Three-stage waste heat recovery system of sintering circular cooler

Abstract

This invention relates to the field of waste heat recovery technology in sintering of iron and steel metallurgy, and discloses a three-stage waste heat recovery system for sintering ring coolers. The system includes a sintering ring cooler body, a recovery boiler, and a protective shell. The sintering ring cooler body is composed of multiple sections. A conveying pipe is installed on the third section of the sintering ring cooler body, with the other end of the conveying pipe connected to the recovery boiler. An installation pipe is installed at the bottom of the recovery boiler, with the other end of the installation pipe connected to the protective shell. This invention forms a complete closed-loop circulating gas path. The waste gas from the three stages of the sintering ring cooler body continuously enters the recovery boiler through the conveying pipe to complete waste heat recovery. After heat exchange, the waste gas is filtered, recirculated, and then reintroduced into the equipment. There is no waste gas discharge throughout the entire process. This maximizes the utilization of the waste heat resources of the three stages of the sintering ring cooler, improves energy efficiency, achieves zero emissions of flue gas from all three stages, and eliminates waste gas pollution. Simultaneously, the coordinated operation of all components ensures the long-term stable and efficient operation of the system.

Description

Technical Field

[0001] This invention belongs to the field of waste heat recovery technology in sintering of iron and steel metallurgy, specifically, it relates to a three-stage waste heat recovery system for sintering ring coolers. Background Technology

[0002] The sintering ring cooler is a core supporting equipment in the sintering process of iron and steel metallurgy. It is mainly used to cool high-temperature sintered ore. During the operation of the equipment, a large amount of medium and low temperature waste gas is generated. Among them, the three-stage waste gas has stable temperature and flow characteristics and contains abundant recoverable waste heat resources. It is a key target for waste heat recovery, energy saving and carbon reduction in the sintering process. Under the current development trend of green, low-carbon and energy-saving and efficiency-enhancing in the steel industry, efficient recovery of waste heat from the three-stage waste gas of the sintering ring cooler and reduction of flue gas emission pollution have become the core research direction for the optimization and upgrading of the sintering process.

[0003] Conventional technical solutions often employ direct exhaust of waste gas or simple waste heat utilization modes. Some enterprises directly discharge the third-stage waste gas to the outside world, which not only wastes a large amount of waste heat resources, but also carries sintering dust to form waste gas pollution, exacerbating environmental pressure. Other enterprises use the third-stage waste gas for scenarios such as preheating of combustion air and simple heat generation. The waste heat utilization form is single and the recovery efficiency is low. Only a small amount of heat energy can be effectively utilized, and the maximum cascade utilization of waste heat cannot be achieved.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: The three-stage waste heat recovery system for sintering ring coolers includes a sintering ring cooler body, a recovery boiler, and a protective shell. The sintering ring cooler body is composed of multiple sections. A conveying pipe is installed on the third section of the sintering ring cooler body. The other end of the conveying pipe is installed on the recovery boiler. An installation pipe is installed at the bottom of the recovery boiler. The other end of the installation pipe is installed on the protective shell. A return pipe is installed at the other end of the protective shell, and the other end of the return pipe is installed on the third section of the sintering ring cooler body. Therefore, it can achieve three-stage waste heat recovery and zero emissions of flue gas. A fan blade assembly is installed in the inner cavity of the protective shell, and the fan blade assembly is used to transfer the heat from the recovery boiler to the third section of the sintering ring cooler body.

[0006] In a preferred embodiment of the present invention, the outer wall of the recycling boiler is provided with an outer ring mounting component, and the bottom of the outer ring mounting component is provided with three mounting support legs arranged in a circular pattern, and the mounting support legs are used to support the recycling boiler.

[0007] In a preferred embodiment of the present invention, the protective housing is provided with filter plates at the installation pipe and the return pipe, respectively. The filter plates are used to ensure that the gas recycled into the sintering ring cooler body is free of impurities to a certain extent.

[0008] In a preferred embodiment of the present invention, a circular mounting shell is provided inside the protective shell, the circular mounting shell has a slot, and a left guide plate and a right guide plate are respectively provided on both sides of the circular mounting shell.

[0009] In a preferred embodiment of the present invention, a servo motor is provided on the outer wall of the protective housing, and a rotating rod is provided at the output end of the servo motor. The rotating rod movably passes through the protective housing, and a main bevel gear is provided at its port. A secondary bevel gear is vertically meshed on the main bevel gear, and the secondary bevel gear is rotatably disposed in a slot opened on the circular mounting housing.

