The energy shortage has attracted worldwide attention. The traditional idea is that the energy consumption of the vacuum dryer is high, because it needs to add a vacuum pump. But I haven't seen the real energy consumption comparison when drying to the same moisture content for the same material. In fact, vacuum drying is low temperature drying in an enclosed space with relatively little energy waste. Nevertheless, the energy saving of vacuum dryers is still the key to development. Compared with other types of drying equipment, the energy-saving focus of vacuum dryers should be on rational design, selection and use of vacuum systems.
There are not many vacuum systems that can pump water vapor. At present, there are two main categories. One is the pump that can directly pump water vapor, mainly including water jet pump, water vapor jet pump, water ring pump and wet Roots pump; Water is captured by condensation. These two methods consume relatively high energy. The direction of the former type of energy saving should be to improve the pumping efficiency of the pump; the direction of the latter type of energy saving is to design the structure and thermal efficiency of the gas-solid phase conversion heat exchanger.
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