Double-source closed type efficient and energy-saving drying system

Abstract

The invention discloses a double-source closed type efficient and energy-saving drying system. The double-source closed type efficient and energy-saving drying system is characterized in that the system comprises a drying chamber, a burner, a heat pump and a circulating air pipe; the circulating air pipe comprises an air outlet pipe and an air inlet pipe, the air inlet pipe is connected with an air inlet of the drying chamber, and the air outlet pipe is connected with an air outlet of the drying chamber; the heat pump is arranged on the air inlet pipe, and an air heat exchanger is arranged between the air outlet pipe and the air inlet pipe; and the air heat exchanger is connected with the burner and heated through the burner. A full-automatic constant-temperature high-air-volume low-humidity drying process is adopted by the system, temperature rise is fast since the burner and the heat pump are combined, and drying time is shortened; a dehumidifier of a traditional drying system is replaced by the internal heat pump, so that efficiency is higher and more energy is saved; and the circulating air volume is randomly set in sealed space, and turbulent flow is formed by bottom air guiding and an auxiliary fan, so that no dead corner exists in drying, and the uniform drying effect is guaranteed. Because of closed circulating drying, external pollution is avoided, mosquitoes and dust cannot enter the system easily, and the material quality is guaranteed. No dead angle exists because of strong wind convection, materials do not need to be overturned, and full-automatic control is achieved.

Description

technical field [0001] The invention belongs to the field of high-medium-temperature heat pump drying, and in particular relates to a double-source closed-type high-efficiency and energy-saving drying system. The scope of application is: high and medium temperature heat pump drying and dehumidification. The range of drying and drying items is grain, vegetables and fruits, tobacco leaves, bacon, aquatic products, clothing fabrics, Chinese medicinal materials, wood, peat, various industrial and agricultural raw materials and products, etc. Background technique [0002] The types of material drying are extremely wide and the quantity is huge, and the energy consumption of the whole society for material drying is very huge. According to some data, the energy consumption for drying and drying materials in developed countries accounts for between 7% and 15% of the total energy consumption, with an average of 12%. Now China's annual power generation is about 5 trillion kWh. If th...

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Problems solved by technology

The disadvantage is that the temperature of the air in the oven rises very slowly, and the heat obtained by the inner cavity of the oven is only the heat converted by the energy consumed by the heat pump device. The gas temperature of the evaporator is low, the ratio of latent heat / sensible heat in the heat absorbed by the evaporator is very low, the drying and dehumidification effect is poor, and the drying speed is slow

Especially because the condenser and the evaporator share a fan, when the condensing air volume is the same as the evaporating air volume, if the latent heat absorbed by the evaporator is greater than the sensible heat, the temperature difference between the inlet and outlet air of the condenser is more than 2.5 times the temperature difference between the inlet and outlet air of the evaporator, making the condenser If the air outlet temperature of the condenser is too high, the condensation temperature of the refrigerant is too high, resulting in a decrease in the energy efficiency ratio of the heat pump system; if the latent heat absorbed by the evaporator is less than the sensible heat, although the disadvantage of too high air outlet temperature of the condenser can be avoided, the latent heat / sensible heat is less than 1, Reduce the conversion rate between latent heat and sensible heat of the air in the oven, resulting in poor dehydration effect

The overall effect is equivalent to that of Class A open devices: Class B closed heat pump drying devices can save energy by more than 50% compared with electric heating drying, and the SMER is about 2 to 2.5, and it is difficult to exceed 3, especially in winter, affected by the external temperature. impact, the drying effect is worse

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