CN104359326A - System for efficiently recovering steel-making flue gas residual heat of electric-arc furnace - Google Patents
System for efficiently recovering steel-making flue gas residual heat of electric-arc furnace Download PDFInfo
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- CN104359326A CN104359326A CN201410685235.9A CN201410685235A CN104359326A CN 104359326 A CN104359326 A CN 104359326A CN 201410685235 A CN201410685235 A CN 201410685235A CN 104359326 A CN104359326 A CN 104359326A
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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
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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
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
The invention discloses a system for efficiently recovering steel-making flue gas residual heat of an electric-arc furnace. The system comprises a movable flue, a fixed flue, a settling chamber, a residual heat boiler high-temperature flue, a residual heat boiler and a heat accumulator, wherein the movable flue and the fixed flue are provided with inner heat-insulating devices; the residual heat boiler is provided with a gasifying water cooling radiation heat exchange chamber, a convection heat exchange chamber and the like; flue gas exhausted from the four holes of the electric-arc furnace flows through the movable flue, the fixed flue and the settling chamber, and enters the residual heat boiler after flowing through the settling chamber and the residual heat boiler high-temperature flue; after high-temperature flue gas exchanges heat with a film type water cooling wall, a radiation water cooling screen, an evaporator and a coal economizer in the residual heat boiler, the temperature of the flue gas is lowered greatly; then the flue gas is exhausted from a boiler system after dust removal; the residual heat boiler absorbs heat to produce steam, and the steam is turned into continuous steam after being subjected to pressure stabilization through the heat accumulator for use in production or power generation. By adopting the system, the flue gas heat of the electric-arc furnace can be fully recovered, and over 70 percent of the heat of the flue gas exhausted by the electric-arc furnace can be reached.
Description
Technical field
The present invention relates to a kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming, specifically can reclaim efficiently electric arc furnaces discharge the heat of high-temperature flue gas, reduce exhaust gas temperature to greatest extent, ensure cleaner safe operation, reduce dedusting power consumption, belong to the energy-conserving and environment-protective technical field that electric arc furnaces is produced.
Background technology
At present, in electric-arc furnace steelmaking production process, the temperature of the high-temperature flue gas of discharging is very high, generally at 1300 DEG C ~ 1600 DEG C, just can carry out dedusting after must first cooling.At present, electric furnace flue gas heat recovery mode is: movable water-cooling flue---fixing water-cooled flue---water-cooling sedimentation room---fixing water-cooled flue---heat pipe waste heat boiler.All there is shortcomings in above-mentioned way of recycling: 1, the water-band of movable water-cooling flue, fixing water-cooled flue and water-cooling sedimentation room has walked a large amount of heats; 2, heat pipe waste heat boiler only can bear 850 DEG C of flue-gas temperatures, therefore when flue-gas temperature is higher than 850 DEG C, need infiltrate cold wind in order to control cigarette temperature, cause the increase of exhaust smoke level like this, add flue gas loss.The heat pipe life-span of heat pipe waste heat boiler is shorter in addition.Current electric furnace flue gas waste heat recovery efficiency is lower than 50%.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, provides a kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming, can heat energy efficiently in recovered flue gas, and electric furnace flue gas waste heat recovery efficiency reaches more than 70%.And the safe operation requirement of dust pelletizing system can be met, improve efficiency of dust collection, improve the energy saving standard level of electric arc furnaces production technology.
Technical scheme: a kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming of the present invention, comprise the movable flue of electric arc furnaces, flue fixed by electric arc furnaces, expansion chamber, boiler high temperature flue, waste heat boiler, storage heater, oxygen-eliminating device, establish inner thermal insulation device inside described electric arc furnaces movable flue and fixing flue; Described waste heat boiler is water-tube boiler, if drum, water-cooled radiation heat transfer room, convection heat-exchange chamber; One end of described electric arc furnaces movable flue is connected with arc furnace cover four hole flue, and the other end is connected with one end of fixing flue, and fixing flue is connected with expansion chamber, establishes boiler high temperature flue between expansion chamber and waste heat boiler; One end of described waste heat boiler water-cooled radiation heat transfer room and boiler high temperature flue, the other end of water-cooled radiation heat transfer room is connected with convection heat-exchange chamber front end; The rear end of convection heat-exchange chamber is connected with the exit flue of waste heat boiler; The drum of described waste heat boiler is established outer for jet chimney, and jet chimney establishes storage heater to outer confession.
A kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming of the present invention, preferred embodiment is establish heat-insulation layer and wearing layer inside movable flue and fixing flue.
A kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming of the present invention, preferred embodiment is the heat-insulation layer material of movable flue and fixing flue is insulated pouring material, and the wearing layer material of described movable flue and fixing flue is corundum castable.
A kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming of the present invention, preferred embodiment is that radiation water-cooling screen and fin panel casing are established in water-cooled radiation heat transfer indoor.
A kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming of the present invention, preferred embodiment is that radiation water-cooling screen becomes screen formula by row's steel pipe each other by Plate Welding, described radiation water-cooling screen hangs and is installed in water-cooled radiation chamber, the upper end of described radiation water-cooling screen is connected with drum by pipeline, header, and the lower end of described radiation water-cooling screen is connected with drum by pipeline, header.
A kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming of the present invention, preferred embodiment is that radiation water-cooling screen is made up of the parallel steel pipe of a row, described radiation water-cooling screen hangs and is installed in water-cooled radiation chamber, the upper end of described radiation water-cooling screen is connected with drum by pipeline, header, and the lower end of described radiation water-cooling screen is connected with drum by pipeline, header.
A kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming of the present invention, preferred embodiment is that convection heat-exchange chamber establishes evaporimeter, high-temperature economizer and low-level (stack-gas) economizer, and described high-temperature economizer outlet is connected with drum by pipeline.Described high-temperature economizer import is connected with oxygen-eliminating device by pipeline, water pump.
A kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming of the present invention, preferred embodiment is that ash exhauster is established in bottom, waste heat boiler water-cooled radiation heat transfer room; Ash exhauster is established in waste heat boiler convection heat-exchange chamber bottom.
A kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming of the present invention, preferred embodiment is expansion chamber is adiabatic expansion chamber; Arch top established by described expansion chamber, and its internal layer adopts corundum material to build by laying bricks or stones; Described boiler high temperature flue is preferably adiabatic flue, and adiabatic flue internal layer is preferably built by laying bricks or stones with high alumina refractories.。
A kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming of the present invention, described expansion chamber is preferably vaporization water-cooled expansion chamber; Expansion chamber water cooled membrane wall is established at the side wall of expansion chamber and top; The water inlet pipe of expansion chamber water cooled membrane wall is connected with expansion chamber forced circulation delivery side of pump by pipeline, and the water manifold that goes out of expansion chamber water cooled membrane wall is connected with drum by pipeline, and the water inlet of expansion chamber forced circulation water pump is connected with drum by pipeline, valve.。
Flue gas flow of the present invention is 1300 ~ 1600 DEG C of high-temperature flue gas that electric arc furnaces is produced in process of production, fix flue by movable flue and electric arc furnaces and enter expansion chamber, the bulky grain dust in flue gas is removed in expansion chamber, then high-temperature flue gas enters the water-cooled radiation heat transfer room of waste heat boiler by boiler high temperature flue, , after high-temperature flue gas and radiation water-cooling screen and fin panel casing heat exchange, flue-gas temperature will decline to a great extent, usual flue-gas temperature is down to 600 ~ 800 DEG C, the volume of flue gas significantly reduces, flue gas flow rate also significantly reduces, large material dust in flue gas falls into radiation chamber ash bucket, carry out final dusting, then flue gas enters convection heat-exchange chamber, with evaporimeter, high-temperature economizer, after low-level (stack-gas) economizer heat exchange, discharged by boiler exhaust gas flue, after sending deduster dedusting, up to standard emptying, meet environmental requirement.
