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Balanced orifice flowmeter
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Balanced flow meter, also known as perforated orifice flow meter, is a differential pressure type flow meter, which improves on the traditional throttling device, and the flowmeter has outstanding features such as balanced rectification. The traditional throttling device has only one flow aperture. After the flow, the fluid loses its ideal state. Its working principle is the same as other differential pressure flow meters. It is based on the principle of energy conversion in the sealed pipeline: in the case of an ideal fluid, the flow rate in the pipeline is proportional to the square root of the differential pressure; The flow rate in the pipeline can be calculated according to the Bernoulli equation by using the measured differential pressure value. The balanced flow sensor is a porous disc throttling rectifier, which is installed on the cross section of the pipe. The size and distribution of each hole is customized based on the formula and test data, which is called a function hole. When the fluid passes through the function hole of the disc, the fluid will be balanced and rectified, reducing the vortex, and forming an approximate ideal fluid. Through the pressure taking device, a stable differential pressure signal can be obtained. The volume flow rate, Mass Flow.
1. High measurement accuracy
Because the balanced flow sensor has the characteristics of porous structure, it can balance the flow field, reduce eddy current, vibration and signal noise, and improve the stability of the flow field. The meter body adopts a special precision pipe and a special pressure device, which makes the accuracy more than traditional The throttling device is improved by 5-10 times.
After real flow calibration, the sensor accuracy can reach ±0.5%, which is suitable for trade measurement occasions.
Geometric size inspection, the sensor accuracy can reach ±1.0%, suitable for process control occasions.
Balanced flowmeter has high processing repeatability. Like the traditional throttling device, geometric dimension verification can be achieved on the basis of real flow calibration data.
2. Low requirements for straight pipe sections
The balance flow sensor can balance the flow field, adjust and stabilize, and the pressure recovery is twice as fast as the traditional throttling device, which shortens the requirements for straight pipe sections. In most cases, the straight pipe section can be as small as 0.5D~2D, especially for special or expensive pipelines, a large number of straight pipe sections can be saved by using a balanced flowmeter.
3. Low pressure loss
The symmetrical balance design of the balanced flowmeter reduces the formation of vortex and turbulent friction, and reduces the loss of kinetic energy. Under the same working conditions, compared with the traditional throttling device, the pressure loss is 70% less, which is close to the venturi tube. , Thus saving operating costs, it is worthy of promotion.
4. Wide range ratio
Compared with the traditional throttling device, the balanced flowmeter improves the measurement range ratio. The research results show that when the Reynolds number is greater than 50,000, select the appropriate aperture parameter. According to the needs of industrial measurement applications, the conventional measurement range ratio is 10:1. Choosing the right parameters can be done at 30:1.
5. Good repeatability and long-term stability
Balanced flow sensor can balance and stabilize the flow field and improve repeatability to ±0.1%.
Balanced flowmeter has multiple flow holes with distributed force, no sharp angle wear, its β value remains unchanged for a long time, and long-term stability is very good; the entire meter has no moving parts, and its service life is 5-10 times longer than that of traditional throttling devices.
6. Dirt resistant and not suitable for blocking
Porous and symmetrical balanced design reduces the formation of turbulent shear force and vortex, thereby reducing the formation of dead zones, ensuring the smooth passage of dirty media through multiple holes, and reducing the chance of fluid holes being blocked.
7. Wide measuring range
According to the experimental results, we know that: balance the performance of the flowmeter so that its flow rate can be from low to sonic speed, its small Reynolds number can be less than 200, and the large Reynolds number is greater than 107; β value can be selected from 0.25 to 0.9.
8. Scope of application
The working temperature of the balanced flowmeter, the pressure depends on the material and grade of the pipe and flange, the working temperature can reach 850℃, 42MPa.
It is suitable for extremely low temperature fluid LNG, liquid air, liquid nitrogen, liquid oxygen, liquid argon, liquefied ethylene, liquid hydrogen, liquid chlorine, etc. It can effectively prevent gasification and has a good measurement effect.
Balanced flowmeter can measure vapor-liquid two-phase, slurry measurement, and can also measure bidirectional flow.
Balanced flowmeter is symmetrical, so it can measure two-way flow conveniently.
