A sinter high-efficiency waste heat recovery device and a method of using the same

Abstract

The application discloses a kind of sinter efficient waste heat recovery equipment and its using method, it is related to metallurgical energy saving, environmental protection technical field, including the cooling mechanism for recovering the waste heat after sinter crushing, the ventilation mechanism for ventilation is fixedly installed at the bottom end of cooling mechanism, the load fixed end for guiding sinter accumulation is fixedly connected in cooling mechanism inside rear end, the load fixed end includes load base plate, and the material stacking guide plate is fixedly connected in load base plate bottom end;The load mobile end for controlling sinter flat laying is provided at the front end of load fixed end;The load mobile end includes six ventilation grating columns, ventilation hole is penetrated and arranged in the top of each ventilation grating column, and longitudinal baffle is fixedly connected on the left and right sides of the top of each ventilation grating column;Meanwhile, when using, only air is taken from the set air outlet position by adopting the fully enclosed casing structure, the problem of high leakage rate of original ring cooler is solved, and then the fan energy consumption is reduced.

Description

Technical Field

[0001] This invention relates to the fields of metallurgical energy conservation and environmental protection technology, specifically to a high-efficiency waste heat recovery device for sintered ore and its usage method. Background Technology

[0002] With the further implementation of the dual-carbon policy, industries such as power, steel, and building materials, as major carbon emitters, are facing enormous pressure to conserve energy, reduce emissions, and lower carbon emissions. Currently, the waste heat recovery process for sintered ore in the steel industry still uses ring coolers to recover waste heat from sintered ore.

[0003] However, the existing technology has the following problems: 1. Existing ring-type coolers have a high air leakage rate, typically between 15% and 30%, which leads to increased energy consumption and affects performance.

[0004] 2. The cooling trolley grate in the existing technology is prone to deformation and the adhesion of sintered ore can easily cause equipment failure, requiring downtime for maintenance and affecting processing efficiency.

[0005] 3. In the existing technology, the cooling process of sintered ore is uneven, which leads to a decrease in the strength of the sintered ore. The maximum temperature difference can exceed 100 degrees Celsius, which has a serious impact on the quality of the sintered ore. Summary of the Invention

[0006] To address the shortcomings mentioned in the background section, the present invention aims to provide a high-efficiency waste heat recovery device for sintered ore and its usage method.

[0007] The objective of this invention can be achieved through the following technical solutions: A high-efficiency waste heat recovery device for sinter and its usage method include a cooling mechanism for recovering waste heat after crushing sinter, wherein a ventilation mechanism for ventilation is fixedly installed at the bottom end of the cooling mechanism, and a bearing fixed end for guiding the accumulation of sinter is fixedly connected to the rear end of the inner side of the cooling mechanism. The bearing fixed end includes a bearing base plate, and a material stacking guide plate is fixedly connected to the bottom end of the bearing base plate; The front end of the fixed bearing end is provided with a movable bearing end for controlling the spreading of sintered ore; The carrier mobile end includes six sets of ventilation grate columns, each ventilation grate column has a ventilation hole through the top, and each ventilation grate column has longitudinal baffles fixedly connected to the left and right sides of the top.

[0008] Furthermore, the cooling mechanism includes a housing, with a feed inlet on the front side of the top of the housing, a high-temperature air intake and a medium-temperature air intake respectively arranged from front to back on the top of the housing, and an exhaust air intake on the side of the top of the housing away from the feed inlet.

[0009] Furthermore, the feed inlet includes a stacking baffle, and a bearing baffle is provided at the bottom end of the stacking baffle. The bearing baffle is hinged to the inner side wall of the machine housing. A limit spring is provided at the bottom end of the bearing baffle. The top end of the limit spring is fixedly connected to the bottom end of the stacking baffle and the bottom end of the limit spring is fixedly connected to the top end of the bearing baffle.

[0010] Furthermore, the ventilation mechanism includes an air guide chamber, with multiple air guide openings on the outer side of the air guide chamber, and an air guide baffle slidably connected to the bottom end of the air guide chamber.