Steam flow process of the present invention is: after soft water supplementing water or steam turbine condensate water are heated by low-level (stack-gas) economizer, send into oxygen-eliminating device deoxygenation, water after deoxygenation is delivered to after high-temperature economizer heating through feed pump pressurization, send into drum, the water in drum absorbs flue gas heat by radiation water-cooling screen, fin panel casing and evaporimeter, produces steam, steam in drum is connected with storage heater for jet chimney by the outer of drum top, by storage heater, make the outer pressure stability for steam, meet and produce and life use.
The present invention compared with prior art has the following advantages:
The present invention has fully reclaimed the heat of electric arc furnaces high-temperature flue gas, there is the thermal efficiency high, the thermal efficiency reaches more than 70%, be applicable to all flue-gas temperatures, and overcome a waste heat boiler dust blocking difficult problem, not only system is simple, reliable, maintenance cost and operating cost low, and improve electric arc furnaces flue gas ash removal efficiency, reduce dust pelletizing system power consumption.
Accompanying drawing explanation
Fig. 1 is electric-arc furnace steelmaking fume afterheat efficient system for reclaiming schematic diagram (embodiment one) of the present invention.
1, electric arc furnaces 2, bell 3, large petticoat pipe 4, movable flue 5, flue 6 fixed by electric arc furnaces, boiler high temperature flue 7, waste heat boiler 8, drum 9, current-sharing room 10, water-cooled radiation chamber 11, fin panel casing 12, outer for jet chimney 13, storage heater 14, oxygen-eliminating device 15, feed pump 16, low-level (stack-gas) economizer 17, the few coal device 18 of high temperature, evaporimeter 19, convection heat-exchange chamber 20, ash exhauster 21, ash bucket 22, radiation water-cooling screen 23, expansion chamber 24, boiler exhaust gas flue 25, deduster
Fig. 2 is the radiation water-cooling screen schematic diagram (embodiment two) of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming of the present invention.
1, electric arc furnaces 2, bell 3, large petticoat pipe 4, movable flue 5, flue 6 fixed by electric arc furnaces, boiler high temperature flue 7, waste heat boiler 8, drum 9, current-sharing room 10, water-cooled radiation chamber 11, fin panel casing 12, outer for jet chimney 13, storage heater 14, oxygen-eliminating device 15, feed pump 16, low-level (stack-gas) economizer 17, the few coal device 18 of high temperature, evaporimeter 19, convection heat-exchange chamber 20, ash exhauster 21, ash bucket 22, radiation water-cooling screen 23, expansion chamber 24, boiler exhaust gas flue 25, deduster 231, expansion chamber forced circulation pump 232, expansion chamber water cooled membrane wall
Fig. 3 is the radiation water-cooling screen schematic diagram (embodiment one) of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming of the present invention.
22, junction steel plate between radiation water-cooling screen 26, seamless steel pipe 27, steel pipe
Fig. 4 is the radiation water-cooling screen schematic diagram (embodiment two) of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming of the present invention.
22, reinforcement plate 30, pipe clamp between radiation water-cooling screen 28, seamless steel pipe 29, steel pipe
Fig. 5 is that the movable flue of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming of the present invention and the inner side of fixing flue are incubated and wearing layer schematic diagram
31, outer wall 32, heat-insulation layer 33, wearing layer
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described.
