CN114544703A - Device and method for measuring temperature rise characteristics of pressurized coal under multi-atmospheric environment load - Google Patents

Abstract

The invention relates to a device for measuring the oxidation and heating characteristics of pressurized coal under multiple atmospheric environment loads, comprising a bearing base, a coal sample detection chamber, a coal sample measurement tank, a gas source adjustment system, a gas preheater, and a gas chromatographic analyzer. The upper end face of the base is connected with the coal sample detection chamber, the coal sample measurement tank is embedded in the coal sample detection chamber, the coal sample measurement tank is communicated with the gas preheater and the gas chromatograph analyzer, and the gas preheater is also connected with the gas source adjustment system Connected. The specific detection method includes two steps of equipment presetting and detection operation. On the one hand, the invention has a high degree of integration and operation automation, is simple and flexible in operation, can effectively improve the work efficiency of the detection operation of the oxidation temperature rise characteristic of coal samples, and reduce labor intensity; The flexible adjustment of the composition of the coal sample greatly improves the flexibility and versatility of the detection of coal sample characteristics and the authenticity of the simulation of the detection environment.

Description

Device and method for measuring temperature rise characteristics of pressurized coal under multi-atmospheric environment load

technical field

The invention relates to a coal sample characteristic detection device, in particular to a multi-atmospheric environment load pressurized coal body oxidation heating characteristic measurement device and a detection method.

Background technique

my country is rich in coal resources and has become the largest coal producer in the world today, with coal output accounting for more than 35% of the world's total coal output. Coal is not only my country's basic energy, but also my country's main energy and important industrial raw materials. However, in the mining process, mine fires, especially coal spontaneous combustion in coal mines, seriously restrict the normal mining of coal resources.

Coal spontaneous combustion accidents are mainly caused by a series of oxidative spontaneous combustion reactions that occur when coal is in contact with oxygen. However, in the actual coal mining process, there is not only oxygen generated by air leakage underground, but also a series of gas such as gas. The multi-component gas mixture changes the thermal storage status of coal samples in coal mines and affects the spontaneous combustion process of coal. In addition, with the gradual depletion of shallow coal resources, coal mining continues to deepen to the deep, and transfers to the deep at a speed of about 10-25m per year. Influence mechanism of series in-situ stress on spontaneous combustion of coal in multi-element atmosphere. The existing coal spontaneous combustion measurement methods have the following problems: 1. The combustion characteristics of coal samples are only limited to dry air or oxygen flow, and the competitive adsorption phenomenon of coal samples in the presence of multi-element gases in the well is not fully considered. The situation is not very simulated. 2. The simple and traditional axial compression cannot effectively avoid the pressure retention during the combustion of the coal sample, and the error is large under human control. 3. Real-time monitoring and early warning was not carried out for the gas transmission and gas production in the axial compression experiment, which increased the risk factor of the experiment.

Therefore, in view of this situation, it is urgent to develop a new device and method for measuring the oxidation temperature rise characteristics of pressurized coal under multi-atmospheric environment load to meet the needs of practical use.

SUMMARY OF THE INVENTION

Aiming at the deficiencies in the prior art, the present invention provides a device and method for measuring the oxidation temperature rise characteristics of a pressurized coal body under a multi-atmosphere environment load, so as to overcome the above defects and meet the needs of actual detection operations.

In order to achieve the above object, the present invention is realized through the following technical solutions:

A device for measuring the oxidation and heating characteristics of pressurized coal under multiple atmospheric environment loads, comprising a bearing base, a coal sample detection chamber, a coal sample measurement tank, a gas source adjustment system, a gas preheater, a gas chromatographic analyzer, a data acquisition computer, and a The drive circuit, in which the bearing base is a frame structure whose axis is vertically distributed with the horizontal plane, the upper end face of which is connected to the coal sample detection chamber and is coaxially distributed, and the coal sample detection chamber is a closed cavity structure with a rectangular axial section. The tank is embedded in the coal sample detection chamber and distributed coaxially with the coal sample detection chamber. The coal sample detection tank is provided with an air inlet on the lower end face and an exhaust port on the upper end face, wherein the air inlet is connected to the gas preheater through the guide pipe. The exhaust port is connected with the gas chromatograph analyzer through the guide pipe, and the gas preheater is connected with the gas source adjustment system through the guide pipe. The drive circuit is respectively connected with the coal sample detection chamber, the coal sample measurement tank and the gas source adjustment system , Gas preheater, gas chromatographic analyzer, and data acquisition computer are electrically connected, and the data acquisition computer is also electrically connected to the coal sample detection chamber, coal sample measurement tank, gas source adjustment system, gas preheater, and gas chromatography analyzer. Establish a data connection.

