CN112877499A - Converter flue gas treatment system based on dry dedusting and operation method thereof - Google Patents
Converter flue gas treatment system based on dry dedusting and operation method thereof Download PDFInfo
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- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
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Abstract
The invention relates to a converter flue gas treatment system based on dry dedusting, which comprises a converter flue gas hood, a vaporization cooling flue, a waste heat recovery mechanism, a main path dedusting mechanism and a switching station which are sequentially connected through a flue gas pipeline, wherein a flue gas outlet of the switching station is respectively connected with a diffusing chimney and a gas tank, and the main path dedusting mechanism comprises a sound wave agglomerator and a ceramic fiber filter which are sequentially arranged along the flow direction of flue gas. In addition, the method also relates to an operation method of the converter flue gas treatment system. The invention adopts the combination of the acoustic agglomeration device and the ceramic fiber filter to carry out fine dust removal, can effectively improve the fine dust removal effect on the flue gas, and can stably control the smoke concentration of the discharged flue gas to be 10mg/m3In addition, the ultra-low emission of the converter in one-time dust removal is realized, and the environmental protection of the converter flue gas treatment system is improved.
Description
Technical Field
The invention belongs to the technical field of converter steelmaking, and particularly relates to a converter flue gas treatment system based on dry dedusting and an operation method thereof.
Background
Converter steelmaking is the most predominant steelmaking mode at present, oxygen decarburization is one of the most predominant converter steelmaking processes, and in the oxygen decarburization process, a converter generates a large amount of flue gas, and the main component of the flue gas is CO (accounting for about 66 percent)％)、CO2(about 16%) and N2(about 17%) with a small amount of O2And Ar. Due to the large amount of CO contained in the converter flue gas, the converter flue gas is also called converter gas, and has the characteristics of flammability and explosiveness. The initial temperature of the converter gas is about 1600 ℃, the converter gas contains a large amount of dust generated by steel making, and the content of the dust is about 80-150 g/m3The main components of the dust are FeO, Fe, CaO, MnO and SiO2And C, etc.
At present, two methods are most common for treating converter flue gas. The first one is OG process, also called wet dedusting, which includes recovering afterheat of converter fume at 1600 deg.c via vaporizing cold area, spraying great amount of water to cool the fume to 900 deg.c, coarse dedusting and explosion prevention, and further fine dedusting with Venturi tube to recover high heat value and low oxygen content gas, ignite and exhaust low heat value or high oxygen content gas. The second method is dry dedusting, mainly including LT method and DDS method, and its main process is to make converter flue gas at about 1600 deg.C pass through vaporization cold zone flue to recover waste heat, spray water and cool when the temperature of flue gas is reduced to about 900 deg.C, then pass through electrostatic dust collector to make fine dedusting, then recover high-quality coal gas, ignite low-quality coal gas and exhaust. Compared with wet dust removal, the dry dust removal has better dust removal effect, less water spray and no need of sewage and sludge treatment, so in recent years, newly built converter systems mostly adopt dry dust removal systems, and a plurality of steel mills change the existing wet dust removal systems into the dry dust removal systems, and the dry dust removal systems become the most widely applied converter flue gas treatment systems at present.
Although the dust removal effect of the converter dry dust removal system is better than that of the converter wet dust removal system, the following disadvantages still exist:
(1) in the existing dry dedusting system, electrostatic dedusting is adopted for fine dedusting instead of filtering dedusting, and the smoke dust emission concentration of the existing dry dedusting system with the best effect can only reach 15mg/m3In addition, most of dry dedusting can be stabilized at 20mg/m3Within the range, the requirement of ultralow emission of steel can not be met (the emission limit value of the primary dust removal of the converter is 10 mg/m)3)；
(2) The dry dedusting system sprays water mist in the evaporative cooler to lead the flue gas to be about 250 ℃ from about 900 ℃, so that the waste heat (900-250 ℃) of the middle temperature section of the flue gas of the converter is completely wasted, and simultaneously, a large amount of water and steam are wasted due to the water mist spraying;
(3) in general, direct modification of a dry dedusting system often seriously affects steel-making production, usually causes long-time production stop, brings huge economic loss to enterprises, and is forbidden by most of the enterprises.
