Description

What Is a TVR Evaporator?

A TVR (Thermal Vapor Recompression) evaporator is a highly energy-efficient evaporation system that utilizes thermal vapor recompression technology to recover and reuse secondary steam generated during the evaporation process. By recycling thermal energy that would otherwise be wasted, the system significantly reduces live steam consumption and lowers operating costs.

Compared with a conventional multiple-effect evaporator, a TVR evaporator incorporates a steam ejector that recompresses part of the secondary vapor and reuses it as the heating medium. This simple yet effective design improves steam economy while maintaining high reliability and stable operation.

Working Principle

A TVR evaporator is based on the principle of multiple-effect evaporation with the addition of a steam ejector (thermal vapor recompressor).

High-pressure live steam is supplied to the steam ejector as the motive steam. The high-velocity steam creates a vacuum that entrains a portion of the low-pressure secondary vapor generated by the evaporator. The two steam streams mix inside the ejector and are compressed to an intermediate pressure and temperature.

The recompressed mixed steam is then reused as the heating medium for the evaporator, reducing the demand for fresh live steam. Through this thermal vapor recompression process, a significant portion of the latent heat contained in the secondary vapor is recovered, resulting in substantial energy savings.

Process Flow

The feed solution enters the evaporator and is preheated to its boiling temperature by the heating system. As evaporation takes place, water is continuously vaporized, generating secondary steam while the product becomes increasingly concentrated.

Once the required concentration is achieved, the concentrated product is discharged from the system.

Part of the generated secondary steam is drawn into the steam ejector, where it is mixed with high-pressure motive steam and recompressed for reuse as the heating steam. The remaining secondary steam is condensed in the condenser, and the condensate is discharged or recovered for reuse, depending on the process requirements.

This continuous recycling of thermal energy greatly improves the overall energy efficiency of the evaporation system.

Main Features

• Excellent energy efficiency by recovering and reusing secondary steam through thermal vapor recompression.

• Reduced live steam consumption, with energy savings equivalent to adding an additional evaporator effect.

• Simple and reliable design, as the steam ejector has no moving parts, resulting in low maintenance requirements and long service life.

• Lower condenser load, reducing cooling water consumption and improving overall system efficiency.

• Continuous and stable operation, suitable for long-term industrial production.

• Easy integration with falling film, forced circulation, and multiple-effect evaporation systems.

Capacity Range

TVR evaporators can be customized to meet different production requirements, with evaporation capacities ranging from 0.1 to 200 tons of water evaporation per hour.

Our engineering team provides customized process design based on product characteristics, evaporation capacity, energy consumption targets, and process requirements to ensure optimum performance and operating efficiency.

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