Problem of increased NO levels due to extended coking time in coke ovens
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5.5 Coke ovens: Under adjusted operating conditions, the use of coal has reduced the temperature of the exhaust gases; this has been the case for 24 hours now. Yet the online monitoring equipment shows that the NO level in the exhaust gases is still higher than it is when the ovens are operating at full capacity. Does anyone know the reason? Please let me know – I’m going crazy! The online monitoring equipment itself is working fine
Are they nitrogen oxides or nitric oxide?
What is the leakage situation in the coke ovens? Air excess coefficient?
The nitric oxide level is too high; the oxygen level is around 5 under normal conditions, but it’s now less than 7
It’s certain that there will be changes in the coke oven market, but they won’t be too severe. Previously, when the coking time was extended, the changes in SO2 weren’t very significant; however, nitrogen monoxide levels still decreased. It’s really hard to understand why they increased this time instead of decreasing
There is definitely a leak, but it can’t be done this way. The same approach is being used for the other coke oven as well, and the performance indicators there have already decreased significantly. Besides, inspections are carried out daily to check for leaks in the coke ovens; if there is indeed a leak, there should be a noticeable change in SO2 levels
Wastegas contains a large amount of nitrogen compounds
There shouldn’t be any major problems with the furnace. I just talked to the manager; he’s currently in the basement. Reducing the gas pressure doesn’t work either. At present, when the level of nitric oxide decreases, the level of sulfur dioxide increases, and vice versa. The oxygen level is 7
After reducing the gas pressure, did the suction in the side flue on the machine coke side change? If it didn’t change, there is definitely an excess of air, which is why NO levels are high.