Authors: Jing Dong Zhao, Shi Jun Su, Nan Shan Ai, Xiao Fan Zhu
Abstract: A mathematical model for flue gas desulfurization using pyrolusite pulp in jet bubbling reactor (JBR) was described. Firstly, based on the concept of two stages mass balance with chemical reaction, two models were set up, for jet bubbling zone and rising bubble zone, respectively, according to the construction of JBR. The models consist of two coupling differential equations and were solved simultaneously by integral and separation of the variables. Then the SO2 absorption efficiency expression was developed, considering the great discrepancy existing between the gas-side mass transfer coefficients of the jet bubbling zone and gas bubble rising zone. The final expression associates SO2 absorption efficiency with process conditions and JBR structure parameters, which can give some instruction and guidance for the study of reactor operation process. Predicted results from the theoretical model, including effect of pH value of the pulp, flue gas temperature and inlet SO2 concentration of flue gas on SO2 absorption efficiency, were found to be in good agreement with experimental data obtained in a jet bubbling reactor. The model provides a basis for the process scale up and operating guide.
85
Authors: K.G. Mbango Mbida, Cun Yi Song, Guan Qin Chang, Li Dong Zhang, Kun Guo
Abstract: Based on the microscope phase-field model，the evolution of atom morphology, the long range order(lro) parameter and concentration can be gotten, and atomic clustering and ordering during the precipitation process of Ni-Cr-Al alloy could be obtained. The Ni-14at.%Cr-15.5at.%Al alloy is studied and the temperature of precipitation are 973K. It was showed that the ordering of both Al and Cr atoms take place simultaneously during the precipitation process of Ni-Al-Cr alloy, Cr atoms transfer to the boundaries of L12 phases, the domain of rich Cr atoms are formed. At the boundaries of L12 phases, Cr atoms may substitute the Al sublattice, and the D022 phases are formed.
3047
Authors: Hong Yan Zhang, Cheng Wang, Yan Jun Li, Yong Ming Feng
Abstract: Based on the supercharged boiler thermodynamic calculation method and turbocharged set characteristic calculation method, an integrated model used for studying the matching performance was built, and then the matching performance calculation program chart was made. Taking a type of marine supercharged boiler as the research object, the matching performance of supercharged boiler and turbocharged set, which was changed with excess air coefficient, was studied under different loads. The model is proved correct and effective by the comparison of the design value and calculation value. The analysis results can provide a strong technology support to the supercharged boiler set’s optimized design and safety operation, which means theoretical and practical significance
842
Authors: Jing Zhu, Qi Xu, Li Ping Zhang
Abstract: In order to study the flue gas velocity distribution and pressure drop characteristics inside wet desulfurization Tower, experimental study has been carried out. Flow model is built with geometric scale of 1 / 12 , flue gas velocity ratio of 1 / 1 and different gas entrance angle as 12°and 7°. Experiment result shows that Spray liquid droplets made gas more evenly; The evenness of gas velocity distribution is very poor with very low gas load (<35%);The pressure drop in tower increases with increase of sprayer and increases with increase of gas load; The evenness of gas velocity distribution becomes poor and the pressure drop increases when gas inlet angle changes from 12°to 7°.
137
Authors: Fan Wei, Shi Jie Zhang, Yun Han Xiao
Abstract: Open cycle absorption heat transformer (OAHT) is built and the off-design performance is discussed with simulation method. Results show the COP changes little when parameters various. The COP increases and water recovery ratio decreases as the temperature and flow rate of flue gas or of cooling water increase. With the same heat flow ejecting, the system has more stable performance as the humidity of flue gas changes.
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