A phase change cooling device for a blast furnace slag tapping trough and the blast furnace slag tapping trough

Abstract

An embodiment of the present invention provides a phase change cooling device for a blast furnace slag tapping trough and a blast furnace slag tapping trough. The phase change cooling device includes: a phase change unit, which is configured to be arranged on a side away from the inner surface of the slag tapping trough and is configured to be correspondingly distributed along the inner surface of the slag tapping trough. When slag is tapped, according to the present invention, based on a large amount of heat absorbed by the corresponding phase change material of the phase change unit during the phase change from solid phase to liquid phase, each area of the inner surface of the slag tapping trough can be rapidly cooled, so that the inner surface of the slag tapping trough is stably maintained at the slag hanging temperature, thereby facilitating the formation of stable slag hanging on the inner surface of the slag tapping trough, and a reliable protection for the slag tapping trough is formed by the slag skin of the slag hanging, thereby greatly improving the service life of the slag tapping trough.

Description

Technical Field

[0001] The present invention relates to the technical field of blast furnace ironmaking, and particularly relates to a phase change cooling device for a blast furnace slag tapping groove and a blast furnace slag tapping groove. Background Art

[0002] In the blast furnace ironmaking process, the blast furnace slag tapping groove is an important component structure in the blast furnace tapping platform. The slag tapping groove is mainly formed by casting or ramming with aluminum silicon carbide carbon refractory materials. In blast furnace ironmaking, the slag tapping groove is mainly used for the flow and transportation of silica slag (abbreviation: slag) after the separation of slag and iron in the large groove in front of the blast furnace hearth, and transports the slag from the large groove to the slag granulation groove, dry slag groove and dry slag tank. However, due to the very complex mineral composition of the slag, its main component is silicon dioxide, and it also contains various metal and non-metal oxides. Therefore, the slag tapping groove is easily severely damaged due to the erosion and mechanical scouring of the refractory material by the high-temperature slag, and it must be maintained regularly.

[0003] In order to solve the above problems and improve the service life of the slag tapping groove, in the existing technical solutions, a water-cooled slag groove is adopted, that is, water-cooling pipes are embedded in the slag groove precast. During slag tapping, by introducing a certain flow rate of cold water into the embedded water-cooling pipes, the temperature of the inner surface of the slag tapping groove is reduced, so that the temperature of the slag in contact with the inner surface of the slag tapping groove is reduced, thereby increasing the viscosity, facilitating the attachment of a layer of slag skin on the inner surface of the slag tapping groove, and further protecting the slag tapping groove from being damaged based on this slag skin, greatly improving the service life of the slag tapping groove.

[0004] However, in actual applications, the water-cooling effect based on the embedded water-cooling pipes is not stable, resulting in large fluctuations in the temperature of the inner surface of the slag tapping groove, which makes the slag skin not stably adhered to the inner surface of the slag tapping groove, and the high-temperature slag usually still damages the slag tapping groove.

[0005] At the same time, when using the embedded water-cooling pipes to water-cool the slag tapping groove, the flow rate of the water passing through the embedded water-cooling pipes is limited, and the heat taken away from the slag tapping groove is also greatly limited. However, the slag tapping process of the slag tapping groove is often intermittent. In the initial and later stages of slag tapping, there are large differences in the temperatures of the front and rear parts of the slag tapping groove, resulting in different temperatures in each area of the inner surface of the slag tapping groove, and there are also obvious differences in the slag skin adhesion effect on the inner surface of the slag tapping groove. Therefore, it is difficult to effectively control the uniformity of the temperature distribution on the inner surface of the slag tapping groove only by adjusting the water volume flowing through the embedded water-cooling pipes. Correspondingly, when the temperature distribution on the inner surface of the slag tapping groove is uneven, it is difficult to ensure that the temperature of the inner surface of the slag tapping groove is stable at the slag skin adhesion temperature, and it is also difficult to form a stable slag skin on the inner surface of the slag tapping groove to provide reliable protection for the slag tapping groove. Summary of the Invention

[0006] An embodiment of the present invention provides a phase change cooling device for a blast furnace slag tapping groove and a blast furnace slag tapping groove, which are used to solve the defect that the inner surface temperature of the existing water-cooled slag groove is uncontrollable, resulting in the problem that a stable slag skin cannot be formed during slag tapping.

