A heat extraction bin and molten steel slag heat recovery device

Abstract

The present invention discloses a heat extraction chamber and a molten steel slag heat recovery device, including a chamber body and a chamber door. The chamber door is rotatably connected to the chamber body, and the chamber door can form a closed space with the chamber body. The chamber body includes a steel structure framework; refractory bricks for fixedly connecting to the steel structure framework; a first heat insulation felt for covering the outside of the refractory bricks. Among them, a heat exchange device is provided at the top of the chamber body, including a capsule-type pressure vessel, a steam rising pipe, a condensate descending pipe, a make-up water pipe, and a second heat insulation felt. The second heat insulation felt covers the capsule-type pressure vessel to form a heat insulation surface, the lower surface of the capsule-type pressure vessel is a heat exchange surface, and saturated water is contained in the capsule-type pressure vessel. The present invention realizes the utilization of the radiant heat of molten steel slag, saves energy, reduces the damage degree of the high-temperature roller press crusher, prolongs the service life of the roller press crusher, and reduces the equipment maintenance rate.

Description

Technical Field

[0001] The present invention relates to the technical field of steel slag waste heat recovery, and particularly to a heat extraction bin and a molten steel slag heat recovery device. Background Art

[0002] For every 1 ton of steel produced, about 0.12 - 0.14 tons of steel slag is generated. In 2019, the steel slag production in China was about 110 million tons, and the utilization of steel slag waste heat was almost zero, resulting in huge energy waste.

[0003] The steel slag roller pressing and crushing with pressure heat soaking process technology has realized the continuity, equipmentization and automation of steel slag treatment in China. Usually, the molten steel slag still has a high temperature of about 1500 °C before entering the roller press crusher, but the steel slag temperature around 1200 °C can meet the operation requirements of entering the roller press crusher. There is a temperature difference of 300 °C from 1500 °C to 1200 °C, and there is great potential for waste heat recovery.

[0004] Therefore, how to realize the recovery and utilization of the radiant heat of molten steel slag, and reduce the damage degree of the high temperature to the roller press crusher and extend the service life of the roller press crusher have become the problems to be solved by the present invention. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem of how to cool high-temperature steel slag and simultaneously recover heat, and a method for utilizing steel slag waste heat with a heat extraction bin and a molten steel slag heat recovery device is proposed.

[0006] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0007] A heat extraction bin includes a bin body and a bin door. The bin door is rotatably connected to the bin body, and the bin door can form a closed space with the bin body. The bin body includes a steel structure frame; refractory bricks for fixedly connecting to the steel structure frame; a first heat insulation felt for covering the outside of the refractory bricks; wherein, a heat exchange device is provided at the top of the bin body, a capsule-type pressure vessel, a steam riser pipe, a condensate downcomer pipe, a makeup water pipe, and a second heat insulation felt. Among them, the second heat insulation felt covers the capsule-type pressure vessel to form a heat insulation surface, the lower surface of the capsule-type pressure vessel is a heat exchange surface, and saturated water is contained in the capsule-type pressure vessel.

[0008] Preferably, the number N of the heat extraction bins is jointly determined by the slag feeding frequency and the heat exchange time of a single heat extraction bin. The specific calculation formula is N = {T1 / T2} + 1, where T1 is the time of the whole process, T2 is the heat exchange time of a single heat extraction bin, the symbol {} is rounding up, and T2 should be within 1h - 1.5h.

[0009] Preferably, the first heat insulation felt and the second heat insulation felt are made of rock wool or slag wool, the thermal conductivity of the refractory brick is less than 1.5, and the refractory brick is made of high-aluminum brick or corundum brick.

[0010] A molten steel slag heat recovery device, the recovery device includes a mobile base; and a slag pot movably connected above the mobile base; wherein, the top of the mobile base is fixedly connected to a support plate through a pillar, a lifting column is slidably connected to the support plate, a driving part is arranged in the heat extraction bin, the upper end of the lifting column is fixed to the slag pot, and the lower end is connected to the output end of the driving part, and the driving part is used to drive the lifting column to move up and down on the support plate.

[0011] Preferably, the driving part includes a first motor fixedly connected to the outer wall of the heat extraction bin, the output end of the first motor is fixedly connected to a rotating shaft, a cam is fixedly connected to the rotating shaft, the lower end of the lifting column is in sliding fit with the outer surface of the cam, and a support component for supporting the rotating shaft is arranged on the mobile base.

