Reasonably designed and well-run biomass boilers burn fuel within the range of boiler specifications and should not produce any smoke, but if the fuel is too wet for the boiler, it may produce black smoke. All biomass boilers will produce some nitrogen oxides (NOx), especially nitrogen dioxide (NO2).

Although NOx emissions from gas boilers have been greatly reduced in recent years through the use of low NOx burners, which burn at temperatures slightly lower than those at which NOx is formed, the nature of biomass combustion and the need to ensure complete combustion of woody gas means that combustion occurs at temperatures where oxygen and nitrogen in the atmosphere can be chemically combined.

The better the quality of the combustion control system on the biomass boiler, the lower the NOx emission. In general, biomass boilers produce less NOx than oil-fired boilers. Biomass boilers do not produce any sulfur oxides (SOX).

ZOZEN Biomass Boilers are designed with special technology. Reasonable arrangement of the initial air and secondary air, in order to fully combustion and effectively reduce NOx emissions.