Large caliber gas ultrasonic flowmeter

1.Main performance characteristics of the product

Solving the measurement difficulties of large diameter, low flow rate, high dust, multi-component gas in coke oven gas

1.1 Leading 100:1 range ratio performance

Thanks to its unique ultrasonic sensor structure and patented design, we have independently developed a high-power ultrasonic air transducer. Based on intelligent anti-interference algorithm technology, signal multispectral feature setting and signal processing system, achieving accurate measurement as low as 0.1m/s

1.2 Key core technology: intelligent anti-interference algorithm technology

1.3 Leading energy-saving performance - no voltage loss

Unique sensor structure design without throttling components, without pressure loss and without affecting the normal flow of fluid; Thus reducing energy consumption during fluid transportation and directly creating energy-saving economic benefits for users.

1.4 Ultra low straight pipe section requirements

1.5 Bidirectional flow measurement

1.6 Resistant to dirt and high temperature

The maintenance amount is extremely low, which is the smallest among all flow meters and can achieve long-term maintenance free

2.Product technical indicators

2.1 AFD series gas ultrasonic flow meter (velocity type flow meter)

2.1.1Speed calculation method

The working principle of the CFD700S ultrasonic flowmeter is the time difference method. The basic working principle is that the time for sound waves to propagate from upstream to downstream in a fluid is less than the time for sound waves to propagate from downstream to upstream. There is a strict mathematical relationship between the difference between these two times and the speed of the airflow. Based on this data relationship, the following expression for gas flow rate can be obtained：

In equation (1)：

 Tup ------------The time of ultrasonic wave propagation in gas against the current；
 Tdown---------Time of ultrasonic wave propagation in gas flow；
 L --------------Channel length；
 Cf -------------The velocity of sound waves propagating in fluids；
 Vm------------Axial average velocity of gas；
 ----------------Vocal angle。

2.1.2Flow calculation method

Due to the fact that the fluid flow velocity of the sound channel is measured by multiple pairs of ultrasonic channels, the average flow velocity of the cross-section is the average flow velocity. Additionally, due to the shape of the cross-section and processing reasons of the circular flue, certain corrections are needed. So the volumetric flow rate is：

In equation (2)
 q --------- Volumetric flow rate
 K--------- Correction coefficient of flow field in pipeline
 A--------- Flow area of gas fluid
 v--------- Average velocity of sound waves propagating through multiple channels in a fluid

2.2 AFD700S series split type gas ultrasonic flowmeter

2.2.1characteristic

Low measurement limit, up to a minimum of 0.1m/s
Linear average flow rate measurement, high measurement stability
Time difference method for measurement, with high measurement accuracy and a measurement resolution of 0.01m/s
The use of corrosion-resistant Teflon probes can be used to resist the corrosion of corrosive gases
Without moving parts, maintenance can be minimized
Using an LCD screen display can adapt to a wider outdoor working temperature
Automatic online zero calibration and cross range calibration
Data retention for 1 year
Obtaining CPA certification from the national metrology department

The product meets the requirements of national environmental protection documents

2.2.2application

Power industry, metallurgy industry, building materials industry, manufacturing industry, coking industry

2.2.3 Technical Parameter

2.2.4 AFD700S Selection code

2.3 AFD800S Series Coke Oven Gas Ultrasonic Flowmeter

2.3.1Characteristics of coke oven gas:

The coke oven gas itself contains naphthalene, tar, saturated water vapor, and fine dust impurities. The naphthalene and tar in it will form crystals and adhere to the flow sensor body due to temperature changes, especially the Pitot tube, Wilbur, and orifice plate with differential pressure principle have a greater impact.

For differential pressure gas flow meters, the measurement accuracy is influenced by factors such as gas density, moisture, and dust.

The low flow rate of coke oven gas limits the use of gas flow meters based on differential pressure principles, such as Weiliba and V-cone flow meters, which use differential pressure working principles, and the lower measurement limit is affected to a certain extent.

Compared to the above problems, the time difference method gas ultrasonic flowmeter has better solved the above problems. Therefore, it is recommended to use a gas ultrasonic flow meter.

characteristic:

1.1The ultrasonic flow meter uses sound waves for measurement, and the probe can be retracted into the inner sleeve for measurement to avoid
Direct contact with gas flow effectively prevents naphthalene crystallization and coal tar adhesion;
1.2Time difference method measurement, unaffected by changes in gas composition, density, and moisture;
1.3Linear average flow rate measurement, high measurement stability；
1.4The lower limit of ultrasonic flow meter measurement is 0.05 meters/second, which is extremely low and has high measurement accuracy;
1.5Without moving parts, maintenance can be minimized;
1.6Using an LCD screen display can adapt to a wider outdoor working temperature;
1.7Automatic online zero calibration and cross range calibration;

2.3.2 application

Power industry, metallurgy industry, building materials industry, manufacturing industry, coking industry

2.3.3 Technical Parameter

2.2.4Gas physical quantity

2.2.5AFD800S Selection code for plug-in gas ultrasonic flowmeter 

 3.Performance table

Performance Table of Flue Gas Ultrasonic Flowmeter