Size distribution and concentration of soot generated in oil and gasfired residential boilers under different combustion conditions

Jimenez, Santiago (Universidad de Zaragoza) ; Barroso Estébanez, Jorge Angel (Universidad de Zaragoza) ; Pina, Antonio ; Ballester, Javier (Universidad de Zaragoza)

Resumen: In spite of the relevance of residential heating burners in the global emission of soot particles to the atmosphere, relatively little information on their properties (concentration, size distribution) is available in the literature, and even less regarding the dependence of those properties on the operating conditions. Instead, the usual procedure to characterize those emissions is to measure the smoke opacity by several methods, among which the blackening of a paper after filtering a fixed amount of gas (Bacharach test) is predominant. In this work, the size distributions of the particles generated in the combustion of a variety of gaseous and liquid fuels in a laboratory facility equipped with commercial burners have been measured with a size classifier coupled to a particle counter in a broad range of operating conditions (air excesses), with simultaneous determination of the Bacharach index. The shape and evolution of the distribution with progressively smaller oxygen concentrations depends essentially on the state of the fuel: whereas the combustion of the gases results in monomodal distributions that ‘shift’ towards larger diameters, in the case of the gas-oils an ultrafine mode is always observed, and a secondary mode of coarse particle grows in relevance. In both cases, there is a strong, exponential correlation between the total mass concentration and the Bacharach opacity index, quite similar for both groups of fuels. The empirical expressions proposed may allow other researchers to at least estimate the emissions of numerous combustion facilities routinely characterized by their smoke opacities.

Idioma: Inglés

DOI: 10.1016/j.atmosenv.2016.03.012

Año: 2016

Publicado en: Atmospheric Environment 133 (2016), 60-67
ISSN: 1352-2310

Factor impacto JCR: 3.629 (2016)

Categ. JCR: METEOROLOGY & ATMOSPHERIC SCIENCES rank: 16 / 84 = 0.19 (2016) - Q1 - T1
Categ. JCR: ENVIRONMENTAL SCIENCES rank: 49 / 229 = 0.214 (2016) - Q1 - T1

Factor impacto SCIMAGO: 1.495 - Environmental Science (miscellaneous) (Q1) - Atmospheric Science (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/Consolider-Ingenio/CSD2010-00011

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Mecánica de Fluidos (Dpto. Ciencia Tecnol.Mater.Fl.)