Abstract. The problem of particle ignition coal-water fuel (WCF), located in the high-flow environment has been solved numerically. The flow of the main processes of joint thermal treatment (thermal conductivity, evaporation, thermal decomposition, chemical reaction of vapor and carbon) has been taken into account. Set the scale effect of the concentration of the organic portion of the fuel on the dynamics of particle ignition of fuel. The obtained results ignition delay time values are coordinated well with published experimental data.