Dry granulation device for molten steel slag

Abstract

The utility model provides a dry granulation device for molten steel slag, which comprises an enclosed hood, a plurality of granulating devices and a plurality of granulating devices, wherein the enclosed hood forms a hollow enclosed space; the granulating bed is arranged in the closed cover and is provided with a bearing surface for bearing the steel slag; the granulating machine assembly comprises a granulating machine arranged in the closed cover and a first driving motor arranged outside the closed cover, the granulating machine is arranged above the bearing surface of the granulating bed, and the granulating machine is driven by the first driving motor to extrude the steel slag on the bearing surface, so that the steel slag on the bearing surface is extruded by the granulating machine; the closed cover is used for containing the steel slag, so that the steel slag is granulated, and dust generated by granulation is limited in the closed cover; and the waste heat recovery device is arranged outside the closed cover and is communicated with the interior of the closed cover through a waste heat recovery pipeline so as to collect high-temperature flue gas generated by granulation.

Description

Technical Field

[0001] The utility model relates to a dry granulation device for molten steel slag. Background Art

[0002] The traditional molten slag granulation operation is carried out in an open-air environment, which is seriously polluting. With the improvement of environmental protection requirements, the granulation operation has gradually shifted to a semi-closed or closed system.

[0003] Although the granulation operation in a semi-closed or closed system has been achieved, the existing granulation process uses a wet (water cooling) cooling method, and there are still the following problems:

[0004] A large amount of dusty steam is produced during the granulation process of steel slag, which requires further dust removal and purification before it can be discharged in compliance with emission standards. The heat energy contained in the molten steel slag is wasted.

[0005] Therefore, it becomes an urgent problem to research and develop dry (air cooling) cooling technology and equipment for molten steel slag and realize efficient recovery and utilization of heat energy in molten steel slag. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a dry granulation device for molten steel slag, which adopts a dry granulation method and limits the dust generated during the granulation operation to the space within a closed cover, thereby avoiding pollution to the external environment and realizing the reuse of the waste heat of the high-temperature steel slag.

[0007] In one embodiment of the utility model, a dry granulation device for molten steel slag is provided, comprising:

[0008] A closed cover, wherein the closed cover forms a hollow closed space;

[0009] a granulation bed, the granulation bed being installed in the closed enclosure and having a bearing surface for bearing steel slag;

[0010] a granulator assembly, the granulator assembly comprising a granulator installed in the closed cover, and a first drive motor installed outside the closed cover, the granulator is arranged above the bearing surface of the granulation bed, the granulator is driven by the first drive motor to squeeze the steel slag on the bearing surface to granulate the steel slag, and dust generated by the granulation is confined within the closed cover; and

[0011] A waste heat recovery device is installed outside the closed cover and is connected to the inside of the closed cover via a waste heat recovery pipeline to collect high-temperature flue gas generated by the granulation.

[0012] In one embodiment, an air supply assembly is included, the air supply assembly comprising:

[0013] An air supply unit, the air supply unit is installed outside the closed cover and is used to provide cooling airflow;

[0014] An air supply unit, the air supply unit is installed in the closed cover and arranged above the bearing surface of the granulation bed;

[0015] Wherein, the air supply unit is connected to the air supply unit via an air supply channel penetrating the closed cover, so as to provide a cooling airflow to the steel slag on the bearing surface via the air supply unit.

[0016] In one embodiment, the granulation bed is reciprocatable in the closed enclosure along a first horizontal direction, and the first horizontal direction is the length direction of the supporting surface.

[0017] In one embodiment, the granulated bed comprises:

[0018] A bed body, the bed body comprising the bearing surface and a peripheral wall surrounding the periphery of the bearing surface from above the bearing surface, the peripheral wall and the bearing surface enclose a space for bearing the steel slag;

[0019] A guide rail assembly, the guide rail assembly comprising a supporting wheel disposed inside the bottom surface of the enclosed cover and a guide rail disposed on the bottom surface of the bed, the guide rail and the supporting wheel rollingly cooperate, the guide rail extending along the first horizontal direction, and a plurality of supporting wheels arranged at intervals along the first horizontal direction; and

[0020] A second driving motor is installed outside the enclosed cover, and drives the bed body to reciprocate along the first horizontal direction with the guide rail assembly as support.

