Comparative Study on Pyrolysis Characteristics of Lignite Binderless Briquette and Raw Coal

The article studies the pyrolytic properties of the binderless hot-briquetted lignite in East Mongolia during the process of middle-temperature and low-temperature pyrolysis, mainly on the law of semi-coke characteristics and the tar extracts, pyrolysis water, gas velocity, gas contents at different temperature, meanwhile compared the pyrolysis characteristics of the raw coal and briquette. The research shows that as the temperature increasing, the semi-coke yield obtained by pyrolysis of lignite briquette is nearly 6% higher than raw coal, Tar releasing is approximately equal to raw coal, the pyrolysis water yield of raw coal is about13.85% higher than the briquette, the gas yield of briquette is about 7% higher than raw coal, gas velocity of briquette is higher than raw coal, calorific value of briquette gas is about 3 MJ/Nm3 higher than raw coal, gas composition rules are approximately equal, and both with a high content of CO and H2, and as well as suitable for synthesis gas. The main process of binderless briquetting is to remove moisture from coal samples. It relatively makes gas releasing process and water-oil separation more easily and makes the gas calorific value improved.