ADVANCES IN ON-LINE HYDROGEN MEASUREMENT

摘要

Hydrogen is one of the most widely used reaction gases in the hydrocarbon processing industry.rnOn-line compositional measurement is used to determine and control hydrogen concentrations inrnvarious process streams. An often applied gas measurement technology is continuous thermalrnconductivity which depends on the large thermal conductivity difference between Hydrogen andrnmost other gases present. This measurement technology typically provides adequate precisionrnunder stable process conditions when impurities present are at low and stable concentrations.rnHowever, increased and changing concentrations of impurities can have an adverse impact on thernhydrogen measurement precision and consequently have an impact on process control. This isrnespecially evident during process changes. By utilizing an alternative analyzer technology tornspeciate and quantify hydrogen, high precision can be achieved under any process conditionsrnwithout complicating the measurement configuration.rnThis paper discusses measurement requirements, variables impacting quantification at variousrnprocess conditions as well as comparing alternative system configuration and economicalrnaspects.