Cyclone pyrolyzer is a novel type of downer that combines centrifugal force field and double-layer cyclone vortex. Research on transfer behavior is helpful to optimize the pyrolyzer to meet the needs of pyrolysis. In this study, the Computational Particle Fluid Dynamics (CPFD) model is used to analyze the transfer behavior of binary particles, and finds that the swirl and reaction have a synergistic effect. This effect can increase the heating rate of the particles to the range of flash pyrolysis, and its mechanism lies in the flow field structure of the pyrolyzer. Due to the centrifugal force field, the particles gather to the near wall. The rapid swirl, which facilitates intense gas-solid heat transfer, leads to the rapid heating and pyrolysis of biomass particles. As the pyrolysis proceeds, the mass of the biomass particles becomes smaller and they are more easily affected by the gas flow in pyrolyzer. Under the action of gas flow, char particles serve as new heat carrier to form the inner cycle of particles, which strengthens the heating process. The pyrolysis products are discharged from the exhaust port in time with the flow field of the pyrolyzer to achieve separation from the heat carrier and inhibit the occurrence of secondary reactions.

中文翻译：

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旋流和热解反应协同增强旋风热解器中的固-固传热和产物分离

旋风热解器是一种集离心力场和双层旋风涡流为一体的新型下降器。对传递行为的研究有助于优化热解器以满足热解的需要。本研究利用计算粒子流体动力学（CPFD）模型分析二元粒子的传递行为，发现旋流和反应具有协同效应。这种效应可以将颗粒的加热速率提高到闪热解的范围，其机理在于热解器的流场结构。由于离心力场的作用，颗粒聚集到近壁处。快速旋流有利于强烈的气固传热，导致生物质颗粒快速加热和热解。随着热解的进行，生物质颗粒的质量变小，更容易受到热解器中气流的影响。在气流作用下，炭颗粒作为新的热载体，形成颗粒内循环，强化了加热过程。热解产物随热解器流场及时从排气口排出，实现与热载体的分离，抑制副反应的发生。