[0021] In one embodiment, the granulator comprises a plurality of granulating teeth rotating around a central axis extending along a second horizontal direction perpendicular to the first horizontal direction, and ends of the granulating teeth contact the slag on the bearing surface.

[0022] In one embodiment, the rotation direction of the granulating teeth contacting the steel slag is the same as the moving direction of the bed, and the linear speed of the granulating teeth contacting the steel slag is greater than the moving speed of the bed.

[0023] In one embodiment, the load-bearing surface comprises:

[0024] A blanking opening is provided at one end of the bearing surface, and a blanking plate can be opened and closed to close the blanking opening.

[0025] In one embodiment, the rotation direction of the granulating teeth contacting the slag is opposite to the movement direction of the bed, so that the slag on the bearing surface moves to the drop port.

[0026] In one embodiment, it includes:

[0027] A slag pot, wherein the slag pot is loaded with the steel slag;

[0028] A tilting machine, the tilting machine is installed in the closed cover, and the tilting machine is used to overturn the slag pot so that the steel slag in the slag pot is dumped onto the bearing surface; and

[0029] A third driving motor is arranged outside the closed cover to drive the tilting machine to overturn the slag pot.

[0030] In one embodiment, the tilting machine rotates about a second horizontal direction perpendicular to the first horizontal direction to flip the slag pot in a longitudinal plane.

[0031] It can be seen from the above technical scheme that the steel slag granulation device in this embodiment adopts a molten steel slag dry granulation method, which uses a closed cover 1 to enclose the granulation device in a closed space, thereby limiting the dust generated when performing the granulation operation to the space within the closed cover, avoiding pollution to the external environment. Furthermore, the first drive motor for providing driving force is arranged outside the closed cover 1, thereby avoiding the pollution of the drive motor caused by dust, thereby effectively extending the service life of the drive device, extending the service life of the granulation equipment as a whole and reducing pollution to the external environment. In addition, the closed cover 1 collects the high-temperature flue gas generated by granulation, and then transports it all to the waste heat recovery device through the waste heat recovery pipeline, so that the waste heat generated during the steel slag granulation process can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The following drawings are only used to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0033] Figure 1 It is a structural schematic diagram of a dry granulation device for molten steel slag of the utility model. DETAILED DESCRIPTION

[0034] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation of the utility model is now described with reference to the accompanying drawings, in which the same reference numerals represent the same parts.

[0035] In this document, “exemplary” means “serving as an example, instance or illustration”, and any diagram or implementation described in this document as “exemplary” should not be interpreted as a more preferred or more advantageous technical solution.

[0036] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked.

[0037] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0038] In this article, "first", "second", etc. are only used to distinguish each other, and do not indicate the importance and order, or the premise of each other's existence.

[0039] In this article, "equal", "same" and the like are not strictly limited in the mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use. Unless otherwise specified, the numerical ranges herein include not only the entire range within its two endpoints, but also several sub-ranges contained therein.

[0040] Example embodiments will now be described more fully with reference to the accompanying drawings.

[0041] In order to solve the problems in the prior art, the utility model provides a dry granulation device for molten steel slag, which adopts a dry granulation method and limits the dust generated during the granulation operation to the space within a closed cover, thereby avoiding pollution to the external environment and realizing the reuse of the waste heat of the steel slag.

[0042] like Figure 1 As shown, one embodiment of the utility model provides a dry granulation device for molten steel slag, comprising:

[0043] A closed cover 1, wherein the closed cover 1 forms a hollow closed space;

[0044] A granulation bed 3, which is installed in the closed cover 1 and has a bearing surface for bearing steel slag;

[0045] a granulator assembly, the granulator assembly comprising a granulator 41 installed in the closed cover 1, and a first drive motor installed outside the closed cover 1, the granulator 41 is arranged above the bearing surface of the granulation bed 3, and the granulator 41 is driven by the first drive motor to squeeze the steel slag on the bearing surface to granulate the steel slag, and the dust generated by the granulation is confined within the closed cover 1; and

[0046] A waste heat recovery device (not shown) is installed outside the closed cover 1 and is connected to the inside of the closed cover 1 via a waste heat recovery pipeline to collect high-temperature flue gas generated by granulation.

