Why is the sulfur dioxide level so high
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The coke oven stopped heating, and the suction force decreased accordingly; nitrogen oxides dropped from 500 to a level of just over 30, while sulfur dioxide fell from over 80 to around 60. The gas supply has been cut off – why is the sulfur dioxide level so high? Leaks in coke ovens are very rare; please explain the possible reasons. Thank you.
Since the gas supply has been cut off, the source must be a leak! !
What you said makes sense; however, upon checking the fire viewing hole, no obvious leakage at the roof was detected. It’s not that there are no omissions, but with the gas supply turned off, the drop is only this small – could there be other possible reasons? Solve.
There is no coke oven that is completely leak-proof; it’s just a matter of to what extent leakage occurs. In the past, the Coke and Refractory Research Institute conducted tests on 3.2-meter-high rammed coke ovens, and found that during normal operation the leakage rate was around 3%. When heating is stopped, the pressure in the coke oven changes significantly, resulting in a higher leakage rate. The leaked gas has not been desulfurized, so the sulfur dioxide level is higher; this value seems a bit high, but it’s still considered normal
Yes, around 15 for oxygen. Could you explain why sulfur dioxide levels are high? Also, how do you determine that the oxygen level is too high?
May I ask, where was oxygen sampled at such high levels? What was the level of oxygen sampled from the vertical flue? And how long is the coking time?
The sulfides in the gas that leaks from the carbonization chamber of a coke oven are primarily hydrogen sulfide; there is no sulfur dioxide. Only when there is an excess of air can the hydrogen sulfide that leaks be converted into sulfur dioxide. Additionally, it is necessary to consider the method used to measure sulfur dioxide in smoke; if the iodometric method is used, hydrogen sulfide that has not reacted to form sulfur dioxide will also be counted as sulfur dioxide.
If ultraviolet differential spectrophotometry is used, there is no issue of being unable to distinguish between hydrogen sulfide and sulfur dioxide.