陕北气田甲醇回收塔腐蚀结垢特性研究
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摘要
为考察陕北气田甲醇回收塔腐蚀结垢情况,确保系统高效、安全生产,在对现场水质分析的基础上,通过现场试验,对比20R、J55、A3、N80、L316 5种钢材在回收塔上、中、下3层的腐蚀情况;以现场水样作为腐蚀介质,结合回收塔腐蚀结垢产物分析、室内动态腐蚀实验、电化学实验结果解析甲醇回收系统腐蚀结垢机理。研究结果表明,甲醇回收塔腐蚀较严重,回收塔由上至下层位腐蚀依次加重; 80℃时,在20R与L316接触区域,20R钢腐蚀加重,L316腐蚀速率为零,无腐蚀现象; 20R腐蚀监测挂片点蚀严重,其上的腐蚀产物主要以氧、铁原子为主,溶解氧是引起甲醇回收系统腐蚀的主要因素之一。鉴于此,针对性地提出甲醇回收塔的腐蚀防治对策:回收塔与塔座接触区域在经济允许条件下使用L316,避免与20R接触从而加重腐蚀;选择投加高效能缓蚀剂可以有效减缓腐蚀。
In order to investigate the corrosion and scaling of the methanol recovery tower in the North Shaanxi gasfield to ensure the efficient and safe production of the system,on the basis of the field water quality analysis,the corrosion of 5 kinds of steel materials 20 R,J55,A3,N80 and L316 in the upper,middle and lower 3 layers of the recovery tower was studied through the field tests. The corrosion and scaling mechanism of the methanol recovery system was analyzed using the field water sample as the corrosion medium,according to the analysis of the corrosion and scaling products of the recovery tower,the indoor dynamic corrosion experiments and the electrochemical experiment results. The results show that the corrosion of the methanol recovery tower is more serious,and the corrosion of the recovery tower is aggravated from top to bottom in turn; at 80 ℃,in the contact area of 20 R and L316,the corrosion of 20 R steel is serious while L316 is not corroded. There is serious pitting on 20 R coupons,the main corrosion products are oxygen and iron atoms,and dissolved oxygen is one of the main factors that cause the corrosion of the methanol recovery system. For this reason,the countermeasures for the corrosion prevention and control of the methanol recovery tower are put forward. Under the condition of economic permissibility,L316 steel is used in the contact area between the recovery tower and the tower pedestal to avoid contacting with 20 R; the efficient corrosion inhibitor can be used to effectively reduce corrosion.
In order to investigate the corrosion and scaling of the methanol recovery tower in the North Shaanxi gasfield to ensure the efficient and safe production of the system,on the basis of the field water quality analysis,the corrosion of 5 kinds of steel materials 20 R,J55,A3,N80 and L316 in the upper,middle and lower 3 layers of the recovery tower was studied through the field tests. The corrosion and scaling mechanism of the methanol recovery system was analyzed using the field water sample as the corrosion medium,according to the analysis of the corrosion and scaling products of the recovery tower,the indoor dynamic corrosion experiments and the electrochemical experiment results. The results show that the corrosion of the methanol recovery tower is more serious,and the corrosion of the recovery tower is aggravated from top to bottom in turn; at 80 ℃,in the contact area of 20 R and L316,the corrosion of 20 R steel is serious while L316 is not corroded. There is serious pitting on 20 R coupons,the main corrosion products are oxygen and iron atoms,and dissolved oxygen is one of the main factors that cause the corrosion of the methanol recovery system. For this reason,the countermeasures for the corrosion prevention and control of the methanol recovery tower are put forward. Under the condition of economic permissibility,L316 steel is used in the contact area between the recovery tower and the tower pedestal to avoid contacting with 20 R; the efficient corrosion inhibitor can be used to effectively reduce corrosion.
引文
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[16]曹楚南.电化学阻抗谱(EIS)在金属腐蚀与防护研究中的应用[C]∥腐蚀与控制:第三届海峡两岸材料腐蚀与防护研讨会论文集.北京:化学工业出版社,2002:16-17.
