Rectifying tower top reflux temperature adjusting system and process

Abstract

The invention relates to a rectifying tower top reflux temperature adjusting system and process, the adjusting system comprises a temperature control pipe group, a reflux tank, an emptying pipeline and a pressurizing pipeline, and the pressurizing pipeline is communicated with the middle part of the emptying pipeline at the top of the reflux tank. In the process of reducing the reflux temperature, the pressure needs to be adjusted by increasing the heat bypass flow, but the reflux temperature can be increased, and at the moment, the pressure of the reflux tank at the top of the tower can be increased, the pressure of the reflux tank can be maintained and the heat bypass flow can be reduced by opening a pressurizing pipeline valve, so that the top reflux temperature of the rectifying tower is reduced, and the heat balance of the rectifying tower system is maintained; the material delivery temperature is reduced, and safe and stable operation of a production system is guaranteed; the influence of evacuation and cavitation on the top reflux pump of the rectifying tower is avoided.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a rectification tower top reflux temperature adjustment system and process. Background technique [0002] Distillation columns are widely used in chemical production and have long occupied a dominant position in all separation methods. However, in the production process, due to the difference in media and working conditions, the top reflux temperature of the rectification tower is high, which is not conducive to the gas-liquid phase heat transfer balance of the rectification tower; the two do not use the operation of the top reflux pump , when the reflux temperature at the top of the tower is high, it is easy to cause pump evacuation and cavitation, which will affect the operation of the equipment. Products) delivery temperature is high, which cannot meet the safety requirements, especially in summer high temperature weather, which is more prominent and not conducive to the safe...

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Problems solved by technology

[0004] However, in the process of reducing the temperature of the reflux tank, the pressure of the reflux tank does not meet the requirements of the working conditions due to the small thermal bypass or the large cooling bypass, and the temperature of the reflux tank cannot be further reduced. At the same time, the pressure of the reflux tank is too low , resulting in evacuation and cavitation of the reflux pump at the top of the distillation column

Especially in high temperature weather in summer, this problem is more prominent, causing problems such as fluctuations in production conditions, unqualified product control indicators, and unstable operation of equipment.

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