CN112877499B - 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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- CN112877499B CN112877499B CN202110210216.0A CN202110210216A CN112877499B CN 112877499 B CN112877499 B CN 112877499B CN 202110210216 A CN202110210216 A CN 202110210216A CN 112877499 B CN112877499 B CN 112877499B
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- C—CHEMISTRY; METALLURGY
- 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
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 way 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 cabinet, and the main way dedusting mechanism comprises a sound wave agglomerator and a ceramic fiber filter which are sequentially arranged along the flue gas circulation direction. In addition, the invention also relates to an operation method of the converter flue gas treatment system. The invention adopts the combination of the acoustic wave agglomerator and the ceramic fiber filter to carry out fine dust removal, can effectively improve the fine dust removal effect on the smoke, and can stably control the smoke concentration of the discharged smoke to 10mg/m 3 In the method, the ultra-low emission of primary dust removal of the converter is realized, and the environmental protection of a 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 current most dominant steelmaking mode, oxygen blowing decarburization is one of the most dominant processes of converter steelmaking, and in the oxygen blowing decarburization process, a great amount of flue gas is generated by the converter, and the main components of the flue gas are CO (accounting for about 66 percent) and CO 2 (about 16%) and N 2 About 17%, also small amounts of O 2 And Ar. Since the converter gas contains a large amount of CO, the converter gas is also called converter gas, and has a characteristic of inflammability and explosiveness. The initial temperature of the converter gas is about 1600 ℃ generally, and the converter gas contains a large amount of dust generated by steelmaking, and the dust content is about 80-150 g/m 3 The main component of the dust is FeO, fe, caO, mnO, siO 2 And C, etc.
There are two most common methods for treating converter flue gas. The first is OG method, also called wet dust removal, the main flow is to make the converter flue gas around 1600 deg.C pass through the flue of the vaporization cold zone to make waste heat recovery, and when the flue gas temperature is reduced to around 900 deg.C, a large amount of water cooling is sprayed, at the same time, the coarse dust removal and explosion-proof action are achieved, and further, after the venturi tube is used for spraying water to fine dust removal, the gas with high heat value and low oxygen content is recovered, and the gas with low heat value or high oxygen content is ignited and emptied. The second is dry dedusting, mainly comprising LT method and DDS method, the main flow is to recycle waste heat of converter smoke gas at 1600 deg.C through the flue of vaporization cold area, spray water mist to cool when the temperature of smoke gas is reduced to 900 deg.C, then fine dedusting through electrostatic precipitator, recycling high quality gas, igniting low quality gas and evacuating. Compared with wet dedusting, the dry dedusting has better dedusting effect, less water spraying and no sewage and sludge treatment, so that in recent years, newly-built converter systems mostly adopt dry dedusting systems, and many steel factories reform the existing wet dedusting systems into the dry dedusting systems, and the dry dedusting systems become the converter flue gas treatment systems which are most widely applied at present.
Although the dust removal effect of the converter dry dust removal system is better than that of the wet dust removal system, the following defects still exist:
(1) In the existing dry dust removing system, electrostatic dust removing rather than filtering type dust removing is adopted for fine dust removing, and the smoke dust emission concentration of the dry dust removing system with the best effect at present can only reach 15mg/m 3 Within that, most dry dedusting can only be stabilized at 20mg/m 3 Within the limit, the requirement of ultra-low emission of steel cannot be met (the limit value of the primary dedusting emission of the converter is 10 mg/m) 3 )；
(2) The dry dedusting system sprays water mist in the evaporative cooler to enable the flue gas to be about 250 ℃ from about 900 ℃ to about 250 ℃ so that the waste heat (900-250 ℃) of the temperature section in the flue gas of the converter is completely wasted, and meanwhile, a large amount of water and steam are wasted by spraying the water mist;
(3) In general, the direct modification of the dry dedusting system often seriously affects the steelmaking production, generally causes long production stoppage, and brings huge economic loss to enterprises, so that most enterprises are prohibitive.
