Micro Modulating Burner By swapping to one of the latest generation of micromodulating burners you can improve operational efficiency of a Firetube boiler by 5 %.
Traditional burners are often imprecise and not well matched with the boiler . The new style micro-modulating burners , such as our Optimo range , achieve very accurate control of low excess air levels throughout the turndown range resulting in an excellent combustion efficiency no matter what the process load .
Furthermore , the latest burners have been designed with a very high turndown ratio , enabling the burner to adjust its output to meet the needs of the process . This avoids the costly energy losses incurred by continual stop / start cycles .
O2 / CO Trim Variable environment conditions , such as air temperature and humidity , as well as fuel quality fluctuations , 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 5-8 %.
Efficiency can be increased by 0.9 % 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 combustion 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 , 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 offers a complete range of products and services for boiler houses and other process heating needs .
www . babcock-wanson . com | info @ babcock-wanson . com | Tel 020 89537111
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