机械搅拌澄清池设计计算.docx
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机械搅拌澄清池设计计算
机械搅拌澄清池设计计算
第一节机械搅拌澄清池计算其特点是利用机械搅拌澄清池的提升作用来完成泥渣回流核接触反应,加药混合后进入第一反应室,与几倍于原水的循环泥渣在叶片的搅动下进行接触反应.然后经叶轮提升到第二反应室继续反应以结成大的颗粒,再经导流室进入分离室沉淀分离.一、二反应室
净产水能力为Q=700m3/h=0.194m3/h
3采用2个池来计算则每池的流量Q,0.097ms,二反应室计算流量一般为出水流量的
/33-5倍.Q,5Q,0.485ms.
2设第二反应室内导流板截面积A=0.02m,u=0.05ms则第二反应区截面积为:
11
/Q0.4852w,,,9.7m1u0.051
,,,,4w,A49.7,0.0211第二反应区内径:
D,,,3.52m13.14,
取第二反应室直径D=3.6m,反应室壁厚,,0.25m11
/D,D,2,,3.6,0.5,4.1m111
/Qt0.485,501,,H,,,2.38mt,50s11w9.71
H—第二反应区高度,m1
考虑构造布置选用H,2.47m,设导流板4块.1
二、导流室
2导流室中导流板截面积:
A,A,0.02m21
2导流室面积:
w,w,9.7m21
2/,,,D14,,,,4w,A,40.02,9.7,22,,,,4,,,,,导流室直径:
D,,,5.4m2,,
取导流室D,5.4m,,,0.1m导流室壁厚.22
/D,D1//2D,D,2,,5.6m,H,,0.65m2222
/Q0.4852,出口面积:
u,0.05msA,,,9.7m63U0.056导流室出口流速:
2A2,9.73则出口截面宽:
H,,,0.65m3/3.145.4,4.1,D,D,,,,,12
/出口垂直高度:
H,2H0.92m33
三、分离室
Q0.0972分离区上升流速取u,0.0009ms,分离室面积:
。
w,,,107.8m32u0.00092
/,D22池总面积:
w,w,,132.42m34
4w4,132.42池的直径:
D,,,12.99m,13m,,
四、池深计算
池中停留时间T设为1.5h。
/3有效容积:
V,3600QT,3600,0.097,1.5,523.8m
/3考虑增加4%的结构容积:
,,V,1,0.04V,544.75mH,0.3m,取池超高。
0
2,D3设池直壁高:
w,H,218.9mH,1.65m。
池直壁部分的容积:
1444
3w,w,V,w,544.75,218.9,325.85m。
231
0取池圆台高度H,2.5m。
池圆台斜边倾角45,则池底部直径5
D,D,2H,13,5,8m。
T5
本池池底采用球壳式结构,取球冠高H,1m。
6
圆台容积
22,,,HDDDD9.42,,,,35TT,,w,,,,,42.25,29.25,20.25,220.45m,,,,,,2322223,,,,,,,,
228,H6球的半径:
R,,8.5m。
球2
H1,,,,236球冠体积:
w,,HR,,3.148.5,,25.64m,,,,36球33,,,,
V3/3。
V,w,w,w,464.99m.V,,447.11m1231.04
447.11,1.5池实际容积:
实际总停留时间:
T,,1.28h523.8
池总高:
H,H,H,H,H,0.3,1.65,1,3.0,5.45m0456
五、配水三角槽
逆水流量增加1%的排泥水量,设槽内流速u,0.7ms。
三角槽直角边长为:
3
1.10Q1.10,0.092B,,,0.381u0.73
三角配水槽采用孔口出流,孔口流速同。
u3
1.10Q1.10,0.0972出水孔总面积=,,0.15mu0.73
4,0.152采用d=0.1m的孔径,每孔面积为0.007854m,19.42个。
则出水孔数=。
2,,0.1
0为施工方便采用沿三角槽每18设置一孔,共20孔,孔口实际流速
1.1,0.097,4u,,0.68ms32,0.1,,20
六、第一反应室
二反应室板厚,,0.15m。
第一反应室上端直径为:
3
/D,D,2B,2,,4.1,2,0.38,2,0.15,5.16m1313
