【正文】 本科畢業(yè)論文 題目 ： 干熄焦爐內(nèi)固 氣流動及傳熱數(shù)值模擬 學(xué) 院 : 材料與冶金學(xué)院 專 業(yè) : 材料成型及控制工程 學(xué) 號 : 202002131028 學(xué)生姓名 : 明廷勇 指導(dǎo)教師 : 常慶明 日 期 : 二〇一五年六月 武漢科技大學(xué)本科畢業(yè)論文 I 摘 要 干熄焦技術(shù)相對傳統(tǒng)的熄焦工藝具有節(jié)能、環(huán)保和提高焦炭質(zhì)量等優(yōu)點，在國內(nèi)外得到了廣泛的應(yīng)用，各大鋼廠都非常重視對干熄焦技術(shù)的研究。隨著干熄焦技術(shù)的不斷發(fā)展，傳統(tǒng)的研究方法 已不能滿足新的工藝要求。 本文以某廠 140t/h 的干熄焦爐為研究對象，建立了干熄焦爐的三維幾何模型，采用多孔介質(zhì)理論建立了干熄焦爐內(nèi)固 氣流動及傳熱的數(shù)學(xué)模型?；?FLUENT 軟件中的多孔介質(zhì)模型，利用 UDS 和 UDF 將 FLUENT 中的單能量方程改寫為雙能量方程，模擬干熄焦爐內(nèi)固 氣流動及傳熱情況，為干熄焦爐提供設(shè)計提供依據(jù)。在此模型基礎(chǔ)上，通過改變氣體入口溫度和速度，觀察氣體出口和焦炭出口溫度的變化情況，分別分析氣體入口風(fēng)溫和入口風(fēng)速對干熄焦生產(chǎn)工藝的影響。 研究發(fā)現(xiàn)，氣體從底部進入干熄焦爐后在斜道和環(huán)形氣 體發(fā)生了偏流，越靠近氣體出口，氣體流速越大；氣體壓降主要發(fā)生在冷卻室，氣壓在斜道和環(huán)形氣道達到最低；在爐內(nèi)同一位置，焦炭溫度恒比氣體溫度高，冷卻室周邊的換熱比中心區(qū)域更充分。氣體入口風(fēng)溫對干熄焦生產(chǎn)工藝影響不大，氣體出口和焦炭出口溫度隨氣體入口風(fēng)速的增大顯著降低。 關(guān)鍵詞： 干熄焦； 多孔介質(zhì)； FLUENT； 數(shù)值模擬 武漢科技大學(xué)本科畢業(yè)論文 II Abstract The Coke Dry Quenching(CDQ) technology have more advantages in energy saving, environmental protection and improving the quality of and coke over the traditional coke quenching process. This technology has been widely used both at home and abroad. And the major steel mills attach great importance to the study of coke dry quenching technology. With the continuous development of dry quenching technology, traditional methods can not meet the requirements of new challenges. In this paper, a threedimensional geometric model of a 140t/h coke dry quenching unit is established and a mathematical model for quenching flow and heat transfer between gas and coke is established by using the theory of porous media. Based on the porous medium model in FLUENT software, the user defined scalars(UDS) and user defined functions(UDF) are utilized to change singleenergy equation into doubleenergy equations, in order to simulate the solidgas flow and heat transfer in dry coke quenching ,which can provide a basis for CDQ design. On the basis of this model, different gasinlet temperature and velocity are given for observing the changes in the gasoutlet and cokeoutlet temperature, to analyze how gasinlet temperature and velocity can affect the CDQ production process . The results show that gas in the chute and ring airway has the drift phenomenon, and the closer to the outlet, the faster the velocity is。 the loss of gas pressure mainly occurred in the cooling chamber, the lowest gas pressure form in the chute and ring airway。 the coke temperature is higher than the gas temperature in any same position of CDQ and the surrounding of the CDQ has a better heat transfer than the center of it. Gasinlet temperature makes little different of coke dry quenching process, while the gasinlet velocity makes much. Key words: CDQ； Porous medium； FLUENT； Numerical simulation 武漢科技大學(xué)本科畢業(yè)論文 III 目 錄 1 緒論 ...................................................................................................................................... 1 干熄焦技術(shù) ................................................................................................................ 1 干熄焦工藝流程 ........................................................................................................ 1 干熄焦爐內(nèi)固 氣流動及傳熱的研究現(xiàn)狀 ............................................................... 3 前蘇聯(lián)的研究 .................................................................................................. 3 日本的研究 ...................................................................................................... 3 國內(nèi)的研究 ...................................................................................................... 4 課題研究的意義與內(nèi)容 ............................................................................................ 4 課題研究的意義 .............................................................................................. 4 課題研究的內(nèi)容 .............................................................................................. 5 2 研究方法 CFD ..................................................................................................................... 6 FLUENT 軟件介紹 .................................................................................................... 6 FLUENT 軟件的二次開發(fā) ........................................................................................ 6 3 干熄焦爐內(nèi)固 氣流動及傳熱的數(shù)學(xué)模型 ....................................................................... 10 幾何模型 .................................................................................................................. 10 基本假設(shè) .................................................................................................................. 10 數(shù)學(xué)模型 .................................................................................................................. 11 邊界條件 .................................................................................................................. 12 4 模擬結(jié)果