Predicting the Physical Properties of Biodiesel for Combustion Modeling

Yuan, Wenqiao; Hansen, Alan C.; Zhang, Q.

doi:10.13031/2013.15631

Cited by 117 publications

(92 citation statements)

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“…For unsaturated methyl esters (with non-zero double bonds, DB≥ 1) the liquid kinematic viscosity can be estimated based on the following formula, valid in temperature range T ≤ 0.7 T cr [31,35]:…”

Section: Liquid Viscositymentioning

confidence: 99%

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Modelling of biodiesel fuel droplet heating and evaporation

Sazhin

Qubeissi

Kolodnytska

et al. 2014

Fuel

112

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Biodiesel fuel droplet heating and evaporation is investigated using the previously developed models, taking into account temperature gradient, recirculation, and species diffusion within droplets. The analysis is focused on four types of biodiesel fuels: Palm Methyl Ester, Hemp Methyl Esters, Rapeseed oil Methyl Ester, and Soybean oil Methyl Ester. These fuels contain up to 15 various methyl esters and possibly small amounts of unspecified additives, which are treated as methyl esters with some average characteristics. Calculations are performed using two approaches: 1) taking into account the contribution of all components of biodiesel fuels (up to 16); and 2) assuming that these fuels can be treated as a one component fuel with averaged transport and thermodynamic coefficients. It is pointed out that for all types of biodiesel fuel the predictions of the multi-component and single component models are rather close (the droplet evaporation times predicted by these models differ by less than about 5.5%). This difference is much smaller than observed in the case of Diesel and gasoline fuel droplets, and is related to the 1 Corresponding author, e-mail: S.Sazhin@brighton.ac.uk Preprint submitted to FuelMarch 28, 2013 fact that in the case of Diesel and gasoline fuel droplets the contribution of components in a wide range of molar masses and enthalpies of evaporation needs to be taken into account, while in the case of biodiesel fuels the main contribution comes from the components in a narrow range of molar masses and enthalpies of evaporation. As in the case of Diesel and gasoline fuel droplets, the multi-component model predicts higher droplet surface temperature and longer evaporation times than the single component model.

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Section: Liquid Viscositymentioning

confidence: 99%

“…The following approximation for the saturated vapour pressure of SME (in bars) was suggested in [57], based on data provided by [59]:…”

Section: Appendix 3 Transport and Thermodynamic Properties Of Biodiesmentioning

confidence: 99%

Modelling of biodiesel fuel droplet heating and evaporation

Sazhin

Qubeissi

Kolodnytska

et al. 2014

Fuel

112

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“…In general, BSF personal-breathing zone exposures (Personal-breathing zone exposures from this point forward will be referred to as exposures) for HMA paving workers were below the American Conference of Governmental Industrial Hygienists (ACGIH ® ) threshold limit value-time weighted average (TLV ® -TWA) of 0.5 mg/m 3 as inhalable benzene-soluble aerosol (24) which has been shown to be equivalent to BSF of total particulate asphalt fume exposures. (25,26) However, three HMA paving workers had exposures that exceeded this TLV ® during a sampling day when the HMA paving crew used an older paver configured with a diesel-powered screed.…”

Section: Discussionmentioning

confidence: 99%

Personal Breathing Zone Exposures among Hot-Mix Asphalt Paving Workers; Preliminary Analysis for Trends and Analysis of Work Practices That Resulted in the Highest Exposure Concentrations

Osborn¹,

Snawder

Kriech³

et al. 2013

Journal of Occupational and Environmental Hygiene

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An exposure assessment of hot-mix asphalt (HMA) paving workers was conducted to determine which of four exposure scenarios impacted worker exposure and dose. Goals of this report are to present the personal-breathing zone (PBZ) data, discuss the impact of substituting the releasing/ cleaning agent, and discuss work practices that resulted in the highest exposure concentration for each analyte.One-hundred-seven PBZ samples were collected from HMA paving workers on days when diesel oil was used as a releasing/cleaning agent. An additional 36 PBZ samples were collected on days when B-100 (100% biodiesel, containing no petroleum-derived products) was used as a substitute releasing/cleaning agent. Twenty-four PBZ samples were collected from a reference group of concrete workers, who also worked in outdoor construction but had no exposure to asphalt emissions. Background and field blank samples were also collected daily. Total particulates and the benzene soluble fraction were determined gravimetrically. Total organic matter was determined using gas chromatography (GC) with flame ionization detection and provided qualitative information about other exposure sources contributing to worker exposure besides Author Manuscript Author ManuscriptAuthor ManuscriptAuthor Manuscript asphalt emissions. Thirty-three individual polycyclic aromatic compounds (PACs) were determined using GC with time-offlight mass spectrometry; results were presented as either the concentration of an individual PAC or a summation of the individual PACs containing either 2-to 3-rings or 4-to 6-rings. Samples were also screened for PACs containing 4-to 6-rings using fluorescence spectroscopy.Arithmetic means, medians, and box plots of the PBZ data were used to evaluate trends in the data. Box plots illustrating the diesel oil results were more variable than the B-100. Also, the highest diesel oil results were much higher in concentration than the highest B-100 results. An analysis of the highest exposure results and field notes revealed a probable association between these exposures and the use of diesel oil, use of a diesel-powered screed, elevated HMA paving application temperatures, lubricating and working on broken-down equipment, and operation of a broom machine.

