Abstract: the working principle of the intelligent vortex precession flowmeter scale and installation requirements information produced by excellent flow meter, flow meter manufacturer to offer you the quotation.

Intelligent vortex precession flowmeter principle: when along the axial flow of the fluid at the entrance into the flow sensor, the blade force fluid into the rotary motion, thus vortex occurred in the vortex flow, vortex flow rotation in the venturi tube, to shrink.

More flow meter manufacturers choose model price quote you are welcome to inquire, here is the working principle of the intelligent vortex precession flowmeter scale article details and installation requirements.

Intelligent vortex precession flowmeter principle: when along the axial flow of the fluid at the entrance into the flow sensor, the blade force fluid into the rotary motion, thus vortex occurred in the vortex flow, vortex flow rotation in the venturi tube, reached the contraction section of throttling the vortex flow speed up suddenly, after the vortex flow into the diffuser, due to the effect of reflow forced precession type quadratic rotation, the rotation frequency of vortex flow is proportional to the medium flow rate, and linear.

Piezoelectric sensors to detect the weak signal charge after preamplifier amplification, filtering, plastic into frequency is proportional to the velocity of the pulse signal, zui to count to send totalizer. especially after processing.

Intelligent vortex precession flowmeter installation requirements: in use process, intelligent vortex precession flowmeter requirement for straight pipe before and after.

If the measured gas contains larger particles or long fibers sundries, need to install the filter.

Have a certain request for air flow and the flowmeter, the gas being measured for single phase, continuously flowing through a pipe, pipe flow;

Before the gas flowing through the meter, the flow rate must be parallel to the pipe axis, can not have vortex flow;

Airflow should be subsonic, a pulse, its flow changes over time is slow, but to be on the safe side, zui to meter the front-end pressure regulating valve installation, to ensure the flow smooth, stable.

For ease of maintenance, do not affect fluid by flowmeter calibration and maintenance of normal delivery, requires the installation of the flowmeter by-pass pipe should be set up, and should ensure the flow downstream zui, short straight pipe;

Flowmeter in addition to the common horizontal installation, can adopt vertical installed, when mounted horizontally, but instead must ensure that the flow of fluid from the top.

Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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Abstract: this paper introduces the application of electromagnetic flow meter information produced by excellent flow meter, flow meter manufacturer to offer you the quotation.
The electromagnetic flowmeter applied widely.

According to the application of large diameter, small diameter, small diameter and small diameter.

Among them, the large diameter electromagnetic flowmeter is mainly used for water supply and drainage engineering, and medium and small diameter electromagnetic flowmeter is often used for solid liquid two phase, difficult to measure the fluid or requirements.

More flow meter manufacturers choose model price quote you are welcome to inquire, here is introduced the application of electromagnetic flowmeter article details.

The electromagnetic flowmeter applied widely.

According to the application of large diameter, small diameter, small diameter and small diameter.

Among them, the large diameter electromagnetic flowmeter is mainly used for water supply and drainage engineering, and medium and small diameter electromagnetic flowmeter is often used for solid liquid two phase, difficult to measure the fluid or demanding situations, such as papermaking industry to measure the pulp and black liquor, non-ferrous metallurgical industry measuring pulp, coal preparation plant, coal slurry highly corrosive liquid, chemical industry, steel industry blast furnace tuyere cooling water control, long-distance pipeline flow measurement and control of hydraulic transportation of coal, etc.

And small diameter and a small diameter is commonly used to have health requirements, such as pharmaceutical industry, food industry and bioengineering.

Electromagnetic flowmeter of the hybrid material in the liquid with bubble flow the tiny air bubbles can still work normally, but measured mixing volume flow containing bubble volume;

If gas content increases, the formation of a slug flow, the circuit will be disconnected immediately, because the electrode may be covered by gas, the output will be shaking, and even can't work normally.

Drilling mud, drilling mud and water, for example, the pulp is actually Newtonian fluid.

Because of the solids in the fluid of the load flow together, containing the ferromagnetic particles or fiber solid-liquid two-phase fluid can also measure the volume of the two phase flow.
High solid content of fluid.
They have a gap between, speed, there are differences.

Single-phase liquid calibration instrument used in solid-liquid two-phase fluid will generate additional error.

Experimental lecture although there is no system to discuss the electromotive force of the influence of solid matter in solid-liquid two-phase fluid, but there are reports that abroad when solid matter content is 14%, the error is within 3%.

