Rotary climbing film evaporator

Abstract

The invention relates to the technical field of evaporators, and discloses a rotary climbing film evaporator, which comprises an outer sealing tank, wherein a middle feed liquid tank is fixedly mounted in the outer sealing tank, and a plugging base is fixedly mounted on the right side of the bottom of an inner cavity of the middle feed liquid tank. The heating rotary tank is eccentrically arrangedin the middle material liquid tank; therefore, the heating rotary tank can rotate in the rotating process, so that the space between the heating rotary tank and the middle feed liquid tank is compressed by the flat plate, and the liquid film and the generated steam can be compressed so as to increase the rising speed of the generated steam and the liquid film; meanwhile, due to the arrangement ofthe flat plate, the flat plate is in continuous contact with the inner wall of the middle feed liquid tank under the rotating centrifugal force of the heating rotating tank and the pressure of high-temperature steam, then crystals separated out of feed liquid on the inner wall of the middle feed liquid tank are scraped off, scaling residues are reduced, the heat exchange efficiency is improved, and the application range of the evaporator is widened.

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 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 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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