comprises a first tank barrel and a first tank cover arranged at the top of the first tank barrel, a first sealing washer is arranged between the first tank barrel and the first tank cover, a first lower radial boss is arranged on the excircle of the top of the first tank barrel, a first upper radial boss matched and attached with the first lower radial boss is arranged on the excircle of the upper portion of the first tank cover, the first tank cover and the first tank barrel are connected in a buckling mode through a first fastening hoop, the first fastening hoop comprises a first hoop part and a second hoop part, the first hoop part and the second hoop part are symmetrically hooped on the outer circumference of the connection position of the first tank barrel cover and the first tank barrel, clamping grooves are formed in the inner sides of the first hoop part and the second hoop part, the first lower radial boss and the second upper radial boss are clamped through the two clamping grooves in a matching mode, and the two ends of the first hoop part and the second hoop part are connected through a locking buckle assembly in a buckling mode respectively;
Be equipped with the first subassembly of opening to cover on the first bung, the first subassembly of opening to cover includes two screw rods, and the interior disc left and right sides symmetry of radial boss respectively has seted up a screw hole on the first, and two screw rods correspond threaded connection respectively in two screw holes, and the lower extreme of two screw rods passes radial boss on the first and contacts with the interior disc upper surface top crimping of radial boss on the first.
Penetrating first gas interface about being equipped with on the first bung, the top of first bung is provided with left four-way connection, first gas interface is connected through first breather pipe with left four-way connection's lower port, left side four-way connection's left end port is connected with the right-hand member gas outlet of gas connection pipe, left side four-way connection's right-hand member port is connected with the left end air inlet of adsorption connection pipe, left side four-way connection's upper port is connected with first pressure pipe, first manometer is established at the top of first pressure pipe, be connected with first blast pipe on the first pressure pipe between first manometer and the left four-way connection, first blast pipe is established on first blast pipe.
the coal sample tank comprises a second tank barrel and a second tank cover arranged at the top of the second tank barrel, a second sealing washer is arranged between the second tank barrel and the second tank cover, a second lower radial boss is arranged on the top excircle of the second tank barrel, a second upper radial boss matched with the second lower radial boss is arranged on the upper excircle of the second tank cover, the second tank cover and the second tank barrel are connected through a second fastening clamp buckle, the second fastening clamp is identical to the first fastening clamp in structure, the second tank cover is provided with a second opening component, and the second opening component is identical to the first opening component in structure.
A second gas interface and a stress strain measurement interface which are vertically through are arranged on the second barrel cover, a right four-way joint is arranged above the second barrel cover, the second gas interface is connected with a lower port of the right four-way joint through a second vent pipe, a left port of the right four-way joint is connected with a right gas outlet of the adsorption connecting pipe, a right port of the right four-way joint is connected with a left gas inlet of the air exhaust connecting pipe, an upper port of the right four-way joint is connected with a second pressure pipe, a second pressure gauge is arranged at the top of the second pressure pipe, a second vent pipe is connected on a second pressure pipe between the second pressure gauge and the right four-way joint, and a second vent valve is arranged on the second; the first stop valve is arranged on the adsorption connecting pipe between the left four-way connector and the right four-way connector, the stress-strain measurement interface is hermetically connected with a flat cable through hole pipe, a wire penetrates through the flat cable through hole pipe and extends out of the second tank, and epoxy resin glue is filled in the flat cable through hole pipe to seal the wire.
By adopting the technical scheme, the experimental steps of the deformation-adsorption capacity synchronous testing device in the process of gas adsorption of the coal body are as follows:
Step 1, coal sample preparation
The experimental coal sample is rich coal from a flat coal second mine Taiyuan Heng 20 coal seam, about 20 kilograms of fresh large-scale massive coal samples are collected on the digging working face of the second mine, and are immediately sealed in a waxing mode after being sent into a laboratory, so that the coal samples are prevented from being in contact with air for a long time, and the oxidation influence before the samples are manufactured is reduced. The experiment designs that the gas diffusion dynamics and the coal sample expansion deformation characteristics are synchronously measured, so that the coal sample is firstly screened into fine particles of 60-80 meshes, and one part of the fine particles is used for directly testing the gas diffusion dynamics; the other part is pressed into a square coal briquette with the height of 60 multiplied by 20mm so as to facilitate the pasting of the strain gauge and meet the synchronous test of absorption diffusion and expansion deformation:
Coal sample drying: putting the coal sample into a vacuum chamber of a drying oven, setting the drying temperature to be 105 ℃, baking for 12 hours to remove the moisture in the coal sample, and then putting the coal sample into a dryer for natural cooling;
(ii) coal sample weighing: measuring the weight of the dry and cooled coal sample by using a high-precision electronic balance, keeping the precision within +/-0.01 g, weighing each coal sample for 3 times, and taking the average value as the final result weight of the coal sample;
(iii) coal sample cleaning: transferring the weighed coal sample into a coal sample tank of an experimental test system, then filling pure nitrogen with the pressure of 0.1MPa into the coal sample tank, and performing displacement washing on residual gas in the clean coal sample; it is important to note that the time that the coal sample is weighed and transferred into the coal sample tank is as short as possible to reduce the time that the coal sample is exposed to atmospheric pressure.
