(1. 中南大學(xué) 冶金與環(huán)境學(xué)院，長(zhǎng)沙 410083； 2. 江西理工大學(xué) 能源與機(jī)械工程學(xué)院，南昌 330013； 3. 江西理工大學(xué) 冶金與化學(xué)工程學(xué)院，贛州 341000)
摘 要: 針對(duì)高溫下石油焦層揮發(fā)分析出、滲流傳質(zhì)傳熱問(wèn)題，結(jié)合多孔介質(zhì)氣固耦合機(jī)理建立了罐式爐煅燒石油焦過(guò)程的三維數(shù)學(xué)模型。該模型采用雙流體模型描述石油焦煅燒熱解過(guò)程，采用有限速率/渦耗散燃燒模型、標(biāo)準(zhǔn)湍流方程、DO輻射模型描述火道中揮發(fā)分燃燒及熱交換過(guò)程，并利用該模型研究料罐中高溫煅燒帶遷移規(guī)律。結(jié)果表明：在給定工況條件下，隨著單罐單位排料量由75 kg/h增加至115 kg/h，高溫煅燒帶(＞1373 K)由L6區(qū)域下移至消失，且其長(zhǎng)度由2.0 m縮短至0 m；隨著生焦中揮發(fā)分含量由7%增加至15%，高溫煅燒帶由L8區(qū)域上移至L6區(qū)域，且其長(zhǎng)度由0 m增加至3.02 m；隨著空氣過(guò)量系數(shù)由1.05增加至1.60，高溫煅燒帶由L5區(qū)域下移至消失且其長(zhǎng)度由3.02 m縮短至0 m。
關(guān)鍵字: 罐式爐；高溫煅燒帶；遷移；數(shù)值模擬
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China; 2. School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang 330013, China; 3. School of Metallurgical and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China）
Abstract:In view of the problems of heat and mass transfer of high temperature gas seepage in the material layer of vertical shaft calciner, a three-dimensional mathematical model of petroleum coke calcination process in vertical shaft calciner was established in combination with porous media gas-solid coupling effect. In this model, a two-fluid model was used to describe the calcined pyrolysis process of petroleum coke. The finite rate/eddy-dissipation combustion model combined with standard turbulence equations and a discrete ordinates (DO) radiation model were used to describe the volatile combustion in flue and heat transfer process, respectively. The model was used to study the migration patterns of high temperature zone in pot. The results show that the high temperature zone (＞1373 K) moves down from L6 to disappearance and its length gradually reduces from 2.0 m to 0 m when the discharging rate per pot increases from 75 kg/h to 115 kg/h under the given condition, the high temperature zone moves up from L8 to L6 and its length gradually increases from 0 to 3.02 m when the volatile content in green coke increases from 7% to 15% under the given condition, and the high temperature zone moves down from L5 to disappearance and its length gradually reduces from 3.02 m to 0 m when the excess air coefficient increases from 1.05 to 1.60 under the given condition.
Key words: vertical shaft calciner; high temperature zone; migration; numerical simulation