Disclosure of Invention
The invention relates to a converter flue gas treatment system based on dry dedusting and an operation method thereof, which can at least solve part of defects in the prior art.
The invention relates to a converter flue gas treatment system based on dry dedusting, which comprises a converter flue gas hood, a vaporization cooling flue, a waste heat recovery mechanism, a main path dedusting mechanism and a switching station which are sequentially connected through a flue gas pipeline, wherein a flue gas outlet of the switching station is respectively connected with a diffusing chimney and a gas tank, and the main path dedusting mechanism comprises a sound wave agglomerator and a ceramic fiber filter which are sequentially arranged along the flow direction of flue gas.
As one embodiment, the converter flue gas treatment system based on dry dedusting further comprises a dedusting bypass, wherein one end of the dedusting bypass is connected to a flue gas pipeline between the waste heat recovery mechanism and the main dedusting mechanism, and the other end of the dedusting bypass is connected to a flue gas pipeline between the main dedusting mechanism and the switching station; and a bypass dust removing mechanism and a first bypass control valve are arranged on the dust removing bypass.
In one embodiment, the bypass dust removal mechanism comprises an electrostatic precipitator.
In one embodiment, a first main control valve is arranged on a flue gas pipeline between the acoustic agglomeration device and a bypass point at the inlet end of the dedusting bypass.
As one embodiment, the flue gas pipeline between the evaporation cooling flue and the waste heat recovery mechanism comprises a mixed flow pipe body, and a swirler which can enable the flue gas to generate rotational flow is arranged in the mixed flow pipe body.
In one embodiment, the cyclone includes a flow guide pipe and swirl vanes arranged at an outlet end of the flow guide pipe, and the mixed flow pipe is fixed in the mixed flow pipe through a mounting bracket and encloses a flue gas circulation annular cavity with an inner wall of the mixed flow pipe.
In one embodiment, the swirler is a ceramic component.
As one embodiment, the converter flue gas treatment system based on dry dedusting further comprises a cooling bypass, wherein one end of the cooling bypass is connected to a flue gas pipeline between the vaporization cooling flue and the waste heat recovery mechanism, and the other end of the cooling bypass is connected to a flue gas pipeline between the waste heat recovery mechanism and the main dedusting mechanism; and an evaporative cooler and a second bypass control valve are arranged on the cooling bypass.
In one embodiment, a second main path control valve is arranged on a flue gas pipeline between the waste heat recovery mechanism and a bypass point at the inlet end of the cooling bypass.
The invention also relates to an operation method of the converter flue gas treatment system, which comprises the following steps:
during the normal production period of the converter, converter smoke inhaled by a converter smoke hood is sequentially treated by a vaporization cooling flue, a waste heat recovery mechanism, a sound wave agglomerator and a ceramic fiber filter, whether the converter smoke meets the coal gas recovery condition is judged according to smoke components, when the converter smoke meets the coal gas recovery condition, the converter smoke enters a gas chamber through a switching station, and when the converter smoke does not meet the coal gas recovery condition, the converter smoke is discharged through a diffusing chimney through the switching station.
The invention has at least the following beneficial effects:
the invention adopts the combination of the acoustic agglomeration device and the ceramic fiber filter to carry out fine dust removal, can effectively improve the fine dust removal effect on the flue gas, and can stably control the smoke concentration of the discharged flue gas to be 10mg/m3In addition, the ultra-low emission of the converter in one-time dust removal is realized, and the environmental protection of the converter flue gas treatment system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a converter flue gas treatment system according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a mixed flow pipe provided in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a converter flue gas treatment system based on dry dedusting, including a converter flue gas hood 2, a vaporization cooling flue 3, a waste heat recovery mechanism 5, a main dedusting mechanism and a switching station 9, which are sequentially connected through a flue gas pipeline, wherein a flue gas outlet of the switching station 9 is respectively connected to a diffusion chimney 11 and a gas chamber 10, and the main dedusting mechanism includes a sound wave agglomerator 8 and a ceramic fiber filter 7, which are sequentially arranged along a flue gas flowing direction.