[0007] To solve the above technical problems, an embodiment of the present invention provides a phase change cooling device for a blast furnace slag tapping groove, including: a phase change unit, which is used to be arranged on one side far from the inner surface of the slag tapping groove and is used to be correspondingly distributed along the inner surface of the slag tapping groove.

[0008] The phase change cooling device for a blast furnace slag tapping groove according to an embodiment of the present invention further includes: a high-temperature heat-conducting layer, which is used to be formed on the inner surface of the slag tapping groove.

[0009] The phase change cooling device for a blast furnace slag tapping groove according to an embodiment of the present invention further includes: a heat-conducting structure, which is formed on the side surface of the high-temperature heat-conducting layer facing the phase change unit, and the heat-conducting structure is connected to the phase change unit.

[0010] For the phase change cooling device for a blast furnace slag tapping groove according to an embodiment of the present invention, one end of the heat-conducting structure connected to the phase change unit is in a dovetail shape.

[0011] For the phase change cooling device for a blast furnace slag tapping groove according to an embodiment of the present invention, the phase change unit includes: a heat storage cavity and a phase change material, the heat storage cavity is used to be formed in the groove wall of the slag tapping groove, and the phase change material is filled in the heat storage cavity.

[0012] The phase change cooling device for a blast furnace slag tapping groove according to an embodiment of the present invention further includes: a heat transfer structure, which is arranged in the heat storage cavity, and at least one end of the heat transfer structure is used to extend out of the slag tapping groove.

[0013] For the phase change cooling device for a blast furnace slag tapping groove according to an embodiment of the present invention, the heat storage cavity is an interlayer formed in the groove wall of the slag tapping groove, the heat transfer structure is a pre-buried water-cooled pipe arranged in the interlayer, and the water inlet end and the water outlet end of the pre-buried water-cooled pipe are used to extend out of the slag tapping groove.

[0014] For the phase change cooling device for a blast furnace slag tapping groove according to an embodiment of the present invention, the pre-buried water-cooled pipe is used to be arranged in a serpentine reciprocating arrangement along the length direction of the slag tapping groove.

[0015] For the phase change cooling device for a blast furnace slag tapping groove according to an embodiment of the present invention, the phase change material includes at least one of an organic phase change material and an inorganic phase change material.

[0016] An embodiment of the present invention further provides a blast furnace slag tapping groove, including the phase change cooling device for a blast furnace slag tapping groove as described above.

[0017] One or more of the above technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0018] A phase change cooling device for a blast furnace slag tapping trough and a blast furnace slag tapping trough provided by an embodiment of the present invention address the defect that the inner surface temperature of the existing water-cooled slag trough is uncontrollable. By arranging a phase change unit on one side far from the inner surface of the slag tapping trough and distributing the phase change unit corresponding to the inner surface of the slag tapping trough, during slag tapping, based on the large amount of heat absorbed by the corresponding phase change material of the phase change unit during the phase change from solid phase to liquid phase, each area of the inner surface of the slag tapping trough can be rapidly cooled, and the uniformity of the cooling can be ensured, so that the inner surface of the slag tapping trough is stably maintained at the slag hanging temperature, thereby facilitating the formation of stable slag hanging on the inner surface of the slag tapping trough, and the slag skin of the slag hanging provides reliable protection for the slag tapping trough, thereby greatly improving the service life of the slag tapping trough. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a cross-sectional structural schematic diagram of the phase change cooling device for the blast furnace slag tapping trough shown in the embodiments of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the arrangement of pre-buried water-cooled pipes in the slag tapping trough shown in the embodiments of the present invention.

