Numerical study on gas-solid flow characteristics of ultra-light particles in a cyclone separator
Cyclone separator is a widely used mechanical equipment that removes solid materials from transport gas, and the separation characteristics depends heavily on material properties. Most separation objects commonly studied are micron-sized powders or particles of high density with the magnitude rangin...
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| Veröffentlicht in: | Powder technology 2019-02, Vol.344, p.784-796 |
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| creator | Zhou, Haili Hu, Zhanqi Zhang, Qinglong Wang, Qiang Lv, Xuan |
| description | Cyclone separator is a widely used mechanical equipment that removes solid materials from transport gas, and the separation characteristics depends heavily on material properties. Most separation objects commonly studied are micron-sized powders or particles of high density with the magnitude ranging from 102 to 103kg/m3. While the particle density of expanded graphite (EG), a new type of material that is widely used in industry, is only a few tenths of conventional materials. However, the cyclone separation of such ultra-light particle has not been studied so far. This paper, based on the computational fluid dynamics and discrete element (CFD-DEM) coupling method, performs simulation experiments of the ultra-light particle cyclone separation at different inlet velocities. The pressure and velocity distribution of the continuous phase in the separator are studied. The effects of ultra-light particles on the flow field are revealed. The particle flow patterns are obtained and the force characteristics of the ultra-light particle are analyzed. Simulation results are verified experimentally. The results show that the separation characteristics of ultra-light particles are different from that of conventional materials: a) the appearance of ultra-light particles has negligible effect on the flow field in the separator; b) the ultra-light particles can be completely separated even if the inlet velocity is low; c) when the inlet velocity is higher than 7.5m/s, "top ash ring" composed of ultra-light particles appears under the roof of the cyclone, and multi-helical particle stream is observed in the cylinder region; besides,some "stagnant" particles rotate horizontally in the cone separation zone; d) particle turbulent diffusions in the upper part of the cyclone become stronger first and then weaker as the inlet velocity increases; e) the gas-particle coupling force and collision force are much larger than the particle gravity, and collisions of particles with different sizes are the main cause of secondary particle breakage.
•The following figure presents the gas-solid flow characteristic of ultra-light particles in cyclone separator.•The left graph shows the particle flow pattern. A "top ash ring" similar to the powder separation appears under the roof of the cyclone; a plurality of spiral particle stream form in the cylinder region and merge before entering the cone part; a "stagnation" particle string occurs at low locations in the cone zone and is nearly rota |
| doi_str_mv | 10.1016/j.powtec.2018.12.054 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_journals_2215515846</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S003259101831091X</els_id><sourcerecordid>2215515846</sourcerecordid><originalsourceid>FETCH-LOGICAL-c334t-60416726b46527c8a15d74c1fa3461eeb693db611cddfd36788da46bd814251c3</originalsourceid><addsrcrecordid>eNp9kE9LxDAQxYMouK5-Aw8Bz62ZJE27F0EW_8GiFwVvIU3S3ZRuU5NU2W9vl3r2NDDz3hveD6FrIDkQELdtPvifZHVOCVQ50JwU_AQtoCpZxmj1eYoWhDCaFSsg5-gixpYQIhiQBVKv494Gp1WHYxrNAfseb1XMou-cwU3nf7DeqaB0mlQxOR2xb_DYpaCyzm13CQ8qTOvORux6rLA-6M73Fkc7HVTy4RKdNaqL9upvLtHH48P7-jnbvD29rO83mWaMp0wQDqKkouaioKWuFBSm5BoaxbgAa2uxYqYWANqYxjBRVpVRXNSmAk4L0GyJbubcIfiv0cYkWz-GfnopKYWigKLiYlLxWaWDjzHYRg7B7VU4SCDyCFO2coYpjzAlUDnBnGx3s81ODb6dDTJqZ3ttjQtWJ2m8-z_gFyQkgFU</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2215515846</pqid></control><display><type>article</type><title>Numerical study on gas-solid flow characteristics of ultra-light particles in a cyclone separator</title><source>Elsevier ScienceDirect Journals</source><creator>Zhou, Haili ; Hu, Zhanqi ; Zhang, Qinglong ; Wang, Qiang ; Lv, Xuan</creator><creatorcontrib>Zhou, Haili ; Hu, Zhanqi ; Zhang, Qinglong ; Wang, Qiang ; Lv, Xuan</creatorcontrib><description>Cyclone separator is a widely used mechanical equipment that removes solid materials from transport gas, and the separation characteristics depends heavily on material properties. Most separation objects commonly studied are micron-sized powders or particles of high density with the magnitude ranging from 102 to 103kg/m3. While the particle density of expanded graphite (EG), a new type of material that is widely used in industry, is only a few tenths of conventional materials. However, the cyclone separation of such ultra-light particle has not been studied so far. This paper, based on the computational fluid dynamics and discrete element (CFD-DEM) coupling method, performs simulation experiments of the ultra-light particle cyclone separation at different inlet velocities. The pressure and velocity distribution of the continuous phase in the separator are studied. The effects of ultra-light particles on the flow field are revealed. The particle flow patterns are obtained and the force characteristics of the ultra-light particle are analyzed. Simulation results are verified experimentally. The results show that the separation characteristics of ultra-light particles are different from that of conventional materials: a) the appearance of ultra-light particles has negligible effect on the flow field in the separator; b) the ultra-light particles can be completely separated even if the inlet velocity is low; c) when the inlet velocity is higher than 7.5m/s, "top ash ring" composed of ultra-light particles appears under the roof of the cyclone, and multi-helical particle stream is observed in the cylinder region; besides,some "stagnant" particles rotate horizontally in the cone separation zone; d) particle turbulent diffusions in the upper part of the cyclone become stronger first and then weaker as the inlet velocity increases; e) the gas-particle coupling force and collision force are much larger than the particle gravity, and collisions of particles with different sizes are the main cause of secondary particle breakage.
