Heat pump drier

A technology of heat pump drying and drying chamber, which is used in heat pump, drying gas arrangement, drying and other directions

Inactive Publication Date: 2008-07-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current application of the heat p

Method used

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  • Heat pump drier

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Example Embodiment

[0009] The following takes the drying of cabbage seeds as a specific example to further illustrate the content of the present invention:

[0010] The cabbage seeds of the dried material are placed on the conveyor belt in the drying chamber. The initial water content of the cabbage seeds is 30%, and it is dried and dehydrated to a water content of 5%.

[0011] After compressor 1 is turned on, CO 2 The working fluid is compressed by the compressor 1 to a high temperature and high pressure working fluid with a pressure of 9MPa and a temperature of 75°C, and then enters the air source gas cooler 2-1 for the first cooling down to 45°C; at the same time, the temperature is 30°C and humidity is 80% The air is heated to a temperature of 45℃, the humidity drops to 35%, CO 2 After the working fluid exchanges heat with the air, it enters the second air source gas cooler 2-2 for the second cooling down to 25°C, while heating the air with a temperature of 20°C and a humidity of 100% to 35°C, a...

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Abstract

The invention discloses a heat pump drying machine with high-efficient and environmentally friendly CO2 as the working fluid. The high-pressure side of a compressor is connected with the working fluid sides of two air source-based gas coolers in series and then connected with an inner heat exchanger, and the high-pressure working fluid side of the inner heat exchanger is connected with the low-pressure working fluid side of the inner heat exchanger via an electronic expansion valve and an evaporator and then connected with the low-pressure side of the compressor, so as to form a working fluid circulating system. The air side of the evaporator is connected with the second air source-based gas cooler in series and then connected with the inlet of a first drying room, the outlet of the first drying room is connected with the first air source-based gas cooler in series and then connected with the inlet of a second drying room, the outlet of the second drying room is connected with an external heat exchanger in series and then connected with the air side inlet of the evaporator, so as to form an air circulating system. The invention takes advantage of the heat exchange characteristics of the heap pump with CO2 as the working fluid with two-stage drying design, and reduces the temperature of the working fluid at the outlet of the gas cooler, so as to reasonably utilize energy, perform continuous drying and shorten drying time.

Description

technical field [0001] The invention belongs to drying equipment, in particular to a device for drying by means of a heat pump. Background technique [0002] Heat pump drying equipment has developed rapidly due to its characteristics of being closed, clean, high utilization rate of primary energy, high heating temperature, and easy capacity adjustment. However, the current application of the heat pump dryer system is a conventional working fluid. The working fluids commonly used in the refrigeration heat pump industry are CFCs (chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons). Because of their damaging effects on the ozone layer and their greenhouse effect, scientists around the world are focusing on their alternatives. Among them, carbon dioxide has been reintroduced into the refrigeration and heat pump industry due to its excellent environmental protection characteristics, good heat transfer and flow properties. At present, the natural working substance CO 2 Kn...

Claims

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Application Information

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IPC IPC(8): F26B21/04F26B23/10F25B30/02
Inventor 李敏霞马一太苏维诚
Owner TIANJIN UNIV
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