Electric furnace idle heat recycling system

Abstract

The utility model provides an electric furnace idle heat recycling system which comprises an internal circulation power source water pump station, an internal circulation furnace body water pump station, an external circulation water pump station, an open type cooling tower and three heat exchange units. The other end of the open type cooling tower is connected with an outer circulating water pump station, one end of the outer circulating water pump station is connected with the open type cooling tower, the other end of the outer circulating water pump station is connected with the cold inlet end of a second heat exchange unit, the hot outlet end of the second heat exchange unit is connected with one end of an inner circulating power supply water pump station, and the other end of the inner circulating power supply water pump station is connected with a power supply cabinet. The hot inlet end of the second heat exchange unit is connected through the power supply cabinet, the cold outlet end of the second heat exchange unit is connected with the cold inlet end of the first heat exchange unit, the hot outlet end of the first heat exchange unit is connected with the input end of the internal circulation furnace body water pump station, and the output end of the internal circulation furnace body water pump station is connected with the hot inlet end of the first heat exchange unit.

Description

Technical Field

[0001] The utility model belongs to the field of heat circulation, and in particular relates to an idle heat circulation utilization system of an electric furnace. Background Art

[0002] The electric furnace idle heat recycling system is an important technological innovation aimed at improving energy utilization efficiency and reducing production costs. With the global energy crisis and environmental problems becoming increasingly severe, energy conservation and environmental protection in the industrial field have become urgent issues that need to be addressed. As an important equipment in the metallurgical, chemical and other industries, electric furnaces generate a large amount of heat during the production process. If this heat is not utilized, it will not only cause energy waste, but may also have a negative impact on the environment. However, the existing electric furnace heat recovery technology has many shortcomings and limitations. Traditional heat recovery systems often only focus on the recovery and utilization of high-temperature exhaust gases, ignoring the low-grade heat emitted by other parts of the electric furnace, such as the furnace wall and electrodes, resulting in a large amount of heat energy being wasted.

[0003] Existing technologies are deficient in terms of heat recovery efficiency. Many systems are unable to effectively capture and convert heat energy due to unreasonable design or outdated technology, resulting in low recovery rates. Furthermore, existing heat utilization systems generally lack flexibility and adaptability, making it difficult to adjust in real time according to production needs and environmental changes. This leads to large fluctuations in energy utilization efficiency under different operating conditions. In addition, many existing systems experience significant losses during heat conversion and transmission, reducing overall energy utilization efficiency. In terms of system integration, existing technologies often lack holistic considerations, and the coordination between various subsystems is poor, making it difficult to achieve optimal heat distribution and utilization.

[0004] Another significant issue is that existing heat recovery systems are not economically viable, with high initial investment and maintenance costs prohibitive for many companies. At the same time, existing technologies also present safety and reliability risks. Some systems lack stability in high-temperature and high-pressure environments, increasing safety risks in the production process. Furthermore, existing heat recovery systems generally lack intelligence and automation, requiring extensive manual intervention and maintenance, increasing operating costs and management difficulties. Finally, many existing systems exhibit poor environmental adaptability, making it difficult to maintain efficient operation under varying climatic conditions and production environments. These shortcomings and limitations severely restrict the effective utilization of idle heat from electric furnaces, resulting in not only energy waste but also the ability of companies to improve energy efficiency and reduce production costs. Therefore, developing an efficient, flexible, economical, and environmentally friendly system for recycling idle heat from electric furnaces is of great practical significance and economic value. Utility Model Content

[0005] This utility model proposes a system for recycling the idle heat of an electric furnace. This solves the problem of existing inverter melting furnaces and power cabinets using cooling towers to remove heat, which is not environmentally friendly and causes serious energy waste. The purpose of this utility model is to design a new circulation system based on the old cooling circulation system to reuse the idle heat generated by the electric furnace.

