Spontaneous Combustion Tendency Research Articles

Effects of electrical resistance on the spontaneous combustion tendency of coal and the interaction matrix concept

Abstract There have been several developments in determining the spontaneous combustion liability of coal. Most of the methods of concern have purely been based on the internal properties of the coal itself. The relation between the crossing-point method and the electrical resistance of coal was examined here to outline the spontaneous combustion tendency of coal. The electrical resistance property of coal was looked into as a decision-making parameter of the interaction matrix concept for the final decision on the spontaneous combustion tendency.

A Research on the Spontaneous Combustion Tendency of Turkish Coals-Ilgin Lignite`s Case

A Research on the Spontaneous Combustion Tendency of Turkish Coals-Ilgin Lignite`s Case

A simple method for predicting the spontaneous combustion potential of sulphide ores at ambient temperature

Spontaneous combustion is one of the more serious problems in the mining of sulphide ore deposits. It is, therefore, very important to invent a reliable and simple method to estimate the oxidation potential of sulphide ores. In this paper, the coincidence of relevant factors (e.g. oxygen absorption quantity, weight increment, water-soluble iron ions and sulphate ion of sulphide ore samples in the oxidation process) were investigated both in theory and through experiment. Based on a large number of tests for two group samples of sulphide ores from two mines, some important conclusions were obtained. The results achieved by the investigation indicate that there is no general interpretation relative to the oxygen absorption and the formation products of sulphate ion and water-soluble iron ions during the oxidation process of sulphide ores at ambient temperature. However, the weight increment of the sulphide ore samples in the oxidation process at ambient temperature has a linear relationship with the quantity of oxygen absorption. Therefore, the simple and cheap weight-scaling method would appear to be suitable for predicting the oxygen absorption performance of sulphide ores at ambient temperature in place of the expensive and complicated chemical method used hitherto. Furthermore, combined with other items of breeding-fire test, the weight increment potential can also be used to predict the spontaneous combustion tendency of sulphide ores.

炭鉱における生産, 保安の中央監視制御システムの開発

Mitsubishi Minami Oyubari Colliery which is located in southern part of Ishikari coal field in Hokkaido started its development since October 1966, and achieved the initially aimed production of 900, 000 tops coking coal annually.In this area, there are many difficuties connected with complicated geological structures, great quantity of reserved methane gas and tendency of spontaneous combustion etc.In development we tried to effect to build a modern colliery, which produces coal with high efficiency and stability. Then we have developed “Centralized Supervisory and Control System” over the whole field of productive installations and the safety. Main parts of the system are installed in the control room of the mine office, while sensors and actuaters are distributed all over the underground as well as the surface.Main function of the room attended usually by two persons are as follows:(1) centralized supervision and control of main facilities…… the gas turbine power station, power substations, compressors, main fans, exhaust blowers, belt conveyers, coal preparation plant and so on(2) automatic measurement and centralized supervision of the safety…… the concentration of methane and carbon monoxide, temperature, quantity of air flow, short circuit of air flow by opening door, local fans, sprinkling pressure, fire alarm, etc(3) gathering and communicating various kind of information quickly and precisely by the inductive wireless systemThis system was almost completed in September 1970, and now the total number of items concerned amounts to 878, that is for control 185, for supervision 568, for measurement 125. This system has till now much contributed to rationalization and mine safety in the colliery. In the near future the production of this colliery will be creased to 1, 300, 000 tons annually.