Device and process for recovery of low-grade waste heat of rectification system

The technology of a waste heat recovery device and a rectification system is applied in the field of low-grade waste heat recovery devices of a rectification system, which can solve the problems that the low-grade latent heat cannot be directly reused, the waste heat cannot be reused, and the leakage points are increased. High degree of equipment integration and the effect of reducing leakage points
CN110755869APending Publication Date: 2020-02-07浙江省天正设计工程有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
浙江省天正设计工程有限公司
Publication Date
2020-02-07

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Abstract

The invention discloses a device and process for recovery of low-grade waste heat of a rectification system. The device comprises a rectification tower, a tower top evaporation condenser, a raw material preheater, a tower kettle reboiler and a waste heat recovery system, wherein the waste heat recovery system comprises an intermediate heat-exchange working-medium vaporization device and a workingmedium compressor, all the tower top evaporation condenser, the raw material preheater and the tower kettle reboiler are heat exchangers, and an intermediate heat-exchange working medium is introducedinto a cold fluid inlet of the tower top evaporation condenser; a cold fluid outlet of the tower top evaporation condenser is connected with an air inlet of the working medium compressor through theintermediate heat-exchange working-medium vaporization device by using pipelines, an air outlet of the working medium compressor is connected with a hot fluid inlet of the tower kettle reboiler by using pipelines, and a hot fluid outlet of the tower kettle reboiler is connected with a hot fluid inlet of the raw material preheater through a pipeline; and the intermediate heat exchange working medium which is obtained after cooling is performed through heat exchange is discharged from the hot fluid outlet of the raw material preheater. The device has a simple structure, and low-grade heat of steam in the tower top of the rectification tower can be recovered effectively through the device.
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Description

technical field

[0001] The invention relates to a low-grade waste heat recovery device and process of a rectification system. Background technique

[0002] Distillation is a technology that separates components in a mixture by utilizing their different volatilities. It is an important unit operation in petrochemical, pharmaceutical and other industries. With the rapid development of the chemical industry, the application of rectification operations is becoming more and more widespread; however, the energy consumption of the rectification process is very high, accounting for 50% to 70% of the energy consumption of the separation process in the entire chemical industry. Most of the energy consumed in the rectification process is not used for component separation, but is taken away by cooling water or materials. Therefore, the energy saving potential of the rectification process is great. Reasonable use of the heat energy of the rectification process itself can reduce the energ...

Claims

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