Degassed Conductivity - Comments on an Interesting and Reasonable Plant Cycle Chemistry Monitoring Technique

摘要

This is the third part of a three-part publication focusing on the behavior of typical plant cycle contaminants during degassing in a typical degassed cation conductivity system.A rigorous thermodynamic approach was chosen for the evaluation of conditions in the degassing part of the system.As shown in Part 1,low-molecular acids are not removed during the degassing;carbon dioxide,however,is nearly completely removed (Part 2).In this part of the series,it is demonstrated that the relevant strong inorganic acids are not lost in the degassing device.Degassed cation conductivity monitoring is not as common as specific and cation conductivity monitoring even though this technique offers some very interesting features.As shown in the case studies discussed,this technique can help to distinguish between plant cycle contamination due to inorganic and/or organic acids and/or their salts and that caused by carbon dioxide.This may be important,e.g.,during startup of a unit.