由于其特殊的结构设计，使其具有特殊的性能，它可以进行气液两相，各种混合气体（如瓦斯、沼气、煤气等等）、各种低温气体（如LNG、液氮、液氧、液氩、液氢、液氯、液化乙烯、液化石油气等等）、气液两相介质（如湿气）、浆料、多相水流、震动水流、电磁干扰介质和双向流（因为平衡流量计左右完全对称）。 Due to its special structure design, the balance flow meter has special performance. It can perform gas-liquid two-phase, various mixed gases (such as gas, biogas, coal gas, etc.), and various low-temperature gases (such as LNG, liquid nitrogen). , Liquid oxygen, liquid argon, liquid hydrogen, liquid chlorine, liquefied ethylene, liquefied petroleum gas, etc.), gas-liquid two-phase media (such as moisture), slurry, multiphase water flow, vibrating water flow, electromagnetic interference media and two-way flow (Because the balanced flow meter is completely symmetrical from left to right).
The balance flow meter is a third-generation throttling device. It is a new type of flow meter designed and invented by the NASA-Marshall Aviation Flight Center (NASA-MSFC) for the measurement of liquid oxygen in the main engine of the space shuttle. Is a balanced flow meter. The measurement accuracy of this flow meter is 5 to 10 times that of traditional throttling devices, the flow noise is reduced to 1/15, the permanent pressure loss is about 1/3, and the pressure recovery is 2 times faster. The minimum straight pipe section can be less than 0.5D. The movable parts are very convenient and simple to install and use, which can save large straight pipe sections and greatly reduce the energy consumption required for fluid operation. It is an energy-saving instrument with broad application prospects.
The balanced flow meter has greatly improved the traditional throttling device, and changed the principle of throttling from edge throttling to balanced throttling. It is a revolutionary differential pressure flow meter. The balanced flow sensor is a porous disc throttle rectifier, which is installed on the cross section of the pipeline. The size and distribution of each hole are customized based on unique formulas and test data, called function holes. When the fluid passes through the function holes of the disc, the fluid will be balanced and adjusted, and the vortex will be minimized to form an approximately ideal fluid. Through the conventional pressure taking device, a stable differential pressure signal can be obtained, and the volume flow rate is calculated according to Bernoulli's equation. ,Mass Flow. The ingenious design of the balanced flow meter is to combine the porous rectifier and the measurement orifice plate into one, which can adjust the flow field balance to the ideal state to the maximum extent, so as to exert the advantages of the differential pressure flow meter to the extreme. Supported by huge space research funding, from 2000 to 2004, NASA and QMC have organized a large number of flow technical experts, invested 10 million US dollars, conducted a large number of tests on balanced flow meters, and about 100,000 sets of flow measurement data reflected the test. The results are good and the product performance is comforting. The balanced flow meter is suitable for almost all fluid measurement. It is a revolution in fluid measurement technology. Its processing, manufacturing and installation can be standardized like orifice plates. Verification is also easy to achieve dry standard. It is expected to become a new international standard for throttling devices. NASA has won a series of patents for product inventions in 2004 and the invention award from the President in 2006. The traditional throttling device has only one flow aperture, and the fluid loses its ideal state after throttling. The balanced flowmeter has multiple function apertures, which can balance the flow field into an ideal fluid to the maximum extent, thereby reducing the pressure of the differential pressure flowmeter. Give full play to the advantages. The balanced flow meter is suitable for almost all fluid measurement. It is a revolution in fluid measurement technology. At present, the balanced flow meter has been widely used in petroleum, chemical, metallurgy, power, natural gas, water treatment and other industries.
是一种革命性的差压式流量仪表，其工作原理与其他差压式流量计一样，都是基于密封管道中的能量转换原理：在理想流体的情况下管道中的流量与差压的平方根成正比；用测出差压值根据伯努利方程即可计算出管道中的流量。 Product Principle Balanced flow meter is a revolutionary differential pressure flow meter. Its working principle is the same as other differential pressure flow meters. It is based on the principle of energy conversion in a sealed pipeline: the flow in the pipeline under the condition of an ideal fluid. It is proportional to the square root of the differential pressure; the flow in the pipeline can be calculated by measuring the differential pressure according to Bernoulli's equation. The balanced flow sensor is a porous disc throttle rectifier, which is installed on the cross section of the pipeline. The size and distribution of each hole are customized based on special formulas and test data, called function holes. When the fluid passes through the function holes of the disc, the fluid will be balanced and rectified, and the vortex will be minimized to form an approximately ideal fluid. A stable differential pressure signal can be obtained through the pressure taking device. Mass Flow.
