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Cold flow mixing rates with recirculation for pulverized coal reactors
Author(s) -
Tice Christopher L.,
Smoot L. Douglas
Publication year - 1978
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690240613
Subject(s) - mixing (physics) , pulverized coal fired boiler , particle (ecology) , tracer , combustion , chemistry , combustion chamber , mechanics , complete mixing , flux (metallurgy) , volumetric flow rate , materials science , mass transfer , chromatography , nuclear physics , physics , oceanography , organic chemistry , quantum mechanics , geology
The mixing of particles and gases in confined, coaxial jets in the presence of recirculation was studied. Particle and gas mixing rates were measured for conditions simulating processes involving pulverized coal combustion and entrained gasification. The effects of mixing chamber diameter, gas velocity, particle size, and particle loading level on mixing rates were determined from particle mass flux and gas tracer measurements. In every case, the gas mixed much faster than did the particles. Introduction of an expanded mixing chamber of larger diameter (with recirculation zone) significantly increased both gas and particle mixing rates over that for a smaller mixing chamber without recirculation. However, this observed increase was not strongly dependent upon the diameter of the larger mixing chamber. Increasing secondary velocity also increased mixing rates significantly.