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一、引言 燃气流量的计量,在生产、输配和经济管理方面是个重要环节;特别对大口径管道,大流量的计量,一直是一个急待解决的问题。现将城市燃气流量计量在输配工程中的特点简介如下: (1)气体流量大,管径口径大; (2)流量变化范围大。小时流量最大值与最小值之比值可超过3。 (3)在输送过程中,要求计量仪表压力损失越小越好或无压力损失; (4)在安装和维修仪表时,要求不中断供气。 基于上述原因。为解决这一问题,我们
I. INTRODUCTION Measurement of gas flow is an important link in production, transmission and distribution and economic management. Especially for the measurement of large-diameter pipes and large flow, it has always been an urgent issue to be solved. Now the city gas flow measurement in the transmission and distribution engineering characteristics are as follows: (1) gas flow, diameter caliber; (2) flow range. The ratio of hourly maximum to minimum value can exceed 3. (3) In the process of transportation, the pressure loss of measuring instrument should be as small as possible or without pressure loss; (4) During the process of installation and maintenance of instrument, it is required not to interrupt gas supply. For these reasons. To solve this problem, we