Aspen Plus simulation of Chemical Looping Combustion of syngas and methane in fluidized beds
Aspen Plus simulation of Chemical Looping Combustion of syngas and methane in fluidized beds
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DOI：
10.1007/s43938-023-00020-x
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发表时间：
2023-02
期刊：
影响因子：
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通讯作者：
Micah Jasper;A. Shahbazi;K. Schimmel;Fanxing Li;Lijun Wang
中科院分区：
文献类型：
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作者：
Micah Jasper;A. Shahbazi;K. Schimmel;Fanxing Li;Lijun Wang
化学循环燃烧（CLC）是一种有效结合发电和二氧化碳捕获的技术。在CLC中，燃料被称为氧载体（OC）的金属氧化物氧化。CLC使用两个反应堆：一个燃料反应堆和一个空气反应堆。燃料反应堆氧化燃料并降低OC。空气反应器使用空气氧化OC，然后OC循环回到燃料反应器。流化床是燃料反应器和空气反应器的典型形式。在本研究中，建立了一个Aspen Plus模型来模拟CLC系统。Aspen Plus最近包含了一个内置FB单元操作模块。据我们所知，没有文献报道使用该FB模块模拟流化床燃烧或气化。在Aspen Plus中对该装置过程进行了研究，采用了基于动力学的模型，并将模拟结果与实验数据和常用的Gibbs平衡模型进行了比较。合成气燃烧的摩尔组成在2%以内，甲烷燃烧的摩尔组成在4%以内，该装置和动力学模型能很好地拟合合成气和甲烷燃烧的实验数据。与文献中其他动力学模型相比，该模型的一个优点是将核心收缩模型的动力学速率方程转化为幂律形式。这允许Aspen Plus使用计算器而不是外部Fortran编译器。这极大地简化了建模过程。给出了所有反应的反应速率方程。对反应动力学进行了敏感性分析。给出了所有的数据、代码和仿真文件。
Chemical Looping Combustion (CLC) is a technology that efficiently combines power generation and CO2capture. In CLC, the fuel is oxidized by a metal oxide called an oxygen carrier (OC). CLC uses two reactors: a fuel reactor and an air reactor. The fuel reactor oxidizes the fuel and reduces the OC. The air reactor oxidizes the OC using air and then the OC is cycled back to the fuel reactor. It is typical for both the fuel and the air reactors to be fluidized beds (FBs). In this research, an Aspen Plus model was developed to simulate a CLC system. Aspen Plus has recently included a built-in FB unit operation module. To our knowledge, no literature has been reported using this FB module for simulating fluidized bed combustion or gasification. This FB unit process was investigated in Aspen Plus and a kinetic based model was used and compared the simulation results to experimental data and the commonly used Gibbs equilibrium model. The FB unit and the kinetic model well fit the experimental data for syngas and methane combustion within 2% of the molar composition of syngas combustion and within 4% for the methane combustion. An advantage of this model over other kinetic models in literature is that the core shrinking model kinetic rate equations have been converted into a power law form. This allows Aspen Plus to use a calculator instead of an external Fortran compiler. This greatly simplifies the modeling process. The reaction rate equations are given for all reactions. A sensitivity analysis of the reaction kinetics was conducted. All data, code, and simulation files are given.