ИССЛЕДОВАНИЕ ИНТЕНСИВНОСТИ КОНВЕКТИВНОЙ ПЕНОСУШКИ ЖЕЛАТИНОВОГО БУЛЬОНА ИЗ ОТХОДОВ ПЕРЕРАБОТКИ РЫБ ЧАСТИКОВЫХ ПОРОД

Abstract

The intensity of the process of convective foam drying of gelatinized broth prepared from ordinary fish waste in the Astrakhan region was studied experimentally. The product was dried in a foamed state in a layer with a unilateral convective energy supply, as well as in the foamed and natural state in the form of round bars with a uniform convective energy supply. The ranges of variation of the main factors influencing the process were selected and substantiated, and their effect on the objective function (yield of dry gelatin per unit time per unit area) was analyzed. Approximating dependencies of the objective function on the main factors are obtained. According to the results of the research, application of a uniform convective energy supply in the course of drying gelatin broth under rational regimes allows to increase specific productivity of the process by 1.5 times, compared to drying with a unilateral energy supply, and to shorten the drying time from 4.2 to 2.3 hours. In this case, foaming the product results in more than a twofold increase in productivity while reducing the drying time by almost twice. The rational regimes for carrying out the process of convective drying of gelatinized broth in producing dry gelatin are determined: convective drying of the gelatinized broth should be conducted in a foamed state, with a uniform power supply, in the form of bars with circular cross section under the following conditions: initial diameter dn of a round bar = 0.004 m, initial moisture wn of product = 75%, flow rate v of the drying agent not less than 4.5 m/s, temperature T of the drying agent = 293-295 K. The indicated regimes provide the highest specific yield of the dry product G = 0.33 kg/(m2·h) and are recommended for practical use in order to increase the intensity of the process while maintaining the quality of dry gelatin.