Cui Liwei, Li Xiaobin, Yang Guang
Graduate Department, China People's Police University, Langfang 065000, China.
Department of Fire Protection Engineering, China People's Police University, Langfang 065000, China.
ACS Omega. 2020 Oct 14;5(42):27133-27141. doi: 10.1021/acsomega.0c02834. eCollection 2020 Oct 27.
This paper presents the coupling relationship between the flame emission spectrum and explosion characteristics of CH/air mixtures with NaHCO powder added. Due to the test of different concentrations of suppression powder in 20 L spherical-explosion-test devices, the flame emission spectrum and explosion pressure data were collected. In this experiment, four kinds of excited radicals, including CN*, HCHO*, CO*, and OH*, have a higher probability of being detected, and the changes of their existence duration and spectral intensity show strong regularity. Results reveal that for suppressant concentration in the range of 0-50 mg/L, together with the improvement of a suppression effect, the existence duration and spectral intensity of CN*, CO*, and OH* decrease, which is opposite to that of HCHO*. Besides, the spectral intensity of OH* and CO* shows a good linear relationship with the change of the maximum explosion pressure. Controlling the content of CN*, CO*, OH*, and HCHO* is of great significance in suppressing the explosion.
本文介绍了添加NaHCO粉末的CH/空气混合物的火焰发射光谱与爆炸特性之间的耦合关系。通过在20L球形爆炸试验装置中对不同浓度抑制粉末进行试验，采集了火焰发射光谱和爆炸压力数据。在本实验中，包括CN*、HCHO*、CO和OH在内的四种激发自由基被检测到的概率较高，它们的存在持续时间和光谱强度变化呈现出很强的规律性。结果表明，对于0-50mg/L范围内的抑制剂浓度，随着抑制效果的提高，CN*、CO和OH的存在持续时间和光谱强度降低，这与HCHO相反。此外，OH和CO的光谱强度与最大爆炸压力的变化呈现出良好的线性关系。控制CN、CO*、OH和HCHO的含量对抑制爆炸具有重要意义。
