Tower of internal thermal coupling distillation tower and control process thereof

Abstract

The invention relates to a tower of an internal thermal coupling distillation tower and a control process thereof; the tower realizes the thermal coupling between a rectifying section and a stripping section only by using three external heat exchangers, one external heat exchanger is used for carrying out heat exchange between the top of the rectifying section and the top of the stripping sectionto realize the operation without external reflux of the internal thermal coupling distillation tower. One external heat exchanger is used for carrying out the heat exchange between the bottom of the rectifying section and the bottom of the stripping section, thus realizing the operation without external backheating of the internal thermal coupling distillation tower. One external heat exchanger is used for carrying out exchange between the middle of the rectifying section and the middle of the stripping section, thus realizing the thermal coupling action between the rectifying section and thestripping section. In the invention, the heat exchangers are arranged outside the rectifying section and the stripping section for facilitating the areas of the heat exchangers not to be limited by the distillation process any more, thus ensuring enough heat exchange areas. Due to the heat exchangers arranged at the top of the rectifying section and the bottom of the stripping section, the operation elasticity, dynamic characteristic and controllability of the distillation tower are improved.

Description

technical field [0001] The invention relates to a tower device with an internal heat coupling distillation tower and its control technology. Background technique [0002] The research on internal thermally coupled distillation columns began in the late 1970s, with the main purpose of solving the long-standing problem of high energy consumption in mixture separation operations based on the second law of thermodynamics. Although it has been proved in theory that the thermal coupling between the rectifying section and the stripping section can make the internal thermally coupled distillation column have very high thermodynamic efficiency, for example, the external reflux ratio and the external heat recovery ratio can be zero ( That is, it breaks the limit of the minimum reflux ratio and the minimum heat recovery ratio), but because this thermal coupling effect is difficult to realize in the design of the distillation column, this efficient internal thermal coupling distillation...

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Problems solved by technology

Although it has a larger heat transfer area than the concentric cylindrical heat transfer structure, its structure is very complicated and expensive, and it is difficult to be applied and popularized in the actual process.

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