Description

Project Description

A double-effect countercurrent forced circulation evaporation system is supplied for the concentration of calcium chloride solution. The system increases the concentration from 35 wt.% to a minimum of 68 wt.%, providing an ideal feed for downstream solidification and drying.

After evaporation, the concentrated calcium chloride liquor is processed through a rotary cooling flaker followed by a fluidized bed dryer or a spray granulation and fluidized bed dryer system, enabling the production of either calcium chloride dihydrate flakes (77%) or calcium chloride anhydrous granules (94%), depending on the production requirements.

Process Technology   

The system adopts a double-effect countercurrent forced circulation evaporator integrated with a final falling film concentrator, providing high evaporation efficiency while ensuring reliable operation under high-concentration conditions.

Calcium chloride is one of the most challenging salt solutions to concentrate due to its high boiling point. A saturated calcium chloride solution boils at approximately 170°C under atmospheric pressure, requiring a high-temperature heat source. To ensure stable and efficient operation, the system is designed to utilize 1.5 MPa(G) saturated steam as the heating medium.

The countercurrent evaporation configuration maximizes steam utilization and reduces overall energy consumption, while the final falling film concentrator efficiently achieves the target concentration with minimal thermal degradation.

Equipment Description 

The complete evaporation plant is designed to deliver safe, reliable, and energy-efficient operation while minimizing maintenance requirements.

• High Product Concentration

Concentrates calcium chloride solution from 35 wt.% to at least 68 wt.%, meeting the feed requirements for the downstream cooling flaker and drying system.

• Reliable Operation for High-Concentration Brine

-The forced circulation design maintains high liquid velocity through the heat exchangers, significantly reducing the risk of tube blockage caused by highly concentrated calcium chloride solution.

-Minimizes fouling and scaling on the heat transfer surfaces.

-Maintains high heat transfer efficiency throughout continuous operation.

-Extends operating cycles and reduces cleaning frequency, resulting in lower maintenance costs and improved plant availability.

• Safe and Robust Design

All equipment is designed in accordance with industrial safety standards to ensure reliable and stable long-term operation.

Main Equipment Configuration

The complete system includes:

•  One set of Double-Effect Countercurrent Forced Circulation Evaporator

•  One set of Final Falling Film Concentrator

•  One set of Heat Recovery System for recovering thermal energy from the concentrated calcium chloride liquor and condensate, improving overall steam economy

•  One complete PLC Automatic Control System for intelligent monitoring, process control, and reliable plant operation

Customer Benefits

The ENCHEM calcium chloride concentration system provides:

•  High evaporation efficiency

•  Reduced steam consumption through multi-effect evaporation and heat recovery

•  Stable continuous operation with minimal scaling

•  Lower maintenance and cleaning costs

•  High-quality concentrated liquor for downstream flaking and drying

•  Reliable, fully automated operation for long-term industrial production

With extensive experience in calcium chloride evaporation technology, ENCHEM delivers complete turnkey solutions, from process design and equipment manufacturing to installation, commissioning, and after-sales technical support.

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