Heat recovery system for high-temperature metallurgical slag

Abstract

The invention relates to a heat extraction and recovery system for high-temperature metallurgical slag. A heat exchange medium container, a heat exchange medium driving pump, a heat extraction device and a steam generator are circularly and sequentially connected through a heat exchange medium pipeline; a heat removal plate of the heat removal device comprises a material contact layer and a liquid medium layer arranged below the material contact layer, and a medium inlet and outlet is formed in the liquid medium layer and communicated with a heat exchange medium pipeline. The heat removal device is arranged below the steel slag roller press and used in cooperation with the steel slag roller press, steel slag water spraying cooling is reduced, high-grade waste heat contained in steel slag is recycled, and the original technological process is not affected. The heat removal device adopts a chain wheel and chain mechanism as a driving device, and a flattening device, a material turning device and a material scraping device are additionally arranged, so that high-temperature materials are in contact with a heat removal plate repeatedly, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature metallurgical slag treatment, and in particular to a heat recovery system for high-temperature metallurgical slag. Background Art

[0002] A large amount of high-temperature metallurgical slag is produced when smelting metals in the metallurgical industry, especially in the steel industry. According to statistics, 80 to 150 kg of slag is produced for every ton of steel produced. The initial temperature of the slag is about 1300°C, which contains a large amount of thermal energy. Current slag treatment methods such as roller pressing, drum method, pool hot stuffing method, etc. have failed to recycle the heat.

[0003] At present, in the field of steel slag treatment in the market, steel slag roller processing technology has a high market share. This process can quickly cool and crush steel slag, and can cool 1300℃ steel slag to 600℃ in about 30 minutes, which greatly improves the efficiency of steel slag treatment. This process can achieve rapid cooling of steel slag, but the heat generated during the cooling of steel slag is not recycled. If a waste heat recovery device is added on the basis of this process, it can generate huge energy-saving benefits.

[0004] Therefore, it is necessary to provide a heat recovery system for high-temperature metallurgical slag, which can be used for heat recovery of solid high-temperature metallurgical slag or other high-temperature materials. It can be added to the next process of slag rolling, which is currently widely used, and changes the current way of cooling slag. It can not only quickly cool the slag, but also recover the high-grade waste heat contained in the slag. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a heat recovery system for high-temperature metallurgical slag, which contacts the high-temperature material through a heat extraction device, removes the heat in the high-temperature material through a heat exchange medium, and recirculates the heat for heat exchange after heat exchange at the cold end of the heat exchange medium, which can not only quickly cool the slag, but also recover the high-grade waste heat contained in the slag.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A heat recovery system for high-temperature metallurgical slag comprises a heat exchange medium container, a heat exchange medium driving pump, a heat extraction device and a steam generator which are sequentially connected through a heat exchange medium pipeline circulation; the heat extraction device comprises a heat extraction plate, the heat extraction plate comprises a material contact layer and a liquid medium layer arranged below the material contact layer, a heat extraction plate rib is arranged at the edge of the material contact layer, a medium inlet and outlet are arranged on the liquid medium layer, and the medium inlet and outlet are communicated with the heat exchange medium pipeline.

[0008] The steam generator needs to have a certain pressure bearing capacity, and the flow of the heat exchange medium inside it includes but is not limited to coil type, etc. The material contact layer adopts a wear-resistant and high-temperature resistant metal plate, and the liquid medium layer is below the material contact layer. The heat exchange medium flowing in from the heat exchange medium pipeline flows in the liquid medium layer flow channel, and the heat is taken away by the flow of the heat exchange medium. The liquid medium layer is not limited to using pipes welded under the wear-resistant and high-temperature resistant metal plate or grooves under the wear-resistant metal plate to form a flow channel.

[0009] Preferably, the heat extraction device also includes a chain, a sprocket and a driving device, the sprockets are respectively arranged at both ends of the heat extraction plate, the rotation axis of the sprocket is perpendicular to the length direction of the heat extraction plate, the driving device is arranged on the central rotation axis of the sprocket, the chains are respectively arranged on both sides of the heat extraction plate and the chains are driven to rotate synchronously by the sprockets.

