CN211503737U - Comprehensive treatment system for flue gas of rotary hearth furnace - Google Patents
Comprehensive treatment system for flue gas of rotary hearth furnace Download PDFInfo
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- CN211503737U CN211503737U CN201922110749.2U CN201922110749U CN211503737U CN 211503737 U CN211503737 U CN 211503737U CN 201922110749 U CN201922110749 U CN 201922110749U CN 211503737 U CN211503737 U CN 211503737U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model relates to a rotary hearth furnace flue gas comprehensive treatment system, treatment system include the rotary hearth furnace, and rotary hearth furnace high temperature flue gas outlet connects exhaust-heat boiler, exhaust-heat boiler's exit linkage air heat exchanger, and bag collector is connected to the air heat exchanger, and bag collector's exit end passes through the pipe connection cyclone, and the chimney is connected to the cyclone. The frequency-adjustable high sound intensity sound wave soot blower positioned on the air heat exchanger can effectively unblock and descale the heat exchanger; after zinc-containing metal dust enters the bag-type dust collector, ultrafine particles are agglomerated into larger particles through the first sound wave agglomeration device, so that the efficiency of recovering the metal dust of the bag-type dust collector is improved; the bag-type dust remover can be further deblocked in real time, the service life of a bag is prolonged, the cost is reduced, and high-sound-intensity sound waves synergistically improve the effect and remove scale of the bag-type dust remover in a rotary hearth furnace flue gas system; the front section of the chimney achieves the requirement of ultra-low emission of the flue gas of the rotary hearth furnace through the sound wave agglomeration dust removal device.
Description
Technical Field
The utility model relates to a rotary hearth furnace flue gas comprehensive treatment system, the utility model belongs to the technical field of high temperature flue gas is handled, in particular to rotary hearth furnace flue gas system prevents bonding and blocking method, and zinciferous metal dust is retrieved in the flue gas, and the ultralow emission of flue gas is administered technical field.
Background
Although the existing rotary hearth furnace flue gas treatment system can realize basic flue gas recycling treatment, because high-temperature flue gas frequently generates blockage phenomenon through a waste heat boiler and a heat exchanger, the blockage of the flue gas system causes a series of consequences for the production operation of the rotary hearth furnace: the blockage of the flue gas system causes the formation of positive pressure in the rotary hearth furnace, further causes the overflow of coal gas, destroys the reduction conditions in the rotary hearth furnace and reduces the operation and safety of equipment; particularly, the adhesive which causes the blockage of the smoke system of the rotary hearth furnace has large viscosity, strong corrosivity and water absorption, is combined with zinc oxide dust to form a compact substance, is difficult to clean, is easy to damage equipment and is easy to cause poisoning of cleaning personnel. The production has to be stopped frequently, and the continuous production of the rotary hearth furnace is seriously influenced.
Chinese utility model patent application publication No. CN 103983120a, a metallurgical zinc dust mud technology flue gas system anti-sticking method is handled to rotary hearth furnace, make the flue gas quench in easy bonding temperature interval through the mode of adding cold wind, and avoid being in flue gas and exhaust-heat boiler and the contact of low temperature heat exchanger heat exchange tube bundle between this temperature interval, set up low temperature heat exchanger one-for-one and prepare and off-line maintenance, thereby furthest reduced the flue gas system and taken place the possibility of blockking up, but this technological method maneuverability is poor, and it is not thorough to remove stifled, be difficult to get rid of to the inside dirt layer of heat exchanger element.
The smoke of the rotary hearth furnace generates a large amount of dust, the main component of the dust is iron oxide, but the dust contains a certain amount of zinc oxide, if the dust is not utilized, resources are wasted and the environment is polluted, the dust is returned to be sintered in the traditional treatment method, but the zinc is enriched in the blast furnace by the treatment method, so that the blast furnace is affected by accretion in the blast furnace, and smelting equipment is damaged. Because zinciferous dust particle is slight, and bag collector collection is not thorough, and recovery efficiency is low, chinese utility model patent application publication No. CN101386913A discloses a method for zinc oxide recovery is handled to zinciferous dust by rotary hearth furnace, mixes zinciferous dust with coal and flux, then sends into rotary hearth furnace after the briquetting is dried and carries out direct reduction, and zinc in the dust is retrieved from waste gas. The method can consume a large amount of coal raw materials, and has low recovery efficiency. The system and the method for comprehensively treating the flue gas of the rotary hearth furnace can effectively solve the problems of serious blockage of a flue gas heat exchange system and unqualified flue gas emission caused by low metal dust recycling in the flue gas.