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“…Para os ésteres metílicos observou 620,80 K (óleo de soja) a 642,14 K (óleo de colza), no entanto para os ésteres etílicos encontrou-se 628,39 K e 635,39K (óleo de colza). Yuan et al (2003) determinaram as propriedades críticas para os ésteres metílicos do óleo de soja, a temperatura, pressão e volume críticos obtidos, respectivamente, foi 785,7 K, 12,08 bar e 1,082 m 3 /kmol. Os dados encontrados neste trabalho encontram-se em faixas aceitáveis quando comparado com dados experimentais de óleos vegetais similares.…”

Section: Propriedades Para O óLeo Da Polpa Da Macaúbaunclassified

Predição Das Propriedades Físicas E Termodinâmicas Do Óleo Da Polpa Da Macaúba E Biodiesel Por Método De Contribuição De Grupos

Silva¹,

Andrade²

2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -O conhecimento das propriedades físicas e termodinâmicas dos óleos em processos oleoquímicos, principalmente envolvidos na produção de biodiesel são essenciais para a engenharia de processo. Apesar de vários estudos relatarem essas propriedades para alguns compostos, há ainda uma necessidade de expandir o banco de dados existentes na literatura. Em contraste com os métodos tradicionais baseados em correlações de dependência da temperatura, neste trabalho, os métodos de contribuição de grupo foram aplicados, não só pela sua aproximação com os valores reais como também pela facilidade na sua implementação. O objetivo do trabalho foi utilizar alguns métodos de estimativa para predizer algumas propriedades do óleo da polpa da macaúba e do biodiesel, a partir da composição inicial dos ácidos graxos, a saber: temperatura de ebulição; temperatura, pressão e volume críticos; energia livre de Gibbs de formação padrão e entalpia de formação. As estimativas foram comparadas com dados da literatura. Os resultados apresentaram alguns desvios entre as estimativas e os valores encontrados na literatura e mostraram a importância da comparação entre os diferentes métodos de estimativas para a predição de uma única propriedade, principalmente no caso de moléculas complexas. INTRODUÇÃOA utilização de biocombustíveis como substitutos dos combustíveis derivados do petróleo, tem sido realizada para amenizar problemas, tais como agravamento do efeito estufa, poluição ambiental e instabilidade econômica. Sendo assim, o biodiesel tem atraído a atenção de muitas pesquisas com o objetivo de viabilizar e otimizar sua produção.O biodiesel pode ser definido como uma mistura de monoesteres metílicos ou etílicos de cadeia longa proveniente de matérias-primas renováveis. Demirbas (2005) define que o biodiesel é uma variedade de combustível oxigenado a base de ésteres derivados de fontes renováveis. O biodiesel pode ser obtido por reações de esterificação das referidas matérias-primas; ou reações de transesterificação. Nestas reações, a matéria-prima reage com um álcool de cadeia curta (metanol ou etanol) resultando no monoester (biodiesel) e no glicerol (glicerina), na presença de um catalisador.Área temática: Engenharia das Separações e Termodinâmica 1

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Predicting the Physical Properties of Biodiesel for Combustion Modeling

Cited by 117 publications

References 0 publications

Modelling of biodiesel fuel droplet heating and evaporation

Modelling of biodiesel fuel droplet heating and evaporation

Personal Breathing Zone Exposures among Hot-Mix Asphalt Paving Workers; Preliminary Analysis for Trends and Analysis of Work Practices That Resulted in the Highest Exposure Concentrations

Predição Das Propriedades Físicas E Termodinâmicas Do Óleo Da Polpa Da Macaúba E Biodiesel Por Método De Contribuição De Grupos

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