报告人: 张国泰教授，Technip USA INC.
报告题目: OPTIMIZATION OF REFORMER INLET TEMPERATURE BASED ON THERMAL CRACKING OF FEEDSTOCKS
时间: 2011月11月10日(周四)上午10:00
地点: 实验16楼106会议室
报告人简介:
张国泰校友是世界五大工程公司之一――塔西尼普工程（美国）公司（Technip USA INC.）乙烯专家（Main Expert）。张国泰教授八十年初前往美国俄勒岗州立大学进修，师从美国工程院院士列文斯比尔教授。后应聘至公司工作，专攻乙烯技术，成为业内专家。张国泰教授著有4本专著及三十余篇技术论文。
报告摘要(Abstract)
Syngas is typically produced by steam reforming of hydrocarbons (HC). The reformer which is the heart of this process consists of the radiant section containing the catalyst tubes and the convection section for waste heat recovery. The mixed feed (steam plus hydrocarbon) is preheated in the convection section and the preheated mixed feed is sent to the catalyst tubes through crossover piping. Cracking reactions can take place either in the convection coil or the crossover piping. The cracking reactions which take place in the cross over piping are adiabatic cracking reactions. Furthermore, there are non-adiabatic cracking reactions that occur in the mixed feed before entering into that zone, which is caused by absorbing heat from the hot flue gas generated in the syngas reformer.
These extent of both the non-adiabatic cracking reaction in the convection section and adiabatic cracking reaction in the adiabatic zone depend on the hydrocarbon feed type, steam/carbon mole ratio, mixed feed inlet temperature, mixed feed inlet pressure, and mixed feed residence time in the adiabatic zone, etc.
The objectives of this study is to explore the parameters which will affect the cracking of reformer feedstocks, seeking the cracking order for different hydrocarbon feed components, and finding the suitable reformer feed inlet temperature for a certain feed to optimize the reformer control.
Reformer feedstocks used in the study are naphtha, butane fractions and liquified natural gas (LNG). A Temperature Index (TI) was introduced to quantify the thermal cracking in the adiabatic zone. The effects of reformer feed temperature and pressure, feed residence time in the crossover volume as well as steam/carbon molar ratio on the thermal cracking were determined. The ranges of these parameters used in the study are 460 - 590 oC (reformer inlet temperature), 23.7 – 31.7 kg/cm2-g (reformer inlet pressure), 0 – 8 seconds (residence time in the crossover volume) and 3.0 - 3.5 (steam/carbon molar ratio).
During our study, a method was developed to find the TI and CI for different reformer feedstocks at various process conditions. This can be used to predict the extent of cracking that takes place for a given set of parameters. The amount of light olefins at the exit of convection section and the light olefins formed in the crossover volume as well as the light olefins containing in the reformer inlet mixed feed can be determined. The mixed feed temperature reduction through the crossover volume can also be found.