KR200485687Y1 - Metal melting furnace and metal block for use in the metal melting furnace - Google Patents

Abstract

It is an object of the present invention to solve the conventional problems by improving the filling method of the metal ingot in the preheating column and the shape of the metal ingot used in the method, , And also provides a metal melting furnace capable of drastically reducing the amount of carbon dioxide emission and a metal ingot used in the metal melting furnace.
A melting furnace disposed below the preheating tower for heating and melting the metal ingot; a molten metal flow portion through which the molten metal flows; and a molten metal flow passage through which the molten metal passes through the molten metal circulation portion, Wherein the molten metal is dissolved sequentially from the bottom thereof by the melting burner and the molten metal is melted in succession from the bottom of the metal melting furnace, Is filled and piled so as to rise through the gap of the metal ingot.

Description

METAL MELTING FURNACE AND METAL BLOCK FOR USE IN THE METAL MELTING FURNACE BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a metal melting furnace and a metal ingot used in the metal melting furnace in a manufacturing process of a metal product, and more particularly to a metal melting furnace for improving the filling state of a metal ingot supplied to a pre- It is possible to prevent oxidation of the metal ingot, to prevent heat radiation inside the furnace, to improve the thermal efficiency, to accelerate the dissolution rate of the metal ingot, to significantly reduce the amount of carbon dioxide emission, The present invention relates to a metal melting furnace capable of improving the efficiency and reducing the unit of the fuel source, and a metal ingot used in the metal melting furnace.

BACKGROUND ART [0002] Conventionally, a dissolution maintaining furnace in which a metallic molten metal is melted by heat is known (Japanese Patent Publication No. 7-73215). The conventional metal dissolving furnace B includes a melting furnace 36 provided at the bottom of the preheating column 32 by injecting ingots and metal molds 40 of an irregular shape into the preheating column 32 as shown in Fig. The molten metal 35 is sequentially melted from the bottom and sent to the molten metal retaining chamber 33 to melt the molten metal 35 from the preheating tower 34 with the molten burner 36 provided at the bottom of the well adjacent to the molten metal retaining chamber 33, And sequentially supplies the molten metal 35 to a die casting machine (not shown). The flame 36a of the dissolving burner 36 successively dissolves the metal sulcus 40 at the bottom of the preheating column 32 and thereafter is rapidly heated up through the metal sulcus 40 by the high temperature exhaust gas, ) From the raw material input port 32a.

Since the metal shovel 40 mainly uses shrouded waste of scrap, it includes various shapes such as a bar shape, a disc shape, a molding, and the like. Therefore, since the metal troughs 40 injected into the preheating tower 32 are filled with each other, large and small gaps are formed between the metal troughs 40 so that the filling density of the metal trough 40 filled in the preheat tower 32 is low . As a result, the combustion exhaust gas of the dissolving burner 36 passes upward through the preheat tower 32 in a short time without any resistance, and is released to the atmosphere. Since the temperature of the combustion exhaust gas discharged to the atmosphere at this time is released to the atmosphere without sufficiently preheating the metal foil 40 at a high temperature, the overall heat efficiency of the metal dissolving and retaining furnace B is greatly lowered and a large heat loss is inevitable.

In addition, since the combustion exhaust gas is discharged to the incomplete combustion state before being completely burned up by passing through the pre-heating tower 32 in a short time as described above, the fuel consumption is increased accordingly. Therefore, the amount of carbon dioxide emission increases in proportion to the amount of fuel consumption and doubles environmental pollution. In addition, when the metal tongue 40 is used as the input material, since the filling density of the preheating tower 32 is low, the dissolution rate is low, which is a serious problem in terms of improvement in working efficiency.

In the case of using the metal tongue 40, the metal tongues 40 are intertwined with each other in the preheating column 32 to form an arch (or a bridge) in the middle, so that the metal tongue 40 below the arch does not fall, And the arch collapses to collide with the furnace bottom of the dissolution chamber 34 to damage the furnace bottom or contact the inner wall while the sharp tip of the metal sphere 40 passes through the preheat column 32, Which is a problem.

The present invention solves the above-mentioned problems at once by improving the filling method of the metal ingot in the preheating column as the metal melting furnace and the shape of the metal ingot used in the method, and more particularly, The present invention provides a metal melting furnace and a metal ingot used in the metal melting furnace, which can reduce the number of units and can reduce the amount of carbon dioxide emissions drastically.

