A review on numerical solutions to self-heating of coal stockpile: Mechanism, theoretical basis, and variable study

摘要: Abstract Self-heating or even spontaneous combustion of stockpiled coal, which is likely to outbreak under favourable circumstances during its transport, process, and storage, a long-standing thermal dynamic hazard. This hazard harmful in diverse aspects: causing loss coal resource caking property, raising safety concerns upon occurrence open fire, giving off noxious/greenhouse effect gases. Due the complexity involved physical process (e.g. heat mass transport) chemical oxidation), formulating an analytical solution problem with without transient approach would be daunting task thus more often addressed numerically. So far many numerical models self-heating have been developed summarise these erratic findings, this work critically reviewed theses solutions since last four decades. Mechanism on low temperature oxidation especially kinetic modelling firstly investigated clarify processes. On basis mechanistic understanding, theoretical derivations progressive advances governing equations like energy, mass, momentum conservation are compiled details. Through parametric studies sensitivity check produced fruitful but slightly inconsistent findings. Therefore provide industry unbiased comprehensive guides, present examined influences various contributors including wind flow, stockpile dimensions, particle size, moisture content, packing porosity behaviour coal. Last not least, major challenges perspectives subject may briefly discussed.