1. Selection of evaporator type

type

Applicable working conditions

characteristic

Forced circulation evaporator

Working conditions with high viscosity, easy scaling, and containing crystalline particles

High flow rate (1.5-3m/s), anti blocking and anti scaling, wide applicability

falling film evaporator

Low viscosity, heat sensitivity, and no crystallization conditions

High heat transfer coefficient, short residence time, suitable for thermosensitive materials

OSLO/DTB crystallizer

Operating conditions requiring control of crystal particle size

Crystal uniformity, high purity, suitable for crystallization needs

2. Material selection

Material Type

Applicable scenarios

core advantage

316L stainless steel

Low chlorine environment (<200ppm)

Corrosion resistance, moderate cost, suitable for conventional working conditions

Duplex stainless steel 2205/2507

Conventional high salt scenario, chloride ion<0.5g/L

Resistant to pitting corrosion, suitable for most industrial high salt wastewater

Titanium alloy TA2

Chloride ion>500ppm or high temperature acidic working conditions

Resistant to strong corrosion and suitable for extreme high chlorine environments

Hastelloy C-276

Extreme corrosive environments such as cyanide and strong acids

Resistant to strong corrosion and suitable for various extremely complex working conditions

3. Compressor selection

compressor type

Applicable temperature rise

characteristic

Roots compressor

8-15℃

Simple structure, suitable for materials with low boiling point rise, moderate cost

Centrifugal compressor

12-25℃

High efficiency, stable operation, suitable for most industrial wastewater scenarios

Multi stage series compressor

>25℃

Suitable for high boiling point materials, with high investment but stable operation

Material supplement

-

The material of the compressor should match the working conditions, and carbon steel with nickel plating or duplex steel should be preferred

4. Auxiliary equipment

Circulating pump: high flow, low head axial flow pump, variable frequency regulation.

Solid liquid separation: Separation of crystalline salts using a centrifuge or vacuum belt filter.

Drying system: Airflow drying/disc dryer to ensure product moisture content<0.5%.

Automation system: PLC/DCS+online cleaning (CIP), fault interlock protection.