Absorption heat pump rectification system based on intermediate reboiling and intermediate condensation

Abstract

The invention discloses an absorption heat pump rectification system based on intermediate reboiling and intermediate condensation. The absorption heat pump rectification system comprises a fractionating tower, an intermediate condensation heat exchanger, an absorption heat pump, an intermediate reboiling heat exchanger, a tower bottom reboiler, a reflux tank and a tower top condenser; the rectifying section of the fractionating tower forms a top waste heat recovery loop through intercommunication of an intermediate condensing heat exchanger and an absorption heat pump, and the stripping section of the fractionating tower forms a bottom material heating loop through intercommunication of an intermediate reboiling heat exchanger and the absorption heat pump; steam is communicated with a generator of the absorption heat pump through a steam pipeline; and the top of the fractionating tower is sequentially communicated with the tower top condenser and the reflux tank through a tower top product material pipeline, and the side wall of the bottom of the fractionating tower is connected with an inlet of the tower bottom reboiler through a tower bottom product material pipeline. The system is compact in layout, recovers waste heat at the top of the tower, reduces the waste heat emission of the system, heats the middle material of the stripping section, reduces the process steam consumption of the reboiler at the bottom of the rectifying tower, and saves a large amount of steam.

Description

technical field [0001] The invention relates to the technical field of petroleum refining, in particular to an absorption heat pump rectification system based on intermediate reboiling and intermediate condensation. Background technique [0002] Petroleum refining is a large energy consumer. About 70% of the energy consumption in petrochemical production is used for separation, and the energy consumed by rectification accounts for 95%. Low-temperature waste heat accounts for more than 70% of rectification energy consumption. In a conventional distillation column, the total heating load is entirely borne by the reboiler at the bottom of the column, and the condensation heat of all materials is output by the condenser at the top of the column. But in fact, the heat required for the gasification of light components along the stripping section in the tower decreases step by step; the cooling required for the condensation of heavy components along the rectification section decre...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an absorption heat pump rectification system based on intermediate reboiling and intermediate condensation. By adding an intermediate condensation heat exchanger and an intermediate reboil heat exchanger, the absorption heat pump is used to transfer heat and cool the rectification section Gas-phase materials, heating liquid-phase materials in the stripping section, to solve the problem of material heating energy level mismatch

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