Blast furnace slag flushing water waste heat circulating system for air dehumidification of hot blast stove

Abstract

The blast furnace slag flushing water waste heat circulation system comprises a blast furnace, the blast furnace is provided with an air inlet and a water outlet, and the blast furnace slag flushing water waste heat circulation system further comprises a cooling dehumidification unit, a lithium bromide refrigeration unit and a heat exchange unit; the water outlet communicates with the heat exchange unit through a water conveying pipeline and is used for transferring waste heat of the slag flushing water to the heat exchange unit. The lithium bromide refrigeration unit communicates with the heat exchange unit through a heat exchange pipeline, and the lithium bromide refrigeration unit produces a cooling medium through heat of the heat exchange unit. The lithium bromide refrigeration unit is connected with the cooling dehumidification unit; the cooling dehumidification unit is provided with an air inlet and a dry air outlet, and the dry air outlet communicates with an air inlet of the blast furnace and is used for conveying air dried by the cooling medium to the blast furnace. The air is cooled and dehumidified through the cooling medium generated by the lithium bromide refrigeration unit, and the dried air is directly conveyed to the blast furnace, so that the use of traditional drying equipment is avoided, and the energy consumption and the operation cost are remarkably reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of blast furnace heat energy recycling, and particularly relates to a blast furnace slag flushing water waste heat recycling system for hot blast stove air dehumidification. BACKGROUND

[0002] In the process of blast furnace steelmaking, hot blast stoves need to deliver high-temperature dry air to the blast furnace to maintain a high-temperature environment and chemical reactions in the furnace. However, the dry air required by the blast furnace usually needs to be processed by additional drying equipment, which not only has high energy consumption but also increases the complexity and operating cost of the system. At the same time, a large amount of high-temperature slag flushing water is generated during the blast furnace steelmaking process, which is usually directly discharged or recycled after simple cooling, and the waste heat carried by it cannot be effectively utilized, resulting in waste of energy.

[0003] Currently, the waste heat recycling efficiency of blast furnace slag flushing water is low, and the main reasons include:

[0004] Limited heat transfer efficiency of traditional heat exchangers: The existing waste heat recovery technology usually uses ordinary heat exchangers, which have low heat transfer efficiency and are difficult to fully recover the waste heat of slag flushing water.

[0005] Single energy utilization mode: The existing technology usually uses the waste heat of slag flushing water for power generation or heating, and fails to combine it with other needs in the blast furnace steelmaking process, resulting in limitations of energy utilization.

[0006] Complex system and high cost: In order to realize waste heat recovery, the existing technology usually needs additional power equipment (such as pumps, fans, etc.), which increases the complexity and operating cost of the system.

[0007] In addition, due to the need for continuous injection of high-temperature dry air during blast furnace steelmaking, traditional blast furnace air drying technology usually needs to use additional drying equipment (such as electric heating or steam heating dryers), which not only has high energy consumption but also increases the operating cost and maintenance difficulty of the system. Therefore, how to efficiently recover the waste heat of blast furnace slag flushing water and use it for drying the air of the blast furnace has become a technical problem to be solved. CONTENT OF THE INVENTION

[0008] The application provides a blast furnace slag flushing water waste heat recycling system for hot blast stove air dehumidification to solve the technical problems of low blast furnace waste heat utilization efficiency and high cost of delivering hot air to the blast furnace.

[0009] The technical solution adopted by the application is:

[0010] The application discloses a blast furnace slag flushing water waste heat recycling system for hot blast furnace air dehumidification.

[0011] The blast furnace slag flushing water waste heat recycling system further comprises the following additional technical features.

[0012] The heat exchange unit comprises a first heat exchange cavity, a second heat exchange cavity and a heat pipe group, the first heat exchange cavity and the second heat exchange cavity are respectively filled with heat exchange medium, the water pipeline extends into the first heat exchange cavity and is in contact with the heat exchange medium, the heat exchange pipeline extends into the second heat exchange cavity and is in contact with the heat exchange medium, and the two ends of the heat pipe group are respectively in contact with the heat exchange medium in the first heat exchange cavity and the heat exchange medium in the second heat exchange cavity.

[0013] The heat pipe group comprises a plurality of parallel heat exchange pipes, and the two ends of each heat exchange pipe are respectively immersed in the heat exchange medium in the first heat exchange cavity and the second heat exchange cavity.

