CN113092271B - Supercritical fluid generation device, coal rock mechanical test system and test method - Google Patents
Supercritical fluid generation device, coal rock mechanical test system and test method Download PDFInfo
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- CN113092271B CN113092271B CN202110360800.4A CN202110360800A CN113092271B CN 113092271 B CN113092271 B CN 113092271B CN 202110360800 A CN202110360800 A CN 202110360800A CN 113092271 B CN113092271 B CN 113092271B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
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Abstract
本发明公开了一种超临界流体发生装置，包括发生装置本体（1），所述发生装置本体（1）包括位于中部的聚能剂舱（16）和位于所述聚能剂舱（16）外部的流体舱（12）；所述聚能剂舱（16）顶端设置有聚能剂进口（15）和激发端部（13）；所述聚能剂舱（16）内部设置有排废滑块（17），所述聚能剂舱（16）底端设置有液压油进口二（19）；所述液压油进口二（19）与液压泵二（18）相连。本发明还公开了包含所述的一种超临界流体发生装置的煤岩力学试验系统和试验方法。本发明促进对超临界流体处理煤岩宏观和微观力学性质改变的研究，为相关工程实践提供理论支撑。
The invention discloses a supercritical fluid generating device, comprising a generating device body (1), the generating device body (1) comprising an energy concentrating agent cabin (16) located in the middle and an energy condensing agent cabin (16) located in the middle An external fluid cabin (12); the top of the condensing agent cabin (16) is provided with an energy accumulating agent inlet (15) and an excitation end (13); a waste discharge slide is arranged inside the condensing agent cabin (16). Block (17), the bottom end of the energy accumulating agent cabin (16) is provided with a second hydraulic oil inlet (19); the second hydraulic oil inlet (19) is connected with a second hydraulic pump (18). The invention also discloses a coal rock mechanics test system and a test method comprising the supercritical fluid generating device. The invention promotes the research on the change of macroscopic and microscopic mechanical properties of coal and rock treated by supercritical fluid, and provides theoretical support for related engineering practice.
Description
Technical Field
The invention belongs to the technical field of rock mechanical tests, and particularly relates to a supercritical fluid generation device, a coal-rock mechanical test system and a test method.
Background
The critical pressure of carbon dioxide is 7.39MPa, the critical temperature is 31.06 ℃, the critical pressure of water is 22.12MPa, and the critical temperature is 374.3 ℃. When the environment of carbon dioxide and water exceeds critical temperature and critical pressure, the carbon dioxide and water enter into supercritical state, namely supercritical CO2And water is a supercritical fluid existing in a state of not being in a gaseous state but not in a liquid state, and it has characteristics of having a large solubility of a liquid solute and easy diffusion and movement of a gas, which has attracted a wide attention of the social circles and is being applied to various fields.
With the continuous development of unconventional oil and gas resource exploitation and underground storage technology, supercritical CO is adopted2Has been widely used, such as the application of supercritical CO in the development of oil and gas resources2Displacing coal bed gas and utilizing supercritical CO2Cracking and increasing permeability of the gun deep hole; for another example, in the currently popular carbon dioxide underground sealing technology, liquid carbon dioxide is injected into an unrecoverable coal seam, so that the purpose of sealing carbon dioxide is achieved on one hand, and on the other hand, gas in coal can be resolved out to realize gas yield increase; supercritical water is often used for the deep well to creep into, and at stratum depths stress high concentration, granite hardness is high, uses high temperature high pressure supercritical water to corrode the rock surface when kilometer rig is difficult to creep into, promotes the crack and takes place to improve greatly and creeps into efficiency.
In order to better realize supercritical CO2The application and development of the mixed water, and the comprehensive understanding and mastering of the supercritical CO2The mechanical property of the rock mass under the condition of water is very important, and for the underground carbon dioxide storage, the rock mass is known to be in the stress-temperature-supercritical CO2The creep, diffusion and erosion reactions of the fluid in a multi-field coupling environment under the action of a long time have great significance for compiling and designing an underground sealing scheme, guiding field construction and later maintenance, and for the supercritical water to improve the drilling efficiency, the mechanism for promoting the drilling efficiency is clarified, and the pressure and temperature parameters have great significance for influencing the drilling efficiency.