step 2, volume calibration
In order to obtain real and accurate experimental data, in the experimental preparation stage, the device is checked to ensure that the system is reliably connected, the air tightness of the device is checked, and then the volume of the tank body (the coal sample tank and the reference tank) and the system is measured;
(a) the volume calibration method comprises the following steps: the volume of the coal sample is calibrated by adopting a helium replacement method, and the volume of the tank body is calibrated by adopting a method of vacuum air suck-back, namely, water is pressed into a measuring cylinder connected with a vacuumized object by adopting atmospheric pressure, and the volume of the increase of the water amount in the measuring cylinder is tested to obtain a test result;
(b) Volume calibration object: the void volume of the coal sample tank V1; reference can void volume V2; a coal sample volume V3, the difference between the void volume of a coal sample tank filled with a coal sample and the void volume of a coal sample tank not filled with a coal sample;
(c) Volume calibration: taking the calibration of the space volume of the reference tank as an example, the third stop valve, the first exhaust valve and the second exhaust valve are closed, then the first stop valve and the second stop valve are opened to communicate the reference tank with the exhaust connecting pipe, the vacuum pump is started to vacuumize the interior of the reference tank until the pressure reaches 10Pa, the vacuum pump is stopped, and the first stop valve and the second stop valve are closed; then communicating an exhaust port of the first exhaust pipe with the upper part of a gas analyzer through a rubber flexible rubber hose, placing the lower part of the gas analyzer in a water tank filled with saturated salt water, firstly reading the reading h1 of the initial liquid level height value in the gas analyzer, and recording the temperature, the pressure and the water temperature in the water tank of the experimental environment; then slowly opening the first exhaust valve, wherein the reference tank is in a vacuum state, the pressure is low, the external air pressure continuously presses a liquid column in the gas analyzer, the liquid column in the gas analyzer rises, the final liquid level height h2 reading in the gas analyzer is recorded, and the volume of a burette corresponding to the difference between the h2 reading and the h1 reading is the measured reference tank void volume V, namely V2= V-V4= h2 reading-h 1 reading;
(d) and (3) data recording: repeating the test and conversion processes for 5 times, and taking the average value as the final volume of the measured object;
V m V s (e) and (3) standard condition volume conversion: the final volume Vm of the test is converted to the volume Vs in the standard condition by the following conversion formula:
V s V m P w t w P atm t t t t w Wherein Vs and Vm are the standard state volume and the measured final volume, ml, respectively; pw is saturated water vapor pressure, kPa, under the condition of testing water temperature tw, and the value is referred to coal industry standard MT/T752-1997; patm is atmospheric pressure, kPa; 0.02tr is a pressure correction value of mercury expansibility of the movable groove type pressure gauge along with the change of room temperature tr, and is kPa; tr and tw are the temperature of the laboratory and the water temperature in the gas analyzer, respectively, and are respectively DEG C; and finally, disassembling the gas analyzer.
step 3, adsorption deformation synchronous test experiment
This experiment sets up 10 pressure step experiments, does respectively: 0.1MPa, 0.5MPa, 1.0MPa, 1.5MPa, 2.0MPa, 2.5MPa, 3.0MPa, 4.0MPa, 5.0MPa, 6.0 MPa; the detailed procedure of experimental testing is as follows:
(1) pasting a resistance strain gauge: adhering the resistance strain gauge to the surface of the coal sample;
And (3) checking air tightness: after the coal sample is filled into the coal sample tank, the air tightness of the whole experiment system is carefully checked;
(2) vacuumizing: opening the first stop valve and the second stop valve, closing the third stop valve, the first exhaust valve and the second exhaust valve, starting the vacuum pump, vacuumizing the interiors of the coal sample tank and the reference tank by the vacuum pump, stopping the vacuum pump when the pressure is stabilized to 10Pa, and closing all the valves;
(3) gas injection: adjusting the temperature of the constant temperature water bath tank to a preset value, opening a switch and a third stop valve of the high-pressure gas cylinder, injecting gas (free phase) with set pressure into the reference tank through the pressure reduction regulating valve, and closing the switch and the third stop valve of the high-pressure gas cylinder;
(4) Adsorption: and opening the first stop valve, allowing the free-phase gas in the reference tank to enter the coal sample tank to be adsorbed with the coal sample, and closing the first stop valve when the adsorption is balanced. It should be noted that the time required for adsorption equilibrium in different pressure steps is different, the display pressures of the first pressure gauge and the second pressure gauge are equal to each other and stable and unchanged for a long time, namely, the adsorption equilibrium is judged, and the time required for equilibrium and the pressure during equilibrium are recorded for data processing;
(5) Repeating the step (3) and the step (4) until 10 set pressure steps are completed;
(6) end of experiment
And (5) collating the experimental records, and analyzing and calculating experimental data.
