CN217210408U - Electric furnace flue gas treatment device - Google Patents
Electric furnace flue gas treatment device Download PDFInfo
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- CN217210408U CN217210408U CN202220975435.8U CN202220975435U CN217210408U CN 217210408 U CN217210408 U CN 217210408U CN 202220975435 U CN202220975435 U CN 202220975435U CN 217210408 U CN217210408 U CN 217210408U
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Abstract
The utility model relates to an electric furnace flue gas treatment device, which comprises a combustion settling cylinder, a spray quenching tower, a filtering and dedusting mechanism, a variable frequency fan and a chimney, wherein the combustion settling cylinder is respectively connected with a high-temperature flue gas pipeline for extracting high-temperature flue gas in an electric furnace and a low-temperature flue gas pipeline for extracting lower-temperature flue gas in the electric furnace, the high-temperature flue gas pipeline and the low-temperature flue gas pipeline are respectively connected with a first high-temperature regulating valve and a second high-temperature regulating valve, the combustion settling cylinder is positioned at the high-temperature flue gas pipeline and the low-temperature flue gas pipeline and is connected with an oxygen-assisted heating burner, the combustion settling cylinder and the spray quenching tower are connected on a settling ash hopper, the rear end of the spray quenching tower is sequentially connected with the filtering and dedusting mechanism, the variable frequency fan and the chimney, the electric furnace flue gas treatment device can ensure that toxic substances such as dioxin/furan contained in the flue gas are burned and decomposed, and the temperature can be properly reduced by the flue gas, so that the sticking problem caused by overhigh flue gas temperature of the scrap furnace burden is effectively avoided.
Description
Technical Field
The utility model relates to a dust collector especially relates to an electric stove flue gas processing apparatus.
Background
Currently, along with the increasing severity of the environmental pollution problem in China, the nation also gradually strengthens the attention on the environmental protection work, dioxin is an important environmental pollutant, is called the toxicity in the century, is a persistent organic pollutant naturally formed in the production stage, cannot control pollution by means of forbidden and production forbidden forms, and is listed as a key detection project.
The total amount of dioxin discharged by steel smelting in China accounts for about 40-45% of the total amount of dioxin discharged in China every year, and the dioxin is one of main emission sources, and the electric furnace steelmaking smoke dust is the main dioxin emission source except sintering smoke.
In recent years, the 'short-flow' steelmaking process is rapidly developed, a batch of ultrahigh-power electric furnaces are built in succession, and the smoke and dust amount is remarkably increased along with the increase of the steel yield of the electric furnaces. At present, the technological processes for purifying and utilizing the flue gas of each steel-making electric furnace are largely the same and slightly different, and only the collection mode of the flue gas, the cooling mode of the flue gas and the type of a bag-type dust collector are slightly different.
The CONSTEEL electric furnace and the quantum electric furnace are increasingly adopted by various iron and steel enterprises because scrap steel is continuously added and the waste heat of the recovered flue gas is fully utilized, thereby reducing the power consumption, saving the energy and reducing the cost. Has been adopted in China in a large amount. For the CONSTEEL electric furnace and the quantum electric furnace, whether the flue gas utilization and the purification system normally run or not directly relates to whether the electric furnace is produced smoothly or not; the energy consumption of the flue gas utilization and purification system is high and low, and the cost of electric furnace steelmaking is directly related to the high and low.
The smelting process flow of the CONSTEEL electric furnace and the quantum electric furnace is shown in figure 1:
the generation mechanism of dioxin in the smelting process of the CONSTEEL electric furnace and the quantum electric furnace is as follows:
combining to generate: grease, paint, coating, plastics and the like brought by the steel scrap contain dioxin and dioxin precursors, and the dioxin precursors can be directly subjected to chemical combination reaction in the steel scrap preheating link to generate dioxin, wherein the reaction temperature range is 300-500 ℃.
② thermal decomposition reaction generation: in the process of preheating scrap steel or smelting in an electric furnace, the chlorine-containing high molecular compound is decomposed to generate dioxin through combustion/pyrolysis reaction, and the reaction temperature range is 500-800 ℃.
Thirdly, head-on synthesis: in the smelting process, after the temperature exceeds 800 ℃, dioxin can be thoroughly decomposed, but in the process of cooling flue gas, the dioxin can be generated again through elementary reaction, and the reaction temperature interval is 300-500 ℃.
