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Gas–solid flow in an integrated external heat exchanger for CFB boiler
Various external heat exchangers (EHE) are widely used in large-scale circulating fluidized bed (CFB) boilers. A new type of pneumatically controlled EHE was developed in this paper. The major feature of this EHE system was that the flow of solids to two heat transfer chambers could be controlled. T...
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Published in: | Powder technology 2010-08, Vol.202 (1), p.55-61 |
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description | Various external heat exchangers (EHE) are widely used in large-scale circulating fluidized bed (CFB) boilers. A new type of pneumatically controlled EHE was developed in this paper. The major feature of this EHE system was that the flow of solids to two heat transfer chambers could be controlled. Thereby the quantity of heat transfer of different and multilevel heat transfer surfaces in the EHE could be easily adjusted. Also the EHE and recycle device were connected in order to recycle the solids back to the furnace steadily. Experiments completed in the visible EHE test rig show that the solid mass flow rates to the EHE or the loop seal, to two heat transfer chambers and to two exports of solids can be controlled by the aeration airflow into each chamber and geometrical dimensions like the height of partitions. That is because the change to fluidizing velocity of each chamber leads to the changes in particle entrainment rate and pressure distribution in the EHE. In addition, an empirical correlation between the solid mass flow rate and pressure drop across an orifice has been proposed and a new orifice discharging coefficient has been defined according to the experimental data and theoretical analysis.
A new type of pneumatically controlled EHE was developed in this paper. The flow of solids in EHE with loop seal could be controlled by the aeration airflow into each chamber and geometrical dimensions like the height of partitions. The control mechanisms of solid flow rate were studied.
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doi_str_mv | 10.1016/j.powtec.2010.04.006 |
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A new type of pneumatically controlled EHE was developed in this paper. The flow of solids in EHE with loop seal could be controlled by the aeration airflow into each chamber and geometrical dimensions like the height of partitions. The control mechanisms of solid flow rate were studied.
[Display omitted]</description><identifier>ISSN: 0032-5910</identifier><identifier>EISSN: 1873-328X</identifier><identifier>DOI: 10.1016/j.powtec.2010.04.006</identifier><identifier>CODEN: POTEBX</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Aeration ; Airflow ; Applied sciences ; Boilers ; Chambers ; Chemical engineering ; Circulating fluidized bed boiler ; Control of the solid flow rate ; Energy ; Energy. Thermal use of fuels ; Entrainment rate ; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc ; Exact sciences and technology ; External heat exchanger ; Heat exchangers ; Heat exchangers and evaporators ; Heat transfer ; Hydrodynamics of contact apparatus ; Mass flow rate ; Miscellaneous ; Orifice discharging coefficient ; Partitions ; Seals ; Solid-solid systems</subject><ispartof>Powder technology, 2010-08, Vol.202 (1), p.55-61</ispartof><rights>2010 Elsevier B.V.</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c368t-16b040f2782fdd065d1d9b2a86cec25e8d4b7cd27c4e5694e12c936b7d37de233</citedby><cites>FETCH-LOGICAL-c368t-16b040f2782fdd065d1d9b2a86cec25e8d4b7cd27c4e5694e12c936b7d37de233</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=22956167$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Xiong, Bin</creatorcontrib><creatorcontrib>Lu, Xiaofeng</creatorcontrib><creatorcontrib>Amano, R.S.</creatorcontrib><creatorcontrib>Liu, Hanzhou</creatorcontrib><title>Gas–solid flow in an integrated external heat exchanger for CFB boiler</title><title>Powder technology</title><description>Various external heat exchangers (EHE) are widely used in large-scale circulating fluidized bed (CFB) boilers. A new type of pneumatically controlled EHE was developed in this paper. The major feature of this EHE system was that the flow of solids to two heat transfer chambers could be controlled. Thereby the quantity of heat transfer of different and multilevel heat transfer surfaces in the EHE could be easily adjusted. Also the EHE and recycle device were connected in order to recycle the solids back to the furnace steadily. Experiments completed in the visible EHE test rig show that the solid mass flow rates to the EHE or the loop seal, to two heat transfer chambers and to two exports of solids can be controlled by the aeration airflow into each chamber and geometrical dimensions like the height of partitions. That is because the change to fluidizing velocity of each chamber leads to the changes in particle entrainment rate and pressure distribution in the EHE. In addition, an empirical correlation between the solid mass flow rate and pressure drop across an orifice has been proposed and a new orifice discharging coefficient has been defined according to the experimental data and theoretical analysis.
A new type of pneumatically controlled EHE was developed in this paper. The flow of solids in EHE with loop seal could be controlled by the aeration airflow into each chamber and geometrical dimensions like the height of partitions. The control mechanisms of solid flow rate were studied.
