Thermal collapse of catalytic cracking catalysts
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In a catalytic cracking unit, where there is a large amount of reaction steam, does the fine catalyst powder resulting from catalyst thermal degradation escape through the regenerator or through the fractionation tower?
Let’s see how you handle it. If the environmental regulations aren’t strict, release it through the chimney; if the requirements are strict, discharge it and find a professional factory to deal with it
This is the overall trend in environmental protection these days: if desulfurization and denitration measures cannot be implemented, such facilities have to be shut down
Most of it is lost through the regenerator; a portion goes along with the catalyst to the settler and is then carried to the distillation tower
What does it mean by a large amount of steam? What about the design parameters? Adjust the steam volume accordingly based on the load of the unit; for example, reduce the steam volume during reduction operations, switch to dry gas instead of steam to prevent water from being carried in by the steam, and modify the stripping section to enable more efficient gas stripping. Each unit has its own characteristics. Check how much your per-unit cost is
What is catalyst thermal collapse? What factors is it related to? Answer: The phenomenon in which water vaporizes rapidly upon contact with a high-temperature catalyst, causing the catalyst particles to break apart, is called catalyst thermal decomposition. It is mainly related to the regeneration temperature, the water content in the fresh catalyst fed into the regenerator, the water content in the steam of the reaction-regeneration system, and the dilute-phase water spray. As can be seen from the above, the thermal collapse of the catalyst is mainly related to the regeneration temperature, the water content in the fresh catalyst fed into the regenerator, the water content in the steam used in the reaction-regeneration system, and the dilute-phase water injection; water is the key factor. If the quality of the steam is good, its impact is minimal.
Teacher, does the fresh catalyst fed into the regenerator contain water?
As long as the steam in the reaction system is free of water, it has little impact on the thermal degradation of the catalyst!
If the new agent is not properly protected inside the bag, it may contain moisture.
Generally, after fresh catalyst is added to the regenerator, about 40% of it is lost.