[0047] The steel slag granulation device in this embodiment adopts a molten steel slag dry granulation method, which uses a closed cover 1 to enclose the granulation device in a closed space, thereby limiting the dust generated when performing the granulation operation to the space within the closed cover, avoiding pollution to the external environment. Furthermore, the first drive motor for providing driving force is arranged outside the closed cover 1, thereby avoiding the pollution of the drive motor caused by dust, thereby effectively extending the service life of the drive device, extending the service life of the granulation equipment as a whole and reducing pollution to the external environment. In addition, the closed cover 1 collects the high-temperature flue gas generated by granulation, and then transports it all to the waste heat recovery device through the waste heat recovery pipeline, so that the waste heat generated during the steel slag granulation process can be reused.

[0048] In one embodiment, the slag granulation device further includes an air supply component, and the air supply component includes:

[0049] An air supply unit (not shown), which is installed outside the closed cover 1 and is used to provide cooling airflow;

[0050] The air supply unit 6 is installed in the closed cover 1 and is arranged above the bearing surface of the granulation bed 3;

[0051] The air supply unit is connected to the air supply unit 6 via an air supply channel 5 penetrating the closed cover 1 , so as to provide cooling airflow to the steel slag on the bearing surface via the air supply unit 6 .

[0052] The cooling airflow is used to reduce the temperature of the steel slag, and a large amount of high-temperature flue gas will be generated while reducing the temperature of the steel slag. The air supply unit transports gas to the closed cover 1 through the air supply channel 5, and the generated high-temperature flue gas is all transported to the waste heat recovery device through the waste heat recovery pipeline, thereby achieving air pressure balance in the closed cover 1.

[0053] Since the enclosed cover 1 only encloses the space occupied by the tilting machine 2, the granulating bed 3 and the granulator 4, and the external driving device is not included therein, the internal space of the enclosed cover 1 is relatively reduced. Therefore, the air supply effect of the air supply component in a smaller and closed space is significantly higher than the air supply effect in a larger space (such as the space containing the driving device), and the operation of the air supply component in a small space also significantly reduces the power consumption of the air supply component.

[0054] In this embodiment, the granulated bed 3 can reciprocate along the first horizontal direction L in the closed cover 1, and the first horizontal direction L is the length direction of the bearing surface.

[0055] Wherein, the granulated bed 3 comprises:

[0056] The bed body 31 includes a bearing surface 311 and a peripheral wall 312 surrounding the periphery of the bearing surface 311 from above the bearing surface 311, and the peripheral wall 312 and the bearing surface 311 enclose a space for bearing the slag;

[0057] A guide rail assembly, the guide rail assembly includes a support wheel 321 disposed inside the bottom surface of the closed cover 1 and a guide rail disposed on the bottom surface of the bed 31, the guide rail and the support wheel 321 are rollingly matched, the guide rail extends along the first horizontal direction L, and a plurality of support wheels 321 are arranged at intervals along the first horizontal direction L; and

[0058] The second driving motor (not shown) is installed outside the closed cover 1, and drives the bed body 31 to reciprocate along the first horizontal direction L supported by the guide rail assembly.

[0059] In this embodiment, the position of the granulator 4 is fixed in the length direction of the granulator bed 3, while the granulator bed 3 is reciprocatingly movable relative to the granulator 4, so that the granulator 4 can fully granulate all the steel slag carried on the carrying surface 311 of the granulator bed 3.

[0060] The reciprocating motion of the granulating bed 3 is achieved by the cooperation between the guide rail provided at the bottom of the granulating bed 3 and the supporting wheel installed on the bearing surface, wherein the bearing of the guide rail assembly can be designed with a sealing structure to prevent the entry of dust.