[0006] The technical solution of the utility model is achieved as follows: an electric furnace idle heat recycling system, comprising an internal circulation power supply water pump station, an internal circulation furnace body water pump station, an external circulation water pump station, an open cooling tower and three sets of heat exchange units, one end of the open cooling tower is connected to the cold outlet of the first heat exchange unit, the other end of the open cooling tower is connected to the external circulation water pump station, one end of the external circulation water pump station is connected to the open cooling tower, and the other end is connected to the cold inlet end of the second heat exchange unit, the hot outlet end of the second heat exchange unit is connected to one end of the internal circulation power supply water pump station, the other end of the internal circulation power supply water pump station is connected to a power cabinet, and the heat exchange unit is cooled by the electric current. The source cabinet is connected to the hot inlet end of the second heat exchange unit, the cold outlet end of the second heat exchange unit is connected to the cold inlet end of the first heat exchange unit, the hot outlet end of the first heat exchange unit is connected to the input end of the internal circulation furnace water pump station, the output end of the internal circulation furnace water pump station is connected to the hot inlet end of the first heat exchange unit, and a variable frequency melting furnace is arranged on the string line of the output end of the internal circulation furnace water pump station. The hot inlet end and hot outlet end of the third heat exchange unit are simultaneously connected to the string line of the output end of the internal circulation furnace water pump station, the cold inlet end of the third heat exchange unit is connected to one end of the heat exchange equipment, and the other end of the heat exchange equipment is connected to the cold outlet end of the third heat exchange unit.

[0007] The system utilizes a complex structure consisting of three heat exchange units. This multi-stage heat exchange design significantly improves heat recovery efficiency. While traditional systems may only use a single or dual heat exchange structure, this three-stage heat exchange design more fully utilizes heat from different temperature gradients, achieving more efficient energy recovery.

[0008] The system cleverly integrates two water circulation systems: internal and external. This design not only increases heat utilization flexibility but also enhances system stability. The internal circulation system is divided into a power supply water loop and a furnace water loop. This separation allows for precise control of the cooling needs of different components, improving cooling efficiency and overall system performance. The external circulation system ultimately releases heat through an open cooling tower, a design that ensures system efficiency while also taking environmental factors into consideration.

[0009] Another innovation of the system is the installation of a variable-frequency melting furnace connected to the output of the internal-circulation furnace water pump station. This design allows the system to dynamically adjust the operating parameters of the melting furnace based on changes in heat load, achieving precise control of energy utilization, which is difficult to achieve in traditional systems.

[0010] The design of the third heat exchange unit also demonstrates the system's flexibility and scalability. By connecting the third heat exchange unit to the output line of the internal-circulation furnace water pump station, the system can flexibly allocate heat as needed. This design provides an additional heat utilization method and increases the system's adaptability. The introduction of heat exchange equipment further expands the system's application range, allowing the recovered heat to be used in other production processes or for environmental regulation, thereby improving overall energy efficiency.

[0011] This idle heat recycling system for electric furnaces utilizes a complex multi-stage heat exchange design, the integration of internal and external circulating water systems, the application of variable frequency control, and a flexible heat distribution mechanism to create an efficient, flexible, and sustainable heat recovery system. It not only overcomes the limitations of traditional systems in terms of heat recovery efficiency and flexibility, but also provides a new technical path for energy conservation and environmental protection in industrial production. This design reflects the significant trend of industrial heat recovery systems towards high efficiency, high integration, and high adaptability. It has the potential to set a new standard for energy utilization in the electric furnace industry, making a significant contribution to the green and sustainable development of industrial production.

[0012] As a preferred embodiment, the open cooling tower is equipped with a cold water pool and a hot water pool, wherein the cold water pool is connected to the external circulation water pump station, the hot water pool supplies water to the cooling tower through a water supply pump, and the cooling tower is connected to the cold outlet of the first heat exchange unit.

[0013] As a preferred embodiment, a water supply port is provided at the heat outlet end of the first heat exchange unit, a water supply port is provided at the heat outlet end of the second heat exchange unit, and a sewage outlet is provided at the output end of the external circulation water pump station and in the internal circulation furnace water pump station.

[0014] As a preferred embodiment, the variable frequency smelting furnace is arranged on a string line at the output end of the internal circulation furnace water pump station to conduct heat from the variable frequency smelting furnace.

