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关于弹丸焦形成机理的研究,国内外起步都比较晚,目前关于其深层的机理研究并不多。就国内而言,大多来源于炼油企业的生产报道,实验室研究较少,未形成成熟的理论体系。根据弹丸焦的形态及物性,提出了弹丸焦气相成核的动态过程,认为形成弹丸焦的本质原因是塔内气速过大,造成气相中焦粒(或前驱物)浓度过大,且停留时间过长。气相中的焦粒经融合、摩擦等过程后,最终形成弹丸焦。根据此机理,可以很好地统一解释各种影响弹丸焦形成的因素。该理论认为,塔内气速为原料性质、操作条件等因素的综合函数,是弹丸焦形成的关键因素之一。通过该机理,可以很好地解释弹丸焦生成过程中各种现象及其影响因素。塔内气速是弹丸焦生成的一个综合判据,它是原料性质、操作条件的函数。如果能够结合装置工况、原料性质等因素,通过流体动力学计算,拟合出弹丸焦生成的临界气速,可以对装置操作起到实质性的指导作用。
About the study of the formation mechanism of projectile coke, both at home and abroad started relatively late, but there are not many researches on its deep mechanism at present. For domestic terms, most of them come from the production reports of the oil refining enterprises, with few laboratory studies and no mature theoretical system. According to the shape and physical properties of projectile coke, the dynamic process of projectile pyrolysis phase nucleation is proposed. It is considered that the essential reason for the formation of projectile coke is that the gas velocity in the tower is too large, causing the concentration of coke particles (or precursors) in the gas phase to be too large, Over time. Gaseous particles in the coke after the fusion, friction and other processes, the final formation of projectile coke. According to this mechanism, various factors affecting the formation of projectile coke can be well explained. The theory holds that the gas velocity in the tower is a comprehensive function of the nature of raw materials and operating conditions and is one of the key factors in the formation of shot peening. Through this mechanism, it is possible to explain various phenomena and their influencing factors in the projectile coke generation process well. The gas velocity inside the tower is a comprehensive criterion for the formation of shot coke, which is a function of the nature of the feedstock and the operating conditions. If we can combine the conditions of the device, the nature of the raw materials and other factors, through the fluid dynamics calculation, fitting the critical gas velocity generated by the projectile coke can play a substantial role in guiding the operation of the device.