Production process of DDGS feed

Abstract

The invention relates to a production process of DDGS feed. The production process successively comprises the following steps: separating waste liquor of an alcohol plant into wet alcohol residues and clear liquid; concentrating the clear liquid into concentrated liquid; feeding the wet alcohol residues to a first tube bundle dryer, carrying out first-stage drying and controlling return ratio; after first-stage drying, carrying out first pulp adding by using the concentrated liquid; after mixing evenly, feeding into a second tube bundle dryer, carrying out second-stage drying and controlling return ratio; after second-stage drying, carrying out second pulp adding by using the concentrated liquid; after mixing evenly, feeding into a third tube bundle dryer, carrying out third-stage drying and controlling return ratio; defining alcohol residues discharged after third-stage drying as the DDGS feed; and cooling the DDGS feed in a multi-stage reverse flow cooling tower. High-quality tail gas of the first tube bundle dryer and the second tube bundle dryer and low-quality tail gas of the third tube bundle dryer are respectively subjected to dust removal and waste heat recycling, and the recycled heat is used for concentrating the clear liquid into the concentrated liquid step by step. The production process of the DDGS feed is low in steam and power consumption, high in drying efficiency and good in product quality.

Description

technical field [0001] The invention relates to a production process of feed, in particular to a production process of DDGS feed, and belongs to the technical field of DDGS feed production. Background technique [0002] Alcohol production in alcohol factories usually uses corn and other raw materials for liquid fermentation, starch is converted into ethanol and carbon dioxide, and other nutrients such as protein, fat, fiber, etc. are left in the mash. At the same time, due to the action of microorganisms, the content of protein, B vitamins and amino acids in the mash is increased compared with that of corn, and it contains unknown growth-promoting factors generated during fermentation, so it is a good protein feed. [0003] DDGS (Distillers Dried Grains with Solubles) is a feed obtained by drying and concentrating the filtrate and then mixing it with the filter residue. Since the protein content of DDGS is more than 26%, it has become a new type of protein feed material wid...

AI Technical Summary

Problems solved by technology

Such a process has the following deficiencies: (1) After the alcohol residue is dried to a moisture content lower than 12%, a shell will be formed on the surface. At this time, the slurry is added, and the concentrated solution is not easy to penetrate into the inside of the alcohol residue, but it is only bonded On the surface of the alcohol slag, the alcohol slag is easy to form agglomerates, and the product quality is poor

⑵The alcohol residue is dried in place at one time, the steam consumption is large, the drying efficiency is low, and it is not conducive to the cascade utilization of energy

⑶In order to discharge the humidity as quickly as possible, the exhaust air volume of the tube bundle dryer is relatively large, and the opening of the fresh air damper is also relatively large, so that the exhaust gas temperature of the tube bundle dryer is low and the air content is high, which reduces the quality of the exhaust gas and is not conducive to environmental protection. Exhaust gas for waste heat recovery and utilization

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