Experimental study on morphology of betula crib soot particles sampled at different heights

doi:10.16265/j.cnki.issn1003-3033.2017.09.010

Abstract

Abstract: To understand the soot formation of typical fuels at different heights from burn surface, experiments were carried out, the size and morphology of soot aggregates produced from burning of a betula crib were studied by both extractive sampling and subsequent image analysis. The morphology of soot was observed by scanning electron microscope(SEM). The morphology of soot aggregates and the diameter distribution of primary particles were analyzed for the soot sampled at different heights. The results show that when sampling heights are not greater than 0.8 m, irregular sheet structures and flake-like masses are observed from the burning of the crib, that burning of the crib can produce tar, which adheres on the surface of the sampling grid, that the size and thickness of the coating layer decreases with increasing height, that the amount of small particles in the fragments increases with increasing height, and that the average diameter of the primary particles is 44-47 nm when sampling is made at different heights above the fire source.

Key words: betula crib, plume vertical height, soot particle, morphology, particle size distribution, tar

CLC Number:

X932

ZHANG Yi, GUO Chenning. Experimental study on morphology of betula crib soot particles sampled at different heights[J]. China Safety Science Journal, 2017, 27(9): 57-62.

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