Scraped surface heat exchanger

Scraped surface heat exchanger is a highly efficient heat exchange equipment, which plays an indispensable role in many industrial fields.

1. Structure and working principle

Scraped surface heat exchanger is mainly composed of shell, rotor, scraper, heating or cooling medium channel and other parts. The internal rotor is equipped with scrapers, which maintain a very small gap with the inner wall of the shell. When the material enters the heat exchanger, the rotor drives the scraper to rotate continuously.

During the working process, the heating or cooling medium on one side flows through a special channel to transfer heat to the wall of the heat exchanger. The material on the other side flows in the shell under the push of the scraper. The continuous scraping of the scraper has multiple important functions. On the one hand, it can prevent the material from scaling on the wall or forming a laminar bottom layer with large thermal resistance, thereby improving the heat transfer efficiency; on the other hand, the stirring of the scraper enables the material to be fully mixed, ensuring that the material temperature is uniform and accelerating the heat transfer speed.

2. Performance Advantages

High-efficiency heat transfer

Due to the scraping action of the scraper, the scaling and laminar bottom problems common in traditional heat exchangers are effectively overcome, which greatly improves the heat transfer coefficient. Compared with ordinary heat exchangers, the scraped surface heat exchanger can achieve the same heat exchange at a smaller temperature difference, or more heat exchange at the same temperature difference.

Handling high-viscosity materials

The scraped surface heat exchanger is particularly good at handling high-viscosity materials, such as thick sauces, pastes, and viscous chemical raw materials. These high-viscosity materials often have difficulty flowing in ordinary heat exchangers and poor heat transfer effects, but the scraped surface heat exchanger can make high-viscosity materials flow smoothly and conduct effective heat exchange through the push of the scraper.

Good hygienic performance

In industries with high hygienic requirements such as food and medicine, the structure design of the scraped surface heat exchanger is easy to clean. Its internal space is relatively open and there are no complex dead corners. During the cleaning process, the scraper also helps to scrape off the residues attached to the wall, thereby meeting strict hygienic standards.

3. Application fields

Food industry

Used in food heating, cooling, sterilization, concentration and other processes. For example, it is used for sterilization and concentration of milk in dairy production, and for making and cooling jam in jam production.

Chemical industry

Handle the heating or cooling process of various high-viscosity chemical raw materials, such as resins and glues, to improve the efficiency and product quality of chemical production.

Pharmaceutical industry

In the extraction, concentration, drying and other processes of drugs, Scraped surface heat exchanger can accurately control the temperature to meet the strict temperature requirements of the pharmaceutical process, while ensuring the quality and hygiene of the drugs.

4. Maintenance and development

The maintenance of Scraped surface heat exchanger is relatively simple. Regularly check the wear of the scraper and replace it, and clean the inner wall of the shell. With the continuous development of industrial technology, Scraped surface heat exchanger is also developing in the direction of more efficiency, energy saving and intelligence, such as using new materials to improve the wear resistance and heat transfer performance of the scraper, and introducing automatic control systems to achieve more accurate temperature and flow control.