Analysis of Products by Conventional and Microwave Induced Pyrolysis for Low Rank Coal

Abstract

This paper describes the products characteristic derived from the conventional pyrolysis (CP) and microwave-assisted pyrolysis (MWP) of low metamorphic coal. GC/MS were used to analyze the volatile fractions of tar obtained by pyrolysis at different temperature and microwave power. It was found that microwave treatment produces more gas and oil than conventional pyrolysis at 800w and 800°C. In addition, the gas from the microwave has much higher syngas (H2+ CO) contents (up to 55 vol. %) than those obtained by conventional hydrolysis (up to 42 vol. %). The tar from the microwave is mainly composed of aromatic pyrolysis and phenolic compounds, and the content is 47.398% and 13.831% respectively as the microwave power is 800w. Meanwhile, the tar component content of C5-C10from microwave pyrolysis is up to 5 fold than conventional pyrolysis. By contrast, the microwave-assisted pyrolysis is beneficial to the tar conversion to light fraction.