The method has the advantages of thorough blockage removal, obvious dust collection and efficiency improvement effects, strong operability and cost saving. Effectively solves the problem of incomplete treatment of the flue gas of the rotary hearth furnace.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a system for comprehensive treatment of the flue gas of the rotary hearth furnace, which solves the problems of scaling and blockage in the flue gas heat exchange system of the rotary hearth furnace; meanwhile, the recovery efficiency of metal in the flue gas is improved, and the bag type dust collector is cooperatively used for removing scale and ash, so that the service life of the bag type dust collector is prolonged; and simultaneously, the problem that the smoke emission does not reach the standard is solved.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a rotary hearth furnace flue gas comprehensive treatment system, includes the rotary hearth furnace, and rotary hearth furnace high temperature flue gas outlet connects exhaust-heat boiler, and exhaust-heat boiler's exit linkage air heat exchanger, bag collector are connected to air heat exchanger, and the exit end of bag collector passes through pipe connection cyclone, and cyclone connects the chimney.
Furthermore, the rotary hearth furnace flue gas comprehensive treatment system is characterized in that the air heat exchanger is provided with a frequency-adjustable high-sound-intensity sound wave soot blower, and a sound wave output port of the frequency-adjustable high-sound-intensity sound wave soot blower is arranged right opposite to a heat exchange element in the air heat exchanger.
Furthermore, the above comprehensive treatment system for the flue gas of the rotary hearth furnace comprises a bag type dust collector, a dust filter bag arranged in the dust collector and a recovery collecting hopper arranged at the bottom of the dust collector.
Furthermore, the rotary hearth furnace flue gas comprehensive treatment system is characterized in that the return collecting hopper is detachably arranged at the bottom of the dust remover body.
Furthermore, the rotary hearth furnace flue gas comprehensive treatment system is characterized in that a first sound wave aggregation device is arranged on the dust remover body, and the sound wave output end of the first sound wave aggregation device is opposite to the interior of the dust remover body.
Furthermore, the rotary hearth furnace flue gas comprehensive treatment system is characterized in that a fan is arranged on a pipeline connected with the bag type dust collector and the cyclone dust collector.
Furthermore, in the comprehensive treatment system for the flue gas of the rotary hearth furnace, the cyclone dust collector comprises cyclone dust removing units arranged in a multi-stage manner, a transition cavity is arranged between every two adjacent cyclone dust removing units, and a second sound wave agglomeration device is arranged on the transition cavity; an inlet is arranged below the cyclone ash removal unit at the lowest end of the cyclone dust collector, an ash hopper is arranged at the bottom end of the cyclone dust collector, and an outlet is arranged at the top end of the cyclone dust collector.
Furthermore, the ash bucket of the rotary hearth furnace flue gas comprehensive treatment system is detachably connected with the bottom of the cyclone dust collector.
Furthermore, the rotary hearth furnace flue gas comprehensive treatment system is characterized in that the multistage cyclone dust removal units comprise three stages of cyclone dust removal units from bottom to top, wherein the particle size of dust removed by the first stage cyclone dust removal unit is 20-500 mu m, the particle size of dust removed by the second stage cyclone dust removal unit is 15-30 mu m, and the particle size of dust removed by the third stage cyclone dust removal unit is 1-15 mu m.
According to the method for treating the rotary hearth furnace flue gas comprehensive treatment system, high-temperature flue gas discharged from the rotary hearth furnace enters the waste heat boiler for heat exchange and cooling, the flue gas discharged from the waste heat boiler enters the air heat exchanger for heat exchange, continuous descaling and blockage removal in the heat exchange process are realized through the frequency-adjustable high-sound-intensity sound wave soot blower, and gas after heat exchange enters the bag type dust collector for further dust removal and then enters the cyclone dust collector for final dust removal and then is discharged from a chimney; the frequency-adjustable sound wave frequency of the frequency-adjustable high-sound-intensity sound wave soot blower is 20-8000 Hz, and the sound pressure level of the sound wave output port is 150-190 dB.
