The convective section of the converter contains sulfides
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This post was last edited by dongliangsir on 2010-10-19 at 23:35. Sulfides are precipitating in the convection section of our hydrogen production plant’s converter – what are some good ways to deal with this?
The convection section of the hydrogen production converter mentioned by the poster is the preheating stage before the feed gas leaves the desulfurization unit and enters the converter. If sulfides are detected in the feed gas at this stage, it is likely that the sulfur capacity of the ZnO desulfurization agent has been exceeded, which could pose a threat to the conversion catalyst; therefore, the desulfurization agent should be replaced. One more question regarding the original poster’s query: What is the form in which sulfides precipitate? Why is the term “precipitation” used? And where do they precipitate?
1. Replace the desulfurization catalyst as soon as possible, otherwise it will cause deactivation of the conversion catalyst. 2. Process sulfur-free dry gas to maintain production. 3. Increase the water-to-carbon ratio. 4. What are the symptoms associated with sulfide precipitation? Could you please explain that?
Is the poster referring to the precipitation of sulfides in the flue gas of the convection section of the converter? Our equipment experiences a similar situation; it mainly prevents the flue gas from reaching its dew point temperature by changing the fuel gas and raising the flue gas temperature.
Is it inside the gaps of the plate-type air preheater? This is a design issue of the air preheater.
This post was last edited by Qianli Cao Yuan on 2010-11-6 at 11:09. 1. Open the bypass valve on the air side of the air preheater to reduce the amount of air entering the preheater and increase the flue gas temperature. 2. Increase the temperature of the air entering the preheater; there are two methods: use a pre-air preheater ； Or draw air from the top of the converter. I have used the latter design; in a southern refinery where the ambient temperature is around 30°C, the air temperature of the air drawn from the furnace roof into the air preheater is around 60°C. The effect is very good; it achieves two goals at once: it increases the temperature of the air entering the preheater and reduces the ambient temperature at the top of the furnace, thereby accelerating air circulation there and improving the operating conditions.
I misunderstood floors 1 and 2; there are sulfur crystals in the convection section of the flue, which indicates a high hydrogen sulfide content in the fuel gas. Additionally, the air preheater is too efficient, resulting in an excessively low exhaust gas temperature!