The Research on the Best Mode of the Negative- ion Smoke-removal Helmet and the Negative-ion Emitters Equipped in a Fire Scene

According to research worldwide, dense smoke usually spreads faster than flames when a fire occurs. This situation often causes firefighters to feel “spatially confused”, making them run out of oxygen, or escapers cannot see the escape route and inhale harmful smoke. This situation always causes a regretful incident. Therefore, this research has developed a negative-ion smoke-removal helmet. We respectively installed direct current and alternating current negative ion emitter modules on the front edge of the helmet, then put the helmet in a transparent smokebox to observe its PM2.5 removal ability in unit space. During the experiment, we set up a camera outside the transparent smokebox to record visual changes in the external environment and a small webcam inside the helmet to record the changes in visibility inside the helmet simultaneously. Finally, when the PM2.5 value no longer drops, the smoke removal process ends. Then, through the changes of the RGB value of the internal image record, the helmet visibility change ratio between the start and the end of the smoke removal process is calculated. At the same time, to explore the best mode of the negative ion emitter array installed in a building staircase, we installed a negative ion emitter with a small fan on the wall of a building's staircase to record the corresponding data between the factors of emitter power, emitting height, wind speed, negative ion concentration, negative ion scattering radius. Through this research, we hope to provide better protection for escapers and firefighters in a fire scene.