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Multiple-effect evaporation (MEE) is an energy-saving process compared to single-effect evaporation. While a single-effect evaporator has only one effective evaporation chamber, multiple-effect evaporators have multiple chambers. The key difference lies in the utilization of steam: in a single-effect evaporator, the steam is directly condensed, whereas in multiple-effect evaporators, the secondary steam from the preceding effect is reused to save energy. Multiple-effect evaporation is a primary means of energy conservation, and generally, the more effects, the better the steam economy. Typically, three-effect and four-effect evaporators are common. Multiple-effect evaporators can be categorized based on their form, such as tubular and plate types, and based on evaporation methods, such as falling-film evaporation, rising-film evaporation, as well as concurrent flow and countercurrent flow configurations.

Chemical industry

Food

Pharmaceutical Industry

Environmental Engineering

Biology

Renewable Energy

Coal Chemical Industry

Sodium Chloride

Amino Acids

Chinese Herbal Concentrate

Fermentation Broth

Nickel Sulfate

System Composition

Tube multi-effect evaporator Process Description

Multi-effect Heating and Evaporation

In multi-effect evaporation, heating steam is introduced into the first effect. The secondary steam generated from the first effect serves as the heating steam for the second effect, while the heating chamber of the second effect functions as the condenser for the first effect. The secondary steam produced from the second effect then serves as the heating steam for the third effect, and so on, with multiple evaporators connected in series to form multi-effect evaporation.

Temperature, Boiling Point, Concentration Changes

Due to the decreasing operating pressure in the evaporation chambers during multi-effect operation, the last effect of the multi-effect evaporator in production is connected to a vacuum device. The heating steam temperature and the boiling point of the solution in each effect also decrease sequentially, while the concentration of the final product increases with each effect.

Condensation

The secondary steam from the last effect enters the condenser and is cooled and condensed into water for removal.

Multi-effect Evaporators: Energy-efficient, Low Energy Consumption, Compact Structure, High Automation, Stable and Reliable, Highly Adaptable

Energy-efficient

The most significant characteristic of multi-effect evaporators is their energy efficiency. By fully utilizing the energy of secondary steam, the energy consumption of multi-effect evaporators is more than 30% lower than that of single-effect evaporators.

Compact Structure

Multi-effect evaporators have a relatively compact structure and occupy a small footprint. Due to their design with multiple evaporators connected in series, the equipment has a smaller volume, allowing it to better coordinate with other equipment in the production process and improve production efficiency.

Stable and Reliable

Each part of the multi-effect evaporator has independent control devices to ensure stable operation of the equipment. Additionally, the high degree of automation of the equipment reduces errors caused by manual operation.

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