The converter smoke hood 2 is conventional equipment in the field, is covered on a converter and is used for collecting smoke generated in the smelting process of the converter, a smoke outlet of the converter smoke hood 2 is connected with the evaporative cooling flue 3, and the collected smoke can enter the evaporative cooling flue 3. In the vaporization cooling flue 3, the temperature of the flue gas is reduced from about 1600 ℃ to about 900 ℃ through radiation heat exchange energy, and the recovery and utilization of the waste heat of the high-temperature section of the converter flue gas are realized.
The sound wave agglomerator 8 makes the dust particles with different sizes generate vibration with different speeds and different frequencies to collide through the vibration of sound waves, and the collided dust is agglomerated together, so as to reduce the number of the dust and increase the granularity of the dust, so that the dust is easier to settle or be removed through a dust remover in the subsequent process; the acoustic agglomeration apparatus 8 is a conventional apparatus, and generally includes an acoustic wave generating device and an acoustic wave amplifying device, and the detailed structure thereof is not described herein.
The ceramic fiber filter 7 mainly comprises a filter box and a ceramic fiber filter tube arranged in the filter box, the ceramic fiber filter tube is used as a core device of the ceramic fiber filter tube, is mainly formed by pressing low-density porous ceramic fibers, can resist the temperature of more than 500 ℃, has good filtering performance, has the dust removal efficiency of more than 99 percent, and can reduce the smoke concentration to 10mg/m after smoke is filtered by the ceramic fiber filter 73The following. In order to achieve better dust removal and ash removal effects, the flue gas flows in from the lower part and flows out from the upper part of the ceramic fiber filter 7; an ash discharge system is arranged below the ceramic fiber filter 7 and used for discharging dust filtered by the ceramic fiber filter 7, and a valve and an air locking device are arranged on the ash discharge system in order to prevent air from entering a system pipeline during ash discharge. In order to ensure the filtering effect of the ceramic fiber filter 7 and avoid the excessive resistance loss of the filtering, the ceramic fiber filter 7 is back blown by a back blowing system at intervals according to the detection result of the filtering pressure, so that the dust adhered to the filtering surface falls into the dust discharging system below.
The converter flue gas treatment system provided by the embodiment adopts the combination of the acoustic agglomeration device 8 and the ceramic fiber filter 7 to carry out fine dust removal, so that the fine dust removal effect on flue gas can be effectively improved, and the smoke concentration of the discharged flue gas can be stably controlled at 10mg/m3In addition, the ultra-low emission of the converter in one-time dust removal is realized, and the environmental protection of the converter flue gas treatment system is improved.
Further, as shown in fig. 1, the converter flue gas treatment system further includes a dust removal bypass, one end of the dust removal bypass is connected to the flue gas pipeline between the waste heat recovery mechanism 5 and the main path dust removal mechanism, and the other end of the dust removal bypass is connected to the flue gas pipeline between the main path dust removal mechanism and the switching station 9; and a bypass dust removing mechanism and a first bypass control valve 18 are arranged on the dust removing bypass. Optionally, the first bypass control valve 18 is a butterfly valve; preferably, the first bypass control valves 18 are respectively disposed at two sides of the bypass dust removing mechanism, and the outlet side first bypass control valve 18 can prevent the flue gas flowing in the main dust removing mechanism from reversely leaping into the dust removing bypass. In one embodiment, the bypass dust removal mechanism comprises an electrostatic precipitator 6.
