Chemical industry boiler flue heat utilization system

The utility model relates to a chemical industry boiler flue heat utilization system, including heat recovery case and waste heat utilization circulation tank, the heat recovery incasement is equipped with the heat exchange tube, the top of heat recovery case is equipped with boiler flue connecting pipe and dust removal desulfurization pipe, last delivery pipe and the circulating pipe of being equipped with of waste heat utilization circulation tank, delivery pipe and circulating pipe are connected with the both ends of heat exchange tube respectively, the top of heat recovery case is equipped with the flue gas cavity that admits air, the bottom of heat recovery case is equipped with the dust and collects the cavity, the heat exchange tube setting is admitted air between cavity and the dust collection cavity at the flue gas, boiler flue connecting pipe and dust removal desulfurization pipe and the flue gas cavity intercommunication that admits air, the dust is collected the cavity and is connected dust outlet