Feed position reconfiguration method and device for rectification column energy-mass coupling system

Abstract

The invention discloses a feed position reconstruction method and device for an energy and mass coupling system of a rectifying tower. The method comprises the following steps: based on the pinch point principle, analyzing a rectifying tower energy exchange network, and analyzing a rectifying tower mass exchange system through a graphic method; considering the rectifying tower energy exchange network and the rectifying tower mass exchange system, and analyzing a system bottleneck through a heat-transmission-to-mass-transmission graph; adjusting the position of a feed tower plate at the system bottleneck. Compared with the existing bottleneck analysis and debottleneck technology of the energy and mass coupling system in the prior art, the method integrates system energy exchange and mass exchange, conducts bottleneck analysis on the coupling system, and realizes reconstruction of a feed position of the energy and mass coupling system of the rectifying tower only through switching the position of the feed tower plate in the bottleneck position in an on-line mode, so that improvement cost is low, normal production is not influenced, control freedom degree is high, and the energy exchange and the mass exchange of the whole rectifying tower are made to be always in best states.

Description

technical field [0001] The invention relates to the technical field of energy saving in petrochemical industry, in particular to a method and device for reconfiguring the feed position of a rectification tower energy-mass coupling system. Background technique [0002] Petrochemical enterprises are major energy consumers in my country, and they have an urgent need for energy conservation and emission reduction and equipment development for important chemical industries. The rectification tower is the most important and most widely used petrochemical process unit, especially the ethylene cracking process, which generally consists of multiple rectification towers, and often includes rectification towers with multiple feeds. There are both energy exchange and mass exchange in the distillation column, and they are coupled and interact with each other, which is a typical energy-mass coupling system. [0003] At present, in a large number of studies on the optimization of the ener...

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Problems solved by technology

[0004] The following problems exist in the optimization of the energy-mass coupling system of the actual rectification column: (1) The bottleneck analysis method such as the load performance diagram is relatively perfect when used in the design of the rectification mass transfer process, but does not consider the energy exchange of the process

However, the pinch technology is only aimed at the energy exchange system, and it is difficult to take into account the mass exchange effect of the process.

However, in the rectification column, energy exchange and mass exchange are carried out simultaneously and interact with each other. To analyze the bottleneck of such a chemical process system and solve the bottleneck, it is necessary to fully consider the coupling relationship between heat transfer and mass transfer. , so far there is no literature related to this kind of research

(2) At present, for the optimal design of the energy-mass coupling system of the rectification column, usually only the reflux ratio and the utility

In this way, when the process operating conditions fluctuate, it is difficult to balance energy consumption and resource consumption due to limited control means

On the other hand, adjust the process structure based on the bottleneck analysis to reduce the total consumption, such as modifying the tray structure, tray type and reboiler type near the bottleneck, but the modification cost is high and affects normal production

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