Name : [in Japanese]
Location : [in Japanese]
Date : October 31, 2023 - November 01, 2023
Pages 4-5
Substituting air with either CO2 or H2O in the gasifying agents presents a viable strategy for promptly integrating a carbon-neutral energy vector into coal gasification technology, concurrently mitigating harmful particulate matter emissions. However, fully understanding the evolution of tar in the practical gasifier has proven to be challenging owing to complex mixture of the scale of reactors. This study presents a detailed kinetic investigation of tar and soot formations from the gas-phase reactions in the reductor of a two-stage entrained flow coal gasifier under oxy-fuel (O2/CO2, O2/H2O) atmospheres. The effects of temperature and coal types were studied. The results show that benzene, followed by naphthalene and phenanthrene, serves as the primary tar products. Higher temperature promotes tar reduction, especially under O2/H2O condition. Moreover, soot yield under the O2/H2O condition is less than that under the O2/CO2 condition owing to weaker hydrogen abstraction acetylene addition route. Soot yield decreases with the temperature rises. This work provides valuable insights and guidance for the reduction of tar and soot in the two-stage entrained flow coal gasifier under oxy-fuel atmospheres.
