Oxidized pellet circular cooler three-section waste heat utilization system
By setting up an electric discharge valve and cyclone dust collector at the top of the chimney of the oxidized ball ring chimney, the induced fan is used to increase the flue gas pressure and drive the unpowered dust removal and cleaning mechanism, the waste heat utilization and dust cleaning of the waste flue gas in the third section of the ring chimney are solved. The problem has achieved efficient utilization of flue gas and improved fuel quality.
Patent Information
- Application Number
- CN202411589356.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-01-17
AI Technical Summary
In the oxidation pellet chain grate-rotary kiln process, the waste heat of the waste flue gas in the third section of the ring cooler cannot be effectively utilized, resulting in high fuel consumption and low thermal efficiency. At the same time, the flue gas dust is difficult to clean, affecting the ring cooler pipeline. and fuel quality.
Design a three-stage waste heat utilization system for oxidized pellet ring chiller. By setting up an electric discharge valve at the top of the chimney, the waste flue gas is introduced into the cyclone dust collector, and the induced fan is used to increase the flue gas pressure, driving the unpowered dust removal and cleaning mechanism to achieve The flue gas flow power automatically removes dust in the pipeline, and the purified flue gas is used to assist combustion in the coal powder flue gas furnace.
It realizes the effective utilization of waste flue gas, saves raw coal, improves combustion efficiency, automatically cleans up dust in the pipeline, prevents dust from being blocked and mixed with fuel, and improves the thermal efficiency and fuel quality of the ring cooler.
Smart Images
Figure CN119321693A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of waste heat recovery and utilization, and in particular to a three-stage waste heat utilization system of an oxidation pelletizing ring cooler. Background Art
[0002] The chain grate-rotary kiln oxidation pelletizing process is one of the main process methods for producing oxidation pellets. More than 80% of the oxidation pellets used in steel mills around the world are produced by the chain grate-rotary kiln process. Oxidized pellets are one of the main raw materials for steel metallurgical production. Its characteristics are that the oxidation pellet production has a wide adaptability to raw materials and fuels, good metallurgical properties, and good permeability into the furnace. Therefore, it has been widely promoted and applied.
[0003] The chain grate-rotary kiln production process system includes: coal powder preparation system, bentonite fine grinding system, batching system, drying and mixing system, pelletizing system, material distribution and screening system, chain grate-rotary kiln-ring cooler, and finished product transportation system.
[0004] The main thermal system is: the roasting and cooling system includes three sets of main equipment and facilities: chain grate, rotary kiln and ring cooler. The material flow is from the chain grate to the rotary kiln and then to the ring cooler. The hot flue gas is countercurrent, the green balls are dried and preheated on the chain grate, roasted and consolidated in the rotary kiln, and cooled in the ring cooler. The ring cooler is divided into three cooling sections.
[0005] After the green balls are dried in the grate drying section I, the temperature can be raised to about 200℃, after the green balls are dried in the grate drying section II, the temperature can be raised to about 400℃, after the green balls are preheated in the grate preheating section I, the temperature can be raised to about 700℃, after the green balls are preheated in the grate preheating section II, the temperature can be raised to about 1000℃. The pellets preheated by the grate directly enter the rotary kiln with a high temperature of about 1000℃, and after oxidation roasting at 1200-1300℃ in the rotary kiln, the hot pellets at about 1150℃ are discharged to the ring cooler for cooling, and a large amount of hot flue gas is generated during the cooling process of the pellets.
[0006] The ring cooler has a central diameter of 12.5m and an effective cooling area of 50m 2 , divided into 3 areas, 3 ring coolers with air volume of 100000m 3 / h blast cooling fans correspond to three cooling zones respectively.
[0007] The ring cooler has three cooling zones. The hot flue gas temperature generated in the first cooling zone is 750-850℃, which all enters the rotary kiln through the rotary kiln head hood and is consumed as combustion-supporting air. The hot flue gas temperature generated in the second cooling zone is 550-650℃, which provides heat source for the chain grate machine exhaust preheating stage I. The hot flue gas temperature generated in the third cooling zone is lower, about 120-180℃, and is no longer used in general design, but is directly discharged into the atmosphere through the chimney.
