Furnace body heat energy recovery device

Abstract

The utility model provides a furnace body heat energy recovery device which is arranged on a furnace body with a smelting cavity, the smelting cavity is formed by dividing a molten pool and a furnace shell covering the molten pool, and the furnace body heat energy recovery device comprises a heat absorption mechanism located in the smelting cavity; the heat release mechanism is arranged on the outer side of the furnace body, the heat release mechanism communicates with the heat absorption mechanism, and the heat release mechanism is provided with a heat release structure for releasing heat energy; and the feeding mechanism is provided with a feeding structure and a preheating cavity for containing smelting materials, the feeding structure communicates with the preheating cavity and the smelting cavity, the heat release structure is arranged in the preheating cavity, and the problem that the waste heat recovery efficiency of the steel smelting furnace is low is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel smelting, in particular to a furnace heat energy recovery device. Background Art

[0002] The description in this section merely provides background information related to the disclosure of the present utility model and does not constitute prior art.

[0003] In the existing field of steel smelting technology, electric arc furnaces or other smelting furnaces are usually used to smelt steel; among them, the energy consumption of heating the temperature of steel accounts for a large proportion of the energy consumption of the smelting furnace. The high energy consumption of smelting steel has made the steelmaking industry an obstacle to the high-quality development of regional industry. Therefore, reducing the energy consumption of the steel smelting industry has become the direction of industry development; among them, the energy consumption of electric arc furnaces and other smelting furnaces mainly comes from the consumption of energy such as electricity, gas, oxygen, and combustibles. Therefore, improving energy utilization is a problem that needs to be solved in the field of steel smelting.

[0004] In response to the above problems, some technical solutions have optimized the smelting process to reduce the use of energy in the smelting process, but have not involved the utilization of waste heat with high energy consumption in the smelting process; some technical solutions have recovered the energy in the waste heat flue gas discharged from the smelting furnace to avoid energy waste caused by direct discharge of waste heat, thereby improving the energy utilization efficiency, but the energy contained in the waste heat flue gas discharged from the smelting furnace only accounts for a small part of the waste energy of the smelting furnace, and does not involve the recovery of other waste heat generated by the molten steel. Even if this solution completely absorbs the waste heat energy in the waste heat flue gas, its energy recovery rate is still low, and it cannot achieve the goal of energy conservation and emission reduction well; in another implementation scheme, the furnace shell of the smelting furnace is cooled and the heat absorbed by the furnace shell is recovered, but this solution still has a low waste heat recovery rate for the smelting furnace, and cannot further improve the waste heat recovery efficiency of the smelting furnace.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the utility model and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the utility model. Utility Model Content

[0006] The utility model aims to provide a furnace heat energy recovery device, which solves the problem of low waste heat recovery efficiency of a steel smelting furnace.

[0007] The above-mentioned implementation purpose of the utility model is mainly achieved by the following technical solutions:

[0008] The utility model provides a furnace body heat energy recovery device, which is arranged on a furnace body with a smelting chamber, wherein the smelting chamber is divided and formed by a molten pool and a furnace shell covering the molten pool. The furnace body heat energy recovery device comprises:

[0009] A heat absorption mechanism, located in the smelting chamber;

[0010] A heat release mechanism is arranged on the outside of the furnace body, the heat release mechanism is connected with the heat absorption mechanism, and the heat release mechanism has a heat release structure for releasing heat energy;

[0011] The feeding mechanism comprises a feeding structure and a preheating chamber for accommodating smelting materials, wherein the feeding structure is respectively connected with the preheating chamber and the smelting chamber, and the heat release structure is arranged in the preheating chamber.

[0012] In a specific embodiment, the heat absorption mechanism has at least two heat absorption structures, at least two of the heat absorption structures are adjacently arranged along the height direction of the furnace body, and at least two of the heat absorption structures are located above the molten pool.