compared with the prior art, the utility model has substantive characteristics and progress, in particular to a reference tank and a coal sample tank self-storage type temperature and pressure sensor, a coal sample is arranged in the coal sample tank, a resistance strain gauge is pasted on the coal sample and is connected with a resistance strain gauge outside the coal sample tank through a lead, the resistance strain gauge is connected with a computer, then the signal of the resistance strain gauge is transmitted to the resistance strain gauge, the resistance strain gauge inputs each signal into the computer, the reference tank and the coal sample tank are arranged in a constant temperature water bath box side by side at the left and the right, a high pressure gas cylinder is communicated with the reference tank through an inflation connecting pipe, thereby realizing the gas adsorption dynamic process test under the conditions of constant temperature, constant volume and constant volume temperature, the outlet of the high pressure gas cylinder is provided with a decompression adjusting valve, thus, gas with different pressures can be provided, then the device can complete the synchronous test of the deformation-adsorption capacity of the coal sample in the gas adsorption and desorption process under different pressure gradients, the deformation and the adsorption capacity of the coal body are measured, and the measured adsorption capacity is properly corrected by combining the deformation of the coal body, so that the error between the measured adsorption capacity and the real adsorption capacity is reduced, the measured adsorption capacity is more accurate, and the method has wide application value in the fields of oil and gas field exploitation, shale gas exploitation, nuclear waste treatment and the like; the self-storage temperature and pressure sensor in the reference tank can record the temperature and pressure fluctuation condition in the reference tank in real time in the process of charging the gas into the reference tank so as to accurately calculate and obtain the actual gas quantity provided by the high-pressure gas cylinder; after the gas is filled, the third stop valve is closed, the first stop valve is opened, gas enters the coal sample tank from the reference tank through the adsorption connecting pipe, the adsorption process starts, the self-storage temperature and pressure sensors in the reference tank and the coal sample tank respectively record the temperature and the pressure in the reference tank and the coal sample tank in real time, and the change of the gas adsorption amount along with the time is calculated according to the temperature and the pressure, so that a dynamic curve of the gas adsorption amount in the adsorption process can be obtained.
The high-pressure adsorption and desorption testing system of the device has high stability, good sealing performance and high strength, and can meet the requirements of higher gas adsorption pressure and longer adsorption time.
the super constant temperature water bath of this device can make the system temperature invariable, gets rid of the different interference of air supply temperature, makes coal sample gas adsorb desorption process and go on under same temperature, can realize the integrality and the continuity of experiment.
The experimental device is simple to operate and wide in application, can simulate the field conditions of gas adsorption and desorption problems such as mine coal rock gas dynamic disaster evolution, coal bed gas extraction or coal bed gas development and coal bed sealing more truly, and provides indoor experimental research conditions for deeper research.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of a reference tank of the present invention.
fig. 3 is a top view of a reference tank of the present invention.
Fig. 4 is a schematic structural diagram of the coal sample tank of the present invention.
Detailed Description
the embodiments of the present invention will be further explained with reference to the drawings.
as shown in fig. 1-4, the deformation-adsorption synchronous testing device for the process of gas adsorption by coal includes an adsorption diffusion system, a constant temperature water bath system, an expansion deformation testing system, a vacuum pumping system and a high pressure gas charging system; the adsorption diffusion system comprises a reference tank 1 and a coal sample tank 2, the reference tank 1 is communicated with the coal sample tank 2 through an adsorption connecting pipe 3, a first stop valve 4 is arranged on the adsorption connecting pipe 3, self-storage temperature and pressure sensors 5 are arranged in the reference tank 1 and the coal sample tank 2, a coal sample 6 is arranged in the coal sample tank 2, the reference tank 1 is connected with a first pressure gauge 7 and a first exhaust valve 8, and the coal sample tank 2 is connected with a second pressure gauge 9 and a second exhaust valve 10;
The constant-temperature water bath system comprises a constant-temperature water bath tank 11, and the reference tank 1 and the coal sample tank 2 are arranged in the constant-temperature water bath tank 11 in a left-right side-by-side manner;
the expansion deformation testing system comprises a resistance strain gauge 12, a resistance strain gauge 13 and a computer 14, wherein the resistance strain gauge 12 is adhered to the coal sample 6 and is connected with the resistance strain gauge 13 through a lead 15, and the resistance strain gauge 13 is connected with the computer 14;
The vacuumizing system comprises a vacuum pump 16, the vacuumizing end of the vacuum pump 16 is connected with the adsorption connecting pipe 3 through a vacuumizing connecting pipe 17, and a second stop valve 18 and a vacuum gauge 19 are arranged on the vacuumizing connecting pipe 17;
The high-pressure gas charging system comprises a high-pressure gas cylinder 20 and a gas charging connecting pipe 21, the high-pressure gas cylinder 20 is communicated with the reference tank 1 through the gas charging connecting pipe 21, a third stop valve 22 is arranged on the gas charging connecting pipe 21, and a pressure reducing regulating valve 23 is arranged at the outlet of the high-pressure gas cylinder 20.