At present, the supercritical CO is applied to rock mass2In creep, diffusion and erosion research under water environment, related seepage diffusion theory and numerical simulation are difficult to predict accurately, and most of the research is carried out by means of laboratory tests, namely, a cylindrical rock mass test piece is immersed in supercritical CO in advance2And after the test piece is taken out and placed on a triaxial test machine after the test piece is immersed for a preset time, applying an axial load, and carrying out creep, seepage diffusion and erosion reaction tests by filling oil, loading and confining pressure, wherein in the above mode, when the creep, seepage diffusion and erosion reaction tests of the rock mass are carried out in a triaxial stress state, the test piece is separated from the supercritical CO2And (4) environment, large errors exist in the obtained test results.
Disclosure of Invention
The invention aims to solve the technical problem of providing a supercritical fluid generating device which can be used repeatedly, can realize automatic pressure relief and automatic gas circuit opening, is convenient for remote operation and is safe and reliable.
Meanwhile, the invention provides a coal rock mechanical test system and a test method comprising the supercritical fluid generation device, the test system is used for the supercritical fluid immersion treatment of the coal rock powder, the change of the micro mechanical property of the coal rock powder can be observed under the supercritical environment, and the theoretical support is provided for the relevant engineering practice.
Meanwhile, the invention provides a coal rock mechanical test system and a test method comprising the supercritical fluid generation device, the test system is coal rock mechanical test equipment for researching the influence of the supercritical fluid on the mechanical properties of coal rocks in a complex stress state, and the test system is used for a rock test caused by the supercritical fluid under triaxial surrounding pressure, promotes the research on the change of the macroscopic mechanical properties of the coal rocks processed by the supercritical fluid and provides theoretical support for related engineering practices.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a supercritical fluid generating apparatus comprising a generating apparatus body comprising a shaped-agent compartment in a central portion and a fluid compartment outside the shaped-agent compartment;
the fluid cabin is provided with a fluid inlet and a fluid outlet;
the fluid outlet comprises a horizontal pipe communicated with the fluid cabin, and the middle part of the horizontal pipe is communicated with a vertical pipe;
the tail end of the vertical pipe is provided with a connecting port, and the vertical pipe is connected with a temperature and pressure acquisition device;
the tail end of the horizontal pipe is provided with a first hydraulic oil inlet, the first hydraulic oil inlet is connected with a first hydraulic pump, and a pressure relief sliding block is arranged in the horizontal pipe;
the horizontal pipe comprises an inner diameter thin pipe and an inner diameter thick pipe which are integrally connected, the inner diameter thin pipe and the inner diameter thick pipe are transited through a first chamfer, the inner diameter thin pipe is located at one end, close to the fluid chamber, of the vertical pipe, and a second chamfer matched with the first chamfer is arranged on the pressure relief sliding block;
the top end of the energy collecting agent cabin is provided with an energy collecting agent inlet and an excitation end part; a waste discharge sliding block is arranged in the energy collecting agent cabin, and a second hydraulic oil inlet is formed in the bottom end of the energy collecting agent cabin; the second hydraulic oil inlet is connected with a second hydraulic pump;
valves are arranged on the excitation end part, the energy gathering agent inlet and the fluid inlet.
The excitation end is a boron nitride coated wire.
The connecting port is an internally threaded tube.
The pressure release slider with all be provided with the sealing washer groove on the outer wall of the slider of wasting discharge and be furnished with the sealing washer.
The inner wall of the energy gathering agent cabin is provided with a groove used for ensuring the waste discharge sliding block to move horizontally.
