Flue gas waste heat recovery device

Abstract

The utility model relates to the technical field of chemical equipment, in particular to a flue gas waste heat recovery device which comprises a box body, a pump body is installed on one side of the box body, spray heads are symmetrically installed at the top end in the box body, and a driving assembly used for driving the spray heads to reciprocate and rotate is installed at the top of the box body. A smoke input pipe is fixedly connected to the bottom of one side of the box body, a smoke output pipe is fixedly connected to the top of the other side of the box body, a backflow pipe is installed between the smoke input pipe and the smoke output pipe, and a thermal expansion assembly used for controlling the backflow pipe to be opened and closed is installed in the smoke output pipe. According to the flue gas waste heat recovery device provided by the utility model, the spray head reciprocates and rotates through the driving assembly, so that heat exchange is enhanced; the thermal expansion assembly intelligently controls the backflow pipe through the smoke temperature, it is ensured that the smoke exhaust temperature is reasonable, and the device has the advantages of being high in waste heat recovery efficiency and accurate in temperature control.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a flue gas waste heat recovery device. Background Art

[0002] During industrial production and energy utilization, many devices emit large amounts of high-temperature flue gas, which contains considerable heat. Flue gas waste heat recovery is a process that uses specific technical means to collect and utilize this heat that was originally emitted directly into the atmosphere. Its role is very significant. On the one hand, it can greatly improve energy utilization efficiency and convert the originally wasted heat into usable energy for preheating materials, generating hot water or steam, etc., thereby reducing energy consumption in the production process; on the other hand, it can reduce the thermal pollution of high-temperature flue gas to the environment, reduce greenhouse gas emissions, help achieve energy conservation and emission reduction goals, and is of great significance to sustainable development.

[0003] The working principle of common flue gas waste heat recovery devices (such as spray-type flue gas waste heat recovery devices) is as follows: high-temperature flue gas enters from one side of the device, and a fixed-position spray head is installed inside to spray a cooling liquid (such as water) onto the flue gas flowing through. During this process, the high-temperature flue gas and the sprayed cooling liquid exchange heat, and heat is transferred from the flue gas to the liquid, thereby reducing the flue gas temperature and realizing waste heat recovery. The cooled flue gas is discharged from the other side of the device, and the liquid that has absorbed the heat can be further used in other links that require heat energy.

[0004] However, the existing spray-type waste heat recovery device has many shortcomings. In terms of heat exchange efficiency, its spray head is fixed, and the coverage range and spray angle of the cooling liquid are limited, resulting in insufficient heat transfer and low heat exchange efficiency. Moreover, it is difficult for the fixed spray head to form complex convection, which is not conducive to accelerating heat transfer, making it impossible to effectively recover a large amount of waste heat. From the perspective of temperature control, the existing device lacks a temperature control mechanism. When the output flue gas temperature is higher than the expected temperature, it is impossible to block the flue gas output channel and open the return pipe in time to allow the high-temperature flue gas to reflux for heat exchange again, resulting in unstable exhaust flue gas temperature, affecting subsequent equipment operation and energy utilization efficiency.

[0005] Therefore, it is necessary to provide a new flue gas waste heat recovery device to solve the above technical problems. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a flue gas waste heat recovery device.

[0007] The flue gas waste heat recovery device provided by the utility model includes: a box body, a pump body is installed on one side of the box body, an explosion-proof door is fixedly connected to one side of the box body, nozzles are symmetrically installed on the top of the inside of the box body, a driving component for driving the nozzles to reciprocate and rotate is installed on the top of the box body, a flue gas input pipe is fixedly connected to the bottom of one side of the box body, a flue gas output pipe is fixedly connected to the top of the other side of the box body, a return pipe is installed between the flue gas input pipe and the flue gas output pipe, and a thermal expansion component for controlling the return pipe switch is installed inside the flue gas output pipe.

[0008] Preferably, the driving assembly includes: a reciprocating screw, a slider, a gear, a rack, a driven bevel gear and an active bevel gear. The reciprocating screw is rotatably connected to the internal top of the box body, the outer wall of the reciprocating screw is threadedly connected to the slider, both ends of the slider are rotatably connected to the nozzle, the outer walls of the nozzle are fixedly connected to the gear, the internal top of the box body is symmetrically fixedly connected to the rack, the rack is meshed with the gear, one end of the reciprocating screw is fixedly connected to the driven bevel gear, the internal rotation of the box body is connected to the active bevel gear, and the active bevel gear is meshed with the driven bevel gear.