According to the experiment of institute of science of the Yellow River water resources commission water in China, when measuring high sediment concentration water flow, sediment concentration of volume measurement error is less than 3%, and the median diameter of 0.

35 mm in low-frequency rectangular incentive of electromotive force, there will be noise peak of slurry, paste the larger particles will wipe to the electrode surface.

To make the traffic signal is not stable, must choose the instrument or higher frequency noise suppression mud ability of the equipment, or ac excitation or double-frequency incentive instrument.
There will be a measurement error.

However, by the electromotive force of magnetic circuit of the magnetic flux detecting coil compensation can reduce the influence of ferromagnet.

Shanghai guanghua instrument factory said in a speech in ac excitation device of the experiment, fe magnet is different of the measuring tube, fluid containing ferromagnetic material of common electromotive force will change too.

Water contains iron concentrate slurry, liquid-solid ratio of 41 weight, size & le;
0.
15 mm.

The contrast of clear water and pulp flow test, using 80 mm measuring tool usually display value of measuring tool change 7%, indicating the error in & plusmn;
Within 2% fs.

Pay attention to the degree of wear and tear sensor lining, and applied to pulp containing ore particles.

When measuring tube diameter increase, will generate additional error.

Here should be used to wear a good ceramic lining or polyurethane rubber lining.

At the same time, it is recommended that the sensor device installed in vertical pipe runs, make the pipe wear uniform, eliminate the local wear in the second half of the defect level devices.

Nozzle shape sheath can also be installed in the entrance end of the sensor, with relatively longer service life.

If attached the conductivity is higher than the liquid of conductive material, measurement is easy to be attached liquid, and the precipitation on the pipe wall.
Signal voltage will short out, unable to work.

If it is not conductive layer, should first pay attention to the electrode pollution, for example, is not easy to choose to tip or half spherical electrode, replaceable electrode, scraper scale cleaning electrode and so on.

Scraper can be on the outside of the sensor electrode regularly shave their scale by hand.

In foreign products, ultrasonic sensors are installed on the electrode surface to remove scale, but now very rare.

There are temporarily cut off of the measurement circuit and the electrode during the intermittent time of low voltage and high current flow, in order to burning and can remove the glue layer of the grease.

Where the easy adhesion, can increase the flow rate to achieve the purpose of the clean.
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Abstract: the scale vortex flowmeter by good reasons for error information flow meter, flow meter production factory to provide you with quotation.

Vortex street flowmeter measurement deviation main problems are as follows: 1: selection problems.

Some vortex sensor on diameter selection or due to changes in process conditions after the design selection, make choose a specification, the mouth of the actual selection should choose as small as possible.

More flow meter manufacturers choose model price quote you are welcome to inquire, here is a vortex flow meter scale error reason article details.

Vortex street flowmeter measurement deviation main problems are as follows: 1: selection problems.

Some vortex sensor on diameter selection or due to changes in process conditions after the design selection, made the choice big & ndash;

Specifications, the calibre of the actual selection should choose as small as possible, in order to improve the accuracy of measurement, the reasons are mainly related to question 1, 3, 6.

, for example, a vortex pipeline design for several devices to use, because the process part sometimes does not use the equipment, the current actual use flow decreases, and the actual use of design model selection of the original diameter is too large, equivalent to improve the measurable lower limit flow rate, process piping little traffic instructions cannot be guaranteed, the large flow can also be used, because if you want to reinvent the difficulty is too big,

The change of process conditions is only temporary)
。

Can be combined with the parameters of setting to improve accuracy of instructions.
2: the installation issues.

Mainly sensor of the straight pipe length is insufficient, affect measurement accuracy, its reason mainly related to question 1.
Reason 3: parameters setting direction.

Parameter error makes the secondary instrument full frequency calculation error, its reason mainly related to question 1, 3.

Full frequency phase almost makes instructions are not allowed to be for a long time, the actual full frequency gets calculation of full frequency makes indicates wide fluctuations, readings, and data inconsistency and influenced the parameters of zui eventually determined, zui end parameters was determined by the calibration compared with each other again, to solve the problem.
4: secondary instrument malfunction.

This part of the fault is more, including: an instrument circuit board has break line, range set individual shows bad, K coefficient set individual shows bad, make uncertain range setting and K coefficient setting, this part mainly to the relevant problem 1, 2.

With the appropriate repair of fault, the problem is resolved.
5: four line road connection problems.

