CN110779674B - Experimental device and experimental method for determining ventilation thermal resistance of roadway in mine fire period - Google Patents

Experimental device and experimental method for determining ventilation thermal resistance of roadway in mine fire period Download PDF

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CN110779674B
CN110779674B CN201911069653.4A CN201911069653A CN110779674B CN 110779674 B CN110779674 B CN 110779674B CN 201911069653 A CN201911069653 A CN 201911069653A CN 110779674 B CN110779674 B CN 110779674B
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CN110779674A (en
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李宗翔
苗春桐
李腾
张明乾
刘宇
胡东杰
耿锋
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Liaoning Technical University
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Abstract

The experimental device and the experimental method for measuring the ventilation thermal resistance of the roadway in the period of mine fire comprise a ventilator, a first steel pipe, a combustion furnace, an electric heating pipe, a holding furnace, an inlet air speed sensor, an inlet pressure sensor, an inlet temperature and humidity sensor, a second steel pipe, an outlet air speed sensor, an outlet temperature and humidity sensor, an outlet pressure sensor, a pressure acquisition module, a temperature and humidity acquisition module, an air speed acquisition module, a data storage module and a temperature rise control module; the experimental method for measuring the ventilation thermal resistance of the roadway in the mine fire period comprises the following steps: step 1, building an experimental device; step 2, checking whether the connection of the experimental device is normal and checking the sealing performance; step 3, igniting combustible materials and recording data; step 4, heating through an electric heating pipe, and recording data; step 5, collating experimental data; and 6, drawing a curve. The method has important significance for making underground disaster prevention measures and ventilation decision in catastrophe period and selecting disaster avoiding routes in mines.

Description

Experimental device and experimental method for determining ventilation thermal resistance of roadway in mine fire period
Technical Field
The invention relates to the technical field of mine fire prevention and control, in particular to an experimental device and an experimental method for measuring roadway ventilation thermal resistance in a mine fire period.
Background
Mine fires are one of the main natural disasters in coal mining production work. The occurrence of underground fires can destroy coal resources and equipment, because underground air supply is limited, combustible substances are difficult to completely burn, a large amount of high-temperature smoke flow and harmful gas are generated, the life safety of workers is threatened, and even mine gas and coal dust explosion can be induced to cause greater harm.
When a fire disaster occurs underground, the generated high-temperature smoke flow can damage the original ventilation system of a mine, so that the wind flow is disturbed, and difficulty is brought to ventilation decision in the fire disaster period. One of the main problems of mine fire period ventilation research is the measurement of roadway ventilation thermal resistance, the previous experimental research aiming at thermal resistance mainly focuses on the description of resistance characteristics of local fire combustion, the existing theory divides the fire zone resistance into thermal expansion resistance generated by a combustion zone and local barrier resistance of flame to airflow, and provides the calculation of throttling local thermal resistance generated by a combustion point of the fire zone by using an energy-momentum equation. The thermal resistance of the temperature-rising wind flow and the resistance of the normal-temperature wind flow are not different in calculation, and still comprise friction (thermal) resistance and local (thermal) resistance, and the difference is that the external wind source resistance of the flame combustion flue gas should be added at the same time. Because it is difficult to actually measure the ventilation thermal resistance of the mine roadway when a mine fire occurs, the ventilation thermal resistance of the mine fire roadway is usually calculated through laboratory simulation.
At present, experiments aiming at mine tunnel ventilation thermal resistance do not distinguish mixed smoke flow hot air flow from pure hot air flow, and relevant basic parameters such as temperature, humidity, pressure, air speed and the like can not be continuously acquired.
Disclosure of Invention
The invention aims to provide an experimental device for measuring the ventilation thermal resistance of a roadway in a mine fire period, which can simulate the combustion process of a mine fire source through the experimental device, analyze and measure the ventilation thermal resistance of the roadway in the mine fire period and provide accurate basis for ventilation decision and disaster avoidance route selection in the mine fire period.
In order to achieve the purpose, the invention adopts the following technical scheme:
an experimental device for measuring the ventilation thermal resistance of a roadway in a mine fire period comprises a first steel pipe, a second steel pipe and a heat preservation furnace, wherein the inlet end of the first steel pipe is connected with a ventilator, the outlet end of the second steel pipe is in threaded connection with one side of the heat preservation furnace, the other side of the heat preservation furnace is in threaded connection with the inlet end of the second steel pipe, the first steel pipe and the second steel pipe are used for providing an air flow channel to simulate a mine underground roadway, an inlet temperature and humidity sensor, an inlet pressure sensor and an inlet air speed sensor are sequentially arranged in the inner cavity of the inlet end of the second steel pipe, the inlet air speed sensor is arranged close to one side of the heat preservation furnace, an outlet pressure sensor, an outlet temperature and humidity sensor and an outlet air speed sensor are sequentially arranged in the inner cavity of the outlet end of the second steel pipe, the outlet air speed sensor, the inlet pressure sensor and the outlet pressure sensor are connected with the pressure acquisition module through signal transmission lines, the inlet temperature and humidity sensor and the outlet temperature and humidity sensor are connected with the temperature and humidity acquisition module through signal transmission lines, the pressure acquisition module, the temperature and humidity acquisition module and the wind speed acquisition module are all connected with the data storage module, the data storage module is connected with a computer through data lines, a combustion furnace is arranged at the bottom end of the heat preservation furnace, an electric heating pipe is installed on the side wall of the heat preservation furnace at the top of the combustion furnace, the electric heating pipe is connected with one end of a heat-resisting wire, and the other end of the heat-resisting wire penetrates through the top.
The electric heating pipe is a heating element made of a copper pipe and an electric heating wire, the electric heating wire is installed inside the copper pipe and is connected with the heating control module through a high-temperature-resistant lead, and the electric heating pipe is used for providing a stable heat source and simulating the heat source in a mine fire disaster in a non-smoke state.
The distance between the inlet temperature and humidity sensor and the outer side wall of the heat preservation furnace is 1.0-1.2m, and the distance between the outlet temperature and humidity sensor and the end of the second steel pipe is 0.2-0.3 m; the distance between the inlet pressure sensor and the outer side wall of the heat preservation furnace is 0.9-1.0m, and the distance between the outlet pressure sensor and the end of the second steel pipe is 0.1-0.2 m; the distance between the inlet wind speed sensor and the outer side wall of the heat preservation furnace is 0.8-0.9m, and the distance between the outlet wind speed sensor and the end of the second steel pipe is 0.3-0.4 m.