[2]李谦定,于洪江,王佩华,等.陕北气田含醇污水综合处理方案的几点建议[J].油气田地面工程,2002,21(5):64.
[3]李勇.长庆气田含甲醇污水处理工艺技术[J].天然气工业,2003,23(4):112-115.LI Yong. Processing techniques of waste water with methyl alcohol in Changqing gas field[J]. Natural Gas Industry,2003,23(4):112-115.
[4]吕乃欣,高燕,尹成先,等.陕北天然气处理厂甲醇回收系统堵塞原因分析[J].石油化工高等学校学报,2012,25(1):22-25.LV Naixin,GAO Yan,YIN Chengxian,et al. The analysis on the blockage reason of methanol-reclaiming system in Shanbei gas filed[J]. Journal of Petrochemical Universities,2012,25(1):22-25.
[5]秦永妮,李春福,尤郭群.高温高压下CO2对N80钢的腐蚀实验研究[J].全面腐蚀控制,2008,22(6):19-21.QIN Yongni,LI Chunfu,YOU Guoqun. Experiment study of corrosion of N80 steel under high temperature and high pressure[J]. Total Corrosion Control,2008,22(6):19-21.
[6] ZHANG Guoan,LIU Dawei,GUO Xingping,et al. Corrosion behaviour of N80 carbon steel in formation water under dynamic supercritical CO2condition[J]. Corrosion Science,2017,120:107-120.
[7] YU H,ZHENG Yg,YAO Zm. The cavitation erosion and erosion-corrosion behavior of carbon steel in simulating solutions of three rivers of China[J]. Materials and Corrosion,2006,57(9):705-714.
[8] WANG Jingang,GAO Hao. Experimental study of influence factors on carbon dioxide corrosion[J]. Advanced Materials Research,2012,1670(468):1702-1705.
[9] AMRI J,GULBRANDSEN E,NOGUEIRA R P. The effect of acetic acid on the pit propagation in CO2corrosion of carbon steel[J]. Electrochemistry Communications,2008,10(2):200-203.
[10]王立友.典型供水金属管材电化学腐蚀及对水质影响的研究[D].哈尔滨:哈尔滨工业大学,2015:20-40.
[11]潘一,孙林,杨双春,等.国内外管道腐蚀与防护研究进展[J].腐蚀科学与防护技术,2014,26(1):77-80.
[12]薛丹,胡敏.陕北气田气井腐蚀速率影响因素及规律[J].表面技术,2016,45(2):169-174.XUE Dan,HU Min. Factors and rules affecting gas well corrosion rate in Shanbei gas field[J]. Surface Technology,2016,45(2):169-174.
[13]王伟华,龙永福,徐艳丽,等.红井子作业区腐蚀结垢机理及阻垢缓蚀剂研究[J].长江大学学报(自科版),2016,13(16):11-17.WANG Weihua,LONG Yongfu,XU Yanli,et al. The mechanism of corrosive scaling and study on its inhibitor in Hongjingzi operation area[J]. Journal of Yangtze University(Natural Science Edition),2016,13(16):11-17.
[14]田辺弘往,篠原稔雄. Influence of dissolved oxygen on the corrosion behavior of coated steel(I)[J]. Journal of the Japan Society of Colour Material,1981,54(8):469-473.
[15]王期超,黄燕滨,巴国召,等.镍磷-多壁碳纳米管化学复合镀层的耐蚀性能[J].腐蚀科学与防护技术,2017,29(1):59-62.WANG Qichao,HUANG Yanbin,BA Guozhao,et al. Corrosion resistance of electroless Ni-P-multi-walled carbon nanotubes composite coatings[J]. Corrosion Science and Protection Technology,2017,29(1):59-62.
[16]曹楚南.电化学阻抗谱(EIS)在金属腐蚀与防护研究中的应用[C]∥腐蚀与控制:第三届海峡两岸材料腐蚀与防护研讨会论文集.北京:化学工业出版社,2002:16-17.