A Pham Hoang Luong creator Bhattacharya, Sribas C. Chairperson Mora, J. C. Examination Committee Prida Wibulswas Examination Committee The Government of France Scholarship Donor Environmental and Energy Management Agency (ADEME, France) Scholarship Donor text th Bangkok Asian Institute of Technology 1992 continuing eng 126 leaves : ill. This report ii:; concerned with some aspects of hydrodynarni cs and heat transfer i n circn]at:ing f] u:idizecl heel as wel J as cornhnst:ion in jnclust.rial fl uidized bed boi ler. Experimental study on hydrodynamics and heat transfer in ci.rculating fJ1d clizecl heel were done hy 1Hd ng siJ:ica sand as tlH-! heel material. The co ld nm work was done to 8tucl y t he effects of riser flow rate, aeration flow rate, total lied inventory, lHlrticJe size, bed geometrical dlmensio11 and L · valve configu ration on solid circul ation rate. The hot. experiments were carried ou t lo study t he variation of bed-to-wall overall beat transf r coef f icent corei:;ponding to c hanyeH of operating parameters and location along the vert.:ical length of the riser. Relevent mathematical correlation!' for solid circulation rate a nd locaJ. heat transfer coefficient were developed as res ults of practical stud y. In the range of I.he present. work , heat transfer coefficient iii t he dilute phnse is fou nd to be in t 11e range of 62 W/m2 K to 83 W/n/K, 51 W/ in2 K to 74 W/ rn1 K, and 50 W/m1 K to 59 W/rn1 K for sand size of 200 i1n1 , 400 p 111 aJJ d 500 lllH , respect.i vel y. An at.tempt to modify a 1nat.he111 atica l 1node l for predicti on of heat t.rrrnsfer coefficient. in circ u] at:ing fl uidized heel was made l>y consi<leri 11g the effect. of formation and disin tegration ot clusters in circulating fl11idi zed bed. Proper .forn111 la e were-! set np to predict. Joc1-1J coJJvect:i on heat transfer coefficient u11 der present work conditioni:;. To valid<1t.e the rnodel developed, compar:i son !>et.ween experimental observations and t heoretica l predict.ion rel:mlts wai:; made. Alt.hough hi.gher heat. transfer coefficient was obtajned from t he model (in the range of 92 W/m1 K to 122 W/ rn1 K), 'the experiment.al observations and the theoretical prediction results slww qua] j tat.) ve i1greernen t. Combustion of No 4 fine coal (Viet nam specif icat.ion ) was carried out on an :i.rnh1str:ial fJuidjzed bed hoiler hi Viet nam to estfoat.e t.hc boiler overall and cornbni:;t.ion efficie11 cies . The estimated combustion ef ficlency was i JJ 1.lie range of 79. 596 - 81 . 4% and the overa] l boiJ.rn· efficiency was around 70%. A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering Thesis (M.Eng.) - Asian Institute of Technology Fluidization Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B16260 http://203.159.5.9/ait-thesis/detail.php?q=B16260 290998 20260818223033.0