[0012] Preferably, the support component includes at least one first roller fixedly connected to the rotating shaft; at least one second roller corresponding to and in contact with the first roller; wherein, the second roller is rotatably connected to the mobile base.

[0013] Preferably, the mobile base includes a plurality of sealed cavities, a first piston is hermetically and slidably connected in the plurality of sealed cavities, the upper end of the first piston is fixedly connected to a push rod, the upper end of the push rod is fixedly connected to a pressing plate, a first spring is sleeved on the push rod, and both ends of the first spring are respectively abutted against the sealed cavity and the pressing plate. There is a cavity in the mobile base, a second piston is hermetically and slidably connected in the cavity, the lower end of the second piston is fixedly connected to a support rod, the lower end of the support rod passes through the bottom wall of the mobile base and extends downward, and the extended end of the support rod is fixedly connected to a chuck. A second spring is sleeved on the support rod, and both ends of the second spring are respectively abutted against the second piston and the inner wall of the bottom of the cavity. The pressing plate abuts against the outer surface of the cam, and the sealed cavity is communicated with the cavity through a sealed pipeline.

[0014] Preferably, a one-way valve is arranged on the sealed pipeline, and a deflation valve is arranged on the cavity.

[0015] Preferably, the upper end of the lifting column is fixedly connected to a bottom support, and one end of the bottom support away from the lifting column abuts against the slag pot.

[0016] Preferably, a clamping plate is slidably connected to the bottom of the support plate. A through groove is formed in the clamping plate. The lifting column is slidably connected in the through groove. A clamping groove is provided on the side wall of the bottom of the lifting column. One end of the through groove is fixedly connected with a clamping block matching the clamping groove. A stop block is fixedly connected to the bottom of the support plate. A third spring is connected between the stop block and the clamping plate. A protrusion is fixedly connected to the inner wall of the heat extraction chamber, and the protrusion abuts against the clamping plate.

[0017] Compared with the prior art, the present invention provides a method for utilizing the waste heat of steel slag, having the following beneficial effects:

[0018] By placing the molten steel slag in the slag pot and adding a crushing plow, a capsule-type pressure vessel, and a steam drum at the top of the heat extraction chamber, the present invention can realize the utilization of the radiant heat of the molten steel slag. While saving energy, it reduces the damage degree of the high-temperature roller press crusher, prolongs the service life of the roller press crusher, and reduces the equipment maintenance rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a method for utilizing the waste heat of steel slag proposed by the present invention;

[0020] Figure 2 is a schematic structural diagram of a heat extraction chamber and a molten steel slag heat recovery device proposed by the present invention Figure 1 ;

[0021] Figure 3 is a schematic structural diagram of a heat extraction chamber and a molten steel slag heat recovery device proposed by the present invention Figure 2 ;

[0022] Figure 4 is a schematic structural diagram of a heat extraction chamber proposed by the present invention;

[0023] Figure 5 is a partial schematic structural diagram of a heat extraction chamber and a molten steel slag heat recovery device proposed by the present invention;

[0024] Figure 6 is a Figure 2 schematic structural diagram of part A of a heat extraction chamber and a molten steel slag heat recovery device proposed by the present invention;

[0025] Figure 7 is a Figure 6 schematic structural diagram of part C of a heat extraction chamber and a molten steel slag heat recovery device proposed by the present invention;

[0026] Figure 8 is a schematic structural diagram of a molten steel slag treatment crushing plow proposed by the present invention Figure 1 ;

[0027] Figure 9Structural schematic of a slag-breaking plow for molten steel slag treatment proposed by the present invention Figure 2 ;

[0028] Figure 10 A slag-breaking plow for molten steel slag treatment proposed by the present invention Figure 8 Schematic diagram of the structure of part D in

[0029] Figure 11 A slag-breaking plow for molten steel slag treatment proposed by the present invention Figure 8 Schematic diagram of the structure of part E in

