| 主权项 |
1. A method to reduce the formation of effluent water in coal gasification and syngas pretreatment processes comprising the following steps:
transferring a high temperature syngas from a gasifier to a cooler for initial cooling to produce a cooled syngas, transferring the cooled syngas to a dust remover to produce a cooled and dedusted syngas, transferring the cooled and dedusted syngas to a concentrator, transferring the cooled and dedusted syngas from the concentrator to a scrubber to remove impurities transferring the impurities to washing water to produce a salt containing water, transferring said salt containing water from the scrubber to the concentrator, contacting the salt containing water with warm syngas from the gasifier, evaporating a portion of the salt containing water by the heat from the warm syngas, to produce a high salt concentration residual water, transferring the high salt concentration residual water out of the concentrator, mixing the vapor generated by evaporation with said cooled syngas, to produce a superheated syngas, transferring the superheated syngas out from the scrubber to a catalytic shift reactor for water-gas shift reaction, transferring the superheated syngas from the catalytic shift reactor to produce a cooled syngas in a plurality of cooling stages, in a first cooling stage producing a first condensate water and transferring this to the scrubber as circulation washing water, in a second cooling stage producing a second condensate water and returning the second condensate water to the second cooling stage as cooling water, transferring the cooled syngas to an ammonia washing tower and washing with demineralized water to produce washing water, transferring the washing water to the scrubber for syngas scrubbing, transferring the syngas from the ammonia washing tower to a purification system. |