Based on above-mentioned structure, can confirm whether the flue gas circulates through the bypass that removes dust according to operating condition, for example when flue gas volume is great through main road dust removal mechanism and bypass dust removal mechanism simultaneous working. When the main dust removal mechanism and the bypass dust removal mechanism work simultaneously, after two paths of purified flue gas are mixed, the purified flue gas at the outlet of the main dust removal mechanism can dilute the purified flue gas at the outlet of the bypass dust removal mechanism, so that the condition that the concentration of the purified flue gas at the outlet of the bypass dust removal mechanism does not reach the standard is prevented.
Further, as shown in fig. 1, a first main path control valve is arranged on a flue gas pipeline between the acoustic agglomeration device 8 and a bypass point at the inlet end of the dust removal bypass. The main dust removal mechanism and the bypass dust removal mechanism can be switched to work, for example, when the main dust removal mechanism breaks down or needs to be overhauled, the bypass dust removal mechanism is put into work, and the normal operation of the system can be ensured. Similarly, the two sides of the main path dust removal mechanism are respectively provided with the first main path control valves, and the first main path control valves on the outlet sides can prevent smoke circulating in the dust removal bypass from reversely leaping into the main path dust removal mechanism. The first main control valve may employ a valve set of a butterfly valve 171 and a blind plate valve 172.
In one embodiment, the waste heat recovery mechanism 5 includes a waste heat boiler 5, and further preferably, a convection type waste heat boiler 5 is used, and in another embodiment, it is also possible to use a heat exchange device such as a convection type heat exchanger. The waste heat recovery mechanism 5 is used for recovering the waste heat of the medium-temperature section of the converter flue gas, and preferably can reduce the temperature of the flue gas from about 900 ℃ to about 250 ℃; in the embodiment, the waste heat boiler 5 is adopted, and the temperature of the outlet flue gas of the waste heat boiler 5 is controlled within the range of 200-300 ℃. The waste heat boiler 5 is generally arranged vertically, and high-temperature flue gas enters from an upper opening and exits from a lower opening, so that waste heat absorption and dust discharge are facilitated; the waste heat boiler 5 can be divided into a high-temperature section, a medium-temperature section and a low-temperature section from top to bottom, can realize the cascade utilization of the flue gas waste heat of the converter, and achieves the purpose of economically and efficiently recovering the flue gas waste heat of the medium-temperature section; an ash discharge system is arranged below the outlet of the waste heat boiler 5 and used for discharging dust deposited in the waste heat boiler 5, and a valve and an air locking device are arranged on the ash discharge system to ensure that air cannot enter the boiler when ash is discharged; the waste heat boiler 5 is internally provided with an ash removal device which can regularly clean dust adhered to the heat exchange wall surface; the waste heat boiler 5 is internally provided with 4-8 explosion-proof valves, and can play a role in emergency explosion venting when the pressure is too high.
Further optimizing the converter flue gas treatment system, as shown in fig. 1 and 2, a flue gas pipeline between the vaporization cooling flue 3 and the waste heat recovery mechanism 5 includes a mixed flow pipe body 12, and a cyclone capable of making flue gas generate rotational flow is arranged in the mixed flow pipe body 12. The cyclone is arranged in the pipeline in front of the waste heat recovery mechanism 5, so that the passing converter flue gas generates cyclone, the contact collision probability of the coal gas components of the flue gas and oxygen (including the oxygen in the flue gas and the residual oxygen in the pipeline) can be increased (especially the residual oxygen in the entrainment pipeline can be well induced based on the central negative pressure effect of the cyclone), and the oxygen contained in the flue gas and the residual oxygen in the pipeline can be quickly consumed due to the fact that the converter coal gas with the temperature above the self-ignition point (605 ℃) can quickly generate oxidation reaction when being contacted with the oxygen and explosion caused by the mixing of the coal gas and the oxygen is avoided, and the possibility of explosion caused by the mixing of the oxygen and the oxygen when the temperature of the coal gas is reduced to be below the self-ignition point is remarkably reduced; and the cyclone effect of the flue gas is utilized, a certain flue gas dust removal effect can be achieved, the situation that the waste heat recovery mechanism 5 is blocked by dust is reduced, and the workload of a subsequent dust removal mechanism is reduced.
