Reasons for the inward contraction of nozzles in water-coal slurry gasification
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In water-coal slurry gasification, the nozzle (coal slurry nozzle) is retracted by a few millimeters – what is the purpose of this?
Enhancing the premixing effect helps with the atomization of coal. Generally, Texaco’s top-fired systems use internal mixing burners.
It is generally used in single-nozzle water-coal slurry gasification furnaces, where its end face is recessed to a certain extent relative to the reference plane of the burner cross-section; this creates a premixing chamber for the water-coal slurry and the central oxygen. The outlet duct for the water-coal slurry is also designed to be constricted, so that the slurry entering the premixing chamber has a certain velocity. In the premixing chamber, central oxygen is used to dilute and initially accelerate the water-coal slurry, thereby improving its rheological properties; this is done to ensure good atomization of the water-coal slurry after it leaves the burner. The retraction amount of the external oxygen inlet is greater, with the aim of providing a higher flow rate of oxygen to ensure good atomization of the water-coal slurry mixture passing through the premixing chamber, thereby achieving optimal gasification effects in the gasifier.
I am referring to the distance between the coal slurry nozzle and the outer epoxy interface. I’m not talking about the central oxygen nozzle.
Colleagues, when answering questions, be sure to pay attention to what I am asking. Please take the time to read a simple sentence to the end; I am not referring to the premixing chamber, but rather to the nozzles in the coal slurry, and the effect of the 2-millimeter contraction at the outer surface of the burner.
The appropriate oxygen supply channel is selected to control the epoxy flow rate in the burner based on its cross-sectional area
What is the specific calculation method for the external epoxy flow rate here?
It’s more conducive to atomization and creating halos; there’s a character limit for posts too. If you have any questions, just ask in the group------------just filling space
Well, there is a character limit; thank you very much.
Volume flow rate is divided by the cross-sectional area, and then adjusted based on temperature and pressure