Alcohol fermentation waste liquid heat pump concentration process and device therefor

Abstract

The invention discloses an alcohol waste liquid heat pump concentration process and a device therefore. The device mainly comprises a high pressure evaporator, a low pressure evaporator, a high pressure gas-liquid separator, a low pressure gas-liquid separator and a heat pump compressor; the high pressure and the low pressure evaporators are connected with each other in series in sequence; secondary steam produced by the evaporation of feed liquor in the high pressure evaporator is taken as a heating thermal resource for feed liquor in the low pressure evaporator; secondary steam produced by the evaporation of the feed liquor in the low pressure evaporator is taken as a heating thermal resource for the feed liquor in the high pressure evaporator after being pressurized by the heat pump compressor; and except that a certain amount of boiler steam is required for the start-up in the initial stage and to ensure the normal operation of the heat pump compressor only a certain amount of electrical or mechanical work is required after normal operation, the whole system can operate without other energy from outside. Compared with the multiple effect evaporation technology, the invention has the following advantages: the evaporation of water in waste liquid per unit mass requires less energy consumption; a vacuum pump needs not to be arranged; and meanwhile, the amount of condensed water reduces to some degree, so that the purpose of saving energy and protecting the environment during alcohol production can be achieved.

Description

technical field [0001] The invention belongs to the technical field of alcohol production, and relates to a process and a device for processing alcoholic fermentation feed liquid, in particular to a heat pump concentration process and a device for alcoholic fermentation lees. Background technique [0002] Alcohol is a colorless, transparent, volatile, flammable, non-conductive liquid with the smell of wine and a pungent spicy taste, slightly sweet, its scientific name is ethanol, and its molecular formula is C 2 h 5 OH, because its chemical molecular formula contains hydroxyl, it is called ethanol, its specific gravity is 0.7893, its freezing point is -117.3°C, and its boiling point is 78.2°C. An azeotropic mixture is formed with an azeotropic point of 78.15°C. The mixture of ethanol vapor and air can cause explosion, and the explosion limit concentration is 3.5-18.0%. Alcohol solution has a strong killing effect on bacteria when the concentration is 70%. It can also be u...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the disadvantages of large energy consumption and the need to maintain the vacuum degree of the system when using the multi-effect evaporation method for traditional distiller's grains, and adopt heat pump technology to reuse the secondary steam generated by evaporation, thereby providing an energy-saving and environmental protection Alcoholic fermentation lees heat pump concentration process and its device

Images