Further, the coal sample measurement tank includes a sealing cover, a bearing cavity, a bearing piston, a bearing pressure plate, a driving hydraulic cylinder, a guide column, a driving hydraulic station, a hydraulic stabilizer, a pressure sensor, an air pressure sensor, a temperature sensor, and a temperature strain gauge. , pressure strain gauge, the bearing cavity is a cylindrical hollow tubular structure, the upper end surface and the lower end surface of which are connected with a sealing cover to form a closed cavity structure, and the sealing cover on the lower end surface of the bearing cavity is provided with an air inlet and an adjustment The sealing cover on the upper end face of the bearing cavity is provided with an exhaust port and a wire hole. The bearing piston is embedded in the bearing cavity, distributed coaxially with the bearing cavity and slidably connected with the side wall of the bearing cavity. The bearing cavity is divided into a coal sample detection cavity and an air pressure adjustment cavity from top to bottom, the carrying piston is provided with at least one air guide hole distributed parallel to the axis of the bearing piston, and the coal sample detection cavity and the air pressure adjustment cavity are arranged between the coal sample detection cavity and the air pressure adjustment cavity. Connected through the air guide holes, the lower end surface of the bearing piston is connected with the guide column and distributed coaxially. The lower end surface of the guide column is located outside the bearing cavity through the adjustment port, and is connected to the driving hydraulic cylinder and is coaxially distributed. The driving hydraulic cylinder passes through The hydraulic stabilizer is communicated with the driving hydraulic station and connected with the bottom of the coal sample detection chamber. The bearing pressure plate is embedded in the bearing chamber and connected with the sealing cover on the upper end face of the bearing chamber through a spring. The bearing pressure plate is the same as the bearing chamber. A circular plate-like structure with an axial distribution, slidingly connected with the inner side of the bearing cavity, and several through holes are evenly distributed on the bearing pressure plate. The temperature strain gauge and the pressure strain gauge are both embedded in the coal sample detection cavity and detected with the coal sample. The cavity is coaxially distributed, and the coal sample detection cavity is electrically connected with the data acquisition computer and the drive circuit through wires, and the wires are embedded in the wire holes, and a pressure sensor is provided on the upper end face of the bearing piston and the lower end face of the bearing pressure plate and temperature sensor, and the pressure sensor and temperature sensor are evenly distributed around the axis of the bearing cavity. There are two air pressure sensors in total, which are respectively connected with the connection position of the air inlet and the exhaust port and the guide pipe. The driving hydraulic station, the hydraulic stability The device, pressure sensor, air pressure sensor, and temperature sensor are all electrically connected to the drive circuit, and the pressure sensor, air pressure sensor, and temperature sensor are also electrically connected to the data acquisition computer to establish a data connection.

Further, the bearing piston includes a piston block, a bearing tray, a disc spring, a return spring, and a tension sensor, wherein the piston block is a columnar cavity structure with an axial cross-section of a "冂" shape, and an upper end face thereof is provided with another one. It is coaxially distributed and has a diameter of 80%-90% of the diameter of the piston block. The lower end of the piston block is wrapped outside the guide column and distributed coaxially with the guide column. The bearing tray is distributed coaxially with the piston block. And the axial cross-section is a groove-shaped structure in the shape of "凵", the lower end surface and the side surface of the bearing tray are all grid plate structures, and the lower end surface of the bearing tray is connected with the upper end surface of the piston block through a disc spring, the disc type. At least one spring is embedded in the adjustment cavity, and the distance between the piston block and the bearing tray is 0-10 mm, and there are at least two reset springs, which are distributed parallel to the axis of the piston block and evenly distributed around the axis of the piston block. The upper end surface of the spring is connected with the lower end surface of the piston block, and the lower end is connected with the sealing cover through a tension sensor, the tension sensors are connected in parallel, and are respectively electrically connected with the data acquisition computer and the driving circuit.

Further, the air guide hole is an isosceles trapezoid structure in axial section, and the inner diameter of the upper end face is 3%-10% of the inner diameter of the lower end face, and is not greater than 2 mm, and the upper end of the air guide hole is located at the bottom of the adjustment cavity groove, And the upper end face of the adjustment cavity corresponding to the air guide hole is provided with a filter screen coaxially distributed with the adjustment cavity.

Further, the outer surface of the bearing cavity is provided with at least one electric heating wire distributed around the axis of the bearing cavity in a helical structure, and a number of heat exchange plates that are evenly distributed around the axis of the bearing cavity and have a rectangular plate-like structure in cross section, and wherein The at least two heat exchange plates are slidably connected to the inner side surface of the coal sample detection chamber through sliding rails, and the electric heating wire is also electrically connected to the drive circuit.

Further, the coal sample detection chamber includes a reaction kettle, a gland, an electric heating mechanism, a thermal insulation layer, a sealing protection layer, a guide rail, a bracket, and an adjustment telescopic column, and the reaction kettle is a hollow with a rectangular axial section. Tubular structure, the upper end surface and the lower end surface of which are connected with a gland and form a closed cavity structure with the gland, wherein the upper end surface of the reaction kettle is connected to the gland and is provided with a diversion port, and the lower end surface of the gland is provided with a coal sample measuring tank The guide holes are coaxially distributed, and the guide holes are wrapped outside the driving hydraulic cylinder of the coal sample measuring tank and are distributed coaxially with the driving hydraulic cylinder, and at least two electric heating mechanisms are connected to the inner surface of the reaction kettle, and It is distributed from top to bottom along the axis of the reaction kettle, and the electric heating mechanisms are connected in parallel with each other and electrically connected to the drive circuit. At least two adjustment telescopic columns are connected to the bottom gland of the reactor, and each adjustment telescopic column is evenly distributed around the axis of the reactor and is electrically connected with the drive circuit. External surface connection.

