461 / 2018-12-31 11:14:06

床料物性对循环流化床流化特性影响的冷态实验研究

循环流化床，床料，压降，循环流率；Circulating fluidized bed, Bed material, Pressure drop, Circulating flow rate

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随着大气污染形势日趋紧张，氮氧化物排放的相关法规也日益严格，实现氮氧化物的超低排放成为燃煤循环流化床锅炉的重要目标。氮氧化物的生成和控制与流化床流化特性及气固流动有关。本文在自行搭建的循环流化床实验系统上进行冷态实验，研究了不同床料、初始床料高度、床料颗粒粒径、循环灰等参数对流化状态、炉内压降、物料循环流率的影响。研究表明，随着初始床料高度的增加以及床层平均颗粒增粗，床层的压降升高，密相区高度增加，所需的流化风速增大；颗粒的循环流率受初始床料高度、床料平均粒径及流化风速的共同作用。

With the increasingly tense situation of air pollution and the increasingly stringent regulations on the emission of nitrogen oxides, the realization of ultra-low emission of nitrogen oxides has become an important goal of coal-fired circulating fluidized bed boilers. The formation and control of nitric oxides is related to the fluidization characteristics and gas-solid flow of a circulating fluidized bed. In this paper, cold-state experiments were conducted in a self-built circulating fluidized bed to study the effects of types, static bed height and particle diameter of bed material on fluidization status, pressure drop and circulating flow rate. Results show that as the static bed height and the particle diameter of bed material increase, pressure drop increases, and the height of dense phase zone is elevated and fluidization wind increases. The circulating flow rate of particles is determined by static bed height, average diameter of bed material and wind speed altogether.