[0011] Furthermore, a horseshoe-shaped inlet grate is provided at the top of the stacking guide plate, and a guide bracket is fixedly connected to the end of the stacking guide plate facing the carrying moving end.

[0012] Furthermore, each longitudinal baffle is also arranged with multiple transverse baffles at its top. A telescopic pusher is fixedly connected to the end of the ventilation grate column near the feed inlet, and a hydraulic cylinder is fixedly connected to the end of the telescopic pusher away from the ventilation grate column.

[0013] A method for using a high-efficiency waste heat recovery device for sintered ore, comprising the following steps: Step 1: First, connect the sintering machine to the feed port and let the sintering ore temporarily store at the top of the bearing baffle. When the weight of the incoming sintering ore reaches the threshold of the limit spring, press the bearing baffle to flip to the bottom, so that the sintering ore at the top of the bearing baffle falls into the top of the bearing bottom plate and accumulates on the top of the bearing bottom plate. Step 2: The sintered ore entering the top of the supporting base plate moves to the top of the ventilation grate row near the feed inlet under the influence of the horseshoe-shaped inlet grate. At this time, cooling air is introduced into the cooling mechanism through the air guide, allowing the cooling air to pass through the ventilation grate row and through the cobblestone layer laid at the top of the ventilation grate row to contact the sintered ore and absorb the heat of the sintered ore. Step 3: Simultaneously with the previous step, the hydraulic cylinder receives an external control signal and drives the telescopic pusher plate to move the ventilation grate columns. The six ventilation grate columns move synchronously away from the feed inlet, causing the sintered ore piled up near the bearing base plate to move away from the feed inlet. Then, the first and fourth ventilation grate columns are controlled to move in the opposite direction, followed by the second and fifth ventilation grate columns. Finally, the third and sixth ventilation grate columns are controlled to move in the opposite direction, returning the six ventilation grate columns to their original state before the movement, completing one operating cycle. Step 4: During the movement in the previous step, the sintered ore slowly moves towards the exhaust air outlet. During this process, the sintered ore and the cooling air come into full contact to carry out cooling. At the same time, the hot air after absorbing heat is collected through the high-temperature air inlet, medium-temperature air inlet and exhaust air outlet at the top of the casing to realize waste heat recovery.

[0014] The beneficial effects of this invention are: 1. This invention solves the problem of high air leakage rate of the original ring cooler by adopting a fully enclosed casing structure and drawing air only from the set air intake position, thereby reducing the energy consumption of the fan.

[0015] 2. This invention lays pebbles on the top of the ventilation grate array, allowing the pebble layer to directly contact the sinter, thereby preventing the sinter from directly contacting the ventilation grate array. This effectively protects the ventilation grate array, reduces maintenance frequency, and ensures processing efficiency.

[0016] 3. The present invention adopts a step-by-step movement method, which drives the ventilation grate plate array to move step by step, thus fully extending the contact time between the sinter and the cooling gas, allowing the sinter to cool down sufficiently, avoiding the problem of excessive temperature difference, and ensuring the strength of the sinter. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the cooling mechanism of the present invention.

[0020] Figure 3 This is a schematic diagram of the ventilation mechanism structure of the present invention.

[0021] Figure 4 This is a schematic diagram of the fixed end structure of the present invention.

[0022] Figure 5 yes Figure 4 Enlarged diagram of point A in the middle.

[0023] In the diagram: 1. Cooling mechanism; 11. Casing; 12. Feed inlet; 121. Stacking baffle; 122. Bearing baffle; 123. Limiting spring; 13. High-temperature air intake; 14. Medium-temperature air intake; 15. Excess air outlet; 2. Ventilation mechanism; 21. Air guide chamber; 22. Air guide outlet; 23. Air guide baffle; 3. Bearing fixed end; 31. Bearing base plate; 32. Horseshoe-shaped inlet grate; 33. Stacking guide plate; 34. Guide bracket; 4. Bearing moving end; 41. Ventilation grate row; 42. Ventilation hole; 43. Longitudinal baffle; 44. Transverse baffle; 45. Telescopic push plate; 46. Hydraulic cylinder. Detailed Implementation

[0024] 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 embodiments of the present invention, and not all embodiments. 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.

