Blast furnace slag flushing water waste heat auxiliary power generation system

Abstract

The utility model discloses a blast furnace slag flushing water waste heat auxiliary power generation system which comprises a blast furnace, a slag flushing water pipeline communicated with a water outlet of the blast furnace, a heat exchanger and a thermal power generation unit. The heat exchanger is used for receiving heat of slag flushing water in the slag flushing water pipeline and transmitting the heat to the thermal power generation unit, the slag flushing water pipeline comprises a first pipeline and a second pipeline, the first pipeline is communicated with the heat exchanger, and a flow control valve is arranged in the first pipeline and can open or close the first pipeline; the temperature sensing deformation part and the linkage part are arranged in the slag flushing water pipeline, the temperature sensing deformation part deforms due to temperature change, and when the temperature sensing deformation part reaches a preset temperature, the flow control valve is driven by the linkage part to open the first pipeline. The design not only solves the problems of low heat exchange efficiency and unstable system operation in the prior art, but also remarkably reduces the energy consumption, and meets the requirements of energy conservation and emission reduction in the iron and steel industry.

Description

Technical Field

[0001] This application belongs to the field of blast furnace heat energy recovery and utilization technology, specifically relating to a blast furnace slag flushing water waste heat auxiliary power generation system. Background Technology

[0002] Blast furnaces are core equipment in the steel production process, generating large amounts of high-temperature slag flushing water during operation. This flushing water is typically discharged through drain outlets, carrying a significant amount of waste heat. Industry data shows that the temperature of blast furnace slag flushing water is usually between 75℃ and 95℃, with the specific temperature depending on the blast furnace's operating conditions and process parameters. If this waste heat is not effectively utilized, it will not only lead to energy waste but may also cause thermal pollution to the environment. Therefore, how to efficiently recover and utilize the waste heat from blast furnace slag flushing water has become a crucial issue for energy conservation and emission reduction in the steel industry.

[0003] Currently, some technical solutions have attempted to utilize the waste heat of blast furnace slag flushing water for power generation. For example, by introducing the flushing water into a heat exchanger, the heat in the flushing water can be transferred to a thermal power generation unit, thereby driving a generator to produce electricity. However, in practical applications, the temperature of the blast furnace slag flushing water is not stable. Sometimes the temperature is high (e.g., above 90℃), which meets the heat exchange requirements; other times the temperature is low (e.g., 75℃ to 85℃), which cannot effectively transfer heat. Studies have shown that when the flushing water temperature is below 90℃, its heat transfer efficiency decreases significantly, and it may even fail to meet the minimum operating requirements of the thermal power generation unit. Existing technologies typically introduce all flushing water into the heat exchanger, leading to the following problems: Low heat exchange efficiency: When the flushing water temperature is low, its heat is insufficient to effectively transfer to the thermal power generation unit, resulting in low heat exchange efficiency and potentially affecting the normal operation of the thermal power generation unit; Energy waste: After low-temperature flushing water is introduced into the heat exchanger, it not only fails to effectively transfer heat but may also increase the system's operating burden, causing energy waste; Unstable system operation: Due to the large temperature fluctuations of the flushing water, existing systems struggle to achieve stable heat input, resulting in significant fluctuations in the operating efficiency of the thermal power generation unit. Utility Model Content

[0004] This application provides a waste heat auxiliary power generation system for blast furnace slag flushing water to solve the technical problem of low heat exchange efficiency caused by water temperature fluctuations in traditional blast furnace waste heat utilization systems.

[0005] The technical solution adopted in this application is as follows:

[0006] A blast furnace slag flushing water waste heat auxiliary power generation system includes a blast furnace, a slag flushing water pipeline connected to the blast furnace drain outlet, a heat exchanger, and a thermal power generation unit. The heat exchanger receives heat from the slag flushing water in the slag flushing water pipeline and transfers the heat to the thermal power generation unit. The slag flushing water pipeline includes a first pipeline and a second pipeline. The first pipeline is connected to the heat exchanger. A flow control valve is installed in the first pipeline, which can open or close the first pipeline. When the first pipeline is open, the slag flushing water in the slag flushing water pipeline enters the heat exchanger through the first pipeline. When the first pipeline is closed, the slag flushing water in the slag flushing water pipeline is discharged through the second pipeline. The system also includes a temperature-sensing deformation element and a linkage element installed in the slag flushing water pipeline. The temperature-sensing deformation element deforms in response to temperature changes. When the temperature-sensing deformation element reaches a preset temperature, it drives the flow control valve to open the first pipeline through the linkage element.

