基于红外测温的双盘式浮顶储油罐散热损失分布规律研究

Research on distribution rule of heat loss for double-deck floating roof oil tank based on infrared thermometer

采用红外热像仪、表面温度计等对双盘式浮顶储油罐的表面温度场进行测试。结果表明:罐顶表面温度呈轴对称分布,径向温度梯度远高于周向,且距离罐中心越远,表面温度越高。油蒸汽挥发导致浮顶和罐壁间的一二次密封处散热损失明显升高,使其成为罐顶表面温度最高的区域。浮舱隔板、桁架和椽子等结构形成了热桥,使局部位置的表面温度升高,增大了罐顶的散热损失。罐壁周向表面温度梯度低于轴向,并且受油温影响较大,在罐壁保温结构的结合部位、局部保温结构破损位置的表面温度较高,散热损失较大。基于表面温度法,结合环境温度和风速测试结果,采用强迫对流换热关联式计算得到储罐不同部位的散热损失。结果表明:对于双盘式浮顶储油罐,罐顶散热损失最大,约占储罐总散热损失的67%,罐壁散热损失约占25%,罐底散热损失约占8%。

The surface temperature field of a large scaled double-deck floating roof oil tank was tested based on the infrared thermometer and surface thermometer.The test results reflect that there is the characteristic of axial symmetrical distribution of the surface temperature filed on the tank roof.The temperature gradient on the radial direction is far larger than that on the circumference.And the far from the center of the roof,the surface temperature is higher.The heat loss on the region of the sealing between the sidewall and roof increases apparently,thus the surface of the sealing region is turned to be the highest temperature region on the roof.The clapboard,the truss and the rafters becomes the heat bridge which increases the surface temperature and the heat loss on the local position of the roof.The surface temperature gradient on the circumference is far smaller than that on the axis direction.And the surface temperature on the sidewall is significantly affected by the oil temperature.The surface temperature and heat loss on the positons between different insulation structures and the positions with damaged insulation structures are higher than that on other positions of the sidewall.Based on the surface temperature method and the data of environment temperature and wind speed,the heat transfer correlations of forced convection are adopted to calculated the heat loss on different positions of the tank.The results show that the heat loss on the tank roof is largest in the tank which has 67% heat loss of the whole tank.The heat loss on the sidewall has the 25% heat loss of the whole tank.The heat loss on the base wall is the lowest with the 8% heat loss of the whole tank.