Embodiment one:
As shown in Figure 1: the present invention plants electric-arc furnace steelmaking fume afterheat efficient system for reclaiming, comprise the movable flue (4) of electric arc furnaces (1), flue (5) fixed by electric arc furnaces, expansion chamber (23), boiler high temperature flue (6), waste heat boiler (7), storage heater (13), oxygen-eliminating device (14); Install protective layer and the heat-insulation layer of Wear-resistant, high-temperature resistant in the inner side of movable flue (4) and fixing flue (5), protective layer material adopts diamond spar castable, and heat-insulation layer adopts insulated pouring material; Waste heat boiler is band radiation chamber water-tube boiler, if drum (8), water-cooled radiation heat transfer room (10), convection heat-exchange chamber (19); One end of electric arc furnaces movable flue (4) is connected with arc furnace cover four hole flue, and the other end is connected with the one end of fixing flue (5), and fixing flue (5) is connected with expansion chamber (23); Expansion chamber (23) is connected by high-temperature flue (6) one end with waste heat boiler (7) water-cooled radiation heat transfer room (10), and the other end of water-cooled radiation heat transfer room (10) is connected with convection heat-exchange chamber (19) front end; The rear end of convection heat-exchange chamber (19) is connected with the exit flue (24) of waste heat boiler (6); The drum (8) of waste heat boiler (7) is installed outer for jet chimney (12), outer for jet chimney (12) installation storage heater (13), the jet chimney leading to user installed by storage heater (13).
By dress radiation water-cooling screen (22) in water-cooled radiation heat transfer room (10), radiation water-cooling screen (22) becomes screen formula (see Fig. 3) by row's steel pipe each other by Plate Welding, radiation water-cooling screen (22) hangs and is installed in water-cooled radiation chamber, the upper end of radiation water-cooling screen (22) is connected with drum (8) by pipeline, header, the lower end of radiation water-cooling screen (22) is connected with drum (8) by pipeline, header, and radiation water-cooling screen has four pieces.
In convection heat-exchange chamber (19) by dress evaporimeter (18), high-temperature economizer (17) and low-level (stack-gas) economizer (16), high-temperature economizer (17) outlet is connected with drum (8) by pipeline, and high-temperature economizer (17) import is connected with oxygen-eliminating device (14) by pipeline, water pump.
Ash bucket (21) is installed, in ash bucket (21) bottom by dress ash exhauster (20) in the bottom of water-cooled radiation heat transfer room (10) and convection heat-exchange chamber (19).
Electric arc furnaces movable flue (4) and electric arc furnaces are fixed the two kinds of castables in flue (5) inner side and are poured into a mould (see Fig. 5), a kind of insulated pouring material (32), another kind is corundum castable (33), corundum castable be arranged on counter-fire side.
Expansion chamber (23) is adiabatic expansion chamber, adopts arch top, and its internal layer adopts high alumina refractories to build by laying bricks or stones, and intermediate layer is refractory insulating layer, and skin is concrete, installs silicate aluminum board at concrete and refractory insulating layer.
Flue gas process flow process of the present invention is 1300 ~ 1600 DEG C of high-temperature flue gas that electric arc furnaces (1) is produced in process of production, fix flue (5) by movable flue (4) and electric arc furnaces and enter expansion chamber (23), the bulky grain dust in flue gas is removed in expansion chamber (23), high-temperature flue gas after sedimentation dedusting enters the water-cooled radiation chamber (10) of waste heat boiler (7) by boiler high temperature flue (6), after high-temperature flue gas and radiation water-cooling screen (22) and fin panel casing (11) heat exchange, flue-gas temperature declines to a great extent, usual flue-gas temperature is down to 600 ~ 800 DEG C, the volume of flue gas significantly reduces, flue gas flow rate also significantly reduces, bulky grain dust in flue gas falls into ash bucket, after secondary settlement dedusting, flue gas enters convection heat-exchange chamber (19), with evaporimeter (18), high-temperature economizer (17), after low-level (stack-gas) economizer (16) heat exchange, discharged by boiler exhaust gas flue (24), now the temperature of flue gas is less than 150 DEG C, after sending deduster dedusting, up to standard emptying, meet environmental requirement.
Steam flow process of the present invention is: soft water supplementing water or steam turbine condensate water are by after low-level (stack-gas) economizer (16) heating, send into oxygen-eliminating device (14) deoxygenation, water after deoxygenation is delivered to after high-temperature economizer (17) heating through feed pump (15) pressurization, send into drum (8), water in drum absorbs flue gas heat by radiation water-cooling screen (22), fin panel casing (11) and evaporimeter (18), produce steam, the steam in drum (8) sends into storage heater (13) and user by the outer of drum top for jet chimney (12).The production technology of electric arc furnaces is intermittence, when electric arc furnaces (1) stop blowing, when waste heat boiler (7) can not produce steam, now by storage heater (13) to user's steam supply, ensure the outer pressure stability for steam, satisfied production and life use.
