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CN-122006351-A - Blast furnace ironmaking dust removal device and working method

CN122006351ACN 122006351 ACN122006351 ACN 122006351ACN-122006351-A

Abstract

The invention discloses a blast furnace ironmaking dust removing device and a working method, which belong to the field of gas pollution treatment and comprise a shell, a baffle plate fixed on the inner wall of the shell, a filter bag fixed at the lower end of the baffle plate, an inlet and an outlet which are respectively arranged at two sides of the shell, an air supply unit fixed at one side of the shell, and a blowback assembly positioned in the shell, wherein the output end of the air supply unit is connected with the input end of the blowback assembly through a pipeline, the blowback end of the blowback assembly stretches into the filter bag, the blowback assembly and a blowback capturing assembly are combined, blowback is adopted to carry out blowback from the inside of the filter bag to the outside, dust outside the filter bag is removed, meanwhile, the blowback capturing assembly is used for carrying out negative pressure suction on the blowback dust, and the dust is forced to be taken away from the inside of the dust remover after being blowback, so that the dust removing efficiency is higher, and high-concentration dust can be directly conveyed to a recovery device through a hung negative pressure pipeline, and long-term accumulation and bridging phenomena of dust in a dust hopper are avoided.

Inventors

  • CHEN NENDI
  • LIN QINGHUA

Assignees

  • 广水华鑫冶金工业有限公司

Dates

Publication Date
20260512
Application Date
20260317

Claims (10)