The fluid inlet, the energy collecting agent inlet, the first hydraulic oil inlet and the second hydraulic oil inlet are sealed by inlet sealing structures;
the inlet sealing structure comprises a pipeline penetrating through a bulkhead or a pipe wall, a bolt groove for mounting a bolt is formed in the periphery of the pipeline, a sealing gasket is arranged at the bottom of the bolt groove, the bolt is fixed by a nut, through holes matched with the pipeline are formed in the bolt and the nut, the pipeline penetrates through the pipeline, and the valve is arranged on the pipeline; the sealing gasket is a compressed sealing type metal wound gasket.
A coal rock mechanical test system of a supercritical fluid generating device is characterized in that a connecting port is connected with a powder reaction kettle;
the powder reaction kettle comprises a coal rock powder cabin, a detachable end part is hermetically arranged at an opening at the top end of the coal rock powder cabin, and a stop block used for limiting the detachable end part is arranged on the inner wall of the coal rock powder cabin;
a first air pipe penetrates through the detachable end part, a screwing thread used for being connected with the connecting port is arranged at the top end of the first air pipe, and a plurality of drill holes are formed in the bottom end of the first air pipe;
a temperature sensor II and a pressure sensor II are also arranged on the detachable end part;
the warm-pressing acquisition device comprises a first temperature sensor and a first pressure sensor;
the temperature sensor I, the pressure sensor I, the temperature sensor II and the pressure sensor II are sealed by a sensor sealing structure;
the sensor sealing structure comprises air vents and a mounting groove, the air vents are formed in the detachable end part and the vertical pipe in a slotted mode, the mounting groove is used for mounting a probe part of the sensor, the mounting groove is in threaded connection with the probe part, the air vents are communicated with the mounting groove, and a compression type rubber sealing ring is sleeved at the top end of the probe part; the probe part is connected with the shell part, and the outer diameter of the shell part is larger than that of the probe part; the diameter of the vent is the same as the diameter of the inner core of the sensor and is smaller than the diameter of the probe part;
the temperature sensor I, the pressure sensor I, the temperature sensor II and the pressure sensor II are respectively connected with a data acquisition instrument, and the data acquisition instrument is connected with the controller; the excitation end part is connected with the exciter through a lead; the temperature sensor I, the pressure sensor I, the temperature sensor II, the pressure sensor II, the data acquisition instrument, the controller and the exciter are all powered by a power supply.
The test method of the coal rock mechanical test system comprises the following steps:
s1, inputting the fluid into the fluid chamber from the fluid inlet, and then closing the valve; inputting an energy-gathering agent into an energy-gathering agent cabin through an energy-gathering agent inlet, then closing a valve, and pressurizing to a set pressure value through a pair of pressure-releasing sliding blocks of a hydraulic pump; the fluid comprising CO2Or water;
s2, detaching the detachable end part of the powder reaction kettle, placing the coal rock powder in a coal rock powder cabin, and screwing the detachable end part to finish sealing;
s3, connecting a connection port of a fluid outlet with a screwing thread on a first air pipe of a powder reaction kettle, installing a first temperature sensor and a first pressure sensor at the fluid outlet, connecting a data acquisition instrument and a controller, installing a second temperature sensor and a second pressure sensor of the powder reaction kettle, and connecting the data acquisition instrument and the controller;
s4, connecting a lead on the excitation end part with an exciter, exciting and igniting the energy-gathering agent through the exciter, and heating the fluid;
s5, when the heated pressure of the fluid reaches a set pressure value, the pressure relief sliding block retreats to start pressure relief, and the first temperature sensor and the first pressure sensor start to acquire data;
s6, after the temperature and the pressure of the coal rock powder reach a preset value, applying pressure to the pressure relief slide block through the hydraulic pump to close the fluid outlet, and after the coal rock reaction time reaches a set value, removing the gas circuit connection of the fluid outlet to obtain the coal rock powder after reaction;
and S7, after the reaction is finished, driving the waste discharging slide block to move upwards by using the second hydraulic pump, discharging waste residues from the energy collecting agent inlet, discharging the pressure of the second hydraulic pump after the reaction is finished, and returning the waste discharging slide block.
