CN217110530U - Electric furnace flue gas ultra-clean treatment system - Google Patents

Abstract

The utility model relates to an electric stove flue gas ultra-clean processing system, subside a section of thick bamboo, quench tower and sack cleaner including scrap steel preheating device, burning, still include dioxin catalytic decomposition device, dioxin catalytic decomposition device's air intake and the air outlet intercommunication of sack cleaner, dioxin catalytic decomposition device still has heating portion, and heating portion has first opening and second opening, first opening and bell intercommunication, and the air intake intercommunication of a section of thick bamboo is subsided with the burning to the second opening. It utilizes first flue gas to carry out preheating treatment to the scrap steel, utilizes the heat heating of second flue gas to mix the flue gas, makes and mixes the flue gas and heat up to the temperature interval that is suitable for dioxin catalytic decomposition device catalysis dioxin to decompose, make full use of the heat of first flue gas and second flue gas to utilize dioxin catalytic decomposition device fully to decompose the dioxin in the mixed flue gas, avoid mixing the environmental pollution after the flue gas discharges.

Description

Electric furnace flue gas ultra-clean treatment system

Technical Field

The utility model relates to an electric stove gas cleaning's field especially relates to an electric stove flue gas ultra-clean processing system.

Background

The electric furnace flue gas purification treatment process widely adopted in the steel making process at present is as follows: firstly, high-temperature flue gas is extracted from a furnace cover of an electric furnace and is subjected to preheating treatment on scrap steel by a scrap steel preheating device to obtain the temperature of 800 to up to

Pretreating flue gas at 1000 ℃; and then guiding the pretreated flue gas to pass through a combustion settling cylinder, removing dioxin in the flue gas in a combustion mode, or catalytically decomposing the dioxin in the pretreated flue gas by using a dioxin catalytic decomposition device. Then the flue gas is sent into a quenching tower which sprays water for quenching; mixing the quenched flue gas with the flue gas collected in the electric furnace closed cover, feeding the mixture into a bag-type dust collector, removing furnace dust in the flue gas, and finally discharging the flue gas into the atmosphere, wherein the temperature of the quenched flue gas is required to be less than 250 ℃ in order to avoid the high-temperature flue gas from damaging the structure in the bag-type dust collector.

The process has the core points that: a large amount of water is needed to rapidly cool the high-temperature flue gas, so as to avoid the rapid synthesis temperature range (namely the temperature range of 250-450 ℃) of the dioxin as much as possible. However, this process has the following disadvantages:

1. in the process of reducing the temperature of the flue gas from 800 ℃ to 250 ℃, the waste heat of the flue gas cannot be effectively utilized, so that the waste of the heat of the flue gas of the electric furnace is caused;

2. a large amount of water is needed for cooling, and a large amount of cooling water is wasted;

3. in the process of quenching, a part of dioxin can be synthesized in the flue gas again (the temperature range of the synthesized dioxin is 300-500 ℃);

4. in the process of treating the flue gas, the active carbon fine powder is generally sprayed by a flow-carrying type as an adsorbent to adsorb dioxin in the flue gas, so that the collected furnace ash contains a large amount of dioxin, and the furnace ash can be only treated by hazardous wastes, thereby causing resource waste;

5. the cooling water can become vapor in the cooling process, the flue gas flow is obviously increased, and the fan load is improved. In addition, the problem of bag pasting of the bag-type dust collector caused by water vapor in the smoke can also occur.

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 ultra-clean treatment system to solve one or more problems in 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 ultra-clean processing system, includes scrap steel preheating device, combustion settling cylinder, quench tower and sack cleaner, still includes dioxin catalytic decomposition device, dioxin catalytic decomposition device's air intake with the air outlet intercommunication of sack cleaner, dioxin catalytic decomposition device still has heating portion, heating portion has first opening and second opening, first opening and bell intercommunication, the second opening with the air intake intercommunication of combustion settling cylinder.