Further, the air source adjustment system includes a dry air high-pressure air cylinder, a methane high-pressure cylinder, a pressure reducing valve, a steady flow valve, a gas distribution instrument, a flow controller, a gas concentration detection alarm, a back pressure valve, a smoke adsorption device, A three-phase switch and an exhaust pipe, wherein the dry air high-pressure air cylinder and the methane high-pressure cylinder are at least one and are connected in parallel with each other, and the air high-pressure air cylinder and the methane high-pressure cylinder are respectively communicated with the air duct through a pressure reducing valve. The air conduit is also communicated with the gas distribution instrument through the steady flow valve, the gas distribution instrument is communicated with the gas preheater through the air conduit, and a flow controller and a Gas concentration detection alarm; in addition, the gas concentration detection alarm, smoke adsorption device, back pressure valve, flow controller and three-phase switch are respectively set on the guide pipe connected between the gas chromatograph analyzer and the coal sample measurement tank, and the gas The concentration detection alarm, the smoke adsorption device, the back pressure valve, the flow controller and the three-phase switch are connected in series through the diversion pipe and distributed along the direction from the coal sample measuring tank to the gas chromatograph analyzer. The three-phase switch is connected to another The exhaust pipe is connected, and the exhaust pipe is respectively connected with the guide pipe and the gas chromatographic analyzer through the three-phase switch, the pressure reducing valve, the steady flow valve, the gas distribution instrument, the flow controller, the gas concentration detection alarm , back pressure valve, smoke adsorption device, and three-phase switch are all connected in parallel with each other, and are electrically connected to the driving circuit respectively.

Further, the data acquisition computer is any one of an industrial computer and a PC computer, and the data acquisition computer is additionally provided with an I/O input and output control device; the drive circuit is a circuit based on a programmable controller. The system, and the drive circuit is additionally provided with a serial port communication module and a control interface based on the display, signal lights and buttons, and the drive circuit also establishes a data connection with the data acquisition computer as an industrial computer through the serial port communication module.

A detection method for a device for measuring the oxidation temperature rise characteristic of a pressurized coal body under a multi-element atmosphere environment load, comprising the following steps:

S1, equipment preset, firstly assemble the bearing base, coal sample detection chamber, coal sample measurement tank, gas source adjustment system, gas preheater, gas chromatography analyzer, data acquisition computer and drive circuit to obtain a finished product detection device , and then independently drive the dry air high-pressure air cylinder of the air source adjustment system to run, carry out the pressure-holding and air-tightness detection of the detection device, and reserve it after the detection is completed;

S2, testing operation, after completing the air tightness test, first add the coal sample into the coal sample measuring tank, and the coal sample is matched with the bearing cavity, bearing piston, bearing pressure plate, driving hydraulic cylinder and guide column of the coal sample measuring tank. Apply the axial pressure that meets the measurement needs, and then configure the gas source adjustment system to obtain the mixed gas with the specified gas content according to the needs of use. After adjusting the pressure and flow of the mixed gas, the gas preheater is preheated to the specified temperature, and finally the temperature is increased. The mixed gas is sent to the coal sample measurement tank in the coal sample detection chamber, and the gas passing through the coal sample is discharged from the top of the coal sample measurement tank and sent to the gas chromatograph for analysis while keeping the coal sample pressure constant. The gas release index of the sample is measured by a gas chromatographic analyzer; on the other hand, the temperature characteristics of the computer are measured, and the measurement parameters of the coal body oxidation heating characteristics can be obtained.

On the one hand, the present invention has high degree of integration and operation automation, simple and flexible operation, and can complete all test parameter setting, test parameter acquisition, test state adjustment and auxiliary coal sample loading and unloading operations through the data acquisition computer and driving circuit, thereby Effectively improve the work efficiency of coal sample oxidation and heating characteristic detection operation, reduce labor intensity; The measuring tank adjusts the detection temperature environment, and adjusts the axial pressure of the coal sample in the detection operation through the coal sample measuring tank, which effectively meets the needs of coal sample detection under different environmental conditions, and greatly improves the detection flexibility and universality of coal sample characteristics. Therefore, it can effectively improve the detection accuracy of coal sample characteristics and the versatility of detection equipment.

Description of drawings

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

1 is a schematic structural diagram when the present invention adopts a distributed structure;

Figure 2 is a schematic diagram of the connection structure of the coal sample detection chamber and the coal sample measurement tank;

Fig. 3 is the structural intention of bearing piston;

Figure 4 is a flow chart of the method of the present invention.

Detailed ways

In order to make the technical means, creative features, achievement goals and effects realized by the present invention easy to understand, the present invention will be further described below with reference to the specific embodiments.

