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1. How to accurately calculate the air flow rate of the blast furnace blower
Accurately calculating the air flow rate of the blast furnace blower can be divided into two types: direct measurement method and indirect calculation method. The appropriate solution can be selected according to the site conditions and accuracy requirements. 1. Direct measurement method obtains data directly by installing a dedicated flow measurement device. The commonly used equipment and operation are as follows: • Orifice flowmeter: Install an orifice plate in the air supply duct. When air flows through the orifice plate, a front rear pressure difference will be generated. Combining Bernoulli equation, orifice plate aperture, pipe diameter, air density, and measured pressure difference, the air flow front shock can be calculated. It is important to avoid interference from silver burning vortex when installing the orifice plate. Venturi flowmeter: The principle is similar to orifice flowmeter, but the fluid resistance is smaller and the measurement accuracy is higher. By measuring the pressure difference between the contraction and expansion sections of the Venturi tube, combined with the geometric parameters of the tube body, the flow rate is calculated, which is suitable for scenarios with high pressure loss requirements. • Vortex flowmeter: Using the principle of fluid vibration, alternating vortices are generated when air flows through a blocking fluid. The vortex frequency is proportional to the airflow velocity. By detecting the vortex frequency and combining it with the cross-sectional area of the pipeline, the air flow rate can be calculated, which is suitable for working conditions with pulsating airflow.
2. Indirect
3. Key considerations • Measurement environment optimization: Flow measurement points should be selected in straight pipe sections with stable airflow, away from components such as elbows and valves that are prone to eddy currents. At the same time, the air density parameters should be corrected according to the on-site environmental temperature and pressure to avoid affecting the calculation accuracy. Regular calibration of equipment: When using direct measurement method, it is necessary to regularly compare and calibrate the measuring equipment with a standard flow device to ensure the accuracy o