GB1378023A - Gasification process - Google Patents

Abstract

1378023 Water gas; cooking EXXON RESEARCH & ENG CO 12 Jan 1972 [22 Jan 1971] 1448/72 Heading C5E Fuel gas is made from coke in a reactor which comprises a single vessel (110) divided into three zones (111, 112, and 113), by a process comprising (a) introducing heated coke from step (d) into a fluidized gasifying bed at 1600‹ to 2200‹ F. in the lower zone (112) to contact steam and an oxygen-containing gas; (b) passing the resulting hot gas to the intermediate zone (111); (c) introducing cool coke into this zone to heat the coke to at least 1050‹ F. and cool the gas at least to 1800‹ F., the gas velocity being high enough to lift the coke to the upper zone (113); (d) passing the cooled gas and heated coke to the upper zone and there disengaging them; and (e) recovering the cooled gas from the disengaging zone. As shown, a petroleum residuum is coked in the coker 101, and the resulting coke is removed by line 107 and transferred to the reactor 110 by steam introduced at 108. Air or oxygen may be injected at 109 to control the temperature. The coke is carried upwards through the zone 111 and heated by hot gases from the lower zone 112. It is disengaged from the gas by baffles 114 and cyclones 115, and part of it, controlled by a slide valve 119, passes into the gasifying zone 112. Here it is gasified by contact with air or oxygen from line 123 and steam from line 124. The resulting hot gas passes up through the zone 111, where it is cooled, and out through the cyclones 115. Line 120 controls the level of the fluidized bed in zone 112, by taking off any excess coke for recirculation. Another part of the hot coke in the zone 113 is taken off by the line 117, where steam is injected from line 118 to convey it back to the coker, where it supplies the heat needed for coking.