Continuous reforming regeneration problem
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Must the catalytic oxychlorination be carried out simultaneously? Can chlorine injection for regeneration be used during black burning? Is temperature control at the inlet of calcination intended to provide the chlorination temperature or the drying temperature? What are the inlet temperatures for firing in black and white firing processes? During black firing, the temperature at the entry point is very low; it is only during white firing that the temperature is increased
The firing inlet temperature you mentioned should refer to the outlet temperature of the regenerative electric heater. First of all, it’s necessary to distinguish between black firing and white firing. Black firing is generally carried out at the beginning of operation, as the material used at that stage is black in color; if black firing is done directly, it will cause burning in the drying zone and the oxychlorination zone, resulting in high temperatures that can damage the internal components. During black firing, chlorine is usually added to the reforming feed in order to maintain the chlorine content in the system. After black firing, the chlorine content in the regenerated catalyst is tested; if it is below 4%, white firing can be carried out. When switching from black firing to white firing, it’s important to closely monitor the temperatures at various points in the regeneration burning zone to prevent a drop in temperature levels. After switching to white firing, chlorine is added during regeneration, with the amount of chlorine to be used determined based on the chlorine content curve specific to that regeneration process, and adjustments are made accordingly. Adding chlorine helps disperse the platinum metal, thereby allowing the catalyst to regain its metallic structure
Oxidation chlorination must be carried out; regenerative chlorine injection is not used in the black burning mode. I maintain the same temperature level in both the black and white burning modes
Can black firing be done using recycled chlorine injection? I know about black firing without oxygen injection. Is chlorination by oxygen necessary during the simple boiling process? Is the temperature at the inlet of the roasting stage set for the chlorination reaction?
It must be cooked without added substances; to increase the chlorine content in the catalyst, an oxygen-rich environment is required
In black burning, nitrogen is supplied at the lower part while air is supplied at the upper part, to prevent the catalyst from burning at too high a temperature and causing damage to the components inside the regenerator. Suitable for charring after initial startup and long-term shutdowns for regeneration. Normal coking is a normal burning process; air is supplied from the bottom, and the entire regenerator is in an oxygen-rich environment, which is suitable when the coke on the catalyst has already been completely burned away in the coking zone
The 6th floor is the correct answer. Additionally, both the temperature at the oxygen chlorination inlet and the temperature at the calcination inlet need to be controlled; the former is necessary to maintain the appropriate temperature for the oxygen chlorination reaction, while the latter ensures better dispersion of platinum in the catalyst under high-temperature and oxygen-rich conditions (during the calcination stage).
No chlorine is added during black firing; it is recommended to read the operating procedures carefully