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Gasification of rice husk in a cyclone gasifier
Shaozeng Sun,Feng Ling,Yijun Zhao,Fengming Su 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.2
The experimental results of air gasification of rice husk in the cyclone gasifier were presented at the fuel rate of 20.1 kg/h. With the equivalence ratios varied in the range of 0.21-0.32, the heating value of the producer gas decreases from 6.98 MJ/N㎥ to 3.11 MJ/N㎥ and the cold gas efficiency decreases from 64% to 31%. However, the tar content in the prouder gas decreases with the increase of the equivalence ratio. The rice husk and ash were examined under a scanning electron microscope (SEM) and energy dispersive X-ray (EDX) elemental analysis. The outer surface of the fuel particle which is of scale structure does not change basically during the gasification. The pyrolyzed gas is mainly released from the inner surface of the fuel particle.
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Kinetic analysis of NO-Char reaction
Shaozeng Sun,Xidong Hu,Penghua Qiu,Juan Qian,Yukun Qin,Juwei Zhang 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.2
Two Chinese coals were used to prepare chars in a flat flame flow reactor which can simulate the temperature and gas composition of a real pulverized coal combustion environment. Acid treatment on the YB and SH chars was applied to obtain demineralized chars. Kinetic characterization of NO-char reaction was performed by isothermal thermogravimetry in the temperature range of 973-1,573 K. Presence of catalytic metal matter can increase the reactivity of chars with NO, which indicates that the catalytic effects of inherent mineral matter play a significant role in the NO-char reaction. The discrete random pore model was applied to describe the NO-char reactions and obtain the intrinsic kinetics. The model can predict the data for all the chars at various temperatures well, but underestimate the reaction rates at high carbon conversions for the raw YB and SH chars, which can be attributed to the accumulation of metal catalyst on char surface.
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Kinetic modeling of non-hydrocarbon/nitric oxide interactions in a flow reactor above 1,400K
Shaozeng Sun,Zhiqiang Wang,Lin Qian,Yukun Qin,Huali Cao 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.3
The reduction of nitric oxide by reaction with non-hydrocarbon fuels under reducing conditions at comparatively higher temperature has been studied with a detailed chemical kinetic model. The reaction mechanism consists of 337 elementary reactions between 65 chemical species based on the newest rate coefficients. The experimental data were adopted from previous work. Analyses by comparing existing experimental data with the modeling predictions of this kinetic mechanism indicate that, at comparatively high temperature, apart from the reaction path NO→ HNO→NH→N2, NO+N→N2 is also prominent. In the presence of CO, NO is partly converted to N by reaction with CO. Based on present model, the reduction of NO at high temperature, which was usually underestimated by previous work, can be improved to some extent.
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Industrial test on coal re-burning at a 600MW utility boiler and NOx reduction
Penghua Qiu,Shaohua Wu,Shaozeng Sun,Hui Liu,Longbin Yang,Guozhong Wang 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.4
research conducts a series of industrial tests on coal reburning of a 600 MW pulverized coal boilerfiring lignite, which is one part of a coal reburning demonstration project. When running steadily under 60 MW load,the boiler has an average NOx emission of 274 mg/m3 (O2 content in flue gas is converted to 6% ), the NOx emissionis reduced by 65.36% . In the meanwhile, loss of ignition (LOI) under coal reburning rarely increases. Three operationconditions - traditional air feeding, air staging and coal reburning - are realized, respectively, during the industrial tests,and the results indicate that coal reburning has the lowest NOx emission, while the traditional air feeding has the highestNOx x controlcan reach.
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