催化裂化可再生湿法烟气脱硫工艺应关注的工程问题

典型的已工业化的催化裂化可再生湿法烟气脱硫技术有DuPontTMBELCO公司的LABSORBTM工艺和Shell Global Solutions公司的CANSOLV工艺,对两者的主要技术指标和技术特点进行了对比。介绍了由中国石化集团洛阳石油化工工程公司自主研发的RASOC工艺与工程技术的主要特点,同时对成都华西化工科技股份有限公司开发的离子液循环法烟气脱硫技术进行了阐述。着重分析了可再生湿法烟气脱硫技术在催化裂化装置上应用时对上游催化烟机、余热锅炉或CO锅炉的影响以及对下游硫黄回收装置操作参数和规模的影响。指出吸收剂(洗涤液)是可再生湿法烟气脱硫技术的核心技术,决定了烟气脱硫技术的先进性,决定了烟气脱硫装置的工程投资和能耗。国产化可再生湿法烟气脱硫技术用于催化裂化装置烟气脱硫的工程技术开发还有待于进一步提高,需要结合催化裂化装置的特点,重点解决长周期运行、设备平面布置和占地、工程投资、装置能耗和生产成本等问题。在催化裂化装置上实施可再生湿法烟气脱硫技术,需要综合考虑对上游催化烟机、余热锅炉或CO锅炉的影响以及对下游硫黄回收装置的影响,形成催化裂化装置、烟气脱硫装置、硫黄回收装置一体化的解决方案。

Important engineering issues in FCC regenerable wet flue gas scrubbing process

The two typical and industrialized FCC regenerable wet flue gas scrubbing processes i.e.LABSORBTM process of DuPontTM BELCO and CANSOLV process of Shell Global Solutions are introduced and the main technical indexes and technical features of the two processes are compared.The main characteristics of RASO process and associated engineering technologies developed by SINOPEC Luoyang Petrochemical Engineering Corporation are described,and the ion liquid recycle flue gas scrubbing process developed by Chengdu Huaxi Chemical Technology Co.,Ltd.are discussed.The impacts of application of regenerable wet flue gas scrubbing process in FCC units on the upstream flue gas expander,waste heat boiler or CO boiler and on operating parameters and capacity of the downstream sulfur recovery unit are studied in detail.It is pointed out that the absorbent(scrubbing liquid) is the core technology of the regenerable wet flue gas scrubbing process,which determines the advance of the technology as well as capital investment and energy consumption of the flue gas scrubbing unit.The engineering technologies for application of regenerable wet flue gas scrubbing technology in FCC unit need to be further improved in respect of long-term operation,equipment layout & plot area requirement,capital vestment,energy consumption and operating costs,etc.When selecting the regenerable wet flue gas scrubbing for FCC unit,the impacts on upstream flue gas expander,waste heat boiler or CO boiler and the downstream sulfur recovery unit have to be considered to design FCC unit,flue gas scrubbing unit and sulfur recovery unit into an integrated complex.