Patent ID: 7883556
Filing Date: 2011-02-08
Classification: C10J,C10K,Y02P

Abstract:
1. A method of manufacturing synthetic gas containing hydrogen and carbon monoxide using a dual fuel slagging gasifier, comprising the steps of: a) introducing an operational charge material through a top charging system of said gasifier, said charge material comprising particulate solid carbonaceous material, quartzite, and flux to form a body of said charge material descending and reacting in a central shaft of said gasifier; b) entraining, injecting, igniting and gasifying a finely divided solid carbonaceous material and natural gas with a pressurized oxygen gas and steam through entrained gasification chambers into a lower portion of said gasifier to form high temperature products of gasification and unburned finely divided carbonaceous material at a temperature sufficiently high to melt, liquefy and slag with the descending charge material to react with either oxygen or steam within the central shaft and to produce a high temperature ascending gas that ascends upwardly through said body of charged material; and c) injecting excess steam into said body of descending charged material at an elevated location above the level of entrained material injection, where the ascending gas has a temperature which is sufficient to sustain an endothermic reaction between said excess steam, ascending gas, and carbon in the carbonaceous material to form additional hydrogen, carbon monoxide, and with surplus steam, said surplus steam sufficient to progressively shift the ascending gas to form additional hydrogen and carbon dioxide while said operational charged material descending, heating and reacting provides controlled cooling of the ascending gas, in conjunction with the excess steam, to a temperature which is within a safe operating temperature of the top charging system, to form a high temperature synthesis gas, wherein the charge material has a slag volume sufficient to chemically combine in the central shaft with sulfur or sulfur gases released in the central shaft such that the high temperature synthesis gas is free of sulfur.