A molten steel slag waste heat recovery device

Abstract

The present invention discloses a molten steel slag waste heat recovery device, which relates to the technical field of steel slag treatment and is particularly applicable to the waste heat recovery treatment and coarse crushing treatment of molten steel slag. The device includes a recovery chamber, which is composed of a heat extraction housing, a housing wall frame, and a heat exchange cooling bed. A membrane wall heat exchanger is arranged in the heat extraction housing, the heat exchange cooling bed is composed of a combination of multiple heat exchange bed plates, and a slag extrusion head is arranged in the housing wall frame. The design of the present invention is reasonable and the principle is simple. It adopts a heat exchange method combining wall heat exchange and thermal radiation heat exchange, can effectively and quickly complete the waste heat recovery and coarse crushing of molten steel slag, without any waste of water resources throughout the process. It uses dry dust removal and does not require water treatment equipment such as sedimentation tanks, with few energy-consuming devices. The steel slag is not easily adhered to the equipment, and the equipment wear is small. The waste heat recovery is carried out in a closed space, significantly improving the high-temperature situation in the working area, making it more convenient for the long-term operation and maintenance of the equipment. The equipment can be continuously laid in parallel, significantly improving the working efficiency, and is suitable for large-scale promotion.

Description

Technical Field

[0001] The invention relates to the technical field of steel slag treatment, and in particular to a molten steel slag waste heat recovery device. Background Art

[0002] As we all know, steel slag is a variety of solid wastes produced during the steelmaking process, generally including converter slag, electric furnace slag and refined steel slag. The slag tapping temperature is often between 1200℃ and 1400℃, and its specific heat capacity is about 1.25. k J / (kg·℃). For example, if the waste heat of one ton of steel slag is reduced from 1400℃ to 400℃, 1.2×109J of heat can be obtained, which is a very high-quality waste heat resource.

[0003] At present, the traditional cooling processes for high-temperature molten steel slag are mainly hot stuffing, drum method, wind quenching, hot pouring, etc. The hot pouring method has been eliminated due to the serious environmental pollution. The remaining processes are to cool the steel slag by pumping water, ventilation, etc. These processes not only waste water resources, but also have problems such as high energy consumption and high pollution. Taking the hot stuffing method as an example, the high-temperature steel slag is poured into a slag pool or slag tank and cooled by pumping water. After the liquid water contacts the high-temperature steel slag, it quickly vaporizes and takes away the heat, thereby realizing the rapid cooling and solidification of the steel slag. However, in this process, a large amount of dust-containing water vapor will be generated, which not only wastes a lot of water resources, but also brings huge atmospheric pollutants. It is an unorganized emission behavior, and the waste heat resources contained in the high-temperature molten steel slag are completely wasted.

[0004] In view of this, the two-step process of roller crushing combined with hot stuffing gradually replaces the traditional process. The principle is to pour the high-temperature molten slag into the roller crushing bed, and then the material is continuously disturbed by the relative movement between the roller crushing roller and the crushing bed and the rotation of the crushing roller itself. In this process, water is pumped to achieve the initial cooling and granulation of the slag. This process can usually cool the high-temperature molten slag to 600-500℃, and then the high-temperature slag that has been initially cooled and granulated is discharged to the transfer slag tank and sent to the hot stuffing pool or hot stuffing tank in the second step, where water is pumped for cooling. Compared with the traditional process, the water consumption of this process is reduced. The roller crushing device is placed in a closed cover and a wet dust removal system is set up to ensure that the pollutants are discharged in compliance with the standards. The hot stuffing pool or hot stuffing tank is then equipped with a sealed cover to collect the steam generated by water pumping and hot stuffing for waste heat recovery. However, there is still the problem that the heat of the high-temperature section of the slag cannot be recovered, and there are still problems such as large equipment, high operating costs, high energy consumption, and waste of water resources. Summary of the invention

[0005] In view of the problems disclosed in the background technology, the present invention provides a molten steel slag waste heat recovery device.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A molten steel slag waste heat recovery device, comprising a recovery chamber, characterized in that the recovery chamber is composed of a heat extraction cover shell at the top, a shell wall frame in the middle and a heat exchange cooling bed at the bottom, forming a closed heat exchange space;

[0008] Among them, the heat extraction cover shell closes the top of the shell wall frame and can be opened and closed. A membrane wall heat exchanger is arranged inside it. The membrane wall heat exchanger is suspended above the shell wall frame. The heat exchange cooling bed is composed of a plurality of heat exchange bed plates combined, closes the bottom of the shell wall frame and can be opened and closed. The heat exchange coils are wound inside the heat exchange bed plates. The slag squeezing heads are symmetrically arranged in the shell wall frame, and the slag squeezing heads approach or move away from each other to perform a squeezing movement.