[0015] After adopting the above technical solution, the beneficial effects of the utility model are as follows: through the complex structural design of three groups of heat exchange units, the efficiency of heat recovery is significantly improved, the full utilization of heat with different temperature gradients is achieved, and energy waste is greatly reduced. The integration of the internal circulation and external circulation water systems enhances the stability and flexibility of the system, enabling the system to better adapt to different operating conditions and needs. The internal circulation system is divided into power supply water circulation and furnace water circulation, which realizes the precise regulation of the cooling requirements of different components and improves the cooling efficiency and overall system performance. The external circulation system realizes the final release of heat through an open cooling tower, which takes environmental factors into consideration while ensuring the efficiency of the system.

[0016] The variable frequency melting furnace allows the system to dynamically adjust operating parameters based on changes in heat load, achieving precise control of energy utilization and improving the system's adaptability and energy efficiency. The flexible design of the third heat exchange unit provides additional heat utilization options, increasing the system's adaptability and scalability. The introduction of heat exchange equipment expands the system's application range, allowing recovered heat to be used in other production processes or for environmental regulation, further improving overall energy efficiency.

[0017] This system not only significantly improves the utilization rate of idle heat in electric furnaces, reduces energy consumption and production costs, but also enhances the adaptability and scalability of the system through flexible design, providing strong support for energy conservation, emission reduction and sustainable development of industrial production, but also provides new ideas and directions for technological innovation and upgrading in related industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 This is a system structure diagram of the utility model;

[0020] Figure 2 This is an enlarged diagram of the connection of the open cooling tower circulation system of the utility model;

[0021] Figure 3 This is an enlarged diagram of the connection of the first heat exchange module system of the present utility model;

[0022] Figure 4 This is an enlarged diagram of the connection of the second heat exchange module system of the present invention;

[0023] Figure 5 This is an enlarged diagram of the connection of the third heat exchange module system of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example:

[0026] like Figures 1 to 5 As shown, an electric furnace idle heat recycling system includes an internal circulation power supply water pump station, an internal circulation furnace body water pump station, an external circulation water pump station, an open cooling tower and three sets of heat exchange units, one end of the open cooling tower is connected to the cold outlet of the first heat exchange unit, the other end of the open cooling tower is connected to the external circulation water pump station, one end of the external circulation water pump station is connected to the open cooling tower, and the other end is connected to the cold inlet end of the second heat exchange unit, the hot outlet end of the second heat exchange unit is connected to one end of the internal circulation power supply water pump station, the other end of the internal circulation power supply water pump station is connected to a power cabinet, and the second heat exchange unit is connected to the power cabinet through the power cabinet. The hot inlet end of the heat unit, the cold outlet end of the second heat exchange unit is connected to the cold inlet end of the first heat exchange unit, the hot outlet end of the first heat exchange unit is connected to the input end of the internal circulation furnace water pump station, the output end of the internal circulation furnace water pump station is connected to the hot inlet end of the first heat exchange unit, and a variable frequency melting furnace is arranged on the string line of the output end of the internal circulation furnace water pump station. The hot inlet end and the hot outlet end of the third heat exchange unit are simultaneously connected to the string line of the output end of the internal circulation furnace water pump station, the cold inlet end of the third heat exchange unit is connected to one end of the heat exchange equipment, and the other end of the heat exchange equipment is connected to the cold outlet end of the third heat exchange unit.

[0027] The working principle and operating steps of this electric furnace idle heat recycling system involve multiple cycles and heat exchange processes, and each link is carefully designed to achieve efficient heat recovery and utilization.

[0028] The system achieves heat transfer and utilization through three main loops: an external loop, an internal power supply water loop, and an internal furnace water loop. The external loop, centered around an open cooling tower, uses an external water pump station to deliver cooled water to the cold inlet of the second heat exchange unit, ultimately dissipating heat from the system. The internal power supply water loop primarily cools the power cabinet. The internal power supply water pump station delivers cooling water to the cabinet, where it then undergoes heat exchange through the second heat exchange unit. The internal furnace water loop primarily cools the variable frequency melting furnace. The internal furnace water pump station delivers cooling water to the variable frequency melting furnace, where it then undergoes heat exchange through the first heat exchange unit.

