The reason why the hood layer is scarred and the eye holes are blocked
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The hood recently had its eye holes plugged. When I parked the car and checked, I found that the castables were covered in scars up to the top of the hood. The structure was layered, with layers stuck together. The hood hole extends outward to about 2 cm. Finally, the air volume gradually decreases and the boiling in the furnace worsens. Please analyze whether the reason is the operation or the materials.
It has a lot to do with the raw materials, as well as the operation. The scarring on the hood is mainly caused by the raw materials containing low melting point substances, that is, the raw materials contain high impurities. I don’t know if you are making acid from zinc concentrate or sulfur. We use zinc concentrate as the raw material. The supply of raw materials has been tight from the past year to now. The mixed ore and sulfur particles are burned together. Now there are 6 systems and 3 furnaces are not boiling well.
I'm not very familiar with boiling furnaces, so I would venture to suggest: Add quartz sand with a high specific gravity to the ebullating bed, and at the same time raise the discharge port to reduce quartz sand consumption, so that the main thing in contact with the wind cap is quartz sand.
Do not increase the slag discharge port too high. The low pressure of the furnace will be too high and the air volume will be small, which will cause slag discharge problems. Adding quartz sand probably won't work. It will either blow it away or affect the boiling of the entire furnace.
It's a good idea, mainly to control the furnace temperature
The scab on the hood should be caused by the low hole speed of the hood and poor boiling effect.
I personally think this method will not work. Adding quartz sand to the furnace will definitely affect the heat balance in the furnace, affect the bottom pressure of the furnace, affect the gas velocity, and more affect boiling and quality.
Just add a thin layer to cover the hood