On the role of refractory balls in conversion furnaces
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Each layer of catalyst in our plant’s shift converter is equipped with a layer of refractory balls on top. I would like to ask everyone about the function of these refractory balls in the shift converter. I heard that it serves to distribute the gas and prevent semi-water gas from coming into direct contact with the catalyst. I wonder if it’s this effect? Additionally, ceramic balls are installed above and below the refined desulfurization agent in the refined desulfurization tower; is this also for the same purpose? I hope everyone will feel free to share their insights!
In my personal opinion, the main purpose is to protect the catalyst from sintering at high temperatures!
The gas entering the converter may still contain some oxygen, and the combustion of this oxygen generates a large amount of heat; the role of the refractory balls is primarily to protect the catalyst from being sintered by this heat.
It makes the gas distribution more uniform and prevents flow deviation. Prevent gas from directly impacting the catalyst and causing it to become pulverized. It intercepts solid impurities in the gas, blocking the micropores of the catalyst and reducing its specific surface area. (I’m not sure if this will work.) The purpose of laying a layer at the bottom of the catalyst is to provide support for it and to prevent the catalyst from crumbling.
Supporting catalyst Distributed semi-water gas
This post was last edited by qingko on 2011-1-23 at 18:33. It’s basically as mentioned above, plus it prevents backflow of gas from causing the catalyst to be blown over. But I disagree with the 3rd floor! ! :)
I disagree with some of what Brother Lou said: 1. The lower layer serves to support the upper layer of catalysts, preventing them from being crushed when a large amount of catalyst is used； 2. Redistribute the gas to prevent flow imbalances, especially in furnaces with a large loading capacity ； 3. The upper layer serves to intercept solid impurities in the gas, preventing clogging of the catalyst’s micropores and thus avoiding a decrease in the catalyst’s specific surface area ； 4. Secondly, refractory balls have a certain degree of moisture absorption ；
This issue should have been discussed many times on the forum; you can do a search!
What was mentioned on the 4th floor covers most of it; there are just two more points: 1. Ceramic balls can prevent oil from getting in, thus avoiding contamination of the catalyst by oil. 2. When there is a small amount of water in the steam, the ceramic balls prevent the water from coming into direct contact with the catalyst (the temperature of the ceramic balls is high, allowing the water to vaporize on them).
Reply 1# wangjm to distribute the gas evenly!