[0013] In a specific embodiment, the heat absorption structure has a first heat absorption tube and / or a second heat absorption tube, the first heat absorption tube is spirally arranged along the circumference of the furnace shell, the second heat absorption tube is coiled on the radial plane of the furnace shell, and the first heat absorption tube and the second heat absorption tube are both arranged close to the inner side of the furnace shell.

[0014] In a specific embodiment, the heat release structure is formed by bending a heat release tube, and the heat release tube has a plurality of heat release bends, and two heat release bends connected at intervals are arranged at intervals along the radial direction or the circumferential direction of the preheating chamber.

[0015] In a specific embodiment, the spacing distance between the two heat release elbows connected at intervals is greater than 8 mm and less than 22 mm.

[0016] In a specific embodiment, the feeding mechanism further comprises a rotating structure and a drum structure which are meshed and connected, the preheating chamber is formed in the drum structure, and when the rotating structure rotates, the drum structure is rotatably arranged around its central axis.

[0017] In a specific embodiment, the feeding structure has a feeding gate and a feeding hopper. The feeding gate is openably arranged at the bottom of the drum structure, the inlet of the feeding gate is connected to the preheating chamber, the feeding hopper is arranged on the top of the furnace body, one end of the feeding hopper is connected to the smelting chamber, and the other end of the feeding hopper is connected to the outlet of the feeding gate.

[0018] In a specific embodiment, the furnace body heat energy recovery device also includes: a first pressurizing structure for pumping the heat storage medium, the first pressurizing structure has a heating chamber for heating the heat storage medium, the outlet of the first pressurizing structure is connected to the inlet of the heat absorption mechanism, and the inlet of the first pressurizing structure is connected to the outlet of the heat release mechanism.

[0019] In a specific embodiment, the furnace heat recovery device further includes: a second pressurizing structure, the inlet of the second pressurizing structure is connected to the outlet of the heat absorbing mechanism, and the outlet of the second pressurizing structure is connected to the inlet of the heat releasing mechanism.

[0020] In a specific embodiment, the flow rate of the heat storage medium in the first heat absorption tube and / or the second heat absorption tube is 200 L·s -1 ·m -2 ~400L·s -1 ·m -2 .

[0021] In a specific embodiment, the temperature of the heat storage medium at the outlet of the heat absorption structure is 300°C.

[0022] Compared with the prior art, the technical solution described in the utility model has the following characteristics and advantages:

[0023] The furnace heat energy recovery device provided by the utility model is configured to have a heat absorbing mechanism in the smelting chamber for absorbing the heat of the high-temperature flue gas and the heat of thermal radiation generated when the molten pool smelts steel; a heat releasing mechanism is arranged outside the furnace body and is communicated with the heat absorbing mechanism for transporting the absorbed heat to the outside of the furnace body; a heat releasing structure arranged on the heat releasing mechanism is used to release the absorbed heat for secondary utilization; a feeding mechanism is used to specially transport smelting material to the molten pool; a preheating chamber is used to store smelting material to be added; a feeding structure is used to transport the smelting material stored in the preheating chamber into the smelting chamber; a heat releasing structure is arranged in the preheating chamber for releasing the heat absorbed from the smelting chamber into the smelting material located in the preheating chamber, and preheating the smelting material in advance, thereby saving smelting time and improving smelting efficiency; at the same time, secondary absorption and utilization of waste energy in the smelting chamber is also realized, and the problem of long-term high temperature damage to the furnace shell due to excessive waste heat accumulation in the smelting chamber is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of the furnace heat recovery device of the utility model;

[0025] Figure 2 This is a structural diagram of the second heat absorption tube of the furnace heat energy recovery device of the present utility model.

