Problems encountered in waste heat recovery from the heating furnace of diesel hydrogenation units
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For projects in the petrochemical industry, I saw in the technical agreement a requirement that the difference in oxygen content between the exhaust gas inlet and outlet should not exceed 1%. I really can’t understand this; could you please explain it to me? Thank you
The flue gas components are CO2 (7.75), H2O (16.63), N2 (72.5), O2 (3.12), SO2 (0)
The goal is to ensure that the preheater does not leak (i.e., air from the blower cannot enter the exhaust system).
I understand the first sentence, but I don’t understand the second one. Air supply cannot enter the exhaust system; there is negative pressure in the flue – where does the air supply come from? Is there secondary air in this process?
The waste heat recovery system for heating furnaces is used to recover the hot flue gas from the furnace, introduce cold air into it for heating, thereby reducing fuel consumption and improving the efficiency of the heating furnace. The exhaust from the heating furnace is exhausted using an exhaust fan or natural draft.
If you explain it to me, I’ll understand. Air does indeed get blown in, so it’s necessary to have internal partitions; please give me more guidance