A waste heat recovery system for sintered ore cooling

Abstract

This utility model relates to the field of sinter cooling technology, and more particularly to a sinter cooling waste heat recovery system, including a waste heat recovery chamber. The top of the waste heat recovery chamber has an inlet pipe, and the bottom of the chamber has an outlet. A lower control valve is located at the outlet. Inside the waste heat recovery chamber is a conical air inlet frame with multiple air outlets on its bottom surface. The top of the waste heat recovery chamber has an exhaust pipe, which is sleeved on the outside of the inlet pipe. A hot air outlet is located on one side of the end of the exhaust pipe and is connected to a waste heat utilization device. By setting up a waste heat recovery chamber, with an air inlet frame and an exhaust pipe inside, and in conjunction with the lower control valve, the sensible heat of the high-temperature sinter can be recovered.

Description

Technical Field

[0001] This utility model relates to the field of sinter cooling technology, and in particular to a sinter cooling waste heat recovery system. Background Technology

[0002] In steel production, the sintering process accounts for approximately 15% of total energy consumption, with about 40% of this energy generated as sensible heat from the sintered ore. Recovering this sensible heat is a key focus for energy conservation in steel enterprises. How to achieve protective cooling of the sintered ore without affecting its quality and yield, allowing it to be conveyed to the finished ore bin via belt conveyor, while simultaneously recovering and utilizing its sensible heat energy, has been a persistent research challenge for industry professionals. Currently, sintered ore cooling primarily employs belt coolers or ring coolers, typically involving rapid cooling with high airflow and one-time loading and unloading. However, these coolers suffer from high air leakage rates, high fan power consumption, and low sensible heat recovery rates. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a sintering ore cooling waste heat recovery system in response to the above-mentioned technical deficiencies. The system adopts a waste heat recovery chamber with an air inlet frame and an exhaust pipe inside, and works in conjunction with a lower control valve to realize the recovery of sensible heat from high-temperature sintering ore. This solves the problems of high air leakage rate, high power consumption of fans, and low sensible heat recovery rate in existing coolers.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a sintered ore cooling waste heat recovery system, including a waste heat recovery chamber, a feed pipe at the top of the waste heat recovery chamber, a discharge port at the bottom of the waste heat recovery chamber, a lower control valve at the discharge port, a conical air inlet frame inside the waste heat recovery chamber, multiple air outlets on the bottom surface of the air inlet frame, an exhaust pipe at the top of the waste heat recovery chamber, the exhaust pipe being sleeved on the outside of the feed pipe, a hot air outlet on one side of the end of the exhaust pipe, and the hot air outlet being connected to a waste heat utilization device.

[0005] To further optimize this technical solution, the top of the air inlet frame is equipped with a conical air box, the top of the air box is equipped with a wear-resistant layer, the outer peripheral wall of the air box is an inverted cone, and multiple support boxes extend downwards from the outer peripheral wall of the air box. The ends of the multiple support boxes away from the air box are connected to an annular air duct. The air outlet includes an upper air outlet, a middle air outlet and a lower air outlet. The upper air outlet is located in the outer peripheral wall of the air box, the multiple middle air outlets are distributed in the bottom surface of the support boxes, and the lower air outlet is located at the bottom of the annular air duct. Air inlets are respectively provided at both ends of the annular air duct.

[0006] To further optimize this technical solution, the inner wall of the exhaust pipe is provided with multiple spiral air guide strips, which are set between the exhaust pipe and the feed pipe, and the hot air outlet is set on the tangential side of the exhaust pipe.

[0007] To further optimize this technical solution, blowers are installed at the two opposite air inlets, and dust removal devices and induced draft fans are connected in sequence at the hot air outlets. The positive pressure end of the induced draft fan is connected to the waste heat utilization device.