Furthermore, the combustion settling cylinder is communicated with the furnace cover.

Furthermore, in the flowing direction of the flue gas of the electric furnace, a first regulating valve is arranged between the scrap steel preheating device and the combustion settling cylinder, a second regulating valve is arranged between the furnace cover and the first opening, and a third regulating valve is arranged between the scrap steel preheating device and the combustion settling cylinder.

Further, still include first temperature sensor, second temperature sensor and controller, wherein:

the first temperature sensor is used for measuring the temperature of the flue gas flowing into the bag-type dust collector;

the second temperature sensor is used for measuring the temperature of the flue gas flowing out of the air outlet of the dioxin catalytic decomposition device;

and the controller is externally connected with an alarm device, controls the operation of the alarm device according to the temperature of the flue gas flowing into the bag-type dust collector, and controls the operation of the second regulating valve according to the temperature of the flue gas flowing out of the air outlet of the dioxin catalytic decomposition device.

Furthermore, a pressure difference detection device is arranged between an air inlet and an air outlet of the bag-type dust collector and used for measuring pressure difference data before and after smoke flows through the bag-type dust collector, and the controller controls the alarm device to operate according to the pressure difference data.

Furthermore, a first chamber and a second chamber which are communicated with each other are arranged in the combustion settling cylinder, an air inlet and an air outlet of the combustion settling cylinder are respectively arranged on the top walls of the first chamber and the second chamber, and the air inlet of the combustion settling cylinder is higher than the air outlet of the combustion settling cylinder.

Further, the quenching tower comprises a plurality of quenching waste heat boilers which are connected in parallel.

Furthermore, the bottom end of the heating part is communicated with a first pneumatic conveying device, and the combustion settling tower is communicated with a second pneumatic conveying device.

Further, the first opening is arranged at the top end of the heating part, and the second opening is arranged at the bottom end of the side face of the heating part.

Furthermore, an ash hopper of the bag-type dust collector is communicated with a third pneumatic conveying device, and the first pneumatic conveying device, the second pneumatic conveying device and the third pneumatic conveying device are communicated with an ash storehouse.

Compared with the prior art, the utility model discloses a beneficial technological effect as follows:

the flue gas that (one) bell flow direction scrap steel preheating device and heating portion is first flue gas and second flue gas respectively, and the second flue gas flows through the heating portion, mixes in the burning settling leg with first flue gas for mixed flue gas to the dioxin in the mixed flue gas is detached to the mode of burning. And then the mixed flue gas is subjected to quenching treatment of a quenching tower, enters a bag-type dust collector and is subjected to filtering treatment, and finally the mixed flue gas enters a dioxin catalytic decomposition device. The second flue gas heats the dioxin catalytic decomposition device, so that the mixed flue gas is heated to the temperature of 300-400 ℃, the device is suitable for decomposing residual dioxin in the mixed flue gas catalyzed by the dioxin catalytic decomposition device, and the dioxin in the mixed flue gas can be removed before the mixed flue gas is discharged. In this scheme, utilize first flue gas to carry out preheating treatment to the scrap steel, utilize the heat heating of second flue gas to mix the flue gas, make mixed flue gas heat up to the temperature interval that is suitable for dioxin catalytic decomposition device catalysis dioxin to decompose, make full use of the heat of first flue gas with the second flue gas to utilize dioxin catalytic decomposition device fully to decompose the dioxin in the mixed flue gas, avoid mixing the environmental pollution after the gas fume emission.

And (II) the combustion settling cylinder is directly communicated with the furnace cover, the flue gas flowing to the combustion settling cylinder from the furnace cover is third flue gas, and the third flue gas is mixed into the mixed flue gas, so that the temperature of the mixed flue gas can be increased, and the mixed flue gas can be ignited conveniently.

