CN108827013B - System and method for purifying flue gas in continuous charging electric arc furnace - Google Patents
System and method for purifying flue gas in continuous charging electric arc furnace Download PDFInfo
- Publication number
- CN108827013B CN108827013B CN201810935072.3A CN201810935072A CN108827013B CN 108827013 B CN108827013 B CN 108827013B CN 201810935072 A CN201810935072 A CN 201810935072A CN 108827013 B CN108827013 B CN 108827013B
- Authority
- CN
- China
- Prior art keywords
- flue gas
- flue
- cooling tower
- temperature
- evaporative cooling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 141
- 239000003546 flue gas Substances 0.000 title claims abstract description 141
- 238000010891 electric arc Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 76
- 239000000428 dust Substances 0.000 claims abstract description 69
- 239000000779 smoke Substances 0.000 claims abstract description 45
- 238000004321 preservation Methods 0.000 claims abstract description 32
- 238000004062 sedimentation Methods 0.000 claims abstract description 26
- 238000000746 purification Methods 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 6
- 239000011819 refractory material Substances 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims 1
- 230000008020 evaporation Effects 0.000 claims 1
- 239000003517 fume Substances 0.000 claims 1
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 abstract description 29
- 239000000126 substance Substances 0.000 abstract description 27
- 230000000711 cancerogenic effect Effects 0.000 abstract description 26
- 231100000315 carcinogenic Toxicity 0.000 abstract description 25
- 239000000498 cooling water Substances 0.000 abstract description 4
- 231100000614 poison Toxicity 0.000 abstract 1
- 230000007096 poisonous effect Effects 0.000 abstract 1
- 231100000331 toxic Toxicity 0.000 description 25
- 230000002588 toxic effect Effects 0.000 description 25
- 230000035484 reaction time Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to a flue gas purification system and a flue gas purification method in a continuous charging electric arc furnace. This flue gas purification system includes: one end of the water-cooling elbow is communicated with a smoke outlet of a scrap steel preheating section of the electric arc furnace in a sealing way; the other end of the water-cooling elbow is hermetically led into the sedimentation chamber; a thermal stack arranged to have a lower end and an upper end, wherein the lower end of the thermal stack is in sealed communication with the upper portion of the settling chamber; an evaporative cooling tower with a flue gas inlet and a flue gas outlet, wherein the higher end of the heat preservation flue is communicated with the flue gas inlet of the evaporative cooling tower in a sealing way; the bag type dust collector is provided with a flue gas inlet and a flue gas outlet, wherein the flue gas inlet of the dust collector is communicated with the flue gas outlet of the evaporative cooling tower through a pipeline provided with a mixing air valve; and the discharge device is communicated with the flue gas outlet of the dust remover. The content of dioxin poisonous cancerogenic substances in the purified flue gas is greatly reduced; the cooling water requirement is also significantly reduced.
Description
Technical Field
The invention relates to the technical field of flue gas purification, in particular to a flue gas purification system and method in a continuous charging electric arc furnace.
Background
The electric arc furnace can generate a great amount of high-temperature flue gas in the smelting process, and the flue gas contains harmful substances such as dust and the like. In particular to a continuous charging electric arc furnace, such as an Conscoy electric furnace, scrap steel is preheated by high-temperature flue gas in a continuous charging system, and a great amount of energy sources are saved, but the novel environment problem is also brought, and harmful impurities in the scrap steel are contacted with the high-temperature flue gas, so that a great amount of harmful gases such as dioxin and the like are generated. How to purify the flue gas in the electric arc furnace to ensure that the emission of particulate matters in the flue dust reaches the standard and eliminate harmful substances such as dioxin and the like generated in the process of preheating scrap steel, especially the current serious environment-friendly situation, is always a difficult problem for electric arc furnace smelting enterprises.
