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1. Unit of thermal gas flowmeter
The unit of thermal gas flowmeter mainly depends on the measurement principle and display settings, usually in volume flow units or mass flow units. 1. Absolute flow rate unit • cubic meter/hour (m ³/h): The most commonly used unit of volumetric flow rate, suitable for industrial process control. • liters per minute (L/min): commonly used in small pipelines or laboratory environments. • Standard cubic meter per hour (Nm ³/h): Refers to the volumetric flow rate of gas at standard conditions (0 ° C, 101.325kPa), used for trade settlement and energy consumption measurement
2. Mass flow unit • Kilogram per hour (kg/h): A unit for directly measuring gas mass flow rate, with high accuracy and not affected by temperature and pressure. • Ton/hour (t/h): Used for high flow gas measurement, such as power plant flue gas monitoring
3. Other commonly used units • Foot ³/minute (CFM): British unit, commonly used in ventilation systems in North America. • Gallons per minute (GPM): mainly used for liquid measurement, but some gas flow meters can also switch display
4. Unit conversion and setting - Contemporary thermal flow meters usually support multi unit switching and need to be set in the instrument menu. -If the display unit is SCFM (standard cubic feet per minute) or SLPM (standard liters per minute), it means that it has been automatically compensated to the standard state. -Attention: The volumetric flow rate in non-standard conditions can only be converted to accurate values by compensating with temperature/pressure sensors
5. Selection and usage precautions - For industrial sites, Nm ³/h or kg/h should be preferred to avoid measurement deviation caused by tempe
2. Coal powder and dust concentration monitor
3. How to measure the flue gas flow rate of a rotary kiln with a diameter of 4.8 meters and a length of 74 meters
4 methods and operation points for measuring the flue gas flow rate of a rotary kiln
1. Pitot tube measurement method • Principle: Calculate the flow rate by dynamic/static pressure difference, and combine it with the cross-sectional area of the pipeline to obtain the flow rate • Key parameters: Measure the cross-sectional area of the pipeline with a diameter of 4.8 meters (18.1 square meters), and the recommended distance between measuring points is 0.8-1 meters • Installation requirements: The distance between the opening position and the elbow should be ≥ 5 times the pipe diameter, and the insertion depth should be 1/3 Thermal gas mass flowmeter • Applicable conditions: flue gas temperature ≤ 650 ℃, dust content ＜ 50g/m ³ • Typical model: Sierra 780S series (range 0-50m/s, accuracy ± 1% reading) • Installation note: Vertical installation is required, probe length needs to match 4.8-meter pipe diameter 3 Ultrasonic flowmeter • Selection requirements: Wall thickness ≤ 50mm, recommended dual channel model (such as FLEXIM FLUXUS G721) • Measurement accuracy: ± 1.5% reading (when flow rate>1m/s) • Advantages: Can measure a wide range of flow rates from 0.01-60m/s. 4 Venturi tube • Des
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