High-temperature liquid slag centrifugal granulating device for preventing slag bonding by using cooling liquid
By adopting a double-layer hollow structure and a spiral water-cooled slide design in the centrifugal pelletization device, combined with a rotary lift controller, multiple cooling of slag particles is achieved, solving the problem of insufficient slag bonding and cooling, and ensuring the reliability and resource utilization of the system.
Patent Information
- Application Number
- CN202410083751.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-19
- Publication Date
- 2025-07-25
AI Technical Summary
During the slag centrifugal granulation process, the slag is prone to bond, resulting in difficulty in slag discharge and insufficient cooling, affecting the reliability of the system operation.
The centrifugal pelletizing chamber with a double-layer hollow structure is combined with a spiral water-cooled slide and a rotary lift controller. The cooling liquid is used to perform multiple heat exchange cooling to prevent the slag particles from bonding, and the particle impact position is adjusted through the up and down reciprocating movement of the granulator to ensure uniform heat receiving of the shell.
Effectively prevent slag particles from bonding in the granulated chamber, ensure sufficient cooling, maintain the compactness of the device structure and operation reliability, and realize the full cooling and resource utilization of slag particles.
Smart Images
Figure CN120366523A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of centrifugal granulation of molten slag, and particularly to a centrifugal granulation device for high-temperature liquid molten slag that uses a coolant to prevent the adhesion of molten slag. Background Art
[0002] High-temperature molten slag has extremely high waste heat potential. For example, the blast furnace slag generated during the blast furnace ironmaking process has a temperature of about 1500 °C. Similarly, in the field of solid waste treatment, the melting technology can also generate high-temperature molten slag above 1400 °C, such as the melting treatment of municipal solid waste incineration fly ash. After appropriate cooling treatment, the molten slag can form a material rich in vitreous components. For blast furnace slag, it can be used as a raw material for cement; for solid waste, the vitreous body can effectively solidify harmful substances, reducing the potential ecological environment risks of solid waste. Subsequently, the molten slag can also be used as roadbed building materials, realizing the harmless treatment of solid waste while achieving resource utilization.
[0003] In the industrial field, the water quenching process is a common method for cooling molten slag. Specifically, by directly contacting water with molten slag, the molten slag is rapidly cooled and forms molten slag particles with a high vitreous component. However, this process consumes a large amount of water resources, and there is a serious problem that it is difficult to recover the high-temperature waste heat of molten slag. Since industrial molten slag usually contains sulfur, contacting with water will trigger chemical reactions, generating toxic gases such as hydrogen sulfide and sulfur dioxide, and these toxic gases are discharged into the atmosphere with steam, resulting in secondary pollution.
[0004] To solve the problems of the water quenching process, dry granulation technology has been proposed and developed in the past few decades. Currently, the industry generally believes that the centrifugal granulation technology is the most promising and commercially applicable dry granulation technology. This technology has a compact structure, can ensure the granulation effect of material quality, and has advantages such as low energy consumption. However, during the centrifugal granulation of molten slag, due to the influence of factors such as the cooling rate, there is a problem of molten slag adhesion, resulting in difficult slag discharge and insufficient cooling of molten slag, thus affecting the reliability of system operation and becoming a key technical bottleneck in the industrial application of centrifugal granulation technology. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to provide a centrifugal granulation device for high-temperature liquid molten slag that uses a coolant to prevent the adhesion of molten slag.