A coal rock mechanical test system of a supercritical fluid generating device is characterized in that a connecting port is connected with a true triaxial test bed;
the true triaxial test bed comprises a test bed rigid frame for placing a rock sample, wherein a middle hole is processed on the rock sample, and a second air pipe is prefabricated in the middle hole;
the rock sample applies three-axis confining pressure through a third hydraulic pump, and a metal gasket used for being in contact with the surface of the rock sample is arranged at the end of a hydraulic rod of the third hydraulic pump;
oblique angle drill holes are formed in opposite angles of the metal gasket, and a sound wave emission probe and a sound wave damage measuring probe penetrate through the oblique angle drill holes;
a breather pipe drill hole is formed in one of the pressing blocks on the three opposite surfaces of the hydraulic pump, and the second air pipe penetrates through the breather pipe drill hole and is connected with the connecting port;
the warm-pressing acquisition device comprises a first temperature sensor and a first pressure sensor;
the temperature sensor I, the pressure sensor I, the sound wave emission probe and the sound wave damage measuring probe are respectively connected with a data acquisition instrument, and the data acquisition instrument is connected with the controller; the excitation end part is connected with the exciter through a lead; the temperature sensor I, the pressure sensor I, the sound wave emission probe, the sound wave damage measuring probe, the data acquisition instrument, the controller and the exciter are all powered by a power supply.
The test method of the coal rock mechanical test system comprises the following steps:
s1, inputting the fluid into the fluid chamber from the fluid inlet, and then closing the valve; inputting the energy-gathering agent into the energy-gathering agent cabin through an energy-gathering agent inlet, and then closing a valve; pressurizing to a set pressure value by a pair of pressure relief sliding blocks of the hydraulic pump; the fluid comprising CO2Or water;
s2, placing the rock sample with the middle hole in a rigid frame of a test bed, applying three-axis confining pressure through a hydraulic pump III, and installing a sound wave emission probe and a sound wave damage measuring probe on the surface of the rock sample through oblique angle drilling of the diagonal angle of a metal gasket;
s3, connecting a connection port of the fluid outlet with a gas pipe II prefabricated in the middle hole, installing a temperature sensor I and a pressure sensor I at the fluid outlet, and connecting a data acquisition instrument and a controller;
s4, connecting a lead on the excitation end part with an exciter, exciting and igniting the energy-gathering agent through the exciter, and heating the fluid;
s5, when the heated pressure of the fluid reaches a set pressure value, the pressure relief sliding block retreats to start pressure relief, and the first temperature sensor and the first pressure sensor start to acquire data;
s6, the rock sample is cracked and damaged under the action of the high-temperature high-pressure supercritical fluid, pressure is applied to the pressure relief slider through the hydraulic pump, the fluid outlet is closed, and meanwhile, the gas circuit connection of the fluid outlet is released;
and S7, after the reaction is finished, driving the waste discharging slide block to move upwards by using the second hydraulic pump, discharging waste residues from the energy collecting agent inlet, discharging the pressure of the second hydraulic pump after the reaction is finished, and returning the waste discharging slide block.
Compared with the prior art, the invention has the following beneficial effects:
the powder reaction kettle can carry out supercritical fluid treatment on the coal rock powder; the true triaxial test bench can perform a supercritical fluid impact test on a coal rock sample under true triaxial and can perform acoustic emission collection and a sound wave velocity loss test. The invention provides coal rock mechanical test equipment and a test method for researching the influence of supercritical fluid on mechanical properties of coal rock in a complex stress state, and provides supercritical CO2And pre-treatment test equipment for soaking coal rock in water to change the microstructure of coal rock and promote the reaction of supercritical fluid (including CO)2And water) to process the research of the change of the macroscopic and microscopic mechanical properties of the coal rock, and provides theoretical support for related engineering practice.
The supercritical fluid generating device can be used repeatedly, can realize automatic pressure relief and automatic gas circuit opening, is convenient for remote operation, and is safe and reliable.
