A switchable waste heat recovery heat pump drying device and its operation method
A heat pump drying and waste heat recovery technology, which is used in heat recovery systems, drying gas layout, dryers for static materials, etc. Reduce energy consumption for cooling and dehumidification, improve operating efficiency, and solve the effect of slow heating
Active Publication Date: 2019-10-01
ZHEJIANG UNIV
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Problems solved by technology
Common heat pump drying systems can be divided into open systems, closed systems, and semi-open systems, etc., each of which has applicable environmental conditions. Most heat pump drying systems cannot guarantee good energy-saving performance in the full range of working conditions.
In addition, the serious waste of waste heat from dehumidified exhaust gas and the slow temperature rise during startup are also common problems in current heat pump drying equipment.
Method used
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Embodiment Construction
[0049] A preferred embodiment of the present invention provides a waste heat recovery type heat pump drying device with switchable modes, such as Figure 1 ~ Figure 3 As shown, the unit contains a heat pump system and an air handling system.
[0050] The heat pump system includes a compressor 2, a condenser 3, an evaporator 4, an auxiliary heat exchanger 5, an economizer 6, a first throttling device 7, a second throttling device 8 and a flow regulating valve 9; the economizer 6 has Two runners.
[0051] The heat pump system is connected as follows:
[0052] The exhaust port of the compressor 2 is connected to the inlet of the flow regulating valve 9, the suction port of the compressor 2 is connected to the outlet of the evaporator 4, and the middle gas injection port of the compressor 2 is connected to the outlet of the evaporator 4. The second runner outlet of the above-mentioned economizer 6 is connected;
[0053]The inlet of the condenser 3 is connected with the outlet o...
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The invention discloses a mode switchable waste heat recovery type heat pump drying device and an operation method thereof. The device comprises a heat pump system and an air processing system; the heat pump system comprises a compressor, a condenser, a throttling device, an evaporator, an economical device, an auxiliary heat exchanger, a flow regulating valve and a connecting pipeline; and the air processing system comprises a drying chamber, two heat recycling devices, two fans, six electric air valves and the connecting pipeline. According to the device and the method, the two heat recycling devices are added into a conventional heat pump drying system, so that the multi-stage recovery of dry waste heat is realized; and the six electric air valves are further arranged, so that the switching of a plurality of operation modes can be realized, and the energy-saving performance of the device in a full-working-condition range is ensured.
Description
technical field [0001] The invention relates to the field of heat pump drying, in particular to a waste heat recovery type heat pump drying device with switchable modes and an operating method thereof. Background technique [0002] Hot air drying is the most common drying method in mechanical drying, which has the advantages of large material handling capacity and low equipment cost. According to the different forms of heat sources, hot air drying can be divided into coal-fired drying, firewood drying, heat pump drying, solar drying, etc. The drying process of coal and firewood is high energy consumption and high pollution. In addition, the degree of automation of the drying process of coal and firewood is low, and the drying process cannot be precisely controlled, resulting in the quality of the dried material cannot be guaranteed. Solar drying also has the problem of unstable heat source . Heat pump drying has gradually become the main application method in the drying fi...
Claims
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IPC IPC(8): F26B9/06F26B21/08F26B21/10
CPCF26B9/06F26B21/002F26B21/086F26B21/10Y02B30/52Y02P70/10
Inventor 范誉斌张学军赵阳李婷婷张荔喆张春伟
Owner ZHEJIANG UNIV