[0008] Therefore, how to utilize the waste flue gas from the third stage of the annular cooler and improve the comprehensive utilization of flue gas waste heat is an important content and direction for reducing fuel consumption and improving thermal efficiency. At the same time, when utilizing the waste flue gas from the third stage, how to clean the flue gas dust particles in the pipeline is also a technical problem that needs to be solved urgently. Summary of the invention
[0009] The present application proposes a three-stage waste heat utilization system for an oxidation pelletizer ring cooler. In the oxidation pelletizer chain grate machine-rotary kiln production line, coal powder preparation and bentonite fine grinding also require drying with dry gas. The waste flue gas from the three stages of the ring cooler has thermal energy of 120°C-180°C. It is dust-containing flue gas after heat exchange with normal temperature air. The oxygen content is basically the same as that of normal temperature air. This part of the hot flue gas is used for combustion in a coal powder flue gas furnace after purification. Firstly, it can save raw coal, and secondly, it is beneficial to improve combustion efficiency and make the coal powder burn fully. At the same time, the present application uses the flow power of the flue gas flow to automatically remove dust in the pipeline.
[0010] To this end, the present application provides a three-stage waste heat utilization system for an oxidized pelletizing ring cooler, comprising an electric release valve connected to the three-stage release chimney of the ring cooler, the electric release valve being connected to a cyclone dust collector through a conveying pipe, the outlet of the cyclone dust collector being connected to an induced draft fan, the outlet of the induced draft fan being connected to a coal powder flue gas furnace mixing chamber or a bentonite fine grinding and drying chamber through a pipeline, an electric flow control valve being arranged on the pipeline, and an unpowered dust removal and cleaning mechanism being arranged in the conveying pipe.
[0011] By adopting the above technical solution: the top of the chimney of the third stage of the cooling machine is open, and all the waste flue gas is discharged directly into the sky. Therefore, in order to collect the flue gas, the chimney must be modified to limit the discharge of the waste flue gas. That is, an electric release valve is set at the top of the chimney, which not only retains the original release function, but also can restrict the release, so that the flow rate can be adjusted arbitrarily to adapt to the amount used in the subsequent process. It is convenient for the flue gas to be transported to the cyclone dust collector along the conveying pipeline. The dust content of the waste flue gas is relatively high, and the density of the dust-containing medium is also relatively large. The dust is in the form of small particles, with high hardness and strong abrasiveness. By setting up a cyclone dust collector, first, it can prevent the waste flue gas from being quickly blocked during transportation; second, it can reduce the scouring of the fan blades and pipelines by the flue gas; third, it can prevent the dust from mixing into the coal powder or bentonite, causing raw fuel mixing and affecting the quality of the raw fuel. The three-stage release chimney of the ring cooler is an open outlet direct discharge type. Therefore, the pressure of the waste flue gas at the outlet is less than 100Pa. Therefore, it has no conveying capacity by itself. By setting up an induced draft fan, the waste flue gas can be transported to the flue gas furnace heating pipeline through the cyclone dust collector and a nearly 100m pipeline. First, the friction resistance of the pipeline must be overcome; second, the resistance of the cyclone dust collector must be overcome; third, a head pressure of 1000Pa--1500Pa must be formed at the terminal. At the same time, by setting up an induced draft fan and changing the opening and closing degree of the electric relief valve, the electric flow control valve and the speed of the induced draft fan, the unpowered dust removal and cleaning mechanism can be driven by the flue gas flow to remove the dust inside the conveying pipeline.
[0012] Optionally, the conveying pipeline is formed by splicing a plurality of unit pipelines, and each unit pipeline is provided with a non-powered dust removal and cleaning mechanism.
[0013] By adopting the above technical solution: the unpowered dust removal and cleaning mechanism in multiple unit pipes can clean dust online at any time, collect dust, and discharge dust regularly.
[0014] Optionally, the unpowered dust removal and cleaning mechanism includes a cleaning component slidably arranged inside the unit pipe, a driven component connected to the cleaning component, and a dust collecting and discharging component arranged at the end of the unit pipe, and a trigger component is provided between the dust collecting and discharging component and the cleaning component.
[0015] By adopting the above technical solution: the cleaning component is used to scrape off the dust inside the pipe to prevent it from sticking to the wall, and the driven component is used to be driven by the flue gas flow to pull the cleaning component to move. The most important process is: when the opening of the electric relief valve is slightly small, the opening of the electric flow control valve is larger, and the speed of the induced draft fan is high, the driven component can be driven by the flue gas flow and the negative pressure state.
[0016] Optionally, a slide rail is provided inside the unit pipe, and the cleaning assembly includes a cleaning plate sliding on the slide rail, the outer end wall of the cleaning plate is in contact with the inner wall of the unit pipe, an elastic reset member is provided between the cleaning plate and the end of the unit pipe, and a plurality of ventilation holes are provided on the cleaning plate.
