阅读说明：本技术 一种不同尺度煤火灾害热动力过程模拟测试装置及方法 (Different-scale coal fire disaster thermal power process simulation test device and method ) 是由 肖旸 张�浩 任帅京 李青蔚 邓军 芦星 翟小伟 于 2019-09-28 设计创作，主要内容包括：本发明公开了一种不同尺度煤火灾害热动力过程模拟测试装置及方法,测试装置包括物理相似模拟试验台、透明隔热罩、无线自组网测温系统、粒子辐射监测应力状态系统以及气体监测系统,测试方法步骤包括设计实验煤田火灾本演化所需条件、搭建物理相似模拟试验台、引燃煤层、通过传感器检测数据进行分析；本发明能模拟采空区垮落过程,而且能够模拟煤田火灾演化过程,同时能够实现不同条件的煤田火灾和矿井采空区的演化过程,通过无线自组网测温系统、粒子辐射监测应力状态系统、气体监测系统能够实现对煤田火灾和矿井采空区演化过程中温度场的分布、煤岩裂隙的分布及发育规律、煤岩裂隙供风通道的变化规律的实时监测。(The invention discloses a device and a method for simulating and testing the thermodynamic process of coal fire disasters with different scales, wherein the testing device comprises a physical similarity simulation test bed, a transparent heat insulation cover, a wireless ad hoc network temperature measurement system, a particle radiation monitoring stress state system and a gas monitoring system; the invention can simulate the caving process of the goaf, simulate the coal field fire evolution process, realize the coal field fire and the mine goaf evolution process under different conditions, and realize the real-time monitoring of the distribution of the temperature field, the distribution and development rule of the coal rock cracks and the change rule of the coal rock crack air supply channel in the coal field fire and the mine goaf evolution process through the wireless ad hoc network temperature measuring system, the particle radiation stress monitoring state system and the gas monitoring system.)

1. The utility model provides a different yardstick coal fire disaster thermodynamic process simulation testing arrangement, includes physics analog simulation test bench (1), transparent heat exchanger (2), wireless ad hoc network temperature measurement system, particle radiation monitoring stress state system and gas monitoring system, its characterized in that:

the physical similarity simulation test bed comprises a test bed base (6), a detachable channel steel (7), a lower bottom plate (8) and an auxiliary plate (26); the lower bottom plate (8) is fixedly arranged on the upper surface of the test bed base (6), a plurality of screw holes with the same size and equal intervals are arranged on the lower bottom plate (8) and the detachable channel steel (7), the detachable channel steel (7) is fixedly arranged on the upper side, the lower side, the left side and the right side of the lower bottom plate (8) through bolts and screw holes, the auxiliary plate (26) is detachably and slidably connected with the left side of the lower bottom plate (8) through a bearing, and an adjustable inclination angle is formed between the auxiliary plate (26) and the surface of the lower bottom plate (8);

the transparent heat insulation cover (2) is covered on the physical similarity simulation test bed (1), the transparent heat insulation cover (2) comprises an upper top plate (9), a left side plate (10), a right side plate (11), a rear panel (12), a front panel (13) and a smoke exhaust device (27), the upper top plate (9), the left side plate (10), the right side plate (11) and the rear panel (12) are of an integrated structure, and the front panel (13) is connected with the left side plate (10) and the right side plate (11) in an up-down pull type manner; the smoke exhaust device (27) is fixedly arranged on the inner wall above the right side of the rear panel (12);

the wireless ad-hoc network temperature measuring system comprises an oxygen supply device (14), an air compressor (15), a heating device (16), a wireless transmission module (17), thermocouples (18) and a thermocouple analog-to-digital converter (19), wherein the outlet end of the oxygen supply device (14) is connected with the inlet end of the air compressor (15), the thermocouples (18), the thermocouple analog-to-digital converter (19) and the wireless transmission module (17) comprise a plurality of thermocouples, a thermocouple analog-to-digital converter and a wireless transmission module, each thermocouple is connected with one thermocouple analog-to-digital converter, each thermocouple analog-to-digital converter is connected with one wireless transmission module, and each wireless transmission module is in communication connection with a gateway in an ad-hoc network mode, is accessed into an Internet network and is in communication connection with a computer (20;

the particle radiation stress state monitoring system comprises a rod-shaped stress sensor (21), a power signal line (22) and a stress detector (23), wherein the rod-shaped stress sensor (21) is arranged in a screw hole in a detachable channel steel (7), and the rod-shaped stress sensor (21) is electrically connected with the stress monitor (23) through the power signal line (22);

the gas monitoring system comprises a gas sensor (24) and a gas monitor (25), wherein the gas sensor and the gas monitor are electrically connected through a signal line.

2. The device for simulating and testing the thermodynamic processes of coal fire disasters with different dimensions according to claim 1, wherein the size of the test bed base (6) is 1800mm x 1200mm x 100mm, the size of the detachable channel steel (7) is 1400mm x 120mm x 50mm or 700mm x 120mm x 50mm, the size of the auxiliary plate is 800mm x 700mm, the size of the lower base plate is 1600mm x 1400mm, and the distance between two adjacent screw holes on the detachable channel steel (7) and the lower base plate (8) is 100 mm.

