System for evaporation and concentration by using waste heat of dryer

Abstract

The invention relates to a system for evaporation and concentration by using waste heat of a dryer. The system comprises a first tube bank dryer, a second tube bank dryer and a third tube bank dryer which successively heat materials in series, the exhaust gas outlets of the tube bank dryers are respectively connected with the air inlets of a first cyclone dust collector, a second cyclone dust collector and a third cyclone dust collector, the air outlets of the first cyclone dust collector and the second cyclone dust collector are connected with the air inlet of a waste heat absorption tower, the air outlet in the top of the waste heat absorption tower is connected with the inlet of an absorption tower exhaust fan, a filler layer is arranged at the upper part of an inner cavity of the waste heat absorption tower, a liquid distributing tray is arranged above the filler layer, a water collecting tray is arranged at the bottom of the waste heat absorption tower, the drainage outlet in the bottom of the water collecting tray is connected with the inlet in the middle of a waste heat flash tank, the waste heat flash tank steam outlet in the top of the waste heat flash tank is connected with a flash steam pipe, the bottom of the waste heat flash tank is connected with the inlet of an absorption tower circulating pump, and the outlet of the absorption tower circulating pump is connected with a water replenishing pipe in the center of the liquid distributing tray. The system for the evaporation and concentration by using the waste heat of the dryer disclosed by the invention is high in utilization rate of the waste heat and good in concentration effect.

Description

technical field [0001] The invention relates to a waste heat recovery system, in particular to a system for evaporating and concentrating using the waste heat of a dryer, which belongs to the technical field of waste heat utilization. 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 b...

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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