The reference tank 1 comprises a first tank barrel 24 and a first tank cover 25 arranged at the top of the first tank barrel 24, a first sealing washer 26 is arranged between the first tank barrel 24 and the first tank cover 25, a first lower radial boss 27 is arranged on the top excircle of the first tank barrel 24, a first upper radial boss 28 matched and attached with the first lower radial boss 27 is arranged on the upper excircle of the first tank cover 25, the first tank cover 25 and the first tank barrel 24 are buckled and connected through a first fastening hoop, the first fastening hoop comprises a first hoop part 29 and a second hoop part 30, the first hoop part 29 and the second hoop part 30 are symmetrically hooped on the outer circumference of the joint of the first tank barrel 25 and the first tank barrel 24, clamping grooves are arranged on the inner sides of the first hoop part 29 and the second hoop part 30, the two clamping grooves are matched and clamp the first lower radial boss 27 and the first upper radial boss 28, and two ends of the first hoop part 29 and the second hoop part 30 are respectively buckled and connected through a buckling assembly 31; the latch assembly 31 is conventional, and the detailed structure and operation thereof are not described in detail.
The first barrel cover 25 is provided with a first cover opening assembly, the first cover opening assembly comprises two screw rods 32, the left side and the right side of the inner circle edge of the first upper radial boss 28 are symmetrically provided with a threaded hole respectively, the two screw rods 32 are correspondingly and respectively in threaded connection with the two threaded holes, and the lower ends of the two screw rods 32 penetrate through the first upper radial boss 28 and are in top pressure contact with the upper surface of the inner circle edge of the first lower radial boss 27.
be equipped with first gas interface penetrating from top to bottom on the first bung 25, the top of first bung 25 is provided with left four-way connection 33, first gas interface is connected through first breather pipe 34 with the lower port of left four-way connection 33, the left end port of left four-way connection 33 is connected with the right-hand member gas outlet of gas connection pipe 21, the right port of left four-way connection 33 is connected with the left end air inlet of adsorbing connection pipe 3, the last port of left four-way connection 33 is connected with first pressure pipe 35, first manometer 7 is established at the top of first pressure pipe 35, be connected with first blast pipe 36 on the first pressure pipe 35 between first manometer 7 and the left four-way connection 33, first blast pipe 8 is established on first blast pipe 36.
Coal sample jar 2 includes second jar bucket 37 and sets up the second bung 38 at second jar bucket 37 top, be equipped with second seal ring 39 between second jar bucket 37 and the second bung 38, the top excircle of second jar bucket 37 is equipped with radial boss 40 under the second, the upper portion excircle of second bung 38 is equipped with and matches radial boss 41 on the second of laminating with radial boss 40 under the second, second bung 38 passes through second fastening clamp lock connection with second jar bucket 37, the second fastening clamp is the same with the structure of first fastening clamp, second bung 38 is equipped with the second and opens the lid subassembly, the second opens the lid subassembly and opens the lid subassembly the same with first structure that opens.
A second gas interface and a stress strain measurement interface which are vertically through are arranged on the second barrel cover 38, a right four-way joint 42 is arranged above the second barrel cover 38, the second gas interface is connected with a lower port of the right four-way joint 42 through a second vent pipe 43, a left port of the right four-way joint 42 is connected with a right gas outlet of the adsorption connecting pipe 3, a right port of the right four-way joint 33 is connected with a left gas inlet of the air suction connecting pipe 17, an upper port of the right four-way joint 42 is connected with a second pressure pipe 44, a second pressure gauge 9 is arranged at the top of the second pressure pipe 44, a second vent pipe 45 is connected on the second pressure pipe 44 between the second pressure gauge 9 and the right four-way joint 42, and a second vent valve 10 is arranged on the second vent pipe; the first stop valve 4 is arranged on the adsorption connecting pipe 3 between the left four-way connector 33 and the right four-way connector 42, the stress-strain measurement interface is hermetically connected with a flat cable through hole pipe 46, the lead 15 penetrates through the flat cable through hole pipe 46 and extends out of the second tank barrel 37, and the flat cable through hole pipe 46 is filled with epoxy resin glue to seal the lead 15.
The reference tank 1 and the coal sample tank 2 are made of customized stainless steel materials, the height of the tank body is 20cm, the wall thickness is 2cm, the volume of the tank body is about 2260cm3, and the pressure resistance is 10 MPa. The first pressure gauge 7 and the second pressure gauge 9 are YB-150ZT precision pressure gauges manufactured by China Red flag Instrument Limited, the measuring range is 0-16 MPa, the precision is 0.25 grade, and the minimum scale is 0.1 MPa.