[0009] Preferably, the expansion assembly includes: a fixed block, an expansion body, a baffle, a connecting rod and a rubber plug. The inner wall of the smoke output pipe is fixedly connected to the fixed block, one end of the fixed block is fixedly connected to the expansion body, the inner wall of the smoke output pipe is rotatably connected to the baffle, one side of the fixed block is fixedly connected to the connecting rod, the end of the connecting rod is fixedly connected to the rubber plug, and the rubber plug is inserted into the return pipe near one end of the smoke output pipe.

[0010] Preferably, a motor is fixedly connected to the top of the box, and an output end of the motor is fixed to the active bevel gear.

[0011] Preferably, a guide rod is fixedly connected to the interior of the box above the reciprocating screw rod.

[0012] Preferably, one end of the baffle is in contact with the fixing block, and a gap is left between the baffle and the expansion body.

[0013] Preferably, a sliding groove is provided at one end of the baffle, and the connecting rod slides in the sliding groove.

[0014] Preferably, both ends of the return pipe are fixedly connected with a one-way valve.

[0015] Preferably, the input end of the pump body is connected to the box body through a pipe, and the output end of the pump body is fixedly connected to a three-way pipe. The two output ends of the three-way pipe are respectively connected to the corresponding nozzles through corrugated hoses. The nozzle is rotatably connected to the corrugated hose, and the corrugated hose is fixedly connected to the slider.

[0016] Compared with related technologies, the flue gas waste heat recovery device provided by the present invention has the following beneficial effects:

[0017] Improve waste heat recovery efficiency:

[0018] The device uses a drive component, that is, a motor that drives the active bevel gear, which in turn drives the driven bevel gear and reciprocating screw, allowing the slider to drive the nozzle to achieve reciprocating linear motion. At the same time, the gear on the outer wall of the nozzle engages with the rack to achieve self-rotation. This unique movement mode allows the cooling medium sprayed by the nozzle to cover the box space in all directions and at multiple angles, greatly increasing the contact area with the flue gas, promoting more complete heat transfer from the flue gas to the cooling medium, significantly improving the heat exchange efficiency, and allowing more flue gas waste heat to be recycled.

[0019] The reciprocating rotation of the nozzle causes the cooling medium to form a complex and orderly flow state in the box, forming a strong convection effect with the flue gas. Compared with the traditional static or simple flow heat exchange process, this enhanced convection greatly accelerates the heat transfer rate, further improves the waste heat recovery efficiency, and reduces energy waste;

[0020] Precise temperature control ensures output flue gas quality:

[0021] The expansion body in the thermal expansion assembly is extremely sensitive to flue gas temperature. When the flue gas temperature in the flue gas outlet pipe exceeds the preset value, the expansion body expands rapidly, squeezing the baffle, increasing the angle between the baffle and the flue gas outlet pipe, partially blocking the flue gas outlet pipe. At the same time, the return pipe is opened, guiding some of the high-temperature flue gas back to the box for reheating. This intelligent adjustment mechanism ensures that the flue gas temperature of the exhaust device is always within the preset reasonable range, ensuring the stability of the waste heat recovery process and the reliability of the output flue gas quality.

[0022] Precise temperature control avoids the adverse effects of excessively high flue gas temperatures on subsequent equipment or processes, creating a stable working environment for the entire production process, helping to improve production efficiency and reduce equipment failures and product quality issues caused by temperature fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of the flue gas waste heat recovery device provided by the utility model;

[0024] Figure 2 for Figure 1 The back structural diagram of the flue gas waste heat recovery device shown;

[0025] Figure 3 for Figure 1 Schematic diagram of the internal structure of the top of the box shown;

[0026] Figure 4 for Figure 3 The schematic diagram of the structure of the rack shown;

[0027] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure of the flue gas output pipe shown;

[0028] Figure 6 for Figure 5 Schematic diagram of the structure of the other side of the baffle is shown.