[0025] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0026] A high-efficiency waste heat recovery device for sintered ore and its usage method, such as Figure 1 As shown, it includes a cooling mechanism 1 for recovering the residual heat after crushing sinter. A ventilation mechanism 2 for ventilation is fixedly installed at the bottom of the cooling mechanism 1. A bearing fixed end 3 for guiding the accumulation of sinter is fixedly connected to the rear end of the inner side of the cooling mechanism 1. A bearing moving end 4 for controlling the flat spreading of sinter is provided at the front end of the bearing fixed end 3.

[0027] The cooling mechanism 1 distributes the waste heat of the sinter, the ventilation mechanism 2 is used for ventilation to transfer the heat during the cooling of the sinter, the fixed bearing end 3 is used to guide the material into the cooling mechanism 1 when the sinter is fed, and the moving bearing end 4 is used to directly carry the sinter and separate and spread it out to maximize the cooling effect of the sinter.

[0028] like Figure 2 As shown, the cooling mechanism 1 includes a housing 11, with a feed inlet 12 on the front side of the top of the housing 11. A high-temperature air intake 13 and a medium-temperature air intake 14 are respectively provided on the top of the housing 11 from front to back. An exhaust air intake 15 is provided on the side of the top of the housing 11 away from the feed inlet 12.

[0029] Sintered ore enters through the feed inlet 12 at the top front of the casing 11. The high-temperature air intake 13 and the medium-temperature air intake 14 are used to recover the heat emitted during the cooling of the sintered ore. The waste air intake 15 is used to directly connect to the existing dust collector to remove excess gas and discharge it. The high-temperature air intake 13 is closer to the feed inlet 12 than the medium-temperature air intake 14. After the sintered ore enters the feed inlet 12, it will first accumulate at the bottom of the feed inlet 12. Therefore, the gas temperature recovered at the high-temperature air intake 13 is higher than that at the medium-temperature air intake 14, while the gas temperature recovered at the waste air intake 15 is the lowest.

[0030] like Figure 4As shown, the feed inlet 12 includes a stacking baffle 121, and a bearing baffle 122 is provided at the bottom of the stacking baffle 121. The bearing baffle 122 is hinged to the inner side wall of the housing 11. A limit spring 123 is provided at the bottom of the bearing baffle 122. The top end of the limit spring 123 is fixedly connected to the bottom end of the stacking baffle 121, and the bottom end of the limit spring 123 is fixedly connected to the top end of the bearing baffle 122.

[0031] The sinter is first piled up after being fed into the feed inlet 12 by the stacking baffle 121. The interaction between the bearing baffle 122 and the limiting spring 123 allows the sinter to enter the top of the bearing bottom plate 31 along the guiding direction of the bearing baffle 122. In the waste heat recovery stage, the limiting spring 123 blocks the bearing baffle 122, preventing hot air from being discharged from the feed inlet 12 and reducing the waste of heat.

[0032] like Figure 3 As shown, the ventilation mechanism 2 includes an air guide chamber 21, with multiple air guide ports 22 on the outside of the air guide chamber 21, and an air guide baffle 23 slidably connected to the bottom of the air guide chamber 21.

[0033] Gas is introduced through the air inlet 22 on the outside of the air guide chamber 21, and the gas directly enters the cooling mechanism 1 through the air guide chamber 21. The air guide baffle 23 is used to divert the gas after it enters.

[0034] like Figure 4 As shown, the bearing fixed end 3 includes a bearing base plate 31, a stacking guide plate 33 is fixedly connected to the bottom end of the bearing base plate 31, a horseshoe-shaped inlet grate 32 is provided at the top end of the stacking guide plate 33, and a guide bracket 34 is fixedly connected to the end of the stacking guide plate 33 facing the bearing moving end 4.

