Method and installation for the purification of synthetic gas by scrubbing ammonia and hydrogen using condensate

摘要

A method for producing synthesis gas is disclosed, wherein the method comprising the steps of: (a) gasifying a feedstock comprising biological substances to produce a synthesis gas comprising water, ammonia, and hydrogen sulfide; (b) cooling the gas; (c) conducting the cooled gas through the feedstock to filter the gas; (d) conducting the filtered gas through a condenser to separate the water from the gas; and (e) conducting the gas through a first scrubber and then a second scrubber, wherein in each scrubber, ammonia and/or hydrogen sulfide is washed out of the gas using condensate obtained directly or indirectly from the gas. Also disclosed is a system for the production of synthesis gas, wherein the system comprises: a storage tank, in which a feedstock comprising biological substances is held; a gasifier, in which the feedstock is gasified to produce synthesis gas; a cooler, in which the synthesis gas is cooled; a filtering stage, in which the cooled synthesis gas is filtered through the feedstock; a condenser, in which water is separated from the synthesis gas; a first scrubber, in which the filtered gas is washed using condensate, obtained directly or indirectly from the gas, to remove ammonia and/or hydrogen sulfide from the gas; and a second scrubber, in which remaining ammonia or hydrogen sulfide is washed from the gas.