[0014] The heat exchange pipe is internally hollow to form a heat transfer cavity, and the heat transfer cavity is provided with heat conduction medium.

[0015] A heating furnace is arranged between the cooling and dehumidifying unit and the blast furnace, the heating furnace receives air from the cooling and dehumidifying unit, heats the air and then delivers the heated air to the air inlet of the blast furnace.

[0016] The water pipeline is provided with a flow control valve, the flow control valve can adjust the size of a valve port according to the temperature of the slag flushing water, the valve port is reduced with the increase of the water temperature and is increased with the decrease of the water temperature, so that the stability of the delivery of the slag flushing water heat to the heat exchange unit is maintained.

[0017] The flow control valve comprises a valve body, a valve core, an expansion cavity and a piston rod connected with the expansion cavity; the valve body is internally provided with a flow channel, the flow channel is communicated with the water conveying pipeline; the valve core is movably arranged in the flow channel and is used for adjusting the sectional area of the flow channel; the valve core has a first movement direction for reducing the sectional area of the flow channel and a second movement direction for increasing the sectional area of the flow channel; the expansion cavity is expanded or shrunk due to temperature change, so as to drive the valve core to move along the first movement direction or the second movement direction through the piston rod.

[0018] The expansion cavity is internally provided with a liquid medium, one end of the expansion cavity is provided with a flexible diaphragm, the flexible diaphragm is connected with the piston rod, and the flexible diaphragm is expanded or shrunk by the liquid medium, so as to drive the valve core to move through the piston rod.

[0019] Due to the adoption of the above technical scheme, the application has the following beneficial effects:

[0020] 1. The present application provides a blast furnace slag flushing water waste heat recycling system for hot blast stove air dehumidification, which realizes efficient recovery and utilization of slag flushing water waste heat by transferring the waste heat of blast furnace slag flushing water to a heat exchange unit and converting the waste heat into cooling medium by a lithium bromide refrigeration unit. The waste heat of traditional blast furnace slag flushing water is usually directly discharged or simply cooled and recycled, resulting in a large amount of energy waste. The cooling medium generated by the lithium bromide refrigeration unit in the present application cools and dehumidifies the air, and the dried air is directly delivered to the blast furnace, avoiding the use of traditional drying equipment and significantly reducing energy consumption and operating cost. In addition, the system integrates blast furnace slag flushing water waste heat recovery, lithium bromide refrigeration and air dehumidification functions in one, has compact structure, stable operation, reduces the floor area and maintenance difficulty of the equipment, and significantly reduces carbon emissions and energy consumption in the blast furnace steelmaking process through efficient energy conversion and utilization, meeting the requirements of green manufacturing and sustainable development.

[0021] In addition, the present application integrates blast furnace slag flushing water waste heat recovery, lithium bromide refrigeration and air dehumidification functions in one, and the system has compact structure and stable operation. Through the cooperative work of the heat exchange unit and the lithium bromide refrigeration unit, efficient energy conversion and utilization can be realized, and the floor area and maintenance difficulty of the equipment can be reduced. By recycling the waste heat of blast furnace slag flushing water and reducing the use of traditional drying equipment, the present application significantly reduces carbon emissions and energy consumption in the blast furnace steelmaking process, meeting the requirements of green manufacturing and sustainable development.

[0022] 2. As a preferred embodiment of the present application, the heat exchange unit includes a first heat exchange chamber, a second heat exchange chamber, and a heat pipe group. This design can efficiently transfer the residual heat of the slag flushing water. The two ends of the heat pipe group are in contact with the heat exchange medium of the first and second heat exchange chambers, respectively. By utilizing the high-efficiency heat transfer characteristics of the heat pipe, the heat exchange efficiency is significantly improved, ensuring that the residual heat of the slag flushing water can be fully transferred to the lithium bromide refrigeration unit. The first and second heat exchange chambers are in communication with the water conveying pipeline and the heat exchange pipeline, respectively, forming independent heat exchange circuits, avoiding energy loss during heat transfer, and enhancing the stability and reliability of the system. In addition, the heat exchange unit can be made of high-temperature-resistant and corrosion-resistant materials (such as stainless steel), which can adapt to the high-temperature environment of the blast furnace slag flushing water, ensuring long-term stable operation of the system under harsh working conditions. At the same time, through compact structural design, the land occupation and installation difficulty of the equipment are reduced, and the maintenance cost of the system is reduced.

