Abstract
In order to improve the performance of the pneumatic conveying system, an injection port is mounted on the particle suction nozzle unit to fluidize the particle bed before the particles are fed into the conveying pipe. Experiments were carried out on the suction nozzle mounted at the injection port the inner diameter ratios of the injection pipe to the suction mouth of which are 0.1, 0.2 and 0.3. For the diameter ratio of 0.2, the effects of the injection flow are discussed compared with when there is no injection flow. As a result, the loading ratio increases by means of the injection port mounted on the suction nozzle. It was clarified by the experiments that the nozzle efficiency shows its maximum value when the inner diameter ratio is 0.2. When the inner diameter ratio is smaller than 0.2, the nozzle efficiency shows a smaller value because of higher pressure loss. On the other hand, when the diameter ratio is larger than 0.2, the efficiency also decreases because of the reduction in the effective area of suction flow.
