Polygeneration Production of Power and Fertilizer Through Emissions Capture

摘要

Method for the production of ammonia, and optionally urea, from a flue gas effluent from an oxygen-fired, process, wherein the production of ammonia and optionally urea includes a net power production. Also provided is a method to effect cooling in an oxygen-fired process with air separation unit exit gases utilizing either closed or open cooling loop cycles.

主权项

1. A method for the production of ammonia from exhaust flue gases of an oxygen-fired process, the method comprising the steps of:
supplying a hydrocarbon or carbonaceous feedstock and oxygen to an oxygen-fired process to produce an exhaust flue gas, said exhaust flue gas comprising carbon dioxide, carbon monoxide, and hydrogen; supplying the exhaust flue gas to a first reactor, said first reactor comprising a catalyst and being configured to convert at least a portion of the carbon monoxide to carbon dioxide and produce a modified exhaust flue gas; supplying the modified exhaust flue gas to a second reactor, said second reactor comprising a catalyst and being configured to convert any remaining carbon monoxide to carbon dioxide to produce a carbon dioxide-rich exhaust flue gas; supplying the carbon dioxide-rich exhaust flue gas from the second reactor to a first condenser to remove water and produce a gas stream comprising primarily hydrogen and carbon dioxide; supplying the gas stream comprising primarily hydrogen and carbon dioxide from the first condenser to a carbon dioxide stripper to produce a hydrogen stream and a high purity carbon dioxide stream, said carbon dioxide stripper being charged with a solvent suitable for extracting a carbon dioxide, and wherein the hydrogen stream comprises minor amounts of carbon monoxide and carbon dioxide; supplying the hydrogen stream to a third reactor, said third reactor comprising a catalyst and being configured for the production methane from the minor amounts of carbon monoxide and carbon dioxide present in the hydrogen stream, said third reactor producing a methane product stream and a high purity hydrogen stream; supplying the high purity hydrogen stream from the third reactor and nitrogen gas from an air separation unit to a fourth reactor, said fourth reactor comprising a catalyst and being configured to produce an ammonia product stream; supplying the high purity carbon dioxide stream from the carbon dioxide stripper and the ammonia from the fourth reactor to a fifth reactor, said fifth reactor being configured to produce a product stream comprising urea.