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Drying device with combination of heat pump and rotating wheel

A drying device and runner technology, which is used in dryers for static materials, local stirring dryers, drying, etc., can solve the problem of large increase in energy consumption, increase in system energy consumption, and limit the application range of rotary dehumidifiers. and other problems, to achieve the effect of reducing the energy consumption of reheating, reducing the energy consumption of the drying system, and overcoming the deep drying of materials

Inactive Publication Date: 2011-09-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in both cases, the air at the inlet and outlet of the rotary dehumidifier needs to be cooled by a heat exchanger, resulting in an increase in energy consumption of the system. For systems that do not have the conditions to use waste heat regeneration, the increase in energy consumption is even greater.
This limits the application range of the rotary dehumidifier, especially in the application of material drying

Method used

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  • Drying device with combination of heat pump and rotating wheel
  • Drying device with combination of heat pump and rotating wheel

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Adopt the device of the present invention to dry 5kg of fresh jujubes, after cleaning, draining and finishing, the initial moisture content is about 80%, the drying medium is air, the drying temperature is 50°C, the relative humidity is 11.8%, the heat pump working medium is R134a, and the evaporation pressure is 0.66 MPa, condensing pressure 1.69MPa. The lithium chloride dehumidification wheel is used, and the regeneration temperature is 70°C. Stop drying when the water content of jujube drops to about 20%. Compared with heat pump drying, the drying time is shortened by about 10%, and the energy consumption is saved by 40%.

[0032] The drying device of the present invention includes a drying system, a heat pump and a runner regeneration device. The drying system includes a material drying chamber 1, an evaporator 6, a dehumidification wheel 7, a main condenser 3 and a circulation fan 10 connected in sequence, and the circulation fan 10 is connected with the material...

Embodiment 2

[0048] Adopt the device of the present invention to dry pig leather. Pig leather is squeezed, shaved, and washed for 20 minutes. After the treatment, the sample is placed for 2 days. After squeezing, it is divided into 5 pieces of the same size, each piece has a thickness of 0.9mm and a mass of 0.8kg. , the water content is about 60%. The drying medium is air, the drying temperature is 35°C, the relative humidity is 5%, the heat pump working fluid is R290 / R600a, and the parameters are set as follows: condensing pressure and evaporating pressure are 0.65, 0.16MPa, condensing temperature and evaporating temperature are 0, 45°C . The lithium chloride dehumidification rotor is adopted, and the regeneration temperature of the rotor is 80°C. Stop drying when the content of leather drops to 20%. Compared with heat pump drying, the drying time is shortened by about 15%, and the energy consumption is saved by about 40-50%.

Embodiment 3

[0050] Adopt device of the present invention to dry Masson pine, Masson pine thick 20mm, volume 0.1m 3 , the moisture content is about 40%, the drying medium is air, the relative humidity is 15%, and the temperature is 70°C for one hour, then switch to 40°C for 10 minutes, then switch to 70°C, and so on. The working fluid of the heat pump is R32 / R152a, and the parameters are set as follows: the condensing pressure and evaporating pressure are 2.37 and 0.45MPa respectively, and the condensing temperature and evaporating temperature are 80 and 15°C respectively. The lithium chloride dehumidification rotor is used, and the regeneration temperature of the rotor is 70°C. Stop drying when the moisture content of masson pine drops to about 10%. Compared with heat pump drying, the drying time is shortened by about 8-10%, and the energy consumption is saved by about 25-40%.

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Abstract

The invention discloses a drying device with the combination of a heat pump and a rotating wheel, which comprises a material drying chamber (1), an evaporator (6), a dehumidifying rotating wheel (7), a master condenser (3) and a circulating fan (10) which are orderly connected. A pipeline where the master condenser (3) is connected with the circulating fan (10) is provided with a mixing valve (14); the pipeline where the dehumidifying rotating wheel (7) is connected to the master condenser (6) is provided with a temperature control dividing valve (13) which is connected to the mixing valve (14) through the pipeline; and an outlet of the mixing valve (14) is provided with a temperature sensor (15) of which an output end is connected with the temperature control dividing valve (13). The drying device also comprises the heat pump and a rotating wheel regeneration device. The drying device of the invention can greatly reduce the humidity of a drying medium, raise a drying velocity at the same time of realizing the deep drying of a material and reduce drying energy consumption. The temperature of the drying medium is adjusted by adjusting flows of two air flows of the drying medium, sothe requirements of different materials or the same material on different drying temperatures in different drying stages are met under the condition of fixed operational parameters of the heat pump.

Description

technical field [0001] The invention relates to a medium-low temperature drying device suitable for chemical industry, energy, food, agriculture and other industries, in particular to a drying device combined with a heat pump and a runner. Background technique [0002] Drying is widely used in various fields of the national economy, and it is also a process that consumes a lot of energy. In developed countries, about 10% of fuel is used for drying. Among the traditional drying equipment, convection drying is widely used because of its simple structure, convenient operation and strong adaptability, and it is the most widely used drying equipment in production at present. The disadvantage of convection drying is that the thermal efficiency is very low, generally only 30% to 60%. [0003] A heat pump is a device that consumes part of its own energy to absorb heat energy from a low-temperature heat source, making it release heat at a high temperature. The use of heat pump tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B9/06B01D53/26
Inventor 樊栓狮李静杨宏军王燕鸿郎雪梅
Owner SOUTH CHINA UNIV OF TECH
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