And (III) the first regulating valve, the second regulating valve and the third regulating valve are respectively used for controlling the flow rates of the first flue gas, the second flue gas and the third flue gas, so that the mixed flue gas temperature in the dioxin catalytic decomposition device and the mixed flue gas temperature in the combustion settling cylinder are regulated.

And (IV) the mixed flue gas is combusted in the first chamber, then the mixed flue gas flows to the second chamber, the generated impurities and the impurities in the mixed flue gas directly fall to the bottom end of the combustion settling cylinder, and the impurities in the flue gas can be preliminarily removed, so that the amount of the dioxin regenerated in the quenching process is reduced.

And (V) the quenching waste heat boiler can absorb and utilize heat in the mixed flue gas, promote the mixed flue gas to be cooled, and avoid the internal structure of the bag-type dust collector from being damaged due to overhigh temperature of the mixed flue gas. The utilization of the quenching waste heat boiler not only saves water resources, but also can not mix water vapor into the mixed flue gas, thereby avoiding the problem of bag pasting of the bag-type dust collector. In addition, a plurality of rapid cooling waste heat boilers are connected in parallel, a large amount of mixed flue gas can be processed simultaneously, the workload of each rapid cooling waste heat boiler is reduced, and the mixed flue gas cooling is accelerated.

Drawings

FIG. 1 shows a schematic structural diagram of an electric furnace flue gas ultra-clean treatment system in an embodiment of the present invention;

fig. 2 shows a schematic structural diagram of a catalytic decomposition device for dioxin in the embodiment of the present invention.

In the drawings, the reference numbers:

1. a furnace cover; 11. a scrap preheating device; 111. a first conduit; 112. a first regulating valve; 12. a second conduit; 121. a second regulating valve; 13. a third pipeline; 131. a third regulating valve; 2. a combustion settling drum; 2a, a first chamber; 2b, a second chamber; 21. a second pneumatic conveying device; 3. a quenching exhaust-heat boiler; 4. a bag-type dust collector; 41. a first temperature sensor; 42. a differential pressure detecting device; 43. a differential pressure detection assembly; 44. a third pneumatic conveying device; 5. a barrel; 51. a guide section; 52. a first cartridge; 521. a second cartridge; 53. an exhaust section; 54. a tapered portion; 55. a first pneumatic conveying device; 56. a second temperature sensor; 6. a controller; 7. a chimney; 71. a fan.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following description will be made in detail with reference to the accompanying drawings and the following detailed description of the present invention. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. To make the objects, features and advantages of the present invention more comprehensible, please refer to the attached 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 the technology, and any modification of the structure, change of the ratio relationship or adjustment of the size should still 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.

Examples

Referring to fig. 1 and 2, the present application provides an electric furnace flue gas ultra-clean treatment system, which includes a dioxin catalytic decomposition device, and a scrap steel preheating device 11, a combustion settling cylinder 2, a quench tower, and a bag-type dust collector 4, which are sequentially communicated. One end of the scrap steel preheating device 11 is communicated with the furnace cover 1, and a first pipeline 111 is arranged between the other end of the scrap steel preheating device and the combustion settling cylinder 2 for communication. An air inlet of the dioxin catalytic decomposition device is communicated with an air outlet of the bag-type dust collector 4, and an air outlet of the dioxin catalytic decomposition device is communicated with a fan 71 and a chimney 7. The dioxin catalytic decomposition device is provided with a heating part, the heating part is provided with a first opening and a second opening, a second pipeline 12 is arranged between the first opening and the furnace cover 1 to be communicated, and the second opening is communicated with an air inlet of the combustion settling cylinder 2. In addition, a third pipeline 13 is arranged between the combustion settling cylinder 2 and the furnace cover 1 for communication. In this embodiment, the furnace cover 1 is communicated with an air outlet pipe, and the second pipe 12 and the third pipe 13 are communicated with the air outlet pipe in a parallel connection mode.

