A binary collision-aggregation model of inhalable particles PM 10 from coal combustion in uniform magnetic field was developed for evaluating aggregation coefficient between two particles. The removal rate of fly ash particles from the boiler firing Datong bituminous coal was simulated by solving the general dynamic equation with the obtained aggregation coefficient. A comparison between numerical simulation results and experimental data was made. The simulation results indicated that the aggregation coefficient increased with particle size. The bigger the size difference between two particles

the stronger the action of gravity on aggregation

while the bigger the particle size

the weaker the action of Brownian force. With an increase in magnetic flux density

the particle removal rate increased at first

then approached its maximum

which was similar with the relationship between aggregation coefficient and magnetic flux density. With increasing particle residence time in the magnetic field or increasing mass concentration

the removal rate increased

and reached 44% while mass concentration and residence time was respectively 40 g·m-3 and 1. 2 s. Numerical simulation results were in good agreement with the experimental data.