The data storage module is used for receiving and storing data and comprises a USB data collector and a notebook computer, wherein the input end of the USB data collector is respectively connected with the signal output ends of the temperature and humidity acquisition module, the pressure acquisition module and the wind speed acquisition module, the output end of the USB data collector is connected with a USB interface of the notebook computer, a data acquisition program developed based on Labview software is installed in the notebook computer, the acquisition of 8-channel data is realized, a data acquisition observation control interface is provided, the starting and stopping and time intervals of each data acquisition line can be controlled, the acquired data are stored in an excel file, and the data can be conveniently called and processed in the later period.
The temperature and humidity acquisition module is used for acquiring temperature and humidity data and comprises a temperature and humidity sensor signal conveyor, an RS485 digital signal-to-USB signal data conversion card and a USB data line; the input end of the temperature and humidity sensor signal conveyor is respectively connected with the output ends of the inlet temperature and humidity sensor and the outlet temperature and humidity sensor, and the output end of the temperature and humidity sensor signal conveyor is connected with the input end of the USB data collector through an RS485 digital signal-to-USB signal data conversion card and a USB data line.
The pressure acquisition module is used for acquiring data of the absolute pressure of the wind current and comprises a pressure sensor signal transmitter, a power adapter, a voltage signal-to-USB signal data conversion card and a USB data line; the power interface of the pressure sensor signal transmitter is connected with the power adapter, the input end of the pressure sensor signal transmitter is respectively connected with the output ends of the inlet pressure sensor and the outlet pressure sensor, and the output end of the pressure sensor signal transmitter is connected with the input end of the USB data collector through the voltage signal-to-USB signal data conversion card and the USB data line.
The wind speed acquisition module is used for acquiring data of wind flow and wind speed and comprises a wind speed sensor signal conveyor, an RS485 digital signal-to-USB signal data conversion card and a USB data line; the input end of the air speed sensor signal conveyor is respectively connected with the output ends of the inlet pressure sensor and the outlet pressure sensor, and the output end of the air speed sensor signal conveyor is connected with the input end of the USB data collector through an RS485 digital signal-to-USB signal data conversion card and a USB data line.
The temperature rise control device controls the temperature rise of the electric heating pipe and comprises a thermoelectric actuator, a master control electric box and a heat-resisting lead; one end of the master control electric box is connected with a power line, and the other end of the master control electric box is connected with the electric heating pipe through the thermoelectric actuator and the heat-resistant lead; wherein the master control electric box is provided with a temperature adjusting knob, the temperature of the electric heating pipe is controlled by the temperature adjusting knob, and the temperature range can be adjusted to be 10-220 ℃.
An experimental method for determining the ventilation thermal resistance of a roadway in a mine fire period adopts an experimental device for determining the ventilation thermal resistance of the roadway in the mine fire period, and comprises the following steps:
step 1, building an experimental device, namely firstly installing polyurethane heat-preservation pipe sleeves on a first steel pipe and a second steel pipe, then butting and assembling the first steel pipe and the second steel pipe with a heat-preservation furnace connector, and supporting and fixing the first steel pipe and the second steel pipe by using wood blocks; secondly, connecting an inlet temperature and humidity sensor and an outlet temperature and humidity sensor with a temperature and humidity acquisition module, connecting an inlet pressure sensor and an outlet pressure sensor with a pressure acquisition module, and connecting an inlet wind speed sensor and an outlet wind speed sensor with a wind speed acquisition module; finally, the pressure acquisition module, the temperature and humidity acquisition module and the wind speed acquisition module are connected with the data storage module, the data storage module is connected with the notebook computer, the power supply is switched on, the data storage module is operated, and a data recording time interval is set through a data acquisition program developed based on Labview software in the notebook computer;
2, putting a proper amount of combustible materials into a combustion furnace by using balance; switching on a power supply to start the ventilator, debugging the wind speed of the ventilator, checking whether the connection of an inlet wind speed sensor and an outlet wind speed sensor with a wind speed acquisition module is normal or not by observing a data acquisition control interface of a data acquisition program developed based on Labview software in a notebook computer, checking whether the connection of the inlet temperature and humidity sensor and the outlet temperature and humidity sensor with the temperature and humidity acquisition module is normal or not, and checking whether the connection of the inlet pressure sensor and the outlet pressure sensor with the pressure acquisition module is normal or not; if the communication state indication part shows 'success', the line connection is normal; if the communication state indication position shows 'failure', checking whether the inlet air speed sensor, the outlet air speed sensor and the connecting port of the air speed acquisition module are short-circuited, checking whether the inlet temperature and humidity sensor, the outlet temperature and humidity sensor and the connecting port of the temperature and humidity acquisition module are short-circuited, checking whether the inlet pressure sensor, the outlet pressure sensor and the connecting port of the pressure acquisition module are short-circuited, and if the short-circuited, re-connecting the ports; meanwhile, the air tightness of the device is checked, soapy water is smeared at all the positions of the connecting ports, and if no bubbles are generated, the air tightness is good; if bubbles are generated, indicating that air leaks from the interface where the bubbles are generated, disconnecting the power supply, stopping the work of the ventilator, coating the sealant on the interface where the bubbles are generated to strengthen the sealing, standing for 20-30min, switching on the power supply to start the ventilator again, coating soapy water on the interface where the sealant is coated again, and entering the step 3 if no bubbles are generated; if bubbles are generated at the interface, repeating the steps until no bubbles are generated;
and step 3: igniting the combustible, and operating the data storage module to start data storage and recording; starting a ventilator, enabling an air flow to reach a combustion furnace through a first steel pipe, enabling the air flow to be heated and mixed with a smoke flow generated by combustion of a coal sample to enter a second steel pipe, inducing signals by an inlet air speed sensor, an inlet pressure sensor, an inlet temperature and humidity sensor, an outlet air speed sensor, an outlet temperature and humidity sensor and an outlet pressure sensor, transmitting the signals to an air speed acquisition module, a pressure acquisition module and a temperature and humidity acquisition module through signal transmission lines, transmitting data to a data storage module through the pressure acquisition module, the temperature and humidity acquisition module and the air speed acquisition module through the signal transmission lines, and recording and storing the data by the data storage module;
