A Rotary Rising Film Evaporator

Abstract

The invention relates to the technical field of evaporators, and discloses a rotary rising film evaporator, which includes an outer sealed tank, a middle feed liquid tank is fixedly installed inside the outer seal tank, and the bottom of the inner cavity of the middle feed liquid tank The right side is fixedly installed with a blocking base. Through the eccentric setting of the heating rotary tank inside the middle material liquid tank, during the rotation process of the heating rotary tank, the flat plate is used to compress the space between the heating rotary tank and the middle material liquid tank, and the liquid film and the generated steam are squeezed. pressure to accelerate the rising rate of the generated steam and liquid film, thereby improving production efficiency. At the same time, through the setting of the flat plate, it will continue to contact the inner wall of the middle material and liquid tank under the pressure of the rotating centrifugal force of the heating rotary tank and the pressure of high-temperature steam, thereby improving the production efficiency. The crystals precipitated from the feed liquid on the inner wall of the middle feed liquid tank are scraped off to reduce the residue of scaling, improve the heat exchange efficiency, and increase the scope of application of the evaporator.

Description

technical field [0001] The invention relates to the technical field of evaporators, in particular to a rotary rising film evaporator. Background technique [0002] Rising film evaporator, the feed liquid is preheated to the boiling point, added from the bottom of the heating chamber, and strongly vaporized in the heating tube, so that the generated steam drives the feed liquid to rise in a film-like evaporator along the tube wall, and the liquid film continues during the rising process Evaporation, the feed liquid only needs to pass through the heating tube once to reach the required concentration, but this kind of evaporator is suitable for thin feed liquid and heat-sensitive materials with low concentration, and cannot be used for high concentration, high viscosity and easy crystallization, scaling suitable for materials, for example, there will be a large amount of CO in the production process of alumina 2 Enter, so that the sodium aluminate feed liquid has a reverse cau...

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Problems solved by technology

[0002] Rising film evaporator, the feed liquid is preheated to the boiling point, added from the bottom of the heating chamber, and strongly vaporized in the heating tube, so that the generated steam drives the feed liquid to rise in the form of a film along the tube wall, and the liquid film continues during the rising process Evaporation, the feed liquid only needs to pass through the heating tube once to reach the required concentration, but this kind of evaporator is suitable for thin feed liquid and heat-sensitive materials with low concentration, and cannot be used for high concentration, high viscosity and easy crystallization, scaling suitable for materials, for example, there will be a large amount of CO in the production process of alumina 2 Enter, so that the sodium aluminate feed liquid has a reverse causticization effect, Na 2 CO 3 The content gradually increases, when the Na in the evaporator 2 CO 3 When approaching or exceeding the equilibrium concentration in its feed liquid, Na 2 CO 3 A large amount of precipitation will be deposited on the heat exchange surface, resulting in fouling of the heating tube wall, reducing the heat transfer effect and causing the evaporator to be blocked

[0003] At the same time, when the rising film evaporator is in use, its feed liquid is squeezed by the generated steam, and a liquid film is formed on the tube wall. In order to ensure the formation of the liquid film and ensure the transmission of the feed liquid, it is necessary to release the generated steam The speed is controlled to ensure the pressure in the heating tube and the extrusion force on the liquid, but it limits the evaporation efficiency

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