A melting furnace bottom heating device

Abstract

The application provides a melting furnace bottom heating device, which comprises a refractory base installed on the bottom of the furnace, a first conductive groove and a second conductive groove are arranged on the top of the refractory base in a coiled manner, and main electrodes are connected to the two ends of the first conductive groove and the second conductive groove, and one end of the main electrode is located in the first conductive groove or the second conductive groove. When the furnace is cold, the main electrode is electrified, so that the input power is increased, the melting furnace is rapidly heated, and the metal in the molten material in the melting furnace can also be prevented from excessively accumulating on a single electrode, the refractory base is prevented from being melted due to excessive heat at the main electrode, the metal liquid formed in the melting process flows into the conductive groove and is electrified in contact with the main electrode, so that the conductive heating area is increased, the heating efficiency is improved, and the energy consumption cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of melting furnace manufacturing technology, and in particular to a melting furnace bottom heating device. Background Technology

[0002] Currently, the treatment of industrial hazardous waste is generally based on incineration and volume reduction, using a melting furnace. The byproducts of incinerating industrial hazardous waste in a melting furnace include ash, a large amount of heavy metals, and dioxins. While dioxins can decompose at high temperatures, the ash remains hazardous waste. This is because during the process of melting the ash into a glassy phase, heavy metals are solidified in the glass phase, making it difficult for them to leach out. To address the problem of heavy metals being solidified in the glassy ash, current treatment methods employ glass smelting techniques. However, the heating devices at the bottom of the melting furnace used in industrial hazardous waste treatment typically use molybdenum electrodes. Molybdenum electrodes are expensive, and during heating, the surface of the molybdenum electrode easily accumulates metals from the molten slag, forming alloys. The heat transfer of the glassy phase at high temperatures is uneven, affecting the heat transfer of the molybdenum electrode and causing excessive heat accumulation at the molybdenum electrode, which can melt the refractory material near the molybdenum electrode. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this invention is to provide a furnace bottom heating device for a melting furnace that is low in cost, can rapidly heat up in cold furnace conditions, improves heating efficiency, and is less likely to melt and destroy refractory materials.

[0004] The present invention achieves the above-mentioned objective as follows: The present invention provides a furnace bottom heating device for a melting furnace, comprising a refractory base installed at the furnace bottom, wherein a first conductive groove and a second conductive groove are coiled and arranged on the top of the refractory base, and a main electrode is connected to both ends of the first conductive groove and the second conductive groove, wherein one end of the main electrode is located in the first conductive groove or the second conductive groove.

[0005] Furthermore, the refractory base has a molten metal collection tank inside, and the side walls of the first conductive groove and the second conductive groove are connected to a low-level molten metal recovery channel, which is connected to the molten metal collection tank.

[0006] Furthermore, it also includes an upper sub-electrode, a middle sub-electrode, and a bottom sub-electrode mounted on the refractory base. One end of the bottom sub-electrode is located in the first conductive groove, one end of the upper sub-electrode and the middle sub-electrode are located in the second conductive groove, and the other end of the bottom sub-electrode is connected to a terminal, and the other terminal is connected to the other end of the upper sub-electrode or the middle sub-electrode.

[0007] Furthermore, the refractory base is covered with an insulation layer and a steel shell.

[0008] Furthermore, the main electrode, the upper auxiliary electrode, the middle auxiliary electrode, and the bottom auxiliary electrode are all fitted with cooling water jackets, and the main electrode, the upper auxiliary electrode, the middle auxiliary electrode, and the bottom auxiliary electrode are also engraved with mating threads that are compatible with the refractory base.

[0009] Furthermore, the main electrode, the upper secondary electrode, the middle secondary electrode, and the bottom secondary electrode are made of iron or copper, and the refractory base is made of high-chromium brick.

[0010] The beneficial effects of this invention are as follows: This invention provides a furnace bottom heating device for a melting furnace. A refractory base is installed at the furnace bottom, and a first conductive groove and a second conductive groove are coiled around the refractory base. Main electrodes are installed at both ends of the first and second conductive grooves. The main electrodes pass through the refractory base and are connected to an electrical device. When the furnace is cold, electricity is supplied to the main electrodes in the first and second conductive grooves, thereby increasing the input power and rapidly heating the melting furnace. Furthermore, this invention prevents excessive metal accumulation in the molten material on a single electrode, preventing excessive heat near the main electrode from melting the refractory base. Additionally, the molten metal formed during the melting process flows into the first and second conductive grooves and contacts the main electrodes, thereby increasing the conductive heating area, improving heating efficiency, and reducing energy costs. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0012] Figure 1 This is a top view schematic diagram of the structure of a furnace bottom heating device in one embodiment of the present invention;

[0013] Figure 2 This is a schematic diagram of the external structure of a melting furnace equipped with a furnace bottom heating device in one embodiment of the present invention;

[0014] Figure 3 This is a three-dimensional schematic diagram of the connection between the conductive groove and the electrode in one embodiment of the present invention;

[0015] Figure 4 for Figure 3 An enlarged diagram of A in the diagram.

