What are the advantages and disadvantages of gas turbine flowmeters?

Project Overview

1. The gas flow meter has high precision, small pressure loss, low starting flow, automatic tracking and compensation of temperature, pressure and flow, battery power supply, can output a variety of signals, imported bearings, long life, easy installation Easy to maintain. The intelligent speed flow meter integrates flow, temperature, and pressure detection functions and can perform temperature and pressure compensation. It has the advantages of high accuracy, good repeatability, wide measurement range, and easy installation and use.

2. The gas flow meter is a velocity instrument that measures the flow of gas media in a closed pipeline. Suitable for accurate measurement of gas volume in gas and other industrial fields. Due to its small size, high precision and good repeatability. It absorbs the advanced structure of similar foreign products, undergoes optimized design, and integrates gas mechanics, fluid mechanics, electromagnetics and other theories. A new product developed by ourselves using advanced transmission structure.

3. The gas flow meter is a new generation flow meter that integrates flow, temperature, and pressure detection functions and can automatically compensate for temperature, pressure, and compression factors. It is used in petroleum, chemical industry, electric power, metallurgy, It is an ideal instrument for gas measurement in industrial industries such as industrial boilers, urban natural gas, gas pressure regulating stations and gas trade measurement. It has the characteristics of small pressure loss, high accuracy, low initial flow rate, good anti-vibration and anti-pulsating flow performance, and wide range ratio.

Gas turbine flow meters are widely used in the measurement of natural gas, coal gas, liquefied gas, light hydrocarbon gas and other gases. It is a new intelligent instrument that integrates turbine flow sensor and display integration, developed using advanced ultra-low power consumption single-chip microcomputer technology. It adopts double-row LCD on-site display, has a compact structure, intuitive and clear readings, high reliability, and is not affected by external power supply. Interference, lightning resistance, low cost and other obvious advantages. The instrument has six-point correction of the instrument coefficient, intelligently compensates for the nonlinearity of the instrument coefficient, and can be corrected on site.

The main advantages of gas turbine flow meters:

1. High accuracy: the full range is generally 1%-2.0%, and the high-precision type is 0.5%-1.0%; it is high-precision A kind of degree.

2. Good repeatability: generally up to 0.05% ~ 0.2%. Due to its good repeatability, high accuracy can be achieved through frequent calibration or online calibration, so it is used in trade settlement. One of the preferred flowmeters.

3. Wide range: medium and large diameters can generally reach more than 20:1, small diameters are 10:1, and the initial flow rate is also low.

4. The pressure loss is small: generally 0.1~2.5kPa under normal pressure.

5. Compact structure, light volume, easy to install and use, and large circulation capacity.

6. A variety of display modes can be used. It can only be equipped with a mechanical counter or only an ordinary flow totalizer. It can also add a temperature and pressure compensator to the mechanical counter, or it can only be equipped with a temperature and pressure compensator. , and can be powered by lithium batteries for a long time and is easy to use.

7. Since pulse frequency signal output is generally used, it is suitable for total measurement and connection with computers, without zero drift and anti-interference ability.powerful. At the same time, if high-frequency signal output is used, a very high frequency signal (3-4kHz) can be obtained with strong signal resolution.

Main Disadvantages of Gas Turbine Flowmeters

1. To maintain calibration characteristics for a long time, regular calibration is required. Suspended solids or corrosive components contained in the medium will cause problems such as bearing wear and jamming, which will change its accuracy and limit its scope of application. Although the situation has improved after using wear-resistant carbide shafts and bearings, this problem Still exists. Therefore, it must be calibrated regularly. For trade storage and transportation and high-precision measurement requirements, it is best to be equipped with on-site calibration equipment.

2. Regularly add oil to ensure sufficient lubrication of the bearings to ensure measurement accuracy and extend service life.

3. The physical properties of the medium (such as density, viscosity, etc.) have a great influence on the characteristics of the turbine flowmeter. The gas flow meter is easily affected by density and is closely related to temperature and pressure, so it needs to be corrected for temperature and pressure.

Occasions where the gas turbine flowmeter is not suitable

1. The gas turbine flowmeter is greatly affected by the flow field distribution. Therefore, for flowmeters without rectifiers at the inlet, the upper sensor of the sensor should be adjusted as required. A straight pipe section is provided on the downstream side. For flowmeters designed with a rectifier at the inlet, the length of the straight pipe section should also be set according to the instructions for use.

2. It is not suitable for use in situations with strong pulsating flow, nor is it suitable for the measurement of mixed-phase flow.

3. The cleanliness requirements of the measured medium are relatively high, and filters need to be installed as required, but this also brings about an increase in pressure loss.

4. The flow characteristics of small-diameter turbine flowmeters are seriously affected by physical properties, so it is difficult to improve the performance of small-diameter turbine flowmeters. For example, the small diameter is DN25, but its range is only 10:1 and its high accuracy is only ±1.0%.

5. It is not allowed to be used in situations where quick switches exist.