火电厂反渗透进水ORP测量的影响因素

Influencing factors of ORP measurement for reverse osmosis influent water in thermal power plants

模拟火电厂反渗透进水,进行了氧化还原电位(ORP)的静态和动态试验,研究了温度、溶解氧和电极表面状态对ORP测量的影响。静态试验结果表明,当温度从15℃升至35℃时,ORP降低了12%;通高纯氮除氧,ORP可降至除氧前的37%。动态模拟冬夏两季电厂在线监测反渗透进水ORP,结果表明,温度为28℃时的ORP比温度为14℃时降低了17%。ORP电极的表面状态对ORP测量的准确性影响较大。根据分析结果,提出了提高火电厂在线监测反渗透进水ORP准确性的建议。

The static and dynamic state experiments of oxidation reduction potential（ORP） have been done through simulating reverse osmosis influent water in thermal power plants. The effects of temperature,dissolved oxygen and electrode surface state on ORP measurement is studied. The static experiment results prove that ORP is reduced by12% when temperature goes up from 15 ℃ to 35 ℃. ORP can drop by 37% of the result before deoxygenation,by high purity nitrogen deoxygenation. The on-line monitoring reverse osmosis influent water ORP of the power plant during winter and summer has been simulated dynamically. The results show that when the temperature is 28 ℃,ORP can be reduced by 17%,which is lower than that of the result when temperature was 14 ℃. The surface state of ORP electrode has a great effect on the accuracy of ORP measurement. Based on the analytical results,some suggestions have been proposed to improve the accuracy of the on-line monitoring reverse osmosis influent ORP in thermal power plants.