Abstract
The influence and control of time and temperature on coalification are comprehensive. In order to quantitatively analyze the thermal kinetics of coal metamorphosis process by temperature and time, the qualitative analysis of coal metamorphosis thermodynamic equation (CMTE) based on Wu Chonglong was further verified from the mathematical point of view. Wu Chong Long's Coal Metamorphism Thermodynamics Equation (CMTE) is a ternary equation containing coal forming period or metamorphic age (time), metamorphic temperature (temperature) and metamorphic degree (reflectivity). The temperature calculated by fixing time and reflectivity is the lowest theoretical metamorphic temperature. The reflectivity calculated by fixing time and temperature is the maximum theoretical metamorphic degree. The “time-temperature ratio” is defined as the equivalent of extending million years to increasing 1°C temperature regarding coal metamorphism. This ratio is used to compare the impact of extending time or increasing temperature on improving the metamorphic degree and its significance. The results showed that in the same coal forming period, the ratio is decreased with the reflectivity increasing; at the same reflectivity, the ratio decreased with younger coal forming period. At R<sub>o</sub>=6.1%, the calculated ratio is 3.67, which means, at R<sub>o</sub>=6.1%, increasing 1°C is equaled extending 3.67 million.
Highlights
The developmental process from peat to lignite, to subbituminous coal, bituminous coal, until to anthracite, is called “Coalification” or “metamorphism”
Even if the influence and control of metamorphism are comprehensive, but the degree is mainly controlled by two external influence factors, and the metamorphism degree is indicated by the reflectivity [1, 2]
The Coal Metamorphic Thermodynamics Equation (CMTE) is rarely used to verify the qualitative analysis of coal metamorphic thermal dynamics
Summary
The developmental process from peat to lignite, to subbituminous coal, bituminous coal, until to anthracite, is called “Coalification” or “metamorphism”. Wu Chong Long and Yang Qi, according to the general principle of thermal and chemical dynamics, referring to the Bostick curve and the measured data in China, use the dual regression method have established a three-variable empirical formula of temperature -time -reflectivity [3,4,5,6] Coal Metamorphic Thermodynamics Equation (CMTE). The CMTE is rarely used to verify the qualitative analysis of coal metamorphic thermal dynamics. To this end, this article tries to solve the following three problems: calculating the minimum metamorphic temperature for coal with known absolute age and reflectance; calculating the maximum reflectance for coal with known absolute age and reflectance; and quantitatively explaining which of the two factors, temperature rise and time extension, has a greater influence on improving coal metamorphism. Zhang Xuemei et al.: Inter-influence of Temperature-time-reflectivity in the Coal
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