[0030] In the figure: 101, slag pot; 2, roller crusher; 3, steam drum; 4, heat extraction chamber; 5, overhead crane; 6, steel slag transportation device; 401, steel structure frame; 402, first heat insulation felt; 403, refractory brick; 404, first motor; 405, rotating shaft; 406, cam; 407, first roller; 408, second roller; 409, capsule-type pressure vessel; 4091, second heat insulation felt; 410, steam riser; 411, condensate downcomer; 412, make-up water pipe; 413, protrusion; 414, clamping plate; 415, through groove; 417, clamping block; 418, clamping groove; 419, third spring; 420, stop block; 601, moving base; 603, support column; 604, support plate; 608, lifting column; 609, bottom support; 7, sealing cavity; 701, first piston; 702, push rod; 703, first spring; 704, pressing plate; 705, sealing pipeline; 7051, check valve; 706, cavity; 707, second piston; 708, support rod; 709, chuck; 710, second spring; 8, air release valve; 9, counterweight platform; 901, connecting part; 902, box body; 903, second motor; 904, output shaft; 905, winch; 906, steel wire rope; 907, limit plate; 908, rack; 909, pulley block; 910, plow shaft; 911, transmission sleeve; 912, pin shaft; 913, gear; 914, second bevel gear; 915, first bevel gear; 916, fixed sleeve; 917, connecting rod; 918, first sprocket; 919, chain; 920, second sprocket; 921, plow head; 922, slider; 923, chute. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0032] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0033] Embodiment 1:

[0034] Please refer to Figure 2-7 , this embodiment discloses a heat extraction chamber, including a chamber body and a chamber door. The chamber door is rotatably connected to the chamber body, and the chamber door can form a closed space with the chamber body. The chamber body includes a steel structure frame 401; refractory bricks 403 for fixedly connecting to the steel structure frame 401; a first heat insulation felt 402 for covering the outside of the refractory bricks 403; wherein, a heat exchange device is provided at the top of the chamber body, including a capsule-shaped pressure vessel 409, a steam riser 410, a condensate downcomer 411, a make-up water pipe 412, and a second heat insulation felt 4091. Among them, the second heat insulation felt 4091 covers the capsule-shaped pressure vessel 409 to form a heat insulation surface, the lower surface of the capsule-shaped pressure vessel 409 is a heat exchange surface, and saturated water is contained in the capsule-shaped pressure vessel 409.

[0035] Preferably, the number N of the heat extraction chambers 4 is jointly determined by the slag incoming frequency and the heat exchange time of a single heat extraction chamber 4. The specific calculation formula is N = {T1 / T2} + 1, where T1 is the time of the entire process, T2 is the heat exchange time of a single heat extraction chamber 4, the symbol {} is for rounding up, and T2 should be within 1h - 1.5h.

[0036] The first heat insulation felt 402 is made of rock wool or slag wool, the thermal conductivity of the refractory bricks 403 is less than 1.5, and the refractory bricks 403 are made of high-aluminum bricks or corundum bricks.

[0037] When the heat extraction chamber 4 is in use, the slag ladle 101 filled with molten steel slag enters the heat extraction chamber 4 through the steel slag transportation device 6. After closing the chamber door, heat is extracted by the heat exchange device; the capsule-shaped pressure vessel 409 exchanges heat with the molten steel slag; the saturated water in the capsule-shaped pressure vessel 409 becomes pressurized steam. When the steam pressure reaches the threshold value of the electric control valve on the steam riser 410, the valve will open, and the threshold value of the electric control valve is determined according to the pressure grade of the capsule-shaped pressure vessel 409; then the pressurized steam enters the steam drum 3 through the steam riser 410 for steam-water separation, and the condensed saturated water returns to the capsule-shaped pressure vessel 409 through the condensate downcomer 411; when the saturated water in the capsule-shaped pressure vessel 409 is insufficient, deaerated water is supplemented through the make-up water pipe 412, finally achieving the balance and circulation of the working medium; the heat exchange device absorbs the radiant heat of the molten steel slag and converts it into pressurized steam for output to achieve the purpose of heat extraction.

[0038] Example 2:

[0039] Please refer to Figure 2-7 , on the basis of Example 2, this example discloses a molten steel slag heat recovery device. The recovery device includes a moving base 601; and a slag pot 101 movably connected above the moving base 601. Among them, the top of the moving base 601 is fixedly connected to a support plate 604 through a pillar 603. A lifting column 608 is slidably connected to the support plate 604. A driving part is provided in the heat extraction bin. The upper end of the lifting column 608 is fixed to the slag pot 101, and the lower end is connected to the output end of the driving part. The driving part is used to drive the lifting column 608 to move up and down on the support plate 604. When in use, by moving the moving base 601 into the heat extraction chamber 4 and closing the chamber door, in this example, the slag pot 101 is set to be movable and supported by the lifting column 608 at the bottom. At the same time, the driving part drives the lifting column 608 to reciprocate up and down, thereby driving the slag pot 101 to move up and down, and cooperating with the plow head 921 on the slag pot 101, so that the internal molten steel slag is fully impacted, improving the heat dissipation effect and preventing the surface of the molten steel slag from cooling.

