The heat loss and its,distribution are of great importance for the calculation and simulation of COREX process. Based on Baosteel COREX process, a method was applied to measure the heat loss of the furnace shell, the ...The heat loss and its,distribution are of great importance for the calculation and simulation of COREX process. Based on Baosteel COREX process, a method was applied to measure the heat loss of the furnace shell, the accessory equipments and the cooling water system. Then, a static model was established based on the measured heat loss of COREX process. The results showed that the main heat loss of furnace shells took place at the dome of the COREX melter-gasifier and the reducing gas entrance position of the shaft furnace while the main heat loss caused by cooling water occurred at the tap hole area. And the heat loss caused by cooling water accounts for about 85% of the total heat loss in COREX process. The measured total heat loss for producing every 1 t hot metal was 542. 164 MJ, which accounted for about 92 % of the theoretical total heat loss.展开更多
针对钢索金属截面积损失(loss of metallic area,LMA)检测精度不足的问题,提出了一种脉冲励磁下的LMA检测方法。基于主磁通量原理构建检测理论模型,通过线性拟合感应电压信号的数值积分与LMA值进行模型标定,并以最大化决定系数(R^(2))...针对钢索金属截面积损失(loss of metallic area,LMA)检测精度不足的问题,提出了一种脉冲励磁下的LMA检测方法。基于主磁通量原理构建检测理论模型,通过线性拟合感应电压信号的数值积分与LMA值进行模型标定,并以最大化决定系数(R^(2))为目标优化积分阈值。搭建钢绞线LMA检测实验平台,获取不同LMA下的感应电压信号,对所提方法进行测试、分析。结果表明:在最优积分阈值下,LMA与积分电压呈高度线性关系(R^(2)=0.9993),检测误差均值仅为1.6514%,显著优于现有方法,验证了本方法在提高钢索LMA检测精度方面的可行性。展开更多
The main aim in this research is comparison the parameters of some storm events in the watershed using two loss models in Unit hydrograph method by HEC-HMS. SCS Curve Number and Green-Ampt methods by developing loss m...The main aim in this research is comparison the parameters of some storm events in the watershed using two loss models in Unit hydrograph method by HEC-HMS. SCS Curve Number and Green-Ampt methods by developing loss model as a major component in runoff and flood modeling. The study is conducted in the Kuala Lumpurwatershed with674 km2 area located in Klang basin inMalaysia. The catchment delineation is generated for the Klang watershed to get sub-watershed parameters by using HEC-GeoHMS extension in ARCGIS. Then all the necessary parameters are assigned to the models applied in this study to run the runoff and flood model. The results showed that there was no significant difference between the SCS-CN and Green-Ampt loss method applied in the Klang watershed. Estimated direct runoff and Peak discharge (r = 0.98) indicates a statistically positive correlations between the results of the study. And also it has been attempted to use objective functions in HEC-HMS (percent error peaks and percent error volume) to classify the methods. The selection of best method is on the base of considering least difference between the results of simulation to observed events in hydrographs so that it can address which model is suit for runoff-flood simulation in Klang watershed. Results showed that SCS CN and Green-Ampt methods, in three events by fitting with percent error in peak and percent error in volume had no significant difference.展开更多
基金Item Sponsored by National Natural Science Foundation of China(U1260202)Specialized Research Fund for Doctoral Program of Higher Education of China(20120006110002)
文摘The heat loss and its,distribution are of great importance for the calculation and simulation of COREX process. Based on Baosteel COREX process, a method was applied to measure the heat loss of the furnace shell, the accessory equipments and the cooling water system. Then, a static model was established based on the measured heat loss of COREX process. The results showed that the main heat loss of furnace shells took place at the dome of the COREX melter-gasifier and the reducing gas entrance position of the shaft furnace while the main heat loss caused by cooling water occurred at the tap hole area. And the heat loss caused by cooling water accounts for about 85% of the total heat loss in COREX process. The measured total heat loss for producing every 1 t hot metal was 542. 164 MJ, which accounted for about 92 % of the theoretical total heat loss.
文摘针对钢索金属截面积损失(loss of metallic area,LMA)检测精度不足的问题,提出了一种脉冲励磁下的LMA检测方法。基于主磁通量原理构建检测理论模型,通过线性拟合感应电压信号的数值积分与LMA值进行模型标定,并以最大化决定系数(R^(2))为目标优化积分阈值。搭建钢绞线LMA检测实验平台,获取不同LMA下的感应电压信号,对所提方法进行测试、分析。结果表明:在最优积分阈值下,LMA与积分电压呈高度线性关系(R^(2)=0.9993),检测误差均值仅为1.6514%,显著优于现有方法,验证了本方法在提高钢索LMA检测精度方面的可行性。
文摘The main aim in this research is comparison the parameters of some storm events in the watershed using two loss models in Unit hydrograph method by HEC-HMS. SCS Curve Number and Green-Ampt methods by developing loss model as a major component in runoff and flood modeling. The study is conducted in the Kuala Lumpurwatershed with674 km2 area located in Klang basin inMalaysia. The catchment delineation is generated for the Klang watershed to get sub-watershed parameters by using HEC-GeoHMS extension in ARCGIS. Then all the necessary parameters are assigned to the models applied in this study to run the runoff and flood model. The results showed that there was no significant difference between the SCS-CN and Green-Ampt loss method applied in the Klang watershed. Estimated direct runoff and Peak discharge (r = 0.98) indicates a statistically positive correlations between the results of the study. And also it has been attempted to use objective functions in HEC-HMS (percent error peaks and percent error volume) to classify the methods. The selection of best method is on the base of considering least difference between the results of simulation to observed events in hydrographs so that it can address which model is suit for runoff-flood simulation in Klang watershed. Results showed that SCS CN and Green-Ampt methods, in three events by fitting with percent error in peak and percent error in volume had no significant difference.