[0006] The technical solution of the present invention is a high-temperature liquid slag centrifugal granulation device using coolant to prevent slag adhesion, which includes a slag flow pipe, a centrifugal granulation chamber, a cooling water tank, a spiral water-cooled slideway, and a rotary lifting controller; a hot air outlet is provided at the top of the centrifugal granulation chamber, and a coolant outlet is provided at the bottom; the characteristics are as follows: the slag flow pipe is located above the centrifugal granulation chamber and is connected to the centrifugal granulation chamber, and the inner wall of the pipe is coated with a refractory material layer; the shell of the centrifugal granulation chamber is a double-layer hollow structure, and the outer wall of the upper part of the shell bulges outward to form a cooling water tank; the cooling water tank and the sandwich cavity of the shell are filled with coolant; a granulator is provided in the centrifugal granulation chamber, and the granulator is arranged corresponding to the cooling water tank. The granulator is controlled by a rotary lifting controller. During the slag granulation process, the rotary lifting controller drives the granulator to rotate and reciprocate up and down to granulate the slag and adjust the position where the particles impact the shell up and down, so as to ensure uniform heating of the shell and prevent local overheating of the shell from causing the slag particles to adhere to the granulation chamber shell; a spiral water-cooled slideway is arranged along the shell in the centrifugal granulation chamber, so that the particles impacting the shell fall onto the surface of the spiral water-cooled slideway and slide downward along the slideway; the spiral water-cooled slideway is a hollow structure, and the two ends of the spiral water-cooled slideway are respectively connected to the cooling water tank and the coolant outlet, so that the cavity of the spiral water-cooled slideway is filled with coolant and exchanges heat with the particles; the outer side of the spiral water-cooled slideway is bent upward to form a baffle to prevent the particles falling on the surface of the spiral water-cooled slideway from overflowing.
[0007] The present invention centrifugally granulates the liquid slag through a liftable granulator, uses the reciprocating up and down movement of the granulator to adjust the position where the particles impact the shell, so as to ensure uniform heating of the shell, and uses the coolant in the cooling water tank to effectively prevent the slag particles from adhering to the granulation chamber shell after local overheating of the shell; at the same time, by setting a spiral water-cooled slideway, the particles impacting the shell fall onto the surface of the spiral water-cooled slideway and slide downward along the slideway. During the sliding process, heat exchange is carried out with the coolant in the cavity of the spiral water-cooled slideway to ensure that the slag particles have sufficient time to fully cool and solidify, and the cooling time of the slag particles is prolonged. The present invention enables the slag particles to undergo multiple heat exchange coolings in the centrifugal granulation chamber, and solves the problem that the slag particles are not sufficiently cooled due to accumulation and adhere.
[0008] According to the preferred solution of the high-temperature liquid slag centrifugal granulation device using coolant to prevent slag adhesion of the present invention, the flow rate of the slag in the slag flow pipe is controlled by a slag flow rate controller to prevent blockage of the slag flow pipe.
[0009] According to the preferred solution of the high-temperature liquid slag centrifugal granulation device using coolant to prevent slag adhesion of the present invention, the rotary lifting controller includes a crank and connecting rod mechanism and a motor. The crank and connecting rod mechanism drives the granulator to reciprocate up and down, and the motor drives the granulator to rotate.
[0010] According to a preferred embodiment of the high-temperature liquid slag centrifugal granulation device using a coolant to prevent slag adhesion of the present invention, a cold air inlet is provided at the bottom of the centrifugal granulation chamber to cool the droplets formed by the breakage of the liquid filaments and the flying droplets during the granulation process.
[0011] The beneficial effects of the high-temperature liquid slag centrifugal granulation device using a coolant to prevent slag adhesion of the present invention are as follows:
[0012] In the present invention, a liftable granulator is used to perform centrifugal granulation on the liquid slag. The reciprocating movement of the granulator up and down is used to adjust the position where the particles impact the housing, so as to ensure uniform heating of the housing. The coolant in the cooling water tank is used to effectively prevent the slag particles from adhering to the granulation chamber housing after local overheating of the housing. At the same time, by setting a spiral water-cooled slideway, the particles impacting the housing fall onto the surface of the spiral water-cooled slideway and slide downward along the slideway. During the sliding process, heat exchange is carried out with the coolant in the cavity of the spiral water-cooled slideway to ensure that the slag particles have sufficient time to fully cool and solidify. The present invention enables the slag particles to undergo multiple heat exchange and cooling within the limited space of the centrifugal granulation chamber, solves the problem of insufficient cooling and adhesion caused by the accumulation of slag particles, and maintains the compactness and operational reliability of the granulation chamber structure, and can be widely applied to fields such as energy and steel. Description of the Drawings
[0013] Figure 1 is a schematic structural diagram of the high-temperature liquid slag centrifugal granulation device using a coolant to prevent slag adhesion of the present invention.
