Gravel circulation dry electrostatic precipitator

A gravel circulation dry electrostatic precipitator comprising:

• a drying unit (S1) configured to convey a recycled aggregate, which contains a large amount of moisture, among materials of asphalt-concrete (ascon) by using a bucket elevator (100) to uniformly mix, heat, and dry the aggregate;
• a first dust collection and purification unit (S2) configured to forcibly suction odor-inducing substances, harmful gases, and dust, which are generated in the drying unit (S1), through a pipe provided on an upper side to collect and purify the odor-inducing substances, the harmful gases, and the dust;
• a second dust collection and purification unit (S3) in which fine dust, remaining after the odor-inducing substances, the harmful gases, and the dust that have passed through the first dust collection and purification unit (S2) are filtered by a filter, is discharged to the outside by a screw (S) provided at a lower end of a hopper;
• and
• a discharge unit (S4) configured to forcibly suction fresh air, which has passed through the second dust collection and purification unit (S3), by using a turbo fan (F) to discharge the fresh air through an outlet (400),
• wherein the first dust collection and purification unit (S2) comprises:
• a gravel accommodation part (20) comprising an inlet (200) on one side thereof and a blower fan (201) on the other side, and having an inner circumferential wall surface on which gravel is accommodated;
• a gravel collecting part (21) disposed on a lower end of the gravel accommodation part (20) and comprising a discharge valve (210) through which the gravel is replaced;
• a corona reaction part (22) provided at a center of an upper inner circumferential portion of the first dust collection and purification unit;
• and
• an outflow part (23) which is disposed on one side of the gravel accommodation part (20) and through which the purified air flows out,
• wherein the corona reaction part (22) comprises:
• a dust collector (220) in which a plurality of dust collecting pipes (221) are accommodated;
• and
• a discharge unit (260) comprising a discharge rod (230) accommodated inside each of the dust collecting pipes (221) of the dust collector (220), discharge tips (240) coupled to a front end of the discharge rod (230) so as to be spaced a constant distance from each other, and a high-voltage applying device (250) configured to apply a voltage to an end of the discharge rod (230),
• wherein a fixing groove (231) is defined in the discharge rod (230) so that each of fixing rings (232) is fixed to the fixing groove (231), the discharge tip (240) is seated between the fixing rings (232) so that the discharge tip (240) is inserted into the discharge rod (230) so as to be fixed, and the discharge tip (240) is provided in four to be installed to be spaced 75 mm from each other starting from a front end of the discharge rod (230),
• wherein, in the discharge tip (240), a through-hole (241) into which the discharge rod (230) is inserted passes through the discharge tip (240), an outside of the discharge tip (240) has a sawtooth shape comprising a sawtooth ridge (242) and a sawtooth trough (243), each of the sawtooth ridge (242) and the sawtooth trough (243) is provided in twelve to be at constant intervals, the sawtooth ridge (242) has a diameter of 16 mm, the sawtooth trough (243) has a diameter of 11 mm, the discharge tip (240) has a whole thickness of 0.8 mm, and auxiliary through-holes (244) are defined in the through-hole (241) to extend to the outside, and are spaced a predetermined distance from each other.