Application and Performance Testing Methods for Cabinet-Type Centrifugal Exhaust Fans

Application and Performance Testing Methods for Cabinet-Type Centrifugal Exhaust Fans

Cabinet-type centrifugal exhaust fans are widely used in industrial production. They represent a common type of cabinet-type centrifugal exhaust fan. These fans can be used in forging furnaces and for high-pressure forced ventilation. They are widely used for transporting air and other non-flammable substances. They are harmless to humans and do not affect steel. Applications include high-pressure gas supply in the steel, chemical, and carbon black industries; sulfur recovery in the petroleum refining industry; desulfurization in power plants; ore flotation; extraction of corrosive gases such as landfill gas; process gas lifting; fluidized bed incineration; air compression for pneumatic tools; vacuum applications; and aeration for municipal or industrial wastewater treatment. Before selecting a cabinet-type centrifugal exhaust fan, one should understand the types and specifications of such fans, the specific purposes of various products, new product development, and sales promotion. Additionally, the manufacturing and product quality of cabinet-type centrifugal exhaust fans must be considered. Furthermore, environmental protection requirements must be fully taken into account. To select the appropriate cabinet-type centrifugal exhaust fan, one can choose based on the various physical and chemical characteristics of the gases being transported and the specific application requirements. For applications such as coal crushing or coal powder transportation, dust extraction fans must be selected. When transporting corrosive gases, cabinet-type centrifugal exhaust fans must be used. High-temperature cabinet-type centrifugal exhaust fans are required for operation in high-temperature environments or for transporting high-temperature gases. Taking a specific type of motor as an example, this type of cabinet-type centrifugal exhaust fan is equipped with nozzles at both the inlet and outlet. Field performance is tested using the displacement method. Specifically, field conditions including the dry-bulb temperature at plane 2a are first recorded. The dry-bulb temperatures at planes 2a and 3b, and the temperature at plane 1b are 1.3°C, 0.66°C, and 34°C, respectively. The speed of the first-stage cabinet-type centrifugal exhaust fan is 1678 rpm, and the speed of the second-stage cabinet-type centrifugal exhaust fan is 1670 rpm. The specified density is 0.7218 kg/m³. Next, the motor data is measured. The voltage of the first-stage motor is measured at 4020, 4030, and 4050 V, and the current of the first-stage motor is measured at 43.5, 44, and 45 A. The data for the second stage is recorded. Using the same method as for the motor nameplate data—which includes the motor input for the first stage—the cabinet-type centrifugal exhaust fan and motor must be directly connected for the six items: power, rated power, and rated voltage. The motor efficiency data is provided by the motor manufacturer. Convert the data for the flat and cabinet-type centrifugal exhaust fans to obtain the static pressure, airflow rate, and fan shaft output for both units.