Device and method for acidifying raw materials and removing sand in ethanol production

Abstract

The invention discloses a device and method for acidifying raw materials and removing sand in ethanol production. The method comprises the following steps: (1) stirring a pulverized starch slurry in a stirring tank until the sand-containing starch slurry settles at the bottom and flows into a primary acidification tank; (2) adding sulfuric acid and introducing steam into the primary acidification tank, heating, stirring until sand settles at the bottom of the primary acidification tank, and pumping sand slurry with starch into a secondary acidification tank for further acidification; (3) further stratifying the sand and the slurry, and pumping the sand slurry containing a small amount of starch into a cyclone, wherein the working principles of the secondary acidification tank is the same with those of the primary acidification tank; and (4) separating out the sand by using the cyclone, and returning the slurry containing a small amount of starch to a buffer tank. By using the method, the sand can be removed, and simultaneously, the starch can be completely recycled; the sand removal rate is up to 96%, thereby creating conditions for subsequent production; 20% of liquifying enzyme, a small amount of saccharifying enzyme and 10% of steam can be saved in the liquifying procedure; and the defects of high sand removal difficulty and imperfect sand removal effect in the prior art are overcome.

Description

technical field [0001] The invention relates to the field of ethanol production, in particular to a device and method for acidifying raw materials and removing sand during ethanol production. Background technique [0002] With the depletion of petrochemical energy, countries all over the world regard the development of renewable energy represented by bioenergy as an important part of future energy strategy, and the development of ethanol with food as raw material has been restricted, so the use of renewable non-food Substances (such as cassava and plant cellulose) are used as raw materials to produce ethanol, so as an effective substitute for fuels such as gasoline, it has become the direction of today's energy industry development. [0003] In the utilization process of cassava raw materials, the problem of sand removal has not been well solved, which is reflected in the incomplete sand removal, complicated process and unsatisfactory effect. Taking the production of cassav...

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Problems solved by technology

[0005] The primary purpose of the present invention is to overcome the defects of difficult and incomplete sand removal in the existing ethanol production, and provide a device for acidification and sand removal

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