FEED OPERATIONS use. The points of use are of two types. 7KH¿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ÀRDGWKHOLTXLGV,QLWLDO SURFHVVLQJ XVHV VWHDP IRU UROOLQJ ÀDNLQJDQGFULPSLQJ7KHPL[LQJV\VWHP UHTXLUHV KHDW IRU OLTXLG OLQH WUDFLQJ DQG OLTXLG ZRUN WDQN KHDWLQJ LPPHGLDWHO\EHIRUHWKHPL[LQJRSHUDWLRQ 7KH SHOOHWLQJ V\VWHP XVHV VWHDP IRU PDVKFRQGLWLRQLQJDVWKHPDVKUHTXLUHV ERWKPRLVWXUHDQGKHDWIRUWKHSURFHVV 2WKHUSRLQWVZKHUHVWHDPPLJKWEHUHTXLUHGDUHOLTXLGZRUNWDQNVDQGOLTXLG OLQHWUDFLQJ Figure 1: Piping system steam harness diagram Pressure regulator W Pilot Flow control valve Recommend 10X Pipe DIA Strainer Pressure gauge Feeder conditioner To waste Steam header Steam separator Trap Drain to atmospheric condensate return system HUDJHRIWRQVSHUKRXUDQGDGGLQJ PRLVWXUH LQ WKH FRQGLWLRQHU DERYH WKH SHOOHWPLOOWKHUHTXLUHGKRUVHSRZHUIRU WKH ERLOHU PD\ EH FDOFXODWHG XVLQJ WKLV IRUPXOD ) WSK[SRXQGVSHUWRQ STEAM INJECTION SRXQGSHUKRXU )RUSRLQWVZKHUHWKHVWHDPLVLQMHFWHG 0 GLUHFWO\ LQWR WKH SURGXFW VXFK DV JUDLQ 5HTXLUHG%RLOHU+RUVHSRZHUIRU3HOFRQGLWLRQLQJ DKHDG RI VWHDP UROOLQJ RU OHW0LOO&RQGLWLRQHU [ ÀDNLQJDQGPDVKFRQGLWLRQLQJDKHDGRI [ KS WKH SHOOHW PLOO WKH ERLOHU VL]H PD\ EH GHWHUPLQHG7KHIROORZLQJIRUPXODPD\ HEAT EXCHANGE EH XVHG WR GHWHUPLQH WKH ERLOHU KRUVH)RUSRLQWVZKHUHWKHVWHDPLVXVHGIRU SRZHUUHTXLUHGIRUVWHDPXVHGLQDSHO- KHDWLQJ DQG WKH FRQGHQVDWH LV UHWXUQHG leting operation: WRWKHERLOHUWKHFDOFXODWLRQVDUHEDVHG RQ WKH DPRXQW RI KHDW EWXV QHHGHG %RLOHUKRUVHSRZHU )[0 WR DGG WKH UHTXLUHG KHDW 2QFH WKH WR[ WDO EWXV DUH GHWHUPLQHG WKH DGGLWLRQDO ) 3RXQGVRIIHHGSHOOHWHGSHUKRXU ERLOHUKRUVHSRZHUQHHGHGIRUWKHVHDS0 3HUFHQWRIPRLVWXUHDVDGHFLPDO SOLFDWLRQVLVGHWHUPLQHGE\WKHWRWDOEWXV WREHDGGHGE\VWHDP QHHGHGGLYLGHGE\WKHKHDWWUDQVIHUFR $QDSSUR[LPDWHFRUUHFWLRQIDF- HI¿FLHQWEHWZHHQWKHVWHDPVLGHDQGWKH WRUIRUPDNHXSZDWHUDWGHJUHHV) SURGXFWVLGHRIWKHKHDWH[FKDQJHPDWH 7KHDPRXQWRIZDWHUHYDSRUDW- ULDOEHWZHHQWKHP7KHDGMXVWHGEWXVUHHGLQRQHKRXUDW)ZKLFKHTXDOV TXLUHGDUHGLYLGHGE\WKHEWXVSURGXFHG RQHERLOHUKRUVHSRZHU LELG SHU ERLOHU KRUVHSRZHU WKH ERLOHU FDQ SURGXFH 7KH WRWDO ERLOHU KRUVHSRZHU )RUDSHOOHWLQJV\VWHPPDNLQJDQDY- UHTXLUHGLVWKHWRWDOKRUVHSRZHUQHHGHG 74 Recommend 20X Pipe DIA Steam addition system IRUDOOWKHDSSOLFDWLRQVVHUYHG,ZRXOG VXJJHVWDGGLQJWRWKLV¿JXUHWRDOORZIRUYDULDQFHVLQWKHV\VWHP¶VPD[LPXPUHTXLUHPHQWV 'HSHQGLQJ RQ SURGXFWLRQ UDWHV UHTXLUHGLQDPLOOLWPLJKWEHZLVHWRXVH WZR ERLOHUV WR VHUYLFH WKH WRWDO VWHDP UHTXLUHPHQWV,IWKHWRWDOFDSDFLW\LVGLYLGHGEHWZHHQWZRERLOHUV\RXDOVRZLOO KDYHWKHDELOLW\WRFRQWLQXHSURGXFWLRQ EXWDWDVORZHUUDWHLIRQHERLOHUIDLOVRU LVWDNHQRXWRIVHUYLFHIRUPDLQWHQDQFH RUDQQXDOLQVSHFWLRQV ,Q WKH QH[W DUWLFOH , ZLOO GHVFULEH WKH VWHDP JHQHUDWLQJ V\VWHP LQ GHWDLO DQG KRZWRGHVLJQIRUDQGPDLQWDLQWKHVWHDP V\VWHP HI¿FLHQF\ 7KLV ZLOO LQFOXGH WKLQJVWRFRQVLGHUZKHQGHVLJQLQJDV\VWHPDQGWKLQJVWKDWPXVWEHDYRLGHGWR PDLQWDLQDQHI¿FLHQWV\VWHP Fred Fairchild is feed science professor emeritus in the Department of Grain Science at Kansas State University. Prior to coming to Kansas State in 1994, he worked in the industry designing, constructing and commissioning numerous mill facilities. He is a licensed professional engineer. He may be reached by e-mail at fjf@k-state.edu. We want to hear from you - Send comments and inquiries to worldgrain@sosland.com. For reprints of WG articles, e-mail reprints@sosland.com. October 2016 / World Grain / www.World-Grain.comhttp://www.World-Grain.com