[0010] Preferably, a plurality of connecting beams are fixedly connected to the synchronous positions of the chains on both sides of the heat extraction plate, and the connecting beams are respectively fixedly provided with a flattening device, a material turning device and a material scraping device. The driving device drives the sprocket to rotate, and the sprocket drives the chain and the flattening device, the material turning device and the material scraping device fixed on the chain to move cyclically.

[0011] Preferably, the heat recovery system also includes a feed port and a discharge port, wherein the feed port is arranged above one end of the heat extraction plate, the feed port is located at the starting position of the chain forward direction above the heat extraction plate, and the discharge port is arranged below the other end of the heat extraction plate. The heat extraction device is arranged directly below the feed port to further cool the steel slag after rolling, while absorbing the heat in the steel slag to generate steam. After adopting this system, the rolling time can be appropriately shortened, the water spraying in the steel slag rolling zone can be reduced or eliminated, the load on the rolling equipment and ancillary public and auxiliary equipment can be reduced, and the energy consumption of the equipment can be reduced. After heat extraction, the steel slag continues to enter the heat stuffing device for heat stuffing, and this system does not affect the processing flow of the original process.

[0012] Preferably, when the chain above the heat extraction plate moves forward from the feed port, the flattening device, the turning device and the scraping device pass over the heat extraction plate in sequence. A certain space is left between the flattening device and the heat extraction plate. The sharp corners of the flattening device are used to flatten the incoming material from the feed port so that the material is spread flat on the heat extraction plate. The turning device loosens and turns the material so that the upper layer of material can directly contact the contact plate to increase the heat extraction effect. The scraping device is basically in contact with the upper surface of the heat extraction plate, and the cooled material is gathered through the shape of the closing opening and scraped into the discharge port.

[0013] Preferably, the flattening device, the turning device and the scraping device are plow-shaped, trapezoidal, triangular, rectangular or tooth-shaped structures. The flattening device is used to evenly flatten the material, the turning device is used to loosen and turn the material and prevent it from getting stuck, and the scraping device is used to deliver the material to the discharge port. The number and specific parameters of the flattening device, the turning device and the scraping device can be selected according to actual conditions.

[0014] Preferably, the heat exchange medium pipeline is made of high temperature resistant and corrosion resistant material and is weldable. The material of the heat exchange medium pipeline includes but is not limited to cast steel (ZG270-500, ZG310-570, ZG340-640), stainless steel (304, 309, 321, 316, T91, 408, 409, 410, 440), etc.

[0015] Preferably, the heat exchange medium container and the heat exchange medium pipeline are filled with heat exchange medium, and the heat exchange medium is a low melting point eutectic metal, and the low melting point eutectic metal is bismuth and bismuth-based alloys, gallium and gallium-based alloys, or lead and lead-based alloys. The heat exchange medium should maintain a single-phase state throughout the heat recovery process, and metal alloys with extremely high thermal conductivity, such as bismuth and bismuth-based alloys, gallium and gallium-based alloys, lead and lead-based alloys, etc., are preferably selected according to on-site conditions and needs. The heat exchange medium can obtain high-grade heat and improve the recovery value of waste heat.

[0016] Preferably, the heat exchange medium driving pump is an electromagnetic pump. The heat exchange medium driving pump can be selected according to the type of internal heat exchange medium. If the heat exchange medium is made of a material with high electrical conductivity, an electromagnetic pump is preferred.

[0017] The working process of a heat recovery system for high-temperature metallurgical slag of the present invention is as follows:

[0018] The high-temperature material from the roller press falls from the feed port to the material contact layer of the heat extraction plate. The drive device drives the chain and the flattening device, turning device and scraping device fixed on the chain to move cyclically. The material is first flattened by the flattening device, and then repeatedly turned and loosened by several turning devices. The material and the material contact layer are in direct contact for heat exchange. The heat exchange medium in the liquid medium layer below takes away the heat of the material, and generates steam through the steam generator. The heat exchange medium with reduced temperature flows into the heat exchange medium container, and then the heat exchange medium is driven by the heat exchange medium to pump to the heat extraction device for heat extraction. After the temperature of the material on the heat extraction device is reduced to a predetermined temperature, it is scraped into the discharge port by the scraping device, completing a heat extraction work cycle.

