挡板宽度:B=0.1D=0.19 m 搅拌叶间距:S=2 D i =1.27 m 搅拌叶与罐底距离:C= D i = 0.63 m
C +2S =0.63+2×1.27=3.17 m > HL
C + S =0.63+1×1.27=1.9 m < HL ∴取2层搅拌器 令流体为牛顿型流体,符合全挡板条件:
ρ=1050㎏/ m n=140r/min μ=0.1 N S/㎡ 则:Rem= Di2ρn/μ
=0.632×140×1050/(60×0.1) =9.72×103>4000 属过渡流
采用2层六箭叶搅拌浆叶,查《发酵设备》,Np=3.7
轴功率:P0 = Np Di5ρn3
=3.7×0.635×(140/60)3×1050 =49 kW
f校正=1/3[(D/ D i)(HL /D i)]1/2=1.22 ∴实际轴功率P*= f校正×P0
=1.22×4.9 =5.98 kW
两层搅拌功率 P=P×[1+0.6×(2-1)]=9.56 kW
电机功率 N电=1.02 Pg/(η1η2η3 )=10.58kW
η1 =0.95(皮带) η2 =0.98(轴皮带) η3 =0.99(轴)
电机选型: 选用Y180-6型电机 功率:15 kW
转数:970 r/min,效率:89.5%
检验:15×89.5%=13.425 kW>N电
* 3
∴选型合适
7.1.5 中罐配料罐 7.1.5.1 几何尺寸
η0=0.6 ρ=107 ㎏s2/ m4 n=140 r/min μ=0.0102 ㎏ S/㎡ V配料=2.870 m3
V V= V 7.1.5.2 C +S =0.56+1.12=1.32m RV罐= V配料/η0=2.870/0.6=4.78 m3
选1个配料罐
取V1=3.5 m3 令H0/D=2
1=π/4 D2H0=3.5
∴ D=1.31m H0=2D=2.62m 又∵Ha=1/4D=0.42 m H b=0.025 m
封头容积 V2 =π/4 D2(H b +1/6D)
=π/4×1.312×(0.025+1/6×1.31) =0.33 m3
1+ 2V2 = 3.5+2×0.33=4.16 m3
∴假设合理。
罐体总高:H= H0+2(Ha+ H b )=2.62+2×(0.332+0.025)=3.33 m 液柱高:HL = H0η+ Ha+ H b=2.62×0.6+0.33+0.025=1.93 m 搅拌器功率
搅拌器直径:D i =1/3D =0.44 m 挡板宽度:B=0.1D=0.13 m 搅拌叶间距:S=2 D i =0.88 m 搅拌叶与罐底距离:C= D i = 0.44 m
< HL ∴取2层搅拌器 e = D2 iρn/μ
=0.562×140×1050/60×0.01
=4743.2>4000 属过渡流
采用2层六箭叶搅拌浆叶,查《发酵设备》,Np=3.7
轴功率: P0 = Np Di5ρn3
=3.7×0.445×(140/60)3×1050 =0.814 kW
f校正=1/3[(D/ D i)(HL /D i)]=1.20 ∴实际轴功率P*= f校正×P0=1.21×0.814=0.977 kW
两层搅拌功率 P=P* ×[1+0.6×(2-1)]=1.56 kW
电机功率 N电 = P*×1.02/η1η2η3
=0.977×1.02/0.95×0.98×0.99 =1.08 kW
η1 =0.95(皮带) η2 =0.98(轴皮带) η3 =0.99(轴) 电机选型:选用Y112M-6型电机
功率:2.2 kW,转数:940 r/min,效率:80.5%
检验:2.2×80.5%=1.771 kW>N电
∴选型合适
7.1.6 小罐配料罐 7.1.6.1 几何尺寸
η0=0.6 n=130r/min 物料20 ℃ V配料=0.293m3
V罐= V配料/η0=0.293/0.6=0.488 m3 取V0=0.5 m3
取V1=0.41 m3 令H0/D=2
V1=π/4 D2H0=0.41
∴ D=0.64m H0=2D=1.28m 又∵Ha=1/4D=0.16m H b=0.025m
1/2
封头容积 V2 =π/4 D2(H b +1/6D)
=π/4×0.632×(0.025+1/6×0.63) =0.066 m3
校核 V= V1+ 2V2 = 0.42+2×0.066=0.552 m3
7.1.6.2 C +2S =0.21+2 R ∴假设合理。
罐体总高:H= H0+2(Ha+ H b )=1.28+2×(0.16+0.025)=1.65 m 液柱高:HL = H0η+ Ha+ H b=1.28×0.6+0.16+0.025=0.953 m 搅拌器功率
搅拌器直径:D i =1/3D =0.21 m 挡板宽度:B=0.1D=0.064 m 搅拌叶间距:S=2 D i =0.42 m 搅拌叶与罐底距离:C= D i = 0.21 m C + S =0.21+0.43=0.64m < HL
×0.43=1.07m >HL ∴取2层搅拌器 2e = D iρn/μ
=0.212×140×1050/(60×0.1) =1080<104
采用六箭叶涡轮搅拌器,查《发酵设备》,Np=3.7 轴功率:P50= Np Diρn3
=3.7×0.215
×(140/60)3
×1050 =0.0202 kW
f校正=1/3[(D/ D i)(HL /D i)]1/2=1.24
∴实际轴功率P*= f校正×P0=1.24×0.0202=0.025 kW
N电= P0×1.01/η1η2η
3
=0.0202×1.01/(0.95×0.98×0.99) =0.022 kW
η1 =0.95(皮带) η2 =0.98(轴皮带) η3 =0.99(轴)
电机选型:选用Y90S-6型电机
功率:0.75kW,转数:910r/min,效率:72.5%
检验:0.75×72.5%=0.54kW>N电
∴选型合适
7.1.7 大罐配料罐——发酵罐 7.1.7.1 管道
令Ws=1m/s,打料时间t=80min,
V配=π/4 D2Wst=19.34m3
∴D=0.072m
查《化工原理》,取φ80×3.0㎜
检验: Ws =4V/(πD2t)
=4×19.34/π×0.0722×80×60 =0.99m/s
∴符合要求
流量:Q=π/4 D2Ws
=π/4×0.0992×0.98×3600 =14.51m3/h
7.1.7.2 泵
查《化工原理》,选F65-25型泵
流量:28.8 m3/h,扬程:25 m,转数:2960 r/min,
轴功率:3.17 kW,重量:49 kg
N电:5.5kW,效率:62%,叶轮外径:D=1118㎜
7.1.8 中罐配料罐——中罐 7.1.8.1 管道
令Ws=1 m/s,打料时间t=50 min,