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What are the rankings of ultrasonic flowmeter manufacturers? There is actually no ranking, and many manufacturers of ultrasonic flow meters are not among them. This shows that many sales oriented companies have become production-oriented, so ranking is a means used by some online companies. Ultrasonic flow meters, like electromagnetic flow meters, are unobstructed flow meters due to the absence of any obstruction in the instrument flow channel. They are a type of flow meter suitable for solving difficult flow measurement problems, especially in large-diameter flow measurement, and have outstanding advantages. They are one of the rapidly developing types of flow meters. Signal detection principle: According to the principle of signal detection, ultrasonic flowmeters can be divided into propagation velocity difference method (direct time difference method, time difference method, phase difference method, and frequency difference method), beam offset method, Doppler method, cross-correlation method, spatial filtering method, and noise method. 2. What type of analytical instruments are required for the side blowing waste heat boiler?
The side blowing waste heat boiler needs to be equipped with corresponding functional analytical instruments according to its operational monitoring requirements, covering four major monitoring scenarios: flue gas, water quality, fuel, and operating parameters.
Smoke composition analysis instruments are used to monitor the combustion efficiency, corrosion risk, and pollutant emissions of exhaust gas from waste heat boilers. They are the core configuration of side blowing waste heat boilers. High temperature smoke analyzers can monitor O ₂, CO, NO ₓ, SO ₂, and dust concentrations online. Some models support direct measurement of high temperatures above 1000 ℃ without sampling pretreatment, and are suitable for high smoke temperature conditions of side blowing boilers. Explosion proof types are recommended (if the boiler is in a flammable and explosive environment). Smoke humidity meter: monitors the moisture content of smoke exhaust and assists in determining the risk of low-temperature corrosion. It is recommended to use capacitive or resistive capacitive online monitoring devices. • Smoke flow/velocity monitoring instrument: used to calculate the total amount of waste heat recovery, often using a combination of pitot tube and differential pressure transmitter, or an integrated ultrasonic smoke flow meter. Online pH meter: monitors the acidity and alkalinity of the boiler water to prevent alkaline or acidic corrosion. Online hardness analyzer: monitors the concentration of calcium and magnesium ions in the feedwater to prevent scaling. Dissolved oxygen analyzer: monitors the dissolved oxygen content in the feedwater to prevent oxygen corrosion of the boiler body. • Total phosphorus/total alkalinity analyzer: Some boilers that use chemical treatment require online monitoring of chemical concentration adaptability.3. Fuel/combustion condition auxiliary analysis instrument. Side blowing boilers are often used in conjunction with side blowing smelting processes such as blast furnaces and converters, and fuel characteristic monitoring is required. • Fuel calorific value analyzer: If variable calorific value fuels such as coal gas and biomass are used, the low-level calorific value of the fuel can be monitored online to assist in adjusting the combustion ratio. Furnace temperature monito