A composite structure with a heat pipe and foamed iron-nickel composite fire suppression is proposed on the basis of the phase-change heat transfer of the heat pipe, which simultaneously attenuates the metal foam explosion energy. A numerical simulation is conducted to evaluate the feasibility of the designed construction for suppressing explosions under various thicknesses and pore diameters of the metal foam. The results demonstrate that when the foam iron-nickel metal is installed in the pipeline, the temperature reduction rate in the pipeline can reach 8.9%. The new heat pipe foam composite structure can reduce the flame temperature to 1600 K within 0.095 s. It is concluded that the heat pipe composite metal foam structure pipeline has a strong effect on suppressing combustion and explosion overpressure. Due to the combined effect of the heat pipe vacuum chamber suction energy and the foamed iron-nickel, the flame temperature decay rate increases. The maximum attenuation rate of the foamed iron-nickel for the gas explosion shock wave reaches 41.76%, and the maximum flame temperature attenuation rate reaches 64.7%. The composite heat pipe structure can quickly disperse and transfer heat, thereby effectively destroying the heat storage environment as soon as possible to prevent a secondary explosion from occurring.
Coal spontaneous combustion is one of the major disasters in coal storage and coal transportation. Consequently, coal fire prevention and control technology is one of great significance to the safe operation of coal mines. Heat pipe is a passive heat transfer device by phase change method. Thermal energy can be transported from the underground to the surface continuously by the heat pipe effect, so that it is expected to diffuse concentrated heat and reduce the temperature of the coal pile, which is effective for preventing coal spontaneous combustion. The experiment removing thermal energy from the underground coal is carried out in order to identify the feasibility of the heat pipe heat extraction heat from the coal dump. The results out of the present experimental conditions were shown that the application of heat pipes are contributing to extinguishing coal fire as well as for energy recovery utilization purpose.
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