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Coal is widely known as being most abundant fossil fuel, as well as being the most prevalent method to obtain energy in the world. Though coal combustion has been studied extensively for more than a century, there are still a number of unknown issues to be explored. Generally, coal combustion includes three main processes: devolatilisation, combustion of volatiles, and coal char combustion. This book presents and discusses topical data on coal combustion, such as: the mechanisms of coal devolatilisation and the influences of several heating conditions; combustion models for the NOx and coal ignition reactions as well as an oxy-fuel combustion system; and mineral transformation and ash deposit during coal combustion.