As shown in Figures 1-3, a device for measuring the oxidation and heating characteristics of coal under pressure in a multi-atmosphere environment includes a bearing base 1, a coal sample detection chamber 2, a coal sample measurement tank 3, a gas source adjustment system 4, and a gas pre-conditioning system. Heater 5, gas chromatographic analyzer 6, data acquisition computer 7 and drive circuit 8, wherein the bearing base 1 is a frame structure whose axis is vertically distributed with the horizontal plane, and its upper end face is connected with the coal sample detection chamber 2 and distributed coaxially. The sample detection chamber 2 is a closed cavity structure with a rectangular axial section. The coal sample measurement tank 3 is embedded in the coal sample detection chamber 2 and distributed coaxially with the coal sample detection chamber 2. The lower end face of the coal sample measurement tank 3 is provided with an air inlet. Port 101, an exhaust port 102 is provided on the upper end face, wherein the air inlet 101 is communicated with the gas preheater 5 through the guide pipe 9, and the exhaust port 102 is communicated with the gas chromatograph analyzer 6 through the guide pipe 9, and the gas is preheated. The device 5 is also communicated with the gas source adjustment system 4 through the guide pipe 9, and the drive circuit 8 is respectively connected with the coal sample detection chamber 2, the coal sample measurement tank 3, the gas source adjustment system 4, the gas preheater 5, and the gas chromatograph analyzer 6. , The data acquisition computer 7 is electrically connected, and the data acquisition computer 7 is also electrically connected with the coal sample detection chamber 2, the coal sample measurement tank 3, the gas source adjustment system 4, the gas preheater 5, and the gas chromatograph analyzer 6 and establishes a data connection. .

In this embodiment, the gas source adjustment system 4 , the gas preheater 5 , the gas chromatography analyzer 6 , the data acquisition computer 7 , the drive circuit 8 and the bearing base 1 are arranged in a distributed structure and an integrated structure. in:

When the distributed structure is adopted, the gas source adjustment system 4, the gas preheater 5, the gas chromatography analyzer 6, the data acquisition computer 7 and the driving circuit 8 are respectively installed on the same external installation infrastructure as the bearing base 1 through auxiliary mechanisms. superior;

When the integrated structure is adopted, the gas source adjustment system 4 , the gas preheater 5 , the gas chromatography analyzer 6 , the data acquisition computer 7 and the drive circuit 8 are all embedded in the outer surface of the bearing base 1 .

In this embodiment, the coal sample measuring tank 3 includes a sealing cover 31, a bearing cavity 32, a bearing piston 33, a bearing pressure plate 34, a driving hydraulic cylinder 35, a guide column 36, a driving hydraulic station 37, a hydraulic stabilizer 38, a pressure The sensor 39 , the air pressure sensor 310 , the temperature sensor 311 , the temperature strain gauge 312 , and the pressure strain gauge 313 . The bearing cavity 32 is a cylindrical hollow tubular structure whose upper and lower end faces are connected to the sealing cover 31 to form a closed cavity structure , the sealing cover 31 on the lower end face of the bearing cavity 32 is provided with an air inlet 101 and an adjustment port 103, the sealing cover on the upper end face of the bearing cavity 32 is provided with an exhaust port 102 and a wire hole 104, the bearing piston 33 is embedded in the bearing cavity 32, distributed coaxially with the bearing cavity 32 and slidably connected with the side wall of the bearing cavity 32. The bearing piston 33 divides the bearing cavity 32 into a coal sample detection cavity 301 and an air pressure adjustment cavity from top to bottom. The bearing piston 33 is provided with at least one air guide hole 303 distributed parallel to the axis of the bearing piston 33, and the coal sample detection chamber 301 and the air pressure adjustment chamber 302 are communicated through the air guide hole 303, and the bearing piston 33 lowers The end face is connected to the guide column 36 and distributed coaxially. The lower end face of the guide column 36 is located outside the bearing cavity 32 through the adjustment port 103 , and is connected to the driving hydraulic cylinder 35 and distributed coaxially. The driving hydraulic cylinder 35 passes through the hydraulic stabilizer 38 It communicates with the driving hydraulic station 37 and is connected to the bottom of the coal sample detection chamber 2. The bearing pressure plate 34 is embedded in the bearing chamber 32 and connected with the sealing cover 31 on the upper end of the bearing chamber 32 through the spring 10. The bearing pressure plate 34 It is a circular plate-like structure coaxially distributed with the bearing cavity 32 , and is slidably connected to the inner side of the bearing cavity 32 , and a plurality of through holes 11 are evenly distributed on the bearing pressure plate 34 . Inside the coal sample detection chamber 301 and coaxially distributed with the coal sample detection chamber 301, and the coal sample detection chamber 301 is electrically connected to the data acquisition computer 7 and the drive circuit 8 through the wire 12, and the wire 12 is embedded in the wire In the hole 104, a pressure sensor 39 and a temperature sensor 311 are provided on the upper end surface of the bearing piston 33 and the lower end surface of the bearing pressure plate 34, and the pressure sensor 39 and the temperature sensor 311 are evenly distributed around the axis of the bearing cavity 32, and the air pressure sensors 310 are in total. Two are connected to the connection positions of the intake port 101 and the exhaust port 102 and the guide pipe 9 respectively. The driving hydraulic station 37, the hydraulic stabilizer 38, the pressure sensor 39, the air pressure sensor 310, and the temperature sensor 311 are all connected with the driving circuit. 8 is electrically connected, and the pressure sensor 39, the air pressure sensor 310, and the temperature sensor 311 are also electrically connected to the data acquisition computer 7 and establish a data connection.

