May I ask about the flow of the energy recovery system for the catalytic unit in the second-stage regenerator?
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If the catalytic unit operates under a two-stage regeneration system, with oxygen-poor regeneration in the first stage and oxygen-rich regeneration in the second stage, please explain the specific process regarding how energy recovery devices such as the carbon monoxide furnace, exhaust gas turbines, and waste heat boilers discharge emissions
The catalytic unit operates on a two-stage regeneration system: the first stage is oxygen-poor regeneration, while the second stage is oxygen-rich regeneration. As you mentioned, the flow is as follows: three-spinner outlet – carbon monoxide furnace – flue gas turbine unit – waste heat boiler – chimney. The use of this two-stage regeneration system in catalytic units has been common in China for nearly thirty years; older units discharge flue gases from the first and second stages separately, whereas newer units combine the flue gases from these two stages. To prevent overheating at the inlet of the flue gas turbine, a carbon monoxide furnace is installed.
Will installing a carbon monoxide burner in front of the flue fan to recover chemical energy cause the flue gas temperature to become too high? As you mentioned, a carbon monoxide burner is installed to prevent overheating at the inlet of the flue fan; however, after the carbon monoxide is burned, heat is released, which shouldn’t it increase the flue gas temperature further? It should be placed behind the flue fan instead
Two regenerators are equipped with flue gas mixing incinerators; the temperature of the mixed flue gas can reach 900–1100 degrees. After heat is extracted by the boiler to lower its temperature, it enters the flue gas exhaust fan. Typically, it is Yanshan 2 million catalysis.
Advanced boilers first recover thermal energy, but at the same time they lose some of the pressure energy, which reduces the capacity of the subsequent exhaust fans to do work. Is there currently any solution that allows the flue gas to be fed directly into the exhaust fans at high temperatures?
In the current process, the regenerated flue gas exits the regenerator and enters the three-spinner. After passing through the three-spinner, it splits into two paths: one leads to the double-acting slide valve, and the other leads to the flue gas fan. After passing through both the flue gas fan and the double-acting slide valve, the gas enters the waste heat boiler, from where it is finally discharged into the chimney. Under normal conditions, the butterfly valve at the inlet of the flue gas fan is fully open, with the regeneration pressure being controlled by the double-acting slide valve