Energy saving method and equipment for rectification separation

Abstract

The invention relates to an equipment and method for saving energy conservation in selective evaporation. The equipment involves A and B rectification tower in series. The bottom of Tower A connects the reboiler. The export of Tower A connects the import of Tower B. The export of Tower A on the top connects middle reboiler, reflux accumulator, reflux pump. The bottom of Tower B connects middle reboiler. The top of Tower B connects condenser, reflux accumulator, reflux pump. The heat of condensation of Tower A is as the load of middle reboiler when connected Tower B. Part of the heat of condensation reflows to the tower and other is as the product. In Tower B, the light product boils over from the top. Some reflows to tower and other is as the product. The heat is from condenser and middle reboiler and attaches the light-load adjustment reboiler to achieve connecting in series, the mightiness coupling between condenser and middle reboiler. The design is reasonable; the effect on saving energy is obvious.

Description

Technical field: [0001] The invention relates to an energy-saving rectification separation method and equipment for rectification separation. Background technique: [0002] The current schematic flow chart of a typical single-column rectification is shown in Figure 1. The raw materials are separated through the rectification tower, the top product is obtained from the top of the tower, and the bottom product is obtained from the bottom of the tower. [0003] The current schematic flow chart of a typical series-connected two-tower rectification is shown in Figure 2. The raw material enters the rectification tower I, and the tower top product I is obtained from the top of the tower, and the tower bottom liquid enters the rectification tower II, and another tower top product II is obtained from the top of the rectification tower II, and the tower bottom is obtained from the tower bottom product. [0004] At present, the typical single-column rectification and two-column rect...

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Problems solved by technology

[0004] At present, the typical single-column rectification and two-column rectification technologies in series all use standard condensers and reboilers without "thermodynamic coupling" and need to consume the corresponding heat load of the condenser and reboiler. There are needs and possibilities for improvement

[0005] At present, "intermediate reboiler" technology is used in single-column distillation, but its heat source comes from other parts, not from the rectification column system itself, and it is inconvenient to start and operate, so it needs to be improved

[0006] At present, in the single-column distillation, there is a "double-column double-pressure parallel condenser / reboiler thermal coupling technology", but this method will bring inconvenience to the operation, because an almost identical column is connected in parallel, so that The operation is complicated; and because of the "thermal coupling", the lower pressure "condenser / reboiler thermal coupling" column will bring inconvenient operation

[0007] At present, in the double-column methanol rectification, the technology of "double-column double-pressure series condenser / reboiler thermodynamic coupling" is used, but it is not the technology of "condenser / intermediate reboiler thermodynamic coupling", and the "additional Regulate reboiler", which brings inconvenience to the operation of the lower pressure "condenser / reboiler thermodynamic coupling" column

[0008] At present, in the typical two-column rectification in series, there are "two-tower, double-pressure series condenser / reboiler thermodynamic coupling" technology, but "two-column, double-pressure series, condenser / intermediate reboiler thermodynamic coupling" technology is not used. coupling" technology and "additional regulation reboiler" technology

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