Ways to improve process of wet granulation of fermented poultry litter solid fraction

Abstract

The carried-out analysis of designs of granulators for the process of damp pressing showed that this method is implemented by means of screw granulators better. At the same time effective objectives are achieved by production of the end product -granules, their quantitative and qualitative indexes. Preliminary search experiments on pressing of firm fraction of the fermented bird dung in the screwgranulator, which is most meeting the requirements of obtaining a certain quantity of qualitative granules, are made. The unstable movement of the pressed material in matrix dies was as a result revealed. It does not allow to reach the required capacity of the screw granulator and to receive granules with quality characteristics.For realization of an effective objective -obtaining necessary quantity of qualitative granules from firm fraction of the fermented bird dung the constructive and technology scheme of the screw granulator is proved. For this purpose innovations are entered into a design of the screw granulator: zone of plasticization and bladed knife. The zone of plasticization is located between the screw and the matrix in the screw granulator and the bladed knife in the plasticization zone before the matrix.Researches of the process of damp granulation were conducted by means of a multiplefactor planning method of an experiment. During the research of the process of damp granulation of FF FBD in the screw granulator we studied the following factors: frequency of rotation of the screw of the granulator (17-27 rad•s -1 ), humidity of the pressed material (34-40 %) and the number of blades of the knife (0-4 pcs), influencing the productivity and specific expenses of energy. After processing of the results of the experiment performance (in the range of 240-265 kg•h -1 ) specific power costs were received (in the range of 17.1-24, 317 kW•h•t -1 ). The greatest influence both on the performance and specific power costs has the factor of the number of blades of the knife, the smallest -the frequency of rotation of the screw of the granulator. With increase in the number of blades of the knife, also the performance increases.