Lime: From the perspective of calcined limestone desulfurization equipment to see the production, according to the choice of the particle size of limestone desulfurization limestone sales, determine the kiln firing system structures, especially vertical preheater. The basic contents include: the impact of material accumulation state, speed, hot and cold air permeability degree of expansion effects, heat transfer, thermal efficiency, the decomposition rate, productivity and calcining lime final result. In recognition of the concept of lime, lime is used to reflect the physical nature of the content: the color of lime, crystal structure, organization, smell, porosity, bulk density, specific gravity, bulk density, melting point, boiling point, thermal conductivity, specific heat, light, resistance, hardness, expansion coefficient, refractive index, angle of repose and the like.