共查询到19条相似文献,搜索用时 312 毫秒
1.
对原来的甲醇催化剂升温还原情况进行分析,提出新的还原方案,产介绍了新方案在第二炉触媒还原中的还原情况。 相似文献
2.
4.
5.
通过对氨合成催化剂升温还原过程中水汽浓度测定方法的比较,能更准确地测定催化剂升温还原中的水汽浓度。合理地掌握催化剂升温还原的进度和时间,使催化剂还原后的活性更好。 相似文献
6.
φ600-XF-ⅢJ型氨合成塔内件及“AC”型氨合成催化剂在我省小氮肥厂使用时间不长,经验较少。启东化肥厂今年元月对此内件催化剂升温还原,效果还是比较好的,可资参考。但费时较多,关键是还原初期、主期热点温度控制低了,尤其在450℃时,一度停留不进是不当的。该文还提出了新的升温还原方案,加快了升温速率,比原来122h缩短了时间,可供参考。但各厂在升温还原各个阶段催化剂热点和底层温度的掌握上,在主期和末期时间的掌握上,尤其是采用其它型号如A_(201),HG-1等低温高活性催化剂时,应按各厂的具体情况制订升温还原方案。 相似文献
7.
介绍了氨合成工艺流程和设备配置,论述了DNCA型氨合成催化剂的物理特性和应用情况,详细阐述了DNCA催化剂的装填要领、升温还原方案及注意事项,结合生产运行工艺指标和操作控制要点,对DNCA催化剂使用效果进行了总结。 相似文献
8.
介绍了铜基甲醇催化剂高氢升温还原方案、注意事项以及实际操作中一定要控制住水汽浓度这一关键指标的方法,以保证升温还原的成功。 相似文献
9.
10.
11.
介绍了NC501型甲醇催化剂的装填数据、测温点分布和升温还原方案,论述了该催化剂的还原过程和生产运行情况,通过NC501型和C207型两炉催化剂生产运行数据的对比,对NC501型催化剂的使用效果进行了总结。 相似文献
12.
13.
The effective simulation of the fluid catalytic cracking (FCC) operation requires a good understanding of many factors such as, reaction kinetics, fluid dynamics, and feed and catalyst effects. The different product slates that can be obtained are the consequence of a complex reaction scheme including cracking, isomerization, hydrogen transfer, oligomerization, etc. Furthermore, the catalyst deactivation may affect each one of the reactions in different ways, which creates an additional reason for different variation with time-on-stream of the yield to each product. On the basis of the experimental data of the FCC pilot plant operated in Chemical Process Engineering Research Institute (CPERI, Thessaloniki, Greece), a lumping model was developed for the prediction of the FCC product distribution. The lumped reaction network involved five general lumps (gas oil, gasoline, coke, liquefied product gas, and dry gas) to simulate the cracking reactions and to predict the gas oil conversion and the product distribution. The paths of catalyst deactivation were studied and a selective deactivation model was adopted that enhances the fundamentality and accuracy of the lumping scheme. The hypothesis of selective catalyst deactivation was found to improve the product slates prediction. Models with different assumptions were examined, regarding the behavior of the catalyst, as deactivated, and its effect on the reactions of the lumping scheme. A large database of experiments, performed in the FCC pilot plant of CPERI was used to verify the performance of the models in steady state unit operation. The simulation results depict the importance of incorporating selective catalyst deactivation functions in FCC lumping models. 相似文献
14.
介绍了优化催化剂选择和使用方案对硫酸装置运行的积极影响。通过更换高活性催化剂可以提高硫酸装置进气浓度,解决床层压降快速升高的问题;装填防尘催化剂能起到降低床层压降、减少电耗,延长装置运行周期的目的;通过在末段使用低温高活性催化剂可以缩短开车时间,减少燃料消耗;使用高活性催化剂还可以减少尾气吸收装置的碱消耗,几种方案联合使用会取得更好的效果。 相似文献
15.
16.
17.
对轴径向氨合成塔运行中出现的同平面温差大和径向层入口温度偏低等问题进行了分析探讨,提出了稳定操作、净化气体成份、改进触煤装填方案、提高内件组装质量等建议。 相似文献
18.
乙炔加氢反应器是乙烯工业中用于除去高浓度乙烯流中的少量乙炔的重要装置,该装置一般持续运行较长时间,期间反应器内催化剂活性逐渐降低,直至活性难以满足工艺要求。乙炔加氢反应器全周期操作优化一般是针对装置的一个再生周期进行的,在装置运行周期内应按照操作优化方案进行。但是,在实际工业过程中,为了满足临时的工艺调度需求,乙炔加氢反应器在按照操作优化方案运行一定时间后,需要在剩余的运行周期内临时改变操作方案,这给操作优化问题带来了更多变化和挑战。基于裕量估计和慢时变系统的控制优化框架,研究了这类在运行周期中临时改变操作优化方案的全周期动态优化问题。改变操作优化方案的方式包括:变更运行周期、追求经济效益最大化和变更优化目标、追求运行周期最大化。通过对这两种改变操作优化方案的分析,发现前者变更的运行周期越接近原定运行周期,全周期总经济效益越高,后者切换时刻越早,反应器能维持的运行周期越长,但二者的全周期经济效益均不及原操作优化方案,临时的工艺调度对乙炔加氢反应器的全周期优化运行总体上是不利的。 相似文献
19.
A new hydrodealkylation process with fluid-beds to produce high purity naphthalene and methylnaphthalenes from heavy aromatic oils 总被引:1,自引:0,他引:1
By use of fluid-bed technology, direct hydrodealkylation of heavy oils was studied and a new process to produce high purity naphthalene and 2-methylnaphthalene was developed. As a basic research, catalyst activity, selectivity and stability for hydrodealkylation of heavy oil, hydrodealkylation reaction scheme and kinetics and coke formation kinetics and mechanism were investigated. Reaction rate constants were theoretically analyzed with fluid-bed consecutive reaction model. These research and analyses were utilized for optimization and design of the process. Pilot operation provided high yield and quality of the products which were suitable for synthesis of monomers for high performance polymers. 相似文献