A kind of isothermal double-effect concentrating unit and concentrating method thereof

Abstract

The invention discloses an isothermal double-effect concentrating unit and its concentrating method, comprising a double-effect concentrating system and a secondary vapor recompression system. The double-effect concentrating system sequentially includes a raw material tank, a preheating unit, an isothermal concentrating system from upstream to downstream The tower body, the one-body double-effect heater and the ointment collecting tank; the secondary steam collecting chamber is formed between the isothermal concentration tower body and the same-body double-effect heater; Membrane concentration module, said II effect I tube process is a forced circulation concentration module. The integrated falling film concentration module and forced circulation concentration module are different from the existing single-function concentrators. There is no need to set up two kinds of concentrators, the falling film concentrator and the forced circulation concentrator, which saves the input cost and occupied space. There is no need to set up a separation tank. To remove the conveying pipeline between each effect process; and each module can independently adjust the concentration speed and concentration of each tube process to adapt to different production requirements and improve the flexibility of use.

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 evenly distribute it into each heat exchange tube through the liquid distribution and film forming device, under the action of gravity and airflow, form a uniform film from top to bottom. The forced circulation concentration uses a circulating 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 to scale but con...

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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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