and 4, step 4: stopping operating the data storage module after the combustible materials are burnt out and no combustion gas is generated, and storing the data into an excel table through a computer; the ventilator keeps ventilation, the temperature rise control module is started to heat the electric heating pipe, the data storage module is operated again to start data storage and recording, and a data recording time interval is set through a data acquisition program developed based on Labview software in the notebook computer; controlling the temperature of the electric heating pipe to rise through a temperature adjusting knob on a master control electric box device in the temperature rise control module, and stopping the operation of the data storage module and the temperature rise control module until the specified temperature is reached; during the period, the air flow reaches the combustion furnace through the first steel pipe, the air flow enters the second steel pipe after being heated in the heat preservation furnace under the action of the electric heating pipe, signals are generated by induction of the inlet air speed sensor, the inlet pressure sensor, the inlet temperature and humidity sensor, the outlet air speed sensor, the outlet temperature and humidity sensor and the outlet pressure sensor and are transmitted to the air speed acquisition module, the pressure acquisition module and the temperature and humidity acquisition module through signal transmission lines, the pressure acquisition module, the temperature and humidity acquisition module and the air speed acquisition module transmit data to the data storage module through the signal transmission lines, the data storage module records, stores and records the data, and the experiment is finished;
and 5: after the experiment is finished, finishing the experimental data;
the additional flue gas air flow density at the inlet is calculated according to the following formula:
ρ1 flue gas＝(MW1/22.414)*273.15/(T1+273.15)*(P1/1.013)
Where ρ is1 flue gasThe unit of g/cm is added for the density of the flue gas wind flow at the inlet3；MW1The average molecular weight of the coal-fired flue gas is 29.7; t is1Measuring the temperature of the air flow by a temperature and humidity sensor at an inlet, wherein the unit is K; p1Measuring the absolute pressure of the wind flow in Pa for an inlet pressure sensor;
the additional flue gas air flow density at the inlet is calculated according to the following formula:
ρ2 flue gas＝(MW2/22.414)*273.15/(T2+273.15)*(P2/1.013)
Where ρ is2 flue gasThe outlet is added with the density of the flue gas wind flow in g/cm3；MW2The average molecular weight of the coal-fired flue gas is 29.5; t is1Measuring the temperature of the air flow by a temperature and humidity sensor at an outlet, wherein the unit is K; p1Measuring the absolute pressure of the wind flow by an outlet pressure sensor, wherein the unit is Pa;
further, the wind flow thermal resistance of the additional flue gas is calculated according to the following formula:
h＝(P1-P2)+(ρ1 flue gasv1 2-ρ2 flue gasv2 2)/2
Wherein h is the wind flow thermal resistance of the additional flue gas, Pa; p1-the inlet pressure sensor measures the wind flow absolute pressure, Pa;P2-the outlet pressure sensor measures the wind flow absolute pressure, Pa; rho1 flue gasThe density of the additional flue gas stream at the inlet in g/cm3；ρ2 flue gas-density of additional flue gas stream at the outlet in g/cm3；v1-the inlet wind speed sensor measures the wind flow velocity, m/s; v. of2-the outlet wind speed sensor measures the wind flow speed, m/s;
further, the wind flow density without additional flue gas is calculated according to the following formula:
Figure GDA0002815469730000041
wherein i is a measuring point serial number, an inlet is marked as 1, and an outlet is marked as 2; rhoiThe unit is g/cm without additional smoke air flow density3；PiMeasuring the absolute pressure of the wind flow by a pressure sensor, wherein the unit is Pa; t isiMeasuring the temperature of the wind flow for a temperature and humidity sensor, wherein the unit is K;
Figure GDA0002815469730000051
measuring the wind flow humidity for a temperature and humidity sensor, and expressing the wind flow humidity by using a decimal number; psThe saturated water vapor partial pressure at the temperature T is expressed in Pa;
further, the wind flow thermal resistance without additional smoke is calculated according to the following formula:
h＝(P1-P2)+(ρ1v1 2-ρ2v2 2)/2
wherein, h-the wind flow thermal resistance of the additional smoke gas, Pa; p1-the inlet pressure sensor measures the wind flow absolute pressure, Pa; p2-the outlet pressure sensor measures the wind flow absolute pressure, Pa; rho1-no additional flue gas air flow density at the inlet, in g/cm3；ρ2Density of the air stream at the outlet without additional flue gas in g/cm3；v1-the inlet wind speed sensor measures the wind flow velocity, m/s; v. of2-the outlet wind speed sensor measures the wind flow speed, m/s;
step 6: inputting data into computer software to obtain an air flow thermal resistance curve 1 and a simple temperature-resistance change relation curve 2 of the additional flue gas, as shown in the figure I; wherein the curve 1 is a curve of thermal resistance of the ventilation roadway changing along with temperature under the state of additional smoke flow; curve 2 is the thermal resistance of the ventilation tunnel as a function of temperature without additional smoke flow.
2, measuring a proper amount of combustible materials by using a balance, putting the combustible materials into a combustible material heat preservation furnace, and measuring 200g of combustible materials when the combustible materials are alcohol; when the combustible is a coal sample, the amount is 100-150 g; when the combustible is wood material, the measurement amount is 150-200 g.
The invention has the beneficial effects that: the experimental device for determining the ventilation thermal resistance of the roadway in the mine fire period can simulate the ventilation condition of the roadway in the mine fire period so as to determine and calculate the ventilation thermal resistance of the roadway in the mine fire period; the experimental device can achieve the purpose and separate the exogenous smoke resistance generated in the combustion process; the experimental device can simulate experiments according to different combustibles to obtain the influence of the combustion of the different combustibles on the ventilation resistance of the mine; the invention can realize continuous data acquisition and data program processing, and the data result is more accurate; the experimental device provided by the invention has the advantages of simple structure, low cost and capability of repeated experiments.
In order to enable the measured ventilation thermal resistance of the mine roadway to be more in line with the actual situation of the ventilation thermal resistance of the roadway in the mine fire period, the experimental device for measuring the ventilation thermal resistance of the roadway in the mine fire period is provided to measure the ventilation thermal resistance of the roadway in the mine fire period, provide a basis for simulating and simulating ventilation network calculation in the fire period, and have important significance for making underground disaster prevention measures for the mine and making ventilation decisions in the catastrophe period and selecting disaster avoidance routes.