[0007] The blast furnace slag flushing water waste heat auxiliary power generation system described in this application also includes the following additional technical features:

[0008] The flow control valve has a valve core, which has a first position to cut off the first pipeline and a second position to open the first pipeline. When the temperature-sensing deformation member reaches a preset temperature, it drives the valve core to move from the first position to the second position through the linkage.

[0009] The temperature-sensitive deformable component includes two mutually bonded first metal sheets and a second metal sheet. The coefficient of thermal expansion of the first metal sheet is greater than that of the second metal sheet. The temperature-sensitive deformable component has a fixed end connected to the inner wall of the slag flushing water pipe and a free end located away from the fixed end. When the temperature-sensitive deformable component heats up, the first metal sheet bends toward the second metal sheet and drives the valve core to switch from a first position to a second position through the linkage.

[0010] It also includes an elastic reset member. When the temperature-sensing deformation member is lower than the preset temperature, the linkage member separates from the valve core, and the elastic reset member drives the valve core to switch from the second position to the first position.

[0011] The slag flushing water pipeline also includes a main pipeline connected to the blast furnace drain outlet. The flow control valve is configured as a three-way valve connecting the main pipeline to the first pipeline and the second pipeline. The three-way valve has a first port connected to the first pipeline and a second port connected to the second pipeline. When the valve core is in the first position, the first port is closed and the main pipeline is connected to the second pipeline. When the valve core is in the second position, the valve core closes the second port and the main pipeline is connected to the first pipeline.

[0012] A slag-water separation tank is provided between the slag flushing water pipeline and the blast furnace drain outlet. The slag-water separation tank is connected to the blast furnace drain outlet, and the slag flushing water pipeline is connected to the slag-water separation tank through a first water pump.

[0013] It also includes a water recovery tank, which is connected to the second pipeline and the blast furnace inlet.

[0014] The thermal power generation unit includes a thermal generator, a steam boiler, and a condensate tank, and the heat exchanger, the steam boiler, the thermal generator, and the condensate tank are connected in sequence by water pipes.

[0015] The thermal power generation unit also includes a heat storage component, which is connected to the heat exchanger and the steam boiler respectively, and a regulating valve is provided between the heat exchanger and the heat storage component.

[0016] A second water pump is provided between the condensate tank and the steam boiler.

[0017] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0018] 1. This application achieves efficient recovery and utilization of waste heat from blast furnace slag flushing water by introducing a linkage design between a temperature-sensing deformable element and a flow control valve. In practical applications, the temperature of blast furnace slag flushing water fluctuates significantly. Traditional technology introduces all the flushing water into the heat exchanger, resulting in the low-temperature flushing water failing to effectively transfer heat and even increasing the system's operational burden. This application, however, uses a temperature-sensing deformable element to monitor the flushing water temperature in real time. When the temperature reaches a preset value (e.g., above 90℃), the element deforms, driving the flow control valve to open the first pipeline via a linkage, allowing the high-temperature flushing water to enter the heat exchanger for heat transfer. When the temperature falls below the preset value, the flow control valve shuts off the first pipeline, and the flushing water is directly discharged through the second pipeline. This design significantly improves heat exchange efficiency and avoids the negative impact of low-temperature flushing water on the system. Through its automatic adjustment mechanism, this application can precisely control the temperature of the flushing water entering the heat exchanger, ensuring that the thermal power generation unit always operates at high efficiency. Furthermore, the direct discharge of low-temperature flushing water through the second pipeline avoids unnecessary heat loss and energy waste, further improving the overall system efficiency. This design not only solves the problems of low heat exchange efficiency and unstable system operation in existing technologies, but also significantly reduces energy consumption, meeting the energy conservation and emission reduction requirements of the steel industry. At the same time, the system has a high degree of automation, reducing the need for manual intervention and lowering the workload of operators, making it suitable for long-term stable operation in harsh environments with high temperature and humidity.

