Combined preheating holding furnace

Abstract

The utility model discloses a combined preheating holding furnace, and belongs to the technical field of holding furnaces. The combined preheating holding furnace comprises a furnace shell, a furnace cover, a furnace lining, an induction coil, a crucible, a preheating chamber and a control system, the furnace lining is located in the furnace shell, the induction coil surrounds the interior of the furnace lining, the space in the furnace lining is a hearth, and a cooling water jacket is arranged around the induction coil; the crucible is arranged in the hearth; the induction coil is connected with a power supply, and a silicon controlled alternating current voltage regulator is arranged between the induction coil and the power supply; the preheating chamber is located on the side face of the hearth, and a heat exchanger is arranged between the preheating chamber and the hearth. The cooling water jacket is arranged around the induction coil, heat generated by the induction coil is effectively dissipated, energy loss is reduced, the cooling water jacket is further connected with the preheating chamber and can be used for heat energy recycling, and the energy efficiency of the heat preservation furnace is improved; and the silicon controlled alternating current voltage regulator is used, so that the temperature in the hearth is accurately controlled, and the stability of the smelting process and the casting quality are ensured.

Description

Technical Field

[0001] This utility model belongs to the field of heat preservation furnace technology, specifically relating to a combined preheating and heat preservation furnace. Background Technology

[0002] There are many types of holding furnaces, such as coke furnaces, gas furnaces, resistance furnaces, and induction furnaces. However, resistance heating furnaces are widely used, followed by electric reverberatory furnaces. The advantages of these furnaces are their simple structure, convenient temperature control, and good working conditions. The power of the holding furnace only needs to compensate for the total heat loss. To improve production efficiency or ensure continuous production, large furnace groups are generally equipped with holding furnaces. Raw materials are typically melted in a smelting furnace, and after the chemical composition is adjusted to meet the requirements, the material enters the holding furnace via a converter. The power design of the holding furnace is lower than that of the smelting furnace. As the name suggests, the main function of the holding furnace is to keep the melt at a constant temperature, ensuring that the melt temperature remains within the casting temperature range and guaranteeing the stable operation of continuous or semi-continuous casting production.

[0003] Existing holding furnaces have high heat consumption and loss, and the furnace temperature cannot be precisely controlled, which is detrimental to the stability of the smelting process and the quality of castings. Summary of the Invention

[0004] To address the aforementioned problems, this utility model discloses a combined preheating and holding furnace. By setting a cooling water jacket around the induction coil, the heat generated by the induction coil is effectively dissipated, reducing energy loss. The cooling water jacket is also connected to the preheating chamber and can be used for heat recovery and utilization, improving the energy efficiency of the holding furnace. The use of a thyristor AC voltage regulator enables precise control of the furnace temperature, ensuring the stability of the melting process and the quality of the castings.

[0005] To achieve the above objectives, the specific technical solution of this application is as follows:

[0006] A combined preheating and holding furnace includes a furnace shell, a furnace cover, a furnace lining, an induction coil, a crucible, a preheating chamber, and a control system. The furnace lining is located inside the furnace shell, the induction coil is surrounded inside the furnace lining, the space inside the furnace lining is the furnace chamber, and a cooling water jacket is provided around the induction coil. The crucible is located inside the furnace chamber. The induction coil is connected to a power source, and a thyristor AC voltage regulator is provided between the induction coil and the power source. The preheating chamber is located on the side of the furnace chamber, and a heat exchanger is provided between the preheating chamber and the furnace chamber.

[0007] Based on the above technical features, the preheating chamber further includes an independent chamber separated from the furnace, with a partition made of refractory material inside; the preheating chamber is designed with an airflow guiding structure to promote uniform preheating of air or gas; the connecting pipe between the preheating chamber and the furnace is equipped with valves to regulate airflow and preheating efficiency.

[0008] Based on the above technical features, preferably, a gap is designed between the furnace shell and the furnace lining for heat insulation and expansion compensation; the space between the furnace lining and the induction coil is filled with flexible refractory material to improve sealing and heat preservation.

[0009] Based on the above technical features, preferably, the furnace shell is designed with reinforcing ribs to improve overall rigidity and stability.

