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Heat pump type double-circulation hot-air drying system and control method thereof

A technology of hot air drying and double circulation, which is applied in drying, heat pumps, dryers, etc., to achieve high heating efficiency and stable product operating conditions

Active Publication Date: 2017-03-22
JIANGSU TENESUN ELECTRICAL APPLIANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a heat pump double-circulation hot air drying system, which is used to solve the technical problems existing when the existing heat pump hot air drying system provides high temperature hot air

Method used

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  • Heat pump type double-circulation hot-air drying system and control method thereof
  • Heat pump type double-circulation hot-air drying system and control method thereof
  • Heat pump type double-circulation hot-air drying system and control method thereof

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Embodiment 1

[0074] An example of a multi-stage temperature control curve and temperature control parameter configuration interface is Figure 8 As shown, the multi-stage temperature control curve in this embodiment is a 10-stage heating curve. The control device 500 controls the double-cycle hot air drying system to realize intelligent and fully automatic operation by configuring the set temperature and temperature stabilization time of each time period. No manual manipulation is required.

[0075] according to Figure 6 As shown in the embodiment of the control method of the heat pump double-circulation hot air drying system of the present invention, the step S400 includes the following control operations:

[0076] S420: If the set temperature is Figure 8 For the 1st to 5th segments of the 10-segment heating curve shown, the set air outlet temperatures are 20°C, 25°C, 30°C, 35°C and 40°C respectively.

[0077] S440: If the set temperature is Figure 8 In the 6th and 7th segments of th...

Embodiment 2

[0081]The size of a tobacco drying room is: 8×2.8×2.2m, and the amount of tobacco leaves to be dried at one time is 350 rods, each rod is 30kg of tobacco leaves, totaling 10500kg. The variable-frequency variable-capacity heat pump hot air drying system is composed of a 6-hp fixed-frequency compressor 1-1 and a 6-hp variable-frequency compressor 1-2 connected in parallel. The maximum heating capacity is 50kW. The variable-frequency and variable-capacity connection structure of the unit is as follows: Figure 4 shown. For the temperature control curve of flue-cured tobacco process, see Figure 9 In the multi-stage drying process diagram shown, the heat consumption in each period is as follows Figure 10 shown. The control device 500 selects an appropriate operation mode through comparative analysis to achieve maximum operation efficiency.

[0082] according to Figure 7 As shown in the embodiment of the control method of the variable frequency and variable capacity heat pump ...

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Abstract

The invention provides a heat pump type double-circulation hot-air drying system and a control method thereof, and relates to supply or control devices for air or gas used for drying solid materials or products, in particular to a heat pump type hot-air drying system and a control method for the system. A hot air cabinet is divided into a basic air temperature area and a reheating area. A latent heat condenser and a sensible heat condenser are connected in series to form a double-section series condenser. An air supply circulation loop enters an air feeder from a drying chamber through an air return duct and the latent heat condenser and is supplied into the drying chamber through an air supply regulating valve, the sensible heat condenser and an air supply duct. An internal circulation loop returns to the air feeder from the air feeder through an internal circulation air valve, an internal circulation air duct, the air return duct and the latent heat condenser. By controlling the opening degrees of the internal circulation air valve and the air supply regulating valve, the internal circulation loop sufficiently absorbs condensation latent heat to increase the basic air temperature, secondary heat exchange is conducted through the air supply circulation loop for producing high-temperature hot air, and thus variation requirements of the outlet air temperature and the temperature of the drying chamber are met; and the heating efficiency of the system is high, and the product operating condition is stable.

Description

technical field [0001] The invention relates to an air or gas supply or control device for drying solid materials or products, in particular to a heat pump type hot air drying system and a control method for the system. Background technique [0002] At present, there are more and more places that need hot air drying in the market, such as tobacco drying, grain drying, medicinal materials drying, fruit and vegetable drying and other drying places. Coal furnaces, gas furnaces and electric furnaces are mainly used for drying. Coal and gas are non-renewable strategic energy sources, which are not the direction of national promotion. Electric furnaces are not suitable for mass promotion because of their high energy consumption and high operating costs. In the past, coal stoves were used to heat hot water in rural areas in the north. The country has comprehensively promoted the use of heat pumps instead of coal stoves in rural areas, which proves that heat pumps still have great m...

Claims

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Application Information

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IPC IPC(8): F26B21/08F26B21/10F25B30/02F25B30/06F25B41/00F25B41/40
CPCF25B30/02F25B30/06F26B21/002F26B21/08F26B21/10F25B41/40
Inventor 王玉军吴运运吴小网季忠海王颖王天舒杨奕
Owner JIANGSU TENESUN ELECTRICAL APPLIANCE
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