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| - Effects of Sampling Conditions on the Size Distributionof Fine Particulate Matter Emitted from a Pilot-ScalePulverized-Coal Combustor
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| - A dilution sampler has been designed and manufactured to simulate the effects of dilutionprocesses on particulate matter emissions from coal-fired power plants and other combustionsystems. The sampler allows independent control of the dilution ratio and residence time.Experiments were performed to examine the effects of these parameters on the particulateemissions of a pilot-scale pulverized coal combustor burning a low sulfur bituminous coal.Measurements included the particle size distribution in the range from 0.003 to 20 μm and thePM2.5 mass emission rate. The residence time and dilution ratio do not influence the particlemass emission rate, but have a significant effect on the size distribution and the total number ofparticles emitted. Increasing the residence time dramatically decreases the total particle numberconcentration, and shifts the particle mass to larger sizes. Increasing the dilution ratio increasesthe concentration of ultrafine particles. The effects of residence time can be explainedquantitatively by the coagulation of the emitted particles; however, the effects of dilution ratioare more complex because the dilution ratio influences both the coagulation rate and gas-to-particle conversion.
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