ENERGY EFFICIENT TECHNOLOGY OF RECTIFIED ETHYL ALCOHOL
Abstract
In the conditions of rising energy prices, the urgent task for the alcohol industry is the development and implementation of energy-efficient technologies of rectified ethyl alcohol, which allow reducing water and steam consumption and increasing the output of the finished product from a unit of raw materials. To solve it, modernized distillation units (BRU) are being implemented, which work under rarefaction or provide for the heating of some columns by the secondary steam of high potential of other columns operating under pressure, equipping the units with booster and sieving columns, increasing the number of contact devices, using the heat of bard and Luther water , closed column heating, introducing cyclical installations, etc. A promising direction in the creation of energy-efficient technologies is the optimization of the operation of the heat exchange equipment included in the BRU, as well as the use of the heat of secondary steam.
One of the factors for optimizing heat exchange equipment is the correspondence of the heat transfer surface of dephlegmators and condensers to their heat load, as well as the methods of their connection to water communication. Also, to optimize the operation of heat exchange equipment, the connection schemes of dephlegmators and vertical condensers of BRU are of great importance.
The efficiency of the innovative technology of rectified alcohol has been determined under production conditions, which provides for the supply of alcohol-containing fractions in the form of non-condensed in the deflegmators of the main columns of vapour to the feed plate of the impurity concentration column. This solution allows to reduce the total water consumption by 0,032 m3/dal (5,1 %) and the heating vapour by 1,2 kg/dal (1,9 %) in terms of anhydrous alcohol in comparison with the known method. The expected profit for the plant with a capacity of 3000 dal of alcohol per day will be about UAH 1,5 million per year. Increasing the amount of non-condensed vapour from 2 to 5 % to feed the column will reduce the heating vapour consumption from 10 to 8,8 kg/dal, and increase the profit by 33,3 %. During the tests the qualitative indicators of rectified alcohol corresponded to the normative ones for "Lux" grade.
References
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