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A Closed Heat Pump Drying System with Network Recombination of Multiple Heat Exchangers

A heat pump drying and heat exchanger technology, applied in drying, dryer, heating device and other directions, can solve the problem of not considering air circulation pre-cooling and preheating, etc., to improve dehumidification energy efficiency, reduce cycle pressure ratio, The effect of fast dehumidification

Active Publication Date: 2021-11-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned patent only proposes a specific closed heat pump system structure, and the heat exchanger network used is still relatively simple, without considering the precooling and preheating in the air circulation process, so the closed heat pump drying system is still Potential to further improve system energy efficiency

Method used

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  • A Closed Heat Pump Drying System with Network Recombination of Multiple Heat Exchangers
  • A Closed Heat Pump Drying System with Network Recombination of Multiple Heat Exchangers
  • A Closed Heat Pump Drying System with Network Recombination of Multiple Heat Exchangers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136] The closed heat pump drying system recombined with multi-heat exchanger network in this embodiment includes a heat exchanger network, a drying tunnel, and air circulation, refrigerant circulation and heat pipe circulation connecting each heat exchanger.

[0137] The heat exchanger network includes evaporators, condensers, auxiliary heat exchangers (pre-cooling heat exchangers and pre-heating heat exchangers, outdoor heat exchangers), etc. For a closed drying system, the number of the above-mentioned heat exchangers is not limited. In this patent, a closed drying system with multiple heat exchangers including four pairs of evaporators and condensers is used as an example for illustration. In the case of changing the substantial structure of the heat exchanger network, increasing or decreasing the number of heat exchangers is within the scope of protection of this patent.

[0138] The items to be dried in the drying tunnel 50 move with the conveyor belt, and along the mov...

Embodiment 2

[0162] This embodiment is similar to that of Embodiment 1 in terms of basic principles and component connections, the main difference being that a refrigerant cycle is used instead of a heat pipe cycle to remove waste heat. see image 3 Specifically, the fourth pre-cooling heat exchanger 24 and the fourth pre-heating heat exchanger 34 are connected by refrigerant circulation, and connected to the outdoor heat exchanger 41 as a condenser to remove waste heat from the drying tunnel. Since the air at the end is a deep dehumidification link, the refrigerant evaporation temperature required is the lowest, so the refrigerant cycle for heat dissipation is set at the last stage of the end to improve the energy efficiency of the refrigerant cycle.

[0163] In the present embodiment, the air flow direction and the parts connection of each cycle are as follows:

[0164] Air circulation flow path:

[0165] The first air cycle: drying tunnel return air → first pre-cooling heat exchanger ...

Embodiment 3

[0177] The basic principle and component connections of this embodiment are similar to those of Embodiment 1, and the main difference is that fresh air is used to heat and dehumidify to remove waste heat. see Figure 4 Specifically, the fresh air precooling heat exchanger 42 and the fresh air preheating heat exchanger 43 are used to circulate the refrigerant, the fresh air 51 is heated and sent to the drying tunnel 50 for dehumidification, and the moisture-laden exhaust air is recovered and sent to the Outdoor 52, used to eliminate waste heat in the drying tunnel.

[0178] In the present embodiment, the air flow direction and the parts connection of each cycle are as follows:

[0179] Air circulation flow path:

[0180] The first air cycle: drying tunnel return air → first pre-cooling heat exchanger 21 → first evaporator 1 → first pre-heating heat exchanger 31 → first condenser 11 (mixed with the second condenser 12 split part) →The first air supply port

[0181] The secon...

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Abstract

The invention relates to a closed heat pump drying system recombined with multi-heat exchanger network, which includes a drying channel and a heat exchanger network; the heat exchanger network includes multi-stage heat exchanger components, and each heat exchanger component is matched with Corresponding level of air circulation and refrigerant circulation; there is a transmission unit in the drying tunnel, and the transmission unit transports the items to be dried along the length of the drying tunnel; wherein each level of air circulation is arranged in parallel in turn, and the air circulation of each level is connected with the drying tunnel They are connected through the air supply port to realize the cascade heating and air supply in the length direction of the drying tunnel, so that the temperature and humidity changes in the length direction of the drying tunnel match the temperature and humidity field of the drying characteristics of the items to be dried. Compared with the prior art, the present invention has uniform temperature and humidity field matching, high system energy efficiency, reasonable energy distribution, full utilization, good flexibility, and technical universality.

Description

technical field [0001] The invention relates to a closed heat pump drying system, in particular to a closed heat pump drying system in which multiple heat exchangers are networked and reorganized. Background technique [0002] Closed heat pump drying is a device that uses the reverse Carnot cycle principle to recover the latent heat of condensation while mechanically dehumidifying the humid air, and heat the circulating air to realize the cyclic heating and drying of materials. Because only water is discharged from the closed heat pump drying system, and most of the heat energy in the drying process is recovered, the efficiency is very high. Moreover, its efficiency is completely independent of the outside temperature and humidity, and it maintains high energy efficiency throughout the year, suitable for any climatic conditions. [0003] A simple heat pump drying system has only two heat exchangers, an evaporator for air condensation and dehumidification and a condenser for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B21/00F26B23/00F26B25/00
CPCF26B21/002F26B23/005F26B25/005
Inventor 曹祥成家豪张春路
Owner TONGJI UNIV
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