Disclosure of Invention
In order to solve all or part of the problems, the invention provides a method for greatly reducing the content of dioxin toxic cancerogenic substances in the purified flue gas; and the flue gas purification technology for obviously reducing the cooling water requirement.
According to a first aspect of the present invention there is provided a flue gas cleaning system in a continuous feed electric arc furnace comprising: one end of the water-cooling elbow is communicated with the smoke outlet of the scrap steel preheating section of the electric arc furnace in a sealing way, so that the smoke temperature is reduced, and the transportation pipeline is prevented from being burnt due to too high smoke temperature; the sedimentation chamber is sealed at the other end of the water-cooling elbow, and the sedimentation chamber is filled with the water-cooling elbow, so that large-particle smoke dust in the smoke is sunk, and deposition in the bag type dust collector is reduced; the lower end of the heat preservation flue is communicated with the upper part of the settling chamber in a sealing way, so that the high-temperature time of the flue gas is prolonged, and the decomposition rate of dioxin toxic cancerogenic substances in the flue gas is improved; an evaporative cooling tower having a flue gas inlet and a flue gas outlet, wherein the upper end of the insulating flue is in sealed communication with the flue gas inlet of the evaporative cooling tower; the bag type dust collector is provided with a smoke inlet and a smoke outlet, wherein the smoke inlet of the bag type dust collector is communicated with the smoke outlet of the evaporative cooling tower in a sealing way; and the discharge device is communicated with the flue gas outlet of the bag type dust collector.
In a further technical scheme, the upper part of the bag type dust collector can be provided with a plurality of compressed air inlets, and the lower part of the bag type dust collector is correspondingly provided with a plurality of dust collecting funnels. That is, the compressed air introduction ports are provided in one-to-one correspondence with the dust collection funnels.
In a further technical scheme, the flue gas purification system can further comprise a conveyor and an ash storage bin, wherein the conveyor is arranged below the dust collection hoppers and is used for conveying dust collected on the dust collection hoppers to the ash storage bin. In this case, a bucket elevator may be further included to carry dust from the conveyor into the ash bin.
In a further technical scheme, the exhaust device comprises a smoke exhaust fan and a chimney, and a smoke outlet of the evaporative cooling tower is sequentially communicated with the smoke exhaust fan and the chimney in a sealing mode.
In a further technical scheme, a pipeline provided with a mixing air valve is communicated between the flue gas inlet of the bag type dust collector and the flue gas outlet of the evaporative cooling tower in a sealing way.
In a further technical scheme, the heat preservation flue is a flue with refractory materials inside.
According to a second aspect of the present invention, there is provided a method of cleaning flue gas in a continuous feed electric arc furnace, comprising: flue gas from a smoke outlet of a scrap steel preheating section of the electric arc furnace enters a settling chamber after passing through a water-cooling elbow; the flue gas after sedimentation and pre-dust removal in the sedimentation chamber enters an evaporative cooling tower through a heat preservation flue; introducing flue gas exiting the evaporative cooling tower into a bag house; and then sending the flue gas from the bag filter to a discharge device.
In a further technical scheme, the flue gas temperature near the flue gas outlet of the scrap steel preheating section of the electric arc furnace is 700-1000 ℃; and the flue gas is cooled to 200-250 ℃ in the evaporative cooling tower at 200-400 ℃/s.
In a further technical scheme, when the temperature of the flue gas entering the bag type dust collector exceeds a first set temperature, the air mixing valve is automatically opened; and when the temperature of the flue gas entering the bag type dust collector is reduced to a second set temperature, the air mixing valve is automatically closed. The first set temperature is preferably 230℃and the second set temperature is preferably 200 ℃.
In a further technical scheme, the bag type dust collector adopts a high-temperature resistant filter material, and the filtering area reaches 11000 square meters.
