A waste heat recovery device for a roasting furnace

Abstract

The present invention relates to the technical field of alumina production. The present invention discloses a waste heat recovery device for a roasting furnace, which comprises a flue gas fan, a heat exchange pipeline and an exhaust hood. A flue gas pipeline is arranged at the inlet of the flue gas fan and communicated with an external roasting furnace. The outlet of the flue gas fan is communicated with a plurality of heat exchange pipelines. The top ends of the heat exchange pipelines are jointly communicated with the exhaust hood. A flue gas outlet pipe is arranged at the top of the exhaust hood, and an outlet valve is arranged on the flue gas outlet pipe. It is characterized in that: a converging throat is arranged in the middle of the heat exchange pipeline, and a diffusor wall with horizontal displacement is arranged above the throat. The advantages of the present invention compared with the prior art are as follows: by performing heat exchange while pressurizing the flue gas flow, the water vapor contained in the flue gas can be liquefied and release heat, and its latent heat of vaporization can be fully released and absorbed. For the field to which the present invention is applied, the latent heat of vaporization can be used to heat mother liquor and flat plate washing water, saving the steam cost for heating flat plate washing water, reducing energy consumption and reducing emissions.

Description

Technical Field

[0001] The present invention relates to the technical field of alumina production, and specifically refers to a waste heat recovery device for a roasting furnace. Background Art

[0002] In current production, roasted aluminum hydroxide is roasted in a roasting furnace to remove the crystal water and attached water in the aluminum hydroxide, and to complete partial crystal form transformation to obtain the final alumina product. The exhaust gas temperature of the roasting furnace is about 135°C - 180°C, and the exhaust gas contains about 40% - 55% water vapor. Therefore, the discharged exhaust gas will carry away a large amount of sensible heat and latent heat. If this part of water and heat is not recovered and utilized, it will undoubtedly be a waste. At present, we use heat exchange with flat plate washing water. However, this method of waste heat recovery from flue gas only utilizes part of the sensible heat of the flue gas. For the flue gas of a furnace, the sensible heat of the flue gas only accounts for about 12% of the total heat of the flue gas, and about 88% of the heat is the latent heat of the water vapor in the flue gas, resulting in a large amount of flue gas heat being discharged.

[0003] In order to improve the heat utilization rate of the roasting furnace, reduce the flue gas temperature, reduce the consumption of new steam, and reduce the emission of greenhouse gas carbon dioxide, our company specifically proposes to research and develop a waste heat utilization device for the roasting furnace. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing flue gas heat exchanger for an aluminum hydroxide roasting furnace cannot fully absorb the latent heat of steam in the flue gas, and a waste heat recovery device for a roasting furnace is provided.

[0005] To solve the above technical problem, the technical solution provided by the present invention is: a waste heat recovery device for a roasting furnace, which includes a flue gas fan, a heat exchange pipeline and an exhaust hood. A flue gas pipeline is arranged at the inlet of the flue gas fan and is connected to an external roasting furnace. The outlet of the flue gas fan is connected to a plurality of heat exchange pipelines. The top ends of the heat exchange pipelines are jointly connected to the exhaust hood. A flue gas outlet pipe is arranged at the top of the exhaust hood, and an outlet valve is provided on the flue gas outlet pipe.

[0006] A converging throat is arranged in the middle of the heat exchange pipeline. The throat protrudes towards the outer wall surface of the heat exchange pipeline. A first sliding plate is hinged at the top of the throat. The first sliding plate is slidably connected to a second sliding plate. The end of the second sliding plate is hinged to a diffuser wall. The diffuser wall is horizontally slidably arranged in the heat exchange pipeline. The diffuser wall is vertically slidably connected to a third sliding plate. A plurality of heat pipe fin heat exchangers are hinged on the outer wall surface of the heat exchange pipeline. The other side of the heat pipe fin heat exchanger connected to the outer wall surface of the heat exchange pipeline is hingedly connected to the third sliding plate.

[0007] A bell-shaped cover is arranged inside the exhaust hood, and there is a gap between the inner wall of the exhaust hood and the bell-shaped cover. A plurality of mother liquor diversion boxes are arranged around the outer surface of the bell-shaped cover, and the plurality of mother liquor diversion boxes are evenly arranged. There is a flue gas channel between the mother liquor diversion boxes, and a plurality of evenly arranged mother liquor fins are arranged in the flue gas channel. A plurality of mother liquor heat exchange tubes are arranged between the plurality of mother liquor diversion boxes. The mother liquor heat exchange tubes extend in the horizontal direction and pass through the mother liquor fins. A plurality of inclined partition plates are arranged inside the mother liquor diversion boxes.

