A corresponding distribution of electric potential is produced in a porous medium like sand and an aggregation of broken rocks, if a temperature distribution exists in the medium. The authors performed model experiments to investigate whether the measurement of the electric potential distribution can be used for locating the heat source. The main parameters measured are electric potential and temperature. The results of the experiments show that a distribution of electric potential is always created corresponding to the conditions of the heat source. It is concluded that there is a possibility that the measurement of potential distribution can be used for locating the heat source of spontaneous combustion of coal.
This paper discusses a new method for optimization of mine ventilation system. The method is based on criteria as follows: (1) minimize the size of each regulator; (2) minimize the number of regulators; and (3) minimize the total power consumption of fans. Based on this theory, the optimization problem of the ventilation system is classified as optimization of mine ventilation network and calculation of operating points of fans. Furthermore an algorithm that determines the economical operating point of fans while calculating the optimum controls of ventilation network is proposed. The main features of this method are that it does not require the analysis of a largescale nonlinear programming problem, and the optimal solution can be obtained by means of existing programs for mine ventilation network analysis.
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