The flue gas purification system in the continuous feeding electric arc furnace of the first aspect of the invention and the flue gas purification method in the continuous feeding electric arc furnace of the second aspect of the invention can reduce dioxin toxic cancerogenic substances in the flue gas by arranging a heat preservation flue and an evaporative cooling tower to enable the flue gas to be subjected to heat preservation and quenching treatment. A large amount of high-temperature flue gas generated in the smelting process of the electric arc furnace sequentially passes through a water-cooling elbow, a settling chamber, a heat preservation flue, an evaporative cooling tower, a bag type dust collector and a discharge device. The flue gas enters a settling chamber through a water-cooling elbow, and particles in the flue gas are settled and pre-dedusted in the settling chamber; the flue gas enters an evaporative cooling tower through a heat preservation flue, and dioxin toxic cancerogenic substances in the flue gas are basically decomposed and destroyed in the heat preservation flue, so that the evaporative cooling tower rapidly cools (quenches) the flue gas, the synthetic reaction time of the dioxin toxic cancerogenic substances in the flue gas is shortened, namely the production of the dioxin toxic cancerogenic substances is reduced, and the environment is protected; and finally, the flue gas enters a bag type dust collector to carry out fine dust removal, and then is discharged at high altitude through a discharge device. The flue gas purification system in the continuous charging electric arc furnace adopts the heat preservation flue and the evaporative cooling tower, so that the cooling water requirement is greatly reduced, and the construction cost of water treatment facilities and the water treatment operation cost are also reduced.
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. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
Fig. 1 shows a schematic view of a flue gas cleaning system according to an embodiment of the invention.
Detailed Description
Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.
Fig. 1 shows a flue gas cleaning system 100 in a continuous feed electric arc furnace in accordance with an embodiment of the present invention. As shown in fig. 1, the flue gas cleaning system 100 according to the embodiment of the present invention mainly includes: the device comprises a water-cooling elbow 2, a settling chamber 3, a heat preservation flue 4, an evaporative cooling tower 5, a bag type dust collector 6 and a discharge device. One end of the water-cooling elbow 2 is communicated with the smoke outlet 1 of the scrap steel preheating section of the electric arc furnace in a sealing way, and the other end of the water-cooling elbow is communicated with the sedimentation chamber 3 in a sealing way. The insulating flue 4 is arranged to have a lower end and an upper end, the lower end of the insulating flue 4 being in sealed communication with the upper part of the settling chamber 3, the upper end of the insulating flue 4 being in sealed communication with the flue gas inlet of the evaporative cooling tower 5. The bag filter 6 has a flue gas inlet and a flue gas outlet, wherein the flue gas inlet is in sealed communication with the flue gas outlet of the evaporative cooling tower 5, and the flue gas outlet is in communication with the discharge device.
The flue gas purification system 100 in the continuous charging electric arc furnace of the first aspect of the invention and the flue gas purification method in the continuous charging electric arc furnace of the second aspect of the invention can reduce dioxin toxic cancerogenic substances in the flue gas by arranging the heat preservation flue 4 and the evaporative cooling tower 5 to enable the flue gas to be subjected to heat preservation and quenching treatment. A large amount of high-temperature flue gas generated in the smelting process of the electric arc furnace sequentially passes through the water-cooling elbow 2, the sedimentation chamber 3, the heat preservation flue 4, the evaporative cooling tower 5, the bag type dust collector 6 and the discharge device. The flue gas enters a settling chamber 3 through a water-cooling elbow 2, and particles in the flue gas are settled and pre-dedusted in the settling chamber 3, wherein a warmer can be further arranged in the settling chamber 3, when the temperature of the flue gas is less than 700 ℃, the warmer is automatically opened, and when the temperature of the flue gas is more than 750 ℃, the warmer is automatically closed, so that the temperature of the flue gas before entering a heat preservation flue is ensured to be more than 700 ℃; the flue gas enters the evaporative cooling tower 5 through the heat preservation flue 4, and the heat preservation flue 4 is a flue with refractory materials inside, so that the flue gas is prevented from burning and is heat-preserved. The toxic and cancerogenic substances of the dioxin in the flue gas are basically decomposed and destroyed in the heat preservation flue 4, the evaporative cooling tower 5 rapidly cools (quenches) the flue gas, the synthetic reaction time of the toxic and cancerogenic substances of the dioxin in the flue gas is shortened, namely the toxic and cancerogenic substances of the dioxin are reduced, and the environment is protected; and finally, the flue gas enters a bag type dust collector 6 for fine dust removal, and then is discharged at high altitude through a discharge device. The flue gas purification system in the continuous charging electric arc furnace adopts the heat preservation flue 4 and the evaporative cooling tower 5, so that the cooling water requirement is greatly reduced, and the construction cost of water treatment facilities and the water treatment operation cost are also reduced.
