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A control method and control device for a variable frequency variable capacity heat pump hot air drying system

A technology of hot air drying and control method, which is applied in the directions of drying, dryer, drying gas arrangement, etc., to achieve the effect of reducing energy consumption, ensuring reliability and improving energy efficiency

Active Publication Date: 2019-07-12
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 hot air drying system with variable frequency and variable capacity, 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 control method and control device for a variable frequency variable capacity heat pump hot air drying system
  • A control method and control device for a variable frequency variable capacity heat pump hot air drying system
  • A control method and control device for a variable frequency variable capacity heat pump hot air drying system

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Embodiment 1

[0071] 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.

[0072] according to Image 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:

[0073] 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.

[0074] S440: If the set temperature is Figure 8 In the 6th and 7th segments of the...

Embodiment 2

[0078] 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.

[0079] 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 control method and control device for a frequency-variable variable-capacity heat pump hot air drying system, relating to an air or gas supply or control device for drying solid materials or products, in particular to a control method and a control device for a heat pump hot air drying system , including the following steps: configure temperature control parameters, save the preset temperature control curve parameters; detect and monitor the outlet air temperature and the temperature and humidity of the drying room; dynamically set the demand for heat consumption in the current period according to the preset temperature control curve; The heat consumption selects the dual-machine variable-capacity operation mode of the system. The control device of the present invention uses a microprocessor to realize program control, dynamically connects the evaporation side and the condensation side of the two systems of fixed frequency and frequency conversion by controlling the solenoid valve group, and realizes the variable capacity control of the heat pump unit. Reasonable allocation of the heat exchange area of ​​the evaporator and condenser can not only ensure the reliability of the product, but also achieve the purpose of improving the energy efficiency of the unit and reducing energy consumption.

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 and control device 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B21/00
CPCF26B21/002
Inventor 王玉军吴运运吴小网刘军王颖王天舒杨奕
Owner JIANGSU TENESUN ELECTRICAL APPLIANCE
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