Patent ID: 8420031

Claim:
A system, comprising: a substitute natural gas (SNG) production system, comprising: a gasifier configured to generate syngas; a radiant syngas cooler (RSC) configured to cool the syngas through transfer of heat between the syngas and a fluid in a flow path, wherein the RSC has a length of between approximately 70 feet and approximately 100 feet; and a methanation unit configured to generate SNG from the syngas wherein the fluid flow path exits from the RSC and passes through the methanation unit, wherein generated pressure and a temperature of the fluid in the fluid flow path is based on an amount of heat to be transferred from the methanation unit to the fluid in the fluid flow path as the fluid passes through the methanation unit, wherein the fluid comprises water transmitted from a steam turbine along a second fluid flow path between the steam turbine and the RSC, wherein the methanation unit comprises a heat exchanger, wherein the methanation unit is disposed in the second fluid flow path between the steam turbine and the RSC.