Double-coarseness, double-rectification, four-tower and four-effect energy saving distillation fuel ethanol production system and using method thereof

Abstract

The invention discloses a double-coarseness, double-rectification, four-tower and four-effect energy saving distillation fuel ethanol production system and a using method thereof, and relates to the technical field of ethanol energy-saving production. The system mainly comprises a negative pressure vinasse tower / a degassing section, a normal pressure vinasse tower, a medium pressure rectificationtower and a high-pressure rectification tower, and the heating modes of all above towers are as follows: the high-pressure rectification tower is indirectly heated by a rectification tower reboiler through adopting fresh steam, alcohol steam from the top of the high-pressure rectification tower supplies heat to a medium-pressure rectification tower through a medium-pressure rectification tower reboiler, alcohol steam from the top of the medium-pressure rectification tower supplies heat to the normal pressure vinasse tower through a normal pressure vinasse tower reboiler, alcohol steam from thetop of the normal pressure vinasse tower supplies heat to the negative pressure vinasse tower through a negative pressure vinasse tower reboiler, and the alcohol steam of fuel ethanol also supplies heat to the negative pressure vinasse tower. The system has the following advantages: the steam enters one tower, and four towers work, so the consumption in the distillation process is maximally reduced; proteins in vinasse are not prone to be denatured, so the feed color is good, and devices are not coked and obstructed, and do not need to shut down and to be cleaned; and a molecular sieve has agood dehydration effect, so low water content, small molecular sieve loading capacity and small device investment are achieved.

Description

technical field [0001] The invention relates to the technical field of ethanol energy-saving production, in particular to a system for producing fuel ethanol by double-crude, double-refined, four-tower and four-effect energy-saving distillation and its use method. Background technique [0002] Current status of domestic fuel ethanol production equipment: [0003] 1. At present, domestic fuel ethanol production is mainly based on the three-tower three-effect distillation process device. This process device was first introduced by Jilin Fuel Ethanol Co., Ltd. to introduce a fuel ethanol device with an annual output of 300,000 tons from Austrian Vogelbusch Company. The construction was officially started in 2001, and it was completed and put into production in 2003. After that, domestic alcohol equipment manufacturers digested and absorbed the process device, and gradually realized localization. [0004] 2. Although the energy consumption of the three-tower three-effect fuel e...

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Problems solved by technology

[0004] 2. Although the energy consumption of the three-tower three-effect fuel ethanol process unit is relatively low, it has two major defects due to the limitation of the process route. The color turns black, the nutrient content decreases, and the temperature is too high to easily cause the material to coke, causing the equipment to be blocked. The production device must be cleaned frequently, and the shutdown and cleaning of the production device also caused a large loss; The dehydration effect of the molecular sieve in the vapor phase recovery of the alcohol vapor at the top of the tower is poor, which not only leads to a high moisture content in the fuel ethanol product, but also requires a large amount of molecular sieve to be filled, and the one-time investment in equipment is large

[0005] 3. With the development of new technologies and processes in the alcohol industry, the three-tower and three-effect fuel ethanol process device can no longer meet the needs of the alcohol industry, and there is an urgent need to develop a more energy-saving fuel ethanol process technology and device

[0006] 4. Double-crude, double-finish, four-tower, four-effect distillation production of fuel ethanol energy-saving process technology and equipment has no application examples at home and abroad

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