The dioxin generated by the three ways flows through a combustion settling chamber, a mechanical air cooler or an evaporative cooler and other cooling devices along with the flue gas in sequence, is gradually cooled in a dust removal pipeline, and is finally discharged into a chimney through a bag-type dust remover.
By analyzing the generation mechanism of dioxin in the smelting process of the CONSTEEL electric furnace and the quantum electric furnace, the generation of the dioxin in the smelting process of the CONSTEEL electric furnace and the quantum electric furnace mainly has three types, namely, the combination reaction of raw materials, the thermal decomposition reaction in the combustion process and the de novo synthesis reaction in the temperature reduction process.
Based on the generation mechanism of dioxin in the smelting process of the CONSTEEL electric furnace and the quantum electric furnace, at present, domestic and foreign iron and steel enterprises mainly adopt three methods of source control, process control and terminal control to treat the dioxin, and main engineering application cases comprise four processes of a quenching process, an adsorption process, a catalytic degradation process, a secondary dust removal process and the like.
Source control method (scrap steel sorting pretreatment): the scrap steel is sorted and cleaned, and materials which can generate dioxin are prevented from entering the electric furnace. The method has strong operability and high feasibility. However, the effect is limited by the raw materials.
The process control method comprises the following steps:
the method adopts a flue gas quenching method, rapidly cools the flue gas with the temperature of more than or equal to 800 ℃ to less than 200 ℃ within 2-3 seconds by adopting a quenching measure, and has a large number of enterprises applied at home and abroad at present. The method can obviously reduce the 'de novo synthesis' of the dioxin, but the method has the problems of higher equipment investment, incapability of recovering waste heat, more complex control, easy occurrence of bag pasting and smoke plume problems due to condensation and dewing, and in addition, the problem that the content of the dioxin discharged by flue gas does not reach the standard.
The end control method comprises the following steps: the method specifically comprises the following treatment methods:
firstly, the high-efficiency filtering technology is adopted, and the electric furnace flue gas is filtered and purified by adopting a physical filtering mode, so that the method is adopted by many enterprises at home and abroad. The method has the removal efficiency of more than or equal to 85 percent, but the smoke emission is difficult to reach the standard, and the collected fly ash causes secondary pollution.
Secondly, a physical adsorption method is adopted, which generally adopts a physical adsorption process (spraying an adsorbent) and combines a high-efficiency filtration technology, and a plurality of enterprises are adopted at home and abroad. The method has the advantages of high removal efficiency,
the flue gas emission can reach the standard by more than or equal to 90-99%, but certain problems exist in the subsequent treatment of the adsorbent.
And thirdly, completely catalytically degrading the dioxin by adopting a catalytic decomposition method and using oxides of Ti, W, V and the like as catalysts. The process is still under development. The method has high removal efficiency, and the removal efficiency is not less than 97 ≥ E
99 percent, the flue gas emission can completely reach the standard, but the method has higher catalyst cost, easy poisoning and higher reaction temperature (about 300 ℃).
Fourthly, adopting a low-temperature plasma processing method toThe low-temperature plasma discharge can be used to dissociate gas to generate active radicals (OH, O, N, HO) 2 、O 3 Etc.) and these active groups are capable of oxidizing dioxins. This method is currently in the process of development. The method has obvious effect of removing dioxin, but the plasma generator has high energy consumption, short service life and high cost of a high-power supply.
And fifthly, decomposing dioxin contained in the flue gas by ultraviolet irradiation of the electric furnace flue gas by adopting an ultraviolet photolysis method. This method is currently in the process of development. The method can realize non-toxic, clean and efficient treatment of dioxin, but the technology is mature at present.
Because the dust-containing particle size of the flue gas of the electric furnace is small, the diameter of the flue gas is about 40-300 meshes, and the dust with the particle size can reach the standard only by collecting the dust and discharging by adopting a bag-type dust collector. However, in the electric furnace smelting stage, the temperature in the high-temperature flue reaches 1200 ℃, even though the temperature of the flue of the common dust remover is reduced, the temperature of the smoke gas still reaches 500 ℃ to 800 ℃ before entering the dust remover, obviously exceeds the allowable working temperature of the prior cloth bag dust remover, so the requirement on the dust remover is very high, and the emission cannot reach the environmental protection standard.
At present, the filtering of high-temperature flue gas is carried out in a working environment with a filter bag operating for a long time, and the temperature of the high-temperature flue gas is generally required to be reduced to be less than or equal to 200-250 ℃.