Drawings
FIG. 1 is a schematic view of a device for measuring ventilation resistance of a roadway during a mine fire;
FIG. 2 is a data acquisition program control interface based on Labview software development;
FIG. 3 is a graph of experimental results simulating mine ventilation thermal resistance as a function of temperature;
1-a ventilator; 2-a first steel tube; 3-a combustion furnace; 4-an electric heating tube; 5-holding furnace; 6-inlet wind speed sensor; 7-inlet pressure sensor; 8-inlet temperature and humidity sensor; 9-a second steel pipe; 10-outlet wind speed sensor; 11-outlet temperature and humidity sensor; 12-an outlet pressure sensor; 13-a pressure acquisition module; 14-a temperature and humidity acquisition module; 15-a wind speed acquisition module; 16-a data storage module; and 17-a temperature rise control module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
As shown in figure 1, the experimental device for measuring the ventilation thermal resistance of the roadway during the mine fire comprises a first steel pipe 2 with the diameter of 60mm and the length of 1m, a second steel pipe 9 with the diameter of 50mm and the length of 19m and a holding furnace 5, wherein the inlet end of the first steel pipe 2 is connected with a ventilator 1, the ventilator 1 is a direct-current press-in type ventilator, is matched with a 12V/3A direct-current power supply for use, is used for providing ventilation power for the whole experimental pipeline and ensuring enough oxygen supply for combustible materials in a combustion furnace 3, and the ventilator 1 is SH-196 in model. The power of the ventilator 1 can be adjusted according to the actual conditions of different experimental roadways to achieve the wind speed and the wind quantity required by the experiment, the outlet end of the second steel pipe 9 is in threaded connection with one side of the heat preservation furnace 5, the other side of the heat preservation furnace 5 is in threaded connection with the inlet end of the second steel pipe 9, the first steel pipe 2 and the second steel pipe 9 are used for providing a wind flow channel to simulate the underground roadway of a mine, the outer walls of the first steel pipe 2 and the second steel pipe 9 are wrapped with detachable heat preservation sleeves to enable the first steel pipe 2 and the second steel pipe 9 to be closer to the heat dissipation environment of surrounding rocks of the roadway and play a role in safety protection, the heat preservation furnace 5 is made of aluminum silicate heat preservation materials and plays a role in heat insulation and preservation, an inlet temperature and humidity sensor 8, an inlet pressure sensor 7 and an inlet wind speed sensor 6 are sequentially arranged in the inner cavity of the, an outlet pressure sensor 12, an outlet temperature and humidity sensor 11 and an outlet air speed sensor 10 are sequentially arranged in an outlet end inner cavity of the second steel pipe 9, the outlet air speed sensor 10 is arranged close to one side of an inlet temperature and humidity sensor 8, the output ends of the inlet air speed sensor 6 and the outlet air speed sensor 10 are connected with an air speed acquisition module 15 through signal transmission lines, the output ends of the inlet pressure sensor 7 and the outlet pressure sensor 12 are connected with a pressure acquisition module 13 through signal transmission lines, the output ends of the inlet temperature and humidity sensor 8 and the outlet temperature and humidity sensor 11 are connected with a temperature and humidity acquisition module 14 through signal transmission lines, the pressure acquisition module 13, the temperature and humidity acquisition module and the air speed acquisition module 15 are all connected with a data storage module 16, the data storage module 16 is connected with a computer through data lines, and a combustion furnace 3 is, the combustion furnace 3 is used for containing combustible materials, the whole combustion furnace is made of high-temperature-resistant carbon silicon materials, the combustible materials are subjected to combustion reaction in the combustion furnace 3 to generate smoke flow and heat simultaneously, the combustion of the combustible materials in underground fire hazard is simulated, different types of combustible materials can be subjected to experimental simulated combustion according to needs, an electric heating pipe is arranged on the side wall of a heat preservation furnace 5 at the top of the combustion furnace 3, an electric heating pipe 4 is connected with one end of a heat-resistant lead, and the other end of the heat-resistant lead penetrates through the top of the heat preservation furnace 5 to be connected with a heating control module; the inlet temperature and humidity sensor 8 and the outlet temperature and humidity sensor 11 are ceramic probe temperature and humidity sensors and are used for sensing the temperature and the humidity of the air flow, wherein the temperature range is-50 ℃ to 350 ℃, the precision is 0.5 grade, the humidity range is 0% RH to 100% RH, and the precision is 5% RH; the inlet pressure sensor 7 and the outlet pressure sensor 12 are both piezoelectric ceramic pressure sensors and are used for sensing the absolute pressure of wind current, the range of the pressure sensors is-10 kpa, and the comprehensive precision is +/-0.25% FS; the inlet wind speed sensor 6 and the outlet wind speed sensor 10 are both high-temperature dust-resistant heat-sensitive wind speed sensors and are used for sensing the wind speed of wind current, the sensors can work in the environment of minus 20 to plus 250 ℃, the wind speed range can be measured by 0.1 to 100m/s, and the accuracy is +/-1 to 2.5 percent.
The electric heating pipe 4 is a heating element made of a copper pipe and an electric heating wire, the electric heating wire is installed inside the copper pipe and is connected with the heating control module 17 through a high-temperature-resistant lead, and the electric heating wire is used for providing a stable heat source and simulating the heat source in a mine fire disaster in a non-smoke state.
The distance between the inlet temperature and humidity sensor 8 and the outer side wall of the holding furnace 5 is 1.0m, and the distance between the outlet temperature and humidity sensor 11 and the end of the second steel pipe 9 is 0.2 m; the distance between the inlet pressure sensor 7 and the outer side wall of the holding furnace 5 is 0.9m, and the distance between the outlet pressure sensor 12 and the end of the second steel pipe 9 is 0.1 m; the distance between the inlet air speed sensor 6 and the outer side wall of the holding furnace 5 is 0.8m, and the distance between the outlet air speed sensor 10 and the end of the second steel pipe 9 is 0.3 m.
The data storage module 16 is used for receiving and storing data and comprises a USB data collector and a notebook computer, wherein the input end of the USB data collector is respectively connected with the signal output ends of the temperature and humidity acquisition module 14, the pressure acquisition module 13 and the wind speed acquisition module 15, the output end of the USB data collector is connected with a USB interface of the notebook computer, a data acquisition program developed based on Labview software is installed in the notebook computer, the acquisition of 8-channel data is realized, a data acquisition observation control interface is configured, the starting and stopping and time intervals of each data acquisition channel can be controlled, the acquired data are stored in an excel file, the data can be conveniently called and processed in the later period, and the USB data collector is USS 9806.
The temperature and humidity acquisition module 14 is used for acquiring temperature and humidity data and comprises a temperature and humidity sensor signal conveyor, an RS485 digital signal-to-USB signal data conversion card and a USB data line; the input end of the temperature and humidity sensor signal conveyor is respectively connected with the output ends of the inlet temperature and humidity sensor 8 and the outlet temperature and humidity sensor 11, and the output end of the temperature and humidity sensor signal conveyor is connected with the input end of the USB data collector through an RS485 digital signal-to-USB signal data conversion card and a USB data line; the model of the temperature and humidity sensor signal conveyor is RS-WS-N01-8, and the model of the conversion card for converting RS485 digital signals into USB signal data is UT-890.