According to a first aspect of the present invention, there is provided a method of manufacturing a honeycomb structure, comprising: a preheating tower for preheating and laminating a metal ingot; a melting burner installed below the preheating tower for heating and melting the metal ingot; And a molten metal storage portion having a molten metal storage portion in which the molten metal once passed through the molten metal distribution portion is stored; Wherein the metal ingot has the shape of a quadrangular pyramid, the length of one side of the bottom surface is 25 mm, the height from the bottom surface to the top of the toe is 25 mm, Characterized in that the length is 65 mm and the height from the bottom surface to the top of the head is 65 mm and the metal block is sequentially melted from the bottom portion thereof by the melting burner and the hot air is piled up through the gap of the metal ingot To a metal melting furnace.

According to a second aspect of the present invention, the metal melting furnace is characterized in that the filling rate of the metal ingot is 60 to 80% of a maximum volume capable of filling the metal ingot in the preheat tower.

According to a third aspect of the present invention, the metal melting furnace is characterized in that the filling rate is 60 to 70%.

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The invention according to claim 10 relates to a metal ingot used in a metal melting furnace according to any one of claims 1 to 3.

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Since the filling density in the preheating column 2 is high, the gap 21 generated between the metal blocks 20 is very small and the high temperature exhaust gas The gas slowly rises over the narrow gap 21 over time, preheating the metal ingot 20 sufficiently, and is released to the atmosphere as a low-temperature exhaust gas. As a result, the amount of fuel used is greatly reduced, thermal efficiency is greatly improved, and the amount of carbon dioxide emissions is greatly reduced. Since the high temperature exhaust gas rises in the preheat tower 2 over time, it is completely burned and CO, SO _x , NO _x and the like are mostly reduced as carbon dioxide and released as a clean exhaust gas.

In particular, since the shape of the metal ingot is a quadrangular pyramid shape, the shape is simple, so that it is not entangled with each other in the preheating column 2 to form an arch, and smoothly descends in the preheating column 2 to perform a smooth melting operation And the dissolution rate itself is also accelerated because it is preferentially dissolved from the edges and edges having thin thickness. When the corners of the metal ingot are rounded, the inner wall of the preheating tower 2 is not damaged while passing through the preheating tower 2. In addition, the gap 21 between the metal billets 20 injected into the preheating column 2 becomes very narrow, the exhaust gas of high temperature becomes difficult to pass between the metal billets 20, and the metal billets 20 melt It gets easier.

Further, according to the inventions as described in claims 2 and 3, the heat-generating efficiency can be improved when heating and melting the metal ingot, and the dissolution rate of the metal can be increased. Further, since the thermal energy generated in the melting furnace can be efficiently used, the unit of the fuel source can be reduced. Therefore, the amount of fuel consumption can be greatly reduced, and the amount of carbon dioxide emission can be significantly reduced as compared with the conventional method.

According to the design as described in claim 10, when such a metal ingot 20 is charged into the preheating column 2 due to the shape and the numerical value of the specified metal ingot 20, the gap between the metal ingots 20 21 is very narrow and the exhaust gas of high temperature is difficult to pass between the metal blocks 20 and at the same time it is easily melted. Therefore, it is possible to conduct thermal energy quickly to the center of the metal ingot, Can be filled with a high filling rate. Therefore, the heat-generating efficiency can be improved and the amount of carbon dioxide emission can be reduced.

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1 is a schematic cross-sectional view of a metal melting furnace according to the present invention.
2 is a plan sectional view of Fig.
Fig. 3 is an enlarged front view showing a laminated state of the metal ingot according to the present invention. Fig.
Fig. 4 is a plan view of Fig. 3. Fig.
5 is an enlarged front view showing a laminated state of another embodiment of the metal ingot according to the present invention.
Fig. 6 is a view showing the relationship between the space ratio of the melting furnace and the heat storage at the time of metal ingot heating.
7 is a view showing the heat recovery in the fourth embodiment.
8 is a view showing the heat storage in the comparative example.
Fig. 9 is a view showing the heat storage in the control example. Fig.
10 is a schematic cross-sectional view of a conventional metal dissolution maintenance furnace.

Hereinafter, the metal melting furnace according to the present invention and the metal ingot used in the metal melting furnace will be described in detail.

Fig. 1 is a schematic cross-sectional view of a metal dissolution maintenance furnace according to the present invention, and Fig. 2 is a plan sectional view of Fig. The metal melting furnace 1 of the present invention is a reflow furnace and includes a preheating column 2 for preheating and laminating the charged metal ingots 20 and a metal ingot 20 disposed below the preheating column 2, And a molten metal storage portion 3 for storing the molten metal once passing through the molten metal circulation portion 10 is temporarily stored in the molten metal storage portion 10 . The dissolved molten metal (5) flows into the molten metal storage section (3) and is maintained at a predetermined temperature. In the molten metal retaining chamber 3, the well 4 for pouring the molten metal 5 is communicated.