[0040] Refer to Figure 2-7, this embodiment is basically the same as Embodiment 3. Further, the driving part includes a first motor 404 fixedly connected to the outer wall of the heat extraction bin. The output end of the first motor 404 is fixedly connected with a rotating shaft 405. A cam 406 is fixedly connected to the rotating shaft 405. The lower end of the lifting column 608 is in sliding fit with the outer surface of the cam 406. A supporting component for supporting the rotating shaft 405 is provided on the moving base 601. The supporting component includes at least one first roller 407 fixedly connected to the rotating shaft 405; at least one second roller 408 corresponding to and in fit with the first roller 407; wherein, the second roller 408 is rotatably connected to the moving base 601. The upper end of the lifting column 608 is fixedly connected with a bottom support 609. One end of the bottom support 609 away from the lifting column 608 abuts against the slag pot 101. A clamping plate 414 is slidably connected to the bottom of the support plate 604. A through groove 415 is formed in the clamping plate 414. The lifting column 608 is slidably connected in the through groove 415. A clamping groove 418 is provided on the side wall of the bottom of the lifting column 608. A clamping block 417 matching the clamping groove 418 is fixedly connected to one end of the through groove 415. A stop block 420 is fixedly connected to the bottom of the support plate 604. A third spring 419 is connected between the stop block 420 and the clamping plate 414. A protrusion 413 is fixedly connected to the inner wall of the heat extraction bin. The protrusion 413 abuts against the clamping plate 414. When the moving base 601 moves on the track into the heat extraction chamber 4, the rotating shaft 405 extends into the space between the moving base 601 and the support plate 604. At the same time, by the abutment of the protrusion 413 against the clamping plate 414, the clamping plate 414 is driven to slide at the bottom of the support plate 604, so that the clamping block 417 moves out of the clamping groove 418 at the bottom side edge of the lifting column 608, thereby releasing the locking of the lifting column 608. When the moving base 601 reaches the preset position, the lifting column 608 is located above the rotating shaft 405 and is in fit with the outer surface of the cam 406. In order to improve the support of the rotating shaft 405, a second roller 408 corresponding to the first roller 407 is provided on the moving base 601, so as to support the rotating shaft 405. Then the first motor 404 is started to drive the rotating shaft 405 to rotate, and then drive the cam 406 to rotate, so as to realize the up and down movement of the lifting column 608, driving the slag pot 101 to rise and fall.

[0041] Please refer to Figure 2 , Figure 6 , Figure 7, in order to improve the stability of the mobile base 601 in this embodiment, the following technical means are adopted: The mobile base 601 includes a plurality of sealed cavities 7. A first piston 701 is hermetically and slidably connected in the plurality of sealed cavities 7. The upper end of the first piston 701 is fixedly connected to a push rod 702. The upper end of the push rod 702 is fixedly connected to a pressing plate 704. A first spring 703 is sleeved on the push rod 702. Both ends of the first spring 703 abut against the sealed cavity 7 and the pressing plate 704 respectively. A cavity 706 is provided in the mobile base 601. A second piston 707 is hermetically and slidably connected in the cavity 706. The lower end of the second piston 707 is fixedly connected to a support rod 708. The lower end of the support rod 708 passes through the bottom wall of the mobile base 601 and extends downward. And the extended end of the support rod 708 is fixedly connected to a chuck 709. A second spring 710 is sleeved on the support rod 708. Both ends of the second spring 710 abut against the second piston 707 and the inner wall of the bottom of the cavity 706 respectively. The pressing plate 704 abuts against the outer surface of the cam 406. The sealed cavity 7 and the cavity 706 are communicated through a sealed pipeline 705. Preferably, a check valve 7051 is provided on the sealed pipeline 705. An air release valve 8 is provided on the cavity 706. While the cam 406 is rotating, when the end face of the cam 406 far from the axis of the rotating shaft 405 is below the axis of the rotating shaft 405, please refer to Figure 6 , it abuts against the pressing plate 704. Furthermore, the pressing plate 704 pushes the first piston 701 to slide downward in the sealed cavity 7 through the push rod 702, and conveys the air pressure in the sealed cavity 7 to the cavity 706 through the sealed pipeline 705. Then it drives the second piston 707 to slide downward in the cavity 706, thereby driving the chuck 709 to abut against the inner wall of the bottom of the heat extraction chamber 4. Anti-slip lines matching the chuck 709 can be provided below the chuck 709, so as to realize the fixing effect of the mobile base 601. The presence of the first spring 703 and the second spring 710 enables the first piston 701 and the second piston 707 to automatically reset. It should be noted that this embodiment also includes a check valve 7051, an air release valve 8 and an air overflow valve. The presence of the check valve 7051 is to prevent the air flow direction from being guaranteed to enter the cavity 706 when the first piston 701 moves downward, while drawing external air when the first piston 701 moves upward. The presence of the air release valve 8 is to release air when unlocking is required, so as to realize the reset of the second piston 707 through the second spring 710. The air overflow valve is not shown in this figure. Its main function is to automatically discharge the excess gas in the cavity 706 after the cavity 706 is inflated multiple times to reach the preset value.

