Pilot-trial and modeling of a new type of pressurized entrained-flow pulverized coal gasification technology

A new type of pressurized entrained-flow pulverized coal gasification technology has been developed by ECUST. It is characterized with four nozzles symmetrically disposed on the upper part of a gasifier. The effects of operation conditions on gasification, N2 as carrier gas with middle pressure superheated (MP SH) steam, CO2 as carrier gas with MP SH steam and CO2 as carrier gas without MP SH steam, respectively, have been tested in the pilot plant. The carbon conversion of all gasification schemes is larger than 99%. For N2 as carrier gas, the volume fraction (Dry) of CO + H2 is larger than 90% (v). For CO2 as carrier gas, the volume fraction (Dry) of CO + H2 is larger than 92% (v) with MP SH steam and larger than 95% (v) without MP SH steam.At the same time, based on Gibbs energy minimization principle, the pulverized coal gasification system model was built. The simulation results well matched the pilot-trial data under different operation conditions. The model can be used for the design, assessment, and improvement of the entrained-flow coal gasification system.