Casting iron smelting furnace with waste heat recovery function

Abstract

The utility model belongs to smelting furnace technical field especially has the cast iron smelting furnace with the waste heat recovery function, including the furnace body, the upper end of furnace body is provided with the waste heat recovery spare, and the waste heat recovery spare is located in the smoke collecting cover, the upper portion of furnace body is provided with the feed pipe, the feed pipe is inclined 5-15 degrees downward, the heating portion of waste heat recovery spare is located at the pipe wall department of feed pipe, the waste heat recovery spare in the smoke collecting cover can directly absorb the heat in the smoke exhaust of furnace body, and the heat is transferred to the material in the pipe through the heating portion located in the pipe wall of feed pipe. This design makes the cold material be preheated before entering the furnace body, not only reduces the impact on the temperature in the furnace after the material is put in, reduces the energy consumption of the medium frequency induction heating module, but also can accelerate the smelting speed, improves the production efficiency, reaches the purpose of energy saving and consumption reduction.

Description

Technical Field

[0001] This utility model belongs to the field of smelting furnace technology, specifically relating to a cast iron smelting furnace with waste heat recovery function. Background Technology

[0002] In the cast iron smelting industry, the smelting furnace is the core equipment, and its operational stability, energy consumption, and safety directly affect production efficiency and cost.

[0003] Traditional cast iron smelting furnaces have two major problems during use: First, the reliability of the tapping components is insufficient. Because the tapping port is subjected to the impact and erosion of high-temperature molten iron for a long time, the traditional method of fixing with bolts or filling with simple refractory materials is prone to loosening of the tapping components due to thermal expansion and contraction and erosion by molten iron, and even leakage may occur. This not only affects the continuity of production, but also poses a great safety hazard. Second, the utilization rate of waste heat is low. During the smelting process, the flue gas from the furnace carries a lot of heat, which is usually directly discharged into the environment, resulting in energy waste. At the same time, when cold materials are directly put into the high-temperature furnace, they will absorb a lot of heat from the furnace, causing temperature fluctuations in the furnace, increasing heating energy consumption, and prolonging the smelting cycle.

[0004] Therefore, how to improve the installation stability of the liquid outlet components and achieve efficient recovery and utilization of waste heat has become an urgent problem to be solved in the design of cast iron smelting furnaces. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a cast iron smelting furnace with waste heat recovery function. The specific technical solution is as follows:

[0006] A cast iron smelting furnace with waste heat recovery function includes a furnace body, a fume hood installed at the upper end of the furnace body, an inner tank integrally formed inside the furnace body, a flow guide cavity provided between the furnace body and the inner tank, the flow guide cavity being located at the upper part of the inner tank, the lower part of the flow guide cavity being inclined downward, a medium frequency induction heating module for heating the inner tank being provided at the bottom of the furnace body, and a liquid outlet port being provided at the lowest point of the flow guide cavity, the liquid outlet port being located on the outer surface of the furnace body, a liquid outlet component being provided inside the liquid outlet port, a retaining ring integrally formed at one end of the liquid outlet component inserted into the liquid outlet port, a refractory cast-in-place casting for fixing the liquid outlet component being provided inside the liquid outlet port, a waste heat recovery component being provided at the upper end of the furnace body, the waste heat recovery component being located inside the fume hood, a feed pipe being provided at the upper part of the furnace body, the feed pipe being inclined downward at 5-15 degrees, and the heating part of the waste heat recovery component being located at the pipe wall of the feed pipe.

[0007] Preferably, the waste heat recovery component includes a heat exchange plate disposed at the upper end of the furnace body. The heat exchange plate is welded together from several titanium alloy metal sheets arranged in a ring array. A limiting rod is welded to the lower part of the heat exchange plate. A limiting hole is opened at the upper end of the furnace body, and the limiting rod is inserted into the limiting hole. A heat exchange tube is welded into the opening of the heat exchange plate. A heating tube is welded to one end of the heat exchange tube. A circulation pump is installed on the outer surface of the fume hood. The inlet and outlet of the circulation pump are connected to the heat exchange tube and the heating tube, respectively. Hydrogenated terphenyl heat transfer oil is disposed inside both the heat exchange tube and the heating tube.

[0008] Preferably, the heating tube is located on the wall of the feed tube.

[0009] Preferably, the heating tube has a double helix structure.

[0010] Preferably, the upper end of the smoke collection hood is welded with a smoke exhaust pipe.

[0011] Preferably, the end of the liquid outlet has three integrally formed retaining rings.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. Improved reliability of the molten iron outlet: The integrated retaining ring design at the end of the outlet significantly increases the contact area with the cast refractory lining, allowing the refractory lining to more tightly encase the outlet and form a robust overall structure. This fixing method effectively resists the impact of high-temperature molten iron and thermal stress during long-term use, greatly reducing the risk of loosening and leakage of the outlet, extending the service life of the equipment, and improving production safety and continuity.