[0016] In the figure, 1 is the refractory base, 2 is the first conductive groove, 3 is the second conductive groove, 4 is the main electrode, 5 is the molten metal collection tank, 6 is the low-level molten metal return channel, 7 is the upper auxiliary electrode, 8 is the middle auxiliary electrode, and 9 is the bottom auxiliary electrode. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are only used to explain this invention and are not intended to limit this invention.

[0018] Figures 1-4 The present invention illustrates the structure of a furnace bottom heating device in an embodiment of the present invention. The heating device specifically includes a refractory base 1 installed at the furnace bottom, a first conductive groove 2 and a second conductive groove 3 coiled around the top of the refractory base 1, and a main electrode 4 connected to both ends of the first conductive groove 2 and the second conductive groove 3. One end of the main electrode 4 is located in the first conductive groove 2 or the second conductive groove 3.

[0019] The first conductive groove 2 can be used as an anode conductive groove or a cathode conductive groove, and the second conductive groove 3 can be used as an anode conductive groove or a cathode conductive groove. One of the conductive grooves can be selected as an anode conductive groove and the other as a cathode conductive groove as needed. No restrictions are made here.

[0020] Furthermore, the main electrodes 4 in the first conductive groove 2 and the second conductive groove 3 can be used individually. When one of the main electrodes 4 is used individually, it is equivalent to a heating wire. When one of the main electrodes 4 in the first conductive groove 2 and the second conductive groove 3 is energized, the conductive flow between the molten metal in the first conductive groove 2 and the second conductive groove 3, the energized main electrode 4, and the conductive material in the molten material inside the furnace body is the same as that in a series circuit.

[0021] When the furnace is cold, energize one of the main electrodes 4 in each of the first conductive groove 2 and the second conductive groove 3, so that the main electrode 4 works as a heating wire, and quickly raises the temperature of the cold furnace to a certain level. Then, energize the remaining main electrodes 4 to increase the input power. Compared with heating with only one electrode as the anode electrode and one electrode as the cathode electrode, using multiple main electrodes 4 as anode electrodes and multiple main electrodes 4 as cathode electrodes and energizing them can increase the input power to generate more heat in a short time. On the other hand, it can also prevent the metal in the molten material in the furnace from being excessively concentrated on a single electrode, which would affect the heat transfer. This allows the cold furnace to heat up quickly. At the same time, it can also prevent excessive heat near the main electrode 4 from melting the refractory base 1. Furthermore, the molten metal formed during the melting process sinks and flows into the first conductive groove 2 and the second conductive groove 3 to contact and energize the main electrodes 4, thereby increasing the conductive heating area, improving heating efficiency, and facilitating uniform heating. It can also replenish the molten metal and help maintain the heating effect.

[0022] Furthermore, after a period of use, the electrode characteristics of the terminals connected to the main electrode 4 in the first conductive groove 2 and the second conductive groove 3 can be replaced by changing the electrode characteristics of those terminals.

[0023] Furthermore, such as Figure 1 , Figure 3 as well as Figure 4 As shown, the refractory base 1 has a molten metal collection tank 5 inside. The side walls of the first conductive groove 2 and the second conductive groove 3 are connected to a low-level molten metal recovery channel 6. The low-level molten metal recovery channel 6 is connected to the molten metal collection tank 5. When the liquid level of the molten metal in the first conductive groove 2 and the second conductive groove 3 is higher than the opening of the low-level molten metal recovery channel 6, the molten metal flows into the low-level molten metal recovery channel 6 and is collected in the molten metal collection tank 5, thus preventing the molten metal from overflowing out of the conductive groove and coming into contact with another conductive groove of opposite polarity, causing a short circuit.

[0024] Furthermore, when the amount of molten metal in the first conductive groove 2 and the second conductive groove 3 is large and flows back continuously, if the molten metal recovered by the two conductive grooves comes into direct contact, it can easily cause a short circuit. To avoid this situation, the molten metal collection tank 5 is actually equipped with an anode molten metal collection tank and a cathode molten metal collection tank (not shown in the figure).

