Why is chlorination removal necessary for the flue gas from catalyst coking regeneration in continuously regenerating reformers using domestic technology?
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Why is chlorination removal necessary for the flue gas from catalyst coking regeneration in continuously regenerating reformers using domestic technology? Why is there also an air-release dechlorination tank?
To reduce chlorine corrosion in the regenerator, the chlorinated gases from the chlorination section of the regenerator are drawn off separately at the exit of that section. After being dechlorinated in a vent gas dechlorination tank, part of these gases is used as supplemental oxygen in the coking section, while the rest is vented. This approach enables low-carbon coking and enhances the operational flexibility of the facility. This is a major advantage of this technology over other technologies.
I’ve not worked with continuous reforming using domestic processes; UOP’s systems also include this feature, as there is a need for separation due to environmental regulations
This must not be based solely on domestic technologies; foreign ones such as UOP’s technology are also used for this dechlorination process. It seems to be related to environmental regulations; there are requirements regarding the chlorine content in the exhaust gases.
The charring and dechlorination of flue gas during catalyst regeneration is primarily aimed at preventing chlorine corrosion in the process pipelines used for regeneration. Water is generated during the charring process of the catalyst, and this water carries away the chloride ions on the catalyst; therefore, the presence of chlorine in the regenerated flue gas can cause equipment corrosion. Air discharge for dechlorination is primarily driven by environmental protection requirements.
Air release without dechlorination – the water meter will be checked
This side belongs to UOP; chlorine needs to be injected during catalyst regeneration, and the flue gas will contain chlorine. Chlorine-containing flue gas causes corrosion in downstream systems, in addition to posing environmental regulations issues
The UOP one also needs to be dechlorinated! Since the regenerated flue gas contains hydrogen chloride, it cannot be directly released into the atmosphere. Now, requirements apply not only to chlorides but also to total non-methane hydrocarbons. Many plants send the regenerated flue gas through dechlorination or alkaline washing before sending it to a heater for combustion, in order to burn off the trace amounts of hydrocarbons.
It seems that all flue gases from reprocessing and regeneration need to be dechlorinated, mainly due to environmental regulations. Moreover, without dechlorination before discharge, severe corrosion will occur at the discharge point of your regeneration system; the steel structures will be corroded and damaged.
We also have a question: how are non-methane hydrocarbons generated? Thank you!