Simply relying on the detection of smoke as a criterion for whether a fire occurs, it is impossible to distinguish between kitchen fumes and real fire smoke. If the CO and CO2 volume fraction values ​​are added as fire criteria, that is, multi-component composite detection technology using integrated smoke, CO and CO2, then It can effectively reduce or even eliminate false alarms caused by kitchen fumes. This multi-component composite detection technology is one of the research focus and hotspots in the field of fire detection. As a typical source of false detection of fire detection, kitchen fumes are selected according to the characteristics of cooking in China. The selection of fried green pepper and fried fish is used to generate kitchen fumes, and the fire detection comprehensive simulation experiment platform is used to cause false alarms on smoke detectors caused by kitchen fumes. Research was conducted and compared to real fire smoke.
Based on the experimental results, the following conclusions are drawn:
(1) At present, both ion and photo-electric smoke detectors cannot distinguish between kitchen fumes and real fire fumes. That is, after the kitchen fumes enter the detector analysis chamber, light scattering will occur or the resistance of the ionization chamber will change.
(2) The concentration of CO and CO2 in the kitchen fumes is small, while the amount of CO and CO2 contained in the real fire smoke is relatively large; the open flame generates more CO2, while the smoldering fire generates more CO.
(3) By comprehensive multi-component detection technology of smoke, CO and CO2, it can effectively reduce false alarms caused by fire detectors caused by kitchen fumes.
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