Editor’s choice


the role of gas analysis in clean air strategies to reduce carbon emissions


Cleaning up your aCt I


nternational action on the climate, such as the 2016 Paris Agreement, has increased awareness of the effect of greenhouse


gases, driving industrial plant operators to reduce emissions and find more ecologically responsible ways of operating. Reducing carbon emissions to the atmosphere


has become an area of growing importance for operators. Sensitivity towards the issue has been raised by the introduction of increasingly stringent environmental regulations. Gas analysis delivers an effective solution for


these efforts, supporting measurement of harmful emissions, and by improving efficiency to ensure fewer emissions are generated in the first place. In this article, Servomex looks at three


main process areas that support a clean air strategy: combustion efficiency, gas clean-up (including carbon capture processes), and emissions monitoring.


Combustion Control solutions


Combustion reactions mix fuel with oxygen in a fired heater to generate heat energy for a process. They typically need a significant amount of fuel, create potential safety hazards, and generate harmful emissions including


carbon dioxide (CO2). Running fired heaters with high


excess air – as happened before gas analyser technology – avoids creating unsafe conditions that could lead to an explosion, but is highly inefficient, increasing fuel consumption. Excess


oxygen (O2) also combines


with nitrogen and sulfur in the fuel to produce unwanted


emissions such as oxides of nitrogen


(NOx) and sulfur (SOx). Accurate measurement of O2 and


combustibles such as carbon monoxide (CO) helps to optimise the ratio between the air and fuel creates a more efficient reaction. Controlling combustion in this way benefits


plants looking to meet environmental standards requirements. Fuel consumption is reduced, resulting in fewer emissions, a reduction in NOx,


SOx and CO, and a decrease in CO2. Zirconia-based sensing technology is long


established as a solution for O2 monitoring in combustion, with reliable, accurate results and a


fast response to changing conditions. Tunable Diode Laser (TDL) technology provides an even faster measurement, particularly for CO, and


10 October 2021 Instrumentation Monthly


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