1、 Working principle

The forced circulation evaporator generates external power through a large flow circulation pump, and sends the crystal slurry or solution in the separator into the heating chamber at a high speed of 1.5-3 meters per second. The material is heated during the flow in the heat exchange tube, with a temperature rise of about 1-5 ℃. The heated material enters the separator, and due to the decrease in pressure, the material evaporates instantly by flash evaporation, while the liquid temperature cools to its boiling point at the current pressure. The generated secondary steam is discharged from the top of the separator, and the finished liquid or concentrated liquid is discharged from the bottom or continues to circulate.

2、 Main features

1. Excellent anti scaling and anti salt precipitation ability

The material flow rate inside the heat exchange tube is as high as 3 meters per second, far higher than the natural circulation flow rate. High speed turbulence ensures that the movement of materials inside the tube is equivalent to the flow in a straight pipe. Even if there are a small amount of crystalline particles, they can be quickly carried away, effectively suppressing scaling and crystallization of salt on the surface of the heat exchange tube, greatly extending the cleaning cycle.

2. High heat transfer coefficient and high evaporation efficiency

The high flow rate brings about an extremely high heat transfer coefficient, and the system's thermal efficiency is significantly better than that of a natural circulation evaporator. Although the power of the circulating pump is relatively high, the integration of MVR (mechanical vapor recompression) technology can achieve efficient energy utilization and controllable overall operating costs.

3. Flexible combination design process

According to the characteristics of the evaporated material, a falling film unit can be designed at the front end for pre concentration, and a forced circulation unit can be used at the back end for final concentration or continuous crystallization. This combination process not only saves initial equipment investment but also reduces operating costs, making it an ideal solution for handling complex working conditions.

3、 Application scope

Materials prone to scaling: high hardness water, calcium and magnesium ion containing material solution, circulating cooling water wastewater

Easy to crystallize materials: inorganic salt evaporation crystallization (sodium chloride, sodium sulfate, sodium carbonate, etc.), pesticide intermediates

High viscosity materials: certain polymers, viscous solutions

Wastewater treatment: high COD wastewater, leachate from garbage, desulfurization wastewater, electroplating wastewater

Special operating conditions: Concentrate the liquid containing particles or precipitates

System form:

MVR forced circulation evaporator: utilizing secondary steam from a steam compressor, energy-saving and environmentally friendly

Multi effect forced circulation evaporator: suitable for scenarios with sufficient heat sources or specific process requirements

Forced circulation crystallizer: designed specifically for continuous crystallization processes, controlling crystal particle size and purity