What is the role of fans in industrial flue gas purification processes?

Flue gas emitted from metallurgical, steel, coking, petrochemical, fertilizer, and power generation plants is a significant source of air pollution, harming human health and plant growth.

Therefore, purifying industrial flue gas is a crucial measure for controlling air pollution. There are three main methods for gas purification: absorption, adsorption, and catalysis.
Each method has different purification processes depending on the properties of the gas. In all these flue gas purification processes, fans are needed to transport the unpurified flue gas and to deliver the purified flue gas to the chimney for release into the atmosphere.