A high-temperature liquid slag granulation system

Abstract

This invention discloses a high-temperature liquid slag granulation system, including a granulator located at the top of a maintenance channel. A drive device is installed inside the maintenance channel, which connects to a granulation chamber and a moving bed device. The drive device includes a motor mounted on a fixed support and capable of moving up and down along the support. The motor's output shaft is connected to the granulator via a granulator shaft. A granulator shaft sleeve is fitted onto the granulator shaft, with one end of the sleeve extending outside the maintenance channel. This system improves upon the problem of unsatisfactory granulation results caused by the shaking of the granulator shaft and drive device during centrifugal granulation, accelerates heat dissipation within the maintenance channel, and protects the equipment within the maintenance channel from high temperatures.

Description

Technical Field

[0001] This invention belongs to the field of high-temperature liquid molten slag waste heat recovery technology, specifically relating to a high-temperature liquid molten slag granulation system. Background Technology

[0002] Water quenching and dry treatment are currently the most common methods for treating blast furnace slag. Water quenching involves directly mixing low-temperature cooling water with high-temperature molten slag, causing the molten slag to rapidly cool and form glassy slag particles. Water flushing methods can be categorized into the Inba process, Tula process, bottom filtration process, Lhasa process, and Mintec process, depending on the specific process flow. Despite the continuous development of water quenching, its core technology still involves spraying water to quench the high-temperature molten slag, achieving cooling and granulation, followed by water-slag separation. The flushing water is then recycled after sedimentation and filtration. Although the glassy molten slag produced by this method can be used in the cement industry for resource utilization, the process wastes a large amount of water resources, generates harmful gases such as SO2 and H2S, and cannot effectively recover the high-quality waste heat resources contained in the high-temperature molten slag. Dry treatment methods involve dry processing of the high-temperature molten slag, including mechanical crushing, air quenching, and centrifugal granulation. Mechanical granulation methods are further divided into impact granulation, mechanical stirring granulation, and rotary drum granulation. While mechanical crushing avoids water waste and the generation of harmful gases, the large and unevenly distributed size of the cooled slag particles is detrimental to subsequent applications. In some cases, additional mechanical processing is required, leading to increased energy consumption and difficulty in meeting industrial application quality requirements. Furthermore, the treated slag still has a high temperature (500–900℃), resulting in a low heat recovery rate. Air quenching, while reducing energy consumption compared to mechanical crushing, involves complex equipment and high energy consumption; it also requires high slag fluidity. With the development of steelmaking technology, steel slag has higher basicity, resulting in higher viscosity and making air quenching granulation difficult. Centrifugal granulation is a currently popular dry granulation process. Compared to mechanical crushing and air quenching, centrifugal granulation is characterized by low energy consumption and compact, simple equipment. Simultaneously, the quality and particle size of the slag particles can be well controlled by adjusting parameters such as rotation speed, granulator size, and air flow rate, thus showing broad application prospects.

[0003] Currently, centrifugal granulation is the most promising method for recovering waste heat from high-temperature molten slag. However, because the high-temperature liquid molten slag granulation device needs to be arranged in the center of the granulation chamber, this arrangement will divide the moving bed device below the granulation chamber into two parts. This significantly reduces the heat exchange space of the moving bed device. Therefore, it is necessary to find a suitable high-temperature liquid molten slag granulation system to increase the heat exchange space of the moving bed and improve the total amount of waste heat recovered by the system. In addition, since the temperature of liquid blast furnace slag is above 1350℃, the heat of the blast furnace slag is transferred from the granulator to the rotating shaft, causing the shaft temperature to be too high, reducing its strength, and causing deformation. This, in turn, affects the granulation effect of the driven granulator. At the same time, the continuous operation of the motor will also lead to an increase in temperature, which can easily cause motor failure and shorten its lifespan. Furthermore, due to structural reasons, the shaft will wobble back and forth when rotating, affecting the granulation effect of the granulator. When the granulation system malfunctions and needs maintenance, or when the granulator needs to be replaced, a fixed granulation device is very inconvenient. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-temperature liquid slag granulation system to address the shortcomings of the prior art, thereby solving the problem of low waste heat recovery rate of slag particles caused by the small heat exchange space of the moving bed.

[0005] The present invention adopts the following technical solution:

[0006] A high-temperature liquid slag granulation system includes a granulator, which is located at the top of a maintenance channel. A drive device is installed inside the maintenance channel. The maintenance channel passes through a granulation chamber and a moving bed device. The drive device includes a motor, which is mounted on a fixed support and can move up and down along the fixed support. The output shaft of the motor is connected to the granulator via a granulator shaft. A granulator shaft sleeve is fitted on the granulator shaft, and one end of the granulator shaft sleeve extends out of the maintenance channel.