The utility model discloses a metal dust of 1 mu m-50 mu m particle diameter is reunited to the first sound wave reunion device of setting on bag collector in to the flue gas, and the dust particle diameter after the reunion is more than 100 mu m, and the dust bag among the bag collector can effectively intercept big metal particles, utilizes self action of gravity to subside simultaneously with the recovery ash bucket of bag collector below, further recycle.
The sound wave frequency of the frequency-adjustable high sound intensity sound wave soot blower arranged on the air heat exchanger can be 20-8000 Hz, and the sound pressure level at the outlet of the horn structure can be 150-190 dB; the sound pressure level of the inside of the cloth bag under different frequencies can be 140 dB-190 dB; the effective descaling distance is more than 15 m; the dust on the surface of the cloth bag can be effectively removed, the existing common high-pressure pulse backflushing device is replaced for removing dust, and the service life of the cloth bag is prolonged.
The utility model provides a rotary hearth furnace flue gas comprehensive treatment system, wherein the high sound intensity sound wave descaling scope is wide, and the unblock is thorough, guarantees the stable operation of flue gas heat exchanger system, improves the heat transfer efficiency of heat transfer component; the metal dust is reunited in coordination with the sound waves, the recovery efficiency is improved, meanwhile, the accumulated dust of the cloth bag is effectively removed, the service life of the cloth bag is prolonged, and the cost is saved.
In order to better exert the advantages of the method, the utility model can be applied to smelting systems of steel plants and rotary hearth furnaces.
The utility model adopts the above technical scheme, following beneficial effect has:
1) the utility model overcomes the shortcomings of complex process, high cost and the like of the existing rotary hearth furnace flue gas treatment, and effectively solves the problems of easy blockage of a heat exchanger system, low metal recovery efficiency, overproof flue gas emission and the like through the high sound intensity sound wave technology.
2) The sound frequency of the frequency-adjustable high sound intensity sound wave device is 20 to 8000Hz, the sound pressure level is 150 to 190dB,
the effective descaling distance is more than 15m, the blockage removing efficiency is high, and the descaling is thorough.
3) The method has strong adaptability, wide applicability and good industrialization prospect;
4) the utility model discloses can promote about zinc powder recovery efficiency 30%. The use cost of the bag-type dust collector is about 50 percent.
Drawings
FIG. 1 is a schematic view of a rotary hearth furnace flue gas comprehensive treatment system provided in example 1;
FIG. 2 is a schematic view of a comprehensive treatment system for flue gas of a rotary hearth furnace provided in example 2;
FIG. 3 is a schematic view of a comprehensive treatment system for flue gas of a rotary hearth furnace provided in example 3;
in the above fig. 1-3, 1 is a rotary hearth furnace, 2 is a waste heat boiler, 3 is an air heat exchanger, 31 is a frequency-adjustable high sound intensity sound wave soot blower, 4 is a bag type dust collector, 41 is a dust removing filter bag, 42 is a first sound wave agglomeration device, 43 is a recovery hopper, 5 is a fan, 6 is a cyclone dust collector, 61 is a cyclone dust removing unit, 62 is a second sound wave agglomeration device, 63 is a dust hopper, and 7 is a chimney.
The specific implementation mode is as follows:
the present invention will be further described with reference to the following embodiments. It should be noted that, in the following embodiments, the selected model structure and calculation parameters are only used for explaining the present invention, but not for limiting the present invention, the spirit of the present invention and the scope of the appended claims are within the scope of protection of the present invention, and those skilled in the art are only right under the premise of non-invasive labor, and all belong to the scope of protection of the present invention.
Example 1
As shown in fig. 1, the present embodiment provides a comprehensive treatment system for flue gas of a rotary hearth furnace, including a rotary hearth furnace 1, a high-temperature flue gas outlet of the rotary hearth furnace 1 is connected with a waste heat boiler 2, an outlet of the waste heat boiler 2 is connected with an air heat exchanger 3, the air heat exchanger 3 is connected with a bag type dust collector 4, an outlet end of the bag type dust collector 4 is connected with a cyclone dust collector 6 through a pipeline, a fan 5 is arranged on the pipeline, and the cyclone dust collector 6 is connected with a chimney 7. In this embodiment, the high temperature flue gas that rotary hearth furnace 1 came out gets into exhaust-heat boiler 2 and carries out the heat transfer cooling, and the flue gas that exhaust-heat boiler 2 came out is further connected with air heat exchanger 3 and carries out the heat transfer, air heat exchanger 3 on install adjustable frequency high sound intensity sound wave soot blower 31, the sound wave delivery outlet of adjustable frequency high sound intensity sound wave soot blower (31) is just to the heat exchange element setting in air heat exchanger (3), the flue gas after the air heat exchanger cooling gets into bag collector 4 and gets rid of the metal dust, the gas after getting rid of the metal dust is sent into cyclone 6 through fan 5 and is discharged from chimney 7 after further removing dust.