•The following figure presents the gas-solid flow characteristic of ultra-light particles in cyclone separator.•The left graph shows the particle flow pattern. A "top ash ring" similar to the powder separation appears under the roof of the cyclone; a plurality of spiral particle stream form in the cylinder region and merge before entering the cone part; a "stagnation" particle string occurs at low locations in the cone zone and is nearly rotate horizontally.•The middle graph shows the experimental results. The pressure drop of particle-laden flow is slightly smaller than that of pure gas flow.•The right graph shows the simulated results. Axial velocity and tangential velocity of gas-solid two phase flow are almost the same as those without particles. [Display omitted]
•CFD-DEM method is used to study gas-solid flow of cyclones.•Separation characteristics of ultra-light particles are studied.•Ultra-light particle existence hardly affects the flow field.•Inter-particle collision force is main cause of particle breakage.•The research is applied for cyclone separation of ultra-light particles.</description><identifier>ISSN: 0032-5910</identifier><identifier>EISSN: 1873-328X</identifier><identifier>DOI: 10.1016/j.powtec.2018.12.054</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>Breakage ; Computational fluid dynamic ; Computational fluid dynamics ; Computer applications ; Computer simulation ; Coupling ; Cyclone separator ; Cyclone separators ; Cylinders ; Discrete element ; Discrete element method ; Flow characteristics ; Fluid dynamics ; Fluid flow ; Gas-solid two phase flow ; Hydrodynamics ; Light ; Material properties ; Mechanical equipment ; Particle density (concentration) ; Separation ; Separators ; Stress concentration ; Ultra-light particle ; Velocity ; Velocity distribution</subject><ispartof>Powder technology, 2019-02, Vol.344, p.784-796</ispartof><rights>2018 Elsevier B.V.</rights><rights>Copyright Elsevier BV Feb 15, 2019</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c334t-60416726b46527c8a15d74c1fa3461eeb693db611cddfd36788da46bd814251c3</citedby><cites>FETCH-LOGICAL-c334t-60416726b46527c8a15d74c1fa3461eeb693db611cddfd36788da46bd814251c3</cites><orcidid>0000-0002-3221-3604</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S003259101831091X$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids></links><search><creatorcontrib>Zhou, Haili</creatorcontrib><creatorcontrib>Hu, Zhanqi</creatorcontrib><creatorcontrib>Zhang, Qinglong</creatorcontrib><creatorcontrib>Wang, Qiang</creatorcontrib><creatorcontrib>Lv, Xuan</creatorcontrib><title>Numerical study on gas-solid flow characteristics of ultra-light particles in a cyclone separator</title><title>Powder technology</title><description>Cyclone separator is a widely used mechanical equipment that removes solid materials from transport gas, and the separation characteristics depends heavily on material properties. Most separation objects commonly studied are micron-sized powders or particles of high density with the magnitude ranging from 102 to 103kg/m3. While the particle density of expanded graphite (EG), a new type of material that is widely used in industry, is only a few tenths of conventional materials. However, the cyclone separation of such ultra-light particle has not been studied so far. This paper, based on the computational fluid dynamics and discrete element (CFD-DEM) coupling method, performs simulation experiments of the ultra-light particle cyclone separation at different inlet velocities. The pressure and velocity distribution of the continuous phase in the separator are studied. The effects of ultra-light particles on the flow field are revealed. The particle flow patterns are obtained and the force characteristics of the ultra-light particle are analyzed. Simulation results are verified experimentally. The results show that the separation characteristics of ultra-light particles are different from that of conventional materials: a) the appearance of ultra-light particles has negligible effect on the flow field in the separator; b) the ultra-light particles can be completely separated even if the inlet velocity is low; c) when the inlet velocity is higher than 7.5m/s, "top ash ring" composed of ultra-light particles appears under the roof of the cyclone, and multi-helical particle stream is observed in the cylinder region; besides,some "stagnant" particles rotate horizontally in the cone separation zone; d) particle turbulent diffusions in the upper part of the cyclone become stronger first and then weaker as the inlet velocity increases; e) the gas-particle coupling force and collision force are much larger than the particle gravity, and collisions of particles with different sizes are the main cause of secondary particle breakage.
