无磷水处理剂应用炼油污水回用系统动态模拟实验

Dynamic Simulation Experiment of the Application of non-Phosphorus Water Treatment Agent in Oil Refining Wastewater Recycling System

采用NJHL-C型智能冷却水动态模拟装置对某炼油回用水进行动态实验,研究了循环水中各介质在浓缩过程中的变化规律、无磷水处理剂的缓蚀阻垢效果、高浓缩倍数运行状况下的腐蚀结垢倾向。结果表明,Cl^-、SO_4^(2-)含量、硬度及电导率均随浓缩倍数的提高而增大,但相互之间的增长速率略有差异。硬度在实验后期的增长速率有所减小,该系统在高浓缩倍数下运行时存在一定的结垢倾向;由于回用水质的特殊性,碱度及pH随浓缩倍数的增大而减小;在运行期间最高浓缩倍数可达到6.5,且循环水的污垢热绝缘系数、瞬时腐蚀率、沉积率均能符合GB 50050—2007规定。综合考虑节水减排效益及水质控制指标,运行浓缩倍数控制在5左右较适宜。

NJHL-C type intelligent dynamic simulator was used to simulate the process of cooling water circulation in oil refinery by real-time monitoring, variation rule of each medium in circulation water during the concentration process and the effect of scaling and corrosion inhibitor using non-phosphorous water treatment agent had been studied. The tendency of corrosion and scaling was also investigated under the condition of highly concentrated circulating water. The research indicated that the concentration of Cl^-, SO_4^(2-),the hardness and the conductivity were gradually increased with the increase of concentration multiple. But the growth rate were various between each other. The growth rate of hardness decreased in the later period of experiment, and the system had tendency of scale formation in the high concentration ratio; the alkalinity and p H decreased with the increased of concentration ratio due to the particularity of reuse water quality; The highest concentration ratio could reach to 6.5 during the operation. And the fouling thermal resistance, instantaneous corrosion rate and the rate of deposition of recycled water were all conform to the requirement of national standard GB 50050—2007. Taking comprehensive consideration of water-saving efficiency and water quality control index, the operation concentration ratio controlled by 5 approximately is much better.