Saturated steam vortex flowmeter-Fornitore globale

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Saturated steam vortex flowmeter

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Saturated steam

Vortex FlowmeterAdvantages:
① JD-LU IntelligentVortex FlowmeterThe biggest advantage is its excellent anti vibration performance, no zero drift, and high reliability. Over a long period of timeVortex FlowmeterThrough extensive waveform analysis and spectrum analysis, Huatian has designed the optimal probe shape, wall thickness, height, probe rod diameter, and matching piezoelectric crystal. Advanced CNC lathes are used for processing to ensure technical parameters such as coaxiality and smoothness, combined with special processing techniques to overcome them to the greatest extent possibleVortex FlowmeterThe common problem is the influence of inherent self oscillation frequency on signals. This is produced by Huatian CompanyVortex FlowmeterThe unique technological advantages in this field enable Huatian Company to produceVortex FlowmeterHas good anti vibration ability.
② FFM63 series intelligentVortex FlowmeterThe universality of the sensor is very strong, which makes the sensor have good interchangeability. Advanced CNC equipment is used to process the sensor's body and vortex generator, ensuring machining accuracy. This makes the universality of the components (especially the vortex generator) strong, and truly ensures that the repeatability and accuracy of the sensor will not be affected by the replacement of components; Capable of generating strong and stable vortex signals.
③ The structure is simple and sturdy, with no movable parts, high reliability, and easy to use and maintain.
④ The detection component does not come into contact with the medium, with stable performance and long service life
The sensor adopts a detection probe installed separately from the vortex generator, and a high-temperature resistant piezoelectric crystal is sealed inside the detection probe, which does not come into contact with the measured medium. Therefore, the FFM63 series vortex flowmeter has the characteristics of simple structure, good universality, and high stability.
⑤ Output pulse signals or analog signals proportional to the flow rate, without zero drift, high accuracy, and convenient networking with computers
⑥ Wide measurement range, with a range ratio of up to 1:10
⑦ When measuring volumetric flow rate with a vortex flowmeter, no compensation is required. The signal output by the vortex flowmeter is actually linearly related to the flow rate, that is, directly proportional to the volumetric flow rate. The purpose of pressure and temperature compensation is to obtain the density of the fluid, which is multiplied by the volumetric flow rate to obtain the mass flow rate. If measuring the volumetric flow rate of a gas, compensation is not required.
⑧ Low pressure loss.
Using a DN50 vortex flowmeter to measure the flow rate of combustible gas, if the maximum flow rate Qmax in the pipeline is 200m3/h, the pressure loss of the sensor is: △ P=1.08 × 10-6 ρ v2 (kPa)=0.605 KPa
⑨ Within a certain Reynolds number range, the flow characteristics are not affected by fluid pressure, temperature, viscosity, density, or composition, but only by the shape and size of the vortex generator.
⑩ Widely applicable, capable of measuring the flow rates of steam, gas, and liquid.


intelligenceVortex Flowmeter	Intelligent with temperature and pressure compensationVortex Flowmeter	Plug in intelligent with ball valveVortex Flowmeter

When a triangular cylindrical vortex generator is set up in the fluid, regular vortices are alternately generated from both sides of the vortex generator, which are called Karman vortices. As shown in the right figure of Jiangsu Zhongyi Automation, the vortex columns are asymmetrically arranged downstream of the vortex generator.
Assuming the frequency of vortex occurrence is f, the average flow velocity of the measured medium is, the width of the upstream surface of the vortex generator is d, and the diameter of the body is D, the following relationship can be obtained:

F=SrU1/d=SrU/md (1)
In the formula, U1 represents the average velocity on both sides of the vortex generator, m/s；
Sr Strouhal number;
M - the ratio of the bow shaped area on both sides of the vortex generator to the cross-sectional area of the pipeline

The volumetric flow rate qv inside the pipeline is
Qv=π D2U/4=π D2mdf/4Sr (2)
K=f/qv=[π D2md/4Sr] -1 (3)
In the formula, K represents the instrument coefficient of the flowmeter, with pulse count in m3 (P/m3).
K is not only related to the geometric dimensions of the vortex generator and pipeline, but also to the Strouhal number. The Strouhal number is a dimensionless parameter that is related to the shape of the vortex generator and the Reynolds number. Figure 2 shows the relationship between the Strouhal number of a cylindrical vortex generator and the Reynolds number of a pipeline. As shown in the figure, Sr can be regarded as a constant within the range of ReD=2 × 104 to 7 × 106, which is the normal operating range of the instrument. When measuring gas flow rate, the flow calculation formula for VSF is