In order to effectively reduce the temperature of the flue gas and effectively eliminate toxic substances such as dioxin/furan and the like, the high-temperature flue gas purification treatment system flow commonly adopted at home and abroad in steel making by a CONSTEEL electric furnace and a quantum electric furnace at present is as follows: high-temperature smoke gas generated in the smelting process of the CONSTEEL electric furnace and the quantum electric furnace is preheated (about 450-650 ℃) → a combustion settling chamber → an evaporative cooler (rapid cooling) → a mixing tower (mixing with roof cover smoke to reduce smoke temperature) → a cloth bag type dust remover (filtering and purifying) → a fan → a chimney and discharging.
The present CONSTEEL electric furnace and quantum electric furnace steelmaking dust removal system has the following defects:
1. the smoke temperature of a continuous steel scrap preheating system of a CONSTEEL electric furnace and a quantum electric furnace is sometimes low (450-650 ℃ is less than 800 ℃), because each steel enterprise pursues electric furnace steelmaking power consumption indexes and higher steel scrap preheating temperature, the temperature entering a quenching device is generally not high (450-650 ℃ is less than 800 ℃), much dioxin is not fully incinerated and decomposed and is still remained in the smoke of the electric furnace, and the quenching device cannot eliminate toxic substances of the dioxin. The dioxin in the flue gas of the electric furnace can not be reliably and stably removed by adopting an evaporative cooler (quenching and cooling) + a bag-type/filter cartridge type dust remover to purify and treat the flue gas, and the dioxin content in the flue gas discharged by the electric furnace can not be ensured to reach the standard.
2. In order to ensure that harmful substances such as dioxin/furan and the like contained in the flue gas of the CONSTEEL electric furnace and the quantum electric furnace are completely incinerated and decomposed, a certain amount of combustible gas needs to be continuously injected and combusted in an auxiliary mode to improve the flue gas temperature (more than 800 ℃) of the CONSTEEL electric furnace and the quantum electric furnace, so the steelmaking cost of the CONSTEEL electric furnace and the quantum electric furnace is increased to a certain extent.
3. When the CONSTEEL electric furnace and the quantum electric furnace are in the oxygen blowing smelting peak, the high-temperature smoke is high in temperature, and the phenomenon that the scrap steel is softened and sticky due to the fact that the scrap steel preheating temperature is too high is often caused in the process of passing through the scrap steel continuous preheating device (or certain low-temperature alloy substances also exist in the scrap steel) and certain influence is caused on the stable operation of the scrap steel continuous preheating conveying device.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide an electric furnace flue gas treatment device to solve one or more of the problems of the prior art.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
the utility model provides an electric stove flue gas processing apparatus, subsides a section of thick bamboo, spraying quench tower, filtration dust removal mechanism, frequency conversion fan and chimney including the burning, the burning is subsided a section of thick bamboo and is connected the high temperature flue gas pipeline that is used for extracting high temperature flue gas in the electric stove and is used for extracting the low temperature flue gas pipeline of lower temperature flue gas in the electric stove respectively, high temperature flue gas pipeline with connect first high temperature governing valve and second high temperature governing valve on the low temperature flue gas pipeline respectively, the burning is subsided a section of thick bamboo and is located high temperature flue gas pipeline and low temperature flue gas pipeline department and be connected with the supplementary intensification combustor of oxygen, the burning is subsided a section of thick bamboo and spraying quench tower and is connected on subsiding the ash bucket, spraying quench tower rear end connects gradually filtration dust removal mechanism, frequency conversion fan and chimney.
As a further improvement of the above technical solution:
the electric furnace is a CONSTEEL electric furnace, the CONSTEEL electric furnace comprises a first electric furnace body and a scrap steel continuous preheating mechanism, a high-temperature flue gas pipe is connected to a furnace cover of the first electric furnace body, and a low-temperature flue gas pipeline is connected to a side wall, far away from one end of the first electric furnace body, of the scrap steel continuous preheating mechanism.
The electric furnace is a quantum electric furnace, the quantum electric furnace comprises a second electric furnace body, a scrap steel waste heat charging shaft furnace and a scrap steel feeding mechanism, the high-temperature flue gas pipeline is connected to the side wall, close to the lower end, of the scrap steel waste heat charging shaft furnace, and the low-temperature flue gas pipeline is connected to the side wall, close to the upper end, of the scrap steel waste heat charging shaft furnace.
