| 摘要 |
Described herein are improvements relating to a gasification reaction vessel for converting carbonaceous feedstock to synthetic gas. The reaction vessel being of the type having a lower section with a grid for retaining a bed of fluidizable and heat-retaining particulate material. The improvements generally consisting of an upper section of the reaction vessel having an enlarged average internal cross-sectional area compared to the average internal cross-sectional area of the lower section so as to facilitate disengagement and removal of said synthetic gas from the bed of particulate material. Also described in an improved gasification process using an oxygen-enriched fluidization agent wherein the oxygen content is about 25 to 35%, preferably 30 - 40% oxygen based on volume. Also described are improved conditioning processes for the hot synthetic gas exiting the reaction vessel. The conditioning process provides a clean, cold synthetic gas ready for use in various applications such as a fuel for boiler, furnace, internal combustion engine, etc. The process improvements consisting of subjecting the synthetic gas to a sequential treatment in at least one cyclone to remove particulate material therefrom, followed by a treatment in at least one counter-current wet-scrubber tower to cool said gas and solubilize or entrain further pollutants, followed by a treatment in at least one venturi scrubber to remove further pollutants, followed by treatment in a at least one demister to remove residual liquid droplets. Optional additional conditioning treatments are also provided. Recycling steps are also described and are aimed at increasing energy efficiency and minimize emissions as well as by-product generation. |
