CN214655059U - Dry-method dust removal system for primary flue gas of full-ultra-clean converter - Google Patents
Dry-method dust removal system for primary flue gas of full-ultra-clean converter Download PDFInfo
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- CN214655059U CN214655059U CN202120881755.2U CN202120881755U CN214655059U CN 214655059 U CN214655059 U CN 214655059U CN 202120881755 U CN202120881755 U CN 202120881755U CN 214655059 U CN214655059 U CN 214655059U
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- 239000002245 particle Substances 0.000 abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The utility model provides a flue gas dry process dust pelletizing system once of full ultra-clean converter, including vaporization cooling flue (2), evaporative cooler (3), compound ultra-clean electrostatic precipitator (5) and dust exhausting fan (8) that set gradually, contain electrostatic precipitator section (52) and electron avalanche dust removal section (53) in compound ultra-clean electrostatic precipitator (5), can produce electron avalanche and remove dust in electron avalanche dust removal section (53). The primary flue gas dry dedusting system of the ultra-clean converter abandons the original water treatment system, and can ensure that the concentration of particles in the flue gas recovered by the converter and discharged to the atmosphere is less than or equal to 10mg/Nm3。
Description
Technical Field
The utility model relates to a converter flue gas dust collecting equipment technical field, specific is a flue gas dry process dust pelletizing system of full ultra-clean converter.
Background
The steel production is a complex and long production process, a plurality of process links are needed, and pollutant emission of different types and degrees can be generated in each process. For converter steelmaking, the discharged pollutants are mainly dust particles.
In the traditional converter once dry dedusting, a certain amount of water is still needed for fine dedusting and cooling in the coal gas cooling process after dedusting, so that a water treatment system is also needed, and the converter once dry dedusting still is a potential pollution source, and needs to be solved urgently.
The noun explains:
converter dry dedusting-a gas purification system by atomization spray evaporative cooling and dry dedusting.
Ultra-low emission-the concentration of particulate matter in flue gas discharged to atmosphere is less than or equal to 10mg/Nm3。
Full ultra-clean-the concentration of particulate matters in the flue gas discharged from the atmosphere and the concentration of particulate matters in the recovered clean converter gas are both less than or equal to 10mg/Nm3。
Electron avalanche: when an electron moves from a discharge electrode (cathode) to a dust collecting electrode (anode), if the electric field intensity is large enough, the electron is accelerated, and collision ionization occurs when other atoms collide on the moving path. After ionization by the first collision with other atoms, there is one more free electron. When the two free electrons move to the dust collecting electrode, the two free electrons collide with other atoms to ionize the atoms, each atom generates one more free electron, and then the two free electrons after the second collision are changed into four free electrons which collide with other atoms to ionize the atoms to generate more free electrons. So that one electron from the discharge electrode to the collecting electrode will increase avalanche like the number of electrons due to impact ionization.
Avalanche electrons:
electrons capable of generating an electron avalanche are all electrons emitted from the discharge electrode (cathode) to the dust collecting electrode (anode).
SUMMERY OF THE UTILITY MODEL
In order to realize the complete ultra-clean dust removal of converter coal gas dry process, the utility model provides a flue gas dry process dust pelletizing system of complete ultra-clean converter, this flue gas dry process dust pelletizing system of complete ultra-clean converter abandons original water treatment system, can make the converter retrieve coal gas and all be less than or equal to 10mg/Nm to the particulate matter concentration of atmospheric emission flue gas3。
The utility model provides a technical scheme that its technical problem adopted is:
the utility model provides a flue gas dry process dust pelletizing system once of full ultra-clean converter, along flue gas flow direction, flue gas dry process dust pelletizing system once of full ultra-clean converter is including vaporization cooling flue, evaporative cooler, compound ultra-clean electrostatic precipitator and the dust exhausting fan that sets gradually, contains static dust removal section and electron avalanche dust removal section in the compound ultra-clean electrostatic precipitator, can produce electron avalanche and remove dust in the electron avalanche dust removal section.
The inlet end of the evaporative cooling flue is connected with a smoke hood, the lower part of the evaporative cooler is externally provided with a coarse ash discharge device, the lower part of the composite ultra-clean electric dust remover is externally provided with a fine ash discharge device, a coal gas heat exchanger is further arranged between the composite ultra-clean electric dust remover and a dust removal fan, the outlet end of the dust removal fan is sequentially provided with a silencer and a switching station, and the switching station is externally connected with an ignition diffusing tower and a converter gas cabinet.
The compound ultra-clean electrostatic precipitator is horizontal structure, and compound ultra-clean electrostatic precipitator includes the shell body, and the left end of shell body is equipped with the entry, and the right-hand member of shell body is equipped with the export, along the direction from a left side to the right side, contains the electrostatic precipitator section that a plurality of series connection set up in the shell body, and the length of electrostatic precipitator section is greater than the length of electron avalanche dust removal section.
