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将污水进行适当处理回用于循环水系统,是石化企业降低水耗,减少污水外排的有效办法。锦西石化将中水回用到循环水系统后,焦化装置和重催装置多次发生水冷器腐蚀泄漏,影响装置的安全稳定运行。通过对中水回用现场循环水、回用水水质监测分析,以及水冷器检修调查显示:与新鲜水作为补充水的系统相比,中水回用水作为补充水,微生物种类多,系统更富营养化,更适宜微生物的生长繁殖。锦西石化装置水冷器水侧腐蚀的主要原因,是循环水系统异养菌长期超标,以及黏泥滋生引起的垢下腐蚀及微生物腐蚀。同时,水冷器工艺介质泄漏,进而影响循环水水质,使微生物控制及腐蚀控制出现困难。对此,需要加强循环水系统的杀菌措施,在保证循环水处理效果的同时,必须避免水冷器泄漏与水质腐蚀形成的恶性循环。
It is an effective way for petrochemical enterprises to reduce water consumption and reduce efflux of sewage by properly treating the sewage back to the circulating water system. After Jinxi Petrochemical reused the reclaimed water to the recirculating water system, the corrosion and leakage of the water coolers occurred several times in the coking unit and the reclaiming unit, affecting the safe and stable operation of the unit. Through the on-site reuse of reclaimed water, reclaimed water quality monitoring and analysis, and water cooler repair survey showed that: compared with fresh water as a supplementary water system, reclaimed water as a supplementary water, microbial species, the system more nutritious The more suitable for the growth and reproduction of microorganisms. The main reason for water side corrosion of water cooler in Jinxi petrochemical plant is that the heterotrophic bacteria in the circulating water system exceed the standard for a long time, and the scale corrosion and microbial corrosion caused by the slime breeding. At the same time, the water cooler process medium leakage, thereby affecting the quality of recycled water, so that microbial control and corrosion control difficulties. In this regard, the need to strengthen the disinfection of circulating water system measures to ensure the effectiveness of recycled water at the same time, we must avoid the leakage of water coolers and the formation of a vicious cycle of water quality.