DUCT WALL SURFACE STRUCTURE

• Main Authors: ODA MANABU, KIYOSAWA MASASHI, KUSHIOKA KIYONORI
• Format: Patent
• Language: English; Japanese
• Published: 16.03.2015
• Subjects: BLASTING; CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FORCOMBUSTION CHAMBERS, e.g. FIREBRIDGES; COMBUSTION APPARATUS; COMBUSTION PROCESSES; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDEDFOR; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS INCOMBUSTION CHAMBERS; ENGINE PLANTS IN GENERAL; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES; FLUES; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTIONRESIDUES; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTIONAPPARATUS; SEPARATION; STEAM ACCUMULATORS; STEAM ENGINE PLANTS; STEAM ENGINES; TRANSPORTING; WEAPONS

PROBLEM TO BE SOLVED: To provide a duct wall surface structure capable of reducing outflow to a duct downstream side by improving the collection rate of solid particles in a hopper, in a gas flue of an iron plate-based duct including the hopper flowing a solid-gas two-phase flow.SOLUTION: A duct wall surface structure of a gas flue 10 flowing a solid-gas two-phase flow containing large-diameter ashes 50 in an air flow includes: a first hopper 20A that is provided at the lower end part of a first vertical gas flue part 12 installed in a direction to be a flow having a velocity component in a vertical direction, and recovers the large-diameter ashes 50 from an air flow; and a low repulsion part 60 that is provided on an inclination surface 21 on which the large-diameter ashes 50 collide with each other on the upstream side in the flow direction of the first hopper 20A, and has a smaller repulsion coefficient than an iron plate. 【課題】固気二相流を流すホッパーを備えた鉄板製ダクトの煙道において、ホッパーにおける固体粒子の捕集率を向上させてダクト下流側への流出を低減できるダクト壁面構造を提供する。【解決手段】気流中に大径灰５０を含む固気二相流を流す煙道１０のダクト壁面構造であって、上下方向の速度成分を有する流れとなる方向に設置された第１垂直煙道部１２の下端部に設けられて気流から大径灰５０を回収する第１ホッパー２０Ａを備え、第１ホッパー２０Ａの流れ方向上流側で大径灰５０が衝突する傾斜面２１に、鉄板より反発係数の小さい低反発部６０を設けた。【選択図】図１