The preheating column 2 has a rectangular shape and a lower portion is a molten metal circulation portion 10 and a molten burner 6 is provided on the side wall of the molten metal circulation portion 10. The bottom surface of the molten metal circulation section 10 is inclined toward the molten metal retaining chamber 3 so that the molten metal 5 dissolved in the molten metal circulation section 10 flows into the molten metal retaining chamber 3 smoothly. A level sensing device 9 composed of a light emitter 9a and a light receiver 9b is arranged on the upper part of the preheating column 2. [

The molten metal retaining chamber 3 of the molten metal retaining chamber 3 is provided with a temperature maintaining burner 7 on the ceiling of the molten metal retaining chamber 3 and a molten metal retaining chamber 3 The flame is radiated to keep the molten metal 5 in the melt holding chamber 3 at a predetermined temperature. The temperature of the molten metal 5 in the molten metal holding chamber 3 is detected by a thermometer (not shown).

The well 4 adjacent to the molten metal retaining chamber 3 is a portion for raising the molten metal 5 and has an upper surface opened so that the molten metal 5 can be pumped up, And the molten metal 5 maintained at a predetermined temperature is supplied from the molten metal holding chamber 3 to the well 4 at all times.

A charging bucket 8 is provided outside the metal melting furnace 1 from the material storage to the material inlet 2a of the preheating column 2. The metal ingot 20 is supplied to the charging bucket 8, The material is introduced into the preheating column 2 from the material inlet 2a.

The shape of the metal ingot 20 used in the metal melting furnace 1 of the present invention is a polygonal pyramid shape or a frustum of polygonal pyramid shape. The reason why the metal ingot 20 is formed into a polygonal pyramid or a polygonal prism is that when the metal ingot 20 is introduced into the preheating column 2 from the material inlet 2a into the preheating column 2, And can be filled uniformly and at a high density. Details of the shape of the metal ingot 20 will be described later.

Next, the dissolving method using the metal ingot 20 will be described. The metal ingot 20 as a dissolving material is charged into the preheating column 2 from the material inlet 2a by the input bucket 8 but the metal ingot 20 injected at random is introduced into the preheating column 2 in a very dense state, . At this time, the gap 21 between the metal blocks 20 is narrow, and the passage resistance of the high temperature exhaust gas becomes very large. Since the shape of the metal block 20 is a polygonal pyramid or a polygonal pyramid with rounded corners and sides as described above, even if the metal block 20 is brought into contact with the inner wall of the preheating column 2, . The input amount is detected by the level sensing device 9 above the preheating column 2.

The metal packed bodies S of the metal ingots 20 in the preheating column 2 are sequentially melted from the bottom of the metal packed bodies S by the flame of the melting burner 6, (3). Since the metal ingot 20 is thinner than the corners and the central portion of the edge portions, the metal ingots 20 tend to increase in temperature and melt easily from these portions, so that the metal ingots 20 are smoothly and rapidly dissolved sequentially from the bottom of the metal sifting body S.

The high temperature combustion exhaust gas in which the metal ingot 20 at the bottom of the metal can compact (S) has been dissolved slowly rises over time in the preheat tower 2 through the narrow gap 21 between the metal ingots 20, The combustion exhaust gas itself has been completely burned in the meantime. CO, NO _x and SO _x contained in the flame ejected from the melting burner 6 are completely burned while passing through the gaps 21 between the metal blocks 20, exhaust gas discharged from the (2a) is warmed up enough to the metal bars (20) and is at a low temperature (compared to the prior art showed a temperature reduction of about 200 ℃), also substantially as the carbon dioxide only, NO _x, sO _x is also very small It becomes clean. As a result, the fuel consumption can be greatly reduced, achieving a fuel saving rate of about 16 to 30%.

In this combustion state, the inside of the furnace is maintained in a reduced state, and the combustion exhaust gas is slowly raised in the preheat column 2 to maintain the inside of the preheat column 2 at a constant pressure. So that the oxidation of the preheated metal mass 20 in the preheating column 2 is prevented.

Here, the relationship between the space ratio of the preheating column 2 and the heat storage at the time of metal ingot heating is shown in Fig.

