Method and system for cooling and washing biomass syngas

摘要

A method for cooling and washing biomass syngas, the method including the following steps: 1) introducing biomass syngas having a temperature of between 1000 and 1100° C., a dust content of less than 20 g/Nm3, and a tar content of less than 3 g/Nm3 to a quench tower for condensing a slag; 2) introducing the biomass syngas after slag condensation to a waste heat boiler for recovering waste heat and condensing a heavy tar in the syngas; 3) introducing the biomass syngas from the waste heat boiler to a scrubbing-cooling tower for removing dust and decreasing a temperature of the syngas; and 4) introducing the biomass syngas after dust removal and temperature decrease from the scrubbing-cooling tower to an electro-precipitator for further removal of the dust and the tar.

主权项

1. A system for cooling and washing biomass syngas, comprising:
a high temperature pyrolysis gasifier; a water-cooling quench tower connected downstream to the gasifier via a water-cooling flue device; a waste heat boiler, a scrubbing-cooling tower, and an electro-precipitator, all located downstream of the quench tower; wherein water-cooling flue device comprises a water-cooling flue and the water-cooling flue is formed by an inlet water-cooling flue, an upper-bend water-cooling flue, a straight water-cooling flue, a lower-bend water-cooling flue, and an outlet water-cooling flue in series and sealed connection; wherein the waste heat boiler comprises a water-pipe waste heat boiler and a heat-pipe waste heat boiler connected in series; wherein the quench tower is connected to the waste heat boiler, the scrubbing-cooling tower, and the electro-precipitator via syngas pipelines.