Thiamine section resistance
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The back pressure of the gas engine in our plant is between 170,000 and 200,000 Pa; it features a tubular heat exchanger and a spray-type saturator. The resistance in the thiamine production section fluctuates between 3,000 and 3,800 Pa, and installing a water seal doesn’t have any effect. Personally, I think it may be related to incomplete washing of the saturator and the accumulation of nitrate. However, since the washing is carried out according to standard procedures, each time the washing time (about 50 minutes) and the amount of water used for washing (the volume of the mother liquor reaching around 1.8 m after washing) are taken into account. How can I tell if the washing is thorough? What other reasons could there be for the high resistance in the thiamine production section? How to solve it? I invite all fellow sailors to share their insights.
The preheater tubes may become clogged with impurities, leading to increased resistance. There should be no problem with the saturator, as it has always been operated in accordance with the procedures
The gas contains high levels of impurities. It is related to coking, and it causes blockages in the preheater
It is recommended to conduct tests in stages to determine whether it is the saturator resistance or the preheater resistance that is high. If the saturator has high resistance, check the acid addition procedure. How is the acid addition regime specified? How often is deep acid addition carried out? If the preheater resistance becomes too high, it has to be replaced.
Thank you all for your insightful comments. I recently found out that our preheater is equipped with bypass pipes, and their size is sufficient; therefore, the resistance shouldn’t mainly stem from this aspect. After washing, the absorption chamber and crystallization chamber of the saturator generally ensure that the wall surfaces feel at a normal temperature, with no cold spots; there should also be no buildup of nitrate, so it can be considered that washing is sufficient. But the resistance is quite high. It was mentioned that there might be nitrate buildup at the gas inlet, and the areas through which the gas passes could also become blocked. Could this be the reason? How to handle it?