蒸汽管道散热量计算模型的修正  

Correction of Computational Model for Heat Dissipation of Steam Pipeline

作　　者：陈斌 张劲松 林小杰 蔡东平 李岚 赵琼[2] CHEN Bin;ZHANG Jinsong;LIN Xiaojie;CAI Dongping;LI Lan;ZHAO Qiong

机构地区：[1]上海漕泾热电有限责任公司,上海201500 [2]浙江大学能源工程学院,浙江杭州310058 [3]常州英集动力科技有限公司,江苏常州213022

出　　处：《煤气与热力》2019年第6期4-9,10041,共7页Gas & Heat

摘　　要：以上海某工业园区蒸汽管网(架空敷设)为研究对象,选取其中一段作为测试管段,进行调研与测试。考虑外保温层与外护管之间出现空气层(由保温棉塌陷及在竖直方向发生下垂导致),以及外护管(镀锌钢板)实际发射率的影响,对蒸汽管道散热量传统计算模型进行修正。以测试管段出口蒸汽实测平均温度(278.5℃)、外护管外表面实测平均温度(38.2℃)作为考核指标,对传统计算模型、修正计算模型的计算结果进行评价。由传统计算模型计算得到的测试管段出口蒸汽温度为286.0℃,与实测值(278.5℃)相比,相对误差为2.7%,在合理的工程误差范围内。由传统计算模型计算得到的外护管外表面平均温度(55.9℃),远高于实测值(38.2℃)。由修正计算模型得到的测试管段出口蒸汽温度为288℃,与实测值相比,相对误差为3.4%,在合理的工程误差范围内。由修正计算模型计算得到的外护管外表面平均温度(35.5℃),与实测值的相对误差为-7.1%,满足工程精度要求,说明修正计算模型的计算结果合理。Taking the steam pipe network (overhead laying) of an industrial park in Shanghai as the research object,one of them is selected as the test segment,and the investigation and test are carried out. Considering the presence of an air layer between the outer insulation layer and the outer predictive pipe (caused by the collapse of the insulation cotton and the sagging in the vertical direction) and the impact of the actual emissivity of the outer predictive pipe (galvanized steel plate),the traditional computational model is modified. The measured average temperature of steam at the outlet of the test pipe section (278.5 ℃) and the measured average temperature of the outer surface of the outer predictive pipe (38.2 ℃) are used as assessment indicators to evaluate the calculation results of the traditional computational model and the modified computational model. The outlet steam temperature of the test pipe section calculated by the traditional computational model is 286.0 ℃,the relative error is 2.7% compared with the measured value (278.5 ℃),which is within a reasonable engineering error range. The average temperature of the outer surface of the outer predictive pipe calculated by the traditional computational model (55.9 ℃) is much higher than the measured value (38.2 ℃).The outlet steam temperature of the test pipe section calculated by the modified computational model is 288 ℃,and the relative error is 3.4% compared with the measured value,which is within a reasonable engineering error range. The average temperature of the outer surface of the outer predictive pipe calculated by the modified computational model is 35.5 ℃,the relative error is -7.1% compared with the measured value,which satisfies the engineering accuracy requirements,indicating that the calculation result of the modified computational model is reasonable.

关 键 词：蒸汽管道 散热量 计算模型 修正 

分 类 号：TU995.3[建筑科学—供热、供燃气、通风及空调工程]