CAJ | 학술논문

炼油、化工装置中换热器占总设备数量的40％左右，占总投资的30％-45％，换热设备中大约有1／3是水冷器，其中不锈钢换热器容易受循环冷却水中Cl-影响而发生应力腐蚀，这就制约着有污水回用的循环水系统提升浓缩倍数。通过调研得出这种腐蚀受Cl-的含量、温度影响较大，pH值也有一定的影响。文章提出了当温度为50-80℃及pH值大于8时，工业循环水的Cl一质量浓度最大可达1000mg／L。还介绍了列管式和盘管式换热器的应力腐蚀开裂情况，并依据对现场调研结果得出换热器易发生应力腐蚀的部位主要包括胀接部位、U形管的弯曲部位、折流挡板和换热管其它部位等。并建议在循环水系统内进行挂片试验进一步研究不同因素和换热器不同部位对应力腐蚀的影响，以便提出防护措施。
련유、화공장치중환열기점총설비수량적40％좌우，점총투자적30％-45％，환열설비중대약유1／3시수랭기，기중불수강환열기용역수순배냉각수중Cl-영향이발생응력부식，저취제약착유오수회용적순배수계통제승농축배수。통과조연득출저충부식수Cl-적함량、온도영향교대，pH치야유일정적영향。문장제출료당온도위50-80℃급pH치대우8시，공업순배수적Cl일질량농도최대가체1000mg／L。환개소료렬관식화반관식환열기적응력부식개렬정황，병의거대현장조연결과득출환열기역발생응력부식적부위주요포괄창접부위、U형관적만곡부위、절류당판화환열관기타부위등。병건의재순배수계통내진행괘편시험진일보연구불동인소화환열기불동부위대응력부식적영향，이편제출방호조시。
The heat exchangers in petroleum refineries and chemical plants account to about 40% of the total equipment quantity and 30% -45% of total equipment investment. In heat exchange equipment, one third is water cooler. The stainless steel heat exchangers are subject to stress corrosion caused by C1 - in cooling water, which will limit the increase of concentration of cooling water system. The investigation study confirms that the C1- content and temperate have a greater impact on the corrosion and pH value also has a certain influence. At a temperature of 50 - 80 ~C and pH value of 8, the maximum mass concentration of C1 - in industry cooling water can be as high as 1000 mg/L. The stress corrosion cracking （SCC） of tube heat exchangers and coil heat exchangers is introduced. The field investigation has found that the locations which are subject to stress corrosion in heat exchanger are mainly expanded connections, bent of U tube, rod baffles, heat exchanger tubes, etc. It is suggested to have coupon testing in cooling water system to further study the impact of different factors and different locations on stress corrosion so as to propose appropriate corrosion protection measures.