Does anyone know what effect the temperature in the space above the furnace has on the N2 content in coke oven gas?
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As the title says! Is there more N2 at high temperatures or at low temperatures? Has anyone studied this area? Also, what exactly is the relationship between N2 and the amount of dry coal?
Coke oven gas contains very little N2; it should have nothing to do with the space above the furnace
It can be said that the temperature of the space above the furnace has little effect on the nitrogen content. For example, increasing the standard temperature raises the temperature of this space, but the nitrogen content remains unchanged. However, the nitrogen content does influence the temperature of the space above the furnace to a certain extent; a high nitrogen content indicates more air entering the carbonization chamber. The entry of air leads to the combustion of raw gas, which in turn increases the temperature of the space above the furnace. Additionally, the nitrogen content is not only related to the sealing of the coke oven but also closely associated with the coking time. As the coking time increases, the amount of raw gas per unit of time decreases, and with the same amount of air entering, the nitrogen content rises. Moreover, as the coking time increases, the amount of raw gas produced at the end of coking is very small; under the same collector pressure, it becomes easier for more air to enter
Friends on the 3rd floor, our company recently reduced its production volume, going from 144 furnaces to 100. However, the concentration of N2 gas has increased by 2-3% compared to before. We have also lowered the standard temperature by 10 degrees, and this has a significant impact on the subsequent production of methanol. I’m not sure how to avoid this problem. Please advise!
As coke production decreases, an increase in nitrogen content is inevitable. The only measures that can be taken are to improve the sealing of the coke ovens to prevent air from entering, such as sealing the coal loading ports and oven doors. Additionally, if the coking process takes too long and very little raw gas is produced toward the end of coking, it may be possible to close the bridge tube flaps in order to cut off the connection between the carbonization chamber and the gas collection duct; this also helps to maintain the pressure inside the carbonization chamber. However, this approach is relatively complicated to implement, and stricter management is required
I agree with the opinion from the 3rd floor; the nitrogen in gas is mainly introduced from air, with very little ammonia undergoing decomposition reactions.
I agree with what was said above – the nitrogen in question mainly comes from the air