[0009] The above-mentioned molten steel slag waste heat recovery device is characterized in that a plurality of guiding heat exchange tubes consistent with the movement direction of the slag squeezing heads are arranged at the lower end of the heat extraction cover shell. The lower end surface of the guiding heat exchange tubes is fitted and close to the upper end surface of the heat exchange cooling bed. A guiding groove matching the cross section of the guiding heat exchange tubes is opened on the lower end surface of the slag squeezing head.

[0010] The above-mentioned molten steel slag waste heat recovery device is characterized in that the upper end surface of the heat exchange bed plate is in a toothed groove shape to increase the surface area of its upper end surface. The toothed groove structures on adjacent heat exchange bed plates are continuous and smoothly transition. The lower end of the slag squeezing head is also toothed and matches the toothed groove structure on the upper end surface of the heat exchange bed plate.

[0011] The above-mentioned molten steel slag waste heat recovery device is characterized in that tracks are arranged on both sides of the recovery chamber, and a gantry spanning the recovery chamber is arranged through the tracks. A slag package that can be rotated and tilted is arranged on the gantry.

[0012] The above-mentioned molten steel slag waste heat recovery device is characterized in that the heat extraction cover shell is configured with an opening and closing mechanism to control the opening and closing of the heat extraction cover shell. The opening and closing mechanism includes a column, a cantilever and a cantilever driver. The column is fixedly arranged on one side of the recovery chamber. The cantilever driver is installed on the column. The cantilever is hinged to the top of the column. One end of the cantilever is hinged to the top of the heat extraction cover shell, and the other end is hinged to the driving end of the cantilever driver. The cantilever driver controls the rotation of the cantilever, and thus controls the opening and closing of the heat extraction cover shell.

[0013] The above-mentioned molten steel slag waste heat recovery device is characterized in that the inlet end and the return end of the membrane wall heat exchanger are led out from the cantilever and the column through pipelines and rotary joints, and interact with heat-using equipment and / or heat storage equipment.

[0014] The above-mentioned molten steel slag waste heat recovery device is characterized in that the heat extraction housing is composed of two symmetrically arranged and opening-and-closing heat extraction housing units. A membrane wall heat exchanger is provided in each heat extraction housing unit. One side of the membrane wall heat exchanger is hinged to the upper end face of the housing wall frame. The heat extraction housing units are controlled to open and close by a heat extraction housing driver, and the heat extraction housing driver is installed at the hinged position between the heat extraction housing unit and the housing wall frame.

[0015] The above-mentioned molten steel slag waste heat recovery device is characterized in that the inlet end and the return end of the membrane wall heat exchanger are led out from the side of the recovery chamber through pipelines and rotary joints, cross the track and the gantry underground, and then interact with the heat-using equipment and / or the heat storage equipment.

[0016] The above-mentioned molten steel slag waste heat recovery device is characterized in that the slag extrusion head is controlled to move by a slag extrusion driver. The slag extrusion driver is installed on the housing wall frame, and its driving end extends into the housing wall frame and is connected to the slag extrusion head, controlling the slag extrusion head to move linearly under the guiding action of the guiding heat exchange tube.

[0017] Support columns are arranged at the bottom of the recovery chamber, and its horizontal height is lifted by the support columns, leaving a discharging space below the recovery chamber. A cooling bed driver is arranged on the support columns. One side of the heat exchange bed plate is hinged to the lower end of the housing wall frame. One end of the cooling bed driver is hinged to the support column, and the other end is hinged to the heat exchange bed plate, controlling the opening and closing of the heat exchange cooling bed.

[0018] The above-mentioned molten steel slag waste heat recovery device is characterized in that the inlet end and the return end of the heat exchange coil and the guiding heat exchange tube are led out from the side of the recovery chamber through pipelines and rotary joints, cross the track and the gantry underground, and then interact with the heat-using equipment and / or the heat storage equipment.

