CAJ | 학술논문

从3个方面介绍以煤为燃料的化学链燃烧的研究进展。在载氧体方面，研究载氧体的气固反应特性，采用表面光滑的Fe多晶片作为反应物，借助扫描电镜观测固体产物，剥离了孔隙结构的影响，解决固体产物微观形貌难以直接观察的问题；建立了基于分子尺度固体产物成核与生长的速率方程，从微观分子尺度来描述宏观的动力学行为；建立活性成分与惰性载体间相互作用力模型；提出通过引入外来离子提高天然钛铁矿载氧体反应活性的方法。在煤与载氧体相互作用方面，考虑了挥发分、煤灰对载氧体的影响；采用催化气化使气化速率与还原速率相匹配；煤的破碎、磨耗及分层会导致燃料反应器内气体的不完全转化。在反应器方面，建立了双循环回路的三流化床实验台，实现了140h稳定热态运行；并提出采用下行床、低温化学链燃烧和直接化学链燃烧的概念来转化未反应气体。
종3개방면개소이매위연료적화학련연소적연구진전。재재양체방면，연구재양체적기고반응특성，채용표면광활적Fe다정편작위반응물，차조소묘전경관측고체산물，박리료공극결구적영향，해결고체산물미관형모난이직접관찰적문제；건립료기우분자척도고체산물성핵여생장적속솔방정，종미관분자척도래묘술굉관적동역학행위；건립활성성분여타성재체간상호작용력모형；제출통과인입외래리자제고천연태철광재양체반응활성적방법。재매여재양체상호작용방면，고필료휘발분、매회대재양체적영향；채용최화기화사기화속솔여환원속솔상필배；매적파쇄、마모급분층회도치연료반응기내기체적불완전전화。재반응기방면，건립료쌍순배회로적삼류화상실험태，실현료140h은정열태운행；병제출채용하행상、저온화학련연소화직접화학련연소적개념래전화미반응기체。
Coal-fueled chemical looping combustion was studied from three aspects. In the aspect of oxygen carriers, the gas-solid reaction of carriers was studied. Multi-crystal Fe with smooth surface was used as the reactant to eliminate the effect of pore structure. The morphology of solid products was observed under a scanning electron microscope. The problem of directly observing the product morphology was solved. A rate equation theory was developed to describe the macroscopic kinetics based on the nucleation and growth of solid product from molecular level. A model of interaction force between active components and inert supports was developed. The method of improving the reactivity of natural limonite by introducing foreign ions was proposed. In the aspect of interaction between coal and oxygen carriers, the effect of volatiles and ash on oxygen carriers was addressed. The match of char gasification rate and reduction rate can be achieved through catalytic gasification. Fragmentation, attrition, and segregation of coal particles caused the incomplete gas conversion in the fuel reactor. In the reactor aspect, a three fluidized beds reactor with dual circulating loops was built. A steady operation of 140h in hot mode was accomplished. The concepts of downer reactor, low temperature CLC, and direct CLC were proposed for converting the un-reacted gases.