As the temperature drops, the density of the green sleeve increases.
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Coaxial catalytic cracking. In the past two days, the density of the reactor liner has increased, and the opening degree of the reactor liner valve has grown larger. The instrument was checked several times to examine the density points, and an issue with the instrument’s display has been largely ruled out. With snowfall in the past two days, the problem of frozen wind pipes is quite serious. Both devices are loose, and the backflow points are equipped with flow-limiting orifice plates; therefore, it’s normal for them to get clogged. The sleeve distributes air, primarily serving to propel and guide it as well as to ensure a balanced distribution of the green slurry. If the allocated air volume is reduced or absent, it will inevitably hinder the fluidization of the catalyst in the front section and increase the system resistance. Therefore, under automatic control of the inventory in the stripping section, the raw catalyst plug valve will open wider to ensure a stronger driving force. Since fluidization in the rear section is not as smooth as before, the density of the slurry will surely increase while the linear velocity will decrease. Similarly, changes in the amount of loosening medium at the loosening points of each of the two devices can also affect catalyst fluidization. There are too many daily tasks at work, so I haven’t had time to examine past trends in detail. It was probably the same situation during the last snowfall, so the possibility of wear through the pressure gauge tubing is low.
We increased the flow rate of the fluidizing air in the sleeve. However, the flow rate of the fluidizing air must also be appropriate; if it is too high, it will create resistance to the fluidization of the catalyst ahead. In this kind of weather, the only solution is to enhance the condensate drainage of the wind and steam systems. The catalytic unit requires a large amount of steam at low pressure; the temperature of this steam is around 300, while the overall temperature of the system is approximately 250. The steam systems should also have drain valves enabled, so the impact is relatively small.
The problem of water freezing in the un-purified air stream is severe; now that I think about it, the bypass valve for the fluidization air in my device was set to 3.4 positions, and it’s very likely that the flow restriction mechanism of the valve has become blocked, which results in insufficient fluidization capacity and an increase in density. Once the valve is opened further, the static pressure of the catalyst will help to enhance the driving force. . . The impact of sleeve-induced air distribution is not yet that significant; the density fluctuation range is 400–600. I forgot to ask everyone to share their experiences.
Direct the purified air and unpurified air to the water separation unit, or to the dryer. There should be some improvement
The instrument lines for the inventory in our stripping section have frozen up; they’re full
Purified air is mainly used for instrument air and should be passed through a dryer; unpurified air contains a high level of moisture
“It should be connected to a dryer; the unpurified air contains too much moisture
Normal dehydration does not work well; ensuring that water stays in the tank for a certain period of time is necessary for effective dehydration. Try using timed dehydration