[0010] Based on the above technical features, preferably, the bottom of the crucible is provided with a flow guide groove, and the flow guide groove is equipped with a controllable valve for precisely controlling the outflow of molten metal; the crucible wall is designed with a spiral or corrugated structure to increase its heat resistance and mechanical strength.

[0011] Based on the above technical features, the combined preheating and insulation furnace further includes a waste gas treatment system located in the upper part of the furnace chamber, which is used to discharge the waste gas generated during combustion and reduce environmental pollution.

[0012] Compared with the prior art, the beneficial effects of this application are as follows:

[0013] This application effectively dissipates the heat generated by the induction coil by setting a cooling water jacket around the induction coil, thereby reducing energy loss. The cooling water jacket is also connected to the preheating chamber and can be used for heat recovery and utilization, thereby improving the energy efficiency of the holding furnace.

[0014] The use of thyristor AC voltage regulators allows for precise adjustment of the input power of the induction coil, enabling precise control of the temperature inside the furnace, ensuring the stability of the melting process and the quality of the castings;

[0015] The gaps designed between the furnace shell and the furnace lining, as well as the reinforcing ribs on the outside of the furnace shell, improve the overall rigidity and stability of the furnace and extend its service life.

[0016] The furnace lining is made of refractory material partitions, and the space between the furnace lining and the induction coil is filled with flexible refractory material, which enhances the furnace's sealing and insulation properties and improves its refractory performance.

[0017] The spiral or corrugated structure design of the crucible wall increases the crucible's heat resistance and mechanical strength, enabling it to withstand long-term high-temperature melting processes.

[0018] The integrated exhaust gas treatment system effectively discharges and treats the exhaust gas generated in the upper part of the furnace, reducing environmental pollution and meeting the environmental protection requirements of modern industry. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a combined preheating and heat preservation furnace according to the present invention;

[0020] List of identifiers in attached diagrams:

[0021] 1. Furnace shell; 2. Furnace cover; 3. Furnace lining; 4. Induction coil; 5. Crucible; 6. Preheating chamber; 7. Cooling water jacket; 8. Thyristor AC voltage regulator; 9. Heat exchanger; 10. Flexible refractory material; 11. Guide channel; 12. Power supply; 13. Waste gas treatment system. Detailed Implementation

[0022] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] It should be noted that the terms "upper," "lower," "left," "right," "front," and "rear" used in the following description refer to the directions shown in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. Furthermore, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] like Figure 1 As shown, a combined preheating and holding furnace includes a furnace shell 1, a furnace cover 2, a furnace lining 3, an induction coil 4, a crucible 5, a preheating chamber 6, and a control system. The furnace lining 3 is located inside the furnace shell 1, and the furnace cover 2 is located on top of the furnace shell 1, used to seal the furnace shell and retain heat. The induction coil 4 surrounds the inside of the furnace lining 3 and is used to generate an alternating magnetic field to heat the metal inside the furnace. The space inside the furnace lining 4 is the furnace chamber, and a cooling water jacket 7 is provided around the induction coil 4; the crucible 5 is inside the furnace chamber and is used to hold the molten metal. The induction coil 4 is connected to a power supply 12, and a silicon controlled rectifier (SCR) AC voltage regulator 8 is provided between the induction coil 4 and the power supply 12 to adjust the input power and control the melting temperature. The preheating chamber 6 is located on the side of the furnace chamber, and a heat exchanger 9 is provided between the preheating chamber 6 and the furnace chamber.

[0025] Furthermore, the preheating chamber 6 has an independent chamber separated from the furnace, and is equipped with a partition made of refractory material inside; the preheating chamber is designed with an airflow guiding structure to promote uniform preheating of air or gas; the connecting pipe between the preheating chamber and the furnace is equipped with valves to regulate airflow and preheating efficiency.

[0026] Preferably, a gap is designed between the furnace shell 1 and the furnace lining 3 for heat insulation and expansion compensation; a flexible refractory material 10 is used to fill the space between the furnace lining 2 and the induction coil 4 to improve sealing and heat preservation.

[0027] Preferably, the furnace shell 1 is designed with reinforcing ribs on the outside to improve overall rigidity and stability, prevent deformation, and extend service life.