Drawings
FIG. 1 is a schematic view of a supercritical fluid generation apparatus according to the present invention;
FIG. 2 is a schematic view of the inlet seal structure of the present invention;
FIG. 3 is a schematic view of a powder reactor according to the present invention;
FIG. 4 is a schematic structural view of a sealing structure of a sensor according to the present invention;
FIG. 5 is a schematic structural diagram of a true triaxial test stand according to the present invention;
fig. 6 is a schematic structural view of a metal wound gasket of the pressure seal type of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, a supercritical fluid generating device comprises a generating device body 1, wherein the generating device body 1 comprises a shaped agent cabin 16 positioned in the middle and a fluid cabin 12 positioned outside the shaped agent cabin 16;
the fluid chamber 12 is provided with a fluid inlet 11 and a fluid outlet 112;
the fluid outlet 112 comprises a horizontal pipe 114 communicated with the fluid chamber 12, and the middle part of the horizontal pipe 114 is communicated with a vertical pipe 115;
the tail end of the vertical pipe 115 is provided with a connecting port, and the vertical pipe 115 is connected with the warm-pressing acquisition device 110;
the tail end of the horizontal pipe 114 is provided with a first hydraulic oil inlet 113, the first hydraulic oil inlet 113 is connected with a first hydraulic pump 116, and a pressure relief sliding block 111 is arranged in the horizontal pipe 114;
the horizontal pipe 114 comprises an inner diameter small pipe 117 and an inner diameter thick pipe 118 which are integrally connected, the inner diameter small pipe 117 and the inner diameter thick pipe 118 are transited by a first chamfer, the inner diameter small pipe 117 is positioned at one end of the vertical pipe 115 close to the fluid chamber 12, and a second chamfer matched with the first chamfer is arranged on the pressure relief sliding block 111;
the top end of the energy gathering agent cabin 16 is provided with an energy gathering agent inlet 15 and an excitation end part 13; a waste discharge sliding block 17 is arranged in the energy collecting agent cabin 16, and a second hydraulic oil inlet 19 is arranged at the bottom end of the energy collecting agent cabin 16; the second hydraulic oil inlet 19 is connected with the second hydraulic pump 18;
Specifically, the pressure relief slider 111 is provided with a 45-degree chamfer i, and the horizontal pipe 114 is also provided with a 45-degree chamfer i, so that the pressure relief slider 111 and the pipe body are sealed, and the fluid chamber 12 before pressure relief is sealed. And a drill hole is processed on the side wall of the vertical pipe 115 to realize the installation of the temperature and pressure acquisition device 110.
The fluid inlet 11 is used for inputting fluid into the fluid chamber 12; the energy gathering agent inlet 15 is used for inputting energy gathering agents to the energy gathering agent cabin 16; the fluid chamber 12 is used for storing fluid; the shaped agent compartment 16 is used for storing shaped agents; the fluid outlet 112 is used for outputting supercritical fluid; the excitation end 13 is used for exciting the energy gathering agent; the hydraulic pump II 18 and the waste discharge slide block 17 form a hydraulic control waste discharge device for discharging waste residues generated after the energy gathering agent is combusted; the first hydraulic pump 116 and the pressure relief sliding block 111 form a hydraulic control pressure relief device, and supercritical fluid can be automatically released at constant pressure; the temperature sensor and the pressure sensor form a high-precision temperature and pressure acquisition device which can measure the temperature and the pressure of fluid at a pressure relief opening (namely the vertical pipe 115); the valve 14 is used for controlling the opening and closing of the pipeline, and the valve 14 is a needle valve and can withstand higher gas pressure.
The excitation end portion 13 is a boron nitride-coated wire. The boron nitride coated wire has high temperature resistance so that the excitation end 13 can be reused.
The connecting port is an internally threaded tube.
The pressure relief sliding block 111 and the waste discharge sliding block 17 are provided with sealing ring grooves on the outer wall and are provided with sealing rings, so that the separation between cabin bodies is realized.
The inner wall of the energy gathering agent cabin 16 is provided with a groove for ensuring the horizontal movement of the waste discharge sliding block 17. The energy gathering agent cabin 16 is provided with a blocking block used for blocking the waste discharge sliding block 17 and preventing the waste discharge sliding block from damaging the excitation end part 13. The arrangement of the groove, the groove is located in the middle of the inner wall of the energy collecting agent cabin 16, and the waste discharging sliding block 17 can be prevented from damaging the excitation end part 13.