[0017] By adopting the above technical solution: the slide rail can limit the movement of the cleaning plate so that it can only move in a straight line along the unit pipe, and the elastic reset part can drive the cleaning plate back to form a reciprocating movement of the cleaning plate, scraping the inner wall of the unit pipe to complete dust cleaning.
[0018] Optionally, the driven component includes a fixed shaft with one end fixed to the middle of the cleaning plate, and the other end of the fixed shaft is rotatably connected to a rotating sleeve, and the rotating sleeve is provided with a plurality of driven blades.
[0019] By adopting the above technical solution: when affected by the flue gas flow, the cleaning plate is driven to move by the rotation of the driven blades.
[0020] Optionally, the dust collecting and discharging assembly includes a dust box arranged at the end of the unit pipe, a flip plate is hinged at the lower part of the dust box, an elastic pulling piece is hinged between the flip plate and the inner wall of the dust box, and a dust leakage strip hole is provided between the unit pipe and the dust box.
[0021] By adopting the above technical solution: the dust box is used to temporarily store dust. When the driven component moves to the triggering component, the triggering component is triggered to move. The triggering component pushes the flip plate to rotate, pouring out the dust in the dust box for external centralized cleaning.
[0022] Optionally, the trigger assembly includes a trigger rod whose lower end is hinged to the flip plate, and a through groove is provided on the slide rail. The upper end of the trigger rod passes through the side wall of the unit pipe and is located inside the through groove, and the top end of the trigger rod is connected to an actuated block slidably arranged in the through groove.
[0023] By adopting the above technical solution: under normal circumstances, by controlling the opening and closing degree of the electric release valve, the electric flow control valve and the rotation speed of the induced draft fan, the cleaning plate will not touch the triggering component. When the dust in the dust box accumulates to the moving degree, by controlling the opening and closing degree of the electric release valve, the electric flow control valve and the rotation speed of the induced draft fan, the cleaning plate continues to move forward, contacts the driven block, forces the driven block to move downward, and pushes the flip plate to open, so that the dust in the dust box is poured out.
[0024] Optionally, the actuated block has an actuated inclined surface portion, and the inclined direction of the actuated inclined surface portion is toward the cleaning plate.
[0025] By adopting the above technical solution, after the cleaning plate contacts the actuated inclined surface portion, the actuating rod can be driven to move downward.
[0026] Optionally, a reset tension spring is provided between the trigger rod and the outer wall of the unit pipe.
[0027] By adopting the above technical solution, the flip plate can be reset by the reset tension spring and the elastic pulling member, so as to facilitate dust collection again.
[0028] Optionally, it also includes a control system for controlling the electric release valve, cyclone dust collector, induced draft fan and electric flow control valve.
[0029] By adopting the above technical solution: the control system can be selected as a PLC automatic control system, from the flow and pressure control of the exhaust gas outlet valve, to the flow and pressure control of the induced draft fan inlet and outlet, as well as the matching of end-user parameters such as dosage, temperature, and pressure to automatically control the entire process, and set the display, prompt and alarm of the cyclone dust collector hopper material level.
[0030] The working principle and beneficial effects of this application are:
[0031] 1. This application sets an electric release valve at the top of the chimney, which not only retains the original release function, but also can constrain the release and realize arbitrary adjustment of the flow rate to adapt to the usage of the subsequent process. By setting up an induced draft fan, the waste flue gas can be transported to the flue gas furnace heating pipeline through the cyclone dust collector and a pipeline of nearly 100m. First, the friction resistance of the pipeline must be overcome; second, the resistance of the cyclone dust collector must be overcome; third, a pressure head pressure of 1000Pa--1500Pa must be formed at the terminal. At the same time, by setting up an induced draft fan and changing the opening and closing degree of the electric release valve, the electric flow control valve and the speed of the induced draft fan, the unpowered dust removal and cleaning mechanism can be driven by the flue gas flow to remove the dust inside the conveying pipeline.
[0032] 2. The cleaning component in this application is used to scrape off the dust inside the pipe to prevent it from sticking to the wall. The driven component is used to be driven by the flue gas flow to pull the cleaning component to move. The most important process is: when the opening of the electric relief valve is slightly small, the opening of the electric flow control valve is larger, and the speed of the induced draft fan is high, the driven component can be driven by the flue gas flow and the negative pressure state.
