Reasons why the upper limit for acid temperature in the first absorption tower and that in the second absorption tower are different
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To improve the absorption rate, high-temperature absorption is employed in this two-turn two-absorption process. The acid temperature is generally controlled as follows: the acid temperature at the inlet of the first absorption tower is 55°C to 70°C, while it is 55°C to 75°C at the inlet of the second absorption tower. What is the reason for the difference in the upper limits for these acid temperatures? In my opinion, the main purpose is to control the temperature of the acid returning to the bottom of the tower. The temperature of the acid returning to the bottom of the first absorption tower is about 10–20°C higher than that at the bottom of the second absorption tower. Setting the upper limit for the inlet temperature of the first absorption tower 5°C lower than that of the second tower is done to reduce the temperature of the acid returning to the bottom of the first absorption tower.
High-temperature absorption refers to the absorption process in which the temperature of the flue gas at the inlet of the absorption tower is increased from the originally designed range of 140–160°C to 180–220°C or even 240°C; such a process is known as high-temperature absorption. The original poster’s explanation of acid temperature is also reasonable.
What I meant by writing this is to explain, via handshake:handshake, that the upper limits for the acid and temperature control parameters differ between the first absorption tower and the second absorption tower
Your reasoning is correct: victory:
I’m lucky to have received expert guidance from Dr. Pei; I’m very happy
Feel free to come and communicate often. The industry zone becomes amazing thanks to your participation!
It depends; sometimes it is necessary to raise the temperature of the smoke at the second inhalation point in order to control the acid mist at the outlet of that second inhalation. High temperatures facilitate diffusion, while low temperatures facilitate absorption, thus forming a pair of equilibria
Actually, this can be tried; as long as it works well, the industry scope is just for reference.
When the acid temperature entering the tower is high, the heat transfer temperature difference in the acid cooler becomes larger. When the scale on the surface of the packing in the two-stage absorber increases, it is necessary to raise the acid temperature in the tower in order to control the amount of acid mist generated.
The control of acid and temperature varies from one manufacturer to another. For controlling acid mist, it is best to keep the difference between the temperature of the acid entering the tower and the temperature of the smoke inside the tower within 100 degrees when using upper-tower acid