The fouling deposition on surface of the heat exchanger can tremendously reduce the heat transfer efficiency of said exchanger

hence

it is very important to diagnose the causes of fouling formation.Combined with the actual example in one power plant

many analyses

such as water quality analysis

ignition analysis

plasma transmitted spectrum

and scanning electron microscopy etc.

have been carried out

to analyse the quality of cooling water

and properties in aspects of fouling

silt

and microorganism respectively.The results show that the silt carried in cooling water of the said plant is the main cause of fouling formation on the surface of heat exchanger in cooling water system.Hence

it is recommended as in the foollowing:(1) the silt should be regarded as a special item in daily quality monitoring process of the direct discharging type cooling water system;(2) the cooling water intake port should be kept enough distance from the bottom of water supply reservoir.