The air inlet temperature of the first-suction packed tower is too high
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During the maintenance of 3+1 sulfuric acid production, about 1/4 of the cold and heat exchanger pipes were blocked. After driving, the first suction inlet temperature was about 260 (previously about 210). The amount of water added at 2 suction increased three times than before. A few days ago, it reached 308 degrees when the gas concentration was stable and the conversion temperature was stable. Preliminary analysis shows that the cold and heat exchanger may have a pipe leak (but it is impossible to stop the car for inspection). Please help analyze what other reasons are causing the sudden increase in the first suction inlet temperature.
After the cold and heat exchanger is blocked, the heat exchange area is reduced, the heat of the hot gas cannot be effectively transferred to the cold gas, and the temperature entering the tower will increase.
Purge the tube side of the cold and heat exchanger and clean the acid sludge in the shell side. The heat exchange effect of this exchanger is very poor. If the effect is not good after treatment, it should be replaced, otherwise production will be in trouble.
This post was last edited by Changzhi on 2010-4-9 15:42 1. The cold exchange area is not enough, the three-layer outlet flue gas does not fully exchange heat in the cold exchange, and the temperature of the first absorption tower rises accordingly. 2. The SO3 part in the cold exchange pipe side leaks into the secondary absorption tower through cold exchange, causing the SO3 content in the secondary absorption tower to increase, so the amount of water added increases. The measured overall conversion rate should drop.
The inlet air temperature of the first absorption tower is so high. If the acid absorption temperature is still the original temperature, a large temperature difference will increase the amount of acid mist. If the temperature of the gas sucked into the cooling exchange is lower than the dew point temperature, condensation acid will still form. Be careful to release acid when doing a cold change. The increase in the size of the second suction after adding water may be due to poor absorption of the first suction, or the cold exchange is leaking.
Thank you for your analysis. The temperature has dropped to about 288. The company does not agree to stop for further inspection. The key is that once our workshop stops, the three workshops behind it will completely stop production. Unless it is really impossible to produce, we can last as long as we can.
Cold exchange is mainly caused by blockage between tubes and reduction of heat exchange surface, causing the temperature to rise.； In addition, the heat exchange tube is likely to be corroded and SO2 leaks into the secondary conversion. You can check it without stopping. You can tell by measuring the pressure (resistance) and gas concentration.
Mengmok has partners in the United States who can provide rapid plugging of conversion heat exchangers. The main reason is that cold blowing is not required. Operators wear high-temperature suits with life support systems to enter the heat exchangers to plug leaks.
How long does it usually take to block a block, and whether the cost is very high, it may be more than building a new device! 9# snap your fingers