The pressure acquisition module 13 is used for acquiring data of the absolute pressure of the wind current and comprises a pressure sensor signal transmitter, a power adapter, a voltage signal-to-USB signal data conversion card and a USB data line; the power interface of the pressure sensor signal transmitter is connected with the power adapter, the input end of the pressure sensor signal transmitter is respectively connected with the output ends of the inlet pressure sensor 7 and the outlet pressure sensor 12, and the output end of the pressure sensor signal transmitter is connected with the input end of the USB data collector through a voltage signal-to-USB signal data conversion card and a USB data line; the model of the pressure sensor signal transmitter is PX409, the model of the power adapter is MANUAL-30W, and the model of the voltage signal to USB signal data conversion card is EM-9008A.
The wind speed acquisition module 15 is used for acquiring data of wind flow and wind speed, and comprises a wind speed sensor signal conveyor, an RS485 digital signal-to-USB signal data conversion card and a USB data line; the input end of the air speed sensor signal conveyor is respectively connected with the output ends of the inlet pressure sensor 7 and the outlet pressure sensor 12, and the output end of the air speed sensor signal conveyor is connected with the input end of the USB data collector through an RS485 digital signal-to-USB signal data conversion card and a USB data line; the model of the air speed sensor signal transmitter is WD-4140, and the model of the RS485 digital signal-to-USB signal data conversion card is UT-890.
The temperature rise control device controls the temperature rise of the electric heating pipe 4 and comprises a thermoelectric actuator, a master control electric box and a heat-resisting lead; one end of the master control electric box is connected with a power line, and the other end of the master control electric box is connected with the electric heating pipe 4 through the thermoelectric actuator and the heat-resistant conducting wire; wherein the master control electric box is provided with a temperature adjusting knob, the temperature of the electric heating pipe 4 is controlled by the temperature adjusting knob, and the temperature range can be adjusted to be 10-250 ℃; the model of the master control electric box is WBT-4000W, and the model of the thermoelectric actuator is 5198.
An experimental method for determining the ventilation thermal resistance of a roadway in a mine fire period adopts an experimental device for determining the ventilation thermal resistance of the roadway in the mine fire period, and comprises the following steps:
step 1, building an experimental device, namely firstly installing polyurethane heat-insulating pipe sleeves on a first steel pipe 2 and a second steel pipe 9, then butting and assembling the polyurethane heat-insulating pipe sleeves with a connecting port of a heat-insulating furnace 5, and supporting and fixing the first steel pipe 2 and the second steel pipe 9 by using wood blocks; secondly, an inlet temperature and humidity sensor 8 and an outlet temperature and humidity sensor 11 are connected with a temperature and humidity acquisition module 14, an inlet pressure sensor 9 and an outlet pressure sensor 12 are connected with a pressure acquisition module 13, and an inlet wind speed sensor 10 and an outlet wind speed sensor 10 are connected with a wind speed acquisition module 15; finally, the pressure acquisition module 13, the temperature and humidity acquisition module 14 and the wind speed acquisition module 15 are connected with the data storage module 16, the data storage module 16 is connected with the notebook computer, the power supply is switched on, the data storage module 16 is operated, and the data recording time interval is set to be 1s through a data acquisition program developed based on Labview software in the notebook computer;
step 2, weighing 100g of coal sample by using a balance and putting the coal sample into a combustion furnace 3; switching on a power supply to start the ventilator 1, debugging the wind speed of the ventilator 1, checking whether the connection of an inlet wind speed sensor 6 and an outlet wind speed sensor 10 with a wind speed acquisition module 15 is normal or not by observing a data acquisition control interface of a data acquisition program developed based on Labview software in a notebook computer as shown in FIG. 2, checking whether the connection of an inlet temperature and humidity sensor 8 and an outlet temperature and humidity sensor 11 with a temperature and humidity acquisition module 14 is normal or not, and checking whether the connection of an inlet pressure sensor 7 and an outlet pressure sensor 12 with a pressure acquisition module 13 is normal or not; if the communication state indication part shows 'success', the line connection is normal; if the communication state indication position shows 'failure', checking whether short circuits exist at the connection ports of the inlet air speed sensor 6, the outlet air speed sensor 10 and the air speed acquisition module 15, checking whether short circuits exist at the connection ports of the inlet temperature and humidity sensor 8, the outlet temperature and humidity sensor 11 and the temperature and humidity acquisition module 14, checking whether short circuits exist at the connection ports of the inlet pressure sensor 7, the outlet pressure sensor 12 and the pressure acquisition module 13, and if the short circuits exist, re-connecting the circuits; meanwhile, the air tightness of the device is checked, soapy water is smeared at all the positions of the connecting ports, and if no bubbles are generated, the air tightness is good; if bubbles are generated, indicating that air leaks from the interface where the bubbles are generated, turning off the power supply, stopping the work of the ventilator 1, coating the sealant on the interface where the bubbles are generated to strengthen the sealing, standing for 20-30min, switching on the power supply to start the ventilator 1 again, coating soapy water on the interface where the sealant is coated again, and entering the step 3 if no bubbles are generated; if bubbles are generated at the interface, repeating the steps until no bubbles are generated;
