Design of large-scale sulfur plants
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This post was last edited by liaifeng on 2018-9-10 at 20:54. Nowadays, large-scale sulfur production units are equipped with air preheaters and acidic gas preheaters; as a result, the temperature of both the preheated acidic gas and air increases significantly. I wonder what impact preheating has on the sulfur production furnace? Please discuss actively to earn extra points
Preheating brings it closer to the reaction temperature, accelerating both the reaction rate and efficiency
Generally, the higher the temperature in the sulfur production furnace, the higher its conversion rate. Especially in the case of ammonia burning, a high furnace temperature facilitates complete decomposition. However, if the ammonia burning condition is taken into account during design, the cleaning of acidic gases generally involves a partial flow division system; during operation, the furnace temperature can be controlled by adjusting this flow split as needed. Some devices that lack a mid-stream split often require preheating of both air and acidic gases. However, acid gas preheaters are prone to problems such as leaks during operation.
Air preheating and acidic gas preheating are primarily intended to raise the temperature of the combustion furnace. As mentioned earlier, higher temperatures are required when burning ammonia; the air temperature is usually raised to 160°C. The main component of air is nitrogen, which does not participate in any reactions within the furnace but acts as a coolant. Raising the air temperature helps to increase the furnace temperature. Acidic gas preheating also typically reaches 160°C. When the feedstock contains ammonia, the temperature of the pipelines and equipment handling acidic gases must be at least 90°C to prevent blockages caused by ammonium salts. In reality, blockages do occur, but it depends on the severity of the issue.
It involves heating the air and acid gas before they enter the reactor with steam at 1.0 Mpa to around 150°C!