Effect of pyrolysis upgrading temperature on steam gasification performance of Shengli lignite
The influence of different pyrolysis upgrading temperature on steam gasification performance of Shengli lignite was studied.Coal samples were pyrolyzed at 650℃,750℃,850℃,950℃,1 050℃,respectively.The FT-IR and Raman spectra were used to characterize the structure of coal char.The steam gasification performance of char was investigated in a fixed-bed reactor.The results showed that the ordering of char lattice and carbon matrix gradually increased,and active sites of char surface reduced during the high-temperature pyrolysis upgrading process,resulting in the decrease of steam gasification reactivity.Compared with Shengli lignite,the change of carbon crystallite structure during char pyrolysis had a greater influence on the reactivity of steam gasification.
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