Rising film evaporation equipment is an efficient industrial evaporation system specifically designed to handle large quantities of heat-sensitive and foamy solutions. As an efficient application of thin film evaporation technology, it achieves rapid evaporation by forming a liquid film rising along the wall of the heating tube, which plays a significant role in ensuring product quality and improving production efficiency.

The rising film evaporation equipment is composed

The core components of the rising film evaporation equipment include:
Housing: Constitutes the sturdy outer frame of the device, protecting the internals and providing support.
Heating tube: The key of the equipment, composed of one or more vertical long tubes, length to diameter ratio of about 100-150, pipe diameter between 25-50mm. The raw material liquid is heated to form steam and rises in a film shape.
Separation chamber: located above the heating chamber, it is responsible for the effective separation of the concentrated liquid from the secondary steam produced.
Preheater: The stock liquid is heated to near the boiling point in advance to ensure that it can quickly vaporize and form a film-like flow when it enters the heating tube.
Film placement device (optional) : To ensure uniform film formation of the solution on the tube wall, some designs have film placement devices on top of the heating tube.
Condenser: Some designs also include a condenser for the recovery or treatment of evaporated secondary steam.

Features of rising film evaporation equipment

High heat transfer efficiency: Because the raw material liquid forms a film in the heating tube, the heating area is increased and the heat transfer efficiency is improved.
Short residence time: the solution quickly passes through the heating chamber in the form of liquid film, and the non-circulating mode reduces the residence time of the material in the equipment, which is suitable for the treatment of heat-sensitive materials.
Stable operation: Provides a stable operating environment, maintains a continuous and efficient evaporation process, and reduces energy consumption.
Wide applicability: suitable for the treatment of large quantities, heat sensitive and easy to foam solutions, but not suitable for the treatment of high viscosity or easy to scale liquids.

Rising film evaporation equipment application field

The main applications of rising film evaporation equipment include:
Chemical industry: mainly used for solvent recovery and purification, effective separation of organic solvents, reduce the cost of waste liquid treatment.
Food industry: Often used for juice, dairy products, alcohol, cooking oil and other liquid concentration, remove water while retaining nutrients.
Environmental protection industry: play a role in the treatment of wastewater and waste liquid, reduce organic matter content, reduce environmental pollution, and realize resource utilization.

The principle of rising film evaporator technology is mainly based on the steam formed after the liquid is heated and boiled in the heating tube, which can drive the liquid to rise along the tube wall into a film shape, so as to realize the evaporation and concentration of the solution.
1. Preheating process: the raw material liquid is first preheated to reach a temperature close to the boiling point.
2. Evaporation process: the preheated raw material liquid is introduced into the tube from the bottom of the heating chamber. After being heated in the tube, the liquid quickly vaporizes to form secondary steam, and the secondary steam generated in this process will drive the liquid to flow upward along the tube wall in a thin film.
3. Separation process: As the solution evaporates upward along the tube wall, it is gradually concentrated and finally reaches the required concentration at the top of the heating chamber. Here, the concentrated liquid is separated from the secondary steam.

The process flow of the rising film evaporator mainly includes the following steps:
1. Preheating: First, the raw material liquid is heated by the preheater so that it reaches a temperature close to the boiling point.
2. Feed: the preheated raw material liquid enters the heating tube of the evaporator from the bottom.
3 Evaporation: In the heating tube, the raw material liquid is heated and boiled to generate secondary steam. In this process, the secondary steam drives the liquid to flow upward along the tube wall in a thin film shape, forming the phenomenon of "rising film".
4. Concentration: As the solution evaporates upward along the tube wall, the liquid gradually concentrates. At the same time, the secondary steam is separated from the concentrate at the top.
5. Separation: The concentrated liquid and the secondary steam are separated in the separation chamber to ensure the effective separation of concentrated liquid and steam.
6. Discharge: the concentrated liquid is discharged from the bottom of the evaporator, while the secondary steam enters the condenser for condensation.
7. Post-treatment: Finally, the concentrated liquid and the secondary steam after condensation are treated as needed, such as solvent recovery or discharge.

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