Multi-energy complementary heat pump drying device suitable for low-temperature working condition

Abstract

The invention discloses a multi-energy complementary heat pump drying device suitable for a low-temperature working condition. The device comprises a refrigerant loop, a water loop and an air loop. When the device operates, especially under the low-temperature working condition in winter, hot water prepared by solar energy is sent to a second evaporator to heat a refrigerant to provide an auxiliary heat source for a heat pump, the total heat production amount of the heat pump is increased, and the technical problem that the heat pump is low in efficiency under the low-temperature working condition is solved; and in addition, solar energy is provided for independent heat supply, a heat pump condenser and a gas-water heat exchanger are simultaneously or independently put into operation to heat and dry air, and the purpose of drying in multiple modes and multiple energy sources is achieved. The invention provides a novel multi-energy complementary drying system suitable for the low-temperature working condition based on solar energy and the heat pump, through combined utilization of the heat pump and the solar energy, the operation efficiency of heat pump drying is further improved, electric energy consumption is reduced, and pollutant emission is reduced.

Description

technical field [0001] The invention relates to a multi-energy complementary heat pump drying device suitable for low-temperature working conditions, which belongs to the field of comprehensive energy utilization. Background technique [0002] Heat pump drying has been widely used in more and more fields because of its energy saving and environmental protection characteristics. Although heat pump drying has high operating efficiency, it still requires a large amount of electric energy. The promotion and application of heat pump drying in various fields will lead to an increase in electricity demand, especially during the peak period of electricity consumption when a large number of heat pump drying systems are put into operation. The sharp increase affects other electricity demand and increases the peak-to-valley difference in power load. on the other hand. Since most of my country's electricity production (about 70%) is coal-fired thermal power generation, a large amount ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a multi-energy complementary heat pump drying device suitable for low-temperature working conditions, which solves the technical problem of low thermal efficiency of the existing heat pump drying device under low-temperature working conditions in winter. Complementary to improve drying efficiency

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