The electrostatic dust removal section is internally provided with a plurality of electrostatic cathode devices and a plurality of electrostatic anode devices which are alternately arranged at intervals along the front-back direction, and an electrostatic dust removal channel is formed between the electrostatic cathode devices and the electrostatic anode devices.
The electrostatic cathode device comprises a plurality of electrostatic cathode discharge lines which are arranged at intervals along the left-right direction, the electrostatic cathode device is connected with an electrostatic cathode rapping and an electrostatic high-voltage power supply, the electrostatic cathode rapping and the electrostatic high-voltage power supply are positioned on the upper part of the outer shell, and the electrostatic cathode rapping comprises cathode rapping transmission and cathode rapping suspension.
The electrostatic anode device contains upright anode plate, the anode plate is the buckled plate structure, and the electrostatic anode device is connected with the electrostatic anode and shakes and beats, and the electrostatic anode shakes and beats the middle part that is located the shell body, and the electrostatic anode shakes and beats including entry rapping device and export rapping device, and entry rapping device is located the left end of electrostatic anode device, and export rapping device is located the right-hand member of electrostatic anode device.
The electron avalanche dedusting section is internally provided with a plurality of electron avalanche cathode devices and a plurality of electron avalanche anode devices which are alternately arranged at intervals along the front-back direction, an electron avalanche dedusting channel is formed between the electron avalanche cathode devices and the electron avalanche anode devices, the electron avalanche cathode devices and the electron avalanche anode devices can generate the electron avalanche, and when the electron avalanche dedusting section works, avalanche electrons emitted by the electron avalanche cathode devices are 10% -90% of total electrons emitted by the electron avalanche cathode devices in one electron avalanche dedusting channel.
The electron avalanche cathode device comprises a plurality of electron avalanche cathode discharge wires which are arranged at intervals along the left-right direction, the electron avalanche anode device comprises an upright hollow anode plate, a containing cavity which penetrates through the hollow anode plate along the left-right direction is arranged in the hollow anode plate, and a plurality of dust through holes are formed in the front side wall and the rear side wall of the hollow anode plate.
The electron avalanche cathode device is connected with an electron avalanche high-voltage power supply, the electron avalanche high-voltage power supply is positioned on the upper portion of the outer shell, the upper portion of the outer shell is further provided with a sound wave ash removal device, and the sound wave ash removal device can remove dust on the surfaces of the electron avalanche cathode device and the electron avalanche anode device.
The lower extreme of shell body is equipped with the defeated grey groove in bottom, and the defeated grey inslot in bottom contains defeated grey machine, and this defeated grey machine can be carried the dust of the defeated grey inslot of bottom collection outside the shell body, still is equipped with in the shell body and scrapes grey device, scrapes grey device and is fan-shaped mechanical structure, scrapes grey device and can the swing back and forth and scrape the dust of shell body lower part internal surface into the defeated grey inslot in bottom.
The utility model has the advantages that:
1. the process flow of once dust removal of the full-dry converter is adopted, and the coal gas does not need to be sprayed with water for cooling before being sent into a gas holder, and a water treatment system is not needed;
2. the dust removal effect of the composite ultra-clean electric dust remover is good;
3. after the converter flue gas is dedusted, the clean flue gas is subjected to flue gas temperature reduction in the form of a full-dry converter gas heat exchanger, and the heat exchanger can be cooled mechanically or by natural wind. And can be arranged in front of the fan, and also can be arranged behind the switching station and in front of the gas cabinet.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a primary flue gas dry dedusting system of a total ultra-clean converter.
Fig. 2 is a schematic view of the composite ultra-clean electric dust collector of the present invention.
Fig. 3 is a left view schematic diagram of the composite ultra-clean electric dust remover of the present invention.
Fig. 4 is a schematic top view of the composite ultra-clean electric dust collector of the present invention.
Fig. 5 is a schematic view of an electrostatic cathode arrangement and an electrostatic anode arrangement in the direction a-a in fig. 2.
Fig. 6 is an enlarged schematic view of the electrostatic anode arrangement of fig. 5.
Fig. 7 is a schematic view of an electron avalanche cathode arrangement and an electron avalanche anode arrangement taken along the direction B-B in fig. 2.
Fig. 8 is an enlarged schematic view of the electron avalanche anode arrangement of fig. 7.
FIG. 9 is a schematic view of a sonic ash removal device.
Fig. 10 is a schematic view of an ash scraping device.
