I’m not quite understanding the cooling zone of the third-generation UOP regenerator
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Is it to directly draw the burned secondary cycle gas from the outlet of the regeneration fan, cool it via air cooling, and then send it into the cooling zone? And why is it necessary to mix chlorine gas with the dryer before introducing them together into the drying chlorination area? What are the advantages of this approach over previous methods?
It is chlorine and dry gas. Also, what is the purpose of the pipeline for the nitrogen that carries the second-stage burnt gas in a continuous flow?
In the regeneration process, chlorine is generally only added in the oxychlorination section, and chlorine gas is not used for this purpose. Where exactly is the chlorine gas being added, as you mentioned? Nitrogen generally only serves to displace air for cooling purposes, right?
The lower section of the cooling zone in the regeneration tower (21R0301) serves as the chlorination drying zone. Air that has been dried by the air dryer (21L0302) is used as an exhaust gas to draw in chlorine; this mixture is then sent to the outlet of the air heater (21E0302). In the white combustion mode, instrument air is used to draw in chlorine, while in the black combustion mode, nitrogen is used for this purpose； Another stream of air is heated to ~610°C by the air heater (21E0302), mixed with air containing chlorine, and then sent to the chlorination drying section of the regeneration tower. In the chlorination and drying zone, dry hot air is used to remove moisture from the catalyst; chlorination serves to rearrange the platinum metal within the catalyst particles on the carrier particles, thereby achieving a better distribution and increasing the catalyst’s activity. It says this: this is the process for propane dehydrogenation.
I don’t really have any ideas for the question you’ve asked. However, I still have some doubts regarding what you mentioned later about the molecules being able to reorganize after chlorination. Generally, platinum metal is redispersed under high-temperature and oxygen-rich conditions; chlorine merely attaches itself to the surface of the catalyst to enhance its acidic properties, right?
I suggest you first look for the drawings of the regenerator; it seems there is no flow path from the outlet of the regeneration fan to the cooling area.
Can I take a look at the drawings first? ytibzx.com
I don’t have any blueprints; I only have this description, which is why I’m asking. Ordinary regenerators are different from this one; I don’t know why the instructions are like this.