and step 3: igniting the coal sample, and operating the data storage module 16 to start data storage recording; starting a ventilator 1, enabling an air flow to reach a combustion furnace 3 through a first steel pipe 2, enabling the air flow to be heated and mixed with a smoke flow generated by combustion of a coal sample to enter a second steel pipe 9, enabling an inlet air speed sensor 6, an inlet pressure sensor 7, an inlet temperature and humidity sensor 8, an outlet air speed sensor 10, an outlet temperature and humidity sensor 11 and an outlet pressure sensor 12 to sense and generate signals and transmit the signals to an air speed acquisition module 15, a pressure acquisition module 13 and a temperature and humidity acquisition module 14 through signal transmission lines, enabling the pressure acquisition module 13, the temperature and humidity acquisition module 14 and the air speed acquisition module 15 to transmit data to a data storage module 16 through the signal transmission lines, and enabling the data storage module 16 to record and store the;
and 4, step 4: stopping operating the data storage module 16 after the coal sample is burnt out and no combustion gas is generated, and storing the data into an excel table through a computer; the ventilator 1 keeps ventilation, the temperature rise control module 17 is started to heat the electric heating pipe 4, the data storage module 16 is operated again to start data storage and recording, and the data recording time interval is set to be 1000ms through a data acquisition program developed based on Labview software in the notebook computer; the temperature of the electric heating pipe 4 is controlled to rise through a temperature adjusting knob on a master control electric box device in a temperature rise control module 17, the initial temperature is set to be 20 ℃, the air flow reaches the combustion furnace 3 through the first steel pipe 2, the air flow is heated in the heat preservation furnace 5 under the action of the electric heating pipe 4 and then enters the second steel pipe 9, signals are generated through induction of an inlet air speed sensor 6, an inlet pressure sensor 7, an inlet temperature and humidity sensor 8, an outlet air speed sensor 10, an outlet temperature and humidity sensor 11 and an outlet pressure sensor 12 and are transmitted to an air speed acquisition module 15, a pressure acquisition module 13 and a temperature and humidity acquisition module 14 through signal transmission lines, the pressure acquisition module 13, the temperature and humidity acquisition module 14 and the air speed acquisition module 15 transmit data to a data storage module 16 through the signal transmission lines, and the data storage module 16 records; during the period, the temperature of the electric heating pipe 4 is controlled to rise through a temperature adjusting knob on a master control electric box device in the temperature rise control module 17, the temperature is adjusted up by 10 ℃ every 6 minutes until the temperature reaches 200 ℃, and the data acquisition is continued to run for 1 minute, and then the data storage module 16 and the temperature rise control module 17 are stopped to run; the experiment is finished;
and 5: after the experiment is finished, finishing the experimental data;
the additional flue gas air flow density at the inlet is calculated according to the following formula:
ρ1 flue gas＝(MW1/22.414)*273.15/(T1+273.15)*(P1/1.013)
Where ρ is1 flue gasThe unit of g/cm is added for the density of the flue gas wind flow at the inlet3；MW1The average molecular weight of the coal-fired flue gas is 29.7; t is1Measuring the temperature of the air flow by a temperature and humidity sensor at an inlet, wherein the unit is K; p1The absolute pressure of the wind flow is measured for the inlet pressure sensor 7 in Pa;
the additional flue gas air flow density at the inlet is calculated according to the following formula:
ρ2 flue gas＝(MW2/22.414)*273.15/(T2+273.15)*(P2/1.013)
Where ρ is2 flue gasThe outlet is added with the density of the flue gas wind flow in g/cm3；MW2The average molecular weight of the coal-fired flue gas is 29.5; t is1Measuring the temperature of the air flow by a temperature and humidity sensor at an outlet, wherein the unit is K; p1The outlet pressure sensor 12 measures the absolute pressure of the wind flow in Pa;
further, the wind flow thermal resistance of the additional flue gas is calculated according to the following formula:
h＝(P1-P2)+(ρ1 flue gasv1 2-ρ2 flue gasv2 2)/2
Wherein h is the wind flow thermal resistance of the additional flue gas, Pa; p1The inlet pressure sensor 7 measures the wind flow absolute pressure, Pa; p2The outlet pressure sensor 12 measures the wind flow absolute pressure, Pa; rho1 flue gasThe density of the additional flue gas stream at the inlet in g/cm3；ρ2 flue gas-density of additional flue gas stream at the outlet in g/cm3；v1The inlet wind speed sensor 6 measures the wind flow speed, m/s; v. of2Outlet wind speedThe sensor 10 measures the wind flow speed, m/s;
further, the wind flow density without additional flue gas is calculated according to the following formula:
Figure GDA0002815469730000101
wherein i is a measuring point serial number, an inlet is marked as 1, and an outlet is marked as 2; rhoiThe unit is g/cm without additional smoke air flow density3；PiMeasuring the absolute pressure of the wind flow by a pressure sensor, wherein the unit is Pa; t isiMeasuring the temperature of the wind flow for a temperature and humidity sensor, wherein the unit is K;
Figure GDA0002815469730000102
measuring the wind flow humidity for a temperature and humidity sensor, and expressing the wind flow humidity by using a decimal number; psThe saturated water vapor partial pressure at the temperature T is expressed in Pa;
further, the wind flow thermal resistance without additional smoke is calculated according to the following formula:
h＝(P1-P2)+(ρ1v1 2-ρ2v2 2)/2
wherein, h-the wind flow thermal resistance of the additional smoke gas, Pa; p1The inlet pressure sensor 7 measures the wind flow absolute pressure, Pa;
P2the outlet pressure sensor 12 measures the wind flow absolute pressure, Pa; rho1-no additional flue gas air flow density at the inlet, in g/cm3；
ρ2Density of the air stream at the outlet without additional flue gas in g/cm3；v1The inlet wind speed sensor 6 measures the wind flow speed, m/s; v. of2The outlet wind speed sensor 10 measures the wind flow velocity, m/s;
step 6: inputting data into computer software to obtain an airflow thermal resistance curve 1 and a simple temperature-resistance change relation curve 2 of the additional flue gas, as shown in FIG. 3; wherein the curve 1 is a curve of thermal resistance of the ventilation roadway changing along with temperature under the state of additional smoke flow; curve 2 is the thermal resistance of the ventilation tunnel as a function of temperature without additional smoke flow.