The filter dust removal mechanism is connected with one set of auxiliary mechanism, the auxiliary mechanism comprises a powder bin, a high-pressure air blower, a mixer and a pre-spraying powder mechanism, the pre-spraying powder mechanism is arranged at the lower end of each dust removal chamber of the filter dust removal mechanism, the high-pressure air blower and the powder bin are respectively connected with the mixer, and the outlet of the mixer is connected with the pre-spraying powder mechanism.
And the powder bin is connected with the mixer through a variable-frequency screw feeder.
The filter dust removal mechanism is characterized in that a first pressure difference pipe is further connected to a flue gas pipeline connected with a flue gas inlet of the filter dust removal mechanism, the first pressure difference pipe is connected with the upper end of each dust removal chamber of the filter dust removal mechanism through a pressure difference branch pipe, and a first pressure difference meter is connected to the pressure difference branch pipe.
And a second differential pressure pipe is connected between the smoke inlet and the smoke outlet of the filtering and dust removing mechanism, and a second differential pressure meter is connected on the second differential pressure pipe.
And the sedimentation ash bucket and the plurality of dust removal ash buckets connected with the filtering and dust removing mechanism are connected with a pneumatic ash conveying mechanism.
Compared with the prior art, the utility model discloses a beneficial technological effect as follows:
1) the electric furnace flue gas treatment device is used for respectively extracting high-temperature flue gas and low-temperature flue gas in an electric furnace through a high-temperature flue gas pipeline and a low-temperature flue gas pipeline, the high-temperature flue gas pipeline and the low-temperature flue gas pipeline are respectively connected with a first high-temperature regulating valve and a second high-temperature regulating valve, two paths of flue gas can be regulated according to different smelting working conditions of the electric furnace in different proportions, the flue gas temperature is always kept to be more than or equal to 800 ℃ under the action of an aerobic auxiliary burner in a combustion settling cylinder arranged behind the electric furnace, and the flue gas is retained in a mixed combustion settling cylinder for 2-3s, so that toxic substances such as dioxin/furan and the like contained in the flue gas are burnt and decomposed;
2) the high-temperature flue gas in the electric furnace can be extracted in the high-temperature flue gas pipeline, the temperature of the flue gas in the electric furnace is properly reduced, and the sticking problem caused by overhigh flue gas temperature of the scrap furnace burden in the continuous scrap preheating mechanism is effectively avoided;
3) the filtering and dedusting mechanism is connected with the auxiliary mechanism, and can pre-spray a powder ash layer with a certain thickness on the surfaces of a cloth bag and a filter cylinder in the filtering and dedusting mechanism, so that toxic substances such as dioxin/furan and the like remaining in the flue gas of the electric furnace can be more thoroughly filtered and adsorbed, the flue gas emission of the electric furnace is ensured to reach the standard, and the problem of bag pasting caused by condensation and dewing of filter materials of a filtering and dedusting device can be effectively avoided;
4) the flue gas pipeline connected with the flue gas inlet of the filtering and dust removing mechanism is also connected with a first pressure difference pipe, the first pressure difference pipe is connected with the upper end of each dust removing chamber of the filtering and dust removing mechanism through a pressure difference branch pipe, and the pressure difference branch pipe is connected with a first pressure difference meter which can detect the pressure difference among the dust removing chambers so as to judge whether the thickness of a fine powder ash layer outside a cloth bag or a filter cylinder in the dust removing chamber reaches the standard or not;
5) and a second differential pressure pipe is connected between the flue gas inlet and the flue gas outlet of the filtering and dust removing mechanism, and a second differential pressure meter is connected on the second differential pressure pipe, so that the differential pressure between the flue gas inlet and the flue gas outlet can be detected, and whether the filtering and dust removing mechanism needs to perform ash removal operation or not is judged.
Drawings
FIG. 1 shows a flow chart of a smelting process of a traditional CONSTEEL electric furnace and a quantum electric furnace.
Fig. 2 shows a schematic structural diagram of a smoke treatment device of the CONSTEEL electric furnace in the first embodiment.
Fig. 3 is a schematic structural diagram showing an auxiliary mechanism of the smoke treatment device of the CONSTEEL electric furnace in the first embodiment.
Fig. 4 shows a schematic structural diagram of a smoke treatment device of a quantum electric furnace in a second embodiment.
