Gasification of carbonaceous solids

Abstract

Abstract A CONTINUOUS PROCESS FOR THE GASIFICATION OF CARBONACEOUS SOLIDS, ESPECIALLY COAL, WHEREIN A SOLID, LOW-SULFUR FUEL AND METHANE RICH GAS COMPRISE PRINCIPAL PRODUCTS. THE PROCESS EMPLOYS TWO-STAGE GASIFICATION, EACH STAGE CHARACTERIZED BY SUPER-PRESSURE AND HIGH TEMPERATURES. IN STAGE 1, A LOW-SULFUR CHAR IS REACTED WITH OXYGEN AND SUPERHEATED STEAM AT AN ELEVATED TEMPERATURE AND PRESSURE TO PROVIDE A STAGE 1 PRODUCT GAS COMPRISING OXIDES OF CARBON AND HYDROGEN. IN STAGE 2 A CHARGE COMPRISING A CARBONACEOUS SOLID, SUCH AS COAL, IS HEATED AND REACTED UNDER METHANE FORMATION WITH STAGE 1 PRODUCT GAS AND SUPERHEATED STEAM TO PROVIDE A STAGE 2 PRODUCT GAS AND CHAR WHICH ARE THEREAFTER QUENCHED AND SEPARATED FOR PROVIDING GASEOUS AND LOW-SULFUR SOLID CHAR PRODUCTS. A PART OF THE SOLID CHAR PRODUCT IS WITHDRAWN FROM THE PROCESS FOR PROVIDING A LOW-SULFUR FUEL FOR A BOILER FUEL AND THE REMAINING PART IS RECYCLED TO STAGE 1 AND THERE REACTED WITH OXYGEN AND SUPERHEATED STEAM FOR PROVIDING ADDITIONAL STAGE 1 PRODUCT GASES. THE WITHDRAWN CHAR PRODUCT IS BURNED IN A BOILER FOR PROVIDING PROCESS STEAM AND THE GASEOUS STAGE 2 PRODUCT IS FURTHER TREATED FOR PROVIDING METHANE-RICH FUEL GAS AND SULFUROUS BY-PRODUCT.

Inventors

• 👤 E Donath

Bibliographic Details