Effect of technological properties of pea seeds and processing modes on efficiency of its dehulling

Abstract

Introduction. The process of dehulling grain peas is not enough researched, and there are difficulties of modeling the technological process as a whole. Presented research results of the process of pea seeds dehulling allow to understand the behavior of pea seeds during dehulling in machines with abrasive working members. Materials and methods. Pea seeds of varying large-scale and moisture are scaly in the laboratory dehuller. The products of dehulling were cleaned in the aspiration channel from husk and dust middlings after this process the products were weighed and determined the dehulling index. By changing the moisture content (from 11,6 to 16,6%) and the size of the pea seeds (from 213 to 257 g), the speed of rotation of the working body of the dehuller (from 25 to 41,6 s-1), the duration of processing (from 5 to 25 s) and the coefficient of filling the working chamber (from 0,09 to 0,48) of the machine was presented dependence of the parameters on dehulling efficiency. Results and discussion. It is determined that the increase of processing time, the pea seeds, the speed of the working organs and filling coefficient of the working chamber of the dehuller increase the efficiency of dehulling peas by linear dependence. Increase in the size of pea seeds contributes to increase of efficiency of dehulling mainly due to increase of the yield of small. The increase in the scale of seeds leads to a decrease in the dehulling index. Along with the increasing efficiency of dehulling, increases and yield of trinkets at the expense of the kernel. When the moisture of pea seeds increases, the yield of a fine grits increases comparing to the dehulling of dry pea. Yield of the kernel is directly proportional to the reduction of the yield of undehulling seeds. The yield of a fine grits also has linear dependencies when you change the following parameters. In the process of dehulling reduces the ash content of the kernel, but also decreases the ash content and husk and dust middlings, which is the result of transition of low-ash content particles of kernel into the dust middlings. Conclusions. For effective dehulling of pea seeds, it is necessary to carry out dehulling for 10-15 s, filling coefficient of the machine must be not less 0,48. Pea seeds with an absolute mass of 257 g, dehull better than pea seeds with an absolute mass of 213 g.