[0019] The beneficial effects of the present invention are as follows:

[0020] The present invention adopts the above technical scheme, and the heat extraction device is arranged below the steel slag roller press and used in conjunction with the steel slag roller press, which reduces the water spray cooling of the steel slag, recovers the high-grade waste heat contained in the steel slag, and does not affect the original process flow. The heat extraction device adopts a sprocket chain mechanism as a driving device, and adds a flattening device, a material turning device, and a material scraping device, so that the high-temperature material repeatedly contacts the heat extraction plate, thereby increasing the efficiency of heat exchange. After adding this device below the roller press, the water spray cooling during roller pressing can be cancelled or the water spray amount can be reduced, which reduces the load of the roller pressing equipment and the dust removal system, the water treatment system and the electrical system, and reduces the overall investment of the project. The heat extraction plate of the present invention is fixed, and the heat exchange medium pipeline is also a fixed pipeline. There are no components such as rotary joints and hoses, which reduces the probability of leakage of the heat extraction medium and increases the service life of the heat extraction plate. The cold end of the heat exchange medium can be a heat-using device such as a steam generator, which can generate steam for direct use or regeneration, realize the efficient recovery and utilization of heat energy, and solve the problem that waste heat is difficult to recover during metallurgical slag treatment.

[0021] At the same time, the present invention can also be used for cooling and removing heat from other solid high-temperature block or powder materials. The equipment has a simple and practical structure. The material is continuously stirred by the turning device to increase the contact between the material and the heat extraction plate, so that the heat exchange efficiency is significantly increased, the cooling speed is fast, and the heat extraction effect is more obvious.

[0022] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0024] Figure 1 A schematic structural diagram of a heat recovery system for high-temperature metallurgical slag according to the present invention is shown.

[0025] Figure 2 A front view of a heat extraction device of a heat extraction and recovery system for high-temperature metallurgical slag according to the present invention is shown.

[0026] Figure 3 A top view detail view of a heat extraction device of a heat extraction and recovery system for high-temperature metallurgical slag according to the present invention is shown.

[0027] Figure 4A detailed upward view of a heat extraction device of a heat extraction and recovery system for high-temperature metallurgical slag according to the present invention is shown.

[0028] Description of main reference numerals:

[0029] 1-heat extraction device, 11-chain, 12-sprocket, 13-flattening device, 14-turning device, 15-scraping device, 16-heat extraction plate, 161-heat extraction plate rib, 162-material contact layer, 163-liquid medium layer, 164-medium inlet and outlet, 17-feed port, 18-discharge port, 19-driving device, 2-heat exchange medium pipeline, 3-heat exchange medium container, 4-heat exchange medium driving pump, 5-steam generator. DETAILED DESCRIPTION

[0030] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0031] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0032] In this document, for the convenience of description, spatial relative terms such as "below", "below", "down", "above", "above", "upper", etc. may be used to describe the relationship between one element or feature and another element or feature in the accompanying drawings. It should be understood that the spatial relative terms are intended to include different orientations of the object in use or operation in addition to the orientation depicted in the figure. For example, if the object in the figure is turned over, the element described as being "below" or "below" other elements or features will be oriented "above" the element or feature. Therefore, the exemplary term "below" can include both below and above. Objects may also have other orientations (rotated 90 degrees or other orientations) and the spatial relative terms used in this document should be interpreted accordingly.

[0033] like Figure 1-Figure 4 As shown, a heat recovery system for high-temperature metallurgical slag includes a heat exchange medium container 3, a heat exchange medium driving pump 4, a heat extraction device 1 and a steam generator 5 which are sequentially connected through a heat exchange medium pipeline 2; the heat extraction device 1 includes a heat extraction plate 16, the heat extraction plate 16 includes a material contact layer 162 and a liquid medium layer 163 arranged below the material contact layer 162, a heat extraction plate rib 161 is provided at the edge of the material contact layer 162, a medium inlet and outlet 164 is provided on the liquid medium layer 163, and the medium inlet and outlet 164 is communicated with the heat exchange medium pipeline 2.

