催化裂化烟气轮机结垢机理分析及流场模拟

发布时间：2018-06-08 06:40

本文选题：催化裂化 + 烟气轮机　；参考：《华东理工大学》2015年硕士论文

【摘要】：针对近年来炼厂中出现催化裂化烟气轮机内结垢严重的问题展开了研究。首先采用SEM、EDS和ICP-AES等测试方法分析了垢样的物性,得出垢样主要是由催化剂颗粒组成,此催化剂为硅铝酸盐催化剂,其中含有Na、S、Si、Fe等金属元素及La、Se等稀土元素,并以其为活性组分,并分析了这些金属元素对结垢的影响；高温烟气带入烟机的颗粒粒径均匀分布于1-10μm之间,然而在烟机内部运动的过程中,其中只有粒径在1-2μm之间的催化剂颗粒能被动叶表面吸附,并沉积在其表面形成垢。同时从催化剂颗粒在烟机内部表面,尤其是动叶表面沉积时的受力情况出发,研究了烟机结垢的机理。还通过CFD对烟机内部流场进行模拟,得出叶片根部压力面周围烟气的相对速度最低；催化剂浓度随着叶高的降低逐渐升高,在动叶叶根处颗粒浓度急剧升高,催化剂导致催化剂颗粒在动叶叶根处集聚,造成在动叶叶根处更易结垢,与现场检测结果相吻合。最后根据这些影响因素提出了一些防护措施与改进方案,以达到抑制或者减轻烟气轮机结垢的目的。
[Abstract]:The problem of serious scaling in FCC flue gas turbine in recent years was studied. Firstly, the physical properties of scale samples were analyzed by means of SEMMA-EDS and ICP-AES. The results showed that the scale samples were mainly composed of catalyst particles. The catalyst consisted of aluminosilicate catalyst, which contained metal elements such as NaOH, Si-Fe and La-Se, and used them as active components. The influence of these metal elements on the scaling is analyzed. The particle size of the high temperature smoke brought into the cigarette machine is between 1-10 渭 m, however, in the process of the internal movement of the smoke machine, the particle size of the particle is between 1 渭 m and 10 渭 m. Only catalyst particles with a particle size of 1-2 渭 m can be adsorbed on the passive leaf surface and deposited on the surface of the catalyst to form scale. At the same time, the mechanism of fouling was studied based on the stress of catalyst particles deposited on the inner surface of tobacco machine, especially on the surface of moving blade. The relative velocity of the flue gas around the pressure surface of the blade root was the lowest, and the concentration of catalyst increased gradually with the decrease of the leaf height, and the particle concentration increased sharply at the root of the moving leaf. The catalyst leads to the agglomeration of catalyst particles at the root of the moving leaf, which makes it easier to scale at the root of the leaf, which is consistent with the field test results. Finally, according to these influencing factors, some protective measures and improvement schemes are put forward in order to restrain or reduce the fouling of flue gas turbine.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE96

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