How is the temperature of ammonia synthesis controlled? ? ?

The original poster is referring to the synthesis tower or the entire ammonia synthesis process – it’s important to clarify this. The overall ammonia production process involves steps such as gas generation, shift reaction, decarburization, purification, compression, and synthesis/cooling, and the temperature control requirements vary significantly across these different steps. The main raw materials for this process are natural gas and air, which are combined in a 3:1 ratio to produce hydrogen and nitrogen, from which ammonia is then synthesized.

What was said on the second floor is correct. Does the temperature of ammonia synthesis mentioned by the original poster refer to the temperature control in the ammonia synthesis unit, or to the temperature control of the entire ammonia synthesis production system?； Generally speaking, the temperature control in ammonia synthesis production mainly involves the following aspects: first, using coolers to regulate temperature, such as the cooling coils of compressors and other units as well as various coolers; second, using bypass systems to mix cold and hot media in order to control temperature ； Third, the temperature is controlled by adjusting the reactant concentration to reduce the exothermic reaction. Additionally, the process gas for ammonia synthesis comes from coal-based gas, oil-based gas, and natural gas-based gas.

The original poster’s description is too vague; it’s hard to say. You can refer to the opinions of the two people above and ask specific questions!

Regarding the synthesis tower: The ammonia synthesis reaction is an exothermic reaction, so reducing the temperature of the reaction helps to shift the equilibrium in the direction of ammonia formation. Therefore, when selecting the reaction temperature, the active temperature range suitable for the catalyst must be taken into consideration first, which is generally between 380°C and 525°C. Furthermore, for reversible reactions, the temperature at which the total reaction rate is maximum for a given composition of reactants is called the optimal temperature corresponding to that composition; thus, there exists an optimal temperature line for the reaction process throughout the entire synthesis tower. The optimal temperature continues to decrease as the reaction progresses. To this end, for this exothermic synthesis reaction, different methods are employed simultaneously to remove the heat of reaction in a timely manner, so as to keep the reaction temperature as close as possible to the optimal temperature and achieve better results. In actual production, the inlet temperature of the catalyst bed is generally kept slightly above the temperature at which the catalyst becomes active, with the maximum temperature not exceeding the catalyst’s heat resistance limit. The temperature is kept slightly lower at the beginning to prevent premature aging of the catalyst, while it can be increased appropriately later on.