In the drawings, the reference numbers:
1. a CONSTEEL electric furnace; 101. a first electric furnace body; 102. a scrap steel continuous preheating mechanism; 2. a quantum electric furnace; 201. a second electric furnace body; 202. a scrap steel waste heat charging shaft furnace; 203. a scrap steel feeding mechanism; 3. a combustion settling drum; 31. a settling ash bucket; 32. an aerobic auxiliary heating combustor; 4. a filtering and dedusting mechanism; 41. a dust removal ash bucket; 44. a first differential pressure tube; 441. a first differential pressure gauge; 45. a second differential pressure tube; 451. a second differential pressure gauge; 5. a variable frequency fan; 6. a chimney; 7. a pneumatic ash conveying mechanism; 8. a spray quench tower; 9. an auxiliary mechanism; 91. a powder bin; 92. a high pressure blower; 93. a mixer; 94. a powder pre-spraying mechanism; 95. a variable frequency screw feeder; 10. a first high temperature regulating valve; 11. a second high temperature regulating valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following device of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are not to precise scale, and are provided for the purpose of facilitating and clearly illustrating embodiments of the present invention. To make the objects, features and advantages of the present invention more comprehensible, please refer to the accompanying drawings. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limitation of the implementation of the present invention, so that the present invention does not have the essential significance in technology, and any modification of the structure, change of the ratio relationship or adjustment of the size should fall within the scope of the technical content disclosed in the present invention without affecting the function and the achievable purpose of the present invention.
Example one
As shown in fig. 2 and fig. 3, the electric furnace flue gas treatment device of the present embodiment is applied to a CONSTEEL electric furnace 1, the CONSTEEL electric furnace 1 includes a first electric furnace body 101 and a scrap continuous preheating mechanism 102, the flue gas treatment device includes a combustion settling cylinder 3, a spray quenching tower 8, a filter dust removal mechanism 4, a variable frequency fan 5 and a chimney 6, a furnace cover of the first electric furnace body 101 is connected with the combustion settling cylinder 3 through a high temperature flue gas pipeline, the scrap continuous preheating mechanism 102 is connected with the combustion settling cylinder 3 through a low temperature flue gas pipeline, the high temperature flue gas pipeline and the low temperature flue gas pipeline are respectively connected with a first high temperature regulating valve 10 and a second high temperature regulating valve 11, the combustion settling cylinder 3 is located at the high temperature flue gas pipeline and the low temperature flue gas pipeline and is connected with an oxygen-assisted warming burner 32, the combustion settling cylinder 3 is connected with a quench ash settling hopper 31, the spray quenching tower 8 is also connected with the quench ash settling hopper 31, and the spray tower 8 is connected with a flue gas inlet of the filter dust removal mechanism 4, the flue gas outlet of the filtering and dedusting mechanism 4 is connected with the variable frequency fan 5 and the chimney 6, each dedusting chamber of the filtering and dedusting mechanism 4 is connected with the dedusting ash bucket 41, and the settling ash bucket 31 and the dedusting ash bucket 41 are both connected with the pneumatic ash conveying mechanism 7.
The filter dust-removing mechanism 4 is connected with an auxiliary mechanism 9, the auxiliary mechanism 9 comprises a powder bin 91, a high-pressure blower 92, a mixer 93 and a pre-spraying powder mechanism 94, the pre-spraying powder mechanism 94 is arranged at the lower end of each dust removing chamber of the filter dust-removing mechanism 4, the high-pressure blower 92 is connected with the mixer 93, the powder bin 91 is connected with the mixer 93 through a variable-frequency screw feeder 95 and can quantitatively convey fine powder to be mixed with air, the outlet of the mixer 93 is connected with the pre-spraying powder mechanism 94, a fine powder ash layer with certain thickness can be pre-sprayed outside a cloth bag or a filter cylinder of the filter dust-removing mechanism 4 through the pre-spraying powder mechanism 94, and the fine powder is made of Ca (OH) 2 The fine powder and the active carbon fine powder are mixed, and the fine powder layer is sprayed, so that toxic substances such as dioxin, furan and the like which are left in the flue gas of the electric furnace are filtered and adsorbed more thoroughly, and the problem of bag pasting caused by condensation and dewing of filter materials can be avoided.
