What are the reasons for the increase in pressure drop across the catalyst bed? What is the maximum allowable pressure difference in your facility?
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This post was last edited by liuquan1100 on 2017-12-15 16:56. What are the reasons for the increase in pressure difference across the catalyst bed? What is the maximum allowable pressure difference in your facility?
Catalyst pulverization, coking, dust entering the catalyst bed, excessive space velocity.
1. Long-term operation at low load levels leads to uneven distribution of the catalyst. 2. An increase in impurities in the feed oil results in partial deactivation of the catalyst. 3. The filter for the feed oil becomes short-circuited, preventing it from achieving the required precision. 4. The quality of the catalyst used is inadequate; it may form bridges or be distributed unevenly. 5. The properties of the feed oil change, leading to carbon formation and coking. 6. The catalyst gets covered with a layer of deposits. 7. Over-temperature conditions occur. 8. Large fluctuations in the operation of the plant. Check the design drawings to find out how many reactors and what kind of equipment you have. Our purification reactors show a pressure drop of around 0.5 Mpa, while those used for cracking exhibit a pressure drop of around 0.12 Mpa. This depends on your design, tower diameter, space velocity, feedstock, and type of catalyst. It is related to factors such as the quality of loading; you can consult the catalyst manufacturer or the design institute.
Catalyst loading, catalyst coking, catalyst crushing, dirty feed oil, changes in the amount of recycle hydrogen
The analysis on the third floor is quite comprehensive; generally, the pressure difference control should not exceed 5 kg
The processing volume is high, and the amount of recycled hydrogen is large; this leads to catalyst coking and collapse of the catalyst bed. We currently have one set with a capacity of 0.7 and another with a capacity of 0.4. However, you might want to compare these values with your design specifications before deciding whether it’s high or not
The pressure drop is mainly concentrated in the upper layer of the catalyst, due to the high impurity content in the feedstock and the coking of olefins in the upper part of the reactor!