MÔ HÌNH HÓA THỜI GIAN SẤY RIÊNG TRONG SẤY THÓC TĨNH THEO LỚP DẦY pot

Tạp chí Khoa học và Phát triển 2011: Tập 9, số 5: 814 – 822 TRƯỜNG ĐẠI HỌC NÔNG NGHIỆP HÀ NỘI 814 MÔ HÌNH HÓA THỜI GIAN SẤY RIÊNG TRONG SẤY THÓC TĨNH THEO LỚP DẦY Modelling of Specific Drying Time in Stationary Deep-bed Layer Drying of Paddy Đỗ Thái Sơn Bộ môn Kỹ thuật Nhiệt, Trường Đại học Giao thông Vận tải Địa chỉ email tác giả liên lạc: sonnhiet@yahoo.com Ngày gửi bài: 06.08.2011; Ngày chấp nhận: 13.10.2011 TÓM TẮT Nghiên cứu này nhằm đánh giá ảnh hưởng của các điều kiện sấy đối lưu như nhiệt độ và tốc độ khí sấy, chiều dầy lớp hạt và khoảng thời gian đảo gió đến thời gian sấy riêng trong sấy thóc tĩnh theo lớp dầy. Sử dụng phương pháp đáp ứng bề mặt đã xây dựng được mô hình thực nghiệm xác định thời gian sấy riêng có dạng sau: Dt(ph/kga/m 2 ) = 43,424 - 1,905.T - 3,704.V - 0,043.D + 2,44.tĐ + 0,19.TV - 0,027.T.tĐ + 9,27 -03 .D.tĐ + 0,018.T 2 - 27,20.V 2 - 0,067.tĐ 2 . Mô hình này được sử dụng để dự đoán thời gian sấy thóc trong thiết bị sấy vỉ ngang. Từ khóa: mô hình, thóc, thời gian sấy, lớp dầy. SUMMARY This study was conducted to examine the effect of convective drying conditions such as temperature and velocity of drying air, grain bed depth and time reversing drying air to specific drying time in stationary deep-bed layer drying of paddy. Using the Response Surface Methodology to construct a experimental model to determine specific drying time: Dt(ph/kga/m 2 ) = 43,424 - 1,905.T - 3,704.V - 0,043.D + 2,44.tĐ + 0,19.TV - 0,027.T.tĐ + 9,27 -03 .D.tĐ + 0,018.T 2 - 27,20.V 2 - 0,067.tĐ 2 . The use of this formula can predict drying time of paddy in Fixed Flat Batch Dryer. 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Các thí nghiệm khảo sát 9 ' ' *" , 0  L + r./'I?2,?!)2B / ?!) =<  S  *, ? J *=#&#+'=M'I?2 ,?!)]'J*S=# FbJ*tb/, 0,-*3B*')O-*0/-*89' I?2,?!)WM=#:' =>J* Thí nghiệm khảo sát 1H s r ./ ,&J?!)3A # ]82c3Fd&@d* e 8 p\* +)J*ZF$S 0L‰4|Ž€| # ]A‰|Ae~*d?Ac‰4{*A ‰€A~ Mô hình hóa thời gian sấy riêng trong sấy thóc tĩnh theo lớp dầy 817 Thí nghiệm khảo sát 2Hsr ./  ,&J?!)3A*d?82c3Fd&@d* e 8p\* +)J*ZF$S0L‰ |A|~Ž|A4~*d?A‰64 # ]Ac‰4{*A‰€A~ Thí nghiệm khảo sát 3Hsr./ K)LF$3cA*82c3Fd&@d* e 8p\* +)J*ZF$S0Lc‰ 4~Ž~|*A‰64 # ]A‰|Ae~*d?A‰€A~ Thí nghiệm khảo sát 4H s r ./ &•/B/+#3A82cp\* +)J*ZF$S0L ‰€ŽYA‰64 # ]A‰|Ae~*d?Ac‰4{* 2.4. Phương pháp xây dựng mô hình đánh giá đồng ảnh hưởng của T, V, D và tĐ đến Dt l F'F 'F "  *Z 3V •V?F#?V (=‡/V ‚V#K##)A •(‚8  F F'F  ? KG =, =t 0  :+=# =! <" S *9@)KS'*I>*IF•  2 ?  9 ' '  + r ./ 1 /* ? %  + rD/E/'/*?21 'F"<"./‚/K/* /0 ? 3e||~8A ./ •/# 0 ? 3e||x8A ƒ ' ( 0 = p/ ‚u 3e||~8A =# <")I"\:)#'F " *Z; & AB/?!)=<3cA Fd&-d* e 8A@)KSV#6 2, NFt*t/•  3,8A• e 3 , &J ?!)8A • 4  3 K) LF $8 0 • 6  3&#+ B / +# 8A %  ' +r†#E/'I?=# :'=> ?!) _ V# LF K)'F "  =/ ; & !) V# '= = >./ /J*ZFm*; & 9 !F[V#/" N/H ; & ‰β &# ‘ ∑ = 4 1i iki X β ‘ ∑ = 4 1 2 i i i ki X β ‘ ∑ ∑ = += 3 1 4 1i jikj ij XX β   38 =#Hβ &# Aβ & Aβ & Aβ &M '?\:)'M0&9*MV#<- (KV0ˆ?./)2&<3}T‚=JAe||48 4„’Œjskms“^jg 3.1. Ảnh hưởng của nhiệt độ khí sấy đến thời gian sấy riêng Hình 3. Ảnh hưởng của nhiệt độ khí sấy „2:+'J*&+#?'   9  =<hình 3 #!) &  , &J ?!) C 30L , "/ -* ./ &J ?!) &IW8*2?!)CA*C&+ C /)-*=#$=/#0 *#B/?!)=<+**$V# *F)2,+*./c!FK &,&J?!)C0c+*=!J & C  0 :' ~| # ] B / ?!) =< +* 4{Ae7 31 ~Ae6  YA6e Fd&/d* e 8& , &J ?!) C 1 4~ <6~ # ]Ac[ +*  {A7 31 xA{xxAe4Fd&/d* e 8&,&J ?!)C1~|<€| # ]„2:+)9 +JV#&2:+<"./•/# 0 ? 3e||x8 =R  , 0 B / ?!) M+r . )2 r :' => &2'-*=#$3?}#=) !} * ”||8„C,&J?!)L ,)9'b5K`#./ >:'=>?!))9?/0TK`# ?a $ 2 :' => &2 ' -* =# Đõ Thái Sơn 818 $ *  , ?!) C N*0B / ?!)+*N*$mE/AC, &J ?!) \ _/ 0L C  FJ C  0 * , &I \   ?!) ./'LF$=#?!)_V#LF K)?aC<ALF$2FO<0L &J?!),/#?a M•:'?!)–* #f$D)C<V#<" ./v K5v=/0?3e|||8A]#??V0 ?3e||8>,&J?!)+r *$ 2 ' J! 5 ./ $ =#?!) R&JA0 +E,./&J?!)• ,)9'b5K`#3  8./ 3  ‰64Ž~4 # ]"0L,-*./+* 14|Ž478>?a+*9"! =#$&?!)_ * $A F F'F * +* B / ?!)  R ' C  , &J ?!) M&2 r0+* +#! ?+F-*?!)AFJC00>2 F++ #'//*G< 'M2,?!)A ,&J?!)=< 3.2. Ảnh hưởng của tốc độ khí sấy đến thời gian sấy riêng Hình 4. Ảnh hưởng của tốc độ khí sấy „2:+'J* &+#?' e  9=<hình 4#!),&J?!) 38+r2B/?!)=<3c8 V# BF )20L  , 2 < • 0 9* S $ ./ c " 0L ‰ |A|~*d?, &J ?!) C * B / ?!)+*K#$2FO\ 0L&J?!)*:'=> /)-*1  *Z ./ $ C < „  C =# &#+ |A|~Ž|A~*d? > c [ +*|AY7 31 A|4  |AY4Fd&/d* e 8 0 + r./2c=r<=—=& ”|Ae*d? ]G 9 & C 1|Ae 2 |A4~*d?