Shaft regenerative aluminum melting furnace
Shaft speedy energy conservation Al.melting furnace is a newly designed equipment with the aim of achieving high-effective energy conservation for continuous casting rolling other continuous processing. The type of furnace is able to fully meet with the requirement of continuous liquid aluminum supplying for processing such as aluminum continuous casting rolling, pressure casting, gravity casting, etc able to achieve the purpose of reducing energy consumption burning damage, improve product quality low labor intensity, improve working conditions uplift production efficiency.
The Shaft speedy energy conservation Al.melting furnace is usually used along with double chamber holding furnace (refining inside of holding chamber) or single chamber holding furnace (online refining), which will enable the function of continuous melting, refining continuous supplying aluminum liquid. Since the processing is continuous melting, it is not generally suggested to conduct alloy adjustment.
Shaft speedy energy conservation Al.melting furnace is mainly composed of bottom furnace shaft furnace. The followings are its main structure acteristics:
1. Adopting shaft furnace. Smoke waste heat shall be fully absorbed by the raw materials filled inside of the shaft, which reduces smoke exhausting temperature to less than 150℃. Meanwhile, heat efficiency can be uplifted oil consumption be reduced to 32kg/t.al. In addition, after preheated by the certain height shaft, materials shall be heated to the point of
2. Adopting high-speed flame shockwave heating. High-speed flame shall be directly sprayed up to preheated material the liquid aluminum in side of the smaller chamber, which does not only achieves fast melting, but also saves energy reduces burning damage.
3. Adopting upper lower outlet. The upper outlet shall be adopted when working continuously. During melting, there shall be certain depth of metal liquid existing in the chamber enabling part of the material melted in the liquid metal, which shall reduce the oxidation area moreover reduce burning damage (minimum value is around 0.6%). In addition, the liquid outlet temperature shall be increased because of the certain depth of the liquid metal. Aluminum slag can be also poured into holding furnace chamber prevent chamber aluminum slag accumulation.
4. Designing reasonable furnace door structure. The furnace door is small sealed well which does not only save heat lost but also provide convenient friendly operational atmosphere.
5. Furnace roof ging: Designing tipping bucket ging mechanism, embracing acteristics such as convenient ging, low labor intensity, small furnace temperature fluctuation longer service life.
6. Adopting high efficient energy conservation combustor which embraces acteristics such as easy ignition, fast temperature rising, speed fluid velocity, complete burning low coefficient of excess air, etc.
7. Characteristics of double chamber holding furnace：
A, adopting connected double chamber structure, which have advantages such as less area occupation, good temperature holding performance a effective application of smoke waste heat, etc.
B, the double chamber will run separately, guarantees continuous supply quality liquid metal to the following equipments.
C, holding furnace shall be only used for temperature rising holding, liquid refining slag skimming, sampling adjusting or some other procedures. It has smaller temperature fluctuation longer service life.
D, Air preheater shall be adopted to work with double chamber holding furnace, which will effective make use of smoke waste heat reduce energy conservation of holding furnace.
2, Service range：Processing of continuous liquid metal supplying without alloy components adjustment.
1, Melting processing of conducting aluminum billet wire rod (generally provide 5t/h melting furnace 8—10t Double chamber holding furnace）.
2, continuous semi-continuous casting rolling of sheet, strip foil without adjusting alloy components.
3, Pressure casting, gravity casting processing of continuous liquid metal supplying without alloy components adjustment.
3.Main Specification, dimension economic technical norms:
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Spec.
Item
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0.1ton
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0.3ton
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0.5ton
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0.7ton
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1ton
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2ton
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3ton
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5ton
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Rated melting speed（t/h）
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0.1
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0.3
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0.5
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0.7
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1.0
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2.0
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3.0
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5.0
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Max melting speed（t/h）
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0.15
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0.42
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0.65
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0.9
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1.5
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2.8
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4.1
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6.5
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Energy consumption
(104Kcal/t˙AL)
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≤85
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≤75
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≤65
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≤60
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≤55
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≤50
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≤45
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≤42
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Burning damage rate（%）
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≤0.8%
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Overhaul cycle（n）
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Melting furnace≥2
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holding furnace≥4
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Burner for melting furnace (104Kcal/t˙AL)
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15
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30
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30
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30
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60
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100
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160
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220
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Holding furnace rated capacity（t）
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0.3+0.3
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0.5+0.5
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1+1
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1.5+1.5
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2+2
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4+4
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6+6
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8+8
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Holding furnace max capacity（t）
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0.4+0.4
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0.7+0.7
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1.3+1.3
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1.8+1.8
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2.5+2.5
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4.8+4.8
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7+7
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9.3+9.3
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Shaft furnace opening diameter（φ）
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φ288
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φ348
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φ420
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φ466
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φ600
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φ900
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φ1000
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φ1200
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Fuels applicable
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Light diesel oil, Poor quality diesel oil, coal tar , raw pine oil, heavy oil, residual oil, crude oil, natural gas, coal gas, liquefied petroleum gas all kinds of oil & gas fuels coal.
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