Part of the loop line connection is very good on the surface, and check carefully, some loose joint has actually led to the suspension of circuits, although some joint connection is tight but due to line problem tighten screw fastening on the line of leather, also makes the circuit interruption, this part is mainly related to question 2.

Solve the problem of the corresponding line, existing problem and corresponding solution.

6: secondary instrument and subsequent instrument connection problems.

Due to the subsequent instrument problems or as a result of the subsequent instrument maintenance, the secondary instrument of mA output circuit interruption, for this type of secondary instrument, this part mainly related to problem (2).

Especially for the subsequent recorder, in the case of recorder damaged beyond repair for a long time, it is important to note that the short after the output of the secondary instrument.

7: due to secondary instrument flat shaft cable fault loop always without instructions.

Because of long running, and is affected by the dust, causing shaft cable fault, clean or replace flat through wires, axis to solve problems.

8: for question 7 is mainly due to the secondary instrument display meter coil fixed screw loose, causing header sinking, Pointers and surface friction, action is ineffective, and fixed by adjusting the header, corresponding solution.
9: use the environment.

Especially the sensor installed in the well, in part due to environmental humidity is big, cause circuit board be affected with damp be affected with damp, this part is mainly related to question 2.

Through the appropriate technical renovation measures, the part of the environment of high humidity sensor to separate the sensor parts and transformation processing, separated type switch sensor, so the good working environment, has this part of the instrument as well.

10: because of bad field calibration or change due to the adjustment of the actual situation of then.

Or the adjustment after running for a period of time after the scene changes again, cause problems, this part mainly related to question 4, 5.

Using the oscilloscope, and combining process operation, readjust.

Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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The mass flow meter is used in the ammonia measurement of the synthetic ammonia branch plant. After the liquid ammonia is produced, under different pressure conditions, H2, N2, CH4, Ar and other gases will be dissolved. The liquid ammonia pressure drops to about 3.0MPa and enters the liquid ammonia storage tank. After the pressure drops, H2, N2, CH4, Ar and other gases are released from the liquid ammonia. At the same time, some ammonia vapor will also be generated due to changes in pressure and temperature. Therefore, before entering the liquid ammonia storage tank, there will be a gas-liquid two-phase mixed flow, and sometimes the gas will be higher than 30% (generally around 15% to 20%). When we have an in-depth understanding of the characteristics of the T-type flowmeter, we know that the gas of the flowmeter cannot exceed 5% when the gas-liquid phase is mixed. In order to meet the requirements of the meter, we added a relay tank before the liquid ammonia storage tank in the design of the metering scheme. The purpose of increasing the relay tank and automatically controlling the liquid level (LIC-101) and pressure (PIC-101) of the relay tank is to ensure that the liquid ammonia is separated from the gas and liquid in the relay tank, so that the liquid ammonia entering the meter The ammonia gas content is less than 5%, which meets the requirements of the flowmeter. The liquid ammonia from the bottom of the relay tank enters the liquid ammonia storage tank after being measured by FIQ-102. After metering, it is sent to the urea branch plant, and the ammonia used in the joint alkali branch plant comes out of the bottom of the small liquid ammonia storage tank, and is sent to the joint alkali branch plant after being measured by FIQ-101. This metering scheme enables liquid ammonia production and liquid ammonia consumption to be measured separately to meet the company's target cost assessment management for each branch factory. In construction, it is considered that the output of the mass flowmeter sensor is a resonant frequency signal. Therefore, during installation, special anti-vibration treatment is carried out for the straight pipes at both ends of the mass flowmeter. And it is required that liquid ammonia must come out from the bottom of the relay tank. The pipeline after the FIQ-102 metering and the liquid level regulating valve LV-101 must be raised to a certain height, the purpose is to open the mass flowmeter into a liquid seal, so that the liquid ammonia can reach the full pipe in the flowmeter, so that it can further reduce the pipeline Vibration, so as to ensure its measurement accuracy. Since the installation position of the flowmeter is in the encirclement of the cycle machine and large compressor, when the large motor starts, it will cause fluctuations in the grid voltage. In order to ensure that the resonant frequency of the T-tube of the flowmeter is stable at 80Hz and the amplitude is less than 1mm, it is necessary to ensure that the drive The voltage frequency of the coil is stable, for this reason, an AC voltage stabilizer is added in the installation of the instrument power supply.
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Article:

Ultrasonic Gas Flow Meters in LNG Industry: Accurate Measurement for Liquefaction

Introduction:

The liquefied natural gas (LNG) industry is a vital cornerstone of the global energy market. With the increasing demand for cleaner and more sustainable energy sources, the production and distribution of LNG have gained substantial momentum. In this context, accurate measurement of gas flow plays a crucial role. Ultrasonic gas flow meters have emerged as highly reliable and precise instruments, enabling accurate measurement in the LNG industry. This article delves into the significance of ultrasonic gas flow meters and their applications in ensuring accurate measurement for LNG liquefaction.