The deviation of the using temperature and the design temperature of the bag filter 6 can cause serious consequences, and the high-temperature gas must be cooled to below the temperature which can be born by the filter material; in order to prevent condensation, the gas temperature must be kept above the dew point (the temperature at which the air is cooled to saturation is called dew point temperature, abbreviated as dew point, in the case where the water vapor content in the air is constant and the air pressure is kept constant). In the embodiment, a pipeline provided with a mixing air valve 7 is in sealing communication between the flue gas inlet of the bag type dust collector 6 and the flue gas outlet of the evaporative cooling tower 5. When the temperature of the flue gas entering the bag type dust collector 6 exceeds a first set temperature, the air mixing valve 7 is automatically opened, so that wild air enters, the temperature of the flue gas is reduced to a second set temperature, and the air mixing valve 7 is automatically closed. The temperature of the flue gas entering the bag filter 6 is ensured to be lower than the bearable temperature of the filter material and higher than the dew point. In general, the bag house 6 for the treatment of high temperature gases is expensive and requires a high cost for air cooling facilities such as the evaporative cooling tower 5. The present invention determines the cooling method according to the temperature and air quantity formed by the production process, and takes the size and the dimension of the bag filter 6 into consideration to prepare the most economical treatment temperature. The first set temperature is preferably set to 230 ℃, and the second set temperature is preferably set to 200 ℃. The air mixing valve 7 is arranged to control the temperature of the flue gas entering the bag filter 6 to be 200-230 ℃ and increase the working stability of the bag filter 6.
The bag collector 6 is provided with a plurality of compressed air inlets at its upper part and a plurality of dust collecting funnels at its lower part. The compressed air inlet and the dust collecting hopper are arranged in one-to-one correspondence, so that the working efficiency of the bag type dust collector 6 is improved. The baghouse 6 may preferably be a low pressure pulse baghouse. A conveyor 10 can be arranged below a row of dust collecting funnels of the bag type dust collector 6, and dust leaked by the dust collecting funnels is sent to a bucket elevator 11 through the conveyor 10 and is sent to an ash storage bin 12 again, so that the automation level of the flue gas purification system 100 is improved. The bag type dust collector 6 can adopt high temperature resistant filter materials, and the filtering area can reach 11000m 2 The filtering effect on the smoke is improved.
The exhaust device comprises a smoke exhaust fan 8 and a chimney 9, wherein the smoke exhaust fan 8 discharges the smoke from the bag filter 6 into the chimney 9 for discharging. The smoke exhaust fan 8 can adopt a frequency converter to regulate speed and save energy so as to meet the requirement of air quantity change under different working conditions of the discharge device and achieve the purposes of energy saving and consumption reduction.
