METHOD AND APPARATUS FOR PURIFYING AND COOLING BIOMASS SYNGAS
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United States of America Patent
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Dec 14, 2017
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Jun 24, 2015
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A method for purifying and cooling biomass syngas. The method includes: 1) cooling biomass syngas to 520-580° C., and recycling waste heat to yield a first steam; then subjecting the biomass syngas to cyclone dust removal treatment; and further cooling the biomass syngas to a temperature of ≤210° C., and recycling waste heat to yield a second steam; 2) removing a portion of heavy tar precipitating out of the biomass syngas during the second-stage indirect heat exchange; 3) carrying out dust removal and cooling using a scrub solution, to scrub off most of dust, tar droplets, and water soluble gases from the biomass syngas after the heat exchange and dust removing treatment; and 4) conducting deep removal of dust and tar with a wet gas stream, to sweep off remains of dust and tar fog in the scrubbed biomass syngas.
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