第一反映室高:
/H,H,H,H,,,1.65,2.5,2.47,0.15,2.03m17453
D,D9,5.16T3D,,H,,2.03,9.11m4722
//取u,0.15ms泥渣回流量Q,4Q4
4Q回流缝宽度:
B,,0.094m,取B为0.1m,设裙板厚,,0.06224,Du44
伞形板下端圆柱直径为:
,,,,,D,D,22B,,9.11,22,0.1,0.06,8.7m5424
按等腰三角形计算:
H,D,D,9.11,8.7,0.41m。
845
D,D8.7,8T5H,,,0.35m1022
H,H,H,H,1.53,0.41,0.35,0.77m97810
H8—伞形板下檐圆柱体高度
H10—伞形板离池底高度
H9—伞形板锥部高度
七、容积计算2,H,D,H239510,,,,V,D,DD,D,H,D,DD,D,W,84.44m13355855TT312512
2,,2/3,,,,V,DH,D,DH,B,25.13,20.25,45.38m121121144
/3,,,,V,V,V,V,447.11,84.44,45.38,317.29m3112
V1—第一反应区容积
V2—第二反应区加导流区容积
V3—分离区容积
则实际容积比:
二反应室:
一反应室:
分离室=45.38:
84.44:
317.29=1:
1.86:
6.99
池各室停留时间:
76.876.8第二反应室=,,7.7996,7.8分1,1.86,6.999.85第一反应室=7.796,1.86,14.5分分离室=7.796,6.99,54.5分
其中第一反应室和第二反应室停留时间之和为22.3分。
八、进水系统
进水管选用d,400mm,v,0.8ms6
出水管选用d,400mm
九、集水系统
本池因池径较小部水均匀性本身能达到要求。
采用沿外圆周外侧作环行集水槽形式,
按孔口出水方式,出水水质,小型的采用钢丝网水泥,结构较多,也有采用塑料制作的,但
后者变形大,老化快,造价高,故采用不多。
国外刚制的较多,由于防锈工作量大,故每年
要维修孔。
1孔口:
2q,,,2gh
环行集水槽:
q,0.097,取流速v,0.8ms环
0.097槽宽取0.3m,考虑施工方便槽底取为平底,槽内终点水深h,,0.4m40.8,0.3
32hk槽内起点水深h,,h,0.46m34h4
设槽内水深为0.43m,孔口出流孔口前水位0.05m,孔口出流跌落0.07m,超高0.3m
槽断面高为0.43+0.3+0.05+0.07=0.85m
3Q,0.097ms,槽宽,总出水槽按矩形渠道计算,槽b,0.5m总出水槽:
设计流量内水流流速,槽坡降0.02m。
v,0.8ms
槽内流速:
0.9ms
槽内起点水深:
0.41m
槽内终点水深:
0.43m
设计取用槽内起点水深为0.4m终点为0.45m,超高0.3m,h=0.45+0.3=0.75m孔口出流:
0.6,1.20.1146,0.8,0.06,0.025v,msq,Q,,,h,md,m孔
q2将塑料剔除集水孔的直径为32,孔口面积0.135mmf,,m
2,9.81,0.06
f0.135孔口数目:
n,,,68.6个孔2,d,3.140.025
设计采用孔口数为69个。
十、排泥及排水计算
污泥浓缩室总容积据经验按池总容积1%考虑
/3v,0.01v,0.01,447.11,4.4711m4
3v,2.235m斗
污泥斗上底面积:
22S,1.5,1.1,,1.5,h,1.89m,h,0.24m斗斗上3
下底面积:
2S,0.225,0.225,0.05m下
2,3.23污泥斗容积:
,,v,1.89,0.05,1.89,0.05,4.9m斗3
污泥斗容积是池容积的1%。
排泥周期:
90190290390490590690790890990S,S14
19190.459.24435.129.124.921.719.317.35T0
排泥历时:
2设污泥斗排泥直径dg100,其断面wt,106.98s=0.00785m,管长5m,排泥历时010
放空时间:
2设池底中心排空直径dg250mm,w,0.04909m,管长15m,瞬时排泥量:
02
/3。
q,uw2gH,0.23ms202