[0010] In a preferred embodiment of the present invention, the secondary bevel gear is further provided with a rotating rod, and the other end of the rotating rod is provided with a driving gear. The driving gear passes through a slot opened on the circular mounting housing, and a toothed ring is meshed on the driving gear.

[0011] In a preferred embodiment of the present invention, the inner cavity of the circular mounting housing is further provided with two annular positioning members, the two annular positioning members are symmetrical to each other, and a circular mounting ring is rotatably disposed between the two annular positioning members, and a toothed ring is provided on the outer wall of the circular mounting ring.

[0012] In a preferred embodiment of the present invention, the inner wall of the circular mounting ring is provided with three connectors, and a fan blade assembly is connected to the connectors. The fan blade assembly consists of a rotating rod and a fan blade, and the rotating rod is disposed on the connector.

[0013] Compared with the prior art, the present invention has the following advantages: This invention forms a complete closed-loop circulating gas path in the overall equipment. The exhaust gas from the three stages of the sintering ring cooler body continuously enters the recovery boiler through the conveying pipeline to complete the waste heat recovery. After heat exchange, the exhaust gas is filtered, recirculated, and then sent back into the equipment. There is no exhaust gas discharge throughout the process. This maximizes the utilization of the waste heat resources of the three stages of the sintering ring cooler, improves energy utilization efficiency, and achieves zero emissions of flue gas from the three stages, eliminating exhaust gas pollution. At the same time, the various structures work together to ensure the long-term stable and efficient operation of the system.

[0014] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0015] In the attached diagram: Figure 1A three-dimensional structural diagram of the waste heat recovery system for the three-stage exhaust gas of the sintering ring cooler; Figure 2 This is a rear view schematic diagram of the three-stage waste heat recovery system for the sintering ring cooler. Figure 3 A cross-sectional schematic diagram of the protective shell structure of the three-stage waste heat recovery system for the sintering ring cooler. Figure 4 A schematic diagram of the internal structure of the protective shell of the three-stage waste heat recovery system for the sintering ring cooler. Figure 5 A schematic cross-sectional view of the inner cavity of the protective shell of the three-stage waste heat recovery system for the sintering ring cooler. Figure 6 A schematic diagram of the overall structure of the inner cavity of the protective shell of the three-stage waste heat recovery system for the sintering ring cooler. Figure 7 This is a schematic diagram of the exploded structure of the toothed ring and annular positioning component of the three-stage waste gas waste heat recovery system of the sintering ring cooler.

[0016] In the diagram: 1. Sintering ring cooler body; 2. Conveying pipe; 3. Recovery boiler; 4. Outer ring mounting component; 5. Mounting support leg; 6. Mounting pipe; 7. Protective shell; 8. Return pipe; 9. Servo motor; 10. Filter plate; 11. Circular mounting shell; 12. Left guide plate; 13. Right guide plate; 14. Rotating rod; 15. Main bevel gear; 16. Secondary bevel gear; 17. Drive gear; 18. Gear ring; 19. Circular mounting ring; 20. Connecting component; 21. Fan blade assembly; 22. Annular positioning component. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0018] like Figures 1 to 7As shown, the three-stage waste heat recovery system for the sintering ring cooler includes the sintering ring cooler body 1, the recovery boiler 3, and the protective shell 7. The sintering ring cooler body 1 is composed of multiple sections. A conveying pipe 2 is provided on the third section of the sintering ring cooler body 1. The other end of the conveying pipe 2 is provided on the recovery boiler 3. An installation pipe 6 is provided at the bottom of the recovery boiler 3. The other end of the installation pipe 6 is provided on the protective shell 7. A return pipe 8 is provided at the other end of the protective shell 7, and the other end of the return pipe 8 is provided on the third section of the sintering ring cooler body 1. Therefore, it can achieve three-stage waste heat recovery and three-stage zero emission of flue gas. A fan blade assembly 21 is provided in the inner cavity of the protective shell 7, and the fan blade assembly 21 is used to transport the heat from the recovery boiler 3 to the third section of the sintering ring cooler body 1. The entire equipment forms a complete closed-loop circulating gas path. The exhaust gas from the three stages of the sintering ring cooler body 1 continuously enters the recovery boiler 3 through the conveying pipeline 2 to complete the waste heat recovery. After heat exchange, the exhaust gas is filtered, recirculated, and then sent back into the equipment. There is no exhaust gas discharge throughout the process. This maximizes the utilization of the waste heat resources of the three stages of the sintering ring cooler, improves energy utilization, and achieves zero emissions of flue gas from the three stages, eliminating exhaust gas pollution. At the same time, the various structures work together to ensure the long-term stable and efficient operation of the system.

