Emissions of organic air toxics from open burning: a comprehensive review
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Polychlorinated dibenzodioxins
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In order to improve the accuracy of the test for boron powders combustion heat and determine the main factors affecting the uncertainty of boron powders combustion heat test under the combustion-supporting condition,the direct assessment method was adopted to analyze the uncertainty based on boron powders ignition and combustion characteristics as well as the principle of boron powders combustion heat test under the combustion-supporting condition.The impact degree of various factors on uncertainty of boron powders combustion heat value testing were calculated.Results show that the main factors affecting the uncertainty for boron powders combustion heat test are the temperature rise of the calorimetric system,the calorific value of combustion-supporting agent,and the mass of boron powders involved in the combustion.Reducing the uncertainty of calorific capacity of the calorimetric system,can increase the accuracy of measurement for boron powders combustion heat value.The relative uncertainty of boron powders combustion heat value test using combustion-supporting agent is only 0.95%.
Heat of combustion
Autoignition temperature
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Autoignition temperature
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Continuous measurement of combustion temperature and speed in a magnetic field was studied to precisely determine the nature of combustion in a field. When methanol was burned in a magnetic field, combustion speed only decreased to a low value at 0.9 T. Combustion reaction speed is inhibited at 0.9 T, and it seems that effectively the combustion temperature is reduced. Also, there is a tendency to large fluctuations of combustion temperature variation amplitude and frequency in the magnetic field.
Rotating magnetic field
Adiabatic flame temperature
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Fundamental combustion characteristics of lifted flames at high-temperature oxygen combustion conditions were investigated experimentally and numerically. Two types of the flame structures for lifted flames were identified by experimental flame images captured by a still camera with a CH band-pass filter as well as computations. One could be classified to be a tribrachial lifted flame, and the other could be classified to be mild combustion. In 2-D computations, the reaction zone was formed beyond the stoichiometric line at mild combustion conditions.
Adiabatic flame temperature
Stoichiometry
Limiting oxygen concentration
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Abstract The recently introduced concept of percolate combustion motivates a refinement of the internal group combustion model analyzed by Chiu and coworkers. The continuous flame sheet separating com busting and non-combusting regions, regarded in the latter model as occupying a zone of negligible thickness, is here regarded as a highly convoluted surface occupying a zone of finite thickness, the "percolate combustion" zone. A simple model is employed to estimate the fraction of the combusting region that is within the percolate combustion zone. This fraction is estimated to be significant for internal group combustion regimes of practical interest. It is proposed that more detailed spray combustion models can incorporate percolation effects by modification of the transport equations and the matching conditions. Possible impacts of such modifications, including practical consequences of percolation effects, are discussed.
Percolation (cognitive psychology)
Fraction (chemistry)
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Fraction (chemistry)
Elongation
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Dilution
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Abstract A short information is given on the results of work carried out at the Branch of the Institute of Chemical Physics, U.S.S.R. Academy of Sciences, since 1967 on studying the combustion processes caused by the interaction of chemical elements in the condensed phase and leading to the formation of refractory compounds. New phenomena and processes are described which are revealed when investigating the combustion of the systems of this class, viz solid-phase combustion.fast combustion in the condensed phase, filtering combustion, combustion in liquid nitrogen, spinning combustion, self-oscillating combustion and repeated combustion. A new direction in employment of combustion processes is discussed, viz. a self-propagating high-temperature synthesis of refractory nitrides, carbides, borides, silicides and other compounds.
Combustion products
Refractory (planetary science)
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Abstract In this paper, the effects of CuO powder on the combustion and micro-explosion characteristics of Mg and Al 12 Mg 17 were studied. A laser was used to ignite particles and a high-speed micro-camera was used to record the particle ignition, flame propagation, combustion and particle changes before and after micro-explosion. Moreover, emission spectra during combustion and combustion products were analysed. The results show that the addition of CuO contributes to the micro-explosion of Mg particles during combustion, but it is not conducive to the micro-explosion of Al 12 Mg 17 particles. Meanwhile, whether Al 12 Mg 17 particles or Al 12 Mg 17 /CuO particles, the radiation peaks during combustion mainly correspond to Mg or MgO, which means that the addition of CuO cannot promote the gas phase combustion of Al in Al 12 Mg 17 .
Particle (ecology)
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