Definition of heat exchange process
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In practical applications, heat exchange processes are often encountered, such as the “3+1” ⅣⅠ－ⅢⅡ process: Is this the correct way to interpret it? 1. Convert once into three sections: layer one, layer two, layer three; convert again to four layers ； 2. The heat exchangers are named using SO3; the exhaust gas at the outlet of the first cooling stage is denoted as Exchanger I, and so on ； 3. The gas first passes through the heating section on the SO2 side of converter IV, then through the heating section on the SO2 side of converter I before reaching the next stage. The SO2-containing flue gas coming from the first absorption tower first goes through the heating sections on the SO2 sides of converters II and III before reaching the fourth stage; the flue gas exiting these three stages is cooled by converter III before returning to the first absorption tower, while the flue gas exiting the fourth stage is cooled by converter IV before being sent to the second absorption tower.
That’s exactly how it is. 3+1: the number before the + sign represents the number of segments for the first transformation, while the number after it represents the number of segments for the second transformation. ⅣⅠ－ⅢⅡ: The process before the — symbol represents the heat exchange process for primary conversion, while the process after the — symbol represents the heat exchange process for secondary conversion
ⅣⅠ－ⅢⅡ: The SO2-containing flue gas from one absorption tower first enters the SO2 side of Ⅲ exchanger and then Ⅱ exchanger for heating before proceeding to the four layers.
The moderator has really sharp eyes; I’ve learned from it. Hehe, Mr. Flashy wanted to show off, but unfortunately he revealed a tiny flaw. :lol
Is that so? No teacher has taught me this before; I figured it out on my own. The main issue is that I’m not quite sure about the order in which SO2 moves through the right half of the heat exchange process, which is why I posted this to discuss it with everyone.
Smart! The master taught me several times, but I still didn’t understand. :L
Hehe, it’s already over; don’t put too much strain on one’s patience
I’ve been putting up with this issue for a long time; for those who work with sulfuric acid, it’s basically a matter of 1+1=2. Why is that? The two-conversion-two-suction process has been popular for at least 20 years now. Initially it was 3+1, which meant one conversion to three stages (there were three layers of catalysts), and then it went to a absorption tower. Two turns into one conversion (that is, there is a layer of catalyst). ⅢⅠ－ⅣⅡ and ⅣⅠ－ⅢⅡ are used to describe what heats the cold gas that has undergone one or two rotations; ⅢⅠ－ⅣⅡ is the most common one. 3,1 means three sections of hot gas at the outlet (around 430 degrees) and one section of hot gas at the outlet (580 degrees) to heat the gas coming from the drying tower (60 degrees). 4,2 refers to the use of four-stage outlet hot gas (424 degrees) and two-stage outlet hot gas (520 degrees) to heat the cold gas coming out of the absorption tower and going to the second stage (60 degrees). The 3+2 five-stage conversion for other processes can be inferred in a similar manner. This post was last edited by Peach blossoms are in bloom on 2009-4-1 22:10.]
It seems it was really just passed down orally, with no teachers providing formal instruction, right? :O But now it seems a bit clearer. Listening to you speak is worth ten years of study. :P
When I first came into contact with sulfuric acid, I was confused by all the various heat exchange processes. It was only after examining the flow diagrams carefully that I figured out how they were named; I figured it out on my own, without any verification from any available materials. Few people ask about this, and I guess teachers don’t bother to explain it either. There’s also a cold-heat exchanger, a heat-heat exchanger, a cold-reheat exchanger, and so on – it’s the same principle here, right?
Terms like “cold heat exchanger, hot heat exchanger, cold re-heat exchanger” are probably direct translations of the English phrases cold heat exchanger, hot heat exchanger, cold re-heat exchanger I don’t really like this translation; ‘cold’ and ‘hot’ should be translated as low temperature and high temperature, in order to distinguish them from ‘heat’, which represents heat energy. The re-heat exchanger refers to the gas that has been cooled after one rotation and then sent to a suction tower, where it is heated again before going to the second rotation. :(