Transformation of phosphorus during combustion of coal and sewage sludge and its contributions to PM10
Transformation of phosphorus during combustion of coal and sewage sludge and its contributions to PM10
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DOI：
10.1016/j.proci.2006.07.113
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Lian Zhang;Y. Ninomiya
中科院分区：
文献类型：
--
作者：
Lian Zhang;Y. Ninomiya
在实验室规模的滴管炉中，研究了煤和污水污泥样品燃烧时空气中含磷颗粒物的排放。结果表明，在非化学计量比下，有机结合态磷及其无机形态的硅、铝、钙、铁、磷和氧的络合物都容易汽化。生成的磷蒸气经过氧化、与其他金属蒸气(包括Na/K/Zn)的化学反应、成核和均相/非均相凝聚，形成粒度小于1.0μm的氧化物和磷酸盐的混合物。另一方面，较大部分的磷主要由磷灰石和凝聚的熔融相组成，这可能是通过直接释放原始燃料中固有的磷灰石和从焦炭表面脱落熔融的含磷颗粒而形成的。不同燃料类型和不同燃烧条件下，PM10各组分中的磷含量有很大差异。
Emission of airborne P-bearing particulates from combustion of both coal and sewage sludge samples has been studied in a lab-scale drop tube furnace. The results indicate that both the organically bound fraction of phosphorus and its inorganic species in a complex form containing Si, Al, Ca, Fe, P and O at non-stoichiometric ratios appear to vaporize readily. The resultant phosphorus vapors undergo oxidation, chemical reactions with other metallic vapors including Na/K/Zn, nucleation, and homogeneous/heterogeneous coagulation to form a mixture of their oxides and phosphates with particle sizes smaller than 1.0μm. On the other hand, phosphorus in the larger fractions, >1.0μm, mainly consist of apatite and condensed melting phases, which may have been formed through the direct liberation of inherent apatite in raw fuels and the shedding of melting P-bearing particles from the char surface. The amounts of phosphorus in each fraction of PM10vary considerably with fuel type and combustion conditions.