The cyclone is generally formed by arranging a plurality of cyclone vanes 121 in a ring shape, and the plate surfaces of the cyclone vanes 121 have an inclination angle with respect to the flow direction of the flue gas. Preferably, the cyclone is a ceramic device, and has good high temperature resistance, so that the cyclone can stably and reliably work for a long time. In one embodiment, the swirl vanes 121 are mounted directly on the inner wall of the mixing tube body 12. In another embodiment, the cyclone includes a flow guide tube and a first rotational flow blade set disposed at an outlet end of the flow guide tube, the flow guide tube is fixed in the mixed flow tube body 12 through a mounting bracket and forms a flue gas circulation annular chamber with the inner wall of the mixed flow tube body 12 in an enclosing manner, and a second rotational flow blade set is disposed at an outlet end of the flue gas circulation annular chamber; based on this design, can form two strands of whirl flue gases in mixed flow body 12, can not only improve the consumption effect to remaining oxygen in the pipeline, can improve the mixed effect of converter flue gas self moreover, further improve the consumption effect to oxygen in the flue gas, the dust removal effect is also better.
In a further preferred scheme, a powder spraying device can be arranged on the mixed flow pipe body 12 and used for spraying carbon powder/coke powder into the flue gas circulation annular cavity, so that the oxygen consumption effect can be remarkably improved, especially, the sprayed carbon powder/coke powder can be fully mixed with the flue gas based on the rotational flow effect of the second rotational flow blade group, and the oxygen removal effect is good. The powder spraying device can comprise a plurality of spray guns which are arranged around the circumference of the mixed flow pipe body 12.
Correspondingly, an ash discharge port can be arranged at the bottom of the pipeline at the outlet side of the cyclone so as to discharge accumulated ash in the pipeline timely.
Further optimizing the converter flue gas treatment system, as shown in fig. 1, the converter flue gas treatment system based on dry dedusting further comprises a cooling bypass, wherein one end of the cooling bypass is connected to a flue gas pipeline between the vaporization cooling flue 3 and the waste heat recovery mechanism 5, and the other end of the cooling bypass is connected to a flue gas pipeline between the waste heat recovery mechanism 5 and the main dedusting mechanism; the cooling bypass is provided with an evaporative cooler 4 and a second bypass control valve 14. Wherein, the outlet side of the vaporization cooling flue 3 can be provided with a three-way pipe 13 for connecting the cooling main pipe and the cooling bypass, and the three-way pipe 13 can adopt a water-cooling three-way pipe or a heat-insulating three-way pipe to ensure that the three-way pipe can bear the high temperature of the flue gas about 1000 ℃ for a long time and can bear the high temperature of the flue gas above 1200 ℃ for a short time. The three-way pipe 13 is generally arranged at a certain distance from the waste heat recovery mechanism 5 and can be connected with the waste heat recovery mechanism through a water-cooling pipeline or a heat-insulating pipeline under the limitation of equipment arrangement; the cooling bypass is preferably a water-cooled or heat-insulated pipe. In one embodiment, the water-cooling pipeline comprises a metal pipeline and a ring of water-cooling pipes wound outside the metal pipeline; the heat insulation pipeline is made of high-temperature resistant metal materials, and heat insulation materials are sprayed on the inner wall of the pipeline.