[0019] In a specific embodiment, the outer wall of the recovery boiler 3 is provided with an outer ring mounting component 4, and the bottom of the outer ring mounting component 4 is provided with three circumferentially distributed mounting support legs 5, which are used to support the recovery boiler 3. In this configuration, the outer ring mounting component 4 achieves a stable docking assembly between the recovery boiler 3 and the mounting support legs 5. The three circumferentially distributed mounting support legs 5 can evenly distribute the overall weight of the recovery boiler 3, resulting in balanced load-bearing and effectively improving the overall stability of the recovery boiler 3 after installation. This avoids problems such as displacement, shaking, and tipping during long-term operation. At the same time, this assembly structure is simple, has high support strength, and facilitates the installation, fixing, and subsequent maintenance of the equipment, providing a reliable structural guarantee for the smooth operation of waste heat recovery.

[0020] Furthermore, the protective shell 7 is equipped with filter plates 10 at the installation pipe 6 and the return pipe 8, respectively. The filter plates 10 are used to ensure that the gas entering the sintering ring cooler body 1 is free of impurities to a certain extent. In this configuration, filter plates 10 are installed at the key passages where the exhaust gas enters the protective shell 7 and returns to exit the protective shell 7. This allows for dual filtration of the exhaust gas after heat exchange, effectively intercepting impurities such as sintering dust and solid particles carried in the exhaust gas, significantly purifying the circulating gas, preventing impurities from entering the pipeline and equipment with the airflow, preventing pipeline blockage, internal dust accumulation and wear, ensuring smooth operation of the closed-loop gas path, and effectively protecting the internal structure of the sintering ring cooler body 1 and the recovery boiler 3, extending the overall service life of the equipment.

[0021] Furthermore, a circular mounting housing 11 is provided inside the protective housing 7. The circular mounting housing 11 has a slot, and a left guide plate 12 and a right guide plate 13 are respectively provided on both sides of the circular mounting housing 11. In this configuration, the circular mounting housing 11 serves as the core mounting carrier for the internal transmission structure and the fan blade assembly 21, providing a stable mounting foundation for the subsequent gear transmission and fan blade rotation structure. The slot in the housing is used to adapt to the assembly and operation of the gear transmission structure, avoiding interference with structural movement. The left guide plate 12 and the right guide plate 13 on both sides can regulate the airflow direction inside the protective housing 7, concentrate the airflow direction, reduce airflow turbulence, eddies, and leakage, improve the smoothness and stability of gas circulation, and ensure the efficiency of exhaust gas return and transportation.

[0022] Furthermore, a servo motor 9 is installed on the outer wall of the protective housing 7. A rotating rod 14 is installed at the output end of the servo motor 9. The rotating rod 14 movably passes through the protective housing 7, and a main bevel gear 15 is installed at its end. A secondary bevel gear 16 is vertically meshed on the main bevel gear 15. The secondary bevel gear 16 is rotatably installed in a slot opened on the circular mounting housing 11. In this configuration, the servo motor 9 serves as the power source for the entire airflow circulation system, providing stable power output. The rotating rod 14 drives the main bevel gear 15 to rotate synchronously. Utilizing the vertical meshing transmission principle of the main bevel gear 15 and the secondary bevel gear 16, the power is vertically redirected and transmitted, changing the direction of power transmission. This adapts to the narrow installation space inside the protective housing 7. At the same time, the bevel gear meshing transmission has high precision and stable power transmission, ensuring uniform operation of subsequent structures and providing continuous and stable power support for gas circulation.

[0023] Furthermore, the secondary bevel gear 16 is also equipped with a rotating rod, and the other end of the rotating rod is equipped with a driving gear 17. The driving gear 17 passes through a slot opened in the circular mounting housing 11, and a gear ring 18 is meshed on the driving gear 17. In this configuration, the secondary bevel gear 16 is also equipped with a rotating rod, and the other end of the rotating rod is equipped with a driving gear 17. The driving gear 17 passes through a slot opened in the circular mounting housing 11, and a gear ring 18 is meshed on the driving gear 17. In this configuration, during the rotation of the secondary bevel gear 16, the driving gear 17 can be driven to rotate synchronously through the rotating rod, realizing the step-by-step transmission of power. The meshing transmission between the driving gear 17 and the gear ring 18 can convert high-speed rotational power into the ring rotational power of the gear ring 18. The transmission structure is compact and the transmission ratio is stable, which can effectively reduce power loss and ensure the high efficiency of power transmission. At the same time, the through-type assembly structure can avoid jamming and tooth disengagement during transmission, improving the operational stability of the equipment.

