Response to air distribution size
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The air distribution volume should be enough to oxidize 1/3 of the hydrogen sulfide into sulfur dioxide. If the air distribution is too large, it will cause too much sulfur dioxide. Will the temperature rise of the bed after entering the converter be larger or smaller? (smaller). What is the reaction of H2S and SO2 in the converter? (2H2S+SO2=S8+H2O) If the air distribution volume is large, the furnace temperature will be high and the bed temperature will decrease. Why does it decrease? :loveliness: If the air distribution is large, it should be that less elemental sulfur is produced. After entering the converter, the reaction increases and more elemental sulfur is produced. Why does the bed temperature drop instead? :L always can't figure it out. I hope someone can give me some advice. Thanks! ! ! ! ! ! ! ! ! :During the handshake operation, if you see that the bed temperature is high, increase the furnace temperature, and vice versa if it is low. But I don’t understand it when I look at the reaction. Sorry. :'(
If the air distribution is too large, it will cause too much sulfur dioxide, and the amount of reaction in the converter will be less, and the temperature rise will definitely decrease. :) What method do you rely on to increase the furnace temperature? Is there no online analyzer for hydrogen sulfide and sulfur dioxide?
No, we adjust the air volume according to the furnace temperature. If the air distribution volume is small, the furnace temperature will be low. The opposite is true for high. Sometimes the air distribution is too small, which will cause the temperature of the exhaust gas furnace to rise. Is it due to incomplete reaction in the sulfur production part? Will excessive air distribution reduce the conversion rate?
The air distribution volume for sulfur recovery is calculated based on the composition of the acid gas. The ratio of hydrogen sulfide to sulfur dioxide in the converter is controlled at 2:1 to achieve the highest conversion rate. The temperature of the furnace is related to the combustion amount and composition of the acid gas. The bed temperature of the converter is related to the composition of the process gas. At 2:1, the reaction volume in the converter can reach the maximum, and the natural bed temperature rise is also the maximum.
When the air distribution is too large, the hydrogen sulfide/sulfur dioxide ratio in the subsequent reaction is less than 2, that is, there is excess sulfur dioxide after the reaction, and the unreacted amount in the reactor is small, causing the bed temperature to drop. If the air distribution is less than 2, the hydrogen sulfide/sulfur dioxide in the subsequent reaction is greater than 2, that is, there will be excess hydrogen sulfide after the reaction, and there will be less unreacted amount in the reactor, causing the bed temperature to drop. If the air distribution is just right, the hydrogen sulfide/sulfur dioxide ratio in the subsequent reaction is close to 2, that is, the excess amount of hydrogen sulfide and sulfur dioxide is the least after the reaction is completed. At this time, the reaction in the reactor is most permissible, and the bed temperature is the highest at this time. If the online analyzer fails and it is difficult to control the air distribution, the bed temperature can be used to determine whether the air distribution is appropriate. This post was last written by lcp_Edited by 1217 on 2009-3-9 14:17 ]
answer: The optimal air distribution is to make H2S/SO2 ≈ 2 in the process gas at the secondary outlet outlet. At this time, according to the reaction equation, the two achieve equivalent reactions, the reaction is most complete, the conversion rate is the highest, and of course the reaction temperature is also the highest. When the air distribution is too large, firstly, SO2 is excessive and the reaction is incomplete (reversible reaction); secondly, due to excessive SO2, the catalyst is sulfated, which affects the activity and is also an important reason for the decrease in bed temperature. But it doesn’t mean that once there is an excess of SO2, the temperature rise in the bed will drop immediately, it will take some time! In terms of operation, the air distribution cannot be adjusted based on the bed temperature, because like excessive SO2, it will take a long time to be reflected in the rise and fall of the bed temperature, and the air distribution operation cannot be guided in a timely manner. If there is no ratio analyzer, you should refer to the temperature rise of the hydrogenation reactor bed and the temperature change of the tail gas furnace. The temperature rise of the Claus converter bed is too slow. If the exhaust gas is not started, refer to the smoke condition of the chimney and the temperature of the exhaust gas furnace. Don’t refer to the temperature rise of the converter bed, it’s too slow! This post was last edited by zxh6267 on 2009-3-9 15:06 ]
Do you mean that the size of the air distribution will cause the bed temperature to drop?