[0026] Description of Figure Numbers:

[0027] 1. Furnace body; 11. Smelting chamber; 12. Furnace shell; 13. Molten pool;

[0028] 2. heat absorption mechanism; 21. heat absorption structure; 211. first heat absorption tube; 212. second heat absorption tube; 2121. first coiling structure; 2122. second coiling structure;

[0029] 3. heat release mechanism; 31. heat release structure; 311. heat release pipe; 3111. heat release elbow;

[0030] 4. Feeding mechanism; 41. Feeding structure; 411. Feeding gate; 412. Feeding hopper; 42. Preheating chamber; 43. Rotating structure; 431. Gear member; 432. Motor; 44. Rotating drum structure; 441. Gear ring;

[0031] 5. first pressurizing structure; 51. heating chamber;

[0032] 6. Second pressurizing structure;

[0033] F. The central axis of the drum structure;

[0034] D. The axis of the preheating chamber. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0036] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] like Figure 1 As shown, the utility model provides a furnace body heat energy recovery device, which is arranged on a furnace body 1 having a smelting chamber 11, and the smelting chamber 11 is divided into a molten pool 13 and a furnace shell 12 covered on the molten pool 13. The furnace body heat energy recovery device includes:

[0039] A heat absorption mechanism 2, located in the smelting chamber 11;

[0040] A heat release mechanism 3 is arranged outside the furnace body 1, the heat release mechanism 3 is connected with the heat absorption mechanism 2, and the heat release mechanism 3 has a heat release structure 31 for releasing heat energy;

[0041] The feeding mechanism 4 comprises a feeding structure 41 and a preheating chamber 42 for accommodating smelting materials. The feeding structure 41 is respectively connected with the preheating chamber 42 and the smelting chamber 11 , and the heat release structure 31 is arranged in the preheating chamber 42 .

[0042] The furnace body heat energy recovery device provided by the utility model is applied to a furnace body 1 having a smelting chamber 11, wherein the smelting chamber 11 is mainly formed by assembling a downwardly concave molten pool 13 and a furnace shell 12 covering the molten pool 13, wherein the area of ​​the smelting chamber 11 includes a molten pool area for smelting steel and a furnace shell area located above the molten pool 13 area.

[0043] The furnace heat energy recovery device provided by the utility model is used to absorb the heat of high-temperature flue gas and heat of heat radiation generated when the molten pool 13 smelts steel through the heat absorption mechanism 2 arranged in the smelting chamber 11. The heat release mechanism 3 is arranged outside the furnace body 1 and is connected with the heat absorption mechanism 2 to transport the absorbed heat to the outside of the furnace body 1. The heat release structure 31 provided by the heat release mechanism 3 is used to release the absorbed heat for secondary utilization. The feeding mechanism 4 is used to specially transport the smelting material to the molten pool 13, and the preheating chamber 42 is used to store the heat. The smelting material to be added is stored, and the feeding structure 41 is used to transport the smelting material stored in the preheating chamber 42 to the smelting chamber 11. The heat release structure 31 is arranged in the preheating chamber 42, and is used to release the heat absorbed from the smelting chamber 11 to the smelting material located in the preheating chamber 42, so as to preheat the smelting material in advance, save the smelting time, and improve the smelting efficiency. At the same time, it also realizes the secondary absorption and utilization of the waste energy in the smelting chamber 11, and avoids the problem of long-term high temperature damage of the furnace shell 12 due to excessive waste heat accumulated in the smelting chamber 11.

[0044] Specifically, in this embodiment, the heat absorption mechanism 2 is generally composed of a pipe with heat absorption capacity and a heat storage medium flowing in the pipe. In this embodiment, the pipe with heat absorption capacity can be a pure copper pipe, etc. In other embodiments, other heat absorption mechanisms 2 can also be used, and there is no specific limitation on this. The heat absorption mechanism 2 of this embodiment is arranged on the inner side of the furnace shell, that is, the heat absorption mechanism 2 is connected to the furnace shell 12, and the heat absorption mechanism 2 is arranged above the molten pool 13. One end of the heat absorption mechanism 2 of this embodiment passes through the furnace shell 12 and is connected to the heat release mechanism 3. The heat release mechanism 3 of this embodiment is generally composed of a pipe with a thermal insulation layer, and the heat release structure 31 of this embodiment is generally composed of a pipe without a thermal insulation layer (such as a pure copper pipe). In other embodiments, the heat release structure 31 can also be a heat release sheet structure, and there is no specific limitation on this. Specifically in this embodiment, the heat storage medium flows through the heat absorption mechanism 2 to the heat release mechanism 3 located outside the furnace body 1. Further, the heat storage medium containing high heat flows to the heat release structure 31 located in the preheating chamber 42. The heat release structure 31 dissipates heat into the preheating chamber 42 to heat the smelting material in the preheating chamber 42.