[0061] The granulator 4 includes a plurality of granulating teeth 42 rotating around a central axis 41 extending along a second horizontal direction perpendicular to the first horizontal direction L, and ends of the granulating teeth 42 contact the slag on the bearing surface.

[0062] Optionally, the position of the granulator 4 can be adjusted in the height direction so that the distance between the central axis 41 and the bearing surface 311 can be adjusted. For example, when the granulator 4 is granulating, the central axis 41 can be moved toward the bearing surface 311, and when pouring slag onto the bearing surface 311 or discharging slag, the central axis 41 can be moved in a direction away from the bearing surface 311.

[0063] Alternatively, the position of the granulator 4 may be fixed in the height direction.

[0064] When the rotation direction of the granulating teeth 42 contacting the slag is the same as the moving direction of the bed 31 and the linear speed of the granulating teeth 42 contacting the slag is greater than the moving speed of the bed 31 , the granulator 4 can be used to granulate the slag.

[0065] During the granulation process, the rotation speed of the granulator 4 and the reciprocating translation speed of the granulator bed 3 can be adjusted according to the different states of the steel slag to achieve a suitable rotation speed and speed. In an optional embodiment, the rotation speed of the granulator 4 ranges from 5 rpm to 30 rpm, preferably 12 rpm, or the linear speed of the outer tooth end of the granulator 4 ranges from 56 m / min to 340 m / min, preferably 110 m / min. The translation speed of the granulator bed 3 ranges from 1 m / min to 5 m / min, preferably 2 m / min.

[0066] In one example, the load bearing surface 311 includes:

[0067] The blanking opening is opened at one end of the bearing surface 311 , and the blanking plate 313 can be opened and closed to close the blanking opening.

[0068] When pushing, the granulating bed 3 moves horizontally so that its edge moves to the top of the material drop port 7, and the granulating machine 4 rotates to push the slag on the granulating bed 3 into the material drop port, thereby completing the material pushing action. The granulating teeth 412 that contact the slag rotate in the opposite direction to the moving direction of the bed body 31, so that the slag on the bearing surface 311 moves to the material drop port.

[0069] like Figure 1 As shown, the steel slag granulation device of this example includes:

[0070] Slag tank 8, slag tank 8 is loaded with steel slag;

[0071] A tilting machine 2, which is installed in the closed cover 1 and is used to overturn the slag pot 8 so that the steel slag in the slag pot 8 can be dumped onto the bearing surface; and

[0072] The third driving motor is arranged outside the closed cover 1 to drive the tilting machine 2 to flip the slag pot 8.

[0073] The tilting machine 2 rotates around a second horizontal direction perpendicular to the first horizontal direction L to flip the slag pot 8 in a longitudinal plane.

[0074] In this embodiment, the first drive motor, the second drive motor and the third drive motor are located outside the closed cover 1. Furthermore, during the granulation operation, the dust generated in the closed cover 1 will not enter the first drive motor, the second drive motor and the third drive motor, so the first drive motor, the second drive motor and the third drive motor will not be affected by the dust, thereby ensuring long-term stable operation. Among them, the first drive motor, the second drive motor and the third drive motor include transmission components, thereby ensuring the cleanliness of the transmission components.

[0075] This embodiment further includes an air supply device, which is arranged outside the closed cover 1 and passes through Figure 1The air supply device channel 5 shown is connected to the closed cover 1 to perform air supply to the space inside the closed cover 1. Since the closed cover 1 only encloses the space occupied by the tilting machine 2, the granulating bed 3 and the granulator 4 therein, and the external driving motor is not included therein, the internal space of the closed cover 1 is relatively reduced, so the air supply device effect in a smaller and enclosed space is significantly higher than the air supply device effect in a larger space (for example, the space containing the driving motor), and the air supply device operation in a small space range also significantly reduces the power consumption of the air supply device.