[0019] The technical effects and advantages of the present invention:

[0020] The present invention discloses a molten steel slag waste heat recovery device, which relates to the technical field of steel slag treatment, and is particularly suitable for the waste heat recovery treatment and coarse crushing treatment of molten steel slag. It includes a recovery chamber, which is composed of a heat extraction housing, a housing wall frame and a heat exchange cooling bed. A membrane wall heat exchanger is arranged in the heat extraction housing. The heat exchange cooling bed is composed of a plurality of heat exchange bed plates combined. A slag extrusion head is arranged in the housing wall frame. The present invention has reasonable design and simple principle. It adopts a heat exchange method combining wall heat exchange and thermal radiation heat exchange, can effectively and quickly complete the waste heat recovery and coarse crushing of molten steel slag, without water resource waste throughout the process, can adopt dry dust removal, without water treatment equipment such as sedimentation ponds, with few energy-consuming equipment, the steel slag is not easy to stick to the equipment, the equipment wear is small, the waste heat recovery is carried out in a closed space, the high-temperature situation in the working area is significantly improved, which is more convenient for the long-term operation and maintenance of the equipment. At the same time, the equipment can be continuously laid in parallel, and the working efficiency is significantly improved, which is suitable for large-scale promotion. Brief Description of the Drawings

[0021] Figure 1 This is the front elevation sectional view of the present invention (discharging state).

[0022] Figure 2 This is the front elevation sectional view of the present invention (feeding state).

[0023] Figure 3 This is the top plan view of the cross-section of the heat exchange cooling bed.

[0024] Figure 4 This is the front elevation sectional view of the present invention (Example 6).

[0025] Figure 5 This is the simple side elevation sectional view of the present invention.

[0026] Figure 6 This is the sectional view of the heat exchange bed plate (Example 3).

[0027] Figure 7 This is the front elevation sectional view of the present invention (Examples 10 and 11).

[0028] Among them, the reference numerals are as follows: 1, recovery chamber; 2, heat extraction housing; 3, housing wall frame; 4, heat exchange cooling bed; 5, membrane wall heat exchanger; 6, heat exchange bed plate; 7, heat exchange coil; 8, slag squeezing head; 9, guiding heat exchange tube; 10, guiding groove; 11, track; 12, gantry; 13, slag pocket; 14, opening and closing mechanism; 15, column; 16, cantilever; 17, cantilever driver; 18, heat extraction housing unit; 19, heat extraction housing driver; 20, slag squeezing driver; 21, support column; 22, cooling bed driver; 23, rotary joint; 24, slag baffle; 25, air inlet; 26, circulation fan. Detailed Description of the Invention

[0029] 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 the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] Example 1

[0031] As shown in the figure, this embodiment discloses a molten steel slag waste heat recovery device for waste heat recovery and preliminary granulation treatment of steel slag, especially applicable to molten steel slag. Specifically, the waste heat recovery device includes a recovery chamber 1. Among them, the recovery chamber 1 is composed of a heat extraction housing 2 at the top, a housing wall frame 3 in the middle, and a heat exchange cooling bed 4 at the bottom, forming a closed heat exchange space and also used as a granulation treatment space;

[0032] In this embodiment, a heat extraction cover 2 is used to seal the top of the housing wall frame 3 and can be opened and closed, facilitating the feeding of molten steel slag. To achieve the effect of waste heat recovery, a membrane wall heat exchanger 5 is arranged inside the heat extraction cover 2. The membrane wall heat exchanger 5 is suspended above the housing wall frame 3 to achieve the effect of radiative heat transfer. In addition, the heat exchange cooling bed 4 of this embodiment is composed of a plurality of heat exchange bed plates 6, which seals the bottom of the housing wall frame 3 and can be opened and closed for carrying materials and discharging. Heat exchange coils 7 are wound inside the heat exchange bed plates 6 to achieve the effect of wall-to-wall heat transfer. At the same time, slag squeezing heads 8 are symmetrically arranged inside the housing wall frame 3 of this embodiment, and the slag squeezing heads 8 move relatively closer or farther away to perform a squeezing motion;

