Evaluation of a constant volume sampling setup for residential biomass fired appliances - influence of dilution conditions on particulate and PAH emissions
Evaluation of a constant volume sampling setup for residential biomass fired appliances - influence of dilution conditions on particulate and PAH emissions
复制标题
DOI：
10.1016/j.biombioe.2005.03.003
复制
发表时间：
2005-01-01
影响因子：
6
通讯作者：
Pettersson, E
中科院分区：
文献类型：
--
作者：
Boman, C;Nordin, A;Pettersson, E
越来越多的关注颗粒物（PM）和多环芳烃（PAH）的排放量从住宅生物质燃烧及其潜在的健康影响，激励详细的排放测量控制条件下。在原始烟道气中的传统取样可能遭受主要与瞬态流动和有机化合物的可冷凝性质有关的缺点。定容采样（CVS）的全流稀释是一种替代方法，但不同的采样条件可能会影响排放特性。目的是设计一个CVS系统，用于测量住宅生物质燃烧器具的排放，并确定稀释采样条件对PM和PAR特征和分布的影响。稀释比（3- 7 x）、取样温度（45-75 ℃）、稀释隧道停留时间（2-4 s）和燃料负荷（2.3和4.8 kW）。采样条件不影响PM、CO和NO的排放浓度和粒径分布。停留时间的变化对任何研究的排放参数没有显着影响。然而，有机气态碳（OGC）和PAH的浓度增加，观察到与稀释比增加。颗粒和半挥发性相之间的分布的影响，为12的37个分析的PAH化合物，主要是在较高的采样温度下的半挥发性物质的馏分增加。没有观察到采样温度的影响的浓度的多环芳烃（总）或主要的多环芳烃化合物，即菲，荧蒽和芘。结果连同实际考虑还表明在50 +/-5 ° C和3-4倍稀释下取样是目前设计的设置中的稳健和适用条件。(c)2005爱思唯尔有限公司保留所有权利。
Increased concerns about particulate matter (PM) and polycyclic aromatic hydrocarbons (PAH) emissions from residential biomass combustion and their potential health effects, motivates detailed emission measurements under controlled conditions. Traditional sampling in raw flue gases can suffer from drawbacks mainly related to transient flows and the condensable nature of organic compounds. Whole flow dilution with constant volume sampling (CVS) is an alternative method but different sampling conditions may, however, influence the emission characteristics. The objective was to design a CVS system for emission measurements in residential biomass fired appliances and determine the influence of dilution sampling conditions on the characteristics and distributions of PM and PAR Softwood pellets were combusted in a pellet stove with variations in; dilution ratio (3-7x), sampling temperature (45-75 degrees C), dilution tunnel residence time (2-4 s) and fuel load (2.3 and 4.8 kW) according to a statistical experimental design. The sampling conditions did not influence either the emission concentrations of PM, CO and NO or the particle size distribution. Variations in residence time had no significant effect on any studied emission parameter. However, increased concentrations of organic gaseous carbon (OGC) and PAH were observed with increased dilution ratio. The distribution between particulate and semivolatile phase was influenced for 12 of the 37 analyzed PAH compounds, mainly by increased fractions of semivolatile material at higher sampling temperature. No influence of sampling temperature was observed for the concentrations of PAH(tot) or the dominating PAH compounds, i.e. phenanthrene, fluoranthene and pyrene. The results together with practical considerations also suggest sampling at 50 +/- 5 degrees C and 3-4 times dilution as robust and applicable conditions in the presently designed setup. (c) 2005 Elsevier Ltd. All rights reserved.