[0019] 2. As a preferred embodiment of this application, the automatic control of the slag flushing water pipeline is achieved through precise switching of the valve core. In practical applications, the valve core design enables the system to respond quickly to temperature changes. When the temperature-sensing deformation component detects that the slag flushing water temperature reaches a preset value, it drives the valve core to switch from the first position to the second position via a linkage, opening the first pipeline and allowing the high-temperature slag flushing water to enter the heat exchanger. When the temperature is lower than the preset value, the valve core resets, cutting off the first pipeline, and the slag flushing water is discharged through the second pipeline. This design not only improves the system's response speed but also ensures the high efficiency and stability of heat transfer. In actual working environments, the temperature of blast furnace slag flushing water fluctuates frequently, making precise control difficult with traditional technologies, resulting in low heat transfer efficiency. This application, through precise valve core switching, can quickly adapt to temperature changes, ensuring that only high-temperature slag flushing water enters the heat exchanger, thereby significantly improving heat exchange efficiency. Furthermore, the valve core has a simple and reliable structure, enabling long-term stable operation in harsh environments with high temperature and humidity, reducing system failure rates and maintenance costs. This design not only enhances the system's automation level but also reduces the need for manual intervention, further improving production efficiency.

[0020] 3. As a preferred embodiment of this application, the temperature response capability and control accuracy of the system are further improved by adopting a bimetallic strip structure for the temperature-sensing deformable component. In practical applications, the first and second metal strips have different coefficients of thermal expansion. When the temperature of the slag flushing water rises, the first metal strip bends towards the second metal strip, driving the valve core to switch via a linkage, thereby achieving automatic control of the pipeline. This design enables the system to respond quickly to temperature changes, ensuring that high-temperature slag flushing water enters the heat exchanger in a timely manner, while low-temperature slag flushing water is quickly discharged, significantly improving heat transfer efficiency. In actual working environments, the temperature fluctuation of blast furnace slag flushing water is large, and traditional technologies struggle to achieve precise control, resulting in low heat transfer efficiency. However, this application, through its bimetallic strip structure, can quickly and accurately detect temperature changes and drive the valve core to switch, ensuring that the system is always in a highly efficient operating state. In addition, the bimetallic strip material is resistant to high temperatures and corrosion, making it suitable for long-term use in the high-temperature and high-humidity environment of blast furnace slag flushing water, extending the service life of the equipment. This design not only improves the reliability and stability of the system but also reduces maintenance costs, making it suitable for large-scale promotion and use in the steel industry.

[0021] 4. As a preferred embodiment of this application, the inclusion of an elastic reset component further enhances the system's automation level and operational stability. In practical applications, when the temperature-sensing deformation component detects that the slag flushing water temperature is lower than a preset value, the linkage separates from the valve core, and the elastic reset component drives the valve core to reset, cutting off the first pipeline and allowing the slag flushing water to be discharged through the second pipeline. This design enables the system to quickly adapt to temperature changes, ensuring that low-temperature slag flushing water does not enter the heat exchanger, thereby avoiding problems such as low heat transfer efficiency and increased system operating burden. In actual working environments, the temperature of blast furnace slag flushing water fluctuates frequently, making precise control difficult with traditional technologies, leading to unstable system operation. This application, through the addition of an elastic reset component, can quickly complete the valve core reset operation, eliminating the need for manual valve core reset and ensuring the system is always in optimal operating condition.

[0022] 5. As a preferred embodiment of this application, the structure of the flushing water pipeline is further optimized by adopting a three-way valve design, improving the system's operating efficiency and flexibility. In practical applications, the three-way valve can quickly switch the connection status between the main pipeline and the first or second pipeline. When the flushing water temperature reaches a preset value, the three-way valve opens the first pipeline, allowing the high-temperature flushing water to enter the heat exchanger; when the temperature is lower than the preset value, the three-way valve switches to the second pipeline, allowing the low-temperature flushing water to be discharged directly. This design enables the system to quickly adapt to temperature changes, ensuring efficient and stable heat transfer.

