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An air source large temperature span high temperature heat pump drying system

A high-temperature heat pump and drying system technology, applied in heat recovery systems, heat pumps, drying, etc., can solve the problems of difficult realization and high cost of heat pump single-stage compression

Active Publication Date: 2020-10-27
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, heating air at room temperature to the temperature required for high-temperature drying at 80-100°C is difficult to achieve with conventional heat pump single-stage compression.
Although using CO 2 Transcritical heat pumps can provide the heat required for high-temperature drying at 80-100°C, but their operating pressure often reaches above 10MPa, requiring special compressors and corresponding components, which are expensive

Method used

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  • An air source large temperature span high temperature heat pump drying system
  • An air source large temperature span high temperature heat pump drying system
  • An air source large temperature span high temperature heat pump drying system

Examples

Experimental program
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Effect test

Embodiment 1

[0041] see figure 1 For Embodiment 1 of the present invention, a schematic structural diagram of a heat pump drying system with air source, large temperature span, and high temperature is provided. For the convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows.

[0042] The air source large temperature span high temperature heat pump drying system provided by the present invention includes: a compressor 1, a fan 7, a drying chamber 8, an evaporator 6, a condenser 2, a regenerative heat exchanger 3, a first throttling element 4, a second Two throttling elements 20, the first stop valve 9, the second stop valve 10, the third stop valve 12, the fourth stop valve 14, the fifth stop valve 16, the sixth stop valve 17, the seventh stop valve 18, the eighth stop valve The shut-off valve 19 , the first condensate-trap separator 11 , the second condensate-trap separator 5 , the first drain valve 13 and the ...

Embodiment 2

[0057] see figure 2 , is a schematic diagram of the preheating mode of the air source large temperature span high temperature heat pump system provided by an embodiment.

[0058] The air source large temperature span high temperature heat pump drying system includes a preheating mode, and the working mode of the preheating mode is as follows:

[0059] The first shut-off valve 9 is opened, the fifth shut-off valve 16 is opened, the seventh shut-off valve 18 is opened, the second shut-off valve 10 is closed, the third shut-off valve 12 is closed, the fourth shut-off valve 14 is closed, and the sixth shut-off valve 17 is closed , the eighth shut-off valve 19 is closed, the second liquid discharge valve 15 is closed, the high-temperature working fluid discharged from the high-pressure outlet of the compressor 1 enters the condenser 2 to heat the air through the fifth shut-off valve 16, and then enters the The regenerative heat exchanger 3 passes through the first throttling elem...

Embodiment 3

[0063] see image 3 , is a schematic diagram of the non-winter operation mode of the air source large temperature span high temperature heat pump system provided by an embodiment.

[0064] The air source large temperature span high temperature heat pump drying system includes a non-winter drying operation mode, and the non-winter drying operation mode works as follows:

[0065]The first shut-off valve 9 is closed, the third shut-off valve 12 is closed, the sixth shut-off valve 17 is closed, the eighth shut-off valve 19 is closed, the first liquid discharge valve 13 is closed, and the second shut-off valve is closed. The liquid discharge valve 15 is closed, the second shut-off valve 15 is opened, the fourth shut-off valve 14 is opened, the fifth shut-off valve 16 is opened, the seventh shut-off valve 18 is opened, and the high-pressure outlet of the compressor 1 The discharged high-temperature working fluid enters the condenser 2 to heat the air through the fifth cut-off valve...

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Abstract

An air source large temperature span high temperature heat pump drying system, comprising: a compressor, a fan, a drying chamber, an evaporator, a condenser, a heat recovery heat exchanger, a first throttling element, a second throttling element, a first cut-off valve, second stop valve, third stop valve, fourth stop valve, fifth stop valve, sixth stop valve, seventh stop valve, eighth stop valve, first condensate trap separator, second condensate trap The separator, the first liquid discharge valve and the second liquid discharge valve, the air source large temperature span high temperature heat pump drying system provided by the present invention, utilizes the phase change temperature slip characteristic of the mixed working fluid, and introduces the regenerative heat exchanger to realize Large temperature span and high-efficiency heat supply, using conventional compressor single-stage compression to provide the heat required for high-temperature drying, high drying temperature, low dehydration temperature, high dehydration efficiency, simple process and low cost.

Description

technical field [0001] The invention relates to the technical field of heat pump drying, in particular to an air source large temperature span high temperature heat pump drying system. Background technique [0002] High-temperature drying is widely used in wood production, medicinal material production, food production and other fields to ensure the quality of products by reducing the moisture content in raw materials. Controlling the temperature required for drying and ensuring the drying quality of products is the key to drying technology. High temperature drying can increase the drying rate of products and is an important technical means to improve drying efficiency. [0003] Heat pump drying is a clean and efficient drying method that absorbs heat from the environment by consuming a small amount of electricity and converts it into high-temperature heat required for drying. However, heating air at normal temperature to the temperature required for high-temperature drying...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B23/00F25B30/02F25B30/06F25B41/04F25B47/02F25B41/24F25B41/30
CPCY02B30/52
Inventor 公茂琼孙守军郭浩赵延兴
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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