CN214168032U - Ultra-low emission treatment system for converter flue gas - Google Patents
Ultra-low emission treatment system for converter flue gas Download PDFInfo
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- CN214168032U CN214168032U CN202022845343.1U CN202022845343U CN214168032U CN 214168032 U CN214168032 U CN 214168032U CN 202022845343 U CN202022845343 U CN 202022845343U CN 214168032 U CN214168032 U CN 214168032U
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The utility model relates to a converter flue gas ultra-low emission processing system, include vaporization cooling flue, evaporative cooler and the smart dust remover that connects gradually through flue gas pipeline, the flue gas outlet pipe of smart dust remover is connected with flue gas diffusion branch road and coal gas recovery branch road through tee bend switching station, and ceramic fiber filter has been arranged in proper order and has diffused the chimney on the flue gas diffusion branch road along the flue gas circulation direction. The utility model provides a converter flue gas ultralow emission processing system through arranging ceramic fiber filter on flue gas diffuses the branch road, carries out the secondary fine dust removal to diffusing the flue gas, can make the emission concentration of converter smelting smoke and dust stabilize at 10mg/m3Within, even up to 5mg/m3Within, obviously improve the radiationThe cleanliness of the scattered flue gas realizes the ultralow emission of the flue gas of the converter, and reduces the pollution of smoke dust to the atmosphere; the system is slightly changed on the basis of the original dry dedusting system, cannot cause long-time converter production stop, and can reduce the production stop loss of enterprises caused by ultralow emission modification of the converter.
Description
Technical Field
The utility model belongs to the technical field of the converter flue gas is handled, concretely relates to ultra-low emission processing system of converter flue gas.
Background
Converter steelmaking is the most important steelmaking mode at present, and accounts for more than 85% in the steelmaking field of China. The main process of converter steelmaking is oxygen blowing decarburization, in the process, a large amount of flue gas is generated by the converter, and the main components of the flue gas are CO (accounting for 66 percent) and 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 sometimes referred to as converter gas, which has the characteristics of being flammable and explosive. 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 dust content is about 80-150 g/m3The main components of the dust are FeO, Fe, CaO, MnO and SiO2And C, etc.
At present, the converter flue gas treatment system with the best dust removal effect and the most common converter flue gas treatment system is a dry dust removal system mainly comprising an LT method and a DDS method, wherein the main process comprises the steps of carrying out waste heat recovery on converter flue gas at about 1600 ℃ through a vaporization flue, spraying water mist for cooling when the temperature of the flue gas is reduced to about 900 ℃, then carrying out fine dust removal through an electrostatic dust remover, recovering high-quality coal gas, igniting low-quality coal gas and emptying. Compared with the prior wet dust removal, the dry dust removal has better dust removal effect, less water spray and no need of sewage and sludge treatment, so the dry dust removal system becomes the most widely applied converter flue gas treatment system at present.
However, the existing converter dry dedusting system can not meet the requirement of ultralow emission of steel (the emission limit value of converter primary dedusting is required to be 10 mg/m)3) The requirement of the system is that because the fine dust removal of the dry dust removal system adopts electrostatic dust removal instead of filtration dust removal, the smoke dust discharge amount of the dry dust removal system with the best effect at present can be controlled to be only 15mg/m3In addition, most of the dust discharge amount of the dry dust removal system can be stabilized at 20mg/m3Within the range, the requirement of ultralow emission in the steel industry cannot be met, and great trouble is caused to the environmental protection standard of enterprises.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a converter flue gas ultra-low emission treatment system, which can at least solve part of the defects of the prior art.
The utility model relates to a converter flue gas ultra-low emission processing system, include vaporization cooling flue, evaporative cooler and the smart dust remover that connects gradually through flue gas pipeline, the flue gas outlet pipe of smart dust remover is connected with flue gas diffusion branch road and coal gas recovery branch road through tee bend switching station, ceramic fiber filter has been arranged in proper order and has diffused the chimney along the flue gas circulation direction on the flue gas diffusion branch road.
In one embodiment, the fine dust collector is an electrostatic dust collector.
As an embodiment, the evaporative cooler is configured with a coarse ash bin for collecting settled coarse ash.
As one embodiment, a heat exchange pipe is arranged on the inner wall of the coarse ash bin.
As an embodiment, the heat exchange tubes are arranged in a spiral manner in the coarse ash bin.
In one embodiment, the inlet end of the heat exchange tube is connected to a blower, the outlet end of the heat exchange tube is bypassed to the flue gas emission branch and the bypass point is located on the inlet side of the ceramic fiber filter.
In one embodiment, the ceramic fiber filter is provided with a blowback line.
In one embodiment, a heater is disposed on the blowback pipeline, and a flue gas temperature detection device is disposed inside or on an inlet side of the ceramic fiber filter, and the flue gas temperature detection device is interlocked with the heater.
In one embodiment, the filter box and the flue gas channel of the ceramic fiber filter are covered with insulating layers.