1. A smoke hood; 2. a vaporizing cooling flue; 3. an evaporative cooler; 4. a coarse ash discharge device; 5. a composite ultra-clean electric dust remover; 6. a fine ash discharge device; 7. a gas heat exchanger; 8. a dust removal fan; 9. a muffler; 10. switching stations; 11. an ignition and emission tower; 12. a converter gas chamber;
51. a conical inlet section; 52. an electrostatic dust removal section; 53. an electron avalanche dust removal section; 54. a conical outlet section; 55. a dust scraping device; 56. a bottom ash conveying groove; 57. an explosion venting valve; 58. supporting steel; 59. an outer housing;
511. an inlet;
521. an electrostatic cathode arrangement; 522. an electrostatic anode device; 523. rapping an electrostatic cathode; 524. electrostatic anode rapping; 525. an electrostatic high voltage power supply; 526. an electrostatic dust removal channel;
5231. the cathode is in vibration transmission; 5232. hanging the cathode by vibration;
5241. an inlet rapping device; 5242. an outlet rapping device;
531. an electron avalanche cathode arrangement; 532. an electron avalanche anode arrangement; 533. a sonic ash removal device; 534. an electron avalanche high voltage power supply; 535. an electron avalanche dust removal channel;
5321. a receiving cavity; 5322. a dust through hole;
541. and (7) an outlet.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The utility model provides a flue gas dry dedusting system once of full ultra-clean converter, along flue gas flow direction (from left to right in fig. 1), this flue gas dry dedusting system once of full ultra-clean converter is including the vaporization cooling flue 2, evaporative cooler 3, compound ultra-clean electrostatic precipitator 5 and the dust exhausting fan 8 that set gradually, contains electrostatic precipitator section 52 and electron avalanche dust removal section 53 in the compound ultra-clean electrostatic precipitator 5, can produce electron avalanche and remove dust in the electron avalanche dust removal section 53, as shown in fig. 1.
The composite super of the utility modelIn the electric dust remover (the electric dust remover with composite structure, ultra-clean structure and high efficiency) is coupled with the electrostatic dust removal and electronic avalanche dust removal technologies, and the electrostatic dust removal section 52 is positioned at the upstream and used for collecting coarse dust particles in the flue gas; the electronic avalanche dedusting section 53 is positioned at the downstream and used for collecting fine dust particles in the flue gas, and the fine dust particles are purified by the composite electric field, so that the concentration of the flue gas dust is 120g/Nm from the inlet3Can be reduced to less than or equal to 10mg/Nm3And the dust removal efficiency exceeds 99.993%.
In this embodiment, the inlet end of the evaporative cooling flue 2 is connected with a smoke hood 1, the lower part of the evaporative cooler 3 is externally provided with a coarse ash discharge device 4, the lower part of the composite ultra-clean electric dust remover 5 is externally provided with a fine ash discharge device 6, a coal gas heat exchanger 7 is further arranged between the composite ultra-clean electric dust remover 5 and the dust removal fan 8, the outlet end of the dust removal fan 8 is sequentially provided with a silencer 9 and a switching station 10, the switching station 10 is externally connected with an ignition diffusing tower 11 and a converter gas cabinet 12, and the ignition diffusing tower 11 and the converter gas cabinet 12 are connected in parallel.
In this embodiment, compound ultra-clean electrostatic precipitator 5 is horizontal structure, compound ultra-clean electrostatic precipitator 5 includes shell body 59, the left end of shell body 59 is equipped with entry 511, the right-hand member of shell body 59 is equipped with export 541, along the direction from left to right, contain electrostatic precipitator section 52 and electron avalanche precipitation section 53 in compound ultra-clean electrostatic precipitator 5, especially contain the electrostatic precipitator section 52 of a plurality of series arrangements in the shell body 59, the length of electrostatic precipitator section 52 is greater than the length of electron avalanche precipitation section 53, as shown in fig. 2 to fig. 4.
In the present embodiment, the outer casing 59 comprises a conical inlet section 51 and a conical outlet section 54, and the conical inlet section 51, the electrostatic precipitator section 52, the electron avalanche precipitator section 53 and the conical outlet section 54 are arranged in sequence from left to right. A plurality of serially arranged electrostatic precipitator sections 52 are located between the conical inlet section 51 and the electron avalanche precipitation section 53, the inlet 511 is located at the left end of the conical inlet section 51, and the outlet 541 is located at the right end of the conical outlet section 54.
In this embodiment, the conical inlet section 51 contains a plurality of vertical air distribution plates, the air distribution plates are arranged at intervals along the front-back direction, and the air distribution plates form a grid structure, so as to ensure that the flue gas uniformly enters the subsequent electric field. The conical inlet section 51 and the conical outlet section 54 are both provided with explosion venting valves 57, the explosion venting valves 57 are safe pressure relief devices, and 6-8 sets of explosion venting valves are arranged according to the size of the dust remover; the explosion venting valve 57 is of a spring mechanical structure, when the pressure in the dust remover reaches a preset value, the explosion venting valve is automatically and rapidly opened to release the pressure, and the explosion venting valve automatically resets and seals after the pressure is qualified.
