How to deal with partial scaling at the catalyst sampling port?
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I. Problem: In the catalytic cracking MIP process, the sampling ports for the balance agents on the regeneration inclined tubes are mostly clogged; only a small number of channels remain open. There is a risk that they will all get blocked over time, making sampling difficult. What effective methods are there to clear these blockages? PS: Loose air and loose steam can be used for backblowing at the sampling port; the loose air with a orifice plate is used after sampling. It is initially suspected that water vapor in the air is causing fouling of the catalyst. Ventilation or steam is provided between the two valves at the sampling port. II. Methods already considered: 1. Using loosening air (via the orifice plate bypass line) to push upward – the effect is poor ； 2. Steam at 1.0 Mpa is being used for backpressure; it hasn’t been tried yet, as there’s concern it might affect fluidization ； 3. Using an iron rod to poke it has the advantage of removing scale, but the downside is that after cleaning, the catalyst may be ejected and cause injury; it was considered to loosen and counteract the pressure while pulling it out, slowly withdrawing the iron rod behind the primary valve, allowing air to push back for a moment before closing the valve again; the iron rod was then pulled out, but this has not been tried yet ； III. Are there any other safe and reliable ways to get help?
Under normal conditions, loosening steam is introduced for loosening, and the external vent remains open; blockage basically does not occur. Stop the steam supply when sampling. The steam keeps flowing, so the possibility of it containing water is relatively low. Also, can air be introduced here? It’s quite close to the lift pipe.
If you can’t counterattack, dive instead and keep the counterwind going.
That area is usually clogged mainly by steam, catalyst, and sludge; it doesn’t become too hard. We open the valve a little, then tap on it. If that doesn’t work, we use a thin steel rod to push things through. When doing this, be sure to pay attention to the direction of the wind, and it’s best to wear protective gear for your head.
If it gets blocked, it needs to be dealt with as soon as possible; once the material hardens and burns up, there’s really no solution left. The initial treatment involves using fine steel bars with a diameter of 8–10 mm; it is important to pay attention to safety. Once the treatment is complete, high-temperature catalysts are produced.