[0008] Compared with the prior art, this utility model has the following advantages: 1. It adopts a waste heat recovery chamber with an air inlet frame and an exhaust pipe inside, and works with a lower control valve to recover the sensible heat of the high-temperature sinter; 2. The high-temperature sinter exchanges heat with the low-temperature air blown in from the bottom in the waste heat recovery chamber in a countercurrent manner. Since the air outlets are evenly set at the bottom of each part of the air inlet frame, the low-temperature air can be blown evenly to the high-temperature sinter, and the sinter can effectively prevent the air outlets from being blocked. After being heated, the low-temperature air gathers at the top of the waste heat recovery chamber and is finally discharged into the waste heat utilization device through the exhaust pipe to recover the heat. The contact between the air inlet frame and the high-temperature sinter is more uniform, which further improves the heat exchange efficiency; 3. The exhaust pipe is sleeved on the outside of the feed pipe, which can further transfer the high temperature of the feed pipe to the hot air in the exhaust pipe. The guide strip can further make the hot air flow more evenly on the outer wall of the feed pipe, while increasing the contact area between the hot air and the feed pipe, thus improving the heat exchange efficiency. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the internal structure of a waste heat recovery chamber in a sinter cooling waste heat recovery system. Figure 2 This is a schematic diagram of the air inlet frame in the waste heat recovery chamber. Figure 3 This is a schematic diagram of a waste heat recovery system for sintered ore cooling. Figure 4 This is a cross-sectional view of the exhaust pipe in the feed pipe location.

[0010] In the diagram: 1. Waste heat recovery chamber; 11. Discharge port; 110. Lower control valve; 10. Feed pipe; 100. Upper control valve; 2. Air inlet frame; 20. Air box; 201. Wear-resistant layer; 202. Upper air outlet; 21. Support box; 210. Middle air outlet; 22. Annular air duct; 220. Lower air outlet; 23. Air inlet; 3. Exhaust pipe; 30. Air guide strip; 31. Hot air outlet; 32. Exhaust port; 5. Blower; 6. Dust removal device; 7. Exhaust fan; 8. Waste heat utilization device. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0012] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" used in this application to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing this disclosure and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0013] Combination Figures 1 to 4 As shown, a sintered ore cooling waste heat recovery system includes a waste heat recovery chamber 1, a dust removal device 6, an induced draft fan 7, a waste heat utilization device 8, and a blower 5.

[0014] Combination Figure 1 As shown, the waste heat recovery chamber 1 has a feed pipe 10 at the top, an upper control valve 100 at the upper part of the feed pipe 10, and the feed pipe 10 is connected to the discharge end of the sintering machine. The waste heat recovery chamber 1 has a discharge port 11 at the bottom, and a lower control valve 110 at the discharge port 11. The waste heat recovery chamber 1 has a conical air inlet frame 2, and the bottom surface of the air inlet frame 2 has multiple air outlets. The waste heat recovery chamber 1 has an exhaust pipe 3 at the top, which is sleeved on the outside of the feed pipe 10. A hot air outlet 31 is located on one side of the end of the exhaust pipe 3, and the hot air outlet 31 is located on the tangential side of the exhaust pipe 3. Figure 4 As shown, the inner wall of the exhaust pipe 3 is provided with multiple spiral air guide strips 30. The air guide strips 30 are arranged between the exhaust pipe 3 and the feed pipe 10. The outer wall of the lower side of the exhaust pipe 3 is provided with multiple exhaust holes 32, which are used to guide the hot air in the waste heat recovery chamber 1 into the exhaust pipe 3 and discharge it through the hot air outlet 31.

[0015] Hot air outlet 31 is connected to waste heat recovery device 8.

[0016] Combination Figures 1 to 2 As shown, the top of the air inlet frame 2 is provided with a conical air box 20, the top of the air box 20 is provided with a wear-resistant layer 201, the outer peripheral wall of the air box 20 is an inverted cone, and multiple support boxes 21 extend downwards from the outer peripheral wall of the air box 20. The ends of the multiple support boxes 21 away from the air box 20 are connected to an annular air duct 22. The air outlet includes an upper air outlet 202, a middle air outlet 210 and a lower air outlet 220. The upper air outlet 202 is located in the outer peripheral wall of the air box 20, the multiple middle air outlets 210 are distributed in the bottom surface of the support boxes 21, and the lower air outlet 220 is located at the bottom of the annular air duct 22. The radial ends of the annular air duct 22 are respectively provided with air inlets 23.

[0017] Combination Figure 3As shown, there are blowers 5 at the two opposite air inlets 23, and the hot air outlet 31 is connected in sequence to a dust removal device 6, an induced draft fan 7 and a waste heat utilization device 8.