(4)

Figure 2: The relationship curve between Strouhal number and Reynolds number

In the formula, qVn and qV represent the volumetric flow rates under standard conditions (0oC or 20oC, 101.325kPa) and operating conditions, respectively, m3/h；
Pn and P are the absolute pressures under standard and operating conditions, respectively, Pa；
Tn, T - thermodynamic temperatures under standard and operating conditions, respectively, K；
Zn and Z represent the gas compression coefficients under standard and operating conditions, respectively.
As can be seen from the above equation, the pulse frequency signal output by VSF is not affected by fluid properties and composition changes, that is, the instrument coefficient is only related to the shape and size of the vortex generator and pipeline within a certain Reynolds number range. However, as a flowmeter in material balance and energy measurement, it is necessary to detect mass flow rate. At this time, the output signal of the flowmeter should simultaneously monitor volume flow rate and fluid density. Fluid properties and components still have a direct impact on flow measurement.

Vortex FlowmeterIt is a new type of flowmeter for measuring fluid flow in closed pipelines based on the Karman vortex principle. Due to its excellent medium adaptability, it can directly measure the volumetric flow rate of steam, air, gas, water, and liquid without temperature and pressure compensation. Equipped with temperature and pressure sensors, it can measure standard volumetric flow rate and mass flow rate, making it an ideal alternative to throttling flow meters.
To improveVortex FlowmeterOur company has recently developed an improved SDLU vortex flow sensor with high temperature resistance and vibration resistance. Due to its unique structure and material selection, the sensor can be used in harsh working conditions such as high temperature (350 ℃) and strong vibration (≤ 1g).
In practical applications, the maximum flow rate is often much lower than the upper limit of the instrument, and with changes in load, the minimum flow rate is often lower than the lower limit of the instrument. The instrument is not working in its optimal working range. To solve this problem, it is usually necessary to reduce the diameter at the measuring point to increase the flow rate at the measuring point, and use smaller diameter instruments to facilitate the measurement of the instrument. However, this variable diameter method requires a straight pipe section with a length of more than 15D between the variable diameter pipe and the instrument for rectification, which makes processing and installation inconvenient. Our company has developed an LGZ variable diameter rectifier with a curved longitudinal section, which has multiple functions such as rectification, increasing flow velocity, and changing flow velocity distribution. Its structural size is small, only one-third of the inner diameter of the process pipe, and it is integrated with the vortex flowmeter. It not only does not require an additional straight pipe section, but also reduces the requirements for the straight pipe section of the process pipe, making installation very convenient.

For the convenience of use, the battery powered local display vortex flowmeter adopts low-power high-tech. It can operate continuously for more than a year with lithium battery power supply, saving the procurement and installation costs of cables and display instruments. It can display instantaneous flow, cumulative flow, etc. on site. Integrated temperature compensation systemVortex FlowmeterIt also comes with a temperature sensor that can directly measure the temperature of saturated steam and calculate the pressure, thereby displaying the mass flow rate of saturated steam. The temperature pressure compensation integrated type is equipped with temperature and pressure sensors, which can directly measure the temperature and pressure of the gas medium for gas flow measurement, thereby displaying the standard volume flow rate of the gas.
Measurement medium: gas, liquid, vapor
◆ Caliber specifications: Flange card mounted caliber selection: 25, 32, 50, 80, 100
◆ Flange connection type with a diameter selection of 100, 150, 200
What is the normal measurement range for flow rate? Reynolds number ranging from 1.5 × 104 to 4 × 106; Gas velocity of 5-50m/s; Liquid 0.5-7m/s
The normal measurement range for liquid and gas flow is shown in Table 2; The steam flow range is shown in Table 3
Measurement accuracy level 1.0? Level 1.5
◆ Temperature of the tested medium: normal temperature -25 ℃~100 ℃
◆ High temperature -25 ℃~150 ℃ -25 ℃~250 ℃
Output signal pulse voltage output signal high level 8-10V low level 0.7-1.3V
The pulse duty cycle is about 50%, and the transmission distance is 100m
Pulse current remote transmission signal 4-20 mA, transmission distance of 1000m
◆ Instrument operating environment temperature: -25 ℃~+55 ℃ humidity: 5-90% RH50 ℃
◆ Material: Stainless steel, aluminum alloy
◆ Power supply DC24V or lithium battery 3.6V
Explosion proof grade intrinsic safety type iaIIbT3-T6
Protection level IP65