The utility model discloses following beneficial effect has at least:
the utility model provides a converter flue gas ultralow emission processing system through arranging ceramic fiber filter on flue gas diffuses the branch road, carries out the secondary fine dust removal to diffusing the flue gas, can make the emission concentration of converter smelting smoke and dust stabilize at 10mg/m3Within, or even up to5mg/m3The cleanliness of the diffused flue gas is obviously improved, the ultralow emission of the flue gas of the converter is realized, and the pollution of smoke dust to the atmosphere is reduced. The system is slightly changed on the basis of the original dry dedusting system, cannot cause long-time converter production stop, and can reduce the production stop loss of enterprises caused by ultralow emission modification of the converter.
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 ultra-low emission treatment system provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are described below clearly and completely, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As figure 1, the embodiment of the utility model provides a converter flue gas minimum discharge processing system, include vaporization cooling flue 2, evaporative cooler 3 and the smart dust remover 5 that connect gradually through the flue gas pipeline, the flue gas outlet pipe of smart dust remover 5 is connected with flue gas diffusion branch road and coal gas recovery branch road through tee bend switching station 8, ceramic fiber filter 11 and diffusion chimney 13 have been arranged in proper order along the flue gas circulation direction on the flue gas diffusion branch road.
The vaporization cooling flue 2 and the evaporation cooler 3 are conventional equipment in the field, and the temperature of high-temperature flue gas is reduced from about 1600 ℃ to about 900 ℃ after radiation heat exchange in the vaporization cooling flue 2; the double-medium spray gun is arranged in the evaporative cooler 3, gas and water can be sprayed simultaneously to obtain fine-particle water mist, the purposes of dust removal, temperature reduction and flue gas conditioning can be achieved by spraying water mist in the evaporative cooler 3, and the flue gas can be generally cooled to about 250 ℃.
The low-temperature flue gas treated by the evaporative cooler 3 enters a fine dust collector 5 for fine dust collection; the fine dust collector 5 is generally an electrostatic dust collector 5. Referring to fig. 1, the electrostatic precipitator 5 is provided with a fine ash bin 6, and fine ash generated during the operation of the electrostatic precipitator 5 enters the fine ash bin 6.
The three-way switching station 8 is of a conventional structure in the field, can control the flow direction of flue gas according to a flue gas component detection structure, controls the flue gas component to enter a gas recovery branch for gas recovery when the flue gas component meets the recovery condition, and controls the flue gas component to enter a flue gas diffusion branch for gas diffusion when the flue gas component does not meet the recovery condition. In one embodiment, the recovery condition is satisfied when the volume content of CO in the flue gas is more than 20% and the volume content of oxygen in the flue gas is less than 2%. The induced draft fans 7 required by the system can be arranged on the inlet side of the three-way switching station 8.
In one embodiment, as shown in fig. 1, a gas cooler 9 and a gas holder 10 are arranged on the gas recovery branch, and the gas cooler 9 is used for cooling the gas to be recovered.
The ceramic fiber filter 11 is the existing equipment, mainly includes the filter box and the ceramic fiber filter tube, the core is the ceramic fiber filter tube, mainly by the low density porous ceramic fiber pressing composition, can be able to bear the temperature above 500 ℃, and has good filterability, the dust collection efficiency can reach more than 99%, after the flue gas is filtered by the ceramic fiber filter 11, the smoke concentration can be reduced to 10mg/m3Below, even up to 5mg/m3The following. Compared with the conventional cloth bag dust removal, the ceramic fiber filter 11 not only can resist high temperature, but also is more difficult to block, is not easy to generate the problem of bag burning or bag pasting, and is more favorable for stable and smooth production.
In order to achieve a good dust removal and ash removal effect, it is preferable that the flue gas flows in from below and flows out from above the ceramic fiber filter 11.
Further preferably, the ceramic fiber filter 11 is provided with a back-flushing pipeline, so that the ceramic fiber filter 11 can be back-flushed, and dust adhered to the filtering surface falls into the fine dust bin 12 below the filtering surface, thereby effectively improving the filtering effect of the ceramic fiber filter 11 and avoiding excessive filtering resistance loss; wherein, the ceramic fiber filter 11 can be back-blown by the back-blowing pipeline at intervals according to the detection result of the filtering pressure. The back flushing pipeline can adopt inert gases such as nitrogen and the like.
According to the ultra-low emission treatment system for the converter flue gas, the ceramic fiber filter 11 is arranged on the flue gas emission branch to perform secondary fine dust removal on the emitted flue gas, so that the emission concentration of converter smelting smoke dust is stabilized at 10mg/m3Within, even up to 5mg/m3The cleanliness of the diffused flue gas is obviously improved, the ultralow emission of the flue gas of the converter is realized, and the pollution of smoke dust to the atmosphere is reduced. The system is slightly changed on the basis of the original dry dedusting system, cannot cause long-time converter production stop, and can reduce the production stop loss of enterprises caused by ultralow emission modification of the converter.
Further optionally, the filter box and the flue gas channel of the ceramic fiber filter 11 are covered with an insulating layer, and the insulating layer can alleviate the problem of dewing of the ceramic fiber filter 11 caused by over-cooling of the flue gas. The heat-insulating layer can be made of conventional heat-insulating materials such as heat-insulating cotton and the like.
