1 Heat pump evaporation: At present, heat pump evaporation is widely used in multi-effect evaporation to save steam and reduce heating temperature, and can adapt to the needs of heat sensitive materials. Heat pump evaporation is divided into mechanical heat pump and steam compression heat pump. Due to the complicated structure, high requirements and low use, mechanical heat pumps are widely used in factories as vapor compression heat pumps.
2 Utilization of condensed water: The condensed water in each effect heating chamber in the multi-effect evaporation device is saturated water and contains a large amount of heat. If the pressure difference between the heating chambers of each effect is utilized, the flashing method is adopted, and the condensed water entering the second effect heating chamber can generate flash steam which accounts for 2.5 to 3% of the water, and the steam can be used as the first Two-effect heating source is used.
3 vapor compression heat pump: steam compression heat pump, also known as thermal energy compressor, hot pressure pump, it is a method of using high pressure to induce steam (0.55~0.7) and generating supersonic speed through the nozzle. The high pressure ejector vapor generates a negative pressure. At the same time, part of the secondary steam is drawn in and mixed with it to form a mixed vapor. The mixed steam is used as a heat source by the booster, so that the steam is composed of two parts: one part is steam and the other part is *effect secondary steam, which reduces steam consumption and achieves energy saving. Although the thermal energy compressor has the advantages of simple structure, convenient manufacture, no moving parts, etc., the noise is a major drawback. The noise of the domestically produced thermal compressor is (85~90) dB(A), and the heat energy compression imported from abroad. The noise is (80~85) dB(A).
2 Utilization of condensed water: The condensed water in each effect heating chamber in the multi-effect evaporation device is saturated water and contains a large amount of heat. If the pressure difference between the heating chambers of each effect is utilized, the flashing method is adopted, and the condensed water entering the second effect heating chamber can generate flash steam which accounts for 2.5 to 3% of the water, and the steam can be used as the first Two-effect heating source is used.
3 vapor compression heat pump: steam compression heat pump, also known as thermal energy compressor, hot pressure pump, it is a method of using high pressure to induce steam (0.55~0.7) and generating supersonic speed through the nozzle. The high pressure ejector vapor generates a negative pressure. At the same time, part of the secondary steam is drawn in and mixed with it to form a mixed vapor. The mixed steam is used as a heat source by the booster, so that the steam is composed of two parts: one part is steam and the other part is *effect secondary steam, which reduces steam consumption and achieves energy saving. Although the thermal energy compressor has the advantages of simple structure, convenient manufacture, no moving parts, etc., the noise is a major drawback. The noise of the domestically produced thermal compressor is (85~90) dB(A), and the heat energy compression imported from abroad. The noise is (80~85) dB(A).
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