Explosion of the coal slurry burner pipeline in the gasifier
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We are Texaco Gasification. Some time ago, after shutting down the furnace at the control room, an explosion occurred in the pipelines of the slurry burner; this explosion mainly took place between the downstream shut-off valve for the slurry and the burner valve, and it seems to have happened during the purging process. A coal slurry pipeline exploded into pieces, with debris flying from the eighth floor to the fifth floor; fortunately, no one was injured. Which sea friend can analyze in detail the cause of the explosion?
Is there a possibility of improper operation during shutdown that could cause slurry to enter the burner pipeline? ! ! ! !
Data is needed: the changes in data before and after the explosion
I’m quite interested in this, but there are too few relevant parameter values to conduct an analysis. Keeping an eye on it! Now, an additional trip condition has been added to the Texaco gasification trip interlock (SDI): a trip when the temperature in the slurry pipeline (between the downstream shut-off valve of the slurry and the manual valve at the furnace head) reaches 95 degrees Celsius. It’s not clear whether this is related to the issue at hand; it’s possible that hot raw gas has flowed back into the slurry pipeline, resulting in the formation of an explosive mixture within that pipeline, which could explode upon contact with a flame ? ? ? ? It just doesn’t make any sense; I hope experts can provide an explanation! ! !
GE’s newly added trip interlock is related to the high temperature of the slurry pipeline, that is, the T24 interlock. It was designed based on accidents that have occurred at a certain company in the past. The backflow valve of the coal slurry pipeline was accidentally opened, causing syngas to flow back; this was done to prevent high-temperature syngas from flowing back and causing injury.
What is the reason for the manual stop? After parking, does the valve of the safety system function properly? I hope relevant data can be provided so that everyone can help with the analysis.
Did an explosion occur while executing the parking sequence when parking? I’m now hesitant to press the parking button next time. Between the two cut-off valves and the burner valve, does that mean the two cut-off valves are already closed? That temperature cannot be detected. Is there a leak between the second cut-off valve and the burner valve? During operation, the outlet pressure of the pump prevents the high-temperature gas from flowing back, but once the machine stops and the valve is closed, that leakage point becomes an outlet for the high-temperature gas, resulting in a \"bang\"~~”
Is there any issue with the nitrogen purge valve on the coal slurry pipeline?
This post was last edited by jensse on 2015-8-10 21:32. As mentioned above, after the central control parking button was pressed, during the nitrogen purging phase, an explosion occurred at the elbow between the shut-off valve downstream of the slurry pipeline and the burner valve; all other areas remained intact. The situation is quite serious; the fragments resulting from the explosion were as long as an arm in some cases, and as big as a palm in others. The explosion occurred on the eighth floor and reached the ground on the fifth floor. Above the fifth floor, it is all steel structure; the fifth floor has a concrete floor.
It’s hard to say what was going on inside the furnace, but according to the control panel display, the temperature reading at the coal slurry pipeline was extremely high, and that section of the pipeline then exploded. I suspect it’s a procedural issue: the nitrogen purge wasn’t carried out in a timely manner, and the check valve in the slurry pipeline didn’t function properly. After oxygen purging, gases from inside the furnace entered the slurry pipeline, causing an explosion.