Energy-saving environment-friendly DDGS (Distillers Dried Grains with Solubles) waste heat vaporization system

Abstract

The invention relates to an energy-saving environment-friendly DDGS (Distillers Dried Grains with Solubles) waste heat vaporization system which comprises a condensate water flash tank, a high-temperature condensate pump, a waste gas washing tower, a washing water pump, a first effective heater, a first effective separator, a second effective heat exchanger, a second effective separator, evaporators, a surface condenser, a condensate water collecting tank and a condensate pump, wherein the quantity of the evaporators is three, namely, a third effective evaporator, a fourth effective evaporatorand a fifth effective evaporator. According to the invention, secondary steam generated by a tube bundle dryer is washed by the washing tower and then is fed into a multi-level vaporization system; the condensate water generated by the tube bundle dryer is treated by the flash tank to generate steam and then the generated steam is fed into the multi-level vaporization system; the secondary steamafter washing and the steam generated by the flash tank are utilized to perform evaporation concentration on a filtrate formed after solid-liquid separation of distiller liquor; the secondary steam generated by the tube bundle dryer and heat in the condensate water are fully recovered; the recovery ratio of waste heat is high; dust pollutants in the secondary steam are absorbed; and the purpose ofsaving energy and reducing emission is achieved.

Description

technical field [0001] The invention relates to the technical field of distiller's grain protein feed production equipment, in particular to an energy-saving and environment-friendly DDGS waste heat evaporation system. Background technique [0002] In the process of alcohol production, after the alcohol is evaporated from the fermented mash, the distiller's grains rich in protein will be left, and the distiller's grains will be separated into two parts, the filter residue and the filtrate after solid-liquid separation. Finally, it can be used to produce whole distiller's grains dried feed, that is, DDGS, and the filtrate is also sent to a dryer for drying after evaporation and concentration, and the dried product can also be used to produce whole distillers grains dried feed. [0003] At present, when using a tube bundle dryer to dry distiller's grains, the secondary steam generated in the distiller's grains is called waste gas, which contains not only the water from the dis...

AI Technical Summary

Problems solved by technology

[0003] At present, when using a tube bundle dryer to dry distiller's grains, the secondary steam generated in the distiller's grains is called waste gas, which contains not only the water from the distiller's grains, but also part of the distiller's grains dust and some air. The secondary steam has a high temperature and contains a large amount of heat. If the secondary steam is directly discharged, it will cause a large amount of heat loss and waste, and the waste of energy is serious. For this reason, in the prior art, the secondary steam after the distiller's grains are dried is usually passed into the multi-effect filtrate evaporation system, and the filtrate produced by the solid-liquid separation of the distiller's grains is evaporated and concentrated, and the distiller's grains in the secondary steam are recovered. However, the heat exchange efficiency of the existing multi-effect filtrate evaporation system is low, and after only one heat exchange, the heat recovery rate in the secondary steam is low, and the secondary steam after heat exchange is directly discharged, and the secondary steam The dust pollutants still exist, which cannot meet the requirements of energy saving and emission reduction

Images