[0014] Figure 2a is a front view of the slag flow pipe.
[0015] Figure 2b is a top view of the slag flow pipe. Detailed Embodiments
[0016] The following Figure 1 , Figure 2a and Figure 2b and the detailed embodiments are used to further describe the present invention in detail.
[0017] A high-temperature liquid slag centrifugal granulation device using coolant to prevent slag bonding includes a slag flow pipe 1, a centrifugal granulation chamber 2, a cooling water tank 3, a spiral water-cooled slideway 4 and a rotary lifting controller 5; a hot air outlet 21 is provided at the top of the centrifugal granulation chamber 2, and a coolant outlet 23, a particle outlet 25 and a cold air inlet 24 are provided at the bottom; the slag flow pipe 1 is located above the centrifugal granulation chamber 2 and is connected to the centrifugal granulation chamber 2. It is a semi-circular open structure and is coated with a refractory material layer inside the pipe; the slag outlet of the slag flow pipe 1 is directly above the granulator, and the flow rate of the molten slag is controlled by a molten slag flow rate controller to prevent the slag flow pipe from being blocked. The shell of the centrifugal granulation chamber 2 is a double-layer hollow structure, and the outer wall of the upper part of the shell bulges outwards to form a cooling water tank 3; the cooling water tank 3 is connected to an external coolant storage device through a pipeline to ensure that the cooling water tank 3 and the sandwich cavity of the shell are filled with coolant; a granulator 22 is provided in the centrifugal granulation chamber 2, and the granulator 22 corresponds to the cooling water tank 3. The granulator 22 is controlled by a rotary lifting controller 5. During the molten slag granulation process, the rotary lifting controller 5 drives the granulator 22 to rotate and move up and down reciprocally to granulate the molten slag and adjust the position where the particles impact the shell up and down to ensure uniform heating of the shell and prevent local overheating of the wall shell from causing the molten slag particles to adhere to the granulation chamber shell; a spiral water-cooled slideway 4 is arranged along the shell in the centrifugal granulation chamber 2 to make the particles impacting the shell fall onto the surface of the spiral water-cooled slideway 4 and slide down along the slideway; the spiral water-cooled slideway 4 is a hollow structure, and both ends of the spiral water-cooled slideway 4 are respectively connected to the cooling water tank 3 and the coolant outlet 23 to make the cavity of the spiral water-cooled slideway filled with coolant and exchange heat with the particles; the outer side of the spiral water-cooled slideway 4 is bent upwards to form a baffle to prevent the particles falling on the surface of the spiral water-cooled slideway 4 from overflowing; the spiral water-cooled slideway 4 has sufficient width and length to ensure that all the falling particles fall on the slideway surface and are fully cooled during the sliding process on the slideway.
[0018] In a specific embodiment, the rotary lifting controller 5 includes a crank and connecting rod mechanism and a motor. The crank and connecting rod mechanism drives the granulator 22 to move up and down reciprocally, and the motor drives the granulator 22 to rotate. A cold air inlet 24 is provided at the bottom of the centrifugal granulation chamber 2 to cool the liquid droplets formed by the breakage of the liquid filaments during the granulation process and the flying liquid droplets.