As shown in the drawing, if the space ratio is too high (the filling rate of the metal ingot 20 is too low) (see the right graph), the loss of exhaust gas (hot gas) becomes large and the thermal efficiency decreases. On the other hand, if the space ratio is too low (the filling rate of the metal ingot 20 is too high) (see the graph on the left), other losses due to dispersion and heat accumulation of the furnace body become large and the thermal efficiency decreases.

Therefore, it is necessary to set the filling rate of the metal ingot 20 within an appropriate range in order to obtain high heat-generating efficiency as shown in the center graph of FIG.

The space ratio is a ratio of the total amount of the clearance 21 (see Figs. 3 to 5) to the volume of the preheating column 2 (volume capable of filling the metal ingot 20). The gap 21 is a space formed between the metal blocks 20 as described later.

In the present invention, the filling rate of the metal ingot 20 is 60 to 80%, preferably 60 to 70% of the maximum filling volume of the metal ingot 20 in the preheating column 2, more preferably 65 To 70%.

When the charging rate is in the range of the charging rate, the high heat-absorbing efficiency of about 85%, which is 30 to 50% higher in the heat-removing efficiency, can be obtained as compared with the case of the filling rate in the conventional method (control example to be described later). Therefore, the metal ingot 20 can be efficiently dissolved.

In addition, since the gaps 21 are appropriately formed in the preheating column 2, the heat energy is released to the outside of the preheating column 2, so that excessive heat energy is not stored in the preheating column 2. Therefore, the operation life of the preheating column 2 can be extended without fear of heat damage to the preheating column 2.

If the filling rate is less than 60%, the gap 21 (see Figs. 3 to 5) between the metal blocks 20 becomes large, and it becomes difficult to efficiently transfer the thermal energy between the metal blocks 20.

On the other hand, when the filling rate exceeds 80%, the metal blocks 20 are in close contact with each other. When heating in this state, oxygen (air) around the dissolving burner 6 tends to become insufficient, so that the combustion flame of the dissolving burner 6 may be turned off. Further, the oxygen (air) in the metal can compacted body S becomes insufficient by heating. Therefore, it is difficult to transfer the thermal energy between the metal blocks 20.

Therefore, when the filling rate is less than 60% or more than 80%, the heat-generating efficiency is lowered in any case, which is not preferable.

The specific surface area of the metal ingot charged into the preheating column 2 is preferably 500 to 650 cm ² / kg.

By setting the specific surface area to a range that is previously reported, a high filling rate (60 to 80%) can be realized and heat energy can be efficiently transferred to the metal block 20. Therefore, the dissolution of the metal mass 20 is promoted, and the dissolution rate is accelerated. Further, since thermal energy is efficiently transferred, it is possible to dissolve with a small amount of fuel, and the amount of fuel used can be reduced.

If the specific surface area is less than 500 cm < ² > / kg, it can not be a high packing rate. Therefore, the ratio of the gaps 21 in the preheating column 2 (metal packed bodies S) becomes large, so that heat energy is not efficiently transferred and a large amount of heat energy (fuel) is required. On the other hand, when the specific surface area exceeds 650 cm ² / kg, the filling speed becomes too high, and the heat-generating efficiency may be lowered.

The shape of the metal block 20 may be a frustum of quadrangular pyramid as shown in FIGS. 3 and 4, or a quadrangular pyramid as shown in FIG. In the case of a quadrangular pyramid, it is preferable that the quadrangular pyramid is a right quadrangular pyramid. When the metal ingot 20 is shaped into a quadrangular pyramidal or quadrangular pyramid, the gap 21 between the metal masses 20 becomes very narrow when the metal ingot 20 is introduced into the preheat column 2, It becomes difficult to pass through between the metal blocks 20 and becomes easy to melt. In addition, when the metal ingot 20 is shaped like a quadrangular pyramid, when heated (preheated), the molten metal 20 is melted first by dissolving in the apexes or edges of the quadrangular pyramid, and the thermal energy is transmitted toward the center of the quadrangular pyramid.

In addition, by making the shapes of the metal ingots 20 the same regular quadrangular pyramid shape, that is, in the shape of a square horn having the same specific surface area, the metal masses 20 can be uniformly dissolved.

Typically, the metal ingot 20 is injected into the preheat tower 2 at random. In the case where the metal masses 20 are a mixture of various shapes or a quadrangular pyramid shape but are not the same size, it is difficult to densely fill the metal ingot 20 as shown in Fig.