Enforcement executes two:
As shown in Figure 2: a kind of electric-arc furnace steelmaking fume afterheat of the present invention efficient system for reclaiming, comprise the movable flue (4) of electric arc furnaces (1), flue (5) fixed by electric arc furnaces, expansion chamber (23), boiler high temperature flue (6), waste heat boiler (7), storage heater (13), oxygen-eliminating device (14); Install protective layer and the heat-insulation layer of Wear-resistant, high-temperature resistant in the inner side of movable flue (4) and fixing flue (5), protective layer material adopts diamond spar castable, and heat-insulation layer adopts insulated pouring material; Waste heat boiler is band radiation chamber water-tube boiler, if drum (8), water-cooled radiation heat transfer room (10), convection heat-exchange chamber (19); One end of electric arc furnaces movable flue (4) is connected with arc furnace cover four hole flue, and the other end is connected with the one end of fixing flue (5), and fixing flue (5) is connected with expansion chamber (23); Expansion chamber (23) is connected by high-temperature flue (6) one end with waste heat boiler (7) water-cooled radiation heat transfer room (10), and the other end of water-cooled radiation heat transfer room (10) is connected with convection heat-exchange chamber (19) front end; The rear end of convection heat-exchange chamber (19) is connected with the exit flue (24) of waste heat boiler (6); The drum (8) of waste heat boiler (7) is installed outer for jet chimney (12), outer for jet chimney (12) installation storage heater (13), the jet chimney leading to user installed by storage heater (13).
By dress radiation water-cooling screen (22) in water-cooled radiation heat transfer room (10), radiation water-cooling screen (22) connects into screen formula (see Fig. 4) by row's steel pipe each other by reinforcement plate (29) and pipe clamp (30), radiation water-cooling screen (22) hangs and is installed in water-cooled radiation chamber, the upper end of radiation water-cooling screen (22) is connected with drum (8) by pipeline, header, the lower end of radiation water-cooling screen (22) is connected with drum (8) by pipeline, header, and radiation water-cooling screen has four pieces.
In convection heat-exchange chamber (19) by dress evaporimeter (18), high-temperature economizer (17) and low-level (stack-gas) economizer (16), high-temperature economizer (17) outlet is connected with drum (8) by pipeline, and high-temperature economizer (17) import is connected with oxygen-eliminating device (14) by pipeline, water pump.
Ash bucket (21) is installed, in ash bucket (21) bottom by dress ash exhauster (20) in the bottom of water-cooled radiation heat transfer room (10) and convection heat-exchange chamber (19).
Electric arc furnaces movable flue (4) and electric arc furnaces are fixed the two kinds of castables in flue (5) inner side and are poured into a mould (see Fig. 5), a kind of insulated pouring material (32), another kind is corundum castable (33), corundum castable be arranged on counter-fire side.
Expansion chamber (23) is vaporization water-cooled expansion chamber, and the side wall of expansion chamber and top are expansion chamber water cooled membrane wall; Protective layer is installed in the bottom of expansion chamber water cooled membrane wall, and protective layer is the cast of high alumina material.The water inlet pipe of expansion chamber water cooled membrane wall (232) is connected by the outlet of pipeline with expansion chamber forced circulation pump (231), the water manifold that goes out of expansion chamber water cooled membrane wall (232) is connected with drum (8) by pipeline, and the water inlet of expansion chamber forced circulation water pump (231) is connected with drum (8) by pipeline, valve.