[0023] 3. As a preferred embodiment of the present application, multiple parallel heat exchange pipes are used. This design can uniformly distribute heat, avoid local overheating or uneven heat transfer, and ensure the stability and efficiency of the heat exchange process. The design of multiple heat exchange pipes improves the redundancy of the system, so that even if some heat exchange pipes fail, the system can still operate normally, enhancing the reliability and durability of the system. In addition, the design of multiple heat exchange pipes can adapt to the high-flow slag flushing water working condition, ensuring efficient heat transfer under high load conditions, further improving the applicability and operating efficiency of the system.

[0024] 4. As a preferred embodiment of the present application, the heat exchange pipe is hollow inside to form a heat transfer chamber and is filled with a heat-conducting medium. This design can significantly improve the heat transfer efficiency, ensuring rapid and uniform heat transfer. At the same time, through the selection of the heat-conducting medium, it can be adjusted according to the specific working conditions, such as selecting a high-temperature-resistant heat-conducting medium in a high-temperature environment, ensuring the adaptability of the system under different working conditions. In addition, the internal structure design of the heat exchange pipe simplifies the manufacturing process, reduces production costs, and improves the reliability and durability of the system.

[0025] 5. As a preferred embodiment of the present application, the heating furnace can heat the air output by the cooling and dehumidifying unit to a suitable temperature, ensuring that the air delivered to the blast furnace meets the process requirements. This design not only increases the temperature of the air, but also enhances the flexibility of the system, allowing the system to flexibly adjust the air temperature according to the actual needs of the blast furnace, improving the applicability and operation convenience of the system. In addition, the use of the heating furnace avoids the use of traditional drying equipment, further reducing the energy consumption and operating cost of the system. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0027] Figure 1 A schematic diagram of a blast furnace slag water waste heat recycling system for hot blast stove air dehumidification according to an embodiment of the application;

[0028] Figure 2 A schematic diagram of a heat exchange unit according to an embodiment of the application;

[0029] Figure 3 A sectional view of a heat exchange unit according to an embodiment of the application;

[0030] Figure 4 A sectional view of a flow regulating valve according to an embodiment of the application.

[0031] List of components and reference numerals:

[0032] 1 blast furnace, 11 air inlet, 12 water outlet, 13 water inlet;

[0033] 2 cooling and dehumidifying unit;

[0034] 3 lithium bromide refrigeration unit;

[0035] 4 heat exchange unit, 41 first heat exchange cavity, 42 second heat exchange cavity, 43 heat pipe group, 431 heat exchange pipe;

[0036] 5 water conveying pipeline;

[0037] 6 heat exchange pipeline;

[0038] 7 heating furnace;

[0039] 8 flow control valve, 81 valve body, 811 valve port, 812 flow channel, 82 valve core, 83 expansion cavity, 831 flexible diaphragm, 84 piston rod;

[0040] 9 cooling tower;

[0041] 10 cooling pond;

[0042] 110 slag water separation tank;

[0043] 120 booster pump. DETAILED DESCRIPTION

[0044] In order to more clearly illustrate the overall concept of the application, the following will be described in detail with reference to the accompanying drawings.

[0045] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced without the specific details. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the present application. It can be understood that the embodiments of the present application and the characteristics of the embodiments can be combined with each other under the condition of no conflict.

[0046] In addition, in the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0047] In the present application, unless specifically defined and limited otherwise, the terms "mount", "connect", "connection", "fixed", and the like are to be broadly understood, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection, and can also be communication; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. In the description of the specification, the description referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] As Figures 1 to 4As shown, a blast furnace slag water waste heat recycling system for hot blast furnace air dehumidification includes a blast furnace 1, the blast furnace 1 is provided with an air inlet 11 for conveying hot air and a water outlet 12 for discharging slag water, and further includes a cooling and dehumidifying unit 2, a lithium bromide refrigeration unit 3 and a heat exchange unit 4; the water outlet 12 is communicated with the heat exchange unit 4 through a water conveying pipeline 5, for transferring the waste heat of the slag water to the heat exchange unit 4; the lithium bromide refrigeration unit 3 is communicated with the heat exchange unit 4 through a heat exchange pipeline 6, and the lithium bromide refrigeration unit 3 produces cooling medium by the heat of the heat exchange unit 4; the lithium bromide refrigeration unit 3 is connected with the cooling and dehumidifying unit 2, for conveying the cooling medium to the cooling and dehumidifying unit 2; the cooling and dehumidifying unit 2 is provided with an air inlet and a dry air outlet, the dry air outlet is communicated with the air inlet 11 of the blast furnace 1, for conveying the air dried by the cooling medium to the blast furnace 1.

