Method of purification of biomass syngas under negative pressure

摘要

A method for purifying biomass syngas, including: a) introducing syngas out of a gasifier, through a water-cooling flue to a water-cooling quench tower; b) introducing the syngas from the water-cooling quench tower to a waste heat boiler of a water-tube type and a waste heat boiler of a heat-tube type; c) washing the syngas from the waste heat boiler of the heat-tube type in a Venturi scrubber in the absence of a filler to remove dust; d) introducing the syngas from the Venturi scrubber to a wet electrical dust precipitator for conducting dust removal and tar mist removal; and e) extracting the syngas by a coal gas draft fan, and transporting the syngas to a wet gas tank for storage or to a downstream process for use.

主权项

1. A method for purifying biomass syngas, comprising:
a) introducing syngas out of a gasifier via a top of the gasifier, through a water-cooling flue to a water-cooling quench tower, where water is sprayed into the syngas for quenching slag; b) introducing the syngas from the water-cooling quench tower to a waste heat boiler of a water-tube type to yield a first vapor and a first cooled syngas having a temperature of 450±20° C.; introducing the first cooled syngas to a waste heat boiler of a heat-tube type to yield a heavy tar, a second vapor, and a second cooled syngas having a temperature of 200±10° C.; and supplying the first vapor and the second vapor to external devices; c) washing the second cooled syngas in a Venturi scrubber in the absence of a filler to yield a first purified syngas; d) introducing the first purified syngas from the Venturi scrubber to a wet electrical dust precipitator to yield a second purified syngas for conducting dust removal and tar mist removal; and e) extracting the second purified syngas by a coal gas draft fan, and transporting the second purified syngas to a wet gas tank for storage or to a downstream process for use.