[0023] 6. As a preferred embodiment of this application, by setting up a slag-water separation tank, solid particles and impurities in the flushing slag water can be effectively separated, ensuring that the flushing slag water entering the heat exchanger is cleaner. This not only improves the heat transfer efficiency of the heat exchanger but also significantly extends the service life of the heat exchanger, pipelines, and other related equipment, reducing equipment maintenance costs and downtime. The effective removal of solid particles in the flushing slag water reduces the impact of impurities on the heat transfer efficiency of the heat exchanger. Clean flushing slag water can more efficiently transfer heat to the thermal power generation unit, thereby improving the efficiency of waste heat recovery. Furthermore, the slag-water separation tank can not only separate solid particles but also perform preliminary sedimentation and treatment of harmful substances in the flushing slag water. This reduces the possibility of harmful substances entering subsequent systems, lowers the risk of environmental pollution, and meets the requirements of energy conservation, emission reduction, and green production in the steel industry.

[0024] 7. As a preferred embodiment of this application, by setting up a water recycling tank, the low-temperature slag flushing water that cannot be used for thermal power generation can be recycled and reintroduced to the blast furnace inlet for blast furnace cooling or other process steps. This recycling of water resources significantly reduces the water costs of steel enterprises while reducing the consumption of fresh water, which meets the requirements of sustainable development. Simultaneously, the water recycling tank can further treat the slag flushing water to ensure that its water quality meets the requirements for blast furnace operation, thereby improving the overall system operating efficiency. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0026] Figure 1 This is a schematic diagram of a waste heat auxiliary power generation system for blast furnace slag flushing water according to one embodiment of this application;

[0027] Figure 2 This is a cross-sectional view of a flow control valve according to one embodiment of this application;

[0028] Figure 3 This is a schematic diagram of the temperature-sensing deformation member, the linkage member, and the valve core according to one embodiment of this application. Figure 1 ;

[0029] Figure 4 This is a schematic diagram of the temperature-sensing deformation member, the linkage member, and the valve core according to one embodiment of this application. Figure 2 .

[0030] List of components and reference numerals:

[0031] 1. Blast furnace;

[0032] 2. Slag flushing water pipeline; 21. First pipeline; 22. Second pipeline; 23. Main pipeline;

[0033] 3. Heat exchangers;

[0034] 4 thermal power generation unit, 41 thermal generator, 42 steam boiler, 43 condensate tank, 44 thermal storage unit;

[0035] 5 Flow control valve, 51 Valve core, 511 First water inlet, 52 First port, 53 Second port;

[0036] 6. Temperature-sensitive deformation component, 61. First metal sheet, 62. Second metal sheet;

[0037] 7-linkage mechanism;

[0038] 8. Slag-water separation tank;

[0039] 9. First water pump;

[0040] 10. Water recycling tank;

[0041] 110 regulating valve;

[0042] 120 Second Water Pump;

[0043] 130 elastic reset component. Detailed Implementation

[0044] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0045] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0046] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0047] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0049] like Figures 1 to 4As shown, a blast furnace slag flushing water waste heat auxiliary power generation system includes a blast furnace 1, a slag flushing water pipe 2 connected to the blast furnace 1 drain outlet, a heat exchanger 3, and a thermal power generation unit 4. The heat exchanger 3 is used to receive the heat of the slag flushing water in the slag flushing water pipe 2 and transfer the heat to the thermal power generation unit 4. The slag flushing water pipe 2 includes a first pipe 21 and a second pipe 22. The first pipe 21 is connected to the heat exchanger 3. A flow control valve 5 is provided in the first pipe 21. The flow control valve 5 can open or close the first pipe 21. When the first pipe 21 is open, the slag flushing water in the slag flushing water pipe 2 enters the heat exchanger 3 through the first pipe 21. When the first pipe 21 is closed, the slag flushing water in the slag flushing water pipe 2 is discharged through the second pipe 22. The system also includes a temperature-sensing deformation element 6 and a linkage element 7 installed in the slag flushing water pipe 2. The temperature-sensing deformation element 6 deforms under temperature changes. When the temperature-sensing deformation element 6 reaches a preset temperature, it drives the flow control valve 5 to open the first pipe 21 through the linkage element 7.

