A blast furnace slag flushing water waste heat desalination system

Abstract

The application discloses a blast furnace slag flushing water waste heat desalination water system, which comprises a blast furnace, a first water conveying pipeline communicated with a water outlet of the blast furnace, a heat exchange unit and a desalination water unit; the heat exchange unit is used for receiving heat of the slag flushing water in the first water conveying pipeline and transferring the heat to the desalination water unit; a temperature control adjusting assembly is arranged between the heat exchange unit and a RO permeation assembly; the temperature control adjusting assembly comprises a temperature control deformation mechanism arranged in the second water conveying pipeline and a valve piece; the temperature control deformation mechanism is deformed due to temperature change; when the temperature of the salt water in the second water conveying pipeline reaches or is higher than a preset temperature, the temperature control deformation mechanism drives the valve piece to move to cut off the second water conveying pipeline. The temperature control adjusting assembly automatically senses the temperature and drives the valve piece to move to cut off the second water conveying pipeline, so that the probability of heat damage of the RO membrane due to excessively high temperature of raw water is greatly reduced, and the working stability and working life of the desalination water system are ensured.

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 demineralization system. Background Technology

[0002] Blast furnaces generate large amounts of high-temperature slag flushing water during steelmaking, with temperatures reaching 80-90°C. This flushing water is typically discharged directly or recycled after simple cooling, resulting in ineffective utilization of its waste heat and energy waste. Currently, the main methods for recovering waste heat from blast furnace slag flushing water include: district heating in winter, low-temperature power generation by ORC units, and preheating of demineralized water preparation systems. Among these, using the waste heat from slag flushing water for preheating the feed water of RO reverse osmosis demineralized water systems can significantly reduce steam or electric heating energy consumption.

[0003] RO (Reverse Osmosis) desalination systems use RO membranes as filtration elements. Pressure forces raw water through the RO membrane, allowing pure water to pass through while blocking impurities such as salts, organic matter, and colloids, thus purifying the raw water. However, the water extraction efficiency of the RO membrane is related to the raw water temperature. Too low a temperature reduces the membrane's purification efficiency, while too high a temperature can damage the membrane structure, leading to a decrease in desalination rate. For example, RO membranes made of polyamide will suffer irreversible damage when the influent temperature exceeds 45℃.

[0004] Therefore, the temperature of the preheated raw water should be controlled between 25℃ and 35℃. However, due to the drastic temperature fluctuations of the flushing water, the outlet water temperature of the heat exchanger is prone to exceed the limit, resulting in excessively high raw water temperature. This poses a risk of damaging the RO membrane. The cumulative effect of this thermal damage will gradually increase the impact on the permeation efficiency of the RO membrane, requiring frequent replacement of the RO membrane and significantly increasing the operating cost of the desalination system. Utility Model Content

[0005] This application provides a waste heat demineralized water system for blast furnace slag flushing water to solve the technical problems such as excessively high raw water temperature and damage to RO permeation components caused by large temperature fluctuations in the slag flushing water when heating raw water with waste heat from traditional blast furnace slag flushing water.

[0006] The technical solution adopted in this application is as follows:

[0007] A blast furnace slag flushing water waste heat demineralization system includes a blast furnace, a first water supply pipe connected to the blast furnace's drain outlet, a heat exchange unit, and a demineralization unit. The heat exchange unit receives heat from the slag flushing water in the first water supply pipe and transfers the heat to the demineralization unit. The demineralization unit includes a water storage tank and an RO permeation module. The water storage tank stores raw water, and its outlet is connected to the heat exchange unit and the RO permeation module sequentially via a second water supply pipe. A temperature control and regulation component is provided between the heat exchange unit and the RO permeation module in the second water supply pipe. The temperature control and regulation component includes a temperature control deformation mechanism and a valve plate disposed inside the second water supply pipe. The temperature control deformation mechanism deforms in response to temperature changes. When the brine temperature in the second water supply pipe reaches or exceeds a preset temperature, the temperature control deformation mechanism drives the valve plate to move and shut off the second water supply pipe.

[0008] The demineralized water system described in this application also includes the following additional technical features:

[0009] The second water supply pipe is provided with a flow plate that abuts against the valve plate. The flow plate has a first flow hole, and the valve plate has a second flow hole. The valve plate has a flow position that aligns and connects the first flow hole and the second flow hole, and a cut-off position that misaligns the first flow hole and the second flow hole. The temperature control deformation mechanism drives the valve plate to move from the flow position to the cut-off position to cut off the second water supply pipe.

