Much of the emissions from a recovery boiler are directly related to the efficiency of the combustion in the boiler. Many boilers run with high O2 and still have high CO emissions, simply because the air cannot find the fuel or does not have sufficient time to react. Other emissions such as TRS and NOx are related to combustion temperature.
The Clyde Bergemann Anthony-Ross Stacked Air System™ (patent pending) can simultaneously reduce emissions* from your recovery boiler and increase the thermal efficiency.
The Stacked Air System greatly improves the mixing and combustion over conventional air systems, resulting in more complete combustion with less excess O2 required. It also improves the three “T”s of combustion: time, temperature and turbulence. Longer gas residence times in the boiler, hotter combustion temperatures and better mixing turbulence results in almost complete burnout of the volatile gasses and very low excess oxygen requirements. With virtually complete combustion the boiler can be run to control combustion temperature to help control thermal NOx or TRS. Emissions reductions are typically available even at higher production rates.
An additional benefit of improving the combustion in the boiler is an increase in thermal efficiency with the reduction in excess O2. This reduces the stack heat loss, allowing that heat to go into steam production.
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