[0033] 3. Under normal circumstances, by controlling the opening and closing degree of the electric release valve, the electric flow control valve and the speed of the induced draft fan, the cleaning plate will not touch the triggering component. When the dust in the dust box accumulates to the moving degree, by controlling the opening and closing degree of the electric release valve, the electric flow control valve and the speed of the induced draft fan, the cleaning plate will continue to move forward and contact the driven block, forcing the driven block to move downward, and the dust in the dust box will be poured out by pushing the flip plate open.
[0034] 4. The control system can be selected as a PLC automatic control system, which can automatically control the entire process from the flow and pressure control of the exhaust gas outlet valve to the flow and pressure control of the induced draft fan inlet and outlet, as well as the matching of end-user parameters such as dosage, temperature, and pressure, and set the display, prompt and alarm of the cyclone dust collector hopper level. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] The present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0036] Figure 1 This is a schematic diagram of the framework structure of an embodiment of the present application;
[0037] Figure 2 This is a schematic diagram of the physical device connection structure of an embodiment of the present application;
[0038] Figure 3 This is a schematic diagram of the structure of a unit pipeline in an embodiment of the present application;
[0039] Figure 4 For the embodiments of this application Figure 3 The enlarged structural diagram at A in the middle;
[0040] Figure 5 This is a schematic diagram of the control process framework of an embodiment of the present application.
[0041] In the figure: 100, electric release valve; 200, conveying pipeline; 210, unit pipeline; 211, slide rail; 300, cyclone dust collector; 400, induced draft fan; 500, pipeline; 600, unpowered dust removal and cleaning mechanism; 610, cleaning component; 611, cleaning plate; 612, elastic reset member; 620, driven component; 621, fixed shaft; 622, rotating sleeve; 623, driven blade; 630, dust collection and discharge component; 631, dust collection box; 632, flip plate; 633, elastic pulling member; 634, dust leakage strip hole; 640, touch component; 641, touch rod; 642, through groove; 643, driven block; 644, driven inclined portion; 645, reset spring. DETAILED DESCRIPTION
[0042] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0043] like Figure 1-Figure 5As shown, this embodiment provides a three-stage waste heat utilization system of an oxidized pelletizing ring cooler, including an electric release valve 100 connected to the three-stage release chimney of the ring cooler, the electric release valve 100 is connected to the cyclone dust collector 300 through a conveying pipe 200, the outlet of the cyclone dust collector 300 is connected to an induced draft fan 400, the outlet of the induced draft fan 400 is connected to a coal powder flue gas furnace mixing chamber or a bentonite fine grinding and drying chamber through a pipeline 500, an electric flow control valve is arranged on the pipeline 500, and an unpowered dust removal and cleaning mechanism 600 is arranged in the conveying pipe 200.
[0044] The basic principle of this embodiment is that the chimney of the third stage of the cooling machine is open, and the waste flue gas is directly discharged to the sky. Therefore, in order to collect the flue gas, the chimney must be modified to limit the discharge of the waste flue gas. That is, an electric release valve 100 is set at the top of the chimney, which not only retains the original release function, but also can restrict the release, and realize the arbitrary adjustment of the flow rate to adapt to the amount of the subsequent process. It is convenient for the flue gas to be transported along the conveying pipeline 200 to the cyclone dust collector 300. The dust content of the waste flue gas is relatively high, and the density of the dust-containing medium is also relatively large. The dust is in the form of small particles, with high hardness and strong abrasiveness. By setting the cyclone dust collector 300, firstly, it can prevent the waste flue gas from being quickly blocked during the conveying process. Secondly, it can reduce the scouring of the fan blades and pipelines by the flue gas. Thirdly, it can prevent the dust from mixing into the coal powder or bentonite, causing the raw fuel to mix and affect the quality of the raw fuel. The three-stage emission chimney of the annular cooler is an open outlet direct discharge type. Therefore, the pressure of the waste flue gas at the outlet is less than 100Pa, so it has no output. In order to improve the conveying capacity, by setting up the induced draft fan 400, the waste flue gas can be transported to the flue gas furnace heating pipeline 500 through the cyclone dust collector 300 and a pipeline of nearly 100m. First, the friction resistance of the pipeline 500 must be overcome; second, the resistance of the cyclone dust collector 300 must be overcome; third, a head pressure of 1000Pa--1500Pa must be formed at the terminal. At the same time, by setting up the induced draft fan 400 and changing the opening and closing degree of the electric relief valve 100 and the electric flow control valve as well as the rotation speed of the induced draft fan 400, the unpowered dust removal cleaning mechanism 600 can be driven by the flue gas flow to remove the dust inside the conveying pipeline 200.
