Development trend of the hottest flow meter

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Development trend of flow meter

flow meter is a tool to measure the change of material quality. It is not only widely used in various industrial fields and municipal engineering, but also an important means to improve product quality, economic benefits and management level; It is also the scientific basis for evaluating energy conservation, consumption reduction and pollution emission. Due to many influencing factors, there are more than 10 kinds of instrument principles and no less than 200 types. In the industrial automation system, it is the signal source. Although the quantity accounts for only 1/5 of the system automation instruments, the price accounts for about 1/3; It accounts for more than half of the monitoring instruments in the scientific evaluation of energy conservation, consumption reduction and pollution emission. Therefore, it plays an important role in the national economy

I. market evaluation

1 Foreign markets

according to the network survey of flowresearch, under the general depression of the international economy in the past five years, the annual average growth rate (CAGR) of the world market of flow meters has still reached 2.6%, and the sales volume has increased from $3.1 billion in 2002 to $3.5 billion in 2007. Among them, the traditional instruments (throttling, volume, turbine, rotameter, etc.) have negative growth, and the CAGR is -2.2%, From US $1.643 billion (53% of the total) in 2002 to US $1.505 billion (43% of the total) in 2007; The annual growth rate of new demand deep development instruments (electromagnetic, ultrasonic, Coriolis flowmeter, etc.) reached an average of 6.2%, from $1.457 billion in 2002 to $2.019 billion in 2007. Among them, the annual growth rate and sales of electromagnetic, ultrasonic, Coriolis flowmeter are shown in Table 1. The CAGR of electromagnetic flowmeter is less than 2%, because its base number is large and its technology is relatively mature

according to the survey, turbine flowmeter is commonly used to measure gases or liquids with small viscosity in many countries in the world. Due to the rotating parts in the instrument and the heavy maintenance workload, the CAGR in the past five years is -3.2%, and the sales fell from $410million in 2002 to $348million in 2007. Experts believe that although ultrasonic has an aggressive growth momentum in recent years, the turbine is much cheaper than ultrasonic and has a price advantage; Compared with throttling device, the range ratio can reach 10:1, and it is more accurate. In trade settlement, small and medium-sized customers are still willing to choose it. The volumetric flow instrument is a non velocity instrument, which has no straight pipe section requirements for installation, and its accuracy can generally reach ± 0.5%, but it is bulky. The caliber is generally less than 0.2m. In the past five years, the sales volume decreased from US $520million in 2002 to US $452million in 2007, with a CAGR of -2.7%. Experts believe that it is a general development trend for new instruments to replace traditional instruments in many fields, but the process will be long. Please log in: power transmission and distribution equipment to browse more information

source: power transmission and distribution equipment

2 Domestic market

according to statistics, in the domestic automation instrument market in 2005, the annual sales of flow meters expressed 2.3 billion yuan; The pressure transmitter is about 1.8 billion yuan (of which about 500million yuan of differential pressure transmitter is matched with differential pressure flowmeter); 1.2 billion yuan for temperature instruments; The material level and liquid level instruments are 1billion yuan. In terms of the type of flow instrument, due to the heavy throttling device and relatively low technical content, foreign manufacturers have basically not been involved in this kind of production, and the once input data is permanently reused; In addition, the formula can be self modified to improve the Chinese market of test data compliance products. The selection of such instruments in China's projects is also mainly based on domestic products, with an annual sales volume of no less than 200000 sets, about more than 600million yuan

there is a big gap between China and foreign countries in the research and development of flow meters, and most of them are satisfied with imitation. This problem can be seen from the famous Instrument Exhibition miconex2006. A total of 297 flow meters with more than 10 principles were exhibited by Chinese and foreign manufacturers in this exhibition, which are listed in Table 2 according to the frequency of exhibition. It can be seen from table 2 that among the 16 items classified, 204 manufacturers, accounting for 69% of the total, have exhibited the first six exhibits due to the measurement of modulus in this area, indicating that they are the focus of attention of domestic and foreign instrument manufacturers at present. Among them, Coriolis flowmeter, 17 exhibitors abroad, accounting for 68% of the total, and only 8 exhibitors in China. Does it indicate whether China pays insufficient attention to this instrument that accurately measures mass flow; The internal cone flowmeter, domestic exhibitors reached 30, accounting for 91% of the total; There are only three foreign companies. Is the domestic market overheated

Table 2 also reflects the following situations:

· electromagnetic flowmeter is still the hot spot in flow instruments, ranking first. China's major instrument manufacturers (Shanghai Guanghua, Weitai, Kaifeng instruments, Chongqing Chuanyi) list them as their main products. According to the evaluation of arc consulting company of the United States, China has paid special attention to environmental protection in recent years, relying on the rapid development of water supply/drainage, metallurgy, mining, pulp and pharmaceutical industry. In the next five years, the CAGR of electromagnetic flowmeter in China will reach 10.7%, which is expected to increase from 380million in 2003 to 640million yuan in 2008

· ultrasound has many advantages, such as accuracy, small pressure loss, and is especially suitable for the trade measurement of precious fluids. Both at home and abroad pay more attention to it, but most of the domestic exhibits are for measuring liquids. Although there are also several for measuring gases, there are still some problems when it is used on site, especially for trade settlement

· there are also many thermoelectric exhibits. Because it can measure the mass flow, and it is found that the hardness of new materials reaches 9h, and the sensitivity is high, which has attracted the attention of the industry. However, its plug-in form can only measure dry and pure gas, and the accuracy is not as high as the manufacturer advertises, so it is still some time before it is practical

II. Development trend

1 The structure is becoming increasingly simple and portable

early flow meters are purely mechanical local displays, such as volumetric flow meters. Not only the structure is complex and bulky, but also the weight/diameter ratio is very large; And the rotating parts need frequent maintenance due to wear. With the increasing diameter of industrial pipelines, plug-in instruments are increasingly favored by users because of their simple structure, lightness and easy disassembly. In recent ten years, the fastest-growing electromagnetic and ultrasonic flow instruments have no rotating parts or resistance parts in the pipeline, with a simpler structure, small pressure loss and high accuracy. They are the flow instruments with the most development potential

2. Functions strive to be perfect and diverse

early flow instruments used local display (such as volume and rotor). With the continuous improvement of industrial level, dozens of instruments can no longer meet the process requirements for centralized display, adjustment and control. It is necessary to separate the sensor (also known as the primary meter, such as orifice plate, nozzle, inner cone) from the transmitter (also known as the secondary meter). The flow parameters are converted into electrical parameters and transmitted to the central control room remotely. With the further expansion of industrial scale, analog signals can no longer adapt, and the output signals need to be converted into digital signals to meet the requirements of fieldbus system and SCADA system

in order to increase the reliability of instruments, many instruments have added more than 10 self diagnostic functions. For example, optiflux electromagnetic flowmeter launched by KROHNE company can self diagnose various instrument conditions such as bubbles, electrode corrosion, crud, electrode short circuit, fluid conductivity, incomplete tube, lining damage, external magnetic field and so on

the diversification of instrument functions is also a development trend. For example, in addition to measuring flow, ultrasound can also measure fluid composition and sound velocity; Coriolis can measure not only the flow rate, but also the fluid density

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