The throttle device product recommendation - Annubar flowmeter
1.overview
Annubar flowmeter, belongs to the differential pressure type flowmeter. Is the high-low voltage differential pressure measuring principle of measuring fluid dynamic pressure and the downstream pressure difference between the static pressure of formation, so as to achieve the goal of measuring flow rate. Measurement between DN30mm to DN12000mm pipe diameter. Annubar flowmeter is mainly used for all kinds of energy in the process of industrial fuel such as liquid, gas, steam and gas measurement, has the high stability and repeatability. Annubar flowmeter design principle conforms to the principle of Bernoulli equation, through the European Union CE quality certification, design patents registered through automation.
2. The purposes and characteristics
Annubar flowmete with its easy installation, small pressure loss, high strength, is not affected by wear and tear, and the advantages of no leak and become ideal replace orifice plate products. Annubar flowmete can be widely used in industrial and mining enterprises of blast furnace gas, compressed air, steam, gas and other fluid flow measurement.
(1)The unique internal structure of quadratic mean, provides the high accuracy (+ / - 1%) reading repeatability (plus or minus 0.1%).
(2)The outer shock tube USES a single piece of material processing and without welding points, and by the catamaran structure welded together naturally has a higher strength than similar products, and use high temperature resistant, corrosion resistant material, has better protective performance.
A.stable hexagonal honeycomb structure, is produced by the unique shape of the distribution of a beam to ensure the stability of the low voltage signal, the differential pressure is higher than similar products, improve the range ratio.
B.is suitable for square or rectangular pipe.
C.measurement smudgy medium for the similar products in the inevitable congestion, there are online can be pulled up or provide manual and automatic purging methods and devices, not achieve production maintenance.
D.velocity-equalizing tube + 3 + + transmitter temperature pressure compensation valve group, composed of integrated structure, easy to use.
E.no flow coefficient, the long-term stability.
F.exclusive provide direct observation resonance check, ensure the long-term stable operation.
Small pressure loss of the g low energy consumption, energy saving effect is remarkable
Annubar flowmeter output for the differential signal, the flowmeter and measurement of differential pressure instruments, can accurately measure, pipe, rectangular pipe in a variety of liquids, gases and steam (superheated steam and saturated steam). The size of the pipeline under test range from 20 mm - 3000 mm. Annubar flowmeter in the power industry (including nuclear industry) chemical industry, petroleum chemical and metal smelting industry departments such as the bank of China to the use of success, it is suitable for:
①, the gas and liquid transportation
②, energy research, steam boiler heat rate, efficiency of pump, the gas compressor efficiency and fuel consumption
③, process control, input and output, ratio and balance; Cooling water or air, steam heating.
3. parameters
ⅰ, specifications: (- DN5000 (mm); Insert: DN500 - DN5000 (mm);
ⅱ, the measurement accuracy: + / - 0.5%, plus or minus 0.2%; Repeatability: + / - 0.1%;
ⅲ, scope: volume flow: 10:1; 100; 1. The mass flow rate: 8;
ⅳ, work stress: velocity-equalizing tube without functional: 29.00 MPa or less; Velocity-equalizing tube can be put forward: 10 mpa or less;
ⅴ, fluid temperature: 450 ℃ or less;
ⅵ, medium viscosity: 30 or less cp (crude oil);
Annubar flowmeter need parameters:
Ⅰ, the measured medium: all kinds of gas, liquid and steam flow measurement of the medium
Ⅱ, the temperature of the measured medium: 60 ℃ ~ 850 ℃
Ⅲ, by measuring the pressure of medium: 1.0 ~ 42 mpa
Ⅳ, be measured medium flow: calculate according to the medium
Ⅴ, by measuring the viscosity of the medium: calculate according to the medium
The main advantage of Annubar flowmeter