Disclosure of Invention
The invention relates to a converter flue gas treatment system based on dry dedusting and an operation method thereof, which at least can 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 way 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 cabinet, and the main way dedusting mechanism comprises a sound wave agglomerator and a ceramic fiber filter which are sequentially arranged along the flue gas circulation direction.
As one of the implementation modes, the converter flue gas treatment system based on dry dedusting further comprises a dedusting bypass, one end of the dedusting bypass is connected with 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 with a flue gas pipeline between the main dedusting mechanism and the switching station; and the dust removing bypass is provided with a bypass dust removing mechanism and a first bypass control valve.
As one embodiment, the bypass dust removal mechanism comprises an electrostatic precipitator.
As one implementation mode, a first main path control valve is arranged on a flue gas pipeline between the acoustic wave agglomerator and a bypass joint at the inlet end of the dust removal bypass.
As one of the embodiments, the flue gas pipeline between the vaporization cooling flue and the waste heat recovery mechanism comprises a mixed flow pipe body, and a cyclone capable of generating a cyclone for flue gas is arranged in the mixed flow pipe body.
As one of the implementation modes, the cyclone comprises a flow guide pipe and cyclone blades arranged at the outlet end of the flow guide pipe, and the mixed flow pipe is fixed in the mixed flow pipe through a mounting bracket and a smoke circulation annular cavity is formed between the mixed flow pipe and the inner wall of the mixed flow pipe in a surrounding mode.
As one embodiment, the cyclone is a ceramic device.
As one of the implementation modes, the converter flue gas treatment system based on dry dedusting further comprises a cooling bypass, wherein one end of the cooling bypass is connected with 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 with a flue gas pipeline between the waste heat recovery mechanism and the main path dedusting mechanism; an evaporative cooler and a second bypass control valve are arranged on the cooling bypass.
As one of the implementation modes, a second main path control valve is arranged on the flue gas pipeline between the waste heat recovery mechanism and the bypass connection point of 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 normal production of the converter, after the converter smoke sucked by the converter smoke hood is sequentially processed by the evaporative cooling flue, the waste heat recovery mechanism, the sonic agglomerator and the ceramic fiber filter, judging whether the smoke is in accordance with the gas recovery condition according to the smoke components, when the smoke is in accordance with the gas recovery condition, enabling the smoke to enter the gas cabinet through the switching station, and when the smoke is not in accordance with the gas recovery condition, enabling the smoke to be discharged through the diffusing chimney through the switching station.
The invention has at least the following beneficial effects:
the invention adopts the combination of the acoustic wave agglomerator and the ceramic fiber filter to carry out fine dust removal, can effectively improve the fine dust removal effect on the smoke, and can stably control the smoke concentration of the discharged smoke to 10mg/m 3 In the method, the ultra-low emission of primary dust removal of the converter is realized, and the environmental protection of a converter flue gas treatment system is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a converter flue gas treatment system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a mixed flow pipe according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the embodiment of the invention provides a converter flue gas treatment system based on dry dedusting, which comprises a converter flue gas hood 2, a vaporization cooling flue 3, a waste heat recovery mechanism 5, a main path 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 with a diffusing chimney 11 and a gas tank 10, and the main path dedusting mechanism comprises a sound wave agglomerator 8 and a ceramic fiber filter 7 which are sequentially arranged along the flue gas circulation direction.
The converter hood 2 is conventional equipment in the art, is covered on a converter and is used for capturing smoke generated in the smelting process of the converter, a smoke outlet of the converter hood 2 is connected with the vaporization cooling flue 3, and the captured smoke can enter the vaporization cooling flue 3. In the vaporization cooling flue 3, the temperature of the flue gas is reduced from about 1600 ℃ to about 900 ℃ by radiation heat exchange energy, so that the waste heat recovery and utilization of the high-temperature section of the converter flue gas are realized.