In the present embodiment, the outer casing 59 contains a plurality of electrostatic precipitator sections 52 arranged in series, the plurality of electrostatic precipitator sections 52 are arranged in sequence from left to right, and the length (dimension in the left-right direction) of the electrostatic precipitator section 52 is greater than the length (dimension in the left-right direction) of the electron avalanche precipitator section 53. The number of the electrostatic dust removal sections 52 can be 3-5 (3-level to 5-level), the electrostatic dust removal sections 52 are wide-spacing long electric fields, the smoke retention time is longer, coarse dust particles in smoke can be better collected, the electronic avalanche dust removal sections 53 are narrow-spacing short electric fields, the electric field voltage is higher, and fine dust particles in smoke can be better collected.
In the present embodiment, the electrostatic precipitator section 52 includes a plurality of electrostatic cathode devices 521 and a plurality of electrostatic anode devices 522 alternately arranged in the front-back direction, a plurality of electrostatic precipitator channels 526 arranged side by side are formed between the plurality of electrostatic cathode devices 521 and the plurality of electrostatic anode devices 522, a plurality of electrostatic fields are formed between the plurality of electrostatic cathode devices 521 and the plurality of electrostatic anode devices 522, no electron avalanche is generated in the electrostatic fields (generally, in the prior art, no electron avalanche is generated in the electrostatic fields, and even if the electron avalanche occurs in a small amount occasionally, the number of avalanche electrons generated in the electrostatic fields is far smaller than the number of avalanche electrons in the electron avalanche electric fields, the influence of electrons in the electrostatic avalanche fields is weak, which can be considered as unexpected), and the plurality of electrostatic fields are arranged at intervals in the front-back direction, as shown in fig. 5.
In this embodiment, each electrostatic cathode device 521 includes a plurality of electrostatic cathode discharge lines arranged at intervals in the left-right direction, the electrostatic cathode discharge lines are provided with a plurality of discharge tips, the plurality of discharge tips are arranged in the up-down direction, the electrostatic cathode device 521 is connected with an electrostatic cathode rapping 523 and an electrostatic high voltage power supply 525, the electrostatic cathode rapping 523 and the electrostatic high voltage power supply 525 are located at the upper portion of the outer casing 59, and the electrostatic cathode rapping 523 includes a cathode rapping transmission 5231 and a cathode rapping suspension 5232.
In this embodiment the electrostatic anode arrangement 522 comprises an upright anode plate of corrugated plate construction, as shown in fig. 6, the electrostatic anode arrangement 522 is connected with an electrostatic anode rapping 524, the electrostatic anode rapping 524 being located outside the middle portion of the outer housing 59. In order to ensure the rapping effect, the electrostatic anode rapping 524 comprises an inlet rapping device 5241 and an outlet rapping device 5242, the inlet rapping device 5241 being located at the left end of the electrostatic anode device 522 and the outlet rapping device 5242 being located at the right end of the electrostatic anode device 522.
The electrostatic cathode assembly 521 is suspended and mounted in the outer casing 59 by an electrostatic cathode mount and a cathode rapping suspension 5232, and the electrostatic anode assembly 522 is suspended and mounted in the outer casing 59 by an electrostatic anode mount. The electrostatic cathode device 521 and the electrostatic anode device 522 are parallel to the direction of the flue gas, the electrostatic cathode device 521 is used as a discharge electrode of an electric field, and discharges electricity at the tip of the discharge electrode through the electrostatic high-voltage power supply 525 to generate a large amount of charged particles, so that dust in the flue gas is charged, the charged dust moves to the electrostatic anode device 522 under the action of the electric field force, and the dust releases the charge and is trapped after reaching the electrostatic anode device 522.
The electrostatic cathode rapping 523 is arranged at the top of the electric field, and drives a rapping hammer to generate proper rapping force through mechanical transmission, so that dust on the electrostatic cathode device 521 is rapped and falls to the bottom dust conveying tank 56; an electrostatic anode rapping 524 is arranged in the middle of the electric field, and the rapping hammer is also driven by mechanical transmission to generate a suitable rapping force, so that the dust on the electrostatic anode device 522 is rapped and falls down to the bottom dust conveying tank 56.
In the present embodiment, the electron avalanche dedusting section 53 includes a plurality of electron avalanche cathode devices 531 and a plurality of electron avalanche anode devices 532 alternately arranged in the front-back direction, a plurality of electron avalanche dedusting channels 535 are formed between the plurality of electron avalanche cathode devices 531 and the plurality of electron avalanche anode devices 532, and a plurality of electron avalanche electric fields are formed between the plurality of electron avalanche cathode devices 531 and the plurality of electron avalanche anode devices 532, and the electron avalanche electric fields can generate electron avalanches in the electron avalanche electric fields to remove dust, that is, the electron avalanche cathode devices 531 and the electron avalanche anode devices 532 can generate the electron avalanches to remove dust, as shown in fig. 7.
