Bypass of waste heat recovery preheating of air economizes coal measures all

The utility model relates to a bypass of waste heat recovery preheating of air economizes coal measures all, the exhaust outlet of boiler connect cyclone's air inlet, and heat exchanger's heat pipe is connected to cyclone's gas outlet, and cyclone's exit is equipped with the heat pipe series connection that pressure relief device, pressure relief device and heat exchanger are connected to the branch road, heat exchanger's heat pipe exit linkage electrostatic precipitator's air inlet, electrostatic precipitator's gas outlet play is equipped with the second fan, and the gaseous effluent cooler is connected to the gas outlet of second fan, and the gaseous effluent cooler upper end is equipped with two circulation blow vents, and circulation gas outlet exit is equipped with the aspiration pump, and the second pre -heater is connected to the other end of aspiration pump, and the air inlet of first pre -heater is connected to the gas outlet of second pre -heater, and the circulation air inlet of gaseous effluent cooler is got back to to the gas outlet of first pre -heater, the utility model relates to a rationally, easy operation is convenient, and preheats rate of recovery height, and the running cost is low, and is energy -concerving and environment -protective, pollution -free to the air.