( 1. 中南大學(xué) 能源與動(dòng)力工程學(xué)院， 長(zhǎng)沙 410083;
2. 中國(guó)鋁業(yè)股份有限公司 鄭州輕金屬研究院， 鄭州 450041)
摘 要: 以d4.5m×90m熟料窯的噴射干燥段為研究對(duì)象， 建立了三維傳熱、 傳質(zhì)數(shù)學(xué)模型。 應(yīng)用數(shù)值方法， 研究了不同窯尾壓力和料漿粒徑時(shí)， 窯內(nèi)溫度分布和水蒸氣的濃度分布， 并對(duì)操作參數(shù)和工藝參數(shù)進(jìn)行了優(yōu)化。 結(jié)果表明： 窯尾負(fù)壓和生料漿的平均粒徑對(duì)窯內(nèi)溫度分布和水蒸汽濃度分布有較大影響； 需要提高窯尾溫度和窯尾烘干能力時(shí)可提高負(fù)壓， 反之則減小負(fù)壓； 減小料漿粒徑， 有利于降低窯尾煙氣溫度， 加快物料的升溫過程； 對(duì)直徑為4.5m左右的大型回轉(zhuǎn)窯， 窯尾負(fù)壓可根據(jù)窯況在-200~-300Pa之間調(diào)節(jié)， 生料漿的平均粒徑不宜大于0.1mm。
關(guān)鍵字: 氧化鋁熟料窯； 噴射干燥； 溫度分布； 仿真優(yōu)化
（ 1. School of Energy and Power Engineering,
Central South University, Changsha 410083, China;
2. Institute of Light Metal, China Aluminum Corp,
Zhengzhou 450041, China）
Abstract: A3-D numerical model of spray drier zone in a d4.5m×90m alumina rotary kiln was established. With the spray drier model, the effects of particle size of raw slurry and pressure of kiln end on temperature and water vapor concentration profile in kiln are studied numerically and some parameters are optimized. The results show that the pressure of kiln end and particle diameter of raw slurry affect the performance of spray drier zone obviously. Drying capability can be enhanced by increasing negative pressure of kiln end and decreasing mean particle diameter of raw slurry. According to the work conditions, the pressure of kiln end is supposed to be regulated between -200～-300Pa and the mean particle diameter of raw slurry should be within 0.1mm for large kiln.
Key words: alumina rotary kiln; spray drier; temperature profile; numerical simulation