[0033] After the molten steel slag enters the recovery chamber 1 (at this time, the heat exchange cooling bed 4 is closed and the slag squeezing heads 8 are in a relatively far-away state), the heat extraction cover 2 is closed accordingly. The heat exchange coils 7 and the heat extraction cover 2 start to work for wall-to-wall heat transfer and radiative heat transfer. The molten steel slag then begins to cool and gradually solidify, forming a cooling shell on its outer layer, especially at its bottom and top. The bottom of the molten steel slag shrinks due to cooling and solidification, and then detaches from the upper end surface of the heat exchange bed plate 6 (to prevent adhesion), but this also reduces the wall-to-wall heat transfer effect of the heat exchange bed plate 6. The cooling shell on the top of the molten steel slag will affect the radiative heat transfer effect of the membrane wall heat exchanger 5. Based on this, the slag squeezing heads 8 start to work and perform a squeezing motion. During this process, the cooling shell on the outer layer of the molten steel slag breaks, and the wall-to-wall heat transfer effect of the heat exchange bed plate 6 and the radiative heat transfer effect of the membrane wall heat exchanger 5 can be stably and continuously carried out. As the squeezing motion of the slag squeezing heads 8 is repeated multiple times, the molten steel slag is quickly cooled and solidified, and at the same time, it is coarsely crushed by extrusion; with the completion of the coarse crushing (preliminary granulation treatment), the remaining heat inside the steel slag gradually loses its recovery value. At this time, the slag squeezing heads 8 reset (return to a relatively far-away state), the heat exchange cooling bed 4 is opened, and the coarsely crushed steel slag falls due to gravity to complete the discharging. After the discharging is completed, the heat exchange cooling bed 4 resets and closes, and the heat extraction cover 2 is opened, waiting for the next feeding of molten steel slag to repeat the waste heat recovery and preliminary granulation treatment of the steel slag.

[0034] Embodiment 2

[0035] Based on the technical solution disclosed in Embodiment 1, in a molten steel slag waste heat recovery device of this embodiment, a plurality of guiding heat exchange tubes 9 in the same movement direction as the slag squeezing heads 8 are arranged at the lower end of the heat extraction cover 2. The guiding heat exchange tubes 9 have the effect of wall-to-wall heat transfer, and their upper surfaces can be designed as arc-shaped to increase the heat exchange area and enhance the wall-to-wall heat transfer effect. At the same time, the lower end surface of the guiding heat exchange tubes 9 fits and is close to the upper end surface of the heat exchange cooling bed 4 in the closed state. A guiding groove 10 that fits the cross-section of the guiding heat exchange tubes 9 is opened on the lower end surface of the slag squeezing heads 8 to provide a guiding function for the movement of the slag squeezing heads 8 and ensure the stable operation of the squeezing motion of the slag squeezing heads 8.

[0036] Embodiment 3

[0037] To enhance the heat exchange effect of the partition heat exchanger of the cooling bed 4, in a molten steel slag waste heat recovery device of this embodiment, the upper end surface of the heat exchange bed plate 6 is designed into a toothed groove structure to increase the surface area of its upper end surface. The toothed groove structures on adjacent heat exchange bed plates 6 are continuous and smoothly transition. Correspondingly, the lower end of the slag squeezing head 8 is also designed to be toothed and fits with the toothed groove structure presented on the upper end surface of the heat exchange bed plate 6. While enhancing the partition heat exchange effect, it also has a better guiding effect on the slag squeezing head 8. At this time, it is also more conducive to conducting the heat accumulated on the slag squeezing head 8 towards the heat exchange bed plate 6, providing guarantee for the long-term and stable operation of the molten steel slag waste heat recovery device;

[0038] In addition, to ensure the extrusion and crushing effects, in this embodiment, extrusion teeth are arranged in a stepped manner up and down on the extrusion surface of the slag squeezing head 8. Since it is an extrusion crushing method, compared with the existing crushing roller crushing method, the equipment wear condition is greatly reduced; at the same time, to prevent the steel slag from falling on the upper end surface of the slag squeezing head 8, in this embodiment, a corresponding slag baffle 24 is fixedly arranged in the shell wall frame 3 above the slag squeezing head 8. The front edge of the slag baffle 24 is close to the upper end surface of the slag squeezing head 8. As the slag squeezing head 8 reciprocates, the slag baffle 24 can effectively push the steel slag falling on the slag squeezing head 8 away from the upper end surface of the slag squeezing head 8.