[0076] This embodiment provides a method for granulating hot molten steel slag. The method adopts the molten steel slag dry granulation system and equipment as described in the above embodiments. The method for granulating hot molten steel slag in this embodiment includes:

[0077] Step 1: The slag pot enters the closed cover, the tipping machine receives the slag pot and rotates to dump the steel slag, and the empty slag pot is lifted out of the closed cover;

[0078] Step 2: The granulating bed receives the steel slag, and the granulating bed moves horizontally and linearly;

[0079] Step 3: The granulator and the granulator bed cooperate with each other to perform the granulation process of the steel slag;

[0080] Step 4: During the granulation process, the granulation degree of the steel slag is monitored. When the granulation degree of the steel slag reaches a preset condition, the granulator and the granulation bed move in coordination to push the material into the material outlet.

[0081] Wherein, in an optional embodiment, the granulation process:

[0082] The movement direction of the outer tooth end of the granulator toward the surface of the granulation bed is the same as the movement direction of the granulation bed, and the movement speed of the granulation bed is lower than the linear speed of the outer tooth end of the granulator.

[0083] In an optional embodiment, the pushing process:

[0084] The movement direction of the outer tooth end of the granulator is toward the surface of the granulation bed and is opposite to the movement direction of the granulation bed.

[0085] Specifically, the process mainly includes the following steps:

[0086] First, the slag pot enters the closed cover, and the tipping machine tipped the slag pot to dump the material;

[0087] The granulating bed receives the material and starts horizontal linear movement;

[0088] Afterwards, the granulation operation and the air supply device operation are started simultaneously to supply air for cooling, which can rapidly cool and solidify the hot molten slag. During the granulation operation, the dusty hot air is drawn out from the air supply device channel under the action of the air supply device.

[0089] During the granulation process, monitor the granulation degree of slag, including the particle size and temperature;

[0090] Determine whether the granulation degree of the slag meets the set discharging conditions. This step can be achieved by using a control device. For example, a control device with a display device is used to determine whether the discharging conditions are met by observing the particle size displayed by the display device and the temperature of the vehicle used. The control device can also automatically measure the particle size and temperature and compare them with the set particle size threshold and temperature threshold to determine whether the discharging conditions are met.

[0091] When the discharge conditions are met, the coordinated movement of the granulating bed and the granulator is controlled to push the material, and the granulated slag enters the discharge port for discharge.

[0092] In an optional embodiment, the granulator 4 completes the granulation process by changing the rotation direction to cooperate with the reciprocating translation of the granulator bed 3. When the granulator bed 3 translates in a certain direction, the rotation direction of the granulator 4 makes the movement direction of the steel slag consistent with the translation direction of the granulator bed 3, and at the same time, there is a certain speed difference between the linear velocity of the outer teeth of the granulator 4 and the translation of the granulator bed 3 (preferably, the speed difference is 0.05 m / min to 0.5 m / min), so that the speed of the granulator bed 3 is lower than the linear velocity of the outer teeth of the granulator 4, so that the steel slag can be evenly distributed on the granulator bed 3, and the steel slag can be prevented from gradually accumulating on the granulator bed 3.

[0093] After the granulation process is completed, the granulator 4 and the granulator bed 3 cooperate with each other to realize the pushing process. During the pushing process, when the granulator bed 3 moves in a certain direction, the rotation direction of the granulator 4 makes the movement direction of the slag opposite to the translation direction of the granulator bed 3. The granulator bed 3 feeds the granulator 4, and the granulator 4 pushes the slag in the opposite direction, so that the slag gradually accumulates at the end of the granulator bed 3, and finally pushes the slag into the drop port 7 to complete the pushing process.

[0094] The molten steel slag dry granulation system, equipment and method of the utility model embodiment utilizes a closed cover to isolate the tilting machine, the granulation bed and the granulator from the outside world, and places the driving device (including the transmission device) used to drive the granulation bed and the granulator to move outside the closed cover, so that the dust generated when the granulation operation is performed is only in the space within the closed cover, avoiding pollution to the external environment including the driving device, thereby effectively extending the service life of the driving device, extending the service life of the granulation equipment as a whole, reducing pollution to the external environment, and reducing the power consumption of the air supply device and the reuse of the waste heat of the steel slag. The utility model embodiment utilizes a control device to realize full automatic control of the granulation operation, and realizes automatic adjustment of the processing speed, processing time and discharge particle size according to the temperature and shape of the steel slag, forming a closed-loop automatic processing.