[0025] Furthermore, such as Figure 1 and Figure 3 As shown, the heating device also includes an upper auxiliary electrode 7, a middle auxiliary electrode 8, and a bottom auxiliary electrode 9 mounted on the refractory base 1. One end of the bottom auxiliary electrode 9 is located in the first conductive groove 2, and one end of the upper auxiliary electrode 7 and the middle auxiliary electrode 8 are located in the second conductive groove 3. The other end of the bottom auxiliary electrode 9 is connected to a terminal, and the other terminal is connected to the other end of the upper auxiliary electrode 7 or the middle auxiliary electrode 8. After the surface of the upper auxiliary electrode 7, the middle auxiliary electrode 8, and the bottom auxiliary electrode 9 is enriched with metal and melted into molten metal, it flows into the first conductive groove 2 and the second conductive groove 3. The upper auxiliary electrode 7 and the middle auxiliary electrode 8 can be used selectively depending on the situation.

[0026] Furthermore, the refractory base 1 is covered with an insulation layer and a steel shell.

[0027] Furthermore, the main electrode 4, the upper auxiliary electrode 7, the middle auxiliary electrode 8, and the bottom auxiliary electrode 9 are all fitted with cooling water jackets for preventing the molten lava from flowing out. The main electrode 4, the upper auxiliary electrode 7, the middle auxiliary electrode 8, and the bottom auxiliary electrode 9 are also engraved with mating threads that are compatible with the refractory base 1. By engraving the mating threads, it is convenient to install and fix the electrodes, and to push the electrodes into the furnace body so that the electrodes melt or come into contact with the molten material to form liquid metal and flow into the conductive grooves to replenish the first conductive groove 2 and the second conductive groove 3 with liquid metal.

[0028] Furthermore, the main electrode 4, the upper auxiliary electrode 7, the middle auxiliary electrode 8, and the bottom auxiliary electrode 9 can be made of iron or copper, and the refractory base 1 is made of high-chromium brick.

[0029] Preferably, the main electrode 4, the upper auxiliary electrode 7, the middle auxiliary electrode 8, and the bottom auxiliary electrode 9 are connected to the terminals of a low-voltage, high-current power supply below 36V.

[0030] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the claims and scope of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A furnace bottom heating device for a melting furnace, characterized in that: The refractory base (1) installed at the bottom of the furnace is provided with a first conductive groove (2) and a second conductive groove (3) coiled on the top of the refractory base (1). Both ends (3) of the first conductive groove (2) and the second conductive groove are connected to a main electrode (4). One end of the main electrode (4) is located in the first conductive groove (2) or the second conductive groove (3).

2. The furnace bottom heating device for a melting furnace according to claim 1, characterized in that: The refractory base (1) has a metal liquid collection tank (5) inside. The side walls of the first conductive groove (2) and the second conductive groove (3) are connected to a low-level metal liquid recovery channel (6), which is connected to the metal liquid collection tank (5).

3. The furnace bottom heating device according to claim 2, characterized in that: It also includes an upper sub-electrode (7), a middle sub-electrode (8), and a bottom sub-electrode (9) installed on the refractory base (1). One end of the bottom sub-electrode (9) is located in the first conductive groove (2), and one end of the upper sub-electrode (7) and the middle sub-electrode (8) are located in the second conductive groove (3). The other end of the bottom sub-electrode (9) is connected to a terminal, and the other terminal is connected to the other end of the upper sub-electrode (7) or the middle sub-electrode (8).

4. The furnace bottom heating device for a melting furnace according to claim 3, characterized in that: The refractory base (1) is covered with an insulation layer and a steel shell.

5. The furnace bottom heating device according to claim 4, characterized in that: The main electrode (4), the upper auxiliary electrode (7), the middle auxiliary electrode (8), and the bottom auxiliary electrode (9) are all covered with cooling water jackets. The main electrode (4), the upper auxiliary electrode (7), the middle auxiliary electrode (8), and the bottom auxiliary electrode (9) are also engraved with mating threads that are compatible with the refractory base (1).

6. The furnace bottom heating device according to claim 5, characterized in that: The main electrode (4), the upper auxiliary electrode (7), the middle auxiliary electrode (8), and the bottom auxiliary electrode (9) are made of iron or copper, and the refractory base (1) is made of high-chromium brick.

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