August 2018

Process Control and Instrumentation

Online monitoring of H2O using tunable diode laser absorption spectroscopy

Raw wellhead natural gas is a complex mixture of methane (CH4), hydrocarbon condensates, natural gas liquids (NGL), water, contaminants, hydrogen sulfide (H2S), carbon dioxide (CO2), nitrogen, mercury and other compounds.

Engelhart, W. G., SpectraSensors; Spencer, B., Enterprise Products Co.; Beitel, D., Davis & Davis Co.

Raw wellhead natural gas is a complex mixture of methane (CH4), hydrocarbon condensates, natural gas liquids (NGL), water, contaminants, hydrogen sulfide (H2S), carbon dioxide (CO2), nitrogen, mercury and other compounds. Natural gas processing involves separating CH4 from NGL and removing entrained contaminants. The design and complexity of natural gas processing plants varies based on the end products being recovered and on the entrained contaminants being removed. Plants designed to recover C2+ NGL utilize cryogenic processing.1 The operation and control of molecular sieve dehydration dryer vessels have a direct impact on cryogenic processing equipment in NGL recovery plants. Molecular

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