折齿形螺旋鳍片管传热特性和阻力特性试验研究
发布时间：2018-11-08 07:53
【摘要】：随着经济的高速发展,整个社会对电力的需求越来越大,以煤、天然气为主要燃料的火电在整个电力生产中仍占据着较高的比例。能源消耗的快速增长同时也伴随着对环境污染的加剧,所以如何提高能源的利用率,降低污染物排放成为当今世界最主要的课题之一。为了提高换热器的传热效率,各种类型的鳍片管被广泛应用于电站锅炉中。如折齿形螺旋鳍片管就被应用于燃气-蒸汽联合循环余热锅炉中,但是目前还没有关于折齿形螺旋鳍片管烟气侧放热系数和阻力系数统一的标准计算方法。本研究选择了10种不同规格的折齿形螺旋鳍片管,这些试验管或在实际工程中经常使用,或是为了方便研究,结构参数在常用规格基础上适当的延伸,分别对这10种试验管的烟气侧放热特性和阻力特性进行试验研究,得出了每一种螺旋鳍片管烟气侧放热系数和阻力系数的计算关联式,为余热锅炉传热系数和阻力系数的选取提供依据。同时根据计算关联式,分析了鳍片间距、鳍片高度、横向节距和管子外径等结构尺寸对传热特性和阻力特性的影响,为进一步优化鳍片管的结构,提高烟气侧放热系数和减小阻力系数提供依据。
[Abstract]:With the rapid development of economy, the whole society needs more and more electricity, and the coal and natural gas as the main fuel still occupy a high proportion in the whole electric power production. The rapid growth of energy consumption is accompanied by the aggravation of environmental pollution, so how to improve the efficiency of energy utilization and reduce the emission of pollutants has become one of the most important issues in the world. In order to improve the heat transfer efficiency of heat exchangers, various kinds of finned tubes are widely used in power plant boilers. For example, the helical fin tube is applied to the waste heat boiler of gas-steam combined cycle, but there is no standard calculation method for the uniform heat release coefficient and resistance coefficient of the flue gas side of the helical fin tube. In this study, 10 kinds of zigzag helical fin tubes with different specifications are selected. These test tubes are often used in practical projects, or for the convenience of study, the structural parameters are properly extended on the basis of common specifications. The exothermic characteristics and resistance characteristics of the smoke side of the 10 kinds of test tubes were studied respectively, and the correlation formulas of the heat release coefficient and the resistance coefficient of the smoke side of each spiral fin tube were obtained. It provides the basis for the selection of heat transfer coefficient and resistance coefficient of waste heat boiler. At the same time, according to the correlation formula, the effects of fin spacing, fin height, transverse pitch and tube outer diameter on the heat transfer and resistance characteristics are analyzed, so as to optimize the finned tube structure. It provides the basis for increasing the heat release coefficient and reducing the resistance coefficient of the flue gas side.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK172
本文编号：2317853
[Abstract]:With the rapid development of economy, the whole society needs more and more electricity, and the coal and natural gas as the main fuel still occupy a high proportion in the whole electric power production. The rapid growth of energy consumption is accompanied by the aggravation of environmental pollution, so how to improve the efficiency of energy utilization and reduce the emission of pollutants has become one of the most important issues in the world. In order to improve the heat transfer efficiency of heat exchangers, various kinds of finned tubes are widely used in power plant boilers. For example, the helical fin tube is applied to the waste heat boiler of gas-steam combined cycle, but there is no standard calculation method for the uniform heat release coefficient and resistance coefficient of the flue gas side of the helical fin tube. In this study, 10 kinds of zigzag helical fin tubes with different specifications are selected. These test tubes are often used in practical projects, or for the convenience of study, the structural parameters are properly extended on the basis of common specifications. The exothermic characteristics and resistance characteristics of the smoke side of the 10 kinds of test tubes were studied respectively, and the correlation formulas of the heat release coefficient and the resistance coefficient of the smoke side of each spiral fin tube were obtained. It provides the basis for the selection of heat transfer coefficient and resistance coefficient of waste heat boiler. At the same time, according to the correlation formula, the effects of fin spacing, fin height, transverse pitch and tube outer diameter on the heat transfer and resistance characteristics are analyzed, so as to optimize the finned tube structure. It provides the basis for increasing the heat release coefficient and reducing the resistance coefficient of the flue gas side.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK172
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