When the electric furnace is in operation, the flue gas extracted by the cylinder cover is divided into three paths, namely first flue gas in the first pipeline 111, second flue gas in the second pipeline 12 and third flue gas in the third pipeline 13. Preheating the scrap steel in a scrap steel preheating device 11 by the first flue gas; the second flue gas flows through the heating part and heats the dioxin catalytic decomposition device, and in the process, the temperatures of the first flue gas and the second flue gas are both reduced. And then the first flue gas and the second flue gas are converged into the combustion settling cylinder 2, the third flue gas directly flows into the combustion settling cylinder 2 and is mixed with the first flue gas and the second flue gas to form mixed flue gas, and the third flue gas can improve the temperature of the mixed flue gas, so that the mixed flue gas is convenient to ignite, and dioxin in the flue gas is removed. Then the mixed flue gas flows to a quenching tower to be subjected to quenching treatment, and impurities in the mixed flue gas and impurities formed by combustion directly fall to the bottom of the combustion settling barrel 2. In the quenching process, the heavy metal dust in the impurities can catalyze substances in the mixed flue gas to regenerate a part of dioxin. In this embodiment, the mixed flue gas is burnt in the combustion settling cylinder 2, and the sundries (the furnace dust containing the heavy metal dust) in the mixed flue gas and the sundries generated by the burning directly fall to the bottom end of the combustion settling cylinder 2, so that the sundries in the flue gas can be preliminarily removed, the heavy metal dust in the mixed flue gas in the quenching process is reduced, and the amount of the dioxin regenerated in the quenching process is reduced.

The mixed flue gas after the quenching treatment enters a bag-type dust collector 4, and impurities in the mixed flue gas are filtered by the bag-type dust collector 4. Mix the flue gas afterwards and get into dioxin catalytic decomposition device, exchange the heat with the second flue gas and be heated, heat to being suitable for the temperature range that dioxin catalytic decomposition device catalyzes the decomposition of dioxin mixing the flue gas with mixing the flue gas, and by the abundant decomposition processing of residual dioxin in the flue gas with mixing the dioxin catalytic decomposition device, mix the flue gas afterwards and flow from the air outlet of dioxin catalytic decomposition device, can directly discharge, because debris in the mixed flue gas has been strained, it is difficult to regenerate the dioxin to mix the flue gas in dioxin catalytic decomposition device.

Referring to fig. 1 and 2, in particular, the catalytic decomposition device for dioxin includes a hollow cylinder 5, a hollow guide portion 51 is installed in the cylinder 5, and the guide portion 51 is communicated with an outer side wall of the cylinder 5 to form an air inlet of the catalytic decomposition device for dioxin. The roof of barrel 5 has four first section of thick bamboo 52 along vertical direction welding, and the top of first section of thick bamboo 52 seals the setting, and the bottom of first section of thick bamboo 52 communicates with the inner wall of guide 51. The second cylinder 521 is installed in the first cylinder 52, the axis of the first cylinder 52 coincides with the axis of the second cylinder 521, and the second cylinder 521 is filled with a catalyst filler for catalyzing decomposition of dioxin, wherein in the embodiment, the catalyst filler mainly comprises oxides such as TiO2, V2O5, WO3 and the like. The top of the second tube 521 communicates with the top surface of the tube 5, the top surface of the tube 5 is bolted with the exhaust part 53, the top of the second tube 521 communicates with the inner cavity of the exhaust part 53, and the sidewall of one side of the exhaust part 53 is provided with a notch, which is the air outlet of the dioxin catalytic decomposition device.

In addition, install dioxin catalytic decomposition device behind sack cleaner 4, mixed flue gas has been filtered out debris before getting into dioxin catalytic decomposition device, can avoid debris in the mixed flue gas to block up the space of catalyst filler, avoids catalyst filler poisoning, improves the life of catalyst filler and the efficiency of desorption dioxin.

