Rising Film Evaporation System: High Efficiency
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Introduction to rising film evaporation system
The rising film evaporation system is a highly efficient industrial evaporation equipment specifically designed to handle large volumes of heat-sensitive and foam-prone solutions. As a type of film evaporator, the rising film evaporation system plays a key role in ensuring product quality and improving production efficiency with its superior heat transfer efficiency and fast processing process.
The rising film evaporation system is composed
Components of the rising film evaporation system include:
1. Shell: constitutes the main structure of the rising film evaporation system, protecting and supporting the internal functional components.
2. Heating tube: This is the core of the entire system, composed of one or more vertical long tubes, with a 100-150 aspect ratio, usually between 25-50mm diameter. The raw material liquid is heated and boiled in the heating tube, and secondary steam is generated and rises along the tube wall in a film shape.
3. Separation chamber: located above 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 can quickly vaporize to form a film-like flow when entering the heating tube.
5. Film placement device (if applicable) : Some designs may require a film placement device on top of the heating tube to ensure uniform film formation of the solution.
6. Condenser: Some designs also include a condenser for condensing secondary steam to facilitate gas recovery or treatment.
Features of rising film evaporation system
The rising film evaporation system has the following significant features:
1. High heat transfer efficiency: the raw material liquid forms a film on the inner wall of the heating tube, increasing the contact area with the heating surface, thereby improving the heat transfer coefficient and the overall thermal efficiency.
2. Short residence time: The solution quickly passes through the heating chamber in the form of liquid film without circulation, so the residence time in the system is short, suitable for processing heat-sensitive materials.
3. Stable operation: Provide a stable operating environment, maintain an efficient evaporation process, reduce energy consumption.
4. Wide range of application: suitable for the treatment of large quantities, heat sensitive and foamy solutions, but not suitable for solutions with high viscosity or easy scaling.
Application field of rising film evaporation system
Rising film evaporation systems are widely used in the following fields:
Chemical industry: mainly used for the recovery and purification of organic solvents, effective separation of organic solvents, to achieve waste liquid reduction and resource utilization.
Food industry: Used for juice, dairy products, alcohol, cooking oil and other food liquid concentration, remove water to achieve the purpose of concentration while retaining nutrients.
Environmental protection industry: plays an important role in wastewater treatment, evaporation to remove organic matter, reduce the volume of waste liquid and environmental pollution, and promote waste liquid resources.
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.