[0007] Specifically, the fixed bracket is equipped with a movable fixed base, the motor is installed inside the fixed base, the fixed bracket is equipped with a stepper motor, the stepper motor is connected to the fixed base through a moving rod, and the two sides of the fixed bracket are connected to the inner wall of the maintenance channel through slide rails.

[0008] Furthermore, the fixed bracket is connected to the fixed base via a detachable fixing device.

[0009] Furthermore, a shock-absorbing device is installed between the bottom of the motor and the fixed base.

[0010] Specifically, the motor's output shaft is connected to one end of the granulator's rotating shaft via a coupling device, and the other end of the granulator's rotating shaft is fixedly connected to the granulator.

[0011] Furthermore, the granulator shaft sleeve and the coupling device are spaced apart.

[0012] Specifically, a limit device is provided between the granulator shaft and the granulator shaft sleeve, and the limit device includes at least one.

[0013] Specifically, the granulator has a disc-shaped or cup-shaped structure.

[0014] Specifically, the upper two walls of the maintenance passage are arranged at an angle.

[0015] Specifically, the outer side of the maintenance passage is equipped with a water-cooled wall, and the inner side is equipped with refractory material.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] This invention discloses a high-temperature liquid slag granulation system, which is arranged in a continuous manner within the granulation chamber and the moving bed device. This reduces the space occupied by the high-temperature liquid slag centrifugal granulation system, increases the heat exchange space of the moving bed, allows for more heating surfaces to be arranged within the moving bed, and increases the heat exchange of slag particles in the moving bed area. A fixed frame is installed inside the maintenance channel, and the upper detachable fixing device of the fixed frame can be adjusted, allowing the base to move freely up and down, thereby driving the granulator to move up and down.

[0018] Furthermore, a movable fixed base for fixing the drive unit is provided, with the lower part of the fixed base connected to the moving rod; placing the drive unit on the fixed base can limit the shaking of the centrifugal granulation unit caused by the rotation of the drive unit, increasing the stability of the drive unit, and the slide rail can pull the granulator unit out of the maintenance channel, increasing the maintenance space and improving the convenience of maintenance.

[0019] Furthermore, a detachable fixing device is provided on the fixed base, which can facilitate the disassembly, fixing and position adjustment of the motor.

[0020] Furthermore, the addition of a shock-absorbing device increases the stability of the drive unit, reduces the damage caused by shaking to the moving rod, extends the service life of the moving rod, and makes the centrifugal granulation device more stable.

[0021] Furthermore, the granulator shaft and the drive unit shaft are connected by a coupling, which helps to strengthen the stability of the connection between the granulator shaft and the drive unit shaft, and its detachability also increases the convenience of equipment maintenance.

[0022] Furthermore, a suitable distance is left between the coupling device and the granulator shaft sleeve to adjust the granulator height.

[0023] Furthermore, one or more limiting devices are provided, which can greatly reduce the problem of shaft shaking during granulation caused by insufficient precision of the mechanical structure, extend equipment life, improve granulation effect, make the particle size distribution of granulated particles more uniform, and make the operation of the granulator more stable.

[0024] Furthermore, setting the granulator to a disc or cup shape is beneficial for granulating liquid slag into slag particles, thereby improving the quality of the granulated particles.

[0025] Furthermore, the upper edge of the side wall of the maintenance passage is arranged at an angle to prevent slag particles from accumulating on the upper part of the maintenance passage.

[0026] Furthermore, the outer wall of the maintenance passage is a water-cooled wall, and the inner wall is made of refractory material, which can protect the equipment inside the passage from high temperature and extend its service life. In addition, a cooling sleeve is used to cool the granulator shaft. The cooling medium after heat exchange is discharged from the granulator shaft sleeve, which not only provides high temperature protection for the centrifugal granulation device, but also blows and cools the granulated slag, improving the quality of the slag particles after waste heat recovery.

[0027] In summary, this invention increases the heat exchange space of the moving bed, facilitating the cooling, disassembly, movement, and fixing of the granulator device, and can be effectively applied to the recovery of high-temperature sensible heat from granulated blast furnace slag particles.

[0028] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0029] Figure 1 This is a front view of the system of the present invention;

[0030] Figure 2 This is a top view of the system of the present invention;

[0031] Figure 3 This is a schematic diagram of the high-temperature liquid molten slag centrifugal granulation system of the present invention.

