Vertical scraped film evaporator with multi-stage swirling feed

Abstract

The invention relates to a vertical scraped film evaporator with multi-stage swirling feed, which comprises an evaporation barrel with a liquid phase discharge port at a lower end, a transmission device arranged on the evaporation barrel and a heating jacket provided outside the evaporation barrel. The transmission device drives a transmission shaft penetrating through the interior of the evaporation barrel, and a first feed port and a plurality of second feed port are sequentially formed from the top to the bottom on the outer wall of the evaporation barrel along the axial direction, a liquiddistributor for feeding the first feed port is fixed on the transmission shaft, and rotary scrapers are arranged below the liquid distributor, the transmission shaft is provided with a plurality of rotary scrapers corresponding to each of the second feed ports, and the outer wall, on which each of the second feed ports is located, of the evaporation barrel is uniformly provided with a plurality of third feed ports along the outer circumferential direction thereof. The evaporator of the invention can improve the liquid film flow pattern distribution inside the rotary scraper evaporator effectively and adjust the concentration gradient of the concentrated material by setting a plurality of feed ports for segmented liquid distribution, avoid the phenomenon of channeling and material stickingwall, and improve the actual evaporation efficiency of the rotary scraper evaporator.

Description

technical field [0001] The invention relates to the field of a wiped-film evaporation device, in particular to a vertical wiped-film evaporator with multi-stage swirl feed. Background technique [0002] Inside the existing vertical wiped film evaporator, the material flows in from the upper feed port of the vertical evaporator, and the liquid distributor fixed on the transmission shaft rotates the liquid distribution, and the material liquid is thrown to the inner wall of the cylinder to form a liquid film. Under the action of gravity and the circumferential scraping force of the rotating scraper, the film flows downward in a spiral shape along the inner wall of the cylinder, and then forms an evaporation film on the inner wall of the cylinder. The spiral trajectory of the liquid increases the residence time on the inner wall of the cylinder, ensuring effective evaporation. However, experiments and numerical simulations show that due to the influence of gravity, the thickne...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the object of the present invention is to provide a vertical wiped film evaporator that improves the actual evaporation efficiency of the rotary scraped evaporator and avoids the multi-stage swirl feed in harsh working conditions, so as to solve the existing problems. Problems such as low efficiency caused by unrestricted liquid film flow patterns and large concentration gradients in the technology

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