Further optionally, for the above solution with a back-flushing pipeline, a heater is disposed on the back-flushing pipeline, and a flue gas temperature detection device is disposed inside or on the inlet side of the ceramic fiber filter 11, and the flue gas temperature detection device is interlocked with the heater. Through the flue gas temperature of above-mentioned flue gas temperature detection device real-time detection through ceramic fiber filter 11, when the flue gas temperature was lower, steerable above-mentioned heating device heated the blowback medium, blowback medium with this part heating blows in ceramic fiber filter 11 in, can avoid the low temperature flue gas at ceramic fiber filter tube surface dewfall, guarantees ceramic fiber filter 11's normal reliable operation.
As shown in fig. 1, the evaporative cooler 3 is provided with a coarse ash bin 4 for collecting settled coarse ash, the temperature of the coarse ash collected in the coarse ash bin 4 is high (generally about 150 ℃), and the residual heat of the coarse ash is not generally utilized, but the coarse ash is unloaded and transported out. As a preferable scheme, in this embodiment, the residual heat of the coarse ash in the coarse ash bin 4 is utilized; in one embodiment, the inner wall of the coarse ash bin 4 is provided with a heat exchange tube, and the heat exchange tube is preferably arranged in the coarse ash bin 4 in a spiral manner, so that the waste heat utilization effect can be improved; the heat exchange medium adopted in the heat exchange tube can be water, air and other media.
Further, the heat exchange medium adopted by the heat exchange tube is air, specifically, the inlet end of the heat exchange tube is connected with an air blower, the outlet end of the heat exchange tube is connected to the flue gas emission branch, and the bypass point is positioned at the inlet side of the ceramic fiber filter 11. Through letting in the hot-air after the heat transfer to the flue gas branch road of diffusing, can improve the temperature of diffusing the flue gas on the one hand, can avoid the low temperature flue gas to condense on ceramic fiber filter tube surface, guarantee ceramic fiber filter 11's normal reliable operation, on the other hand, the air of sneaking into can dilute the CO concentration in the diffusing flue gas. A control valve can be arranged on the bypass pipe and opened and closed according to the detection structure of the smoke temperature detection device; other heat exchange air can be used for other purposes, for example, in some cold regions, the hot air can be used for heat preservation of the fine ash bin 6 to ensure normal ash conveying and unloading of fine ash.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a converter flue gas minimum emission processing system, includes vaporization cooling flue, evaporative cooler and the smart dust remover that connects gradually through flue gas pipeline, the flue gas outlet pipe of smart dust remover is connected with flue gas through tee bend switching station and diffuses branch road and coal gas recovery branch road, its characterized in that: and the smoke diffusing branch is sequentially provided with a ceramic fiber filter and a diffusing chimney along the smoke flowing direction.
2. The ultra-low emission treatment system for converter flue gas of claim 1, wherein: the fine dust collector is an electrostatic dust collector.
3. The ultra-low emission treatment system for converter flue gas of claim 1, wherein: the evaporative cooler is provided with a coarse ash bin for collecting settled coarse ash.
4. The ultra-low emission treatment system for converter flue gas of claim 3, wherein: and the inner wall of the coarse ash bin is provided with a heat exchange pipe.
5. The ultra-low emission treatment system for converter flue gas of claim 4, wherein: the heat exchange tubes are spirally arranged in the coarse ash bin.
6. The ultra-low emission treatment system for converter flue gas of claim 4, wherein: the inlet end of the heat exchange tube is connected with an air blower, the outlet end of the heat exchange tube is connected to the flue gas emission branch in a bypassing mode, and the bypassing point is located on the inlet side of the ceramic fiber filter.
7. The ultra-low emission treatment system for converter flue gas of claim 1, wherein: the ceramic fiber filter is provided with a back flushing pipeline.
8. The ultra-low emission treatment system for converter flue gas of claim 7, wherein: the ceramic fiber filter is characterized in that a heater is arranged on the back flushing pipeline, a smoke temperature detection device is arranged inside the ceramic fiber filter or on the inlet side of the ceramic fiber filter, and the smoke temperature detection device is interlocked with the heater.
9. The ultra-low emission treatment system for converter flue gas of claim 1, wherein: and the filter box and the flue gas channel of the ceramic fiber filter are both covered with heat-insulating layers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022845343.1U CN214168032U (en) | 2020-12-01 | 2020-12-01 | Ultra-low emission treatment system for converter flue gas |
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| CN202022845343.1U CN214168032U (en) | 2020-12-01 | 2020-12-01 | Ultra-low emission treatment system for converter flue gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116463148A (en) * | 2023-04-20 | 2023-07-21 | 北京科技大学 | Method and device for producing hydrogen by blowing steam-coke powder into converter flue |
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2020
- 2020-12-01 CN CN202022845343.1U patent/CN214168032U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116463148A (en) * | 2023-04-20 | 2023-07-21 | 北京科技大学 | Method and device for producing hydrogen by blowing steam-coke powder into converter flue |
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