Referring to fig. 1 and 2, in the present embodiment, a space formed between an inner wall of the cylinder 5 and an outer side surface of the first cylinder 52 and an outer side surface of the guiding portion 51 is a heating portion, a first opening and a second opening are both opened on a side surface of the cylinder 5, the first opening is disposed at a top end of the side surface of the cylinder 5, and the second opening is disposed at a bottom end of the side surface of the cylinder 5. The bottom of the cylinder 5 is concave downwards to form a conical part 54, and when the second flue gas flows in the cylinder 5, a part of impurities directly fall into the conical part 54.

Referring to fig. 1, specifically, the system further includes a first adjusting valve 112 installed on the first pipeline 111, a second adjusting valve 121 installed on the second pipeline 12, and a third adjusting valve 131 installed on the third pipeline 13, where the first adjusting valve 112, the second adjusting valve 121, and the third adjusting valve 131 are respectively used for adjusting flow rates of the first flue gas, the second flue gas, and the third flue gas, and by adjusting the flow rate of the flue gas, an operation mode of the processing system can be changed, for example, the flow rate of the third flue gas is increased, a proportion of the third flue gas in the mixed gas can be increased, and a temperature of the mixed gas in the combustion settling cylinder 2 can be adjusted, so that the mixed gas is suitable for ignition. In addition, the flow velocity of the second flue gas is controlled, the heating effect of the second flue gas on the mixed flue gas in the dioxin decomposition device can be adjusted, so that the temperature of the mixed flue gas in the dioxin decomposition device is changed, the dioxin decomposition device is suitable for catalyzing the decomposition of the dioxin, the flow velocity of the second flue gas is increased, the temperature of the mixed flue gas in the dioxin decomposition device can be increased, the flow velocity of the second flue gas is reduced, and the temperature of the mixed flue gas in the dioxin decomposition device can be reduced.

Referring to fig. 1, further, if the temperature of the mixed flue gas entering the bag-type dust collector 4 is too high, the internal components of the bag-type dust collector 4 may be damaged. The mixed flue gas is in dioxin catalytic decomposition device, if mixed flue gas temperature breaks away from the scope that the dioxin regenerated again, then be not convenient for clear up abundant the dioxin of remaining in the gas mixture. In order to solve the above problems, the electric furnace flue gas ultra-clean treatment system further comprises a first temperature sensor 41 arranged at the air inlet of the bag-type dust collector 4, a second temperature sensor 56 arranged at the air outlet of the dioxin catalytic decomposition device and a controller 6, wherein:

the first temperature sensor 41 is used for measuring the temperature of the flue gas flowing into the bag-type dust collector 4 and recording the temperature as first temperature data;

the second temperature sensor 56 is used for measuring the temperature of the flue gas flowing out of the air outlet of the dioxin catalytic decomposition device and recording the temperature as second temperature data;

the controller 6 is externally connected with an alarm device (not shown in the figure), and the controller 6 controls the operation of the alarm device according to the first temperature data and controls the operation of the second regulating valve 121 according to the second temperature data. If first temperature data is too high, then need the staff to adjust the maintenance to the quench tower to guarantee that the mixed flue gas of quench tower outflow is by abundant cooling. If the second temperature data is out of the temperature range (300-400 ℃) suitable for decomposition of the dioxin catalyzed by the dioxin catalytic decomposition device, it is difficult to ensure that the dioxin in the mixed flue gas is sufficiently decomposed, so that the second regulating valve 121 needs to be regulated to change the temperature of the mixed flue gas and the second flue gas in the dioxin catalytic decomposition device after heat exchange. In this embodiment, the alarm device is an alarm lamp.

