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Research on Detailed Chemical Kinetic Simulation of PAHs Formation during Hydrocarbon Fuel Combustion Process

Author: FengZhenZhen
Tutor: CaoYuChun
School: Zhengzhou University
Course: Thermal Power Engineering
Keywords: Hydrocarbon gas fuel Chemical reaction mechanism Laminar premixed flame PAHs Dynamics simulation
Type: Master's thesis
Year: 2011
Downloads: 22
Quote: 0
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In recent years, continuously improve the efficiency of the use of fossil fuels at the same time, with the environmental protection requirements continue to increase emissions of organic pollutants in the combustion process has drawn increasing attention in the development of clean combustion equipment by burning the process of chemical reaction kinetics deeper understanding of it is particularly important to control the emission of pollutants. Hydrocarbon fuel combustion process of polycyclic aromatic hydrocarbons (PAHs) in the formation, growth and oxidation kinetics research has been the research focus of the combustion sector. This article through the updated model of the generation mechanism of PAHs, the layers of C2-C4 hydrocarbon fuels premixed flame detailed chemical kinetics simulation, and the results are compared with the experimental values, while the use of sensitivity analysis methods, explore The key factors, the basic law and means of access to the general hydrocarbon fuels PAHs generated control PAHs generated in the combustion process, the theoretical basis for the generation of PAHs in the combustion process control. For methane laminar premixed flame, the same combustion temperature and pressure, different combustion equivalence ratio (Φ = 2.0,2.2,2.4,2.6) conditions, the aliphatic hydrocarbons, aromatic hydrocarbons and the concentration of PAHs generates different dependence on the equivalence ratio, PAHs than simple aromatic and aliphatic hydrocarbons, the dependence of Φ of C2H2 on the sensitivity of the minimum equivalence ratio Φ lt; 2.4, with the upward trend when the ratio increases, the carbon black particles and PAHs formation . For ethane laminar premixed flame, the same C / O ratio and combustion temperature, differential pressure (P = 0.8 bar.1.0 bar and 1.2 bar) conditions, with the improvement of the reaction pressure, various PAHs generation has must increase, but it generated did not affect the overall trend. The use of sensitivity analysis, the propane burner the reduced mechanism N (contains 30 kinds of chemical components and 42 elementary reactions), with Konnov the detailed mechanism calculated accuracy very close to atmospheric pressure can be used for practical engineering propane flame combustion research, both You can get a reasonably accurate prediction results, but also can reduce the computation time. Calculated butane flame PAHs generation, and the results show that, The propynyl the recombination reactions play a major role in the process of the formation of PAHs demonstrated PAHs grew up in the dehydrogenation plus acetylene (HACA) \Ethylene add ethanol laminar premixed flame synthesis mechanism M good forecast generation trends of PAHs concentration mass fraction (α), add ethanol to have a major impact on the the PAHs formation process and emissions, with the coefficient α increases, various PAHs generation has reduced, but did not affect their generate trend. For acetylene laminar flow premixed flame, by calculating the impact of the A1, A2, and A3 components generation and consumption of the most important reaction net yield (ROP), found that ROP where the greatest change is concentrated in the the flame export 0.5 ~ 1.0 cm within , 2H2CCCH = A1 is the most important reaction of benzene formation, P2-1 C2H2 = A3 H is the dominant reaction Philippine generated.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Fuel and combustion
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