What Is a Natural Gas Flow Meter?

The natural gas flow meter is manufactured using the Carmen vortex street principle. It has the advantages of high measurement accuracy, wide measuring range, low power consumption, convenient installation, simple operation, and small pressure loss. It can measure working volume flow or standard volume flow (integrated intelligent temperature, Pressure compensation), according to user needs, can be equipped with pulse or 4 ~ 20mADC current output function. Is currently the ideal gas meter.

Natural gas flow meter

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natural gas

Xiamen Hongkong instrument's overall structure design is reasonable, the dynamic measurement range is wide, and the pressure loss is small; the instrument body can be made of stainless steel, which is suitable for the measurement of corrosive media; the instrument has no moving parts, and is easy to install and maintain;

In the fluid pipeline, a cylindrical barrier is inserted vertically, and vortices are alternately generated on both sides of the rear (relative to the direction of fluid flow). As the fluid flows downstream to form a vortex train, we call it Carmen Vortex Street. We define a cylindrical barrier that generates a vortex as a vortex generator. Experiments show that under certain conditions, the frequency of vortex separation is linear with the flow velocity of the fluid. Therefore, as long as the frequency of vortex separation is detected, the flow velocity or flow rate of the pipe body can be calculated.

The development of flow measurement can be traced back to ancient water conservancy projects and urban water supply systems. In the Roman caesar era, orifice plates were used to measure the drinking water of residents. Weir method was used in ancient Egypt around 1000 BC to measure the discharge of the Nile. The well-known Dujiangyan water conservancy project in our country uses the water level of the treasure bottle mouth to observe the amount of water and so on. In the 17th century, Torri demolition laid the theoretical foundation for differential pressure flow meters, which is a milestone in flow measurement. Since then, the prototypes of many types of instruments for flow measurement in the 18th and 19th centuries have begun to form, such as weirs, tracers, pitot tubes, venturis, volumes, turbines, and target flow meters. In the 20th century, due to the rapid increase in demand for flow measurement in process industry, energy metering, and urban utilities, the rapid development of meters was promoted. The rapid development of microelectronics and computer technology has greatly promoted the upgrading of meters, and new flowmeters have sprung up like mushrooms. . So far, it is said that hundreds of flowmeters have been put on the market, and many difficult problems in field use are expected to be solved.

It is relatively late to carry out modern flow measurement technology in China, and the flow meters required in the early days are imported from abroad.

Flow measurement is a science that studies the change of mass. The law of mass change is the basic law of the development of the relationship between things. Therefore, the measurement object is not limited to the traditional pipeline liquid. There is a problem of flow measurement in all places where the volume change needs to be mastered. Flow rate, pressure and temperature are listed as the three major detection parameters. For a certain fluid, as long as these three parameters are known, the energy can be calculated, and these three parameters must be detected in the measurement of energy conversion. Energy conversion is the basis of all production processes and scientific experiments, so flow and pressure and temperature instruments are the most widely used.

As a high-quality energy and chemical raw material, the measurement of natural gas has been paid more and more attention. Developed countries with higher levels of industrialization, such as Europe and the United States, started the research on natural gas metering technology earlier, with large investment funds and scientific and technological strength, and especially paid great attention to the measurement of natural gas for trade. From the selection of flowmeters, turbines and waist-wheel flowmeters are mainly used in Europe. For example, the use of turbines and waist-wheel flowmeters in the Netherlands accounts for about 80%, and the use of turbine-flowmeters in Canada accounts for about 90%. Orifice plates are dominant, accounting for about 80%. On the whole, in the use of flowmeters, the climax of orifice plate use in the 1970s, the climax of the use of turbine flowmeters in the 1980s, and the surge of ultrasonic flowmeters in the mid-to-late 1990s.

In terms of flow standards, flow workers from various countries have spent a lot of time and worked hard. After analyzing and summarizing a large number of experimental and application data, they have successively introduced representative standards such as the natural gas flow standard orifice plate measurement standard (AGA No.3), Gas Turbine Flowmeter Standard (AGA No.7), Natural Gas and Other Hydrocarbon Gas Compressibility and Supercompressibility Standard (AGA No.8), Gas Ultrasonic Flowmeter Measurement of Natural Gas Standard (AGA No.7) 9) Standard for measuring fluid flow with differential pressure device (ISO5167), gas turbine flowmeter standard (ISO9951), gas ultrasonic flowmeter standard (ISO / TR12765), and natural gas compression factor calculation standard (ISO / DIS12213), etc., these standard procedures It has a positive guiding significance for natural gas flow measurement.

The application of natural gas flowmeters is extensive, and the applications of flow measurement technology and instruments have roughly the following areas.

First, the industrial production process

Flow instrument is one of the large-scale instruments in process automation instruments and devices.It is widely used in metallurgy, electricity, coal, chemical industry, petroleum, transportation, construction, light textile, food, medicine, agriculture, environmental protection and people's daily life. In other areas of the national economy, important tools for developing industrial and agricultural production, saving energy, improving product quality, improving economic efficiency and management levels occupy an important position in the national economy. Among the process automation instruments and devices, the flow meter has two major functions: as a detection instrument for the process automation control system and a total meter for measuring the quantity of materials.

two,

Technical analysis The density of coke oven gas, mixed air and natural gas commonly used in natural gas flow meters are 0.94kg / m3, 1.8kg / m3, 0.75kg / m3. Considering the most unfavorable working conditions, when using LPG mixed air, it is feasible to use DN15mm steel pipe to supply the top layer (5 layers) from the bottom layer.

. The new installation method mainly increases the cost of the large meter box, and the labor costs are almost the same. Compared with the previous installation method of using a DN32mm riser to cross the wall, the new method uses an average installation cost of about 2,800 yuan per household, while the old installation method uses about 2,600 yuan per household.

Economic analysis For newly installed users, the gas meter is calculated on an even 6-story basis. The new installation method is used to install the gas meter in the bottom gas meter box, and DN15mm galvanized steel pipes are used for home.