It should be noted that the bearing piston 33 includes a piston block 331, a bearing tray 332, a disc spring 333, a return spring 334, and a tension sensor 335, wherein the piston block 331 is a cylindrical cavity with an axial cross-section in the shape of "冂". body structure, the upper end face is provided with another adjustment cavity 336 coaxially distributed with it, and the diameter is 80%-90% of the diameter of the piston block 331, the lower end of the piston block 331 is wrapped outside the guide column 36 and is the same as the guide column 36 Shaft distribution, the bearing tray 332 is a groove-like structure with a coaxial distribution with the piston block 331 and an axial cross-section in the shape of a "凵" shape, the lower end surface and the side surface of the bearing tray 332 are grid plate structures, and the bearing tray The lower end surface of 332 is connected to the upper end surface of the piston block 331 through a disc spring 333, at least one of the disc springs 333 is embedded in the adjustment cavity 336, and the distance between the piston block 331 and the bearing tray 332 is 0-10 mm, so There are at least two return springs 334, which are distributed parallel to the axis of the piston block 331 and evenly distributed around the axis of the piston block 331. The upper end surface of the return spring 334 is connected to the lower end surface of the piston block 331, and the lower end is connected to the sealing cover 31 through a tension sensor 335. The tension sensors 335 are connected in parallel, and are electrically connected to the data acquisition computer 7 and the drive circuit 8 respectively.

Further optimized, the air guide hole 303 is an isosceles trapezoid structure in axial section, and the inner diameter of the upper end face is 3%-10% of the inner diameter of the lower end face, and is not greater than 2 mm, and the upper end of the air guide hole 303 is located in the adjustment cavity 336. At the bottom of the groove, and the upper end surface of the adjustment cavity 336 corresponding to the air guide hole 303 is provided with a filter screen 304 coaxially distributed with the adjustment cavity 336 .

In addition, the outer surface of the bearing cavity 32 is provided with at least one electric heating wire 321 distributed around the axis of the bearing cavity 32 in a helical structure, and a number of heat exchange plates are arranged around the axis of the bearing cavity 32 and have a rectangular plate-like structure in cross section. 322 , and at least two of the heat exchange plates 322 are slidably connected to the inner surface of the coal sample detection chamber 2 through the slide rail 13 , and the electric heating wire 321 is also electrically connected to the drive circuit 8 .

Further optimization, another telescopic sensor 13 is provided on the driving hydraulic cylinder 35 , and the telescopic sensor 13 is connected to the outer surface of the driving hydraulic cylinder 35 and is electrically connected to the driving circuit 8 .

In this embodiment, the coal sample detection chamber 2 includes a reaction kettle 21, a gland 22, an electric heating mechanism 23, a thermal insulation layer 24, a sealing protection layer 25, a guide rail 26, a bracket 27, and an adjustment telescopic column 28. The reaction kettle 21 is a hollow tubular structure with a rectangular axial cross-section, the upper end surface and the lower end surface of the reaction kettle 21 are connected with a gland 22 and form a closed cavity structure with the gland 22, wherein the upper end surface of the reaction kettle 21 is connected with the gland 22. A guide port 201 is provided, and the lower end face gland 22 is provided with a guide hole 202 coaxially distributed with the coal sample measurement tank 3, and the guide hole 202 is wrapped outside the driving hydraulic cylinder 35 of the coal sample measurement tank 3 and is connected with the driving hydraulic cylinder 35. The hydraulic cylinders 35 are coaxially distributed, and at least two electric heating mechanisms 23 are connected to the inner surface of the reactor 21 and distributed from top to bottom along the axis of the reactor 21, and the electric heating mechanisms 23 are connected in parallel with each other and drive The circuit 8 is electrically connected, the bracket 27 is an annular frame structure coaxially distributed with the coal sample measurement tank 3, the lower end surface of the bracket 27 is connected to the bottom gland 22 of the reactor 21 through at least two adjustment telescopic columns 28, and Each adjustment telescopic column 28 is evenly distributed around the axis of the reactor 21 and is electrically connected to the driving circuit 8 .

At the same time, the air source adjustment system 4 includes a dry air high-pressure air cylinder 41, a methane high-pressure cylinder 42, a pressure reducing valve 43, a steady flow valve 44, a gas distribution instrument 45, a flow controller 46, and a gas concentration detection alarm 47. , back pressure valve 48, smoke adsorption device 49, three-phase switch 410 and exhaust pipe 411, wherein the dry high-pressure air cylinder 41 and the methane high-pressure cylinder 42 are at least one, and are connected in parallel with each other, the empty high-pressure air cylinder 41 , the methane high-pressure steel cylinder 42 is respectively communicated with the gas pipe 412 through the pressure reducing valve 43, the gas pipe 412 is also communicated with the gas distribution instrument 45 through the steady flow valve 44, and the gas distribution instrument 45 is connected with the gas preheater through the gas pipe 412. 5 is connected, and a flow controller 46 and a gas concentration detection alarm 47 are provided on the duct 412 that the gas distribution instrument 45 communicates with the gas preheater 5; The connected diversion pipes 9 are respectively provided with a gas concentration detection alarm 47, a smoke adsorption device 49, a back pressure valve 48, a flow controller 46 and a three-phase switch 410, and the gas concentration detection alarm 47, the smoke adsorption device 49, the back pressure The pressure valve 48, the flow controller 46 and the three-phase switch 410 are connected in series through the guide pipe 9 and distributed along the direction from the coal sample measuring tank 3 to the gas chromatograph analyzer 6. The three-phase switch 410 is also connected to an exhaust pipe. 411 is connected, and the exhaust pipe 411 is respectively connected with the guide pipe 9 and the gas chromatograph analyzer 6 through the three-phase switch 410, the pressure reducing valve 43, the steady flow valve 44, the gas distribution instrument 45, the flow controller 46 , the gas concentration detection alarm 47, the back pressure valve 48, the smoke adsorption device 49, and the three-phase switch 410 are all connected in parallel with each other, and are respectively electrically connected with the drive circuit 8. The flow controller 46, the gas concentration detection alarm 47 are also connected with The data acquisition computer 7 is electrically connected and a data connection is established.