3. The different-scale coal fire disaster thermodynamic process simulation test device according to claim 1, wherein the dimensions of the upper top plate (9), the left side plate (10), the right side plate (11), the rear panel (12) and the front panel (13) are 2200mm x 1600mm, and the upper top plate (9), the left side plate (10), the right side plate (11), the rear panel (12) and the front panel (13) are made of transparent high temperature resistant materials.

4. The thermodynamic process simulation test device for coal fire disasters with different dimensions according to claim 1, wherein the physical similarity simulation test bed (1) can be adjusted in length, width and height by increasing or decreasing the number of detachable channel steels (7).

5. The different-scale coal fire disaster thermodynamic process simulation testing device according to claim 1, wherein the gas monitor (25) and the stress detector (23) are electrically connected with the computer (20) through data lines.

6. The different-scale coal fire disaster thermodynamic process simulation test device according to claim 1, wherein the auxiliary plate (26) forms an adjustable inclination angle with the surface of the lower base plate (8) in a range of 0-90 °.

7. A thermal power process simulation test method for coal fire disasters with different scales is characterized by comprising the following steps:

s1, designing conditions required by fire of the experimental coal field or mine goaf evolution;

s2, selecting the number and the specification of detachable channel steel according to design conditions, building a physical similarity simulation test bed model frame, and adjusting an auxiliary plate to select a corresponding inclination angle to arrange the required coal rock layer; meanwhile, thermocouples are arranged in the coal rock layer at an adjacent distance of 100 mm;

s3, standing the built physical analog simulation test bed model, and waiting for solidification and forming; meanwhile, other components are connected according to requirements;

s4, heating the experimental coal seam through the oxygen supply device and the heating device, igniting the coal seam, and timely inserting the gas sensor into the air supply channel when the coal seam collapses to generate cracks to form the air supply channel;

and S5, monitoring the evolution process through the thermocouple, the rod-shaped stress sensor and the gas sensor, and analyzing the detection data through the thermocouple, the rod-shaped stress sensor and the gas sensor.

Technical Field

The invention relates to the field of coal field fire and coal mine goaf evolution process simulation tests, in particular to a coal fire disaster thermal power process simulation test device and method with different scales.

Background

Spontaneous combustion of coal is one of main disasters threatening safety production of coal, while the fire area of the coal field in China is wide in distribution range and serious in fire degree, wherein the fire of the coal field in the north is the most serious; it is estimated that China loses about 2000 million tons of coal resources directly and up to 2 hundred million tons indirectly each year. Coal field fires are also disasters worldwide, and have very serious coal field fire problems abroad, mainly including countries of the united states, india, indonesia, uk and the like. Meanwhile, a large number of working faces are close to the goaf to spontaneously ignite in the coal mining process.

At present, scholars at home and abroad mainly use relevant theories and experiments of coal spontaneous combustion process to research fire occurrence, evolution and development of coal fields, and lack relevant theories and technical support of fire development of coal fields. The method has the advantages that the research on the distribution and development of coal rock fractures in the fire of the coal field is less, no specific development rule is found, the diffusion characteristic of the fire cannot be clearly mastered, and the high-temperature range of the fire is difficult to accurately position. Therefore, it is difficult to precisely control the fire. The method can provide theoretical basis and scientific guarantee for the control of the coal field fire disaster and provide basis for further researching the relation and characteristics among coal, rock and gas in the further research of the coal field fire disaster evolution process. At present, a relatively comprehensive and systematic test bed and a test method for the coal field fire area evolution process are not available at home and abroad.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a device and a method for simulating and testing the thermodynamic process of coal fire disasters with different scales so as to solve the problems in the technical background.

The purpose of the invention is realized by the following technical scheme:

a coal fire disaster thermodynamic process simulation test device with different scales comprises a physical similarity simulation test bed, a transparent heat shield, a wireless ad hoc network temperature measurement system, a particle radiation monitoring stress state system and a gas monitoring system;

the physical analog simulation test bed comprises a test bed base, a detachable channel steel, a lower bottom plate and an auxiliary plate; the lower base plate is fixedly arranged on the upper surface of the test bed base, a plurality of screw holes with the same size and equal intervals are arranged on the lower base plate and the detachable channel steel, the detachable channel steel is fixedly arranged on the upper side, the lower side, the left side and the right side of the lower base plate through bolts and screw holes, the auxiliary plate is detachably and slidably connected with the left side edge of the lower base plate through a bearing, and the auxiliary plate and the lower base plate surface form an adjustable inclination angle;

the transparent heat shield is covered on the physical simulation test bed and comprises an upper top plate, a left side plate, a right side plate, a rear panel, a front panel and a smoke exhaust device, wherein the upper top plate, the left side plate, the right side plate and the rear panel are of an integrated structure, and the front panel is connected with the left side plate and the right side plate in an up-down pull type manner; the smoke exhaust device is fixedly arranged on the inner wall above the right side of the rear panel;