However, when the metal masses 20 are formed in the shape of square-shaped horns having the same specific surface area, when the metal masses 20 are put into the preheat tower 2, they are easily filled regularly as shown in FIG. That is, a metal packed body S having a high filling ratio can be obtained. Also, since the gaps 21 are formed uniformly as shown in Figs. 3 to 5, the thermal energy of the electric high-temperature gas spreads evenly over the entire metal packed bodies S.

As shown in FIG. 3 and FIG. 5, the metal masses 20 are densely packed so that heat energy is easily transferred between the metal masses 20, thereby improving the heat-generating efficiency.

When the shape of the metal mass 20 is a square horn and the specific surface area is all the same in the range of 500 to 650 cm ² / kg, the heat-generating efficiency can be improved.

In addition, since there is an appropriate gap 21 between the metal blocks 20, thermal energy of the hot gas generated during melting of the metal blocks 20 can be widened, and the whole of the metal packed bodies S is preheated . Therefore, the dissolution rate of the metal ingot 20 is increased, and the molten metal 5 can be efficiently obtained. In this case, the fuel source unit can be reduced by 30 to 60% as compared with the conventional method (the control example below). In addition, carbon dioxide emissions can be reduced by 30-40% as fuel usage is reduced.

The size of the metal ingot 20 is preferably smaller than that of the metal ingot 20 of the same material used in the conventional method (for example, 5 kg aluminum ingot of the control example).

The size of the metal ingot 20 is 25 to 65 mm, preferably 25 to 55 mm, more preferably 35 to 55 mm or 25 to 35 mm and 55 to 65 mm on one side of the bottom surface, The height to the top of the head is set to a square pyramid shape having a height of 25 to 65 mm, preferably 25 to 55 mm, more preferably 35 to 55 mm, or 25 to 35 mm and 55 to 65 mm.

By setting the size of the metal ingot 20 to be smaller than the conventional range, it is possible to achieve a high filling rate (60 to 80%) when filling the preheating column 2, . ≪ / RTI > Accordingly, it is possible to improve the heat-generating efficiency and reduce the unit of the fuel source.

If the length of one side of the bottom surface of the quadrangular pyramid-shaped metal ingot 20 is less than 25 mm, the filling rate becomes excessively high. On the other hand, if the length exceeds 65 mm, the filling rate becomes too low.

The weight of the metal ingot 20 is preferably 80 to 140 g /.

It is possible to supply the metal ingot 20 as much as the used molten metal 5 by setting the weight of the metal ingot 20 to the range of the electric steel. That is, the amount (supply) of the metal mass 20 to the preheating column 2 can be adjusted. Therefore, it is possible to prevent the temperature in the preheating column 2 from lowering, and the metal ingot 20 is dissolved efficiently.

On the other hand, when it is large as in the case of the conventional metal ingot 20 (control example to be described later), more metal ingots 20 than the metal ingot 20 corresponding to the amount of the molten metal 5 used are supplied to the preheat tower 2 There is a concern. Then, the temperature in the preheating column 2 is lowered, and the metal packed bodies S are not preheated sufficiently, and it becomes difficult to stably obtain the molten metal 5.

Further, when the metal ingot 20 is formed into a quadrangular pyramid shape having an electric size and weight, for example, the metal structure can be made finer than the conventional one (the 5 kg aluminum ingot of the comparative example), and the mechanical properties ) Can be improved.

Further, when the large metal mass 20 is put into the preheating column 2 as in the control example described later, there is a fear that the inner wall of the preheating column 2 is damaged. However, by using the small-sized metal block 20 as an electric power source, it is possible to reduce an impact upon the introduction into the preheat column 2, thereby preventing damage to the inner wall. Therefore, the operating life of the preheating tower 2 can be extended.

The material of the metal ingot 20 is not particularly limited and may be any of iron and non-ferrous metals, but it is made of the same material. In the present invention, aluminum which can be used as a raw material for various metal products is preferable.

The molten metal in the preheating column 2 becomes a molten metal 5 and flows into the molten metal circulation section 10 along the inclined surface. The molten metal 5 passing through the molten metal circulation section 10 flows into the molten metal retaining chamber 3 and is temporarily stored. The molten metal 5 is stored in the molten metal retaining chamber 3 while the temperature is controlled so as not to solidify until it is conveyed to the next step.

The productivity of the molten metal can be improved by using the dissolution method of the metal ingot and the metal ingot.

Example

Hereinafter, the effect of the present invention will be clarified by showing examples of the metal ingot melting furnace and the metal ingot according to the present invention. However, the present invention is not limited to the following examples.

