Study on mixing characteristics of multichamber static mixer
Abstract This study presents a specialized mixer design for gas burners aimed at improving the efficiency of phase mixing while minimizing system resistance and energy consumption. The proposed design utilizes a multi‐cavity mixer employing both radial and axial mixing techniques, eliminating the ne...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Wiley
2024-02-01
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| Series: | Engineering Reports |
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| Online Access: | https://doi.org/10.1002/eng2.12712 |
| _version_ | 1797335297510342656 |
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| author | Hongwei Shi Ziqiang Liu |
| author_facet | Hongwei Shi Ziqiang Liu |
| author_sort | Hongwei Shi |
| collection | DOAJ |
| description | Abstract This study presents a specialized mixer design for gas burners aimed at improving the efficiency of phase mixing while minimizing system resistance and energy consumption. The proposed design utilizes a multi‐cavity mixer employing both radial and axial mixing techniques, eliminating the need for additional power supply. Full premixed combustion of small gas‐fired industrial boiler has the function of “inhibiting” NOx emission from the source, and good mixing of fuel and combustion supporting air in the early stage is the primary prerequisite for realizing full premixed combustion denitration. In this article, a radial multichamber static mixer is designed following the characteristics of full premixed mixing in gas‐fired industrial boilers. The results demonstrate that the maximum pressure drop of the static mixer is 806 Pa; for gas and air branch pipes, the resistance coefficient f decreases rapidly with the increase in Reynolds number; when Re ≥ 1.2 × 103, the resistance coefficient in the air branch pipe decreases slowly; when Re ≥ 4.5 × 103, the resistance coefficient of gas branch pipe decreases slowly. Additionally, the maximum calculation error of symmetrical gas branch pipe is 9.1%. The static mixer's inlet exhibits a converted velocity of 24 m/s, and the outlet demonstrates an airflow velocity of 23.2 m/s. As a result, a kinetic energy loss of 6.5% is observed. The static mixing chamber makes the airflow rotate and causes different gases to shear and mix. The mixing channel has the function of correcting the airflow deviation, especially for the sudden expansion section. Generally, the two gases can be mixed evenly at the outlet of the mixer. The standard k‐e model and realizable k‐e model are employed to simulate the sudden expansion channel, and indicate that the standard k‐e has a wider range of influence. Further investigation is recommended to better comprehend and optimize this particular area of influence. |
| first_indexed | 2024-03-08T08:34:55Z |
| format | Article |
| id | doaj.art-10a9d3be701c436b8933a20f60fda6bf |
| institution | Directory Open Access Journal |
| issn | 2577-8196 |
| language | English |
| last_indexed | 2024-03-08T08:34:55Z |
| publishDate | 2024-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Engineering Reports |
| spelling | doaj.art-10a9d3be701c436b8933a20f60fda6bf2024-02-02T01:25:53ZengWileyEngineering Reports2577-81962024-02-0162n/an/a10.1002/eng2.12712Study on mixing characteristics of multichamber static mixerHongwei Shi0Ziqiang Liu1School of Energy and Mechanical Engineering Jiangxi University of Science and Technology Nanchang 330044 Jiangxi ChinaSchool of Energy and Mechanical Engineering Jiangxi University of Science and Technology Nanchang 330044 Jiangxi ChinaAbstract This study presents a specialized mixer design for gas burners aimed at improving the efficiency of phase mixing while minimizing system resistance and energy consumption. The proposed design utilizes a multi‐cavity mixer employing both radial and axial mixing techniques, eliminating the need for additional power supply. Full premixed combustion of small gas‐fired industrial boiler has the function of “inhibiting” NOx emission from the source, and good mixing of fuel and combustion supporting air in the early stage is the primary prerequisite for realizing full premixed combustion denitration. In this article, a radial multichamber static mixer is designed following the characteristics of full premixed mixing in gas‐fired industrial boilers. The results demonstrate that the maximum pressure drop of the static mixer is 806 Pa; for gas and air branch pipes, the resistance coefficient f decreases rapidly with the increase in Reynolds number; when Re ≥ 1.2 × 103, the resistance coefficient in the air branch pipe decreases slowly; when Re ≥ 4.5 × 103, the resistance coefficient of gas branch pipe decreases slowly. Additionally, the maximum calculation error of symmetrical gas branch pipe is 9.1%. The static mixer's inlet exhibits a converted velocity of 24 m/s, and the outlet demonstrates an airflow velocity of 23.2 m/s. As a result, a kinetic energy loss of 6.5% is observed. The static mixing chamber makes the airflow rotate and causes different gases to shear and mix. The mixing channel has the function of correcting the airflow deviation, especially for the sudden expansion section. Generally, the two gases can be mixed evenly at the outlet of the mixer. The standard k‐e model and realizable k‐e model are employed to simulate the sudden expansion channel, and indicate that the standard k‐e has a wider range of influence. Further investigation is recommended to better comprehend and optimize this particular area of influence.https://doi.org/10.1002/eng2.12712dynamic simulationnatural gasstatic mixerturbulent flow |
| spellingShingle | Hongwei Shi Ziqiang Liu Study on mixing characteristics of multichamber static mixer Engineering Reports dynamic simulation natural gas static mixer turbulent flow |
| title | Study on mixing characteristics of multichamber static mixer |
| title_full | Study on mixing characteristics of multichamber static mixer |
| title_fullStr | Study on mixing characteristics of multichamber static mixer |
| title_full_unstemmed | Study on mixing characteristics of multichamber static mixer |
| title_short | Study on mixing characteristics of multichamber static mixer |
| title_sort | study on mixing characteristics of multichamber static mixer |
| topic | dynamic simulation natural gas static mixer turbulent flow |
| url | https://doi.org/10.1002/eng2.12712 |
| work_keys_str_mv | AT hongweishi studyonmixingcharacteristicsofmultichamberstaticmixer AT ziqiangliu studyonmixingcharacteristicsofmultichamberstaticmixer |