Catalytic two-stage regeneration
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With catalytic two-stage regeneration, repeated oxygen depletion followed by re-oxygenation, and a constant main air flow with increasing make-up air, does carbon monoxide levels increase or decrease? Why?
In our system, under normal circumstances, the material gets completely burned after just a few cycles in the burning tank; moreover, the main air flow rate for these cycles is quite low. Personally, I think the main air flow in these cycles serves merely as a medium to maintain a fluidized state. What we call the \"burning tank\" is actually used for those cycles. However, I’m not clear about what exactly you look like.
Yours is a pre-combustion burner tank, which belongs to the oxygen-enriched regeneration process; the hot gases then go directly into the waste heat boiler； My system is repeatedly under oxygen-deficient conditions; it then enters a state of complete oxygen-rich regeneration, and there’s also a carbon monoxide combustion furnace afterward
In my opinion, it is the increase in CO; with a high air flow rate, incomplete combustion occurs, resulting in more CO being produced. This CO then goes directly into the cyclone separator. Since the total main air flow rate remains unchanged, this means that the air flow rate used for regeneration is reduced, which in turn leads to a poorer combustion effect and increases the likelihood of incomplete combustion, potentially even causing afterburning. In terms of operation, both the primary and secondary air volumes need to be adjusted frequently. Just my personal opinion; I’d appreciate some guidance from experts.
In practice, CO levels decrease, but the reason for this is unknown
This situation depends on the burning ratios of one-repetition and two-repetition. We have a small unit with a capacity of only 300,000 tons per year; after six upgrades, it was eventually modified to use a post-combustion coking tank. The combustion in stages one and two accounts for 40% and 60% respectively, which is similar to the situation you described.