[0035] The bottom of the supporting base plate 31 is connected to the air guide chamber 21. When the sintered ore falls onto the top of the supporting base plate 31, cooling air is output to the supporting base plate 31 through the air guide chamber 21 to prevent damage to the horseshoe-shaped inlet grate 32.

[0036] The sintered ore entering through the feed inlet 12 is directly supported by the support base plate 31. The horseshoe-shaped inlet grate plate 32 adopts a horseshoe-shaped inlet design so that the sintered ore can move evenly along the width direction of the support base plate 31 towards the support moving end 4 after falling into the feed inlet 12 from the sintering machine. The stacking guide plate 33 is used to cooperate with the guide support 34 to guide the movement of the sintered ore.

[0037] like Figure 5As shown, the mobile support 4 includes six sets of ventilation grate columns 41. Each ventilation grate column 41 has a ventilation hole 42 through its top. Each ventilation grate column 41 has a longitudinal baffle 43 fixedly connected to the left and right sides of its top. Each longitudinal baffle 43 also has multiple transverse baffles 44 arranged in an array at its top. A telescopic push plate 45 is fixedly connected to the end of the ventilation grate column 41 near the feed inlet 12. A hydraulic cylinder 46 is fixedly connected to the end of the telescopic push plate 45 away from the ventilation grate column 41. Each hydraulic cylinder 46 is set corresponding to a specific ventilation grate column 41.

[0038] The telescopic pusher plate 45 is driven by the hydraulic cylinder 46, which in turn pushes the corresponding ventilation grate plate row 41 to move. The top of the ventilation grate plate row 41 is covered with pebbles to protect the grate plate. The pebbles prevent the sinter from directly contacting the ventilation grate plate row 41, while the gaps between the pebbles allow gas to pass through from the bottom to cool the sinter. The longitudinal baffle 43 and the transverse baffle 44 are used to prevent the pebbles from sliding when the ventilation grate plate row 41 reciprocates, thus affecting its protective effect on the ventilation grate plate row 41. The hydraulic cylinder 46 is used to directly drive the telescopic pusher plate 45, which pushes the ventilation grate plate row 41 to move. The hydraulic cylinder 46 is a servo device controlled by an external electrical signal.

[0039] A method for using a high-efficiency waste heat recovery device for sintered ore, comprising the following steps: Step 1: First, connect the sintering machine to the feed port 12, so that the sinter is temporarily stored at the top of the bearing baffle 122. When the weight of the incoming sinter reaches the threshold of the limit spring 123, the bearing baffle 122 is pressed to flip to the bottom, so that the sinter at the top of the bearing baffle 122 falls into the top of the bearing bottom plate 31 and accumulates on the top of the bearing bottom plate 31. Step 2: The sintered ore entering the top of the bearing base plate 31 moves to the top of the ventilation grate 41 near the feed inlet 12 under the influence of the horseshoe-shaped inlet grate 32. At this time, cooling air is introduced into the cooling mechanism 1 through the air guide 22, allowing the cooling air to pass through the ventilation grate 41 and through the cobblestone layer laid at the top of the ventilation grate 41 to contact the sintered ore and absorb the heat of the sintered ore. Step 3: Simultaneously with the previous step, the hydraulic cylinder 46 receives an external control signal and drives the telescopic pusher 45 to move the ventilation grate column 41. The six ventilation grate columns 41 move synchronously away from the feed inlet 12, causing the sintered ore piled up near the bearing base plate 31 to move away from the feed inlet 12. Then, the first and fourth ventilation grate columns 41 are controlled to move in the opposite direction, followed by the second and fifth ventilation grate columns 41. Finally, the third and sixth ventilation grate columns 41 are controlled to move in the opposite direction, returning the six ventilation grate columns 41 to their state before moving, completing one operating cycle. Step 4: During the movement in the previous step, the sintered ore slowly moves towards the exhaust air outlet 15. During this process, the sintered ore and the cooling air come into full contact and are cooled. At the same time, the hot air after absorbing heat is collected through the high temperature air outlet 13, the medium temperature air outlet 14 and the exhaust air outlet 15 at the top of the casing 11 to realize the recovery of waste heat.

