SO2-NO2-NH3-H2O四元反应体系中气溶胶的生成特性

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Abstract The variations in concentration and diameter distribution of newly formed particulate matter, during the gas-to-solid conversion of the SO₂-NO₂-NH₃-H₂O quaternary system, were experimentally investigated with the smog chamber in this article. This quaternary system had a significant capability of nucleation, and a large nucleation intensity in such a short duration. When both of SO₂ and NO₂ concentrations were 200mg/m³ and NH₃ concentration was 12×10^-6, the total concentration of aerosols in this system reached a peak of 2.5×10⁶cm^-3 over two minute. Moreover, the nucleation strength of the aerosol would be reduced lacking in any one among three gases. Like this typical condition that SO₂, NO₂ or NH₃ concentration was zero, the maximum concentration of aerosols decreased by 41.0%, 83.6% and 98.5%, respectively. Within the concentration ranges of SO₂, NO₂ or NH₃ emitted from coal-fired power plants, the NO₂ had a greater influence than SO₂ on the formation and agglomeration of newly formed particles. Based on experimental results, the fitting curves for nucleation characteristics of particulate matters were made. A linear correlation was observed between the total number concentration of newly formed particles and median particle diameter, and gaseous pollutant concentrations. The Brown agglomeration model was adopted to simulate the changes in total number concentration and particle size distribution of aerosols after nucleation in the agglomeration process. Finally, a method was proposed for predicting the change in the particle size distribution and total number concentration of aerosol particles, based on the typical emission concentrations of SO₂, NO₂ and NH₃ from coal-fired power plants.

Key words： coal-fired power plant haze aerosol smog chamber nucleation agglomeration

Received: 11 December 2018

PACS:

X515

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	Articles by authors
	XIAO Jia-fan
	LIU He-xin
	TAN Hou-zhang
	DU Yong-le
	WANG Yi-bin

Cite this article:

XIAO Jia-fan,LIU He-xin,TAN Hou-zhang等. Formation characteristics of aerosols in the SO₂-NO₂-NH₃-H₂O quaternary system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(7): 2721-2729.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I7/2721

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