Overlapping type two-temperature drying system

Abstract

The invention provides an overlapping type two-temperature drying system. The overlapping type two-temperature drying system is characterized by comprising a low-pressure stage compressor, a low temperature evaporator, a first condensation evaporator, a middle-pressure stage compressor, a second condensation evaporator, a high-pressure stage compressor and a high temperature condenser; and the low-pressure stage compressor is connected with the low temperature evaporator and is connected with the middle-pressure stage compressor through the first condensation evaporator, the middle-pressure stage compressor is connected with the high-pressure stage compressor through the second condensation evaporator, and the high-pressure stage compressor is connected with the high temperature condenser. By means of the overlapping type two-temperature drying system, a high temperature heat source generated in the low temperature making process of the overlapping type system is sufficiently used, and the equipment running cost is reduced; and meanwhile, the heat energy quality can be improved to be used for drying, unfreezing and heat pump heating, the energy resource can be sufficiently used, and energy resource waste is reduced.

Description

technical field [0001] The invention relates to the field of freeze-drying, in particular to a cascade double-temperature drying system. Background technique [0002] Vacuum freeze drying is widely used in various industries due to its excellent drying effect. However, in the practical application of freeze-drying, the investment cost is high and the operating cost is high, which is 3 to 4 times the cost of air-drying, and in freeze-drying, the energy consumption of pre-freezing only accounts for 4%-14% of the energy generated by freeze-drying However, the total energy consumption of vacuum pumps, heating plates, and cold traps in the drying process accounts for 86% to 96%, which greatly reduces the effective utilization rate of freeze-drying energy. Although there are many ways to reduce the energy consumption of freeze-drying in recent years, such as shortening the drying time by optimizing process parameters, improving heat transfer to accelerate sublimation, and avoidin...

AI Technical Summary

Problems solved by technology

However, in the practical application of freeze-drying, the investment cost is high and the operating cost is high, which is 3 to 4 times the cost of air-drying, and in freeze-drying, the energy consumption of pre-freezing only accounts for 4%-14% of the energy generated by freeze-drying However, in the drying process, the total energy consumption of vacuum pumps, heating plates, and cold traps accounts for 86% to 96%, which greatly reduces the effective utilization rate of freeze-drying energy.

Although there are many ways to reduce the energy consumption of freeze-drying in recent years, such as shortening the drying time by optimizing process parameters, improving heat transfer to accelerate sublimation, and avoiding the use of cold traps, the effects of these methods on reducing energy consumption are not satisfactory

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