What causes the increase in pressure difference in the hydrogenation reactor of a hydrogen production plant?
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We operate a dry gas hydrogen production plant; in the raw material purification section, the pressure difference across the cobalt-molybdenum hydrogenation reactor increased from 0.01 to 0.1 MPa over a period of about two days. I checked the recent temperature controls, and they were all within the specified limits, with no significant changes in the production load as well. Furthermore, as the pressure difference in the hydrogenation reactor increases, the outlet pressure of the feed gas compressor also rises accordingly. I would appreciate it if experts could give me some advice. Is it due to the hydrogenation catalyst? Is there a solution?
First, the impurity content in the raw materials is high; for example, coke powder and fine catalyst particles accumulate on the surface of the hydrogenation catalyst, resulting in an increase in the pressure difference across that catalyst； Secondly, the raw materials may contain isoprene, which condenses and cokes in the hydrogenation catalyst, resulting in an increase in the pressure differential across the catalyst.
Our pressure drop will also increase. But it won’t happen that quickly; usually, it takes 4 to 5 years for the pressure to drop to 100 KPa, and then it’s fine once the top part is removed. It’s all black or gray in color
Is there any way to deal with it? Or are there any ways to slow down the increase in pressure difference?
First, a water washing tower is added before the raw material enters the compressor to remove the fine powder contained in the raw material. Second, the mesh size of the filter screen at the inlet of the raw material compressor is increased appropriately to capture impurities as much as possible.
Check the conditions of the raw gas samples from a few days ago – has its density increased? Has there been any variation in the reactor temperature? Take samples at the reactor outlet to assess the hydrogenation effect
The same is true for the hydrogen production and hydrogenation reactor in my facility; the feed gas is mainly coking dry gas. From February 7 to March 9, 2016, the pressure difference reached 0.3 Mpa, and this increase in pressure difference occurred in a stepwise manner – half a kilogram could be added to it within just one day. What exactly is the reason for this? Components of the raw material gas in my system: H2, C2, C3, propylene, isobutane, n-butane, n-isobutylene, trans-butylene, cis-butylene, C5, N2, CH4, H2S, CO. 27.09, 16.34, 3.88, 2.79, 0.68, 1.56, 0.83, 0.15, 0.09, 0.16; 13.78, 32.65, 10, 0
https://wenku.baidu.com/view/264ca9117c1cfad6185fa78e.html Relevant literature, for reference only
Are there any analyses of the raw materials and products? Please share them. I think it’s very likely that there are fluctuations in the properties of the raw materials, such as olefins and metal impurities. It will cause
Hello, has the problem been resolved?