Search

EP-4397391-B1 - TREATMENT DEVICE FOR EXHAUST GAS FROM RARE EARTH CALCINATION

EP4397391B1EP 4397391 B1EP4397391 B1EP 4397391B1EP-4397391-B1

Inventors

  • TIAN, Hao
  • GUO, Jincheng
  • HOU, SHAOCHUN
  • XU, HUI
  • LI, ERDOU
  • SONG, JING

Dates

Publication Date
20260506
Application Date
20230322

Claims (7)

  1. A treatment device for an exhaust gas from rare earth calcination, characterized in that comprising a spray apparatus (1) in which a sprayer (14) is arranged; the sprayer (14) comprising an input pipe (141), a nozzle (142), a toothed ring (143), a rotating impeller (144), a first gear (145), a second gear (146), and a connection pipe (147); wherein the input pipe (141) is configured to input a spray liquid to the nozzle (142); wherein the nozzle (142) is arranged to be more than one, rotatably connected to the input pipe (141) by the connection pipe (147), arranged in a ring shape, and configured to be able to spray the spray liquid into the spray apparatus (1); wherein the first gear (145) is connected to a periphery of the nozzle (142); wherein the toothed ring (143) is arranged below the input pipe (141) and arranged on a periphery of a ring formed by the nozzles (142); inner-ring teeth that mesh with the first gear (145) are provided on an inner side of the toothed ring (143); and meshing teeth are provided on a surface of the toothed ring (143) that is away from the input pipe (141); wherein the rotating impeller (144) is arranged below the toothed ring (143) and configured to drive the second gear (146) to rotate; and wherein the second gear (146) is connected to the rotating impeller (144), meshes with the meshing teeth, and is configured to drive the toothed ring (143) to rotate; and the treatment device further comprises a liquid suction assembly (3) that comprises a slide cylinder (31), a slide rod (32), and a liquid suction pipe (33); wherein one end of the liquid suction pipe (33) is connected to the input pipe (141), and the other end of the liquid suction pipe (33) is provided with a liquid inlet (332); at least a part of the liquid suction pipe (33) is made of a flexible material; and the liquid suction pipe (33) is configured to be able to deliver the spray liquid to the input pipe (141); wherein one end of the slide rod (32) is connected to one end of the liquid suction pipe (33) that is provided with the liquid inlet (332); and wherein the slide cylinder (31) is filled with a thermally expandable material, the slide cylinder (31) is connected to one end of the slide rod (32) that is away from the liquid suction pipe (33), and the thermally expandable material is configured to be able to control, by a volume change thereof, stretching out and drawing back of the slide rod (32); and the treatment device further comprises a liquid storage apparatus (2); wherein the liquid storage apparatus (2) is arranged below the spray apparatus (1) and the liquid storage apparatus (2) is provided with an opening on its top, the slide cylinder is fixed in the liquid storage apparatus (2), and the liquid storage apparatus (2) is configured to be able to store the spray liquid; and the treatment device further comprises a dust removal assembly (4) that comprises a first transmission shaft (41), a second transmission shaft (42), and a dust removal fabric (43); wherein the first transmission shaft (41) is arranged above an edge A of the opening of the liquid storage apparatus (2); wherein the second transmission shaft (42) is arranged above an edge B of the opening of the liquid storage apparatus (2), the edge A and the edge B facing each other; wherein the first transmission shaft (41) and the second transmission shaft (42) are configured to be able to support the dust removal fabric (43) and drive the dust removal fabric (43) to move; wherein the dust removal fabric (43) comprises a first part, a second part, a third part, and a fourth part that are sequentially connected; the first part covering at least a part of the first transmission shaft (41); the second part covering at least a part of an inner surface of a side wall of the liquid storage apparatus (2) that is close to the first transmission shaft (41), at least a part of an inner surface of the bottom of the liquid storage apparatus (2), and at least a part of an inner surface of a side wall of the liquid storage apparatus (2) that is close to the second transmission shaft (42); the third part covering at least a part of the second transmission shaft (42); and the fourth part covering at least a part of an outer surface of a side wall of the liquid storage apparatus (2) that is close to the first transmission shaft (41), at least a part of an outer surface of the bottom of the liquid storage apparatus (2), and at least a part of an outer surface of a side wall of the liquid storage apparatus (2) that is close to the second transmission shaft (42); and wherein the dust removal fabric (43) is configured to be able to remove dust in the spray liquid in the liquid storage apparatus (2).
  2. The treatment device according to claim 1, characterized in that a turbulence blade (1421) is attached to an outer surface of the nozzle (142).
  3. The treatment device according to claim 2, characterized in that the nozzle (142) has a liquid outlet opened downwards, and that the turbulence blade (1421) is at least two, and the turbulence blades (1421) are dispersedly arranged near the liquid outlet.
  4. The treatment device according to claim 1, characterized in that the liquid suction pipe (33) is provided with a water pump (331).
  5. The treatment device according to claim 1, characterized in that a lower part of the spray apparatus (1) is provided with an exhaust gas inlet (11) that is configured to enable the exhaust gas to be treated to enter the spray apparatus (1); wherein a top part of the spray apparatus (1) is provided with an exhaust gas outlet (12) that is configured to enable the exhaust gas that has come into contact with the spray liquid to be discharged from the spray apparatus (1); and wherein a bottom part of the spray apparatus (1) is provided with a spray liquid outlet (13) that is configured to enable the spray liquid that has come into contact with the exhaust gas to be discharged from the spray apparatus (1).
  6. The treatment device according to claim 1, characterized in that the dust removal assembly (4) further comprises a wiping roller (44) and a drive motor (46), Wherein the wiping roller (44) is arranged on the bottom of the liquid storage apparatus (2) and comes into contact with a surface of the dust removal fabric (43) that is away from the liquid storage apparatus (2), and the wiping roller (44) is configured to be able to remove dust on the dust removal fabric (43); and wherein the drive motor (46) is connected to the first transmission shaft (41), and connected to the wiping roller (44) by means of a transmission member (45).
  7. The treatment device according to claim 1, characterized in that a surface of the dust removal fabric (43) that is away from the liquid storage apparatus (2) is provided with a flexible protrusion (431) that is configured to be able to intercept dust in the spray liquid.