Product parameters

Instrument model	JD-LU-N	JD-LU-A	JD-LU-B	JD-LU- C	JD-LU- D1/D2
signal output	pulse	4-20mA	not have	4-20mA	Optional 4-20mA or pulse
power supply	24VDC±15%	24VDC±15%	lithium battery	24VDC±15%	24VDC ± 15% and lithium battery
communication interface	not have	not have	not have	Optional RS485	Optional RS485
accuracy class	Liquid: Grade 1.0 Gas: 1.0 grade Steam: Level 1.5		Liquid: Grade 1.0 Gas: 1.0 grade Steam: Level 1.5		Liquid: Grade 1.0 Gas: 1.0 grade Steam: Level 1.5
monitor	not have		have		have
Instrument material	304SS		304SS		304SS
Explosion proof grade	Optional ExiaICIT5 or ExdIIBT6		Optional ExiaICIT5 or ExdIIBT6		Optional ExiaICIT5 or ExdIIBT6
protection grade	IP65		IP65		IP65
Overall Power Consumption	＜1W		＜1W		＜1W
Instrument communication	DN15~DN300		DN15~DN300		DN15~DN300
Installation method	Flange clamping or integrated flange connection		Flange clamping or integrated flange connection		Flange clamping or integrated flange connection
Voltage resistance level	Optional 1.6MPa or 2.5MPa		Optional 1.6MPa or 2.5MPa		Optional 1.6MPa or 2.5MPa
medium temperature	-40 ℃~250 ℃- 40℃~350℃		-40 ℃~250 ℃- 40℃~350℃		-40 ℃~250 ℃- 40℃~350℃
ambient temperature	-20℃~60℃		-20℃~60℃		-20℃~60℃

Measurement range and pressure level

Instrument caliber（mm）	Liquid measurement range（m3/h）	Gas measurement range(m3/h)
DN15	0.3-6	2.2-30
DN20	0.6-12	4-50
DN25	1.2-16	8-55
DN32	1.6-30	18-130
DN40	2-40	27-200
DN50	3-60	35-350
DN65	5-100	60-600
DN80	6-130	86-1100
DN100	15-220	130-1300
DN125	20-340	240-2800
DN150	30-450	340-4000
DN200	45-800	560-8000
DN250	65-1250	890-11000
DN300	95-2000	1360-18000

How to choose the correct installation point

Choosing the correct installation point and installing the sensor correctly are both very important steps. If there are errors during the installation process, it can affect the measurement accuracy, and in severe cases, it can affect the service life of the sensor and even damage it. Considering the convenience of installation and disassembly, a pipeline expansion joint can be installed after the flowmeter;

　Requirements for straight pipe sections

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Sensors have certain requirements for the upstream and downstream straight pipe sections of the installation point, otherwise it will affect the measurement accuracy. If there is a>15 ° tapered pipe upstream of the sensor installation point, there should be an equal diameter straight pipe section of not less than 15D upstream of the sensor, and an equal diameter straight pipe section of not less than 5D downstream.
If there is a>15 ° expansion pipe upstream of the sensor installation point, there should be an equal diameter straight pipe section of not less than 18D upstream of the sensor, and an equal diameter straight pipe section of not less than 5D downstream.
If there is a 90 ° bend or T-shaped joint upstream of the sensor installation point, there should be an equal diameter straight pipe section of not less than 20D upstream of the sensor, and an equal diameter straight pipe section of not less than 5D downstream.
If there are two 90 ° elbows on the same plane upstream of the sensor installation point, there should be an equal diameter straight pipe section of not less than 25D upstream of the sensor and an equal diameter straight pipe section of not less than 5D downstream.
If there are two 90 ° elbows on different planes upstream of the sensor installation point, there should be an equal diameter straight pipe section of not less than 40D upstream of the sensor and an equal diameter straight pipe section of not less than 5D downstream.
The flow regulating valve or pressure regulating valve should be installed as far downstream as possible 5D from the sensor. If it must be installed upstream of the sensor, there should be an equal diameter straight pipe section of not less than 50D upstream and an equal diameter straight pipe section of not less than 5D downstream.

Characteristic note:
·If a valve is installed near the upstream of the sensor installation point, constantly opening and closing the valve will greatly affect the service life of the sensor and easily cause permanent damage to the sensor.
·Sensors should be avoided from being installed on very long overhead pipelines during the day. Over time, the sagging of the sensor can easily cause seal leakage between the sensor and the flange. If installation is necessary, pipeline fastening devices must be installed at 2D positions upstream and downstream of the sensor.

