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Ф240mm×3000mm和Ф70mm×9000mm．实验操作条件为：提升管表舰气速8～18m／s，颗粒循环速率60～200kg／（m^2·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。
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, 3 000 mm length and 70 mm ID, 9 000 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/（m^2·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.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2006年第4期517-521,共5页
The Chinese Journal of Process Engineering
关键词
强混反应器
固含率
颗粒速度
粒度分布
strong-mixing reactor
solids holdup
particle velocity
particle size distribution
