In order to study the effect of torrefying on co-pyrolysis behavior,the co-pyrolysis experiments of elmwood(E),torrefied elmwood(ET250)at 250℃ and low-rank coal(L)were carried out by using thermogray-mass spectrometry(TG-MS)at different mass ratios(1∶1,1∶3,3∶1).TG results show that compared with E and ET250,the pyrolysis of L requires a higher temperature and a longer time.However,when biomass is co-pyrolyzated with low-rank coal,the temperature and time required for co-pyrolysis decrease with the increase of biomass mass ratio.During the co-pyrolysis process,the weight loss characteristics of E and L influence each other,while the weight loss characteristics of ET250 and L are basically the same,indicating that the quality of elm and low-rank coal after torrefying at 250℃ is similar.The results can provide reference for the subsequent design of pyrolysis equipment.
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