The invention provides a
coal-fired
power generation system based on a bypass
flue at the
tail part of a boiler as well as warm air obtained through steam extraction. The
coal-fired
power generation system adopts fuel to heat feed water so as to generate power, and is characterized by comprising a boiler body subsystem, an air supply subsystem, a
tail flue subsystem, a turboset subsystem and a generator, wherein the boiler body subsystem comprises the boiler and a boiler
flue, the boiler is provided with a
hearth, and the boiler flue is connected with an outlet of the
hearth and divided into a main flue and the bypass flue; the air supply subsystem comprises an air feeder, a front
air preheater and a flue
air preheater, the air feeder is used for supplying environment
cold air, the front
air preheater is connected with the air feeder and used for preheating the environment
cold air to obtain warm air, and the flue air preheater is arranged in the main flue and used for heating the warm air; the
tail flue subsystem comprises a high-pressure feed water
heat exchanger and a low-pressure
condensed water heat exchanger, the high-pressure feed water
heat exchanger is arranged in the bypass flue and close to an inlet of the bypass flue, and the low-pressure
condensed water heat exchanger is arranged in the bypass flue and close to an outlet of the bypass flue.