Abstract: To effectively control smoke from underground space fires, this article proposes a new smoke abatement technology with foam purification and builds an experimental platform. This paper briefly introduces the advantages of foam smoke elimination technology and expounds on the working principle of purification. This study experimentally analyzed the effects of different solutions and flue gas concentrations (CO2 concentration as the tracking substance) on the CO2 removal rate. The results showed that the CO2 removal efficiency of pure water, monomer foaming solution, and compound foaming solution were 38.18%, 56.71%, and 92.2%, which leads to the conclusion that the compound foaming solution has a significant purification effect on CO2. With the increase of inlet flue gas concentration, the CO2 removal rate decreased from 93.21% to 80.85%, which proved that the foam purification technology has a good absorption effect on CO2 in the flue gas. The results show that the foam has a pronounced control effect on underground smoke.

Key words: underground space, fire smoke, foam, purification