Claims (9)

1. An experimental method for measuring the ventilation thermal resistance of a roadway in a mine fire period is adopted, the experimental device for measuring the ventilation thermal resistance of the roadway in the mine fire period comprises a first steel pipe, a second steel pipe and a holding furnace, the inlet end of the first steel pipe is connected with a ventilator, the outlet end of the second steel pipe is in threaded connection with one side of the holding furnace, the other side of the holding furnace is in threaded connection with the inlet end of the second steel pipe, the first steel pipe and the second steel pipe are used for providing an air flow channel to simulate the mine underground roadway, an inlet temperature and humidity sensor, an inlet pressure sensor and an inlet air speed sensor are sequentially arranged in the inner cavity of the inlet end of the second steel pipe, the inlet air speed sensor is arranged close to one side of the holding furnace, an outlet pressure sensor, an outlet temperature and humidity sensor and an outlet air speed sensor are sequentially arranged in the, the system comprises an inlet air speed sensor, an outlet air speed sensor, a temperature and humidity acquisition module, a data storage module, a combustion furnace, an electric heating pipe and a heat-resisting lead, wherein the inlet air speed sensor and the outlet air speed sensor are connected with the air speed acquisition module through signal transmission lines; the method is characterized by comprising the following steps:
step 1, constructing an experimental device, namely installing polyurethane heat-insulating pipe sleeves on a first steel pipe and a second steel pipe, then butting and assembling the first steel pipe and the second steel pipe with a heat-insulating furnace connecting port, and supporting and fixing the first steel pipe and the second steel pipe by using wood blocks; secondly, connecting an inlet temperature and humidity sensor and an outlet temperature and humidity sensor with a temperature and humidity acquisition module, connecting an inlet pressure sensor and an outlet pressure sensor with a pressure acquisition module, and connecting an inlet wind speed sensor and an outlet wind speed sensor with a wind speed acquisition module; finally, the pressure acquisition module, the temperature and humidity acquisition module and the wind speed acquisition module are connected with the data storage module, the data storage module is connected with the notebook computer, the power supply is switched on, the data storage module is operated, and a data recording time interval is set through a data acquisition program developed based on Labview software in the notebook computer;
2, putting a proper amount of combustible materials into a combustion furnace by using balance; switching on a power supply to start the ventilator, debugging the wind speed of the ventilator, checking whether the connection of an inlet wind speed sensor and an outlet wind speed sensor with a wind speed acquisition module is normal or not by observing a data acquisition control interface of a data acquisition program developed based on Labview software in a notebook computer, checking whether the connection of the inlet temperature and humidity sensor and the outlet temperature and humidity sensor with the temperature and humidity acquisition module is normal or not, and checking whether the connection of the inlet pressure sensor and the outlet pressure sensor with the pressure acquisition module is normal or not; if the communication state indication part shows 'success', the line connection is normal; if the communication state indication position shows 'failure', checking whether the inlet air speed sensor, the outlet air speed sensor and the connecting port of the air speed acquisition module are short-circuited, checking whether the inlet temperature and humidity sensor, the outlet temperature and humidity sensor and the connecting port of the temperature and humidity acquisition module are short-circuited, checking whether the inlet pressure sensor, the outlet pressure sensor and the connecting port of the pressure acquisition module are short-circuited, and if the short-circuited, re-connecting the ports; meanwhile, the air tightness of the device is checked, soapy water is smeared at all the positions of the connecting ports, and if no bubbles are generated, the air tightness is good; if bubbles are generated, indicating that air leaks from the interface where the bubbles are generated, disconnecting the power supply, stopping the work of the ventilator, coating the sealant on the interface where the bubbles are generated to strengthen the sealing, standing for 20-30min, switching on the power supply to start the ventilator again, coating soapy water on the interface where the sealant is coated again, and entering the step 3 if no bubbles are generated; if bubbles are generated at the interface, repeating the steps until no bubbles are generated;
and step 3: igniting the combustible, and operating the data storage module to start data storage and recording; starting a ventilator, enabling an air flow to reach a combustion furnace through a first steel pipe, enabling the air flow to be heated and mixed with a smoke flow generated by combustion of a coal sample to enter a second steel pipe, inducing signals by an inlet air speed sensor, an inlet pressure sensor, an inlet temperature and humidity sensor, an outlet air speed sensor, an outlet temperature and humidity sensor and an outlet pressure sensor, transmitting the signals to an air speed acquisition module, a pressure acquisition module and a temperature and humidity acquisition module through signal transmission lines, transmitting data to a data storage module through the pressure acquisition module, the temperature and humidity acquisition module and the air speed acquisition module through the signal transmission lines, and recording and storing the data by the data storage module;
and 4, step 4: stopping operating the data storage module after the combustible materials are burnt out and no combustion gas is generated, and storing the data into an excel table through a computer; the ventilator keeps ventilation, the temperature rise control module is started to heat the electric heating pipe, the data storage module is operated again to start data storage and recording, and a data recording time interval is set through a data acquisition program developed based on Labview software in the notebook computer; controlling the temperature of the electric heating pipe to rise through a temperature adjusting knob on a master control electric box device in the temperature rise control module, and stopping the operation of the data storage module and the temperature rise control module until the specified temperature is reached; during the period, the air flow reaches the combustion furnace through the first steel pipe, the air flow enters the second steel pipe after being heated in the heat preservation furnace under the action of the electric heating pipe, signals are generated by induction of the inlet air speed sensor, the inlet pressure sensor, the inlet temperature and humidity sensor, the outlet air speed sensor, the outlet temperature and humidity sensor and the outlet pressure sensor and are transmitted to the air speed acquisition module, the pressure acquisition module and the temperature and humidity acquisition module through signal transmission lines, the pressure acquisition module, the temperature and humidity acquisition module and the air speed acquisition module transmit data to the data storage module through the signal transmission lines, the data storage module records, stores and records the data, and the experiment is finished;
and 5: after the experiment is finished, finishing the experimental data;
the additional flue gas air flow density at the inlet is calculated according to the following formula:
ρ1 flue gas＝(MW1/22.414)*273.15/(T1+273.15)*(P1/1.013)
Where ρ is1 flue gasThe unit of g/cm is added for the density of the flue gas wind flow at the inlet3；MW1The average molecular weight of the coal-fired flue gas is 29.7; t is1Measuring the temperature of the air flow by a temperature and humidity sensor at an inlet, wherein the unit is K; p1Measuring the absolute pressure of the wind flow in Pa for an inlet pressure sensor;
the additional flue gas air flow density at the inlet is calculated according to the following formula:
ρ2 flue gas＝(MW2/22.414)*273.15/(T2+273.15)*(P2/1.013)
Where ρ is2 flue gasThe outlet is added with the density of the flue gas wind flow in g/cm3；MW2The average molecular weight of the coal-fired flue gas is 29.5; t is1Measuring the temperature of the air flow by a temperature and humidity sensor at an outlet, wherein the unit is K; p1Measuring the absolute pressure of the wind flow by an outlet pressure sensor, wherein the unit is Pa;
further, the wind flow thermal resistance of the additional flue gas is calculated according to the following formula:
h＝(P1-P2)+(ρ1 flue gasv1 2-ρ2 flue gasv2 2)/2
Wherein h is the wind flow thermal resistance of the additional flue gas, Pa; p1-the inlet pressure sensor measures the wind flow absolute pressure, Pa; p2-the outlet pressure sensor measures the wind flow absolute pressure, Pa; rho1 flue gasThe density of the additional flue gas stream at the inlet in g/cm3；ρ2 flue gas-density of additional flue gas stream at the outlet in g/cm3；v1-the inlet wind speed sensor measures the wind flow velocity, m/s; v. of2-the outlet wind speed sensor measures the wind flow speed, m/s;
further, the wind flow density without additional flue gas is calculated according to the following formula:
Figure FDA0002815469720000031
wherein i is a measuring point serial number, an inlet is marked as 1, and an outlet is marked as 2; rhoiThe unit is g/cm without additional smoke air flow density3；PiMeasuring the absolute pressure of the wind flow by a pressure sensor, wherein the unit is Pa; t isiMeasuring the temperature of the wind flow for a temperature and humidity sensor, wherein the unit is K;
Figure FDA0002815469720000032
measuring the wind flow humidity for a temperature and humidity sensor, and expressing the wind flow humidity by using a decimal number; psThe saturated water vapor partial pressure at the temperature T is expressed in Pa;
further, the wind flow thermal resistance without additional smoke is calculated according to the following formula:
h＝(P1-P2)+(ρ1v1 2-ρ2v2 2)/2
wherein, h-the wind flow thermal resistance of the additional smoke gas, Pa; p1-the inlet pressure sensor measures the wind flow absolute pressure, Pa; p2-the outlet pressure sensor measures the wind flow absolute pressure, Pa; rho1-no additional flue gas air flow density at the inlet, in g/cm3；ρ2Density of the air stream at the outlet without additional flue gas in g/cm3；v1-the inlet wind speed sensor measures the wind flow velocity, m/s; v. of2-the outlet wind speed sensor measures the wind flow speed, m/s;
step 6: inputting data into computer software to obtain an airflow thermal resistance curve 1 and a simple temperature-resistance change relation curve 2 of the additional flue gas, as shown in FIG. 1; wherein the curve 1 is a curve of thermal resistance of the ventilation roadway changing along with temperature under the state of additional smoke flow; curve 2 is the thermal resistance of the ventilation tunnel as a function of temperature without additional smoke flow.