[0024] Furthermore, the inner cavity of the circular mounting housing 11 is also provided with two annular positioning elements 22. The two annular positioning elements 22 are symmetrical to each other, and a circular mounting ring 19 is rotatably arranged between the two annular positioning elements 22. A toothed ring 18 is provided on the outer wall of the circular mounting ring 19. In this arrangement, the two symmetrically arranged annular positioning elements 22 can provide bidirectional limiting, guiding and supporting functions for the circular mounting ring 19, restricting the radial and axial offset of the circular mounting ring 19, ensuring that the circular mounting ring 19 can rotate smoothly and steadily on the preset trajectory, effectively avoiding problems such as shaking, offset, and jamming during the rotation of the circular mounting ring 19, and at the same time providing stable support for the meshing operation of the toothed ring 18, ensuring the continuous and stable operation of the overall transmission structure.

[0025] Furthermore, the inner wall of the circular mounting ring 19 is provided with three connectors 20, and a fan blade assembly 21 is connected to the connectors 20. The fan blade assembly 21 consists of a rotating rod and fan blades, and the rotating rod is set on the connector 20. In this configuration, the three connectors 20 are evenly distributed, which can stably fix the fan blade assembly 21, ensure the connection strength between the fan blade assembly 21 and the circular mounting ring 19, and avoid the problem of fan blades loosening or falling off during high-speed rotation. When the circular mounting ring 19 rotates, the fan blade assembly 21 can be driven to rotate synchronously at high speed through the connectors 20. With the wind pressure generated by the rotation of the fan blades, a strong airflow is provided for the exhaust gas circulation inside the closed loop pipeline, which pushes the exhaust gas after heat exchange and filtration to flow back stably to the third section of the sintering ring cooler body 1, ensuring the continuous operation of the entire waste heat recovery closed loop system.

[0026] The implementation principle of the three-stage waste gas heat recovery system for the sintering ring cooler of the present invention is as follows: The high-temperature exhaust gas generated in the third section of the sintering ring cooler body 1 is stably transported to the inside of the recovery boiler 3 through the pre-set conveying pipeline 2. The recovery boiler 3 can fully absorb the waste heat in the exhaust gas, complete the recovery and utilization of the waste heat of the exhaust gas, and realize the conversion and storage of thermal energy. The recovery boiler 3 is fixed and supported by an outer ring mounting piece 4 on the outer wall and three circumferentially distributed mounting support legs 5 at the bottom, which ensures the structural stability of the equipment during operation and prevents the equipment from shaking and affecting the waste gas conveying and waste heat recovery operations. After the waste heat exchange is completed, the exhaust gas remains in the closed-loop pipeline and is transported to the inside of the protective shell 7 through the installation pipe 6 connected to the bottom of the recovery boiler 3. The protective shell 7 is equipped with filter plates 10 at the interface between the installation pipe 6 and the return pipe 8. During the flow of exhaust gas, the filter plates 10 can effectively intercept dust, impurities and other particulate matter in the exhaust gas, which to a certain extent ensures that the gas returned to the sintering ring cooler body 1 is clean and free of impurities, and avoids the accumulation of impurities that may cause pipeline blockage. The servo motor 9 (model 130ST-M15025) mounted on the outer wall of the protective housing 7 provides power support for the internal airflow circulation. When the servo motor 9 is working, it drives the rotating rod 14 at the output end to rotate. The rotating rod 14 passes through the protective housing 7 and drives the main bevel gear 15 (model Z15-20° spur bevel gear) at the port to rotate synchronously. Through vertical meshing transmission, it drives the secondary bevel gear 16 (model Z15-20° matching driven bevel gear) to rotate (and the secondary bevel gear 16 is installed inside the slot of the circular mounting housing 11). When the secondary bevel gear 16 rotates, it can also drive the rotating rod to rotate, thereby driving the driving gear 17 (model M5 precision spur gear) to rotate synchronously. The driving gear 17 meshes with the toothed ring 18 (model M5 ring gear) on the outer side of the circular mounting ring 19, thereby driving the toothed ring 18 and the circular mounting ring 19 to rotate as a whole. The two annular positioning elements 22 symmetrically arranged in the inner cavity of the circular mounting housing 11 play a limiting and positioning role for the circular mounting ring 19, ensuring that the circular mounting ring 19 can rotate stably. Meanwhile, the fan blade assembly 21 is fixedly installed on the inner wall of the circular mounting ring 19 by three evenly distributed connectors 20. Driven by the circular mounting ring 19, the fan blade assembly 21 rotates at high speed. At the same time, the left guide plate 12 and the right guide plate 13 on both sides of the circular mounting housing 11 regulate the airflow direction and stably transport the clean gas inside the protective housing 7 after filtration and pressure regulation back to the third section of the sintering ring cooler body 1 through the return pipe 8. The entire equipment forms a complete closed-loop circulating gas path. The exhaust gas from the three stages of the sintering ring cooler body 1 continuously enters the recovery boiler 3 through the conveying pipeline 2 to complete the waste heat recovery. After heat exchange, the exhaust gas is filtered, recirculated, and then sent back into the equipment. There is no exhaust gas discharge throughout the process. This maximizes the utilization of the waste heat resources of the three stages of the sintering ring cooler, improves energy utilization, and achieves zero emissions of flue gas from the three stages, eliminating exhaust gas pollution. At the same time, the various structures work together to ensure the long-term stable and efficient operation of the system. Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended 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 make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A three-stage waste heat recovery system for sintering ring coolers, comprising a sintering ring cooler body (1), a recovery boiler (3), and a protective shell (7), characterized in that: The sintering ring cooler body (1) is composed of multiple sections. The sintering ring cooler body (1) is provided with a conveying pipe (2) on the third section. The other end of the conveying pipe (2) is provided on the recovery boiler (3). The bottom of the recovery boiler (3) is provided with an installation pipe (6). The other end of the installation pipe (6) is provided on the protective shell (7). The other end of the protective shell (7) is provided with a return pipe (8). The other end of the return pipe (8) is provided on the third section of the sintering ring cooler body (1). Therefore, the waste heat of the flue gas in the three sections can be recovered and the flue gas in the three sections can be zero-emission. The inner cavity of the protective shell (7) is provided with a fan blade assembly (21). The fan blade assembly (21) is used to convey the heat from the recovery boiler (3) to the third section of the sintering ring cooler body (1).

