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HAZARDOUS GAS DETECTING METHOD APPLIED IN COAL MINE DETECTION ROBOT



ABSTRACT
As one of the largest coal production and consumption countries in the world, China is also one of the related accidents occurred frequently countries such as gas explosion, flood, breaking out of fire during the exploitation of coal mine.
Coal Mine Detection Robot can be substituted or partial substituted for emergency workers to enter the mine shaft disaster site and detect hazardous gas and do some environmental exploration and surveying task. Coal Mine Detection Robot uses infra-red spectrum absorption way to detect methane, carbon monoxide and such gas simultaneously.
The principle of gas survey meter of infra-red spectrum is according to the selectively absorption of infrared radiation by the mash gas, CO to achieve the detection of their concentration. The advantages of this kind of hazardous gas detecting are: simultaneously and rapidly detecting methane, CO and high sensitivity, good selectivity and fast response.
Otherwise, it is easy to be taken by robot due to its simple and light structure, have a lager detection range and probe is not easy failure to be poisoning and aging.

Hazardous Gas Detecting Method Applied in Coal Mine Detection Robot

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Abstract

As one of the largest coal production and
consumption countries in the world, China is also one of the
related accidents occurred frequently countries such as gas
explosion, flood, breaking out of fire during the exploitation of
coal mine. Coal Mine Detection Robot can be substituted or
partial substituted for emergency workers to enter the mine
shaft disaster site and detect hazardous gas and do some
environmental exploration and surveying task. Coal Mine
Detection Robot uses infra-red spectrum absorption way to
detect methane, carbon monoxide and such gas
simultaneously. The principle of gas surveymeter of infra-red
spectrum is according to the selectively absorption of infrared
radiation by the mash gas, CO to achieve the detection of their
concentration. The advantages of this kind of hazardous gas
detecting are: simultaneously and rapidly detecting methane,
CO and high sensitivity, good selectivity and fast response.
Otherwise, it is easy to be taken by robot due to its simple and
light structure, have a lager detection range and probe is not
easy failure to be poisoning and aging.

INTRODUCTION

China is one of the largest coal production and
consumption countries in the world, among its energy
industry, coal accounting for about 70% in production and
consumption structure of primary energy sources, and by
2050 its expect to accounting for more than 50%. For the
poor geological conditions of the coal bed of China , there
are so many highly gassy mine that accident occurred
frequently such as fire damp explosion, water burst, breaking
out of fire during the exploitation of coal mine. Therefore,
how to accurately detect and prospect the incipient accident
before it happens and how to rescue in maximum possibility
after it happens is the most important thing. At recent times,
there is little research about Coal Mine Detection Robot,
only a little research on rescue robots for surface buildings'
collapse and fire-fighting robot, and these robots are not
suitable for detecting coal mine accident [1]. The research of
Coal Mine Detection Robot (figure 1) can make the coal
mine rescue works improving a lot, and reduce the casualties
caused by mine accident. It will be substituted or partial
substituted for emergency workers to enter the worksite and
to carry out environmental prospecting and surveying task.
As the requirement of limited size and load for the robot in
special circumstances, and many items to detect, the research
of detecting by coal mine underground explorative robot
have great practical significance and advanced natures.

PRINCIPLE OF THE GAS DETECTION

The detection methods of mash gas in the underground
of coal mine shaft mainly have optical interference way,
thermal conductivity way, semiconductor air-sensitive way,
electrochemistry way, isotopic carrier catalytic combustion
way, infra-red spectrum absorption way. The detection
methods of carbon monoxide gas in the underground of coal
mine shaft mainly have solid state sensor, electrochemistry
sensor , isotopic carrier catalytic combustion way, infra-red
spectrum way. The principle of carbon monoxide gas
detection is just like the principle of the last four ways of
mash gas detection.
Optical interference way is using spectral interferometric
principle to detect gas. Thermal conductivity way is using
thermal conductivity gas-Sensing material for the thermal
conductivity of gas and air, and realizes the difference of gas
detection. Semiconductor air-sensitive way is using some
metal oxide in heating conditions (600 degrees Celsius) the
thin-film resistors with the concentration of gas detection
contact and the characteristics of the gas detection.
Electrochemistry way is using the diaphragm spreading the
sorbent electrolyte measured by electrolysis gas. Carrier
catalytic combustion type of detector is using sensitive
elements of gas, gas in catalytic effect on surface, without
flame combustion heat release, concentration of gas
detection.

HARDWARE DESIGN OF THE GAS DETECTION

The underground coal mine shaft detector uses infrared
detector detecting the nocturnal radiation. The infrared
detector contains photo-thermal detector and photon detector.
According to the special environment of the coal mine
shaft the detection system uses pyroelectricity detector,
which has advantage of wide response wave band to detect
methane, CO and such gas at the same time, and no need
refrigeration, simple and light structure is easy to be taken,
and suitable to work underground the shaft.

can anyone tell the materials needed and cost of making a miniature of hazardous gas detecting robot?

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