Dry Cooler For A Waste-to-Energy Plant Flue Gas Treatment

Dry Cooler for a Waste-to-Energy Plant Flue Gas Treatment

In waste incineration power plants, dry coolers play a vital role in cooling high-temperature flue gas to facilitate subsequent treatment processes.

The primary function of a dry cooler is to reduce the temperature of high-temperature flue gas. This is crucial because flue gas from waste incineration is typically hot. Lowering the flue gas temperature can prevent subsequent equipment damage, improve pollutant removal efficiency, and avoid the re-formation of harmful substances such as dioxins.

Operating Principle and Structure
Heat Transfer Principle: Dry coolers typically utilize heat exchange, with a cooling medium (such as cooling water or air) exchanging heat with the flue gas within the tubes through the tube walls. For example, in a dry quenching tower, separate flue gas and cooling medium channels are used, with heat exchange occurring through the tube walls.

Typical Structure: Some dry coolers consist of multiple quenching towers connected in series to form a single unit. Each quenching tower utilizes a coaxially arranged double-jacketed structure. The inner wall cavity serves as the flue gas channel, while the annular cavity between the inner and outer walls serves as the cooling medium channel. The flue gas channel is often finned to increase the heat exchange area and improve heat transfer efficiency.

Advantages over wet coolers
No secondary pollution: The cooling medium does not directly contact high-temperature flue gas, eliminating water contamination and eliminating the need for additional water treatment equipment.
Less clogging: Since the cooling medium does not directly contact the flue gas, pipe clogging is less likely to occur, promoting more stable system operation.
No increase in flue gas moisture: The flue gas moisture content does not increase, eliminating the need for additional demisting equipment in subsequent processes and reducing equipment costs.