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

A rectification section and rectification technology, applied in the field of rectification, can solve the problems affecting the normal operation and service life of the compressor, the negative impact on process safety and smooth operation, and the heat load is not recovered and utilized, etc., to achieve wide industrial application Prospects, improvement of feed heat conditions, and effect of reducing operating costs

A rectification section and rectification technology, applied in the field of rectification, can solve the problems affecting the normal operation and service life of the compressor, the negative impact on process safety and smooth operation, and the heat load is not recovered and utilized, etc., to achieve wide industrial application Prospects, improvement of feed heat conditions, and effect of reducing operating costs

CN101874935AInactive Publication Date: 2010-11-03TIANJIN UNIV
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  • Rectifying section tower bottom reboiling internal heat-integrated energy-saving rectifying apparatus and method
  • Rectifying section tower bottom reboiling internal heat-integrated energy-saving rectifying apparatus and method
  • Rectifying section tower bottom reboiling internal heat-integrated energy-saving rectifying apparatus and method

Examples

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Effect test

Embodiment 1

[0035] Embodiment one (typical ideal system separation)

[0036] Situation 1: The method of the present invention is used for the separation of benzene-toluene system, and the process described in the present invention is adopted. The feed position is the top of the stripping section, the feed amount is 1000kg / h, the feed composition is 50% (wt%), and the feed temperature is 20°C. The number of theoretical plates in the rectification section and the stripping section is 34, and the feeding position is the top of the stripping section. The operating pressure of the stripping section is normal pressure, and the operating pressure of the rectifying section is 2.5atm. The output of the overhead product in the rectification section is 500kg / h, the purity of the extracted product is controlled above 99% (wt%), and the superheated temperature of the gas superheater at the top of the stripping section is 10°C. In this case, the heat provided by condensation at the top of the rectifi...

Embodiment 2

[0105] Embodiment two (typical non-ideal system separation)

[0106] Situation 1: Separation of ethanol-water system, using the process described in the present invention. The feed position is the top of the stripping section, the feed amount is 1000kg / h, the feed composition is 50% (wt%), and the feed temperature is 20°C. The number of theoretical plates in the rectification section and the stripping section is 36, and the feeding position is the top of the stripping section. The operating pressure of the stripping section is normal pressure, and the operating pressure of the rectifying section is 2.5atm. The output of the overhead product in the rectification section is 500kg / h, the purity of ethanol in the extracted product is controlled above 92% (wt%), and the superheated temperature of the gas superheater at the top of the stripping section is 10°C. In this case, the heat provided by condensation at the top of the rectification section is greater than the sum of the he...

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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...

Claims

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Application Information

Patent Timeline
03 Nov 2010
Publication
CN101874935A
IPC
B01D3/42; B01D3/14
Inventors
袁希钢; 闫兵海