石油化工腐蚀与防护
石油化工腐蝕與防護
석유화공부식여방호
PETROCHEMICAL CORROSION AND PROTECTION
2011年
6期
54-58
,共5页
丁颖%施伟力%张蔚%李伟
丁穎%施偉力%張蔚%李偉
정영%시위력%장위%리위
连续重整%碱液管%316L%腐蚀失效
連續重整%堿液管%316L%腐蝕失效
련속중정%감액관%316L%부식실효
CCR%alkaline liquid line%316L pipeline%corrosion failure
中国石化上海高桥分公司炼油事业部炼油作业五区连续重整装置再生气放空管道由碳钢改为316L不锈钢后,仍旧频繁泄漏。为彻底解决问题,从损坏管道的断口出发,对损坏的管道依次进行了宏观分析、化学成分检测和微观分析。根据分析所得数据得出:带HCl的再生气在低温管段结露而对316L材质的管道本体产生了应力腐蚀开裂,而在焊缝区域由于HCl的聚集而发生了α相的选择性腐蚀。因此不锈钢316L在此工况下并不适用,为了抵抗HCl的强腐蚀性,推荐使用采用碳钢加新型的复合陶瓷涂层的方法,通过调整复合陶瓷涂层的配方,使复合陶瓷管道在现场得到了成功地使用,有效地防止了HCl的腐蚀,延长了再生系统的运行周期。
中國石化上海高橋分公司煉油事業部煉油作業五區連續重整裝置再生氣放空管道由碳鋼改為316L不鏽鋼後,仍舊頻繁洩漏。為徹底解決問題,從損壞管道的斷口齣髮,對損壞的管道依次進行瞭宏觀分析、化學成分檢測和微觀分析。根據分析所得數據得齣:帶HCl的再生氣在低溫管段結露而對316L材質的管道本體產生瞭應力腐蝕開裂,而在銲縫區域由于HCl的聚集而髮生瞭α相的選擇性腐蝕。因此不鏽鋼316L在此工況下併不適用,為瞭牴抗HCl的彊腐蝕性,推薦使用採用碳鋼加新型的複閤陶瓷塗層的方法,通過調整複閤陶瓷塗層的配方,使複閤陶瓷管道在現場得到瞭成功地使用,有效地防止瞭HCl的腐蝕,延長瞭再生繫統的運行週期。
중국석화상해고교분공사련유사업부련유작업오구련속중정장치재생기방공관도유탄강개위316L불수강후,잉구빈번설루。위철저해결문제,종손배관도적단구출발,대손배적관도의차진행료굉관분석、화학성분검측화미관분석。근거분석소득수거득출:대HCl적재생기재저온관단결로이대316L재질적관도본체산생료응력부식개렬,이재한봉구역유우HCl적취집이발생료α상적선택성부식。인차불수강316L재차공황하병불괄용,위료저항HCl적강부식성,추천사용채용탄강가신형적복합도자도층적방법,통과조정복합도자도층적배방,사복합도자관도재현장득도료성공지사용,유효지방지료HCl적부식,연장료재생계통적운행주기。
After the carbon steel vent line of regenerated gas in CCR in SINOPEC Gaoqiao Petrochemical Company was replaced with 316L line, the frequent leaking continued to occur. To solve this problem, macro analysis, chemical composition analysis and micro analysis were performed on the cross section of failed pipelines. It is concluded from analysis result that: the regenerated gas containing HCl formed dews in the low- temperature section of pipelines, which led to stress corrosion cracking of 316L stainless steel pipelines, while α- phase selective corrosion developed in welded area due to the accumulation of HCl. Therefore, 316L stainless steel is not a proper material selection for this service. To resist HCl's strong corrosivity, it is recommended to use carbon steel coated with composite ceramic, and the ceramic formula can be adjusted. The ceramic -coated pipelines have been successfully applied in the commercial units, which has effectively prevented the corrosion of HCl and extended the operating cycle of regeneration system.