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

A technology of heat integration and rectification, applied in the field of rectification, which can solve the problems affecting the normal operation and service life of compressors, the negative impact on process safety and smooth operation, and the failure of heat load to be recovered and utilized, etc., to achieve broad industrial application prospects , Reduce operating costs, and save operating costs

A technology of heat integration and rectification, applied in the field of rectification, which can solve the problems affecting the normal operation and service life of compressors, the negative impact on process safety and smooth operation, and the failure of heat load to be recovered and utilized, etc., to achieve broad industrial application prospects , Reduce operating costs, and save operating costs

CN101874934AInactive Publication Date: 2010-11-03TIANJIN UNIV
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  • Flash evaporation feed type internal heat integration energy-saving rectifying device and method
  • Flash evaporation feed type internal heat integration energy-saving rectifying device and method
  • Flash evaporation feed type internal heat integration energy-saving rectifying device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Embodiment one (typical non-ideal system separation)

[0037] 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, and the purity of ethanol in the extracted product is controlled above 92% (wt%). In this case, the heat load provided by condensation at the top of the rectification section is greater than the sum of the heat load required by the system heat recovery heat exchanger and the gas superheater, and th...

Embodiment 2

[0061] Comparing the calculation results of Table 4 and Table 5, it can be seen that the annual total operating cost of Example 1, Situation 2 is 45315.51$ / y, while the common internal heat integrated rectification tower used for comparison with Embodiment 1, Situation 2 Total annual operating expenses are $67121.69 / y. Therefore, the total annual operating cost of Embodiment 1, Case 2 using the technology and device of the present invention is saved by 32.49%. Embodiment two (typical ideal system separation)

[0062] 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 0°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 ...

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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...

Claims

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Application Information

Patent Timeline
03 Nov 2010
Publication
CN101874934A
IPC
B01D3/42; B01D3/14
CPC
Y02P70/10
Inventors
袁希钢; 闫兵海