“Low Temperature Thermal Modification”Search All-EnPress Publisher LLC.

The modification experiment of Inner Mongolia Baiyinhua lignite by hot air at 200 ℃ for 1 h was carried out. The

structural changes of Baiyinhua lignite before and after thermal modification were analyzed by infrared spectrum. The

results show that the moisture and oxygen content in lignite are greatly reduced by thermal modification, and the carbon

content and calorific value are also increased to varying degrees. In the process of thermal modification, various

oxygen-containing functional groups in lignite are reduced in different degrees due to thermal decomposition. Thermal

modification also causes substitution reaction of aromatic hydrocarbons in lignite, CH₂ in aliphatic hydrocarbon

structure breaks, but hydroxyl group in lignite does not change significantly before and after thermal modification.