Annubar flowmeter (also called flute velocity-equalizing tube flow meter) is developed according to the principle of pitot tube speed of a new type of differential pressure flow rate measurement. I plant the production of Annubar flowmeter its novel design, reasonable structure, high precision, small pressure loss, easy installation and use, with its special advantages in many occasions gradually replace orifice and other test components, products have passed the provincial appraisal. Annubar flowmeter output for the differential signal, the flowmeter and measurement of differential pressure instruments, can accurately measure the circular pipe, rectangular pipe in a variety of liquids, gases and steam (superheated steam and saturated steam). Pipeline being measured range in size from phi 20 mm to 3000 mm. Annubar flowmeter in the power industry (including nuclear industry) chemical industry, petroleum chemical and metal smelting industry departments in the use of success, it is suitable for:
❶Gas and liquid transportation
❷Energy research, steam boiler thermal efficiency, pump efficiency, gas compressor efficiency and fuel consumption;
❸Process control: input and output, ratio/balance; The cooling water or air. Steam heating
❹Material in chemical industry
❺Load balancing: pump, compressor, cooler, filter
❻Annubar flowmeter the advantages of flowmeter (compared with the orifice)
❼High accuracy, good stability
Annubar flowmeter for plus or minus 1% accuracy, stability for plus or minus 0.1%, it is able to maintain long-term very stable output differential pressure signal, to ensure that the output differential pressure signal and pipeline flow mapping relationship. This is because in the process of use wear, corrosion and adhesion of oil dirt on Annubar flowmeter coefficient of impact is not big, but these factors make the orifice discharge coefficient increases, and will rise to more than 20%, the error produced by this will reach more than 20%. We can find that Annubar flowmeter accuracy is long-term stability.
Reasonable design, easy installation, economy
Annubar flowmeter light weight, easy installation and disassembly, without lifting tool, the series of products are can be measured without a stop under the situation of the pipeline does not block the install or remove, because Annubar flowmeter of light weight, easy installation and disassembly, so this can save you considerable cost of installation. For example: in the 200 mm diameter pipe installed on the flowmeter, Annubar flowmeter is only a long 150 mm weld, and orifice has 2, a total of 1200 mm long long weld. In terms of working hours, to install a Annubar flowmeter only need 1.5 hours, while installing an orifice plate to 12 hours
For pipeline layout
Annubar flowmeter is suitable for round pipe not only, also applies to any depth rectangular pipeline and buried under the ground. Annubar flowmeter the length of the straight pipe upstream and downstream demand was much lower than the orifice plate, when the installation is behind the elbow distance 2 times the pipe diameter, still can get a stable, high accuracy, it is Annubar flowmeter's unique advantages, to pipe especially large diameter pipeline layout design brings a lot of flexibility, save the cost
Small pressure loss, energy loss permanent pressure loss is less power loss, Annubar flowmeter permanent pressure loss accounts for only 2 to 15% of the differential pressure, and general orifice of permanent losses of differential pressure of 40 ~ 80%, can be seen from the chart of Annubar pressure loss of the permanent pressure loss is much smaller than orifice plate, with the increase of pipe diameter, Annubar permanent pressure loss can be neglected. For example: use on the 1000 mm diameter pipe Annubar flowmeter, the energy loss of only a few hundred yuan a year, when using orifice plate, energy losses as high as 20000 yuan a year, it is for today to try to save energy have opinions.
(1) install and use, when the line, the downstream straight pipe is not long enough, recommended after bending force and 2 pipe diameters. Because of complicated fluid profile of after the bend, the fluid must be do slight adjustment coefficient K, according to relevant data show that after the adjustment coefficient K, measuring precision from + 1% to + 3%, repeat accuracy from + 0.1% to + 0.3%.
(2) the power of continuous work, fundamentally eliminate the possibility of the wall, but in the following cases, power, still need to pay attention to prevent:
When the pressure pipe leaking, probe high destroyed, impurities in the smaller diameter particles could enter take pressure hole;
When pipeline in production, due to molecular Brownian movement, small particles of impurities likely to take pressure hole;
Frequent system boot, formed in the high moment, small particles of impurities may enter the hole, accumulate over a long period, it is possible to probe the jam;
Medium contains a large amount of tar, biological species, or containing fibrous material, may also cause the probe blockage.
