罐式炉内石油焦煅烧过程的二维传热传质数学模型

发布时间：2019-04-02 17:08

【摘要】：建立24罐8层火道顺流式罐式炉温度场、残余挥发分浓度场的二维数学模型,模型中包含多孔介质渗流传热模型、固相活塞流模型、异相热解反应动力学模型及等效热流密度边界模型4个部分,并通过该模型研究罐式炉中石油焦热解传质传热过程。结果表明:在给定工况下,石油焦挥发分热解反应主要在二至五层火道高度对应的料罐内进行;在六至八层火道高度对应的料罐内,形成长度约为2.0 m的高温煅烧带(T1423 K),满足石油焦进一步聚合并实现碳结构重排的煅烧温度要求。经生产数据对比验证表明:该模型基本能够反映炉内温度的分布情况,可为罐式炉的温度自动化调控提供一定的理论依据。
[Abstract]:A two-dimensional mathematical model of temperature field and residual volatile concentration field in a 24-tank 8-layer furnace is established. The model includes porous media seepage heat transfer model and solid-phase piston flow model, and the two-dimensional mathematical model includes porous medium seepage heat transfer model and solid-phase piston flow model. The kinetic model of heterogeneous pyrolysis reaction and the boundary model of equivalent heat flux were used to study the pyrolysis and heat transfer process of petroleum coke in tank furnace. The results show that the volatile pyrolysis of petroleum coke is mainly carried out in the tank corresponding to the height of two to five layers of fire channel under a given working condition. A high temperature calcined zone (T1423 K),) with a length of about 2.0m was formed in the tank corresponding to the height of the six to eight layers. The calcination temperature requirement of further polymerization of petroleum coke and realization of rearrangement of carbon structure was met. The comparison of the production data shows that the model can basically reflect the temperature distribution in the furnace and can provide a certain theoretical basis for the automatic control of the temperature of the tank furnace.
【作者单位】：中南大学冶金与环境学院;中南大学难冶有色金属资源高效利用国家工程实验室;
【基金】：国家自然科学基金资助项目(51374253;51574289;61533020) 中南大学“创新驱动计划”资助项目(2015CXS017)~~
【分类号】：TE626.87;TF351

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