Still connect first pressure differential pipe 44 on the flue gas pipeline of filtering dust removal mechanism 4 flue gas inlet connection, first pressure differential pipe 44 is connected with every clean room upper end of filtering dust removal mechanism 4 through the pressure differential branch pipe, connect first pressure differential table 441 on the pressure differential branch pipe, can filter the pressure differential between the each clean room of dust removal mechanism 4 through first pressure differential table 441, thereby detect the pressure drop of flue gas through each clean room, whether the audio-visual judgement sack in each clean room of accessible pressure differential or the powder ash layer thickness outside straining a section of thick bamboo reach standard.
The second pressure difference tube 45 is connected between the flue gas inlet and the flue gas outlet of the filtering and dust removing mechanism 4, the second pressure difference meter 451 is connected on the second pressure difference tube 45, the pressure difference between the flue gas inlet and the flue gas outlet of the filtering and dust removing mechanism 4 can be detected through the second pressure difference meter 451, and whether the filtering and dust removing mechanism 4 needs dust cleaning operation or not can be visually judged through the pressure difference value, so that the filtering and dust removing mechanism 4 can clean dust timely.
When the electric furnace flue gas treatment device of the embodiment is used, before the CONSTEEL electric furnace 1 is put into operation or before the electric furnace is stopped to remove ash and then operates again, the auxiliary mechanism 9 and the variable frequency fan 5 need to be started first, fine powder and air are mixed in the mixer 93 and then enter the dust removing chamber of the filtering and dust removing mechanism 4, a fine powder ash layer with a certain thickness is sprayed on the outer side of a cloth bag or a filter cylinder in the dust removing chamber, when the pressure difference value of the first pressure difference meter 441 reaches a set value, the thickness of the fine powder ash layer reaches the standard, the auxiliary mechanism 9 and the variable frequency fan 5 can be closed, and the spraying work of the powder ash layer is completed:
after the spraying of the fine powder ash layer is finished, the CONSTEEL electric furnace 1 can be started, the flue gas generated by the CONSTEEL electric furnace 1 is treated, the variable frequency fan 5 is started, meanwhile, the opening degrees of the first high-temperature regulating valve 10 and the second high-temperature regulating valve 11 are regulated according to the smelting working condition of the CONSTEEL electric furnace 1, the high-temperature flue gas in the first electric furnace body 101 and the lower-temperature flue gas generated by the waste steel continuous preheating mechanism 102 are respectively extracted, the flue gas is mixed in the combustion settling cylinder 3 and is supported by the aerobic auxiliary heating combustor 32 for combustion, the temperature of the flue gas is ensured to be more than or equal to 800 ℃ and is retained in the combustion settling cylinder 3 for 2-3s, toxic substances such as dioxin/furan and the like in the flue gas are effectively burned and decomposed at high temperature, and the ash generated by burning is settled in the settling ash hopper 31 and is conveyed to an ash warehouse for collection through the pneumatic ash conveying mechanism 7;
introducing the flue gas generated after incineration into a spray quenching tower 8, and simultaneously spraying water mist into the spray quenching tower 8 to perform quenching cooling operation on the flue gas;
the flue gas after quenching and cooling enters a filtering and dust removing mechanism 4, the flue gas is filtered and intercepted by a cloth bag or a filter drum in the filtering and dust removing mechanism 4, and the flue gas is filtered and purified by the filtering and dust removing mechanism 4, and then is discharged through a variable frequency fan 5 and a chimney 6;
after the filtering and dust removing mechanism 4 performs dust removing operation for a period of time, the pressure difference between the smoke inlet and the smoke outlet of the filtering and dust removing mechanism 4 is continuously increased, the pressure difference is detected by the second pressure difference meter 451, when the pressure difference is increased to a set value, the dust removing operation can be started, the dust removing mechanism (pulse blowing and the like) is used for removing dust, particles outside the cloth bag or the filter cylinder fall into the dust removing ash bucket 41, and ash materials in the dust removing ash bucket 41 can also be conveyed to an ash warehouse through the pneumatic ash conveying mechanism 7 to be collected.
