which may alone application too, through input the concentration information of CO, etc, to assess hazard of the spontaneous ignition and seek the optimum scheme of prevention and extinguishments for fire, etc.
On the basis of water simulation experiment and trace developing-out experiment, the paper studies comparatively the different effect of the ascensional ventilation and descentional ventilation system of the steep coal-seam pseudo-slope soft shield support workig-face on the spontaneous ignition in the gob and draws to some conclusions: the descentional ventilation system is most favourable for the prevention of spontaneous ignition in the worked-out area of the pseudo slope soft shield support working-face.
Using xk-1 test table of coal natural ignition at low temperature, the paper has studied the property of spontaneous combustiou in 6~(-2) coal seam of Dongxia Coal mine and obtained the concerned parameters of natural ignition in this coal seam.
Considering the division of stope forms,the law of natural ignition corresponding to it and the feature of CO dispersion and other corresponding fire position and combinig the finite element method of fire air diffusion equation,the author in this paper set up the expert system of natural ignition position judgement,and its error smaller than 10 meters.
This paper performed the theoretic analysis of the chemical reaction properties and thermal effects of coal-oxygen in the process of natural ignition in combustible coal seams and gave out the critical conditions of self-combustion of coal seam.
The prevention and control of coal natural fire in overlength fully mechanised coal mining working faces has upper societal and economical benefits in preventing the natural fire and insuring the workers' safety.
According to the actual conditions, choose the proper index gas. And KJ-XL beam tube observation system is developed. The natural fire nonage forecast technique system composed of infrared detection, beam tube observation and coal temperature auto-observation scope, realizes the nonage forecast to the No4326 over length fully mechanised mining working face successfully, and reduces the fireproofing scope.
The paper determines coal spontaneous combustion characteristic parameters by means of simulating experiment of coal low temperature spontaneous combustion ,calculates coal natural fire time, critical temperature, gas producing rate , exothermicity and limit parameters.
By the analysis of potential fire condition of T1491 face,we find that the low temperatore oxidation system leak out and so on are the causes of coal seam oxidation,we use the overall harness measure such as the adjusting the ventilation system of the working area,using the obstructer to prevent fire,using quniting to stop leaking, even the pressure to prevent or wring out the fire to diminish the occurrence of natural fire accident to insure the safe production of pits.
Analysis is made of the conditions of spontaneous ignition of hydrogen as a result of emergence of a starting shock wave in air before an expanding cold flow of gas.
The calculations of spontaneous ignition of hydrogen jet are based on a model which takes into account the gasdynamic transport of viscous gas, the kinetics of oxidation of hydrogen, multicomponent diffusion, and thermal conductivity.
In this study, the sensitivity of the Century model was assessed in regards to uncertainties for soil texture, natural fire return periods, grazing intensities, and climate.
Two-thirds of interior Alaska has an essentially natural fire regime, with few human ignitions, negligible suppression activity, and many large lightning-caused fires.
At the New Pit № 1 of Hokang Colliery during these years, satisfactory results have been obtained in adopting precautionary mud-flushing technique to prevent sponta-neous combustion in working extra-thick seams by slice mining with complete caving of roof.This article was written on the basis of the author's experience at this pit. Stress is laid upon the method of mud-flushing, certain technical problems on flushing, condi-tion of mud distribution in caving area and the comparison with hydraulic sand stow-...
It is found from oxidation tests of different coals at low temperature that the amount of CO released at a temperature of 100鈩?is greatest from lignite,while that from bituminous coal is next, and from anthracite is least. The higher the content of volatile matter and water, the larger is the amount of CO released from oxidation of coal. Tests made on inhibitors indicate that many chlorides of alkaliearth metals possess good inhibiting properties to oxidation of lignite and bituminous coals. Among them ZnCl...
To estimate the position of spontaneous combustion,first of all it is necessaryto describe the air flow and concentration of toxic gas in workings(including goaf)by adequate mathematic model.Repeated correction of the selected mathematicmodel on the basis of data obtained from routine operation and observation data,so that the model becomes a reproduction of air flow and concentration of toxicgas.As soon as spontaneous ignition takes place in the goaf,measure the relevantparameters——the spontaneous ignition...
自然发火
spontaneous combustion
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