There is a question regarding the most appropriate water temperature for burner cooling water
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There is a view that it is appropriate to maintain the cooling water temperature above 170°C in order to prevent low-temperature corrosion of the burner coils. I think what is said makes a lot of sense; 170 degrees is below the dew point temperature of hydrogen sulfide, and this can cause corrosion at the burner tip. Everyone, please help analyze it.
It depends on the type of coal; the dew point temperature can be calculated based on the composition of the syngas
Personally, I think this problem shouldn’t exist; the cooling water is desalinated water, so there’s definitely no issue inside the coiled tubes. As for the outside of the coiled tubes, they are located in the vaporization furnace at an environment temperature of 1200°C, so there should be no dew point or low-temperature corrosion.
This will definitely be affected by thermal stress
Here, the main factor affecting the properties of steel is hydrogen sulfide.
I disagree; the burner cooling water coil creates a low-temperature zone around the outer wall of the burner.
It is not a low-temperature zone, but rather a negative-pressure zone. The vaporization furnace is a sealed space; when the burner sprays fuel, the flow velocity creates a certain negative-pressure area at the end and behind the burner.
A relative negative pressure can be created at the end, but how can negative pressure be created at the back? The condition under which no negative pressure is generated is that it needs to form a single unit with the front end. Furthermore, the low-temperature zone is not in conflict with negative pressure; the coil is intended to lower the temperature of the environment outside the burner’s outer wall.
In the low-temperature zone, it is understandable; if a negative pressure area is formed, then there would be no point in setting the water pressure so high and maintaining a certain pressure difference with the furnace pressure, right? Is this why throttle orifice plates are installed on the water adjustment pipeline to the burner?