HSD (portable) uses strong air convection technology to make hydrogen peroxide molecules quickly and evenly without dead angle dispersion, with high penetration and lethality, and has no corrosion on the surface, and good compatibility. It has residual analysis function and residual over-limit alarm function, and is equipped with replaceable single-channel air duct and dual-channel air duct. It only needs to input spatial data, and the equipment can automatically calculate the working time and start the working program to meet the needs of different disinfection environments.