How Does The Rising Film Evaporator Work?

In the food and beverage industry, evaporators play a significant role in the concentration of liquids, separation of liquids, and thermal treatment of products. Among the various types of evaporators available, the rising film evaporator stands out for its efficiency and ability to handle viscous liquids with high boiling points. In this article, we will explore how the rising film evaporator works and its advantages over other evaporator types.

What is a Rising Film Evaporator?

A rising film evaporator is a type of evaporator that uses a vertical cylindrical shell as its main component. The shell is heated by steam, which circulates inside the shell's jacket. The liquid to be concentrated or evaporated is fed into the top of the shell, and then it flows down the inner walls of the shell in a thin film. As the liquid flows down, it gets heated by the steam in the jacket, causing it to evaporate. The vapor generated by the evaporation rises in the center of the shell and is collected at the top.

How Does it Work?

The rising film evaporator operates on the principle of film evaporation, which involves creating a thin film of the liquid to be evaporated on the heated surface. This thin film is created by a distributor located at the top of the evaporator, which evenly distributes the liquid across the inner walls of the shell. The heated surface of the shell then causes the liquid to boil and evaporate.

The rising film evaporator is designed to ensure that the thin film of liquid flows down the inner walls of the shell at a high velocity, preventing any product from sticking to the walls. The high velocity of the liquid film also ensures that the heat transfer rate between the steam and the liquid is efficient.

Advantages of the Rising Film Evaporator:

The rising film evaporator has several advantages over other types of evaporators, making it the preferred choice in many industries. These advantages include:

1. High Efficiency: The rising film evaporator has a high heat transfer coefficient, which ensures efficient heat transfer between the steam and the liquid. This high efficiency results in lower energy consumption and reduced production costs.

2. Viscous Liquid Handling: The rising film evaporator can handle highly viscous liquids, which are difficult to handle with other types of evaporators. This makes it an ideal choice for industries such as the food and beverage industry, where highly viscous liquids are commonly used.

3. Reduced Fouling: The high velocity of the liquid film in the rising film evaporator ensures that there is no product buildup on the inner walls of the shell. This results in reduced fouling and lower maintenance costs.

4. High Product Quality: The rising film evaporator is designed to operate at low pressure, which helps to maintain the quality of the product being evaporated. This is especially important in industries such as the pharmaceutical industry, where product quality is critical.

Conclusion:

The rising film evaporator is an efficient and reliable evaporator that has become the preferred choice in many industries. Its ability to handle highly viscous liquids, reduce fouling, and maintain high product quality makes it an ideal choice for a wide range of applications. While there are other types of evaporators available, the rising film evaporator's efficiency and ability to handle difficult products make it an attractive option for those looking to improve their production processes. We are a rising film evaporator supplier. If you are interested in our products, please contact us now!