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Aspen Plus simulations of fluidised beds for chemical looping combustion

机译：用于化学循环燃烧的流化床的Aspen Plus模拟

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Chemical Looping Combustion (CLC) is a technology able to generate energy whilst managing CO_2 emissions. A system composed by two interconnected fluidised beds is often used in CLC: the two fluidised beds are employed for carrying out the oxidation and reduction reactions of the metal oxide employed as oxygen carrier. In this work, a model to implement fluidised bed systems in Aspen Plus is presented. Depending on the hydrodynamic regimes, two different models are considered: one of the two fluidised beds, called the fuel reactor, is modelled according to the two-phase theory (i.e. emulsion and bubble phase) whilst the other bed, called the air reactor, is assumed to operate in the fast fluidisa-tion regime. Kinetic equations for heterogeneous gas/solid reactions are also considered in the model. Simulation tests for each fluidised bed are carried out, and comparisons are made with experimental data from the literature. A comparison with the largely used Gibbs reactor model is carried out showing the advantages of using the models developed here. In addition, the net heat duty of the whole process is calculated and the role of the main variables that affect the process is investigated.
机译：化学循环燃烧（CLC）是一种能够在管理CO_2排放的同时产生能量的技术。在CLC中经常使用由两个相互连接的流化床组成的系统：两个流化床用于进行用作氧载体的金属氧化物的氧化和还原反应。在这项工作中，提出了在Aspen Plus中实施流化床系统的模型。根据流体力学状况，考虑两种不同的模型：两个流化床中的一个，称为燃料反应器，是根据两相理论（即乳液相和气泡相）建模的，而另一个床，称为空气反应器，假定在快速流化状态下运行。模型中还考虑了非均相气/固反应的动力学方程。进行每个流化床的模拟测试，并与文献中的实验数据进行比较。与广泛使用的吉布斯反应堆模型进行了比较，显示了使用此处开发的模型的优势。此外，还计算了整个过程的净热负荷，并研究了影响过程的主要变量的作用。

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