Precautions for purchasing used evaporators

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At present, many new enterprises have just set up their factories and do not have much capital, so they opt to purchase used evaporators for operation; Old Zhang offers suggestions regarding the precautions to take when making such purchases； 1. First, understand the properties of the solution that needs to be evaporated, and then choose the type and material of the evaporator to purchase. For concentration processes where the solution is unsaturated, falling film evaporation is a suitable option; if the solution does not contain chloride or fluoride ions, 304/316L materials can be used. 2. The solution contains chloride ions; evaporation crystallization is the intended method. Since the pH of the solution is alkaline, any material can be used. However, if the solution is acidic, I still recommend using titanium for the heating coils. 3. The purchased second-hand triple-effect evaporator must have at least 7 main components: the heating/separation chamber for the first effect, the heating/separation chamber for the second effect, the heating/separation chamber for the third effect, and the condenser. Running is essential. 4. Select the evaporation method based on the properties of your material: evaporation crystallization (forced circulation), or evaporation concentration (falling film or rising film). 5. Ensure that there are no leaks in the tubes of the heating chamber, and use forced circulation to ensure that the flow rate of the axial flow pump matches that of the heating chamber. Otherwise, the system cannot function properly. 6. Second-hand equipment generally does not include frames, cable trays, cables, automatic control systems, or automatic control components. I, Zhang (15830976988), can configure the necessary parameters for the equipment you purchase. Piping model and connection process drawings. 7. If you purchase an MVR evaporator, the steam compressor is a key component; pay attention to the temperature rise of the compressor to ensure it can meet the boiling point increase required for your material, otherwise it will not be able to operate.