[0045] The conveying pipeline 200 is composed of multiple unit pipelines 210, for example, which can be connected by flanges. Each unit pipeline 210 is equipped with an unpowered dust removal and cleaning mechanism 600. The unpowered dust removal and cleaning mechanism 600 in the multiple unit pipelines 210 can clean dust online at any time, collect dust, and discharge dust regularly.
[0046] The unpowered dust removal cleaning mechanism 600 in this embodiment includes a cleaning component 610 slidably arranged inside the unit pipe 210, a driven component 620 connected to the cleaning component 610, and a dust collecting and discharging component 630 arranged at the end of the unit pipe 210, and a trigger component 640 is arranged between the dust collecting and discharging component 630 and the cleaning component 610. The cleaning component 610 is used to scrape the dust inside the pipe to prevent it from sticking to the wall, and the driven component 620 is used to be driven by the flue gas flow to pull the cleaning component 610 to move. The main process is: when the electric release valve 100 is slightly opened, the electric flow control valve is opened larger, and the induced draft fan 400 has a high speed, the driven component 620 can be driven to move by the flue gas flow and the negative pressure state.
[0047] A slide rail 211 is provided inside the unit pipe 210, and the cleaning component 610 includes a cleaning plate 611 sliding on the slide rail 211. The outer end wall of the cleaning plate 611 is in contact with the inner wall of the unit pipe 210, and an elastic reset member 612 is provided between the cleaning plate 611 and the end of the unit pipe 210. The cleaning plate 611 is provided with a plurality of ventilation holes; the slide rail 211 can limit the movement of the cleaning plate 611 so that it can only move in a straight line along the unit pipe 210, and the elastic reset member 612 can drive the cleaning plate 611 to return to its original position, thereby forming a reciprocating movement of the cleaning plate 611, scraping the inner wall of the unit pipe 210 to complete dust cleaning.
[0048] The driven component 620 includes a fixed shaft 621 with one end fixed to the middle of the cleaning plate 611, and the other end of the fixed shaft 621 is rotatably connected to a rotating sleeve 622, on which a plurality of driven blades 623 are provided. When affected by the flue gas flow, the driven blades 623 rotate to drive the cleaning plate 611 to move.
[0049] The dust collecting and discharging assembly 630 includes a dust box 631 arranged at the end of the unit pipe 210, and a flip plate 632 is hinged at the lower part of the dust box 631. An elastic pulling member 633 is hinged between the flip plate 632 and the inner wall of the dust box 631, and a dust leakage strip hole 634 is provided between the unit pipe 210 and the dust box 631.
[0050] The dust box 631 is used to temporarily store dust. When the driven component 620 moves to the trigger component 640, the trigger component 640 is triggered to move. The trigger component 640 pushes the flip plate 632 to rotate, pouring out the dust in the dust box 631 for external centralized cleaning.
[0051] The trigger assembly 640 includes a trigger rod 641 whose lower end is hinged to the flip plate 632, and a through slot 642 is provided on the slide rail 211. The upper end of the trigger rod 641 passes through the side wall of the unit pipe 210 and is located inside the through slot 642, and the top end of the trigger rod 641 is connected to an actuated block 643 slidably set in the through slot 642.
[0052] Under normal circumstances, by controlling the opening and closing degree of the electric release valve 100, the electric flow control valve and the rotation speed of the induced draft fan 400, the cleaning plate 611 will not touch the trigger component 640. When the dust in the dust box 631 accumulates to the moving degree, by controlling the opening and closing degree of the electric release valve 100, the electric flow control valve and the rotation speed of the induced draft fan 400, the cleaning plate 611 continues to move forward and contacts the driven block 643, forcing the driven block 643 to move downward, and by pushing the flip plate 632 to open, the dust in the dust box 631 is poured out.
[0053] Specifically, the actuated block 643 has an actuated inclined surface 644 , and the inclined direction of the actuated inclined surface 644 is toward the cleaning plate 611 . When the cleaning plate 611 contacts the actuated inclined surface 644 , the actuating rod 641 can be driven to move downward.
[0054] Specifically, a reset spring 645 is provided between the trigger rod 641 and the outer wall of the unit pipe 210 , and the flip plate 632 can be reset by the reset spring 645 and the elastic pulling member 633 , so as to collect dust again.