The self-storage type temperature and pressure sensor 5 is a temperature and pressure sensor with a self-storage function produced by American Omega company. The self-storage type temperature and pressure sensor 5 is placed in the coal sample tank 2 and the reference tank 1, and the instantaneous changes along with the temperature and the pressure in the two tank bodies are automatically recorded so as to meet the requirement of accurately measuring the density of the free phase. The pressure testing range of the self-storage type temperature and pressure sensor 5 is 0-10 MPa, the precision is 0.1Pa, the temperature testing range is-20-100 ℃, and the precision is 0.1 ℃.
The resistance strain gauge 13 adopts an XL210A4 type static resistance strain gauge 13 produced by Qinhuang island collaborative science and technology development limited, and the gauge can simultaneously measure three physical quantities of strain, tension and pressure and displacement and has the functions of peak value measurement, data storage, data playback and the like. The resistance strain gauge 13 has 4 channels in total, namely can support 4 resistance strain gauges 12 to measure simultaneously at most, the measuring range is +/-38000 mu epsilon, the measuring precision is 0.1%, the time zero drift is less than or equal to 3 mu epsilon/4 h, and the temperature drift is less than or equal to 1 mu epsilon/DEG C.
The constant temperature water bath tank 11 is an HH-601 type super constant temperature water bath tank 11, and the technical parameters are as follows: constant temperature fluctuation: heating power is 1000W at the temperature of less than or equal to 0.1 ℃; temperature range: room temperature +5 ℃ to 95 ℃; the flow rate of the water pump: the power is more than or equal to 4L/min and 40W; the size of the inner container is 400 multiplied by 300 multiplied by 180 mm.
the vacuum pump 16 is a 2XZ-1 type rotary vane vacuum pump 16 produced by Shanghai vacuum pump 16 factory, which is a basic device for obtaining vacuum by pumping gas out of a closed container, has the characteristics of small volume and light weight, and is particularly suitable for precision instruments and laboratories. The technical parameters of the vacuum pump 16 are as follows: the air pumping speed is 1L/s; ultimate vacuum 6.7X 10-2 Pa; the rotating speed is 1400 revolutions per minute; the motor power is 0.25 KW; the working voltage is 20V; the diameter of the air inlet is 15 mm. The vacuum gauge 19 is a Sichuan Nanguan ZDZ-52 type resistance vacuum gauge, and the specific technical parameters are as follows: the measurement range is 1.0 multiplied by 105 to 1.0 multiplied by 10 < -1 > Pa; the control range is 1.0 multiplied by 105 to 1.0 multiplied by 10 < -1 > Pa; the control precision is +/-1%; the load is AC 220V/3A and is a non-inductive load; the response time is less than or equal to 1 s.
The gas in the high-pressure gas cylinder 20 is high-purity methane gas with a concentration of 99.9% and a pressure of 13.6MPa, which is produced by Beijing Heipipu gas company.
The deformation-adsorption capacity synchronous test experiment step in the gas adsorption process of the coal body comprises the following steps:
step 1, coal sample preparation
the experimental coal sample 6 is rich coal from a flat coal second mine Taiyuan Heng 20 coal seam, about 20 kilograms of fresh large-scale massive coal samples are collected on a second mine excavation working face and are immediately sealed in a waxing mode after being sent into a laboratory, so that the coal samples are prevented from being in contact with air for a long time, and the oxidation influence before sample preparation is reduced. The experiment designs that the gas diffusion dynamics and the coal sample expansion deformation characteristics are synchronously measured, so that the coal sample is firstly screened into fine particles of 60-80 meshes, and one part of the fine particles is used for directly testing the gas diffusion dynamics; the other part is pressed into a square coal briquette with the height of 60 multiplied by 20mm so as to facilitate the pasting of the strain gauge and meet the synchronous test of absorption diffusion and expansion deformation:
coal sample drying: putting the coal sample into a vacuum chamber of a drying oven, setting the drying temperature to be 105 ℃, baking for 12 hours to remove the moisture in the coal sample, and then putting the coal sample into a dryer for natural cooling;
(ii) coal sample weighing: measuring the weight of the dry and cooled coal sample by using a high-precision electronic balance, keeping the precision within +/-0.01 g, weighing each coal sample for 3 times, and taking the average value as the final result weight of the coal sample;
(iii) coal sample cleaning: transferring the weighed coal sample into a coal sample tank 2 of an experimental test system, then filling pure nitrogen with the pressure of 0.1MPa into the coal sample tank 2, and performing displacement washing on residual gas in the clean coal sample; it is to be noted that the time during which the coal sample is weighed and transferred into the coal sample tank 2 is as short as possible to reduce the time during which the coal sample is exposed to atmospheric pressure.
