LOW ENERGY PROCESS FOR THE PRODUCTION OF AMMONIA OR METHANOL
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United States of America Patent
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Issued Date -
May 26, 2011
app pub date -
Jul 3, 2009
filing date -
Jul 22, 2008
priority date (Note) -
Abandoned
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Abstract
A process for utilizing synthesis gas heat for the generation of supercritical steam in a low energy ammonia or methanol plant is disclosed. The process involves a reforming or partial oxidation stage, at least one supercritical steam generator having a shell side and a tube side, at least one superheater, at least one back pressure turbine, at least one extraction and condensing turbine, and at least one boiler feedwater pump. The synthesized synthesis gas is sent to the shell side of the supercritical steam generator, and the supercritical steam generator is fed with pressurized feedwater. The feedwater flow is adjusted to maintain the steam temperature at the exit of the supercritical steam generator in the range of 375-500° C. The supercritical steam is generated in the supercritical steam generator at a pressure of 225-450 bar, the supercritical steam is further heated in a superheater to a temperature of 500-750° C., and the supercritical steam generated in the superheater is fed to a back pressure turbine.
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