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电伴热带的安装细节与配件详细设计指导一、管线伴热1、工艺参数:介质维持温度℃环境最低温度℃最高操作温度:a.连续操作温度b.扫线操作温度管材管径mm管道长度m保温材料保温层厚度mm环境:a.室内或室外b.地面或埋地c.防爆或非防爆d.防腐或非防腐电压2、散热量计算Q=q×Δt×K×C×E(w/m)Q-----每米管道的散热量(W/m)q-----管道的散热量(1℃/m时)TW-----维持温度TH-----环境最低温度Δt----TW–THK-----保温材料导热系数C---------管道材料修正系数E-----安全系数例:管径80mm,管道长度100m,管材为碳钢,介质为原油,维持温度50℃,环境最低温度-10℃,保温材料岩棉,保温层厚度25mm,计算每米管道热损失。(1)、计算温差Δt=TW–TH=50-(-10)=60(2)、计算每米管道的散热量K=0.044(查表一“保温材料导热系数”)q=15.26(查表二“每米管道1℃温差时的热损失”)C1=1(查表三“管道材料修正系数”)E=1.2(一般取值为1.2)Q=q×Δt×K×C×E=15.26×60×0.044×1×1.2=48.36W/m即,每米管道热损失为48.36W。保温材料的保温系数、导热系数(10℃时)表一保温材料保温系数(w/m℃)导热系数(w/m℃)玻璃纤维0.036岩棉0.044矿渣棉0.038发泡塑料0.042珍珠岩0.047聚氨脂泡沫塑料0.024聚苯乙烯泡沫塑料0.031硅酸钙0.054复合硅酸盐毡FHP-VB0.0234每米管道1℃温差时的热损失Q表二管径保温层厚度(mm/in)101/2153/4251351-1/2502602-1/275310041/2158.866.735.744.593.943.613.282.953/42010.347.876.565.094.433.943.613.2812512.319.027.555.914.924.434.103.611-1/43214.7710.838.706.735.584.924.593.941-1/24017.0612.3010.017.556.235.584.924.2725019.6914.1111.328.537.056.075.424.762-1/26523.1316.5713.139.687.886.896.075.2538027.5619.3615.2611.169.037.886.895.743-1/29531.0121.8217.0612.3110.018.537.556.23410034.4524.1218.8713.6210.839.198.216.734-1/211537.9026.4120.5114.7711.8110.018.867.22513041.8329.0422.4816.0812.8010.839.527.71615049.2233.9626.2518.5414.6012.3010.668.70820063.1643.1533.1423.1318.2115.0913.1310.661025077.7652.9940.5228.0521.8218.0515.5912.471230091.7062.1847.5832.8125.4321.0017.8814.2714350100.4068.0851.8435.6027.5623.4619.3615.2616400114.277.2758.7340.3631.0125.4321.8217.0618450128.186.4665.7944.9534.4528.2224.1218.8720500141.995.8172.6849.5537.9031.0126.4120.5124600169.6114.286.4658.7344.9537.0831.0124.12管道材料修正系数表三管道材料修正系数碳钢1铜1.05不锈钢0.9塑料0.65阀门及管道附件散热系数(以每米管道散热量为基数)表四名称散热系数法兰0.5蝶阀0.7节流阀0.7球阀0.8球心阀1.2闸阀1.33、确定电伴热带型号、长度(1)、确定型号规格型号最高伴热温度℃最高耐温℃最大使用长度mDBR系列自调温电伴热带7510530DBR系列自调温电伴热带751051000ZBR系列自调温电伴热带1051351000Q总=Q×LQ---每米管道的散热量(W/m)L---管道长度4、电伴热带预留长度法兰:管径的5倍弯头:管径的1.5倍阀门:管径的5倍管架:管径的3~5倍电源接线盒:预留1米中间接线盒:预留米0.5米4、电伴热带总长=电伴热带×安全系数注:安全系数(一般取值1.2)6、电伴热带敷设方法管道单位长度的散热量(热损失)大于电伴热带额定功率时,即比值>1时,按下述方法敷设:a.当比值大于1.5时,采用平行敷设方式,电伴热带长度为管道长度×电伴热带根数;b.当比值1.1~1.5之间时,可采用缠绕敷设方式,缠绕节距见表三,电伴热带长度为管道长度×比值。电伴热带缠绕节距表三管径每米管道散热量(热损失)与电伴热带额定功率比值1.11.21.31.41.51"25017014011010011/4"31021017014013011/2"3502401901601402"43030024020018021/2"5203602902402103"63043035029026031/2"7204903903302904"80056044037033041/2"8906104804003505"9906805504604006"11808106505504808"15201050840710620二、罐体伴热1、散热量计算Q总=q×Δt×K×S×D(W)Q总-----罐体总散热量(W)q-----散热量(W/m2时)TW-----维持温度(℃)TH-----环境最低温度(℃)Δt----温差TW–THS----罐体的表面积(m2)D-------安全系数2、热损失表每平方米罐体1℃温差时的热损失Q表四保温层厚度mm10152535506075100热损失q74.849.737.725.118.614.912.69.3注:导热系数为0.25以上热损失基于10%的设计余量,导热系数为0.253.1电伴热带安装位置3.2缠绕安装3.3管道支架3.4管道三通3.5管道弯头3.6孔板3.7管道吊架3.8管道焊接支架3.9地面以下管道3.10闸阀3.11球阀3.12止回阀3.13外壳泵3.15过滤器3.16水位开关仪3.17压力表3.18管道托架3.19双向电源接线盒名称型号线芯结构单价(元/米)低温基本型DWK2-J7×0.511-16低温防爆型DWK2-P7×0.512-18低温防爆防腐型DWK2-PF47×0.515-30中温基本型ZWK2-J7×0.512-18中温防爆型ZWK2-P7×0.513-20自限温中温防爆防腐型ZWK2-PF47×0.517-35恒功率恒功率并联单相HBL2-J3-2519×0.3213-23恒功率并联单相加强型HBL2(Q)-J3-2519×0.3218-28恒功率并联单相HBL2-J3-3519×0.3214.5-24.5恒功率并联单相加强型HBL2(Q)-J3-3519×0.3220.5-30.5恒功率并联三相HBL3-J3-3019×0.3225-45恒功率并联三相加强型HBL3(Q)-J3-3019×0.3228.5-50.5恒功率串联HCL-J319×0.3245-70参考价格
本文标题:电伴热-设计与安装
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