[0040] In operation, sintered ore is first fed into the feed inlet 12 via a sintering machine, allowing the material to reach the top of the stacking baffle 121. The bearing baffle 122 directly supports a portion of the sintered ore. When the supported sintered ore exceeds the threshold of the limit spring 123, the bearing baffle 122 opens, allowing the sintered ore to pass through the bearing baffle 122 and enter the top of the bearing bottom plate 31. Under the influence of the horseshoe-shaped inlet grate 32, the sintered ore at the top of the bearing bottom plate 31 can move along the bearing bottom plate 31 towards the bearing moving end 4 via the horseshoe-shaped inlet grate 32.

[0041] The design of using a load-bearing baffle 122 in conjunction with a limiting spring 123 can prevent the blown air from leaking out from the feed inlet 12, thus ensuring recycling efficiency.

[0042] After the sintered ore enters the cooling mechanism 1, it accumulates on top of the supporting base plate 31. An external control system controls a hydraulic cylinder 46 to drive telescopic pushers 45, causing all six pushers 45 to move synchronously away from the fixed supporting end 3. This allows the sintered ore to fall onto the top of the cobblestone-covered ventilation grate array 41. Then, the external control system first returns the first and fourth ventilation grate arrays 41, then the second and fifth, and finally the third and sixth, completing one cycle. An external signal then controls the hydraulic cylinder 46 to push the ventilation grate array 41 forward synchronously for the next cycle. This cycle directs the material towards the exhaust vent 15, ensuring uniform material movement. The stepping motion allows the material to fully contact the airflow entering from the bottom, and the airflow is discharged from the high-temperature air intake 13, medium-temperature air intake 14 or waste air intake 15 at the top, ensuring the cooling effect while also ensuring the waste heat recovery effect.

[0043] Waste heat recovery pipes are connected to the high-temperature air intake 13 and the medium-temperature air intake 14. The high-temperature hot air after the cooling air exchanges heat with the high-temperature sintered ore can be extracted from the outside of the upper casing 11 as needed. It can be divided into high-temperature waste air from the high-temperature air intake 13, medium-temperature waste air from the medium-temperature air intake 14, and low-temperature waste air from the waste air intake 15. Each air intake can be determined according to actual needs.

[0044] The ventilation grate row 41 is made of wear-resistant and high-temperature resistant metal material. The material chosen for ventilation grate row 41 is ZG35Cr26Ni12 series heat-resistant cast steel, to prevent the ventilation grate row 41 from being corroded and worn by the high-temperature sintered material, thus reducing its service life. The cobblestone layer is approximately 100mm thick to prevent the high-temperature sintered ore from directly contacting the ventilation grate row 41 and causing it to burn and deform. Room temperature cooling air flows out from the bottom of the ventilation grate row 41 and then passes over the cobblestones to cool the high-temperature sintered ore at the top from bottom to top.

[0045] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A high-efficiency waste heat recovery device for sintered ore, comprising a cooling mechanism (1) for recovering waste heat after crushing sintered ore, characterized in that, The cooling mechanism (1) is fixedly installed with a ventilation mechanism (2) for ventilation at the bottom end, and a bearing fixed end (3) for guiding the accumulation of sintered ore is fixedly connected to the inner rear end of the cooling mechanism (1). The bearing fixed end (3) includes a bearing base plate (31), and a stacking guide plate (33) is fixedly connected to the bottom end of the bearing base plate (31). The front end of the fixed bearing end (3) is provided with a movable bearing end (4) for controlling the sintering ore spreading. The carrier mobile end (4) includes six sets of ventilation grate columns (41), each ventilation grate column (41) has a ventilation hole (42) through the top, and each ventilation grate column (41) has a longitudinal baffle (43) fixedly connected to the left and right sides of the top.