[0032] The components include: 1. Granulation bin and moving bed device; 2. Granulator; 3. Maintenance passage; 301. Water-cooled wall; 302. Granulator shaft; 303. Limiting device; 304. Granulator shaft sleeve; 305. Coupling device; 306. Detachable fixing device; 307. Fixed base; 308. Moving rod; 309. Fixed bracket; 310. Stepper motor; 311. Shock absorption device; 312. Refractory material; 313. Slide rail; 4. Motor. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "one side," "one end," and "one side," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0037] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0038] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0039] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0040] Please see Figure 1 and Figure 2 This invention provides a high-temperature liquid slag granulation system, including a centrifugal granulation device and a maintenance channel 3. The centrifugal granulation device includes a granulator 2, a rotating shaft and a drive device. The maintenance channel 3 is connected to the granulation chamber and the moving bed device 1. The granulator 2 is arranged at the top of the maintenance channel 3. The drive device and the moving and fixing device of the granulator 2 are arranged inside the maintenance channel 3. A water-cooled wall is provided on the outside of the maintenance channel 3 and a refractory material 312 is provided on the inside.

[0041] The high-temperature liquid molten slag centrifugal granulation system is located inside the granulation chamber and moving bed device 1, through the front and rear walls, including but not limited to the central position and other positions.

[0042] Please see Figure 3 The driving device includes a motor 4, which is installed in a fixed base 307 that can move up and down. The fixed base 307 is mounted on a fixed bracket 309. A stepper motor 310 is installed inside the fixed bracket 309. The stepper motor 310 is connected to the bottom of the fixed base 307 via a moving rod 308. The fixed bracket 309 is installed inside the maintenance channel 3, and its two sides are connected to the inner wall of the maintenance channel 3 via slide rails 313. The rotating shaft of the motor 4 is connected to one end of the granulator rotating shaft 302 via a coupling device 305. The other end of 302 is fixedly connected to granulator 2. Granulator shaft sleeve 304 is provided on the outside of granulator shaft 302. One end of granulator shaft sleeve 304 extends to the outside of maintenance channel 3. Cooling medium cools granulator shaft 302 and granulator 2 through granulator shaft sleeve 304 and is discharged through the annular channel between granulator 2 and granulator shaft sleeve 304, which plays a role in blowing and cooling granulated slag particles. Afterwards, it continues to perform gas-solid heat exchange in granulation bin and moving bed device 1 outside maintenance channel 3.

[0043] A limiting device 303 is provided between the granulator shaft 302 and the granulator shaft sleeve 304. The limiting device 303 includes at least one device, which is used to limit the shaking of the granulator shaft 302.

[0044] The limiting device 303 includes, but is not limited to, other positioning or limiting devices such as temperature-resistant positioning bearings.

[0045] The connection between the granulator shaft 302 and the drive device includes, but is not limited to, using a coupling to vertically arrange the drive device, using a transmission device to horizontally arrange the drive device, and other connection methods to arrange the drive device.

[0046] The granulator shaft sleeve 304 is equipped with air cooling, so that the cooling medium can cool the granulator shaft 302 and the granulator 2.

[0047] Cooling media include, but are not limited to, air, CO2, inert gases and other gaseous media.

[0048] A coupling device 305 is provided between the motor 4 and the granulator shaft sleeve 304. A suitable distance is left between the coupling device 305 and the granulator shaft sleeve 304 to adjust the height of the granulator 2.

[0049] The fixed base 307 includes, but is not limited to, square frame structures, round frame structures, and other forms.

[0050] The detachable fixing device 306 includes, but is not limited to, pins and other devices.

[0051] The fixed base 307 and the fixed bracket 309 are fixedly connected by a detachable fixing device 306. When the granulator 2 needs to be adjusted in height or repaired, the detachable fixing device 306 on the upper part of the fixed bracket 309 needs to be adjusted so that the fixed base 307 can move freely up and down and be pulled out of the maintenance channel via the slide rail 313. After the movement or repair is completed, the detachable fixing device 306 is adjusted to connect the fixed base 307, and the fixed base 307 continues to bear the function of fixing and protecting.

[0052] A shock-absorbing device 311 is provided between the bottom of the motor 4 and the fixed base 307. When the motor 4 is working, the fixed base provides a fixed protection for the motor 4, and the shock-absorbing device 311 can reduce the shaking of the stepper motor 310 and extend its service life.

[0053] The granulator 2 has a disc-shaped or cup-shaped structure and is fixed to one end of the granulator shaft 302.

[0054] The lower part of the fixed bracket 309 is installed on the slide rail 313 on the side wall of the maintenance passage 3, which serves to support and fix the entire drive unit and granulation unit, thereby improving the convenience of maintenance.

[0055] Please see Figure 1 and Figure 2 The drive unit also includes a cooling system, which is a maintenance access channel 3 with cooling function.

