Partial oxidn. of carbonaceous fuels with increased carbon conversion - by sepn. of particulates from quench water and recycling the high carbon content portion

摘要

A process is claimed for the partial oxidation, in the fly ash mode, of solid, ash-contg. carbonaceous fuels, where an aq. suspension of particulates is obtained by passing the product gas, contg. low-C ash particles and high-C unconverted fuel particles, from the partial oxidation zone through a water-contg. quench chamber. The improvement comprises (a) screening the suspension to remove large particles, (b) sepg. the screened suspension in a continuous centrifuge operating at 10-1000 G into (i) a high-C cake and (ii) a dilute aq. suspension contg. low-C particles, and (c) recycling the high-C cake with fresh feed to the partial oxidation zone. High overall C conversion is obtained and the amt. of waste material to be disposed of is minimised.