WORKPLACE SAFETY


O2/CO TRIM


Variable environment conditions, such as air tem- perature and humidity, as well as fuel quality fluc- tuations, have negative effects on the combustion process, efficiency and emissions. Not enough or too much air leads to the risk of CO production. Too much air also reduces efficiency. To protect against climatic variations, burner settings are usually done with air excess at five to eight per cent. Efficiency can be increased by 0.9 per cent by


incorporating O2 control and CO measurement equipment. A combined probe measures the


residual O2 and the CO level in the flue gas and communicates the information to the O2 and CO transmitter which sends a correction 4-20 mA


signal to the BMS in order to adjust the combus- tion air damper position, or combustion air fan inverter speed. This makes for optimal excess air, ensuring complete combustion.


CONCLUSION


Firetube boilers have been around for nearly two centuries and, as you would expect, have changed


considerably since those early days. From the energy crises of the 1970s onwards, the focus of R&D has been on improving efficiency, but only in recent years have we seen a truly concerted effort to reduce energy consumption and emissions. By


their very nature, firetube boilers will remain one of the major energy consumers in any plant, but we can – and must! - take steps to reduce that energy.


Babcock Wanson www.babcock-wanson.com INDUSTRIAL COMPLIANCE |WINTER 2024 23


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