In the embodiment, the frequency-adjustable high-sound-intensity sound wave soot blower 31 is arranged on the air heat exchanger 3, and the frequency-adjustable high-sound-intensity sound wave soot blower 31 can continuously act on the inside of the air heat exchanger 3, so that dust and scale are removed, and the blocking phenomenon in the long-term use process is prevented.
Example 2
In this embodiment, a further improvement is provided on the basis of the above embodiment 1, as shown in fig. 2, the bag-type dust collector 4 includes a dust collector body, a dust-removing filter bag 41 disposed inside the dust collector body, and a recycling hopper 43 disposed at the bottom of the dust collector body, an inlet of the bag-type dust collector 4 is disposed below the dust-removing filter bag 41 at the lower portion of the dust collector body, an outlet of the bag-type dust collector 4 is disposed above the dust-removing filter bag 41 at the upper portion of the dust collector body, a first sound wave reunion device 42 is disposed on the dust collector body, and a sound wave output end of the first sound wave reunion device 42 faces the inside of the dust. Through set up first sound wave reunion device 42 on bag collector 4, can reunite the grow through the dust particle in the sound wave with the superfine dust flue gas, and then better by the filtering of dust removal filter bag 41, effectively improved dust collection efficiency and dust removal effect.
Example 3
The embodiment is a further improvement on the basis of embodiment 2, and as shown in fig. 3, the cyclone dust collector 6 includes cyclone dust collecting units 61 arranged in multiple stages, a transition cavity is arranged between adjacent cyclone dust collecting units, and a second acoustic wave agglomeration device 62 is arranged on the transition cavity; an inlet of the cyclone dust collector 6 is arranged below the cyclone dust removing unit at the lowest end of the cyclone dust collector 6, an ash hopper 63 is arranged at the bottom end, and an outlet of the cyclone dust collector 6 is arranged at the top end. The collecting hopper (43) and the ash hopper (63) are both installed in a detachable mode, and are convenient to replace and clean at any time.
Utilize the processing that the converter flue gas was carried out to the comprehensive treatment system of rotary hearth furnace flue gas that this embodiment provided, the superfine dust flue gas through the 4 desorption of bag collector gets into cyclone 6, carry out dust removal processing through tertiary cyclone dust removal unit in this embodiment, set up second sound wave reunion device 62 between cyclone dust removal unit at different levels, through the dust removal effect of each level cyclone dust removal unit and the reunion effect of second sound wave reunion device, make the dust that gets into next stage cyclone dust removal unit more easily detached, discharge from chimney 7 behind the tertiary cyclone dust removal unit at last.
Utilize the utility model provides a rotary hearth furnace flue gas comprehensive treatment system carries out the processing of converter flue gas, high temperature zinciferous waste gas retrieves the heat energy of high temperature waste gas through exhaust-heat boiler about 1100 ℃ usually, and the heat passes through exhaust-heat boiler and produces superheated steam, and superheated steam is about 1.4MPa, 260 ℃, and the maximum recovery steam volume of boiler is 18 t/h, and normal recovery steam volume is 9 t/h. Meanwhile, after the temperature of the flue gas is reduced from 1100 ℃ to 550 ℃, the flue gas enters a flue gas air heat exchanger to continuously heat the combustion-supporting air of the rotary hearth furnace by using the waste heat of the waste gas, so that the combustion-supporting air of the rotary hearth furnace is heated to 300 ℃, and the heat efficiency of the rotary hearth furnace is improved. Two frequency-adjustable high-sound-intensity sound wave soot blowers which are respectively arranged on two sides of the air heat exchanger are operated intermittently and periodically, so that dirt and blockage on the inner surface of the air heat exchanger are effectively removed.
After flue gas discharged from the bottom of the air heat exchanger enters a bag type dust collector for dust removal, continuous work is carried out through a first sound wave agglomeration device, particles with the particle size of 1-50 microns are agglomerated into large particles with the particle size of more than 100 microns, and the large particles are filtered to a collection hopper at the lower end through a dust removal filter bag; the sound field of 150 dB-190 dB generated by the bag type dust collector bin effectively clears away the dust on the dust collection filter bag, so that the dust removal work of a high-voltage pulse device commonly used at present is avoided, the cost is saved by about 30%, and the service life of the cloth bag is prolonged by about 2 times.