[0045] like Figure 1 As shown, in a specific embodiment, the heat absorption mechanism 2 has at least two heat absorption structures 21, at least two of the heat absorption structures 21 are adjacently arranged along the height direction of the furnace body 1, and at least two of the heat absorption structures 21 are located above the molten pool 13.

[0046] The furnace heat recovery device provided by the utility model can improve the heat absorption efficiency of the heat absorption mechanism 2 by setting at least two heat absorption structures 21, thereby avoiding the problem of low waste heat absorption rate caused by limited absorption energy when only a single heat absorption structure 21 is used to absorb heat.

[0047] Specifically in this embodiment, the heat absorbing structure 21 is composed of a pipe with heat absorbing capacity, at least two heat absorbing structures 21 are arranged in parallel, and at least two heat absorbing structures 21 are arranged adjacent to each other in the height direction. The number of the heat absorbing structures 21 in this embodiment is two. In other embodiments, the number of the heat absorbing structures 21 can also be three or four, and there is no specific limitation on this. At least two heat absorbing structures 21 in this embodiment are arranged above the molten pool 13, that is, the heat absorbing structure 21 does not contact the smelt in the molten pool 13.

[0048] like Figure 1 and Figure 2 As shown, in a specific embodiment, the heat absorption structure 21 has a first heat absorption tube 211 and / or a second heat absorption tube 212, the first heat absorption tube 211 is spirally arranged along the circumference of the furnace shell 12, and the second heat absorption tube 212 is coiled on the radial plane of the furnace shell 12, and the first heat absorption tube 211 and the second heat absorption tube 212 are both arranged close to the inner side of the furnace shell 12.

[0049] The furnace heat energy recovery device provided by the utility model can absorb the waste heat of high-temperature gas in the smelting chamber 11 and the radiant heat radiated from the steel liquid surface of the melting smelting to the side wall of the furnace shell 12 by arranging the first heat absorbing tube 211; and can absorb the waste heat of gas flowing vertically upward from the steel liquid surface of the melting smelting, and the radiant heat radiated from the steel liquid surface of the melting smelting to the top shell of the furnace shell 12 by arranging the second heat absorbing tube 212, so as to realize the all-round absorption of the waste heat of steel smelting; at the same time, the first heat absorbing tube 211 and the second heat absorbing tube 212 are both arranged close to the furnace shell 12, so as to protect the furnace shell 12 from the influence of the radiant heat from the steel liquid surface; further, the first heat absorbing tube 211 and the second heat absorbing tube 212 can also absorb the heat of the furnace shell 12 affected by the furnace body 1, so as to protect the furnace shell 12 from the influence of thermal deformation and improve the service life of the furnace body 1.

