【摘要】 在循环流化床中以不同粒径的聚苯乙烯颗粒作为冷态实验物料,分别研究了L阀水平段长度、颗粒粒径、充气点位置和立管高度对L阀排料的影响规律。实验结果表明:L阀水平段长度越长,颗粒流动越不稳定,达到相同的质量流率所需的充气量越高;L阀更加适合作为较大粒径颗粒的返料装置,并且颗粒粒径越大,达到相同的质量流率所需充气量越大;在满足立管压降的基础上,适当地提高充气点位置更有利于颗粒流量的稳定调节;立管高度越高,在相同充气量下,L阀的返料速率越大。在满足设计要求的前提下立管高度越高、充气点位置适当提高和采用较短的水平段都有助于提高L阀排料速率和操控的稳定性。更多还原

【Abstract】 With different particle size polystyrene particles as cold experimental materials, the effects of the L-valve horizontal section length, particle diameters, inflating section position and standpipe height on the L-valve discharge were studied in a circulating fluidized bed. The experimental results showed that the longer the horizontal length of L-valve was, the more unstable the granular flow was, and the higher of the aeration was needed to achieve the same mass flow rate. The L-valve was more suitable as a return device for the larger diameter particles. The larger the diameter, the greater the amount of aeration required to achieve the same mass flow rate. On the base of satisfying the pressure drop of the standpipe, properly increasing the position of the inflating point was more conducive to the stable regulation of the particle flow. The higher the standpipe height, the greater the return rate of the L-valve was under the same aeration volume. On the base of meeting the design requirements, a higher standpipe with a proper elevation of the inflation point and the use of a shorter horizontal section were helpful to increase the L-valve discharge rate and the stability of handling.更多还原