An 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, including a fractionation tower, an intermediate condensation heat exchanger, an absorption heat pump, an intermediate reboil heat exchanger, a bottom reboiler, and a reflux tank and the overhead condenser; the rectification section of the fractionation tower is composed of an intermediate condensing heat exchanger connected with an absorption heat pump to form a top waste heat recovery loop, and the stripping section of the fractionation tower is composed of an intermediate reboiler heat exchanger connected with an absorption heat pump in sequence Bottom material heating circuit; the steam is connected to the generator of the absorption heat pump through the steam pipe; the top of the fractionation tower is connected to the top condenser and the reflux tank in turn through the top product material pipe, and the bottom side wall of the fractionation tower is passed through the bottom of the tower The product feed line is connected to the inlet of the bottom reboiler. The invention has a compact layout, not only recovers the waste heat at the top of the tower, reduces the waste heat discharge of the system, but also heats the intermediate material in the stripping section, reduces the process steam consumption of the reboiler at the bottom of the rectification tower, and saves a lot 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 major energy consumer. About 70% of the energy consumption in petrochemical production is used for separation, while rectification accounts for 95% of the energy consumption. Among them, the top of the rectification tower discharged through air cooling and water cooling The low temperature waste heat accounts for more than 70% of the energy consumption of rectification. In a conventional rectifying column, the total heating load is entirely borne by the bottom reboiler, and all the heat of condensation of materials is output by the column top condenser. But in fact, the heat required for the gasification of light components in the column along the stripping section decreases plate by plate; the cooling capaci...

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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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