What desulfurization process is used in the production of small-scale nitrogen fertilizers?

1. Ammonia-release water desulfurization is employed, that is, the synthetic purge gas is directly fed into a packed tower (filled with saddle-shaped ceramic rings). The ammonia titration is between 8 and 12. 2. The sulfur content in the raw coal should be kept below 0.5%. 3. Utilize the annual major maintenance to remove and clean the ceramic rings of the packing tower.

Tannin-based desulfurization is a good option – it requires low investment and is suitable for small and medium-sized nitrogen fertilizer manufacturers. From what you’ve described, there seems to be an issue of tower blockage in your facility; this is likely not related to the choice of desulfurization process. There are many reasons that can cause tower blockage, such as high dust content in semi-water gas, or the accumulation of dirt within the tower over time due to inadequate cleaning by the washing systems. It is recommended to first identify the cause of the tower blockage

Our factory uses tannin for desulfurization, with good results.

Tower plugging in the semi-discharge process is indeed a troublesome issue. In my opinion, to reduce tower congestion, the focus should not be on desulfurizing agents. The focus should be on putting more thought into the optimization of processes, equipment, and operational management. For example: 1. Ensure proper and stable operation for the dust removal and temperature reduction of semi-water gas. (The voltage for electrostatic dust removal is 55–60 KV) ； (Semi-water gas temperature less than 35 degrees) 2. Strengthen the management of dosing, regeneration, and sulfur melting processes to ensure that the suspended sulfur level is below 0.5 g/L. 3. The alkalinity of the desulfurization solution should be kept as low as possible, as long as it still allows the process to function properly, in order to reduce the formation of by-products. 4. The liquid-to-gas ratio in the desulfurization tower tends to be high rather than low. 5. Improve the filtration of desulfurization liquid and the clear liquid from the sulfur melting tank to enhance purity. 6. The height of the packing layer in the desulfurization tower should be less than 5 M per layer. 7. The pore size of the liquid distributor plates in the desulfurization tower, as well as the gas demisting section, are prone to clogging; careful inspection and modification are required when the tower is shut down. :lol :handshake

I agree with what was said above. But nowadays, some factories are constrained by technical processes and equipment limitations; moreover, there’s the issue of irresponsible work attitudes among some on-site workers. No matter how well something is planned, these people act one way in front of others and another behind their backs – I really hate such people. In this case, it is necessary to replace the catalyst with one that is less likely to cause tower clogging. There is a catalyst known as the DDS catalyst; I’m not sure if you’ve heard of it. Under semi-deactivation conditions, if desulfurization is carried out under the same conditions, its efficiency should be comparable to that of other catalysts. However, its biggest advantage is that it does not cause blockages in the tower. When operating under the same conditions, it is definitely superior to other catalysts in terms of preventing tower blockages. It’s not necessary to use it, but it’s worth learning more about it.

The problem of tower blockage due to semigas desulfurization is mainly caused by sulfur failing to precipitate from the solution; the R&D institute of Nanhua Company already possesses the technology to prevent tower blockage.

The phenomenon of tower blockage due to semi-water gas desulfurization is common in ammonia synthesis production. The fundamental cause of tower blockage is the incomplete regeneration of the desulfurization solution and the inadequate separation of sulfur from it.