CATALYTIC COMBUSTION OF METHANE OVER Pt/γ-Al2O3 IN MICRO-COMBUSTOR WITH DETAILED CHEMICAL KINETIC MECHANISMS
Micro-scale catalytic combustion characteristics and heat transfer processes of preheated methane-air mixtures (φ = 0.4) in the plane channel were investigated numerically with detailed chemical kinetic mechanisms. The plane channel of length L = 10.0 mm, height H =1.0 mm and wall thickness δ = 0.1...
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| Format: | Article |
| Language: | English |
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Alma Mater Publishing House "Vasile Alecsandri" University of Bacau
2014-11-01
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| Series: | Scientific Study & Research: Chemistry & Chemical Engineering, Biotechnology, Food Industry |
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| Online Access: | http://pubs.ub.ro/?pg=revues&rev=cscc6&num=201403&vol=3&aid=4150 |
| _version_ | 1819132582020775936 |
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| author | JUNJIE CHEN XUHUI GAO |
| author_facet | JUNJIE CHEN XUHUI GAO |
| author_sort | JUNJIE CHEN |
| collection | DOAJ |
| description | Micro-scale catalytic combustion characteristics and heat transfer processes of preheated methane-air mixtures (φ = 0.4) in the plane channel were investigated numerically with detailed chemical kinetic mechanisms. The plane channel of length L = 10.0 mm, height H =1.0 mm and wall thickness δ = 0.1 mm, which inner horizontal surfaces contained Pt/γ-Al2O3 catalyst washcoat. The computational results indicate that the presence of the gas phase reactions extends mildly the micro-combustion stability limits at low and moderate inlet velocities due to the strong flames establishment, and have a more profound effect on extending the high-velocity blowout limits by allowing for additional heat release originating mainly from the incomplete CH4 gas phase oxidation in the plane channel. When the same mass flow rate (ρin × Vin) is considered, the micro-combustion stability limits at p: 0.1 MPa are much narrower than at p: 0.6 MPa due to both gas phase and catalytic reaction activities decline with decreasing pressure. Catalytic micro-combustor can achieve stable combustion at low solid thermal conductivity ks < 0.1 W∙m-1•K-1, while the micro-combustion extinction limits reach their larger extent for the higher thermal conductivity ks = 20.0-100.0 W∙m-1•K-1. The existence of surface radiation heat transfers significantly effects on the micro-combustion stability limits and micro-combustors energy balance. Finally, gas phase combustion in catalytic micro-combustors can be sustained at the sub-millimeter scale (plane channel height of 0.25 mm). |
| first_indexed | 2024-12-22T09:33:41Z |
| format | Article |
| id | doaj.art-1bb4045388c44bbfa846752c7c7fa15a |
| institution | Directory Open Access Journal |
| issn | 1582-540X 1582-540X |
| language | English |
| last_indexed | 2024-12-22T09:33:41Z |
| publishDate | 2014-11-01 |
| publisher | Alma Mater Publishing House "Vasile Alecsandri" University of Bacau |
| record_format | Article |
| series | Scientific Study & Research: Chemistry & Chemical Engineering, Biotechnology, Food Industry |