[0042] Embodiment 3:

[0043] Please refer to Figure 8-11, on the basis of Embodiment 1, this embodiment discloses a slag-breaking plow for molten steel slag treatment, which includes a frame; a plow shaft 910 that can move up and down on the frame; a transmission sleeve 911 is rotatably connected to the frame, and the plow shaft 910 is slidably connected inside the transmission sleeve 911; it also includes a power device that can move the plow shaft 910 up and down inside the transmission sleeve 911 and rotate the transmission sleeve 911 on the frame; it further includes a plow head 921 fixedly connected to the bottom of the plow shaft 910. When in use in this embodiment, the power device is used to drive the plow shaft 910 to slide up and down inside the transmission sleeve 911. At the same time, in order to change the contact position between the plow head 921 at the bottom of the plow shaft 910 and the steel slag, it is necessary for the plow head 921 to rotate itself every time it contacts the steel slag in the slag pot 101. Thus, the power device synchronously drives the transmission sleeve 911 to rotate on the counterweight platform 9, so as to realize the uniform impact of the plow head 921 on the surface of the steel slag. Specifically as follows:

[0044] Please refer to Figure 8, the frame includes a counterweight platform 9 and a box body 902 fixedly connected to the top of the counterweight platform 9. The transmission sleeve 911 is rotatably connected to the counterweight platform 9. The plow shaft 910 penetrates the counterweight platform 9. The plow head 921 is located below the counterweight platform 9. The power device is located inside the box body 902. The plow shaft 910, the plow head 921 and the power device are at least one group. The power device includes a second motor 903 fixedly connected to the bottom of the box body 902. The output end of the second motor 903 is fixedly connected with an output shaft 904. One end of the output shaft 904 away from the second motor 903 is fixedly connected with a winch 905. A steel wire rope 906 is wound on the winch 905. A pulley block 909 is rotatably connected inside the box body 902. The steel wire rope 906 bypasses the pulley block 909 and is fixed to the top of the plow shaft 910. The power device further includes a limiting plate 907 fixedly connected inside the box body 902, and a rack 908 fixedly connected to the steel wire rope 906. Among them, the rack 908 fits and slides with the limiting plate 907. A pin shaft 912 is rotatably connected inside the box body 902. The pin shaft 912 is fixedly connected with a gear 913 and a bevel gear 913 in sequence. The gear 913 meshes with the rack 908. A fixed sleeve 916 is fixedly connected to the inner wall of the box body 902. A connecting rod 917 is rotatably connected inside the fixed sleeve 916. Synchronous mechanisms are provided between the connecting rod 917 and the transmission sleeve 911 and the pin shaft 912 respectively. The synchronous mechanism is used to make the connecting rod 917 and the transmission sleeve 911 rotate synchronously. In this embodiment, the second motor 903 is a reversible motor, and its number of positive and negative rotation turns can be set through a controller. After the second motor 903 is started, it drives the winch 905 to wind and unwind the steel wire rope 906, and then realizes the sliding of the steel wire rope 906 on the pulley block 909. Further, the other end of the steel wire rope 906 pulls the plow shaft 910 to move upward, thereby driving the plow head 921 to move upward. At the same time, when pulling the plow shaft 910 to move upward, the steel wire rope 906 drives the rack 908 to move up and down. Further, the rack 908 meshes with the gear 913 on the pin shaft 912, thereby driving the connecting rod 917 to operate through the synchronous mechanism and realizing the rotation of the transmission sleeve 911. The synchronous mechanism can adopt bevel gear transmission or other friction transmissions. The following uses two synchronous mechanisms to realize the rotation of the transmission sleeve 911:

