方管保温优化设计研究
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摘要
采取有限差分法和焓降法混合编程求解方管保温三维温度场,研究了方管保温复合传热机理,建立了优化设计模型,分析了最佳内、外层经济保温层厚度。研究表明:数值模拟与实测结果两者吻合良好;通过对双层保温的总费用分析,保温材料价格及性能、管内介质流速和热价是最佳内外经济保温层厚度的三大主要影响因素;在满足各约束条件下,内外保温层材料搭配应考虑适度控制高价位的保温层厚度,增厚低价位的保温层厚度,达到既可节能又减少投资和运行成本。此成果有助设计人员合理地选择保温材料并确定其最佳经济厚度,提高设计效率和设计质量,并已应用于某炉窑公司保温工程,得到了充分验证和取得良好的经济效益。
Based on the finite difference and the enthalpy drop method,a complete three-dimensional temperature field of square-pipe insulation is built by hybrid programming,discuss the principle of compound heat transfer in square-pipeline insulation,establish the numeric module of optimization,analyze the optimally internal and external thickness of square-pipe insulation.Studies show the software calculation agree well with the test;by analyzing the total heat insulating expense of double insulating layer,three key parameters are the price and performance of insulation material,the flow rate of medium inside the pipe,the heat price in the optimally internal and external thickness of insulation;under the control of the constrained conditions,collocation of internal and external insulation material should control the insulation thickness of high price,thicken the insulation thickness of low price,so that saving energy and reducing investment and operation cost.The research are helpful to the designers to select insulating materials and determine their economical thickness,which can increase their design efficiency and quality;has been applied to temperature holding engineering of some furnace & kiln Co.Ltd.,has been sufficiently validated and achieved economic benefit.
Based on the finite difference and the enthalpy drop method,a complete three-dimensional temperature field of square-pipe insulation is built by hybrid programming,discuss the principle of compound heat transfer in square-pipeline insulation,establish the numeric module of optimization,analyze the optimally internal and external thickness of square-pipe insulation.Studies show the software calculation agree well with the test;by analyzing the total heat insulating expense of double insulating layer,three key parameters are the price and performance of insulation material,the flow rate of medium inside the pipe,the heat price in the optimally internal and external thickness of insulation;under the control of the constrained conditions,collocation of internal and external insulation material should control the insulation thickness of high price,thicken the insulation thickness of low price,so that saving energy and reducing investment and operation cost.The research are helpful to the designers to select insulating materials and determine their economical thickness,which can increase their design efficiency and quality;has been applied to temperature holding engineering of some furnace & kiln Co.Ltd.,has been sufficiently validated and achieved economic benefit.
引文
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[2]谷永锋,王晓聆.高温炉烟管道保温结构的设计及应用研究[J].黑龙江电力,2009,31(3):193-196.
[3]AHMET Z S,MUAMMER K.Maintaining Uniform Surface Temperature Along Pipes by Insulation[J].Energy,2005,30:637-647.
[4]陈江凡,邹华生.大型液化气低温储罐结构及其保冷设计[J].油气储运,2006,25(7):11-15.
[5]KAYNAKLI O.A Study on Residential Heating Energy Requi-rement and Optimum Insulation Thickness[J].Renewable En-ergy,2008,33:1164-1172.
[6]WU S Y,LI Y R.Exergy-economic Criteria for Evaluating Heat Exchanger Performance[J].Journal of Thermal Science,2001,10(3):81-84.
[7]GUO B Y,SONG S H,JACOB C.Pipeline Insulation[J].Offshore Pipelines,2005,23:107-117.
[8]那威,邹平华.钢外护管真空复合预制直埋管道真空层热力分析[J].暖通空调,2006,36(2):1-5.
[9]邹平华,贾晶,李艳杰,等.对《设备及管道保温技术通则》中允许最大散热损失值的探讨[J].暖通空调,2007,37(4):41-45.
[10]李业发.辐射屏法输热管网隔热保温的参数确定方法及计算结果[J].热能动力工程,2001,16(2):199-201.
[11]苏高辉,杨自春.管道多层隔热系统的传热分析及优化设计[J].武汉理工大学学报,2011,33(8):58-61.
[12]李春成,谢禹钧,李世武,等.工业管道保温结构的优化设计及节能分析[J].辽宁石油化工大学学报,2006,26(2):52-55.
[13]苏金明,刘宏,刘波.Matlab高级编程[M].北京:电子工业出版社,2008:189-260.
[14]中华人民共和国化学工业部.GB50264-97工业设备及管道绝热工程设计规范[S].北京:中国电力出版社,1997.