Self-ignition fatalness decision method of coal

Abstract

The invention belongs to a spontaneous combustion easiness judgment method of coal, in particular to a spontaneous combustion danger judgment method of the coal. The method includes the following steps: 1. sampling: a coal sample is collected on a coal working face, sealed and then taken back to a laboratory; the coal sample is ground to be below 50 mesh in the laboratory and put into a dry and clean jar which is labeled; the label will indicate the sampling place and the coal sample preparation time; the jar is sealed by a rubber sleeve; 2. testing: an experiment is taken by a thermogravimetric analyzer; during the experiment, temperature control and data collection are completed by the thermogravimetric analyzer; 3. operation and calculation: calculation of the reaction activation energy is according to an Arrhenius equation; the judgment method is to judge the spontaneous combustion easiness of the coal by the ''ignition activation energy'' in oxidation spontaneous combustion reaction between the coal and the oxygen, without need of a lot of equipments and instruments; the analysis and judgment can be conducted only by one thermogravimetric analyzer; the judging reliability is high.

Description

technical field [0001] The invention belongs to a method for judging the difficulty of spontaneous combustion of coal, in particular to a method for judging the danger of spontaneous combustion of coal. Background technique [0002] In the production process of coal mines, spontaneous combustion accidents occur from time to time. The spontaneous combustion of coal not only burns precious resources, but also produces a large amount of CO, CO 2 and SO 2 Toxic and harmful gases, such as toxic and harmful gases, endanger the health and life of workers, pollute the environment, and can also induce the occurrence of gas and coal dust explosion accidents. The mechanism of spontaneous combustion and the effective prevention and control of spontaneous combustion of coal have very important theoretical and practical significance; for the classification and management of mine fires and early prediction and forecast, control and reduce the occurrence of major vicious accidents such as ...

AI Technical Summary

Problems solved by technology

[0003] Through the above analysis, it can be seen that the identification method of coal spontaneous combustion tendency based on the amount of oxygen absorbed by coal mainly reflects the physical adsorption characteristics of oxygen on the coal surface, but does not reflect the inherent oxidation kinetics of coal spontaneous combustion. Inconsistent situations; the various test methods currently used in foreign countries are mainly based on the test of thermal parameters, such as the minimum self-heating temperature (SHT), heat release rate (HR), coal self-heating temperature rise rate (R 70 ) cross point temperature (CPT) and activation energy (E) calculation based on high temperature, etc.; in the test of thermal parameters, the method of adiabatic experimental furnace is adopted, because the initial stage of coal oxidation at low temperature (below 60 ° C ~ 80 ° C) The heat production is small, the natural heating process is long, and the test conditions are very harsh, so it is difficult to form a test standard; the intersection point test method of programmed temperature and the activation energy calculation method based on high temperature mainly reflect the oxidation of coal under high temperature conditions. and spontaneous combustion characteristics, the actual significance of the measurement results will be affected; at the same time, the reaction that occurs in the coal oxidation process is a composite reaction (that is, two or more elementary reactions), and the activation energy of non-elementary reactions only has the superficial Therefore, the activation energy cannot be directly measured, but can only be obtained through calculation. The reliability of the calculation method is affected when the mechanism of spontaneous combustion of coal is still unclear.

In summary, the existing identification methods of coal spontaneous combustion tendency both at home and abroad have great limitations.

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