Smoke waste heat deep utilization system of power station boiler for heating supplied water at high pressure

The invention discloses a smoke waste heat deep utilization system of a coal-fired power station boiler for heating supplied water at a high pressure, belonging to the field of energy-saving equipment using waste heat. According to the smoke waste heat deep utilization system, smoke with a temperature about 300-400 DEG C at the tail of the boiler respectively enters a high-temperature rotary type air pre-heater (2), a smoke condensed water heater (3) and a low-temperature rotary type air pre-heater (4), enters a prepositioned air pre-heater (6) after passing through a dust collector (5), and is discharged out of the system until the smoke is cooled to a temperature about 60-100 DEG C; and supplied water at the high pressure in a back-heating system is heated by using the high-temperature smoke, so that a higher energy-saving effect can be obtained. Meanwhile, the water at an inlet of the smoke feed water heater (3) can be flexibly adjusted through a pipeline design, so as to be extracted from inlets of different high-pressure heat regenerators. Therefore, when the entire smoke waste heat utilization system at the tail of the power station boiler is in various working conditions, an air side and a water feeding side are at an optimal operation working condition.