傾斜面から加熱された異なる温度勾配下におけるホットボックスの計算モデル解析

抄録

In the recent years, coke drum application is increasing due to an urgent needs to convert the coke deposit into more valuable products. In this resea rch the performance of hot box attached at shell-to-skirt junction was investigated numerically. Hot box is a triangular cavity in the shell -to-skirt portion, which be added to enhance heat transfer from shell area to skirt area and reduce temperature diff erence between this two areas due to natural convection inside hot box. From the strain gauge and thermocouples data it was found that temperature difference between shell and skirt junction and strain history have the same trend. During preheating stage, maximum temperature with coke drum attachment is decreasing as well as minimum temperature during cooling stage. Because strain is the function of temperature difference and coefficient of thermal expansion, it is believed that the strain will be reduced a s well. From this research it was found that hot box can reduce temperature difference during preheating stage for about 30°C and 20°C during cooling stage respectively.