有机磷在循环冷却系统内的迁移转化研究

发布时间：2018-05-05 03:39

  本文选题：中水 + 有机磷　； 参考：《华北电力大学》2017年硕士论文

【摘要】：中水回用到电厂循环冷却系统是缓解全球淡水资源短缺的重要措施之一,中水具有水量大、水质稳等优点,但其复杂的水质条件是引起系统发生结垢、腐蚀和微生物滋生问题的重要原因。有机磷是引起上述问题的重要因素之一,其形态和含量对系统的结垢和腐蚀影响尚无统一定论。本文以模拟再生水作为补给水回用到循环冷却系统中,有机磷阻垢缓蚀剂作为系统内磷的唯一来源,考察了颗粒态有机磷提取方法的优化和不同工况下有机磷形态、含量的变化及其对系统水质、结垢和腐蚀的影响。研究结果表明:颗粒态有机磷采用活性有机磷提取法和中等活性有机磷(酸)法连续提取时回收率最高。系统温度、浓缩倍率(COC)和药剂投加量对溶解态有机磷的转化产生重要影响,当温度、浓缩倍率和药剂投加量单一升高时,溶解态有机磷的转化率相应增大,当80℃时转化率为83.88%,而COC5和12 mg/L时分别为77.24%和75.72%,溶解态有机磷的有效利用率降低,温度和浓缩倍率条件下系统结垢量和腐蚀率增大;系统硬度(H)对溶解态有机磷的迁移具有重要影响,随着硬度的升高,溶解态有机磷向颗粒态有机磷的迁移率增大,H6时迁移率达到66.54%,同时,系统结垢量和腐蚀率也增大,溶解态有机磷的利用率低;系统流速对溶解态有机磷的迁移转化影响较小,流速升高时系统结垢量和腐蚀率增大。因此,系统温度为40℃、流速0.6 m/s、浓缩倍率4、硬度4和8 mg/L药剂投加量时为最佳运行条件。该研究成果为电厂实际运行和其它研究提供实验依据和理论参考,其推广将具有重要的经济效益和社会价值。
[Abstract]:The reuse of reclaimed water to the circulating cooling system of power plant is one of the important measures to alleviate the shortage of fresh water resources in the world. The reclaimed water has the advantages of large quantity of water and stable water quality, but its complex water quality conditions cause the scaling of the system. An important cause of corrosion and microbial breeding. Organophosphorus is one of the important factors that cause the above problems. The influence of organophosphorus form and content on scaling and corrosion of the system is not uniform. In this paper, simulated reclaimed water was used as recharge water to recycle cooling system, and organic phosphorus scale and corrosion inhibitor was used as the sole source of phosphorus in the system. The optimization of the extraction method of particulate organic phosphorus and the organic phosphorus forms under different operating conditions were investigated. The change of content and its influence on water quality, scaling and corrosion of the system. The results showed that the recovery rate of particulate organophosphorus was the highest when it was extracted by active organophosphorus extraction method and medium active organic phosphorus (acid) method. The system temperature, concentration ratio (COC) and dosage have important influence on the transformation of dissolved organophosphorus. The conversion rate of dissolved organic phosphorus increases with the increase of temperature, concentration ratio and dosage. At 80 鈩，

本文编号：1846054