(Example 1)

As a metal melting furnace, a 1.2-ton Homel furnace with a dissolution amount of 200 kg per unit time was used, and a metal ingot (35 mm long, 25 mm long, 30 mm high) The dissolution test of the metal sulphide was carried out. The amount of test material used was 502 kg. According to the present invention, the total amount of heat required to dissolve the metal ingot was 1,513,944 pounds / ton, and in the case of the conventional metal plant, 1,798,333 pounds / ton, achieving a fuel saving of 15.8%.

(Example 2)

As a metal melting furnace, a 1.5-tonne mortar with a dissolving amount of 350 kg per unit time was used and the metal ingot according to the present invention (35 mm square of bottom side, 25 mm square side, 30 mm height) A dissolution test was conducted. The amount of test material used was 450 kg. According to the present invention, the total amount of heat required to dissolve the metal ingot is 627,000 liters / ton, and in the case of conventional metal ingots, it is 850,000 liters / ton, achieving a fuel saving of 26.2%.

(Example 3)

As a metal melting furnace, a 2.5-tonne homolyte having a dissolving amount of 500 kg per unit time was used and the metal ingot according to the present invention (35 mm square of bottom side, 25 mm square side, 30 mm height) A dissolution test was conducted. The amount of test material used was 1,000 kg. Fuel gas consumption required for dissolution of the metal bars according to the present invention is for a 25.86m ^3, the conventional metal stand is 85.00m ^3, it was possible fuel savings of 30.4% is achieved. In the present embodiment, the greater the scale of the furnace, the higher the energy saving effect tends to be.

(Example 4)

In the metal melting furnace shown in Fig. 1, a metal ingot (aluminum) in the shape of a square horn was charged into a melting furnace and filled and heated and melted. The size of the metal ingot was 25 mm in length and 25 mm in height from the center of the bottom to the peak of the head. The specific surface area of the metal ingot is 650 cm ² / kg, and the filling rate of the melting furnace is 80%.

Tests were conducted in dissolving furnace 1 and melting furnace 2, each having a different volume.

(Example 5)

The test was carried out under the same conditions as in Example 4, except that the length of the bottom side was 35 mm and the height from the center of the bottom to the top of the head was 35 mm. The specific surface area of the metal ingot is 615 cm ² / kg, and the filling rate of the melting furnace is 70%.

(Example 6)

The test was carried out under the same conditions as in Example 4, except that the length of the bottom side was 39 mm and the height from the center of the bottom to the top of the head was 39 mm. The specific surface area of the metal ingot is 600 cm ² / kg, and the filling rate of the melting furnace is 68%.

(Example 7)

The test was carried out under the same conditions as in Example 4, except that the length of the bottom side was 55 mm and the height from the center of the bottom to the peak of the head was 55 mm. The specific surface area of the metal ingot is 540 cm ² / kg, and the filling rate of the melting furnace is 63%.

(Example 8)

The test was carried out in the same manner as in Example 4, except that the length of the bottom side was 65 mm and the height from the center of the bottom to the top of the head was 65 mm. The specific surface area of the metal ingot is 500 cm ² / kg, and the filling rate of the melting furnace is 60%.

(Comparative Example)

As a comparative example, heating and melting were performed using a metal ingot (aluminum) having a shape of quadrangular pyramid shape (specific surface area: 445 cm ² / kg). All of the charged metal blocks had the same shape. The filling rate of the melting furnace is 49%.

As the metal dissolution maintenance furnace, the same components as those of Examples 4 to 8 were used, and the tests were conducted in the melting furnaces 3 to 5 having different volumes.

(Control Example)

As a control, heating and dissolution were carried out by using a conventional metal ingot (5 kg aluminum ingot) having a substantially rectangular parallelepiped shape (specific surface area of 383 cm ² / kg). All of the charged metal blocks had the same shape. The filling rate of the melting furnace is 40%.

Tests were conducted on the melting furnaces 1 to 5 corresponding to the melting furnaces of the examples and the comparative examples, respectively, using the same constituents as those of the examples and comparative examples as the metal melting furnace.

Fuel consumption and carbon dioxide emissions were measured in each of Examples, Comparative Examples and Controls. Further, the unit of the fuel source and the heat generation efficiency were calculated based on the fuel consumption. In addition, the degree of improvement (improvement effect ratio) was calculated for the fuel source unit and the heat exchange efficiency as compared with the control example. The results are shown in Tables 1 to 3.

Table 1 shows the results of the improvement efficiency rates for the fuel source units and the control examples of Examples 4 to 8.