Step 2, volume calibration
In order to obtain real and accurate experimental data, in the experimental preparation stage, the device is checked to ensure that the system is reliably connected, the air tightness of the device is checked, and then the volume of the tank body (the coal sample tank 2 and the reference tank 1) and the system is measured;
(a) The volume calibration method comprises the following steps: the volume of the coal sample is calibrated by adopting a helium replacement method, and the volume of the tank body is calibrated by adopting a vacuum air back-suction method, namely, water is pressed into a measuring cylinder connected with a vacuumized object by adopting atmospheric pressure, and the volume of the increase of the water amount in the measuring cylinder is tested to obtain a test result;
(b) Volume calibration object: void volume V1 of coal sample tank 2; reference tank 1 void volume V2; a coal sample volume V3, which is the difference between the void volume of the coal sample tank 2 filled with the coal sample and the void volume of the coal sample tank 2 not filled with the coal sample;
(c) volume calibration: taking the calibration of the void volume of the reference tank 1 as an example, the third stop valve 22, the first exhaust valve 8 and the second exhaust valve 10 are closed, then the first stop valve 4 and the second stop valve 18 are opened to communicate the reference tank 1 with the exhaust connecting pipe 17, the vacuum pump 16 is started to vacuumize the interior of the reference tank 1 to 10Pa, the vacuum pump 16 is stopped, and the first stop valve 4 and the second stop valve 18 are closed; then, communicating an exhaust port of the first exhaust pipe 36 with the upper part of a gas analyzer through a rubber flexible rubber hose, placing the lower part of the gas analyzer in a water tank filled with saturated salt water, firstly reading the reading h1 of the initial liquid level height value in the gas analyzer, and recording the temperature, the pressure and the water temperature in the water tank of the experiment environment; then slowly opening the first exhaust valve 8, because the interior of the reference tank 1 is in a vacuum state, and the pressure is low, the external air pressure continues to press a liquid column in the gas analyzer, so that the liquid column in the gas analyzer rises, the final liquid level height h2 reading in the gas analyzer is recorded, and the volume of the burette corresponding to the difference between the h2 reading and the h1 reading is the measured void volume V of the reference tank 1, namely V2= V-V4= h2 reading-h 1 reading;
(d) and (3) data recording: repeating the test and conversion processes for 5 times, and taking the average value as the final volume of the measured object;
V m V s (e) And (3) standard condition volume conversion: the final volume Vm of the test is converted to the volume Vs in the standard condition by the following conversion formula:
V s V m P w t w P atm t t t t w Wherein Vs and Vm are the standard state volume and the measured final volume, ml, respectively; pw is saturated water vapor pressure, kPa, under the condition of testing water temperature tw, and the value is referred to coal industry standard MT/T752-1997; patm is atmospheric pressure, kPa; 0.02tr is a pressure correction value of mercury expansibility of the movable groove type pressure gauge along with the change of room temperature tr, and is kPa; tr and tw are the temperature of the laboratory and the water temperature in the gas analyzer, respectively, and are respectively DEG C; and finally, disassembling the gas analyzer.
Step 3, adsorption deformation synchronous test experiment
This experiment sets up 10 pressure step experiments, does respectively: 0.1MPa, 0.5MPa, 1.0MPa, 1.5MPa, 2.0MPa, 2.5MPa, 3.0MPa, 4.0MPa, 5.0MPa, 6.0 MPa; the detailed procedure of experimental testing is as follows:
(1) pasting the resistance strain gauge 12: adhering the resistance strain gauge 12 to the surface of the coal sample;
and (3) checking air tightness: after the coal sample 6 is filled into the coal sample tank 2, the air tightness of the whole experiment system is carefully checked;
(2) Vacuumizing: opening the first stop valve 4 and the second stop valve 18, closing the third stop valve 22, the first exhaust valve 8 and the second exhaust valve 10, starting the vacuum pump 16, vacuumizing the interiors of the coal sample tank 2 and the reference tank 1 by the vacuum pump 16, stopping the vacuum pump 16 when the pressure is stabilized to 10Pa, and closing all the valves;
(3) Gas injection: adjusting the temperature of the constant temperature water bath tank 11 to a preset value, opening a switch of the high pressure gas cylinder 20 and a third stop valve 22, injecting gas (free phase) with set pressure into the reference tank 1 through a pressure reduction adjusting valve 23, and closing the switch of the high pressure gas cylinder 20 and the third stop valve 22;
(4) Adsorption: and opening the first stop valve 4, allowing the free-phase gas in the reference tank 1 to enter the coal sample tank 2 to be adsorbed with the coal sample 6, and closing the first stop valve 4 when the adsorption is balanced. It should be noted that the time required for adsorption equilibrium is different in different pressure steps, the display pressures of the first pressure gauge 7 and the second pressure gauge 9 are equal to each other and stable and unchanged for a long time, namely, the adsorption equilibrium is judged, and the time required for equilibrium and the pressure during equilibrium are recorded for data processing;
(5) Repeating the step (3) and the step (4) until 10 set pressure steps are completed;
(6) end of experiment
and (5) collating the experimental records, and analyzing and calculating experimental data.
