| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of uneven calcination in calcined gypsum and reduce fuel consumption in a calcination furnace by improving fluidity of a raw material gypsum sedimentation layer in the furnace.SOLUTION: A gypsum calcination furnace (1) comprises a furnace body (3-7) including a furnace inner wall surface having a circular or annular shape in a plan view, and a combustion tube (2) arranged at a center of the furnace body. Raw material gypsum (M) in the furnace is calcined or dried by a high-temperature gas jet flow (Hg) jetted from a bottom of the combustion tube. The calcination furnace has a plurality of fixed blades (10) arranged at angular intervals in the circumferential direction and in an outer peripheral region of a lower end part of the combustion tube. Adjacent fixed blades form a flow passage (P) of the raw material gypsum which deflects an upward flow of the high-temperature gas, jetted to a furnace bottom part, in the radially outward direction and the circumferential direction of the combustion tube. Deflection of fluids of the high-temperature gas and the raw material gypsum energizes the raw material gypsum near the furnace inner wall surface in the circumferential direction of the furnace body or assists the circumferential movement.SELECTED DRAWING: Figure 4 |
