CAJ | 학술논문

建立了描述双流化床化学链燃烧反应器内气固两相流动的数学模型，采用计算流体动力学方法，模拟考察了提升管和鼓泡床相耦合的双流化床内不同单元之间气体泄漏产生原因和影响因素。化学链燃烧系统压力平衡的分析结果表明，反应器间的气体泄漏主要发生在溢流装置和鼓泡床之间；增大溢流装置表观气速，气体泄漏增大，而增大提升管或鼓泡床表观气速时，气体泄漏会随之减小；化学链燃烧系统内颗粒总藏量增加时，气体泄漏会减小；颗粒粒径减小后反应器之间气体泄漏降低。其研究结果对其他循环流化床反应器的设计与工程放大也有一定的借鉴作用。
건립료묘술쌍류화상화학련연소반응기내기고량상류동적수학모형，채용계산류체동역학방법，모의고찰료제승관화고포상상우합적쌍류화상내불동단원지간기체설루산생원인화영향인소。화학련연소계통압력평형적분석결과표명，반응기간적기체설루주요발생재일류장치화고포상지간；증대일류장치표관기속，기체설루증대，이증대제승관혹고포상표관기속시，기체설루회수지감소；화학련연소계통내과립총장량증가시，기체설루회감소；과립립경감소후반응기지간기체설루강저。기연구결과대기타순배류화상반응기적설계여공정방대야유일정적차감작용。
Based on the Eulerian-Eulerian model with the kinetic theory of granular flow, a gas-solid two-phase flow model is established to investigate the gas leakage in a dual fluidized bed for chemical looping combustion (CLC) using computation fluid dynamics (CFD). This CLC system mainly consists of a riser as air reactor and a bubbling bed as fuel reactor, which are connected by a cyclone and a fluidized pot-seal. Particles and gas from the riser are separated by the cyclone. The particles fall down into a bubbling bed, and then are transported back into the riser via the pot-seal. Simulation results show that the pressure balance of the system is a key issue for the gas leakage. The pressure difference between the bubbling bed and cyclone or pot-seal should be as small as possible. The gas leakage is mainly from the pot-seal into the bubbling bed at normal operating conditions. With increasing the gas velocity in the riser or the bubbling bed, the gas leakage decreases from the pot-seal into the bubbling bed, whilst the increase in the gas velocity of the pot-seal results in more gas leakage. In addition, the gas leakage decreases with a decrease in the particle size or an increase in the solid inventory.