【摘要】：隨著經(jīng)濟(jì)的高速發(fā)展,整個社會對電力的需求越來越大,以煤、天然氣為主要燃料的火電在整個電力生產(chǎn)中仍占據(jù)著較高的比例。能源消耗的快速增長同時也伴隨著對環(huán)境污染的加劇,所以如何提高能源的利用率,降低污染物排放成為當(dāng)今世界最主要的課題之一。為了提高換熱器的傳熱效率,各種類型的鰭片管被廣泛應(yīng)用于電站鍋爐中。如折齒形螺旋鰭片管就被應(yīng)用于燃?xì)?蒸汽聯(lián)合循環(huán)余熱鍋爐中,但是目前還沒有關(guān)于折齒形螺旋鰭片管煙氣側(cè)放熱系數(shù)和阻力系數(shù)統(tǒng)一的標(biāo)準(zhǔn)計(jì)算方法。本研究選擇了10種不同規(guī)格的折齒形螺旋鰭片管,這些試驗(yàn)管或在實(shí)際工程中經(jīng)常使用,或是為了方便研究,結(jié)構(gòu)參數(shù)在常用規(guī)格基礎(chǔ)上適當(dāng)?shù)难由?分別對這10種試驗(yàn)管的煙氣側(cè)放熱特性和阻力特性進(jìn)行試驗(yàn)研究,得出了每一種螺旋鰭片管煙氣側(cè)放熱系數(shù)和阻力系數(shù)的計(jì)算關(guān)聯(lián)式,為余熱鍋爐傳熱系數(shù)和阻力系數(shù)的選取提供依據(jù)。同時根據(jù)計(jì)算關(guān)聯(lián)式,分析了鰭片間距、鰭片高度、橫向節(jié)距和管子外徑等結(jié)構(gòu)尺寸對傳熱特性和阻力特性的影響,為進(jìn)一步優(yōu)化鰭片管的結(jié)構(gòu),提高煙氣側(cè)放熱系數(shù)和減小阻力系數(shù)提供依據(jù)。
[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.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TK172

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