I need help determining the appropriate height for a carbon dioxide absorption tower

For absorption towers, a packing layer height of 3 m is sufficient to meet the 90% carbon dioxide absorption requirement. It should be noted, however, that the quality and type of filler also affect the absorption efficiency; therefore, it is necessary to select an appropriate filler. Additionally, in practical operation, issues such as the pressure drop of the tower and gas-liquid distribution also need to be considered. For a desorption tower, a packing layer height of 3 m may be too high, which could lead to uneven solution flow. It is recommended to select an appropriate packing layer height based on the specific conditions; experiments or simulation calculations can be carried out to determine the optimal height. Furthermore, the design of the desorption tower also needs to take into account factors such as temperature, pressure, and solution flow rate. .

Help, I’m not sure about the height of this packing layer How is the height of the packing layer involved in chemical absorption of solutions calculated?

The calculation of the packing layer height involves various factors such as gas-liquid mass transfer and reaction kinetics, so experimental tests or numerical simulations are required. Here are some common calculation methods: 1. Theoretical plate number method: Based on the equilibrium state of the chemical reaction process and the rate of mass transfer, this method is used to determine the height of the packing layer. This method requires knowledge of the equilibrium constant of the chemical reaction, and it can only be used under specific conditions. 2. Trial and error method: The trial and error method is used in the laboratory to determine the height of the packing layer. First, determine the tower with different heights of packing under fixed flow rate and concentration conditions, and then identify the optimal height through testing. 3. Numerical calculation method: Numerical simulation software is used to simulate the flow field, mass transfer, and reactions within the packed tower. Using this method, it is possible to analyze the effect of the packing layer height on the absorption efficiency and determine the optimal height. It should be noted that the height of the packing layer is not the only design parameter; factors such as the type, density, shape, surface area, and porosity of the packing also need to be considered. At the same time, chemical reaction conditions (such as temperature, pressure, solution concentration, etc.) also affect the height of the packing layer. Therefore, in practical design, it is necessary to take multiple parameters into consideration and conduct a comprehensive analysis and evaluation. .

Thank you, expert. I’m using metal step rings; in this case, is 3m sufficient for the absorption tower and the desorption tower?

What are the components of smoke other than CO2? Are they inert gases?

Theoretically, the best approach is to conduct experiments in the laboratory using small towers to determine whether the filler height is appropriate. Even for the same type of filler, the efficiency can vary among different manufacturers. Questions like those posed by the original poster are quite general; even companies such as Sulzer need to rely on experiments in order to arrive at reliable design results.

Regarding this requirement, the filler height is acceptable; there are also many other influencing factors such as the regeneration cycle volume, temperature, gas lifting, flue gas composition, as well as the distribution and efficiency of the tower

This post was last edited by ljh09101119 on 2023-4-8 at 15:05. Inert gases can be considered as N2, as they do not participate in any reactions. In fact, as long as the flow rate of the absorption liquid is high enough, CO2 can be absorbed, but the flow rate of the absorption liquid determines the diameter of the tower. The equivalent plate height for general metal saddle packings is calculated as 0.5 m; therefore, the number of plates in your absorption tower is likely to be around 6. Calculations show that when the feed rate of the absorbent solution is 4 times that of the gas feed, the CO2 removal efficiency can reach 90%. At this point, the hydrodynamics of a tower with a diameter of 400 mm meet the requirements (in reality, a tower with a diameter of 300 mm is sufficient); the analytical tower has a diameter of 0.3 m, which is too small – according to your calculations, a tower with a diameter of at least 0.7 meters is required for the analytical model.