Abstract:In order to reduce the use of fossil fuels, and develop clean, low-carbon, and renewable new energy sources. In this paper, the combustion experiment of micro-nano iron powder fuel is carried out. The surface area, thermogravimetric curve and X-ray diffraction pattern of iron powder with different particle sizes were obtained by the specific surface area experiment, thermogravimetric analysis experiment and X-ray diffraction experiment of micro-nano iron powder. The effects of particle size on surface area and thermogravimetric curve were analyzed. The combustion characteristic parameters and combustion kinetic parameters of iron powders with different particle sizes were studied at the heating rate of 40K/min. The particle swarm algorithm was used to fit the combustion rate differential equation to establish a combustion model of micro/nano iron powder. The results show that except for 50nm iron powder, with the increase of particle size, the ignition point temperature, maximum combustion rate temperature, burnout temperature, activation energy and pre exponential factor of iron powder increase. The 50nm iron powder will melt and condense at high temperatures, which will increase the burnout temperature and prolong the burnout time, which is not conducive to the normal reaction. For iron powder of any particle size, the combustion characteristic parameters and combustion kinetic parameters of micro/nano iron powder with different particle sizes can be approximated by the iron powder combustion rate differential equation established in this paper. The error is within the allowable range.