Catalytic cracking loose media everywhere?

The loosening point of the standpipe to be regenerated should be steam for the upper part, industrial air for the lower part, steam for the cone loosening, air for the loosening point of the regeneration inclined pipe in front of the slide valve, steam after the slide valve, steam or wind for back blowing of the regenerator combustion oil nozzle, and wind for other back blowing. This setting is to prevent a large amount of wind from flowing into the settler and causing the system to pressurize, and a large amount of steam from flowing into the regenerator to cause the catalyst to break or even partially muddy to stop fluidization.

That is to say: Use steam as much as possible for loose points related to the settler, and use non-purified air for loose points related to the regenerator.

The above is quite detailed. During the start-up process, all loose points must be replaced with industrial air to prevent condensation and water. After the air is removed, they must be removed separately.

The one connected to the settler must use steam

In the catalytic cracking unit, what are the loosening media used when the standpipe to be regenerated is loose, the regeneration inclined pipe is loose, and the various loose points on the regenerator are shut down and started? Why is it used this way? We use steam and industrial wind to regenerate the inclined pipe, and the regenerated inclined pipe also has loose points of steam and industrial wind. The principle of use is that industrial style should be used first where industrial style can be used. There are two reasons: 1. Reduce energy consumption 2. Reduce catalyst hydrothermal deactivation. However, when using wind, it is necessary to prevent the wind from flowing into the settler and causing serious accidents. If it is possible that the falling wind will blow the loose points in the settler, use steam to loosen them.

The loosening point of the standpipe to be regenerated should be steam for the upper part, non-purified air for the lower part, steam for the cone loosening, air for the regeneration inclined pipe before the slide valve, steam after the valve, steam or wind for backflushing of the regenerator combustion oil nozzle, and air for other backflushing. This setting is to prevent a large amount of wind from flowing into the settler or other oil and gas locations to cause a vicious combustion and explosion accident, and a large amount of steam from flowing into the regenerator to cause the catalyst to break or even partially muddy to terminate fluidization.

In layman's terms, the regeneration system should prevent oil and gas from flowing into each other. In places where oil and gas are present in explosions and other accidents, steam must be used as a loosening medium. Loosening air is used in the scorching tank, the waiting inclined tube and the regenerator. This post was last edited by oxygenhust on 2009-3-5 15:44 ]

1. Steam should be used as medium for loosening of the standpipe to be regenerated and the loosening medium of the inclined pipe for regeneration. It is not agreed that "the loose point of the standpipe to be regenerated should be steam at the upper part and industrial air at the lower part. At the loose point of the regeneration inclined pipe, use air in front of the slide valve and steam after the slide valve." Although steam is not suitable for The catalyst has an impact, but it can prevent air from being brought into the reactor. A small amount will not cause danger. It is best to avoid it. At the same time, it will increase the increase of N2, O2, CO2 and other components in the dry gas, and increase the energy consumption of fractionation towers, stabilization towers, air compressors, etc.； 2. Use non-purifying air to loosen the regenerator system. ； 3. At start-up, during the heating period of the two vessels, non-purified air must be used for all backflush before turning on the main fan to prevent the main fan from blowing up the catalyst and blocking the orifice plate at the loose point. After the heating of the two vessels is completed, change the air back to steam before switching the steam seal and removing the large blind plate of the oil and gas line.

Agree with the above moderator suggestions. Some situations can be analyzed in detail. The key is not to affect operation and adjustment, but also to pay attention to safety.

The loosening point of the standpipe to be regenerated should be steam for the upper part, industrial air for the lower part, steam for the cone loosening, air for the loosening point of the regeneration inclined pipe in front of the slide valve, steam after the slide valve, steam or wind for back blowing of the regenerator combustion oil nozzle, and wind for other back blowing. This setting is to prevent a large amount of wind from flowing into the settler and causing a vicious accident in which the system is pressurized, and a large amount of steam from flowing into the regenerator, causing the catalyst to break or even partially terminate the mud and fluidization into the settler. All steam must be used.

Use steam for loose points associated with the settler and pressurized air for loose points associated with the regenerator to prevent clogging.