PROCESS FOR COOLING AND WASHING BIOMASS SYNGAS AND SYSTEM THEREOF

摘要

Provided is a process for cooling and washing a biomass syngas and system thereof. The process is directed to a biomass syngas with a temperature of 1000-1100°C, a dust content of less than 20 g/Nm3 and a tar content of less than 3g/Nm3; the process comprises the following steps: 1) the syngas is sent to a chilling tower (2) to be chilled and to solidify slag; 2)after being chilled to solidify slag, the syngas is sent to a waste heat boiler to perform recycling of the waste heat and condense the heavy tar in the syngas; 3) the syngas passed through the waste heat boiler is sent to a washing and cooling tower (5) for dust extraction and cooling; 4) the syngas remaining after dust extraction and cooling in the washing and cooling tower (5) is sent to an electrostatic precipitator (6) to perform deep extraction of dust and tar removal. The system comprises a chilling tower (2) linked to a high-temperature pyrolysis biomass gasifier; the chilling tower (2)is linked to the waste heat boiler, the washing and cooling tower (5) and the electrostatic precipitator (6) via syngas pipelines in succession. The present process is fluent, simple in system structure, highly efficient in heat use, and syngas treatment gives good results.