[0095] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the utility model, and are not intended to limit the scope of protection of the utility model. Any equivalent implementation plans or changes that do not deviate from the technical spirit of the utility model, such as combination, division or repetition of features, should be included in the scope of protection of the utility model.

Claims

1. A dry granulation device for molten steel slag, characterized in that: include: A closed cover, wherein the closed cover forms a hollow closed space; a granulation bed, the granulation bed being installed in the closed enclosure and having a bearing surface for bearing steel slag; a granulator assembly, the granulator assembly comprising a granulator installed in the closed cover, and a first drive motor installed outside the closed cover, the granulator is arranged above the bearing surface of the granulation bed, the granulator is driven by the first drive motor to squeeze the steel slag on the bearing surface to granulate the steel slag, and dust generated by the granulation is confined within the closed cover; and A waste heat recovery device is installed outside the closed cover and is connected to the inside of the closed cover via a waste heat recovery pipeline to collect high-temperature flue gas generated by the granulation.

2. The dry granulation device for molten steel slag according to claim 1, characterized in that: The invention comprises an air supply component, wherein the air supply component comprises: An air supply unit, the air supply unit is installed outside the closed cover and is used to provide cooling airflow; An air supply unit, the air supply unit is installed in the closed cover and arranged above the bearing surface of the granulation bed; Wherein, the air supply unit is connected to the air supply unit via an air supply channel penetrating the closed cover, so as to provide a cooling airflow to the steel slag on the bearing surface via the air supply unit.

3. The dry granulation device for molten steel slag according to claim 1, characterized in that: The granulated bed can reciprocate in the closed cover along a first horizontal direction, and the first horizontal direction is the length direction of the bearing surface.

4. The dry granulation device for molten steel slag according to claim 3, characterized in that: The granulated bed comprises: A bed body, the bed body comprising the bearing surface and a peripheral wall surrounding the periphery of the bearing surface from above the bearing surface, the peripheral wall and the bearing surface enclose a space for bearing the steel slag; A guide rail assembly, the guide rail assembly comprising a supporting wheel disposed inside the bottom surface of the enclosed cover and a guide rail disposed on the bottom surface of the bed, the guide rail and the supporting wheel rollingly cooperate, the guide rail extending along the first horizontal direction, and a plurality of supporting wheels arranged at intervals along the first horizontal direction; and A second driving motor is installed outside the enclosed cover, and drives the bed body to reciprocate along the first horizontal direction with the guide rail assembly as support.

5. The dry granulation device for molten steel slag according to claim 4, characterized in that: The granulator includes a plurality of granulating teeth rotating around a central axis extending along a second horizontal direction perpendicular to the first horizontal direction, and ends of the granulating teeth contact the slag on the bearing surface.

6. The dry granulation device for molten steel slag according to claim 5, characterized in that: The rotation direction of the granulating teeth contacting the steel slag is the same as the moving direction of the bed, and the linear speed of the granulating teeth contacting the steel slag is greater than the moving speed of the bed.

7. The dry granulation device for molten steel slag according to claim 5, characterized in that: The bearing surface comprises: A blanking opening is provided at one end of the bearing surface, and a blanking plate can be opened and closed to close the blanking opening.

8. The dry granulation device for molten steel slag according to claim 7, characterized in that: The granulating teeth contacting the slag rotate in a direction opposite to the moving direction of the bed, so that the slag on the bearing surface moves to the drop port.

9. The dry granulation device for molten steel slag according to claim 3, characterized in that: include: A slag pot, wherein the slag pot is loaded with the steel slag; A tilting machine, the tilting machine is installed in the closed cover, and the tilting machine is used to overturn the slag pot so that the steel slag in the slag pot is dumped onto the bearing surface; and A third driving motor is arranged outside the closed cover to drive the tilting machine to flip the slag pot.

10. The dry granulation device for molten steel slag according to claim 9, characterized in that: The tilting machine rotates about a second horizontal direction perpendicular to the first horizontal direction to overturn the slag pot in a longitudinal plane.

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