为满足国V汽油标准对车用汽油硫质量分数的要求,中国石油大港石化公司对原采用Prime-G+技术的750 kt/a催化汽油加氢脱硫装置进行了改造.改造的主要内容:增设与原重汽油加氢脱硫工艺流程完全相同的第二段加氢脱硫部分;降低轻汽油切割比例;增设脱砷反应器;增设热分离罐.改造后对装置运行情况进行标定,除要求脱后汽油中硫质量分数按15μg/g进行标定外,其他主要参数的标定结果如氢耗为2.0 kg/t催化原料、液体收率为100％、研究法辛烷值损失1.4单位、马达法辛烷值损失为0.3单位、烯烃体积分数降低5.5百分点等均优于设计值,表明Prime-G+工艺技术成熟可靠,采用的催化剂活性高、选择性好.

This paper introduced the sour water stripping processes including double column pressurized stripping ,single column pressurized stripping with side draw-off ,and single column with low pressure stripping . The problems of high alkali contents in the stripping purified water and excessive stripping in the existing processes were pointed out .A new method with liquid phase side draw-off ,namely in the acid water stripper from the higher to the lower position being sequentially arranged 1# ,2# alkali free reused water line and alkali injection line ,was provided .The water in the 1# line has relatively high NH3 ,H2S content ;therefore it can be used as the make-up water in the hydrogenation cracking or the catalytic cracking units .The water in the 2# line has relatively low NH3 ,H2S content ;therefore it can be used in the hydrotreating or the crude oil units .The method provides various degrees of stripping according to different water quality requirements from different units ,so as to avoid unnecessary stripping steam consumption . Therefore , the proposed method could achieve the goal of reducing energy consumption under the premise of no alkali in the reused w ater .

烃类水蒸气转化法制氢,管材中最容易出现缺陷甚至导致灾难性后果的部分是转化炉管与中变气管线.对2处管线进行的强化作用均用到了Nb元素.对Nb元素在2种管线中的强化机理和实际应用效果进行论述与比对.

The CDU/VDU at Dagang Petrochemical Company had crude distillation capacity of 5.0Mt/a and vacuum distillation capacity of 3.25Mt/a after the modification in 2004.After 7 years' operation,there were some problems including packing corrosion,low vacuum of overhead and coking in over evaporation section.In June 2012,the vacuum tower was revamped.The side-draw could be clearly cut and the total draw was improved from 51%~52%to 61%~63%,achieving good results.

This article provides a comprehensive treatment of the effluvial gas of sour water feed tanks.Different from normal treatment such as adsorption,absorption or condensation,and based on the process characteristics of sour water stripper,this method decreases the volatile components content maximally by changing process flow and operating conditions.The main measures include:① The operating pressure of sour water degassing drum is kept as low as possible(0.05-0.1MPa);② Sour water in degassing drum is heated to 55-60℃ using low temperature waste heat of purifying water from the stripping bottom to make the degassing drum operated in higher temperature.③ The first,second and third stage condensate liquid in single stripping tower or the return liquid from ammonia stripping reflux drum in double stripping tower is sent to a recycle liquid surge drum,and then is pumped to the outlet pipe of sour water feed pump;④The thickness of oil layers in sour water feed tanks increases to 600-900mm to form oil seal,preventing H2S or other effluvial compounds running out of the sour water feed tanks.After the above measures are taken,there would have no effluvial gas discharging from the sour water feed tanks in normal operating conditions.This method has several advantages,such as no need of additional adsorbent,absorbent or coolant,low investment and operation cost,simple operation and no secondary pollution.

在没有标准管件可用的情况下,大口径管道上直接开孔焊接支管是管道设计时经常会遇到的问题,由于开孔面积较大,需要对开孔处进行详细核算以确定是否需要补强。若需要补强,要根据具体情况、相关标准规范来进行计算和判断,找出最适合的补强方式,并根据计算补强的具体参数要求进行开孔补强,核算结果的准确与否及开孔补强是否足够将影响管道的安全平衡运行。常规的大管道开孔补强分析计算有:根据规范及经验公式进行计算及判断、CAESARⅡ软件详细应力分析、按设备有限元进行分析计算等方式。从生产实际入手,针对某原油管线抢修项目中遇到的实际问题,利用CAESARⅡ软件对大口径管道的开孔补强进行了详细解析,提出了相应的解决方案及处理措施。