When the electron avalanche dedusting section 53 works, in an electron avalanche dedusting channel 535, a part of all electrons emitted by the electron avalanche cathode device 531 to the electron avalanche anode device 532 are avalanche electrons, the avalanche electrons emitted by the electron avalanche cathode device 531 account for 10% -90% of the total electrons emitted by the electron avalanche cathode device 531, and the dedusting in the electron avalanche dedusting section 53 mainly depends on electron avalanche. Preferably, within one electron avalanche de-dusting channel 535, the avalanche electrons emitted by the electron avalanche cathode arrangement 531 are 50% -80% of the total electrons emitted by the electron avalanche cathode arrangement 531.
In the present embodiment, the electron avalanche dedusting section 53 mainly collects the remaining fine dust in the flue gas, the electron avalanche cathode device 531 includes a plurality of electron avalanche cathode discharge lines arranged at intervals in the left-right direction, and the structure of the electron avalanche cathode device 531 is substantially the same as that of the electrostatic cathode device 521. The electron avalanche anode device 532 comprises an upright hollow anode plate, which has a receiving cavity 5321 penetrating in the left-right direction, and a plurality of dust through holes 5322 are formed on the front side wall and the rear side wall of the hollow anode plate, as shown in fig. 8. In addition, the bottom of the hollow anode plate is provided with a dust discharge port, and dust in the hollow anode plate can be discharged from the dust discharge port during sound wave dust removal.
In this embodiment, the electron avalanche cathode device 531 is connected to an electron avalanche high voltage power supply 534, the electron avalanche high voltage power supply 534 is located outside the upper portion of the outer casing 59, and the generation of electron avalanche depends on the voltage of the electron avalanche high voltage power supply 534 and the distance between the electron avalanche cathode device 531 and the electron avalanche anode device 532. The voltage value of the electron avalanche high voltage power supply 534 and the distance between the electron avalanche cathode arrangement 531 and the electron avalanche anode arrangement 532 can be obtained by a limited number of experiments to produce the desired electron avalanche.
Specifically, the voltage of the electron avalanche high voltage power supply 534 can be selected to be 40kV to 60kV, such as about 50k, and the distance between the electron avalanche cathode device 531 and the electron avalanche anode device 532 can be selected to be 125mm to 175mm, such as about 150 mm.
In this embodiment, an acoustic wave ash removal device 533 is further disposed on the upper portion of the outer casing 59, and the acoustic wave ash removal device 533 can remove dust on the surfaces of the electron avalanche cathode device 531 and the electron avalanche anode device 532, as shown in fig. 4 and 9. In order to avoid the secondary dust raising phenomenon caused by mechanical vibration, the dust removal of the electronic avalanche dust removal section 53 adopts a sound wave dust removal device 533 which is positioned at the top of the outer shell 59, and two or more groups can be selected according to the smoke amount and the specification of the dust remover; the converter smelting interval is utilized during the ash removal by sound wave, at the moment, the minimum smoke gas content of the converter is the lowest, and the rotating speed of a fan can be reduced to the lowest, so that the secondary entrainment of dust in the ash removal process is reduced to the maximum extent.
An electron avalanche cathode arrangement 531 is suspended in the outer housing 59 by an electron avalanche cathode mount and a cathode rapping suspension 5232, and an electron avalanche anode arrangement 532 is suspended in the outer housing 59 by an electron avalanche anode mount. The electron avalanche cathode device 531 and the electron avalanche anode device 532 are parallel to the smoke direction, the electron avalanche cathode device 531 is used as a discharge electrode of an electric field, discharge is carried out at the tip of the discharge electrode through an electron avalanche high-voltage power supply 534 to generate a large amount of charged particles, so that fine dust in smoke is charged, the charged dust moves to the electron avalanche anode device 532 under the combined action of electric field force and electric wind, the dust passes through the dust through hole 5322 to enter the accommodating cavity 5321 after reaching the electron avalanche anode device 532, and the dust releases charges in the hollow anode plate and is locked and trapped.
In this embodiment, a bottom ash conveying groove 56 is formed in the lower end of the outer casing 59, an ash conveyor is arranged in the bottom ash conveying groove 56, the ash conveyor can convey the dust collected in the bottom ash conveying groove 56 to the outside of the outer casing 59, an ash scraping device 55 is further arranged in the outer casing 59, the ash scraping device 55 is of a fan-shaped mechanical structure, and the ash scraping device 55 can swing back and forth and scrape the dust on the inner surface of the lower portion of the outer casing 59 into the bottom ash conveying groove 56, as shown in fig. 2, 3, 4 and 10. In addition, a steel support 58 is connected to the lower portion of the outer shell 59, the steel support 58 supports the outer shell 59 on the ground foundation and is elevated, and a group of outer shells 59 can be arranged at each ring beam.
