BOILER DUCT STRUCTURE, REDUCTION METHOD OF SOLID PARTICLES CONTAINED IN BOILER AND SOLID GAS TWO-PHASE FLOW

摘要

PROBLEM TO BE SOLVED: To reduce the effluence of solid particles to the duct downstream by improving the collection rate of the solid particles in a hopper.;SOLUTION: A boiler duct structure comprises: a second horizontal flue part 13 provided on the downstream of the air current by the combustion exhaust gas in the boiler in which air current flows in the horizontal direction; and a second vertical flue part 14 provided continuously to the terminal end part on the downstream in the flow direction of the air current in the second horizontal flue part 13 in which air current flows upward in the vertical direction. The second horizontal flue part 13 includes: a first duct part 17 having a channel cross sectional area which is constant along the flow direction; and a second duct part 18 connected on the downstream of the first duct part 17 in which the channel cross sectional area increases toward the downstream side. A lateral wall 18a provided in the vertical direction of the second duct part 18 has an angle θj, formed with a lateral wall 17a provided in the vertical direction of the first duct part 17, is larger than 0° and smaller than 45° or larger than 70° and smaller than 90°.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2018,JPO&INPIT