What is an appropriate temperature to maintain for the tower walls
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The last edit to this post was made by TH373637 on 2011-6-21 at 23:54. The design temperature for the walls of ordinary medium-voltage towers is below 150 degrees Celsius, with the ultimate temperature being below 200 degrees Celsius. It has been suggested that increasing the tower wall temperature can raise the catalyst temperature around the inner perimeter of the inner basket, thereby keeping the reaction within an optimal range. In my opinion, it’s better not to increase it, as the tower walls are the components subject to the highest levels of stress during production; they need to be given special care, and we shouldn’t prioritize other factors over them. It’s better to keep it around 100 degrees; that’s the upper limit. A better insulation layer for the inner basket might help prevent uneven catalyst temperatures; special attention should be paid to the tower wall between the two.
The temperature of the tower wall must not exceed 150°C; temperatures above this level are dangerous. At 180°C, the tower wall can be damaged, and phenomena such as carbon precipitation and nitriding can occur in the material. It is strictly prohibited to allow the temperature of the tower wall to rise above 180°C
The design temperature for the tower walls is below 150 degrees; the main purpose of this is to protect the high-pressure outer cylinder. This outer cylinder can withstand pressure but not high temperatures. When the temperature of the tower walls exceeds this limit, carbon precipitation, nitriding, and hydrogen embrittlement may occur, thereby compromising the service life of the high-pressure outer cylinder.
So, when it comes to addressing process efficiency and safety, it is indeed right to pay attention to safety.
Currently, the process temperatures in various factories are generally kept below 150 degrees.
Reply to 1# Ammonia Synthesis Expert: Our plant keeps the temperature below 150 degrees; under normal operations it is around 130 degrees. Temperatures above 150 degrees can easily cause changes in the material properties
The medium pressure is generally kept below 150 degrees, while the low pressure is usually kept below 200 degrees. Excessively high temperatures pose a risk to the material of the outer cylinder; they can cause hydrogen embrittlement, and higher requirements are placed on the material used in its construction. Therefore, temperature must be strictly controlled.
The design temperature is generally 200 degrees; hydrogen corrosion occurs when this limit is exceeded； It is generally kept between 120 and 150; it is not possible to eliminate the impact on the temperature of the catalyst basket, but this impact can be reduced.
It would be great if the performance of high-temperature materials could be improved. After working in an industry for a long time, it’s easy to develop fixed mindsets.
Reply to 9#: It doesn’t matter which side it is. The temperature of the tower wall in our plant’s synthesis tower is kept below 146 degrees; the outer wall of the tower cannot withstand high temperatures, as high temperatures can easily lead to hydrogen embrittlement. When raising the temperature in the heat exchanger, keep the pressure at 1.4 MPA and the temperature below 38 degrees
Reply to 9#: It doesn’t matter whether it’s on the left or right; improvements to the materials are likely also under consideration, though cost is an issue. It seems that opinions are more or less similar – one should adapt to local customs, as each place has its own characteristics; therefore, communication becomes important.