[0028] Preferably, the bottom of the crucible is provided with a flow guide groove 11, and the flow guide groove is equipped with a controllable valve for precisely controlling the outflow of molten metal; the crucible wall is designed with a spiral or corrugated structure to increase its heat resistance and mechanical strength.

[0029] Furthermore, the combined preheating and insulation furnace also includes a waste gas treatment system 13, which is located in the upper part of the furnace and is used to discharge the waste gas generated during combustion, thereby reducing environmental pollution.

[0030] Working principle:

[0031] During operation, the input power of the induction coil 4, connected to the power supply 12, is first adjusted by the thyristor AC voltage regulator 8. The induction coil 4 generates an alternating magnetic field, which in turn heats the crucible 5 inside the furnace chamber, melting the metal inside. The crucible 5 is placed inside the furnace chamber, which is composed of the furnace lining 3 and the furnace shell 1. The gap between the furnace lining 3 and the furnace shell 1, as well as the flexible refractory material 10 filling the space between the furnace lining 3 and the induction coil 4, together provide good heat insulation and expansion compensation, ensuring the furnace's sealing and heat preservation. At the same time, the reinforcing ribs on the outside of the furnace shell 1 enhance the structural stability and rigidity of the furnace, extending its service life.

[0032] The heat generated during the smelting process is partially dissipated through the cooling water jacket 7 surrounding the induction coil 4, maintaining the temperature of the induction coil 4 and improving energy efficiency. The preheating chamber 6, as an independent chamber separated from the furnace, is designed with refractory material partitions and airflow guiding structures inside. It exchanges heat with the furnace through the heat exchanger 9, preheating air or gas to improve thermal efficiency. Valves between the preheating chamber 6 and the furnace regulate airflow and preheating efficiency.

[0033] The bottom guide channel 11 of crucible 5 is equipped with a controllable valve to achieve precise control over the outflow of molten metal, while the spiral or corrugated structure design of the crucible wall enhances its heat resistance and mechanical strength. Furthermore, the furnace is equipped with a waste gas treatment system 13 located in the upper part of the furnace chamber, responsible for discharging waste gases generated during the smelting process, reducing environmental pollution and ensuring the environmental friendliness of industrial production. The entire system is centrally managed by a control system, achieving automated operation and improving production efficiency and safety.

[0034] It should be noted that the accompanying drawings merely illustrate the technical concept of the present invention and should not be used to limit the scope of protection of the present invention. For those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and all such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A combined preheating and heat preservation furnace, characterized in that: The furnace includes a furnace shell, furnace cover, furnace lining, induction coil, crucible, preheating chamber, and control system. The furnace lining is located inside the furnace shell, the induction coil is surrounded inside the furnace lining, the space inside the furnace lining is the furnace chamber, and a cooling water jacket is provided around the induction coil. The crucible is located inside the furnace chamber. The induction coil is connected to a power source, and a thyristor AC voltage regulator is provided between the induction coil and the power source. The preheating chamber is located on the side of the furnace chamber, and a heat exchanger is provided between the preheating chamber and the furnace chamber.

2. The combined preheating and heat preservation furnace according to claim 1, characterized in that: The preheating chamber has an independent chamber separated from the furnace and is equipped with a partition made of refractory material inside; the preheating chamber is designed with an airflow guiding structure to promote uniform preheating of air or gas; the connecting pipe between the preheating chamber and the furnace is equipped with a valve.

3. The combined preheating and heat preservation furnace according to claim 1, characterized in that: A gap is designed between the furnace shell and the furnace lining for heat insulation and expansion compensation; the space between the furnace lining and the induction coil is filled with flexible refractory material.

4. A combined preheating and heat preservation furnace according to claim 1, characterized in that: The furnace shell is designed with reinforcing ribs on the outside.

5. A combined preheating and heat preservation furnace according to claim 1, characterized in that: The crucible is provided with a flow guide groove at the bottom, and the flow guide groove is equipped with a controllable valve; the crucible wall is designed with a spiral or corrugated structure.

6. A combined preheating and heat preservation furnace according to claim 1, characterized in that: The combined preheating and insulation furnace also includes a waste gas treatment system, which is located in the upper part of the furnace chamber.

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