[0019] In specific applications, the high-temperature liquid slag flows stably into the surface of the granulator under the control of the slag flow controller 1. Under the action of the granulator 22, the liquid slag breaks into small droplets and flies in the space of the centrifugal granulation chamber 2, exchanges heat with the cooling air for the first time and solidifies into particles. After hitting the shell, it drops onto the spiral water-cooled slideway, and the high-temperature air is discharged from the air outlet 21. During the granulation process, the rotation and lifting controller 5 controls the granulator 22 to continuously move up and down reciprocally to adjust the position of particle impact, and uses the cooling water tank for secondary cooling to prevent the local over-temperature of the shell from causing deterioration of heat transfer. At the same time, relying on the action of gravity and the rebound of the shell, the slag particles fall on the surface of the spiral water-cooled slideway and exchange heat with the coolant for the third time for cooling. According to the size of the slag flow, the width and length of the spiral water-cooled slideway 4 are reasonably set according to the physical properties of the granulated particles such as particle size, etc., to ensure that the slag particles fall on the surface of the spiral water-cooled slideway and have sufficient time to fully cool and solidify. The completely cooled slag particles are discharged from the particle outlet 25 and collected for subsequent continued utilization. The coolant after heat exchange is supplied to the next-level device for heat exchange, which can recycle the coolant.
[0020] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A high-temperature liquid slag centrifugal granulation device using coolant to prevent slag adhesion, comprising a slag flow pipe (1), a centrifugal granulation chamber (2), a cooling water tank (3), a spiral water-cooled slideway (4) and a rotary lifting controller (5); a hot air outlet (21) is provided at the top of the centrifugal granulation chamber (2), and a coolant outlet (23) is provided at the bottom; characterized in that: The slag flow pipe (1) is located above the centrifugal granulation bin (2) and is communicated with the centrifugal granulation bin (2). The inside of the pipe is coated with a refractory material layer; the shell of the centrifugal granulation bin (2) is a double-layer hollow structure, and the outer wall of the upper part of the shell bulges outward to form a cooling water tank (3); the cooling water tank (3) and the sandwich cavity of the shell are filled with a coolant; a granulator (22) is arranged in the centrifugal granulation bin (2), the granulator (22) corresponds to the cooling water tank (3), and the granulator (22) is controlled by a rotary lifting controller (5). During the slag granulation process, the rotary lifting controller (5) drives the granulator (22) to rotate and move up and down reciprocally to granulate the molten slag and adjust the position where the particles impact the shell up and down, so as to ensure uniform heating of the shell and prevent local overheating of the shell from causing the molten slag particles to adhere to the granulation bin shell; a spiral water-cooled slideway (4) is arranged along the shell in the centrifugal granulation bin (2) so that the particles impacting the shell fall onto the surface of the spiral water-cooled slideway (4) and slide downward along the slideway; the spiral water-cooled slideway (4) is a hollow structure, and both ends of the spiral water-cooled slideway (4) are communicated with the cooling water tank (3) and the coolant outlet (23) respectively, so that the cavity of the spiral water-cooled slideway is filled with the coolant and heat exchange is carried out with the particles; a baffle is bent upward on the outer side of the spiral water-cooled slideway (4) to prevent the particles falling onto the surface of the spiral water-cooled slideway (4) from overflowing.
2. The high-temperature molten slag centrifugal granulation device for preventing slag adhesion by using a coolant according to claim 1, wherein: The flow rate of the molten slag in the slag flow pipe (1) is controlled by a molten slag flow controller to prevent blockage of the slag flow pipe.
3. The high-temperature liquid slag centrifugal granulation device for preventing slag adhesion by using coolant according to claim 2, wherein: The rotary lifting controller (5) includes a crank and connecting rod mechanism and a motor. The crank and connecting rod mechanism drives the granulator (22) to move up and down reciprocally, and the motor drives the granulator (22) to rotate.
4. The high-temperature liquid slag centrifugal granulation device for preventing slag from sticking by using coolant according to claim 1, characterized in that: An air inlet (24) for cold air is arranged at the bottom of the centrifugal granulation bin (2) to cool the droplets formed by the breakage of the liquid filaments and the flying droplets during the granulation process.