Simple method for determining total moisture of drilled coal sample

Abstract

The invention discloses a simple method for determining total moisture of a drilled coal sample. The method comprises the following steps of: 1, weighing a tray with a preset size; 2, dividing the drilled coal sample into two parts, putting one part into the tray to weigh the tray and the coal sample, and carrying out total moisture test on the other part; 3, placing the tray and the coal sample in a laboratory, enabling the coal sample to gradually lose water in an air state, and weighing the tray and the coal sample every other hour until the 24th hour; 4, calculating the water loss rate ofthe (i+1)-th hour; 5, drawing a water loss rate curve of the coal sample, and taking the water loss time as an abscissa and the water loss rate as an ordinate, determining the starting time when the water loss rate is less than 0.3 for continuous 5 hours as inflection point time, and determining the total moisture of the coal sample corresponding to the inflection point time as the total moistureof the drilled coal sample; and 6, determining the total moisture of the drilled coal sample. The method is simple and rapid; the reasonable total moisture of the drilled coal sample is determined, sothat efficient and accurate utilization of coal is facilitated.

Description

technical field [0001] The invention relates to the technical field of determining the total moisture content of a borehole coal sample, in particular to a simple method for determining the total moisture content of a borehole coal sample. Background technique [0002] The total moisture is an important indicator of coal. Due to the limitation of sampling conditions in the exploration stage, it is usually difficult to determine the total moisture of the coal sample. In order to prevent the frictional heat from damaging the drill bit or igniting the coal sample during the drilling process, it is usually necessary to drill while drilling. While spraying water to cool, this will cause the total moisture of the sample to be higher than the actual coal sample. In the early stage of power plant construction, some power plants need to use drilled samples as design coal and check coal because the coal mines have not been formally mined. The incompatibility between quality and boile...

AI Technical Summary

Problems solved by technology

In the early stage of power plant construction, some power plants need to use drilled samples as design coal and check coal because the coal mines have not been formally mined. The incompatibility between the quality and the boiler equipment and auxiliary equipment brings operational problems such as safety, economy, and environmental protection to the unit

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