In addition, the improvement effect ratio indicates the ratio of the control sample to the control sample to the difference between the control sample and the control sample as a percentage.

Example 4 (m ³ / t) Control (m ³ / t) Control Example - Example (m ³ / t) Improvement rate (%) Melting furnace 1 42.50 83.72 41.22 49.2 Melting furnace 2 29.55 37.00 7.45 20.1 Example 5 (m ³ / t) Control (m ³ / t) Control Example - Example (m ³ / t) Improvement rate (%) Melting furnace 1 37.62 83.72 46.10 55.1 Melting furnace 2 26.10 37.00 10.90 29.5 Example 6 (m ³ / t) Control (m ³ / t) Control Example - Example (m ³ / t) Improvement rate (%) Melting furnace 1 34.74 83.72 48.98 58.5 Melting furnace 2 25.50 37.00 11.50 31.1 Example 7 (m ³ / t) Control (m ³ / t) Control Example - Example (m ³ / t) Improvement rate (%) Melting furnace 1 39.97 83.72 43.75 52.3 Melting furnace 2 26.93 37.00 10.07 27.2 Example 8 (m ³ / t) Control (m ³ / t) Control Example - Example (m ³ / t) Improvement rate (%) Melting furnace 1 43.88 83.72 34.84 41.6 Melting furnace 2 30.08 37.00 6.92 18.7 Comparative Example (m ³ / t) Control (m ³ / t) Control Example - Comparative Example (m ³ / t) Improvement rate (%) Melting furnace 3 39.22 44.99 5.77 12.8 Melting furnace 4 38.79 46.01 7.22 15.7 Melting furnace 5 33.70 38.10 4.40 11.6

From Table 1, it can be seen that the fuel source unit can be reduced compared to the comparison example in which the filling rate is 49% and the comparison example in which the filling rate is 60% to 80%. It has been confirmed that by increasing the filling rate of the metal ingot, the unit of the fuel source can be reduced.

Therefore, by increasing the filling rate as in the embodiment, the fuel consumption can be greatly reduced.

In Table 1, it can be seen that the fuel source unit is smaller in the embodiment using the square metal pyramid than in the control example using the conventional metal ingot. On the other hand, in the comparative example using the metal pyramid having a quadrangular pyramid shape, it can be seen that the fuel unit is smaller than the control example.

Comparing the improvement effects of the examples and the comparative example, it was confirmed that the improvement effect of the embodiment is remarkable and the fuel source unit can be greatly reduced.

Table 2 shows the heat transfer efficiency and the improvement effect ratio for the control example.

The improvement effect ratio is a difference between the control example and the example or the comparative example.

Example 4 (%) Control (%) Improvement rate (%) Melting furnace 1 67.7 31.3 36.4 Melting furnace 2 94.2 70.7 23.5 Example 5 (%) Control (%) Improvement rate (%) Melting furnace 1 73.8 31.3 42.5 Melting furnace 2 99.1 70.7 28.4 Example 6 (%) Control (%) Improvement rate (%) Melting furnace 1 75.3 31.3 44.0 Melting furnace 2 102.6 70.7 31.9 Example 7 (%) Control (%) Improvement rate (%) Melting furnace 1 71.8 31.3 40.5 Melting furnace 2 98.0 70.7 27.3 Example 8 (%) Control (%) Improvement rate (%) Melting furnace 1 64.0 31.3 32.7 Melting furnace 2 90.9 70.7 20.2 Comparative Example (%) Control (%) Improvement rate (%) Melting furnace 3 66.7 58.1 8.6 Melting furnace 4 67.4 56.9 10.5 Melting furnace 5 77.7 68.7 9.0

From Table 2, it can be seen that the filling efficiency is improved in comparison with the comparative example in which the filling rate is 49% and the comparison example in which the filling rate is 60% to 80%. Therefore, the filling efficiency of the metal ingot can be improved by increasing the filling rate.

In Table 2, it can be seen that the rhefficiency of the embodiment is higher than that of the control example. On the other hand, it can be seen that the burning efficiency of the comparative example is higher than that of the control example.

Comparing the improvement effects of the examples and the comparative example, it was confirmed that the improvement effect of the embodiment was remarkable and the heat-generating efficiency was greatly improved.

Table 3 shows the carbon dioxide emissions. In addition, the amount of carbon dioxide reduction and the reduction rate were calculated based on the carbon dioxide emissions.

