You know that your boiler is a major energy user, and you may have concerns about its efficiency. But if boilers are the right size and type for their operations, some owners are reluctant to replace them. The efficiency problem may not be the boiler itself, but the burner. Owners are discovering that they can make major improvements in operating efficiency by installing a replacement burner, with improved turndown, higher combustion efficiency, lower emissions, and precise control capability.
Role of the BurnerOlder serviceable boilers can be equipped with advanced burners to improve boiler turndown, reduce excess air and reduce emissions. Often efficiency gains of 5% to 30% are achievable. Photo courtesy Riello Burners.
A report from the DOE’s Energy Efficiency and Renewable Energy Division (EERE) indicates, “The purpose of the burner is to mix molecules of fuel with molecules of air. A boiler will run only as well as the burner performs. A poorly designed boiler with an efficient burner may perform better than a well-designed boiler with a poor burner. Burners are designed to maximize combustion efficiency while minimizing the release of emissions.”
The report goes on to point out the importance of minimizing excess air in the combustion process, and the value of high turndown ratios in minimizing startup-shutdown energy losses. It also advises that in many cases, burners that were designed for oil-burning and were converted to natural gas are quite inefficient a...