What should be paid attention to when Low price steam vortex flow meter from China manufacturer measures steam? What is a good method to install a steam vortex flow meter to measure steam? Can steam vortex flow meter be used for steam charge metering? The Low price steam vortex flow meter from China manufacturer is used to evaluate its measurement performance under the single-phase flow condition. At present, there is no evaluation standard for the system change when the flow meter calibrated with single-phase flow is used to measure two-phase flow. However, two-phase flow exists objectively, and its impact on flow measurement can not be avoided. Although there are many difficulties, people are still trying to study the mechanism of its impact on flow measurement, and take corresponding countermeasures to improve the accuracy of flow measurement.

1、 Measurement difficulties of Low price steam vortex flow meter from China manufacturer

During long-distance transportation, dry steam will be partially condensed due to heat loss, which will reduce the dryness of steam and turn into wet steam. The gas-liquid two-phase flow structure in the horizontal pipe is related to the gas-liquid two-phase volume ratio and flow velocity. In the steam pipe, the volume ratio of condensate in the wet steam is very small after all, which makes the drain pipe from the bottom of the horizontal pipe receive good drainage effect. When the flow velocity is particularly high, it will also show annular flow, that is, there is a liquid film on the pipe wall, and the central part of the pipe is a gas core with droplets. Due to the influence of gravity during horizontal flow, the lower liquid film is thicker than the upper pipe wall. In the vertical rising pipe, the basic structures of gas-liquid two-phase flow include bubble flow structure, elastic flow structure, block flow structure, annular flow structure with fibers and annular flow structure. However, due to the small volume of condensate in the wet steam, the flow of excess water in the rising pipe often shows an annular flow structure, but when the water carrying capacity is particularly large, it also shows an annular flow structure with fibers. Among them, the fibrous fluid is actually a strip of condensate. Flow in vertical downward pipeline: in vertical downward pipeline, the structure of gas-liquid two-phase flow is very similar to that of vertical upward flow, but there are differences. Not only the flow direction is opposite, but also under the same average flow velocity, the flow velocity of liquid in vertical downward pipeline is much faster than that in vertical upward pipeline.

2、 Precautions for measurement of Low price steam vortex flow meter from China manufacturer

Low price steam vortex flow meter from China manufacturer should be reasonably arranged with steam traps if it wants to measure steam accurately: it has long been found that when there is more water in the steam, the steam vortex flow meter will have a "leakage pulse", that is, when the steam flow rate is stable, the Low price steam vortex flow meter from China manufacturer should have a stable pulse output proportional to the flow rate. However, it is sometimes found that the output pulses of the instrument are mysteriously less. From the distribution of the recorded output pulses in the two-dimensional coordinates, it can be clearly seen that the pulses that should be approximately evenly distributed are one less pulse at a certain place. In serious cases, there are many fewer pulses, and in the most serious cases, there are no pulses at all. This may be related to the fact that large droplets with uneven distribution impinge on the vortex generator and inhibit the formation of vortex trains.