Pipe diameter range: DN50~DN2000
Accuracy: ±0.5%, ±1%;
Straight pipe section requirements: 3D~1D;
Pressure loss: 1/3~1/4 of orifice plate;
Turndown ratio: 10:1, suitable working condition data can expand the turndown ratio;
Re range: 200~107;
β range: 0.25~0.9;
Temperature range: the temperature that metal pipes can withstand, up to 850℃;
Pressure range: the pressure that the metal pipe can withstand, up to 42MPa;
stain resistance: special design and calculation;
can measure bidirectional flow.
can be applied to gas, liquid, gas-liquid two-phase, liquid gas, two-way flow, dirty medium, slurry measurement.
Application of Balanced Flowmeter
Balanced flow meters have special applications in industrial production. In the past, throttling devices were commonly used. However, due to some defects in throttling devices to some extent, such as: low accuracy, such as the requirements in the production process, calculations Ways, etc., so nowadays, there are more flowmeters commonly used in industrial production. This is just an improvement on the traditional throttling device with a balanced flow meter. It does not mean that the throttling device can be completely replaced by a balanced flow meter. The improved and upgraded products have features such as balanced rectification, because the throttling device has only one flow aperture. , After throttling, the fluid loses its ideal state; and the balance flowmeter has multiple functional apertures, which rectify the flow field balance into an ideal fluid, thus fully exerting the advantages of the differential pressure flowmeter. This is also an improvement in the industry. The orifice plate was invented and created by Britain. It has been in China for many years. But it also plays a certain role in the development of China. Nowadays, the commonly used balance flowmeter is suitable for fluid measurement in the industrial field. At present, the balance flowmeter has been widely used in automation engineering, control field, petroleum and petrochemical, metallurgical smelting, and thermal power generation. , Natural gas, water treatment and other industries.
The principle of balanced flowmeter
Balanced flowmeter is a kind of differential pressure flow meter, but it has been improved in terms of product performance and technology. The same reasoning has its own advantages and disadvantages, but its working principle is the same as other differential pressure flowmeters. It is also based on the principle of energy conversion in sealed pipelines: in the case of an ideal fluid, the flow rate 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 the Bernoulli equation. The balanced flow sensor is a porous disc throttling rectifier, which is installed on the cross section of the pipe. The size and distribution of each hole is customized based on a special formula and test data, which is called a function hole. When the fluid passes through the function hole of the disc, the fluid will be balanced and rectified, reducing the vortex, and forming an approximate ideal fluid. Through the pressure taking device, a stable differential pressure signal can be obtained. The volume flow rate, Mass flow, now with some special requirements in the industrial automation process, people's requirements in production and life are also changing, so the balance flowmeter and throttling device will also exist in the application site.
Balanced flowmeter and orifice plate comparison
Balanced flowmeter is suitable for fluid measurement. At present, balanced flowmeter has been widely used in petroleum, chemical industry, metallurgy, electric power, natural gas, water treatment and other industries. Balanced flowmeter is a new type of flowmeter newly developed in recent years. Based on the standard orifice plate, the method of porous circulation is adopted to avoid the disadvantages of large pressure loss in the field use of the standard orifice plate and the need for long front and rear straight pipe sections. The measurement accuracy has also been improved compared to the standard orifice plate.The following will give you a detailed introduction to the advantages of the balanced flowmeter industrial measurement.
When the standard orifice flowmeter is used in the field, the pressure loss is large, and the high requirements for the front and rear straight pipe sections are the main reasons that limit its development. About 1/4 of the plate, the straight pipe section requires only about 1D before 3D. It is often 1:3, and the field measurement range often exceeds this range. This also limits the application of standard orifice plates in many cases. The normal ratio of the range of the balanced orifice flowmeter is about 20:1. In some cases, the upper flow rate can be increased. The small Reynolds number can be lower than 200, and the large Reynolds number is greater than 10 7; the β value can be selected from 0.25 to 0.90.
The on-site measurement of the balanced flowmeter adopts a symmetrical porous structure, which can actually balance the fluid and reduce eddy current and vibration. Compared with the on-site measurement of the orifice flowmeter, these advantages are improved a lot. At the same time, the measurement range is wide, and the differential pressure is solved. The defect of the type flow meter is an upgrade of the standard orifice plate.
The balance flowmeter has good long-term stability. Due to its obvious reduction of turbulent shear force, the direct friction between the medium and the throttle is greatly reduced, and its β value remains unchanged for a long time. The entire meter has no moving parts, so it can Long-term stability. Secondly, it also has the measurement advantages of standard orifice plates, which is suitable for high temperature and high pressure measurement occasions, and is basically suitable for on-site medium measurement.
Balanced orifice flowmeter
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