[0014] 2. Achieving efficient waste heat recovery and utilization: The waste heat recovery unit installed in the fume hood can directly absorb the heat from the furnace exhaust and transfer it to the material inside the pipe through the heating section located on the wall of the feed pipe. This design preheats the cold material before it enters the furnace, which not only reduces the impact on the furnace temperature after the material is added and lowers the energy consumption of the medium-frequency induction heating module, but also accelerates the melting speed, improves production efficiency, and achieves the goal of energy saving and consumption reduction.

[0015] 3. Optimize furnace body flow guidance and liquid discharge efficiency: The lower part of the flow guidance cavity between the furnace body and the inner pot adopts a downward sloping design, and the liquid discharge port is located at the lowest point of the flow guidance cavity. This structure can guide the molten iron to naturally converge and flow out smoothly, reduce the molten iron residue in the furnace, improve the liquid discharge efficiency, and at the same time avoid the overheating or cooling problems caused by the local retention of molten iron in the furnace, thus ensuring the stability of smelting quality.

[0016] 4. Enhanced overall equipment practicality: The downward-sloping feed pipe design facilitates smooth material input and, in conjunction with the waste heat recovery heating unit, forms a continuous "preheating-melting" process. The medium-frequency induction heating module, as the core heating element, works collaboratively with the waste heat recovery system to further improve energy utilization efficiency. The overall structural layout is reasonable, taking into account production efficiency, safety, and energy conservation and environmental protection requirements, and has high practical value. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of a half-section of the present invention;

[0019] Figure 3 This is a schematic diagram of the component structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the waste heat recovery component of this utility model;

[0021] Figure 5 for Figure 2 A magnified structural diagram of point A in the middle.

[0022] Attached reference numerals: 1. Furnace body; 2. Inner tank; 3. Flow guide cavity; 4. Medium frequency induction heating module; 5. Liquid outlet port; 6. Liquid outlet component; 7. Baffle ring; 8. Refractory clay cast-in-place component; 9. Smoke hood; 10. Smoke exhaust pipe; 11. Limiting hole; 12. Heat exchange plate; 13. Limiting rod; 14. Heat exchange tube; 15. Circulating pump; 16. Heating tube; 17. Feed pipe. Detailed Implementation

[0023] The technical solution of this utility model will now be described with reference to the accompanying drawings and embodiments.

[0024] Please see Figure 1-5This embodiment provides the following technical solution: a cast iron smelting furnace with waste heat recovery function, including a furnace body 1, a fume hood 9 installed at the upper end of the furnace body 1, an inner tank 2 integrally formed inside the furnace body 1, a guide cavity 3 provided between the furnace body 1 and the inner tank 2, and the guide cavity 3 is located at the upper part of the inner tank 2, with the lower part of the guide cavity 3 angled downwards, a medium frequency induction heating module 4 for heating the inner tank 2 provided at the bottom of the furnace body 1, and a liquid outlet 5 provided at the lowest point of the guide cavity 3. 5 is set on the outer surface of the furnace body 1. A liquid outlet 6 is set in the liquid outlet inlet 5. One end of the liquid outlet 6 inserted into the liquid outlet inlet 5 is integrally formed with a retaining ring 7. A refractory cast-in-place casting 8 for fixing the liquid outlet 6 is set in the liquid outlet inlet 5. A waste heat recovery component is set at the upper end of the furnace body 1 and is located in the fume hood 9. A feed pipe 17 is set at the upper part of the furnace body 1. The feed pipe 17 is inclined downward at 5-15 degrees. The heating part of the waste heat recovery component is located at the pipe wall of the feed pipe 17.

[0025] In this embodiment, a liquid outlet 6 is fixed to the side surface of the furnace body 1 by a refractory casting 8 through a liquid outlet inlet 5. The retaining ring 7 integrally formed at the end of the liquid outlet 6 increases the contact area with the refractory casting 8 when it is fixed inside the liquid outlet inlet 5, thereby improving the reliability of the liquid outlet 6 in the liquid outlet inlet 5. The waste heat recovery component is located inside the smoke hood 9 at the upper end of the furnace body 1. At the same time, the heating part of the waste heat recovery component is located at the pipe wall of the feed pipe 17, so that the waste heat recovery component can recover the heat of the smoke discharged from the furnace body 1 and heat the feed pipe 17 through the heating component. This makes it easier for the material to be heated when it is put into the inner tank 2 through the feed pipe 17, thus achieving the purpose of material preheating and improving the heat utilization rate.