[0050] Specifically in the present embodiment, the first heat absorption tube 211 is spirally wound along the circumference of the furnace shell 12, and the flow direction of the heat storage medium in the first heat absorption tube 211 is spirally ascending. In other embodiments, the flow direction of the heat storage medium in the first heat absorption tube 211 can also be spirally descending, and there is no specific limitation on this. The outer wall of the first heat absorption tube 211 is arranged in contact with the inner wall of the furnace shell 12. In other embodiments, the outer wall of the first heat absorption tube 211 can also be close to the inner wall of the furnace shell 12 but not connected, and there is no specific limitation on this. The second heat absorption tube 212 in the present embodiment is coiled on the radial plane of the furnace shell 12, and the coiling method of the second heat absorption tube 212 is to coil sequentially from the center to the outside. In another embodiment, the second heat absorption tube 21 2 can also be coiled in sequence from the outer edge to the center. In other embodiments, the inlet of the second heat absorption tube 212 is adjacent to the outlet of the second heat absorption tube 212. The second heat absorption tube 212 is coiled in a manner of first coiling from the outer edge to the center to form a first coiling structure 2121, with a gap between adjacent pipes of the first coiling structure 2121, and then coiled from the center to the outer edge to form a second coiling structure 2122, the second coiling structure 2122 is coiled in the gap of the first coiling structure 2121 to form a shape. The arrangement of the second heat absorption tube can better match the detachable top cover of the existing furnace shell 12, avoiding the need to disassemble the pipeline first when disassembling the top cover, affecting the overall working efficiency of the furnace body heat energy recovery device, and there is no specific restriction on the coiling direction of the second heat absorption tube 212. In a specific embodiment, the flow direction of the heat storage medium in the second heat absorption tube 212 is from the outer edge to the center. In another specific embodiment, the flow direction of the heat storage medium in the second heat absorption tube 212 can also be from the center to the outer edge. In other embodiments, the flow direction of the heat storage medium in the second heat absorption tube 212 can also be from the outer edge to the center first, and then from the center to the outer edge, so as to better and more fully absorb the waste heat in the furnace body 1, and no specific limitation is made to this. In this embodiment, the upper wall of the second heat absorption tube 212 is arranged in contact with the top wall of the furnace shell 12. In other embodiments, the outer side wall of the second heat absorption tube 212 can also be arranged close to the inner side wall of the furnace shell 12, and the upper wall and the lower wall of the second heat absorption tube 212 are not arranged in contact with the furnace shell 12, and no specific limitation is made to this.

[0051] In this embodiment, the heat absorption mechanism 2 has two heat absorption structures 21 connected in parallel, and the two heat absorption structures 21 are arranged up and down along the height direction of the furnace body 1. The heat absorption structure 21 located at the bottom has a first heat absorption tube 211, and the heat absorption structure 21 located at the top has a first heat absorption tube 211 and a second heat absorption tube 212 connected in series. The first heat absorption tube 211 is arranged on the lower half of the heat absorption structure 21 located at the top, and the first heat absorption tube 211 is spirally arranged in contact with the inner wall of the furnace shell 12. The second heat absorption tube 212 is arranged in a coiled manner in contact with the inner top wall of the furnace shell 12, thereby realizing all-round protection of the furnace shell 12 and absorbing the waste heat of the furnace body 1.

[0052] like Figure 1 As shown, in a specific embodiment, the heat release structure 31 is formed by bending a heat release tube 311, and the heat release tube 311 has a plurality of heat release bends 3111, and two of the heat release bends 3111 connected at intervals are arranged at intervals along the radial direction or the circumferential direction of the preheating chamber 42.

[0053] The furnace heat energy recovery device provided by the utility model increases the flow length of the heat release tube 311 in the preheating chamber 42 by arranging a bent heat release tube 311, so that the heat release structure 31 releases heat more fully. At the same time, the two heat release elbows 3111 connected at intervals are arranged at intervals along the radial direction and the circumferential direction of the preheating chamber 42, so that the heat release tube 311 forms a plurality of gaps, which is convenient for DRI pellets (Direct Reduced Iron, DRI) to pass through the gaps of the heat release tube 311. At the same time, the two heat release elbows 3111 connected at intervals are arranged at intervals along the radial direction and the circumferential direction of the preheating chamber 42, and the uneven distribution of the bent heat release tubes 311 can be avoided, which leads to the situation that the smelting material in some areas is heated too fully and the smelting material in other areas is heated insufficiently.

[0054] Specifically in the present embodiment, the heat release tube 311 is formed by three bends. In other embodiments, there is no limit on the number of bends of the heat release tube 311. Among them, the bending directions of the two heat release bends 3111 connected at an interval in the present embodiment are the same, and the bending directions of the two adjacent heat release bends 3111 are opposite. In the two heat release bends 3111 connected at an interval in the present embodiment, one heat release bend 3111 is located radially outside the other heat release bend 3111 along the radial direction of the preheating chamber 42. The two heat release bends 3111 connected at an interval have a interval along the radial direction of the preheating chamber 42 to facilitate the passage of DRI pellets. In other embodiments, the two heat release bends 3111 connected at an interval can also be arranged at intervals along the circumferential direction of the preheating chamber 42, and there is no specific limit on this.

[0055] like Figure 1In a specific embodiment, the spacing distance between the two heat release bent pipes 3111 connected to each other is greater than 8 mm and less than 22 mm.

[0056] The furnace heat recovery device provided by the utility model limits the interval between the two heat-releasing bent pipes 3111 connected at an interval, so that a single DRI pellet can pass through the two heat-releasing bent pipes 3111 connected at an interval, and can also avoid problems such as poor heating effect caused by multiple DRI pellets passing through the same interval.

[0057] like Figure 1 As shown, in a specific embodiment, the feeding mechanism 4 also has a rotating structure 43 and a drum structure 44 that are meshed and connected, the preheating chamber 42 is formed in the drum structure 44, and when the rotating structure 43 rotates, the drum structure 44 is rotated around its central axis F.

[0058] The furnace heat recovery device provided by the utility model is provided with a rotating drum structure 44 and a rotating structure 43, which can drive the DRI pellets in the preheating chamber 42 to roll so that they are evenly mixed in the preheating chamber 42, thereby avoiding the problem that only the DRI pellets close to the heating tube are heated while the DRI pellets far away from the heating tube are not heated.

[0059] Specifically in this embodiment, the drum structure 44 is generally a cylindrical structure, the preheating chamber 42 is formed in the drum structure 44, the central axis F of the drum structure 44 is coaxially arranged with the axis D of the preheating chamber 42, the upper end of the drum structure 44 is open, and the heat release structure 31 extends from the upper end opening of the drum structure 44 into the preheating chamber 42, and the outer periphery of the drum structure 44 is provided with a gear ring 441, and the rotating structure 43 is provided with a rotatable gear part 431 and a motor 432, the gear part 431 is rotatably connected to the motor 432, and the gear part 431 is meshingly connected to the gear ring 441 of the drum structure 44. In other embodiments, the meshing connection mode of the drum structure 44 and the rotating structure 31 can also be other structures, and there is no specific limitation on this. In this embodiment, when the rotating structure 43 is rotating, the drum structure 44 rotates around its central axis F, that is, the preheating chamber 42 rotates around its axis D, so as to achieve the purpose of driving the DRI pellets to roll; in other embodiments, the central axis F of the drum structure 44 and the axis D of the preheating chamber 42 may not be coaxially arranged. In this embodiment, the rotation speed of the drum structure 44 is 60r / min to 100r / min, so as to achieve more sufficient preheating, avoid insufficient preheating due to excessive speed, and avoid excessive heating due to too low rotation speed, which may cause the DRI pellet surface to become sticky.

[0060] like Figure 1As shown, in a specific embodiment, the feed structure 41 has a feed gate 411 and a feed hopper 412, the feed gate 411 is openably arranged at the bottom of the drum structure 44, the inlet of the feed gate 411 is connected to the preheating chamber 42, the feed hopper 412 is arranged at the top of the furnace body 1, one end of the feed hopper 412 is connected to the smelting chamber 11, and the other end of the feed hopper 412 is connected to the outlet of the feed gate 411.

[0061] The furnace heat recovery device provided by the utility model, by providing a feed gate 411 and a feed hopper 412, facilitates the direct transportation of preheated DRI pellets from the preheating chamber 42 to the smelting chamber 11, thereby improving the transportation efficiency and avoiding the problem of poor preheating effect caused by too many transportation links.

[0062] Specifically in this embodiment, the feed gate 411 is an openable and closable gate structure, and the feed hopper 412 is an inverted funnel-type structure. The entrance of the feed hopper 412 is located below the exit of the feed gate 411. When the feed gate 411 is open, the DRI pellets fall directly from the preheating chamber 42 into the feed hopper 412, and are then transported to the smelting chamber 11 and enter the molten pool 13.