[0056] The outer wall of the maintenance passage 3 is equipped with a water-cooled wall 301. The water-cooled wall 301 can not only reduce the impact of high temperature on the maintenance passage, but also improve the waste heat recovery and the cooling rate of high temperature molten slag particles, so as to obtain high-quality molten slag particle products.

[0057] Water-cooled wall 301 includes, but is not limited to, membrane water-cooled wall, bare tube water-cooled wall, spiral tube water-cooled wall and other forms of water-cooled wall.

[0058] The inner wall of the maintenance passage 3 is lined with refractory material 312; the refractory material 312 can isolate the high temperature caused by the heat radiation of external high-temperature molten slag particles.

[0059] Refractory materials 312 include, but are not limited to, asbestos products, corundum bricks, and other refractory and high-temperature resistant materials.

[0060] The combined effect of the cooling medium (air-cooled and water-cooled wall 301) and the refractory material 312 ensures that the temperature inside the maintenance passage 3 does not exceed the maximum continuous operating temperature of the equipment.

[0061] The upper edge of the side wall of the maintenance passage 3 is arranged at an angle, and the upper section of the granulator shaft sleeve 304 is also arranged at an angle.

[0062] The working principle of the high-temperature liquid slag granulation system of the present invention is as follows:

[0063] When the granulator, granulator shaft or motor and other related components are damaged or need repair, the shaft and motor are separated by disconnecting the coupling device. A stepper motor is used to move the fixed base and the motor on top of it through the moving rod, so that it can be easily pulled out of the maintenance channel.

[0064] The granulator and rotating shaft can be removed through the manhole in the granulation chamber. Then, the fixed bracket and the motor fixed thereon can be pulled out of the maintenance channel through the bottom slide rail, making it convenient for maintenance personnel to inspect the granulation-related components.

[0065] When the motor needs to be disassembled, remove the detachable fixing device and take the motor out of the fixed base for inspection or replacement.

[0066] In summary, the high-temperature liquid slag granulation system of the present invention improves the problem of unsatisfactory granulation effect caused by the shaking of the granulator shaft and drive device during centrifugal granulation by using a granulator shaft limiting device, a movable fixed base and a fixed support, and a shock absorption device. The coupling device, the detachable fixed device of the base and the slide rail provide convenience for the maintenance of the centrifugal granulation device. The maintenance channel uses cooling medium and is equipped with water-cooled walls and refractory materials for dual cooling and high-temperature protection, which accelerates the heat dissipation in the maintenance channel and protects the device in the maintenance channel from high temperature.

[0067] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A high-temperature liquid slag granulation system, characterized in that, The device includes a granulator (2), which is located at the top of a maintenance channel (3). A drive unit is installed inside the maintenance channel (3). The maintenance channel (3) passes through the granulation chamber and the moving bed device (1). The drive unit includes a motor (4), which is mounted on a fixed support (309) and can move up and down along the fixed support (309). The output shaft of the motor (4) is connected to the granulator (2) via a granulator shaft (302). A granulator shaft sleeve (304) is fitted on the granulator shaft (302). One end of the granulator shaft sleeve (304) is... Extending out of the maintenance passage (3), a shock-absorbing device (311) is provided between the bottom of the motor (4) and the fixed base (307). The output shaft of the motor (4) is connected to one end of the granulator shaft (302) through a coupling device (305). The other end of the granulator shaft (302) is fixedly connected to the granulator (2). The granulator shaft sleeve (304) is spaced apart from the coupling device (305). A limit device (303) is provided between the granulator shaft (302) and the granulator shaft sleeve (304). The limit device (303) includes at least one. A movable fixed base (307) is provided on the fixed bracket (309). The motor (4) is located inside the fixed base (307). A stepper motor (310) is provided inside the fixed bracket (309). The stepper motor (310) is connected to the fixed base (307) through a moving rod (308). The two sides of the fixed bracket (309) are connected to the inner wall of the maintenance channel (3) through a slide rail (313).

2. The high-temperature liquid slag granulation system according to claim 1, characterized in that, The fixed bracket (309) is connected to the fixed base (307) via a detachable fixing device (306).

3. The high-temperature liquid slag granulation system according to claim 1, characterized in that, The granulator (2) has a disc-shaped or cup-shaped structure.

4. The high-temperature liquid slag granulation system according to claim 1, characterized in that, The upper two side walls of the maintenance passage (3) are arranged at an angle.

5. The high-temperature liquid slag granulation system according to claim 1, characterized in that, The maintenance passage (3) is equipped with a water-cooled wall (301) on the outside and a refractory material (312) on the inside.

Images