管道压损计算

1、KMas卜43的*M电后12%专室CUnkiH隅用卜iTP”F*-PLld*KJ141*-I1*-,工11hnt|睡CV*4P"*JUPi同»，,1TIj.iwuI.tmii-LLMxfa，M.M>|Ma|$L钟1lif.n*-*IjLMH.用、*4Xhfep'"1H|.日:|0H忸7匕IMVJ.71JMlii>-iq-m.IfJf|di*h1Z1.UlM-hO"*g|ill>iM1.|01.Ml1蠢40EII寓展1皿Lull*1哂II*洞Mll.«INI.MF4|4xF餐，l.4lF2K41Id-11AlBMt一M1

2、'i|?派1MT|嘉i>«e!ILK1KlQTSLttngT.fjq.OU|I_ITXW*anQl1HlAtBSCIW*1.，取E骸HlHMU"1毡1.wM"NIL其4*工*f如佻91MLiUd|.-iu'11If-IC'管道压损计算：1.管道中压损:Pp=Pf+Pt+APePp:管道总压降，KPaPf:直管段压降，KPaPt:局部压降，KPaPe：标高变化压降，KPa2.雷诺数（气体在管道内的流动方程）_ududQ（一）Re：雷诺数；：气体密度，Kg/m3（）u：管道内气体的速度，m/sd:管道直径，m:动力粘度，Pa.s:动力粘度

3、，m2/s气体的粘度随温度的增高而增大（液体的粘度随温度的增高而减小），与压力几乎没有关系。空气的粘度壳用下式计算：1.7580*106*-80-*(273-t)3/2380t273t：为气体温度圆管内流动的下限雷诺数：Rec2000直管段压降Pf上包其中摩擦系数应根据流动状态按下面公司计算。di2（1）在工程计算时：Re2000时按流层计算；沿程压损系数:64Re金属管沿程压损系数:75Re橡胶软管沿程压损系数:80ReRe2000时按紊流进行计算:0.3164C0.25Re3.直管段压降PfKo其中摩擦系数应根据流动状态按上面公式计算。Pf：直管段压降，KPa:摩擦系数L:管道长度,md:

4、管道直径，m:气体密度，Kg/m3,20OC时r=1.29u:管道内气体的速度，m/sKo:阻力附件系数,Ko=1.151.204、管道管径与壁厚关系(1)风管的壁厚管壁应有合理的厚度，太薄钢性差，受负压吸力易变形；太厚则浪费钢材不经济。风管壁厚按下表取值：风管壁厚度表3管径D(mm)1006307101000112017001800265028005600管壁厚s(mm)34568(2)当含有熟料及磨损性强的矿物粉尘，且流速15m/s时，风管壁厚适当加大。(3)为防止大型风管的刚度变形，在其长度方向每隔2.5m增加一道加固圈，加固圈可用宽5080,厚度为58mm的扁钢制作。(4)风管的法兰规

5、格，螺栓孔径，数量等均应按表中给定尺寸确定。5、管道阻力计算(1)阻力计算公式风管系统阻力应为管道的摩擦阻力与局部阻力之和：PKo,Pa(3)Dn2入一一圆管摩擦阻力系数；见表L风管长度，m；D风管直径，m；E管件及变径点阻力系数，查工艺手册(下)1418页;u风管中流速，m/s;空气密度，Kg/m3,20c时r=1.29;K0阻力附加系数，Ko=1.151.20;（2）摩擦阻力系数入计算管道内摩擦阻力系数“入”值与介质流动状态、雷诺数Re及管壁粗糙度k等因素有关,对于钢板焊接的管道其摩擦系数入计算如下：2入=1.42/（lg1.274XQ/°X6）（4）入-摩擦阻力系数，mm见表5

6、a、5bQ-管内气体流量，m3/h;U-管内气体流速，m/s;K-管壁粗糙度，mm一般取k=0.1mmK值表4管道类别绝对粗糙度K/mm新无缝或镀锌钢管0.01-0.05轻度腐蚀的无缝钢管0.20.3重度腐蚀的无缝钢管>0.5(0.6-0.7)(5)de当量直径，mK管壁粗糙度，m摩擦阻力系数“入”值表5a管壁粗糙度K=0.0002当量直径（de）0.10.20.30.40.5卜擦阻力系数入值0.0230.0200.0180.0170.016续表5a管壁粗糙度当量直径（de）摩擦阻力系数入值管壁粗糙度当量直径（de）摩擦阻力系数入值K=0.00040.10.028K=0.00040.9-

7、1.00.0160.20.0231.50.0150.30.0212.00.0140.40.0202.5-3.00.0130.50.0193.5-4.00.0120.60.0184.50.01170.7-0.80.0175.00.0115管道有内衬的“入”值表5b当里直径de（mm）焊接的钢烟气管焊接的钢煤粉管<2000.0250.028200-4000.0210.023400-8000.0180.020>8000.0150.017(3)局部阻力系数“七”值该系数指动压头单位的局部损失数，由于气流经各种管件(三通、弯头、变异管、阀门等)流向变换、冲击或流速变化引起的压力损失。清洁气体

