Abstract: Under the dual carbon target, circulating fluidized bed (CFB) boiler technology is not only a coal-fired power generation technology with great commercial value and development potential for refining and chemical enterprises, but also brings carbon emission issues to these enterprises. With the development of CFB boiler technology and the increasing capacity of boilers, the problem of poor air-fuel mixing caused by the position and method of feeding and air intake during the operation of large industrial CFB boilers has gradually become prominent. To improve the combustion efficiency and stability of coal-fired CFB boilers and reduce carbon emissions, an Fe-based oxygen carrier was developed based on the principle of oxygen carrier aided combustion (OCAC) technology, and its performance was analyzed on a bubbling bed reactor and a 0.3 MW/h CFB coal-fired reactor. The analysis found that the developed Fe-based oxygen carrier has excellent oxygen absorption and release performance, with a CO conversion rate of more than 88% on the bubbling bed and 52% to 65% on the CFB reactor. The emissions of pollutants such as NOx and SO2 in the flue gas were reduced.

Key words: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">circulating fluidized bed, coal-fired boiler, Fe-based oxygen carrier, auxiliary combustion performance, conversion rate of CO, reaction temperature, reaction time, excess air coefficient

摘要： 双碳目标下，循环流化床（CFB）锅炉技术既是炼化企业极具商业价值和发展潜力的燃煤发电技术，也给炼化企业带来了碳排放问题。随着CFB锅炉技术的发展，锅炉容量日益增大，大型工业CFB锅炉运行过程中由进料、进风的位置和方式带来的空气-燃料混合不良问题逐渐凸显。为提高燃煤CFB锅炉燃烧效率和燃烧稳定性，降低碳排放，基于载氧体辅助燃烧（oxygen carrier aided combustion, OCAC）技术原理，开发了一种Fe基载氧体，并在气泡床反应器和0.3MW/h CFB燃煤反应器上对载氧体性能进行了分析。分析发现，研究开发的Fe基载氧体具有良好的吸氧释氧性能，气泡床CO转化率达到88%以上，CFB反应器CO转化率达到52%～65%，烟气中NOx和SO2等污染物排放有所降低。

关键词: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">循环流化床, 燃煤锅炉, Fe基载氧体, 辅助燃烧性能, CO转化率, 反应温度, 反应时间, 过量空气系数