(1. 中南大學(xué) 軌道交通安全教育部重點(diǎn)實(shí)驗(yàn)室, 長沙 410075；
2. 中南大學(xué) 機(jī)電工程學(xué)院, 長沙 410083；
3. 中南大學(xué) 能源與動力工程學(xué)院, 長沙 410083)
摘 要: 煙氣、 料床、 窯壁是回轉(zhuǎn)窯傳熱過程的三要素， 在確定這三要素之間傳熱量的基礎(chǔ)上， 建立了回轉(zhuǎn)窯窯壁非穩(wěn)態(tài)傳熱數(shù)學(xué)模型。對中鋁河南分公司2號窯窯壁的非穩(wěn)態(tài)傳熱過程進(jìn)行了數(shù)值計算。 結(jié)果表明： 窯體旋轉(zhuǎn)一周， 燒成帶窯壁內(nèi)表面溫度將在1 232～1 334 ℃變化， 這易導(dǎo)致窯壁熱疲勞破壞； 窯皮越厚， 窯壁的徑向溫度梯度越小， 熱應(yīng)力越低； 將燒成帶窯皮厚度控制在252 mm， 可使燒成帶窯壁外表面溫度維持在200 ℃。
關(guān)鍵字: 回轉(zhuǎn)窯； 窯壁； 窯皮； 優(yōu)化； 傳熱
kiln crust thickness optimization
（1. Key Laboratory of Track Traffic Safety of Ministry of Education,
Central South University, Changsha 410075, China;
2. School of Mechanical and Electrical Engineering,
Central South University, Changsha 410083, China;
3. School of Energy and Power Engineering,
Central South University, Changsha 410083, China）
Abstract: Gas, material bed, kiln wall are the three main factors effecting kiln heat transfer process. On the basis of confirming the heat transfer equation among the three factors, the transient heat transfer model of kiln wall is set up. The numerical calculation of transient heat transfer process of kiln wall of No.2 rotary kiln was carried out in He’nan branch of China aluminum corporation. The results show the inner kiln wall temperature changes between 1 232 ℃ and 1 334 ℃ in sintering zone, which will make lining break down easily. The thicker the kiln crust, the smaller the radial temperature grade of kiln wall, the lower the heat stress. the outer kiln wall temperature keeps at 200 ℃ when kiln crust thickness is controlled at 252 mm in sintering zone.
Key words: rotary kiln; kiln wall; kiln crust; optimization; heat transfer
