NANOPARTICLE AND NON METHANE HYDROCARBON EMISSIONS FROM A MODERN CLOSED FIREPLACE

摘要

For wood combustion in small appliances where incomplete combustion occurs, it is very important todistinguish between flue gas methane and non methane hydrocarbons to give a good evaluation of nanoparticleemissions. While non methane hydrocarbons are gaseous at stack temperature they may contribute to the formationand growth of nanoparticles in the atmosphere. For this purpose, a study is carried out to investigate the influence ofnon methane hydrocarbons in the formation of nanoparticles in the quenched and diluted flue gas generated by aclosed fireplace (11 kW) with natural air draft and fed with beech wood logs. The particle number concentration andsize distribution measurements were conducted in parallel with an electrical low pressure impactor (ELPI) and a fastmobility particle sizer (FMPS). Two analyzers with flame ionization detection have been used for gaseous organiccarbon measurements based respectively on chromatographic separation and on catalytic process. The differentcombustion phases of the closed fireplace (ignition, stable flame, extinction) are observed to significantly affect theformation of nanoparticles triggered by the presence of non methane hydrocarbons in the cooled flue gas.