Isothermal dual-effect concentration unit and concentration method thereof

Abstract

The invention discloses an isothermal dual-effect concentration unit and a concentration method thereof. The isothermal dual-effect concentration unit comprises a dual-effect concentration system and a secondary steam recompression system, wherein the dual-effect concentration system sequentially comprises a raw material tank, a preheating unit, an isothermal concentration tower body, an integrated dual-effect heater and a paste collecting tank from upstream to downstream, wherein a secondary steam collecting cavity is formed between the isothermal concentration tower body and the integrated dual-effect heater; an I-effect tube pass I and an I-effect tube pass II are used as film falling concentration modules, and an II-effect tube pass I is used as a forced circulation concentration module. The film falling concentration modules and the forced circulation concentration module are integrated; compared with an existing single-function concentrator, two concentrators of a film falling concentrator and a forced circulation concentrator are not required to be arranged, so that input cost and occupied space are saved; a separation tank is not required to be arranged, so that conveying pipelines among effect tube passes are omitted; each module can be used for independently regulating the concentration speed and the concentration amount of each tube pass so as to adapt to different production requirements, and the using flexibility is increased.

Description

technical field [0001] The invention relates to the technical field of concentration and evaporation equipment, in particular to an isothermal double-effect concentration unit and a concentration method thereof. Background technique [0002] At present, the liquid concentration and evaporation technologies used in medicine and food mainly include falling film concentration and forced circulation concentration. Falling film concentration is to add the feed liquid from the upper tube box of the heating chamber of the falling film evaporator, and distribute it evenly into each heat exchange tube through the liquid distribution and film forming device, and form a uniform film from top to bottom under the action of gravity and air flow Flow; and forced circulation concentration is to use the circulation pump to force the liquid to flow in the equipment. Falling film concentration has low energy consumption but is easy to scale, while forced circulation concentration is not easy ...

AI Technical Summary

Problems solved by technology

Falling film concentration has low energy consumption but is easy to scale, while forced circulation concentration is not easy to scale but consumes a lot of energy

Therefore, in actual production, multiple falling film evaporators and multiple forced circulation evaporators are often set up for comprehensive use, but the investment cost is high, and a large number of separation tanks and pipelines need to be installed, which takes up a lot of space and is not suitable for small batch production.

Moreover, because the Chinese herbal medicine extract contains some macromolecular substances (such as polysaccharides, starch, colloid, etc.), particulate dirt and biological fouling mixture, etc., the Chinese herbal medicine solution is very easy to condense and cause scaling, and it is not suitable for falling film concentration. For Chinese herbal medicine extracts, use more energy-intensive forced circulation concentration

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