Dryer fan selection method

In actual production, fan selection in the dryer industry involves the following scenarios:

1) Selecting the appropriate fan model for a new drying project: This primarily involves determining the fan's mass flow rate and total pressure head based on the drying system's production capacity and resistance. For a single-induced draft fan system, the fan's total pressure should be greater than the system resistance. For a dual-induced draft fan system, the sum of the two fans' total pressures should be greater than the system resistance. Fan selection is generally based on fan curves to determine which model best meets the drying system's operating conditions and maximizes fan efficiency.

2) For existing drying systems, a fan modification plan may be determined due to factors such as increased production. This typically involves determining the air volume variation range based on actual production needs, and then deciding on the fan modification plan.

3) Verifying fan capacity when operating conditions change: When the air temperature at the dryer fan fluctuates, especially when the actual temperature is significantly lower than the design temperature, the motor may overload and, in severe cases, burn out.