Combustion–explosion suppression and environmental protection of typical sulfur-containing hazardous chemicals

Abstract

Sulfur, as a crucial chemical raw, poses increased combustion–explosion risks when mixed with other hazardous substances due to its dual nature as both an oxidant and a reducing agent. Additionally, sulfur-induced combustion and explosions can result in environmental pollution. Combustion–explosion suppression technology plays a crucial role in industrial production by effectively preventing hazardous chemical explosion incidents. This research investigates the combustion–explosion suppression of black powder, a common hazardous chemical containing sulfur, by utilizing two solid-based blast suppressants, NH₄H₂PO₄ and NaHCO₃. On this basis, examining changes in the oxidation states of sulfur and explaining the mechanisms of combustion–explosion suppression through the examination of combustion–explosion products. Additionally, numerical calculations are employed to analyze the evolution patterns of gaseous and solid-phase products throughout the entire combustion–explosion process. Research indicates that NaHCO₃ exhibits a more effective combustion–explosion suppression effect on black powder compared to NH₄H₂PO₄, which attributed to the valence state transformation of sulfur and the reduction of carbon oxidation. Furthermore, with the enhancement of combustion–explosion suppression effect, K₂S, which a pollutes the environment, is gradually transform converted into potassium fertilizer K₂SO₄, which benefits plants. These results offer new insights into the research of combustion–explosion suppression of sulfur-containing substances and environmental protection strategies.