Abstract The integrated bubbling-transport fluidized bed can realize both sufficient gas-solid contact time and adjustable solid circulation rate. This paper performed a full-loop simulation of continuous CO2 capture process in a dual fluidized-bed system, using the bubbling-transport bed as the adsorber and K2CO3/γ-Al2O3 as the sorbents. Two-dimensional Eulerian-Eulerian models coupling with reaction kinetics were applied in the simulation. The results show that the adsorption reaction mainly takes place in the bubbling section of the adsorber, but rarely in the central riser and transport section. The increase of the sorbent circulation rate and the water vapor concentration in flue gas benefit the CO2 capture performance, and the latter is more preferable. Together with the sorbents, part of flue gas is entrained from the bubbling section to the central riser, causing an apparent fluctuation of sorbent circulation, as well as a low global CO2 capture efficiency due to the insufficient gas-sorbent contact.

中文翻译：

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新型双流化床系统中二氧化碳捕集过程的二维全回路模拟

摘要 鼓泡-输送一体化流化床既能实现足够的气固接触时间，又能实现可调节的固体循环速率。本文以鼓泡传输床为吸附剂，以K2CO3/γ-Al2O3为吸附剂，对双流化床系统中连续CO2捕集过程进行了全回路模拟。在模拟中应用了与反应动力学耦合的二维欧拉-欧拉模型。结果表明，吸附反应主要发生在吸附器的鼓泡段，很少发生在中央提升管和输送段。吸附剂循环速率和烟气中水蒸气浓度的增加有利于CO2捕集性能，后者更优选。与吸附剂一起，