The second bypass control valve 14 is preferably a high temperature resistant valve that can be automatically opened and closed, for example, a high temperature resistant butterfly valve; the bypass valve can bear the high temperature of about 1000 ℃ for a long time and can bear the high temperature of over 1200 ℃ for a short time. Similarly, the second bypass control valves 14 are respectively disposed on two sides of the evaporative cooler 4, the outlet side second bypass control valve 14 can prevent the smoke circulating in the cooling main path from bouncing back into the cooling bypass, and the outlet side second bypass control valve 14 can adopt a common butterfly valve.
Further, as shown in fig. 1, a second main control valve is arranged on the flue gas pipeline between the waste heat recovery mechanism 5 and the bypass point of the inlet end of the cooling bypass. Based on the design, the flue gas at the outlet of the vaporization cooling flue 3 can be switched between two flue gas flow directions, and when the waste heat recovery mechanism 5 is abnormal or needs to be overhauled, the flue gas is treated by the cooling bypass, so that the normal operation of the system is ensured, and the problems of production halt of the converter and the like are avoided. In addition, the trend of the flue gas can be controlled according to the generation period of the flue gas, for example, in the initial stage of converter blowing, the flue gas temperature is relatively low, the dust content is relatively high, the part of the flue gas can be controlled to be processed by the cooling bypass, the situation that the waste heat recovery mechanism 5 is blocked can be effectively reduced, or the service time of the waste heat recovery mechanism 5 is prolonged/the maintenance frequency of the waste heat recovery mechanism 5 is reduced, and in the middle stage and the later stage of converter blowing, the generated flue gas is controlled to be processed by the waste heat recovery mechanism 5, so that the heat of the flue gas of the converter can be fully recovered.
In one embodiment, the second main path control valve includes a high-temperature butterfly valve 151 and a high-temperature blind valve 152, preferably an automatic control valve capable of automatically opening and closing; the valves can bear the high temperature of about 1000 ℃ for a long time and can bear the high temperature of over 1200 ℃ for a short time. Similarly, the second main path control valves are respectively disposed on two sides of the waste heat recovery mechanism 5, the outlet side second main path control valve can prevent the smoke circulating in the cooling bypass from reversely leaping into the cooling main path, and the outlet side second main path control valve can adopt a combination of a common butterfly valve 153 and a common blind plate valve 154.
The system is suitable for the reconstruction of the existing converter flue gas treatment system, namely, on the basis of the structure of the existing vaporization cooling flue 3-evaporative cooler 4-electrostatic dust collector 6, a three-way pipe 13 is arranged on the outlet side of the vaporization cooling flue 3, one end of a pipeline where the waste heat recovery mechanism 5 is arranged is connected to the three-way pipe, and the other end of the pipeline is connected to a flue gas pipeline on the outlet side of the evaporative cooler 4; and/or a three-way pipe is arranged on the outlet side of the evaporative cooler 4, one end of a pipeline where the main dust removing mechanism is arranged is connected to the three-way pipe, and the other end of the pipeline is connected to a flue gas pipeline on the outlet side of the electrostatic dust remover 6. The transformation mode has convenient operation and low transformation cost, thereby having popularization value.
The embodiment of the invention also relates to an operation method of the converter flue gas treatment system, which comprises the following steps:
during the normal production period of the converter, converter smoke inhaled by a converter smoke hood 2 sequentially passes through a vaporization cooling flue 3, a waste heat recovery mechanism 5, a sound wave agglomerator 8 and a ceramic fiber filter 7 to be processed, and then is sent to a switching station 9 through a fan 16, whether the converter smoke meets the coal gas recovery condition is judged according to smoke components, when the converter smoke meets the coal gas recovery condition, the converter smoke enters a coal gas cabinet 10 through the switching station 9, and when the converter smoke does not meet the coal gas recovery condition, the converter smoke is discharged through a diffusing chimney 11 through the switching station 9.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a converter flue gas processing system based on dry process removes dust, includes converter petticoat pipe, vaporization cooling flue, waste heat recovery mechanism, main road dust removal mechanism and the switching station that connect gradually through flue gas pipeline, the exhanst gas outlet of switching station connects respectively and diffuses chimney and gas chamber, its characterized in that: the main dust removal mechanism comprises an acoustic wave agglomerator and a ceramic fiber filter which are sequentially arranged along the smoke flowing direction.
