Large milky glass electric melting furnace

Abstract

The utility model belongs to the field of milky white glass melting equipment, and particularly relates to a large milky white glass electric melting furnace, which comprises a top inserting electrode and a melting cavity, the top inserting electrode is inserted into the upper end of the melting cavity, and the large milky white glass electric melting furnace is characterized in that a melt flow channel is arranged on one side of the melting cavity and is perpendicular to the horizontal plane; the inlet end of the melt flow channel is located below the liquid outlet end, the bottom of the melting cavity is communicated with an inlet of the melt flow channel through a connecting channel, a slag discharging hole is formed in the junction of the connecting channel and the melt flow channel, and an outlet of the slag discharging hole is formed downwards. According to the electric melting furnace, molten glass at the lower part of the melting cavity can be stably homogenized and clarified, the product quality is obviously improved, the slag discharging hole can be prevented from being blocked, and the slag discharging effect is improved.

Description

Technical Field

[0001] This utility model belongs to the field of milky white glass melting equipment, specifically relating to a large-scale milky white glass electric melting furnace. Background Technology

[0002] Currently, the melting of milky glass products mostly relies on traditional coal-fired or oil-fired kilns. This melting method is extremely wasteful of energy, and in the context of increasingly scarce energy resources, these kilns face a severe problem of fuel scarcity. Moreover, coal and oil, as fuels, cause serious pollution. On the other hand, coal-fired and oil-fired furnaces have a relatively short service life.

[0003] Patent No. 201020599389.3 discloses an electric melting furnace for milky white glass. The bottom of the melting zone of this furnace adopts a circumferentially inclined structure towards the center, with a slag discharge hole at the center of the bottom of the melting zone to discharge waste slag from the furnace. Although the lifespan and pollution levels of the electric melting furnace can be improved, this furnace exhibits significant shortcomings in practical applications, primarily in slag discharge and clarification. The circumferentially inclined bottom causes a large amount of molten glass and waste slag to flow together into the smaller slag discharge area at the bottom, easily clogging the slag discharge hole and making slag discharge difficult. Furthermore, the circumferentially inclined bottom results in a fast flow rate of the molten glass, easily generating turbulence, which is not conducive to the accumulation and discharge of bubbles in the molten glass, affecting product quality.

[0004] Therefore, developing a large-scale milky white glass electric melting furnace that produces less pollution, has a longer service life, and can significantly improve product quality and slag removal efficiency has become an urgent problem for the industry. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a large-scale milky white glass electric melting furnace, which can stably homogenize and clarify the molten glass in the lower part of the melting chamber, significantly improving product quality, and also preventing slag discharge hole blockage and improving slag discharge effect.

[0006] The specific technical solution adopted in this utility model is as follows:

[0007] A large-scale electric melting furnace for milky white glass includes a top-inserted electrode and a melting chamber. The top-inserted electrode is inserted into the upper end of the melting chamber. The key feature is that a molten liquid flow channel is provided on one side of the melting chamber. The molten liquid flow channel is arranged perpendicular to the horizontal plane. The inlet end of the molten liquid flow channel is located below the outlet end. The bottom of the melting chamber is connected to the inlet of the molten liquid flow channel via a connecting channel. A slag discharge hole is provided at the junction of the connecting channel and the molten liquid flow channel. The outlet of the slag discharge hole is set downward.

[0008] The cross-sectional area of ​​the connecting channel is smaller than the cross-sectional area of ​​the molten liquid flow channel.

[0009] The ratio of the cross-sectional area of ​​the connecting channel to the cross-sectional area of ​​the molten flow channel is 1:(1.2~2.5).

[0010] The melting chamber is a stepped cavity with a larger diameter at the top and a smaller diameter at the bottom.

[0011] The height ratio of the large-diameter cavity to the small-diameter cavity of the stepped cavity is (1.5-0.8):1.

[0012] The bottom of the molten flow channel is lower than the bottom of the melting chamber, and the bottom of the connecting channel is set below the bottom of the melting chamber.

[0013] The melting chamber is surrounded by an annular furnace wall, and the outer wall of the annular furnace wall is provided with a furnace wall insulation layer and a refractory layer from the inside to the outside.

[0014] The furnace wall insulation layer 7 includes an upper insulation layer and a lower insulation layer. The upper end of the upper insulation layer is higher than the glass melt surface, and the lower end of the upper insulation layer is 5-15cm lower than the glass melt surface. The upper end of the lower insulation layer is located at 1 / 4 to 1 / 2 of the depth of the melting chamber, and the lower end of the lower insulation layer is lower than or level with the bottom of the melting chamber.

[0015] The electric melting furnace also includes an arched roof, which is supported above the melting chamber by a set of breast walls. The breast walls are spaced apart and form electrode placement ports and feed ports, respectively.