Description

TECHNICAL FIELD OF THE DISCLOSURE The present disclosure relates to a treatment device for an exhaust gas from rare earth calcination as specified in any of claims 1-7. BACKGROUND OF THE DISCLOSURE Rare earth calcination is the process of thermally decomposing rare earth salts into rare earth oxides at high temperatures. The exhaust gas generated by the thermal decomposition reaction needs to be filtered by means of a bag filter before being discharged, with a view to improving the product yield and reducing the concentration of particulate substances in the flue gas; and be subjected to spray treatment by spray equipment with a view to avoiding heat energy loss caused by the otherwise direct discharge of the high-temperature gas and further purifying the exhaust gas. CN215506204U discloses a treatment device for an exhaust gas from rare earth calcination. The treatment device comprises an exhaust gas cooling box, a dust filtration box, a spray sorption box, and a neutralization adjustment box. A nozzle capable of rotating transversely is provided in the spray sorption box. A water outlet is provided on the nozzle, and the two ends of the nozzle are connected to a drive motor and a water supply pump, respectively. CN208541954U discloses a spray tower for an exhaust gas from rare earth processing furnace. The spray tower comprises a spray tower body. A vent is provided on the top of the spray tower body, and a drain pipe is provided on its bottom. Multiple groups of bow-shaped sieve plates are provided respectively on the left and right inner walls of the spray tower that are located between the nozzle and the gas inlet pipe. The bottom of the spray tower is provided with a liquid discharge pipe, and one end of the liquid discharge pipe is connected to a backwash water pump. The feed end of the gas inlet pipe that is located outside the spray tower is bent upwards, and the discharge part of the gas inlet pipe that is located inside the spray tower is obliquely provided with a cut. CN205517150U discloses a treatment device for an exhaust gas from rare earth metal electrolysis. The treatment device comprises an electrolytic furnace, a spiral nozzle, and a spray head. The exhaust gas outlet of the electrolytic furnace is connected to the gas inlet of the cyclone separator by means of a pipe, and the gas outlet of the cyclone separator is connected to the gas inlet of the sorption tower by means of a pipe. A solid particle collection box is connected to the lower part of the cyclone separator. The spiral nozzle is fixed to the inside of the sorption tower by means of a connector. The spray head is mounted on the spiral nozzle. The right side of the sorption tower is provided with a neutralization liquid tank. The spiral nozzle, the pump body, and the neutralization liquid tank are connected successively by means of a pipe. The upper part of the sorption tower is connected to the discharge pipe, and the bottom part thereof is connected to the waste liquid tank by means of a pipe. CN 112 973 341 A, CN 115 400 576 A and CN 107 803 110 A also disclose several gas treatment devices employing spraying systems. In the devices described above, the exhaust gas cannot come into sufficiently uniform contact with the spray liquid in the spray apparatus, which results in the failure to achieve a good treatment effect. SUMMARY OF THE DISCLOSURE In view of the above, the present disclosure is intended to provide a treatment device for an exhaust gas from rare earth calcination as specified in any of claims 1-7 that enables more uniform contact between the exhaust gas and a spray liquid and thereby achieves an improved treatment effect. Further, the treatment device can prevent dust in the recycled spray liquid from clogging some apparatus. Furthermore, the treatment device can decrease the amount of dust in the recycled spray liquid. The above objectives are accomplished by technical solutions described below. The present disclosure provides a treatment device for an exhaust gas from rare earth calcination as specified in any of claims 1-7, comprising a spray apparatus in which a sprayer is arranged; the sprayer comprising an input pipe, a nozzle, a toothed ring, a rotating impeller, a first gear, a second gear, and a connection pipe;wherein the input pipe is configured to input a spray liquid to the nozzle;wherein the nozzle is arranged to be more than one, rotatably connected to the input pipe by the connection pipe, arranged in a ring shape, and configured to be able to spray the spray liquid into the spray apparatus;wherein the first gear is connected to a periphery of the nozzle;wherein the toothed ring is arranged below the input pipe and arranged on a periphery of a ring formed by the nozzles; inner-ring teeth that mesh with the first gear are provided on an inner side of the toothed ring; and meshing teeth are provided on a surface of the toothed ring that is away from the input pipe;wherein the rotating impeller is ar