Case Study of a Japanese Company's MVR Evaporator Project for Treating Electroplating Wastewater in Thailand
Evaporator Type: MVR Evaporator
Equipment Specifications: Evaporation Capacity 200t/d
Project Overview: Evaporation and crystallization of electroplating wastewater. This project utilizes an MVR evaporator tailored to the specific water quality conditions.
Process Flow Description:
Evaporation System Flow:
Raw Water → Preheating System → Forced Circulation Heater → Forced Circulation Separator → Thickener → Centrifuge → Solid Output
The raw liquid and returned mother liquor first enter the preheating system for preheating.
The preheated mixture then enters the inlet of the circulation pump in the MVR forced circulation evaporator. The material absorbs heat from the steam side in the heating chamber through the circulation pump, then boils in the crystallizer. The secondary steam from boiling and evaporation rises, while the concentrated liquid remains at the bottom of the crystallizer due to gravity. After evaporation, the concentration of the liquid in the crystallizer increases, reaching the set value. It is then discharged from the separator, enters the thickener, and then the centrifuge to obtain crystals. The mother liquor is returned to the preheating system.
Secondary Steam Flow:
Secondary Steam → Demister → Heater Steam Side → Condensation → Heat Recovery → Discharge from System
The secondary steam generated by evaporation carries a small amount of liquid droplets. This dirty secondary steam rises and enters the demister. Through countercurrent washing, the tiny droplets entrained in the secondary steam are washed out and re-enter the feed liquid. The secondary steam, cleaned of impurities, enters the inlet of the steam compressor, where its temperature increases. It then flows through the secondary steam outlet pipe into the heater.
After heat exchange in the heater, the secondary steam condenses into water and goes to the preheater to preheat the feedstock.
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