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›› 2006, Vol. 6 ›› Issue (4): 517-521.

• 流动与传递 • 上一篇    下一篇

不同粒度分布高硫焦颗粒在强混燃烧器内的流动特性

阮宇军,卢春喜,时铭显   

  1. 燕山石化
  • 出版日期:2006-08-20 发布日期:2006-08-20

Flow Behavior of High-sulfur Petroleum Coke with Different Particle Size Distributions in a Novel Strong Mixing Reactor

RUAN Yu-jun,LU Chun-xi,SHI Ming-xian   

  1. China University of Petroleum
  • Online:2006-08-20 Published:2006-08-20

摘要: 利用一套新型强混燃烧器,对3种不同粒度分布的高硫焦颗粒的流动特性进行了较为详尽的考察. 反应器主要由预混段和提升段组成,两部分结构尺寸分别为f240 mm′3000 mm和f70 mm′9000 mm. 实验操作条件为:提升管表观气速8~18 m/s,颗粒循环速率60~200 kg/(m2×s). 通过对3种不同粒度分布的颗粒在强混燃烧器内颗粒固含率、颗粒速度轴径向分布的测定,发现随掺入细颗粒比例的增加,截面平均颗粒速度降低;在较粗的高硫焦颗粒中适当掺入细粉,可使床层内颗粒固含率增加,返混加剧,停留时间延长,有利于高硫焦的充分燃烧.

关键词: 强混反应器, 固含率, 颗粒速度, 粒度分布

Abstract: The flow behaviors of high-sulfur petroleum coke with three different particle size distributions in a novel strong-mixing riser reactor were systematically investigated. The reactor was mainly composed of the pre-mixed zone and the lift zone, the structural dimensions of the two zones were respectively 240 mm ID, 3000 mm length and 70 mm ID, 9000 mm length. The experiment was carried out with the superficial gas velocity from 8 to 18 m/s and solids circulating rate from 60 to 200 kg/(m2×s). Through the experimental measurements on the axial and radial distributions of solids holdup and velocity in the strong-mixing riser reactor, it is found that, with increasing the proportion of fine powder in the coarse particles appropriately, the cross-section mean solids velocity will reduce, and the solids holdup will increase, moreover the back-mixing of particle is intensified and the residence time of particle will extend, which are beneficial to sufficient combustion of high-sulfur petroleum coke.

Key words: strong-mixing reactor, solids holdup, particle velocity, particle size distribution