[0050] The present application provides a blast furnace slag water waste heat recycling system for hot blast furnace air dehumidification, by transferring the waste heat of the blast furnace slag water to the heat exchange unit 4, and converting the waste heat into cooling medium by the lithium bromide refrigeration unit 3, the efficient recovery and utilization of the waste heat of the slag water is realized. The waste heat of the traditional blast furnace slag water is usually directly discharged or simply cooled and recycled, resulting in a large amount of energy waste, while the present application cools and dehumidifies the air by the cooling medium produced by the lithium bromide refrigeration unit 3, and directly conveys the dried air to the blast furnace 1, avoiding the use of traditional drying equipment, significantly reducing energy consumption and operating cost. In addition, the system integrates the functions of blast furnace slag water waste heat recovery, lithium bromide refrigeration and air dehumidification, has compact structure, stable operation, reduces the floor area and maintenance difficulty of the equipment, and significantly reduces the carbon emission and energy consumption of the steelmaking process of the blast furnace 1, meeting the requirements of green manufacturing and sustainable development.

[0051] In addition, the present application integrates the functions of blast furnace slag water waste heat recovery, lithium bromide refrigeration and air dehumidification, the system has compact structure and stable operation. Through the cooperative work of the heat exchange unit 4 and the lithium bromide refrigeration unit 3, the efficient conversion and utilization of energy can be realized, and the floor area and maintenance difficulty of the equipment are reduced. By recycling the waste heat of the blast furnace slag water and reducing the use of traditional drying equipment, the present application significantly reduces the carbon emission and energy consumption of the steelmaking process of the blast furnace 1, meeting the requirements of green manufacturing and sustainable development.

[0052] Specifically, the lithium bromide refrigeration unit 3 is an absorption refrigeration system, whose working principle is based on the absorption and release process of water vapor by lithium bromide solution. The specific steps are as follows:

[0053] The process of generating: the heat exchange unit 4 transfers the waste heat of the slag water to the generator of the lithium bromide refrigeration unit 3, the lithium bromide dilute solution in the generator is heated, water vapor is released from the solution, and the solution becomes concentrated.

[0054] Condensation process: The released water vapor enters the condenser and condenses into liquid water after cooling.

[0055] Evaporation process: The liquid water enters the evaporator and evaporates under low pressure, absorbing heat and generating cold energy.

[0056] Absorption process: The evaporated water vapor is absorbed by the concentrated lithium bromide solution in the absorber, the solution becomes diluted, and the cycle is completed.

[0057] Preferably, the cooling medium can be water or other suitable refrigerants. In this application, water is preferred as the cooling medium because it has a high specific heat capacity and good heat transfer performance, and is low in cost and easy to obtain.

[0058] As a preferred embodiment of the present application, as shown in Figure 2 , Figure 3 The heat exchange unit 4 includes a first heat exchange chamber 41, a second heat exchange chamber 42, and a heat pipe group 43. The first heat exchange chamber 41 and the second heat exchange chamber 42 are respectively filled with heat exchange medium, the water supply pipeline 5 extends into the first heat exchange chamber 41 and contacts with the heat exchange medium, the heat exchange pipeline 6 extends into the second heat exchange chamber 42 and contacts with the heat exchange medium, and the two ends of the heat pipe group 43 respectively contact with the heat exchange medium in the first heat exchange chamber 41 and the heat exchange medium in the second heat exchange chamber 42.

