Effects of excessive and insufficient outer epoxy flow rate in GE coal water slurry gasification on the gasification flow field and reactions
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Please discuss: the effects of excessive and insufficient outer epoxy flow rate in GE coal-water slurry gasification on the gasification flow field and reactions.
What a professional question; I’ll keep an eye on it
An excessive outer epoxy flow rate, meaning a small gap between the outer epoxies, results in high shear force on the coal slurry, and this does not match the flow rate of the middle burner. In my opinion, this leads to a slender flame in the burner, which affects atomization.
Generally, the outer epoxy gap is kept at 4 mm
I have not used GE’s gasification furnaces. It seems that when the total oxygen level remains constant, an excessive amount of external oxygen affects the shear force exerted by oxygen on the coal slurry, causing the slurry to form columns; this results in poor atomization and an increase in consumption； If the outer epoxy content is too low, the relative concentration of oxygen at the center is higher; this results in a longer flame and better atomization. However, the longer flame causes the temperature in the gasification furnace to drop, reducing the residence time of the coal slurry in the furnace, which again leads to incomplete gasification and increased consumption.