[0029] The system operates as follows: Externally circulating water flows from the open cooling tower, passes through the externally circulating water pump station, and enters the cold inlet of the second heat exchange unit. In the second heat exchange unit, the externally circulating water absorbs heat from the internally circulating power water. The heated externally circulating water returns to the open cooling tower for cooling. Internally circulating power water flows from the power cabinet, carrying heat generated by the cabinet. After passing through the second heat exchange unit, where it transfers heat to the externally circulating water, the cooled internally circulating power water returns to the cabinet via the internally circulating power water pump station. Internally circulating furnace water flows from the variable frequency melting furnace, carrying heat generated by the furnace, and enters the first heat exchange unit. In the first heat exchange unit, the internally circulating furnace water transfers heat to water flowing from the cold outlet of the second heat exchange unit.

[0030] The cooled internal circulation furnace water is returned to the variable frequency melting furnace via the internal circulation furnace water pump station. The third heat exchange unit serves as an additional heat utilization method. It extracts some heat from the internal circulation furnace water circulation and uses this heat for other purposes through heat exchange with the heat exchange equipment.

[0031] The reasons for this setup and operation are as follows: The three-unit design achieves multi-stage heat utilization, maximizing heat recovery efficiency. The second unit first recovers heat from the power cabinet, the first unit recovers high-temperature heat from the furnace, and the third unit flexibly utilizes the remaining heat. This multi-stage utilization ensures that the system can fully recover heat from different temperature gradients.

[0032] The separation of internal and external circulation enhances system stability and flexibility. The external circulation achieves final heat dissipation through an open cooling tower, while the internal circulation is divided into a power supply water loop and a furnace water loop. This separation allows the system to precisely control the cooling needs of different components. The variable frequency melting furnace allows the system to dynamically adjust operating parameters based on changes in heat load, achieving precise control of energy utilization.

[0033] The flexible design of the third heat exchange unit provides the system with additional heat utilization methods, increasing its adaptability and scalability. This design enables the system to flexibly allocate heat according to actual needs, improving overall energy efficiency.

[0034] This system utilizes a complex multi-stage heat exchange design, the integration of internal and external circulating water systems, the application of variable frequency control, and a flexible heat distribution mechanism to create an efficient, flexible, and sustainable heat recovery system. It not only maximizes heat recovery and utilization but also provides multiple heat utilization pathways, offering innovative technical solutions for energy conservation and environmental protection in industrial production.

[0035] The open cooling tower has a built-in cold water pool and a hot water pool, wherein the cold water pool is connected to the external circulation water pump station, and the hot water pool supplies water to the cooling tower through a water supply pump, and the cooling tower is connected to the cold outlet of the first heat exchange unit.

[0036] The integrated design of cold and hot water tanks is a significant improvement. Traditional open cooling towers typically have only one tank, but this separate design allows for more efficient management of water at varying temperatures, improving cooling efficiency. The cold water tank is specifically designed to store cooled water and is directly connected to the external circulating water pump station, ensuring that the water supplied to the system remains at a consistently low temperature, which is crucial for maintaining the cooling effect of the entire system. The hot water tank is specifically designed to collect and manage high-temperature water. This separation prevents hot water from mixing directly with cold water, avoiding direct heat transfer and improving the overall efficiency of the cooling tower.

[0037] The introduction of a water supply pump is another innovation. By using a dedicated water supply pump to supply water to the cooling tower, the system can precisely control the water flow and timing of water supply, making it more flexible and efficient than systems relying on gravity or a single pump. This design allows the system to dynamically adjust water supply based on actual cooling needs and environmental conditions, optimizing cooling efficiency. The direct connection between the cooling tower and the cold outlet of the first heat exchange unit is also a key design feature. This direct connection ensures that freshly cooled water can immediately enter the heat exchange system, maximizing the cooling effect. This design reduces heat loss and improves the energy efficiency of the entire system. Furthermore, this design embodies the system's modular design. The cold water tank, hot water tank, water supply pump, and cooling tower form a self-contained cooling module. This modular design not only facilitates maintenance and management but also improves the system's scalability and adaptability.

