Reasons for the high dome temperature in the Texaco gasifier
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What are the reasons for high temperatures at the dome of the Texaco gasifier, and how can this be prevented during normal operation? I would appreciate advice from experienced colleagues
I believe the main reasons for overheating are as follows: 1. Cracks in the arch bricks cause air leakage； 2. The operating temperature of the gasifier is too high ； 3. The surface thermocouple provides inaccurate readings ； 4. Detachment of section or local refractory bricks.
I agree with what was said above; it’s also possible that wear or damage to the burner has caused the black area around the burner to become too short, which brings the flame closer to the roof.
For example, could a low load on the gasifier cause high dome temperatures?
The second and third floors provided a very comprehensive and summary-like explanation. What the original poster said about low load being not an inevitable condition for overheating of the dome is correct; high furnace temperatures occur only when there is a low load combined with an excess of oxygen, which in turn can lead to dome overheating. Specifically, this happens either because the oxygen-to-coal ratio is too high, or because the ratio isn’t too high but the slurry concentration is too low. Essentially, it is an excess of oxygen that can cause overheating. Of course, this assumes that the dome is in compliance with the process requirements, meaning there is no brick detachment or cracks…… It’s just my personal opinion; feel free to challenge it……
Slag clogging in the gasifier can cause poor airflow, which can also lead to overheating of the dome.
Reply 1# shao*chun: All the poster members have discussed this very well.,:handshake
It can be divided into two categories: large-area hyperthermia and localized temperature rise. 1. Large temperature rise: High operating temperatures cause the refractory bricks to thin out, the gaps between the bricks used in furnace construction to widen, and the castables to become suspended. 2. Local temperature rise varies depending on the situation: local peroxide formation, air leakage, and excessive temperature rise. In terms of description, it is related to factors such as coal quality and operating pressure. It’s complicated.
In reality, overheating of the arch roof is usually caused by air leakage. There are many reasons for air leakage: excessive operating time, uneven spraying towards the later stages of operation, and sudden changes in pressure and temperature that lead to the detachment of bricks. . . . . . Depending on the installation position of the burner (single nozzle), if the spray deviates and hits the arch bricks, then it’s a significant deviation indeed. In our factory, coking has occurred at the burner coil, which has caused the bricks at the furnace opening to loosen, resulting in air leakage at the flange·
If it’s the situation you mentioned, how should it be handled?