SU1583627A1 - Method of locating fires in coal mines - Google Patents

Abstract

The invention relates to the mining industry. The goal is to increase the efficiency of the method by expanding the range of detectable temperatures of all types of underground fires. To do this, a ventilation stream entering the fire site is introduced in series with a range of finely divided substances with different decomposition temperatures in order to decrease the decomposition temperature from 1200 to 90 ° C. Samples are taken in the stream of gases emanating from the fire source sequentially after the introduction of each substance. According to the presence of the indicator gas released during the decomposition of the corresponding substance from the selected series, the temperature of the fire source is determined. The process is carried out until in the samples taken after the introduction of the next substance into the stream, the gas evolved during its decomposition will not be detected. This method can be used in both exogenous and endogenous fire. 1 il.

Description

The invention relates to methods for detecting both endogenous and exogenous underground fires and determining their degree of development and can be used in the mining industry.

The aim of the invention is to increase the efficiency of the method for detecting underground fires of all types by expanding the range of detectable temperatures.

The method is carried out as follows.

For the expected range of temperature in the fire, a number of finely dispersed substances are selected that have different decomposition temperatures and emit specific (indicator) gases during decomposition, which are usually absent in the atmosphere of the emergency area, for example chlorine, bromine, ammonia, etc.

When determining the temperature of the vent stream entering the fire, successively with a certain interval determined on the basis of specific conditions, substances of a selected series are introduced in order to decrease the decomposition temperature of each of them. After each injection of the fine flow of air into the fire source, the sample

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Sampling of gases in an outgoing ventilator fire extinguish the sample components. It will be carried out until in the samples that are given after being introduced into the alternate substance, the gas evolved during its burning will not be reduced. The temperature in the fire is in the range

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the temperature in the fire center, ° C;

the decomposition temperature of the substance, after introducing into the stream of which the indicator gas was detected in the samples, ° C:

The decomposition temperature of the weight entered into the last but one stream, C. The drawing shows a diagram of the method for detecting an underground fire.

The emergency area with the fire center 1 is isolated by explosion-proof bridges 2 and 3 installed in the workings, respectively, with incoming (-) and outgoing (---) jets. With the help of pipeline A, a closed loop ABCD is formed, in which, with the help of fan 3, a recirculation (° -) combustion gas is created. At the same time, some of the gases in the leakage (v) move through the goaf. Since the rate of movement of gases through the generated: space is significantly less than the speed of movement of the gas flow through the main workings of the closed circuit, the output to the production with the outgoing jet and mixed with the main recirculation flow, the gases change the gas composition of the latter. Therefore, the application of known methods for determining the temperature of a fire source under these conditions is impossible.

To estimate the temperature of the fire 1 by the proposed method, a fine substance, cerium chloride decomposed at 1200 ° C with chlorine release, is introduced into the recirculating flow through chlorine / sampling of gases from the recirculating flow and sample components are extracted. If chlorine is detected in the pro-bang, this will indicate

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The temperature in the fire is equal to or exceeds 1200 ° C. In the absence of chlorine in the samples, the following finely dispersed substance with a lower decomposition temperature, for example barium bromide with a decomposition temperature and release of bromine, is introduced into the recycle stream through the nozzle 6. If no bromine is detected in the samples, the following substance is introduced, for example, iridium chloride with a decomposition temperature of 773 ° C, etc. When starting, ammonium iodate with a decomposition temperature of 13 0 ° C and release of ammonia is not detected in the samples, and ammonia is already detected in the sample with the introduction of ammonium hydrogen phosphate. The decomposition temperature of ammonium hydrogen phosphate H5 & C, therefore, the temperature in the fire lies in the range of 1 5-150 C, i.e. FROM $ t 0 n: 150 ° C. Knowing the temperature of the fire, they plan measures to eliminate the accident.

Claims (1)

The proposed method is applicable to both exogenous and endogenous fires. The operability of the method is enhanced if the fire development stage is approximately known, in this case the number of substances introduced into the ventilation flow can be significantly reduced to determine the temperature in the fire source. Invention Formula A method for detecting fires in coal mines, including sampling a gas stream emanating from a fire source and determining the presence of an indicator substance in samples, which, in order to increase the efficiency of the method by expanding the range of detectable temperatures of all types of underground fires, the ventilation stream entering the fire center is introduced in series with a range of finely divided substances with different decomposition temperatures in order to decrease the decomposition temperature from 1200 to 90 ° C; b in the outgoing one is carried out successively after the introduction of each substance and the presence of tracer gas released during the decomposition of the corresponding substance from the specified series is established. The temperature of the site of fire.