[0010] The inner wall of the second water supply pipe is provided with a sliding groove, and the valve plate is circular and partially located in the sliding groove. The valve plate slides in the sliding groove to switch between the cut-off position and the flow position.

[0011] The temperature-controlled deformation mechanism includes a temperature-controlled deformation component and a connecting rod. The temperature-controlled deformation component consists of two mutually fitted first metal sheets and a second metal sheet. The thermal expansion coefficient of the first metal sheet is greater than that of the second metal sheet. The temperature-controlled deformation component has a fixed end connected to the inner wall of the second water supply pipe and a free end located away from the fixed end. When the temperature-controlled deformation component heats up, the first metal sheet bends towards the second metal sheet, and the connecting rod drives the valve plate to switch from the flow position to the cut-off position.

[0012] The valve plate has an outwardly protruding part, and the connecting rod acts on the protruding part to drive the valve plate to rotate; the temperature control deformation mechanism also includes an elastic reset member, one end of which is fixedly connected to the inner wall of the second water supply pipe, and the other end abuts against the protruding part, so that when the connecting rod removes the force applied to the protruding part, the elastic reset member abuts against the valve plate to rotate from the cut-off position to the flow position.

[0013] The second water supply pipeline is equipped with a three-way solenoid valve in the section between the heat exchange unit and the RO permeation component. The three-way solenoid valve has a first inlet, a second inlet, and an outlet. The second water supply pipeline includes a first section connecting the heat exchange unit and the first inlet, and a second section connecting the outlet and the RO permeation component. The water storage tank is connected to the second inlet through a third water supply pipeline. The demineralized water system also includes a temperature detector and a controller located in the first section. The temperature detector can detect the temperature of the first section. When the temperature is equal to or higher than a preset temperature, the controller controls the second inlet to open. When the temperature is lower than the preset temperature, the controller controls the second inlet to close.

[0014] The first water supply pipeline is connected to the water inlet of the blast furnace after passing through the heat exchange unit. The first water supply pipeline includes a first section connecting the water outlet of the blast furnace and the heat exchange unit, and a second section connecting the heat exchange unit and the water inlet of the blast furnace. The first section is equipped with a hydrocyclone separator, which is used to separate the solid waste of the slag flushing water in the first water supply pipeline.

[0015] The cyclone separator includes a tube body, the interior of which is hollow to form a separation chamber. The tube body is inverted conical in shape and has an inlet on its side. The cyclone separator also includes an overflow pipe, one end of which is located inside the separation chamber and the other end extends vertically. The inlet and the overflow pipe are respectively connected to the first section.

[0016] The hydrocyclone separator is provided with a slag receiving bin at the bottom, and the tube body is provided with a slag discharge port at the bottom, which is connected to the slag receiving bin.

[0017] The preset temperature is between 38°C and 40°C.

[0018] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0019] 1. The blast furnace slag flushing water waste heat demineralized water system of this application connects the blast furnace outlet to the heat exchange unit via a first water supply pipeline, supplying high-temperature slag flushing water to the heat input end of the heat exchange unit. The heat exchange unit then exchanges heat with a second water supply pipeline connected to the heat output end of the heat exchange unit. A storage tank supplies raw water to the RO permeation module via the second water supply pipeline. After being heated by the heat exchange unit, the raw water's temperature increases, allowing it to pass through the RO membrane in the RO permeation module with faster filtration efficiency, thus improving the filtration efficiency of the raw water. Furthermore, a temperature control regulating component is installed between the heat exchange unit and the RO permeation module in the second water supply pipeline. When the slag flushing water temperature is high or other factors cause the raw water temperature in the second water supply pipeline to exceed a preset temperature that may damage the RO membrane, the temperature control regulating component automatically senses the temperature and actuates the valve to shut off the second water supply pipeline. This significantly reduces the probability of the RO membrane being damaged by excessively high raw water temperature, ensuring the operational stability and service life of the demineralized water system.