8、局部系数按表附录三选用，但带粉尘的局部阻力系数应加以修正，公式如下：-0(1+kjX科)(6)E0-清洁气体局部阻力系数见表Ef-带粉尘的气体局部阻力系数；KJ根据测试确定系数，取0.8-1.0;厂-气体混合物浓度，kg/kg。常用管件和阀件底局部阻力系数m管件和附件名称?值标准查头44<=0.3590%匕=0.7590：方形杳头13180)0转头1.5活接管04弯管全R/d物45)网冏90(105120；1.50.DS0110140160.1750.202.00.7010012014045。6047突然犷大A1/A200.10.20.30.40.50.6D-70.80.91(10.&a

9、mp;1640,4g0.350.25。60.09Q.040+011突然缩小A1/A200.20.30.10.5060.70.80.910.50.470*450.380340.30.250.200.150,090附录9局部阻力系数图形和款画局部取力票数其值以IB内所示的速度计算）0.I0.20.30.40.50.60.70.80.9108进风2.91.91.591.41L.331.251.151.101.071.061.062.91.91.501.301.201.10bOOa1020304090120150圆形0.140.070.040.050.110.20a30矩形0.250.13b100.1

10、20.190.27a37Fi/Foa10152025301.250.020030.050.060.071.500.030.060.100.120.131.750.050.000.140.170.192.000.060.130.200.230.262.250.080.160.260.380.333.500,090.190.300.360.39R/D二中节二埼节三中节二端节五中节二城节八中节二靖节1.00.290.280.240.241.50.250.230.210.21Oh）。'2-C*90a6Oa45e30eCa0.80.60.4北90药头的Hl力京数修正的续表序名9称用形和断面局部U

11、I力系数值以用内所示的速度计算）90。地6彤有A淞EiT6-9OW-1.O)h/b0.320.400.500.530.801.001.2。1.602.002.503.20C0.310.320.310.300.290.280.280.270.260.240.20熨7形呼*於XDI.5D2.0D2.5D3D6D1CD心公5=0.008rrir,1式中“告7.5153060901201501800.0280.0580.110.180.230.270.300.330.0210.0180.0160.0140.0100.0440.0370.0330.0290.0210.0810.0690.0«1

12、0.0540.0380.110.120.100.0910.0640.180.150.130.1250830.200.170.150.130.100.220.190.170.150.110.250.210.180.160.120.0080.060.0300,0510.0660.0760.0840.092合8也为一一7k格声R”F、a=3O际QR1力系数；（Ci/f2但以图内所示it度s/s计算）4/L.Fi/Fi°0.030.050.10.20.30.40.50.60.70.8L00.0«0.100.200.330.50-1.13-0.07-0.3C+1.8210.123.3

13、-1.22-1.00-0.764-0.022.887.34-1.5C-1.35-1.22-0.84+0.0J4-1.4-2.od-1.80-1.70-1.40-0.72-0.12-3.00-2.80-2.6-2.2&-1.44-0.9141.565.213.421.12.704.16-4-0.521.200.360.1429.46.481.890.588.7011.42.563.300.841.1817.34.801.53Cl0.0100.064-0.04-0.IC-0.81-2.IC-4.07-6.600.100.010.100.08*0.04-0.33-1.05-2.1J56O5.

14、400.200.060.100.130.16-o.oe-o.24)-0.71-1.402.303.34-3.59-8.640.330.420.450.480.510.52+0.32+0.07-o.32-0.83-1.47-2.19-4.000.501.401.401.401.361.26l.09|+0.1H0.5C+0.16一。.52-0.82-2.07所号*窗出利新近局都电力墨敷其。/口效以国内助足速度v./tht+WJ9力口卅八f3=30*L：京Elo.z0.3a4a6U,8hOQ口0.2Qt30.40,50.Ed70.a03LQ-LOQ+0.21i.17.613.50幻.230,44L3

15、63.858.0眠7l.Ofl0.46+0.3?1.j2.的4.5H«.42&5115)4.21*3IMastfM+aso1.151.7R26U3. 404. 2Z5.3D札33-L00一6V-Ch2040.阳a,打0.97LJ?L77£14E，2.92TOO-0,62f相frOLOs&口必0.打0.76thE50.R9).89T*s-0.63-0-30-0.08+0l180.350.相0565530.32CL甜-1.QO0,$3-0,)5-0.10+0,JCd片；OlMl.0.4。Oli50.400.2710,露三厂一F石*旧科F"】时初。b立用出飙10.zQ.30.4g.6k8IN0010.2o.a0.10eJ0.fi0,7。祥0,9LOa。d02一0.331.10T15-3.605.40_，+6-10Bi-11.0_1&的0fl-Il0.00.25-0.75L3-2*35-3.40T6l7&