[0050] This application achieves efficient recovery and utilization of waste heat from blast furnace slag flushing water by introducing a linkage design between a temperature-sensing deformable element 6 and a flow control valve 5. In practical applications, the temperature of blast furnace slag flushing water fluctuates significantly. Traditional technology introduces all the flushing water into the heat exchanger 3, resulting in the low-temperature flushing water failing to effectively transfer heat and even increasing the system's operational burden. This application, however, uses the temperature-sensing deformable element 6 to monitor the flushing water temperature in real time. When the temperature reaches a preset value (e.g., above 90℃), the temperature-sensing deformable element 6 deforms, driving the flow control valve 5 to open the first pipeline 21 via the linkage 7, allowing the high-temperature flushing water to enter the heat exchanger 3 for heat transfer. When the temperature falls below the preset value, the flow control valve 5 shuts off the first pipeline 21, and the flushing water is directly discharged through the second pipeline 22. This design significantly improves heat exchange efficiency and avoids the negative impact of low-temperature flushing water on the system. Through its automatic adjustment mechanism, this application can precisely control the temperature of the flushing water entering the heat exchanger 3, ensuring that the thermal power generation unit 4 is always operating at high efficiency. Furthermore, the low-temperature slag flushing water is directly discharged through the second pipeline 22, avoiding unnecessary heat loss and energy waste, and further improving the overall efficiency of the system. This design not only solves the problems of low heat exchange efficiency and unstable system operation in existing technologies, but also significantly reduces energy consumption, meeting the energy conservation and emission reduction requirements of the steel industry. At the same time, the system has a high degree of automation, reducing the need for manual intervention, lowering the workload of operators, and is suitable for long-term stable operation in harsh environments with high temperature and high humidity.

[0051] As a preferred embodiment of this application, such as Figures 2 to 4 As shown, the flow control valve 5 has a valve core 51, which has a first position to cut off the first pipeline 21 and a second position to open the first pipeline 21. When the temperature sensing deformation member 6 reaches the preset temperature, it drives the valve core 51 to move from the first position to the second position through the linkage member 7.

[0052] The precise switching of valve core 51 enables automatic control of the slag flushing water pipeline. In practical applications, the design of valve core 51 allows the system to respond quickly to temperature changes. When the temperature-sensing deformation element 6 detects that the slag flushing water temperature reaches a preset value, it drives valve core 51 to switch from the first position to the second position via linkage 7, opening the first pipeline 21 and allowing the high-temperature slag flushing water to enter the heat exchanger 3. When the temperature is lower than the preset value, valve core 51 resets, cutting off the first pipeline 21, and the slag flushing water is discharged through the second pipeline 22. This design not only improves the system's response speed but also ensures the high efficiency and stability of heat transfer. In actual working environments, the temperature of blast furnace slag flushing water fluctuates frequently, making precise control difficult with traditional technologies, resulting in low heat transfer efficiency. However, this application, through the precise switching of valve core 51, can quickly adapt to temperature changes, ensuring that only high-temperature slag flushing water enters the heat exchanger 3, thereby significantly improving heat exchange efficiency. Furthermore, the valve core 51 has a simple and reliable structure, enabling long-term stable operation in harsh environments with high temperature and humidity, reducing system failure rate and maintenance costs. This design not only enhances the system's automation level but also reduces the need for manual intervention, further improving production efficiency.

[0053] Specifically, Figure 2 The middle arrow X indicates the path of the flushing water flowing through the second pipeline; at this time, the valve core is in... Figure 3 The first position shown, Figure 2 The middle arrow Y indicates the path of the flushing water flowing through the first pipeline, at which point the valve core is in position. Figure 3 The second position is shown in the diagram. The valve core 51 is provided with multiple first water passage ports 511, and the flow control valve 5 is provided with multiple second water passage ports. The temperature-sensing deformation member 6 can drive the valve core 51 to rotate through the linkage member 7. When the valve core 51 is in the first position, the first water passage ports 511 and the second water passage ports are aligned and connected, and the first pipeline 21 is opened; when the valve core 51 is in the second position, the first water passage ports 511 and the second water passage ports are misaligned, and the first pipeline 21 is closed.

