Power plant analytical instruments
Power Plant Emissions and SCR Monitoring
Stack Emissions Monitoring,
Continuous Emissions Monitoring (CEM),
Exhaust Gas Monitoring,
Formaldehyde Emissions Monitoring
Historically, combustion exhaust is analyzed for species such as CO, CO2, SO2, O2, THC (total hydrocarbons), NO, and NO2 using multiple single gas analyzers. These individual analyzers have a high initial cost, continuing maintenance cost and cannot measure wet sample streams, so sample condition systems must be installed to remove moisture. The conditioning process can affect the measurement quality and remove compounds of interest. In addition, current combustion analyzers cannot monitor all combustion byproducts suggested or required by changes in environmental regulations, including formaldehyde, which has traditionally been difficult to monitor in real time.
Tightening regulations on NOX emissions from stationary combustion sources has brought about the development of Selective Catalytic Reduction (SCR) technologies. These technologies are driving NOX emissions to low single digit ppm levels or below. This reduction is not without some drawbacks to emissions in that ammonia is commonly used by the SCR. Normally, ammonia levels can vary from tens of ppm to tens of ppb, but if not balanced correctly the process results in significant ammonia slip. One current method to monitor ammonia relies on catalytic conversion of NH3 to NO, which is then analyzed using traditional chemiluminescent NOX analyzers. This indirect measurement of ammonia adds a significant level of complexity and uncertainty, and current analyzers have limited accuracy below a ppm. New technology needs to be provided that will provide 100 ppb NH3 monitoring directly and in real-time.
FTIR-based analyzer capable of Continuous Emissions Monitoring (CEM) by directly measuring ppm to ppb levels of CO, NO, NO2, CH2O (formaldehyde), NH3, SO2, N2O, CH4 and other hydrocarbons, in sample streams containing up to 30% H2O and CO2. This enables complete exhaust gas measurement on wet streams with minimal sample conditioning. The 2030 provides continuous emissions monitoring with real-time analysis and display of more than 30 gases that include ppm to sub-ppm levels of both formaldehyde and ammonia. For example, the MultiGas 2030 can detect 100 ppb ammonia from Selective Catalytic Reduction (SCR) scrubbers, even in gas streams with high percentage levels of H2O and CO2. The ability to simultaneously detect most combustion byproducts, allows for the replacement of several single gas analyzers racks into a single compact instrument. Also, the permanently stored spectral calibration data, for each gas species, reduces the need for continuous calibration checks and the quantity of gas cylinders.