| spelling | doaj.art-1bb4045388c44bbfa846752c7c7fa15a2022-12-21T18:30:52ZengAlma Mater Publishing House "Vasile Alecsandri" University of BacauScientific Study & Research: Chemistry & Chemical Engineering, Biotechnology, Food Industry1582-540X1582-540X2014-11-01153197212CATALYTIC COMBUSTION OF METHANE OVER Pt/γ-Al2O3 IN MICRO-COMBUSTOR WITH DETAILED CHEMICAL KINETIC MECHANISMSJUNJIE CHEN0XUHUI GAO1Henan Polytechnic University, School of Mechanical and Power Engineering, 454000, Jiaozuo, China Henan Polytechnic University, School of Mechanical and Power Engineering, 454000, Jiaozuo, China Micro-scale catalytic combustion characteristics and heat transfer processes of preheated methane-air mixtures (φ = 0.4) in the plane channel were investigated numerically with detailed chemical kinetic mechanisms. The plane channel of length L = 10.0 mm, height H =1.0 mm and wall thickness δ = 0.1 mm, which inner horizontal surfaces contained Pt/γ-Al2O3 catalyst washcoat. The computational results indicate that the presence of the gas phase reactions extends mildly the micro-combustion stability limits at low and moderate inlet velocities due to the strong flames establishment, and have a more profound effect on extending the high-velocity blowout limits by allowing for additional heat release originating mainly from the incomplete CH4 gas phase oxidation in the plane channel. When the same mass flow rate (ρin × Vin) is considered, the micro-combustion stability limits at p: 0.1 MPa are much narrower than at p: 0.6 MPa due to both gas phase and catalytic reaction activities decline with decreasing pressure. Catalytic micro-combustor can achieve stable combustion at low solid thermal conductivity ks < 0.1 W∙m-1•K-1, while the micro-combustion extinction limits reach their larger extent for the higher thermal conductivity ks = 20.0-100.0 W∙m-1•K-1. The existence of surface radiation heat transfers significantly effects on the micro-combustion stability limits and micro-combustors energy balance. Finally, gas phase combustion in catalytic micro-combustors can be sustained at the sub-millimeter scale (plane channel height of 0.25 mm).http://pubs.ub.ro/?pg=revues&rev=cscc6&num=201403&vol=3&aid=4150catalytic combustionchemical kinetic mechanismsmicro-combustionstability limitscombustion characteristicsheat transfer |
| spellingShingle | JUNJIE CHEN XUHUI GAO CATALYTIC COMBUSTION OF METHANE OVER Pt/γ-Al2O3 IN MICRO-COMBUSTOR WITH DETAILED CHEMICAL KINETIC MECHANISMS Scientific Study & Research: Chemistry & Chemical Engineering, Biotechnology, Food Industry catalytic combustion chemical kinetic mechanisms micro-combustion stability limits combustion characteristics heat transfer |
| title | CATALYTIC COMBUSTION OF METHANE OVER Pt/γ-Al2O3 IN MICRO-COMBUSTOR WITH DETAILED CHEMICAL KINETIC MECHANISMS |
| title_full | CATALYTIC COMBUSTION OF METHANE OVER Pt/γ-Al2O3 IN MICRO-COMBUSTOR WITH DETAILED CHEMICAL KINETIC MECHANISMS |
| title_fullStr | CATALYTIC COMBUSTION OF METHANE OVER Pt/γ-Al2O3 IN MICRO-COMBUSTOR WITH DETAILED CHEMICAL KINETIC MECHANISMS |
| title_full_unstemmed | CATALYTIC COMBUSTION OF METHANE OVER Pt/γ-Al2O3 IN MICRO-COMBUSTOR WITH DETAILED CHEMICAL KINETIC MECHANISMS |
| title_short | CATALYTIC COMBUSTION OF METHANE OVER Pt/γ-Al2O3 IN MICRO-COMBUSTOR WITH DETAILED CHEMICAL KINETIC MECHANISMS |
| title_sort | catalytic combustion of methane over pt γ al2o3 in micro combustor with detailed chemical kinetic mechanisms |
| topic | catalytic combustion chemical kinetic mechanisms micro-combustion stability limits combustion characteristics heat transfer |
| url | http://pubs.ub.ro/?pg=revues&rev=cscc6&num=201403&vol=3&aid=4150 |
| work_keys_str_mv | AT junjiechen catalyticcombustionofmethaneoverptgal2o3inmicrocombustorwithdetailedchemicalkineticmechanisms AT xuhuigao catalyticcombustionofmethaneoverptgal2o3inmicrocombustorwithdetailedchemicalkineticmechanisms |