The purification steps of the flue gas purification system of the present invention are briefly described below. Taking 220 ton continuous charging Consdi electric arc furnace as an example, the flue gas amount in the furnace is 200000-300000Nm according to the material type 3 And/h, the temperature of the flue gas is 1000-1200 ℃, and the dust concentration of the flue gas is aboutAt 8g/Nm 3 。
When the high-temperature flue gas is continuously fed through Consedi, the scrap steel is preheated, and the temperature at the smoke outlet 1 of the scrap steel preheating section is 700-1000 ℃. The high-temperature flue gas enters a sedimentation chamber 3 with the flow of 20m multiplied by 7m multiplied by 10m through a water cooling elbow 2 for sedimentation, the flue gas after sedimentation and pre-dust removal in the sedimentation chamber 3 is sent into an evaporative cooling tower 5 through a heat preservation flue 4, and the temperature of the flue gas in the evaporative cooling tower 5 is quenched to 200-250 ℃ at the speed of 200-400 ℃/s. The flue gas after rapid cooling enters a bag type dust collector 6 for fine dust removal. The low temperature smoke volume after cooling and dedusting reaches the standard is 70-75 multiplied by 10 4 m 3 And/h, driving the smoke exhaust fan 8 to discharge high altitude through a chimney 9 with the height of 28-30m by a 1750kW variable frequency motor. When the temperature of the flue gas is abnormal and exceeds 230 ℃ which is the highest set temperature of the bag-type dust collector 6, the air mixing valve 7 at the upstream of the bag-type dust collector 6 is automatically opened to mix wild air; when the temperature of the flue gas is reduced to 200 ℃, the air mixing valve 7 is automatically closed.
Example 1
The temperature at the smoke outlet 1 of the scrap steel preheating section is 700 ℃, high-temperature smoke enters the sedimentation chamber 3 through the water-cooling elbow 2 to carry out sedimentation pre-dust removal, then enters the evaporative cooling tower 5 through the heat preservation flue 4, the toxic and cancerogenic substances of dioxin in the smoke are basically decomposed and destroyed by the heat preservation flue 4, the evaporative cooling tower 5 is quenched to 200 ℃ at the speed of 200 ℃/s, the synthetic reaction time of the toxic and cancerogenic substances of the dioxin in the smoke is shortened, and the toxic and cancerogenic substances of the dioxin are reduced. The flue gas after rapid cooling enters a bag type dust collector 6 for fine dust removal, and finally the temperature of the flue gas is 76 ℃ and the dust concentration is 8.2mg/Nm 3 Containing 0.38mg/Nm of dioxin 3 Reaching the emission standard.
Example two
The temperature at the smoke outlet 1 of the scrap steel preheating section is 900 ℃, high-temperature smoke enters the sedimentation chamber 3 through the water-cooling elbow 2 to carry out sedimentation pre-dust removal, then enters the evaporative cooling tower 5 through the heat preservation flue 4, the heat preservation flue 4 enables dioxin toxic cancerogenic substances in the smoke to be basically decomposed and destroyed, the evaporative cooling tower 5 is quenched to 210 ℃ at the speed of 300 ℃/s, and the dioxin toxic cancerogenic substances in the smoke are shortenedThe synthesis reaction time is reduced, namely, the production of dioxin toxic cancerogenic substances is reduced. The flue gas after rapid cooling enters a bag type dust collector 6 for fine dust removal, and finally the temperature of the flue gas is 79 ℃, and the dust concentration is 8.9mg/Nm 3 0.42mg/Nm of toxic cancerogenic substance containing dioxin 3 Reaching the emission standard.
Example III
The temperature at the smoke outlet 1 of the scrap steel preheating section is 1000 ℃, high-temperature smoke enters the sedimentation chamber 3 through the water-cooling elbow 2 to carry out sedimentation pre-dust removal, then enters the evaporative cooling tower 5 through the heat preservation flue 4, the toxic and cancerogenic substances of dioxin in the smoke are basically decomposed and destroyed by the heat preservation flue 4, the evaporative cooling tower 5 is quenched to 228 ℃ at the speed of 400 ℃/s, the synthetic reaction time of the toxic and cancerogenic substances of the dioxin in the smoke is shortened, and the toxic and cancerogenic substances of the dioxin are reduced. The flue gas after rapid cooling enters a bag type dust collector 6 for fine dust removal, and finally the temperature of the flue gas is 83 ℃ and the dust concentration is 8.6mg/Nm 3 0.41mg/Nm of toxic carcinogen containing dioxin 3 Reaching the emission standard.
