Patent ID: 8268266

Claim:
A system, comprising: a gas processing section, comprising: a gas path; a first shift reactor disposed along the gas path, wherein the first shift reactor is configured to perform a first shift reaction to produce a first shifted gas; a second shift reactor disposed along the gas path downstream from the first shift reactor, wherein the second shift reactor is configured to perform a second shift reaction to produce a second shifted gas; a first steam generator disposed along the gas path between the first and second shift reactors, wherein the first steam generator is configured to transfer heat away from the gas path to generate a first steam; a first gas cooling section having a first exchanger disposed along the gas path upstream from the first shift reactor; a second gas cooling section having a second heat exchanger disposed along the gas path downstream from the second shift reactor; and an acid gas removal (AGR) section disposed along the gas path between the first gas cooling section and the first shift reactor; wherein the gas path comprises a first portion passing through the first heat exchanger upstream from the AGR section and a second portion passing through the first heat exchanger downstream from the AGR section, and the first heat exchanger is configured to transfer heat from the first portion to the second portion; wherein the gas path comprises a third portion passing through the second heat exchanger downstream from the second shift reactor and the second portion passing through the second heat exchanger downstream from the first heat exchanger, and the second heat exchanger is configured to transfer heat from the third portion to the second portion.