Adiabatic spontaneous combustion triangle method for comprehensive evaluation and identification of coal spontaneous combustion risk

Abstract

The invention belongs to an adiabatic spontaneous combustion triangle method for comprehensive evaluation and identification of coal spontaneous combustion risk, which mainly includes the following steps: (1) using a small coal volume isothermal difference leading oxidation method to measure the leading spontaneous combustion ignition period, the coal sample volume is less than 200g, and the temperature is controlled Satisfied conditions: Furnace temperature = coal temperature + leading temperature difference; (2) Use the hyperbola fitting empirical formula method to determine the adiabatic spontaneous combustion ignition period; (3) Use the adiabatic spontaneous combustion triangle method to comprehensively evaluate the spontaneous combustion risk, spontaneous combustion tendency and ignition of coal Combustibility, using the adiabatic spontaneous combustion ignition period as the only indicator to identify the spontaneous combustion hazard level of coal. The technical problem to be solved by the present invention is to provide an adiabatic spontaneous combustion ignition period measurement technology that can use a small amount of coal to heat up from normal temperature, control the experimental cycle and ensure test repeatability, and construct an adiabatic spontaneous combustion triangle for comprehensive evaluation and identification The danger of spontaneous combustion of coal overcomes the disadvantages of one-sided emphasis on the tendency of spontaneous combustion at home and abroad.

Description

technical field [0001] The invention belongs to a method for comprehensively evaluating the risk of spontaneous combustion of coal, in particular to a method for comprehensively evaluating and identifying the risk of spontaneous combustion of coal by using an adiabatic spontaneous combustion triangle. Background technique [0002] At present, there is no clear definition of the spontaneous combustion risk of coal at home and abroad. The term "coal spontaneous combustion tendency" is usually used to emphasize the difficulty of coal self-heating at room temperature, and the statistical ignition period is used to roughly evaluate the spontaneous combustion risk of on-site coal. ; In fact, coal spontaneous combustion has a self-heating ignition difficulty, which has not been revealed. [0003] my country's national standard "GB / T 2004-2006" defines the spontaneous combustion tendency of coal as "the intrinsic property of coal's oxidation ability at room temperature", and uses "t...

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Problems solved by technology

The commonly used adiabatic oxidation method with a small amount of 100 grams of coal is used to measure the adiabatic spontaneous combustion period. Due to the small oxidation calorific value, it cannot be measured from room temperature; someone tried to use a large amount of coal of nearly ton level for adiabatic oxidation experiment, and the thermal inertia of the experimental device became accurate. The taboo of temperature control; moreover, no matter whether a small amount of coal or a large amount of coal is used for adiabatic oxidation experiment, because the adiabatic spontaneous combustion period of coal is usually more than tens of hours, even if the adiabatic spontaneous combustion period can be measured. There are practical problems that the experiment period is too long, the interference is aggravated, and it is difficult to repeat. The problem of measuring coal samples that are difficult to spontaneously combust is even greater.

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