The flue gas containing the ultrafine dust is sucked into a cyclone dust collector by a fan, and the dust with the particle size of 20-500 mu m is removed by a primary cyclone dust collection unit; removing dust with the particle size of 15-30 mu m by a secondary cyclone dust removal unit; the third-stage cyclone dust removal unit removes dust with the particle size of 1-15 mu m, and the second sound wave agglomeration device adopts continuous work and periodic work to agglomerate particles with the particle size of 1-5 mu m; the dust content of the treated smoke is 5mg/Nm3The following; meeting the requirement of ultra-low emission. Under the action of gravity, the smoke dust removed by the three-stage cyclone dust removal unit and dust particles separated from the smoke gas flow are collected by an ash hopper arranged at the lower part and then discharged by a conveyor for recycling.
Claims (9)
1. The utility model provides a comprehensive treatment system of rotary hearth furnace flue gas, its characterized in that, includes rotary hearth furnace (1), and rotary hearth furnace (1) high temperature exhanst gas outlet connects exhaust-heat boiler (2), and the exit linkage air heat exchanger (3) of exhaust-heat boiler (2), bag collector (4) are connected in air heat exchanger (3), and the exit end of bag collector (4) passes through pipe connection cyclone (6), and chimney (7) are connected in cyclone (6).
2. The rotary hearth furnace flue gas comprehensive treatment system according to claim 1, wherein the air heat exchanger (3) is provided with a frequency-adjustable high sound intensity sound wave soot blower (31), and a sound wave output port of the frequency-adjustable high sound intensity sound wave soot blower (31) is arranged opposite to a heat exchange element in the air heat exchanger (3).
3. The rotary hearth furnace flue gas comprehensive treatment system according to claim 1 or 2, wherein the bag type dust collector (4) comprises a dust collector body, a dust collection filter bag (41) arranged inside the dust collector body and a recovery collecting hopper (43) arranged at the bottom of the dust collector body.
4. The comprehensive treatment system for the flue gas of the rotary hearth furnace according to claim 3, wherein the dust remover body is provided with a first sound wave agglomeration device (42), and the sound wave output end of the first sound wave agglomeration device (42) is arranged right opposite to the interior of the dust remover body.
5. The comprehensive treatment system for the flue gas of the rotary hearth furnace according to claim 1, wherein a fan (5) is arranged on a pipeline connecting the bag type dust collector (4) and the cyclone dust collector (6).
6. The rotary hearth furnace flue gas comprehensive treatment system according to claim 1, wherein the cyclone dust collector (6) comprises cyclone dust collection units (61) arranged in multiple stages, a transition cavity is arranged between adjacent cyclone dust collection units, and a second sound wave agglomeration device (62) is arranged on the transition cavity; an inlet is arranged below the cyclone ash removal unit at the lowest end of the cyclone dust collector (6), an ash hopper (63) is arranged at the bottom end, and an outlet is arranged at the top end.
7. The comprehensive treatment system for the flue gas of the rotary hearth furnace according to claim 3, wherein the return collecting hopper (43) is detachably arranged at the bottom of the dust remover body.
8. The comprehensive treatment system for the flue gas of the rotary hearth furnace according to claim 6, wherein the ash hopper (63) is detachably connected with the bottom of the cyclone dust collector (6).
9. The comprehensive treatment system for the flue gas of the rotary hearth furnace according to claim 6, wherein the multistage cyclone dust removal units (61) comprise three stages of cyclone dust removal units arranged from bottom to top, wherein the particle size of the removed dust of the first stage cyclone dust removal unit is 20-500 μm, the particle size of the removed dust of the second stage cyclone dust removal unit is 15-30 μm, and the particle size of the removed dust of the third stage cyclone dust removal unit is 1-15 μm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110986605A (en) * | 2019-11-30 | 2020-04-10 | 南京常荣声学股份有限公司 | Comprehensive treatment system and method for flue gas of rotary hearth furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110986605A (en) * | 2019-11-30 | 2020-04-10 | 南京常荣声学股份有限公司 | Comprehensive treatment system and method for flue gas of rotary hearth furnace |
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