CONTROLLED HUMIDIFICATION CALIBRATION CHECKING OF CONTINUOUSEMISSIONS MONITORING SYSTEM

摘要

A continuous emissions monitoring system is in fluid communication with a fl ue stack (2) conducting exhaust gas from a combustion source. The continuous emissions monitor system comprises an analyzer (20) for measuring concentrations of an analyte present in the exhaust gas. A probe (40) is in fluid communicatio n with the flue stack (22) to acquire a sample of exhaust gas from the flue stack. The probe (40) is also in fluid communication with and located upstream of the analyzer (20 ). The probe (40) tends to remove analyte from the sample. A calibration checking system (100) is in fluid communication with the probe (40). The calibration checkin g system (100) includes a source (106) that provides a flow of a known concentration of calibration material to be measured by the analyzer (20). The calibration material is the same as the analyte. A humidifier (104) is associated with the source to provide moisture to a flow of calibration material. The moisture acts to cleanse removed analyte from the probe (40) and thereby enable an accurate measurement of th e concentration of the calibration material. A supply system (160, 260) is operatively connected with the humidifier (104) to provide a desired amount of a liquid to the humidifier.