The bottom ash conveying groove 56 is of an integral structure, and a chain type ash conveyor is arranged in the bottom ash conveying groove 56 and can convey collected dry ash to the machine head and discharge the dry ash out of the dust remover. The ash scraping device 55 can swing back and forth along the lower part of the dust remover within the range of about 120 degrees, the ash scraping device 55 is divided into an inlet side and an outlet side, the inlet side is responsible for the two electrostatic dust removing sections 52 at the front left side, and the outlet side is responsible for the rest of the electrostatic dust removing sections 52 and the electron avalanche dust removing section 53. The lower ends of the electrostatic cathode device 521, the electrostatic anode device 522, the electron avalanche cathode device 531 and the electron avalanche anode device 532 are spaced from the lower end of the outer casing 59, so that the ash scraping device 55 can swing back and forth.
The operation of the composite ultra-clean electric dust collector 5 will be described.
1. The upstream untreated dust-containing flue gas enters the composite ultra-clean electric dust remover 5 through the inlet 511, and the flue gas is uniformly distributed and guided by an air flow distribution plate in the conical inlet section 51;
2. the flue gas firstly enters the first electrostatic dust removal section 52 at a proper flow rate, dust in the flue gas in the electrostatic dust removal section 52 is charged (charged) under the action of an electrostatic high-voltage power supply 525, and the charged dust moves to the electrostatic anode device 522 and is trapped under the action of an electric field force;
3. the flue gas processed by the first electrostatic dust removal section 52 continues to move backwards, and then enters a second electrostatic dust removal section 52, a third electrostatic dust removal section 52 and the like in sequence, most of dust in the flue gas is trapped in an electrostatic field, and the dust is rapped to the lower part of the dust remover through the arranged electrostatic cathode rapping 523 and the electrostatic anode rapping 524;
4. the flue gas treated by the electrostatic field enters a final-stage electron avalanche dedusting section 53, dust in the flue gas is mainly fine dust with the particle size less than or equal to 10 microns, partial fine dust is charged under the action of an electron avalanche high-voltage power supply 534, meanwhile, an electron avalanche cathode device 531 generates electric wind, and the fine dust moves to an electron avalanche anode device 532 under the action of electric field force and electric field wind caused by electron avalanche and is trapped;
5. in the electron avalanche dedusting section 53, the ash collected by the electron avalanche cathode device 531 and the electron avalanche anode device 532 is fine dust with small ash amount, and the collected fine dust is vibrated to the lower part of the electric field by two or more groups of sound wave ash removal devices 533 arranged at the top of the electric field, which is specifically described that, because of the periodicity of converter smelting, a clearance period of more than ten minutes is generated after each furnace smelting, and during the clearance period, once flue gas of the converter is not generated, so the rotating speed of a fan can be reduced to the minimum, at this time, the fine dust vibrated down by the sound wave ash removal devices 533 is not easily taken away by the flue gas, but falls to the lower part of the electric field under the action of gravity;
6. the ash scraping device 55 scrapes dry ash on the lower part of all the electric fields into the bottom ash conveying groove 56, and the dry ash is discharged out of the composite ultra-clean electric dust collector through a scraper in the ash conveying groove;
7. the dedusted flue gas is discharged from an outlet 541, and the dust content of the flue gas after passing through an electronic avalanche dedusting section 53 is less than or equal to 10mg/Nm3The ultra-clean flue gas enters the subsequent facilities through the outlet 541 as shown in fig. 2 to 10.
The working process of the primary flue gas dry dedusting system of the ultra-clean converter is described below.
1. And starting the dust removal fan 8 to start the power of the whole system, namely, taking the dust removal fan 8 as a main power source for the flow of the flue gas of the primary flue gas dry-method dust removal system of the ultra-clean converter.
2. The converter smoke is collected by the smoke hood 1 and is cooled to 900-1000 ℃ through the vaporizing cooling flue 2.
3. The flue gas enters an evaporative cooler 3, a proper amount of water is sprayed, and the flue gas of the converter is completely evaporated and tempered so that downstream electric dust removal can capture particles in the flue gas of the converter, and meanwhile, the temperature of the flue gas is reduced to 200-250 ℃. And partial fine particles in the flue gas are collected by the sprayed water mist, collided and condensed into large particles, and the large particles and the coarse particles are settled in the banana bend at the bottom of the evaporative cooler 3 together, transported through the coarse ash discharge device 4, stored and finally discharged outside.
4. The flue gas enters a composite ultra-clean electric dust remover 5 for further dust removal, and finally the dust content concentration at the outlet of the composite ultra-clean electric dust remover 5 is reduced to be less than or equal to 10mg/Nm3。
5. The converter ash adsorbed by the electric field anode plate falls into the bottom ash conveying groove 56 in a vibration or ultrasonic mode, and the fine ash is transported and stored through the fine ash discharging device 6 after going out.
