Rising Film Evaporator (RFE) for Efficient Processing
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Introduction to the Rising Film Evaporator (RFE)
The rising film evaporator (RFE) is an efficient evaporation device used in the industrial field to handle large quantities, heat sensitive and foamy solutions. As a class of thin film evaporation devices, it plays a key role in ensuring product quality and improving production efficiency through efficient heat transfer and rapid evaporation process.
The Rising Film Evaporator (RFE) is composed
The core components of the rising film evaporator unit include:
1. Shell: as the main structure of the rising film evaporator (RFE), it protects and supports the internal functional components.
2. Heating tube: This is the core element of the device, which is composed of one or more vertical long tubes, with a length to diameter ratio of 100-150, and the diameter of the tube is between 25-50mm, so that the raw material liquid can be heated and boiled in the tube and rise along the tube wall in a film shape.
3. Separation chamber: located at the top of the heating chamber, it is responsible for effectively separating the concentrated liquid from the secondary steam generated.
4. Preheater: preheat the raw material liquid to near the boiling point to ensure that it quickly vaporizes to form a film-like flow when entering the heating tube.
5. Film distribution device (if applicable) : Some designs require this device at the top of the heating tube to ensure uniform film formation of the solution.
6. Condenser: Some designs also include a condenser to condense secondary steam for easy gas recovery or treatment.
Features of Rising Film Evaporator (RFE)
The rising film evaporation unit has the following features:
1. High heat transfer efficiency: the film formed by the raw material liquid on the inner wall of the heating tube increases the heating area, improves the heat transfer coefficient and thermal efficiency.
2. Short residence time: the solution quickly passes through the heating chamber in the form of liquid film, and the non-circulating mode shorens the residence time, which is suitable for heat-sensitive materials.
3. Stable operation: Provide a stable operating environment, maintain efficient evaporation and reduce energy consumption.
4. Wide applicability: suitable for evaporation of large, heat-sensitive and foamy solutions, but not suitable for dealing with high viscosity or easy scaling solutions.
Application field of Rising Film Evaporator (RFE)
Rising film evaporator (RFE) are widely used in:
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 to concentrate fruit juice, dairy products, alcohol, cooking oil, etc., evaporation to remove water and retain nutrients.
Environmental protection industry: treating wastewater and waste liquid, evaporating organic matter, reducing the volume of waste liquid, reducing environmental pollution, 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:
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.
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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