the utility model discloses a reference jar 1 and coal sample jar 2 are all from storage formula temperature and pressure sensor 5, be equipped with coal sample 6 in the coal sample jar 2, it has resistance strain gauge 12 to paste on the coal sample 6, resistance strain gauge 12 passes through wire 15 and is connected with the resistance strain gauge 13 of coal sample jar 2 outside, resistance strain gauge 13 connects computer 14, then the signal transmission of resistance strain gauge 12 is to resistance strain gauge 13, resistance strain gauge 13 inputs each signal into computer 14 again, reference jar 1 and coal sample jar 2 are set up side by side in constant temperature water bath 11 about, high-pressure gas cylinder 20 communicates with reference jar 1 through aerifing connecting pipe 21, thereby can realize the gas adsorption dynamic process test under isothermal constant volume, constant volume temperature change condition, the export of high-pressure gas cylinder 20 is equipped with decompression governing valve 23, so, can provide the gas of different pressures, then the device can accomplish the deformation-the adsorption volume synchronous test of coal sample 6 in the gas desorption adsorption process under different pressure gradients, the deformation and the adsorption capacity of the coal body are measured, and the measured adsorption capacity is properly corrected by combining the deformation of the coal body, so that the error between the measured adsorption capacity and the real adsorption capacity is reduced, the measured adsorption capacity is more accurate, and the method has wide application value in the fields of oil and gas field exploitation, shale gas exploitation, nuclear waste treatment and the like; the self-storage temperature and pressure sensor 5 in the reference tank 1 can record the temperature and pressure fluctuation condition in the reference tank 1 in real time when the high-pressure gas cylinder 20 inflates the reference tank 1 so as to accurately calculate and obtain the actual gas quantity provided by the high-pressure gas cylinder 20; after the gas is filled, the third stop valve 22 is closed, the first stop valve 4 is opened, gas enters the coal sample tank 2 from the reference tank 1 through the adsorption connecting pipe 3, the adsorption process starts, the self-storage temperature and pressure sensors 5 in the reference tank 1 and the coal sample tank 2 respectively record the temperature and the pressure in the reference tank 1 and the coal sample tank 2 in real time, and the change of the gas adsorption amount along with the time is calculated according to the temperature and the pressure, so that the dynamic curve of the gas adsorption amount in the adsorption process can be obtained.
the high-pressure adsorption and desorption testing system of the device has high stability, good sealing performance and high strength, and can meet the requirements of higher gas adsorption pressure and longer adsorption time.
The super constant temperature water bath 11 of this device can make the system temperature invariable, gets rid of the different interference of air supply temperature, makes 6 gas of coal sample adsorb desorption processes and go on under same temperature, can realize the integrality and the continuity of experiment.
the experimental device is simple to operate and wide in application, can simulate the field conditions of gas adsorption and desorption problems such as mine coal rock gas dynamic disaster evolution, coal bed gas extraction or coal bed gas development and coal bed sealing more truly, and provides indoor experimental research conditions for deeper research.
the above embodiments are only used for illustrating but not limiting the technical solution of the present invention, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that; the present invention may be modified or substituted with equivalents without departing from the spirit and scope of the invention, which should be construed as being limited only by the claims.
Claims (5)
1. deformation-adsorption capacity synchronous testing device of coal body adsorbed gas process, its characterized in that: the device comprises an adsorption diffusion system, a constant-temperature water bath system, an expansion deformation testing system, a vacuum pumping system and a high-pressure inflation system; the adsorption diffusion system comprises a reference tank and a coal sample tank, the reference tank and the coal sample tank are communicated through an adsorption connecting pipe, a first stop valve is arranged on the adsorption connecting pipe, self-storage temperature and pressure sensors are arranged in the reference tank and the coal sample tank, a coal sample is arranged in the coal sample tank, the reference tank is connected with a first pressure gauge and a first exhaust valve, and the coal sample tank is connected with a second pressure gauge and a second exhaust valve;
the constant-temperature water bath system comprises a constant-temperature water bath box, and the reference tank and the coal sample tank are arranged in the constant-temperature water bath box in parallel from left to right;
the expansion deformation testing system comprises a resistance strain gauge, a resistance strain gauge and a computer, wherein the resistance strain gauge is adhered to the coal sample and is connected with the resistance strain gauge through a lead, and the resistance strain gauge is connected with the computer;
the vacuumizing system comprises a vacuum pump, the vacuumizing end of the vacuum pump is connected with the adsorption connecting pipe through an air exhaust connecting pipe, and a second stop valve and a vacuum gauge are arranged on the air exhaust connecting pipe;
The high-pressure gas charging system comprises a high-pressure gas cylinder and a gas charging connecting pipe, the high-pressure gas cylinder is communicated with the reference tank through the gas charging connecting pipe, a third stop valve is arranged on the gas charging connecting pipe, and a pressure reduction regulating valve is arranged at an outlet of the high-pressure gas cylinder.
