Patent ID: 9138708
Filing Date: 2015-09-22
Classification: B01J,C10J,C10K,Y02E

Abstract:
1. A method, comprising: monitoring a pressure of a gasification system after gasifier shutdown via a pressure sensor, wherein the gasification system comprises a gas treatment system and a gasifier configured to output syngas to the gas treatment system during gasification; depressurizing the gasification system after gasifier shutdown by opening a flare valve to release gas from the gasifier and the gas treatment system to an atmosphere; and pressurizing the gasification system after gasifier shutdown, when the monitored pressure reaches a lower pressure threshold, by establishing multiple purge flows of inert gas into the gasification system to remove residual gas from the gasification system; wherein the multiple purge flows are established at different times and at different locations within the gasification system relative to each other, wherein establishing multiple purge flows comprises: establishing a first flow of the inert gas at a syngas cooler of the gasification system; and establishing a second flow of the inert gas at a location between the syngas cooler and the gas treatment system.