Abstract A three-dimensional two-fluid model is established for an in-situ gasification chemical looping combustion system to predict its dynamic characteristics and non-uniformity in gas-solid distribution. In the experiment, the fuel reactor (FR) and air reactor (AR) were designed as a high-velocity riser and a novel low-velocity moving bed, respectively. Simulations results show that the predicted pressure distributions agree reasonably well with the experimental data. AR operation did not show any obvious influence on oscillations in the full-loop particle circulation. Each stage of the moving bed AR is found to operate better at relatively lower gas fluidizing number, and the maximum allowable fluidizing number is estimated to be around 0.7. With increase in fluidizing number in AR, gas concentration, gas velocity and solid velocity uniformity index increase, while solid concentration uniformity index decreases. Compared to the parallel arrangement of gas distributors and exhausts, gas concentration and velocity uniformity indices are smaller except for the near-exhaust section under the vertical arrangement of gas distributors and exhausts. Increase in first-stage or second-stage AR outlet pressure has an opposite influence on gas leakage in both the first-stage AR and second-stage AR.

中文翻译：

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包含两级逆流移动床空气反应器的 3D 全回路 iG-CLC 系统的数值模拟

摘要 建立了原位气化化学循环燃烧系统的三维二维模型，预测其气固分布的动态特性和不均匀性。在实验中，燃料反应器（FR）和空气反应器（AR）分别设计为高速提升管和新型低速移动床。模拟结果表明，预测的压力分布与实验数据相当吻合。AR 操作对全环粒子循环中的振荡没有表现出任何明显的影响。发现移动床AR的每一级在相对较低的气体流化数下运行得更好，并且最大允许流化数估计在0.7左右。随着 AR 中流化数的增加，气体浓度，气体流速和固体流速均匀性指数增加，而固体浓度均匀性指数降低。与配气与排气平行排列相比，配气与排气垂直排列下，除近排气段外，气体浓度和速度均匀性指标较小。第一级或第二级 AR 出口压力的增加对第一级 AR 和第二级 AR 中的气体泄漏具有相反的影响。