Method for utilizing mash waste heat during alcohol production process

Abstract

The invention discloses a method for utilizing mash waste heat during an alcohol production process. The method comprises the following steps: (1) pumping 80 DEG C liquid mash into a heat exchanger for heat exchanging; (2), pumping 80 DEG C liquid vinasse into a heat exchanger for heat exchanging; (3), leading 68 DEG C liquid mash and 68 DEG C liquid vinasse which are produced after heat exchanging out for the next process; and (4), mixing the recycled heat quantity, and leading the mixed heat quantity into a circulating cooling water system through an electric control system. According to the method, the 80 DEG C liquid mash and the 80 DEG C liquid vinasse produced during the alcohol production process are utilized; an HR waste heat recovery system which is domestic professional equipment is adopted; the part of heat quantity is recovered to produce 18 DEG C chilled water, so as to control the fermentation temperature to be 30 to 32 DEG C; not only the temperature controlling ensuring annual normal alcohol fermentation but also waste heat utilization are realized; the refrigeration cost is reduced; and the production benefit is improved stably.

Description

technical field [0001] The invention belongs to the technical field of alcohol fermentation industry, and more specifically relates to a method for utilizing residual heat of mash in the alcohol production process. Background technique [0002] During the production process of cassava alcohol, the temperature of the mash after cooking and liquefaction and the distiller's grains discharged from distillation are not lower than 80°C, and according to the process requirements, the temperature needs to be lowered to about 62°C to enter the next process. Currently, alcohol production plants use cooling The water performs heat exchange to cool down, and there is no way to effectively use this part of the heat, and it also consumes energy for cooling. At the same time, in the production process, the fermentation temperature needs to be controlled at 30-32°C. The temperature is lowered through the spiral plate heat exchanger outside the tank. Cooling water is usually used to cool dow...

AI Technical Summary

Problems solved by technology

[0002] During the production process of cassava alcohol, the temperature of the mash after cooking and liquefaction and the distiller's grains discharged from distillation are not lower than 80°C, and according to the process requirements, the temperature needs to be lowered to about 62°C to enter the next process. Currently, alcohol production plants use cooling The water is used for heat exchange and cooling. There is no way to effectively use this part of the heat, and it also consumes energy for cooling.

At the same time, in the production process, the fermentation temperature needs to be controlled at 30-32°C. The temperature is lowered through the spiral plate heat exchanger outside the tank. Cooling water is usually used to cool down. However, when the temperature is high in summer, it cannot be cooled and affects normal production. Some enterprises use deep well water to cool down. Due to the need to protect groundwater resources, the exploitation of deep well water has been prohibited. In order to ensure production, a refrigeration system is required. The operation cost of a refrigerator system that only uses electricity or steam is relatively high, which increases production costs.