4.debugging
Signal lines, the power cord
Open import, and export valves, import and export valve opening
Balancing valve open three stainless steel valve group, slowly open the orifice to the high and low pressure valves, stay fluid through the flowmeter balancing valve can be closed after three stainless steel valve group.
Pipeline installation conditions:
(1) straight pipe before and after the throttle articles must be straight, bend shall not be visible to the naked eye.
(2) install throttle with straight pipe should be smooth, if not smooth, flow coefficient should be multiplied by the roughness correction sparse.
(3) in order to ensure the flow of the fluid in the formation of throttling a 1 d before the full development of the turbulent velocity distribution, and makes the distribution into uniform axisymmetric shape, so
1) straight pipe must be round and throttling range 2 d before, its roundness, its very strict and have certain roundness index. Specific measures:
OD before throttling (A) A, D / 2 D, 2 d4 on the vertical pipe section, by A large distance at least equal to the Angle of the measured four pipe diameter single measurements, the average D. Any diameter single measured value and the difference between the average shall not exceed + / - 0.3%
(B) after the throttle piece, the OD and 2 D location using the above method obtained eight diameter single measurement value of arbitrary single measurement values compared with D, the maximum deviation shall not be more than + / - 2%
2) throttling requires a enough long straight pipe before and after a long enough straight pipe and throttle and diameter on the local resistance of a form before than beta. Throttling pieces of upstream side first resistance and the resistance between the straight pipe length according to the form of a second resistance and beta = 0.7 (no matter what is the actual beta) take half of the values listed. The throttle upstream side for open space or a diameter of 2 d large container, or open space or a large container with throttling a long straight tube shall not be less than 30 d (15d). If throttling and open space or there are other local resistance between large container, except in throttling and local resistance parts with adhesion between specified limit straight long 1, from the open space to the throttling parts between the straight pipe section chief, also should not be less than 30 d (15d).
5. the application range
Flow meter and its widely used, the application of flow measurement technology and instrument to roughly the following several areas.
Ⅰ, industrial production process
Flow meter is one of the categories of instruments for process automation instrument and apparatus, it is widely used in metallurgy, electric power, coal, chemical industry, petroleum, transportation, construction, textile, food, medicine, agriculture, environmental protection and People's Daily life and so on each domain of national economy, is the development of industrial and agricultural production, save energy and improve the quality of our products and improve the economic advantage and the management level of the important tools in the national economy occupies an important position. In process automation instrument and apparatus, flow instrument has two functions: as a process automation control system of the testing instrument and measuring the amount of material quantity table.
Ⅱ, energy metering
Energy can be divided into primary energy (coal, oil, coal bed methane, liquefied petroleum gas (LPG), and natural gas), secondary energy (electricity, coke, artificial gas, refined oil, liquefied petroleum gas, steam) and can load working medium (compressed air, oxygen, nitrogen, H2, water), etc. Energy metering is energy, scientific management to realize saving energy and reducing consumption, and an important means to improve the economic advantage. Flow meter is an important part of energy meters, water, artificial gas, natural gas, steam and oil these commonly used energy using a very large number of flow meter, which is an indispensable tool in energy management and economic accounting.
Ⅲ, environmental protection engineering
Flue gas, liquid and solid sewage emissions serious air pollution and water resources, such as a serious threat to human survival environment. National sustainable development as national policy, environmental protection will be the biggest issue in the 21st century. Air and water pollution should be controlled, it is necessary to strengthen management, and management is the basis of quantitative control of the pollution.
