Dynamic wind temperature control-based method for quickly testing shortest spontaneous combustion period of coal

Abstract

The invention relates to a dynamic wind temperature control-based method for quickly testing the shortest spontaneous combustion period of coal, which relates to a coal test method. The method comprises the following steps: (1) removing a surface layer of newly-collected coal, and then breaking the coal to obtain a test coal sample for later use; (2) adding the coal sample into a reaction container to allow wind flowing through coal bodies to pass through the reaction container uniformly, and opening a PID control system to monitor the temperature variation of the coal bodies and wind currents hourly; (3) opening an oxygen concentration detection system to detect the change rate of the oxygen concentration of each characteristic point in the coal bodies; and (4) substituting characteristic parameters determined in an experiment in the process of coal spontaneous combustion in a demarcated mathematical model of the shortest spontaneous combustion period of the coal to calculate the shortest spontaneous combustion period of the coal. The test method can determine the shortest spontaneous combustion period of the coal quickly, simply and accurately under the adiabatic condition and test the shortest spontaneous combustion period of the coal scientifically and quickly, and is high in confidence level of test results.

Description

technical field [0001] The invention relates to a coal testing method, in particular to a quick testing method for the shortest natural ignition period of coal by dynamically regulating the air temperature. Background technique [0002] The time from when the coal body comes into contact with air to when it begins to spontaneously ignite is called the spontaneous combustion period of coal. The prediction of the earliest spontaneous fire period is mainly based on experience and on-site statistics for preliminary estimation, usually in units of months, which cannot effectively guide on-site work. For this reason, various countries use spontaneous combustion test benches to simulate the process of coal spontaneous combustion, and further predict the period of coal spontaneous combustion, which provides basic data for coal mine on-site fire prevention and extinguishing work, and has achieved good results. [0003] The traditional coal low-temperature spontaneous combustion expe...

AI Technical Summary

Problems solved by technology

Since the spontaneous combustion period of coal is longer (tens of days to several months), the shortest is more than ten days, which is very uneconomical and infeasible from the perspective of research or test analysis.

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