  1. 1. The utility model provides a blast furnace ironmaking dust collector, includes casing (1), fixes baffle (13) at casing (1) inner wall, fixes filter bag (14) at baffle (13) lower extreme, sets up entry (11) and export (12) in casing (1) both sides respectively, its characterized in that: the air supply device further comprises an air supply unit (2) fixed on one side of the shell (1) and a back-blowing assembly (4) positioned in the shell (1), wherein the output end of the air supply unit (2) is connected with the input end of the back-blowing assembly (4) through a pipeline, and the back-blowing end of the back-blowing assembly (4) stretches into the filter bag (14); The novel filter bag is characterized in that a blowback capturing component (5) is further arranged inside the shell (1), the blowback capturing component (5) comprises a second supporting plate (51) fixed inside the shell (1), a capturing frame (53) rotationally connected to the upper end of the second supporting plate (51), a capturing cavity (54) formed in the side, facing the filter bag (14), of the capturing frame (53), a first runner (55) formed in the capturing frame (53) and communicated with the capturing cavity (54), a second rotary joint (52) fixed to the lower end of the second supporting plate (51), an inner tube of the second rotary joint (52) is connected with the first runner (55), a negative pressure suction part (3) is fixedly connected to the outer wall of one side of the shell (1), and the input end of the negative pressure suction part (3) is connected with the output end of the second rotary joint (52) through a pipeline.
  2. 2. The blast furnace ironmaking dust collector as set forth in claim 1, wherein the blowback assembly (4) comprises a first support plate (41) fixed on the inner wall of the shell (1), a first rotary joint (42) fixedly connected to the upper end of the first support plate (41), a first hollow pipe column (43) rotatably connected to the lower end of the first support plate (41), a blowback plate (44) fixedly connected to the lower end of the first hollow pipe column (43), a plurality of blowback openings (45) formed on one side of the blowback plate (44) facing the inner wall of the filter bag (14), wherein the blowback openings (45) are communicated with the first hollow pipe column (43), and an inner pipe of the first rotary joint (42) is fixedly inserted into the first hollow pipe column (43) and communicated with a hollow cavity inside the first hollow pipe column (43).
  3. 3. The blast furnace ironmaking dust collector as set forth in claim 2, wherein an opening (131) is formed in the partition plate (13), and the first hollow pipe column (43) passes through the opening (131) and enters the filter bag (14).
  4. 4. A blast furnace ironmaking dust collector as set forth in claim 3, further comprising a driving component (6) driving the blowback component (4) and the blowback capturing component (5) to rotate synchronously, wherein the driving component (6) comprises a motor (61) fixed at the upper end of the shell (1), a first transmission rod (62) with two ends connected with the inner wall of the shell (1) and the upper end of the first support plate (41) in a rotating way, a first gear (63) connected with the lower end of the first support plate (41) in a rotating way and connected with the first transmission rod (62), a second gear (64) fixedly sleeved outside the first hollow tubular column (43) and connected with the lower end of the first support plate (41) in a rotating way, a fifth gear (68) connected with the lower end of the partition plate (13) in a rotating way, and a synchronizing component connected with the first gear (63) in a transmitting way and driving the second gear (64) and the fifth gear (68) to rotate synchronously, and the lower end of the fifth gear (68) is fixedly connected with the upper end of the capturing frame (53).
  5. 5. The blast furnace ironmaking dust collector as set forth in claim 4, wherein the synchronous assembly comprises a third gear (65) rotatably connected to the lower end of the first support plate (41) and meshed with the first gear (63) and the second gear (64), a fourth gear (67) rotatably connected to the lower end of the partition plate (13) and meshed with the fifth gear (68), and a second transmission rod (66) with one end fixedly connected to the lower end of the third gear (65) and the other end rotatably connected to the upper end of the partition plate (13), wherein the second transmission rod (66) is connected with the fourth gear (67), the outside of the second transmission rod (66) is connected with the partition plate (13) through a movable sealing piece (132), an air outlet loop (133) is further formed in the partition plate (13), and an air inlet interface communicated with the air outlet loop (133) is formed in the back side of the shell (1).
  6. 6. The blast furnace ironmaking dust collector as set forth in claim 5, further comprising a blowback isolation assembly (7), wherein the blowback isolation assembly (7) comprises a hollow pipeline (72) fixedly inserted in the center of the lower end of the filter bag (14), a second air inlet (71) formed on one side of the capturing frame (53), a plurality of second air outlets (73) formed on one side of the capturing frame (53) towards the filter bag (14), and a second runner (74) formed inside the capturing frame (53) and communicated with the second air inlet (71) and the second air outlets (73), the upper end of the hollow pipeline (72) penetrates out of the filter bag (14) to be connected with a blowback plate (44) in a rotating manner and is communicated with a blowback port (45), and the lower end of the hollow pipeline (72) penetrates out of the lower end of the filter bag (14) to be connected with one side of the capturing frame (53) in a rotating manner and is communicated with the second air inlet (71).
  7. 7. The blast furnace ironmaking dust collector as set forth in claim 6, wherein the plurality of second exhaust ports (73) are connected with the second flow passage (74) through a uniform flow portion (77), and a tapered throat portion (75) is provided on an inner wall of the second exhaust ports (73), and a plurality of swirl flanges (76) are fixed on an inner wall of the tapered throat portion (75).
  8. 8. The blast furnace ironmaking dust collector as set forth in claim 7, wherein the air supply unit (2) comprises an air supply part (21) and a frame (22) fixed on one side of the shell (1), a first air inlet (23) arranged at the lower end of the frame (22) and communicated with the output end of the air supply part (21), a first air outlet (24) arranged at the upper end of the frame (22) and communicated with a pipeline, a resonant cavity (27) arranged inside the frame (22), an ultrasonic transducer (26) fixed on the inner wall of the frame (22), and an ultrasonic radiation plate (25) positioned inside the resonant cavity (27) and fixedly connected with the output end of the ultrasonic transducer (26).
  9. 9. The blast furnace ironmaking dust collector of claim 8, wherein a blanking groove (56) communicated with the capturing cavity (54) is formed in the capturing frame (53), two blanking runners (57) communicated with the blanking groove (56) are symmetrically formed on two sides of the capturing frame (53), and a blocking seat (58) is plugged in the blanking runners (57).
  10. 10. The working method of the blast furnace ironmaking dust collector is characterized by comprising the following steps of: S1, blast furnace gas enters a chamber below the inside of a shell (1) from an inlet (11), is filtered by a filter bag (14), dust in the gas is trapped outside the filter bag (14), and the filtered gas passes through an opening (131) on a partition plate (13) and is discharged from an outlet (12); S2, the air supply unit (2) generates pulse air flow with ultrasonic energy through the ultrasonic transducer (26) and the resonant cavity (27), the air flow enters the blowback plate (44) through the first rotary joint (42) and the first hollow pipe column (43), the air flow is sprayed to the inner wall of the filter bag (14) from the plurality of blowback ports (45), and dust outside the filter bag (14) is separated by utilizing oscillation and air flow pressure; S3, the driving assembly (6) drives the back blowing assembly (4) and the capturing frame (53) to synchronously rotate, so that the back blowing opening (45) and the capturing cavity (54) are always corresponding, and meanwhile, the negative pressure suction part (3) generates suction in the capturing cavity (54) to suck blown dust into the first flow channel (55) and discharge the dust out of the shell (1) through the second rotary joint (52); S4, part of air flows through the hollow pipeline (72) into the second runner (74) of the capturing frame (53) and is sprayed out from the second air outlet (73) with the rotational flow flange (76), an air curtain is formed between the capturing frame (53) and the filter bag (14) to prevent dust from escaping, and floating ash on the surface of the filter bag (14) is pre-stripped by utilizing the formed rotational flow.