[0045] Specifically, the synchronization mechanism between the connecting rod 917 and the transmission sleeve 911 includes a first sprocket 918 fixedly connected to the bottom of the connecting rod 917; a second sprocket 920 fixedly connected to the outer wall of the transmission sleeve 911; and a chain 919 sleeved on the first sprocket 918 and the second sprocket 920. The synchronization mechanism between the connecting rod 917 and the pin shaft 912 includes a first bevel gear 915 fixedly connected to the top of the connecting rod 917; and a second bevel gear 914 fixedly connected to the pin shaft 912. The first bevel gear 915 and the second bevel gear 914 mesh with each other. By the rotation of the gear 913, the second bevel gear 914 is rotated, and then the first bevel gear 915 meshing with it rotates synchronously, further driving the connecting rod 917 to rotate within the fixed sleeve 916, further driving the first sprocket 918 at the bottom of the connecting rod 917 to rotate, and then the first sprocket 918 drives the second sprocket 920 on the outer wall of the transmission sleeve 911 to rotate through the chain 919. When the second motor 903 reverses, the plow shaft 910 and the plow head 921 impact the steel slag under their own weight, and the plow head 921 knocks on the slag shell on the surface of the hot steel slag. The material of the plow head 921 is heat-resistant steel, and the heat-resistant temperature is greater than 600°C.

[0046] The transmission sleeve 911 is rotatably connected to the counterweight platform 9 through a bearing. A slider 922 is fixedly connected to the inner wall of the transmission sleeve 911. A chute 923 is formed on the plow shaft 910, and the slider 922 is slidably connected in the chute 923. A connecting portion 901 is fixedly connected to the bottom of the counterweight platform 9, and the connection with the steel structure frame 401 on the heat extraction chamber 4 is achieved through the connecting portion 901. The plow head 921 of the present invention is balanced at a certain height above the slag pot 101 through the counterweight platform 9. The plow head 921 descends through the power device to knock on the slag shell on the surface of the hot steel slag. The plow head 921 should adjust the rotation angle and knocking frequency according to the diameter of the slag pot 101. The specific operation process is that the plow head 921 descends to knock on the slag shell and then rises, rotates a certain angle and then descends again to knock on the slag shell and then rises, repeating this operation until the heat exchange process ends. The range of the angle is 30°-90°, and the angle is determined according to the diameter of the slag pot 101.

[0047] The method for utilizing the waste heat of steel slag includes the following steps: S1: Pour the hot steel slag into the slag pot 101, and enter the heat extraction chamber 4 through the steel slag transportation device 6 via the track to extract heat using the heat exchange device; S2: Use the slag breaking plow assembly to strike the surface of the hot steel slag in the slag pot 101 to release the radiant heat of the hot steel slag, and the heat exchange device absorbs the radiant heat of the hot steel slag and converts it into pressurized steam for output; S3: The pressurized steam enters the steam drum 3 for steam-water separation; S4: After steam-water separation, the steam is incorporated into the steel plant steam pipe network or utilized locally, and the saturated water returns to the heat exchange device to participate in the working medium cycle again; S5: Repeat steps S1-S4 for multiple slag pots 101 to complete the heat extraction process; S6: Open the hatch, and the cooled hot steel slag is in the slag pot 101, and leaves the heat extraction chamber 4 through the steel slag transportation device 6 via the track, and use the overhead crane 5 to transport the slag pot 101 to the roller press crusher 2 for subsequent treatment; S7: Repeat step S6 for multiple slag pots 101 to achieve the process cycle.

[0048] The advantages of the present invention are that the effective utilization of the radiant heat of molten steel slag is realized in terms of method and technology, which is of great significance for reducing the comprehensive energy consumption of iron and steel enterprises.