[0038] For example, when additional cooling capacity is needed, this module can be expanded or upgraded relatively easily without changing the entire system structure. This open cooling tower design, through innovations such as hot and cold water separation, dedicated water supply pumps, and direct heat exchange connections, creates an efficient, flexible, and easy-to-manage cooling system. It not only addresses the efficiency and control precision limitations of traditional open cooling towers, but also provides more stable and efficient cooling support for the entire heat recycling system. This design reflects the significant trend in industrial cooling systems toward high efficiency, high-precision control, and modularization. It has the potential to become a new standard for large-scale industrial cooling systems, providing strong support for energy conservation, emission reduction, and sustainable development in industrial production.

[0039] The heat outlet of the first heat exchange unit is provided with a water supply port, the heat outlet of the second heat exchange unit is provided with a water supply port, and the output end of the external circulation water pump station and the internal circulation furnace water pump station are provided with sewage outlets.

[0040] The installation of separate water inlets at the heat outlets of the first and second heat exchange units is a significant improvement. While traditional systems may only have a single inlet at a single point in the entire circulation, this distributed water inlet design allows for more precise control of water quantity and quality across different loops. The inlet at the heat outlet of the first heat exchange unit directly replenishes losses in the internal circulation furnace water system, while the inlet at the heat outlet of the second heat exchange unit specifically replenishes losses in the internal circulation power supply water system.

[0041] This design not only improves system flexibility but also better maintains water balance and stable water quality across all loops. Another innovation is the installation of a sewage outlet at the output of the external circulation water pump station. This allows the system to promptly discharge wastewater when water quality deteriorates, preventing the accumulation of impurities in the system, thereby protecting the heat exchange equipment and piping and extending system life. This design is more efficient and timely than traditional, periodic manual sewage removal, and can be dynamically adjusted based on actual water quality conditions. The installation of a sewage outlet within the internal circulation boiler water pump station further strengthens the system's water quality management capabilities.

[0042] The water circulation system within the furnace, due to its direct contact with high-temperature components, is more susceptible to water quality issues such as scaling and corrosion. The installation of a drain outlet here allows for the timely removal of contaminants that could impact system performance, ensuring efficient and safe furnace cooling. This design reflects thorough consideration of the system's long-term stable operation and far exceeds the water quality management capabilities of traditional systems. It also demonstrates the system's comprehensiveness and foresight. By placing water replenishment and drain outlets at key nodes, the system creates a dynamic mechanism for managing water quantity and quality. This not only improves system efficiency and reliability but also provides interfaces for future system upgrades and expansions.

[0043] For example, water quality monitoring equipment or automatic control valves can be added to these water inlets and outfalls to further enhance the system's intelligence. This strategically placed design creates a highly flexible, easy-to-maintain, and forward-looking water circulation management system. It not only addresses the limitations of traditional systems in terms of water balance and water quality management, but also ensures more stable and efficient operation of the entire heat recycling system. This design reflects the significant trend in industrial cooling systems toward refined management, high reliability, and intelligence. It has the potential to become a new standard for large-scale industrial cooling systems, providing strong support for energy conservation, emission reduction, and sustainable development in industrial production.

[0044] The variable frequency smelting furnace is arranged on a string line at the output end of the internal circulation furnace body water pump station to conduct heat out of the variable frequency smelting furnace.

[0045] This tandem design enables direct and efficient heat recovery from the variable frequency melting furnace. Traditional systems may treat the melting furnace as a standalone unit, with the heat generated often being directly discharged or processed through a separate cooling system. This design, however, integrates the melting furnace directly into the internally circulating furnace water system, allowing the heat generated by the furnace to be immediately absorbed by the circulating water, significantly improving the efficiency and speed of heat recovery.