In this embodiment, the data acquisition computer 7 is any one of an industrial computer and a PC computer, and the data acquisition computer is additionally provided with an I/O input and output control device; the drive circuit 8 is based on a programmable controller Based on the circuit system, and the drive circuit 8 is additionally provided with a serial port communication module and a control interface based on the display, signal lights and buttons, and the drive circuit also establishes a data connection with the industrial computer 7 through the serial port communication module and the data acquisition computer.

As shown in Figure 4, a detection method of a device for measuring the oxidation temperature rise characteristics of a pressurized coal mass under a multi-element atmosphere environment load includes the following steps:

S1, equipment preset, firstly assemble the bearing base, coal sample detection chamber, coal sample measurement tank, gas source adjustment system, gas preheater, gas chromatography analyzer, data acquisition computer and drive circuit to obtain a finished product detection device , and then independently drive the dry air high-pressure air cylinder of the air source adjustment system to run, carry out the pressure-holding and air-tightness detection of the detection device, and reserve it after the detection is completed;

S2, testing operation, after completing the air tightness test, first add the coal sample into the coal sample measuring tank, and the coal sample is matched with the bearing cavity, bearing piston, bearing pressure plate, driving hydraulic cylinder and guide column of the coal sample measuring tank. Apply the axial pressure that meets the measurement needs, and then configure the gas source adjustment system to obtain the mixed gas with the specified gas content according to the needs of use. After adjusting the pressure and flow of the mixed gas, the gas preheater is preheated to the specified temperature, and finally the temperature is increased. The mixed gas is sent to the coal sample measurement tank in the coal sample detection chamber, and the gas passing through the coal sample is discharged from the top of the coal sample measurement tank and sent to the gas chromatograph for analysis while keeping the coal sample pressure constant. The gas release index of the sample is measured by a gas chromatographic analyzer; on the other hand, the temperature characteristics of the computer are measured, and the measurement parameters of the coal body oxidation heating characteristics can be obtained.

On the one hand, the present invention has high degree of integration and operation automation, simple and flexible operation, and can complete all test parameter setting, test parameter acquisition, test state adjustment and auxiliary coal sample loading and unloading operations through the data acquisition computer and driving circuit, thereby Effectively improve the work efficiency of coal sample oxidation and heating characteristic detection operation, reduce labor intensity; The measuring tank adjusts the detection temperature environment, and adjusts the axial pressure of the coal sample in the detection operation through the coal sample measuring tank, which effectively meets the needs of coal sample detection under different environmental conditions, and greatly improves the detection flexibility and universality of coal sample characteristics. Therefore, it can effectively improve the detection accuracy of coal sample characteristics and the versatility of detection equipment.

Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements can be made to the present invention without departing from the spirit and scope of the present invention. Such variations and modifications fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. The utility model provides a many first atmosphere environmental load pressurized coal body oxidation intensification characteristic survey device which characterized in that: the device for measuring the oxidation and temperature rise characteristics of the pressurized coal body under the multi-atmosphere environment load comprises a bearing base, a coal sample detection cavity, a coal sample measurement tank, a gas source adjusting system, a gas preheater, a gas chromatograph, a data acquisition computer and a driving circuit, wherein the bearing base is of a frame structure with the axis vertically distributed with the horizontal plane, the upper end surface of the bearing base is connected with the coal sample detection cavity and coaxially distributed with the coal sample detection cavity, the coal sample detection cavity is of a closed cavity structure with a rectangular axial cross section, the coal sample measurement tank is embedded in the coal sample detection cavity and coaxially distributed with the coal sample detection cavity, the lower end surface of the coal sample measurement tank is provided with a gas inlet, the upper end surface of the coal sample measurement tank is provided with a gas outlet, the gas inlet is communicated with the gas preheater through a guide pipe, the gas outlet is communicated with the gas chromatograph through the guide pipe, the gas preheater is further communicated with the gas source adjusting system through the guide pipe, and the driving circuit is respectively communicated with the coal sample detection cavity, The coal sample measuring tank, the gas source adjusting system, the gas preheater, the gas chromatography analyzer and the data acquisition computer are electrically connected, and the data acquisition computer is electrically connected with the coal sample detecting cavity, the coal sample measuring tank, the gas source adjusting system, the gas preheater and the gas chromatography analyzer and establishes data connection.