Example IV
The temperature at the smoke outlet 1 of the scrap steel preheating section is 1022 ℃, high-temperature smoke enters the sedimentation chamber 3 through the water-cooling elbow 2 for sedimentation pre-dedusting, then enters the evaporative cooling tower 5 through the heat preservation flue 4, the toxic and cancerogenic substances of dioxin in the smoke are basically decomposed and destroyed by the heat preservation flue 4, the evaporative cooling tower 5 is quenched to 260 ℃ at the speed of 400 ℃/s, and the synthetic reaction time of the toxic and cancerogenic substances of dioxin in the smoke is shortened, namely the toxic and cancerogenic substances of dioxin are reduced. Because 260 ℃ is higher than 230 ℃, the air mixing valve 7 at the upstream of the bag-type dust collector 6 is automatically opened to mix wild air, when the temperature of the flue gas is reduced to 200 ℃, the air mixing valve 7 is automatically closed, the flue gas after rapid cooling enters the bag-type dust collector 6 to carry out fine dust removal, and finally the temperature of the flue gas is 85 ℃, and the dust concentration is 7.9mg/Nm 3 0.47 mg/Nm of toxic cancerogenic substance containing dioxin 3 Reaching the emission standard.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. In the description of the present invention, the meaning of "plurality" is two or more unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "connected," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally formed, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (10)
1. A method for purifying flue gas in a continuous feed electric arc furnace, comprising:
flue gas from a smoke outlet of a scrap steel preheating section of the electric arc furnace enters a settling chamber after passing through a water-cooling elbow;
the flue gas after sedimentation pre-dedusting in the sedimentation chamber enters an evaporative cooling tower through a heat preservation flue, wherein the heat preservation flue is arranged to have a lower end and a higher end, the lower end is communicated with the upper part of the sedimentation chamber in a sealing way, and the higher end is communicated with a flue gas inlet of the evaporative cooling tower in a sealing way;
introducing flue gas exiting the evaporative cooling tower into a bag house; and
then sending the flue gas from the bag type dust collector into a discharge device;
wherein, a heater is arranged in the sedimentation chamber, when the temperature of the flue gas is less than 700 ℃, the heater is automatically opened to ensure that the temperature of the flue gas before entering the heat preservation flue is more than 700 ℃, and the flue gas is cooled to 200-250 ℃ in the evaporation cooling tower at 200-400 ℃/s.
2. The flue gas cleaning method according to claim 1, wherein the flue gas temperature in the vicinity of the exhaust port of the scrap preheating section of the electric arc furnace is 700 to 1000 ℃.
3. The flue gas cleaning method according to claim 2, wherein the air mixing valve is automatically opened when the temperature of the flue gas entering the bag house exceeds a first set temperature; and when the temperature of the flue gas entering the bag type dust collector is reduced to a second set temperature, the air mixing valve is automatically closed.
4. The method for purifying flue gas according to claim 1, wherein the bag filter uses a high temperature resistant filter material.
5. A fume purification system in a continuous feed electric arc furnace comprising:
one end of the water-cooling elbow is communicated with a smoke outlet of a scrap steel preheating section of the electric arc furnace in a sealing way;
a sedimentation chamber, wherein the other end of the water-cooling elbow is sealed and introduced into the sedimentation chamber;
a thermal stack having a lower end and an upper end, wherein the lower end of the thermal stack is in sealed communication with the upper portion of the settling chamber;
an evaporative cooling tower having a flue gas inlet and a flue gas outlet for cooling the flue gas within the evaporative cooling tower to 200-250 ℃ at 200-400 ℃/s, wherein the upper end of the insulated flue is in sealed communication with the flue gas inlet of the evaporative cooling tower;
the bag type dust collector is provided with a smoke inlet and a smoke outlet, wherein the smoke inlet of the bag type dust collector is communicated with the smoke outlet of the evaporative cooling tower in a sealing way; and
the discharge device is communicated with a flue gas outlet of the bag type dust collector,
the sedimentation chamber is internally provided with a warmer, and the warmer is used for being automatically opened when the temperature of the flue gas is less than 700 ℃ so as to ensure that the temperature of the flue gas before entering the heat preservation flue is more than 700 ℃.
