Flow measurement is the science that studies the change of mass. The law of mutual change between quality and quantity is the basic law of the connection and development of things. Therefore, its measurement object is no longer limited to the traditional pipeline fluid. It is encountered wherever you need to master fluid flow. Problems with flow measurement.
Industrial production process is a large field of flow measurement and instrumentation. Flow rate, temperature, pressure and level are collectively referred to as the four major parameters in process control. People use these parameters to monitor and control the production process. The positive measurement and adjustment of the fluid flow is the basis for ensuring the safe and economic operation of the production process, improving product quality, reducing material consumption, improving economic benefits, and achieving scientific management. In the entire process testing instrument, the output value of the flow instrument accounts for about 1/5 to 1/4.
In energy measurement, a large number of flowmeters are used , such as the petroleum industry. From oil extraction, storage and transportation, refining to trade sales, any link is inseparable from flow measurement.
Now that the natural gas industry is booming, the measurement of natural gas has attracted special attention, because in the process of natural gas collection, processing, storage, transportation and distribution, millions of flowmeters are required , some of which involve The settlement amount is huge, and the requirements for measurement accuracy and reliability are particularly high. In addition, in the measurement of gas, refined oil, liquefied petroleum gas, steam, compressed air, oxygen, nitrogen, and water, a large number of flowmeters are also used, a large part of which is used for trade settlement, and the measurement accuracy needs Meet the relevant national standards, which places high requirements on flow measurement.
Energy metering flowmeters are often directly linked to the effectiveness of the enterprise, and are the basis for trade settlement, scientific management of energy, and an important means of improving economic efficiency.
In the field of environmental protection, flow measurement instruments also play an important role. In order to control atmospheric pollution, people must monitor the emissions of polluted air and other greenhouse gases; the discharge of waste liquid and sewage causes pollution of surface water and groundwater sources, and people must treat the waste liquid and sewage and discharge Volume. As a result, millions of flue gas discharge points and sewage discharge points have become the object of flow measurement.
The measurement of exhaust gas and sewage flow is more difficult. The difficulty of the flue gas is that it is dirty, dusty, corrosive, has a wide flow velocity range, an irregular flow cross section, and the length of the straight pipe section is difficult to guarantee. The difficulty of sewage is that the medium is dirty, the head is low, the caliber is large, and the flow cross section is special And non-full tube.
In the field of scientific experiments, a large variety of flow meters provide a large amount of experimental data. The flowmeters used in this field are more specific. The high temperature, high pressure, high viscosity of fluids, variable components, pulsating flow, and small flow rates are often the measurement objects to be faced.
In addition to the above-mentioned application fields, flow meters have also been widely used in modern agriculture, water conservancy construction, biological engineering, pipeline transportation, aerospace, and military fields.