[0059] The heat exchange unit 4 includes a first heat exchange chamber 41, a second heat exchange chamber 42, and a heat pipe group 43. This design can efficiently transfer the residual heat of the slag flushing water. The two ends of the heat pipe group 43 respectively contact with the heat exchange medium in the first heat exchange chamber 41 and the second heat exchange chamber 42. By utilizing the high-efficiency heat transfer characteristics of the heat pipe, the heat exchange efficiency is significantly improved, ensuring that the residual heat of the slag flushing water can be fully transferred to the lithium bromide refrigeration unit 3. The first heat exchange chamber 41 and the second heat exchange chamber 42 are respectively connected with the water supply pipeline 5 and the heat exchange pipeline 6, forming independent heat exchange circuits, avoiding energy loss during heat transfer, and enhancing the stability and reliability of the system. In addition, the heat exchange unit 4 can be made of high-temperature-resistant and corrosion-resistant materials (such as stainless steel), which can adapt to the high-temperature environment of the blast furnace slag flushing water, ensuring long-term stable operation of the system under harsh working conditions. At the same time, through compact structural design, the land occupation and installation difficulty of the equipment are reduced, and the maintenance cost of the system is reduced.

[0060] The heat exchange medium can be water, heat-conducting oil, or other suitable heat transfer medium. In this application, water is preferred as the heat exchange medium because it has a high specific heat capacity and good heat transfer performance.

[0061] As a preferred embodiment of the present embodiment, as shown in Figure 2As shown, the heat pipe group 43 includes multiple parallel heat exchange pipes 431, with both ends of each heat exchange pipe 431 immersed in the heat exchange medium of the first heat exchange cavity 41 and the second heat exchange cavity 42, respectively.

[0062] Multiple parallel heat exchange pipes 431 are used. This design can uniformly distribute heat, avoid local overheating or uneven heat transfer, and ensure the stability and efficiency of the heat exchange process. The design of multiple heat exchange pipes 431 improves the redundancy of the system, so that even if some heat exchange pipes 431 fail, the system can still operate normally, enhancing the reliability and durability of the system. In addition, the design of multiple heat exchange pipes 431 can adapt to the large flow of slag flushing water conditions, ensuring efficient heat transfer under high load conditions, further improving the applicability and operating efficiency of the system.

[0063] The material of the heat exchange pipe 431 is not limited in this embodiment, which can use copper alloy pipe, stainless steel pipe, etc.

[0064] As a preferred example under this embodiment, the heat exchange pipe 431 is hollow inside to form a heat transfer cavity, and the heat transfer cavity has a heat conducting medium. The heat exchange pipe 431 is hollow inside to form a heat transfer cavity and filled with a heat conducting medium. This design can significantly improve the heat transfer efficiency, ensuring rapid and uniform heat transfer, and through the selection of the heat conducting medium, it can be adjusted according to the specific working conditions, such as selecting a high-temperature-resistant heat conducting medium in a high-temperature environment, ensuring the adaptability of the system under different working conditions. In addition, the internal structure design of the heat exchange pipe 431 simplifies the manufacturing process, reduces production costs, and improves the reliability and durability of the system.

[0065] The heat conducting medium can be water, ethanol or other suitable heat conducting medium. In this application, water is preferably used as the heat conducting medium.

[0066] As a preferred embodiment of the present application, as shown in Figure 1 A heating furnace 7 is provided between the cooling and dehumidifying unit 2 and the blast furnace 1, which receives air from the cooling and dehumidifying unit 2 and heats it before delivering it to the air inlet 11.

[0067] The heating furnace 7 can heat the air output by the cooling and dehumidifying unit 2 to an appropriate temperature, ensuring that the air delivered to the blast furnace 1 meets the process requirements. This design not only increases the temperature of the air, but also enhances the flexibility of the system, allowing the system to flexibly adjust the air temperature according to the actual needs of the blast furnace 1, improving the applicability and operation convenience of the system. In addition, the use of the heating furnace 7 avoids the use of traditional drying equipment, further reducing the energy consumption and operating cost of the system.

[0068] As a preferred embodiment of the present application, as shown in Figure 1As shown, the water supply pipeline 5 is provided with a flow control valve 8, which can adjust the size of the valve port 811 according to the temperature of the deslagging water. The valve port 811 decreases with the increase of water temperature and increases with the decrease of water temperature, so as to maintain the stability of the heat delivered to the heat exchange unit 4.