Example two
As shown in fig. 4, the electric furnace flue gas treatment device of the present embodiment is applied to a quantum electric furnace 2, and the difference from the first embodiment lies in that the quantum electric furnace 2 includes a second electric furnace body 201, a scrap steel waste heat charging shaft furnace 202 and a scrap steel feeding mechanism 203, the scrap steel waste heat charging shaft furnace 202 is connected to a combustion settling drum 3 through a high temperature flue gas pipeline by a lower end side wall, the scrap steel waste heat charging shaft furnace 202 is connected to the combustion settling drum 3 through a low temperature flue gas pipeline by an upper end side wall, and similarly, according to different smelting conditions of the quantum electric furnace 2, mixing of high temperature flue gas and low temperature flue gas is realized by adjusting the opening degrees of a first high temperature regulating valve 10 and a second high temperature regulating valve 11 on the high temperature flue gas pipeline and the low temperature flue gas pipeline, so as to adjust the flue gas temperature, and the subsequent flue gas treatment operation is the same as the operation steps of the first embodiment.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes and modifications can be made, which shall all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. The utility model provides an electric stove flue gas processing apparatus which characterized in that: subside a section of thick bamboo, spraying quench tower, filtration dust removal mechanism, variable frequency fan and chimney including the burning, the burning subsides a high temperature flue gas pipeline that a section of thick bamboo connects the high temperature flue gas that is used for extracting high temperature flue gas in the electric stove respectively and is used for extracting the low temperature flue gas pipeline of lower temperature flue gas in the electric stove, high temperature flue gas pipeline with connect first high temperature governing valve and second high temperature governing valve on the low temperature flue gas pipeline respectively, the burning subsides a section of thick bamboo and is located high temperature flue gas pipeline and low temperature flue gas pipeline department and connect the supplementary intensification combustor of aerobic, a burning subsides a section of thick bamboo and spraying quench tower connection and subsides on the ash bucket, spraying quench tower rear end connects gradually filtration dust removal mechanism, variable frequency fan and chimney.
2. The electric furnace flue gas treatment device according to claim 1, characterized in that: the electric furnace is a CONSTEEL electric furnace, the CONSTEEL electric furnace comprises a first electric furnace body and a scrap steel continuous preheating mechanism, a high-temperature flue gas pipe is connected to a furnace cover of the first electric furnace body, and a low-temperature flue gas pipeline is connected to a side wall, far away from one end of the first electric furnace body, of the scrap steel continuous preheating mechanism.
3. The electric furnace flue gas treatment device according to claim 1, characterized in that: the electric furnace is a quantum electric furnace, the quantum electric furnace comprises a second electric furnace body, a scrap steel waste heat charging shaft furnace and a scrap steel feeding mechanism, the high-temperature flue gas pipeline is connected to the side wall, close to the lower end, of the scrap steel waste heat charging shaft furnace, and the low-temperature flue gas pipeline is connected to the side wall, close to the upper end, of the scrap steel waste heat charging shaft furnace.
4. The electric furnace flue gas treatment device according to claim 1, characterized in that: the filter dust removal mechanism is connected with one set of auxiliary mechanism, the auxiliary mechanism comprises a powder bin, a high-pressure air blower, a mixer and a pre-spraying powder mechanism, the pre-spraying powder mechanism is arranged at the lower end of each dust removal chamber of the filter dust removal mechanism, the high-pressure air blower and the powder bin are respectively connected with the mixer, and the outlet of the mixer is connected with the pre-spraying powder mechanism.
5. The electric furnace flue gas treatment device according to claim 4, characterized in that: and the powder bin is connected with the mixer through a variable-frequency screw feeder.
6. The electric furnace flue gas treatment device according to claim 4, characterized in that: the filter dust removal mechanism is characterized in that a first pressure difference pipe is further connected to a flue gas pipeline connected with a flue gas inlet of the filter dust removal mechanism, the first pressure difference pipe is connected with the upper end of each dust removal chamber of the filter dust removal mechanism through a pressure difference branch pipe, and a first pressure difference meter is connected to the pressure difference branch pipe.
7. The electric furnace flue gas treatment device according to claim 1, characterized in that: and a second differential pressure pipe is connected between the smoke inlet and the smoke outlet of the filtering and dust removing mechanism, and a second differential pressure meter is connected on the second differential pressure pipe.
8. The electric furnace flue gas treatment device according to claim 1, characterized in that: and the sedimentation ash bucket and the plurality of dust removal ash buckets connected with the filtering and dust removing mechanism are connected with a pneumatic ash conveying mechanism.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220975435.8U CN217210408U (en) | 2022-04-25 | 2022-04-25 | Electric furnace flue gas treatment device |
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| CN202220975435.8U CN217210408U (en) | 2022-04-25 | 2022-04-25 | Electric furnace flue gas treatment device |
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