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Fossil Fuel Power Station

The majority of power plants run on fossil fuels (natural gas, oil and coal), which are known to be a major contributor of carbon dioxide (CO2) and nitrogen oxides (NOx) emissions. Any power generation facility would benefit from investing in highly accurate continuous gas emissions monitoring equipment to ensure their compliance with emissions standards.


NOx emissions are minimized through the use of a reducing agent. This chemical process, referred to as the DeNOx system, makes use of SCR and SNCR technologies that deploy ammonia (NH3) as a reducing agent. Unisearch LasIR analyzers can precisely measure ammonia at the required location, thus helping to optimize the correct dosing of ammonia and prevent ammonia slip. Ammonia slip represents the residual amount of ammonia that needs to be minimized to reduce operating costs as well as  prevent ABS formation and contamination of fly ash.


In order to guarantee process optimization, it is vital that NH3 slip be measured right after the DeNOx system process, and that the measurement is representative of the true residual concentration of ammonia. An accurate concentration value can only be guaranteed by measuring across the duct, thus compensating for possible stratifications of the gas. Depending on the process, there can be various conditions at the location, such as high temperatures, large ducts and very high dust loading, that could prevent an in-situ cross duct measurement. Thanks to the use of dedicated high-power NH3 lasers and fiber coupling, our LasIR monitoring system succeeds where the others fail. In most cases, in-situ cross stack is possible even in extreme conditions. Additionally, fiber-coupling allows for the use of a single LasIR multi-channel analyzer connected to two or more in-situ cross-duct optics that can be installed at different duct sections of the same boiler or at different heights of the same large duct to provide an accurate representation of the ammonia distribution.


In certain cases where the type of coal used or the operation conditions produce very high levels of dust, we can provide a patented Pseudo In-situ Measurment System (PIMS), designed specifically to provide high sensitivity under very high dust loadings. This system can also be used when niether side of the duct is accessible.

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