Rectifying section tower bottom reboiling internal heat-integrated energy-saving rectifying apparatus and method

Abstract

The invention relates to a rectifying section tower bottom reboiling internal heat-integrated energy-saving rectifying apparatus and a method. A main reboiler (28) is positioned at the tower bottom of a rectifying section (16); the tower bottom of a stripping section (5) is provided with an auxiliary reboiler (7); an auxiliary condenser (21) is arranged between a tower top gas outlet pipe and a tower top liquor condensate return pipe of the rectifying section; a feed preheater (2) is arranged at a feed position; and a gas overheater (10) and an auxiliary gas overheater (12) are arranged between a tower top steam outlet pipe of the stripping section and an inlet of a compressor (14). Compared with the traditional rectification separating method, the apparatus and the method can greatly reduce the total energy consumption of a whole rectifying tower system, the operation cost can be saved, and the purposes of energy saving and efficiency improvement can be achieved. Therefore, the rectifying section tower bottom reboiling internal heat-integrated energy-saving rectifying apparatus and the method can create great economic benefit and have a broad prospect in industrial application.

Description

technical field [0001] The invention relates to the technical field of rectification and a rectification tower system, in particular to a rectification device and method of a bottom reboiling type internal heat integrated energy-saving rectification device in a rectification section. 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...

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Problems solved by technology

[0008] (1) There is no 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's performance. Normal function and service life, which in turn leads to liquid accumulation in the compressor outlet line, which can negatively affect 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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