Continuous emissions monitoring system with a humidified calibration system

摘要

A continuous emissions monitoring system (CEMS) that is in fluid communication with a flue stack 22 conducting exhaust gas from a combustion source comprises: an analyzer 20 for measuring concentrations of an analyte (e.g. mercury) present in the exhaust gas; a probe 40 that acquires a sample of exhaust gas from the flue stack; a calibration checking system 100 that includes a source 102 that provides a flow of calibration material (the calibration material being the same as the analyte); a humidifier 104 that humidifies the flow of calibration material; a supply system 260 that provides a supply of liquid 106 to the humidifier. The moisture from the humidifier may act to cleanse removed analyte from the probe 40 and thereby enable an accurate measurement. The system may be used to monitor mercury emissions from e.g. coal fired power plants.