Common faults, installation and maintenance of mass flowmeters

Application characteristics of gas mass flowmeter in flue gas measurement system The wide applicability of gas mass flowmeter makes it widely praised by customers, and has its advantages in many fields. Today, let's talk about the specific application of gas mass flowmeters in flue gas measurement systems. Application background of gas mass flowmeter in flue gas measurement system Applied in most flue gas measurement systems (CEMS systems) of thermal power plants and power plants, the difficulties and problems faced by the flow measurement process analysis mainly include: high temperature, high dust, High moisture, negative pressure and corrosiveness, etc. The working conditions are usually: the temperature of the flue gas medium is about 150°C, the primary or secondary air of the thermal power plant is generally at 200°C, but some of them are also at about 400°C, and the flow rate is generally around 30m/s; the accuracy is generally required to be 1 % or so; dust particles 0~1000mg/m3; pressure measurement range: -70~70mbar. Under such conditions, the necessary detection accuracy and fast response speed should be guaranteed; easy to install and calibrate; meet the protection requirements of dustproof, splashproof, anticorrosion, etc.; there should be a high degree of automation and less maintenance workload. For these problems, we usually have two instruments to choose from: Pitot tube or thermal gas mass flow meter. Let's talk about the application characteristics of thermal gas mass flowmeters. The gas mass flowmeter is an instrument that uses the principle of heat conduction to detect the flow rate, that is, the heat exchange relationship between the flowing fluid and the heat source is used to measure the flow rate: the expression is: P/ΔT=A+B(Q)m, where: A , B is a constant related to the physical properties of the gas. It can be seen from the formula that the mass flow Q can be obtained from the ratio of the heating power to the temperature difference of the heat source. In practical applications, we fix any parameter of heating power or temperature difference to measure the quality of the fluid. The former is the constant power method; the latter is the constant temperature difference method. The gas mass flowmeter adopts computer-aided manufacturing technology, wide range ratio, large diameter, low flow rate, and low pressure drop. Mass flow measurement does not require temperature and pressure compensation, and low flow rate measurement is very sensitive. In the CEMS system, thermal gas mass flowmeters are generally used abroad. Because of its high precision, convenient installation, convenient operation, and strong corrosion resistance, it is a leading instrument in the industry. In China, due to lack of understanding of thermal mass flowmeters and price factors, the application of thermal mass flowmeters in CEMS systems is not popular. Among many system integrators, because the medium composition in the CEMS system is relatively harsh, there are often particles, dust, moisture and corrosive components, which are easy to be in the sensing part (the probe part of the thermal flowmeter, the pitot tube in the static pressure, dynamic part of the pressure) to form a blockage, resulting in inaccurate measurement, or even impossible measurement. The gas mass flowmeter we recommend can overcome the above shortcomings. For thermal gas mass flowmeters, during normal measurement, the probe is stretched out, which is the same as the normal thermal flowmeter measurement method; when sweeping, the probe is extended/retracted, and the surface of the probe is realized by using the sweeping block. Dirt cleaning. Features: Does not affect the measurement results. The instrument regularly controls the solenoid valve, the solenoid valve controls the air source with a certain pressure, and the air source controls the pneumatic device, which moves up and down (or left and right) to drive the scraping block, so as to clean the sensing part of the thermal mass flowmeter - the probe. Purpose. For thermal gas mass flowmeters, during normal measurement, the gas source does not supply gas, and no purge is performed; during purge, the gas is blown directly to the probe through the nozzle, and no measurement is performed at this time. Features: light weight; easy maintenance; negligible impact on measurement results. The thermal gas mass flowmeter not only has all the characteristics of the thermal flowmeter, but also realizes the functions of measuring, sweeping and anti-corrosion, and is deeply loved and trusted by customers.

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