Distribution of particle resident time in a combined coaxial gas–solid two-phase impinging stream

Abstract

Gas–solid two-phase impinging stream technology is the process of strengthening the interphase reaction. Short resident time of particles in the impingement region directly leads to inadequate engineering reaction. Therefore, improving the particle resident time in the impingement region can promote engineering application efficiently and adequately. In order to improve the particle resident time in the impingement region, this paper presents a new type of impinging stream technology, named the combined impinging stream (CIS). Flow characteristics of the CIS are studied by means of CFD-DEM at different L/D of impinging stream reactor. Besides, the particle motion behavior and the particle resident time in the impingement region are also studied. The results show that the impingement region of the CIS is instantaneously moving in the collision chamber. The CIS shortens the particle resident time in the jet region and increases the number of passing through the impingement region; the particle does the oscillatory movement in the impingement region, which greatly improves the particle resident time in the impingement region. Therefore, reasonably setting inlet fluid velocity can greatly improve the particle resident time in the impingement region at different L/D.

Additional information

Funding

This work is supported by the National Natural Science Foundation of China [Grant No. 51506072 and 51375183] and the National Basic Research Program of China (Project No. 2015CB251504).