Vol.27 No.1 向飞等：小麦流态化干燥实验关联式及在热泵流化床谷物干燥中的应用 ◆113 Wheat drying correlation and their applications in a fluidized bed dryer with heat pump XIANG Fei,YANG Jing,WANG Li,TONG Lige Department of Thermal Engineering,Mechanical Engineering School,University of Science and Technology Beijing,Beijing,100083,China ABSTRACT Based on the fluidized bed theory,a series of thin layer wheat drying experiments were carried out in an electric drying oven with gentle breeze in it to simulate the wheat drying process in fluidized bed.As a result, the wheat drying correlation was devel oped from those experiment data for predicting the wheat drying time in flu- idized bed.An experiment system combining fluidized bed with heat pump was designed and experiments on which indicated that the correlation could predict the drying time reasonably.Further economical analysis proved the effi- ciency and a promising future of the fluidized bed drying with heat pump. KEY WORDS wheat;fluidization;regression;heat pump;drying (上接第23页) Research on treatment of landfill leachates by flocculation-adsorption ZHANG Futao 2,FANG Shaoming,SONG Quanyuan 1)Civil and Environmental Engineering School,University of Science and Technology Beijing,Beijing 100083,China 2)College of Materials and Metallurgy,Northeastern University,Shenyang 110004,China 3)Department of Chemical Engineering,Zhengzhou Institute of Light Industry,Zhengzhou 450002,China ABSTRACT Landfill leachate,whose main pollutants are organic matter,heavy metals and ammoniacal nitrogen, is a kind of poisonous,harmful and organic wastewater.The pretreatment of landfill leachate by flocculation-adsor- ption was investigated.Polyaluminium chloride(PAC)was used as the flocculant and its optimum dosage was 500 mg/L.The adsorbent was self-made modified bentonite.Experimental results showed that approximately 79%of CODe,and 46%of ammoniacal nitrogen were removed.As to heavy metals,the removal ratios were from 53%to 98%according to different kinds of landfill leachate. KEY WORDS leachate;pretreatment;polyaluminium chloride;modified bentonite、 b 】 . 2 7 N o. 1 向飞 等 : 小麦流 态化 干燥 实验关 联式 及在热 泵流 化床 谷物 干燥 中的应 用 . 1 13 . Wh e at dry i n g e o r e l at i o n an d th e i r aP P li e at i o n s in a fl u id i z e d b e d d ry e r w ith h e at p l l P J 砚咬N G Fe i, YA N G Ji n g , 环勺万G L i, 刃ON G L ige D e Par ot l e n t o f T h e n n a 1 E n g ien e n n g , M e e h画 e a 1 E n g l n e e r ln g s ch o l , U O i v m ity of s e i en ce an d eT e b n o 】o gy B e ij ign , B e ij in g , 10 00 83 , hC in a A B S T R A C T B as e d o n ht e fl u i d iZ e d b e d ht e o 仁转 a s e ir e s o f t h l n l ay er hw e at 勿ign e xP e nm e in s w er e a 币e d o u t in an e l e e itr c d习功9 o v en iw ht g e n t l e b r e ez e in it t o s如ul ate hte w h e at 勿ign P r o e e s s in fl u 1id z e d b e d . A s a r e s ult , ht e hw e at d叮ign c o er l at i o n was d e v e l op e d fr o m ht o s e e x p emn ent d at a for P r e id e t ign het hw e at 勿ign t im e in flu - i d i z e d be d . iA l e x P e n m ent s y s t em e om b加gn fl u i d i z e d b e d w iht h e at P钊m P w as de s ign e d an d e xP e ir m e in s o n w h i ch i n d i e aet d ht at het e o 甘e l at i on e o u l d P r e d i e t ht e 勿ign t im e r e a s on ab l.y F u rt h er e e o n o m i e al an aly s i s P r o v e d ht e e if - c i e cn y an d a P r o m i s i gn 加 ut r e o f ht e fl u id i z e d b e d d尽ign iw ht h e at P um P . K E Y W O R D S hw e at ; fl ul d iaz t i o n ; er 笋 s s ion ; h e at p um p ; d珍ign ( 上接 第 23 页 ) R e s e ar e h o n tr e a t m e n t o f lan d if ll l e a c h at e s b y fl o e c ul at i o n 一 a d s o rp t i o n 乙E 戒刃G uF at o ’ ,)z FA N G hS ao m i力扩), S ON G Q u a 叹v u a 刀 l , l ) Civi l an d nE v ior mn e n at 1 E n g ien e n n g S e h o o l , t j n i v e rs ity o f S e i enc e an d eT c hn o l o gy B e ij in g, B e ij ign l 0 0 0 83 , C h in a 2 ) C o ll e g e o f M a t e r i a l s an d M e at ll u 雌异 l N o rt h e as t e rn nU i v e rs i ty, S h e yn an g l l 0 0 04 , hC in a 3 ) D eP 田七n e nt o f 以em i e 时 E D g in e e r川g , hZ e n g 山o u ih st itu te o f L i gh t l n d u s t巧、 Z h e n g劝o u 4 50 0 0 2 , C h in a A B S T R A C T L an d if ll l e ac h ate , w h o s e m ian P o l l u tan t s aer o gr 咖 e m at er, h e a v y m e at l s an d aJ叮们 n o n i ac a l n itr o g en , 1 5 a k i n d o f P o i s o no u s , h a n n fu l a n d o gr a n l c 、 v a ` t e w a t e .r hT e P r e tr e a h n en t o f l an idf 川 e ac h aet by fl o e e u l iat o -n ad s or - P t i o n aws ivn e s it g aet d . P o ly al um in i um e hl ior d e (PA C ) aws us e d as ht e fl o e e u l an t an d ist o P t lm um d o s ag e w as 50 0 m g/ L . T h e ad s o br e n t 、 v a s s e l -f m a d e m o d iif e d b e n to n i t e . E x P e r 庄n e ant l er s ul t s s h o w e d ht at ap P r o x im at e ly 7 9% o f C O cD , an d 4 6% o f aj rn 们。 o 山ac a l in otr g e n 协℃ r e r e r n o ve d . A s ot h e a V y m e at l s , ht e er m vao l art i o s w er e fr o m 5 3% t o 9 8% ac e o dr in g ot d i fe er n t k i n d s o f lan d if l l l ae e h a t e . K E Y W O R D S l e ac h a t e ; P er etr a lt n e n t : P o l y al um i in um e ih o ir d e : m o d i if e d b e n t o n iet