The fluid inlet 11, the energy collecting agent inlet 15, the first hydraulic oil inlet 113 and the second hydraulic oil inlet 19 are sealed by inlet sealing structures;
as shown in fig. 2, the inlet sealing structure includes a pipeline penetrating through a bulkhead or a pipe wall, a bolt groove for installing a bolt 119 is formed in the periphery of the pipeline, a sealing gasket 120 is arranged at the bottom of the bolt groove, the bolt 119 is fixed by a nut 121, through holes adapted to the pipeline are formed in both the bolt 119 and the nut 121, a pipeline 122 penetrates through the pipeline, and the valve 14 is arranged on the pipeline 122; the sealing gasket 120 is a metal wound gasket of a pressure seal type.
As shown in fig. 6, the specific structure of the pressure seal type metal wound gasket is as follows: the center of the compression seal type metal winding gasket is a hole for passing through the pipeline 122, an inner reinforcing ring 1204 is arranged outside the hole, a metal band 1202 is wound outside the inner reinforcing ring 1204, a nonmetal filler 1203 is filled between gaps of the metal band 1202, and an outer reinforcing ring 1201 is arranged outside the metal band 1202; the outer reinforcement ring 1201, the inner reinforcement ring 1204, and the metal band 1202 are all made of 314 stainless steel, and the non-metallic filler 1203 is made of tetrafluoroethylene material.
The compression sealing type metal wound gasket can realize compression sealing and can resist high temperature and high pressure.
Example 2:
as shown in fig. 3, in a coal petrography mechanical test system of a supercritical fluid generation device, the connection port is connected with a powder reaction kettle 2; namely, the supercritical fluid generation device in the embodiment 1 is connected with the powder reaction kettle 2, and the test system is used for the supercritical fluid immersion treatment of the coal rock powder, can observe the change of the micromechanical property of the coal rock powder in a supercritical environment, and provides theoretical support for related engineering practice.
Specifically, the powder reaction kettle 2 comprises a coal rock powder cabin 26, a detachable end part is hermetically arranged at an opening at the top end of the coal rock powder cabin 26, and a stop block 25 for limiting the detachable end part is arranged on the inner wall of the coal rock powder cabin 26;
a first air pipe 27 penetrates through the detachable end part, a screwing thread 22 used for being connected with the connecting port is arranged at the top end of the first air pipe 27, and a plurality of drill holes 28 are arranged at the bottom end of the first air pipe 27;
a second temperature sensor 21 and a second pressure sensor 23 are further arranged on the detachable end part;
the warm-pressure acquisition device 110 comprises a first temperature sensor and a first pressure sensor;
the first temperature sensor, the first pressure sensor, the second temperature sensor 21 and the second pressure sensor 23 are sealed by a sensor sealing structure;
as shown in fig. 4, the sensor sealing structure comprises an air vent 29 slotted on the detachable end part and the vertical pipe 115, and a mounting groove for mounting the probe part 210 of the sensor, wherein the mounting groove is in threaded connection with the probe part 210, the air vent 29 is communicated with the mounting groove, and the top end of the probe part 210 is sleeved with a compression rubber sealing ring 24; the probe portion 210 is connected with a housing portion 211, and the outer diameter of the housing portion 211 is larger than that of the probe portion 210; the vent 29 has a diameter that is the same as the diameter of the inner core of the sensor and smaller than the diameter of the probe section 210; the sensor can be prevented from being rushed out due to overhigh air pressure.
The temperature sensor I, the pressure sensor I, the temperature sensor II 21 and the pressure sensor II 23 are respectively connected with a data acquisition instrument, and the data acquisition instrument is connected with the controller; the excitation end part 13 is connected with the exciter through a lead; the temperature sensor I, the pressure sensor I, the temperature sensor II 21, the pressure sensor II 23, the data acquisition instrument, the controller and the exciter are all powered by a power supply.