[Display omitted]</description><subject>Aeration</subject><subject>Airflow</subject><subject>Applied sciences</subject><subject>Boilers</subject><subject>Chambers</subject><subject>Chemical engineering</subject><subject>Circulating fluidized bed boiler</subject><subject>Control of the solid flow rate</subject><subject>Energy</subject><subject>Energy. Thermal use of fuels</subject><subject>Entrainment rate</subject><subject>Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc</subject><subject>Exact sciences and technology</subject><subject>External heat exchanger</subject><subject>Heat exchangers</subject><subject>Heat exchangers and evaporators</subject><subject>Heat transfer</subject><subject>Hydrodynamics of contact apparatus</subject><subject>Mass flow rate</subject><subject>Miscellaneous</subject><subject>Orifice discharging coefficient</subject><subject>Partitions</subject><subject>Seals</subject><subject>Solid-solid systems</subject><issn>0032-5910</issn><issn>1873-328X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><recordid>eNp9kMFOwzAMQCMEEmPwBxx6QZw6nKRN0gsSTMCQkLiAxC1KExcylWYkHYMb_8Af8iV02sSRiy1bz7b8CDmmMKFAxdl8sgirHu2EwdCCYgIgdsiIKslzztTTLhkBcJaXFYV9cpDSHAaCUxiR2Y1JP1_fKbTeZU0bVpnvMtMNscfnaHp0GX70GDvTZi9o-qGyL6Z7xpg1IWbT68usDr7FeEj2GtMmPNrmMXm8vnqYzvK7-5vb6cVdbrlQfU5FDQU0TCrWOAeidNRVNTNKWLSsROWKWlrHpC2wFFWBlNmKi1o6Lh0yzsfkdLN3EcPbElOvX32y2Lamw7BMWioJpVJQDmSxIW0MKUVs9CL6VxM_NQW99qbneuNNr71pKPTaypicbA-YZE3bRNNZn_5mGatKQYUcuPMNh8O37x6jTtZjZ9H5iLbXLvj_D_0Cg6iF6Q</recordid><startdate>20100801</startdate><enddate>20100801</enddate><creator>Xiong, Bin</creator><creator>Lu, Xiaofeng</creator><creator>Amano, R.S.</creator><creator>Liu, Hanzhou</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7TB</scope><scope>8BQ</scope><scope>8FD</scope><scope>FR3</scope><scope>JG9</scope></search><sort><creationdate>20100801</creationdate><title>Gas–solid flow in an integrated external heat exchanger for CFB boiler</title><author>Xiong, Bin ; Lu, Xiaofeng ; Amano, R.S. ; Liu, Hanzhou</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c368t-16b040f2782fdd065d1d9b2a86cec25e8d4b7cd27c4e5694e12c936b7d37de233</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Aeration</topic><topic>Airflow</topic><topic>Applied sciences</topic><topic>Boilers</topic><topic>Chambers</topic><topic>Chemical engineering</topic><topic>Circulating fluidized bed boiler</topic><topic>Control of the solid flow rate</topic><topic>Energy</topic><topic>Energy. Thermal use of fuels</topic><topic>Entrainment rate</topic><topic>Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc</topic><topic>Exact sciences and technology</topic><topic>External heat exchanger</topic><topic>Heat exchangers</topic><topic>Heat exchangers and evaporators</topic><topic>Heat transfer</topic><topic>Hydrodynamics of contact apparatus</topic><topic>Mass flow rate</topic><topic>Miscellaneous</topic><topic>Orifice discharging coefficient</topic><topic>Partitions</topic><topic>Seals</topic><topic>Solid-solid systems</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Xiong, Bin</creatorcontrib><creatorcontrib>Lu, Xiaofeng</creatorcontrib><creatorcontrib>Amano, R.S.</creatorcontrib><creatorcontrib>Liu, Hanzhou</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><jtitle>Powder technology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Xiong, Bin</au><au>Lu, Xiaofeng</au><au>Amano, R.S.</au><au>Liu, Hanzhou</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Gas–solid flow in an integrated external heat exchanger for CFB boiler</atitle><jtitle>Powder technology</jtitle><date>2010-08-01</date><risdate>2010</risdate><volume>202</volume><issue>1</issue><spage>55</spage><epage>61</epage><pages>55-61</pages><issn>0032-5910</issn><eissn>1873-328X</eissn><coden>POTEBX</coden><abstract>Various external heat exchangers (EHE) are widely used in large-scale circulating fluidized bed (CFB) boilers. A new type of pneumatically controlled EHE was developed in this paper. The major feature of this EHE system was that the flow of solids to two heat transfer chambers could be controlled. Thereby the quantity of heat transfer of different and multilevel heat transfer surfaces in the EHE could be easily adjusted. Also the EHE and recycle device were connected in order to recycle the solids back to the furnace steadily. Experiments completed in the visible EHE test rig show that the solid mass flow rates to the EHE or the loop seal, to two heat transfer chambers and to two exports of solids can be controlled by the aeration airflow into each chamber and geometrical dimensions like the height of partitions. That is because the change to fluidizing velocity of each chamber leads to the changes in particle entrainment rate and pressure distribution in the EHE. In addition, an empirical correlation between the solid mass flow rate and pressure drop across an orifice has been proposed and a new orifice discharging coefficient has been defined according to the experimental data and theoretical analysis.
A new type of pneumatically controlled EHE was developed in this paper. The flow of solids in EHE with loop seal could be controlled by the aeration airflow into each chamber and geometrical dimensions like the height of partitions. The control mechanisms of solid flow rate were studied.
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subjects | Aeration Airflow Applied sciences Boilers Chambers Chemical engineering Circulating fluidized bed boiler Control of the solid flow rate Energy Energy. Thermal use of fuels Entrainment rate Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc Exact sciences and technology External heat exchanger Heat exchangers Heat exchangers and evaporators Heat transfer Hydrodynamics of contact apparatus Mass flow rate Miscellaneous Orifice discharging coefficient Partitions Seals Solid-solid systems |
title | Gas–solid flow in an integrated external heat exchanger for CFB boiler |
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