An Xiuli, Cai Weiguang, Yang Yu, Zheng Shu, Lu Qiang
National Engineering Research Center of New Energy Power Generation, North China Electric Power University Beijing 102206 China
RSC Adv. 2023 Mar 13;13(12):8173-8181. doi: 10.1039/d3ra00217a. eCollection 2023 Mar 8.
The threat of global warming caused by greenhouse gases such as CO to the environment is one of the most intractable challenges. The capture and utilization of CO are essential to reduce its emission and achieve the goal of being carbon neutral, in which CO-diluted combustion is an efficient carbon capture technology. In this research, the effects of CO addition in the fuel side (CO-F), oxidizer side (CO-O) and both sides (CO-F/O) on temperature and soot formation in CH/air laminar co-flow diffusion flames were researched. The flame images were measured by a complementary metal-oxide-semiconductor (CMOS) imaging equipment. The two-dimensional distributions of temperature and soot volume fraction in CH/air laminar co-flow diffusion flames were measured employing the inverse Abel transform. The results demonstrated that the effect of amount variation of CO-F on the decrease of flame temperature was enhanced by the CO-O. The reduction in peak flame temperature was 4 K in the CO-F cases, while the reduction in peak flame temperature was 83 K in the CO-F/O cases. The soot formation was suppressed significantly by the effects of CO-F/O. Compared with the CO-F cases, the reductions in peak soot volume fraction were 22.5% and 23.5% in the CO-F/O cases. The suppression effect of amount variation of the CO-F on soot formation became more significant with the increase of flame height. The reductions in peak soot volume fractions were 0.3%, 3.07% and 6.38% at the flame heights of 20 mm, 30 mm and 40 mm in the CO-F cases, and the corresponding reductions were 4.92%, 5.2% and 16% in the CO-F/O cases, respectively.
由二氧化碳等温室气体导致的全球变暖对环境的威胁是最棘手的挑战之一。二氧化碳的捕集与利用对于减少其排放以及实现碳中和目标至关重要，其中二氧化碳稀释燃烧是一种高效的碳捕集技术。在本研究中，研究了在燃料侧添加二氧化碳（CO-F）、氧化剂侧添加二氧化碳（CO-O）以及两侧都添加二氧化碳（CO-F/O）对甲烷/空气层流共流扩散火焰中温度和碳烟形成的影响。火焰图像由互补金属氧化物半导体（CMOS）成像设备测量。采用逆阿贝尔变换测量甲烷/空气层流共流扩散火焰中温度和碳烟体积分数的二维分布。结果表明，CO-O增强了CO-F量的变化对火焰温度降低的影响。在CO-F情况下，峰值火焰温度降低了4K，而在CO-F/O情况下，峰值火焰温度降低了83K。CO-F/O的作用显著抑制了碳烟的形成。与CO-F情况相比，CO-F/O情况下峰值碳烟体积分数分别降低了22.5%和23.5%。随着火焰高度的增加，CO-F量的变化对碳烟形成的抑制作用变得更加显著。在CO-F情况下，在火焰高度为20mm、30mm和40mm时，峰值碳烟体积分数的降低分别为0.3%、3.07%和6.38%，而在CO-F/O情况下，相应的降低分别为4.92%、5.2%和16%。