[0018] When using, combine Figures 1 to 3 As shown, high-temperature sinter at approximately 700℃ enters the waste heat recovery chamber 1 for cooling via the feed pipe 10 and the upper control valve 100. The feed rate of the high-temperature sinter is regulated by the lower control valve 110 and the upper control valve 100. Low-temperature air is blown into the air intake frame 2 by two opposing blowers 5. The air is then blown towards the surrounding sinter through the air outlets. The high-temperature sinter exchanges heat counter-currently with the low-temperature air blown in from the bottom within the waste heat recovery chamber 1. Because the air outlets are evenly distributed at the bottom of various parts of the air intake frame 2... The system can evenly blow low-temperature air onto the high-temperature sintered ore, effectively preventing the sintered ore from clogging the air outlet. After being heated, the low-temperature air gathers at the top of the waste heat recovery chamber 1 and enters the exhaust pipe 3 through the exhaust port 32. Since the exhaust pipe 3 is sleeved outside the feed pipe 10, the high temperature of the feed pipe 10 can be further transferred to the hot air in the exhaust pipe 3. The guide strip 30 can further make the hot air flow more evenly on the outer wall of the feed pipe 10, while increasing the contact area between the hot air and the feed pipe 10 and improving the heat exchange efficiency. Finally, the hot air is heated to about 630°C and enters the waste heat utilization device 8 through the dust removal device 6 and the induced draft fan 7. The dust removal device 6 can be a cyclone dust removal device. The negative pressure end of the induced draft fan 7 is connected to one end of the dust removal device 6, and the other end of the dust removal device 6 is connected to the hot air outlet 31. The induced draft fan 7 provides a negative pressure environment for the dust removal device 6 and the hot air outlet 31. The positive pressure end of the induced draft fan 7 is connected to the waste heat recovery device 8, which is a heat exchange device that can remove the heat from the dust-removed hot air for use in preheating raw materials or fuels, or for power generation and heating. The hot air that releases heat through the waste heat recovery device 8 is cooled to below 100°C and then circulated back into the air inlet of the blower 5 to re-enter the waste heat recovery chamber 1 for heat exchange.

[0019] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A sintered ore cooling waste heat recovery system, comprising a waste heat recovery chamber (1), characterized in that: The waste heat recovery chamber (1) is provided with a feed pipe (10) at the top and a discharge port (11) at the bottom. A lower control valve (110) is provided at the discharge port (11). A conical air inlet frame (2) is provided inside the waste heat recovery chamber (1). Multiple air outlets are provided on the bottom surface of the air inlet frame (2). An exhaust pipe (3) is provided at the top of the waste heat recovery chamber (1). The exhaust pipe (3) is sleeved on the outside of the feed pipe (10). A hot air outlet (31) is provided on one side of the end of the exhaust pipe (3). The hot air outlet (31) is connected to the waste heat utilization device (8).

2. The sinter cooling waste heat recovery system according to claim 1, characterized in that: The top of the air inlet frame (2) is provided with a conical air box (20), the top of the air box (20) is provided with a wear-resistant layer (201), the outer peripheral wall of the air box (20) is an inverted cone, and multiple support boxes (21) extend downward around the outer peripheral wall of the air box (20). The ends of the multiple support boxes (21) away from the air box (20) are connected to an annular air duct (22). The air outlet includes an upper air outlet (202), a middle air outlet (210) and a lower air outlet (220). The upper air outlet (202) is located in the outer peripheral wall of the air box (20), the multiple middle air outlets (210) are distributed in the bottom surface of the support box (21), and the lower air outlet (220) is located at the bottom of the annular air duct (22). The radial ends of the annular air duct (22) are respectively provided with air inlets (23).

3. The sintered ore cooling waste heat recovery system according to claim 1, characterized in that: The inner wall of the exhaust pipe (3) is provided with a plurality of spiral air guide strips (30), the air guide strips (30) are arranged between the exhaust pipe (3) and the feed pipe (10), and the hot air port (31) is arranged on the tangential side of the exhaust pipe (3).

4. The sintered ore cooling waste heat recovery system according to claim 2, characterized in that: Two opposing air inlets (23) are respectively equipped with blowers (5), and the hot air outlet (31) is connected in sequence to a dust removal device (6) and an induced draft fan (7). The positive pressure end of the induced draft fan (7) is connected to the waste heat utilization device (8).

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