Selection of MVR negative pressure evaporation equipment
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For salt-acid waste liquid at a rate of 10 T/D, with a concentration of 10% and an iron content of 100 g/L, what size of negative pressure evaporation equipment is required?
The required level of negative pressure depends mainly on the increase in the boiling point of your material. You need to conduct experiments first to determine that increase in boiling point, before you can decide on the exact level of negative pressure needed.
The biggest issue when making a selection is the material; I’m currently working on a system for absorbing ammonia using high-temperature sulfuric acid, and corrosion prevention is a real challenge
Due to the constraints imposed by the material, it is best to keep the temperature of the material below 95°C. Water boils at 95°C at a pressure of 85 kPa; therefore, a negative pressure of 85–101.3 = -16.3 KPa is selected
This requires detailed information on the solute content of the materials as well as the measurement of the boiling point elevation of the solution in order to carry out the system design for the entire MVR evaporator
It boils with hydrochloric acid and water, so there will be acid in the vapor – can the compressor still be used? It is considered that this process route is not feasible.