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MVR process

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MVR process

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The working process of MVR is as follows: A compressor compresses low-temperature-level vapor to increase its temperature, pressure, and heat content. The compressed vapor then enters a heat exchanger for condensation, allowing full utilization of the latent heat of the vapor. Except for the start-up phase, the evaporator does not require additional steam generation for the secondary vapor throughout the entire evaporation process. After being compressed by the compressor, the vapor’s pressure and temperature rise, and its heat content increases. It is then sent to the heating chamber of the evaporator to be used as heating steam, which keeps the feed liquid in a boiling state, while the heating steam itself condenses into water. In this way, waste vapor can be fully utilized, latent heat is recovered, and thermal efficiency is improved. The economic efficiency of live steam is equivalent to that of a 30-effect multi-effect evaporation system.

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Overview

- Commodity name: MVR process
The working process of MVR is as follows: A compressor compresses low-temperature-level vapor to increase its temperature, pressure, and heat content. The compressed vapor then enters a heat exchanger for condensation, allowing full utilization of the latent heat of the vapor. Except for the start-up phase, the evaporator does not require additional steam generation for the secondary vapor throughout the entire evaporation process. After being compressed by the compressor, the vapor’s pressure and temperature rise, and its heat content increases. It is then sent to the heating chamber of the evaporator to be used as heating steam, which keeps the feed liquid in a boiling state, while the heating steam itself condenses into water. In this way, waste vapor can be fully utilized, latent heat is recovered, and thermal efficiency is improved. The economic efficiency of live steam is equivalent to that of a 30-effect multi-effect evaporation system.
Introduction to the MVR Process

1. MVR Principle

MVR is the abbreviation of Mechanical Vapor Recompression technology. The MVR evaporator is an energy-saving technology that can reuse the secondary vapor energy generated by itself, thereby reducing the demand for external energy sources.

The working process of MVR is as follows: A compressor compresses low-temperature-level vapor to increase its temperature, pressure, and heat content. The compressed vapor then enters a heat exchanger for condensation, allowing full utilization of the latent heat of the vapor. Except for the start-up phase, the evaporator does not require additional steam generation for the secondary vapor throughout the entire evaporation process. After being compressed by the compressor, the vapor’s pressure and temperature rise, and its heat content increases. It is then sent to the heating chamber of the evaporator to be used as heating steam, which keeps the feed liquid in a boiling state, while the heating steam itself condenses into water. In this way, waste vapor can be fully utilized, latent heat is recovered, and thermal efficiency is improved. The economic efficiency of live steam is equivalent to that of a 30-effect multi-effect evaporation system.

To make the manufacturing of the evaporation device as simple as possible and its operation convenient, high-pressure fans and high-pressure blowers can be used. These machines have a relatively high volumetric flow rate within a compression ratio range of 1:1.2 to 1:2.

2. MVR Process Flow

The system consists of single-effect or double-effect evaporators, separators, compressors, vacuum pumps, circulating pumps, operating platforms, electrical and instrument control cabinets, valves, pipelines, and other components. It features a simple structure and easy operation and maintenance.

Introduction to Evaporators

MVR Falling Film Evaporator

Working Principle

The feed liquid is added from the channel box of the heat exchanger, and a liquid distributor distributes the material into each heat exchange tube, forming a uniform liquid film along the inner wall of the heat exchange tubes. During the downward flow, the liquid film inside the tubes is heated by the heating steam in the shell, and boils and evaporates as it flows downward. At the bottom of the heat exchange tubes, the material is converted into concentrated liquid and secondary vapor.

The concentrated liquid falls into the lower channel box, while the secondary vapor enters the gas-liquid separator. The liquid droplets carried by the secondary vapor are removed in the gas-liquid separator, and the pure secondary vapor is transported from the separator to the compressor. The compressor compresses the secondary vapor, which is then sent to the shell of the heat exchanger as heating steam to serve as the heat source for the evaporator, realizing a continuous evaporation process.

Characteristics
1. High heat exchange efficiency
2. Small floor space
3. Short material residence time, which prevents material deterioration
4. Suitable for materials with relatively high viscosity
Application Scope

The falling film evaporator is suitable for the pre-concentration process in the MVR evaporation and crystallization process. It can evaporate materials with relatively high viscosity and is particularly suitable for heat-sensitive materials, but it is not suitable for the treatment of crystalline materials.