Rising Film Evaporation System: High Efficiency
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Introduction to rising film evaporation system
Rising film evaporation system is a high-efficiency industrial evaporation equipment designed for processing large quantities of heat-sensitive and foaming solutions. As a type of thin film evaporation technology, the rising film evaporation system provides efficient heat transfer and rapid evaporation process through its advanced design, which plays a key role in ensuring product quality and improving production efficiency.
Composition of rising film evaporation system
The core components of the rising film evaporation system include:
Shell: constitutes the main body of the equipment and provides protection for internal components.
Heating tube: This is a key part of the rising film evaporation system, usually composed of one or more vertical long tubes with an aspect ratio of about 100-150 and a tube diameter between 25-50mm. The raw material liquid is heated and boiled in the heating tube, generating secondary steam and rising in a film-like manner along the tube wall.
Separation chamber: located at the top of the heating chamber, it is used to separate the concentrated liquid from the secondary steam to ensure the effective distinction between the concentrated liquid and the steam.
Preheater: The preheater is used to preheat the raw material liquid to near the boiling point to ensure that it can quickly vaporize and form a film-like flow when entering the heating tube.
Film-laying device: In some designs, a film-laying device may be required on the top of the heating tube to ensure that the solution can form a uniform film on the tube wall.
Condenser: In some designs, a condenser for condensing secondary steam may also be included to recover or further process the evaporated gas.
Advantages of rising film evaporation system
The rising film evaporation system has the following significant advantages:
Ultra-high heat transfer efficiency: The thin film formed on the inner wall of the heating tube greatly increases the heat exchange area, thereby improving the heat transfer coefficient and thermal efficiency.
Short residence time: Since the solution passes through the heating tube quickly in the form of a thin film and does not need to be circulated, the residence time in the evaporation system is shortened, which is especially suitable for heat-sensitive materials.
Stable operating performance: The rising film evaporation system can provide stable operating conditions, which helps to maintain an efficient evaporation process while reducing energy consumption.
Wide range of applications: It is especially suitable for processing large amounts of heat-sensitive or foaming solutions, but it is not suitable for solutions with high viscosity, easy crystallization or easy scaling.
Scope of application of rising film evaporation system
Rising film evaporation system is widely used in:
Chemical industry: mainly used for solvent recovery and purification, effectively separating organic solvents, realizing resource reuse, and reducing waste liquid treatment costs.
Food industry: commonly used for the concentration of juice, dairy products, alcohol, edible oil and beverages, removing water by evaporation to achieve the purpose of concentration and purification while retaining nutrients.
Environmental protection industry: plays an important role in the field of wastewater treatment, reducing the content of organic matter by evaporation, reducing the volume of waste liquid, reducing the environmental burden, and realizing resource utilization.
Technical principle of
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 production process of
The process flow of the rising film evaporator mainly includes the following steps:
Preheating: First, the raw material liquid is heated by the preheater so that it reaches a temperature close to the boiling point.
Feed: the preheated raw material liquid enters the heating tube of the evaporator from the bottom.
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".
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.
Separation: The concentrated liquid and the secondary steam are separated in the separation chamber to ensure the effective separation of concentrated liquid and steam.
Discharge: the concentrated liquid is discharged from the bottom of the evaporator, while the secondary steam enters the condenser for condensation.
Post-treatment: Finally, the concentrated liquid and the secondary steam after condensation are treated as needed, such as solvent recovery or discharge.
Production of equipment
WTEYA aims to digital and intelligent production to provide superior products and services to its customers. We not only provide a wide range of standard products which are seriously tested and stable performance to meet a wide range of industrial needs. We also provide custom service, as well as OEM and ODM services, professional design team provides proper solutions for customers to meet their unique needs. We will work closely with each customer to ensure that every device suits customer's process requirements and production process accurately. WTEYA's one-stop service, innovative to create high-quality mechanical products and system solutions, professionally help customer deal with various water treatment problems.
Frequently Asked Questions
Q: When the rising film evaporator is running, why does the liquid distribution appear uneven?
A: This may be due to improper feed system design or improper operating conditions. This can be improved by ensuring that the film dispensing device distributes the liquid evenly and adjusting the appropriate feed rate.
Q: How to deal with the scaling problem of the heating pipe in the rising film evaporator?
A: Regular cleaning of heating tubes is a common way to deal with scaling. According to the nature of the solution, choose the appropriate cleaning agent and cleaning cycle, if necessary, use mechanical or chemical cleaning.
Q: Is rising film evaporator suitable for handling high viscosity solutions?
A: Not suitable. Rising film evaporator is more suitable for dealing with good flow, not easy to scale solution, high viscosity solution may lead to film flow obstruction and heating tube blockage.
Q: If the raw material liquid contains solid particles, what will be the impact on the rising film evaporator?
A: The raw material liquid containing solid particles may cause wear on the inner wall of the heating pipe, and long-term operation may lead to pipe leakage. Pretreatment to remove particles or selection of suitable wear-resistant materials is necessary.
Q: How to control the concentration of the solution during the operation of the rising film evaporator?
A: By monitoring the temperature and amount of secondary steam, as well as the concentration of the discharge, the operating parameters of the evaporator can be adjusted to control the concentration of the solution.
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