Referring to fig. 1, further, a pressure difference detection device 42 is further installed between the air inlet and the air outlet of the bag-type dust collector 4, and a pressure difference detection assembly 43 is also installed between two ends of each chamber of the bag-type dust collector 4, in this embodiment, the pressure difference detection device 42 and the pressure difference detection assembly 43 are both pressure difference meters, and the pressure difference detection device 42 and the pressure difference detection assembly 43 are both electrically connected to the controller 6. Utilize pressure differential detection device 42 and pressure differential detection subassembly 43 can detect the pressure differential data around the flue gas flows through sack cleaner 4 and each bin of sack cleaner 4, if the pressure differential data around the flue gas flows through sack cleaner 4 or a certain bin of sack cleaner 4 is too big, then explain sack cleaner 4 inner structure if take place to block up in certain bin, controller 6 then controls alarm device operation, reminds the staff to maintain sack cleaner 4.

Referring to fig. 1, specifically, the combustion settling cylinder 2 has a first chamber 2a and a second chamber 2b, the first chamber 2a is communicated with the second chamber 2b, and a third pipe 13 is communicated with the top end of the inner wall of the first chamber 2 a. The air intake of the combustion settling cylinder 2 is arranged on the top wall of the first chamber 2a, the air outlet of the combustion settling cylinder 2 is arranged on the top wall of the second chamber 2b, and in this embodiment, the air intake of the combustion settling cylinder 2 is higher than the air outlet of the combustion settling cylinder 2. The first flue gas, the second flue gas and the third flue gas are mixed in the first chamber 2a to form mixed flue gas, the mixed flue gas is ignited in the first chamber 2a to remove dioxin in the mixed flue gas in a combustion mode, and then impurities in the mixed flue gas and impurities formed by combustion directly fall to the bottom of the combustion settling cylinder 2.

Referring to fig. 1, the quenching tower includes four quenching exhaust-heat boilers 3 installed in a vertical direction, and the four quenching exhaust-heat boilers 3 are installed in parallel at an air outlet of the combustion settling drum 2. The quenching waste heat boiler 3 can absorb and utilize heat in the mixed flue gas, promote the mixed flue gas to cool, and avoid the internal structure of the bag-type dust collector 4 from being damaged due to overhigh temperature of the mixed flue gas. The utilization of the quenching waste heat boiler 3 saves water resources and avoids the problem that the bag-type dust collector 4 is stuck with the bag because water vapor cannot be mixed into the mixed flue gas. In addition, four quenching exhaust-heat boilers 3 are connected in parallel, can handle a large amount of mixed flue gas simultaneously, reduce the work load of every quenching exhaust-heat boiler 3, and the cooling of mixed flue gas is accelerated.

Referring to fig. 1, in particular, the dust collector (not shown) further includes an ash bin, the bottom end of the tapered portion 54 is connected to a first pneumatic conveying device 55, the combustion settling tower is connected to a second pneumatic conveying device 21, and the ash bucket of the bag-type dust collector 4 is connected to a third pneumatic conveying device 44. The first pneumatic conveying device 55, the second pneumatic conveying device 21 and the third pneumatic conveying device 44 are all communicated with the ash storehouse, so that sundries (the main components of which are furnace ash) collected in the electric furnace flue gas treatment process are treated in a centralized mode, activated carbon powder is not used for adsorbing dioxin in the embodiment, the dioxin content in the collected sundries is low, and the furnace ash can be used as common ash to be applied to the building industry.

Referring to fig. 1, in the present embodiment, the mixed gas is continuously pumped to the chimney 7 by the fan 71 and discharged.

The working principle is as follows:

when the electric furnace is in operation, the smoke flowing out of the cylinder cover has three shares, namely the first smoke in the first pipeline 111, the second smoke in the second pipeline 12 and the third smoke in the third pipeline 13. Preheating the scrap steel by the first flue gas; the second flue gas flows through the heating part to heat the dioxin catalytic decomposition device, and in the process, the temperatures of the first flue gas and the second flue gas are both reduced. And then the first flue gas, the second flue gas and the third flue gas are converged into the combustion settling cylinder 2 together and mixed to form mixed flue gas, and the mixed flue gas is combusted in the combustion settling cylinder 2, so that dioxin in the mixed flue gas is removed. And then the mixed flue gas flows to a quenching tower to be subjected to quenching treatment, then enters a bag-type dust collector 4, and impurities in the mixed flue gas are filtered by the bag-type dust collector 4. And finally, the mixed flue gas enters the dioxin catalytic decomposition device, exchanges heat with the second flue gas to be heated, the dioxin is decomposed and treated by the dioxin catalytic decomposition device, and then the mixed flue gas flows out from an air outlet of the dioxin catalytic decomposition device, so that the mixed flue gas can be directly discharged.

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 variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. The utility model provides an electric stove flue gas ultra-clean processing system, includes scrap steel preheating device, burning sedimentation cylinder, quench tower and sack cleaner, its characterized in that: still include dioxin catalytic decomposition device, dioxin catalytic decomposition device's air intake with the air outlet intercommunication of sack cleaner, dioxin catalytic decomposition device still has heating portion, the heating portion has first opening and second opening, first opening and bell intercommunication, the second opening with the air intake intercommunication of burning sedimentation section of thick bamboo.

2. The ultra-clean treatment system for the flue gas of the electric furnace according to claim 1, characterized in that: the combustion settling cylinder is communicated with the furnace cover.

3. The ultra-clean treatment system for the flue gas of the electric furnace according to claim 2, characterized in that: in the flowing direction of the flue gas of the electric furnace, a first regulating valve is arranged between the scrap steel preheating device and the combustion settling cylinder, a second regulating valve is arranged between the furnace cover and the first opening, and a third regulating valve is arranged between the scrap steel preheating device and the combustion settling cylinder.

4. The ultra-clean treatment system for the flue gas of the electric furnace according to claim 3, characterized in that: still include first temperature sensor, second temperature sensor and controller, wherein:

the first temperature sensor is used for measuring the temperature of the flue gas flowing into the bag-type dust collector;

the second temperature sensor is used for measuring the temperature of the flue gas flowing out of the air outlet of the dioxin catalytic decomposition device;

and the controller is externally connected with an alarm device, controls the operation of the alarm device according to the temperature of the flue gas flowing into the bag-type dust collector, and controls the operation of the second regulating valve according to the temperature of the flue gas flowing out of the air outlet of the dioxin catalytic decomposition device.

5. The ultra-clean treatment system for the flue gas of the electric furnace according to claim 4, characterized in that: a pressure difference detection device is arranged between an air inlet and an air outlet of the bag-type dust collector and used for measuring pressure difference data before and after smoke flows through the bag-type dust collector, and the controller controls the alarm device to operate according to the pressure difference data.

6. The ultra-clean treatment system for the flue gas of the electric furnace according to claim 1, characterized in that: the combustion settling cylinder is internally provided with a first cavity and a second cavity which are communicated with each other, an air inlet and an air outlet of the combustion settling cylinder are respectively arranged on the top walls of the first cavity and the second cavity, and the air inlet of the combustion settling cylinder is higher than the air outlet of the combustion settling cylinder.

7. The ultra-clean treatment system for the flue gas of the electric furnace according to claim 1, characterized in that: the quenching tower comprises a plurality of quenching waste heat boilers which are connected in parallel.

8. The ultra-clean treatment system for the flue gas of the electric furnace according to claim 1, characterized in that: the bottom end of the heating part is communicated with a first pneumatic conveying device, and the combustion settling tower is communicated with a second pneumatic conveying device.

9. The ultra-clean treatment system for the flue gas of the electric furnace according to claim 8, characterized in that: the first opening is arranged at the top end of the heating part, and the second opening is arranged at the bottom end of the side face of the heating part.

10. The ultra-clean treatment system for the flue gas of the electric furnace according to claim 8, characterized in that: and an ash hopper of the bag-type dust collector is communicated with a third pneumatic conveying device, and the first pneumatic conveying device, the second pneumatic conveying device and the third pneumatic conveying device are communicated with an ash storehouse.

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