炼油厂含苯系物污水处理工艺模拟研究
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摘要
为了实现炼油厂含苯系物污水的回收利用,提出了液液萃取-汽提联合处理工艺。应用Aspen Plus对该工艺流程进行模拟,采用UNIQUAC物性方法,分析了抽余油用量、汽提蒸汽量等主要工艺参数对污水处理效果的影响。模拟结果表明,含苯系物污水经联合工艺处理后,净化水主要污染物含量低于饮用水标准限值,可作为新鲜水供炼厂回用;抽余油萃取了污水中的油和苯系物之后,依然满足该炼油厂对抽余油的质量要求,可按原计划送往下游装置。本工艺过程未产生二次污染,达到零排放的环保目标。
In order to recycle the wastewater containing benzene, toluene, ethylbenzene and xylene(BTEX) from the refinery, a combined process consisting of Liquid-liquid Extraction(LLE) followed by Steam Stripping(SS) is proposed. Aspen Plus is used to simulate this combined process and the property method is specified as UNIQUAC to analyze the effect of aromatics extraction raffinate oil flow rate and stripping steam flow rate on wastewater treatment. The result shows that the major pollutants in the treated water meet the requirements of the standard GB 5749, and the water can be reused by the refinery. After the treatment process, the raffinate oil used as extractant still satisfies the quality requirement of the refinery. Therefore, the zero emission target is achieved by the combined process.
In order to recycle the wastewater containing benzene, toluene, ethylbenzene and xylene(BTEX) from the refinery, a combined process consisting of Liquid-liquid Extraction(LLE) followed by Steam Stripping(SS) is proposed. Aspen Plus is used to simulate this combined process and the property method is specified as UNIQUAC to analyze the effect of aromatics extraction raffinate oil flow rate and stripping steam flow rate on wastewater treatment. The result shows that the major pollutants in the treated water meet the requirements of the standard GB 5749, and the water can be reused by the refinery. After the treatment process, the raffinate oil used as extractant still satisfies the quality requirement of the refinery. Therefore, the zero emission target is achieved by the combined process.
引文
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[2] BAHADAR H,MOSTAFALOU S,ABDOLLAHI M.Current Understandings and Perspectives on Non -cancer Health Effects of Benzene:A Global Concern[J].Toxicol Appl Pharmacol,2014(2):83-94.
[3] 王禹,钟大辉.Fenton氧化法处理苯乙烯装置废水[J].化学工程,2014(5):10-12,38.
[4] 张博雯,纪奕辉,王春春,等.Fenton法处理高浓度焦化废水对COD影响因素的探究[J].广东石油化工学院学报,2017(3):27-30.
[5] LI L,SONG C,HUANG Y,et al.Investigation of BTEX Removal Efficiency Using the Electrolytic Oxidation and Fenton’s Reaction[J].Journal of Water Chemistry and Technology,2016(3):149-157.
[6] MAZZEO D E,LEVY C E,de ANGELIS D.et al.BTEX Biodegradation by Bacteria from Effluents of Petroleum Refinery[J].Sci.Total Environ,2010(20):4334-4340.
[7] FIRMINO P I M,FARIAS R S,Barros A N,et al.Applicability of Microaerobic Technology to Enhance BTEX Removal from Contaminated Waters[J].Appl Biochem Biotechnol,2018(4):1187-1199.
[8] RAMTEKE L P,GOGATE P R.Improved Treatment Approach for the Removal of Aromatic Compounds Using Polymeric Beads in Fenton Pretreatment and Biological Oxidation[J].Environ Sci Pollut Res Int,2016(20):20281-20296.
[9] 秦继华,付丽洋,何自勇,等.多级氧化协同生化处理高浓度苯系物废水的研究[J].污染防治技术,2017(1):12-14,19.
[10] 曹湘洪.在AspenTech China 2003信息化论坛暨中国用户会上的演讲合作*发展*开创新局面[EB/OL.(2007-08-22)[2019-01-03].http://www.wanfangdata.com.cn/details/detail.do?_type=conference&id=6311368#.
[11] 赵莹莹.ASPEN PLUS软件在炼油厂含硫污水汽提过程中的应用[J].炼油设计,1998(5):48-51.
[12] CHEN Y,WANG H M,LV R,et al.Liquid-liquid Equilibrium for Ternary Systems,Methyl Isobutyl Ketone t (Catechol,Resorcinol and Hydroquinone) T Water at 333.15 K,343.15 K and 353.15 K[J].Fluid Phase Equilibria,2017,433:206-211.
[13] 徐承恩.催化重整工艺与工程[M].2版.北京:中国石化出版社,2014.
[14] SEADER J D ,HENLEY E J,ROPER D K.Separation Process Principles:Chemical and Biochemical Operations[M].3rd ed.America:John Wiley & Sons,2010.
[15] 孙兰义,马占华,王志刚,等.换热器工艺设计[M].北京:中国石化出版社,2015.
[16] 刘家祺.传质分离过程 [M].2版.北京:高等教育出版社,2014.
[17] 茂名市发展和改革局.关于调整市区污水处理费暨简化自来水分类价格的通知[EB/OL].(2017-02-10)[2018-12-28].http://www.mmwater.cn/newsshow.php?pid=2&cid=25&id=702.
[18] 中国化工产品网.2018年12月26日汽柴油价格行情[EB/OL].(2018-12-26)[2018-12-28].http://www.chemcp.com/news/201812/907939.asp.
[19] 佚名.中石油揭秘美国油价比中国便宜的内幕[EB/OL].(2016-02-16)[2019-01-03].http://finance.sina.com.cn/stock/usstock/c/20160216/180424293871.shtml.
[20] 全国大学生化工设计竞赛委员会秘书处.2018“东华科技-陕鼓杯”第十二届全国大学生化工设计竞赛设计任务书[EB/OL].(2018-02-14)[2018-12-28].http://iche.zju.edu.cn/redir.php?catalog_id=53&object_id=84695.