The sonic agglomerator 8 is used for enabling dust particles with different sizes in the flue gas to generate vibration with different speeds and different frequencies through vibration of sonic waves to collide, and the collided dust can be agglomerated together, so that the quantity of the dust is reduced, the granularity of the dust is increased, and the dust is easier to settle or is removed through a dust remover in the follow-up process; the acoustic wave agglomerator 8 is an existing device, and generally includes an acoustic wave generating device and an acoustic wave amplifying device, and the specific structure is not described here.
The ceramic fiber filter 7 mainly comprises a filter box and a ceramic fiber filter tube arranged in the filter box, wherein the ceramic fiber filter tube is used as core equipment of the ceramic fiber filter tube and is mainly formed by pressing low-density porous ceramic fibers, can resist the temperature of more than 500 ℃, has good filterability, the dust removal efficiency can reach more than 99%, and the smoke concentration can be reduced to 10mg/m after the smoke is filtered by the ceramic fiber filter 7 3 The following is given. In order to achieve better dust removal and ash removal effects, flue gas flows in from the lower part and flows out from the upper part of the ceramic fiber filter 7; ceramic wareAn ash discharging 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 discharging system in order to prevent air in ash discharging from entering a system pipeline. In order to ensure the filtering effect of the ceramic fiber filter 7, the ceramic fiber filter 7 is back-blown by a back-blowing system every interval according to the filtering pressure detection result so as to ensure that dust adhered on the filtering surface falls into an underlying ash discharging system.
The converter flue gas treatment system provided by the embodiment adopts the combination of the acoustic wave agglomerator 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 concentration of the smoke dust of discharged flue gas can be stably controlled at 10mg/m 3 In the method, the ultra-low emission of primary dust removal of the converter is realized, and the environmental protection of a 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 a 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 a flue gas pipeline between the main path dust removal mechanism and the switching station 9; a bypass dust removal mechanism and a first bypass control valve 18 are provided on the dust removal bypass. Optionally, the first bypass control valve 18 is a butterfly valve; the first bypass control valves 18 are preferably provided on both sides of the bypass dust removing mechanism, respectively, and the first bypass control valve 18 on the outlet side can prevent the flue gas flowing in the main dust removing mechanism from being reversely moved into the dust removing bypass. In one embodiment, the bypass dust removal mechanism includes an electrostatic precipitator 6.
Based on the structure, whether the flue gas circulates through the dust removal bypass can be determined according to the actual working condition, for example, when the flue gas quantity is large, the flue gas can work simultaneously with the bypass dust removal mechanism through the main path dust removal mechanism. When the main way dust removing mechanism and the bypass dust removing mechanism work simultaneously, after two ways of purified flue gas are mixed, the purified flue gas at the outlet of the main way dust removing mechanism can dilute the purified flue gas at the outlet of the bypass dust removing mechanism, so that the condition that the concentration of the purified flue gas at the outlet of the bypass dust removing mechanism does not reach the standard is prevented.
Further, as shown in fig. 1, a first main control valve is arranged on the flue gas pipeline between the acoustic wave agglomerator 8 and the bypass junction of the dust removal bypass inlet end. The main way dust removing mechanism and the bypass dust removing mechanism can be switched to work, for example, when the main way dust removing mechanism fails or needs to be overhauled, the bypass dust removing mechanism is put into operation, and the normal operation of the system can be ensured. Similarly, the first main path control valves are respectively arranged at the two sides of the main path dust removing mechanism, and the first main path control valve at the outlet side can prevent the flue gas flowing in the dust removing bypass from reversely moving into the main path dust removing mechanism. The first main control valve may be 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 it is further preferable to use a convection type waste heat boiler 5, 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 waste heat of a 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 this embodiment, the exhaust-heat boiler 5 is adopted, and the temperature of the outlet flue gas of the exhaust-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 the upper opening and exits from the 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, so that cascade utilization of waste heat of converter flue gas can be realized, and the purpose of economically and efficiently recovering waste heat of the medium-temperature section of the flue gas is achieved; an ash discharging system is arranged below an outlet of the waste heat boiler 5 and is used for discharging dust deposited in the waste heat boiler 5, and a valve and an air locking device are arranged on the ash discharging system so as to ensure that the air in ash discharging can not enter the boiler; the ash removing device is arranged in the waste heat boiler 5, so that dust adhered to the heat exchange wall surface can be cleaned regularly; 4-8 explosion-proof valves are arranged in the waste heat boiler 5, and the emergency explosion venting function can be realized when the pressure is too high.
