發(fā)布時間：2019-04-26 08:34

【摘要】：LNG空溫式氣化器是氣化站內(nèi)的核心設(shè)備,其管內(nèi)氣化傳熱特性對于設(shè)計與運行優(yōu)化具有重要意義。以實際運行中的空溫式氣化器單根翅片管為原型,運用計算流體力學(xué)軟件Fluent,采用VOF(Volume of Fluid)多相流模型及Lee冷凝相變模型,對LNG管內(nèi)氣化傳熱與流型進行了數(shù)值研究。結(jié)果表明:LNG在空溫式氣化器內(nèi)氣化的主要流型為泡狀流、彈狀流、攪拌狀流及霧狀流,且與Hewitt和Roberts流型圖吻合較好;在LNG管內(nèi)氣化過程中,隨著氣相體積分?jǐn)?shù)的增大,局部傳熱系數(shù)呈先增大后減小的趨勢;管內(nèi)局部傳熱系數(shù)隨著壁面加熱熱流密度的增大而升高,LNG在空溫式氣化器內(nèi)的氣化傳熱以核態(tài)沸騰傳熱為主。
[Abstract]:The LNG air-temperature vaporizer is the core equipment in the gasification station, and its heat transfer characteristics in the tube gasification are of great significance for the design and operation optimization. Based on the single finned tube of air-temperature vaporizer in actual operation, the heat transfer and flow pattern of LNG tube gasification were numerically studied by using VOF (Volume of Fluid) multiphase flow model and Lee condensation phase transition model using computational fluid dynamics software Fluent,. The results show that the main flow patterns of LNG gasification in the air-temperature gasifier are bubble flow, slug flow, agitated flow and fog flow, which are in good agreement with Hewitt and Roberts flow patterns. In the gasification process of LNG tube, the local heat transfer coefficient increases first and then decreases with the increase of the volume fraction of gas phase. The local heat transfer coefficient of the tube increases with the increase of wall heating heat flux, and the gasification heat transfer of LNG in the air-temperature gasifier is dominated by nucleate boiling heat transfer.
【作者單位】： 哈爾濱工業(yè)大學(xué)市政環(huán)境工程學(xué)院;
【分類號】：TE96

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本文編號：2465918