Pyrolysis characteristics of two low rank and composition of the tar

• 1、Key Laboratory of Coal Science and Technology (Taiyuan University of Technology), Ministry of education and shanxi Province, Traning Base of State Key Laboratory of Coal Science and Technology Jointly Constructed by Shanxi Pronvince and Ministry of Science and Technology ,Taiyuan 030024

Abstract：In this paper, pyrolysis characteristics of Hulun Beir lignite and Shendong long flame coal were investigated by TG and flash pyrolysis on a fixed bed reactor with nitrogen as atmosphere. The composition of hexane-insoluble of tar were analyzed by gel permation chromatography and synchronous fluorescence spectroscopy with wavelengh diffrence of 14 nm. The results showed that the thermal weight loss and maximum weight loss rate of Hulun Beir are larger than Shendong, however, the initial pyrolysis temperature is lower. And char and tar yield of Shendong long flame coal was 77.1 wt% and 6.6 wt%, respectively. The yield of char and tar from Hulun Beir were lower than Shengdong, was 69.8 wt% and 5.2 wt%. The pyrolysis water and gas is as high as 9.9 wt% and 15.2 wt%, respectively. The molecular weight distribution of the hexane-insoluble of tar from two coals were between 4150 amu to 127 amu, was mainly composed of 4-5 rings aromatics.

Keywords： lignite long flame coal pyrolysis tar heavy component