Further optimizing the converter flue gas treatment system, as shown in fig. 1 and 2, the flue gas pipeline between the vaporization cooling flue 3 and the waste heat recovery mechanism 5 comprises a mixed flow pipe body 12, and a cyclone capable of generating cyclone for flue gas 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 cyclone is generated in the passing converter flue gas, the contact collision probability of gas components of the flue gas and oxygen (comprising oxygen in the flue gas and residual oxygen in the pipeline) can be increased (particularly, the residual oxygen in the pipeline can be well induced to be sucked under the action of central negative pressure of the cyclone), and the possibility of explosion caused by mixing of the gas and the oxygen when the temperature of the converter gas is above a self-ignition point (605 ℃) is remarkably reduced because the oxidation reaction can be rapidly generated when the converter gas contacts the oxygen and the explosion is not caused by mixing of the gas and the oxygen; and the cyclone effect of the flue gas is utilized, so that 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 follow-up dust removal mechanism is reduced.
The cyclone is generally formed by annularly arranging a plurality of cyclone blades 121, and the surfaces of the cyclone blades 121 have an inclination angle relative to the smoke flowing direction. 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 to the inner wall of the mixing tube body 12. In another embodiment, the cyclone includes a flow guiding pipe and a first cyclone blade set disposed at an outlet end of the flow guiding pipe, the flow guiding pipe is fixed in the mixed flow pipe body 12 through a mounting bracket, a smoke circulation annular cavity is enclosed between the flow guiding pipe and an inner wall of the mixed flow pipe body 12, and a second cyclone blade set is disposed at an outlet end of the smoke circulation annular cavity; based on the design, two cyclone smoke can be formed in the mixed flow pipe body 12, so that not only can the consumption effect of residual oxygen in a pipeline be improved, but also the mixing effect of converter smoke can be improved, the consumption effect of oxygen in the smoke can be further improved, and the dust removal effect is 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 smoke circulation annular cavity, so that the oxygen consumption effect can be remarkably improved, and particularly, the sprayed carbon powder/coke powder can be fully mixed with smoke based on the cyclone effect of the second cyclone blade group, and the deoxidization effect is better. The powder spraying device can comprise a plurality of spray guns which are annularly arranged along the circumference of the mixed flow pipe body 12.
Correspondingly, an ash discharge hole can be arranged at the bottom of the pipeline at the outlet side of the cyclone so as to timely discharge accumulated ash in the pipeline.
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 with 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 with a flue gas pipeline between the waste heat recovery mechanism 5 and the main dedusting mechanism; an evaporative cooler 4 and a second bypass control valve 14 are provided in the cooling bypass. The three-way pipe 13 can be arranged at the outlet side of the vaporization cooling flue 3 and used for connecting a cooling main path 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 so as to ensure that the three-way pipe can bear the high temperature of about 1000 ℃ smoke for a long time and can bear the high temperature of more than 1200 ℃ smoke for a short time. The three-way pipe 13 is generally in a certain distance with the waste heat recovery mechanism 5 due to the limitation of equipment arrangement, and the two can be connected through a water-cooling pipeline or an adiabatic pipeline; the cooling bypass is also preferably a water-cooled pipe or an insulated pipe. In one embodiment, the water cooling pipe comprises a metal pipe and a water cooling pipe which is wound with a circle outside the metal pipe; the heat-insulating pipeline is made of high-temperature-resistant metal materials, and the inner wall of the pipeline is sprayed with heat-insulating materials.
