Power station machine furnace integrated cold end comprehensive optimization system

The invention discloses a power station machine furnace integrated cold end comprehensive optimization system which belongs to the field of power station energy saving. The system mainly comprises a steam turbine, a main economizer, a main flue, a bypass flue, a convergence flue, a main air pre-heater, smoke-water heat exchangers, a high pressure heater, a low pressure heater, a deaerator, a smoke-air heater and steam extraction condensed air pre-heaters. Multi-stages of the steam extraction condensed air pre-heaters are serially arranged, sequentially extract a part of exhaust steam of the steam turbine and corresponding low-pressure-stage extraction steam and preheat cold air stage by stage; and the first, second and third stage smoke-water heat exchangers are used for heating feeding water and condensed water, and high-pressure extraction steam of the steam turbine is replaced. According to the machine furnace integrated cold end comprehensive optimization system, by means of efficient waste-heat utilization, low-pressure extraction steam is used for heating air, and the high-pressure extraction steam for backheating is saved so that unit output power is obviously increased, deep energy saving and consumption reduction of the coal-fired power generation unit are achieved, the problem of low-temperature corrosion on a heated surface during waste-heat utilization is solved, and economical benefits are remarkable.