[0034] The heat exchange medium driving pump 4 is an electromagnetic pump. The heat exchange medium driving pump 4 can be selected according to the type of internal heat exchange medium. If the heat exchange medium is a material with high electrical conductivity, an electromagnetic pump is preferred. The steam generator 5 needs to have a certain pressure bearing capacity, and the flow of the heat exchange medium inside it includes but is not limited to coil type. The heat exchange medium pipeline 2 is made of high temperature and corrosion resistant material and is weldable. The material of the heat exchange medium pipeline 2 includes but is not limited to cast steel (ZG270-500, ZG310-570, ZG340-640), stainless steel (304, 309, 321, 316, T91, 408, 409, 410, 440), etc. The heat exchange medium container 3 and the heat exchange medium pipeline 2 are filled with heat exchange medium, and the heat exchange medium is a low melting point eutectic metal, and the low melting point eutectic metal is bismuth and bismuth-based alloys, gallium and gallium-based alloys or lead and lead-based alloys. The heat exchange medium should maintain a single-phase state throughout the heat recovery process, and metal alloys with extremely high thermal conductivity, such as bismuth and bismuth-based alloys, gallium and gallium-based alloys, lead and lead-based alloys, etc., should be preferred. The heat exchange medium can obtain high-grade heat and improve the recovery value of waste heat.

[0035] The material contact layer 162 is made of a wear-resistant and high-temperature resistant metal plate, and the liquid medium layer 163 is below the material contact layer 162. The heat exchange medium flowing in from the heat exchange medium pipeline 2 flows in the flow channel of the liquid medium layer 163, and the heat is taken away by the flow of the heat exchange medium. The liquid medium layer 163 is not limited to using pipes welded under the wear-resistant and high-temperature resistant metal plate or cutting grooves under the wear-resistant metal plate to form a flow channel.

[0036] The heat extraction device 1 further comprises a chain 11, a sprocket 12 and a driving device 19. The sprocket 12 is respectively arranged at both ends of the heat extraction plate 16. The rotation axis of the sprocket 12 is perpendicular to the length direction of the heat extraction plate 16. The driving device 19 is arranged on the central rotation axis of the sprocket 12. The chains 11 are respectively arranged on both sides of the heat extraction plate 16 and the chains 11 are driven to rotate synchronously by the sprocket 12. A plurality of connecting beams are fixedly connected to the synchronous positions of the chains 11 on both sides of the heat extraction plate 16. The connecting beams are respectively fixedly provided with a flattening device 13, a material turning device 14 and a material scraping device 15. The driving device 19 drives the sprocket 12 to rotate, and the sprocket 12 drives the chain 11 and the flattening device 13, the material turning device 14 and the material scraping device 15 fixed on the chain 11 to move cyclically.

[0037] The heat recovery system also includes a feed port 17 and a discharge port 18. The feed port 17 is arranged above one end of the heat extraction plate 16. The feed port 17 is located at the starting point of the chain 11 in the forward direction above the heat extraction plate 16. The discharge port 18 is arranged below the other end of the heat extraction plate 16. The heat extraction device 1 is arranged directly below the feed port 17 to further cool the steel slag after rolling, while absorbing the heat in the steel slag to generate steam. After adopting this system, the rolling time can be appropriately shortened, the water spraying in the steel slag rolling zone can be reduced or eliminated, the load on the rolling equipment and ancillary public and auxiliary equipment can be reduced, and the energy consumption of the equipment can be reduced. After heat extraction, the steel slag continues to enter the heat stuffing device for heat stuffing. This system does not affect the processing flow of the original process.

[0038] When the chain 11 above the heat extraction plate 16 moves forward from the feed port 17, the flattening device 13, the turning device 14 and the scraping device 15 sequentially pass over the heat extraction plate 16. A certain space is left between the flattening device 13 and the heat extraction plate 16. The sharp corners of the flattening device 13 are used to flatten the incoming materials from the feed port 17 so that the materials are spread flat on the heat extraction plate 16. The turning device 14 loosens and turns the materials so that the upper layer of materials can directly contact the contact plate to increase the heat extraction effect. The scraping device 15 is basically in contact with the upper surface of the heat extraction plate 16, and gathers the cooled materials through the shape of the closed opening and scrapes them into the discharge port 18.

[0039] The flattening device 13, the turning device 14 and the scraping device 15 are plow-shaped, trapezoidal, triangular, rectangular or tooth-shaped structures. The flattening device 13 is used to evenly flatten the material, the turning device 14 is used to loosen and turn the material and prevent it from getting stuck, and the scraping device 15 is used to send the material to the discharge port. The number and specific parameters of the flattening device 13, the turning device 14 and the scraping device 15 can be selected according to actual conditions.

