The mixing aspects of NiMo and CoMo hydrotreating catalysts in ebullated-bed reactors

Recently, the Shuaiba Refinery of Kuwait National Petroleum Company (KNPC) conducted a test run using mixed NiMo/CoMo catalysts in one of the H–Oil reactors to verify the specifications of a CoMo catalyst. However, reduced unit performance and unstable operation were experienced. This led to the unit shut-down and process time loss. To search the causes for the different reactor behaviours, a research work was undertaken in the Petroleum Technology Department at Kuwait Institute for Scientific Research (KISR). It had found that the hydrodynamics of the mixed NiMo/CoMo and CoMo catalysts in a cold flow ebullated-bed reactor (EBR) were very different than NiMo catalyst alone.     

沸腾床渣油加氢技术现状及前景分析

渣油加氢是解决重质劣质原油加工最合理有效的方法,它以其技术成熟、产品收率高、投资回报率高,得到越来越广泛的应用.沸腾床渣油加氢能达到较高的脱杂质率和转化率,并能长周期稳定运转,近年来发展迅速.对其工艺、催化剂和前景等进行介绍和分析,沸腾床渣油加氢符合当前重油深加工的发展需要,能够创造更大的效益.     

Pressure and temperature effects on the hydrodynamic characteristics of ebullated-bed systems

Experiments were performed to study the hydrodynamic characteristics of ebullate-bed systems operated under conditions of high pressure and temperature. The effects of these variables on bed porosity and the liquid minimum fluidization velocity were determined and a correlation has been proposed as a criteria for determining flow regime transitions between the dispersed and coalesced bubble flow regimes. The bed porosity has been described with the pseudo-fluid model. The minimum fluidization velocity data were contrasted with predictions from empirical correlations reported in the literature.     

煤焦油沸腾床加氢工艺的研究

随着经济的发展,国内的资源紧张,再度引起人们对煤焦油加工的关注。煤焦油这种劣质油的生产条件较为苛刻,这对煤焦油的加氢带来了困难,而沸腾床-固定床组合加氢技术比较适合这种劣质油的加工,幵阐述了该工艺收率高、操作平稳、环境污染少的优势。     

Catalyst attrition in ebullated-bed hydrotreator operations

The catalyst level of the ebullated-bed is an important process indicator in operating the H-oil hydrotreating unit in Shuaiba Refinery, Kuwait National Petroleum Company (KNPC). In an attempt to use mixed hydrotreating catalysts in one of the H-oil reactors, the catalyst bed expanded more than usual, and the level was very unstable. Moreover, a reduced unit performance and unstable operations were resulted, which led to the unit shut down and process time loss. In a joint study between the Petroleum Technology Department at Kuwait Institute for Scientific Research (KISR) and KNPC, the hydrodynamics of the mixed and individual catalysts in a cold flow ebullated-bed reactor (EBR) were found to be very different, though the two catalysts had similar physical properties. Further study revealed that catalyst attrition was a very important factor in contributing such reactor behaviours.