[0020] 2. In a preferred embodiment of this application, the flow path is continuously connected when the first flow hole of the flow plate and the second flow hole of the valve plate are aligned and connected through the contact between the flow plate and the valve plate. When they are misaligned, a physical hard seal is formed to cut off the water flow. The second water supply pipe is cut off through the response and cooperation of the mechanical structure, which not only has a high temperature response rate, but also has high operational stability.

[0021] 3. In a preferred embodiment of this application, when the water temperature in the second water supply pipeline is equal to or higher than a preset temperature, the temperature-controlled deformation mechanism drives the valve plate to precisely translate along the pipeline axis within the sliding groove, causing the second flow-through hole on the valve plate to be completely misaligned with the first flow-through hole of the flow plate. At this time, the solid part of the valve plate completely covers the first flow-through hole to form a physical isolation barrier, completely cutting off the second water supply pipeline. This mechanical switching mechanism does not require external energy to drive it; it achieves the "full flow-to-full closure" state transition solely through structural displacement. While ensuring daily operating efficiency, it establishes a reliable overheat protection system for the RO membrane. Attached Figure Description

[0022] 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:

[0023] Figure 1 This is a schematic diagram of a waste heat demineralized water system for blast furnace slag flushing according to one embodiment of this application;

[0024] Figure 2 This is a cross-sectional view of the first water delivery pipe when the valve plate is in the flow position according to one embodiment of this application;

[0025] Figure 3 This is a cross-sectional view of the first water supply pipeline when the valve plate is in the cut-off position according to one embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the temperature control adjustment assembly and the valve plate when the valve plate is in the flow position according to one embodiment of this application;

[0027] Figure 5 This is a schematic diagram of the temperature control adjustment assembly and the valve plate when the valve plate is in the cut-off position according to one embodiment of this application;

[0028] Figure 6 This is a cross-sectional view of a cyclone separator according to one embodiment of this application.

[0029] List of components and reference numerals:

[0030] 1. Blast furnace;

[0031] 2. First water transmission pipeline; 21. First section; 22. Second section;

[0032] 3 heat exchange units;

[0033] 4 water storage tanks;

[0034] 5RO permeation module;

[0035] 6. Second water transmission pipeline, 61. First section, 62. Second section;

[0036] 7 Temperature-controlled deformation mechanism, 71 Temperature-controlled deformation component, 711 First metal sheet, 712 Second metal sheet, 72 Connecting rod;

[0037] 8. Valve plate; 81. Second flow hole; 82. Protrusion.

[0038] 9. Flow plates;

[0039] 10 elastic reset components;

[0040] 110 three-way solenoid valve;

[0041] 120 Third Water Supply Pipeline;

[0042] 130 temperature detector;

[0043] 140 controller;

[0044] 150 hydrocyclone separator, 1501 tube body, 1502 separation chamber, 1503 overflow pipe, 1504 slag discharge port;

[0045] 160 slag receiving bin;

[0046] 170 booster pump. Detailed Implementation

[0047] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] like Figures 1 to 6As shown, a waste heat demineralized water system for blast furnace 1 includes a blast furnace 1, a first water supply pipe 2 connected to the drain outlet of the blast furnace 1, a heat exchange unit 3, and a demineralized water unit. The heat exchange unit 3 is used to receive the heat from the slag flushing water in the first water supply pipe 2 and transfer the heat to the demineralized water unit. The demineralized water unit includes a water storage tank 4 and an RO permeation component 5. The water storage tank 4 is used to store raw water, and the outlet of the water storage tank 4 is connected to the heat exchange unit 3 and the RO permeation component 5 in sequence through a second water supply pipe 6. A temperature control regulating component is provided between the heat exchange unit 3 and the RO permeation component 5 in the second water supply pipe 6. The temperature control regulating component includes a temperature control deformation mechanism 7 and a valve plate 8 disposed inside the second water supply pipe 6. The temperature control deformation mechanism 7 deforms according to temperature changes. When the brine temperature in the second water supply pipe 6 reaches or exceeds a preset temperature, the temperature control deformation mechanism 7 drives the valve plate 8 to move to cut off the second water supply pipe 6.

