Currently, new methods of grain processing are being developed in Russia. One of them is the method of obtaining liquid sugary feed. For the production of homogeneous grain molasses, the plants are equipped with grinders. The article presents the results of modeling fluid movement in a tubular grain grinding body. In the calculations, two grinders of 30 and 50 mm in diameter were taken, based on the size of the pump outlet pipe and the assortment presented on the market. The effect of the length of the grinder was also assessed. Three options were selected: 100, 200 and 1000 mm. The maximum length of the grinder was limited by the size of the molasses preparation unit. The distance between the centers of the grid holes was set according to passport data: 14 mm in length and 8 mm in diameter of the grid. The diameter and thickness of the grating were also selected from the passport data and set equal to 6 mm and 3 mm, respectively. In accordance with the characteristics of the pump, the mass flow rate of water was taken into account, which was 7 kg/s. The influence of the diameter of the grinder and its length on the flow rate and pressure was considered. The relative pressure drop, the resistance of the grinder and the power of heat losses were determined. It was revealed that the grinder with a maximum diameter of 50 mm has lower resistances, it has less power and pressure losses. The length of the grinder grate has a negligible effect, but at the same time, with increasing length, the number of holes with a turbulence zone increases, increasing the chance of grain entering them and its destruction.
pressure, liquid, grain, grinder, modeling, flow velocity
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