The bottom of the first air pipe 27 of the powder reaction kettle 2 is provided with evenly distributed drill holes 28 for fully mixing the coal rock powder and the supercritical fluid.
And the fluid outlet 112 and the air inlet head of the first air pipe 27 of the powder reaction kettle 2 are respectively connected by processing male and female threads.
The powder reactor 2 and the test system in this example were used for supercritical fluid immersion treatment of coal rock powder.
Example 3:
the test method using the coal petrography mechanical test system of embodiment 2 includes the following steps:
s1, inputting the fluid from the fluid inlet 11 into the fluid chamber 12, and then closing the valve 14; inputting the energy-gathering agent into an energy-gathering agent cabin 16 through an energy-gathering agent inlet 15, then closing a valve 14, and pressurizing a pressure relief sliding block 111 to a set pressure value through a first hydraulic pump 116, wherein the set pressure value is 30 MPa; the fluid comprising CO2Or water;
s2, detaching the detachable end part of the powder reaction kettle 2, placing the coal rock powder in the coal rock powder cabin 26, and screwing the detachable end part to finish sealing;
s3, connecting a connecting port of the fluid outlet 112 with a screwing thread 22 on a first air pipe 27 of the powder reaction kettle 2, installing a first temperature sensor and a first pressure sensor at the fluid outlet 112, connecting a data acquisition instrument and a controller, installing a second temperature sensor 21 and a second pressure sensor 23 of the powder reaction kettle 2, and connecting the data acquisition instrument and the controller;
s4, connecting a lead on the excitation end part 13 with an exciter, exciting and igniting the energy-gathering agent through the exciter, and heating the fluid;
s5, when the heated pressure of the fluid reaches the set pressure value of 30 MPa, the pressure relief sliding block 111 retreats to start pressure relief, and the first temperature sensor and the first pressure sensor start to acquire data;
s6, after the temperature and the pressure of the coal rock powder reach a preset value, applying pressure to the pressure relief sliding block 111 through the first hydraulic pump 116 to close the fluid outlet 112, and after the coal rock reaction time reaches a set value, removing the gas circuit connection of the fluid outlet 112 to obtain the reacted coal rock powder;
and S7, after the reaction is finished, driving the waste discharging slide block 17 to move upwards by using the second hydraulic pump 18, discharging waste residues from the energy collecting agent inlet 15, releasing the pressure of the second hydraulic pump 18 after the reaction is finished, and returning the waste discharging slide block 17.
In this embodiment S6, after the coal-rock reaction time reaches the set value, the screw thread at the gas path connection is loosened by a small amount, and after the pressure returns to the atmospheric pressure value, the gas path connection at the gas outlet (i.e., the fluid outlet 112) is released, so as to obtain the reacted coal-rock powder.
Example 4:
as shown in fig. 5, in the coal rock mechanical test system of the supercritical fluid generation device, the connection port is connected with the true triaxial test bed 3 and is used for completing a coal rock true triaxial supercritical fluid cracking experiment; namely, the supercritical fluid generating device in embodiment 1 is connected with a true triaxial test bed 3, the test system is a coal rock mechanical test device for researching the mechanical property influence of the supercritical fluid on coal rock in a complex stress state, and the test system is used for a rock test of supercritical fluid induced fracture under triaxial confining pressure, promotes the research on the macroscopic mechanical property change of coal rock processed by the supercritical fluid, and provides theoretical support for related engineering practice.
