CN111336811A - Heat accumulating type aluminum melting furnace - Google Patents
Heat accumulating type aluminum melting furnace Download PDFInfo
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- CN111336811A CN111336811A CN202010167748.6A CN202010167748A CN111336811A CN 111336811 A CN111336811 A CN 111336811A CN 202010167748 A CN202010167748 A CN 202010167748A CN 111336811 A CN111336811 A CN 111336811A
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 244
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 242
- 238000002844 melting Methods 0.000 title claims abstract description 92
- 230000008018 melting Effects 0.000 title claims abstract description 92
- 239000007788 liquid Substances 0.000 claims abstract description 60
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000003546 flue gas Substances 0.000 claims abstract description 38
- 238000002485 combustion reaction Methods 0.000 claims abstract description 6
- 239000000155 melt Substances 0.000 claims abstract description 4
- 239000000779 smoke Substances 0.000 claims description 42
- 238000003860 storage Methods 0.000 claims description 16
- 239000004411 aluminium Substances 0.000 claims description 12
- 238000002955 isolation Methods 0.000 claims description 12
- 238000012544 monitoring process Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 230000001172 regenerating effect Effects 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 238000007654 immersion Methods 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 abstract description 8
- 239000000446 fuel Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/14—Arrangements of heating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/0806—Charging or discharging devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/20—Arrangement of controlling, monitoring, alarm or like devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/14—Arrangements of heating devices
- F27B2014/146—Recuperation of lost heat, e.g. regenerators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/007—Systems for reclaiming waste heat including regenerators
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a heat accumulating type aluminum melting furnace. The disclosed aluminum melting furnace comprises a furnace body, wherein a feed inlet is arranged on the furnace body, and is characterized in that a burner, an aluminum ingot melting platform and a molten pool are arranged in the furnace body, a discharge outlet is arranged at the bottom of the molten pool, hot flue gas generated by combustion of the burner heats and melts the aluminum ingot on the aluminum ingot melting platform, and liquid aluminum flows into the molten pool; then the mixture is discharged from a discharge hole; and a heat exchange pipeline is further arranged in the furnace body, an inlet of the heat exchange pipeline is positioned above the molten pool, the heat exchange pipeline extends into the molten pool from the inlet to form at least one heat exchange pipe positioned in the molten pool, and the at least one heat exchange pipe continuously extends out of the furnace body to be connected with the heat accumulator. The high-temperature flue gas in the aluminum melting furnace heats the aluminum liquid through the heat exchanger, so that the utilization level of the waste heat of the flue gas is improved, and the use amount of fuel is saved.
Description
Technical Field
The invention relates to aluminum processing equipment, in particular to a novel heat accumulating type aluminum melting furnace.
Background
The aluminum melting furnace is the most common equipment in the aluminum processing and casting industry, and the melting process belongs to the production link with the largest energy and material consumption in the aluminum processing industry, so the working performance of the aluminum melting furnace directly influences the economy of the whole industry.
The traditional aluminum melting furnace mainly has the following problems in use:
(1) the poor temperature self-control capability causes local overheating of the aluminum liquid, and the surface of the aluminum liquid is easy to generate physicochemical phenomena such as oxidation, hydrogen evolution and the like, which affect the quality of aluminum products on one hand and increase the burning loss of the aluminum products on the other hand.
(2) The heat exchange organization is poor, the heat loss is serious, the smoke exhaust loss is as high as 35-40%, and the heat dissipation loss is as high as 10-15%, so that the natural gas consumption is large.
(3) The mode of directly flushing the aluminum liquid by flame is mostly adopted, so that the local overheating of the surface of the aluminum liquid is easily caused, and the physicochemical phenomena of oxidation, hydrogen evolution and the like are easily generated on the surface of the aluminum liquid, which affect the quality of aluminum products on one hand and increase the burning loss of the aluminum products on the other hand.
(4) The traditional aluminum melting furnace is typical periodic high-temperature melting equipment, from the time of feeding aluminum ingots into the furnace to the time of finishing melting, the traditional aluminum melting furnace can be roughly divided into a charging period, a melting initial period, a melting middle period, a melting later period, a heating period, a refining period and a heat preservation period, and the periodic working system greatly influences the smelting efficiency of the aluminum melting furnace and is not beneficial to the expansion of the production scale of enterprises.
