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Experimental research on inerting characteristics of carbon dioxide used for fire extinguishment in a large sealed space
- Source :
- Process Safety and Environmental Protection. 142:174-190
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- To accurately guide the quantitative injection of carbon dioxide for extinguishing the fire or diluting the accumulated toxic gases, 26 sensing devices used for detecting the multiple environmental parameters were firstly laid inside and outside of 210 m3 large sealed space, then each signal output from the sensing devices was transmitted successively to the A/D conversion module and the server with signal acquisition and analysis software, so the experimental research on inerting characteristics of carbon dioxide in different physical forms in this sealed space were carried out by using the mobile liquid storage and injection equipment, including fire source extinction, and accumulation and distribution of gas components, as well as cooling. Results show that: (1) For wood and gasoline, the critical oxygen concentration of combustion 16.98 % and the corresponding carbon dioxide concentration 28.6 % were determined comprehensively; (2) The concentration layering law in the stabilized gas was proved to be inconsistent with theoretical correspondence between specific gravity and height; (3) For direct liquid injection and gas perfusion at 2.2 MPa, the average temperature difference were 13.8 °C and 0.3 °C respectively, so the temperature drop characteristic of liquid injection was proved, and its optimal cooling distance from the nozzle is further determined from 5.6 m to 11.2 m.
- Subjects :
- 021110 strategic, defence & security studies
Environmental Engineering
Materials science
General Chemical Engineering
Nozzle
0211 other engineering and technologies
Analytical chemistry
Extinguishment
02 engineering and technology
010501 environmental sciences
Combustion
01 natural sciences
chemistry.chemical_compound
chemistry
Extinction (optical mineralogy)
Carbon dioxide
Environmental Chemistry
Limiting oxygen concentration
Gasoline
Safety, Risk, Reliability and Quality
0105 earth and related environmental sciences
Specific gravity
Subjects
Details
- ISSN :
- 09575820
- Volume :
- 142
- Database :
- OpenAIRE
- Journal :
- Process Safety and Environmental Protection
- Accession number :
- edsair.doi...........d53b3d890dfde1972e3c9b1c5e0c03a7