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Flame and radiation characteristics of gas-fired O_2/CO_2 combustion

机译：天然气O_2 / CO_2燃烧的火焰和辐射特性

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摘要

This paper presents an experimental study on the flame properties of O_2/CO_2 combustion (oxy-fuel combustion) with focus on the radiation characteristics and the burn-out behaviour. The experiments were carried out in a 100 kWth test unit which facilitates O_2/CO_2 combustion with real flue gas recycle. The tests comprise a reference test in air and two O_2/CO_2 test cases with different recycled feed gas mixture concentrations of O_2 (OF 21 @ 21 vol.% O_2, 79 vol.% CO_2 and OF 27 @ 27 vol.% O_2, 73 vol.% CO_2). In-furnace gas concentration, temperature and total radiation (uni-directional) profiles are presented and discussed. The results show that the fuel burnout is delayed for the OF 21 case compared to air-fired conditions as a consequence of reduced temperature levels. Instead, the OF 27 case results in more similar combustion behaviour compared to the reference conditions in terms of in-flame temperature and gas concentration levels, but with significantly increased flame radiation intensity. The information obtained from the radiation and temperature profiles show that the flame emissivity for the OF 21 and OF 27 cases both differ from air-fired conditions. The total emissivity and the gas emissivity of the OF 27 and the air-fired environment are discussed by means of an available model. The gas emissivity model shows that the increase in radiation intensity (up to 30%) of the OF 27 flame compared to the air flame can partly, but not solely, be explained by an increased gas emissivity. Hence, the results show that the OF 27 flame yields a higher radiative contribution from in-flame soot compared to the air-fired flame in addition to the known contribution from the elevated CO_2 partial pressure.
机译：本文针对O_2 / CO_2燃烧（氧燃料燃烧）的火焰特性进行了实验研究，重点是辐射特性和燃尽行为。实验是在100 kWth的测试装置中进行的，该装置可促进O_2 / CO_2的燃烧，并具有真实的烟气再循环功能。这些测试包括空气中的参考测试和两个O_2 / CO_2测试案例，它们具有不同的O_2再循环原料气混合物浓度（OF 21 @ 21体积％O_2、79体积％CO_2和OF 27 @ 27体积％O_2、73体积％CO_2）。介绍并讨论了炉内气体浓度，温度和总辐射（单向）曲线。结果表明，由于温度水平降低，与空燃条件相比，OF 21案例的燃料燃尽时间有所延迟。相反，就火焰温度和气体浓度水平而言，OF 27案例与参考条件相比，燃烧行为更为相似，但火焰辐射强度显着提高。从辐射和温度曲线获得的信息表明，OF 21和OF 27两种情况的火焰发射率均与空燃条件不同。通过一个可用的模型讨论了OF 27和空气环境的总发射率和气体发射率。气体发射率模型显示，与空气火焰相比，OF 27火焰的辐射强度增加（最多30％）可以部分但不是唯一地用增加的气体发射率来解释。因此，结果表明，除了空气CO_2分压升高的已知贡献外，OF 27火焰与空气火焰相比，由烟灰产生的辐射贡献更大。

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