The class of coal that has the highest heating value is anthracite. Anthracite is a type of coal that is known for its high carbon content, typically ranging from 86% to 97%. This high carbon content results in a higher energy density compared to other types of coal.
Anthracite coal burns cleaner and produces a higher temperature when ignited, making it an efficient fuel source for heating and industrial applications. In addition to its superior heating value, anthracite also has a low volatile matter content, which contributes to its minimal emissions when burned.
In comparison, other classes of coal, such as bituminous, sub-bituminous, and lignite, generally contain lower carbon percentages and higher moisture and volatile material content, resulting in lower heating values. Therefore, if you’re looking for coal with the highest heating value for energy production or heating purposes, anthracite is the optimal choice.