Role of surface oxygen species of mesoporous CeCu oxide catalyst in OVOCs catalytic combustion
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Catalytic combustion
Catalytic combustion of hydrogen/air mixture inside micro-tube was numerically investigated with detailed gas phase and surface catalytic chemical reaction mechanisms. Combustion characteristics for different reaction models, inlet velocity, tube diameter on surface catalytic combustion reaction, and comparison of numerical and experimental studies were discussed. The Computational results indicate that the surface catalytic combustion restrains the gas phase combustion. The effect of the surface catalytic reaction on the gas phase reaction can be divided to three types. The existence of catalytic wall will help to reach complete reaction in the micro-tube. Some theoretical evidences are provided for the application of catalytic combustion to Micro-electromechanical System (MEMS) and the extension of the combustion limits.
Catalytic combustion
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Abstract Catalytic combustion, as an alternative to conventional thermal combustion, has received considerable attention during the past decade. Research efforts have been promoted by the need to meet governmental demands concerning pollution and the wish to use energy sources more efficiently. The two main advantages offered by catalytic combustors over flame combustors apply to these goals: Catalytic combustion can be carried out over a wide range of fuel concentrations in air and at low temperatures. These low temperatures result in attaining NO, emission levels substantially lower than possible with conventional combustors.
Catalytic combustion
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Catalytic combustion of hydrogen/air mixture inside a micro-tube was numerically investigated by using the FLUENT coupled with the CHEMKIN and detailed chemical reaction mechanisms. The combustion characteristics of different reaction models and the influence of inlet velocity and tube diameters on surface catalytic combustion reaction were discussed. The computational results indicate that surface catalytic combustion restrains gas phase combustion. Inlet velocity and tube diameters have important influence on catalytic combustion of hydrogen. For smaller inlet velocities,reaction is dominated by gas phase combustion. As the inlet velocity increases,there exist both surface catalytic combustion and gas phase combustion. For bigger inlet velocities,reaction is dominated by surface catalytic combustion. The temperature of flame core decreases with the decrease of tube diameter. Some theoretical evidence is provided for the application of catalytic combustion to micro-electromechanical system(MEMS)and extension of combustion limits.
Catalytic combustion
CHEMKIN
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Abstract A review of the brief history of catalytic combustion in internal combustion (IC) engines suggests that catalytic combustion may aid in fuel ignition, but can also cause increased flame-quenching because of surface catalytic oxidation of unburned fuel in the gas boundary layer. The effect of catalytic combustion on heat transfer measurements in engines is also discussed, with the controversial Woschni effect, wherein thermal insulation appears to increase heat rejection from the combustion chamber, being shown to be probably only a manifestation of catalytic combustion. Keywords: Catalytic processesinternal combustion enginesNO x soot and particulates
Catalytic combustion
Autoignition temperature
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Catalytic combustion
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As a new way of combustion,catalytic combustion breaks the flammable limits of conventional flame combustion,and the combustion of ultra-natural gas/air mixture under the flammable limits is realized.Its combustion efficiency is higher,which can improve the ratio of energy utilization.Base on investigating the catalytic combustion tchnology and the characteristics of energy utilization in China, a heating system of catalytic combustion burner was presented.The characteristic of this system was analyzed.The combustion efficiency and socioeconomic benefit of catalytic combustion burner were analyzed.The conclusion that catalytic combustion burner has the energy saving and environmental protection is proposed.
Flammable liquid
Catalytic combustion
Gas burner
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The gas boilers of conventional flame always produce varying degrees of combustion products NOx and CO, which pollute the environment and waste energy. As a new way of combustion, catalytic combustion breaks the flammable limits of conventional flame combustion, and realizes the combustion of ultra-natural gas/air mixture under the flammable limits. Its combustion efficiency is higher, which improves the ratio of energy utilization. Applying the catalytic combustion to gas boilers could solve the gas boilers' lower combustion efficiency, and achieve energy savings. On the basis of the catalytic combustion burner, the catalytic combustion burner was designed according to the catalytic combustion and water heaters. In this paper, we analyzed the heat loss and thermal efficiency of the catalytic combustion burner, and compared it to that of flame combustion boilers. The results showed that catalytic combustion burner �'s heat loss is not so high as originally considered, and its pollutant emissions are lower.
Catalytic combustion
Flammable liquid
Gas burner
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Catalytic combustion,which achieved the combustion of lean-natural gas/air mixture below the flammability limit of conventional combustion and improved the ratio of energy utilization with 100% fuel efficiency.To improve the catalytic combustion thermal efficiency,on the basis of catalytic combustion burner Ⅱ,the catalytic combustion burner Ⅳ was designed.Moreover,the combustion conditions of catalytic combustion and gas phase combustion in burner IV were analyzed respectively,and the thermal efficiency of catalytic combustion was compared with gas phase combustion.Experimental result shows that under other similar conditions,catalytic combustion has higher thermal efficiency than that of gas phase combustion when excess air ratios of catalytic combustion was higher.
Catalytic combustion
Flammability limit
Thermal efficiency
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The gas boilers of conventional flame always produce varying degrees of combustion products NOx and CO,which make the environmental pollution and energy waste.As a new way of combustion,catalytic combustion breaks the flammable limits of conventional flame combustion,and realizes the combustion of ultra-natural gas/air mixture under the flammable limits.Its combustion efficiency is higher,which can improve the ratio of energy utilization.The way of applying the catalytic combustion to gas boilers could solve the gas boilers' lower combustion efficiency,and achieve the purpose of energy-saving.On the basis of catalytic combustion burner Ⅰ,the catalytic combustion burner Ⅱ was designed according to the catalytic combustion and water heaters.The heat loss and thermal efficiency of catalytic combustion burner Ⅱwere analyzed and compared with that of flame combustion boilers.The results show that catalytic combustion burner Ⅱ's heat loss is not so high as considered,and its pollutant emissions are lower.
Catalytic combustion
Flammable liquid
Gas burner
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In this thesis,a series of perovskite catalysts are prepared with the method of explosion.The catalytic combustion of methylbenzene is compared with non catalytic combustion,it is found that the catalytic combustion has the advantage of lower reaction temperature and less consumption of heat.By means of tests of XRD,TPR,and activity evaluation,it is concluded that the adsorbed oxygen with low combinative energy on these catalysts exertes pivotal action for the reaction of methylbenzene catalytic combustion.
Catalytic combustion
Environmental Pollution
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