the wireless ad-hoc network temperature measuring system comprises an oxygen supply device, an air compressor, a heating device, a wireless transmission module, thermocouples and thermocouple analog-to-digital converters, wherein the outlet end of the oxygen supply device is connected with the inlet end of the air compressor, the thermocouples, the thermocouple analog-to-digital converters and the wireless transmission module comprise a plurality of thermocouples, thermocouple analog-to-digital converters and wireless transmission modules, each thermocouple is connected with one thermocouple analog-to-digital converter, each thermocouple analog-to-digital converter is connected with one wireless transmission module, and each wireless transmission module is in communication connection with a gateway in an ad-hoc network mode, is accessed into an Internet network and is in communication connection with a computer;

the particle radiation stress state monitoring system comprises a rod-shaped stress sensor, a power signal wire and a stress detector, wherein the rod-shaped stress sensor is arranged in a screw hole in the detachable channel steel, and the rod-shaped stress sensor is electrically connected with the stress monitor through the power signal wire;

the gas monitoring system comprises a gas sensor and a gas monitor, and the gas sensor is electrically connected with the gas monitor through a signal line.

Further, the size of test bench base is 1800mm x 1200mm x 100mm, the size of dismantling the channel-section steel is 1400mm x 120mm x 50mm or 700mm x 120mm x 50mm, the auxiliary plate size is 800mm x 700mm, the size of lower base plate is 1600mm x 1400mm, can dismantle on the channel-section steel and the interval of two adjacent screw holes on the lower base plate is 100 mm.

Further, go up roof, left side board, right side board, back panel and front panel size and be 2200mm x 1600mm, and go up roof, left side board, right side board, back panel and front panel and adopt transparent high temperature resistant material to make.

Further, the physical similarity simulation test bed can adjust the length, the width and the height by increasing or reducing the number of the detachable channel steel.

Further, the gas monitor and the stress detector are electrically connected with a computer through data lines.

Furthermore, the adjustable inclination angle formed by the auxiliary plate and the lower bottom plate surface ranges from 0 degree to 90 degrees

A thermal power process simulation test method for coal fire disasters with different scales is characterized by comprising the following steps:

s1, designing conditions required by fire of the experimental coal field or mine goaf evolution;

s2, selecting the number and the specification of detachable channel steel according to design conditions, building a model frame of the physical similarity simulation test bed, adjusting an auxiliary plate to select a corresponding inclination angle to arrange a required coal rock stratum, and arranging thermocouples in the coal rock stratum at the adjacent interval of 100 mm;

s3, standing the built physical analog simulation test bed model, and waiting for solidification and forming; meanwhile, other components are connected according to requirements;

s4, heating the experimental coal bed through the oxygen supply device and the heating device, igniting the coal bed, and timely inserting the gas sensor into the air supply channel when the coal bed fire area collapses to generate cracks to form the air supply channel;

and S5, monitoring the evolution process through the thermocouple, the rod-shaped stress sensor and the gas sensor, and analyzing the detection data through the thermocouple, the rod-shaped stress sensor and the gas sensor.

The invention has the beneficial effects that: the invention can realize the coal field fire hazard and the evolution process of the mine goaf under different conditions, and can realize the real-time monitoring of the distribution of the temperature field, the distribution and development rule of the coal rock cracks and the change rule of the coal rock crack air supply channel in the coal field fire hazard and the mine goaf evolution process through the wireless ad hoc network temperature measuring system, the particle radiation monitoring stress state system and the gas monitoring system; oxygen supply within the concentration range of 0-100% can be realized by adjusting the oxygen supply device, so that the field gas environment is simulated; coal rock layers with different inclination angles are arranged by adjusting the auxiliary plate in the lower bottom plate, the inclination angle range can be controlled within 0-90 degrees, and the accuracy of a physical model experiment and the similarity with the site are improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a physical analog simulation test stand of the present invention;

FIG. 3 is a schematic view of a removable channel of the present invention;

FIG. 4 is a schematic view of a test stand base of the present invention;

FIG. 5 is a schematic diagram of a wireless ad hoc network temperature measurement system of the present invention;

FIG. 6 is a schematic view of the invention simulating coal field fire zone fissure distribution and air supply channel;

FIG. 7 is a flow chart of a simulation test method according to the present invention.

In the figure, 1-a physical similarity simulation test bed, 2-a transparent heat shield, 6-a test bed base, 7-a detachable channel steel, 8-a lower bottom plate, 9-an upper top plate, 10-a left side plate, 11-a right side plate, 12-a rear panel, 13-a front panel, 14-an oxygen supply device, 15-an air compressor, 16-a heating device, 17-a wireless transmission module, 18-a thermocouple, 19-a thermocouple analog-to-digital converter, 20-a computer, 21-a rod type stress sensor, 22-a power supply signal wire, 23-a stress detector, 24-a gas sensor and 25-a gas monitor.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in practical implementation, and the type, amount and ratio of the components in practical implementation may be changed arbitrarily, and the layout of the components may be complicated.