2015 volumne 36卷 Issue 04
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JIANG Jian-dong1 ,ZHANG Hao-jie1 ,WANG Jing2
Abstract: To further improve the accuracy of power load forecasting,on the basis of the analysis of affectingfactors of power load, a combination prediction model based on HHT is proposed. This model uses EMD algo-rithm to decompose the original load sequence. Thus, a stationary sequence of different frequencies,which ismore predictable than the original load sequence,can be obtained. Based on the components of different fre-quencies,according to the characteristics of the different frequency of subsequence ,the RBF neural network ,BP neural network and time series model are selected to forecast while considering the influence of temperatureon the load. Then,a new combined model can be achieved. The experiment shows that the proposed modelcan effectively improve the accuracy of load forecasting.
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WANG Wei-shu1, SHAGN GUAN Shan-shan1,LU Tong1 ,YANG Zhi-feng2 ,ZHENG Chun-xiong1,CHEN Gang1
Abstract: Based on FLUENT6.3 software,the simulation and analysis were applied to the optimization designof splitters in Selective Catalytic Reduction ( SCR ) denitrification system for a 600MW coal-fired boiler. Theresults show that because of variable cross-section and deflection in flue,flow field in the system appears non-uniform severely when there is no splitters. The velocity difference on two sides of the section at AlG lowerreaches is up to 15 m/s,the velocity deviations in the reactor inlet is 31.25% , and the flow field is poor intail flue,which affects the operation of downstream equipments.Reasonable splitters can improve flow field influe effectively. After equipping the transition pipe of the inlet with two group of longitudinal splitters, the ve-locity deviations in section at AIG lower reaches is reduced to 15% and in the reactor inlet is reduced to 13% .Splitters in elbow is equipped with an extension for guiding,which have a good effect on homogenization of thedownstream flow field.
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WAN Ya-zhen,LIU Ya-nan,CHEN Di
Abstract: PTA supported catalyst was prepared by dip roasting method for the synthesis of 2-(4’ -ethyl benzoyl) benzoic acid (BEA) from phthalic anhydride and ethyl benzene as raw materials and chlorobenzene as solvent.The experimental results showed that when the load of PTA was 30%(mass fraction) and the roasting temperature was 300℃, the catalytic activity of PTA was more than doubled with SiO2 as the carrier.The effects of XRD on loading capacity and NH3-TPD on calcination temperature were analyzed. Ft-ir and BET were used to characterize PTA/SiO2 catalysts.The reuse performance of PTA/SiO2 catalyst was investigated, and the results showed that the original catalytic activity of PTA/SiO2 was still maintained after repeated use.
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Copyright © 2023 Editorial Board of Journal of Zhengzhou University (Engineering Science)