The Particle Size recommended by our company is the result based on the calculation of solid particle program and the emission. Adopting this fuel grading is because of its best carbon particle burning efficiency and appropriate emission. A proper selection of the fuel grading may result in a reasonable fluidized speed whilst the speed in dense phase area will determine furnace geometric size. Hence, it is a critical data. Therefore, in this project, in order to obtain a best furnace performance, our company specially brings up the requirement of particle size for fuel grading as shown in Drawing 1.