Process and device for the separation of foreign gases from a reducing useful gas by steam-driven pressure swing adsorption
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United States of America Patent
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Jan 29, 2013
Grant Date -
Mar 17, 2011
app pub date -
Feb 17, 2009
filing date -
Mar 5, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process is described for purifying synthesis gas by means of a pressure swing adsorption unit which is desorbed by a vacuum produced by a so-called ejector, which is driven by steam generated by a heat exchanger which uses the heat in the flue gas duct or in the useful-gas duct for the generation of steam. The pressure swing adsorption unit is operated advantageously in cyclic turns of adsorption under excess pressure, depressurization desorption and vacuum desorption and the gas desorbed by the ejector being cooled in a cooler so that the contained steam can be condensed and discharged or is advantageously returned to the feed gas for the synthesis gas production. The foreign gas desorbed by the pressure swing adsorption unit, which contains at least partly not yet consumed fuel gas, is recycled to the fuel gas. In an advantageous embodiment, the vacuum from the ejector is stored in an intermediate tank and applied to the pressure swing adsorption unit according to the vacuum desorption cycle. Also disclosed is a device for running this process.
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