2. The dry dedusting-based converter flue gas treatment system as recited in claim 1, wherein: the main path dust removal mechanism is connected with the switching station through a main path dust removal mechanism, and the switching station is connected with the waste heat recovery mechanism through a main path dust removal mechanism; and a bypass dust removing mechanism and a first bypass control valve are arranged on the dust removing bypass.
3. The dry dedusting-based converter flue gas treatment system as recited in claim 2, wherein: the bypass dust removal mechanism comprises an electrostatic dust collector.
4. The dry dedusting-based converter flue gas treatment system as recited in claim 2, wherein: and a first main path control valve is arranged on a flue gas pipeline between the acoustic agglomeration device and a bypass point at the inlet end of the dust removal bypass.
5. The dry dedusting-based converter flue gas treatment system as recited in claim 1, wherein: the flue gas pipeline between the vaporization cooling flue and the waste heat recovery mechanism comprises a mixed flow pipe body, and a swirler which can enable flue gas to generate rotational flow is arranged in the mixed flow pipe body.
6. The dry dedusting-based converter flue gas treatment system as recited in claim 5, wherein: the swirler includes the honeycomb duct and arranges in the first whirl blading of honeycomb duct exit end, the honeycomb duct is fixed in through the installing support in the mixed flow body and with enclose between the inner wall of mixed flow body and establish and be formed with flue gas circulation ring chamber, in the exit end of flue gas circulation ring chamber has arranged second whirl blading.
7. The dry dedusting-based converter flue gas treatment system as recited in claim 5, wherein: the swirler is a ceramic device.
8. The dry dedusting-based converter flue gas treatment system as recited in claim 1, wherein: the main dust removal mechanism is connected with the main dust removal mechanism through a main pipe, and the main dust removal mechanism is connected with the main dust removal mechanism through a main pipe; and an evaporative cooler and a second bypass control valve are arranged on the cooling bypass.
9. The dry dedusting-based converter flue gas treatment system as recited in claim 8, wherein: and a second main path control valve is arranged on a flue gas pipeline between the waste heat recovery mechanism and the bypass point at the inlet end of the cooling bypass.
10. The method of operating a converter flue gas treatment system according to any one of claims 1 to 9, comprising:
during the normal production period of the converter, converter smoke inhaled by a converter smoke hood is sequentially treated by a vaporization cooling flue, a waste heat recovery mechanism, a sound wave agglomerator and a ceramic fiber filter, whether the converter smoke meets the coal gas recovery condition is judged according to smoke components, when the converter smoke meets the coal gas recovery condition, the converter smoke enters a gas chamber through a switching station, and when the converter smoke does not meet the coal gas recovery condition, the converter smoke is discharged through a diffusing chimney through the switching station.
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| CN113560041A (en) * | 2021-08-18 | 2021-10-29 | 宁夏森源重工设备有限公司 | Ore smelting furnace raw material sintering dry dedusting system and use method thereof |
| CN114606358A (en) * | 2022-03-17 | 2022-06-10 | 浙江伯益环境科技有限公司 | Steelmaking converter flue gas waste heat recovery and dry dedusting system |
| CN115491458A (en) * | 2021-06-19 | 2022-12-20 | 上海梅山钢铁股份有限公司 | Method for setting operating time of converter sound wave discrete descaling unit |
| CN116673126A (en) * | 2023-08-03 | 2023-09-01 | 南京恒瑞环保科技有限公司 | Explosion-proof dry electrostatic precipitator and filter cartridge precipitator combined dust removal system and method |
| CN116907234A (en) * | 2023-09-11 | 2023-10-20 | 北京博鹏中科环保科技有限公司 | Dust removal mode switching system |
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