IMPACT OF PASSAGE STRUCTURE ON LOOP SEAL OPERATING CHARACTERISTIC

摘要：

　　Loop seal is one of the most commonly used non-mechanical valve in a circulating fluidized bed (CFB) boiler.When the solids conveyed horizontally from the supply chamber to the recycle chamber, the length of the horizontal section will cause much flow resistance, which not only influences the fan burden but also the mass balance between the furnace and the external loop.In this paper, a high resistant loop seal without aeration in the horizontal passage (H-type loop seal) and a low resistant loop seal with a slope passage (N-type loop seal) was used, respectively.Flow characteristic of quartz sand (Geldart-B particles) in the new type loop seals was studied by comparison with a traditional loop seal (U-type loop seal).The experimental data show that the high resistance in the horizontal passage will weaken the solids recycling capability of the loop seal obviously, so the H-type loop seal is hard to attain a high solids flow rate.However, the slope passage presents a low solids flow resistance, so the pressure drop of the N-type loop seal is much less than the traditional one.Less aeration and less bypassing air are also found with the same solids flow rate through the N-type loop seal.For the N-type loop seal, a small amount of vertical aeration on the supply chamber can further improve the solids recycling capability.

关键词： Circulating fluidized bed Loop seal N-type loop seal

作者: Wang Peining Xing Wenchong Liu Qing Yang Hairui Lv Junfu Zhao Yonggang Baiyang

作者单位: Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Ther Shenhua Shendong Power Company Ltd.,Shanxi,719300,China

会议类型: 国际会议

会议名称: The 11th International Conference on Fluidized Bed Technology(CFB-11)(第十一届流化床技术国际会议)

会议地点: 北京

会议语种:英文

页码: 899-903

在线出版日期: 2014-05-14（万方平台首次上网日期，不代表论文的发表时间）