Effect of Particle Size on Products from Flash Pyrolysis of Huolinhe Lignite in a Spouted-entrained Bed
喷动-载流床中粒径对内蒙霍林河褐煤快速热解产物的影响

The flash pyrolysis of Huolinhe lignite was carried out in a spouted-entrained bed when particle size was in the range of 0.125~0.280 mm. The present investigation focuses on the effect of particle size on pyrolysis product distribution and gas and liquid compositions. Gas and liquid products were analyzed by gas chromatography and GCMS. The results showed that the yields of gas products, CO, H2 and C1~C5 hydrocarbons, increased with increasing particle size. Coal devolatilization degree and liquid product yield decreased with increasing particle size. Among liquid products, the yield of asphaltenes decreased most notably, on the contrary, pyrolysis water increased. Yields of hexane solubles were not severely affected by particles size,and decreased slightly with increasing particle size. Compositions of liquid products were strongly dependent on coal particle size. Phenol and aliphatic fractions decreased with increasing particle size, but aromatic fraction increased, and polar and basic fraction increased first and then decreased.