[0008] Furthermore, water guide tanks are arranged on both sides of the heat pipe fin heat exchanger. A connecting rod is arranged at the hinge joint between the heat pipe fin heat exchanger and the third sliding plate. The connecting rod fixedly connects the water guide tanks on both sides of the heat pipe fin heat exchanger. A connecting pipe is arranged at the hinge joint between the heat pipe fin heat exchanger and the outer side wall of the heat exchange pipeline. The connecting pipe communicates the water guide tanks on both sides of the heat pipe fin heat exchanger. The heat pipe fin heat exchanger is provided with a plurality of heat pipes, and the ends of the heat pipes extend into the water guide tanks.

[0009] Furthermore, a water pipe quick connector is arranged on the outer side of the end of the water guide tank connected to the connecting rod. The water pipe quick connector passes through the side wall of the heat exchange pipeline and extends to the outside.

[0010] Furthermore, a hot water inlet ring pipe and a hot water outlet ring pipe are arranged around the outer circumference of the plurality of heat exchange pipelines. The water pipe quick connector on one side of the heat pipe fin heat exchanger is connected to the hot water inlet ring pipe through a hose, and the water pipe quick connector on the other side is connected to the hot water outlet ring pipe through a hose.

[0011] Furthermore, a first water collecting tank is arranged below the hinge joint between the throat and the first sliding plate. A second water collecting tank is arranged inside the heat exchange pipeline near the hinge joint between the throat and the first sliding plate. A first condensate ring pipe is arranged around the outer circumference of the plurality of heat exchange pipelines, and a second condensate ring pipe is arranged around the inner circumference. The first water collecting tank is communicated with the second condensate ring pipe, and the second water collecting tank is communicated with the first condensate ring pipe.

[0012] Furthermore, a mother liquor inlet ring pipe is arranged around the top of the exhaust hood, and a mother liquor outlet ring pipe is arranged around the bottom. The top side of the mother liquor diversion box is connected to the mother liquor inlet ring pipe through a pipeline, and the outer side of the bottom of the mother liquor diversion box is connected to the mother liquor outlet ring pipe through a pipeline.

[0013] Furthermore, an axial flow impeller and a first motor for driving the axial flow impeller are arranged inside the flue gas fan.

[0014] Furthermore, a horizontal guide rail and a lead screw are arranged on the outer side of the throat. The diffusion pipe wall is horizontally slidably arranged on the guide rail and is driven by the lead screw. A second motor is arranged on the outer side of the throat to drive the lead screw.

[0015] Furthermore, a first dust-proof rubber sleeve is wrapped outside the hinge joint between the first sliding plate and the throat, and a second dust-proof rubber sleeve is wrapped outside the hinge joint between the second sliding plate and the diffusion pipe wall.

[0016] The advantages of the present invention compared with the prior art are that by increasing the pressure of the flue gas flow while exchanging heat, the water vapor contained in the flue gas can be liquefied to release heat, enabling the full release and absorption of its latent heat of vaporization. For the field to which the present invention is applied, the latent heat of vaporization can be used to heat the mother liquor and the pan washing water, saving the steam cost for heating the pan washing water, reducing energy consumption and emissions.

[0017] To achieve the above advantages, the present invention has the following structure:

[0018] The pressure of the flue gas is increased by reducing the flue gas flow rate through the opening degree of the flue gas outlet valve, and a corresponding mother liquor heat exchange structure is arranged in the exhaust hood. Since the heat absorption for increasing the pressure of the flue gas here liquefies the steam and further heats the mother liquor, it is beneficial to the subsequent evaporation of the mother liquor.

[0019] Through the pipe diameter adjustment mechanism of the heat exchange pipe, the cross-sectional area of the flue gas flow is increased according to the flue gas temperature to slow it down and increase the pressure, and a heat pipe fin heat exchanger is arranged here to further promote the liquefaction of the steam to release heat and heat the external hot feed water.

[0020] Since the pipe diameter of the heat exchange pipe is variable, the heat exchange structure arranged here cannot fully contact the flue gas flow with a common heat exchanger. The present invention provides a mechanism that can make the heat exchanger rotate following the change of the pipe diameter of the heat exchange pipe, so that the heat exchanger always maintains full contact with the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the present invention.

[0022] Figure 2 is a schematic sectional structural diagram of the present invention.

[0023] Figure 3 is a schematic sectional structural diagram of the heat exchange pipe of the present invention.

[0024] Figure 4 is a schematic structural diagram of the present invention after the pipe diameter of the heat exchange pipe is increased.

[0025] Figure 5 is a schematic structural diagram of the diffusion pipe wall of the present invention.

[0026] Figure 6 is a schematic structural diagram of the heat pipe fin heat exchanger of the present invention.

[0027] Figure 7 is a schematic sectional structural diagram of the water guide tank of the present invention.