[0039] Embodiment 4

[0040] To achieve more convenient feeding, in a molten steel slag waste heat recovery device of this embodiment, tracks 11 are arranged on both sides of the recovery chamber 1, and a gantry 12 spanning the recovery chamber 1 is arranged through the tracks 11. The gantry 12 can move through the tracks 11, and a slag bag 13 that can be rotated and tilted is arranged on it, which can effectively control the tilting angle (tilting amount) and tilting position of the molten steel slag, helps to ensure equal-quality slag pouring, and helps the poured molten steel slag to form a uniformly thick layer at the bottom of the recovery chamber 1, which helps to enhance the heat exchange and cooling effect of the molten steel slag waste heat recovery device.

[0041] Embodiment 5

[0042] For the convenience of the inlet and return flow of the membrane wall heat exchanger 5 and to avoid interference with the gantry 12, in a molten steel slag waste heat recovery device of this embodiment, a opening and closing mechanism 14 is configured on the heat extraction housing 2 to control the opening and closing of the heat extraction housing 2. The opening and closing mechanism 14 includes a column 15, a cantilever 16, and a cantilever driver 17. The column 15 is fixedly arranged on one side of the recovery chamber 1, avoiding the track 11 on one side. The cantilever driver 17 is installed on the column 15. The cantilever 16 is hinged to the top of the column 15. One end of the cantilever 16 is hinged to the top of the heat extraction housing 2, and the other end is hinged to the driving end of the cantilever driver 17. When the cantilever driver 17 operates, the lever principle is used to control the rotation of the cantilever 16, and then control the movement of the heat extraction housing 2 to perform the opening and closing action. After the cantilever 16 rotates to a certain angle, it will not affect the movement of the gantry 12 on the track 11, thus avoiding the influence on the feeding of molten steel slag;

[0043] In addition, also to avoid interference with the gantry 12, the inlet end and the return end of the membrane wall heat exchanger 5 are led out from the cantilever 16 and the column 15 through pipelines and rotary joints 23, and after being led out, they interact with the heat-using equipment and / or heat storage equipment to realize the utilization and / or storage of waste heat.

[0044] Embodiment 6

[0045] To more conveniently realize the opening and closing of the heat extraction housing 2 and the pipeline design of the membrane wall heat exchanger 5, a molten steel slag waste heat recovery device of this embodiment discloses the following technical solutions. Specifically, the heat extraction housing 2 of this embodiment is composed of two symmetric and opening-and-closing heat extraction housing units 18, one side of which is hinged to the upper end surface of the housing wall frame 3, and is configured with a heat extraction housing driver 19 to control the opening and closing. The heat extraction housing driver 19 is installed at the hinged position between the heat extraction housing unit 18 and the housing wall frame 3. At the same time, to realize the heat exchange function, independent membrane wall heat exchangers 5 are provided in each of the heat extraction housing units 18. When the heat extraction housing 2 opens and closes, the membrane wall heat exchanger 5 moves along with it. The inlet end and the return end of the membrane wall heat exchanger 5 are led out from the side of the recovery chamber 1 through pipelines and rotary joints 23, cross the track 11 and the gantry 12 underground, and then interact with the heat-using equipment and / or heat storage equipment.

[0046] Embodiment 7

[0047] Based on the technical solutions of the above embodiments, in a molten steel slag waste heat recovery device of this embodiment, the slag squeezing head 8 is controlled to move by a slag squeezing driver 20. The slag squeezing driver 20 is installed on the housing wall frame 3, and its driving end extends into the housing wall frame 3 and is connected to the slag squeezing head 8 to control the slag squeezing head 8 to perform a linear motion under the guiding action of the guiding heat exchange tube 9. Combining with the technical solutions disclosed in Embodiment 3, it will have a better guiding effect;

[0048] In addition, support columns 21 are provided at the bottom of the recovery chamber 1, and its horizontal height is lifted by the support columns 21, leaving a discharging space below the recovery chamber 1. Of course, it can also be achieved by excavating the foundation. During discharging, dust suction devices are correspondingly arranged around the bottom of the recovery chamber 1 for dry dust removal. In this embodiment, a cooling bed driver 22 is provided on the support column 21. One side of the heat exchange bed plate 6 is hinged to the lower end of the housing wall frame 3. One end of the cooling bed driver 22 is hinged to the support column 21, and the other end is hinged to the heat exchange bed plate 6 to control the opening and closing of the heat exchange cooling bed 4.