6. Clean converter flue gas passes through an all-dry converter gas heat exchanger (namely a gas heat exchanger 7), air is used as a cooling medium for the heat exchanger, a mechanical cooling mode or a natural cooling mode can be adopted for replacing a traditional water-spraying cooling gas cooler, and the temperature of the converter flue gas is reduced to 65 ℃ or below. The gas heat exchanger 7 can also be arranged behind the switching station 10 and in front of the converter gas cabinet 12, or in front of the dust removal fan 8, preferably in front of the dust removal fan 8, so that the fan can suck cold flue gas, and a small-size fan can be selected, thereby further reducing the engineering investment. And the temperature resistance level of equipment behind the fan can be reduced.
7. The clean converter flue gas is pressurized by a dust removal fan 8, and the noise of the fan is reduced by a silencer 9.
8. Clean converter flue gas enters a switching station 10, and when the concentration of oxygen is more than 1 percent (under the condition of not causing explosion, the concentration set value can be properly adjusted) through an oxygen and carbon monoxide concentration detection device arranged in front of the switching station 10, a diffusing valve is opened, a recovery valve is closed, and the dust content concentration is less than or equal to 10mg/Nm3The converter flue gas is sent to an ignition and diffusion tower 11 to be ignited and diffused. When the oxygen content concentration is less than or equal to 1 percent and the carbon monoxide concentration is more than or equal to 30 percent (the concentration set value can be properly adjusted according to the specification of a user), the recovery valve is opened, the blow-off valve is closed, and the dust content concentration is less than or equal to 10mg/Nm3The qualified converter gas is sent to a converter gas cabinet 12.
For convenience of understanding and description, the present invention is described using an absolute positional relationship, where the term "up" indicates an upper direction in fig. 2, the term "down" indicates a lower direction in fig. 2, the term "left" indicates a left direction in fig. 2, the term "right" indicates a right direction in fig. 2, the term "front" indicates a direction perpendicular to the paper surface of fig. 2 and directed to the inside of the paper surface, and the term "back" indicates a direction perpendicular to the paper surface of fig. 2 and directed to the outside of the paper surface, unless otherwise specified. The present invention is described by using the observation angle of the reader, but the above-mentioned orientation words can not be understood or interpreted as the limitation of the protection scope of the present invention.
The above description is only for the specific embodiments of the present invention, and the scope of the present invention can not be limited by the embodiments, so that the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should still belong to the scope covered by the present patent. In addition, the utility model provides an between technical feature and the technical feature, between technical feature and technical scheme, technical scheme and the technical scheme all can the independent assortment use.
Claims (10)
1. The utility model provides a flue gas dry process dust removal system once of full ultra-clean converter, its characterized in that, along the flue gas flow direction, flue gas dry process dust removal system once of full ultra-clean converter is including vaporization cooling flue (2), evaporative cooler (3), compound ultra-clean electrostatic precipitator (5) and dust exhausting fan (8) that set gradually, contains in compound ultra-clean electrostatic precipitator (5) electrostatic precipitator section (52) and electron avalanche dust removal section (53), can produce electron avalanche and remove dust in electron avalanche dust removal section (53).
2. The system for removing the primary flue gas from the fully ultra-clean converter by the dry method according to claim 1, wherein a smoke hood (1) is connected to an inlet end of a vaporization cooling flue (2), a coarse ash discharge device (4) is arranged outside the lower part of an evaporative cooler (3), a fine ash discharge device (6) is arranged outside the lower part of a composite ultra-clean electric dust remover (5), a coal gas heat exchanger (7) is further arranged between the composite ultra-clean electric dust remover (5) and a dust removing fan (8), a silencer (9) and a switching station (10) are sequentially arranged outside an outlet end of the dust removing fan (8), and an ignition diffusing tower (11) and a converter gas cabinet (12) are connected outside the switching station (10).
3. The system for one-time flue gas dry dedusting of the full-ultra-clean converter according to claim 1, wherein the composite ultra-clean electric dust remover (5) is of a horizontal structure, the composite ultra-clean electric dust remover (5) comprises an outer shell (59), an inlet (511) is arranged at the left end of the outer shell (59), an outlet (541) is arranged at the right end of the outer shell (59), a plurality of electrostatic dedusting sections (52) arranged in series are contained in the outer shell (59) along the direction from left to right, and the length of the electrostatic dedusting section (52) is greater than that of the electronic avalanche dedusting section (53).
4. The system for one-time flue gas dry dedusting of the total ultra-clean converter according to claim 3, wherein the electrostatic dedusting section (52) comprises a plurality of electrostatic cathode devices (521) and a plurality of electrostatic anode devices (522) alternately arranged along a front-back direction, and an electrostatic dedusting channel (526) is formed between the electrostatic cathode devices (521) and the electrostatic anode devices (522).