[0029] Numbers in the figure: 1. Box body; 2. Pump body; 3. Nozzle; 4. Smoke inlet pipe; 5. Smoke outlet pipe; 6. Return pipe; 7. Reciprocating screw; 8. Slider; 9. Gear; 10. Rack; 11. Driven bevel gear; 12. Driving bevel gear; 13. Fixed block; 14. Expansion body; 15. Baffle; 16. Connecting rod; 17. Rubber plug; 18. Motor; 19. Guide rod; 20. Slide; 21. Explosion-proof door. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0032] See also Figures 1 to 6 The vent 21 of the vent 21 is fixedly connected to the vent 21 of the vent 21, and the top of the vent 21 is symmetrically connected to the top of the vent 21. The top of the vent 21 is symmetrically connected to the top of the vent 21. The top of the vent 21 is symmetrically connected to the top of the vent 21. The top of the vent 21 is symmetrically connected to the top of the vent 21. The bottom of the vent 21 is fixedly connected to the bottom of the vent 21. The top of the vent 21 is fixedly connected to the top of the vent 21. The top of the vent 21 is fixedly connected to the top of the vent 21. The bottom of the vent 21 is fixedly connected to the bottom of the vent 21. The top of the vent 21 is fixedly connected to the top of the vent 21.

[0033] It should be noted that: both ends of the return pipe 6 are fixedly connected with a one-way valve to ensure that the smoke can only flow from the smoke output pipe 5 to the return pipe 6, and from the return pipe 6 back to the smoke input pipe 4;

[0034] See also Figure 3 and Figure 4, the driving assembly includes: a reciprocating screw 7, a slider 8, a gear 9, a rack 10, a driven bevel gear 11 and a driving bevel gear 12. The reciprocating screw 7 is rotatably connected to the internal top of the box body 1, and the slider 8 is threadedly connected to the outer wall of the reciprocating screw 7. Both ends of the slider 8 are rotatably connected to the nozzle 3. The outer walls of the nozzle 3 are fixedly connected to the gear 9. The rack 10 is symmetrically fixedly connected to the internal top of the box body 1. The rack 10 meshes with the gear 9. One end of the reciprocating screw 7 is fixedly connected to the driven bevel gear 11. The internal rotation of the box body 1 is connected to the driving bevel gear 12. The driving bevel gear 12 meshes with the driven bevel gear 11. The top of the box body 1 is fixedly connected to the motor 18. The output end of the motor 18 is fixed to the driving bevel gear 12. The interior of the box body 1 is fixedly connected to a guide rod 19 located above the reciprocating screw 7.

[0035] It should be noted that the guide rod 19 is used in conjunction with the reciprocating screw rod 7 so that the slider 8 can only slide along the axial direction of the guide rod 19 and cannot rotate with the rotation of the reciprocating screw rod 7;

[0036] See also Figure 5 and Figure 6 The expansion assembly includes: a fixed block 13, an expansion body 14, a baffle 15, a connecting rod 16 and a rubber plug 17. The inner wall of the smoke output pipe 5 is fixedly connected with the fixed block 13, one end of the fixed block 13 is fixedly connected with the expansion body 14, the inner wall of the smoke output pipe 5 is rotatably connected with the baffle 15, one side of the fixed block 13 is fixedly connected with the connecting rod 16, the end of the connecting rod 16 is fixedly connected with the rubber plug 17, the rubber plug 17 is inserted into the end of the return pipe 6 close to the smoke output pipe 5, one end of the baffle 15 is in contact with the fixed block 13, and a gap is left between the baffle 15 and the expansion body 14. A slide groove 20 is opened at one end of the baffle 15, and the connecting rod 16 slides in the slide groove 20;

[0037] It should be noted that: the expansion body 14 expands when heated. When the smoke temperature of the smoke output pipe 5 is higher than the preset temperature, the expansion body 14 will expand, and the end of the expansion body 14 will squeeze the baffle 15, so that the baffle 15 gradually becomes perpendicular to the axis of the smoke output pipe 5. The expansion body 14 cooperates with the baffle 15 to increase the angle between the baffle 15 and the smoke output pipe 5, thereby blocking part of the smoke output pipe 5. At the same time, during the expansion process, the expansion body 14 will drive the rubber plug 17 to move through the connecting rod 16, open the reflux pipe 6, and allow the smoke to flow into the reflux pipe 6.

