Application of Gas Mass Flow Meter in Gas Pipeline Engineering

Application of gas mass flowmeter in gas pipeline engineering Gas pipeline engineering is more widely used now, widely used in industrial gas, petroleum, chemical industry, medical treatment, electronics and microelectronics, semiconductor, solar photovoltaic, various laboratories, research institutes , biomedicine, standard testing and other high-tech fields. Let's take a closer look at the application of gas mass flowmeters in industrial gases in gas pipeline engineering. The centralized supply mode of industrial gas pipelines has become a simple and multi-effect supply mode. However, in the gas supply of industrial pipelines, a large amount of rust impurities will be produced due to the mutual friction between the industrial gas and the pipeline and the internal corrosion of the pipeline. In addition, if the transport medium is oxygen, the oxidation of the pipeline will be accelerated. Due to the action of gas flow, the accumulation of impurities in the pipeline will affect the purity and quality of industrial gas, and also cause blockage to CNC machine tools, welding torches, cutting torches, etc. for production gas equipment, causing some failures to the equipment, thus affecting normal production. Industrial gas pipeline According to the standard classification, what flowmeter is used for gas involves the measurement of fluid flow, oil and gas industrial equipment, medical equipment, and valves. However, in the Chinese standard classification, what kind of flowmeter is used for gas involves flow and level instruments, oil and gas gathering and transportation equipment, length measurement, public medical equipment, oil drilling equipment and instruments, medical electronic equipment, extracorporeal circulation, artificial Organs, prosthetic devices. At present, most of the various types of gas flowmeters used in our daily life measure the volume flow of gas. Gas mass flowmeter has the characteristics of high precision, long life, good repeatability, wide flow range, stable and reliable, etc. The method of testing gas quality to measure gas flow is currently in the leading position in China. The working principle of the gas mass flowmeter is to use the principle of heat conduction to calculate the flow rate. There are two thermal resistance elements in the measuring section through which the gas passes, one of which detects the temperature and the other acts as a heater. These two elements and the circuit inside the flowmeter form a temperature control system that keeps the temperature value between the temperature detection element and the heater constant. As the gas flow rate increases, the greater the cooling effect, the greater the current required to maintain a constant temperature between the thermal resistors. The heat transfer is proportional to the gas mass flow rate, that is, there is a corresponding functional relationship between the supply current and the gas mass flow rate to reflect the gas flow rate. The heating power is determined by the constant temperature difference between the temperature generated by the gas flow and the constant sensor temperature. According to the law of thermal effect, the formula of heating power, temperature difference and mass flow is obtained to calculate the flow rate. In addition, since the volume of the gas will be affected by parameters such as temperature and pressure, the parameters of the medium (temperature, pressure, etc.) must be given when the volume flow rate is used to express the flow rate. If the medium parameters are constantly changing, it will cause detection distortion. Mass flow meters solve this problem. Metering is the eye of industrial production. Gas flow metering is an integral part of metering science and technology. It is closely related to national economy, national defense construction and scientific research. Doing this work well plays an important role in ensuring product quality, improving production efficiency, and promoting the development of science and technology. Especially in today's era of energy crisis and increasing automation of industrial production, the status and role of flowmeters in the national economy are more obvious.

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