[0054] As a preferred embodiment of this implementation, such as Figure 3 , Figure 4 As shown, the temperature-sensing deformable component 6 includes two mutually attached first metal sheets 61 and second metal sheets 62. The coefficient of thermal expansion of the first metal sheet 61 is greater than that of the second metal sheet 62. The temperature-sensing deformable component 6 has a fixed end connected to the inner wall of the slag flushing water pipe 2 and a free end located away from the fixed end. When the temperature-sensing deformable component 6 heats up, the first metal sheet 61 bends towards the second metal sheet 62 and drives the valve core 51 to switch from the first position to the second position through the linkage 7.

[0055] By employing a bimetallic strip structure for the temperature-sensing deformable element 6, the system's temperature response capability and control accuracy are further enhanced. In practical applications, the first metal strip 61 and the second metal strip 62 have different coefficients of thermal expansion. When the slag flushing water temperature rises, the first metal strip 61 bends towards the second metal strip 62, driving the valve core 51 to switch via the linkage 7, thereby achieving automatic pipeline control. This design enables the system to respond quickly to temperature changes, ensuring that high-temperature slag flushing water enters the heat exchanger 3 in a timely manner, while low-temperature slag flushing water is quickly discharged, significantly improving heat transfer efficiency. In actual working environments, the temperature fluctuation of blast furnace slag flushing water is large, making precise control difficult with traditional technologies, resulting in low heat transfer efficiency. However, this application, through its bimetallic strip structure, can quickly and accurately detect temperature changes and drive the valve core 51 to switch, ensuring the system is always in a highly efficient operating state. Furthermore, the bimetallic strip material is resistant to high temperatures and corrosion, making it suitable for long-term use in the high-temperature and high-humidity environment of blast furnace slag flushing water, extending the equipment's service life. This design not only improves the system's reliability and stability but also reduces maintenance costs, making it suitable for large-scale application in the steel industry.

[0056] Preferably, the first metal sheet 61 is a copper sheet and the second metal sheet 62 is a steel sheet. The copper sheet has a higher coefficient of thermal expansion and deforms more when heated, which in turn causes the temperature-sensitive deformation component 6 to deform.

[0057] As a preferred example of this embodiment, it also includes an elastic reset member 130. When the temperature-sensing deformation member 6 is lower than the preset temperature, the linkage member 7 separates from the valve core 51, and the elastic reset member 130 drives the valve core 51 to switch from the second position to the first position.

[0058] The inclusion of the elastic reset element 130 further enhances the system's automation and operational stability. In practical applications, when the temperature-sensing deformation element 6 detects that the slag flushing water temperature is lower than the preset value, the linkage element 7 separates from the valve core 51, and the elastic reset element 130 drives the valve core 51 to reset, cutting off the first pipeline 21 and allowing the slag flushing water to be discharged through the second pipeline 22. This design enables the system to quickly adapt to temperature changes, ensuring that low-temperature slag flushing water does not enter the heat exchanger 3, thereby avoiding problems such as low heat transfer efficiency and increased system operating burden. In actual working environments, the temperature of blast furnace slag flushing water fluctuates frequently, making precise control difficult with traditional technologies, leading to unstable system operation. This application, through the addition of the elastic reset element 130, can quickly complete the reset operation of the valve core 51, eliminating the need for manual reset operations and ensuring the system is always in optimal operating condition. Preferably, the elastic reset element 130 is a spring.

[0059] Preferably, such as Figure 1As shown, the slag flushing water pipeline 2 also includes a main pipeline 23 connected to the drain outlet of the blast furnace 1. The flow control valve 5 is configured as a three-way valve connecting the main pipeline 23 to the first pipeline 21 and the second pipeline 22. The three-way valve has a first port 52 connected to the first pipeline 21 and a second port 53 connected to the second pipeline 22. When the valve core 51 is in the first position, the first port 52 is closed, and the main pipeline 23 is connected to the second pipeline 22. When the valve core 51 is in the second position, the valve core 51 closes the second port 53, and the main pipeline 23 is connected to the first pipeline 21.

[0060] By adopting a three-way valve design, the structure of the flushing water pipeline 2 is further optimized, improving the system's operating efficiency and flexibility. In practical applications, the three-way valve can quickly switch the connection status between the main pipeline 23 and either the first pipeline 21 or the second pipeline 22. When the flushing water temperature reaches a preset value, the three-way valve opens the first pipeline 21, allowing the high-temperature flushing water to enter the heat exchanger 3; when the temperature is lower than the preset value, the three-way valve switches to the second pipeline 22, allowing the low-temperature flushing water to be discharged directly. This design enables the system to quickly adapt to temperature changes, ensuring efficient and stable heat transfer.

