Method and system for continuously separating ethanol and utilizing residual heat based on solid-state fermentation material

Abstract

The invention relates to a method and a system for continuously separating alcohol and utilizing residual heat on the basis of solid state fermentation material, which belongs to the technical field of biomass fuel alcohol. The method mainly comprises the following steps: tight-line pumping, feeding into tower, distributing, stripping alcohol, discharging residue, utilizing residual heat and the like. The system achieves residual heat reutilization through the following two approaches which comprises firstly, looping back residual liquid to outer cylinder clamp ferrules of a closed ring groove rotating disc stripping tower, heating up material and closed tunnel outer clamp ferrules preheating fermentation material, secondly, complementing solid state distillation steam consumption through electrically heating. The alcohol-residue continuous separation technique and closed ring groove rotating disc alcohol stripping tower which are proposed by the invention are suitable for stripping alcohol in solid state fermentation products of sugar or starch such as sweet sorghum stalks and the like, which achieves a goal of automatically feeding and discharging, and continuously separating alcohol and residue, and the method of the invention effectively utilizes reactor residual liquid hidden heat, which complements partial steam gas, and achieves the superiorities of high net energy ratio of solid state fermentation path sweet sorghum alcohol and low environmental load.

Description

technical field [0001] The invention relates to an integrated method and system for continuous separation of ethanol and comprehensive utilization of waste heat based on sweet sorghum stalks (including other sugary raw materials, such as sugar beet, sugarcane, Jerusalem artichoke, etc.) The integration technology of the continuous separation of slag-ethanol and the equipment of the closed-loop rotary disc stripper, and the organic integration with the subsequent rectification unit to reduce production energy consumption and realize the reuse of waste heat belong to the field of biofuel technology. Background technique [0002] Bio-liquid fuel is currently the only internationally recognized renewable energy that can replace gasoline and diesel on a large scale in the field of transportation. 2 With emission reduction concerns, the bio-liquid fuels industry is at a crossroads. At present, it is mainly fuel ethanol and biodiesel, of which fuel ethanol accounts for more than 8...

AI Technical Summary

Problems solved by technology

The United States, India, Romania and other countries have explored the production of sweet sorghum ethanol by referring to the sugarcane fuel ethanol production process. There are fermentable sugars, which have not been fermented and utilized; sweet sorghum juice has a short period of extraction, which is not suitable for annual continuous production; storage of sorghum juice needs to be concentrated and then sterilized, which consumes a lot of energy; concentrated sugar juice can only be fermented with alcohol after being diluted with water, resulting in waste water The quantity is large, the processing cost is unbearable, and the liquid fermentation route is difficult to realize commercialization; the solid-state fermentation method produces fuel ethanol by crushing sweet sorghum stalks and directly fermenting, which has unique advantages and can fundamentally overcome the congenital deficiencies of liquid fermentation and reduce Requirements for raw material pretreatment intensity, and at the same time, the amount of waste water is small, which can significantly increase the yield of ethanol

Scholars at home and abroad have explored the production of sweet sorghum ethanol by solid-state fermentation, but most of them stay at the level of laboratory experiments. Their research focuses on fermentation engineering, and there is not enough research on the separation of fermentation material and ethanol; The brewing process is backward in technology, labor-intensive, and the fermentation cycle is long and inefficient; meanwhile, the fermentation product is a solid material, and the "retort barrel" distillation and steam-over condensation technology can only be operated intermittently, which is labor-intensive and yields 70% (v / v) Crude alcohol solutions with different degrees below consume a large amount of heating steam and cooling medium, making their production costs high and unable to achieve large-scale commercial operation

What's more, the traditional solid-state distillation process has not been studied in depth in terms of theory and technology.

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