In this talk, numerical investigation of interaction of coal dust or micron-sized particles with lean premixed methane-air flames is presented. A two-dimensional axisymmetric domain is employed to simulate conical premixed flames from lab-scale Bunsen burner. A chemical kinetic mechanism having 25 species and 121 elementary reactions, temperature dependent thermophysical properties, multi-component diffusion with Soret effect is used. Further it also includes sub-models to account for soot formation and oxidation and radiation energy loss due to participating species and soot. Discrete Phase Model (DPM) is used to simulate the transport of coal particles. Coal particles in varies size ranges and concentrations are injected into the premixed reactant mixture at equivalence ratio from 0.75 to 0.85. Multiple species from devolatilization of coal particles are considered to enter the gas-phase. Laminar flame speeds are predicted using numerical shadowgraphs and validated against the experimental data from literature. Injection of coal particles affects the laminar burning velocity and flame structure. The numerical model was able to predict the variation trends in the laminar flame speed data quite reasonably. At an equivalence ratio of 0.75, injection of coal particles in the size range of 1-25 microns results in an increase in laminar flame speed over that of the without coal particle injection at the same equivalence ratio. On the other hand, when the particle size range is increased to 75-90 microns, the laminar flame speed decreases below the without coal particle injection case. The reasons for these trends will be analyzed and discussed using fields of temperature, flow, reaction rate, heat release rate, species and DPM.