[0022] In the figure, 1, slag tapping trough; 2, phase change unit; 21, heat storage cavity; 22, phase change material; 3, high-temperature heat conduction layer; 4, heat conduction structure; 5, heat transfer structure. Detailed Embodiments

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] See Figure 1 , this embodiment provides a phase change cooling device for a blast furnace slag tapping trough, including: a phase change unit 2, which is used to be arranged on one side far away from the inner surface of the slag tapping trough 1 and is used to be correspondingly distributed along the inner surface of the slag tapping trough 1. Among them, the phase change unit 2 can be further evenly distributed corresponding to the inner surface of the slag tapping trough 1.

[0026] Specifically, for the phase change cooling device shown in this embodiment, aiming at the defect that the inner surface temperature of the existing water-cooled slag trough is uncontrollable, by arranging a phase change unit on one side far away from the inner surface of the slag tapping trough and distributing the phase change unit corresponding to the inner surface of the slag tapping trough, during slag tapping, based on the large amount of heat absorbed by the corresponding phase change material of the phase change unit during the phase change from solid phase to liquid phase, each area of the inner surface of the slag tapping trough can be rapidly cooled, and the uniformity of the cooling can be ensured, so that a layer of slag skin can be quickly attached to the inner surface of the slag tapping trough. Since the phase change material continuously absorbs a large amount of heat during the phase change process, the temperature of each area of the inner surface of the slag tapping trough can be stably maintained at the slag hanging temperature. In this way, it is convenient to form a stable slag hanging on the inner surface of the slag tapping trough, and the slag skin of the slag hanging will not be damaged during the slag tapping process, and the slag tapping trough can be reliably protected by the slag skin of the slag hanging, thereby greatly improving the service life of the slag tapping trough and reducing the maintenance cost of the slag tapping trough.

[0027] Among them, the slag tapping trough shown in this embodiment is usually in an arched trough shape, so the inner surface of the slag tapping trough correspondingly refers to the inner trough wall surface of the arched trough. The phase change unit shown in this embodiment is arranged on one side far away from the inner surface of the slag tapping trough, which can be understood as that the phase change unit can be arranged inside the trough wall of the slag tapping trough, on the outer surface of the slag tapping trough, or simultaneously inside the trough wall of the slag tapping trough and on the outer surface of the slag tapping trough. No specific limitation is made here, as long as the phase change unit is correspondingly distributed along the inner surface of the slag tapping trough, and during slag tapping, it can ensure that the inner surface of the slag tapping trough is stably maintained at the slag hanging temperature based on the phase change heat absorption of the phase change unit.

[0028] It should be pointed out here that through research, it is found that the water cooling effect of the existing water-cooled slag trough based on pre-buried water cooling pipes is not stable, resulting in large temperature fluctuations on the inner surface of the slag discharge trough. Moreover, due to the limited flow rate of the cold water passing through the pre-buried water cooling pipes, the heat carried away from the slag discharge trough is also greatly limited. When the slag discharge from the slag discharge trough is intermittent, the temperature distribution difference on the inner surface of the slag discharge trough is relatively large, making it difficult to form stable slag adhesion. As a result, the high-temperature slag usually damages the slag discharge trough. Therefore, in view of the defect that the inner surface temperature of the existing water-cooled slag trough is uncontrollable, the phase change cooling device for the blast furnace slag discharge trough is correspondingly designed in this embodiment. Although phase change materials have certain applications in the fields of building, power and communication equipment cooling, refrigeration equipment, etc. based on their own characteristics of absorbing heat during phase change, however, this technology has not been applied to the cooling of the slag discharge trough in blast furnace ironmaking. The reasons are as follows. On the one hand, the existing technicians only use the characteristic of phase change heat absorption of phase change materials to briefly cool or dissipate heat from related equipment, and do not precisely control the surface temperature of related equipment (slag discharge trough). On the other hand, the existing technicians do not recognize the essential reason why stable slag adhesion cannot be formed on the inner surface of the water-cooled slag trough based on the above research. Due to these technical prejudices or deficiencies in cognition, it is also difficult for the existing technicians to imagine that during slag discharge, the stability of the slag adhesion on the inner surface of the slag discharge trough is controlled by the phase change unit.

