The issue of reverse pouring during the commissioning of ammonia synthesis
Thread Content
During the startup of the ammonia synthesis tower, before introducing electric heaters, the temperature can be increased by using backflow steam. There are currently two methods for this: First, a certain liquid level is established in the boiler first, after which steam is introduced from the steam pipeline system to further heat the water inside the boiler, thereby heating the gas exiting the tower and raising its temperature. Second, steam is introduced directly from the steam pipeline network into the boiler; after heating the gas exiting the tower, a certain boiler liquid level is established. I would like to ask, what is the difference between these two methods? Which one is generally used, and why?
The first option is better, as the liquid level is established first and then steam is added, allowing for easier control of the heating rate; moreover, the boiler and piping system require a preheating process. This post was last edited by *aoye613 on 2009-3-12 09:36]
The first method should be adopted, as the heat transfer coefficient of steam is low, and its ability to heat high-pressure gases is inferior to that of hot water.
Could the friend upstairs explain it in more detail? It would be best to have practical examples