2. The device for synchronously testing the deformation and the adsorption capacity in the process of adsorbing the gas by the coal body according to claim 1, wherein: the reference tank comprises a first tank barrel and a first tank cover arranged at the top of the first tank barrel, a first sealing washer is arranged between the first tank barrel and the first tank cover, a first lower radial boss is arranged on the excircle of the top of the first tank barrel, a first upper radial boss matched and attached with the first lower radial boss is arranged on the excircle of the upper portion of the first tank cover, the first tank cover and the first tank barrel are connected in a buckling mode through a first fastening hoop, the first fastening hoop comprises a first hoop part and a second hoop part, the first hoop part and the second hoop part are symmetrically hooped on the outer circumference of the connection position of the first tank barrel cover and the first tank barrel, clamping grooves are formed in the inner sides of the first hoop part and the second hoop part, the first lower radial boss and the second upper radial boss are clamped through the two clamping grooves in a matching mode, and the two ends of the first hoop part and the second hoop part are connected through a locking buckle assembly in a buckling mode respectively;
be equipped with the first subassembly of opening to cover on the first bung, the first subassembly of opening to cover includes two screw rods, and the interior disc left and right sides symmetry of radial boss respectively has seted up a screw hole on the first, and two screw rods correspond threaded connection respectively in two screw holes, and the lower extreme of two screw rods passes radial boss on the first and contacts with the interior disc upper surface top crimping of radial boss on the first.
3. the device for synchronously testing the deformation and the adsorption capacity in the process of adsorbing the gas by the coal body according to claim 2, wherein: penetrating first gas interface about being equipped with on the first bung, the top of first bung is provided with left four-way connection, first gas interface is connected through first breather pipe with left four-way connection's lower port, left side four-way connection's left end port is connected with the right-hand member gas outlet of gas connection pipe, left side four-way connection's right-hand member port is connected with the left end air inlet of adsorption connection pipe, left side four-way connection's upper port is connected with first pressure pipe, first manometer is established at the top of first pressure pipe, be connected with first blast pipe on the first pressure pipe between first manometer and the left four-way connection, first blast pipe is established on first blast pipe.
4. The device for synchronously testing the deformation and the adsorption capacity in the process of adsorbing the gas by the coal body according to claim 3, wherein: the coal sample tank comprises a second tank barrel and a second tank cover arranged at the top of the second tank barrel, a second sealing washer is arranged between the second tank barrel and the second tank cover, a second lower radial boss is arranged on the top excircle of the second tank barrel, a second upper radial boss matched with the second lower radial boss is arranged on the upper excircle of the second tank cover, the second tank cover and the second tank barrel are connected through a second fastening clamp buckle, the second fastening clamp is identical to the first fastening clamp in structure, the second tank cover is provided with a second opening component, and the second opening component is identical to the first opening component in structure.
5. The device for synchronously testing the deformation and the adsorption capacity in the process of adsorbing the gas by the coal body according to claim 4, wherein: a second gas interface and a stress strain measurement interface which are vertically through are arranged on the second barrel cover, a right four-way joint is arranged above the second barrel cover, the second gas interface is connected with a lower port of the right four-way joint through a second vent pipe, a left port of the right four-way joint is connected with a right gas outlet of the adsorption connecting pipe, a right port of the right four-way joint is connected with a left gas inlet of the air exhaust connecting pipe, an upper port of the right four-way joint is connected with a second pressure pipe, a second pressure gauge is arranged at the top of the second pressure pipe, a second vent pipe is connected on a second pressure pipe between the second pressure gauge and the right four-way joint, and a second vent valve is arranged on the second; the first stop valve is arranged on the adsorption connecting pipe between the left four-way connector and the right four-way connector, the stress-strain measurement interface is hermetically connected with a flat cable through hole pipe, a wire penetrates through the flat cable through hole pipe and extends out of the second tank, and epoxy resin glue is filled in the flat cable through hole pipe to seal the wire.
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| CN111351740A (en) * | 2020-03-12 | 2020-06-30 | 青岛理工大学 | Device and method for measuring inward expansion deformation rate of three-dimensional coal matrix |
| CN111521516A (en) * | 2019-12-11 | 2020-08-11 | 南通市飞宇石油科技开发有限公司 | Coal body gas adsorption and strain test system |
| CN112432879A (en) * | 2020-09-18 | 2021-03-02 | 郑州大学 | Gas adsorption-desorption-recovery test device for coal body and test method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111521516A (en) * | 2019-12-11 | 2020-08-11 | 南通市飞宇石油科技开发有限公司 | Coal body gas adsorption and strain test system |
| CN111351740A (en) * | 2020-03-12 | 2020-06-30 | 青岛理工大学 | Device and method for measuring inward expansion deformation rate of three-dimensional coal matrix |
| CN111351740B (en) * | 2020-03-12 | 2022-06-07 | 青岛理工大学 | Device and method for measuring inward expansion deformation rate of three-dimensional coal matrix |
| CN112432879A (en) * | 2020-09-18 | 2021-03-02 | 郑州大学 | Gas adsorption-desorption-recovery test device for coal body and test method thereof |
| CN113607598A (en) * | 2021-07-30 | 2021-11-05 | 中国矿业大学 | Visual shale adsorption deformation test device and use method thereof |
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