[0053] The waste heat demineralized water system for blast furnace 1 in this application connects the outlet of blast furnace 1 to heat exchange unit 3 via a first water supply pipe 2, and supplies high-temperature slag flushing water to the heat input end of heat exchange unit 3. The heat is then exchanged with the second water supply pipe 6, which is connected to the heat output end of heat exchange unit 3. The water storage tank 4 supplies raw water to the RO permeation component 5 via the second water supply pipe 6. After being heated by heat exchange unit 3, the temperature of the raw water increases. The preheated raw water can pass through the RO membrane in RO permeation component 5 with a faster filtration efficiency, thereby improving the filtration efficiency of the raw water. Furthermore, the second water supply pipeline 6 is equipped with a temperature control and regulation component between the heat exchange unit 3 and the RO permeation component 5. When the temperature of the flushing water is high or other factors cause the temperature of the raw water in the second water supply pipeline 6 to be higher than the preset temperature that may damage the RO membrane, the temperature control and regulation component automatically senses the temperature and drives the valve plate 8 to move to cut off the second water supply pipeline 6. This significantly reduces the probability of the RO membrane being damaged by heat due to excessively high raw water temperature, and provides a guarantee for the working stability and service life of the demineralized water system.

[0054] Specifically, the raw water that needs to be purified is placed in a water storage tank. The RO permeation component 5 includes an RO membrane. The second water supply pipe 6 delivers raw water to the RO membrane. The raw water gradually permeates the RO membrane under pressure. The RO membrane separates salts, organic matter, etc. in the raw water and supplies it with pure water of higher purity to achieve the purification of the raw water.

[0055] As a preferred embodiment of this application, such as Figures 2 to 5 As shown, the second water supply pipe 6 is provided with a flow plate 9 that abuts against the valve plate 8. The flow plate 9 has a first flow hole, and the valve plate 8 has a second flow hole 81. The valve plate 8 has a flow position that aligns and connects the first flow hole and the second flow hole 81, and a cut-off position that misaligns the first flow hole and the second flow hole 81. The temperature control deformation mechanism 7 drives the valve plate 8 to move from the flow position to the cut-off position to cut off the second water supply pipe 6.

[0056] Through the contact and cooperation between the flow plate 9 and the valve plate 8, a continuous flow path is formed when the first flow hole of the flow plate 9 and the second flow hole 81 of the valve plate 8 are aligned and connected. When misaligned, a physical hard seal is formed to cut off the water flow. The second water supply pipe 6 is cut off through the response and cooperation of the mechanical structure, which not only has a high temperature response rate, but also has high working stability.

[0057] As a preferred embodiment of this implementation, the inner wall of the second water supply pipe 6 is provided with a sliding groove, the valve plate 8 is circular and partially located in the sliding groove, and the valve plate 8 slides in the sliding groove to switch between the cut-off position and the flow position.

[0058] When the water temperature in the second water supply pipe 6 is equal to or higher than the preset temperature, the temperature control deformation mechanism 7 drives the valve plate 8 to precisely translate along the pipe axis within the sliding groove, causing the second flow hole 81 on the valve plate 8 to be completely misaligned with the first flow hole of the flow plate 9. At this time, the solid part of the valve plate 8 completely covers the first flow hole to form a physical isolation barrier, completely cutting off the second water supply pipe 6. This mechanical switching mechanism does not require external energy to drive it; it achieves the "full flow - full closure" state transition solely through structural displacement. While ensuring daily operating efficiency, it establishes a reliable overheat protection system for the RO membrane.

[0059] As a preferred example in this embodiment, such as Figures 2 to 5 As shown, the temperature-controlled deformation mechanism 7 includes a temperature-controlled deformation component 71 and a connecting rod 72. The temperature-controlled deformation component 71 is composed of two mutually attached first metal sheets 711 and second metal sheets 712. The thermal expansion coefficient of the first metal sheet 711 is greater than that of the second metal sheet 712. The temperature-controlled deformation component 71 has a fixed end connected to the inner wall of the second water supply pipe 6 and a free end located away from the fixed end. When the temperature-controlled deformation component 71 heats up, the first metal sheet 711 bends towards the second metal sheet 712 and drives the valve plate 8 to switch from the flow position to the cut-off position through the connecting rod 72.