[0069] The flow control valve 8 can automatically adjust the size of the valve port 811 according to the temperature of the deslagging water, ensuring the stability of the heat received by the heat exchange unit 4 and avoiding the instability of the system caused by temperature fluctuations. By automatically adjusting the flow of deslagging water, the flow control valve 8 can optimize the heat input and improve the energy utilization efficiency of the system. In addition, the setting of the flow control valve 8 enhances the degree of automation of the system, reduces the need for manual intervention, and reduces the operating cost and maintenance difficulty.

[0070] As a preferred embodiment under this embodiment, as shown in Figure 4 The flow control valve 8 includes a valve body 81, a valve core 82, an expansion cavity 83, and a piston rod 84 connected to the expansion cavity 83. The valve body 81 is provided with a flow channel 812 inside, which is in communication with the water supply pipeline 5. The valve core 82 is movably arranged in the flow channel 812 for adjusting the cross-sectional area of the flow channel 812. The valve core 82 has a first movement direction for reducing the cross-sectional area of the flow channel 812 and a second movement direction for increasing the cross-sectional area of the flow channel 812. The expansion cavity 83 expands or shrinks with temperature changes to drive the valve core 82 to move along the first movement direction or the second movement direction through the piston rod 84.

[0071] This design is simple and reliable, and is suitable for high-temperature and high-humidity industrial environments. The expansion cavity 83 can automatically adjust the position of the valve core 82 according to temperature changes, ensuring the accuracy and stability of flow control. In addition, the automatic adjustment function of the flow control valve 8 improves the response speed of the system, which can quickly adapt to changes in the temperature of the deslagging water and ensure the stable operation of the system.

[0072] It should be noted that the valve port 811 refers to the cross section of the flow channel 812 corresponding to the valve core 82. The movement of the valve core 82 increases or reduces the cross-sectional area of the flow channel 812, i.e., increases or reduces the cross-sectional area of the valve port 811.

[0073] As a preferred example under this embodiment, as shown in Figure 4 The expansion cavity 83 is provided with a liquid medium, and one end of the expansion cavity 83 is provided with a flexible diaphragm 831 connected to the piston rod 84. The flexible diaphragm 831 is expanded or contracted by the liquid medium to drive the valve core 82 to move through the piston rod 84.

[0074] The inflation cavity 83 is provided with a liquid medium, and one end of the inflation cavity 83 is provided with a flexible diaphragm 831. The flexible diaphragm 831 can effectively prevent the liquid medium from leaking, and ensure the long-term stable operation of the system. In addition, the flexible diaphragm 831 can quickly respond to temperature changes, and ensure the adjustment speed and accuracy of the flow control valve 8. This design not only improves the reliability of the system, but also simplifies the maintenance process and reduces the operation cost of the system.

[0075] Preferably, the liquid medium is water, which generates water vapor when heated, and the volume increases to drive the flexible diaphragm 831 to expand.

[0076] As a preferred embodiment of the present application, the blast furnace 1 also has a water inlet 13, and the water conveying pipeline 5 is communicated with the water inlet 13 after passing through the heat exchange unit 4, so as to inject the cooled slag flushing water into the blast furnace 1 through the water inlet 13 to realize the circulating slag flushing.

[0077] Preferably, the blast furnace slag flushing water waste heat circulation system of the present application further comprises a slag water separation tank 110, a cooling tower 9 and a cooling pool 10, and the flow control valve 8 is arranged between the cooling tower 9 and the heat exchange unit 4, and the flow control valve 8 is communicated with the cooling tower 9 and the heat exchange unit 4 respectively. The specific circulation process of the slag flushing water is as follows: after the slag flushing water flows out from the water outlet, it first passes through the slag water separation tank 110 to separate the slag in the slag flushing water, and then flows to the flow control valve 8, and the valve core 82 in the flow control valve 8 controls the size of the flow channel 812 according to different temperatures, and part of the slag flushing water flows into the heat exchange unit 4, and part of the slag flushing water enters the cooling tower 9 for cooling, the slag flushing water after passing through the heat exchange unit 4 flows into the cooling pool 10 for cooling, the slag flushing water after being cooled by the cooling tower 9 flows into the cooling pool 10 for secondary cooling, and the slag flushing water in the cooling pool 10 enters the water inlet 13 through the water conveying pipeline 5 for slag flushing, so as to realize the recycling of the slag flushing water. Figure 4 The path indicated by the arrow X is the flow path of the slag flushing water entering the heat exchange pipeline 6, and the path indicated by the arrow Y is the flow path of the slag flushing water entering the cooling tower 9.

