Desulfurization issue
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Our plant uses wet desulfurization, with JDS as the catalyst. Sections 1 and 2 use concentrated ammonia and soda ash as alkali sources, respectively. There is no gas pre-cooling tower for desulfurization; the temperature of the gas entering the desulfurization tower is around 36°C. Due to some blockages in the cooler, the temperature inside the tower reaches around 40°C, and desulfurization is carried out in two stages. The total hydrogen sulfide content in the gas is 15 g, and the required level after desulfurization is 150 mg. The total alkalinity is around 0.35, and the catalyst content is about 100 mg. The flow rate of the solution and the amount of compressed air remain unstable even after adjustment; I would like to ask fellow enthusiasts how it is possible to ensure stability under these conditions.
The temperature during desulfurization at your facility is a bit high, which results in poor desulfurization efficiency. Additionally, the lack of a pre-cooling tower prevents the removal of naphthalene; this can lead to equipment blockages, and naphthalene also affects the performance of the catalysts
Is there a regeneration tower? Under the current circumstances, it is best for you to: first, keep the temperature of the initial cooler as low as possible; second, avoid using minimal recirculation of air fans; and third, maintain a stable flow rate for the mother liquor circulation. Fourth, it is important to determine whether compressed air is supplied separately; otherwise it will have a significant impact. It is best to ensure a pressure of 4.5–6 kilograms and an airflow rate of 1500 m³/h. It is best to supply it separately. Reduce the temperature of the concentrated ammonia solution and the soda ash solution added.