[0046] The placement of the variable frequency melting furnace at the output of the water pumping station was a carefully considered decision. This arrangement ensures the most stable water flow and pressure to the furnace, facilitating uniform cooling of the furnace and efficient heat extraction. Compared to placing the furnace in other locations, this design allows for better control of cooling water flow parameters, resulting in more precise temperature control and heat management. The use of a variable frequency melting furnace is another important innovation. Frequency conversion technology allows the system to dynamically adjust the furnace's power and heat output based on actual demand, a flexibility that is difficult to achieve with traditional fixed-power melting furnaces. Through close integration with the internally circulating furnace water system, the variable frequency melting furnace can not only adjust its power according to production needs, but also intelligently adjust it based on the status of the heat recovery system to optimize energy utilization.

[0047] This design also demonstrates the system's holistic and synergistic nature. Integrating the smelting furnace into the heat recovery system creates a closed-loop energy utilization model. Heat generated during the smelting process is no longer considered waste heat, but instead becomes a valuable heat source within the system, reusable in other processes or equipment. This integrated design significantly improves the system's energy efficiency and reduces unnecessary energy loss. It also provides a foundation for further system optimization and intelligentization.

[0048] For example, the efficiency of the melting furnace can be evaluated by monitoring recovered heat, or melting parameters can be dynamically adjusted based on the heat recovery status, achieving more refined production control. This design, which integrates the variable frequency melting furnace into the internal circulation furnace water system, creates an efficient, flexible, and intelligent heat recovery and utilization system. It not only addresses the limitations of traditional melting furnace systems in terms of heat utilization and energy efficiency, but also provides more room for energy conservation and optimization of the entire production system. This design reflects the important trend of industrial production systems towards high efficiency, high integration, and intelligence. It has the potential to become a new standard for energy utilization and heat management in the metallurgical industry, making a significant contribution to the green and sustainable development of industrial production.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electric furnace idle heat recycling system, characterized in that: It includes an internal circulation power supply water pump station, an internal circulation furnace water pump station, an external circulation water pump station, an open cooling tower and three groups of heat exchange units. One end of the open cooling tower is connected to the cold outlet of the first heat exchange unit, and the other end of the open cooling tower is connected to the external circulation water pump station. One end of the external circulation water pump station is connected to the open cooling tower, and the other end is connected to the cold inlet of the second heat exchange unit. The hot outlet of the second heat exchange unit is connected to one end of the internal circulation power supply water pump station. The other end of the internal circulation power supply water pump station is connected to a power cabinet, which is connected to the hot inlet of the second heat exchange unit through the power cabinet. The cold outlet of the second heat exchange unit is connected to the cold inlet of the first heat exchange unit, the hot outlet of the first heat exchange unit is connected to the input of the internal circulation furnace water pump station, the output of the internal circulation furnace water pump station is connected to the hot inlet of the first heat exchange unit, a variable frequency melting furnace is provided on the string line of the output end of the internal circulation furnace water pump station, the hot inlet and hot outlet of the third heat exchange unit are simultaneously connected to the string line of the output end of the internal circulation furnace water pump station, the cold inlet of the third heat exchange unit is connected to one end of the heat exchange equipment, and the other end of the heat exchange equipment is connected to the cold outlet of the third heat exchange unit.

2. The electric furnace idle heat recycling system according to claim 1, characterized in that: The open cooling tower has a built-in cold water pool and a hot water pool, wherein the cold water pool is connected to the external circulation water pump station, and the hot water pool supplies water to the cooling tower through a water supply pump, and the cooling tower is connected to the cold outlet of the first heat exchange unit.

3. The electric furnace idle heat recycling system according to claim 1, characterized in that: The heat outlet of the first heat exchange unit is provided with a water supply port, the heat outlet of the second heat exchange unit is provided with a water supply port, and the output end of the external circulation water pump station and the internal circulation furnace water pump station are provided with sewage outlets.

4. The electric furnace idle heat recycling system according to claim 1, characterized in that: The variable frequency smelting furnace is arranged on a string line at the output end of the internal circulation furnace body water pump station to conduct heat out of the variable frequency smelting furnace.

Images