6. The flue gas cleaning system according to claim 5, wherein a plurality of compressed air introduction ports are provided at an upper portion of the bag house, and a plurality of dust collection funnels are provided at a lower portion thereof.
7. The flue gas cleaning system according to claim 6, further comprising a conveyor and an ash bin, wherein the conveyor is disposed below a plurality of the dust collection hoppers for delivering dust collected thereon to the ash bin.
8. The flue gas cleaning system according to claim 5, wherein the exhaust device comprises a flue gas blower and a chimney, and the flue gas outlet of the evaporative cooling tower is in sealing communication with the flue gas blower and the chimney in sequence.
9. The flue gas cleaning system according to claim 5, wherein a duct provided with a mixing valve is in sealed communication between the flue gas inlet of the baghouse and the flue gas outlet of the evaporative cooling tower.
10. The flue gas cleaning system according to claim 5, wherein the insulating flue is a flue having a refractory material disposed therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810935072.3A CN108827013B (en) | 2018-08-16 | 2018-08-16 | System and method for purifying flue gas in continuous charging electric arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810935072.3A CN108827013B (en) | 2018-08-16 | 2018-08-16 | System and method for purifying flue gas in continuous charging electric arc furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108827013A CN108827013A (en) | 2018-11-16 |
| CN108827013B true CN108827013B (en) | 2024-03-15 |
Family
ID=64151028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810935072.3A Active CN108827013B (en) | 2018-08-16 | 2018-08-16 | System and method for purifying flue gas in continuous charging electric arc furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108827013B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114459258B (en) * | 2022-02-15 | 2023-07-14 | 江苏大学 | High-temperature heat storage electric arc furnace flue gas system with waste heat recovery |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736117A (en) * | 2009-12-17 | 2010-06-16 | 上海宝钢工程技术有限公司 | Converter fume high-temperature bag dust removal and recycling and secondary steam recycling system |
| CN101979951A (en) * | 2010-11-23 | 2011-02-23 | 北京世纪源博科技有限责任公司 | Dry dedusting and sensible heat recovery system for electric furnace flue gas |
| CN102183155A (en) * | 2011-03-25 | 2011-09-14 | 宝钢工程技术集团有限公司 | Smoke high-temperature dust removal and steam and coal gas recovery system and method for calcium carbide furnace |
| CN102735071A (en) * | 2012-07-17 | 2012-10-17 | 无锡三达环保科技有限公司 | Waste heat utilizing and dust collecting system for dust collection fan of motor and steam turbine hybrid dragged converter |
| CN104807341A (en) * | 2015-05-20 | 2015-07-29 | 中冶赛迪工程技术股份有限公司 | System and technology for purifying electric furnace flue gas and simultaneously utilizing waste heat |
| CN105890375A (en) * | 2014-12-25 | 2016-08-24 | 王正新 | Metallurgical furnace smoke waste heat utilizing and dust removing method |
| CN208920881U (en) * | 2018-08-16 | 2019-05-31 | 江苏久华环保科技股份有限公司 | Flue gas purification system in continuous charging arc furnace |
-
2018
- 2018-08-16 CN CN201810935072.3A patent/CN108827013B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736117A (en) * | 2009-12-17 | 2010-06-16 | 上海宝钢工程技术有限公司 | Converter fume high-temperature bag dust removal and recycling and secondary steam recycling system |
| CN101979951A (en) * | 2010-11-23 | 2011-02-23 | 北京世纪源博科技有限责任公司 | Dry dedusting and sensible heat recovery system for electric furnace flue gas |