Disclosure of Invention
Aiming at the defects or shortcomings of the prior art, the invention provides a novel heat accumulating type aluminum melting furnace.
The invention provides a heat accumulating type aluminum melting furnace which comprises a furnace body, wherein a feeding hole is formed in the furnace body, a burner, an aluminum ingot melting platform and a molten pool are arranged in the furnace body, a discharging hole is formed in the bottom of the molten pool, hot smoke generated by combustion of the burner heats and melts an aluminum ingot on the aluminum ingot melting platform, and liquid aluminum flows into the molten pool; then the mixture is discharged from a discharge hole;
the furnace body is also internally provided with a heat exchange pipeline, the heat exchange pipeline is provided with an inlet and at least one heat exchange tube, the inlet is positioned above the molten pool, the inlet extends into the molten pool to form at least one heat exchange tube positioned in the molten pool, and the at least one heat exchange tube continuously extends out of the furnace body to be connected with the heat accumulator.
Optionally, the burner is located above the aluminum ingot melting platform, the aluminum ingot melting platform is located beside the molten pool, and a slope is arranged between the aluminum ingot melting platform and the molten pool.
Optionally, an inlet, a vertical heat exchange tube and at least one heat exchange tube are arranged on the heat exchange pipeline, the inlet extends downwards along the side wall of the furnace body to form the vertical heat exchange tube, at least one heat exchange tube extends vertically from the vertical heat exchange tube in parallel, and the at least one heat exchange tube is located in the molten pool.
Optionally, a smoke outlet is arranged on the furnace body and used for discharging flue gas in the furnace in a proper amount at proper time according to process requirements.
Furthermore, at least one heat exchange tube extends out of the furnace body and is connected with at least one heat accumulator, and the heat accumulator is used for collecting waste heat in the furnace body and then heating oxidizing gas required by the work of the combustor.
Furthermore, a plurality of through holes are formed in the heat exchange tube, each through hole is connected with a heat tube, the hot side of each heat tube is used for contacting hot flue gas, and the cold side of each heat tube is used for contacting aluminum liquid.
Further, a heat exchange plate is arranged in the furnace body and above the molten pool, one side of the heat exchange plate close to the aluminum ingot melting platform is not in contact with the aluminum ingot melting platform to form an aluminum liquid inlet, a plurality of solid heat exchange tubes or fin plates are inserted on the heat exchange plate, and the hot side of each solid heat exchange tube is in contact with flue gas and the cold side of each solid heat exchange tube is in contact with aluminum liquid.
And the aluminum ingot melting device is further characterized in that an aluminum ingot melting platform II is arranged in the molten pool and used for placing aluminum ingots, and during work, the aluminum ingots placed on the aluminum ingot melting platform are soaked in the aluminum liquid and are heated and melted in an immersion type heating mode.
Further, an aluminum liquid height monitor is arranged on the side wall above the molten pool and used for monitoring the height of the aluminum liquid; and a furnace temperature monitor is arranged inside the furnace body and used for monitoring the temperature in the furnace.
Further, a feeding system is arranged at the feeding port, and comprises an aluminum ingot feeding chamber, an aluminum ingot temporary storage chamber and an aluminum ingot feeding manipulator; the aluminum ingot temporary storage chamber is positioned below the aluminum ingot feeding chamber, and a first smoke isolation door is arranged between the aluminum ingot temporary storage chamber and the aluminum ingot feeding chamber; aluminium ingot feeding manipulator is installed in the feed inlet top for transport the aluminium ingot in the aluminium ingot room of keeping in to aluminium ingot melt the platform on, and aluminium ingot feeding manipulator and aluminium ingot keep in and be equipped with the isolated door of second flue gas between the room.
Further, the aluminum ingot melting platform is characterized in that an aluminum ingot height monitor is arranged above the aluminum ingot melting platform and used for judging whether an aluminum ingot needs to be added newly.
