Temperature control issue in the synthesis tower

The methods for adjusting the temperature of the synthesis tower are roughly as follows: by adjusting the circulation rate, by adjusting the lines connected to the tower, by adjusting the cooling lines, and by adjusting the composition of the gas fed into the tower； Circulation volume adjustment: This is the most commonly used method of regulation; increasing the circulation volume lowers the temperature in the synthesis tower, while decreasing it raises it ； The advantage of this method is its rapid response and quick effectiveness in adjustment; the disadvantages are that gas takes a shorter path, the power consumption of the circulation machine is high, and as the circulation volume increases, the ammonia content in the gas exiting the tower decreases while the power consumption for cooling rises ； Tower feed line adjustment: This method generally involves increasing the circulation volume to its maximum; its adjustment characteristics are not very different from those of circulation volume adjustment ； Cold shock line adjustment: This method has a significant effect on regulating the bed layer where the cold shock gas enters; its drawback is that it is not possible to adjust the temperature of the upper insulating layer, and improper adjustment may lead to an increase in system pressure ； Regulation of the composition of the gas entering the tower: It serves as an auxiliary method for regulating the temperature in the synthesis tower; generally, the reaction proceeds slowly, so it can only be used as a temporary indicator.

This post was last edited by ZZJJAA70 on 2009-10-9 at 21:46. Methods for adjusting the bed temperature in a synthesis tower vary depending on the structure of the tower. We are a Casari shaft radial intermediate heat exchange type with cold shock. The main method of adjustment is to maintain stability once the main valve of the synthesis tower is opened to a certain degree, and to use various cooling methods to control the bed temperature

How is synthetic ammonia produced? I want to learn about it*

Methods for adjusting the temperature of the catalyst layer in the synthesis tower: ① Adjust the tower bypass valve; by opening this valve, the gas does not pass through the lower heat exchanger, resulting in an increase in the amount of gas that is preheated. As a consequence, the temperature of the gas entering the catalyst layer decreases, the reaction rate slows down, and thus the temperature of the catalyst layer drops； Conversely, the temperature of the catalyst layer can be increased. ②Adjust the circulation volume; when there are large fluctuations, I usually focus on adjusting the circulation volume, using the auxiliary valve in conjunction with it. ③Changing the ammonia content in the feed gas and the inert gas content in the system, by increasing the ammonia content in the feed gas or the inert gas content in the recycled gas, will weaken the ammonia synthesis reaction and lower the temperature of the catalyst layer. ④By changing the operating pressure, the pressure response speed increases, more reactions occur, and the temperature of the catalyst layer rises ； Conversely, it decreases. ⑤Using an electric heating furnace, this method can be employed for adjustment when the temperature gradually drops and becomes uncontrollable due to reasons such as declining catalyst activity, insufficient supply of gas, or catalyst poisoning.