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颗粒循环流率是双循环流化床气化装置性能优化的重要因素,而给风特性是影响颗粒循环流率的主要参数之一。自行设计并搭建了双循环流化床冷态试验台,试验研究了两床给风特性对颗粒循环流率的影响,重点分析了提升管二次风特性对颗粒循环流率的影响。试验表明:物料固定粒径、固定静床高时,颗粒循环流率随着两床风速的增大而增加,二次风速超过一定值后,颗粒循环流率增加的趋势趋于平缓;提升管径向给入二次风比切向给入二次风时颗粒循环流率大;颗粒循环流率对二次风口高度变化敏感,二次风口布置在距布风板15 cm时比20 cm时颗粒循环流率明显增加;颗粒循环流率随着风口数目的增加稍有增加。
Particulate circulating flow rate is an important factor in optimizing the performance of a two-cycle fluidized bed gasification unit, and the wind characteristics are one of the main parameters that affect the circulating flow rate of the particles. The double-circulating fluidized bed cold test stand was designed and constructed by ourselves. The influence of two-bed wind characteristics on the circulating flow rate of the particles was experimentally studied. The influence of the secondary air characteristics of the riser on the circulating flow rate of the particles was analyzed emphatically. The results show that the particle circulation flow rate increases with the increase of the two-bed velocity when the fixed particle size and the fixed bed height are high. When the secondary air velocity exceeds a certain value, the tendency of the particle circulation flow rate increases tends to be gentle. The radial circulation rate of the particles is larger when the secondary air is fed into the secondary air than the secondary air. The circulation rate of the particles is sensitive to the height of the secondary air passage. When the secondary air passage is arranged at a distance of 15 cm from the air distribution plate, The circulation rate of particles increased obviously. The circulation rate of particles increased slightly with the increase of number of tuyeres.