[0040] The working process of a heat recovery system for high-temperature metallurgical slag of the present invention is as follows:

[0041] The high-temperature material from the roller press falls from the feed port 17 to the material contact layer 162 of the heat extraction plate 16. The driving device 19 drives the chain 11 and the flattening device 13, the turning device 14 and the scraping device 15 fixed on the chain 11 to move cyclically. The material is first flattened by the flattening device 13, and then repeatedly turned and loosened by several turning devices 14. The material directly contacts and exchanges heat with the material contact layer 162. The heat exchange medium in the liquid medium layer 163 below takes away the heat of the material, and generates steam through the steam generator 5. The heat exchange medium with reduced temperature flows into the heat exchange medium container 3, and then the heat exchange medium is sent to the heat extraction device 1 through the heat exchange medium driving pump 4 for heat extraction. After the temperature of the material on the heat extraction device 1 is reduced to a predetermined temperature, it is scraped into the discharge port by the scraping device 15, completing a heat extraction working cycle.

[0042] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. Any simple modifications, equivalent changes and modifications made to the above exemplary embodiments should fall within the scope of protection of the present invention.

Claims

1. A heat recovery system for high temperature metallurgical slag, characterized in that: It comprises a heat exchange medium container (3), a heat exchange medium drive pump (4), a heat extraction device (1) and a steam generator (5) which are sequentially connected through a heat exchange medium pipeline (2); The heat extraction device (1) comprises a heat extraction plate (16), wherein the heat extraction plate (16) comprises a material contact layer (162) and a liquid medium layer (163) arranged below the material contact layer (162), a heat extraction plate rib (161) is arranged at the edge of the material contact layer (162), and a medium inlet and outlet (164) is arranged on the liquid medium layer (163), and the medium inlet and outlet (164) is connected to the heat exchange medium pipeline (2).

2. A heat recovery system for high temperature metallurgical slag according to claim 1, characterized in that: The heat extraction device (1) further comprises a chain (11), a sprocket (12) and a driving device (19); the sprocket (12) is respectively arranged at two ends of a heat extraction plate (16); the rotation axis of the sprocket (12) is perpendicular to the length direction of the heat extraction plate (16); the driving device (19) is arranged on the central rotation axis of the sprocket (12); the chain (11) is respectively arranged at two sides of the heat extraction plate (16); and the chain (11) is driven to rotate synchronously by the sprocket (12).

3. A heat recovery system for high temperature metallurgical slag according to claim 2, characterized in that: A plurality of connecting beams are fixedly connected to the synchronous positions of the chains (11) on both sides of the heat extraction plate (16), and a flattening device (13), a material turning device (14) and a material scraping device (15) are respectively fixedly provided on the connecting beams.

4. A heat recovery system for high temperature metallurgical slag according to claim 3, characterized in that: The heat recovery system further comprises a feed port (17) and a discharge port (18); the feed port (17) is arranged above one end of the heat extraction plate (16); the feed port (17) is located at the starting point of the chain (11) in the forward direction above the heat extraction plate (16); and the discharge port (18) is arranged below the other end of the heat extraction plate (16).

5. The heat recovery system for high-temperature metallurgical slag according to claim 4, characterized in that: When the chain (11) above the heat extraction plate (16) moves forward from the feed port (17), the flattening device (13), the turning device (14) and the scraping device (15) pass over the heat extraction plate (16) in sequence.

6. The heat recovery system for high-temperature metallurgical slag according to claim 5, characterized in that: The flattening device (13), the material turning device (14) and the material scraping device (15) are plough-shaped, trapezoidal, triangular, rectangular or tooth-shaped structures.

7. The heat recovery system for high-temperature metallurgical slag according to claim 1, characterized in that: The heat exchange medium pipeline (2) is made of a high temperature resistant and corrosion resistant material and is weldable.

8. The heat recovery system for high-temperature metallurgical slag according to claim 1, characterized in that: The heat exchange medium container (3) and the heat exchange medium pipeline (2) are filled with heat exchange medium, the heat exchange medium is a high temperature resistant fluid, and the heat exchange medium is bismuth and bismuth-based alloys, gallium and gallium-based alloys, or lead and lead-based alloys.

9. The heat recovery system for high-temperature metallurgical slag according to claim 1, characterized in that: The heat exchange medium driving pump (4) is an electromagnetic pump.

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