Pressure drop problem in hydrogenation reaction (2) Dense phase filling
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It was originally loaded by a common method, and the bed pressure drop was around 0.06Mpa. Due to the need for transformation, future catalysts will be packed with dense phase. The original packing density was 0.68~0.74 (all are manufacturer's data, let's assume 0.72). Now the density of dense phase packing is expected to be 0.78~0.85. Personally, I think that the pressure drop will definitely increase when other conditions remain unchanged, but I don't know how much it will increase. Please provide guidance and provide some data with relevant experience. Nothing else, thanks for the rating! :handshake
I couldn't access the Internet during the meeting yesterday. I just found a post on Baidu (also from Haichuan! ): Thank you Haichuan. This post was last edited by Yumu at 2009-3-4 08:31 ]
Dense phase filling can increase the density of the catalyst bed by about 15%. The initial pressure drop of the dense phase filling catalyst is much greater than that of bag filling, which is generally 1.5 to 2.5 times that of bag filling. However, due to the uniform catalyst distribution and improved fluid distribution, the pressure drop in the reactor is usually lower during subsequent operations. -----Selected from "Hydrotreatment Process and Engineering" by Li Dadong
Haha, the difference between what is said above and what the poster said on Baidu is not small... 2.5 times is an increase of 1.5 times. It seems that it depends on the actual operating data. No wonder design institutes only dare to design according to insurance data.
The volume difference between dense phase filling and ordinary filling is about 1.2-1.3 times. Their choice mainly depends on whether the pressure difference between the inlet and outlet of the circulating hydrogen compressor can be tolerated. Generally, new device designs (reactors are large enough) use ordinary filling. In the case of old device expansion and transformation, due to the increase in air speed and the need to install more catalysts, dense phase filling is used to solve this problem.
I don't agree with what you said above. Dalian Petrochemical's 3 million-ton residual oil hydrogenation reactor is the largest reactor in China and uses dense phase filling.
This statement still makes sense. For example, in the design of trays, new ones generally use different float valves. If they are renovated, they have to consider high-efficiency trays. The statement above also makes sense. After all, the larger the reactor, the higher the investment. The larger the reactor, the more prominent this problem becomes. Depends on future development plans
What the people above said make sense. It seems that the design parameters must be carefully considered. It was originally a matter of cramming. Although the forum has rich knowledge, it is a bit slow after all. Only by doing your homework can you use it when you use it... It is easy to get a conclusion, but it is very difficult to get a correct conclusion. It is quite difficult! (Is the concept of this sentence the first of its kind? :lol)