SBIR Phase I: Mitigation of Coke Deposits on Heat Transfer Surfaces Via Ion Implantation

* 9660075沃伦 本计画研究离子植入以改良商用金属合金之性质，以减缓在许多重要高温制程中，包括乙烯裂解、重油精炼、部分氧化及亚化学计量燃烧，在关键热传表面上所形成之触媒焦之成长。这些焦炭沉积物作为热裂化反应的副产物产生，并降低传热速率、热效率和反应器产物产率。工作将集中在离子注入选定的周期性元素，如碱金属/碱土金属，磷和铝，到商业合金，以抑制焦炭的形成：（一）促进碳的气化，（2）改变金属的催化活性，形成碳自由基，（3）阻碍渗碳过程。离子注入提供了一种更耐用的方法来处理关键的热传递表面，与传统的涂层技术（如电镀和等离子喷涂）竞争，因为它在极端的热环境下不太容易开裂和分层。在第一阶段，离子束注入的金属试样的焦化速率将与工业热裂解条件下的常规合金的数据进行比较，以评估该技术的有效性。第二阶段的工作将集中在使用新兴的离子注入技术，使应用到更复杂的几何形状，包括商业炉管的内部。 离子注入选定的元素，以减轻焦炭沉积在高温金属表面上，可以显着提高运行经济性和寿命的传热设备受到热裂化条件。 商业应用将包括热裂解炉管和燃烧器组件的处理。 ***

*** 9660075 Warren This project investigates ion implantation for modifying the properties of commercial metal alloys to mitigate the growth of catalytic coke which forms on critical heat transfer surfaces during many important high temperature processes including ethylene cracking, heavy oil refining, partial oxidation and substoichiometric combustion. These coke deposits are generated as byproducts of thermal cracking reactions and diminish heat transfer rates, thermal efficiencies, and reactor product yields. Work will focus on ion implantation of selected periodic elements, such as alkali/alkaline earth, phosphorous and aluminum, into commercial alloys to suppress coke formation by: ( I ) promoting the gasification of carbon, (2) altering the catalytic activity of metals for the formation of carbon radicals, and (3) impeding the process of carburization. Ion implantation offers a more durable method for treating critical heat transfer surfaces competed to conventional coating techniques such as electroplating and plasma spraying because it is less prone to cracking and delamination under extreme thermal environments. In Phase I, the coking rates of ion beam implanted metal coupons will be compared against data for conventional alloys under industrial thermal cracking conditions to assess the effectiveness of this technique. Phase II work will focus on use of emerging ion implantation techniques to allow application to more complex geometries including the inside of commercial furnace tubes. Ion implantation of selected elements to mitigate coke deposits on high temperature metallic surfaces can significantly improve the operating economy and life of heat transfer equipment subjected to thermal cracking conditions. Commercial applications will include treatment of thermal cracking furnace tubes and burner components. ***