[0016] The top-insertion electrode includes a cooling water jacket, a connecting sleeve, and a molybdenum electrode connected in sequence. The free end of the cooling water jacket is located above the melting chamber and bent downwards. The molybdenum electrode is connected to the free end of the cooling water jacket via the connecting sleeve. The wires of the molybdenum electrode pass through the connecting sleeve and the interior of the cooling water jacket before being connected to an external power source.

[0017] The beneficial effects of this utility model are:

[0018] The melting chamber of this invention is a stepped cavity with a larger diameter at the top and a smaller diameter at the bottom. This effectively blocks the circulation of molten glass, provides a stable environment for the accumulation and rise of bubbles in the molten glass, and helps to expel bubbles. The molten glass in the lower part of the melting chamber can be stably homogenized and clarified, reducing bubbles, ensuring the uniformity of product composition, effectively improving product quality, and preventing the incompletely melted molten glass in the upper part from entering the molten glass flow channel and working pool, ensuring that the fully melted molten glass enters the working pool as required.

[0019] The slag discharge hole is located at the bottom of the molten flow channel. Gravity allows the denser slag to settle naturally to the bottom of the molten flow channel. The flow of the molten liquid flushes the slag discharge hole, reducing the possibility of slag accumulation and blockage near the hole. The slag that has been flushed away settles back to the slag discharge hole due to gravity in the molten flow channel. The slag discharge hole is opened periodically to remove the slag, preventing the molten glass from carrying the slag into the working tank and affecting the material quality.

[0020] A refractory layer was added outside the furnace wall insulation layer, which helps to further extend the service life of the electric melting furnace. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the breast wall structure;

[0023] In the attached diagram, 1 is the top-inserted electrode, 101 is the cooling water jacket, 102 is the connecting sleeve, 103 is the molybdenum electrode, 2 is the melting chamber, 3 is the breast wall, 4 is the arch, 5 is the annular furnace wall, 6 is the molten liquid flow channel, 7 is the furnace wall insulation layer, 701 is the upper part of the insulation, 702 is the lower part of the insulation, 8 is the slag discharge hole, 9 is the liquid outlet end, 10 is the connecting channel, 11 is the electrode placement port, and 12 is the feed port. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0025] Specific embodiments, such as Figure 1 As shown, this utility model relates to a large-scale milky white glass electric melting furnace, including a top-inserted electrode 1 and a melting chamber 2. The top-inserted electrode 1 is inserted into the upper end of the melting chamber 2. Crucially, a molten liquid flow channel 6 is provided on one side of the melting chamber 2, perpendicular to the horizontal plane. The inlet end of the molten liquid flow channel 6 is located below the outlet end 9. The bottom of the melting chamber 2 is connected to the inlet of the molten liquid flow channel 6 via a connecting channel 10. A slag discharge hole 8 is provided at the junction of the connecting channel 10 and the molten liquid flow channel 6, with the outlet of the slag discharge hole 8 facing downwards. Preferably, the slag discharge hole 8 is coaxially arranged with the molten liquid flow channel 6. The inner wall of the melting chamber 2 is made of corundum.

[0026] This electric melting furnace converts electrical energy into heat energy through top-inserted electrodes to melt glass raw materials, without involving the combustion of fuels such as coal and fuel oil, effectively reducing pollution generated during the glass melting process; the use of vertical cold top melting solves the problem of fluorine volatilization pollution generated during the melting of opalescent glass, avoids the problem of high-temperature molten glass in the melting pool corroding refractory materials, and extends the life of the melting furnace.

[0027] As the molten glass at the bottom of the melting chamber 2 flows outward along the molten flow channel 6, it washes over the slag at the bottom of the melting chamber 2, pushing the slag to the bottom of the molten flow channel 6. The slag discharge hole 8 is located at the bottom of the molten flow channel 6. Under the action of gravity, as the molten glass is output upward along the molten flow channel 6, the denser slag in the molten glass naturally settles to the bottom of the molten flow channel 6 and is washed by the flow of the molten glass, reducing the possibility of slag accumulating near the slag discharge hole and causing blockage. The slag that has been washed away settles again in the molten flow channel 6 to the slag discharge hole 8 due to gravity. The slag discharge hole 8 is opened periodically to discharge the slag, preventing the molten glass from carrying the slag to the working pool and affecting the material quality.

[0028] Preferably, the cross-sectional area of ​​the connecting channel 10 is smaller than that of the molten flow channel 6. When the flow rate is constant, the molten glass has a high flow velocity when passing through the connecting channel 10, and the flow velocity of the mixture of molten glass and waste is accelerated. This makes it easier for the molten glass to flush the waste to the inlet end of the molten flow channel 6. The cross-section of the molten flow channel 6 becomes larger, and the flow velocity suddenly decreases. The waste is more likely to sink under the influence of gravity. The difference between the cross-sectional areas of the connecting channel 10 and the molten flow channel 6 allows the molten glass to smoothly flush the waste to the bottom of the molten flow channel 6, reducing the waste content in the melting chamber 2 and preventing the waste from being discharged into the working pool with the molten flow channel 6.

