Objective In order to ensure that the gas quality of the natural gas purification device to meet the standard, Jiange Natural Gas Purification Plant for the first time used the near-infrared(NIR) spectroscopy online analysis technology to realize the rapid and accurate determination of desulfurization solution components, which is convenient for the timely adjustment of desulfurization system process parameters.

Method By optimizing "modeling data" and "modeling algorithm" repeatedly, an optimized NIR spectroscopy analysis model of desulfurization solution components was established.

Results By comparing several sets of online analysis data with laboratory analysis data, it was found that the deviation of analysis results was within 2%, indicating that NIR spectroscopy can accurately monitor the content of MDEA and water in desulfurization solution.

Conclusions The successful application of NIR on-line analysis technology can provide a timely and accurate data support for continuous water replenishing of desulfurization system, and ensure the stable operation of desulfurization system of natural gas purification unit, which has extremely important significance for popularization and application.