Unlock instant, AI-driven research and patent intelligence for your innovation.

Open type absorption heat pump-MVR technology coupled closed cycle drying system

An absorption heat pump and closed-circuit cycle technology, which is applied in the directions of drying solid materials, drying gas arrangement, drying, etc., can solve the problems of low water vapor grade and difficulty in meeting the needs of high-temperature heating, and achieve low water vapor partial pressure and increase Effect of energy utilization and load reduction

Active Publication Date: 2020-11-17
ZHEJIANG UNIV OF TECH +1
View PDF19 Cites 6 Cited by
  • Summary
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Open type absorption heat pump-MVR technology coupled closed cycle drying system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In this example, air is used as the drying medium, and the wet material with a water content of 18.3% is dried to a water content of 0.55% by a fluidized bed. The feed rate of the wet material is 1000kg / h, and the air temperature required by the dryer is 130°C The moisture content is 10.7g / kg (绝干气) , the flow rate is 3423kg / h, the outlet humid air temperature is 60°C, and the moisture content is 63.4 g / kg (绝干气) . The hygroscopic salt solution is LiBr aqueous solution with a mass fraction of 65%. The liquid inlet temperature of the absorber is 60°C. The concentration of the salt solution at the bottom becomes 58.9%, the temperature is maintained at 60°C, the air outlet temperature at the top of the absorber is 60°C, and the humidity is 10.7g / kg (绝干气) , the pressure is 101.3kpa.

[0040] The mechanical compression heat pump circulation system uses high-temperature working fluid R123, the evaporation temperature is 55°C, the condensation temperature is 125°C, the actual...

Embodiment 2

[0045] In this example, air is used as the medium, and the wet material with a water content of 48% is dried to 3.1% by spray drying. The amount is 11.7g / kg (绝干气) , the flow rate is 12113kg / h, the outlet humid air temperature is 75°C, and the moisture content is 50.4 g / kg (绝干气) . The hygroscopic salt solution is LiBr aqueous solution with a mass fraction of 65%. The liquid inlet temperature of the absorber is 60°C. The concentration of the salt solution at the bottom becomes 51.8%, the temperature is maintained at 60°C, the air outlet temperature at the top of the absorber is 60°C, and the humidity is 11.7g / kg (绝干气)， The pressure is 101.3kpa.

[0046] The mechanical compression heat pump circulation system uses high-temperature working fluid R245fa, the evaporation temperature is 55°C, the condensation temperature is 120°C, the actual heating COP reaches 3.22, and the heat removal device uses water cooling, which can obtain 2.95 tons of 100°C boiling water per hour.

[004...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an open type absorption heat pump-MVR technology coupled closed cycle drying system which comprises an open type absorption heat pump system and a mechanical compression heat pump cycle system. An outlet of a mechanical heat pump compressor is divided into two paths, one path is in pipeline connection with a hot channel inlet of a heat removal device through a hot channel of a condenser, and the other path is in pipeline connection with the hot channel inlet of the heat removal device through a 2# heat and mass exchanger; and a hot channel outlet of the heat removal device is connected with an expansion valve through a pipeline, an outlet of the expansion valve is divided into two paths, one path is in pipeline connection with an inlet of the mechanical heat pump compressor through a 1# heat and mass exchanger, the other path is in pipeline connection with the inlet of the mechanical heat pump compressor through a cold channel of an evaporator, and a mechanicalcompression type heat pump cycle system is formed. According to the open type absorption heat pump-MVR technology coupled closed cycle drying system, absorbed heat is used for regenerating a dilute solution through the mechanical compression type heat pump cycle system, regenerated steam is used for heating dry gas after the grade of the regenerated steam is improved through an MVR technology; andby means of the open type absorption heat pump-MVR technology coupled closed cycle drying system, a large amount of latent heat in damp and hot gas exhausted by a dryer can be reasonably utilized.

Description

technical field [0001] The invention relates to the technical field of drying, energy saving and emission reduction, in particular to a closed-circuit drying system coupled with an open absorption heat pump-MVR technology. Background technique [0002] The drying process is widely used in chemical industry, medicine, food, paper making, wood, food and other fields. The traditional closed-circuit drying system adopts the method of condensation dehumidification. First, the hot and humid medium is cooled to below the dew point temperature to remove moisture, and then the low-temperature and low-humidity medium is heated to the drying temperature and then sent to the drying system for operation. This method will cause A large energy loss and a large amount of latent heat are not utilized. [0003] Adsorption dehumidification uses adsorbents to absorb moisture in wet media. Although the dehumidification efficiency is high, it cannot play a role in high-temperature dry tail gas. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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