The invention has the beneficial effects that:
the aluminum melting furnace can synchronously heat the aluminum solution while melting the aluminum ingot by flame direct blowing, greatly saves the heating time of the aluminum liquid, and shortens the production period of the finished aluminum ingot; the furnace body is directly used as a heat preservation medium of a flue gas pipeline, so that the heat dissipation loss of high-temperature flue gas is reduced, and the utilization efficiency of energy is improved;
meanwhile, high-temperature flue gas in the furnace heats the aluminum liquid through the heat exchanger, so that the utilization level of the waste heat of the flue gas is improved, and the use amount of fuel is saved; on the other hand, the heating process of the aluminum liquid is carried out in the molten pool, so that the contact area of flame and the aluminum liquid is reduced, and the burning loss of the aluminum material is reduced;
furthermore, a bypass exhaust port is arranged on the outer side of the novel heat accumulating type aluminum melting furnace body, and the influence degree of the over-temperature or the overpressure in the aluminum melting furnace on the safety of the aluminum melting furnace can be weakened.
Drawings
Fig. 1 is a plan view of a regenerative aluminum melting furnace of embodiment 1;
fig. 2 is a front view of the regenerative aluminum melting furnace of embodiment 1;
FIG. 3 is a cross-sectional view A-A of FIG. 1;
FIG. 4 is a cross-sectional view B-B of FIG. 3;
fig. 5 is a structural example of a heat exchange tube of embodiment 2;
FIG. 6 is an example of the in-bath structure of example 3;
FIG. 7 is an example of the structure of the molten pool of example 4.
In the figure: 1-a first combustor control valve, 2-a first combustor, 3-a first heat accumulator, 4-a second heat accumulator, 5-a second combustor control valve, 6-a second combustor, 7-a furnace body, 8-an aluminum ingot feeding system, 9-a smoke exhaust valve, 10-a smoke exhaust port and 11-an aluminum liquid discharge valve; 12-a discharge port, 13-an aluminum ingot blanking chamber, 14-an aluminum ingot feeding manipulator, 15-a first smoke isolation door, 16-an aluminum ingot feeding chamber, 17-a second smoke isolation door, 18-an aluminum ingot temporary storage chamber and 1-9 in-furnace temperature monitors; 20-pore plate and 21-aluminum liquid height monitor; 22-an aluminum ingot height monitor, 23-an aluminum ingot; 24-air inlet valve II, 25-air inlet valve II, 26-aluminum ingot melting platform, 27-slope and 28-molten pool; 29-an aluminum liquid temperature monitor, 30-a vertical heat exchange tube, 31-a smoke discharge port I, 32-a smoke discharge valve I, 33-a smoke discharge port II, 34-a smoke discharge valve II, 35-a horizontal heat exchange tube, 36-an air inlet valve I, 37-an air inlet I, 38-a heat pipe I, 39-a heat pipe smoke flow channel, 40-a heat exchange plate, 41-a solid heat exchange tube and 42-an aluminum ingot melting platform II.
Detailed Description
The following definitions apply to terms used in this specification unless otherwise limited by special circumstances.
Moreover, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present valve belongs.
In case of conflict, the present specification, including definitions, will control.
For the purposes of the present invention, some terms used in this specification have the following meanings:
as used herein, the directional terms "upper", "lower", "side", "bottom", "opposite side" are used in a direction that is consistent with the specific direction on the page of the drawings attached to the specification.
Example 1:
the heat accumulating type aluminum melting furnace of the embodiment, referring to fig. 1, comprises a furnace body 7, wherein a feeding hole is arranged on the furnace body, a burner 2, an aluminum ingot melting platform 26 and a molten pool 28 are arranged in the furnace body, a discharging hole 12 is arranged at the bottom of the molten pool, an aluminum ingot 23 is placed on the aluminum ingot melting platform through the feeding hole, hot smoke generated by combustion of the burner heats and melts the aluminum ingot, and liquid aluminum flows into the molten pool and is discharged through the discharging hole; in order to effectively recycle the waste heat in the aluminum ingot melting process, heat exchange pipelines (30, 35) are also arranged in the furnace, the heat exchange pipelines are used for introducing the waste heat/hot flue gas into the molten pool to exchange heat with the aluminum liquid and then outputting the heat to the outside of the furnace, the heat exchange pipelines are further recycled to the heat accumulator, inlets of the corresponding heat exchange pipelines are arranged above the molten pool and extend into the molten pool from the inlets, specifically, the inlets extend downwards vertically along the inner side wall of the furnace to form vertical heat exchange pipes, then, the vertical heat exchange pipes are parallelly and vertically shunted out of a plurality of horizontal heat exchange pipes 35, enter the molten pool 28, penetrate through the molten pool and extend out.