>c+* 6Ax7 31 |A€{  YAFd&/d* e 8 „2 :+ ./ J * &+#?')#!)H&?!)_V# LFK)r,•,)9 'b5K`#./3˜  8>0C  , &J ?!) ?a * !   ?!)  @ < 0 B / ?!) +*  C,&J?!)%*</# CC<0>F+CI?! ,0,'F./:$ >2@)% *,I?S/U 3.3. Ảnh hưởng của chiều dầy lớp hạt đến thời gian sấy riêng „2:+J*&+#?' 4 9 =<>~#!)B/?!)=< 3c8M+r./K)LF$3c8 V#:)N)2J„cC >c%C&I]G9  & c C 1 4~* < ~~* > c [ C eA€7 31 |Ae6 < |A~ Fd&/d* e 8   K) LF $ =# 2 M ?!) _ % J  I ? 9 M C ?!./2 M<B/?!)S# *,*`?aC"0L-* '1=#*`?!)0-* $fN0LK)LF$ _/B/?!)S?afN / 0LK) LF$ 0  ?aC &'*$&K)LF$C Hình 5. Ảnh hưởng của chiều dầy lớp hạt Mô hình hóa thời gian sấy riêng trong sấy thóc tĩnh theo lớp dầy 819 ] K)LF $C * C C ?!?!)A*B/?!)=<C™A B / ?!) S C 0  FJ C C]K)LF$Cb* #'<J0!?!) L+*3f)<$./$#+*A f$ D) C8K#&I?!) \•—=R@)%*,I? F+=#2&200N 2 M?!)_V#LFK) 3.4. Ảnh hưởng của khoảng thời gian đảo gió đến thời gian sấy riêng „2:+J*&+#?'6 9 =<>€ Hình 6. Ảnh hưởng của thời gian đảo gió 9@/#!?!)0+* B/?!)=#:'=>?!)_ V#LFK)>&I9 •:/0/=b./ +#$)<=#S20N 2 M ?!) 0[ / 0L C ?! ?!) 1 eŽ{@d*`>0+#$?a<=! I/#,>0N)'2 M?!) 0[/2&299+#/) 0>+#$+#0/=bS +#$2&*=!I /#,+#OF#,-*E/'LF =#?!)_V#LFK)+* L?S &'  3[ b !F [ e7A V# &2 :+ &+#?'./l/m2m0?Ae||x8 V#&2:+J*&+#?'6>& +*B/+#38?a*B/ ?!) =< 3c8 +* V# K$ * F )2]G9c+*&#+~AY~731 Ax{  YAY Fd&/d* e 8 & +* 1 Y  € 3& ?!)  r  ,  ‰ 64 # ]A  ,&J ?!) ‰ |Ae~*d?A  K) LF$c‰4{*8„+*1xŽ€>  , +* ./ c  xA7 L   , +*~A~7./c3&+*1{Žx80 6Ae73&+*1YŽ{8]F+?) † S/ U B / +#  J F =#?!)_V#LFK)A0> •>c+*0?!)\ !?!) 0N2 M0!0+F"$F0 9*</#CC<>2 I?)%*, &0N2 M?!)0[/ „2 :+ ./ ' J * &+# ?' AeA4A6 # F†F ' '  L + r./1I?2,?!)0L B / ?!) =< ./ :' => ?!)  _V#LFK)9''#K +r\B0*",+r ./+  I ? 2,?!):/ =U )  2  ' J * V# F F'F •(‚ 9 @) KS F =>\:S*'MB/ ?!) =< c * ./ I ? 2,?!)AAc0 3.5. 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Nguyễn Văn Song, Nguyễn Thị Ngọc Thương, Đào Thị Hồng Ngân, Phạm Thị Hương, 823 . kiện sấy đối lưu như nhiệt độ và tốc độ khí sấy, chiều dầy lớp hạt và khoảng thời gian đảo gió đến thời gian sấy riêng trong sấy thóc tĩnh theo lớp dầy. . 0,067.tĐ 2 . Mô hình này được sử dụng để dự đoán thời gian sấy thóc trong thiết bị sấy vỉ ngang. Từ khóa: mô hình, thóc, thời gian sấy, lớp dầy. SUMMARY