【Q&A Question 042】2016.06.01
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【Q&A Question 042】June 01, 2016: What are the reasons for the collapse of the catalyst bed? The answer key will be available after responding; scoring is based on addressing the key points. 1. The raw material contains a large amount of free water, and the vaporization of this water causes the catalyst to break down. 2. The catalyst packing is not effective, resulting in an uneven bed structure; over time, local collapse may occur. 3. The catalyst has poor strength, and the packing of the support structure at the bottom of the catalyst is improper, resulting in catalyst migration; it may even enter the cold hydrogen tank and cause collapse. 4. Problems with the catalyst support plate, such as broken screens or fractured support beams.
Catalyst packing (degree of compactness, number of magnetic balls and columns, etc.), excessive space velocity leading to catalyst fragmentation, damage to the internal components, uneven distribution by the inlet distributor, and so on – there are too many issues
The raw material contains water, and it is not dried thoroughly
Reason: 1. The catalyst was not packed tightly during installation； 2. The filler at the bottom of the reactor was not properly treated, resulting in leakage. 3. The catalyst has poor resistance to erosion, causing it to break down into powder
This post was last edited by wangld on 2016-6-1 07:58; the catalyst loading does not yield good results； The catalyst has poor strength, and the support at the lower part of the catalyst is not properly arranged, which leads to catalyst migration; it may even enter the cold hydrogen tank and cause collapse ； There is a problem with the catalyst support.
1. The raw material contains a large amount of free water, and the vaporization of this water causes the catalyst to break down. 2. The catalyst packing is not effective, resulting in an uneven bed structure; over time, local collapse may occur. 3. The catalyst has poor strength, and the packing of the support structure at the bottom of the catalyst is improper, resulting in catalyst migration; it may even enter the cold hydrogen tank and cause collapse. 4. Problems with the catalyst support plate, such as broken screens or fractured support beams.
Excessively high gas velocity leads to excessive pressure on the catalyst bed, catalyst contamination and coking, high pressure drop in the catalyst bed, and damage to the reactor’s internal components
1. The feed contains a large amount of water. 2. The catalyst is not filled properly, resulting in uneven density. 3. The chain-like catalyst breaks, resulting in a decrease in porosity. 4. The catalyst has low crushing strength. 5. The support at the lower part of the catalyst is not filled properly. 6. Problems have occurred with the catalyst support plate and support beams.
The filling density does not meet the requirements during filling; the ceramic balls are not filled properly; the operating temperature is too high, resulting in catalyst coking due to excessive temperature
1. Collapse of the catalyst bed 2. Formation of a layer on top of the catalyst bed 3. Severe scaling on the upper distribution plate 4. Serious damage to the bed support structure