Abstract
This paper presents the coupling relationship between the flame emission spectrum and explosion characteristics of CH4/air mixtures with NaHCO3 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.
Highlights
A gas explosion is one of the most serious accidents in coal mines
The mitigation of gas explosion hazards is an important topic in the process safety industry
Among the current major explosion suppressants, powder explosion suppressants have gradually become the preferred choice for suppressing methane explosion due to their advantages of high efficiency, low cost, easy preservation, and safe transportation.[1]
Summary
CH4 is the major ingredient of mine gas. The mitigation of gas explosion hazards is an important topic in the process safety industry. Among the current major explosion suppressants, powder explosion suppressants have gradually become the preferred choice for suppressing methane explosion due to their advantages of high efficiency, low cost, easy preservation, and safe transportation.[1] Some powder fire extinguishing agents that have shown good fire extinguishing efficiency have been widely studied due to their inhibition effect on methane explosion, such as various dry chemicals, SiO2 and its homogeneous substances, and urea. NaHCO3 is the main component of the BC dry powder extinguishing agent, which has become one of the main research objects due to its good effect in extinguishing combustible liquid and gas fires. The development of a flame emission spectroscopy study makes flame chemiluminescence an important means of studying combustion and explosion
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