The Gas Proffessionals Solutions for Energy The Gas Proffessionals Solutions for Energy Solutions for Energy "Green" biomass-derived power can be accomplish by retrofitting old coal fired boilers to fire primary biomass. Oxygen Enhanced Combustion (O.E.C.) O.E.C support the strategy to fire a mixtureof biomass materials by retrofitting old coal-fired boilers O.E.C. mitigates many of the problems associated with biomass firing, avoiding exceeding the ID fan capacity Gases we use At Nippon Gases we use gases to find solutions to your company's problems. In the energy industry, we use mainly oxygen to mitigate associated problems with the conversion to biomass firing.