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论文类型：期刊论文

发表时间：2021-02-02

发表刊物：JOURNAL OF HAZARDOUS MATERIALS

卷号：400

ISSN号：0304-3894

关键字：Thermal conductivity; Self-ignition potential; Heat transfer; Transient plane source method; Sensitivity analysis

摘要：The specific heat capacity (C-p), thermal conductivity (lambda), and thermal diffusion coefficient (D) of coal gangue (CG) are the main factors that affect the self-ignition potential for heat transferring from burning center to the ground surface. In this paper, the thermophysical properties of CG were investigated by transient plane source method. The correlations and sensitivity analysis were performed to characterize the degree of influence of the thermophysical parameters (C-p, lambda, and D) dependence on temperature. The mean values of C-p, lambda, and D for CG were at a range of 0.73-0.89 J g(-1) K-1, 0.44-0.76 W m(-1) K-1, and 0.26-0.43 mm(2) s(-1), respectively. Compared with coal, CG were located in the low area (S-c < 2) with higher value of lambda and D, but lower value of C-p. Results also showed that 70 degrees C was a critical point for CG at which some kinds of mutation took place in thermophysical properties. The comparison between the experimental data and the correlation outputs exhibited consistency.