What are the reasons why salt cannot be evaporated from the evaporator?
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The company’s single-effect evaporator fails to produce any vapor – what could be the reason? The influent salt concentration is 7000 ppm.
What are the components of the feed? Could you be more specific? Also, salt is one of those components. What type of evaporator do you have – a falling-film type or a simple evaporator?
Salt will precipitate only when its evaporation reaches a saturated concentration and the temperature drops below the crystallization point. Single-effect evaporation requires too much energy; we have an air-enhanced cyclic evaporation system that consumes less energy and has a simpler process. I’m interested in discussing this further.
Possible reasons include: high COD in the impure salts, which makes crystallization difficult; the boiling point of the main components in these impure salts is elevated, preventing them from reaching the crystallization range, which may lead to the formation of mixed salts; there are other reasons as well. A specific analysis is required; first, the phase diagram of that material property must be examined.
The heat exchange area is insufficient or the heat transfer coefficient has decreased.
If the evaporation system is unable to produce salt, first conduct a compositional analysis of the mixture, and then check the amount of water that has been evaporated In general, such cases are mostly related to the compositional relationships of salts.
The analysis on the 6th floor is quite reasonable. Here we use two-stage evaporation, and salt does not appear either; the salt is enclosed by flocculent precipitates in the water, which prevents its emergence. This issue needs to be addressed by improving the quality of the water at the source.
Primary material analysis, composition analysis, and process analysis are all very important. For example, if you use a single-effect system with MVR to evaporate calcium chloride, how can salt be obtained? It’s necessary to conduct analyses based on the actual materials and the specific process equipment. We specialize in transformation and optimization: QQ: 5126728