Abstract
The toxicity of CO threatens the life of people in the fire site. In this study, flame retardants of nano magnesium hydroxide particles and water-soluble flame retardant 8124 are used to be mixed into the aqueous film forming fire extinguishing agent (AFFF). Smoke-suppressed fire extinguishing agent was prepared in Waring-Blender mixing cup and then stirred at 3,000 r/min for 5 min. The new extinguishing agent shows a good performance of absorption of CO and reducing the flue gas temperature. The concentration of CO was decreased below 131 ppm and flue gas temperature was basically kept below 40°C, which was 367 ppm and 83.1°C less than that in free-fire. Using new extinguishing agent can effectively reduce the harm to the trapped personnel and firemen in the fire site. It was of great significance. The harm of CO concentration below 131 ppm and flue gas temperature below 40°C was low. The time to reach the maximum CO concentration and the maximum flue gas temperature was delayed, which ensures that people have more time to escape. Even if there was not enough time to escape, people will not be seriously threatened.
Highlights
The fire typical gas carbon monoxide (CO), which can cause loss of human life, is unavoidable during combustion of fuels
It was shown that CO concentration and flue gas temperature increases significantly in free-burning
It was believed that it was harmful if CO concentration was over 24 ppm
Summary
The fire typical gas carbon monoxide (CO), which can cause loss of human life, is unavoidable during combustion of fuels. It is the most lethal component of the toxic smoke (Zhao, 2012; Hampson et al, 2019). Toxic gas has brought great difficulties to personnel evacuation and fire fighting (Liu et al, 2020). Some researches indicated that myocardial infarction was associated with exposure to ambient carbon monoxide (Lee et al, 2020). Altered regional homogeneity in delayed encephalopathy, which is manifested as local brain dysfunctions, will be found after carbon monoxide poisoning (Wu et al, 2020). It is important to develop new fire extinguishing agents for improving the CO emission inhibition performance
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