[0063] like Figure 1 As shown, in a specific embodiment, the furnace body heat energy recovery device also includes: a first pressurizing structure 5 for pumping the heat storage medium, the first pressurizing structure 5 has a heating chamber 51 for heating the heat storage medium, the outlet of the first pressurizing structure 5 is connected to the inlet of the heat absorption mechanism 2, and the inlet of the first pressurizing structure 5 is connected to the outlet of the heat release mechanism 3.

[0064] The furnace heat recovery device provided by the utility model provides a first pressurizing structure 5 for pumping a heat storage medium, so that the heat storage medium can absorb and utilize heat energy along the heat absorption structure 21 and the heat release structure 31. At the same time, the heat storage medium can also circulate along the heat absorption structure 21, the heat release structure 31, and the first pressurizing structure 5 to achieve recycling, and also achieve the function of continuously recovering waste heat during the entire smelting process. At the same time, a heating chamber 51 is provided, which can preliminarily heat the heat storage medium with a higher melting point when the furnace heat recovery device is first started, so that it becomes a flowable liquid, which is convenient for the first pressurizing structure 5 to pump.

[0065] Specifically in this embodiment, the heat storage medium uses cooling molten salt, which is solid at room temperature. Therefore, when the furnace heat energy recovery device is started for the first time, the cooling molten salt needs to be heated to 220°C~260°C in the heating chamber 51. Furthermore, the outlet of the first pressurized structure 5 is connected to the inlet of the heat absorption mechanism 2, that is, in this embodiment, the outlet of the first pressurized structure 5 is connected to the inlet of the two heat absorption structures 21; the inlet of the first pressurized structure 5 is connected to the outlet of the heat release mechanism 3, that is, the inlet of the first pressurized structure 5 is connected to the outlet of one end of the heat release pipe 311, thereby realizing a cyclic heat absorption and heat release system.

[0066] like Figure 1 As shown, in a specific embodiment, the furnace body heat energy recovery device also includes: a second pressurizing structure 6, the inlet of the second pressurizing structure 6 is connected to the outlet of the heat absorbing mechanism 2, and the outlet of the second pressurizing structure 6 is connected to the inlet of the heat releasing mechanism 3.

[0067] The furnace heat energy recovery device provided by the utility model provides a second pumping force for the heat storage medium that has absorbed heat by adding a second pressurizing structure 6 between the heat absorption mechanism 2 and the heat release mechanism 3, thereby solving the problem that the heat storage medium after absorbing heat cannot be transported to the heat release structure 31 due to the height difference between the furnace body 1 and the preheating chamber 42, and realizing efficient heat energy transmission of the furnace heat energy recovery device. Specifically in this embodiment, the inlet of the second pressurizing structure 6 is connected to the outlets of the two heat absorption structures 21, and the outlet of the second pressurizing structure 6 is connected to the inlet of the heat release structure 31.

[0068] like Figure 1 and Figure 2 As shown, in a specific embodiment, the flow rate of the heat storage medium in the first heat absorption tube 211 and / or the second heat absorption tube 212 is 200 L·s -1 ·m -2 ~400L·s -1 ·m -2 .

[0069] The furnace heat energy recovery device provided by the utility model ensures the heat absorption capacity of the first heat absorption tube 211 and the second heat absorption tube 212 by limiting the flow rate of the heat storage medium in the first heat absorption tube 211 and the second heat absorption tube 212, thereby avoiding the problem that the heat storage medium absorbs too much heat due to too small a flow rate of the heat storage medium, thereby affecting the temperature environment required for steel smelting, that is, affecting the normal operation of steel smelting; and also avoiding the problem that the heat storage medium absorbs too little heat due to too large a flow rate of the heat storage medium, thereby causing the heating efficiency of the DRI pellets in the preheating chamber 42 to be too low and failing to play a preheating role.

[0070] like Figure 1As shown, in a specific embodiment, the temperature of the heat storage medium at the outlet of the heat absorption structure 21 is 300°C.