The working process of the aluminum melting furnace in the example is as follows:
(1) high-temperature flame generated by the burner directly impacts the surface of the aluminum ingot, the aluminum ingot is quickly melted into aluminum liquid under the action of strong convection and radiation heat exchange, and the aluminum liquid flows into a molten pool through a slope;
(2) the high-temperature flue gas continuously heats the aluminum solution through a tubular heat exchanger in the molten pool, so that the temperature of the aluminum solution is raised to a designed temperature value;
(3) the medium temperature flue gas generated after heating the aluminum liquid is discharged into the atmosphere after part of waste heat is recovered by the heat accumulator.
The positional relationship of the work units in the furnace is such that the melting of the aluminum ingot can be efficiently and smoothly performed, for example, the aluminum ingot melting platform is provided at one side in the furnace, the molten bath is provided at the side thereof, and the burner is installed above the aluminum ingot melting platform and directed toward the center of the aluminum ingot melting platform 26. As shown in FIG. 1, a slope 27 is provided between the aluminum ingot melting platform 26 and the molten bath 28, further, a perforated plate 20 may be provided at the position of the molten aluminum outflow platform, and the perforated plate 20 may also be located on the contact line of the aluminum ingot melting platform 26 and the slope platform 27 and arranged vertically.
In a further scheme, a heat accumulator is connected to the heat exchange tube extending out of the furnace body, and the heat accumulator is used for preheating oxidizing gases such as air or oxygen required by the work of the combustor after accumulating waste heat. The heat accumulator can be connected to realize alternate work, and correspondingly, a plurality of burners can be arranged in the burner furnace.
As shown in fig. 4, the horizontal heat exchange tube 35 passes through the molten bath 28 and is connected with the first heat accumulator 3 and the second heat accumulator 4, the flue gas is heat exchanged between the first heat accumulator 3 and the second heat accumulator 4 and then is connected with an external flue through a pipeline, wherein the first heat accumulator is provided with a first flue gas discharge port 31 and a first flue gas discharge valve 32, and the second heat accumulator is provided with a second flue gas discharge port 33 and a second flue gas discharge valve 34;
correspondingly, the furnace body is provided with two combustors, a combustor I2 and a combustor II 6, a combustor control valve I1 is arranged at an inlet of the combustor I, and a control valve II 5 is arranged at an inlet of the combustor II, wherein the combustor I2 is externally connected with a heat accumulator I, the combustor II 6 is externally connected with a heat accumulator II 4, and during combustion, the furnace body works by utilizing preheated air heated by the corresponding heat accumulators.
From the perspective of reasonable space utilization, the first heat accumulator 3 and the second heat accumulator 4 may be located below the aluminum ingot melting platform 26, and the two burners are located on the side where the heat accumulators are located and are installed on the side wall of the furnace body 7. While ensuring that the two burners are directed toward the center of the aluminum ingot melting platform 26.
In a more preferable example, in order to better control the temperature in the furnace and properly discharge the flue gas in the furnace at proper time, a smoke outlet 10 is preferably arranged on the top of the furnace body, and a smoke discharge valve 9 is arranged on the smoke outlet 10. As shown in fig. 2, the exhaust port is provided at the top of the furnace above the molten bath.