[0060] Two metal sheets, 711 and 712, with different coefficients of thermal expansion, are combined to form a temperature-controlled deformable component 71. The two metal sheets are tightly joined at the fixed end, while the free end remains movable. When the temperature of the flowing raw water increases, the first metal sheet 711, with its high coefficient of thermal expansion, undergoes directional bending deformation towards the second metal sheet 712, which has a low coefficient of thermal expansion. This deformation process relies entirely on the thermodynamic properties of the first metal sheet 711 and the second metal sheet 712 themselves, requiring no external sensing elements. When the water temperature reaches a preset critical point, the bending displacement of the free end is transmitted to the actuator through a rigid connecting rod 72. The connecting rod 72 acts on the protrusion 82 of the valve plate 8, converting the bending motion of the first metal sheet 711 and the second metal sheet 712 into the displacement of the valve plate 8, thereby enabling the valve plate 8 to quickly cut off the second water supply pipe 6.

[0061] As an example, a preferred approach is as follows: Figures 2 to 5 As shown, the valve plate 8 is provided with an outwardly protruding part 82, and the connecting rod 72 acts on the protruding part 82 to drive the valve plate 8 to rotate; the temperature control deformation mechanism also includes an elastic reset member 10, one end of which is fixedly connected to the inner wall of the second water supply pipe 6, and the other end abuts against the protruding part 82, so that when the connecting rod 72 removes the force applied to the protruding part 82, the elastic reset member 10 abuts against the valve plate 8 to rotate from the cut-off position to the flow position.

[0062] A protruding portion 82 is specially provided on the valve plate 8 as the force application point of the transmission rod. The end of the connecting rod 72 is movably connected to the protruding portion 82, accurately transmitting the mechanical displacement generated by the temperature control deformation component 71 to the valve plate 8. When the water temperature drops back to a safe range, the pre-compressed elastic reset component 10 releases its stored energy, and its end continuously abuts against the protruding portion 82, applying a reset thrust. This elastic force pushes the protruding portion 82 to drive the valve plate 8 to move in the opposite direction, causing the valve plate 8 to move to the flow position. The design of the elastic reset component 10 enables the valve plate 8 to automatically reset, completing the position restoration of the valve plate 8 without manual intervention.

[0063] Preferably, the connecting rod 72 and the protrusion 82 of the valve plate 8 are hinged. After the water temperature recovers, the temperature-sensing deformation member returns to its original position, and the connecting rod 72 synchronously drives the valve plate 8 to move. That is, the valve plate 8 returns to the flow position from the cut-off position under the combined action of the elastic reset member 10 and the connecting rod 72. This design can also maintain the positional stability of the valve plate 8 by the joint action of the connecting rod 72 and the elastic reset member 10 on the protrusion 82 when the water temperature is lower than the preset temperature, ensuring the stable alignment of the first flow hole and the second flow hole 81.

[0064] As a preferred embodiment of this application, such as Figure 1As shown, the second water supply pipe 6 is equipped with a three-way solenoid valve 110 in the part between the heat exchange unit 3 and the RO permeation component 5. The three-way solenoid valve 110 has a first inlet, a second inlet and an outlet. The second water supply pipe 6 includes a first section 61 connecting the heat exchange unit 3 and the first inlet and a second section 62 connecting the outlet and the RO permeation component 5. The water storage tank 4 is connected to the second inlet through a third water supply pipe. The demineralized water system also includes a temperature detector 130 and a controller 140 located in the first section 61. The temperature detector 130 can detect the temperature of the first section 61. When the temperature is equal to or higher than the preset temperature, the controller 140 controls the second inlet to open. When the temperature is lower than the preset temperature, the controller 140 controls the second inlet to close.

[0065] A three-way solenoid valve 110 is installed as a control node in the pipe section between heat exchange unit 3 and RO permeation component 5. This valve has independent first and second inlets. The first inlet is directly connected to the outlet of heat exchange unit 3, and the second inlet is connected to a low-temperature raw water source via a third water supply pipe 120. When the temperature detector 130 detects that the water temperature is approaching a critical value, the controller 140 sends a command to the three-way solenoid valve 110 to open the second inlet channel. At this time, low-temperature raw water is injected into the valve chamber through the second inlet and rapidly mixed with the preheated raw water from the first inlet. By adjusting the hot and cold water mixing ratio, the upward trend of water temperature can be effectively suppressed. If the temperature rise continues and reaches the preset upper temperature limit, the temperature control deformation mechanism 7 automatically cuts off the water flow. This design constructs a temperature gradient control system: low-temperature mixing water acts as the first line of defense against high-temperature shocks, while the temperature control adjustment component acts as the final guarantee, activating immediately when the temperature exceeds the preset temperature. This dual-stage synergy significantly improves the system's protection reliability.

