Optimal designing of cracking tower for waste tires based on heat and mass transfer model(II) Optimal designing
In order to achieve maximum effective heat transfer area and heat transfer coefficient, some important parameters of a new cracking tower with multiple hollow disks were optimized on the basis of heat-mass transfer model developed in Part(Ⅰ), including the area overlapping ratio, rotating speed of axis, plow-setting coefficient, number and setting angle of plows, distance between plows.It was shown that the area-overlapping ratio was better in the interval of 0 to ξ_c.A higher rotating speed of axis was preferred provided that the quality of pyrolysis products was not affected.Multiple plows system was recommended in the design of a new cracking tower for waste tires.The distance between plows was optimal when the critical capacity values of all annular granular heaps were equal.The setting angle of 45° was helpful to decrease the drag force acting on plow and enhance mixing of granular heaps.