[0038] The working principle of the flue gas waste heat recovery device provided by the utility model is as follows:

[0039] Flue gas input and heat exchange preparation:

[0040] Flue gas flows into the box body 1 from the flue gas inlet pipe 4 at the bottom of one side of the box body 1. At the same time, the pump body 2 starts to extract the cooling medium (such as circulating water) from the bottom of the box body 1, and transports the cooling medium to the nozzle 3 symmetrically installed at the top of the box body 1 through the three-way pipe and corrugated hose connected to its output end, providing cooling medium for the heat exchange process.

[0041] Nozzle 3 movement enhances heat exchange:

[0042] The motor 18 installed on the top of the box body 1 is started, and the output end of the motor 18 drives the active bevel gear 12 to rotate. The active bevel gear 12 is engaged with the driven bevel gear 11, and then drives the reciprocating screw 7 to rotate. Since the slider 8 is threadedly connected to the reciprocating screw 7, and the guide rod 19 fixedly connected above the reciprocating screw 7 inside the box body 1 limits the slider 8 to only slide in the axial direction, when the reciprocating screw 7 rotates, the slider 8 will perform reciprocating linear motion on the reciprocating screw 7. The two ends of the slider 8 are rotatably connected to the nozzle 3. During the reciprocating motion of the slider 8, the nozzle 3 synchronously performs reciprocating linear motion;

[0043] At the same time, the gear 9 fixedly connected to the outer wall of the nozzle 3 is meshed with the rack 10 symmetrically fixedly connected to the top of the box body 1, so that the nozzle 3 rotates around its own axis while performing reciprocating linear motion. This reciprocating motion and rotation of the nozzle 3 can spray the cooling medium more evenly and comprehensively inside the box body 1, greatly increasing the contact area and contact time between the cooling medium and the flue gas, and strengthening the heat exchange process.

[0044] Smoke output and backflow control:

[0045] The flue gas after heat exchange flows to the flue gas outlet pipe 5 at the top of the other side of the box body 1. A thermal expansion assembly is installed inside the flue gas outlet pipe 5. When the flue gas temperature is lower than the preset temperature, the expansion body 14 in the thermal expansion assembly is in a normal state. At this time, the expansion body 14 will not squeeze the baffle 15. The baffle 15 is in a state that is not perpendicular to the axis of the flue gas outlet pipe 5 and will not block the flue gas outlet pipe 5. At the same time, the rubber plug 17 connected to the expansion body 14 by the connecting rod 16 blocks the end of the return pipe 6 close to the flue gas outlet pipe 5. The return pipe 6 is closed, and the flue gas is discharged from the device normally through the flue gas outlet pipe 5.

[0046] If the temperature of the flue gas in the flue gas output pipe 5 is higher than the preset temperature, it indicates that the flue gas has not been fully cooled. At this time, the expansion body 14 in the thermal expansion assembly expands due to the heat, and the end of the expansion body 14 squeezes the baffle 15, causing the baffle 15 to rotate and gradually become perpendicular to the axis of the flue gas output pipe 5. The expansion body 14 cooperates with the baffle 15 to increase the angle between the baffle 15 and the flue gas output pipe 5, thereby blocking part of the flue gas output pipe 5 and preventing part of the high-temperature flue gas from being directly discharged. During the expansion process of the expansion body 14, the expansion body 14 drives the rubber stopper 17 to move through the connecting rod 16, thereby opening the return pipe 6 and allowing the high-temperature flue gas to flow into the return pipe 6;

[0047] Both ends of the return pipe 6 are fixedly connected with a one-way valve to ensure that the smoke can only flow from the smoke output pipe 5 to the return pipe 6, and from the return pipe 6 back to the smoke input pipe 4, to prevent the smoke from flowing back and ensure the directionality and stability of the smoke flow in the device. The smoke flowing out of the return pipe 6 returns to the box 1 and exchanges heat with the cooling medium sprayed by the nozzle 3 again until the smoke temperature is reduced to meet the requirements, and then it is discharged from the device through the smoke output pipe 5;

[0048] Explosion-proof aspects:

[0049] When the flue gas temperature is high, the amount of gas entering the box body 1 from the flue gas inlet pipe 4 is reduced. In addition, the baffle 15 will not be completely perpendicular to the axis of the flue gas outlet pipe 5, thereby preventing the flue gas outlet pipe 5 from being completely blocked and causing an explosion. Finally, an explosion-proof door 21 is installed on the bottom side of the box body 1. The explosion-proof door 21 can release pressure at the moment of explosion, thereby preventing the furnace or flue from being ruptured, deformed, or other damage due to excessive internal pressure.

