Journal
ENERGY
Volume 106, Issue -, Pages 431-442Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2016.03.087
Keywords
Dilution; Thermal characteristics; Heat release contribution; Emission index; Profit-loss ratio
Categories
Funding
- Natural Science Foundation Project of Chongqing CSTC [cstc2012jjjq90002]
- Open Fund of State Key Laboratory of Coal Mine Disaster Dynamics and Control [2011DA105287-KF201304]
- Open research fund form Key Laboratory of special Power Supply [MSP2014-01]
- National Natural Science Foundation of China [50706058, 51076167]
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The measurement of flame temperature profile and flame computation were conducted to analyze the effects of carbon dioxide and nitrogen dilution on methane/air flames. Results indicated that carbon dioxide addition shows more significant effects on the thermal properties of flame, except for flame thickness. Flame kinetic analyses were implemented for the heat release of individual reaction. It is suggested that the heat release contribution of dominant reaction is primarily affected by flame stoichiometry, while the dilution shows weak effect. The concentrations of reactive species play important influences on the progress rate of reaction. The peak product of reactive species concentrations of the dominant reactions could be approximated by an exponent expression of the concentration of initial reactants and dilution rate, and a greater exponential index was obtained for the flames with carbon dioxide addition. The emission indices and combustion efficiency were evaluated to assess the profit in NO suppression and the loss in combustion deterioration. Results indicated that the profit-loss ratio is influenced by both flame equivalence ratio and the component of diluent gas. For rich methane/air flame, nitrogen dilution shows a greater value, while a larger benefit is obtained for stoichiometric flame diluted by carbon dioxide. (C) 2016 Elsevier Ltd. All rights reserved.
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