| CN102183155A (en) * | 2011-03-25 | 2011-09-14 | 宝钢工程技术集团有限公司 | Smoke high-temperature dust removal and steam and coal gas recovery system and method for calcium carbide furnace |
| CN102735071A (en) * | 2012-07-17 | 2012-10-17 | 无锡三达环保科技有限公司 | Waste heat utilizing and dust collecting system for dust collection fan of motor and steam turbine hybrid dragged converter |
| CN105890375A (en) * | 2014-12-25 | 2016-08-24 | 王正新 | Metallurgical furnace smoke waste heat utilizing and dust removing method |
| CN104807341A (en) * | 2015-05-20 | 2015-07-29 | 中冶赛迪工程技术股份有限公司 | System and technology for purifying electric furnace flue gas and simultaneously utilizing waste heat |
| CN208920881U (en) * | 2018-08-16 | 2019-05-31 | 江苏久华环保科技股份有限公司 | Flue gas purification system in continuous charging arc furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108827013A (en) | 2018-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110559783B (en) | Device and method for purifying yellow phosphorus furnace gas by low-temperature dry method | |
| CN104129931B (en) | A kind of indirect heating roasting assembly with generating set | |
| CN110121750A (en) | Radioactive waste treatment facility | |
| CN2783142Y (en) | Seal feeding continuous pyrolysis type medical refuse incinerator | |
| CN108827013B (en) | System and method for purifying flue gas in continuous charging electric arc furnace | |
| CN211274055U (en) | Cremation machine tail gas treatment equipment | |
| CN110484283A (en) | A kind of coking residual heat integrative recovery process and system | |
| CN109893997A (en) | Biomass boiler fuel preprocess method, pretreatment unit and denitration method for flue gas | |
| CN105836810B (en) | A kind of acid regeneration station brown iron oxide cooling down processing system | |
| CN218435479U (en) | Two-stage pyrolysis device of many subregion of pressure-fired heating | |
| CN106885276A (en) | A kind of oil flue waste gas gradient utilizes system | |
| CN111545003A (en) | Method for purifying tar in carbon electrode roasting furnace flue gas | |
| CN104588399B (en) | A kind of device of garbage disposal cogeneration | |
| CN103160300B (en) | Modification quality upgrading system of brown coal | |
| CN212327853U (en) | Device for purifying tar in flue gas of carbon electrode roasting furnace | |
| CN105387469A (en) | Electronic waste smelting gasifying device | |
| CN206514306U (en) | Solid waste classification gasification system | |
| CN214813531U (en) | Waste salt disposal system based on high-temperature melting | |
| CN208920881U (en) | Flue gas purification system in continuous charging arc furnace | |
| CN101413045A (en) | Technology for processing and recycling refining converter flue gas | |
| CN105087854B (en) | Converter high-temperature flue gas dry method dust and process waste heat staged reclaimer and method | |
| CN101838716A (en) | Process method and device for converter gas high-temperature dust removal | |
| CN114798664A (en) | Waste salt disposal system and process based on high-temperature melting | |
| CN201756541U (en) | Electric furnace gas purification recycling device | |
| CN106180152B (en) | Decompose the apparatus and method of bioxin and foul smell and heavy metal caused by waste incineration and generating electricity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20240207 Address after: 212312 Jiangsu province Zhenjiang city Danyang city Dan Beizhen back lane Feida Village Applicant after: Jiangsu Zero Carbon Renewable Resources Technology Co.,Ltd. Country or region after: China Address before: 212312 Jiangsu province Zhenjiang city Danyang city Dan Beizhen back lane Feida Village Applicant before: JIANGSU JIUHUA ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Country or region before: China |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |