CN115875998A - Dust removal and waste heat recovery system and method for electric furnace - Google Patents
Dust removal and waste heat recovery system and method for electric furnace Download PDFInfo
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- CN115875998A CN115875998A CN202211712538.6A CN202211712538A CN115875998A CN 115875998 A CN115875998 A CN 115875998A CN 202211712538 A CN202211712538 A CN 202211712538A CN 115875998 A CN115875998 A CN 115875998A
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- 239000002918 waste heat Substances 0.000 title claims abstract description 36
- 238000011084 recovery Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000779 smoke Substances 0.000 claims abstract description 76
- 238000002156 mixing Methods 0.000 claims abstract description 35
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- 238000001914 filtration Methods 0.000 claims abstract description 13
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- 239000002994 raw material Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 230000003584 silencer Effects 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims 6
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 15
- 239000003546 flue gas Substances 0.000 abstract description 15
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- 230000002349 favourable effect Effects 0.000 abstract 1
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- 238000009628 steelmaking Methods 0.000 description 5
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- 238000004064 recycling Methods 0.000 description 3
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- 238000010521 absorption reaction Methods 0.000 description 2
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- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical group O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
Abstract
The invention relates to a dust removal and waste heat recovery system and method for an electric furnace, wherein the system comprises the electric furnace, the electric furnace is provided with a preheating component, the tail end of the preheating component is connected with the inlet end of a first fan through a cooling component, and the first fan is connected with an air mixing cylinder through a first pipeline; the smoke dust generating part of the electric furnace is also provided with a first cover body assembly, the first cover body assembly is connected with a second inlet end of the air mixing cylinder through a second pipeline, the upper part of the first cover body assembly is also provided with a second cover body assembly, the second cover body assembly is connected with a third inlet end of the air mixing cylinder through a third pipeline, an outlet end of the air mixing cylinder is connected with an inlet end of the bag type dust collector through a filtering mechanism, and a power input end of the bag type dust collector is connected with an output end of the power assembly. Through setting up first cover body subassembly, second cover body subassembly its collection that can realize smoke and dust in the different work condition, the smoke and dust collection mode is multiple, can not cause the waste of heat energy, is favorable to high temperature flue gas thermal recycle.
Description
Technical Field
The invention relates to the technical field of waste heat recovery, in particular to a dust removal and waste heat recovery system and method for an electric furnace.
Background
At present, the steel industry is a household with great environmental pollution and energy consumption, and flue gas dust removal and waste heat recovery are one of the strategies for protecting the environment and saving energy in the steel industry. The electric furnace generates a large amount of high-temperature flue gas containing dust and CO in the production process, the average amount of the flue gas generated per ton of steel is 18-20kg, the heat carried away with the flue gas is about 150M, and the energy is seriously wasted and the environment is polluted. With the rapid and comprehensive development of the electric furnace technology, the flue gas waste heat recycling and dust removing technology is also developed. The total energy consumption of the Chinese steel industry accounts for 12-15% of the total energy consumption of the whole country, wherein the electric furnace steel making accounts for 10% of the steel output of the whole country. A large amount of high-temperature dust-containing flue gas (about 1000-1400 ℃) is generated in the electric furnace steelmaking process, and the sensible heat of the flue gas accounts for more than 10% of the total energy consumption of the electric furnace steelmaking.
At present, the domestic smoke is mainly cooled and dedusted, and the primary smoke generated by smelting is pumped out, cooled by a water-cooled elbow, a water-cooled sliding sleeve, a combustion settling chamber and a water-cooled flue, then cooled to about 350 ℃ by an air cooler or a spray cooling tower, and finally mixed with secondary waste gas from a large closed hood and a roof dedusting hood, wherein the temperature of the mixed waste gas is lower than 130 ℃, purified by a deduster, and discharged to the atmosphere by a fan. This mode has realized the purpose of flue gas cooling dust removal, and above-mentioned mode has the problem as follows:
the flue gas is cooled, so that heat energy is wasted, and the heat of the high-temperature flue gas is not recycled.
And on the other hand, the waste of energy is more serious in the process of cooling the flue gas.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, it is an object of the present invention to provide a dust removal and waste heat recovery system and method for an electric furnace, which solves one or more of the problems of the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a dust removal and waste heat recovery system for an electric furnace comprises the electric furnace, wherein a preheating component is arranged at an inlet section of the electric furnace, the tail end of the preheating component is connected with the inlet end of a first fan through a cooling component, and the outlet end of the first fan is connected with the first inlet end of a mixing drum through a first pipeline; the smoke dust generating part of the electric furnace is further provided with a first cover body assembly, the first cover body assembly is connected with a second inlet end of the air mixing barrel through a second pipeline, the upper part of the first cover body assembly is further provided with a second cover body assembly, the second cover body assembly is connected with a third inlet end of the air mixing barrel through a third pipeline, an outlet end of the air mixing barrel is connected with an inlet end of the bag type dust remover through a filtering mechanism, an air valve is further arranged at the connecting part of the filtering mechanism and the belt type dust remover, and a power input end of the bag type dust remover is connected with an output end of the power assembly.
Furthermore, the first cover body assembly comprises a fixed cover and a closed cover, the closed cover is movably arranged on the track beam, the fixed cover is fixedly connected with the track beam, the top of the closed cover is also provided with a plurality of dust collecting pipes, and the dust collecting pipes are symmetrically arranged by taking the smoke generation position as the center.
Furthermore, the fixed cover is also provided with a plurality of cover plates, and each cover plate is detachably arranged on the fixed cover.
Furthermore, the second cover body assembly comprises an outer cover body and an inner cover body connected to the inner part of the outer cover body, and the inner cover body is provided with a first hole for guiding the smoke entering the outer cover body into the inner cover body through the first hole.
Furthermore, the outer cover body comprises a first outer cover part, a second outer cover part and a third outer cover part which are connected with each other, and a first bell mouth is formed at the bottom of the third outer cover part.
Further, the inner cover body comprises a first inner cover portion, a second inner cover portion and a third inner cover portion, a second bell mouth is formed in the bottom of the third inner cover portion, and an inclined plane is formed in the first inner cover portion.
Furthermore, the cooling assembly comprises a vaporization elbow, a vaporization settling chamber and a quenching waste heat boiler, wherein the inlet end of the vaporization elbow is connected with the tail end of the preheating assembly, the outlet end of the vaporization elbow is connected with the inlet end of the vaporization settling chamber, the outlet end of the vaporization settling chamber is connected with the inlet end of the quenching waste heat boiler through a pipeline, and the outlet end of the quenching waste heat boiler is connected with the first fan through a pipeline.
Furthermore, the power assembly comprises a second fan, a first input end of the second fan is connected with the main motor through an airbag clutch, a second input end of the second fan is connected with the steam turbine set through an overrunning clutch, and an air outlet of the second fan is connected with the exhaust funnel through a silencer.
Correspondingly, the invention also provides a method for the dust removal and waste heat recovery system for the electric furnace, which comprises the following steps:
opening the first cover body assembly, pouring the liquid medium into the electric furnace, and simultaneously feeding preheated solid raw materials through the preheating assembly;
the smoke dust flowing out of the preheating assembly is cooled and then is sent into the air mixing barrel through a first pipeline;
the smoke and dust produced by the electric furnace are sucked out through the second cover body component and are sent into the air mixing barrel through a third pipeline; if the liquid medium is not required to be added, closing the first cover body assembly and sending the smoke dust produced by the electric furnace into the air mixing cylinder through a second pipeline;
mixing the smoke and dust which are merged into the air mixing barrel, and cooling to 100-120 ℃;
the mixed smoke dust is filtered by a filtering mechanism, so that the granularity in the smoke dust is reduced to 30-50 mg/m 3 (ii) a The filtered smoke dust is sent into a bag type dust collector through a pipeline, so that the granularity of the smoke dust is purified to be not more than 10mg/m 3 。
Furthermore, if the liquid medium is not required to be added, the first cover body assembly is closed, and the smoke and dust produced by the electric furnace are sent into the mixing air cylinder through the second pipeline.
Compared with the prior art, the invention has the following beneficial technical effects
The first cover body component and the second cover body component are arranged, so that the collection of smoke dust in different working conditions can be realized, when a fluid medium is initially added for steel making, the second cover body component is combined with the cooling component to realize the collection of smoke dust in different paths due to the opening of the first cover body component, when the steel making tends to be stable, the collection of smoke dust in different paths can be realized only by combining the first cover body component with the cooling component, the smoke dust collection modes are various, the waste of heat energy is avoided, and the recycling of high-temperature smoke heat is facilitated.
Further, the setting of cooling subassembly makes can be with steam energy recycle to turboset at flue gas cooling in-process, and it helps realizing providing the electric energy to the fan, has realized the recycle again of the energy, and is energy-conserving effectual.
The dust collecting opening of the closed cover in the first cover body assembly is arranged in a centrosymmetric mode by taking a smoke dust generating point as a center, so that the absorption efficiency of the smoke dust can be effectively improved, the caliber of the dust collecting opening does not need to be too large, the size is reduced, and smoke gas gathering is not easy to form.
Furthermore, the second cover body component can guide smoke dust by arranging a plurality of horn mouths, so that the smoke dust is better collected.
Drawings
Fig. 1 shows a schematic structural diagram of a dust removal and waste heat recovery system for an electric furnace according to an embodiment of the present invention.
Fig. 2 is a front view illustrating a first cover assembly in a dust removal and waste heat recovery system and method for an electric furnace according to an embodiment of the present invention.
Fig. 3 is a top view of a first cover assembly in a dust removal and waste heat recovery system and method for an electric furnace according to an embodiment of the invention.
Fig. 4 is a front view illustrating a second cover assembly in a dust removal and waste heat recovery system and method for an electric furnace according to an embodiment of the present invention.
Fig. 5 is a side view illustrating a second cover assembly in a dust removal and waste heat recovery system and method for an electric furnace according to an embodiment of the invention.
In the drawings, the reference numbers: 1. a first cover assembly; 100. a hermetic enclosure; 101. a fixed cover; 102. a dust collecting pipe; 103. a track beam; 104. a support leg; 105. labyrinth sealing; 106. a cover plate; 2. a second cover assembly; 200. a housing first portion; 201. a ring beam; 202. a housing second portion; 203. a housing third portion; 204. an inner cover first portion; 2040. a bevel; 205. an inner cover second portion; 206. a third portion of the inner cover; 207. a first hole; 300. a first valve; 301. a second valve; 400. a first pipeline; 401. a second pipeline; 402. a third pipeline; 5. an electric furnace body; 6. a pre-heating assembly; 7. vaporizing the bent pipe; 8. a vaporization settling chamber; 9. a quenching exhaust-heat boiler; 10. a first fan; 11. a mixing air duct; 12. a filtering mechanism; 13. an air valve; 14. unloading the ash cylinder; 15. a bag type dust collector; 16. a PLC; 17. a gas storage tank; 18. an exhaust funnel; 19. a second fan; 1900. a muffler; 20. an overrunning clutch; 21. a steam turbine unit; 22. an air bag clutch; 23. a main motor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following will explain in detail a dust removal and waste heat recovery system and method for an electric furnace according to the present invention with reference to the accompanying drawings and the detailed description. 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 all drawn to a non-precise scale for the purpose of convenience and clarity only to aid in the description of the embodiments of the invention. To make the objects, features and advantages of the present invention more comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
The first embodiment is as follows:
referring to fig. 1, the dust removing and waste heat recycling system for an electric furnace of the present embodiment includes an electric furnace 5, an inlet section of the electric furnace 5 has a preheating assembly 6, and the preheating assembly 6 includes a conveying mechanism and a heating mechanism, and is configured to input solid raw materials (such as scrap steel) into the electric furnace 5, and simultaneously heat the solid raw materials to a specified temperature through the heating mechanism.
Further, with reference to fig. 1, the tail end of the preheating assembly 6 is connected to the inlet end of the first fan 10 through a cooling assembly, and the outlet end of the first fan 10 is connected to the first inlet end of the mixing drum 11 through a first pipeline 400.
Specifically, the cooling subassembly is used for cooling down the flue gas that flows out electric stove 5 many times, the cooling subassembly includes that the cooling subassembly includes vaporization return bend 7, vaporization settling chamber 8 and rapid cooling exhaust-heat boiler 9, and the entrance point of vaporization return bend 7 and the end connection who preheats subassembly 6, and the entrance point of vaporization settling chamber 8 is connected to the exit end of vaporization return bend 7, and the exit end of vaporization settling chamber 8 passes through the entrance point connection of pipeline and rapid cooling exhaust-heat boiler 9, and the exit end of rapid cooling exhaust-heat boiler 9 passes through first fan 10 of tube coupling. The vaporization elbow 7 is used for collecting smoke dust at the adding position of the solid raw material, the temperature of the smoke dust at the adding position is up to 1000-1200 ℃, the high-temperature smoke dust is subjected to heat exchange by using a cooling medium through the vaporization elbow 7 and is converted into steam, further, waste heat recovery is realized, the steam is collected through an external pipeline and is converged into a steam turbine unit 21, and the temperature of the smoke dust passing through the vaporization elbow 7 is reduced to 500-600 ℃. With reference to fig. 1, the steam at the outlet end of the vaporization elbow 7 enters the vaporization settling chamber 8, and large particles are settled in the vaporization settling chamber 8 to reduce the ash deposition in the later pipeline, and at the same time, the vaporization settling chamber 8 also utilizes the high temperature in the smoke and converts the high temperature into steam through a cooling medium (such as water), and the steam is also collected and merged into the turbine unit 21 through an external pipeline, and the smoke and dust passing through the vaporization settling chamber 8 is cooled to 400-500 ℃ for the second time. Referring to fig. 1, the smoke after the secondary cooling is heat exchanged by the rapid cooling exhaust-heat boiler 9, so that the smoke is cooled again to a temperature not greater than 220 ℃ in a short time (1-1.2 s), the rapid cooling exhaust-heat boiler 9 in this embodiment adopts a horizontal structure of a light pipe evaporator, the designed temperature of the horizontal structure is not greater than 600-650 ℃, that is, the temperature entering the rapid cooling exhaust-heat boiler 9 cannot exceed the above temperature, and the horizontal structure can effectively inhibit the decomposition of dioxin in the smoke, and simultaneously convert the high temperature into steam by using a cooling medium, so as to realize that the steam is collected by an external pipeline and is merged into the steam turbine unit 21. The first fan 10 is used for increasing the pressure of the smoke dust flowing out of the quenching exhaust-heat boiler 9, so that the smoke dust can enter the air mixing barrel 11 through the first pipeline 400 after being increased in pressure.
Further, a first hood assembly 1 is further disposed at the smoke generating position of the electric furnace 5, and the first hood assembly 1 is connected with a second inlet end of the air mixing cylinder 11 through a second pipeline 401.
Specifically, referring to fig. 2 and 3, the first cover assembly includes a fixed cover 101 and a sealing cover 100, the sealing cover 100 is movably disposed on a track beam 103, a plurality of legs 104 are connected to a bottom of the track beam 103, and a labyrinth seal 105 is disposed between the sealing cover 100 and the fixed cover 101 for ensuring the sealing performance between the sealing cover 100 and the fixed cover 101. Specifically, the bottom of the enclosure 100 has wheel sets, and each wheel set is connected to an output end of a power unit (e.g., a motor), so as to rotate the wheel set. Fixed cover 101 and track roof beam 103 rigid coupling still have a plurality of dust collecting tubes 102 at the top of sealed cover 100, and dust collecting tube 102 uses the smoke and dust to take place the department and set up as central symmetry, and the absorption efficiency that can promote the smoke and dust in traditional structure is compared to the dust collecting tube 102 that the symmetry was seted up, sets up a plurality of dust collecting tubes 102 simultaneously and compares the mouth of pipe bore that can further reduce dust collecting tube 102 with traditional structure, makes the circulation of smoke and dust along the department of seting up of dust collecting tube 102, is difficult for forming the smoke and dust gathering.
With continued reference to fig. 2 and fig. 3, in order to ensure that the inside of the fixed cover 101 can be inspected, the fixed cover 101 further has a plurality of cover plates 106, each cover plate 106 is detachably disposed on the fixed cover 101, the cover plate 106 is further provided with a lifting lug 1060, and the cover plate 106 can be lifted away by a crane through the lifting lug 1060, so as to separate the cover plate 106 from the fixed cover 101.
Further, referring to fig. 1, fig. 4 and fig. 5, a second cover assembly 2 is further disposed on the upper portion of the first cover assembly 1, and the second cover assembly 2 is connected to the third inlet end of the mixing duct 11 through a third pipeline 402.
Specifically, with continued reference to fig. 1, 4 and 5, the second cover assembly 2 includes an outer cover and an inner cover connected to the inside of the outer cover, the inner cover having a first hole 207 for guiding the flue gas entering the outer cover into the inner cover through the first hole 207.
With reference to fig. 1, fig. 4 and fig. 5, the outer cover body includes a first outer cover portion 200, a second outer cover portion 202 and a third outer cover portion 203, which are connected to each other, a ring beam 201 is disposed outside the second outer cover portion 202, and a first bell mouth is disposed at the bottom of the third outer cover portion 203. The inner cover body comprises an inner cover first portion 204, an inner cover second portion 205 and an inner cover third portion 206, a second bell mouth is arranged at the bottom of the inner cover third portion 206, and a slope 2040 is arranged on the inner cover first portion 204. Can realize the direction to the smoke and dust through setting up first horn mouth and second horn mouth, simultaneously the setting of the interior cover body can be better the remittance smoke and dust to with the tradition design than further dwindling the cover body area that the smoke and dust got into the part, effectively the cost is reduced.
Referring to fig. 1, an outlet end of the air mixing cylinder 11 is connected to an inlet end of a bag type dust collector 15 through a filtering mechanism 12, an air valve 13 is further disposed at a joint of the filtering mechanism 12 and the bag type dust collector 15, and a power input end of the bag type dust collector 15 is connected to an output end of a power assembly.
Specifically, referring to fig. 1, the power assembly includes a second fan 19, a first input end of the second fan 19 is connected to a main motor 23 through an airbag clutch 22, a second input end of the second fan 19 is connected to a turbine unit 21 through an overrunning clutch 20, and an air outlet of the second fan 19 is connected to the exhaust cylinder 18 through a silencer.
Correspondingly, the invention also provides a method for the dust removal and waste heat recovery system for the electric furnace, which is characterized by comprising the following steps of:
the first step is as follows: the first hood body assembly 1 is opened, specifically, the wheel set is driven by the power part, so that the closed hood 100 is separated relative to the fixed hood 101, the closed hood 100 moves on the track beam 103 in the direction away from the fixed hood 101, a liquid medium such as molten iron is poured into the electric furnace 5 through an external pipeline, and simultaneously preheated solid raw materials, which are scrap steel in this embodiment, are fed through the preheating assembly.
The second step: the smoke dust flowing out of the preheating assembly is firstly cooled to 500-600 ℃ through a vaporization elbow pipe and then enters a vaporization settling chamber 8, the vaporization settling chamber 8 is used for cooling the smoke dust to 400-500 ℃ for the second time, the smoke dust after the second temperature reduction is cooled to not more than 220 ℃ through a quenching waste heat boiler, and then the smoke dust is pressurized through a first fan 10 and sent into a mixing air cylinder 11 through a first pipeline 400.
The third step: since the hermetic cover 100 is separated with respect to the fixed cover 101, smoke is generated from the electric furnace body 5, the smoke flows into the outer and inner covers of the second cover body assembly 2, and the smoke flowing into the outer cover enters the inner cover through the first hole 207, and after the first valve 300 is opened, the smoke flows into the third pipe 402 and enters the mixing duct 11.
The fourth step: the smoke and dust entering from the third pipeline 402 and the smoke and dust entering from the first pipeline 400 are fully mixed in the air mixing cylinder 11, and then the temperature is reduced to 100-120 ℃.
The fifth step: the mixed smoke dust is filtered by a filtering mechanism 12, and the granularity in the smoke dust is reduced to 30-50 mg/m by the filtering mechanism 3 。
And a sixth step: the filtered smoke dust is sent into a bag type dust collector 15 through a pipeline for dust collection, so that the granularity in the smoke dust is purified to be not more than 10mg/m 3 . The gas exiting the bag house 15 enters the gas storage pipe 17 and is treated. The ash is discharged to the ash discharging barrel 14 through a pipeline for centralized discharge treatment.
Further, when the temperature of the smoke entering the inlet end of the bag type dust collector 15 is not less than 120 ℃, the air valve 13 is opened, the air valve enables outside air to flow in, and the temperature of the smoke is reduced to be not more than 110 ℃.
Furthermore, the outlet of each cloth bag in the bag type dust collector 15 is also connected with the PLC16 through a pressure gauge, the pressure at the inlet end of the bag type dust collector can be detected through the pressure gauge, meanwhile, the pressure gauge is also arranged at the inlet of the bag type dust collector 15, so that the pressure difference between the air inlet and the air outlet of the bag type dust collector can be calculated, and when the pressure difference value is exceeded, the fact that the bag type dust collector needs to perform dust cleaning is indicated.
In this embodiment, the power of the bag-type dust collector 15 is derived from the second fan 19, and because the steam in the early stage is insufficient, the compressed air enters the air bag of the air bag clutch 22 after the power is switched on through the main motor 23, the air pressure inside the air bag clutch 22 is gradually increased, the power is stably transmitted to the main fan 19, and the operation of the main fan 19 is further realized.
In other embodiments, the steam recovered by the vaporization elbow 7, the vaporization settling chamber 8 and the quenching exhaust-heat boiler 9 enters the steam turbine set 21 to drive the steam turbine set 21 to operate, the steam turbine set 21 outputs kinetic energy and enables the overrunning clutch to reach the rotation torque, and then the second fan 19 is driven to operate, and at the moment, the main motor 23 does not output electric energy but can rotate along with the rotation.
When the output energy consumption generated by the steam turbine set 21 is greater than the energy consumption required by the second fan 19, the electric energy can be reversely output through the main motor 23 to achieve the purpose of energy saving, and the reverse output of the electric energy by the main motor 23 is the prior art, and further description is omitted in the present invention.
Finally, after the contrast at the outlet end of the second fan 19 is eliminated through the silencer 1900, the gas is sent to the exhaust funnel 18, so that the external gas reaches the standard and is discharged into the atmosphere.
The second embodiment:
the second embodiment has the same structure as the first embodiment, except that the first step is omitted in the method, referring to fig. 1, when no liquid medium is required to be added, the sealing cover 100 in the first cover body assembly 1 is connected with the fixed cover 101 through labyrinth seal, the second valve 301 is opened, the smoke generated by the electric furnace body 5 flows out through the dust collecting pipe 102 of the sealing cover 100 and is sent into the air mixing duct 11 through the second pipeline 401, and then is mixed with the smoke sent into the air mixing duct 11 through the first pipeline 400 after being cooled by the cooling assembly to be cooled, and is sent into the bag type dust collector 15 through the filtering mechanism 12 again to be dedusted.
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 express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. The utility model provides an electric stove is with removing dust and waste heat recovery system, includes the electric stove, the entrance of electric stove has preheating component, its characterized in that: the tail end of the preheating assembly is connected with the inlet end of a first fan through a cooling assembly, and the outlet end of the first fan is connected with the first inlet end of the mixing drum through a first pipeline; the smoke dust generation part of the electric furnace is further provided with a first cover body assembly, the first cover body assembly is connected with a second inlet end of the air mixing cylinder through a second pipeline, the upper part of the first cover body assembly is further provided with a second cover body assembly, the second cover body assembly is connected with a third inlet end of the air mixing cylinder through a third pipeline, an outlet end of the air mixing cylinder is connected with an inlet end of the bag type dust collector through a filtering mechanism, an air valve is further arranged at the joint of the filtering mechanism and the belt type dust collector, and a power input end of the bag type dust collector is connected with an output end of the power assembly.
2. The dust removal and waste heat recovery system for an electric furnace according to claim 1, wherein: the first cover body assembly comprises a fixed cover and a closed cover, the closed cover is movably arranged on the track beam, the fixed cover is fixedly connected with the track beam, the top of the closed cover is further provided with a plurality of dust collecting pipes, and the dust collecting pipes are symmetrically arranged by taking a smoke generation position as a center.
3. The dust removal and waste heat recovery system for an electric furnace according to claim 2, wherein: the fixed cover is also provided with a plurality of cover plates, and each cover plate is detachably arranged on the fixed cover.
4. The dust removal and waste heat recovery system for the electric furnace according to claim 1, wherein: the second cover body assembly comprises an outer cover body and an inner cover body connected to the inside of the outer cover body, and the inner cover body is provided with a first hole for guiding smoke entering the outer cover body into the inner cover body through the first hole.
5. The dust removal and waste heat recovery system for an electric furnace according to claim 4, wherein: the outer cover body comprises a first outer cover part, a second outer cover part and a third outer cover part which are connected with each other, and a first bell mouth is formed at the bottom of the third outer cover part.
6. The dust removal and waste heat recovery system for an electric furnace according to claim 5, wherein: the inner cover body comprises a first inner cover part, a second inner cover part and a third inner cover part, a second bell mouth is arranged at the bottom of the third inner cover part, and an inclined plane is arranged on the first inner cover part.
7. The dust removal and waste heat recovery system for the electric furnace according to claim 1, wherein: the cooling assembly comprises an evaporation elbow, an evaporation settling chamber and a quenching waste heat boiler, the inlet end of the evaporation elbow is connected with the tail end of the preheating assembly, the outlet end of the evaporation elbow is connected with the inlet end of the evaporation settling chamber, the outlet end of the evaporation settling chamber is connected with the inlet end of the quenching waste heat boiler through a pipeline, and the outlet end of the quenching waste heat boiler is connected with a first fan through a pipeline.
8. The dust removal and waste heat recovery system for an electric furnace according to claim 1, wherein: the power assembly comprises a second fan, a first input end of the second fan is connected with the main motor through an airbag clutch, a second input end of the second fan is connected with the steam turbine set through an overrunning clutch, and an air outlet of the second fan is connected with the exhaust funnel through a silencer.
9. The method of the dust removal and waste heat recovery system for the electric furnace according to any one of claims 1 to 9, characterized by comprising the steps of:
opening the first cover body assembly, pouring the liquid medium into the electric furnace, and simultaneously feeding the preheated solid raw material through the preheating assembly;
the smoke dust flowing out of the preheating component is cooled and then is sent into the air mixing barrel through a first pipeline;
the smoke and dust produced by the electric furnace are sucked out through the second cover body component and are sent into the air mixing barrel through a third pipeline; if the liquid medium is not required to be added, closing the first cover body assembly and sending the smoke dust produced by the electric furnace into the air mixing barrel through a second pipeline;
mixing the smoke and dust which are merged into the air mixing barrel, and cooling to 100-120 ℃;
the mixed smoke dust is filtered by a filtering mechanism, so that the granularity in the smoke dust is reduced to 30-50 mg/m 3 (ii) a The filtered smoke dust is sent into a bag type dust collector through a pipeline, so that the granularity of the smoke dust is purified to be not more than 10mg/m 3 。
10. The method of the dust removal and waste heat recovery system for the electric furnace according to claim 9, wherein: and if the liquid medium is not required to be added, closing the first cover body assembly and sending the smoke and dust produced by the electric furnace into the air mixing barrel through the second pipeline.
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| CN202211712538.6A CN115875998A (en) | 2022-12-29 | 2022-12-29 | Dust removal and waste heat recovery system and method for electric furnace |
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| CN202211712538.6A CN115875998A (en) | 2022-12-29 | 2022-12-29 | Dust removal and waste heat recovery system and method for electric furnace |
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| CN201301577Y (en) * | 2008-11-18 | 2009-09-02 | 无锡红旗除尘设备有限公司 | Electric furnace roof smoke collecting cover |
| CN201672810U (en) * | 2010-04-08 | 2010-12-15 | 中冶赛迪工程技术股份有限公司 | Scrap steel preheating conveying device |
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| CN105043113A (en) * | 2015-03-10 | 2015-11-11 | 中能世华(北京)节能科技有限公司 | Thermal system waste heat utilization intelligent device |
| CN210463961U (en) * | 2019-02-12 | 2020-05-05 | 唐钢国际工程技术股份有限公司 | Semi-closed dust excluding hood special for Consedi electric arc furnace |
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| CN201301577Y (en) * | 2008-11-18 | 2009-09-02 | 无锡红旗除尘设备有限公司 | Electric furnace roof smoke collecting cover |
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