Which ash treatment technology should be chosen for water-coal slurry gasification?
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This post was last edited by huaguiyi on 2009-9-8 at 19:25. Currently, there are two approaches for treating the ash water generated in coal-water slurry gasification: one is the “GE” technology. The flash steam recovers heat through a heat exchanger, while preheating the graywater. Heat exchangers are prone to scaling and blockage, resulting in poor heat transfer efficiency and difficulty in cleaning... Second is the technology of “Huali”. The flash vapor is directly heat-exchanged with graywater, eliminating the need for a heat exchanger. The quality of the graywater fed into the scrubber tower may be somewhat poor... Please discuss this based on that fact...
Who has a schematic diagram of the water treatment process at East China University of Science and Technology? Please share it
The result of direct heat exchange is fouling of the packing, water carried in the flash vapor, and fluctuations in the container liquid level. Unless it is necessary to avoid patents, there is no need for direct heat exchange. GE is pretty good.
In both cases it’s similar; the GE low-flash gas also goes directly into the deoxidation tank for heat recovery