PARTICLE NUMBER EMISSIONS AND SIZE DISTRIBUTIONS FROM RESIDENTIAL WOOD STOVES UNDER LABORATORY CONDITIONS
Keywords:
Biomass combustion, wood stoves, batch combustion, particle number emissions, number size distributionsAbstract
The objectives of the study were to experimentally investigate particle number emissions and number size distributions from two modern residential wood stoves with capacity 10 kW and 20 kW under laboratory conditions using a state of the art instrument Electrical Low Pressure Impactor Plus (ELPI+). The ELPI+ measures particles in real time with a fast response time in a wide particle size range from 6 nm to 10 μm aerodynamic diameter. Five combustion batches for each wood stove were conducted for the particle emission measurements in a laboratory of a stove manufacturing plant in Namur, Belgium. Batch 5 for the 10kW stove was operated in part load heat output. The combustion experiments were conducted with minor modification of primary air supply into the combustion chamber. Experimental results show that particle number concentrations measured from both stoves varied between 3.4×107 to 8.7×107 particles/cm3 for the startup phase, 2.6×107 to 5.0×107 particles/cm3 for the combustion phase, 1.8×107 to 2.7×107 particles/cm3 for the burnout phase and 2.7×107 to 5.3×107 particles/cm3 for the total cycle. The startup phase of all the batches was characterized by relatively higher particle number emissions probably due to low temperature condition and dust carryover. Particle number size distribution results show that the majority of all the phases has bimodal size distributions with one mode has a peak particle number concentrations at the particle size around 20 nm while another mode has maximum concentrations at the particle size between 70 nm to 125 nm.
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