Flow measurement technology and instrumentation applications

First, the industrial production process flowmeter is one of the major instruments in process automation instrumentation and devices. It is widely used in metallurgy, electric power, coal, chemical industry, petroleum, transportation, construction, textile, food, medicine, agriculture, Various areas of national economy such as environmental protection and people’s daily life are important tools for the development of industrial and agricultural production, energy conservation, improvement of product quality, and improvement of economic efficiency and management level. They play an important role in the national economy. In the process automation instrument and device, the flow meter has two major functions: as the total amount of the instrumentation of the process automation control system and the measurement of the quantity of the material.
Second, energy measurement energy is divided into primary energy (coal, crude oil, coal bed methane, petroleum gas and natural gas), secondary energy (power, coke, artificial gas, refined oil, liquefied petroleum gas, steam) and energy-carrying working fluid (compression Air, oxygen, nitrogen, hydrogen, water, etc. Energy measurement is an important means of scientifically managing energy, realizing energy saving and consumption reduction, and improving economic efficiency. Flow meters are an important part of energy metering devices. The commonly used energy sources such as water, artificial gas, natural gas, steam, and oil products use a very large number of flow meters, which are indispensable tools for energy management and economic accounting.
III. Environmental Protection Engineering The emissions of flue gas, waste liquids, and sewage seriously pollute the atmosphere and water resources, seriously threatening the human living environment. The country regards sustainable development as a national policy, and environmental protection will be the biggest issue in the 21st century. Air and water pollution must be controlled and management must be strengthened. The basis of management is the quantitative control of pollution.
China is a country with coal as its main energy source. There are millions of chimneys in the country that continuously emit smoke to the atmosphere. Flue gas emission control is an important project to eradicate pollution. Each chimney must be equipped with flue gas analysis instruments and flow meters to form a continuous emission monitoring system. The flow rate of the flue gas is very difficult. Its difficulty is that the chimney is large in size and irregular in shape, the gas composition changes indefinitely, the flow velocity range is large, dirt, dust, corrosion, high temperature, and no straight pipe sections.
Fourth, there are five ways of transportation: railway and highway, aviation, water transportation, and pipeline transportation. Although pipeline transportation has already existed for a long time, its application is not widespread. With the outstanding environmental protection issues, the characteristics of pipeline transportation have attracted people's attention. Pipeline transportation must be equipped with a flowmeter, which is the eye of control, distribution and dispatch, and an essential tool for safety monitoring and economic accounting.
V. Biotechnology The 21st century will usher in the century of life sciences. The industry characterized by biotechnology will develop rapidly. There are many substances that need to be measured and measured in biotechnology, such as blood and urine. Instrument development is extremely difficult and varied.
Sixth, science experiment The flow meter that science experiment needs not only quantity is numerous, and the variety is very complicated. According to the statistics, more than 100 kinds of flowmeters are required for scientific research. They are not mass-produced and are sold on the market. Many scientific research institutions and large companies have special teams to develop special flowmeters.
VII. Marine Meteorology, Rivers and Lakes These areas are open flow passages. Generally, it is necessary to measure the flow velocity and then calculate the flow rate. The physical principle and fluid mechanics basis on which the flow meter and the flow meter are based are common, but the principle and structure of the meter and the conditions of use are very different.