Flash evaporation feed type internal heat integration energy-saving rectifying device and method

Abstract

The invention relates to a flash evaporation feed type internal heat integration energy-saving rectifying device and a method, and the device comprises a system heat recovery heat exchanger, a feed preheater, a gas-liquid separator, a rectifying section, an auxiliary condenser, a stripping section, a compressor, an auxiliary reboiler and the like. The device is mainly characterized in that the gas-liquid separator is arranged on a feed pipeline; raw material liquid passes through the system heat recovery heat exchanger for heating and the feed preheater for further pre-heating and then enters into the gas-liquid separator; gas separated by the gas-liquid separator directly enters into tower bottom at the rectifying section, and liquid passes through a pressure reducing valve for reducing pressure and then enters into the top part of the stripping section; in addition, one part of saturated steam at tower top at the rectifying section is used for pre-heating fed materials, and the other part of the saturated steam is used for heating a gas overheater at the tower top at the stripping section. Compared with an ordinary internal heat integration rectifying tower, the adoption of the method and the device can greatly reduce the total energy consumption during the rectifying process, save operation cost and further achieve the purposes of energy conservation and synergy.

Description

technical field [0001] The invention relates to the technical field of rectification and a rectification tower system, in particular to a flash feed type internal heat integrated energy-saving rectification device and method. Background technique [0002] Distillation is the most widely used industrial separation method in contemporary times, and has been widely used in chemical industry, petroleum, food, light industry and other industrial sectors. Although the development of science and technology, new separation technology has begun industrial application, but in a certain period of time, the dominance of rectification technology cannot be shaken. [0003] Distillation separation technology is mature and easy to industrialize, but the disadvantage is that it consumes a lot of energy. For traditional distillation and separation, the input energy consumption accounts for more than 40% of the total industrial energy consumption, which cannot be ignored in the 21st century w...

AI Technical Summary

Problems solved by technology

[0008] (1) There is no hot gas superheater before the inlet of the gas compressor. When the compression ratio of the compressor increases, the saturated steam entering the compressor will be partially liquefied in the compressor after being compressed by the compressor, which will affect the compressor. The normal operation and service life of the compressor, which in turn leads to the accumulation of liquid in the outlet line of the compressor, will have a negative impact on the safe and smooth operation of the entire process

[0009] (2) The heat load released during the condensation of the gaseous material at the top of the rectification section is not recovered and utilized, and the condensation load provided by the outside of the system needs to be consumed

[0010] (3) The amount of steam processed by the compressor is large, resulting in a large consumption of compression work and high power consumption

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