SYSTEMS AND METHODS FOR IMPROVED SULFUR RECOVERY FROM CLAUS PROCESS TAIL GAS

摘要

A system for reducing SO2 emissions comprises a hydrogenation reactor, a tail gas cooler, a contact condenser, a hydrolysis reactor, and an absorber. The hydrogenation reactor is configured to receive a Claus tail gas and convert at least a portion of SO2 in the Claus tail gas to H2S to produce a hydrogenated Claus tail gas stream. The hydrolysis reactor is configured to convert at least a portion of COS to H2S. The absorber comprises an amine-based solvent and is configured to absorb at least a portion of the H2S and recycle the H2S to the Claus plant.

主权项

1. A system for reducing SO2 emissions, the system comprising:
a hydrogenation reactor configured to receive a Claus tail gas, and convert at least a portion of SO2 in the Claus tail gas to H2S to produce a hydrogenated Claus tail gas stream, wherein the Claus tail gas comprises the SO2, COS, and water; a tail gas cooler fluidly connected to the hydrogenation reactor and configured to cool the hydrogenated Claus tail gas stream to produce a cooled hydrogenated tail gas; a contact condenser comprising an alkaline solution, wherein the contact condenser is configured to receive a first intermediate treated tail gas stream and produce a second intermediate treated tail gas stream; a hydrolysis reactor that is configured to receive a third intermediate treated tail gas stream, and convert at least a portion of COS in the third intermediate treated tail gas stream to H2S to produce a fourth intermediate treated tail gas stream; and an absorber comprising an amine-based solvent and configured to receive a fifth intermediate treated tail gas stream, wherein the tail gas cooler is interposed between the hydrogenation reactor and the hydrolysis reactor.