[0050] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A flue gas waste heat recovery device, characterized in that: include: A box body (1) is provided, a pump body (2) is installed on one side of the box body (1), an explosion-proof door (21) is fixedly connected to one side of the box body (1), a nozzle (3) is symmetrically installed on the top of the box body (1), a driving component for driving the nozzle (3) to reciprocate and rotate is installed on the top of the box body (1), a smoke inlet pipe (4) is fixedly connected to the bottom of one side of the box body (1), a smoke outlet pipe (5) is fixedly connected to the top of the other side of the box body (1), a return pipe (6) is installed between the smoke inlet pipe (4) and the smoke outlet pipe (5), and a thermal expansion component for controlling the switch of the return pipe (6) is installed inside the smoke outlet pipe (5).

2. The flue gas waste heat recovery device according to claim 1, characterized in that: The driving assembly comprises: a reciprocating screw (7), a slider (8), a gear (9), a rack (10), a driven cone wheel (11) and a driving cone wheel (12); the top of the housing (1) is internally connected to the reciprocating screw (7), the outer wall of the reciprocating screw (7) is threadedly connected to the slider (8), both ends of the slider (8) are respectively connected to the nozzle (3), the outer wall of the nozzle (3) is fixedly connected to the gear (9), the top of the housing (1) is internally symmetrically fixedly connected to the rack (10), the rack (10) is meshed with the gear (9), one end of the reciprocating screw (7) is fixedly connected to the driven cone wheel (11), the interior of the housing (1) is connected to the driving cone wheel (12), and the driving cone wheel (12) is meshed with the driven cone wheel (11).

3. The flue gas waste heat recovery device according to claim 1, characterized in that: The expansion assembly comprises: a fixed block (13), an expansion body (14), a baffle (15), a connecting rod (16) and a rubber plug (17); the inner wall of the smoke output pipe (5) is fixedly connected to the fixed block (13); one end of the fixed block (13) is fixedly connected to the expansion body (14); the inner wall of the smoke output pipe (5) is rotatably connected to the baffle (15); one side of the fixed block (13) is fixedly connected to the connecting rod (16); the end of the connecting rod (16) is fixedly connected to the rubber plug (17); the rubber plug (17) is inserted into the return pipe (6) at one end close to the smoke output pipe (5).

4. The flue gas waste heat recovery device according to claim 2, characterized in that: The top of the box body (1) is fixedly connected to a motor (18), and the output end of the motor (18) is fixed to the driving cone wheel (12).

5. The flue gas waste heat recovery device according to claim 2, characterized in that: A guide rod (19) is fixedly connected to the interior of the box (1) above the reciprocating screw rod (7).

6. The flue gas waste heat recovery device according to claim 3, characterized in that: One end of the baffle (15) contacts the fixed block (13), and a gap is left between the baffle (15) and the expansion body (14).

7. The flue gas waste heat recovery device according to claim 3, characterized in that: A sliding groove (20) is provided at one end of the baffle (15), and the connecting rod (16) slides in the sliding groove (20).

8. The flue gas waste heat recovery device according to claim 1, characterized in that: Both ends of the return pipe (6) are fixedly connected with a one-way valve.

9. The flue gas waste heat recovery device according to claim 1, characterized in that: The input end of the pump body (2) is connected to the box body (1) through a pipeline, and the output end of the pump body (2) is fixedly connected to a three-way pipe. The two output ends of the three-way pipe are respectively connected to the corresponding nozzles (3) through corrugated hoses. The nozzles (3) are rotatably connected to the corrugated hoses, and the corrugated hoses are fixedly connected to the slider (8).

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