[0049] Embodiment 8

[0050] Based on the technical solutions of the above embodiments, for a molten steel slag waste heat recovery device in this embodiment, the inlet and return ends of the heat exchange coil 7 and the guiding heat exchange tube 9 are led out from the side of the recovery chamber 1 through pipelines and rotary joints 23, cross the track 11 and the gantry 12 underground, and then interact with the heat-using equipment and / or heat storage equipment. Combining the technical solutions disclosed in Embodiment 6, the inlet and return ends of the heat exchange coil 7 and the guiding heat exchange tube 9 can be led out together after the return of the inlet and return ends of the membrane wall heat exchanger 5, provided that the same refrigerant medium is used therein.

[0051] Meanwhile, pumps are provided on the pipelines connected to the relevant inlet and return ends to promote the flow of the refrigerant medium in the pipelines for forced flow and improve the heat exchange efficiency.

[0052] Embodiment 9

[0053] Based on the heat extraction hood driver 19, the slag squeezing driver 20 and the cooling bed driver 22 mentioned in the above embodiments, they can be one or more of pneumatic, hydraulic and electric drive devices, such as cylinders, oil cylinders, etc.

[0054] Embodiment 10

[0055] Based on a molten steel slag waste heat recovery device disclosed in the above embodiments, it is not difficult to find that when the recovery chamber 1 is in a closed state, the air in the recovery chamber 1 is disturbed due to natural convection. To further improve the heat exchange rate and effect, in this embodiment, air inlets 25 and air outlets are provided on the front and rear sides of the housing wall frame 3 and are connected through an external air duct. The air duct is fixed to the outer wall of the housing wall frame 3, and a circulating fan 26 is provided thereon. When the circulating fan 26 is started, it can effectively drive the gas flow in the recovery chamber 1, and then accelerate the relative movement between the hot air in the recovery chamber 1 and the heated surface of the membrane wall heat exchanger 5 and the upper surface of the steel slag, realizing forced convection heat exchange with air as the medium and the membrane wall heat exchanger 5 as the heat-receiving party, enhancing the heat exchange effect and utilization effect of the membrane wall heat exchanger 5, and indirectly improving the overall heat exchange effect of the waste heat recovery device.

[0056] In addition, at one end of the air duct near the air outlet, a heat-resistant dust collector (such as a cyclone dust collector) should be installed to filter dust, avoid dust pollution from affecting the normal operation of the equipment and extend its service life. This dust collector is detachable for easy regular cleaning and maintenance.

[0057] Embodiment 11

[0058] Based on the above embodiment solutions, in this embodiment, a molten steel slag waste heat recovery device, wherein the heat storage device can be a heat accumulator or a molten salt heat storage device, which can effectively balance the problem of uneven waste heat recovery amount and achieve the effect of continuous and stable heat supply. At the same time, by interacting with the generator set, the technical effect of waste heat power generation can be achieved, which can quickly respond to load changes, assist the generator set in smoothly adjusting the output, reduce the frequent start and stop of the generator set. Moreover, there is also heat exchange between the heat storage device and the generator set, which can recover the heat generated during the operation of the generator set, thereby improving the thermal energy utilization efficiency.

[0059] Embodiment 12

[0060] Based on the above embodiment content, in this embodiment, the recovery chamber 1 of the molten steel slag waste heat recovery device can be continuously distributed along the track 11. The slag ladle 13 moves through the gantry 12 and the track 11 and successively supplies materials to the continuous recovery chamber 1 to achieve the purpose of continuous treatment of molten steel slag. In addition, below the recovery chamber 1 lifted by the support column 21, a conveying device can be set to collect the solidified steel slag that has completed waste heat recovery and coarse crushing and send it to the backend for more refined granulation treatment or other treatments.

[0061] In the description of the present invention, unless otherwise clearly specified and defined, the terms "set", "install", "connected", "connected", "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0062] The standard parts used in the present invention can all be purchased from the market, and the special-shaped parts can be customized according to the description of the specification and the drawings.

[0063] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A molten steel slag waste heat recovery device, comprising a recovery chamber (1), characterized in that, The recovery chamber (1) is composed of a heat extraction housing (2) at the top, a housing wall frame (3) in the middle, and a heat exchange cooling bed (4) at the bottom, forming a closed heat exchange space; Among them, the heat extraction housing (2) closes the top of the housing wall frame (3) and can be opened and closed. A membrane wall heat exchanger (5) is arranged inside it. The membrane wall heat exchanger (5) is suspended above the housing wall frame (3). The heat exchange cooling bed (4) is composed of a plurality of heat exchange bed plates (6) combined together, closes the bottom of the housing wall frame (3) and can be opened and closed. Heat exchange coils (7) are wound inside the heat exchange bed plates (6).