2. The apparatus for measuring the oxidation temperature rise characteristics of a pressurized coal body under a multi-atmosphere environmental load according to claim 1, wherein: the coal sample measuring tank comprises a sealing cover, a bearing cavity, a bearing piston, a bearing pressing plate, a driving hydraulic cylinder, a guide post, a driving hydraulic station, a hydraulic stabilizer, a pressure sensor, an air pressure sensor, a temperature strain gauge and a pressure strain gauge, wherein the upper end surface and the lower end surface of the bearing cavity are of a cylindrical hollow tubular structure and are connected with the sealing cover to form a closed cavity structure, the sealing cover on the lower end surface of the bearing cavity is provided with an air inlet and an adjusting port, the sealing cover on the upper end surface of the bearing cavity is provided with an air outlet and a wire passing hole, the bearing piston is embedded in the bearing cavity and is coaxially distributed with the bearing cavity and is in sliding connection with the side wall of the bearing cavity, the bearing cavity is divided into a coal sample detecting cavity and an air pressure adjusting cavity by the bearing piston from top to bottom, and at least one air guide hole which is distributed in parallel to the axis of the bearing piston is arranged on the bearing piston, the coal sample detection cavity and the air pressure adjusting cavity are communicated through an air guide hole, the lower end face of the bearing piston is connected with and coaxially distributed with the guide column, the lower end face of the guide column is positioned outside the bearing cavity through an adjusting hole and is connected with and coaxially distributed with a driving hydraulic cylinder, the driving hydraulic cylinder is communicated with a driving hydraulic station through a hydraulic stabilizer and is connected with the bottom of the coal sample detection cavity, the bearing pressing plate is embedded in the bearing cavity and is connected with a sealing cover on the upper end face of the bearing cavity through a spring, the bearing pressing plate is of a circular plate-shaped structure coaxially distributed with the bearing cavity, is in sliding connection with the inner side face of the bearing cavity and is uniformly distributed with a plurality of through holes on the bearing pressing plate, the temperature strain gauge and the pressure strain gauge are respectively embedded in the coal sample detection cavity and are coaxially distributed with the coal sample detection cavity, and the coal sample detection cavity is electrically connected with the data acquisition computer and the driving circuit through a lead wire, and the wire inlays in crossing the wire hole, bear the weight of the pressure sensor and temperature sensor all established on piston up end and bear the weight of the clamp plate lower extreme, and pressure sensor and temperature sensor encircle and bear the weight of the chamber axis equipartition, baroceptor totally two, communicate with air inlet and gas vent and honeycomb duct hookup location respectively, drive hydraulic pressure station, hydraulic stabilizer, pressure sensor, baroceptor, temperature sensor all with drive circuit electrical connection, and pressure sensor, baroceptor, temperature sensor in addition with data acquisition computer electrical connection and establish data connection.

3. The apparatus for measuring the oxidation temperature rise characteristics of a pressurized coal body under a multi-atmosphere environmental load according to claim 2, wherein: the bearing piston comprises a piston block, a bearing tray, disc springs, return springs and a tension sensor, wherein the piston block is of a cylindrical cavity structure with an axial section in a shape of Jiong, the upper end face of the piston block is provided with an adjusting cavity which is coaxially distributed with the piston block and has the diameter of 80-90% of the diameter of the piston block, the lower end of the piston block is coated outside the guide column and coaxially distributed with the guide column, the bearing tray is of a groove structure which is coaxially distributed with the piston block and has the axial section in a shape of U, the lower end face and the side surface of the bearing tray are of grid plate structures, the lower end face of the bearing tray is connected with the upper end face of the piston block through the disc springs, at least one disc spring is embedded in the adjusting cavity, the interval between the piston block and the bearing tray is 0-10 mm, at least two return springs are distributed in parallel with the axis of the piston block and uniformly distributed around the axis of the piston block, the upper end face of the reset spring is connected with the lower end face of the piston block, the lower end of the reset spring is connected with the sealing cover through the tension sensors, and the tension sensors are connected in parallel and are respectively and electrically connected with the data acquisition computer and the driving circuit.

4. The apparatus for measuring the oxidation temperature rise characteristics of a pressurized coal body under a multi-atmosphere environmental load according to claim 2, wherein: the air guide hole is of an isosceles trapezoid structure with an axial cross section, the inner diameter of the upper end face of the air guide hole is 3% -10% of the inner diameter of the lower end face of the air guide hole and not larger than 2 mm, the upper end of the air guide hole is located at the bottom of the adjusting cavity, and a filter screen which is coaxially distributed with the adjusting cavity is arranged on the upper end face of the adjusting cavity corresponding to the air guide hole.

5. The apparatus for measuring the oxidation temperature rise characteristics of a pressurized coal body under a multi-atmosphere environmental load according to claim 2, wherein: the outer surface of the bearing cavity is provided with at least one electric heating wire which is distributed in a spiral structure around the axis of the bearing cavity, a plurality of heat exchange plates which are uniformly distributed around the axis of the bearing cavity and have rectangular plate-shaped cross sections are additionally arranged, at least two heat exchange plates are connected with the inner side surface of the coal sample detection cavity in a sliding mode through sliding rails, and the electric heating wire is electrically connected with a driving circuit.