Specifically, the true triaxial test bed 3 comprises a test bed rigid frame for placing a rock sample, wherein a middle hole is processed on the rock sample, and a second air pipe is prefabricated in the middle hole;
the rock sample is subjected to triaxial confining pressure through a hydraulic pump III 31, and the end of a hydraulic rod 32 of the hydraulic pump III 31 is provided with a metal gasket 33 which is used for being in contact with the surface of the rock sample;
oblique angle drill holes 35 are formed in opposite corners of the metal gasket 33, and a sound wave transmitting probe and a sound wave damage measuring probe penetrate through the oblique angle drill holes 35;
a breather pipe drilling hole 34 is formed in one of the pressing blocks opposite to the hydraulic pump III 31, and the air pipe II penetrates through the breather pipe drilling hole 34 and is connected with the connecting port;
the warm-pressure acquisition device 110 comprises a first temperature sensor and a first pressure sensor;
the temperature sensor I, the pressure sensor I, the sound wave emission probe and the sound wave damage measuring probe are respectively connected with a data acquisition instrument, and the data acquisition instrument is connected with the controller; the excitation end part 13 is connected with the exciter through a lead; the temperature sensor I, the pressure sensor I, the sound wave emission probe, the sound wave damage measuring probe, the data acquisition instrument, the controller and the exciter are all powered by a power supply.
In this embodiment, the metal shim 33 is provided with 4 holes with a diameter of 20mm at the bevel angle for mounting the acoustic emission probe and the acoustic damage probe. The material of the metal pad 33 is preferably copper or copper-nickel alloy.
This example obtained a reacted rock sample.
Example 5:
the test method using the coal petrography mechanical test system of embodiment 4 includes the following steps:
s1, inputting the fluid from the fluid inlet 11 into the fluid chamber 12, and then closing the valve 14; the energy gathering agent is input into an energy gathering agent cabin 16 through an energy gathering agent inlet 15, and then a valve 14 is closed; pressurizing the pressure relief slide block 111 to a set pressure value such as 40 MPa through a first hydraulic pump 116; the fluid comprising CO2Or water;
s2, placing the rock sample with the middle hole in a rigid frame of a test bed, applying triaxial confining pressure through a hydraulic pump III 31, and installing a sound wave emission probe and a sound wave damage measurement probe on the surface of the rock sample through an oblique angle drilling hole 35 at the opposite angle of a metal gasket 33;
s3, connecting a connecting port of the fluid outlet 112 with a gas pipe II prefabricated in a middle hole, installing a temperature sensor I and a pressure sensor I at the fluid outlet 112, and connecting a data acquisition instrument and a controller;
s4, connecting a lead on the excitation end part 13 with an exciter, exciting and igniting the energy-gathering agent through the exciter, and heating the fluid;
s5, when the heated pressure of the fluid reaches the set pressure value of 40 MPa, the pressure relief sliding block 111 retreats to start pressure relief, and the first temperature sensor and the first pressure sensor start to acquire data;
s6, the rock sample is cracked and damaged under the action of the high-temperature high-pressure supercritical fluid, pressure is applied to the pressure relief sliding block 111 through the first hydraulic pump 116, the fluid outlet 112 is closed, and meanwhile, the gas circuit connection of the fluid outlet 112 is released;
and S7, after the reaction is finished, driving the waste discharging slide block 17 to move upwards by using the second hydraulic pump 18, discharging waste residues from the energy collecting agent inlet 15, releasing the pressure of the second hydraulic pump 18 after the reaction is finished, and returning the waste discharging slide block 17.
In this embodiment S6, when the connection port of the fluid outlet 112 is disconnected from the screw-threaded portion 22 of the first air pipe 27 of the powder reaction vessel 2, the rock sample is broken and the gas leaks out along the cracks, so that there is no fear of gas rushing out.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
As used herein, unless otherwise specified the use of the ordinal adjectives "first", "second", "third", etc., to describe a common object, merely indicate that different instances of like objects are being referred to, and are not intended to imply that the objects so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The present invention has been disclosed in an illustrative rather than a restrictive sense, and the scope of the present invention is defined by the appended claims.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
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| FR3031515A1 (en) * | 2015-01-13 | 2016-07-15 | Nicolas Gilbert Ugolin | METHOD FOR STORING AND GENERATING ENERGY BY REDUCTION AND OXIDATION OF ALUMINUM PARTICLES |
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| CN106837330A (en) * | 2017-03-22 | 2017-06-13 | 辽宁工程技术大学 | A kind of supercritical CO2Improve the device of coal seam permeability |
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