[0029] As Figure 1 shown, in a further preferred embodiment, a high-temperature resistant heat conduction layer 3 is also provided, and the high-temperature resistant heat conduction layer 3 is used to be formed on the inner surface of the slag discharge trough 1.

[0030] Specifically, the material that can be specifically selected for the high-temperature resistant heat conduction layer is high-carbonized silicon carbide carbonaceous material or graphite. The high-temperature resistant heat conduction layer can, on the one hand, effectively protect the slag discharge trough. When the blast furnace discharges slag, it can prevent the slag discharge trough from being severely damaged due to the long-term erosion and mechanical scouring of the high-temperature slag. Among them, the temperature of the slag during slag discharge from the slag discharge trough is usually between 1400°C and 1500°C. On the other hand, the high-temperature resistant heat conduction layer is also convenient for quickly conducting the heat of the high-temperature slag to the phase change unit, and the phase change heat absorption of the phase change material in the phase change unit can correspondingly quickly reduce the surface temperature of the high-temperature resistant heat conduction layer to the slag adhesion temperature, so as to quickly form a layer of slag skin on the surface of the high-temperature resistant heat conduction layer and ensure the stability of the slag skin during the slag discharge process, and it will not be damaged due to uneven temperature distribution on the surface of the high-temperature resistant heat conduction layer.

[0031] During actual design, the phase change unit can be in direct contact with the high-temperature resistant heat conduction layer. In this way, according to the thermal conductivity of the material selected for the high-temperature resistant heat conduction layer, based on the difference between the phase change temperature of the phase change material in the phase change unit and the slag adhesion temperature on the surface of the high-temperature resistant heat conduction layer, the designed thickness of the high-temperature resistant heat conduction layer can be calculated to ensure that a stable layer of slag skin is formed on the surface of the high-temperature resistant heat conduction layer during the slag discharge process.

[0032] As Figure 1 shown, in a further preferred embodiment, a heat conduction structure 4 is further provided. The heat conduction structure 4 is formed on one side of the high-temperature heat conduction layer 3 facing the phase change unit 2, and the heat conduction structure 4 is connected to the phase change unit 2. Wherein, one end of the heat conduction structure 4 connected to the phase change unit 2 is in a dovetail shape.

[0033] Thus, based on the heat conduction structure, not only can the contact area between the high-temperature heat conduction layer and the phase change unit be increased, and the heat transfer efficiency of the high-temperature heat conduction layer be improved, but when one end of the heat conduction structure connected to the phase change unit is designed in a dovetail shape, one end of the heat conduction structure connected to the phase change unit can be directly embedded into the corresponding phase change material of the phase change unit, so as to effectively prevent the high-temperature heat conduction layer from falling off the inner surface of the slag discharge groove during use.

[0034] Preferably, as Figure 1 shown, in this embodiment, the phase change unit 2 includes: a heat storage cavity 21 and a phase change material 22. The heat storage cavity 21 is used to be formed in the groove wall of the slag discharge groove 1, and the phase change material 22 is filled in the heat storage cavity.

[0035] Specifically, the heat storage cavity 21 shown in this embodiment can be a plurality of closed cavities, and the plurality of heat storage cavities 21 are isolated from each other, as long as they are evenly distributed corresponding to the inner surface of the slag discharge groove.