6. The apparatus for measuring the oxidation temperature rise characteristics of a pressurized coal body under a multi-atmosphere environmental load according to claim 1, wherein: the coal sample detection cavity comprises a reaction kettle, a gland, electric heating mechanisms, a heat preservation layer, a sealing protective layer, guide slide rails, a bracket and an adjusting telescopic column, wherein the reaction kettle is of a hollow tubular structure with a rectangular axial section, the upper end surface and the lower end surface of the reaction kettle are both connected with the gland and form a closed cavity structure with the gland, the upper end surface of the reaction kettle is connected with the gland to form a flow guide port, the lower end surface of the reaction kettle is connected with the gland to form a guide hole which is coaxially distributed with the coal sample measuring tank, the guide hole is wrapped outside a driving hydraulic cylinder of the coal sample measuring tank and coaxially distributed with the driving hydraulic cylinder, the electric heating mechanisms are at least two and are connected with the inner surface of the reaction kettle and are distributed from top to bottom along the axial line of the reaction kettle, the electric heating mechanisms are mutually connected in parallel with each other and are electrically connected with a driving circuit, the bracket is of an annular frame structure which is coaxially distributed with the coal sample measuring tank, and the lower end surface of the bracket is connected with the gland at the bottom of the reaction kettle through at least two adjusting telescopic columns, and each adjusting telescopic column is uniformly distributed around the axis of the reaction kettle and is electrically connected with the driving circuit, and the sealing protective layer is coated outside the reaction kettle and is connected with the outer surface of the reaction kettle through a heat insulation layer.

7. The apparatus for measuring the oxidation temperature rise characteristics of a pressurized coal body under a multi-atmosphere environmental load according to claim 1, wherein: the gas source adjusting system comprises a dry high-pressure air steel cylinder, a methane high-pressure steel cylinder, a pressure reducing valve, a flow stabilizing valve, a gas distributor, a flow controller, a gas concentration detection alarm, a back pressure valve, a smoke adsorption device, a three-phase switch and an exhaust pipe, wherein at least one of the dry high-pressure air steel cylinder and the methane high-pressure steel cylinder is connected in parallel, the dry high-pressure air steel cylinder and the methane high-pressure steel cylinder are respectively communicated with a gas guide tube through the pressure reducing valve, the gas guide tube is further communicated with the gas distributor through the flow stabilizing valve, the gas distributor is communicated with a gas preheater through the gas guide tube, and the gas guide tube communicated with the gas preheater of the gas distributor is provided with the flow controller and the gas concentration detection alarm; in addition, a gas concentration detection alarm, a smoke adsorption device, a back pressure valve, a flow controller and a three-phase switch are respectively arranged on a flow guide pipe communicated between the gas chromatographic analyzer and the coal sample measuring tank, and the gas concentration detection alarm, the smoke adsorption device, the backpressure valve, the flow controller and the three-phase switch are connected in series through a guide pipe and distributed along the direction from the coal sample measuring tank to the gas chromatographic analyzer, the three-phase switch is also communicated with an exhaust pipe, the exhaust pipe is respectively communicated with the flow guide pipe and the gas chromatographic analyzer through a three-phase switch, the pressure reducing valve, the flow stabilizing valve, the gas distributor, the flow controller, the gas concentration detection alarm, the backpressure valve, the smoke adsorption device and the three-phase switch are all connected in parallel, and the flow controller and the gas concentration detection alarm are electrically connected with the data acquisition computer and establish data connection.

8. The apparatus for measuring the oxidation temperature rise characteristics of a pressurized coal body under a multi-atmosphere environmental load according to claim 1, wherein: the data acquisition computer is any one of an industrial computer and a PC computer, and is additionally provided with an I/O input/output control device; the driving circuit is a circuit system based on a programmable controller, a serial communication module and an operation interface based on a display, a signal lamp and a key are additionally arranged on the driving circuit, and the driving circuit is additionally connected with the data acquisition computer through the serial communication module to establish data connection for the industrial computer.

9. A detection method of a device for measuring the oxidation temperature rise characteristics of pressurized coal under the multi-atmosphere environmental load is characterized by comprising the following steps: the detection method of the device for measuring the oxidation heating characteristic of the pressurized coal body loaded in the multi-atmosphere environment comprises the following steps:

s1, presetting equipment, namely firstly assembling a bearing base, a coal sample detection cavity, a coal sample measuring tank, a gas source adjusting system, a gas preheater, a gas chromatographic analyzer, a data acquisition computer and a driving circuit to obtain a finished product detection device, then independently driving a dry high-pressure air steel cylinder of the gas source adjusting system to operate, carrying out pressure-maintaining air tightness detection on the detection device, and reserving after the detection is finished;

s2, detecting, after completing the air tightness detection, firstly adding a coal sample into a coal sample measuring tank, applying axial pressure meeting the measuring requirement to the coal sample by matching a bearing cavity, a bearing piston, a bearing pressing plate, a driving hydraulic cylinder and a guide column of the coal sample measuring tank, then configuring mixed gas with specified gas content by a gas source regulating system according to the using requirement, preheating the mixed gas to a specified temperature by a gas preheater after regulating the pressure and the flow rate, finally conveying the heated mixed gas into the coal sample measuring tank of the coal sample detecting cavity, discharging the gas passing through the coal sample from the top of the coal sample measuring tank and conveying the gas to a gas chromatograph for analysis under the condition of keeping the pressure of the coal sample constant, and on the one hand, measuring the gas release index of the sample by the gas chromatograph; on the other hand, the computer measures the temperature characteristic, and then the measured parameters of the coal body oxidation temperature rise characteristic can be obtained.

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