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Abstrak :
Mincrcilisasi .sziifida ycmg rc:-sebcii' sccum lmlxis pads: bijih eincis Minc:/:asa dapfil ineizyebabkan kadar perolehun (recoverjv) partike! emas nieiymli rendah jiku bi/‘in langszing dicksrraksi dengan lcirznun siunidu. Old: kcirena ini, sebehnn sianidasi inaka perlu dilakulmn pre-Ireainzeni processing berupa pemnnggangcm (roast ing) nnluk nzenzbentiik nmlriks mineral yang beipori dan niernisahkun pnrlike/ emas duri mineral pengoiornyu. Hal ini nremzingkinkun siunidu dapcii melarzirkan seccira seleknf seiiap prirlikel emus yang lerkcnnlung dcilam mineraf snffida iensebul. Konilisi uknial di Iupungun memmjnkkan bahwa banyaknyu pammeler inueraxi CFB Ruuxring Plant yung hurux dikunlrm' secure: optimal dan .veimbung .wesuui dengun .vlundur qperuxinya nrztul: rneningkxnkun ejixienxi dun cg/éklyitus pmdu/:si caicine Ierkadang memungkinkun lerjadinya perbedaan pemahumun anim- operalor dulanz pengoperusiunnyu sehingga dirasakan kineiju roasler kurang oprimai. Salah .varu indikusinya adalah rendahnya luju _neriguinpanan ore ke dalam rooster' (I 05-H19 mnnes per hour) dari de_s-ain malariinum yang diirinkan (120 girly.

l /nruk nzengoptimusikan lqiu pengzmlpancm roasrer hingga mcncapai desain :na/nsinzumnya sccara nyaia di /apangan, di/akukcm .main simulasi p/‘oses unruk meraniuikan dan menganfiliscr secara q/élciif qfck keijc: yang akan lerjczdi. /Inalisa slaiistik dengan metode iinze series dan regresi dquergzmakan unruk inenggrnnbarkan kondisi operfisioncil roasler yang inenglzasi/kcm nzodel persaincian inafematika.

Hurgu parameier sfuiisfiik R-.squared uniuk model muremrniku regresi bergandu yang dihusi/kan udrilri/1 sebesar 0,63 yang berarii balzwn 63 % bervariasinya selpuinl IQ/`u pengumpunan rauster mampu dijeluskun ole/1 variasi dam independent variablex-nya. Parameter ruczsler _vang periu diperiimhimgknn dulam meneritnlmri lagu perzgumpununnyu /nn-Izmir - iurui duri yung Ierknu! uduluh Op ¢#gus, C() qfjlgux, primary air flow, di/_kreriliul prexxnre dan kicroxene _/hr primary air healer. Sedangkan roasler lop lenqzeralure dun coal tonnage liduk .wigni/ikun mempengaruhi sefpoint luju pengumpurum roaxler. Berdun-urkan unulisa .i'rrni_s'tik regresi yang dilalcukun dcrpat direkomendasikan balzwa Iaju pengumpanan roasrer' daianz ]1cr1gopci'usianr9/cr Iayuk untuk dirclapkan scsuui dengan desain nzalcsimurmzycz yaitu .ve/Jesar 120 lpn naman lzmus ieiap irzeinper/zari/mn batasun uperasi kriris dan kcmcmqnurm uni! opcrasi penurgicnzgnyci.

Abstrak :
A three-dimensional Eulerian Multi-Fluid Model (MFM) of biomass gasification in full-loop Circulating Fluidized Beds (CFBs) has been developed. The conservation equations of mass, momentum, and energy are solved by well-known Navier-Stokes formulation types. The Kinetic Theory of Granular Flow (KTGF), common chemical reactions in biomass gasification, and standard k-ε turbulence model are considered. These equations are used to describe the spatial velocity, temperature, and concentration for each phase and species. The inter-solid phase heat-transfer mechanisms, which consist of direct solid-solid conduction and solid-solid conduction through fluid medium, are also considered. The results are compared to existing experimental data. It is demonstrated that the model which considers all inter-solid phase heattransfer mechanisms provides better predictions in terms of synthetic gas (syngas) compositions than the model considering direct solid-solid conduction through contact area only and the model without solid-solid heat-transfer mechanisms. From this, hydrodynamics and heat and mass transfer inside this complex system are analyzed. The results can be useful for better design and optimization of biomass gasification in CFBs.