Our country is based on coal as main energy country, there are millions of chimneys discharge smoke into the atmosphere. Flue gas emission control is an important project of radical pollution, each stack must be install flue gas analysis instrument and meter, even Du emissions monitoring system. Flue gas flow quantity of kang hang it is very difficult, it's difficult to funnel large in size and shape is irregular, the uncertainty of the gas composition, velocity range is big, dirt, dust, corrosion, high temperature, no straight pipe and so on.
Ⅳ, transportation
There are five ways: railway highway, aviation, water transport and pipeline transport. Application of pipeline transport is has already been done, but is not common. With environmental problems
The outstanding, the characteristics of the pipeline transport has caught people's attention. Pipeline transport must be equipped with flow meter, it is the eye of the control, distribution, and scheduling, also is an essential tool for security supervisor and economic accounting.
Ⅴ, biological technology
The 21st century will usher in the century of life science, is characterized by biotechnology industry will also get rapid development. A lot of material need to monitoring and measurement in biological technology, such as blood, urine, etc. The difficulty of the instrument development is great, wide variety.
Ⅵ and scientific experiments
Scientific experiments need not only quantity of flowmeter, and variety is extremely complex. According to the statistics of flowmeter was in large part should be in more than 100 scientific research need, they are not batch production, sale in the market, many research institutions and large enterprises are set panel flowmeter in the development of the special.
Ⅶ, Marine meteorology, rivers and lakes
These areas for open port, generally need to detect the velocity, and then calculate flow. Flow meter and flow meter is based on the physical principle and the basis of fluid mechanics is a common but instrument principle and structure and using conditions vary greatly.
6.working principle
Annubar flowmeter principle introduction
When the fluid flows through the sensor, a high pressure generated in the front of its distribution area, hydrostatic pressure slightly higher than the area of high pressure pipe. According to the principle of Bernoulli equation, to speed up the speed when the fluid flows through the probe, the probe at the back of the produce a low pressure area, the pressure is slightly lower than area of low pressure pipe of the static pressure. Fluid from the probe through the vacuum on the probe at the back of the part, and appear on both sides of the probe vortex. Average flow cross section shape of probe, the condition of surface roughness and low pressure hole location is the key to probe performance factors. Low voltage signal is stable and accurate, is crucial to average probe of precision and performance. The average power flow probe can be detected accurately by the fluid produced by the average speed of the average differential pressure. The average power flow probe in the rule of high and low pressure area is in a certain arrangement to take more pressure hole, made it possible to accurately measure the average velocity.
Annubar flowmeter is based on the pitot tube principle of speed, it is through the pipeline of average flow velocity and pipe flow of product to determine the effective cross-sectional area. Average velocity distribution of pipe is not uniform. If it is a fully developed flow, the velocity distribution for the index law. Circular cross section in order to accurate measurement, the entire faceted and multiple unit area is equal to half more than half a ring. Sensor detection rod is composed of a hollow metal tube, flow surface of total pressure more holes, respectively in each unit area of the center of the reaction, respectively, the flow velocity of each unit area. Due to the total pressure hole is mutually, to each point in the detection lever average total pressure value, the total pressure out pipe leads to high pressure joint, the normal pressure chamber to the sensor. When the sensor is installed correctly on the process piping of straight section of long enough, traffic on the cross section should be no vortex, the whole cross section of the static pressure is constant, can be thought of in the back of the sensor or side is equipped with inspection hole, on behalf of the entire cross section of the static pressure. By the static pressure out pipe joint by low pressure leads to the negative pressure chamber of the transducer. The square of the positive and negative pressure chamber pressure differential is proportional to the flow of section average flow velocity, the cluster for differential pressure and flow rate is proportional to the relationship. On the relationship between the, can by the Bernoulli equation and continuity equation was derived velocity-equalizing tube flowmeter flow calculation formula of the Qv=α﹒ε﹒(π/4)﹒D2﹒(2?P/ρ1)0.5 Qm=α﹒ε﹒(π/4)﹒D2﹒(2?P﹒ρ1)0.5.