Chang M B, Huang C K, Wu H T, Lin J J, Chang S H
Graduate Institute of Environmental Engineering, National Central University, 320, Chungli, Taiwan.
J Hazard Mater. 2000 Dec 15;79(3):229-39. doi: 10.1016/s0304-3894(00)00277-6.
Information on the concentration and size distribution of particles in the flue gas streams is essential for selecting and designing particle removal systems. Two municipal solid waste incinerators (MWIs) were selected for conducting flue gas sampling to determine the particulate distribution and heavy metals concentration on particles with different sizes by US EPA Method 5 sampling train and a cascade impactor. In addition, the characteristics of heavy metals contained on particles were investigated via isokinetic sampling of flue gas stream of air pollution control devices (APCDs). The experimental results indicated that average particulate matter (PM) concentrations at APCDs inlet were 2288.2+/-825.9 and 3069.2+/-810. 0mg/Nm(3), while the concentrations of PM at stack were 1.51+/-0.20 and 14.81+/-4.52mg/Nm(3) in MWI-A and MWI-B, respectively. The differential mass size distribution of PM and differential elemental size distribution of Zn, Pb, and Cu in front of APCDs were of bimodal forms. Results indicate that Zn>Pb>Cu in order of mass concentration in each stage. The fine particles represent approximately 70% and the coarse particles account for the rest 30% of total particulate matters collected on eight stages for both incinerators. Zn, Pb and Cu on fine particles account for approximately 80% and those on the coarse particles are less than 20% of the total heavy metals collected on eight stages of the cascade impactor for both incinerators.
了解烟道气流中颗粒的浓度和尺寸分布对于选择和设计颗粒去除系统至关重要。选择了两座城市固体废物焚烧炉（MWIs）进行烟道气采样，以通过美国环境保护局（US EPA）方法5采样系统和串联冲击器确定不同尺寸颗粒上的颗粒物分布和重金属浓度。此外，通过对空气污染控制装置（APCDs）烟道气流进行等速采样，研究了颗粒上所含重金属的特性。实验结果表明，在MWI-A和MWI-B中，APCDs入口处的平均颗粒物（PM）浓度分别为2288.2±825.9和3069.2±810.0mg/Nm³，而烟囱处的PM浓度分别为1.51±0.20和14.81±4.52mg/Nm³。APCDs之前PM的质量尺寸分布差异和Zn、Pb、Cu的元素尺寸分布差异呈双峰形式。结果表明，在每个阶段，按质量浓度排序为Zn>Pb>Cu。对于两座焚烧炉，在八个阶段收集的总颗粒物中，细颗粒约占70%，粗颗粒占其余30%。两座焚烧炉在串联冲击器的八个阶段收集的总重金属中，细颗粒上的Zn、Pb和Cu约占80%，粗颗粒上的则不到20%。