In order to realize automatic feeding, a feeding hole of the furnace body is provided with a feeding system which mainly comprises an aluminum ingot feeding chamber 16, an aluminum ingot temporary storage chamber 18 and an aluminum ingot feeding manipulator 14, and a smoke isolation door is arranged between each stage of feeding working units. Specifically, as shown in fig. 3, the aluminum ingot feeding system comprises an aluminum ingot blanking chamber 13, an aluminum ingot feeding chamber 16, an aluminum ingot temporary storage chamber 18, and an aluminum ingot feeding manipulator 14, a first smoke isolation door 15 and a second smoke isolation door 17 which are located in the aluminum ingot blanking chamber 13. Wherein, the aluminum ingot blanking chamber 13 is positioned above the aluminum melting furnace cavity 7 and is positioned on the same vertical line with the aluminum ingot melting platform 26; the aluminum ingot feeding manipulator 14 is suspended at the top of the aluminum ingot blanking chamber 13 and can horizontally move to the aluminum ingot temporary storage chamber 18 during working so as to grab and put aluminum ingots; a first flue gas isolation door 15 is arranged between the temporary aluminum ingot storage chamber 18 and the aluminum ingot blanking chamber 13 and is used for isolating flue gas between the aluminum ingot blanking chamber 13 and the temporary aluminum ingot storage chamber 18; and a second smoke isolation door 17 is arranged above the temporary aluminum ingot storage chamber 18 and used for isolating smoke between the temporary aluminum ingot storage chamber 18 and the aluminum ingot feeding chamber 16. Further, an aluminum ingot height monitor may be installed above the aluminum ingot melting platform for determining whether an aluminum ingot needs to be newly added, as shown in fig. 3, the aluminum ingot height monitor 22 is disposed on the inner sidewall of the furnace body above the aluminum ingot melting platform.
In order to realize automatic monitoring and management of work in the furnace, a temperature monitor 19 is arranged in the furnace, an aluminum liquid height monitor 21 and an aluminum liquid temperature monitor 29 are arranged in a molten pool, and the temperature monitor 19 in the furnace is positioned on the inner wall surface of a cavity 7 of the aluminum melting furnace and used for monitoring the temperature of smoke in the furnace; the molten aluminum height monitor 21 is positioned on the wall surface of the molten pool 28 and is used for monitoring the height of molten aluminum in the molten pool 28; an aluminum liquid temperature monitor 29 may be positioned at the bottom of the molten bath 28 and near the aluminum liquid discharge port 12 for monitoring the discharge temperature of the aluminum solution.
To explain the above structure example more fully, a specific working process example is:
(1) when the aluminum melting furnace is started for the first time, no aluminum liquid exists in the molten pool 28, and in order to prevent dry burning, the first smoke discharge port 31, the first smoke discharge valve 32, the second smoke discharge port 33 and the second smoke discharge valve 34 need to be closed, and the bypass smoke discharge valve 9 needs to be opened, so that the bypass smoke discharge port 10 can discharge smoke;
(2) opening a second smoke isolation door 17, enabling the aluminum ingot to enter an aluminum ingot temporary storage chamber 18 through an aluminum ingot feeding chamber 16, and then closing the second smoke isolation door 17 to prevent smoke inside the aluminum melting furnace from leaking;
(3) opening the first smoke isolation door 15, horizontally moving the aluminum ingot feeding manipulator 14 to the temporary aluminum ingot storage chamber 18, grabbing aluminum ingots and putting the aluminum ingots on the aluminum ingot melting platform 26;
(4) the first burner control valve 1 is opened, the first burner 2 works normally, high-temperature flame generated by burning directly impacts the surface of the aluminum ingot 23, and molten aluminum generated by melting flows into a molten pool 28 along the slope platform 27 through the pore plate 20;
(5) after the liquid level of the aluminum liquid in the molten pool 28 reaches a certain height, a second smoke discharge valve 34 is opened, and a first smoke discharge valve 32 on the first heat accumulator is kept closed continuously;
(6) air enters the combustor I2 through the heat accumulator I3 to serve as an oxidant;
(7) high-temperature flue gas generated by combustion enters the horizontal heat exchange tube 35 through the vertical heat exchange channel 30, the purpose is to heat the aluminum solution, the heated flue gas enters the heat accumulator II 4, and finally the flue gas is discharged through the flue gas discharge port II 33;
(8) the aluminum liquid height monitor 21 is used for monitoring the height of the aluminum liquid, and when the height of the aluminum liquid is higher than a design value, the aluminum liquid discharge valve 11 is opened to discharge the aluminum liquid;
(9) the aluminum liquid temperature monitor 29 is used for monitoring the aluminum liquid temperature near the aluminum liquid discharge port 12, if the aluminum liquid temperature near the aluminum liquid discharge port 12 is lower than a design value, the opening degree of the bypass smoke exhaust valve 9 is reduced or the gas supply amount is increased, and if the aluminum liquid temperature near the aluminum liquid discharge port 12 is higher than the design value, the opening degree of the bypass smoke exhaust valve 9 is increased or the gas supply amount is reduced;
(10) the aluminum ingot height monitor 22 is used for monitoring the height of an aluminum ingot 23, if the height of the aluminum ingot 23 is lower than a design value, the aluminum ingot feeding system 8 is started, and if the height of the aluminum ingot 23 is higher than the design value, the aluminum ingot feeding system 8 stops running;
(11) and after the temperature in the second heat accumulator 4 tends to be constant, the first combustor 2 stops working, meanwhile, the second combustor 6 is started, and the first heat accumulator 3 is started to start heat accumulation.
