Experimental study of the combustion of single carbon particles in the atmospheres О2/Н2О and O2/N2O

Abstract

A research method of single carbon particles combustion process has been developed using high-speed filming. A new experimental device has been designed and built, easy to setup and run, which makes it possible to measure the combustion time of a fuel particle lying at the bottom of the reactor and blown by a gas flow. An experimental research of combustion processes of graphite particles was carried out in О2/N2 and О2/Н2О atmospheres using following parameters: fractional range 0,16-2 mm particles, the temperature in the reaction zone was 900-1150°C, the concentration of oxygen in the mixture was 43-100 %. The studies were carried out at gas flow rates that do not affect the combustion rate of the particle, with a completely sufficient amount of oxygen in terms of balance for complete combustion, based on the initial mass of the particle. The experimental results show the effect of water vapor concentration in the mixture at a specific combustion rate. It has been shown that replacing the inert gas in an oxidizing atmosphere with H2O leads to the process intensification and increases relative reactive capacity of fuel. There relative reactivity of graphite to be up to 19% higher in the О2/Н2О environment than in the О2/N2 atmospheres. The influence of concentration of O2 on the pit is the liquidity of combustion in the oxidative sum of O2/H2O is of a small linear nature and is especially strongly manifested at fractions less than 0.3 mm. On big fractions (> 1 mm) it is very faintly visible