2. The three-stage waste gas waste heat recovery system for the sintering ring cooler according to claim 1, characterized in that, The outer wall of the recycling boiler (3) is provided with an outer ring mounting component (4), and the bottom of the outer ring mounting component (4) is provided with three mounting support legs (5) arranged in a circular pattern, and the mounting support legs (5) are used to support the recycling boiler (3).

3. The three-stage waste gas waste heat recovery system for the sintering ring cooler according to claim 1, characterized in that, The protective housing (7) is provided with filter plates (10) at the installation pipe (6) and return pipe (8), respectively. The filter plates (10) are used to ensure that the gas recycled into the sintering ring cooler body (1) is free of impurities to a certain extent.

4. The three-stage waste gas waste heat recovery system for the sintering ring cooler according to claim 3, characterized in that, The protective housing (7) is provided with a circular mounting housing (11), the circular mounting housing (11) is provided with a slot, and the circular mounting housing (11) is provided with a left guide plate (12) and a right guide plate (13) on both sides respectively.

5. The three-stage waste gas waste heat recovery system for the sintering ring cooler according to claim 3, characterized in that, A servo motor (9) is provided on the outer wall of the protective housing (7). A rotating rod (14) is provided at the output end of the servo motor (9). The rotating rod (14) moves through the protective housing (7) and is provided at the port with a main bevel gear (15). A secondary bevel gear (16) is vertically meshed on the main bevel gear (15). The secondary bevel gear (16) is rotatably disposed in a slot opened on the circular mounting housing (11).

6. The three-stage waste gas waste heat recovery system for the sintering ring cooler according to claim 5, characterized in that, The secondary bevel gear (16) is also provided with a rotating rod, and the other end of the rotating rod is provided with a driving gear (17). The driving gear (17) passes through the slot opened on the circular mounting housing (11), and a toothed ring (18) is meshed on the driving gear (17).

7. The three-stage waste gas waste heat recovery system for the sintering ring cooler according to claim 4, characterized in that, The inner cavity of the circular mounting housing (11) is also provided with two annular positioning elements (22). The two annular positioning elements (22) are symmetrical to each other, and a circular mounting ring (19) is rotatably arranged between the two annular positioning elements (22). A toothed ring (18) is provided on the outer wall of the circular mounting ring (19).

8. The three-stage waste gas waste heat recovery system for the sintering ring cooler according to claim 7, characterized in that, The inner wall of the circular mounting ring (19) is provided with three connectors (20), and a fan blade assembly (21) is connected to the connector (20). The fan blade assembly (21) consists of a rotating rod and a fan blade, and the rotating rod is provided on the connector (20).

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