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Comment Processing & Handling

Fans and Blowers

By Chemical Engineering |

Fans and blowers are common in air-handling and movement systems used in the chemical process industries (CPI). Two major uses of fans and blowers are in pneumatic conveying systems and in ventilation and air-pollution-control systems. Powering fans and blowers can contribute significantly to costs, and their efficient operation can be affected by the way plant operators select and run their systems. Included here are considerations for selecting and operating fans and blowers in dilute-phase pneumatic conveying and air-pollution control applications. Air pollution control Air-pollution control systems must protect plant workers from the process, while also meeting all emissions standards set forth in local and national regulations. The system should also seek to minimize energy costs as well as replacement costs (such as filter bags and neutralizing chemicals). The power required for an air handling system is computed using the following factors: Volumetric flowrate (Q) in ft3/min; total pressure (in. H2O); resistance due to friction in ducts, hoods and ∆P of control device; density factor of the gas being collected (df), dimensionless; and efficiency of the fan (η), dimensionless. The air power equation is the following: (1) Any…
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