•The following figure presents the gas-solid flow characteristic of ultra-light particles in cyclone separator.•The left graph shows the particle flow pattern. A "top ash ring" similar to the powder separation appears under the roof of the cyclone; a plurality of spiral particle stream form in the cylinder region and merge before entering the cone part; a "stagnation" particle string occurs at low locations in the cone zone and is nearly rotate horizontally.•The middle graph shows the experimental results. The pressure drop of particle-laden flow is slightly smaller than that of pure gas flow.•The right graph shows the simulated results. Axial velocity and tangential velocity of gas-solid two phase flow are almost the same as those without particles. [Display omitted]
•CFD-DEM method is used to study gas-solid flow of cyclones.•Separation characteristics of ultra-light particles are studied.•Ultra-light particle existence hardly affects the flow field.•Inter-particle collision force is main cause of particle breakage.•The research is applied for cyclone separation of ultra-light particles.</description><subject>Breakage</subject><subject>Computational fluid dynamic</subject><subject>Computational fluid dynamics</subject><subject>Computer applications</subject><subject>Computer simulation</subject><subject>Coupling</subject><subject>Cyclone separator</subject><subject>Cyclone separators</subject><subject>Cylinders</subject><subject>Discrete element</subject><subject>Discrete element method</subject><subject>Flow characteristics</subject><subject>Fluid dynamics</subject><subject>Fluid flow</subject><subject>Gas-solid two phase flow</subject><subject>Hydrodynamics</subject><subject>Light</subject><subject>Material properties</subject><subject>Mechanical equipment</subject><subject>Particle density (concentration)</subject><subject>Separation</subject><subject>Separators</subject><subject>Stress concentration</subject><subject>Ultra-light particle</subject><subject>Velocity</subject><subject>Velocity distribution</subject><issn>0032-5910</issn><issn>1873-328X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNp9kE9LxDAQxYMouK5-Aw8Bz62ZJE27F0EW_8GiFwVvIU3S3ZRuU5NU2W9vl3r2NDDz3hveD6FrIDkQELdtPvifZHVOCVQ50JwU_AQtoCpZxmj1eYoWhDCaFSsg5-gixpYQIhiQBVKv494Gp1WHYxrNAfseb1XMou-cwU3nf7DeqaB0mlQxOR2xb_DYpaCyzm13CQ8qTOvORux6rLA-6M73Fkc7HVTy4RKdNaqL9upvLtHH48P7-jnbvD29rO83mWaMp0wQDqKkouaioKWuFBSm5BoaxbgAa2uxYqYWANqYxjBRVpVRXNSmAk4L0GyJbubcIfiv0cYkWz-GfnopKYWigKLiYlLxWaWDjzHYRg7B7VU4SCDyCFO2coYpjzAlUDnBnGx3s81ODb6dDTJqZ3ttjQtWJ2m8-z_gFyQkgFU</recordid><startdate>20190215</startdate><enddate>20190215</enddate><creator>Zhou, Haili</creator><creator>Hu, Zhanqi</creator><creator>Zhang, Qinglong</creator><creator>Wang, Qiang</creator><creator>Lv, Xuan</creator><general>Elsevier B.V</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7ST</scope><scope>8BQ</scope><scope>8FD</scope><scope>C1K</scope><scope>JG9</scope><scope>SOI</scope><orcidid>https://orcid.org/0000-0002-3221-3604</orcidid></search><sort><creationdate>20190215</creationdate><title>Numerical study on gas-solid flow characteristics of ultra-light particles in a cyclone separator</title><author>Zhou, Haili ; Hu, Zhanqi ; Zhang, Qinglong ; Wang, Qiang ; Lv, Xuan</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c334t-60416726b46527c8a15d74c1fa3461eeb693db611cddfd36788da46bd814251c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Breakage</topic><topic>Computational fluid dynamic</topic><topic>Computational fluid dynamics</topic><topic>Computer applications</topic><topic>Computer simulation</topic><topic>Coupling</topic><topic>Cyclone separator</topic><topic>Cyclone separators</topic><topic>Cylinders</topic><topic>Discrete element</topic><topic>Discrete element method</topic><topic>Flow characteristics</topic><topic>Fluid dynamics</topic><topic>Fluid flow</topic><topic>Gas-solid two phase flow</topic><topic>Hydrodynamics</topic><topic>Light</topic><topic>Material properties</topic><topic>Mechanical equipment</topic><topic>Particle density (concentration)</topic><topic>Separation</topic><topic>Separators</topic><topic>Stress concentration</topic><topic>Ultra-light particle</topic><topic>Velocity</topic><topic>Velocity distribution</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhou, Haili</creatorcontrib><creatorcontrib>Hu, Zhanqi</creatorcontrib><creatorcontrib>Zhang, Qinglong</creatorcontrib><creatorcontrib>Wang, Qiang</creatorcontrib><creatorcontrib>Lv, Xuan</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Environment Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Materials Research