2. The waste heat recovery device for molten steel slag according to claim 1, wherein, Slag squeezing heads (8) are symmetrically arranged inside the housing wall frame (3), and the slag squeezing heads (8) move relatively closer or farther away to perform a squeezing motion.

3. The waste heat recovery device for molten steel slag according to claim 2, wherein, A plurality of guiding heat exchange tubes (9) consistent with the moving direction of the slag squeezing heads (8) are arranged at the lower end of the heat extraction housing (2). The lower end surfaces of the guiding heat exchange tubes (9) are fitted and close to the upper end surface of the heat exchange cooling bed (4). A guiding groove (10) fitted with the cross-section of the guiding heat exchange tubes (9) is opened on the lower end surface of the slag squeezing heads (8).

4. The waste heat recovery device for molten steel slag according to claim 3, characterized in that, The upper end surface of the heat exchange bed plates (6) is in a toothed groove shape to increase the surface area of its upper end surface. The toothed groove structures on adjacent heat exchange bed plates (6) are continuous with each other and smoothly transition. The lower end of the slag squeezing heads (8) is also toothed and is fitted with the toothed groove structure on the upper end surface of the heat exchange bed plates (6).

5. The waste heat recovery device for molten steel slag according to claim 4, characterized in that, Tracks (11) are arranged on both sides of the recovery chamber (1), and a gantry (12) spanning the recovery chamber (1) is arranged through the tracks (11). A slag bag (13) that can be rotated and dumped is arranged on the gantry (12).

6. The waste heat recovery device for molten steel slag according to claim 5, characterized in that, The heat extraction housing (2) is configured with an opening and closing mechanism (14) to control the opening and closing of the heat extraction housing (2). The opening and closing mechanism (14) includes a column (15), a cantilever (16), and a cantilever driver (17). The column (15) is fixedly arranged on one side of the recovery chamber (1). The cantilever driver (17) is installed on the column (15). The cantilever (16) is hinged to the top of the column (15). One end of the cantilever (16) is hinged to the top of the heat extraction housing (2), and the other end is hinged to the driving end of the cantilever driver (17). The cantilever driver (17) controls the rotation of the cantilever (16), and further controls the opening and closing of the heat extraction housing (2).

7. The waste heat recovery device for molten steel slag according to claim 6, characterized in that, The inlet end and the return end of the membrane wall heat exchanger (5) are led out from the cantilever (16) and the column (15) through pipelines and rotary joints, and interact with heat-using equipment and / or heat storage equipment.

8. The waste heat recovery device for molten steel slag according to claim 5, characterized in that, The heat extraction housing (2) is composed of two symmetrically arranged and oppositely opening heat extraction housing units (18). Membrane wall heat exchangers (5) are arranged inside both heat extraction housing units (18). One side of each is hinged to the upper end surface of the housing wall frame (3). The heat extraction housing units (18) are controlled to open and close by heat extraction housing drivers (19). The heat extraction housing drivers (19) are installed at the hinge positions between the heat extraction housing units (18) and the housing wall frame (3).

9. A molten steel slag waste heat recovery device according to any one of claims 4, 5, 6, 7 and 8, characterized in that, The slag squeezing head (8) is controlled to move by a slag squeezing driver (20). The slag squeezing driver (20) is installed on the housing wall frame (3). Its driving end extends into the housing wall frame (3) and is connected to the slag squeezing head (8), controlling the slag squeezing head (8) to perform a linear motion under the guiding action of the guiding heat exchange tube (9). Support columns (21) are arranged at the bottom of the recovery chamber (1), and its horizontal height is lifted by the support columns (21) so that there is a discharging space below the recovery chamber (1). A cooling bed driver (22) is arranged on the support columns (21). One side of the heat exchange bed plate (6) is hinged to the lower end of the housing wall frame (3). One end of the cooling bed driver (22) is hinged to the support columns (21), and the other end is hinged to the heat exchange bed plate (6), controlling the opening and closing of the heat exchange cooling bed (4).

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