2. The experimental method for determining the ventilation thermal resistance of the roadway during the mine fire period as claimed in claim 1, wherein: the electric heating pipe is a heating element made of a copper pipe and an electric heating wire, the electric heating wire is installed inside the copper pipe and is connected with the heating control module through a high-temperature-resistant lead, and the electric heating pipe is used for providing a stable heat source and simulating the heat source in a mine fire disaster in a non-smoke state.
3. The experimental method for determining the ventilation thermal resistance of the roadway during the mine fire period as claimed in claim 1, wherein: the distance between the inlet temperature and humidity sensor and the outer side wall of the heat preservation furnace is 1.0-1.2m, and the distance between the outlet temperature and humidity sensor and the end of the second steel pipe is 0.2-0.3 m; the distance between the inlet pressure sensor and the outer side wall of the heat preservation furnace is 0.9-1.0m, and the distance between the outlet pressure sensor and the end of the second steel pipe is 0.1-0.2 m; the distance between the inlet wind speed sensor and the outer side wall of the heat preservation furnace is 0.8-0.9m, and the distance between the outlet wind speed sensor and the end of the second steel pipe is 0.3-0.4 m.
4. The experimental method for determining the ventilation thermal resistance of the roadway during the mine fire period as claimed in claim 1, wherein: the data storage module is used for receiving and storing data and comprises a USB data collector and a notebook computer, wherein the input end of the USB data collector is respectively connected with the signal output ends of the temperature and humidity acquisition module, the pressure acquisition module and the wind speed acquisition module, the output end of the USB data collector is connected with a USB interface of the notebook computer, a data acquisition program developed based on Labview software is installed in the notebook computer, the acquisition of 8-channel data is realized, a data acquisition observation control interface is provided, the starting and stopping and time intervals of each data acquisition line can be controlled, the acquired data are stored in an excel file, and the data can be conveniently called and processed in the later period.
5. The experimental method for determining the ventilation thermal resistance of the roadway during the mine fire period as claimed in claim 1, wherein: the temperature and humidity acquisition module is used for acquiring temperature and humidity data and comprises a temperature and humidity sensor signal conveyor, an RS485 digital signal-to-USB signal data conversion card and a USB data line; the input end of the temperature and humidity sensor signal conveyor is respectively connected with the output ends of the inlet temperature and humidity sensor and the outlet temperature and humidity sensor, and the output end of the temperature and humidity sensor signal conveyor is connected with the input end of the USB data collector through an RS485 digital signal-to-USB signal data conversion card and a USB data line.
6. The experimental method for determining the ventilation thermal resistance of the roadway during the mine fire period as claimed in claim 1, wherein: the pressure acquisition module is used for acquiring data of the absolute pressure of the wind current and comprises a pressure sensor signal transmitter, a power adapter, a voltage signal-to-USB signal data conversion card and a USB data line; the power interface of the pressure sensor signal transmitter is connected with the power adapter, the input end of the pressure sensor signal transmitter is respectively connected with the output ends of the inlet pressure sensor and the outlet pressure sensor, and the output end of the pressure sensor signal transmitter is connected with the input end of the USB data collector through the voltage signal-to-USB signal data conversion card and the USB data line.
7. The experimental method for determining the ventilation thermal resistance of the roadway during the mine fire period as claimed in claim 1, wherein: the wind speed acquisition module is used for acquiring data of wind flow and wind speed and comprises a wind speed sensor signal conveyor, an RS485 digital signal-to-USB signal data conversion card and a USB data line; the input end of the air speed sensor signal conveyor is respectively connected with the output ends of the inlet pressure sensor and the outlet pressure sensor, and the output end of the air speed sensor signal conveyor is connected with the input end of the USB data collector through an RS485 digital signal-to-USB signal data conversion card and a USB data line.
8. The experimental method for determining the ventilation thermal resistance of the roadway during the mine fire period as claimed in claim 1, wherein: the temperature rise control device controls the temperature rise of the electric heating pipe and comprises a thermoelectric actuator, a master control electric box and a heat-resisting lead; one end of the master control electric box is connected with a power line, and the other end of the master control electric box is connected with the electric heating pipe through the thermoelectric actuator and the heat-resistant lead; wherein the master control electric box is provided with a temperature adjusting knob, the temperature of the electric heating pipe is controlled by the temperature adjusting knob, and the temperature range can be adjusted to be 10-220 ℃.
9. The experimental method for determining the ventilation thermal resistance of the roadway during the mine fire period as claimed in claim 1, wherein: 2, measuring a proper amount of combustible materials by using a balance, putting the combustible materials into a combustible material heat preservation furnace, and measuring 200g of combustible materials when the combustible materials are alcohol; when the combustible is a coal sample, the amount is 100-150 g; when the combustible is wood material, the measurement amount is 150-200 g.
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