Example 2:
in order to increase the utilization rate of waste heat, a heat pipe can be directly arranged on the horizontal heat exchange pipe and is used for fully exchanging heat between hot flue gas and aluminum liquid; the cross section area of the horizontal surface of the horizontal heat exchange tube can be properly increased to form a flue gas channel of the heat pipe; the heat pipe can also be arranged on the flue gas channel of the heat pipe.
Referring to fig. 5 specifically, the horizontal heat exchange tubes 35 are changed into heat pipe flue gas runners 39, the heat pipe flue gas runners 39 are distributed horizontally, and the structure is not limited to horizontal thin channels (the channel height is determined by practical engineering, for example, 0.1m), equally spaced or unequally indirect round pipelines, and equally spaced or unequally indirect square pipelines. The first heat pipe 38 is vertically inserted into a heat pipe flue gas flow passage 39, the hot side of the heat pipe contacts flue gas, the cold side of the heat pipe contacts aluminum liquid, and the heat pipe structure is favorable for resisting high temperature on one hand and can enhance heat exchange on the other hand.
Example 3:
in order to reduce the corrosion of the flue gas to the aluminum liquid and reduce the burning loss of the aluminum liquid. A heat exchange plate 40 is arranged in the furnace body and close to the position above the molten pool, and furthermore, a solid heat exchange tube with high heat conductivity can be arranged on the heat exchange plate.
As shown in FIG. 6, the heat exchange plate 40 is horizontally disposed and hermetically connected to the wall of the molten bath, and a square hole (not limited to a square shape) is formed in a side of the heat exchange plate 40 close to the aluminum ingot melting platform 26, and a baffle plate is disposed downward along the hole and is inserted into the aluminum liquid without preventing the aluminum liquid from horizontally flowing in the molten bath, and in addition, the aluminum liquid is not higher than the plate platform 40 during operation.
In a further scheme, a solid heat exchange tube 41 with high thermal conductivity is inserted into the heat exchange plate 40, the hot side of the heat exchange tube is contacted with flue gas, and the cold side of the heat exchange tube is contacted with aluminum liquid.
In a further scheme, the solid heat exchange tube can be replaced by other fin plates which play the same role.
Example 4:
in order to improve the melting amount of the aluminum melting furnace in unit time, a second melting platform can be arranged in the molten pool. As shown in FIG. 7, a second aluminum ingot melting platform 42 is additionally arranged in the molten pool. And during normal work, putting an aluminum ingot on the second melting platform 42, wherein the height of the aluminum ingot is not higher than the liquid level of the molten pool, and heating and melting the aluminum ingot in an immersion heating mode.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (11)
1. A heat accumulating type aluminum melting furnace is characterized by comprising a furnace body, wherein a feeding hole is formed in the furnace body, a burner, an aluminum ingot melting platform and a molten pool are arranged in the furnace body, a discharging hole is formed in the bottom of the molten pool, hot smoke generated by combustion of the burner heats and melts an aluminum ingot on the aluminum ingot melting platform, and liquid aluminum flows into the molten pool and is discharged from the discharging hole;
the furnace body is also internally provided with a heat exchange pipeline, the heat exchange pipeline is provided with an inlet and at least one heat exchange tube, the inlet is positioned above the molten pool, the inlet extends into the molten pool to form at least one heat exchange tube positioned in the molten pool, and the at least one heat exchange tube continuously extends out of the furnace body to be connected with the heat accumulator.
