Saint Petersburg State Technological University of Plant Polymers, Saint Petersburg, Russia

V. G. Kazakov, Professor of the Chair of Industrial Heat and Power Engineering (Faculty of Industrial Power Engineering), e-mail: k64089@yandex.ru

Saint Petersburg State Polytechnical University, Saint Petersburg, Russia

V. A. Lipin, Professor of the Chair “Physical chemistry, microand nanotechnologies” (Faculty of Technology and Materials Research, e-mail: vadim.lipin@km.ru

Based on experiment about vaporization of high silica aluminate liquors the vaporization of solutions with reverse scale formative salts temperature solubility was investigated. It is established that solubility of silica is in direct dependence with aluminate liquor concentration. If aluminate liquor on an input in the first case of the evaporating battery is in a metastable condition in process of vaporization it will pass in area of nonsaturated solutions by silica. According to research results of the vaporization realization technique at concentration of mentioned above salts in a solution responsible for the unsaturated condition area of reverse scale formative salts is offered. In process of vaporization of liquor in the direct-flow scheme the temperature of liquor will decrease and concentration of alumina to raise in process of promotion of liquor from the case to the case of the evaporating battery. These vaporization conditions allows to avoid formation of salts scale on heat exchange surfaces. The organization of heat exchange with use of mixture heat exchanger is offered. At such heat exchange loss of adjournment on walls of heat exchange equipments does not influence intensity of heat exchange and operation such heat exchanger will be steady for a long time. At heating of initial high siliceous aluminate liquor in mixture heat exchanger in the direct-flow scheme of vaporization will lead to the some dilution of initial liquor by condensate of water vapor that will positively be reflected in depth of desilication. This effect is shown in connection with reduction of solubility of silica at reduction of aluminate liquor concentration.

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