[0049] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A molten steel slag heat recovery device, comprising a heat extraction bin, the heat extraction bin including a bin body and a bin door, the bin door being rotatably connected to the bin body, the bin door being capable of forming a closed space with the bin body, characterized in that, The cabin body includes a steel structure frame (401); refractory bricks (403) for fixedly connecting to the steel structure frame (401); a first heat insulation felt (402) for covering the outside of the refractory bricks (403); wherein, a heat exchange device is provided at the top of the cabin body. The heat exchange device includes a capsule-shaped pressure vessel (409), a steam rising pipe (410), a condensate descending pipe (411), a water replenishing pipe (412), and a second heat insulation felt (4091). Among them, the second heat insulation felt (4091) covers the capsule-shaped pressure vessel (409) to form a heat insulation surface. The lower surface of the capsule-shaped pressure vessel (409) is a heat exchange surface. The capsule-shaped pressure vessel (409) is filled with saturated water. It is characterized in that: the recovery device includes a mobile base (601); and a slag pot (101) movably connected above the mobile base (601); wherein, the top of the mobile base (601) is fixedly connected to a support plate (604) through a pillar (603). A lifting column (608) is slidably connected to the support plate (604). A driving part is provided in the heat extraction bin. The upper end of the lifting column (608) is fixed to the slag pot (101), and the lower end is connected to the output end of the driving part. The driving part is used to drive the lifting column (608) to move up and down on the support plate (604); The driving part includes a first motor (404) fixedly connected to the outer wall of the heat extraction bin. The output end of the first motor (404) is fixedly connected to a rotating shaft (405). A cam (406) is fixedly connected to the rotating shaft (405). The lower end of the lifting column (608) is in sliding contact with the outer surface of the cam (406). A support component for supporting the rotating shaft (405) is provided on the mobile base (601); The support component includes at least one first roller (407) fixedly connected to the rotating shaft (405); at least one second roller (408) corresponding to and in contact with the first roller (407); wherein, the second roller (408) is rotatably connected to the mobile base (601); The movable base (601) includes a plurality of sealed cavities (7). A first piston (701) is sealingly and slidably connected in the plurality of sealed cavities (7). The upper end of the first piston (701) is fixedly connected to a push rod (702). The upper end of the push rod (702) is fixedly connected to a pressing plate (704). A first spring (703) is sleeved on the push rod (702). Two ends of the first spring (703) respectively abut against the sealed cavity (7) and the pressing plate (704). A cavity (706) is provided in the movable base (601). A second piston (707) is sealingly and slidably connected in the cavity (706). The lower end of the second piston (707) is fixedly connected to a support rod (708). The lower end of the support rod (708) passes through the bottom wall of the movable base (601) and extends downward. And the extended end of the support rod (708) is fixedly connected to a chuck (709). A second spring (710) is sleeved on the support rod (708). Two ends of the second spring (710) respectively abut against the second piston (707) and the inner wall of the bottom of the cavity (706). The pressing plate (704) abuts against the outer surface of the cam (406). The sealed cavity (7) is communicated with the cavity (706) through a sealed pipeline (705); A one-way valve (7051) is provided on the sealed pipeline (705). A deflation valve (8) is provided on the cavity (706); The number N of the heat extraction chambers (4) is jointly determined by the slag incoming frequency and the heat exchange time of a single heat extraction chamber (4). The specific calculation formula is N = {T1 / T2}+1, where T1 is the time of the whole process, T2 is the heat exchange time of a single heat extraction chamber (4), the symbol {} is rounding up, and T2 should be within 1h - 1.5h.

2. The molten steel slag heat recovery device according to claim 1, characterized in that, The first heat insulation felt (402) and the second heat insulation felt (4091) are made of rock wool or slag wool. The thermal conductivity of the refractory brick (403) is less than 1.

5. The refractory brick (403) is made of high-aluminum brick or corundum brick.

3. The molten steel slag heat recovery device according to claim 1, characterized in that, The upper end of the lifting column (608) is fixedly connected to a bottom support (609). One end of the bottom support (609) away from the lifting column (608) abuts against the slag pot (101).

4. The molten steel slag heat recovery device according to claim 1, characterized in that, A clamping plate (414) is slidably connected to the bottom of the support plate (604). A through groove (415) is formed in the clamping plate (414). The lifting column (608) is slidably connected in the through groove (415). A clamping groove (418) is provided on the side wall of the bottom of the lifting column (608). One end of the through groove (415) is fixedly connected to a clamping block (417) matching the clamping groove (418). A stop block (420) is fixedly connected to the bottom of the support plate (604). A third spring (419) is connected between the stop block (420) and the clamping plate (414). A protrusion (413) is fixedly connected to the inner wall of the heat extraction chamber. The protrusion (413) abuts against the clamping plate (414).

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