罐式炉内石油焦层高温煅烧带迁移数值模拟  

Simulation of migration of high temperature zone of petroleum coke layer in vertical shaft calciner

作　　者：李静 黄金堤 肖劲 李明周 LI Jing;HUANG Jin-di;XIAO Jin;LI Ming-zhou(School of Metallurgy and Environment,Central South University,Changsha 410083,China;School of Energy and Mechanical Engineering,Jiangxi University of Science and Technology,Nanchang 330013,China;School of Metallurgical and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]中南大学冶金与环境学院,长沙410083 [2]江西理工大学能源与机械工程学院,南昌330013 [3]江西理工大学冶金与化学工程学院,赣州341000

出　　处：《中国有色金属学报》2018年第6期1216-1224,共9页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51374253);江西省教育厅科学技术研究项目(GJJ160664;GJJ160635)~~

摘　　要：针对高温下石油焦层挥发分析出、渗流传质传热问题,结合多孔介质气固耦合机理建立了罐式炉煅烧石油焦过程的三维数学模型。该模型采用双流体模型描述石油焦煅烧热解过程,采用有限速率/涡耗散燃烧模型、标准湍流方程、DO辐射模型描述火道中挥发分燃烧及热交换过程,并利用该模型研究料罐中高温煅烧带迁移规律。结果表明:在给定工况条件下,随着单罐单位排料量由75 kg/h增加至115 kg/h,高温煅烧带(>1373 K)由L6区域下移至消失,且其长度由2.0 m缩短至0 m;随着生焦中挥发分含量由7%增加至15%,高温煅烧带由L8区域上移至L6区域,且其长度由0 m增加至3.02 m;随着空气过量系数由1.05增加至1.60,高温煅烧带由L5区域下移至消失且其长度由3.02 m缩短至0 m。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.

关 键 词：罐式炉 高温煅烧带 迁移 数值模拟 

分 类 号：TF806.1[冶金工程—有色金属冶金]