Dynamic measurement device and method for coal-oxygen composite reaction gaseous product component and coal weight

Abstract

The invention discloses a dynamic measurement device and method for a coal-oxygen composite reaction gaseous product component and coal weight. The device comprises an air inlet mechanism, a compoundreaction mechanism, a quantitative gas extraction mechanism and a chromatographic analyzer which are sequentially connected. The method comprises the following steps of: 1, filling coal samples; 2, heating coal samples ; 3, configuring a coal oxygen composite reactant gas; 4, heating the gas; 5, performing a coal oxygen composite reaction; 6, acquiring coal oxygen composite reaction data; 7, repeating the steps from step 1 to 6; 8, constructing a fitting function of the mass change value and the current change value; 9, and dynamically determining the coal-oxygen composite reaction gaseous product component and coal weight. The invention fully mixes all the experimental gases to meet various high requirements of experimental gas. The coal oxygen can be accurately reacted, the system erroris small, and the quantitative gas extraction mechanism is used to obtain the gaseous product components of the coal-oxygen composite reaction in each stage. The temperature, weight and gas componentswhich characterize the nature of the relatively slow chemical reaction process are reliably extracted, and the comprehensive measurement is performed.

Description

technical field [0001] The invention belongs to the technical field of coal-oxygen composite reaction, and in particular relates to a dynamic measuring device and method for gaseous product components and coal weight of coal-oxygen composite reaction. Background technique [0002] Once coal is mined and comes into contact with air, due to its activity, it will undergo a low-temperature oxidation reaction with oxygen in the air, and when the conditions are right, it will spontaneously heat up and eventually spontaneously ignite. These fire damage phenomena not only lead to the loss of its available calorific value, but also bring serious safety problems to the mining, processing and utilization of coal. [0003] Because of the differences in chemical composition, physical structure, and degree of weathering of different coal bodies, coal exhibits different characteristics in self-heating and subsequent spontaneous combustion phenomena. In view of this, many methods have been...

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Problems solved by technology

Among them, the amount of oxygen absorbed by the sample measured by the "oxygen adsorption" technique can usually be used as an indicator to determine the activity and self-heating tendency of the interaction between coal and oxygen. Another indicator derived from the "oxygen adsorption" technique is called the Graham ratio, or It is a CO index, which is mainly based on the amount of CO released during the oxidative spontaneous combustion of coal. These two methods have high requirements for gas, and the test index is single, which is likely to cause errors in the experimental system; the cross point temperature method is used to judge the coal The process of spontaneous combustion is mainly by comparing the temperature difference between the geometric center of the coal body and its vicinity. Although this method can directly see the temperature change, the judgment index is single, and it is impossible to monitor the changes of various gas components during the coal spontaneous combustion process, and it is also impossible Visualize the weight change during coal spontaneous combustion; adiabatic calorimetry is to determine the critical temperature of spontaneous combustion and the delay time of spontaneous combustion of a specific coal sample under specific conditions. laboratory use

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