Absorption compression type heat pump rectification system

Abstract

The invention discloses an absorption compression type heat pump rectification system. The absorption compression type heat pump rectification system comprises a rectification tower and an absorptioncompression heat pump set, wherein a gas absorption end of a compressor is connected with a steam outlet of a generator and an exhausting end of the compressor is connected with a steam inlet of an absorption device; after steam at a tower top enters the generator and a cooler, part of condensed liquid returns back to the upper part of the rectification tower through a reflowing pump and the restof condensed liquid is used as a discharged material of the tower top; and after material liquid at a tower bottom enters the absorption device through a first tower material pump and is heated, the material liquid returns back to the lower part of the rectification tower. Gas exhausted by the compressor passes through a first middle heat exchanger and then enters the absorption device; and the material liquid at the tower bottom passes through the absorption device and then is subjected to step heat exchange through the first middle heat exchanger. By adopting the absorption compression typeheat pump rectification system disclosed by the invention, the problem that the rectification and energy-saving effect of a steam compressor type heat pump is not good when the temperature differencebetween a tower top and a tower kettle is relatively great; and a conventional rectification tower can be directly subjected to energy-saving modification and a flow of an existing rectification toweris not damaged.

Description

technical field [0001] The invention relates to the rectification of petrochemical products, in particular to an absorption compression heat pump rectification system. Background technique [0002] Distillation is an important part of the petrochemical industry, consuming up to 60% of energy. In the conventional rectification process, about 95% of the energy input by the bottom reboiler is taken away by the cooling water at the top of the tower, and this part of energy cannot be further recovered, resulting in low heat utilization efficiency in conventional rectification. The current international energy situation is becoming more and more severe, and the research on distillation and energy-saving technology has also been paid more and more attention. The rectification process is a process of continuous evaporation-condensation. The latent heat is released by the condensation of the gas phase at the top of the tower, and the latent heat is required for the evaporation of th...

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Problems solved by technology

[0006] The present invention proposes an absorption compression heat pump rectification system, which solves the problem that the energy saving effect of steam compressor heat pump rectification is insufficient when the temperature difference between the top and the bottom of the tower is large. good question

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