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A heat pump double-circulation hot air drying system and its control method

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

Active Publication Date: 2022-03-01
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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  • A heat pump double-circulation hot air drying system and its control method
  • A heat pump double-circulation hot air drying system and its control method
  • A heat pump double-circulation hot air drying system and its control method

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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

A heat pump double-cycle hot air drying system and its control method, relating to an air or gas supply or control device for drying solid materials or products, in particular to a heat pump hot air drying system and a control method for the system , the hot air cabinet is divided into the basic air temperature zone and the reheating temperature zone; the latent heat condenser and the sensible heat condenser are connected in series to form a double-section series condenser; the air circulation loop enters the blower from the drying room through the return air duct and the latent heat condenser , sent into the drying room through the air supply regulating valve, sensible heat condenser and air supply duct; the internal circulation loop returns from the supply fan to the supply fan through the internal circulation air valve, internal circulation air duct, return air duct and latent heat condenser; Control the opening of the internal circulation air valve and the air supply regulating valve, the internal circulation loop fully absorbs the latent heat of condensation to increase the basic air temperature, and produces high-temperature hot air through the secondary heat exchange of the air supply circulation loop to ensure the temperature change of the air outlet temperature and the drying room; The heating efficiency of the system is high, and the working condition of the product 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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Patent Type & Authority Patents(China)
IPC IPC(8): F26B21/08F26B21/10F25B30/02F25B30/06F25B41/40
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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