2. A regenerative aluminum melting furnace as claimed in claim 1 wherein the burners are located above the ingot melting platform and the ingot melting platform is located alongside the molten bath with a ramp between the ingot melting platform and the molten bath.
3. A heat accumulating type aluminum melting furnace as claimed in claim 1, wherein the heat exchange pipeline is provided with an inlet, a vertical heat exchange pipe and at least one heat exchange pipe, the inlet extends downwards along the side wall of the furnace body to form the vertical heat exchange pipe, the vertical heat exchange pipe is provided with the at least one heat exchange pipe in parallel and vertically extending, and the at least one heat exchange pipe is positioned in the melting bath.
4. A heat accumulating type aluminum melting furnace as claimed in claim 1, 2 or 3, wherein the furnace body is provided with a smoke outlet for discharging the smoke in the furnace in a proper amount at a proper time according to the process requirement.
5. A regenerative aluminum melting furnace as claimed in claim 1, 2 or 3 wherein the at least one heat exchange tube extends out of the furnace body and is connected to at least one heat accumulator for collecting residual heat in the furnace body and heating the oxidizing gas required for operation of the burner.
6. A regenerative aluminum melting furnace as claimed in claim 1, 2 or 3 wherein the heat exchange tubes are provided with a plurality of through holes, each through hole is connected with a heat pipe, the hot side of the heat pipe is used for contacting hot flue gas, and the cold side of the heat pipe is used for contacting aluminum liquid.
7. A regenerative aluminum melting furnace as claimed in claim 1, 2 or 3, wherein a heat exchange plate is arranged in the furnace body above the molten pool, one side of the heat exchange plate close to the aluminum ingot melting platform is not in contact with the aluminum ingot melting platform to form an aluminum liquid inlet, a plurality of solid heat exchange tubes or fin plates are inserted on the heat exchange plate, and the hot side of the solid heat exchange tubes is in contact with the flue gas and the cold side of the solid heat exchange tubes is in contact with the aluminum liquid.
8. A regenerative aluminum melting furnace as claimed in claim 1, 2 or 3 wherein a second ingot melting platform is provided in the molten pool for holding an aluminum ingot, and in operation, the aluminum ingot held on the second ingot melting platform is immersed in the molten aluminum and heated and melted by immersion heating.
9. The regenerative aluminum melting furnace as claimed in claim 1, 2 or 3, wherein an aluminum liquid height monitor is arranged on the side wall above the molten pool and used for monitoring the aluminum liquid height; and a furnace temperature monitor is arranged inside the furnace body and used for monitoring the temperature in the furnace.
10. A regenerative aluminum melting furnace as claimed in claim 1, 2 or 3, wherein a feed system is provided at the feed port, the feed system comprising an aluminum ingot feed chamber, an aluminum ingot temporary storage chamber and an aluminum ingot feeding robot; the aluminum ingot temporary storage chamber is positioned below the aluminum ingot feeding chamber, and a first smoke isolation door is arranged between the aluminum ingot temporary storage chamber and the aluminum ingot feeding chamber; aluminium ingot feeding manipulator is installed in the feed inlet top for transport the aluminium ingot in the aluminium ingot room of keeping in to aluminium ingot melt the platform on, and aluminium ingot feeding manipulator and aluminium ingot keep in and be equipped with the isolated door of second flue gas between the room.
11. A regenerative aluminum melting furnace as claimed in claim 9 wherein an aluminum ingot height monitor is mounted above the aluminum ingot melting platform for determining whether a new aluminum ingot needs to be added.
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| CN202010167748.6A CN111336811A (en) | 2020-03-11 | 2020-03-11 | Heat accumulating type aluminum melting furnace |
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| CN202010167748.6A CN111336811A (en) | 2020-03-11 | 2020-03-11 | Heat accumulating type aluminum melting furnace |
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Cited By (1)
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| CN113695550A (en) * | 2021-09-18 | 2021-11-26 | 重庆建设·雅马哈摩托车有限公司 | Unmanned die casting method for die casting island |
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