[0066] In addition, this configuration can improve the adaptability of the demineralized water system to changes in the temperature of the flushing water, reduce the duration of raw water filtration interruption caused by the disconnection of the second water supply pipe 6, and help improve the continuity of the demineralized water system.

[0067] As a preferred embodiment of this application, such as Figure 1 , Figure 6 As shown, the first water supply pipeline 2 is connected to the water inlet of the blast furnace 1 after passing through the heat exchange unit 3. The first water supply pipeline 2 includes a first section 21 connecting the water outlet of the blast furnace 1 and the heat exchange unit 3, and a second section 22 connecting the heat exchange unit 3 and the water inlet of the blast furnace 1. The first section 21 is equipped with a hydrocyclone separator 150, which is used to separate the solid waste of the slag flushing water in the first water supply pipeline 2.

[0068] Preferably, such as Figure 6As shown, the cyclone separator 150 includes a tube body 1501, which is hollow inside to form a separation chamber 1502. The tube body 1501 is inverted conical in shape and has an inlet on its side. The cyclone separator 150 also includes an overflow pipe 1503, one end of which is located inside the separation chamber 1502 and the other end extends vertically. The inlet and the overflow pipe 1503 are respectively connected to the first section 21.

[0069] The hydrocyclone separator 150 guides the flushing water to form a high-speed rotating flow field through an inverted conical tube 1501 structure. The inverted conical design of the tube 1501 generates a strong centrifugal force field during fluid flow. High-density solid particles are thrown towards the tube wall under centrifugal force and gradually settle along the conical surface. The purified liquid flows upward through the central region. This device is located upstream of the heat exchange unit 3, effectively intercepting solid impurities that may clog the heat exchange channels. The solid content of the separated flushing water is significantly reduced, ensuring the heat transfer efficiency and equipment safety of subsequent heat exchange processes.

[0070] Figure 6 The spiral curve with the arrow in the middle represents the flow path of the slag flushing water.

[0071] Furthermore, such as Figure 6 As shown, the hydrocyclone separator 150 is provided with a slag receiving bin 160 at the bottom, and the tube body 1501 is provided with a slag discharge port 1504 at the bottom, which is connected to the slag receiving bin 160.

[0072] A slag receiving bin 160 is configured at the bottom of the hydrocyclone separator 150, which is directly connected to the slag discharge port 1504 at the bottom of the tube body 1501. The separated solid waste falls into the slag receiving bin 160 through the slag discharge port 1504 under the action of gravity. The slag receiving bin 160 adopts a detachable sealing design, which not only ensures the airtightness of the separation process, but also facilitates regular cleaning, realizing the continuous discharge and centralized storage of the separated materials.

[0073] Preferably, the preset temperature is between 38°C and 40°C.

[0074] The preset temperature is limited to the range of 38℃ to 40℃ to ensure that the RO membrane is in a better active state and that the water molecule permeation rate reaches the ideal level; the upper limit of 40℃ is set below the safety margin of the thermal damage critical value of the RO membrane material, so as to reserve sufficient response time for the protection mechanism.

[0075] Specifically, in this application, blast furnace 1 supplies slag flushing water to heat exchange unit 3 via the first water supply pipe 2. Heat exchange unit 3 can be a shell-and-tube heat exchanger or a plate heat exchanger. After flowing through heat exchange unit 3, the slag flushing water is returned to blast furnace 1 for recycling. Preferably, a cooling tower can be installed between the heat exchanger and the blast furnace 1 inlet to further cool the slag flushing water before it flows back to blast furnace 1. Preferably, booster pumps 170 are installed in the first water supply pipe 2, the second water supply pipe 6, and the third water supply pipe 120 to increase the kinetic energy of the slag flushing water and raw water.

[0076] It should be noted that the arrows in the first water supply pipe 2, the second water supply pipe 6, and the third water supply pipe 120 indicate the direction of movement of the flushing water or raw water.

[0077] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0078] 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.

