Negative pressure concentration total heat type evaporation recovery system

Abstract

The invention provides a negative pressure concentration total heat type evaporation recovery system. The negative pressure concentration total heat type evaporation recovery system comprises a high-temperature heat pump, an air energy heat pump, a circulating heat preservation and storage box, a heater, an evaporator, a preheating tank, a condenser, a plate heat exchanger and a finished product device. The high-temperature heat pump is connected with the circulating heat preservation and storage box and the heater; the air energy heat pump is connected between the high-temperature heat pump and the circulation heat preservation and storage box; the heater is connected with the evaporator and the preheating tank; the evaporator is connected with the condenser and the finished product device; the preheating tank is connected with the plate heat exchanger and the finished product device; the plate heat exchanger is connected with the condenser; and the condenser is connected with the circulating heat preservation and storage box. The reverse Carnot cycle principle is utilized to condense and recover the heat required to be discharged in the concentration technique process, and the heat is used for heating the solution, thereby implementing cyclic utilization of the heat, greatly lowering the energy consumption, lowering the evaporation boiling point and further lowering the energy consumption; and equipment is simple and efficient, a boiler is not needed, and a large amount of carbon emission and operation cost can be reduced.

Description

technical field [0001] The invention relates to the field of concentration systems, in particular to a negative-pressure concentration full-heat evaporation recovery system. Background technique [0002] The concentration process is widely used in pharmaceutical, chemical, food, environmental protection and emission industries. During the concentration process, it is necessary to evaporate most of the water in the solution to obtain a high-concentration solution, then crystallize at low temperature, centrifuge out the crystals, and dry them Get finished granules or finished powder. [0003] The current concentration process adopts atmospheric pressure single-effect evaporation, negative pressure single-effect evaporation, negative pressure double-effect evaporation, negative pressure three-effect evaporation or MVR evaporation. Negative pressure three-effect evaporation equipment is bulky and complex, and still cannot be separated from the boiler, while MVR evaporation is a...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a negative pressure concentration full-heat evaporation recovery system to solve the problem that the prior art MVR evaporation system does not actively obtain external energy during the working process, and the temperature in the evaporator will gradually and slowly drop during continuous operation. It needs external steam to assist the lifting, and the evaporation boiling point is high, the investment in equipment is large, and the boiler needs to be configured

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