In the gas-gas heater (GGH) of limestone/gypsum wet flue gas desulphurization system for boilers in thermal power plants

the heat transfer elements adopting L-wave shaped sidewalk can improve the blockage events easily occurred in GGH

in addition

the heat transfer elements in GGH being cleaned by using high-pressure water with chemical agent

as well as being blown by using steam with high kinetic energy and high heat energy to replace the compressed-air are also effective measures for cleaning the heat transfer elements.After cleaning

the pressure difference in GGH can be recovered to about 400 Pa in the case of full load operation for unit.