根据气力输送的特点,降低动力消耗,节约能源是一个重要的研究课题,从经验中知,管道内径是关于能耗的重要参数。直观上看,当输送量一定时,管径过小,输送易阻滞,管径过大,虽输送畅通,但又造成能量的浪费。根据经验,把管径分成三组,各组的试验结果如下表所示,试用方差分析法比较各组的效果.
管径(mm) | 单位功耗 |
230 | 0.0308,0.0476,0.0504 |
250~260 | 0.0532,0.032,0.0218,0.028,0.028, 0.042,0.0336,0.042,0.042,0.028 |
280~320 | 0.07,0.07,0.0644,0.0312,0.0756,0.0756, 0.07,0.0588,0.0588,0.042,0.0308,0.0364, 0.0448,0.21,0.154,0.1064,0.1288,0.112, 0.1064,0.1288,0.0756,0.0644,0.0504,0.0644, 0.0504,0.0308 |
A.管径
B.工作压力
C.流量
D.长度
E.管材质
A.工作温度大于370℃的碳素钢和铁素体不锈钢管道,一般应选择有代表性的部位进行金相和硬度检验抽查
B.工作温度大于220℃的输送临氢介质的碳钢和低合金钢管道,一般应选择有代表性的部位进行金相和硬度检验抽查
C.对于使用寿命接近或已经超过设计寿命的管道,检验时应进行金相检验或硬度检验,必要时应取样进行力学性能试验或化学成分分析
D.对于工作介质含湿H2S或介质可能引起应力腐蚀的碳钢和低合金钢管道,一般应选择有代表性的部位进行金相和硬度检验抽查
A.有明显腐蚀和冲刷减薄的弯头、三通、管径突变部位,不包括相邻直管部位
B.需重点管理的管道,其他没有要求
C.需重点管理的管道,其他管道的弯头、三通、管径突变部位及相邻直管部位
D.需重点管理的管道或有明显腐蚀和冲刷减薄的弯头、三通、管径突变部位及相邻直管部位