| 摘要 |
PURPOSE: To measure the flow rate of steam and hot water flowing, in two- phase, through a pipe accurately and continuously for a long term without separating from each other by irradiating the two-phase flow with high speed neutrons and measuring the dose of thermal neutrons generated thereby. CONSTITUTION: A steel pipe 2 feeds a two-phase flow of steam and hot water from a steam production well 1 to a power plant and a differential pressure detector 3 mounted on the steel pipe 2 outputs the pressure drop ΔP of the two-phase flow across an orifice. A computer 7 calculates the flow rate Q of the two-phase flow based on the pressure drop ΔP according to a relationship Q=K (ΔP)<1t2> (K is a constant) between the pressure drop ΔP and the flow rate Q of two-phase flow in the steel pipe 2. Some of the high speed neutrons emitted from a neutron source 4 are decelerated by the two-phase flow in the steel pipe 2 to produce thermal neutrons which are detected by a detector 5 and counted. The computer 7 calculates the dryness (x) of the two-phase flow based on the count (c) and determines the flow rates Q1 , Q2 of steam and hot water based on the dryness (x) and the flow rate Q without separating the steam and hot water from each other. |