Description

Blast furnace ironmaking dust removal device and working method Technical Field The invention relates to the field of gas pollution treatment, in particular to a blast furnace ironmaking dust removal device and a working method thereof. Background The blast furnace ironmaking dust collector is an important environmental protection and energy recovery device in a blast furnace production system of a steel plant. The blast furnace can generate a large amount of blast furnace gas in the iron-making process, and the gas contains a large amount of dust (such as coke powder, iron ore powder, limestone powder and the like), and can not be used as fuel (the pipeline can be blocked and equipment can be burnt out) without dust removal, and can also cause serious pollution to the atmosphere. When the pulse valve is used for blowing, the dust is separated from the filter bag to fall downwards, but the main flue gas flow in the dust remover still moves from bottom to top, and the kinetic energy of the dust with smaller particle size can be counteracted quickly in the falling process, and then is carried up again by the strong upward gas flow to be adsorbed on the filter bag which just removes dust or the adjacent filter bag; The off-line ash removal scheme can solve the problems, the off-line ash removal scheme is characterized in that the inside of a cloth bag dust remover is partitioned, when the back blowing dust removal is carried out on a filter bag in one area, the air inlet of the area is stopped, the other areas can be subjected to normal air inlet filtration, the condition that small particle dust is intercepted in mid-air and is sucked back to the surface of the filter bag is avoided, when the off-line ash removal of one area is carried out, the filtration wind speed of the other areas can be instantaneously increased, the load of the filter bag in the other areas is increased, the filtration resistance is increased suddenly, meanwhile, the off-line ash removal needs to frequently open and close a large-scale switching valve, the opening and closing of the valve can lead to the sudden high and low of the system resistance, the pressure stability of a gas system is very important, and if the pressure difference fluctuation of the dust remover is overlarge, the control of the pressure of the blast furnace top can be influenced, and even the production working condition is disturbed. Disclosure of Invention Aiming at the problems existing in the prior art, the invention aims to provide a blast furnace ironmaking dust removal device and a working method. In order to solve the problems, the invention adopts the following technical scheme. A blast furnace ironmaking dust collector comprises a shell, a baffle plate fixed on the inner wall of the shell, a filter bag fixed on the lower end of the baffle plate, and an inlet and an outlet which are respectively arranged on two sides of the shell; the filter bag comprises a shell, an air supply unit and a back-blowing assembly, wherein the air supply unit is fixed at one side of the shell, the back-blowing assembly is positioned in the shell, the output end of the air supply unit is connected with the input end of the back-blowing assembly through a pipeline, and the back-blowing end of the back-blowing assembly stretches into the filter bag; The inside blowback subassembly of capturing that still is provided with of casing, and the blowback is caught the subassembly and is including fixing at the inside second extension board of casing, rotate the capture frame of connecting in second extension board upper end, set up and catch the frame towards the capture chamber of filter bag one side, set up and catch the first runner that the frame is inside and be linked together with capturing the chamber, fix the second rotary joint at second extension board lower extreme, and the inner tube of second rotary joint links to each other with first runner, casing one side outer wall rigid coupling has negative pressure suction portion, and the input of negative pressure suction portion passes through the pipeline and links to each other with the output of second rotary joint. Further, the blowback subassembly is including fixing at the first extension board of shells inner wall, rigid coupling at the first rotary joint of first extension board upper end, rotate the first cavity tubular column of connecting at first extension board lower extreme, rigid coupling at the blowback board of first cavity tubular column lower extreme, set up a plurality of blowback mouths towards filter bag inner wall one side at the blowback board, and a plurality of blowback mouths are linked together with first cavity tubular column, the inner tube of first rotary joint is fixed to be pegged graft inside first cavity tubular column and is linked together with the inside cavity of first cavity tubular column. Further, an opening is formed in the partition plate, and the first hollow tubular column penetrat