关键词: 化学链燃烧, 串行流化床, 气体串混, CO₂分离

Abstract: Chemical looping combustion（CLC）is an efficient technology with inherent separation of greenhouse gas CO₂.The gas leakage between reactors is an important factor for CLC. Gas leakage was experimentally investigated in an interconnected fluidized bed reactor. There were several possible routes for gas leakage in the reactors: from air reactor (AR)to fuel reactor (FR)and from FR to AR, from FR to cyclone (CL),from loopseal (LPS)to AR and from LPS to FR. The leakage was measured according to different fluidization numbers of AR, FR and LPS. The experimental results demonstrated that the gas leakage between AR and FR could be effectively prevented by adding a LPS between them. A little gas leakage from FR to cyclone was through the downcomer, and the ratio of gas leakage was about 2%, making carbon capture efficiency as high as 98%.The fluidizing velocity of FR had much less effect on the distribution of gas leakage in the two reactors. Moreover, the influence of gas leakage could be prevented by using steam as fluidizing agent.

Key words: chemical looping combustion, interconnected fluidized bed, gas leakage, CO₂ separation