The second bypass control valve 14 is preferably a high temperature resistant valve capable of being opened and closed automatically, for example, a high temperature resistant butterfly valve; the bypass valve is suitable for long-term bearing of high temperature of about 1000 ℃ and short-term bearing of high temperature of more than 1200 ℃. Similarly, the second bypass control valves 14 are respectively disposed at both sides of the evaporative cooler 4, and the outlet side second bypass control valve 14 can prevent the flue gas flowing in the cooling main path from being reversed into the cooling bypass, and the outlet side second bypass control valve 14 can be 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 junction 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 processed through the cooling bypass, so that the normal operation of the system is ensured, and the problems of production stopping of a 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 early stage of converter blowing, the flue gas temperature is relatively low, the dust content is large, at this time, the flue gas can be controlled to be treated through a cooling bypass, the condition 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 overhaul 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 treated through the waste heat recovery mechanism 5, so that the heat of the converter flue gas is fully recovered.
In one embodiment, the second main control valve includes a high temperature butterfly valve 151 and a high Wen Mangban valve 152, and preferably an automatic control valve capable of being opened and closed automatically is adopted; it is suitable to ensure that the valves can bear the high temperature of the flue gas at about 1000 ℃ for a long time and can bear the high temperature of the flue gas at more than 1200 ℃ for a short time. Similarly, second main path control valves are respectively arranged at two sides of the waste heat recovery mechanism 5, and the outlet side second main path control valve can prevent flue gas flowing in the cooling bypass from being reversely moved into the cooling main path, and can adopt a combination of a common butterfly valve 153 and a common blind plate valve 154.
The system is suitable for modifying the existing converter flue gas treatment system, namely, on the basis of the structure of the existing evaporative cooling flue 3-evaporative cooler 4-electrostatic precipitator 6, a three-way pipe 13 is arranged at the outlet side of the evaporative cooling flue 3, one end of a pipeline where the waste heat recovery mechanism 5 is positioned is connected to the three-way pipe, and the other end is connected to a flue gas pipeline at the outlet side of the evaporative cooler 4; and/or, a three-way pipe is arranged at the outlet side of the evaporative cooler 4, one end of a pipeline where the main way dust removing mechanism is positioned is connected to the three-way pipe, and the other end of the pipeline is connected to a flue gas pipeline at the outlet side of the electrostatic precipitator 6. The transformation mode is convenient to operate and low in transformation cost, so that the transformation mode has 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 normal production of the converter, converter smoke sucked by the converter smoke hood 2 is sequentially processed by the evaporative cooling flue 3, the waste heat recovery mechanism 5, the acoustic wave agglomerator 8 and the ceramic fiber filter 7, then is sent to the switching station 9 through the fan 16, whether the gas recovery condition is met or not is judged according to the smoke components, when the gas recovery condition is met, the smoke enters the gas cabinet 10 through the switching station 9, and when the gas recovery condition is not met, the smoke is discharged through the diffusing chimney 11 through the switching station 9.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. The utility model provides a converter flue gas processing system based on dry dedusting, includes converter petticoat pipe, vaporization cooling flue, waste heat recovery mechanism, main road dust removal mechanism and the switching station that connects gradually through the flue gas pipeline, the flue gas outlet at switching station connects stack and gas holder of diffusing respectively, its characterized in that: the main path dust removing mechanism comprises an acoustic wave agglomerator and a ceramic fiber filter which are sequentially arranged along the smoke flow direction;
the sound wave agglomerator is used for enabling dust particles with different sizes in the flue gas to generate vibration with different speeds and different frequencies through vibration of sound waves so as to collide and cause dust to be agglomerated together;
