Description

Project Overview

This project was developed for the treatment of high-salinity wastewater generated by the coal chemical industry. The wastewater contained high concentrations of dissolved salts, elevated COD, high hardness, and trace amounts of heavy metals, making it a challenging stream for conventional wastewater treatment processes.

To achieve efficient concentration and salt recovery while ensuring reliable long-term operation, ENCHEM designed and supplied a triple-effect forced circulation evaporation system. The multi-effect configuration significantly reduces steam consumption, while the forced circulation design effectively handles high-solids and scaling-prone wastewater, making it an ideal solution for industrial wastewater concentration and Zero Liquid Discharge (ZLD) applications.

Process Solution    

The high-salinity wastewater is continuously concentrated in the triple-effect forced circulation evaporator until it reaches the desired concentration or supersaturation. The concentrated slurry is then transferred to a centrifuge for solid-liquid separation.

The separated salt crystals are collected for further treatment or disposal, while the mother liquor is sent to downstream thermal treatment or incineration according to the process requirements. The system also incorporates condensate heat recovery to improve overall energy efficiency and reduce operating costs.

Key Features

• Triple-effect evaporation technology

Minimizes steam consumption and lowers operating costs.

•  Forced circulation design

Provides high circulation velocity, preventing crystal settling and reducing the risk of heat exchanger tube blockage.

• Excellent anti-scaling performance

Ensuring stable heat transfer and extended continuous operation.

• Suitable for high-salinity, high-hardness, and high-COD wastewater

•  Integrated condensate heat recovery system

Improves overall energy utilization.

•  PLC-based automatic control system

Enables reliable operation, real-time monitoring, and simplified plant management.

•  Designed for continuous industrial operation

With reduced maintenance and cleaning frequency.

System Configuration

A complete triple-effect forced circulation evaporation system typically includes:

•  Triple-effect forced circulation evaporators

•  Forced circulation pumps

•  Steam heaters and separators

•  Vacuum system and condenser

•  Centrifuge with mother liquor collection system

•  Condensate heat recovery system

•  PLC automatic control system

Applications

The triple-effect forced circulation evaporator is widely used in industries requiring the treatment of high-salinity and high-fouling wastewater, including:

•  Coal chemical industry

•  Petrochemical industry

•  Chemical manufacturing

•  Mining and metallurgy

•  Industrial wastewater treatment

•  Zero Liquid Discharge (ZLD) systems

•  Salt recovery and crystallization processes

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