[0036] At the same time, the heat storage cavity 21 shown in this embodiment can also be a sandwich layer formed in the groove wall of the slag discharge groove 1. Thus, when the phase change material in the heat storage cavity 21 undergoes a phase change from solid to liquid, the phase change endotherm of the phase change material can rapidly and evenly reduce the temperature of the inner surface of the slag discharge groove, so as to quickly form a slag skin on the inner surface of the slag discharge groove, and can ensure that the inner surface of the slag discharge groove always maintains the slag hanging temperature during the slag discharge process, ensuring the stability of slag hanging.

[0037] Wherein, the heat storage cavity 21 shown in this embodiment can also be a closed interval formed by the sinking groove formed on the inner surface of the slag discharge groove 1 and the high-temperature heat conduction layer 3 shown in the above embodiment, so as to facilitate heat conduction between the phase change material in the heat storage cavity 21 and the high-temperature heat conduction layer 3.

[0038] Furthermore, the phase change material shown in this embodiment includes: at least one of an organic phase change material and an inorganic phase change material. Thus, the phase change material shown in this embodiment can be either a separately provided organic phase change material, or a separately provided inorganic phase change material, or a composite phase change material composed of a combination of an organic phase change material and an inorganic phase change material. The melting point of the phase change material can be 200°C - 500°C.

[0039] In this way, during the slag discharge process, when the slag with a temperature of 1400℃-1500℃ flows through the high-temperature heat-resistant thermal conductive layer, based on the thermal conductivity of the high-temperature heat-resistant thermal conductive layer, the heat is quickly transferred to the phase change material, and the phase change material absorbs heat and the temperature rises. After reaching the melting point, in the process of changing from solid phase to liquid phase, it absorbs and stores a large amount of latent heat, which in turn causes the surface temperature of the high-temperature heat-resistant thermal conductive layer to drop rapidly. Therefore, by reasonably designing the thickness of the high-temperature heat-resistant thermal conductive layer, the surface of the high-temperature heat-resistant thermal conductive layer can be maintained at an appropriate slag hanging temperature during the slag discharge process to ensure that a stable slag skin is formed on the surface of the high-temperature heat-resistant thermal conductive layer.

[0040] like Figure 1 As shown, in a further preferred embodiment, a heat transfer structure 5 may be further provided. The heat transfer structure 5 is provided in the heat storage cavity 21 , and at least one end of the heat transfer structure 5 is used to extend out of the slag discharge groove 1 .

[0041] Specifically, the heat transfer structure 5 can be a heat transfer plate, heat pipe, etc. that are well known in the art. The heat transfer structure 5 can be extended from one or more ends of the slag discharge groove to connect to an external cooling system to conduct the heat in the phase change material from the slag discharge groove in real time, so that the phase change material can maintain a long-lasting phase change process. Based on the heat absorption of the phase change material during the phase change process, the surface of the high-temperature resistant heat conductive layer can maintain a suitable slag hanging temperature during the slag discharge process.

[0042] like Figure 1 and Figure 2 As shown, in a further preferred embodiment, the heat transfer structure 5 can be set as a pre-buried water-cooling pipe embedded in the interlayer, the pre-buried water-cooling pipe is arranged in a serpentine reciprocating manner along the length direction of the slag groove, and the overall shape of the pre-buried water-cooling pipe is an arch adapted to the interlayer, and the water inlet and outlet ends of the pre-buried water-cooling pipe extend out of the slag groove 1.

[0043] In this way, the pre-buried water cooling pipe can be connected to the external water circulation system through the water inlet and outlet of the pre-buried water cooling pipe to form a closed loop, so that the heat stored in the phase change material can be released in real time through the circulating water flow. Here, the external water circulation system can be used for heating, bathroom heating, waste heat power generation, heat storage tank charging, etc., to achieve the reuse of low-grade energy.

[0044] At the same time, this embodiment also provides a blast furnace slag ditch, including the phase change cooling device of the blast furnace slag ditch as described above.

