How to ensure stable operation of desulfurization during high-temperature seasons

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With the arrival of the hot summer weather, some desulfurization units have begun to show clear signs of operational difficulties: higher temperatures in the desulfurization system, occasional spikes in hydrogen sulfide levels, a decrease in volatile ammonia, and an increase in the water content of the foam. To ensure the desulfurization system can survive the summer safely, we still need to carry out some preparatory work in advance to guarantee its reliable and stable operation. Regarding equipment: 1. Clean the heat exchanger in advance: Make sure to clean both the hot medium side and the cold medium side; otherwise, the performance may not be good and the desired results will not be achieved. Chemical cleaning can be carried out when necessary to remove salt crystals, which facilitates heat transfer. 2. Regeneration system: The ejector should be inspected and cleaned in advance to ensure adequate regeneration and maintain the stability of the desulfurization solution’s performance ； 3. Additionally, those using supplementary compressed air should pay attention to cooling the compressed air and removing oil from it, in order to avoid causing unnecessary problems for the desulfurization system. In terms of process: 1. High system temperatures and large temperature differences lead to the presence of liquid in the system, which results in higher hydrogen sulfide levels after benzene washing. In such cases, it is necessary to promptly remove and recycle the liquid from the gas pipeline, thereby reducing the amount of salts that enter the ammonium sulfate system and controlling the increase in hydrogen sulfide levels thereafter. 2. When the amount of volatile ammonia is low, supplement with qualified purchased ammonia solution in a timely manner or increase the amount of circulating ammonia solution sprayed, thereby raising the ammonia content in the gas system and compensating for the low desulfurization efficiency caused by low volatile ammonia levels. 3. When the system suffers from severe fluid loss due to high temperatures, it is not advisable to simply add liquid to the emergency tank; instead, a large amount of clean water should be added. This prevents the desulfurization fluid that has been stored in the emergency tank for an extended period and has deteriorated from entering the system, as this could disrupt the dynamic balance of the desulfurization fluid and lead to abnormal conditions such as foam formation and an excessive increase in specific gravity. Summer is the most challenging period for controlling the desulfurization systems in coking plants; therefore, it is necessary to focus on process optimization and equipment performance, enforce strict management practices, and properly manage the balance of various materials in order to get through this hot season smoothly.