Two questions about sulfuric acid
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1. The scale of sulfur acid production is 600,000 tons/year. According to the basic design, Meng Moke’s starting acid production is only 278 tons. I have thought about this data for a long time, but I still can’t find a more reasonable answer. Comrades, please help and discuss it. (But don’t say they lost a 0) 2. The temperature of the flue gas entering the first suction tower is 165 degrees, and the temperature of the flue gas entering the second suction tower is 135 degrees. It is too unsafe. It seems that no domestic manufacturer controls such a low temperature. Does anyone know whether there is such a control abroad. This post was last edited by PNG on 2007-12-20 19:31 ]
The design of Lucci Company is also the same. The temperature of the flue gas entering the absorption tower is 165 degrees. This is the temperature of the flue gas at the entrance of the absorption tower of the sulfuric acid I and II systems in my workshop. personal opinion: High entering temperature into the absorption tower is not conducive to heat recovery and increases the load on the circulating water system. This post was last edited by Changzhi on 2007-12-20 20:43 ]
Our company also uses the Monsanto process. The temperature of the flue gas entering the first suction tower is 165 to 170 degrees, and the temperature of the flue gas entering the second suction tower is 135 degrees. This is balanced by considering dew point corrosion and heat recovery.
I would like to ask you both how the operation of the second suction economizer is in practice, how long it has been running safely, and whether there are any serious corrosion or water leakage accidents.
After more than three years of operation, the second-suction economizer (the economizer uses vacuum heat pipe technology) is operating normally, with no water leakage accidents, and the acid outlet at the bottom of the economizer has been free of condensed acid for several years.
278 tons is definitely not enough. The amount of acid injected into the system is more than this number.； According to theoretical calculations, the dew point of the first suction gas is around 125 degrees, and the dew point of the second suction gas is around 107 degrees. The actual operating dew point must be higher than the calculated value. Abnormal factors also need to be considered. As for heat recovery, every time the temperature of the gas entering the absorption tower decreases by 1 degree, approximately 1.7Kg more steam/ton of sulfuric acid can be recovered. Lowering the temperature causes the economizer area to increase a lot. You can check the economics. In addition, the high-temperature absorption process also makes sense. It also needs to be considered comprehensively.
Mr. Wuwei, it turns out that if the heat pipe economizer you use is at 135 degrees (the water supply is 110 degrees), is there any problem with using an ordinary economizer?
Does the calculation result consider that the moisture in the furnace gas is 0.1g/m3? In fact, the moisture in the furnace gas entering the absorption tower for sulfur acid production is much higher than this number. Did Meng Mok consider that the solid sulfur contains organic matter and unevaporated water in the design conditions? There are not a few devices with problems with the economizer of sulfur acid production.
Yes, it is only the theoretical dew point temperature calculated based on the moisture content of the air. The organic matter and unevaporated water in the sulfur are not calculated. In addition, catalyst dust will also increase the dew point temperature of the gas phase. Sennuo has now developed a new heat pipe economizer using enamel in the low temperature section. It has been used in the sulfuric acid plants of Baling Petrochemical and Hubei Yihua.
Under the condition of flue gas 135 degrees (water supply 110 degrees), the heat pipe economizer is more resistant to dew point corrosion than ordinary economizers. Because the outer tube wall temperature of the heat pipe economizer is higher than that of ordinary economizers, it is less likely to form dew points.
Is it a radial heat pipe? How high can it be? It's best to have more data like on the 6th floor.
Can you be more detailed? I can learn more.
This is where Meng Mo Ke’s technology is advanced. 1 Meng Mo Ke’s tower is small, the tower and tank are integrated, and the operation flexibility is high. For 600,000 tons/year sulfur acid production, 278 tons of raw acid is enough to start the production. 2 The temperature of the flue gas entering the first suction tower is 165 degrees, and the temperature of the flue gas entering the second suction tower is 135 degrees, which is conducive to recovering more medium-temperature waste heat. Using a good quality heat pipe economizer will not cause dew point corrosion.
It makes sense, you have a great reputation, and you have extraordinary equipment. Haha, your company is the leader in China's sulfuric acid industry. There are many things about you that everyone wants to know. Without attracting special attention from MECS, can you introduce more about the actual production situation? Haha, 1. When they were designing the basics, was the economizer a heat pipe type? 2. How is the gas heat exchanger operating? Have you opened it and seen what's going on inside? 3. Regarding the equipment scale of 1 million tons/year, what is the investment for the complete set of HRS? How much does it cost to invest in a Siemens turbine generator? Is there any economic analysis on HRS? 4. How much maternal acid does your factory prepare when driving?
Thank you. Ke Sheng also mentioned it. Ha, I understand. It seems that our design of MECS does not use heat pipes.
Answer 1st floor This is where Mengmok’s technology is advanced 1 Mengmok’s tower is small, the tower and tank are integrated, and the operation flexibility is large. For 600,000 tons/year sulfur acid production, 278 tons of raw acid is enough to start up. 2 The temperature of the flue gas entering the first suction tower is 165 degrees, and the temperature of the flue gas entering the second suction tower is 135 degrees, which is conducive to recovering more medium-temperature waste heat. Using a good quality heat pipe economizer will not cause dew point corrosion. Can such a small amount of sulfuric acid ensure that the conversion temperature rises? Can you please explain in detail the advanced features? Everyone can learn from it. * Thank you in advance!
If dry air is used for conversion and temperature rise, how can this little acid ensure the acid concentration when driving?
The 278 tons of acid may only be the amount of acid injected in the dry suction section during driving, and does not include the heated mother acid (please study the original English text of MECS carefully). As you said, add a 0 at the end of this number to get the approximate amount of mother acid to heat up.