Four-tower triple-effect distillation dehydration device and method for preparing fuel ethanol from industrial tail gas fermentation mash

Abstract

The invention discloses a four-tower triple-effect distillation dehydration device and method for preparing fuel ethanol from industrial tail gas fermentation mash. The device comprises a thick mash tower, a clear mash tower B, a clear mash tower A and a rectifying tower which are sequentially connected, one side of the thick mash tower is connected with a thick mash wine steam preheater through a pipeline; one side of the clear mash tower B is connected with a clear liquid preheater through a pipeline; one side of the clear mash tower A is connected with a clear liquid preheater through a pipeline; the other sides of the thick mash tower, the clear mash tower B and the clear mash tower A are respectively and sequentially connected with a rectifying tower feeding preheater and the middle part of the rectifying tower through pipelines; the top of the rectifying tower is connected with a molecular sieve through a pipeline; the molecular sieve is connected with the clear mash tower A reboiler through a pipeline; the clear mash tower A reboiler is connected with a finished product tank; and the thick mash tower and the clear mash tower B are both negative pressure mash towers, and the clear mash tower A is a normal pressure mash tower. According to the invention, thick mash and clear mash prepared by fermentation of industrial tail gas are used for preparing fuel ethanol and are combined together, so that the distillation efficiency can be improved, and steam supply of one tower and work of four towers can be realized.

Description

technical field [0001] The invention relates to the technical field of alcohol distillation, in particular to a four-tower three-effect distillation dehydration device and method for preparing fuel ethanol from industrial tail gas fermentation mash. Background technique [0002] The traditional fuel ethanol production process mostly uses corn, wheat, cassava, etc. as raw materials, and produces ethanol through yeast fermentation. At present, many fuel ethanol enterprises in China have adopted this production process, but this process uses grain and crops as raw materials. The cost is high; at the same time, as a country with a large population and a small area of ​​cultivated land per capita, China uses a large number of grain crops as raw materials to produce ethanol, which has food security problems, and it is difficult to solve the development problem of "not competing with others for food and land". Gas fermentation using industrial tail gas as raw material uses CO as a ...

AI Technical Summary

Problems solved by technology

However, the alcohol concentration in the mash obtained from industrial tail gas fermentation is low, generally less than or equal to 5% vol; two types of mash are obtained from fermentation: thick mash and clear mash; the water content of thick mash is lower than that of clear mash, but the concentration of mash The biomass is higher than that of clear mash; the biomass of clear mash is generally 0; and the amount of clear mash obtained by fermentation is much larger than that of thick mash. Since the amount of thick mash is relatively small, distillation is performed separately and steam is consumed

Moreover, the mash obtained from industrial tail gas fermentation has high viscosity and is easy to foam, which affects the distillation efficiency

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