论文部分内容阅读
大型循环流化床(CFB)锅炉设计中广泛采用裤衩腿型的炉膛结构,炉膛内的翻床往往会造成停机事故.根据Glicksman的Scaling-Low模化准则,以具有裤衩腿结构的300MW CFB锅炉炉膛为原型,设计并建立了CFB冷态实验台.采用带通孔的中隔墙控制横向物料流动的高度和流通面积,设计了裤衩腿型炉膛内的翻床实验.动态的压力和风量测量结果表明,两侧炉膛内物料流动不对称导致了上部存在的物料横向流动,是发生翻床的根本原因;发生翻床的必要条件是固体物料产生的床压降足以控制单侧炉膛总压降的变化趋势;当炉膛上部横向通流截面平均高度降低或横向通流截面积减小时,两侧炉膛存料量的变化速率都会减缓.
Large circulating fluidized bed (CFB) boiler design is widely used in the pant leg type hearth structure, the furnace bed overturning often cause downtime.According to Glicksman’s Scaling-Low modeling guidelines, with the legs of the legs of the structure of the 300MW CFB boiler Furnace as a prototype, designed and set up a CFB cold test bench.With the through hole with a wall to control the horizontal flow of material flow height and flow area, the design of the pants inside the leg-type furnace bed experiments. Dynamic pressure and air flow measurement The results show that the asymmetric flow of materials in the two sides of the furnace leads to the lateral flow of the material in the upper part and is the root cause of rollover. The necessary condition for bed rollover is that the bed pressure drop caused by the solid material is enough to control the total pressure drop When the average height of the transverse cross-section of the hearth decreases or the cross-sectional area of the cross-flow decreases, the rate of change of the furnace stock volume on both sides will slow down.