Air Monitoring FTIR Best Option for Multi-Gas Emissions
Globally, the number of industrial processes and emissions being monitored with Gasmet’s FTIR multi-gas technology has increased enormously in recent years as process managers exploit the benefits of being able to monitor a wide range of gases simultaneously and with minimal maintenance and calibration requirements.
Gasmet CEMS (continuous emissions monitoring systems) are used for continuous emissions monitoring in incinerators, biomass boilers, and cement plants, and for process monitoring in many different applications. A Gasmet FTIR becomes cost-effective when there is a need to monitor 4 or more gases or vapours. Typically, the analyser is set to measure up to 50 parameters
simultaneously for compliance purposes and for process control with the most common configurations including H2O, CO2, CO, SO2, NO, NO2, N2O, HCl, HF, NH3, O2 and TOC. However, Gasmet’s Antti Heikkila says “A major advantage of our FTIR technology is that we are able to add further parameters quickly and simply without a requirement for new hardware if there is a change in the process or the regulations - which means the analyser is ‘future proof’.”
Each system is supplied with an industrial PC for processing and storing sample spectra with Calcmet software, which controls the CEM system, analyses the spectrum using sophisticated analysis algorithms, and offers a variety of fieldbus output protocols for interfacing with plant automation systems. For example, cross-interference between gases is automatically taken into account in the analysis settings for each compound. A further advantage of the stored spectra is the retrospective analysis opportunity that they offer. This means that if users wish to study a new parameter they are able to look back at old spectra and derive concentration values.
A further advantage of Gasmet FTIR is the low maintenance requirement. Zero calibration with Nitrogen (background) just takes a few minutes and is required once a day. Water vapour calibration is performed after every major maintenance operation and at least once per year. Under normal circumstances no other calibration is required which saves a great deal of time, effort and money.
The Gasmet CEMS has been certified by TÜV (Germany) and MCERTS (UK), and fulfils the requirements of QAL 1 according to EN 14181 and EN ISO 14956.
Reader Reply Card No. 173
Continuous Mercury Monitor is Sensitive and Simple to Run
As regulatory pressure to monitor mercury emissions increases, Gasmet has developed a new type of continuous monitoring system that offers process operators the chance to demonstrate compliance whilst finding new ways to improve their processes. Employing cold vapour atomic fluorescence (CVAF), the fully automatic Gasmet Continuous Mercury
Monitor (CMM) has been
designed to be simple to operate with a low maintenance requirement. However, the major advantages of the CMM are the very low detection limits that it offers in combination with the highest levels of reliability.
The CVAF spectrometer has an integrated high temperature converter to effectively transform mercury compounds to atomic mercury without any chemicals or vulnerable catalyst materials. Sample gas dilution with synthetic nitrogen generated within the CMM system is an effective tool to promote sample transportation whilst decreasing the loss of Hg0 fluorescence signal to interactions
with O2, CO2, and H2O. The fluorescence cell is specially designed to eliminate stray reflections and background light so that even with sample dilution the CMM system is capable of monitoring low levels of mercury as required in the forthcoming US Clean Air Mercury Rule.
The system is controlled through a touch screen control panel, which is integrated with the analyser and calibrator inside an air-conditioned cabinet and calibration is maintained with regular automatic zero and span calibrations using Hg0 and HgCl2 calibration gases generated within the CMM system - typically every 24 hours. Periodic linearity checks with atomic mercury or mercury chloride are also possible.
Initial users of the Gasmet CMM have reported excellent reliability with low maintenance requirements and since no separate chemicals, gold amalgamation concentrators, air scrubbers or additional gases are required, operational costs have been minimal.
Reader Reply Card No. 174 Reader Reply Card No. 175
www.envirotech-online.com IET May / June 2012
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