Structural features of dry suction equipment with three towers and one tank
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In the design of dry suction three towers and one tank, three pumps plus a middle partition wall are considered. What is the reason for this? And how is the height of the partition wall determined? If there is no need for a partition wall and the acid is mixed directly, what are the disadvantages? Please give me some advice from an expert.
The height of the partition wall is equal to the top of the overflow opening, and a connecting port is provided at the bottom. The area must ensure the flow rate.
In addition to the reasons mentioned on the second floor above, partition walls also have the function of reducing the generation of acid mist and acid vapor.
Our company's three towers and one tank are designed by Meng Moko. There is no partition wall in the acid circulation tank. During operation, it was found that the water dilution pipe (made of PTFE) was bent and broken. This was caused by the turbulent erosion of the acid in the tank. It was later changed to zecor material and is running well now. The generated acid mist is led away by the negative pressure pipeline connected to the inlet of the drying tower.
The structure of the water dilution pipe can be changed. Bizhi once designed a water adder, which has better results. On the other hand, the ability of ZeCor material to adapt to water-adding conditions shows that it has excellent corrosion resistance. Our workshop has tested 316L, domestic SS920, and SX alloys on water dispensers, and found corrosion fractures in less than a month of use. This post was last edited by Changzhi on 2008-2-24 14:56 ]
The main purpose of adding a partition wall in the middle of a tank is 1. There is a concentration difference between the acid return in the three towers, so water can be added in one section; 2. The temperatures of the acid return are different, and only one acid cooler can be installed through the large circulation of the three pumps.； 3. The most important thing is that the returned acid in each tower contains different concentrations of sulfur dioxide, which reduces emissions and losses.
1. Small and medium-sized sulfur acid production equipment should adopt "three towers and one tank" (the mixed acid tank is equipped with open partitions), which simplifies the pipeline, reduces investment, and makes start-up and normal operation easier. 2. Large-scale sulfur acid-making equipment should consider the recovery and utilization of low-temperature waste heat. It should adopt a dry suction process in which drying and two suction mixed acid tanks are combined, and a separate mixed acid tank is installed on the first suction, leaving room for the launch of HRS or DWHS.
What you said on the 2nd floor makes sense. There should be no acid pump installed on the part separated by the partition wall. But I have also seen a pump installed on the upper partition wall of this tank. If there is no partition wall, when the amount of circulating acid is large, shouldn't acids with different acid concentrations be mixed more evenly, so that dilute acid is less likely to corrode the pump?
What is the domestic SS920?