1. The Importance of Accurate Measurement in LNG Liquefaction Process

Liquefying natural gas is a complex process that requires precise measurement at multiple stages. From the gas extraction to liquefaction, accurate flow measurement ensures efficiency, safety, and optimal utilization of resources. Even minor discrepancies in measurement can lead to significant financial losses, safety risks, and environmental concerns. Ultrasonic gas flow meters have proved to be an exceptional solution in addressing these challenges.

2. How Ultrasonic Gas Flow Meters Work

Ultrasonic gas flow meters utilize sound waves to determine the velocity of gas flow within the pipeline. These meters consist of two transducers placed opposite each other, where one acts as a transmitter and the other as a receiver. The transit time difference between emitted and received signals is measured to determine the flow velocity. It is a non-intrusive method that doesn't interfere with the flow path or require direct contact with the gas.

3. Advantages of Ultrasonic Gas Flow Meters in LNG Applications

A. Non-Intrusive and Non-Obstructive: Ultrasonic gas flow meters do not obstruct the flow or introduce any pressure drop. They ensure uninterrupted flow while providing accurate measurements.

B. High Accuracy and Turndown Ratio: Ultrasonic meters excel in accuracy, even with varying gas composition and flow rates. Their wide operational range and high turndown ratio make them ideal for varying LNG production scenarios.

C. Minimal Maintenance and Low Operating Costs: These meters are known for their durability, reliability, and minimal maintenance requirements. They mitigate downtime and reduce operating costs in LNG plants.

D. Compatibility with LNG Operating Conditions: Ultrasonic meters are designed to withstand extreme temperatures, high pressures, and corrosive environments—conditions commonly encountered in LNG production and processing.

E. Real-Time Data and Integrated Communication: Ultrasonic gas flow meters offer real-time data transmission and can be seamlessly integrated into existing control systems, allowing for efficient monitoring, analysis, and optimization of LNG production.

4. Application of Ultrasonic Gas Flow Meters in Different Stages of LNG Liquefaction

A. Natural Gas Extraction: Ultrasonic gas flow meters play a crucial role in measuring the gas flow during extraction from natural gas fields. They ensure accurate data for resource allocation and financial calculations.

B. Gas Treatment and Purification: Before liquefaction, natural gas must be treated and purified. Ultrasonic flow meters enable precise measurement during this stage, ensuring optimal efficiency and quality of the LNG produced.

C. Liquefaction Process: Control and measurement of the feed gas during the liquefaction process are vital. Ultrasonic gas flow meters provide accurate and reliable data on gas flow rates, enabling efficient control and monitoring.

D. Storage and Transportation: The storage and transportation of LNG present unique measurement challenges. Ultrasonic meters are deployed at storage facilities and key transportation points to ensure accurate custody transfer, prevent losses, and maintain safety standards.

5. Industry Examples and Success Stories

Various LNG companies have implemented ultrasonic gas flow meters to enhance their operations. Company A, a leading LNG producer, reported a reduction in measurement discrepancies by 30% after adopting ultrasonic meters in their liquefaction process. This led to significant cost savings and improved overall efficiency. Similarly, Company B, a shipping company that transports LNG, integrated ultrasonic meters within their vessels to ensure accurate measurement during loading and unloading operations. This not only streamlined their operations but also enhanced safety and reduced the risk of overfilling or leakage.

Conclusion:

Accurate measurement is paramount for the successful operation of LNG facilities. Ultrasonic gas flow meters have emerged as a reliable solution, providing precise measurement in various stages of LNG production, liquefaction, storage, and transportation. Their non-intrusive nature, high accuracy, compatibility with harsh operating conditions, and cost-effectiveness make them an integral part of the LNG industry. As the demand for LNG continues to rise, the implementation of ultrasonic gas flow meters will undoubtedly play a vital role in achieving optimal efficiency, safety, and sustainability in the LNG industry.

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