In chemical looping combustion, solid metal oxide particles are utilized to transport oxygen from the air reactor to the fuel reactor. As fuel and air are never mixed, the energy penalty typically associated with gas separation in first-generation carbon capture and storage technologies can be avoided. To be considered as oxygen carrier for this process, a material should be reactive at relevant conditions, environmentally friendly, non-toxic, mechanically durable and have potential to be produced at low cost in large scale. Combined oxides of manganese and silicon have previously shown promise to meet these requirements.

In this study, a spray-dried oxygen carrier based on a combined oxide of manganese, silicon and titanium was examined with respect to its performance in continuous chemical looping combustion of solid fuels. The experiments were carried out in a 10 kW chemical looping pilot unit which uses interconnected fluidized beds for oxygen carrier cycling. Prior to these experiments, the attrition rate was determined in a jet-cup rig. As the particles were comparably small and light, elutriation from the air reactor was high.

The fuels used during a total experimental duration of 32 h were wood char, devolatilized hard coal, pet coke and lignite. In addition to varying fuels, the influence of fuel power, solids circulation and fuel reactor temperature were investigated.

Gas conversion performance correlated clearly with the volatile content of the fuels, peaking at 97.8% for wood char and 94.6% for pet coke, which is the highest value ever reached for this particular fuel in this unit. Higher temperatures and solids circulation rates increased gas conversion. No decrease in performance over time, in particular no loss of reactivity due to sulphur accumulation, could be detected. The oxygen carrier released gaseous oxygen at relevant conditions. The particles were easily fluidized and fines production was low, suggesting a sufficient lifetime for the purpose.

在化学循环燃烧中，固体金属氧化物颗粒被用来将氧气从空气反应器输送到燃料反应器。由于从未将燃料和空气混合在一起，因此可以避免在第一代碳捕获和存储技术中通常与气体分离相关的能量损失。被认为是该方法的氧气载体，材料应在相关条件下具有反应性，对环境无害，无毒，机械耐用，并具有以低成本大规模生产的潜力。锰和硅的混合氧化物先前已显示出可以满足这些要求的希望。

在这项研究中，研究了基于锰，硅和钛的混合氧化物的喷雾干燥氧气载体在固体燃料连续化学循环燃烧中的性能。实验是在一个10 kW的化学回路中试装置中进行的，该装置使用互连的流化床进行氧气载体循环。在进行这些实验之前，在喷射杯架上确定磨损率。由于颗粒比较小且重量轻，来自空气反应器的淘析量很高。

在总共32小时的实验时间内使用的燃料为木炭，脱挥发分的硬煤，石油焦和褐煤。除了变化的燃料外，还研究了燃料功率，固体循环和燃料反应堆温度的影响。

气体转化性能与燃料的挥发物含量明显相关，木材炭的峰值为97.8％，石油焦的峰值为94.6％，这是该装置中该特定燃料所达到的最高值。较高的温度和固体循环速率可提高气体转化率。没有发现随着时间的推移性能下降，特别是没有检测到由于硫的积累而导致的反应性损失。氧气载体在相关条件下释放出气态氧气。颗粒很容易流化并且细粉产量低，表明有足够的使用寿命。