Sintering and pelletizing machine head flue gas discharging and purifying system

The invention provides a sintering and pelletizing machine head flue gas discharging and purifying system. The system mainly comprises a water medium flue gas heat exchanger (MGGH), a desulfurizationtower, a flue gas condenser, a rotary flue gas heat exchanger (GGH), a flue burner/hot blast heater, an ammonia water vaporizer, a denitrification device, a booster fan and a chimney. The system adopts ammonia process desulfurization and selective catalytic reduction denitration (SCR) technologies to achieve the purposes of ultralow emission of sulfur dioxide, nitrogen oxides and particulate matters and removal of water in flue gas. The system has the following advantages: an ultrasonic cyclone atomization technology is used to improve the ammonia process desulfurization effect; a water washing purification section and a flue gas condensation technology are adopted to reduce the temperature and the particulate matter content of desulfurized outlet flue gas, reduce the water carrying volumeof the flue gas and reduc