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为研究氧浓度对燃料粒径的影响,在15 kW循环流化床试验系统和0.15 MW循环流化床试验系统上进行不同氧气浓度、不同燃料、不同粒径的燃烧试验。试验结果表明,燃烧高挥发分的煤时,氧气浓度对燃料的热破碎有较大影响,进而影响燃料粒径。50%左右氧气浓度下时,燃烧高挥发分燃料,平均粒径要比在常规空气下燃烧增加约35%。低挥发分的神木半焦在燃烧过程中热破碎较弱,氧气浓度对热破碎特性影响不大,粒径和空气燃烧条件下无明显差异。
In order to study the effect of oxygen concentration on fuel particle size, different kinds of fuel and different particle sizes were tested on a 15 kW circulating fluidized bed system and a 0.15 MW circulating fluidized bed system. The experimental results show that when burning high volatile coal, the oxygen concentration has a greater impact on the thermal cracking of the fuel, which in turn affects the fuel particle size. At about 50% oxygen concentration, burning a high-volatile fuel resulted in an average particle size increase of about 35% over conventional air combustion. The low volatility of Shenmu semi-coke heat in the combustion process is weak, oxygen concentration has little effect on the thermal characteristics, particle size and air combustion conditions were no significant differences.