[0029] The ratio of the cross-sectional area of ​​the connecting channel 10 to the cross-sectional area of ​​the molten flow channel 6 is 1:(1.2~2.5). In this embodiment, the ratio of the cross-sectional area of ​​the connecting channel 10 to the cross-sectional area of ​​the molten flow channel 6 is preferably 1:2.

[0030] The melting chamber 2 is a stepped cavity with a larger diameter at the top and a smaller diameter at the bottom. The stepped cavity can effectively block the circulation of molten glass, providing a stable environment for the accumulation and rise of bubbles in the molten glass, which helps to expel bubbles. The molten glass in the lower part of the melting chamber 2 can be stably homogenized and clarified, reducing bubbles, ensuring the uniformity of product composition, effectively improving product quality, and preventing the incompletely melted molten glass in the upper part from entering the molten glass flow channel 6 and the working pool, ensuring that the fully melted molten glass enters the working pool as required.

[0031] The upper part of the melting chamber 2 is a large-diameter cavity, and the lower part is a small-diameter cavity. The height ratio of the large-diameter cavity to the small-diameter cavity is (1.5-0.8):1. In this embodiment, the height ratio of the large-diameter cavity to the small-diameter cavity is preferably 1.2:1.

[0032] The bottom of the molten glass flow channel 6 is lower than the bottom of the melting chamber 2, and the bottom of the connecting channel 10 is set below the bottom of the melting chamber 2. During the outflow of molten glass, the flow of molten glass washes over the bottom of the melting chamber 2, causing the waste residue to sink to the bottom of the connecting channel 10. The connecting channel 10 provides a smooth path for the waste residue in the molten glass to flow into the molten glass flow channel 6, guiding the waste residue to be discharged smoothly, reducing the residue residue in the melting chamber 2, and further improving the slag removal effect. On the other hand, the bottom of the molten glass flow channel 6 is lower than the bottom of the melting chamber 2, which will create a certain liquid level difference in the molten glass flow channel 6, generating an additional pressure difference, providing a certain driving force for slag removal, and helping to discharge the waste residue more quickly.

[0033] The melting chamber 2 is surrounded by an annular furnace wall 5. The outer wall of the annular furnace wall 5 is provided with a furnace wall insulation layer 7 and a refractory layer from the inside to the outside. The refractory layer serves as a second line of heat insulation, further reducing heat loss from the furnace to the outside, helping to maintain a stable furnace temperature, improve energy efficiency, and also providing support for the annular furnace wall 5, enhancing the overall structural strength of the furnace and extending its service life.

[0034] The furnace wall insulation layer 7 includes an upper insulation part 701 and a lower insulation part 702 spaced apart. The upper insulation part 701 and the lower insulation part 702 form a semi-insulation structure for the annular furnace wall 5. The upper end of the upper insulation part 701 is higher than the glass melt surface. Preferably, the upper end of the upper insulation part 701 is level with the top of the melting chamber 2. The lower end of the upper insulation part 701 is set 5-15cm lower than the preset glass melt surface height. The lower end of the lower insulation part 702 is level with the bottom of the melting chamber 2. The upper end of the lower insulation part 702 is set lower than the center position of the melting chamber 2. Preferably, the upper end of the lower insulation part 702 is at 1 / 3 of the depth of the melting chamber 2. The actual liquid level height error caused by feeding, discharging, or temperature fluctuations is mitigated by the lower end of the upper insulation part 701 being 5-15cm lower than the preset glass liquid level height. This ensures that the upper insulation part 701 can still cover the key heat dissipation area when liquid level height errors occur, reducing heat dissipation from the glass liquid surface area and maintaining a stable glass liquid surface temperature. The lower insulation part 702 insulates the bottom of the melting chamber 2 to prevent the glass liquid from becoming too viscous in the low-temperature area and ensure fluidity. There is no insulation between the upper insulation part 701 and the lower insulation part 702, which creates a natural temperature gradient in the middle of the melting chamber 2, promoting heat convection in the glass liquid. This facilitates the removal of bubbles in the glass liquid, thorough mixing of raw materials, and full chemical reaction, improving the clarification and homogenization effect of the glass and enhancing the quality of the glass product.

