Air Monitoring


Low NOx Solution for Power Stations and


Other Large Combustion Plants


Successful emissions monitoring from gas turbine power generators requires appropriate consideration of their unique characteristics and how they differ from other large combustion processes. When selecting CEMS equipment for gas turbines, it is important to choose a system designed specifically for this application.


(ELVs) for NOx (expressed as NO2 equates to just 30ppm of NO2


In particular, the emission limit values are typically around 60mg/m3 equivalent), which . Following


EA guidance, which specifies that the maximum operating range should be 2.5 times the ELV, a 60mg/m3


maximum range of 75ppm NOx


ELV would allow a , considerably


below that available on many gas analysers. MCERTS Approval for Signal Portable FID Range


MCERTS approval for the Model 3000HM has now been extended to cover the portable models 3010 MINIFID and 3030PM FID hydrocarbon analysers in the Signal range. Anyone who has been required to measure Total Hydrocarbon emissions in the UK over the past 10 years will be aware of the Signal 3030PM portable FID. Since it was launched in 1993, the 3030PM has become the standard for VOC stack emissions testing. With all the same technology and features as the Model 3000HM, the 3030PM represents the top of the range for portable FID analysers.


In addition to these, Signal also offer a cost effective entry level portable VOC analyser, the Model 3010 MINIFID. With a simplified


user interface, the 3010 is a rugged, simple, easy to use solution to testing in awkward or hard to reach areas. John Clements, Managing Director says, “The 3000 series of hydrocarbon analysers have always been regarded as the top end of the market. Now that extensive tests carried out by the UK NPL and AEA laboratories have authenticated this status, we can concentrate on future developments of this product to further enhance its usability.”


The full range of MCERTS approved FIDs is also available for hire from our rental division. Reader Reply Card no 113


35


In addition, the NO2


fraction of the NOx


is


much higher when compared to other large comb-ustion processes. This is as a result of the high air dilution in gas turbines, which allows oxidation of NO to NO2


prior to flue


and water vapour, it is important not to allow condensing water vapour in the sample to cause loss of NO2


due to its solubility. Among the various techniques for meas-


, chemil-uminescence is preferred for low levels and it is also the standard reference method (SRM). The Signal Emirak is a heated, extractive system, which utilises a chem-iluminescent NOx sensitivity to NOx


uring NOx analyser with well within the 75ppm


range noted above and it is now being tested for MCERTS approval in the UK. This approval is expected such that the system fully complies with EN14181 within the implementation timescale set out by the Environment Agency.


The Signal Ambitech “Emirak” CEM has been successfully employed in gas turbine power generator applications throughout the world for the past 20 years. Currently over 3000MW of electricity is being generated in the UK by plants using this equipment including a recent installation in Baglan Bay, South Wales, for the advanced 9H gas turbine manufactured by General Electric.


For further information on the Emirak or any of Signal’s products and services please call 01276 682841 or visit www.signal-group.com.


Reader Reply Card no 112 Reader Reply Card no 114


exit. There can also be a high level of water vapour, due to the levels of hydrogen in natural gas. With higher levels of NO2


Annual Buyers Guide 2009


IET


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