净化厂回用水对循环水影响及控制措施研究  

Impacts of reusing treated blowdown water on circulating water and corresponding control measures

作　　者：黄刚华 郑凯[1] 黄丽华 

机构地区：[1]中国石油西南油气田公司天然气研究院 [2]国家能源高含硫气藏开采研发中心 [3]中国石油天然气集团公司高含硫气藏开采先导试验基地

出　　处：《石油与天然气化工》2018年第1期100-104,共5页Chemical engineering of oil & gas

基　　金：国家科技重大项目"四川盆地大型碳酸盐岩气田开发示范工程"(2016ZX05052)

摘　　要：为了提高水资源利用率,川渝某净化厂将电渗析水、蒸发结晶水投加至循环水系统,但现场腐蚀挂片显示腐蚀速率为0.15mm/a,超过GB 50050-2007要求。水质分析表明,电渗析水和蒸发结晶水中的Ca^(2+)、Mg^(2+)含量较低,如补充水量较大,会导致浓缩倍数较低,增加水质的稳定指数,提高水体的腐蚀性。室内考察了净化厂回用水对循环冷却水系统的影响,并以有机磷酸盐复配了相适应的水处理药剂b,在ρ(Ca^(2+))+碱度为200~600mg/L的水质范围内,缓蚀率和阻垢率均高达90%,保障了净化厂稳定运行。In order to improve the water utilization efficiency,a natural gas purification plant used the treated water from electrodialysis(ED)and multiple-effect evaporation(MEV)processes as makeup water in the recirculating system.However,the field coupon tests showed the corrosion rate reached 0.15 mm/a,beyond the requirements set by GB 50050-2007.The water quality analysis indicated that Ca^(2+) and Mg^(2+) concentration in the treated water from ED and MEV was comparatively low.When the volume of make-up water was significant,it would lead to low Cycles of Concentration(CoC),increase of water stability index and corrosivity.Bench-scale tests investigated the impacts of reusing treated blowdown water on circulating cooling water and subsequently,organophosphate complex was prepared to formulate the water treatment chemical b to inhibit the corrosion.The tests showed that when the sum of Ca^(2+) concentration and the total alkalinity was in the range of 200-600 mg/L,both corrosion inhibition rate and scale inhibition rate could be higher than 90%,which guaranteed the steady operation of the natural gas purification plant.

关 键 词：循环冷却水 低硬度 阻垢 腐蚀 

分 类 号：TE685[石油与天然气工程—油气加工工程]