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A closed cycle drying system coupled with open absorption heat pump and MVR technology

An absorption heat pump and closed-circuit cycle technology, which is applied in the direction of drying solid materials, drying gas arrangement, drying, etc., can solve the problems that it is difficult to meet the needs of high-temperature heating and low-grade water vapor, so as to improve energy utilization rate, Effects of stable regeneration process and load reduction

Active Publication Date: 2022-03-01
ZHEJIANG UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Absorption heat pump technology is a technology that uses a low-grade heat source to transfer heat from a low-temperature heat source to a high-temperature heat source. However, the system is usually closed and needs to maintain a negative pressure state. The water vapor produced by the generator is of low grade, which is difficult Meet the needs of high temperature heating

Method used

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  • A closed cycle drying system coupled with open absorption heat pump and MVR technology

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Embodiment 1

[0039] In this example, air is used as a dry medium, and the moisture containing water content of 18.3% is dried to a water content of 0.55%, and the amount of feed of wet materials is 1000 kg / h. The air temperature required for the dryer is 130 ° C. Hoate content is 10.7g / kg (绝干气) The flow rate is 3423kg / h, the wet air temperature of the exit is 60 ° C, the moisture content is 63.4 g / kg (绝干气) . The absorbent salt solution is selected from 65% LiBr aqueous LiBr solution. The water supply temperature of the absorber is 60 ° C. The mass flow ratio of the concentrated solution of the absorber and the mass flow ratio of the hot and moisture exhaust gas is 0.475. After the absorption process is completed, the absorber is completed. The concentration of the bottom salt solution becomes 58.9%, the temperature is maintained at 60 ° C, and the top air outlet temperature of the absorber is 60 ° C, the humidity is 10.7 g / kg. (绝干气) The pressure is 101.3 kPa.

[0040] The mechanical ...

Embodiment 2

[0045] In this embodiment, air is used as a medium, and the moisture content of 48% is lowered by spray drying to 3.1%, and the amount of feed material is 1000 kg / h, and the intake temperature of the dryer is 240 ° C, and humidity 11.7g / kg (绝干气) The flow rate is 12113kg / h, the wet air temperature of the exit is 75 ° C, the moisture content is 50.4 g / kg. (绝干气) . The moisture absorbent salt solution is selected from 65% LiBr aqueous LiBr solution, and the water supply temperature of the absorber is 60 ° C. The mass flow ratio of the concentrated solution of the absorber is 0.144, and after the absorption process is completed, the absorber is completed. The concentration of the bottom salt solution becomes 51.8%, the temperature is maintained at 60 ° C, and the top air outlet temperature of the absorber is 60 ° C, the humidity is 11.7 g / kg. (绝干气)， The pressure is 101.3 kPa.

[0046] The mechanical compression heat pump circulation system employs a high temperature solution ...

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Abstract

This application discloses a closed-circuit drying system coupled with open absorption heat pump-MVR technology, including an open absorption heat pump system and a mechanical compression heat pump circulation system. The outlet of the mechanical heat pump compressor is divided into two paths, one of which passes through the condenser The hot channel of the heat exhaust device is connected to the hot channel inlet pipeline of the heat exhaust device, and the other channel is connected to the hot channel inlet of the heat exhaust device through the 2# heat mass exchanger; the hot channel outlet of the heat exhaust device is connected to the expansion valve by a pipeline , the outlet of the expansion valve is divided into two paths, one path is connected to the inlet of the mechanical heat pump compressor through the 1# heat-mass exchanger, and the other path is connected to the inlet of the mechanical heat pump compressor through the cold channel of the evaporator to form a mechanical compression type heat pump cycle system. This application uses the absorbed heat for the regeneration of the dilute solution through the mechanical compression heat pump circulation system, and uses the MVR technology to improve the grade of the regeneration steam and then use it for heating the dry gas. The invention can rationally use the dryer to discharge a large amount of latent heat in the hot and humid gas .

Description

Technical field [0001] The present invention relates to the field of drying energy saving and emission reduction, in particular, relating to a closed circuit circulation drying system coupled to an open absorbent heat pump-MVR technology. Background technique [0002] The drying process is widely used in the fields of chemical, pharmaceutical, food, paper, wood, and food. The conventional closed-circuit looping system uses a condensed dehumidification, first cooling the hot moisture medium to the dew point temperature to remove the moisture below, and then heat the low-temperature and low-humid media to the drying temperature, this manner is caused Very large energy loss and a large amount of latent heat fail to be utilized. [0003] Adsorption dehumidification is absorbing moisture through the adsorbent, although dehumidification efficiency is high but does not function for high temperature dry exhaust. The heat-insulating solution is generally used by the filler tower, and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B21/00F26B23/00F26B25/00F25B15/06
CPCF26B21/001F26B23/004F26B25/005F25B15/06Y02A30/27Y02B30/62Y02P70/10
Inventor 程榕黄小葆郑燕萍杨阿三孙勤李琰君贾继宁屠美玲
Owner ZHEJIANG UNIV OF TECH
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