According to the circulating
water cooling system of the thermal power
plant, the cooling
system of the first unit communicates with the cooling
system of the second unit by arranging the hot circulating water connecting
pipe and the cold circulating water connecting
pipe, and the cooling system is controlled to be switched between a one-
machine-one-
tower mode and a two-
machine-one-
tower mode through the first valve and the second valve; the requirement for unit cooling can be met when the boiler unit is in
high load, and the energy-saving and anti-freezing purposes of the unit can be achieved when the boiler unit is in low temperature and in
low load. According to the system, the cooling task of the boiler unit under different loads can be effectively completed and guaranteed, and the system has the advantages of being easy to control and convenient to switch. In addition, the two indirect cooling towers are arranged, one indirect
cooling tower is used, the other indirect
cooling tower is standby, and the two indirect cooling towers can be alternately used and can also be independently used when the boiler
unit load is large, so that the requirements of different working conditions can be met.