[0026] Specifically, the waste heat recovery component includes a heat exchange plate 12 installed at the upper end of the furnace body 1. The heat exchange plate 12 is welded together from several titanium alloy metal sheets arranged in a ring array. A limiting rod 13 is welded to the lower part of the heat exchange plate 12. A limiting hole 11 is opened at the upper end of the furnace body 1, and the limiting rod 13 is inserted into the limiting hole 11. A heat exchange tube 14 is welded into the opening of the heat exchange plate 12. A heating tube 16 is welded to one end of the heat exchange tube 14. A circulation pump 15 is installed on the outer surface of the fume hood 9. The liquid inlet of the circulation pump 15 is connected to the heat exchange tube 14, and the liquid outlet of the circulation pump 15 is connected to the heating tube 16. Hydrogenated terphenyl heat transfer oil is installed in both the heat exchange tube 14 and the heating tube 16. The heating tube 16 is located at the wall of the feed pipe 17 and has a double spiral tube structure.

[0027] In this embodiment, a waste heat recovery component is constructed by a heat exchange plate 12, a limiting rod 13, a heat exchange tube 14, a circulating pump 15, and a heating tube 16. The heat exchange plate 12 is welded from several titanium alloy metal sheets arranged in a ring array. This facilitates the heat exchange plate 12 to absorb heat from the flue gas and transfer it to the heat exchange tube 14. This allows the hydrogenated terphenyl heat transfer oil in the heat exchange tube 14 to enter the interior of the heating tube 16 under the action of the circulating pump 15. This facilitates the heating tube 16 to heat the feed pipe 17, thereby achieving the purpose of recovering and reusing waste heat from the flue gas.

[0028] Specifically, a smoke exhaust pipe 10 is welded to the upper end of the smoke hood 9.

[0029] Specifically, the end of the liquid outlet component 6 has three integrally formed retaining rings 7.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cast iron smelting furnace with waste heat recovery function, comprising a furnace body (1), wherein a fume hood (9) is installed at the upper end of the furnace body (1), characterized in that: The furnace body (1) has an integrally formed inner tank (2). A flow guide cavity (3) is provided between the furnace body (1) and the inner tank (2), and the flow guide cavity (3) is located at the upper part of the inner tank (2). The lower part of the flow guide cavity (3) is obliquely downward. A medium-frequency induction heating module (4) for heating the inner tank (2) is provided at the bottom of the furnace body (1), and a liquid outlet (5) is provided at the lowest point of the flow guide cavity (3). The liquid outlet (5) is located on the outer surface of the furnace body (1), and a liquid outlet (5) is provided inside the liquid outlet (5). The liquid outlet component (6) is inserted into the liquid outlet socket (5) and has a retaining ring (7) integrally formed at one end. The liquid outlet socket (5) is provided with a refractory cast-in-place casting (8) for fixing the liquid outlet component (6). The upper end of the furnace body (1) is provided with a waste heat recovery component, which is located inside the smoke hood (9). The upper part of the furnace body (1) is provided with a feed pipe (17), which is inclined downward at 5-15 degrees. The heating part of the waste heat recovery component is located at the pipe wall of the feed pipe (17).

2. The cast iron smelting furnace with waste heat recovery function according to claim 1, characterized in that: The waste heat recovery component includes a heat exchange plate (12) installed at the upper end of the furnace body (1). The heat exchange plate (12) is welded together from several titanium alloy metal sheets arranged in a ring array. A limiting rod (13) is welded to the lower part of the heat exchange plate (12). A limiting hole (11) is opened at the upper end of the furnace body (1), and the limiting rod (13) is inserted into the limiting hole (11). A heat exchange tube (14) is welded into the hole of the heat exchange plate (12). A heating tube (16) is welded to one end of the heat exchange tube (14). A circulating pump (15) is installed on the outer surface of the fume hood (9). The inlet and outlet of the circulating pump (15) are connected to the heat exchange tube (14) and the heating tube (16) respectively. Hydrogenated terphenyl heat transfer oil is installed in both the heat exchange tube (14) and the heating tube (16).

3. The cast iron smelting furnace with waste heat recovery function according to claim 2, characterized in that: The heating tube (16) is located on the wall of the feed tube (17).

4. The cast iron smelting furnace with waste heat recovery function according to claim 3, characterized in that: The heating tube (16) has a double helix structure.

5. The cast iron smelting furnace with waste heat recovery function according to claim 1, characterized in that: The upper end of the smoke collection hood (9) is welded with a smoke exhaust pipe (10).

6. The cast iron smelting furnace with waste heat recovery function according to claim 1, characterized in that: The liquid outlet component (6) has three integrally formed retaining rings (7) at its end.

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