This study describes the performance and stability characteristics of a Hybrid Solar Receiver Combustor operated in the Moderate or Intense Low oxygen Dilution (MILD) combustion regime, in which the functions of a solar receiver and a combustor are integrated into a single device. The device was built and tested at a nominal capacity of 20 kW_th for both the combustion-only (MILD and conventional combustion) and mixed-mode (a combination of both solar and combustion). Here, a 5 kW_el xenon-arc solar simulator and natural gas were used as the energy sources, while the combustion mode was operated in the MILD combustion regime. The thermal efficiency, wall cavity temperature, heat flux distribution within the cavity and pollutant emissions are reported for the two modes of operation for a range of energy input, equivalence ratio, heat extraction, air preheat and solar-to-fuel energy input ratio. The stability limits for stable operations are also identified for each mode of operation. It was found that MILD combustion can be successfully stabilised within the HSRC in a wide range of operating conditions with and without air preheating, and in the mixed-mode of operation, providing ultra-low NO_x and CO emissions. Also, the stability limits were found to increase by adding concentrated solar radiation to the combustion process. The thermal performance was found to be similar in both combustion-only (conventional combustion and MILD) and mixed-mode (up to ≈ 88% assuming reasonable heat recovery from the exhaust gas), confirming that an overall benefit can be derived from the device.

这项研究描述了在中等或强烈的低氧稀释（MILD）燃烧状态下运行的混合式太阳能接收器燃烧器的性能和稳定性特征，其中太阳能接收器和燃烧器的功能集成在单个设备中。该设备在纯燃烧（MILD和常规燃烧）和混合模式（太阳能与燃烧的组合）下都以20 kW _th的额定容量进行了构建和测试。在这里，使用5 kW_el氙弧太阳能模拟器和天然气作为能源，而燃烧模式在MILD燃烧状态下运行。热效率，壁腔报告了两种操作模式的温度，腔体内的热通量分布和污染物排放情况，这些模式适用于一定范围的能量输入，当量比，热量提取，空气预热和太阳能燃料能量输入比。还针对每种操作模式确定了稳定操作的稳定性极限。据发现，MILD燃烧可以成功地在HSRC内广泛使用和不使用空气预热操作条件的稳定化，并且在操作的混合模式，从而提供超低NO _X和一氧化碳排放。而且，发现通过将浓聚的太阳辐射添加到燃烧过程中来增加稳定性极限。发现在仅燃烧（常规燃烧和MILD）和混合模式下的热性能都相似（假设从废气中合理回收热量，则高达≈88％），这证实了该装置可带来总体收益。