Method and device for distilling fuel ethanol by using secondary steam of superheated steam fluidized bed dryer as partial heat source

Abstract

The invention discloses a method and a device for distilling fuel ethanol by using secondary steam of a superheated steam fluidized bed dryer as part of a heat source. The device comprises a negative pressure mash column I, a negative pressure mash column II, a low-pressure refining column, a high-pressure refining column, a molecular sieve adsorber group, the superheated steam fluidized bed dryer and the like. The fermented mature mash enters a degassing section, one part of the gas-removed fermented mash enters the negative-pressure mash column I, the other part of the gas-removed fermented mash enters the negative-pressure mash column II and is heated by steam to obtain crude alcohol, the crude alcohol is subjected to acid discharge and aldehyde removal through an acid discharge section and then enters the low-pressure refining column for further distillation, and light alcohol at the bottom of the column and distilled alcohol respectively enter the middle lower part and the top of the high-pressure refining column; after being distilled and concentrated in the high-pressure rectifying column, the light alcohol and concentrated alcohol fed by the low-pressure rectifying column enter the molecular sieve adsorber group together for dehydration to obtain fuel ethanol. The negative pressure mash column II in the device directly uses secondary steam of the superheated steam fluidized bed dryer as a heat source, so that steam consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of alcohol production technology, in particular to a fuel ethanol distillation method and device using secondary steam of a superheated steam fluidized bed dryer as part of the heat source. Background technique [0002] At present, domestic fuel ethanol production is mainly based on the three-tower three-effect distillation + molecular sieve dehydration 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 operation in 2003. After that, domestic alcohol equipment manufacturers digested and absorbed the process device, and gradually realized localization. This equipment mainly has disadvantages such as high operating temperature of combined tower (up to about 120°C), easy coking and carbo...

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Problems solved by technology

However, compared with the negative pressure operation of the mash tower, there is still a gap in the quality and color of the feed

[0004] With the promotion of thick mash fermentation, multi-effect evaporation and MVR evaporation technology, the low-pressure secondary steam generated in the drying section still has a large surplus after being used for the evaporation of clear liquid, but this part of the surplus steam contains a lot of air and is of low grade. The temperature is low (generally around 80°C), unable to provide heat to the distillation section, and can only be discharged, resulting in waste of heat and environmental pollution

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