Overview:
Metrology is the eye of industrial production. Flow measurement is one of the components of measurement science and technology, and it is closely related to the national economy, national defense construction, and scientific research. Doing this well will play an important role in ensuring product quality, improving production efficiency, and promoting the development of science and technology. Especially in the current era of energy crisis and increasing automation of industrial production, flow meters are in the national economy. The status and role of the company are more obvious.
The unit m3/h is commonly used in engineering. It can be divided into instantaneous flow rate (Flow Rate) and cumulative flow (Total Flow). Liquid, solid; cumulative flow is the cumulative amount of fluid flowing through the effective cross-section of a closed pipeline or open channel in a certain period of time (one day, one week, one month, one year). The cumulative flow can also be obtained by integrating the instantaneous flow with time, so the instantaneous flowmeter and the cumulative flowmeter can also be converted into each other.
development trend:
In the industrial field, the instruments that measure fluid flow are collectively referred to as flow meters or flow meters. It is one of the most important instruments in industrial measurement. With the development of industry, the requirements for the accuracy and scope of flow measurement are getting higher and higher. In order to adapt to multiple purposes, various types of flow meters have been introduced, which are widely used in oil and gas, petrochemical, water treatment, food and beverage, Pharmaceutical, energy, metallurgy, pulp and paper and construction materials industries.
Application range:
Flow measurement is widely used in various fields of industrial and agricultural production, national defense construction, scientific research, foreign trade, and people's lives. In the production of the petroleum industry, flow measurement runs through the entire process from oil extraction, transportation, refining, smelting and processing to trade sales, and flow measurement is inseparable from any link, otherwise the normal production and trade exchanges of the oil industry will not be guaranteed. . In the chemical industry, inaccurate flow measurement can cause imbalance in the distribution ratio of chemical components, which cannot guarantee product quality, and serious production safety accidents may occur. In the production of the electric power industry, the measurement and regulation of the flow of liquid, gas, steam and other media occupies an important position. The accuracy of flow measurement is not only of great economic significance for ensuring that power plants operate under the best parameters, but also with the development of high-temperature, high-pressure and large-capacity units, flow measurement has become an important part of ensuring the safe operation of power plants. If the instantaneous feed water flow of a large-capacity boiler is interrupted or reduced, it may cause a serious dry pot or tube burst accident. This requires the flow measurement device not only to achieve accurate measurement, but also to send out an alarm signal in a timely manner. In the steel industry, the flow measurement of circulating water and oxygen (or air) in the steelmaking process is one of the important parameters to ensure product quality. In light industry, food, textile and other industries, flow measurement is also inseparable.
The most widely used transducers are the clamp-on type and the plug-in type. The mono ultrasonic flowmeter is simple in structure and convenient to use, but this kind of flowmeter has poor adaptability to changes in flow pattern. The rapid development of microelectronics and computer technology has greatly promoted the replacement of meters, and new flowmeters have sprung up like bamboo shoots after a rain. So far, it is said that hundreds of flowmeters have been put on the market, and many thorny problems in field use are expected to be solved. The work of modern flow measurement technology in my country is relatively late. It is set at the upstream end of the measurement flow channel 6 and relative to the holes 11 and 12 to reduce the flow of the measured fluid into the holes 11 and 12; the measurement control component 19 is used for measurement The propagation time of the ultrasonic wave between the ultrasonic transducers 8 and 9; and the calculation part 20 for calculating the flow rate based on the signal of the measurement control part 19.
The flowmeter should try to avoid ferromagnetic objects and equipment with strong electromagnetic fields (such as large motors, large transformers, etc.) to prevent the magnetic field from affecting the working magnetic field and flow signal of the sensor. The flow signal line and excitation line between the sensor and the converter. However, from the analysis of the damaged parts in the lightning fault, most of the induced high voltage and surge current that caused the fault are introduced from the power line of the control room, and the other two ways are less. Since electromagnetic flowmeters have far more opportunities to measure suspended solids or dirty bodies than other flow meters, the probability of failure caused by the adhesion layer on the inner wall is relatively high. If the conductivity of the adhesion layer is similar to that of the liquid. Common faults during the commissioning period are usually caused by irregular installation.