[0078] Preferably, a booster pump 120 is arranged on the water conveying pipeline 5, the heat exchange pipeline 6 and other pipelines conveying the slag flushing water, so as to provide the slag flushing water with a movement power.

[0079] The parts not mentioned in the present application can be realized by using or referring to the existing technology.

[0080] Each embodiment in the present specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the differences from other embodiments.

[0081] The above merely provides an example of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the scope of claims of the present application.

Claims

1. A blast furnace slag flushing water waste heat recycling system for hot blast furnace air dehumidification, comprising a blast furnace provided with an air inlet for conveying hot air and a water outlet for discharging slag flushing water, characterized in that, The cooling and dehumidifying unit, the lithium bromide refrigeration unit and the heat exchange unit are further included; The water outlet is communicated with the heat exchange unit through a water pipeline, and is used for transferring the residual heat of the slag flushing water to the heat exchange unit; The lithium bromide refrigeration unit is communicated with the heat exchange unit through a heat exchange pipeline, and the lithium bromide refrigeration unit produces cooling medium through the heat of the heat exchange unit; The lithium bromide refrigeration unit is connected with the cooling and dehumidifying unit, and is used for delivering the cooling medium to the cooling and dehumidifying unit; The cooling and dehumidifying unit is provided with an air inlet and a dry air outlet, and the dry air outlet is communicated with the air inlet of the blast furnace, and is used for delivering the air dried by the cooling medium to the blast furnace.

2. The blast furnace slag flushing water residual heat circulation system according to claim 1, wherein the heat exchange unit comprises a first heat exchange cavity, a second heat exchange cavity and a heat pipe group, the first heat exchange cavity and the second heat exchange cavity are respectively filled with heat exchange medium, the water pipeline extends into the first heat exchange cavity and is in contact with the heat exchange medium, the heat exchange pipeline extends into the second heat exchange cavity and is in contact with the heat exchange medium, and the heat pipe group is in contact with the heat exchange medium in the first heat exchange cavity and the heat exchange medium in the second heat exchange cavity at two ends thereof.

3. The blast furnace slag flushing water residual heat circulation system according to claim 2, wherein the heat pipe group comprises a plurality of heat exchange pipes arranged in parallel, and two ends of each heat exchange pipe are respectively immersed in the heat exchange medium in the first heat exchange cavity and the second heat exchange cavity.

4. The blast furnace slag flushing water residual heat circulation system according to claim 3, wherein the heat exchange pipe is hollow inside to form a heat transfer cavity, and the heat transfer cavity has a heat conduction medium.

5. The blast furnace slag flushing water residual heat circulation system according to claim 1, wherein a heating furnace is arranged between the cooling and dehumidifying unit and the blast furnace, the heating furnace receives the air from the cooling and dehumidifying unit, heats the air and then delivers the heated air to the air inlet.

6. The blast furnace slag flushing water residual heat circulation system according to claim 1, wherein the water pipeline is provided with a flow control valve, the flow control valve can adjust the size of a valve port according to the temperature of the slag flushing water, the valve port is reduced with the increase of the water temperature and is increased with the decrease of the water temperature, so as to maintain the stability of the delivery of the residual heat of the slag flushing water to the heat exchange unit.

7. The blast furnace slag flushing water residual heat circulation system according to claim 6, wherein the flow control valve comprises a valve body, a valve core, an expansion cavity and a piston rod connected with the expansion cavity; the valve body is internally provided with a flow channel, and the flow channel is communicated with the water pipeline; the valve core is movably arranged in the flow channel, and is used for adjusting the cross-sectional area of the flow channel; the valve core has a first movement direction for reducing the cross-sectional area of the flow channel and a second movement direction for increasing the cross-sectional area of the flow channel; the expansion cavity expands or shrinks with the change of temperature, so as to drive the valve core to move along the first movement direction or the second movement direction through the piston rod.

8. The blast furnace slag flushing water residual heat circulation system according to claim 7, wherein ​ ​ ​ ​ ​ ​ The inflation cavity is provided with a liquid medium, one end of the inflation cavity is provided with a flexible diaphragm, the flexible diaphragm is connected with the piston rod, and the flexible diaphragm is expanded or contracted by the liquid medium, so as to drive the valve core to move through the piston rod.

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