Control of external epoxy and central oxygen flow in oxygen pipelines
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Could everyone discuss the advantages and disadvantages of installing flow control valves on the central oxygen pipeline? Why are some units equipped with control valves while others are not? What are also the advantages and disadvantages of installing flow control orifice plates on external epoxy pipelines? Some units are equipped with flow-limiting orifice plates, whose purpose is to increase the resistance in the outer epoxy pipeline, thereby facilitating the flow of central oxygen. However, some units do not have such orifice plates. In my opinion, if no flow-limiting device is used in the outer epoxy pipeline, it becomes difficult to ensure an adequate supply of central oxygen. The central oxygen pipeline has a smaller diameter, and in addition, a flow control valve is installed on it; as a result, the resistance in this pipeline will increase. On the other hand, since the outer epoxy pipeline has a larger diameter and no flow control valve is added to it, its resistance will inevitably be very low. Could everyone discuss this together? This post was last edited by xuqinger on 2009-2-21 20:12]
I asked the design institute about how to ensure an adequate oxygen level in the external epoxy pipelines without installing flow control orifice plates; their response was that it would be sufficient to meet the production requirements. However, I’m still not entirely convinced, so I’d like to hear everyone’s opinions on this matter. This post was last edited by xuqinger on 2009-2-21 at 20:13
The central oxygen flow meter is used to keep the flow rate at 20% of the total oxygen amount (the exact figure is not known), in order to ensure an optimal atomization effect； The flow-limiting orifice plate increases the resistance of the outer epoxy to prevent the oxygen flow at the center from becoming too low. Please correct any errors. Support Haichuan. This post was last edited by xuqinger on 2009-2-21 20:14.]
There is no need to use a flow-limiting orifice plate; however, an adjustment valve for the central oxygen pipeline is necessary. This depends on the situation, specifically on the diameter of the pipeline
Our unit uses a furnace with a pressure of 6.5 MPa; the outer epoxy pipe has a diameter of 6 inches, while the central oxygen pipe has a diameter of 2 1/2 inches. If we do not add any resistance to the flow in the outer epoxy pipeline (by installing flow-limiting orifice plates), it will inevitably affect the amount of oxygen supplied to the center. I hope that experts from other units with similar equipment can share their insights regarding the actual operating conditions in our unit. Thank you: handshake This post was last edited by shanxg on 2009-3-1 at 15:28.]
For your topic, the ratio of outer-ring to central oxygen should be around 85:15.
Could you please tell me more about the general principles for setting the ratio of outer ring to central oxygen?
The primary function of the central oxygen is to atomize the coal slurry. Determining the appropriate amount of central oxygen involves factors such as the volume of coal slurry fed in, its viscosity, flow rate, and the atomization angle of the nozzle; it requires knowledge from multiple specialized fields. The end result of using these two types of oxygen is to ensure that the atomized cloud of coal slurry matches the characteristics of the furnace cavity. This is what theory suggests, but it seems that the adjustments are made based on the principles I mentioned. The above is explained using Texaco technology as a model. Last edited by GSP on 2009-3-2 10:12 in this post.]