Drying system based on CO2 transcritical heat pump cycle

Abstract

The invention relates to the technical field of heat pump drying, in particular to a drying system based on a CO2 transcritical heat pump cycle. The system comprises a drying chamber, a refrigerant loop and a drying medium loop. A compressor, a gas cooler, a regenerator, a throttling valve and an evaporator are sequentially arranged on the refrigerant loop. The gas cooler, the drying chamber, a heat exchanger and the evaporator are arranged on the drying medium loop. The heat exchanger comprises first pipelines and second pipelines which mutually exchange heat. An air outlet of the gas cooler communicates with an air inlet of the drying chamber. An air outlet of the drying chamber communicates with inlets of the first pipelines. Outlets of the first pipelines communicate with an air inlet of the evaporator. An air outlet of the evaporator communicates with inlets of the second pipelines. Outlets of the second pipelines communicate with an air inlet of the gas cooler. According to the drying system based on the CO2 transcritical heat pump cycle, the transcritical cycle is adopted, the drying system can adapt to the drying work conditions within the wider temperature range, recycling is conducted on waste heat, and the energy efficiency is improved greatly.

Description

technical field [0001] The invention relates to the technical field of heat pump drying, in particular to a CO-based 2 Drying system with transcritical heat pump cycle. Background technique [0002] The main energy loss in the drying process is the emission of humid air. The drying of materials is a widely used and energy-intensive process in industrial and agricultural production. According to statistics, in most developed countries, the energy consumed by drying materials accounts for about 10% of the total energy in the country. The consumption is 7% to 15%, while the thermal efficiency is only 25% to 50%. Since the energy crisis in the early 1970s, countries all over the world have carried out a lot of research on energy-saving drying technology. Heat pump drying is a new type of energy-saving drying technology under this background. [0003] The heat pump can effectively recover the latent and sensible heat in the humid air, significantly improving energy utilization....

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Problems solved by technology

[0004] But most of the refrigerants (refrigerants) used in the existing heat pump drying system are HFCs and HCFCs, Freon has a destructive effect on the earth's atmospheric ozone, and a large amount of use will cause global warming and seriously affect the earth's ecological environment; and, the existing The temperature range of the refrigeration working medium is narrow, and it is difficult to meet the drying requirements under high-temperature conditions. Under low-temperature conditions, the performance of the heat pump will be reduced, and it may not even operate normally, which seriously hinders the popularization and application of heat pumps in high-temperature and cold regions.

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