CAJ | 학술논문

采用化学气相沉积法在裂解炉管内表面沉积纯硅、硅铬、硅铝或硅铈的氧化物涂层，对涂层进行了SEM和EDS表征，并对其抗结焦性能进行了评价。实验结果表明，纯硅气相沉积得到球状颗粒氧化硅涂层，并含有大量C元素杂质；硅铈气相共沉积得到含有较少C元素的球状颗粒氧化硅涂层；硅铬气相共沉积可以减少涂层中的C元素，得到均匀致密的氧化硅涂层；硅铝气相共沉积后裂解炉管表面只有部分覆盖氧化硅涂层。硅铬氧化物涂层在6周期的石脑油水蒸汽热裂解评价中，结焦抑制率保持在80％以上。
채용화학기상침적법재렬해로관내표면침적순규、규락、규려혹규시적양화물도층，대도층진행료SEM화EDS표정，병대기항결초성능진행료평개。실험결과표명，순규기상침적득도구상과립양화규도층，병함유대량C원소잡질；규시기상공침적득도함유교소C원소적구상과립양화규도층；규락기상공침적가이감소도층중적C원소，득도균균치밀적양화규도층；규려기상공침적후렬해로관표면지유부분복개양화규도층。규락양화물도층재6주기적석뇌유수증기열렬해평개중，결초억제솔보지재80％이상。
Composite silica-based coatings for anti-coking in the steam cracking of naphtha were prepared by chemical vapor deposition on the internal surface of cracking furnace tube with chromium oxide,cerium oxide and alumina separately. The anti-coking performances of the coatings,namely silica,silicon-chromium oxides,silicon-cerium oxides and silica-alumina,were investigated through cracking experiment and by means of EDS and SEM. Spherical silica particle coating containing a great deal of C were prepared through the vapor deposition of pure silica-based compound. Spherical silica particle coating with less C was obtained by the vapor deposition of silicon-cerium compounds. Uniform and dense silicon-chromium oxide coating was obtained by the vapor deposition of silicon-chromium compounds. Only a part of the tube was covered with silica after the vapor deposition of silicon-aluminum compounds. The coking inhibition rate of the cracking furnace tube with the composite silicon-chromium oxide coating was maintained above 80% in six circles of the steam cracking.