[0045] Thus, when the slag tapping trench shown in this embodiment is tapping slag, based on the large amount of latent heat absorbed by the phase change material during the transition from solid phase to liquid phase, it can rapidly cool each area of the inner surface of the slag tapping trench and ensure the uniformity of cooling, so that a layer of slag skin quickly adheres to the inner surface of the slag tapping trench. Since the heat conducted from the high-temperature heat-conducting layer to the phase change material can be conducted out of the slag tapping trench in real time through the water circulation in the pre-embedded water-cooling pipes, the phase change material can maintain a lasting phase change process. Based on the heat absorption of the phase change material during the phase change process, the surface of the high-temperature heat-conducting layer can always be maintained at an appropriate slag-hanging temperature, ensuring the stability of slag hanging and preventing the slag skin from being damaged during the slag tapping process. Thus, a reliable protection is formed for the slag tapping trench through the slag skin of slag hanging, greatly improving the service life of the slag tapping trench.

[0046] It should be pointed out here that compared with the existing water-cooled slag trenches, the phase change process of the phase change material shown in this embodiment due to heat is stable and reliable, and there is no risk of explosion during the phase change process. Since the pre-embedded water-cooling pipes are placed inside the phase change material, the phase change material can also form a reliable protection for the pre-embedded water-cooling pipes, preventing the pre-embedded water-cooling pipes from being burned through due to high temperature, thus ensuring the reliability of the use of the blast furnace slag tapping trench.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A phase change cooling device for a slag tapping trough of a blast furnace, characterized in that, Comprising: A phase change unit, disposed within the groove wall of the slag discharge trench; alternatively, the phase change unit is disposed on the outer surface of the slag discharge trench; alternatively, the phase change unit is simultaneously disposed within the groove wall of the slag discharge trench and on the outer surface of the slag discharge trench; The phase change unit is used to be correspondingly distributed along the inner surface of the slag discharge trench; The phase change unit includes: a heat storage cavity and a phase change material, the heat storage cavity is used to be formed within the groove wall of the slag discharge trench, and the phase change material is filled within the heat storage cavity; A high-temperature heat conduction layer, the high-temperature heat conduction layer is used to be formed on the inner surface of the slag discharge trench; the high-temperature heat conduction layer is used to conduct the heat of the high-temperature slag to the phase change unit; the phase change material includes at least one of an organic phase change material and an inorganic phase change material.

2. The phase change cooling device for the slag tapping trough of the blast furnace according to claim 1, wherein, Further comprising: A heat conduction structure, the heat conduction structure is formed on the side surface of the high-temperature heat conduction layer facing the phase change unit, and the heat conduction structure is connected to the phase change unit.

3. The phase change cooling device for the blast furnace slag tapping trough according to claim 2, wherein, One end of the heat conduction structure connected to the phase change unit is in a dovetail shape.

4. The phase change cooling device for the slag tapping trough of the blast furnace according to claim 1, characterized in that, Further comprising: A heat transfer structure, the heat transfer structure is disposed within the heat storage cavity, and at least one end of the heat transfer structure is used to extend out of the slag discharge trench.

5. The phase change cooling device for the slag tapping trough of the blast furnace according to claim 4, wherein The heat storage cavity is an interlayer used to be formed within the groove wall of the slag discharge trench, the heat transfer structure is a pre-buried water-cooled pipe disposed within the interlayer, and the water inlet end and the water outlet end of the pre-buried water-cooled pipe are used to extend out of the slag discharge trench.

6. The phase change cooling device for the blast furnace slag tapping trough according to claim 5, characterized in that, The pre-buried water-cooled pipe is used to be arranged in a serpentine reciprocating pattern along the length direction of the slag discharge trench.

7. A blast furnace slag tapping trough, characterized in that, Comprising the phase change cooling device for a blast furnace slag discharge trench according to any one of claims 1 to 6.

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