【Monthly Topic】Discussion on the treatment of concentrated brine in coal chemical industry
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At present, the treatment of concentrated brine in coal chemical industries not only suffers from immature technologies but also involves high treatment costs! If combined with a fixed-bed pressurized gasifier, by injecting it into a specific layer of the gasifier (where the organic substances and moisture are removed through evaporation in the gasifier’s drying layer), there is no major issue from a conceptual standpoint regarding the disposal of the remaining salts along with the ash. Please discuss potential problems that may arise in actual operation It is said that such a practice exists abroad. There are rewards for participation!
Hm, such a coincidence? Is your company in Hebei? It can’t be such a coincidence. I’m going to Hebei next week to conduct technical exchanges on the concentrated brine treatment you mentioned.
Organic substances are easy to handle; if not, they can be burned in a water-coal slurry gasifier. The problem lies with inorganic salts, as those are more difficult to deal with
For now, using concentrated brine to prepare coal slurry for combustion in water-coal slurry gasifiers is an option; compared to other treatment methods, it either comes at the cost of environmental protection or at the cost of efficiency. I think there is another approach, which is to use dry methods for purifying gas, ideally with no water involved in the process. In that case, there would be no water-based system, and thus no wastewater generation either. The amount of concentrated saltwater would also be significantly reduced; if its volume is small, I think it would be much easier to handle. For coal gasification, the radiant furnace process combined with dry dust removal can be used; however, these two processes are not widely employed at present, as they still need further improvement and development.
This salt either moves into the gas phase or into the solid phase if it isn’t in water; it will never disappear without reason. Currently, environmental regulations may not set any requirements regarding its presence in gas or solid forms, so it can only be avoided temporarily. The best solution is to use evaporation crystallization to make the recycled water cleaner.
Multiple-effect evaporation is employed after membrane concentration.