Modeling of ammonia and methylamine absorption with water on a new regular packing
Relevance of the work is caused by the lack of mathematical description of ammonia and methylamines absorption from multicomponent gas mixtures in a regular packing. The main aim in the study is to develop a mathematical model and the method of calculating ammonia and methylamines absorption from a...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | Russian |
| Published: |
Tomsk Polytechnic University
2019-05-01
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| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
| Subjects: | |
| Online Access: | http://izvestiya.tpu.ru/archive/article/view/1591 |
| Summary: | Relevance of the work is caused by the lack of mathematical description of ammonia and methylamines absorption from multicomponent gas mixtures in a regular packing. The main aim in the study is to develop a mathematical model and the method of calculating ammonia and methylamines absorption from a gas mixture in a new regular tape packing. The nozzle can increase the degree of purification of process gases and intensify the absorption. The methods used in the study. Differential equations of mathematical model, incorporating material balance equation and mass transfer equations, are solved numerically. The results. The authors have calculated the volumetric mass transfer coefficient in a regular belt layer and the nozzle layer of Raschig rings at ammonia absorption from a gas mixture. The distribution of concentrations of the components over the packed bed height was determined and the comparative analysis of the mass transfer efficiency of a mixture of ammonia and amines absorption on regular and circular nozzles was carried out. It is shown that the volumetric coefficient of ammonia mass transfer on Raschig rings is in 1,2 times lower than that in a regular nozzle tape with an equal equivalent diameter and the mass transfer coefficient for a nozzle of the chord is in 1,72 times lower than that on a regular nozzle tape. When replacing the Raschig rings by a regular nozzle tape with the same mode of operation of the column and equal packed bed height the methylamines and ammonia concentration in gas phase at the outlet of the absorber is reduced by 10 %. At reducing fluid flow rate excess from 3 to 2 in the curve of change in trimethylamine concentration in gas by the packed bed height the layer extremum occurs. This can be explained by the relative decrease in trimethylamine absorption rate due to reduction of water consumption and increase in its temperature. |
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| ISSN: | 2500-1019 2413-1830 |