The consequences of excessively raising the regeneration temperature and increasing the excess air volume
Thread Content
In catalyst regeneration and power recovery from flue gas turbines, increasing the regeneration temperature and raising the excess air volume or using oxygen-enriched air (increasing the oxygen partial pressure) are highly effective in accelerating coking and reducing the carbon content in the catalyst. However, in conventional single-stage regeneration methods, excessively raising the regeneration temperature and increasing the excess air volume can lead to the following adverse effects: 1: Due to coking, the presence of water or water vapor, along with high regeneration temperatures (>730 degrees Celsius), exacerbates the hydrothermal deactivation of the catalyst. 2: There is excess air in the flue gas, increasing the energy consumption of the main fan. 3: A higher amount of excess oxygen can only be achieved by using CO as an oxidizing agent or by employing non-catalytic high-temperature regeneration techniques; otherwise, if CO is not completely burned in the dense-phase regime, severe secondary combustion can occur in the dilute-phase region, and improper handling may lead to equipment damage.
It’s not a complete overview; everything has its advantages and disadvantages. The key is to determine whether the advantages outweigh the disadvantages or not. New catalytic processes and catalysts can withstand higher temperatures.
:beauty: 2# jingpeng
High-temperature oxidation damage to acceleration equipment
Both single-stage complete regeneration and coke drum regeneration can use this mode; the regenerator temperature is controlled by external heat extraction. This mode maintains the main fan, exhaust fan, and regeneration flue systems in their optimal operating condition, thereby maximizing power generation by the exhaust fan while making full use of the regenerator’s coking capacity – it is suitable for situations with low processing volumes.
OP, could you explain what you mean by \"otherwise, if CO is not completely burned in the dense phase, severe secondary combustion can occur in the dilute phase\"?