[0079] 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 waste heat demineralization system for blast furnace slag flushing water, characterized in that, The system includes a blast furnace, a first water supply pipe connected to the drain outlet of the blast furnace, a heat exchange unit, and a demineralized water unit; the heat exchange unit is used to receive the heat from the slag flushing water in the first water supply pipe and transfer the heat to the demineralized water unit. The demineralized water unit includes a water storage tank and an RO permeation module. The water storage tank is used to store raw water, and the outlet of the water storage tank is connected to the heat exchange unit and the RO permeation module in sequence through a second water supply pipe. The second water supply pipeline is provided with a temperature control and adjustment component between the heat exchange unit and the RO permeation component. The temperature control and adjustment component includes a temperature control deformation mechanism and a valve plate disposed inside the second water supply pipeline. The temperature control deformation mechanism deforms in response to temperature changes. When the temperature of the brine in the second water supply pipeline reaches or exceeds a preset temperature, the temperature control deformation mechanism drives the valve plate to move to cut off the second water supply pipeline.

2. The demineralized water system according to claim 1, characterized in that, The second water supply pipe is provided with a flow plate that abuts against the valve plate. The flow plate has a first flow hole, and the valve plate has a second flow hole. The valve plate has a flow position that aligns and connects the first flow hole and the second flow hole, and a cut-off position that misaligns the first flow hole and the second flow hole. The temperature control deformation mechanism drives the valve plate to move from the flow position to the cut-off position to cut off the second water supply pipe.

3. The demineralized water system according to claim 2, characterized in that, The inner wall of the second water supply pipe is provided with a sliding groove, and the valve plate is circular and partially located in the sliding groove. The valve plate slides in the sliding groove to switch between the cut-off position and the flow position.

4. The demineralized water system according to claim 3, characterized in that, The temperature-controlled deformation mechanism includes a temperature-controlled deformation component and a connecting rod. The temperature-controlled deformation component consists of two mutually fitted first metal sheets and a second metal sheet. The thermal expansion coefficient of the first metal sheet is greater than that of the second metal sheet. The temperature-controlled deformation component has a fixed end connected to the inner wall of the second water supply pipe and a free end located away from the fixed end. When the temperature-controlled deformation component heats up, the first metal sheet bends towards the second metal sheet, and the connecting rod drives the valve plate to switch from the flow position to the cut-off position.

5. The demineralized water system according to claim 4, characterized in that, The valve plate has an outwardly protruding part, and the connecting rod acts on the protruding part to drive the valve plate to rotate; the temperature control deformation mechanism also includes an elastic reset member, one end of which is fixedly connected to the inner wall of the second water supply pipe, and the other end abuts against the protruding part, so that when the connecting rod removes the force applied to the protruding part, the elastic reset member abuts against the valve plate to rotate from the cut-off position to the flow position.

6. The demineralized water system according to claim 1, characterized in that, The second water supply pipeline is equipped with a three-way solenoid valve in the section between the heat exchange unit and the RO permeation component. The three-way solenoid valve has a first inlet, a second inlet, and an outlet. The second water supply pipeline includes a first section connecting the heat exchange unit and the first inlet, and a second section connecting the outlet and the RO permeation component. The water storage tank is connected to the second inlet through a third water supply pipeline. The demineralized water system also includes a temperature detector and a controller located in the first section. The temperature detector can detect the temperature of the first section. When the temperature is equal to or higher than a preset temperature, the controller controls the second inlet to open. When the temperature is lower than the preset temperature, the controller controls the second inlet to close.

7. The demineralized water system according to claim 1, characterized in that, The first water supply pipeline is connected to the water inlet of the blast furnace after passing through the heat exchange unit. The first water supply pipeline includes a first section connecting the water outlet of the blast furnace and the heat exchange unit, and a second section connecting the heat exchange unit and the water inlet of the blast furnace. The first section is equipped with a hydrocyclone separator, which is used to separate the solid waste of the slag flushing water in the first water supply pipeline.

8. The demineralized water system according to claim 7, characterized in that, The cyclone separator includes a tube body, the interior of which is hollow to form a separation chamber. The tube body is inverted conical in shape and has an inlet on its side. The cyclone separator also includes an overflow pipe, one end of which is located inside the separation chamber and the other end extends vertically. The inlet and the overflow pipe are respectively connected to the first section.

9. The demineralized water system according to claim 8, characterized in that, The hydrocyclone separator is provided with a slag receiving bin at the bottom, and the tube body is provided with a slag discharge port at the bottom, which is connected to the slag receiving bin.

10. The demineralized water system according to claim 1, characterized in that, The preset temperature is between 38°C and 40°C.

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