在线监测氨氮浓度的电导测量方法研究

建立了适用于氨氮在线监测的干法蒸馏-电导法和湿法蒸馏-电导法。该方法是通入一定流量的气量于含氨试样中,全沸腾加热,蒸发出的氨和水蒸气一起经冷凝器后,进入酸吸收液中。酸吸收液的电导率随氨氮蒸馏液的吸收发生变化,其变化的值和样品中氨氮的浓度呈一定的比例关系。研制出的氨氮在线监测仪结构简单,运行稳定可靠,测量结果准确。

Study on the Conductivity Measurement Method for Ammonia On line Monitoring

This article introduces the dry distillation-conductance method and the wet distillation-conductance method which could be used in the design of on-line ammonia nitrogen analyzer.This method is passing flow of gas into ammonia containing sample and full boiling;let the ammonia and water vapor evaporated through the condenser to enter the acidic absorption solution.The conduc-tivity of the absorption solution will change by the absorption of ammonia distillation fluid.The changing value is in proportion with the concentration of ammonia in the sample.The on-line ammonia nitrogen analyzer which designed by this method is simply struc-tured,in stable and reliable operationand could give the accurate measurement result.