Characteristics and principles of balanced flow meters

Project Overview

Supmea Measurement and Control HSP series balance flow meter is a new type of differential pressure flow meter. It adopts a unique Reynolds number, increases the thickness of the throttling part and processing accuracy, so that the flow performance is close to Venturi, and the structure is simple and safe. , a qualitative leap in performance, and the clever structural design can exchange a relatively small permanent pressure loss for a larger stable differential pressure value under the shortest straight pipe section requirement, achieving high-precision long-term stable measurement. Compared with the traditional throttling device, it has certain improvements.

1. Features

(1) High linearity and good repeatability: The balanced flow sensor has the characteristics of a symmetrical porous structure, which can balance the flow field and reduce eddy current, vibration and The signal noise and flow field stability are greatly improved, the linearity is improved by 5 to 10 times compared with the orifice plate, and the repeatability is increased to 0.15%.

(2) Low requirements for straight pipe sections: Due to the stable flow field and pressure recovery twice as fast as the orifice plate, the balanced flow sensor greatly shortens the requirements for straight pipe sections. The front and rear straight pipe sections are generally the front ones. After 3D, 1D can be at least less than 0.5D, thereby eliminating a large number of straight pipe sections.

(3) Small permanent pressure loss: The porous symmetrical balance design reduces the formation of turbulent shear force and vortex, and reduces the loss of kinetic energy. Under the same measurement conditions, it is better than the orifice plate. The permanent pressure loss is reduced by 2.5 times, thus saving considerable operating energy costs.

(4) Resistant to dirt and not easy to block: The porous symmetrical balance design reduces the formation of turbulent shear force and vortex, thereby greatly reducing the formation of stagnant dead zones and ensuring the smooth passage of dirty media Multiple holes reduce the chance of fluid holes getting clogged.

(5) The orifice plate can be directly replaced: it has the same usage method and appearance as the orifice plate, so it can be directly replaced without any changes in piping and related instruments, upgrading enterprise instruments. Renovation saves costs.

(6) Wide flow measurement range: According to the test results, we learned that: the performance of the balanced flow meter can be from the minimum to the speed of sound; its minimum Reynolds number can be lower than 200, and its maximum Reynolds number Greater than 107; B value can be selected from 0.25 to 0.90.

(7) Good long-term stability: Due to the obvious reduction of turbulent shear force, the direct friction between the medium and the throttling member is greatly reduced, and its B value remains unchanged for a long time. The meter has no moving parts, so it maintains long-term stability.

(8) Measurable high-temperature and high-pressure media: Like orifice plates and other throttling devices, the working temperature and pressure depend on the material and grade of the pipe and flange. The working temperature can reach 550°C, and the working pressure Up to 42MPa.

(9) Measurable media under complex working conditions: Due to its special structural design, it has special performance. It can measure various mixed gases, gas-liquid two-phase media (such as moisture), Slurry, multiphase flow, vibrating flow, electromagnetic interference media and bidirectional flow.

(10) More safe and reliable: The entire instrument is welded with international advanced automated welding equipment, and non-destructive testing technology is used for butt welding.The connecting parts are tested, and the instrument operation is safer and more reliable under special working conditions.

2. Working Principle

The working principle of the balance flow meter is the same as that of other differential pressure flow meters, both are based on Bernoulli's equation, comply with the national standard GB/2624, and have sealed pipes The energy conversion principle in: In the case of ideal fluid, the energy in the pipeline is proportional to the square root of the differential pressure; the measured differential pressure value can be used to calculate the flow rate in the pipeline according to Bernoulli's equation.

Balance flow meters are suitable for almost all fluid measurements and are a revolution in fluid measurement technology. They have been widely used in petroleum, chemical industry, metallurgy, electric power, natural gas, water treatment and other industries.