[0055] Of course, this embodiment also includes a control system for controlling the electric release valve 100, the cyclone dust collector 300, the induced draft fan 400 and the electric flow control valve.
[0056] The control system can be selected as a PLC automatic control system, which can automatically control the entire process from the flow and pressure control of the exhaust gas outlet valve to the flow and pressure control of the induced draft fan 400 inlet and outlet, as well as the matching of end-user parameters such as dosage, temperature, and pressure, and can also display, prompt, and alarm the material level of the cyclone dust collector 300.
[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. The three-stage waste heat utilization system of oxidation pellet ring cooler is characterized by: The invention comprises an electric release valve (100) connected to a three-stage release chimney of a ring cooler, wherein the electric release valve (100) is connected to a cyclone dust collector (300) via a conveying pipeline (200), the outlet of the cyclone dust collector (300) is connected to an induced draft fan (400), the outlet of the induced draft fan (400) is connected to a coal powder smoke furnace mixing chamber or a bentonite fine grinding and drying chamber via a pipeline (500), an electric flow control valve is arranged on the pipeline (500), and an unpowered dust removal and cleaning mechanism (600) is arranged in the conveying pipeline (200).
2. The three-stage waste heat utilization system of the oxidation pelletizing ring cooler according to claim 1 is characterized in that: The conveying pipeline (200) is formed by splicing a plurality of unit pipelines (210), and each unit pipeline (210) is provided with a non-powered dust removal and cleaning mechanism (600) inside.
3. The three-stage waste heat utilization system of the oxidation pelletizing ring cooler according to claim 2 is characterized in that: The unpowered dust removal cleaning mechanism (600) comprises a cleaning component (610) slidably arranged inside the unit pipe (210), a driven component (620) connected to the cleaning component (610), and a dust collecting and releasing component (630) arranged at the end of the unit pipe (210), wherein a trigger component (640) is arranged between the dust collecting and releasing component (630) and the cleaning component (610).
4. The three-stage waste heat utilization system of the oxidation pelletizing ring cooler according to claim 3 is characterized in that: A slide rail (211) is provided inside the unit pipe (210), and the cleaning assembly (610) comprises a cleaning plate (611) sliding on the slide rail (211), the outer end wall of the cleaning plate (611) is in contact with the inner wall of the unit pipe (210), an elastic reset member (612) is provided between the cleaning plate (611) and the end of the unit pipe (210), and a plurality of ventilation holes are provided on the cleaning plate (611).
5. The three-stage waste heat utilization system of the oxidation pelletizing ring cooler according to claim 4 is characterized in that: The driven component (620) comprises a fixed shaft (621) with one end fixed to the middle of the cleaning plate (611), and the other end of the fixed shaft (621) is rotatably connected to a rotating sleeve (622), and a plurality of driven blades (623) are provided on the rotating sleeve (622).
6. The three-stage waste heat utilization system of the oxidation pelletizing ring cooler according to claim 3 is characterized in that: The dust collecting and discharging assembly (630) comprises a dust collecting box (631) arranged at the end of the unit pipe (210); a flip plate (632) is hingedly connected to the lower part of the dust collecting box (631); an elastic pulling member (633) is hingedly connected between the flip plate (632) and the inner wall of the dust collecting box (631); and a dust leakage strip hole (634) is provided between the unit pipe (210) and the dust collecting box (631).
7. The three-stage waste heat utilization system of the oxidation pelletizing ring cooler according to claim 5 is characterized in that: The trigger assembly (640) comprises a trigger rod (641) whose lower end is hinged to the flip plate (632); a through groove (642) is provided on the slide rail (211); the upper end of the trigger rod (641) passes through the side wall of the unit pipe (210) and is located inside the through groove (642); and the top end of the trigger rod (641) is connected to an actuated block (643) slidably arranged in the through groove (642).
8. The three-stage waste heat utilization system of the oxidation pelletizing ring cooler according to claim 7 is characterized in that: The driven block (643) has a driven inclined surface (644), and the inclined direction of the driven inclined surface (644) is toward the cleaning plate (611).
9. The three-stage waste heat utilization system of the oxidation pelletizing ring cooler according to claim 8 is characterized in that: A return tension spring (645) is provided between the trigger rod (641) and the outer wall of the unit pipe (210).
10. The three-stage waste heat utilization system of the oxidation pelletizing ring cooler according to any one of claims 1 to 9, characterized in that: It also includes a control system for controlling the electric release valve (100), the cyclone dust collector (300), the induced draft fan (400), and the electric flow control valve.