5. The system for one-time flue gas dry dedusting of the total ultra-clean converter according to claim 4, wherein the electrostatic cathode device (521) comprises a plurality of electrostatic cathode discharge lines arranged at intervals along the left-right direction, the electrostatic cathode device (521) is connected with an electrostatic cathode rapping (523) and an electrostatic high-voltage power supply (525), the electrostatic cathode rapping (523) and the electrostatic high-voltage power supply (525) are both positioned at the upper part of the outer shell (59), and the electrostatic cathode rapping (523) comprises a cathode rapping transmission (5231) and a cathode rapping (5232).
6. The system for one-time flue gas dry dedusting of the ultra-clean converter according to claim 4, wherein the electrostatic anode device (522) comprises an upright anode plate, the anode plate is of a corrugated plate structure, the electrostatic anode device (522) is connected with an electrostatic anode rapping device (524), the electrostatic anode rapping device (524) is located in the middle of the outer shell (59), the electrostatic anode rapping device (524) comprises an inlet rapping device (5241) and an outlet rapping device (5242), the inlet rapping device (5241) is located at the left end of the electrostatic anode device (522), and the outlet rapping device (5242) is located at the right end of the electrostatic anode device (522).
7. The system for the dry dedusting of the primary flue gas from the ultra-clean converter according to the claim 3, wherein the electron avalanche dedusting section (53) comprises a plurality of electron avalanche cathode devices (531) and a plurality of electron avalanche anode devices (532) alternately arranged at intervals in the front-back direction, an electron avalanche dedusting channel (535) is formed between the electron avalanche cathode devices (531) and the electron avalanche anode devices (532), the electron avalanches can be generated between the electron avalanche cathode devices (531) and the electron avalanche anode devices (532), and when the electron avalanche dedusting section (53) works, avalanche electrons emitted by the electron avalanche cathode devices (531) are 10% -90% of total avalanche electrons emitted by the electron avalanche cathode devices (531) in one electron avalanche dedusting channel (535).
8. The system for the dry dedusting of the primary flue gas of the total ultra-clean converter according to claim 7, wherein the electron avalanche cathode device (531) comprises a plurality of electron avalanche cathode discharge wires arranged at intervals along the left-right direction, the electron avalanche anode device (532) comprises an upright hollow anode plate, a containing cavity (5321) penetrating along the left-right direction is formed in the hollow anode plate, and a plurality of dust through holes (5322) are formed in the front side wall and the rear side wall of the hollow anode plate.
9. The system for the dry dedusting of the primary flue gas of the ultra-clean converter according to claim 7, wherein the electron avalanche cathode device (531) is connected with an electron avalanche high voltage power supply (534), the electron avalanche high voltage power supply (534) is located at the upper part of the outer shell (59), the upper part of the outer shell (59) is further provided with a sound wave ash removal device (533), and the sound wave ash removal device (533) can remove dust on the surfaces of the electron avalanche cathode device (531) and the electron avalanche anode device (532).
10. The system for removing dust by the dry method according to the one-time flue gas of the ultra-clean converter according to claim 3, wherein a bottom ash conveying groove (56) is formed in the lower end of the outer shell (59), an ash conveyor is arranged in the bottom ash conveying groove (56), the ash conveyor can convey the dust collected in the bottom ash conveying groove (56) to the outside of the outer shell (59), an ash scraping device (55) is further arranged in the outer shell (59), the ash scraping device (55) is of a fan-shaped mechanical structure, and the ash scraping device (55) can swing back and forth and scrape the dust on the inner surface of the lower portion of the outer shell (59) into the bottom ash conveying groove (56).
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| CN202120881755.2U CN214655059U (en) | 2021-04-27 | 2021-04-27 | Dry-method dust removal system for primary flue gas of full-ultra-clean converter |
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| CN202120881755.2U CN214655059U (en) | 2021-04-27 | 2021-04-27 | Dry-method dust removal system for primary flue gas of full-ultra-clean converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115247223A (en) * | 2021-04-27 | 2022-10-28 | 中冶京诚工程技术有限公司 | Dry-method dust removal system for primary flue gas of full-ultra-clean converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115247223A (en) * | 2021-04-27 | 2022-10-28 | 中冶京诚工程技术有限公司 | Dry-method dust removal system for primary flue gas of full-ultra-clean converter |
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Effective date of registration: 20221215 Address after: Room 405, No. 7 Jian'an Street, Daxing District Economic and Technological Development Zone, Beijing 100176 Patentee after: BEIJING JINGCHENG ZEYU ENERGY ENVIRONMENTAL PROTECTION ENGINEERING TECHNOLOGY Co.,Ltd. Patentee after: Capital Engineering & Research Incorporation Limited Address before: 100176 No.7 Jian'an street, Beijing Economic and Technological Development Zone, Daxing District, Beijing Patentee before: Capital Engineering & Research Incorporation Limited |
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