Database</collection><collection>Environment Abstracts</collection><jtitle>Powder technology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhou, Haili</au><au>Hu, Zhanqi</au><au>Zhang, Qinglong</au><au>Wang, Qiang</au><au>Lv, Xuan</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Numerical study on gas-solid flow characteristics of ultra-light particles in a cyclone separator</atitle><jtitle>Powder technology</jtitle><date>2019-02-15</date><risdate>2019</risdate><volume>344</volume><spage>784</spage><epage>796</epage><pages>784-796</pages><issn>0032-5910</issn><eissn>1873-328X</eissn><abstract>Cyclone separator is a widely used mechanical equipment that removes solid materials from transport gas, and the separation characteristics depends heavily on material properties. Most separation objects commonly studied are micron-sized powders or particles of high density with the magnitude ranging from 102 to 103kg/m3. While the particle density of expanded graphite (EG), a new type of material that is widely used in industry, is only a few tenths of conventional materials. However, the cyclone separation of such ultra-light particle has not been studied so far. This paper, based on the computational fluid dynamics and discrete element (CFD-DEM) coupling method, performs simulation experiments of the ultra-light particle cyclone separation at different inlet velocities. The pressure and velocity distribution of the continuous phase in the separator are studied. The effects of ultra-light particles on the flow field are revealed. The particle flow patterns are obtained and the force characteristics of the ultra-light particle are analyzed. Simulation results are verified experimentally. The results show that the separation characteristics of ultra-light particles are different from that of conventional materials: a) the appearance of ultra-light particles has negligible effect on the flow field in the separator; b) the ultra-light particles can be completely separated even if the inlet velocity is low; c) when the inlet velocity is higher than 7.5m/s, "top ash ring" composed of ultra-light particles appears under the roof of the cyclone, and multi-helical particle stream is observed in the cylinder region; besides,some "stagnant" particles rotate horizontally in the cone separation zone; d) particle turbulent diffusions in the upper part of the cyclone become stronger first and then weaker as the inlet velocity increases; e) the gas-particle coupling force and collision force are much larger than the particle gravity, and collisions of particles with different sizes are the main cause of secondary particle breakage.
•The following figure presents the gas-solid flow characteristic of ultra-light particles in cyclone separator.•The left graph shows the particle flow pattern. A "top ash ring" similar to the powder separation appears under the roof of the cyclone; a plurality of spiral particle stream form in the cylinder region and merge before entering the cone part; a "stagnation" particle string occurs at low locations in the cone zone and is nearly rotate horizontally.•The middle graph shows the experimental results. The pressure drop of particle-laden flow is slightly smaller than that of pure gas flow.•The right graph shows the simulated results. Axial velocity and tangential velocity of gas-solid two phase flow are almost the same as those without particles. [Display omitted]
•CFD-DEM method is used to study gas-solid flow of cyclones.•Separation characteristics of ultra-light particles are studied.•Ultra-light particle existence hardly affects the flow field.•Inter-particle collision force is main cause of particle breakage.•The research is applied for cyclone separation of ultra-light particles.</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.powtec.2018.12.054</doi><tpages>13</tpages><orcidid>https://orcid.org/0000-0002-3221-3604</orcidid></addata></record> |
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| subjects | Breakage Computational fluid dynamic Computational fluid dynamics Computer applications Computer simulation Coupling Cyclone separator Cyclone separators Cylinders Discrete element Discrete element method Flow characteristics Fluid dynamics Fluid flow Gas-solid two phase flow Hydrodynamics Light Material properties Mechanical equipment Particle density (concentration) Separation Separators Stress concentration Ultra-light particle Velocity Velocity distribution |
| title | Numerical study on gas-solid flow characteristics of ultra-light particles in a cyclone separator |
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