Defects of Cast Steel Nozzle

Release time:

2023-07-07 14:59

cast steel nozzles mainly include the following aspects.

1. Cast steel nozzle is not wear-resistant, corrosion-resistant, not high temperature resistant, short service life. Need to stop furnace replacement, resulting in great economic losses.

2. The cast steel nozzle is easy to be damaged during the operation of the unit, and the blunt body of the nozzle often falls off, which threatens the operation of the burner and the safe operation of the slag fishing machine.


3. As the nozzle is made of G40Cr20Ni5, this material works at high temperature for a long time. When the pulverized coal burns unstable, it will cause uneven temperature distribution in the furnace or coking at the nozzle, which will cause thermal stress at the nozzle due to temperature difference, resulting in severe local deformation of the nozzle, shorter primary air range and poor rigidity. The pulverized coal will catch fire not far from the nozzle, and the temperature near the nozzle will be high, resulting in local additional stress, when the temperature fluctuation is large, the thermal stress changes greatly, resulting in the formation of thermal fatigue cracks on the nozzle surface, a long time, resulting in burner nozzle and nozzle burning.

4. Because the primary air flow is a high-speed gas-solid two-phase flow, the uneven scouring of pulverized coal particles leads to serious local wear of the bluff body and even the bluff body is worn away. On the other hand, the nozzle and the bluff body are integrated. On the other hand, the thermal stress at high temperature is easy to cause the nozzle to produce serious deformation and even burn out, so the nozzle cannot play its due role. How to choose


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