Comparative Study on Microwave Co-pyrolysis Products of Low-Rank Coal under Circulating Gas and N_2 Atmosphere

摘要

Microwave pyrolysis is a new research method for deeply processing of low-rank coal. On basis of experiments, this paper conducted comparative study on microwave co-pyrolysis products of low-rank coal under circulating gas (CG) and N_2 atmosphere, respectively. The composition and content of tar and bluecoke were analyzed by gas chromatography-mass spectrometry and fourier transform infrared spectrometer. The results indicated that compared with N_2 atmosphere, the yield of liquid products (tar and pyrolysis water) obtained under CG atmosphere was higher than 8.0 wt.%, whereas the bluecoke yield was lower than 4.4 wt.%; The content of S element in the bluecoke obtained under CG atmosphere was 0.16 wt.% to meet Bluecoke Standard S-1 Grade, and the N element content was just 0.67 wt.%. Furthermore, the content of -OH、C=C and -C=O functional groups in the bluecoke were higher; The alkanes compounds content in tar obtained under CG atmosphere was 8.10 wt.% higher than that under N_2 atmosphere, meanwhile, the aromatic hydrocarbons compounds content was 37.4 wt.% lower than that under N_2 atmosphere.