Thermodynamic Study on Catalytic Reforming Process of Pyrochar from CaO Conditioned Sludge
The production of hydrogen-rich syngas by pyrolysis is an important means to realize the high value resource utilization of sludge.Reforming the volatiles of sludge pyrolysis by using Cao-conditioned sludge pyrochar can further improve the yield of syngas and hydrogen.In this paper,based on the Gibbs free energy minimization principle,the REDOX behavior of volatile and sludge semi-coke in reforming process was simulated.The effects of temperature and CaO addition on the composition of syngas and the occurrence of iron and calcium compounds in sludge pyrochar were investigated.The results show that there are certain Fe-S compounds and lower iron oxides in the unconditioned sludge pyrolysis semi-coke,due to the strong sulfur and phosphorus fixation of Ca and the metal synergistic effect between Ca/Fe.The addition of CaO can promote the conversion of iron elements in pyrochar to high-valence iron oxides,thus improving the catalytic activity of pyrochar.The modified pyrochar can effectively realize the reforming of volatiles at 700℃to 900℃,so that the component content of H2 and CO in the syngas can reach nearly 90%,so as to obtain high quality syngas.
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