　Requirements for piping

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Sensors have certain requirements for the upstream and downstream straight pipe sections of the installation point, otherwise it will affect the measurement accuracy.
The inner diameter of the upstream and downstream piping of the sensor installation point should be the same as the inner diameter of the sensor, and it should meet the requirements of the following formula.

0.98DN≤D≤1.05DN

In the formula:

DN - Sensor diameter
D - Inner diameter of piping

The piping should be concentric with the sensor, and the coaxial diameter should not exceed 0.05DN.
The sealing gasket of the sensor and flange cannot protrude into the pipeline, and its inner diameter can be slightly larger than that of the sensor.

　Requirements for bypass pipes

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For the convenience of repairing the sensor, it is best to install a bypass pipe for the sensor. In addition, if the fluid in the pipeline that needs to be cleaned or the pipeline where the sensor is installed cannot be stopped for maintenance of the sensor, it must be installed in the bypass pipe and ensure that the front and rear straight pipe sections are maintained

　Requirements for pipeline vibration

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Sensors should be avoided from being installed on pipelines with strong vibrations as much as possible. If installation is necessary, vibration reduction measures must be taken. Pipeline fastening devices should be installed at the 2D positions upstream and downstream of the sensor, and anti vibration pads should be added.
Special attention: The vibration at the outlet of the air compressor is strong, and sensors cannot be installed. They should be installed after the air storage tank.

Requirements for the external environment

1. Sensors should be installed in places with large temperature changes and exposed to thermal radiation from equipment. If installation is necessary, insulation and ventilation measures must be taken.
2. Sensors should be avoided from being installed in environments containing corrosive gases. If installation is necessary, ventilation measures must be taken.
3. It is best to install the sensor indoors. If it must be installed outdoors, moisture-proof and sun protection measures must be taken, and attention should be paid to whether water will flow into the amplifier through the cable
Inside the container.
4. There should be ample space around the installation of sensors, including lighting fixtures and power sockets, for easy installation, wiring, and maintenance.
5. The wiring position of the sensor should be away from electrical noise, such as high-power transformers, motors, and power supplies.
6. There should be no radio transceiver near the installation point of the sensor, otherwise high-frequency noise will interfere with the normal use of the sensor.

Installation of sensors on horizontal pipelines

Installation on horizontal pipelines is the most commonly used installation method for flow sensors.
When measuring gas flow, if the measured gas contains a small amount of liquid, the sensor should be installed at a higher position in the pipeline

√

When measuring liquid flow rate, if the measured liquid contains a small amount of gas, the sensor should be installed at a lower part of the pipeline.

√

Installation of sensors in vertical pipelines

When measuring gas flow, the sensor can be installed on a vertical pipeline with no restrictions on the flow direction. If the tested gas contains a small amount of liquid, the gas flow should be from bottom to top.

When measuring liquid flow rate, the liquid flow direction should be from bottom to top, so as not to add additional liquid weight to the probe.

Sensors installed on the side of horizontal pipelines

Regardless of the type of fluid being measured, sensors can be installed on the upper side of horizontal pipelines. Especially for measuring superheated steam, saturated steam, and low-temperature liquids, if conditions permit, it is best to use side mounting, so that the temperature of the fluid has less impact on the amplifier.

Inverted sensor in horizontal pipeline

This installation method is generally not recommended. This installation method is not suitable for measuring general gases and superheated steam. Can be used to measure saturated steam, suitable for measuring high-temperature liquids or situations that require frequent pipeline cleaning.

This instrument adopts a flange clamping type (also known as a pair clamping type, clamping type). Tighten the long bolt and clamp the sensor with two flanges. The flange concave part covers the sensor, and the flange convex part covers the user pipe. The installation steps are as follows:
1. Calculate the installation dimensions first;
2. Cut the pipeline to be installed on a sawing machine and repair the saw edge;
3. Install the flange onto the pipeline, fix it, spot weld it first, and then weld it in a complete circle to check if it is intact;
4. Repeat the previous step and weld the other flange together;
5. Move the welded flange pipeline to the installation site, integrate the pipeline with the sensor, and then install it on the pipeline;
6. Check if each link is intact, slowly open the valve, and observe if there is any leakage.

Special attention:
① The fluid flow direction must be consistent with the flow arrow on the sensor body;
② When installing sensors, during the welding of flanges or pipelines, the sensors must not be on the pipeline to avoid damagesensorElectronic amplification circuit;
③ The flanges on both sides of the sensor must be kept parallel, otherwise it is easy to leak.