Example 4 (kg-CO ₂ / t) Control (kg-CO ₂ / t) Reduction amount (/ month t-CO ₂ ) Reduction rate (%) Melting furnace 1 81.9 174.1 92.2 53.0 Melting furnace 2 58.1 77.0 18.9 24.5 Example 5 (kg-CO ₂ / t) Control (kg-CO ₂ / t) Reduction amount (/ month t-CO ₂ ) Reduction rate (%) Melting furnace 1 74.8 174.1 99.3 57.0 Melting furnace 2 55.5 77.0 21.5 27.9 Example 6 (kg-CO ₂ / t) Control (kg-CO ₂ / t) Reduction amount (/ month t-CO ₂ ) Reduction rate (%) Melting furnace 1 72.3 174.1 101.8 58.5 Melting furnace 2 53.0 77.0 24.0 31.1 Example 7 (kg-CO ₂ / t) Control (kg-CO ₂ / t) Reduction amount (/ month t-CO ₂ ) Reduction rate (%) Melting furnace 1 76.3 174.1 97.8 56.2 Melting furnace 2 56.5 77.0 20.5 26.6 Example 8 (kg-CO ₂ / t) Control (kg-CO ₂ / t) Reduction amount (/ month t-CO ₂ ) Reduction rate (%) Melting furnace 1 83.5 174.1 90.6 52.0 Melting furnace 2 59.9 77.0 17.1 22.2 Comparative Example (kg-CO ₂ / t) Control (kg-CO ₂ / t) Reduction amount (/ month t-CO ₂ ) Reduction rate (%) Melting furnace 3 81.6 93.6 12.0 12.8 Melting furnace 4 80.7 95.7 15.0 15.7 Melting furnace 5 70.1 79.2 9.1 11.6

From Table 3, it can be seen that the carbon dioxide emission amount is lower than that in the case where the filling rate is low (the comparison example and the control example) in the case of the high filling ratio.

In Table 3, it can be seen that the carbon dioxide emission amount of the example is lower than that of the control example. In the comparative example, it can be seen that the carbon dioxide emission amount is lower than that of the control example.

In both the examples and the comparative examples, the carbon dioxide emissions are reduced compared to the control.

Here, comparing the reduction amounts of the monthly carbon dioxide emissions of the examples and the comparative example, the comparative example is 10 / month t-CO ₂ , whereas the embodiment is 100 / month t-CO ₂ .

As described above, it was confirmed that the embodiment can reduce the carbon dioxide emission amount largely as compared with the comparative example.

Here, the heat storage of Example 4, Comparative Example and Control Example is shown in Figs.

FIG. 7 shows the result of calculation of the fourth embodiment, FIG. 8 shows the comparison example, and FIG.

In Example 4, most (85.5%) of the thermal energy is used for melting the metal ingot at 100% total heat input. On the contrary, it can be seen that the heat energy of 54.5% and 66.5% is used in the comparative example and the control example, respectively.

In addition, it can be seen that the heat energy generated when the exhaust gas sensible heat, that is, the metal ingot is dissolved, is the smallest in the embodiment. As a result, it has been confirmed that the thermal energy generated by the dissolution of the metal ingot is effectively used for dissolving the metal ingot by increasing the filling rate and making the metal ingot shape square-horn.

The method of dissolving the metal ingot according to the present invention and the metal ingot can be suitably used in a manufacturing process of a metal product such as an ingot made of aluminum or the like.

1 Metal melting furnace
2 Preheating tower
3 melt reservoir
5 melt
6 Fusion burner
10 Melting section
20 Metals

Claims (15)

A melting furnace disposed below the preheating tower for heating and melting the metal ingot; a molten metal flow portion through which the molten metal flows; and a molten metal flow passage through which the molten metal passes through the molten metal flow portion, A molten metal retaining furnace composed of a molten metal retaining portion to be temporarily stored;
A metal melting furnace having a metal ingot packed and laminated in the preheat column,
The length of one side of the bottom surface is 25 mm and the height from the bottom surface to the top of the head is 25 mm or the length of one side of the bottom surface is 65 mm and the height from the bottom surface to the top of the head is 65 mm,
Wherein the metal ingot is sequentially melted from the bottom of the metal ingot by the melting burner and is packed and stacked so that the hot air rises through the gap of the metal ingot. The method according to claim 1,
Wherein a filling rate of the metal ingot is 60 to 80% of a maximum volume capable of filling the metal ingot in the preheat tower. 3. The method of claim 2,
Wherein the filling rate is 60 to 70%. delete delete delete delete delete delete A metal ingot used in a metal melting furnace according to any one of claims 1 to 3. delete delete delete delete delete

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