[0061] As a preferred embodiment of this application, such as Figure 1 As shown, a slag-water separation tank 8 is provided between the slag flushing water pipe 2 and the blast furnace 1 drain outlet. The slag-water separation tank 8 is connected to the blast furnace 1 drain outlet, and the slag flushing water pipe 2 is connected to the slag-water separation tank 8 through the first water pump 9.

[0062] By setting up the slag-water separation tank 8, solid particles and impurities in the flushing slag water can be effectively separated, ensuring that the flushing slag water entering the heat exchanger 3 is cleaner. This not only improves the heat transfer efficiency of the heat exchanger 3, but also significantly extends the service life of the heat exchanger 3, pipelines, and other related equipment, reducing equipment maintenance costs and downtime. The effective removal of solid particles in the flushing slag water reduces the impact of impurities on the heat transfer efficiency of the heat exchanger 3. Clean flushing slag water can more efficiently transfer heat to the thermal power generation unit 4, thereby improving the efficiency of waste heat recovery. Furthermore, the slag-water separation tank 8 can not only separate solid particles, but also perform preliminary sedimentation and treatment of harmful substances in the flushing slag water. This reduces the possibility of harmful substances entering subsequent systems, lowers the risk of environmental pollution, and meets the requirements of energy conservation, emission reduction, and green production in the steel industry.

[0063] As a preferred embodiment of this application, such as Figure 1 As shown, it also includes a water recovery tank 10, which is connected to the second pipeline 22 and the water inlet of the blast furnace 1.

[0064] By setting up a water recycling pond 10, the low-temperature slag flushing water that cannot be used for thermal power generation can be recycled and reintroduced to the blast furnace 1 inlet for blast furnace 1 cooling or other process steps. This recycling of water resources significantly reduces the water costs of steel enterprises while reducing the consumption of fresh water, which meets the requirements of sustainable development. At the same time, the water recycling pond 10 can also further treat the slag flushing water to ensure that its water quality meets the operating requirements of blast furnace 1, thereby improving the operating efficiency of the entire system.

[0065] As a preferred embodiment of this application, such as Figure 1 As shown, the thermal power generation unit 4 includes a thermal generator 41, a steam boiler 42, and a condensate pool 43. The heat exchanger 3, the steam boiler 42, the thermal generator 41, and the condensate pool 43 are connected in sequence through water pipes.

[0066] By sequentially connecting heat exchanger 3, steam boiler 42, thermoelectric generator 41, and condensate pool 43, a complete thermoelectric power generation cycle system is constructed. High-temperature flushing water transfers heat to steam boiler 42 via heat exchanger 3. The high-temperature steam generated by steam boiler 42 drives thermoelectric generator 41 to generate electricity. The steam after power generation is cooled in condensate pool 43 and recirculated. This design fully utilizes the waste heat resources in the flushing water, significantly improving the efficiency of waste heat power generation.

[0067] As a preferred embodiment of this implementation, such as Figure 1 As shown, the thermal power generation unit 4 also includes a heat storage component 44, which is connected to the heat exchanger 3 and the steam boiler 42 respectively. A regulating valve 110 is provided between the heat exchanger 3 and the heat storage component 44.

[0068] The temperature of the blast furnace flushing water may fluctuate significantly during actual operation, posing a challenge to the stable operation of the thermal power generation unit 4. By adding a heat storage component 44, the system can store excess heat when the flushing water temperature is high and release the stored heat when the flushing water temperature is low, thereby ensuring the stable operation of the thermal power generation unit 4. This design significantly improves the system's ability to cope with temperature fluctuations. This design maximizes the utilization of heat in the flushing water and avoids energy waste.

[0069] Preferably, such as Figure 1 As shown, a second water pump 120 is installed between the condensate tank 43 and the steam boiler 42. The second water pump 120 allows cooling water from the condensate tank 43 to be delivered to the steam boiler 42 more efficiently, ensuring the stable operation of the steam boiler 42. In actual operation, the distance between the condensate tank 43 and the steam boiler 42 may be relatively large. Without the second water pump 120, the delivery of cooling water might be limited, affecting the operational stability of the system. By adding the second water pump 120, the system's operational stability is significantly improved.

