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岳光溪, 吕俊复, 金晓钟, 张建胜, 马明华*, 林旭东*, 于龙*, 杨艳萍*
热能动力工程,2000, 15(87):217~219,-0001,():
-1年11月30日
It was confirmed that the combustion action in dense bed is different between the bubbling bed and circulating fluidized bed by the measurement of the gas profile distribution and combustion fraction distribution along the furnace height. The bed quality results in the mass transfer resistance increasing, which effects the combustion reaction in dense bed. The combustion reaction in dense bed is in reduce condition. The combustion occurs all along the furnace even in the cyclone. A comprehensive model is proposed here to predict the axial gas concentration profile in the dense be, which is considered the mass transfer resistance between the solid and gas in dense bed. Calculations indicated that the resistance has a great effect on the combustion in the dense bed. Experimental data and results of the model are in good agreement.
Circulating fluidized bed, bubbling fluidized bed, dense bed, combustion action
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【期刊论文】INVESTINGATION ON THE HEAT TRANSFER IN A CFB BOILER
岳光溪, Jin Xiaozhong, Lu Junfu, Liu Qing, Li Yong, Zhang Jiansheng, Xing Xing and Yue Guangxi
Published in the 6th International Conference of CFBC, Weirsberg, 1999:356~361,-0001,():
-1年11月30日
Local bed to wall heat transfer coefficient in the furnace of a 75t/h CFB boiler was measured with a heat flux probe and bulk density sampling probe which were developed by Tsinghua University. The test result shows the strong relation between local heat transfer coefficient with the local bulk density and the bed temperature. The result was compared with the data from literature. According to the experimental data, a semi-empirical model was developed to predict the local heat transfer coefficient based on the bed temperature and bulk density. The prediction of the model is basically matching the published data.
CFB boiler,, heat transfer,, measurement,, semi-empirical model
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岳光溪, JIN Xiaozhong, LU Junfu, YANG Hairui, LIU Qing, YUE Guangxi, FENG Junkai
Published in Tsinghua Science and Technology, 2001, 6(4):319~325,-0001,():
-1年11月30日
Char combustion is on a special reducing condition in the dense bed of a circulating fluidized bed combustor. Experimental findings were used to develop comprehensive mathematical model to simulate the hydrodynamic and combustion processes in a circulating fluidized bed combustor. In the model, gas-solid interaction was used to account for the mass transfer between the bubble phase and the emulsion phase in the dense bed, which contributes to the reducing atmosphere in the dense bed. A core-annular structure was assumed in the dilute area rather than a onedimension model. The submodels were combined to build the comprehensive model to analyze the combustion in CFBC and the effect of operating parameters on the coal combustion. The model predictions agree well with experimental results.
reducing condition, gas-solid, mass transfer, volatiles release, core-annular.,
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【期刊论文】Modeling of Sulfur Retention in Circulating Fluidized Bed Coal Combustors
岳光溪, Qiao Rui, Lu Junfu, Liu Qing, Wu Xuean, Yue Guangxi
Published in Tsinghua Science and Technology, 2001, 6(4):314~318,-0001,():
-1年11月30日
A comprehensive model for predicting the sulfur retention performance in circulating fluidized bed combustors was developed which involves the different residence times, the wide particle size distribution and the different forms of sulfur in the coal. In addition, the reductive decomposition of CaSO4 is highlighted. The simulation results from the model show that the sulfur contents, the bed temperature, the sorbent particle size distribution and the sorbent activity or the maximum conversion rate can significantly influence the sulfur retention performance in CFB combustors.
circulating fluidized bed, sulfur retention, modeling
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岳光溪, A Molina, A F Sarofim, W Ren, J Lu, G Yue, J M Be
Publishen in Combustion Science and Technology, 2002, 174(11-12):43-71,-0001,():
-1年11月30日
The effect of boundary layer reactions on the conversion of char-N to NO, N2O and HCN was studied by a coupled experimental/theoretical approach. In the experimental part, the evolution of HCN at conditions of a batch fluidized bed reactor was studied. The results show that the char-N conversion to HCN is very low under normal oxidizing conditions. This explains why it was not detected by early studies of this system. The results also suggest that the release of HCN is related to gases released when the char is oxidized rather than to late devolatilization reactions. The product distribution is modeled using heterogeneous reactions on the char surface coupled to homogeneous reactions in the gas phase. Three cases were analyzed. In Case A, only the heterogeneous production of N2O and NO was considered. Case B considered HCN and NO heterogeneous production. Finally, Case C combined cases A and B by allowing the heterogeneous production of NO, N2O and HCN. Cases A and B predict most of the qualitative trends for the char-N conversion to N2O reported in the literature. However, Case A fails to predict the experimentally observed release of HCN when oxidation around the particle is suppressed. Among the three cases, Case C is the one that closely predicts experimental observables. Finally, the predictions obtained by the model are used to define further experiments, particularly on the evolution of gas concentration in the boundary layer with char burnout, that can be useful in order to obtain more insight in the mechanism of nitrogen oxide formation during char oxidation.
Boundary Layer Reactions, Char-N NO,, N2O and HCN, Fluidized Bed Combustion Conditions
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