The effective thermal conductivity (ETC) model of loose residual coal in goaf is a method to study the heat transfer law of spontaneous combustion in goaf. In order to study the effect of coal particle size and ambient temperature on heat transfer, coal samples of different sizes were taken from the FuSheng (FS) mine, and the void fraction, the thermal conductivity (TC) of the residual coal under different ambient temperature were tested. Additionally, four types of ETC models of loose residual coal in goaf were obtained and the average relative errors of the TC were analyzed. The results showed that the void fraction, the coal particle size and ambient temperature have different effects on the spontaneous combustion of the residual coal. The effect of coal sample size on the heat transfer is 100 times that of the ambient temperature. The changes in the ETC and average relative error of the different models were consistent. The heat transfer in the spontaneous combustion of residual coal has a direct relationship with the spatial distribution and heat transfer modes of the loose residual coal in the goaf.

采空区松散残煤有效热导率（ETC）模型是研究采空区自燃传热规律的一种方法。为研究煤粒度和环境温度对传热的影响，从富盛（FS）矿采集了不同粒度的煤样，研究了不同环境下剩余煤的空隙率、热导率（TC）。温度进行了测试。此外，还获得了采空区松散余煤的四种ETC模型，并分析了TC的平均相对误差。结果表明，孔隙率、煤粒度和环境温度对剩余煤自燃的影响不同。煤样尺寸对传热的影响是环境温度的100倍。不同模型的ETC和平均相对误差的变化是一致的。余煤自燃过程中的传热与采空区松散余煤的空间分布和传热方式有直接关系。