What is the reason for the high hydrogen sulfide level in front of the desulfurization tower?
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I need help. Our plant has 5.5-meter coke ovens, and in recent days the hydrogen sulfide level in front of the tower has reached 17.4 g/NM3. There are no significant fluctuations in the parameters of the coal used. What other factors could be causing such high levels of hydrogen sulfide in front of the tower?
Excessively high sulfur content in the coal fed into the furnace is the main factor affecting the hydrogen sulfide content in the gas.
If there’s no change in the blending coal, then it’s likely an error in the testing
The accuracy of the tests is important; the test results for the coal fed into the furnace as well as those from before the tower must both be verified.
The hydrogen sulfide level in front of the tower is only related to the sulfur content of the coal fed into the furnace, right?
1. First, rule out testing errors. 2. The specifications for the coaling have not changed; please check the sulfur content in the coke. If the sulfur content in the coke decreases, it means that the sulfur conversion rate has decreased, and more hydrogen sulfide is produced as a result. This could be an issue specific to certain types of coal, especially those with high volatility and high sulfur content
Coal blending composition, coke oven operation, electric capture and primary cooling!
I agree with the opinion from floor 8: an occasional distortion in the data is not a problem. After ruling out errors or mistakes in testing, if it’s not caused by issues related to coal, then it’s necessary to check whether there is any blockage in the spraying system of the primary cooler, as well as whether the electric tar catcher is operating properly. This can be verified by checking whether the parameters after passing through the blower are normal. In addition, check whether the gas pre-cooling system is operating properly, and whether there are any changes in the hydrogen sulfide content in the gas after the pre-cooling tower; it is very likely that the hydrogen sulfide levels after the pre-cooling tower are also abnormal.