Gasification of solid carbonaceous fuels - slurried in liquid carbon dioxide, by continuous partial oxidation

摘要

Synthesis or fuel gas mixts. (constituents CO, CO2, H2, H2O, CH4, H2S, COS, N2, A) are produced by (a) mixing liquid CO2 and a solid particulate carbonaceous fuel at between -69 and +80 degrees F and at a pressure between above the triple point pressure of the CO2 and 1000 psig to produce an H2O-free slurry, (b) introducing the slurry at between-69 and + 1200 degrees F and at 76-4500 psia simultaneously with an O2-contg. (21 mole % O2) gas at 80-500 degrees F and 76-4500 psia into a free-flow noncatalytic gas generator and (c) carrying out partial oxidation of the mixt. at an autogenous temp. of 1200-3000 degrees F and 30-4400 psia. The liquid CO2 serves both as slurrying agent and temp. moderator. The process utilises low cost high-sulphur solid fuel feeds, reduces heat load and consequently oxygen requirements of the gas generator, eliminates heat exchanger fouling, avoids excessive duty and temp. degradation of recoverable heat when using a waste heat boiler, and reduces single-pass carbon waste.