Flue gas process flow process of the present invention is 1300 ~ 1600 DEG C of high-temperature flue gas that electric arc furnaces (1) is produced in process of production, fix flue (5) by movable flue (4) and electric arc furnaces and enter expansion chamber (23), high-temperature flue gas carries out heat exchange by expansion chamber water cooled membrane wall (232) and the water from drum in expansion chamber, release part heat, flue-gas temperature has certain decline, but flue-gas temperature is still higher, high-temperature flue gas removes the bulky grain dust in flue gas in expansion chamber (23), flue gas after sedimentation dedusting enters the water-cooled radiation chamber (10) of waste heat boiler (7) by boiler high temperature flue (6), after high-temperature flue gas and radiation water-cooling screen (22) and fin panel casing (11) heat exchange, flue-gas temperature declines to a great extent, usual flue-gas temperature is down to 600 ~ 800 DEG C, the volume of flue gas significantly reduces, flue gas flow rate also significantly reduces, bulky grain dust in flue gas falls into ash bucket, after secondary settlement dedusting, flue gas enters convection heat-exchange chamber (19), with evaporimeter (18), high-temperature economizer (17), after low-level (stack-gas) economizer (16) heat exchange, discharged by boiler exhaust gas flue (24), now the temperature of flue gas is less than 150 DEG C, after sending deduster dedusting, up to standard emptying, meet environmental requirement.
Steam flow process of the present invention is: soft water supplementing water or steam turbine condensate water are by after low-level (stack-gas) economizer (16) heating, send into oxygen-eliminating device (14) deoxygenation, water after deoxygenation is delivered to after high-temperature economizer (17) heating through feed pump (15) pressurization, send into drum (8), water in drum absorbs flue gas heat by radiation water-cooling screen (22), fin panel casing (11) and evaporimeter (18), produce steam, the steam in drum (8) sends into storage heater (13) and user by the outer of drum top for jet chimney (12).The steam flow process of vaporization water-cooled expansion chamber is that the pressurization of drum water is delivered to water cooled membrane wall (232) by pipeline by the forced circulation pump (231) of expansion chamber, in expansion chamber water cooled membrane wall (232), absorb heat become steam water interface, returned in drum by pipeline and let off steam, thus form forced cooling and circulating system.
The production technology of electric arc furnaces is intermittence, when electric arc furnaces (1) stop blowing, when waste heat boiler (7) can not produce steam, now by storage heater (13) to user's steam supply, ensure the outer pressure stability for steam, satisfied production and life use.
The advantage of embodiment 1 is that adiabatic expansion chamber has certain heat storage capacity, has certain regulating action to the amplitude of variation of the temperature of flue gas, and reduce the fluctuation of quantity of steam, shortcoming is that expansion chamber is higher to refractory material requirement, and investment is large, and the expansion chamber life-span is short.
Embodiment 2 Vaporizing cooling expansion chamber, its advantage is small investment, and the expansion chamber life-span is long; Shortcoming to increase forced circulation system, and operating cost is higher.
The above is only preferably two kinds of embodiments of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. an electric-arc furnace steelmaking fume afterheat efficient system for reclaiming, comprise the movable flue (4) of electric arc furnaces (1), flue (5) fixed by electric arc furnaces, expansion chamber (23), boiler high temperature flue (6), waste heat boiler (7), storage heater (13), oxygen-eliminating device (14), it is characterized in that: described movable flue (4) and fixing flue (5) inner side establish inner thermal insulation device; Described waste heat boiler is water-tube boiler, if drum (8), water-cooled radiation heat transfer room (10), convection heat-exchange chamber (19); One end of described electric arc furnaces movable flue (4) is connected with arc furnace cover four hole flue, the other end is connected with the one end of fixing flue (5), fixing flue (5) is connected with expansion chamber (23), establishes boiler high temperature flue (6) between expansion chamber (23) and waste heat boiler (7); One end of described waste heat boiler water-cooled radiation heat transfer room (10) and boiler high temperature flue (6), the other end of water-cooled radiation heat transfer room (10) is connected with convection heat-exchange chamber (19) front end; The rear end of convection heat-exchange chamber (19) is connected with the exit flue (24) of waste heat boiler (6); The drum (8) of described radiation type waste heat boiler is established outer for jet chimney (12), and jet chimney (12) establishes storage heater (13) to outer confession.
