Exhaust Emissions
Mostrando 13-24 de 30 artigos, teses e dissertações.
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13. Amostragem do material particulado e fração orgânica volátil das emissões em motor ciclo diesel sem a utilização de túnel de diluição
Using a sampling method of particulate matter (PM) without the use of a dilution tunnel allows for evaluations of the volatile hydrocarbons (HC) in the emissions of diesel cycle engines. The procedure in this work applied a heated filter with temperature controlled. The volatile compounds are condensed at low temperature, allowing for evaluation of the HC by
Química Nova. Publicado em: 2008
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14. ÉSTERES COMBUSTÍVEIS EM MOTOR DE CICLO DIESEL SOB CONDIÇÕES DE PRÉ-AQUECIMENTO E VARIAÇÃO NO AVANÇO DE INJEÇÃO / ESTERS FUELS IN DIESEL ENGINES UNDER PRE-HEATING CONDITIONS AND VARYING INJECTION TIMING
The renewed interest in energy for biomass is supported by the need for different energy sources and the need to protect the environment. Recently, because of increases in crude oil prices, limited resources of fossil oil and environmental concerns there has been renewed focus on vegetable oils and animal fats to make a biodiesel fuel. What is known as biodi
Publicado em: 2008
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15. Assessment of mercury emissions from brazilian coal combustion in fast fluidized bed / Estudo das emissões de mercurio na combustão de carvão mineral brasileiro em leito fluidizado rapido
In this work, total mercury emissions from fast fluidized bed combustion of CE-4500 Brazilian coal and dolomite mixtures were quantified. Stack gas samples were collected downstream of a baghouse by using an isokinetic probe and U.S. E.P.A. n. 29 / ASTM-D-6784 (Ontario-Hydro) method procedures. The ash samples trapped in the particulate control device and th
Publicado em: 2007
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16. Investigação de dioxinas, furanos, hidrocarbonetos policíclicos aromáticos no material particulado e gases emitidos por motores diesel / Investigation of dioxins, furans and polycyclic aromatic hydrocarbons in particulate material and gases emitted by diesel engines.
To investigate emission of chlorinated dioxins and furans (PCDD/Fs) and polycyclic aromatic hydrocarbons (PAHs) in heavy duty diesel engines, through the analysis of particulate material and gases in the exhaust.To verify mutagenicity of collected particulate material and gasesous sample extracts. Material and Methods: The engine emissions tests were done in
Publicado em: 2007
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17. Issuance of metals by motor vehicles and their effects on public health / Emissão de metais por veículos automotores e seus efeitos à saúde pública
Introduction: The presence of fine metal particles in the urban atmosphere is a big concern considering that a significant accumulation of these elements has been registered during the last decades. Information about metal level in the tailpipe is scarce and specific Brazilian emission references are basically inexistent. Objective. Experimentally characteri
Publicado em: 2007
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18. EXPERIMENTAL INVESTIGATION AND PERFORMANCE ESTIMATE OF DIESEL ENGINES BURNING NATURAL GAS / AVALIAÇÃO EXPERIMENTAL E PREVISÃO DO DESEMPENHO DE MOTORES DIESEL CONSUMINDO GÁS NATURAL
Four Diesel engines, all running on the Diesel / natural gas dual fuel mode, were dynamometer tested. Engines were selected based on their distinct construction, operating parameters and engine field use. The Diesel / natural gas substitution was varied in order to determine the dual fuel operation limits. Measurements related to particulate emissions (smoke
Publicado em: 2006
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19. Reduction of pollutants emissions on SI engines: accomplishments with efficiency increase
This paper presents an experimental study aiming to identify the means to minimize the reduction of the overall performance of a gasoline engine when employing the Exhaust-Gas Recirculation (EGR) technique that reduces NOx emissions. The increase of the compression ratio and turbocharging was evaluated as a mean to recover the original performance. The forma
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-09
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20. A poluição gerada por máquinas de combustão interna movidas à diesel - a questão dos particulados. Estratégias atuais para a redução e controle das emissões e tendências futuras
The exhaust emissions of vehicles greatly contribute to environmental pollution. Diesel engines are extremely fuel-efficient. However, the exhaust compounds emitted by diesel engines are both a health hazard and a nuisance to the public. This paper gives an overview of the emission control of particulates from diesel exhaust compounds. The worldwide emission
Química Nova. Publicado em: 2004-06
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21. Study of the machinability of compacted graphite iron for drilling process
CGI - Compacted Graphite Iron - has reached an important status for automotive industry, mainly in the last ten years. The material has been used for manufacturing parts as brake discs, exhaust manifolds, engine heads and diesel engine blocks. The superior strength characteristics of CGI, as compared to gray iron, allows the manufacturing of engines for high
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2004-03
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22. AVALIAÇÃO DE DESEMPENHO DO ÓLEO DE SOJA COMO COMBUSTÍVEL PARA MOTORES DIESEL / EV ALUA TION OF SOYBEAN OIL PERFORMANCE AS A FUEL FOR DIESEL ENGINES
The renewed interest in energy for biomass is supported by the need for different energy sources and the need to protect the environment. Recently, because of increases in crude oil prices, limited resources of fossil oil and environmental concerns there has been renewed focus on vegetable oils and animal fats to make a biodiesel fuel. What is known as biodi
Publicado em: 2003
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23. Desenvolvimento de sensores quimicos com fibras opticas para a determinação quantitativa de fuligem e de monoxido de carbono emitidos por veiculos automotores
In this work were developped two portable devices for quantitative determination of automotive pollution by diffuse reflectance. One is for measurements of the smoke emissions from vehicles by diesel cycle and other for measurements of the carbon monoxide emissions from vehicle by Otto cycle. Both are of easy operation and were developed for the measurements
Publicado em: 1999
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24. Mortality among members of a heavy construction equipment operators union with potential exposure to diesel exhaust emissions.
A historical prospective mortality study was conducted on a cohort of 34 156 male members of a heavy construction equipment operators union with potential exposure to diesel exhaust emissions. This cohort comprised all individuals who were members of the International Union of Operating Engineers, Locals 3 and 3A, for at least one year between 1 January 1964