1544,,/////222,,t,2kH,H,2kDH,DHctga,Hctga21111,,放空时间:
TT1235,,
3,,442.52,,,,,2,13365.5,3.85,2,7.8564,5.5,,8,5.5,,5.5,,35,,
1.79h
十一、机械搅拌澄清池,搅拌机计算
1、提升叶轮
60Q60,0.46出口宽度:
B,,,0.23m123,9.2,2.08Cnd
33c,3,Q,5Q,5,0.092ms,0.46m,叶轮转速:
sn,9.2rmin.1叶轮外径:
d,2.08,叶轮外线流速:
m1ms
QH1000,0.46,0.051叶轮提升消耗功率:
N,,,3.68kw1102n102,0.6
2、桨叶
,,Wh桨叶消耗功率:
N,CR,RZ,0.527kw344400g212
C,阻力系数一般取0.3
W,叶轮旋转角速度0.96
h,桨叶高度(一般为一反应室的0.3,0.5)取1.7m
0.9dR,桨叶外半径R,,0.94m211
R,内半径R,0.94,0.58,0.36m22Z,桨叶数6片
1b,桨叶宽度b,h,0.58m3
提升和搅拌功率N,N,N,0.527,3.68,4.21kw21
3、驱动
电动机功率:
采用自锁蜗杆时
电磁调速电动机效率为0.8,三角皮带传动效率为0.96,蜗轮减速器效率为0.7,轴承
效率为0.9,则总效率为前面所有效率相乘既0.48
十二、刮泥机计算
采用悬挂式中心传动刮泥机:
刮泥机外缘直径为7.5m,外线流速:
3mmin
功率计算:
刮泥机悬挂部件的重力w=10000N,旋转支承的钢球直径为3.2m,滚动摩擦力臂
w10000K=0.05cm安全系数为3旋转时的阻力p,,2kn,,2,0.05,3,937.5N1d3.2
V,n,D,0.1,,,0.5,0.157mmin球臂球
937.5,0.157PV设钢球槽的中心圆直径为0.5m。
1球旋转功率。
N,,,0.0024kw16000060000
,23澄清池有效容积:
V,DH,,8,4.65,233.6m池44
V233.63进水量:
Q,,,155.74mhT1.28
6,63干污泥量:
Q,Q,SS,,%,10,155.74,30,0.4,10,0.0187mh干
3干污泥量换算成含水率为98%的污泥量为0.93mh。
D,,7.5板刮泥机每转所需时间:
t,,,7.85minr,0.3hrv3
刮泥机每转的刮泥量p,Q,g,1000,0.13,1.03,9.81,0.1,1000,131.36N2固
23,P2刮泥机功率:
N,,0.0044KW260000
设刮板按2/3的直线处线速度为2mmin。
N,N0.0024,0.004412电动机功率为:
W,,,0.014kw电N0.5
标准代号S774
(一)S774
(二)S774(三)S774(四)S774(五)S774(六)S774(七)S774(八)参数
直径(m)222.52.23.53.54.54.5叶
转速4.8-14.548-14.53.8-11.43.8-17.42.86-8.572.86-8.572.07-6.222.07-6.22(r/min)
外缘线速(?
)0.5-1.50.5-1.50-5-1.50.5-1.50.5-1.50.5-1.50.5-1.50.5-1.5轮开度(?
)0-1100-1700-1750-2400-2300.-2900-3000-410搅拌桨外缘线速0.3-1.00.3-1.00.3-1.00.3-1.00.3-1.00.3-1.00.3-1.00.3-1.0(m/s)
型号JZT32-4JZT32-4JZT41-4JZT41-4JZT42-4JZT42-4JZT51-4JZT51-4电动功率(KW)33445.55.57.57.5机转速(r/min)120-1200120-1200120-1200120-12001.2-12001.2-1200120-1200120-1200速皮带减速器1.21.21.571.57222.682.68
蜗轮减速器6969676770707272
总速比82.882.8105.2105.2140140192.96192.96比
重量(kg)19001900225522603828382867506750
本机械搅拌澄清池的搅拌机和刮泥机同S774(三)型。