Characteristics of balanced flowmeter
1. Measurement accuracy is 5-10 times that of standard orifice plate 2. Flow noise is 1/15 of standard orifice plate 3. Permanent pressure loss is 1/3 of standard orifice plate 4. Pressure recovery is 2 times faster than standard orifice plate 5 The minimum straight pipe section can be less than 0.5D
First, high linearity and good repeatability
The balanced flow sensor has the characteristics of symmetrical porous structure, which can balance the flow field, reduce eddy current, vibration and signal noise, greatly improve the stability of the flow field, make the linearity 5 to 10 times higher than the orifice plate, and improve the repeatability 54 % Is 0.15%. From its comprehensive performance, balanced flowmeters belong to the ranks of high-end flowmeters.
5: 1 range ratio, linearity can reach ± 0.3%;
7: 1 range ratio, linearity can reach ± 0.5%;
10: 1 range ratio, linearity can reach ± 1.0%
传感器由于流场稳定，且压力恢复比孔板快两倍，大大所短了对直管段的要求其前后直管段一般为前3D后1D，最小可以小于0.5D，从而省去大量直管段，尤其是特殊昂贵的材料的管道。 Second, the straight pipe section requires low, balanced flowmeter sensor because the flow field is stable, and the pressure recovery is twice as fast as the orifice plate, which is greatly shortened. D, thereby eliminating a large number of straight pipe sections, especially pipes of special expensive materials. Third, reduce the permanent pressure loss, the balanced design of porous symmetry, reduce the turbulent shear force and vortex formation, reduce the loss of kinetic energy, under the same measurement conditions, compared with the orifice plate 2.5 times less permanent Pressure loss, which saves considerable operating energy costs, is an energy-saving instrument that deserves a lot of promotion. Fourth, the anti-fouling and easy-to-block balanced symmetrical design reduces the formation of turbulent shear forces and vortices, thereby greatly reducing the formation of stagnant dead zones, ensuring that dirty media can smoothly pass through multiple holes, and reducing fluid flow. Chance of holes being blocked. V. Orifice plate can be directly replaced. It has the same use method and appearance as the orifice plate, so it can be replaced directly. It does not require any changes in piping and related instruments. It is very suitable for changing the orifice plate in the whole plant energy measurement transformation. Is a balanced flow meter. 6. The flow measurement range is wide. According to the test results, we know that: the performance of the flowmeter is balanced so that the flow rate can be from the minimum to the speed of sound; the minimum Reynolds number can be less than 200, the maximum Reynolds number is greater than 107; ~ 0.90. Seven, long-term stability is good, because its turbulent shear force is significantly reduced, greatly reducing the direct friction between the medium and the throttle, its β value remains unchanged for a long time, the entire instrument has no moving parts, so it can be long-term Maintain stability. 8. It can measure high-temperature and high-pressure media. As with orifices and other throttling devices, the working temperature and pressure depend on the materials and grades of pipes and flanges. The working temperature can reach 850 ° C and the working pressure can reach 42MPa. Nine, can measure the complex working medium, because of its special structure design, it has special properties, it can perform gas-liquid two-phase, various mixed gases (such as gas, biogas, coal gas, etc.), various low-temperature gases (Such as LNG, liquid nitrogen, liquid oxygen, liquid argon, liquid hydrogen, liquid chlorine, liquefied ethylene, liquefied petroleum gas, etc.), gas-liquid two-phase media (such as moisture), slurry, multiphase water flow, vibration water flow, Electromagnetic interference medium and bidirectional flow (because the balanced flow meter is completely symmetrical from left to right).
Pipe diameter range: DN15 ~ DN3000
Accuracy: ± 0.3%, ± 0.5%, ± 1%
Straight pipe requirements: 0.5D ~ 2D
Permanent pressure loss: 1/3 ~ 1/4 of orifice plate
Range ratio: 10: 1, suitable working conditions data can be wider.
Re range: 200 ~ 107
β range: 0.25 ~ 0.9
Temperature range: The temperature that the metal pipeline can withstand, up to 850 ° C.
Pressure range: the pressure that the metal pipeline can withstand, up to 42MPa.
Dirt resistance: special design and calculation
Can measure bidirectional flow