Are there differences in the concentrations of SO2 and NOX in the exhaust gases produced across different coking cycles?
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I read online that adjusting the coking cycle of a coke oven leads to changes in the temperature of its combustion chamber, which in turn results in changes in the heating intensity. The shorter the coking cycle, the higher the heating intensity and combustion temperature; the greater the exhaust gas flow rate, and the higher the concentration of nitrogen oxides. Conversely, the lower the exhaust gas flow rate, the lower the nitrogen oxide concentration.” I think that besides nitrogen oxides, it probably has a significant impact on SO2 concentration as well, right? Has anyone considered this issue?
First, it’s necessary to figure out what causes SO2 to be produced, and then analyze it! Generally, SO2 comes from two sources: 1, poor purification of coke oven gas ； 2. Leakage between sections of the coke oven body
In other words, the generation of SO2 has no direct relationship with temperature; therefore, different coking cycles don’t have a significant impact on the SO2 concentration, right?
Approximately 5 to 6 cubic meters of waste gas are generated per cubic meter of coke oven gas burned; therefore, from the perspective of operating costs, it is more reasonable to carry out desulfurization as part of the advanced purification of coke oven gas, that is, desulfurization should be implemented at the source of the coke oven gas
I’m sorry, I’m just curious whether there are differences in SO2 levels in exhaust gas across different coking cycles; I haven’t considered the issue of desulfurization yet.
This post was last edited by hotboy3327 on 2017-12-27 at 22:35. The length of the coking time has an impact on SO2 levels: as the coking time increases, the refractory bricks in the furnace contract and the gaps between them widen; especially when iron components are not properly managed, large-scale leaks can easily occur. Furthermore, the coking time is prolonged; toward the end of coking, air inevitably enters the carbonization chamber, burning the graphite in the brick gaps. Additionally, because the coking time is long, the heating rate is slow, and the formation rate of new graphite is also slow. Wastegas enters the combustion system, resulting in a significant increase in SO2 levels. An increase in coking time necessarily leads to a decrease in NOX levels, as the flame temperature drops, reducing the formation of high-temperature NO
Experience shows that a coking time of 36 hours is the minimum value