[0070] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0071] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0072] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A blast furnace slag flushing water waste heat assisted power generation system, comprising a blast furnace, a slag flushing water pipeline in communication with a blast furnace water outlet, a heat exchanger and a heat power generation unit; the heat exchanger is used for receiving heat of the slag flushing water in the slag flushing water pipeline and transferring heat to the heat power generation unit, characterized in that, The slag flushing water pipeline comprises a first pipeline and a second pipeline, the first pipeline is communicated with the heat exchanger, a flow control valve is arranged in the first pipeline, the flow control valve can open or cut off the first pipeline, when the first pipeline is opened, the slag flushing water in the slag flushing water pipeline enters the heat exchanger through the first pipeline, when the first pipeline is cut off, the slag flushing water in the slag flushing water pipeline is discharged through the second pipeline, a temperature sensing deformation part and a linkage part are arranged in the slag flushing water pipeline, the temperature sensing deformation part is deformed by temperature change, when the temperature sensing deformation part reaches a preset temperature, the flow control valve is driven by the linkage part to open the first pipeline.

2. The blast furnace slag flushing water waste heat auxiliary power generation system according to claim 1, wherein the flow control valve has a valve core, the valve core has a first position for cutting off the first pipeline and a second position for opening the first pipeline, when the temperature sensing deformation part reaches the preset temperature, the valve core is driven by the linkage part to move from the first position to the second position.

3. The blast furnace slag flushing water waste heat auxiliary power generation system according to claim 2, wherein the temperature sensing deformation part comprises a first metal sheet and a second metal sheet which are attached to each other, the first metal sheet has a thermal expansion coefficient which is greater than that of the second metal sheet, the temperature sensing deformation part has a fixed end which is connected to the inner wall of the slag flushing water pipeline and a free end which is located on the side away from the fixed end, when the temperature sensing deformation part is heated, the first metal sheet is bent towards the second metal sheet, and the valve core is switched from the first position to the second position by the linkage part.

4. The blast furnace slag flushing water waste heat auxiliary power generation system according to claim 3, wherein a resilient reset part is further arranged, when the temperature sensing deformation part is below the preset temperature, the linkage part is separated from the valve core, and the resilient reset part drives the valve core to switch from the second position to the first position.

5. The blast furnace slag flushing water waste heat auxiliary power generation system according to any one of claims 2 to 4, wherein the slag flushing water pipeline further comprises a main pipeline which is communicated with the blast furnace water outlet, the flow control valve is configured as a three-way valve which connects the main pipeline with the first pipeline and the second pipeline, the three-way valve has a first port which is communicated with the first pipeline and a second port which is communicated with the second pipeline, when the valve core is in the first position, the first port is closed, and the main pipeline is communicated with the second pipeline, when the valve core is in the second position, the valve core closes the second port, and the main pipeline is communicated with the first pipeline.

6. The blast furnace slag flushing water waste heat auxiliary power generation system according to claim 1, wherein a slag water separation tank is arranged between the slag flushing water pipeline and the blast furnace water outlet, the slag water separation tank is communicated with the blast furnace water outlet, and the slag flushing water pipeline is communicated with the slag water separation tank through a first water pump.

7. The blast furnace slag flushing water waste heat auxiliary power generation system according to claim 1, wherein A water recovery tank is further included, which is communicated with the second pipeline and a blast furnace water inlet respectively. 8.The blast furnace slag flushing water waste heat assisted power generation system according to claim 1, characterized in that, The heat power generation unit comprises a heat generator, a steam boiler and a condensation tank, and the heat exchanger, the steam boiler, the heat generator and the condensation tank are sequentially communicated through water pipes. 9.The blast furnace slag flushing water waste heat assisted power generation system according to claim 8, characterized in that, The heat power generation unit further comprises a heat storage member, which is connected with the heat exchanger and the steam boiler respectively, and an adjusting valve is arranged between the heat exchanger and the heat storage member. 10.The blast furnace slag flushing water waste heat assisted power generation system according to claim 9, characterized in that, A second water pump is arranged between the condensation tank and the steam boiler.

Images