http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Carbon dioxide reforming of methane with a free energy minimization approach
Jin Baosheng,Li Yanbing,Xiao Rui 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.4
dioxide reforming of methane to syngas is one of the primary technologies of the new poly-gen-eration energy system on the basis of gasification gas and coke oven gas. A free energy minimization is applied to studythe influence of operating parameters (temperature, pressure and methane-to-carbon dioxide ratio) on methane con-version, products distribution, and energy coupling between methane oxidation and carbon dioxide reforming methane.The results show that the methane conversion increases with temperature and decreases with pressure. When the meth-ane-to-carbon dioxide ratio increases, the methane conversion drops but the H2/CO ratio increases. By the introductionand the CO/H2 ratio can be adjusted as well without water-gas shift reaction for Fischer-Tropsch or methanol synthesis.
Effect of operating conditions on gas components in the partial coal gasification with air/steam
Yaji Huang,Baosheng Jin,Zhaoping Zhong,Rui Xiao,Hongcang Zhou 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.4
increasing environmental considerations and stricter regulations, coal gasification, especially partialcoal gasification, is considered to be a more attractive technology than conventional combustion. Partial coal gasifica-tion was conducted in detail under various experimental conditions in a lab-scale fluidized bed to study the factors thataffected gas components and heating value, including fluidized air flow rate, coal feed rate, and steam feed rate, gas-ification temperature, static bed height, coal type and catalyst type. The experiment results indicate that gasificationtemperature is the key factor that affects components and the heating value of gas is in direct proportion to gas-bed height, which show more complex effect on gas components. High rank bitumite coal is much more suitable forgasification than low rank bitumite coal. The concentrations of H2, CO and CH4 of bitumite coal are more than thoseof anthracite coal. Compounds of alkali/alkaline-earth metals, such as Ca, Na, K etc., enhance the gasification rate con-siderably. The catalytical effects of Na2CO3 and K2CO3 are more efficient than that of CaCO3.
Experimental study of the influence of sodium salts as additive to NOxOUT process
Zhaoping Zhong,Xiujin Liang,Baosheng Jin,Xiaolin Chen,Weiling Li,Hongge Wei,Houkun Guo 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.5
An experimental study of the SNCR process with urea as reducing agent and sodium salts as additive has been carried out, and detailed analysis of the reaction mechanism has been given here. In the temperature range of 800-975 oC, NO concentration decreases at first and then increases while the concentration of N2O increases at first and then decreases with the increasing of temperature, and the turning point is 900 oC. With increasing of normalized stoichiometric ratio of reduction nitrogen to NOx (NSR), NO removal efficiency increases, while the concentration of N2O also increases, which decreases overall NOx removal efficiency. With sodium salts as additive, the concentration of N2O decreases with increasing of sodium salts addition at all temperatures, while the concentration of NO decreases at first and then increases at low-temperature side of the temperature window and increases at high-temperature side with additional increasing, whose changing extent is smaller than N2O. Since sodium salts as additive can remove N2O effectively and have no large influence on the removal of NO, the effect of sodium salts as additive is the combined effect of the production of active radicals and the removal of HNCO produced by the decomposition of urea through neutralization reactions, which is more important. To achieve the same effect under each condition, the needed addition of NaOH and CH3COONa is less than that of Na2CO3 counting as Na atom. For the decomposition of CH3COONa can produce CH3COO, its addition can promote the reduction of NO more obviously at the lower temperature than Na2CO3 or NaOH. Overall NOx removal efficiency at 900 oC with NSR=1.5 had been improved from about 30% to 70.45% through the addition of sodium salts. Sodium salts as additive caused the flue gas to become alkaline gas, but it was not serious for sodium salts existing as NaNCO.