METHOD FOR DETERMINING THE MODE AND DESIGN CHARACTERISTICS OF BUBBLING PLATES IN ABSORBERS BASED ON THE SPECIFIED MASS TRANSFER EFFICIENCY
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
KGEU
2.
Kazan National Research Technological University
Type:
Article
Pages:
from 118
to 124
Status:
Published
Received:
28.08.2025
Accepted:
23.12.2025
Published:
05.04.2026
Language:
Russian
Keywords:
ABSORPTION, BUBBLING, FLOW STRUCTURE, MASS TRANSFER, SEPARATION EFFICIENCY
Funding:
Issledovanie vypolneno za schet granta Rossiyskogo nauchnogo fonda № 25-29-00129, https://rscf.ru/project/25-29-00129/»
Abstract:
The problem of engineering calculation of mass transfer on bubbling plates in absorbers is considered and solved in order to determine the operating and design characteristics that ensure a given degree of separation of gas mixtures. Models of ideal gas displacement and complete mixing of the liquid phase are used on sinkhole plates, as well as on small-diameter strainers. An algorithm and an example of calculation based on a given mass transfer efficiency are presented. As a result, the gas velocity, the diameter of the absorber, the flow rate of the liquid absorber and the height of the static column of liquid are determined, which ensure a given mass transfer efficiency, i.e. the degree of absorption of the component. To improve the accuracy of calculating the mass transfer efficiency on plates with overflow devices (strainers, valves, etc.), a cellular model of the hydrodynamic structure of the liquid phase flow was used. A comparison is given with the calculation based on the ideal mixing model. It has been found that, taking into account the flow structure, the calculation of mass transfer efficiency is 5-7% higher compared to the model of ideal mixing in the liquid phase, since with ideal mixing the driving force of mass transfer is less. It is shown that it is possible to take into account the unevenness of the gas velocity profile and the gradient of the liquid column along the length of the plate when calculating the separation efficiency of the mixture. The developed method for calculating the absorption efficiency can be used in the design or modernization of devices.
The problem of engineering calculation of mass transfer on bubbling plates in absorbers is considered and solved in order to determine the operating and design characteristics that ensure a given degree of separation of gas mixtures. Models of ideal gas displacement and complete mixing of the liquid phase are used on sinkhole plates, as well as on small-diameter strainers. An algorithm and an example of calculation based on a given mass transfer efficiency are presented. As a result, the gas velocity, the diameter of the absorber, the flow rate of the liquid absorber and the height of the static column of liquid are determined, which ensure a given mass transfer efficiency, i.e. the degree of absorption of the component. To improve the accuracy of calculating the mass transfer efficiency on plates with overflow devices (strainers, valves, etc.), a cellular model of the hydrodynamic structure of the liquid phase flow was used. A comparison is given with the calculation based on the ideal mixing model. It has been found that, taking into account the flow structure, the calculation of mass transfer efficiency is 5-7% higher compared to the model of ideal mixing in the liquid phase, since with ideal mixing the driving force of mass transfer is less. It is shown that it is possible to take into account the unevenness of the gas velocity profile and the gradient of the liquid column along the length of the plate when calculating the separation efficiency of the mixture. The developed method for calculating the absorption efficiency can be used in the design or modernization of devices.
Keywords:
ABSORPTION, BUBBLING, FLOW STRUCTURE, MASS TRANSFER, SEPARATION EFFICIENCY
ABSORPTION, BUBBLING, FLOW STRUCTURE, MASS TRANSFER, SEPARATION EFFICIENCY