2. a kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming according to claim 1, is characterized in that: heat-insulation layer and wearing layer are established in described movable flue (4) and fixing flue (5) inner side.
3. a kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming according to claim 2, it is characterized in that: described movable flue (4) and the heat-insulation layer material of fixing flue (5) are insulated pouring material, described movable flue (4) and the wearing layer material of fixing flue (5) are corundum castable.
4. a kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming according to claim 1, is characterized in that: establish radiation water-cooling screen (22) and fin panel casing (11) in described water-cooled radiation heat transfer room (10).
5. a kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming according to claim 2, it is characterized in that: described radiation water-cooling screen (22) becomes screen formula by row's steel pipe each other by Plate Welding, described radiation water-cooling screen (22) hangs and is installed in water-cooled radiation chamber, the upper end of described radiation water-cooling screen (22) is connected with drum (8) by pipeline, header, and the lower end of described radiation water-cooling screen (22) is connected with drum (8) by pipeline, header.
6. a kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming according to claim 2, it is characterized in that: described radiation water-cooling screen (22) is made up of the parallel steel pipe of a row, described radiation water-cooling screen (22) hangs and is installed in water-cooled radiation chamber, the upper end of described radiation water-cooling screen (22) is connected with drum (8) by pipeline, header, and the lower end of described radiation water-cooling screen (22) is connected with drum (8) by pipeline, header.
7. a kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming according to claim 1, it is characterized in that: described convection heat-exchange chamber (19) establishes evaporimeter (18), high-temperature economizer (17) and low-level (stack-gas) economizer (16), described high-temperature economizer (17) outlet is connected with drum (8) by pipeline.Described high-temperature economizer (17) import is connected with oxygen-eliminating device (14) by pipeline, water pump.
8. a kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming according to claim 1, ash bucket (21) and ash exhauster (20) are established in described (10) bottom, waste heat boiler water-cooled radiation heat transfer room and convection heat-exchange chamber (19) bottom.
9. a kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming according to claim 1, described expansion chamber (23) is adiabatic expansion chamber; Arch top established by described expansion chamber (23), and its internal layer adopts corundum material to build by laying bricks or stones; Described boiler high temperature flue is preferably adiabatic flue, and adiabatic flue internal layer is preferably built by laying bricks or stones with high alumina refractories.
10. a kind of electric-arc furnace steelmaking fume afterheat efficient system for reclaiming according to claim 1, described expansion chamber (23) is preferably vaporization water-cooled expansion chamber; Water cooled membrane wall (232) is established at the side wall of expansion chamber (23) and top; Protective layer is established in the bottom of expansion chamber water cooled membrane wall (232), and protective layer adopts castable cast.The water inlet pipe of expansion chamber water cooled membrane wall (232) is connected by the outlet of pipeline with expansion chamber forced circulation pump (231), the water manifold that goes out of expansion chamber water cooled membrane wall (232) is connected with drum (8) by pipeline, and the water inlet of expansion chamber forced circulation water pump (231) is connected with drum (8) by pipeline, valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410685235.9A CN104359326A (en) | 2014-11-21 | 2014-11-21 | System for efficiently recovering steel-making flue gas residual heat of electric-arc furnace |
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| CN201410685235.9A CN104359326A (en) | 2014-11-21 | 2014-11-21 | System for efficiently recovering steel-making flue gas residual heat of electric-arc furnace |
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| CN104359326A true CN104359326A (en) | 2015-02-18 |
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| CN201410685235.9A Pending CN104359326A (en) | 2014-11-21 | 2014-11-21 | System for efficiently recovering steel-making flue gas residual heat of electric-arc furnace |
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| CN114459258A (en) * | 2022-02-15 | 2022-05-10 | 江苏大学 | Electric arc furnace flue gas system with waste heat recovery and energy storage functions |
| CN117268125A (en) * | 2023-11-23 | 2023-12-22 | 信丰县包钢新利稀土有限责任公司 | Method for purifying and treating neodymium iron boron waste roasting waste gas |
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