Desulfurization circulation rate in ammonia synthesis plant

The circulation volume in an ammonia synthesis plant for desulfurization generally varies depending on the type of desulfurization catalyst used; a catalyst with a higher sulfur capacity requires a lower circulation volume, which helps to save electricity consumption. However, many catalysts claim to have a high sulfur capacity and require a low volume of solution circulation. The spray density in a typical desulfurization tower is not less than 20 m3/m2, with a value of around 35 in most cases. The circulation volume varies depending on the amount of sulfur entering and leaving the tower; the higher the amount of sulfur entering, the greater the circulation volume of the solution required. It is worth noting the importance of proper setup for the regeneration tank; generally, the regeneration time should be around 10 minutes. If this time is too short, the hydrogen sulfide absorbed in the solution won’t have enough time to be oxidized and will continue to circulate in the solution, leading to a deterioration of the desulfurization fluid and creating a vicious cycle. Therefore, if the hardware is not suitable, it is necessary to modify the equipment. If the desulfurization efficiency remains poor even after the equipment is properly set up, another type of catalyst can be used

:Handshake: The spraying volume for handshake should be calculated at 50 cubic meters per square meter of filler. :handshake :handshake

Hello from upstairs – 50 cubic meters of spray per square meter seems a bit high, doesn’t it? If the imported material has a low sulfur content, it will result in excessive electricity consumption; especially during the desulfurization process, the power usage is astonishing

I agree with you; if the circulation rate is set at 50 cubic meters per square meter of packing, what’s wasted is not only electricity but also the investment in equipment. Furthermore, if there are three layers of packing in the tower, is it a factor of 3, or does one only need to calculate for one layer of packing? Typically, the spray density is set at 30–40 cubic meters per square meter, with this value determined by the hydrogen sulfide content in the gas entering the tower. Higher sulfur levels require a larger circulation volume, while lower sulfur levels allow for the use of a smaller, more economical circulation volume. It is only used in packed towers; vertical sieve plate towers and empty-tower spray systems have corresponding selection criteria.