the ceramic fiber filter comprises a filter box and a ceramic fiber filter tube arranged in the filter box, wherein the ceramic fiber filter tube is formed by pressing low-density porous ceramic fibers;
the flue gas pipeline between the vaporization cooling flue and the waste heat recovery mechanism comprises a mixed flow pipe body, and a cyclone capable of enabling the flue gas to generate cyclone flow is arranged in the mixed flow pipe body so as to increase the contact collision probability of the gas component of the flue gas and oxygen;
the cyclone comprises a flow guide pipe and a first cyclone blade group arranged at the outlet end of the flow guide pipe, the flow guide pipe is fixed in the mixed flow pipe through a mounting bracket, a smoke circulation annular cavity is formed between the flow guide pipe and the inner wall of the mixed flow pipe in a surrounding manner, and a second cyclone blade group is arranged at the outlet end of the smoke circulation annular cavity; and the mixed flow pipe body is provided with a powder spraying device which is used for spraying carbon powder/coke powder into the smoke circulation annular cavity, and the sprayed carbon powder/coke powder is fully mixed with the smoke based on the cyclone action of the second cyclone blade group.
2. The dry dust removal-based converter fume treatment system according to claim 1, wherein: the waste heat recovery device comprises a waste heat recovery mechanism, a main path dust removing mechanism, a dust removing bypass and a switching station, wherein one end of the waste heat recovery mechanism is connected to a flue gas pipeline between the waste heat recovery mechanism and the main path dust removing mechanism; and the dust removing bypass is provided with a bypass dust removing mechanism and a first bypass control valve.
3. The dry dust removal-based converter fume treatment system according to claim 2, wherein: the bypass dust removing mechanism comprises an electrostatic dust collector.
4. The dry dust removal-based converter fume treatment system according to claim 2, wherein: and a first main path control valve is arranged on a flue gas pipeline between the acoustic wave agglomerator and a bypass joint at the inlet end of the dust removal bypass.
5. The dry dust removal-based converter fume treatment system according to claim 1, wherein: the cyclone is a ceramic device.
6. The dry dust removal-based converter fume treatment system according to claim 1, wherein: the device also comprises a cooling bypass, wherein one end of the cooling bypass is connected with 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 with a flue gas pipeline between the waste heat recovery mechanism and the main path dust removal mechanism; an evaporative cooler and a second bypass control valve are arranged on the cooling bypass.
7. The dry dust removal based converter fume treatment system according to claim 6, wherein: and a second main path control valve is arranged on the flue gas pipeline between the waste heat recovery mechanism and the bypass contact point of the inlet end of the cooling bypass.
8. The method of operating a converter fume treatment system according to any one of claims 1 to 7, comprising:
during normal production of the converter, after the converter smoke sucked by the converter smoke hood is sequentially processed by the evaporative cooling flue, the waste heat recovery mechanism, the sonic agglomerator and the ceramic fiber filter, judging whether the smoke is in accordance with the gas recovery condition according to the smoke components, when the smoke is in accordance with the gas recovery condition, enabling the smoke to enter the gas cabinet through the switching station, and when the smoke is not in accordance with the gas recovery condition, enabling the smoke to be discharged through the diffusing chimney through the switching station.
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| CN115491458B (en) * | 2021-06-19 | 2024-02-02 | 上海梅山钢铁股份有限公司 | Method for setting running time of converter acoustic discrete descaling unit |
| 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 |
| CN114606358B (en) * | 2022-03-17 | 2023-02-28 | 浙江伯益环境科技有限公司 | Steelmaking converter flue gas waste heat recovery and dry dedusting system |
| CN116673126B (en) * | 2023-08-03 | 2024-02-02 | 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 |
| CN116907234B (en) * | 2023-09-11 | 2023-12-05 | 北京博鹏中科环保科技有限公司 | Dust removal mode switching system |
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