The four-tower-combined indirect air cooling system puts the desulfurization absorption tower

wet electrostatic precipitator and chimney inside the indirect air cooling tower

which has advantages of saving water and energy and reducing the floor space.However

at present

the engineering applications of this technology are few and the technology is mainly applied in ultra supercritical units of 600 MW and above.Taking the supercritical 2×350 MW units as the research objects

this paper analyzes the arrangement programs of wet electrostatic precipitators of tower-in and tower outside

to obtain the feasibility of four incorporate towers in technology and economy.Moreover

the airflow field at different environmental velocities is revealed by numerical simulation

which can be used to study the heat dissipation

flue gas diffusion and inner wall corrosion of the air cooling tower.The results show that

the form of four incorporate towers is feasible in technology and the tower-in arrangement program of wet electrostatic precipitator is more economical than the tower outside mode.The airflow inside and outside the air-cooling tower is influenced by the ambient wind obviously

which dents the thermal performance of the air-cooling tower.The flue gas field inside and outside the air cooling tower is similar at different environmental wind speeds.However

when the ambient wind speed is high

the flue gas may contact with the tower body near the tower outlet

which should be managed through appropriate anti-corrosion measures.