[0071] Specifically in this embodiment, the furnace heat energy recovery device provided by the utility model can increase the temperature of the heat storage medium from 220°C to 260°C to 300°C through the heat absorption mechanism 2, and the heat storage medium can preheat the DRI pellets in the preheating chamber 42, so that the temperature of the DRI pellets entering the smelting chamber 11 is higher than 200°C, thereby improving the smelting efficiency of steel smelting and also improving the heat recovery rate of waste heat recovery from steel smelting.

[0072] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific embodiment of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A furnace heat recovery device, characterized in that: It is arranged on a furnace body having a smelting chamber, wherein the smelting chamber is divided and formed by a molten pool and a furnace shell covering the molten pool. The furnace body heat energy recovery device comprises: A heat absorption mechanism, located in the smelting chamber; A heat release mechanism is arranged on the outside of the furnace body, the heat release mechanism is connected with the heat absorption mechanism, and the heat release mechanism has a heat release structure for releasing heat energy; The feeding mechanism comprises a feeding structure and a preheating chamber for accommodating smelting materials, wherein the feeding structure is respectively connected with the preheating chamber and the smelting chamber, and the heat release structure is arranged in the preheating chamber.

2. The furnace heat recovery device according to claim 1, characterized in that: The heat absorbing mechanism has at least two heat absorbing structures, at least two of the heat absorbing structures are adjacently arranged along the height direction of the furnace body, and at least two of the heat absorbing structures are located above the molten pool.

3. The furnace heat recovery device according to claim 2, characterized in that: The heat absorption structure comprises a first heat absorption tube and / or a second heat absorption tube, wherein the first heat absorption tube is spirally arranged along the circumference of the furnace shell, and the second heat absorption tube is coiled on the radial plane of the furnace shell, and the first heat absorption tube and the second heat absorption tube are both arranged close to the inner side of the furnace shell.

4. The furnace heat recovery device according to claim 1, characterized in that: The heat release structure is formed by bending a heat release pipe, and the heat release pipe has a plurality of heat release bends, and two heat release bends connected at intervals are arranged at intervals along the radial direction or the circumferential direction of the preheating chamber.

5. The furnace heat recovery device according to claim 4, characterized in that: The spacing distance between the two heat release elbows connected at intervals is greater than 8 mm and less than 22 mm.

6. The furnace heat recovery device according to claim 1, characterized in that: The feeding mechanism also has a rotating structure and a drum structure that are meshed and connected, the preheating chamber is formed in the drum structure, and when the rotating structure rotates, the drum structure is rotatably arranged around its central axis.

7. The furnace heat recovery device according to claim 6, characterized in that: The feeding structure comprises a feeding gate and a feeding hopper. The feeding gate is openably arranged at the bottom of the drum structure, the inlet of the feeding gate is connected with the preheating chamber, the feeding hopper is arranged at the top of the furnace body, one end of the feeding hopper is connected with the smelting chamber, and the other end of the feeding hopper is connected with the outlet of the feeding gate.

8. The furnace heat recovery device according to claim 2, characterized in that: The furnace heat energy recovery device also includes: a first pressurizing structure for pumping the heat storage medium, the first pressurizing structure having a heating chamber for heating the heat storage medium, the outlet of the first pressurizing structure being connected to the inlet of the heat absorbing mechanism, and the inlet of the first pressurizing structure being connected to the outlet of the heat releasing mechanism.

9. The furnace heat recovery device according to claim 8, characterized in that: The furnace heat recovery device further includes: a second pressurizing structure, the inlet of the second pressurizing structure is connected to the outlet of the heat absorbing mechanism, and the outlet of the second pressurizing structure is connected to the inlet of the heat releasing mechanism.

10. The furnace heat recovery device according to claim 3, characterized in that: The flow rate of the heat storage medium in the first heat absorption tube and / or the second heat absorption tube is 200 L·s -1 ·m -2 ~400L·s -1 ·m -2 .

11. The furnace heat recovery device according to claim 8, characterized in that: The temperature of the heat storage medium at the outlet of the heat absorption structure is 300°C.

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