2. The high-efficiency waste heat recovery equipment for sintered ore according to claim 1, characterized in that, The cooling mechanism (1) includes a housing (11), with a feed inlet (12) provided on the front side of the top of the housing (11), and a high-temperature air intake (13) and a medium-temperature air intake (14) provided on the top of the housing (11) from front to back respectively, and an exhaust air intake (15) provided on the side of the top of the housing (11) away from the feed inlet (12).

3. The high-efficiency waste heat recovery equipment for sintered ore according to claim 2, characterized in that, The feed inlet (12) includes a stacking baffle (121), and a bearing baffle (122) is provided at the bottom of the stacking baffle (121). The bearing baffle (122) is hinged to the inner side wall of the housing (11). A limit spring (123) is provided at the bottom of the bearing baffle (122). The top end of the limit spring (123) is fixedly connected to the bottom end of the stacking baffle (121), and the bottom end of the limit spring (123) is fixedly connected to the top end of the bearing baffle (122).

4. The high-efficiency waste heat recovery equipment for sintered ore according to claim 3, characterized in that, The ventilation mechanism (2) includes an air guide chamber (21), with multiple air guide ports (22) on the outside of the air guide chamber (21), and an air guide baffle (23) slidably connected to the bottom of the air guide chamber (21).

5. The high-efficiency waste heat recovery equipment for sintered ore according to claim 4, characterized in that, The top of the stacking guide plate (33) is provided with a horseshoe-shaped inlet grate (32), and a guide bracket (34) is fixedly connected to one end of the stacking guide plate (33) facing the bearing moving end (4).

6. The high-efficiency waste heat recovery equipment for sintered ore according to claim 5, characterized in that, Each of the longitudinal baffles (43) is also provided with a plurality of transverse baffles (44) at the top. A telescopic pusher (45) is fixedly connected to one end of the ventilation grate (41) near the feed inlet (12). A hydraulic cylinder (46) is fixedly connected to one end of the telescopic pusher (45) away from the ventilation grate (41). A layer of pebbles is laid at the top of the ventilation grate (41).

7. A method of using a high-efficiency waste heat recovery device for sintered ore, performed by the high-efficiency waste heat recovery device for sintered ore as described in claim 6, characterized in that, Includes the following steps: Step 1: First, connect the sintering machine to the feed port (12) and let the sintering ore temporarily exist at the top of the bearing baffle (122). When the weight of the incoming sintering ore reaches the threshold of the limit spring (123), press the bearing baffle (122) to flip to the bottom, so that the sintering ore at the top of the bearing baffle (122) falls into the top of the bearing bottom plate (31) and accumulates on the top of the bearing bottom plate (31). Step 2: The sintered ore entering the top of the bearing base plate (31) moves to the top of the ventilation grate (41) near the feed inlet (12) under the influence of the horseshoe-shaped inlet grate (32). At this time, cooling air is introduced into the cooling mechanism (1) through the air guide (22), allowing the cooling air to pass through the ventilation grate (41) and through the cobblestone layer laid at the top of the ventilation grate (41) to contact the sintered ore and absorb the heat of the sintered ore. Step 3: Simultaneously with the previous step, the hydraulic cylinder (46) receives an external control signal and drives the telescopic pusher plate (45) to move the ventilation grate column (41). The six ventilation grate columns (41) move synchronously away from the feed inlet (12), causing the sintered ore piled up near the bearing base plate (31) to move away from the feed inlet (12). Then, the first and fourth ventilation grate columns (41) are controlled to move in the opposite direction, then the second and fifth ventilation grate columns (41) are controlled to move in the opposite direction, and finally the third and sixth ventilation grate columns (41) are controlled to move in the opposite direction, so that the six ventilation grate columns (41) return to the state before the movement, and complete one operating cycle. Step 4: During the previous step, the sintered ore slowly moves toward the exhaust air outlet (15). During this process, the sintered ore and the cooling air come into full contact and are cooled. At the same time, the hot air after absorbing heat is collected through the high temperature air inlet (13), medium temperature air inlet (14) and exhaust air outlet (15) at the top of the casing (11) to realize the recovery of waste heat.

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