[0035] The top-inserted electrode 1 includes a cooling water jacket 101, a connecting sleeve 102, and a molybdenum electrode 103 connected in sequence. The free end of the cooling water jacket 101 is located above the melting chamber 2 and bent downwards. The molybdenum electrode 103 is connected to the free end of the cooling water jacket 101 via the connecting sleeve 102. The wires of the molybdenum electrode 103 pass through the connecting sleeve 102 and the interior of the cooling water jacket 101 before being connected to an external power source. The cooling water jacket 101 can cool the molybdenum electrode 103 to prevent it from overheating and being damaged, thus extending its service life. The wires are connected to the molybdenum electrode inside the cooling water jacket 101. The cooling water jacket 101 can also cool the wires to prevent them from being damaged by exposure to high temperatures, thus ensuring the stable operation of the electric furnace.

[0036] like Figure 1 , Figure 2 As shown, the electric melting furnace also includes an arched top 4, which is supported above the melting chamber 2 by ten breast walls 3. The lower end of the breast walls 3 is connected to the upper end of the annular furnace wall 5, and the upper end of the breast walls 3 is connected to the arched top 4. The breast walls 3 are spaced apart and form electrode placement ports 11 and feed ports 12 respectively. The top-inserted electrode 1 is inserted into the upper part of the melting chamber 2 from the electrode placement port 11 side, so that the molybdenum electrode 103 is inserted into the melting chamber 2. Preferably, the included angle between the two sides of the feed port 12 is 100.8°, which is used as an automatic feeding inlet to avoid material quality problems caused by uneven manual feeding, and also to prevent personnel from entering or approaching the high-temperature environment, thus improving the completeness of operation.

Claims

1. A large-sized opal glass electric melting furnace comprising a top inserted electrode (1) and a melting chamber (2), said top inserted electrode (1) being inserted into the upper end of the melting chamber (2), characterized in that: The melting cavity (2) is provided with a molten metal flow channel (6) on one side, the molten metal flow channel (6) is arranged vertically to the horizontal plane, the inlet end of the molten metal flow channel (6) is below the liquid outlet end (9), the bottom of the melting cavity (2) is communicated with the inlet of the molten metal flow channel (6) through a connecting channel (10), the junction of the connecting channel (10) and the molten metal flow channel (6) is provided with a slag discharge hole (8), and the outlet of the slag discharge hole (8) is arranged downward.

2. A large opal glass electric furnace according to claim 1, characterized in that: The cross-sectional area of the connecting channel (10) is smaller than that of the molten metal flow channel (6).

3. A large opal glass electric furnace according to claim 2, characterized in that: The cross-sectional area ratio of the connecting channel (10) to the molten metal flow channel (6) is 1: (1.2-2.5).

4. A large opal glass electric furnace according to claim 1, characterized in that: The melting cavity (2) is a stepped hole cavity with a large diameter on the top and a small diameter on the bottom.

5. A large opal glass electric furnace according to claim 4, characterized in that: The height ratio of the large-diameter cavity part to the small-diameter cavity part of the stepped hole cavity is (1.5-0.8):

1.

6. A large opal glass electric furnace according to claim 1, characterized in that: The bottom of the molten metal flow channel (6) is lower than the cavity bottom of the melting cavity (2), and the bottom of the connecting channel (10) is arranged by sinking from the cavity bottom of the melting cavity (2).

7. A large opal glass electric furnace according to claim 1, characterized in that: The melting cavity (2) is provided with an annular furnace wall (5) around the periphery, and the outer side wall of the annular furnace wall (5) is sequentially provided with a furnace wall heat preservation layer (7) and a refractory layer from inside to outside.

8. A large opal glass electric furnace according to claim 7, characterized in that: The furnace wall heat preservation layer (7) comprises a heat preservation upper part (701) and a heat preservation lower part (702), the upper end of the heat preservation upper part (701) is higher than the glass liquid level, the lower end of the heat preservation upper part (701) is 5-15 cm lower than the glass liquid level, the upper end of the heat preservation lower part (702) is located at 1 / 4-1 / 2 of the depth of the melting cavity (2), and the lower end of the heat preservation lower part (702) is lower than or flush with the bottom of the melting cavity (2).

9. A large opal glass electric furnace according to claim 1, characterized in that: The electric melting furnace further comprises a dome top (4) supported above the melting cavity (2) by a group of breast walls (3), the breast walls (3) are arranged with gaps therebetween and respectively form an electrode placing opening (11) and a feeding opening (12).

10. A large opal glass electric furnace according to claim 1, characterized in that: The top-inserted electrode (1) comprises a cooling water jacket (101), a connecting sleeve (102) and a molybdenum electrode (103) connected in sequence, the free end of the cooling water jacket (101) is located above the melting cavity (2) and is bent downward, the molybdenum electrode (103) is connected with the free end of the cooling water jacket (101) through the connecting sleeve (102), and the electric wire of the molybdenum electrode (103) is connected with an external power source after passing through the inside of the connecting sleeve (102) and the cooling water jacket (101).

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