Why is the temperature difference of the cooling water in the gasifier burner so small?
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Why is the temperature difference of the cooling water in the gasifier burner so small? It’s only a few degrees; logically, the burner temperature should be quite high, right?
Burner cooling generally relies on a large flow rate and high velocity of fluid to remove sufficient heat, thereby maintaining the burner at its proper operating temperature. It should be based on maintaining the normal operating temperature of the burner, rather than aiming to raise the water temperature.
But the temperature is only a few degrees, so it’s better not to set it; there must be other reasons?
In both water-coal slurry gasification burners and dry powder coal gasification burners, the temperature rise of the burner cooling water is not significant; what are the differences in the mechanisms behind this?
For water-coal slurry burners, is there also a process of drying the coal slurry? This part also absorbs some thermal energy. Is this coal-fired furnace different?
Due to the injection of high-speed oxygen flow, there is a certain distance between the high-temperature combustion zone of the gasification furnace and the tip of the burner; furthermore, the heat absorption area at the burner tip is small, so the thermal radiation received by the entire burner tip is relatively weak
It’s still a matter of heat balance; less heat radiation received doesn’t mean none at all. If the heat cannot be removed in time, the temperature is likely to reach the material’s tolerance limit very quickly. Moreover, when the furnace conditions fluctuate, it is difficult to ensure that no tempering occurs; therefore, it is still necessary to have such a setting
A large temperature difference imposes higher requirements on the material and welding; it is much easier to achieve cooling by relying on flow rate
If there are any errors in my personal views, please correct them. The pipeline at the head of this burner is very thin, which results in a reduced flow rate and an increased flow velocity
First: After the coal slurry enters the furnace, it does not burn directly; there is a dark zone as well as a certain angle. Second: The burner cooling water coil retracts inside the burner chamber. Third: fast flow rate