[0028] Figure 8 is a schematic structural diagram of the exhaust hood of the present invention.

[0029] Figure 9 is a schematic structural diagram of the bottom of the exhaust hood of the present invention.

[0030] Figure 10 It is a schematic diagram of the internal structure of the exhaust hood of the present invention.

[0031] Figure 11 It is a schematic diagram of the internal structure of the mother liquor diversion box of the present invention.

[0032] Figure 12 It is a schematic diagram of the structure of the mother liquor inlet ring pipe of the present invention.

[0033] Figure 13 It is an attachment Figure 12 Schematic diagram of the structure at position a in

[0034] As shown in the figure: 1. Flue gas fan; 2. Flue gas pipeline; 3. Heat exchange pipeline; 4. Hot water inlet ring pipe; 5. Hot water outlet ring pipe; 6. First condensate ring pipe; 7. Exhaust hood; 8. Flue gas outlet pipe; 9. Outlet valve; 10. Mother liquor inlet ring pipe; 11. Mother liquor outlet ring pipe; 12. Axial flow impeller; 13. First motor; 14. Second condensate ring pipe; 15. Throat; 16. First sliding plate; 17. Diffuser wall; 18. Heat pipe fin heat exchanger; 19. Bell-shaped cover; 20. Flue gas channel; 21. Mother liquor fin; 22. First water collecting tank; 23. Second water collecting tank; 24. First dust-proof rubber sleeve; 25. Second dust-proof rubber sleeve; 26. Guide rail; 27. Lead screw; 28. Second motor; 29. Second sliding plate; 30. Third sliding plate; 31. Water guiding tank; 32. Heat pipe; 33. Water pipe quick connector; 34. Connecting rod; 35. Connecting pipe; 36. Mother liquor heat exchange pipe; 37. Mother liquor diversion box; 38. Partition board. Detailed implementation mode

[0035] The present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Combined with the attached Figure 1 And the attached Figure 2 , a waste heat recovery device for a roasting furnace, which includes a flue gas fan 1, a heat exchange pipeline 3 and an exhaust hood 7. A flue gas pipeline 2 is arranged at the inlet of the flue gas fan 1 and is connected to an external roasting furnace. The outlet of the flue gas fan 1 is connected to a plurality of heat exchange pipelines 3. The top ends of the heat exchange pipelines 3 are jointly connected to the exhaust hood 7. A flue gas outlet pipe 8 is arranged at the top of the exhaust hood 7, and an outlet valve 9 is arranged on the flue gas outlet pipe 8.

[0037] An axial flow impeller 12 and a first motor 13 for driving the axial flow impeller 12 are arranged inside the flue gas fan 1. After the gas in the roasting furnace is sucked into the flue gas fan 1, it is discharged upward and enters the heat exchange pipeline 3. Temperature sensors and pressure sensors are arranged on the inner side of the top of the heat exchange pipeline 3 and inside the exhaust hood 7.

[0038] Combined with the attached Figure 2 、the attached Figure 3 And the attached Figure 4, a converging throat 15 is provided in the middle of the heat exchange pipe 3. A first sliding plate 16 is hinged at the top of the throat 15. The first sliding plate 16 is slidably connected to a second sliding plate 29. The end of the second sliding plate 29 is hinged to a diffuser wall 17. The diffuser wall 17 is horizontally slidably arranged in the heat exchange pipe 3. The diffuser wall 17 is vertically slidably connected to a third sliding plate 30. A plurality of heat pipe fin heat exchangers 18 are hinged to the outer wall surface of the heat exchange pipe 3. The other side of the heat pipe fin heat exchanger 18 connected to the outer wall surface of the heat exchange pipe 3 is hinged to the third sliding plate 30.

[0039] Combined with the attached Figure 5 , a horizontal guide rail 26 and a lead screw 27 are provided outside the throat 15. The diffuser wall 17 is horizontally slidably arranged on the guide rail 26 and is driven by the lead screw 27. A second motor 28 is provided outside the throat 15 to drive the lead screw 27.

[0040] The above structure drives the lead screw 27 by the second motor 28 to horizontally displace the diffuser wall 17. When the diffuser wall 17 moves away from the side wall of the heat exchange pipe 3, the cross-sectional area of the flow channel formed by the two increases. During this process, the first sliding plate 16 and the second sliding plate 29 slide relative to each other, maintaining the integrity of the wall surface of the flow channel between the top of the throat 15 and the bottom of the diffuser wall 17.

[0041] When the diffuser wall 17 slides horizontally, the third sliding plate 30 is vertically slid on the diffuser wall 17 under the traction of the diffuser wall 17 and the heat pipe fin heat exchanger 18. During the movement of the third sliding plate 30, the included angle between the heat pipe fin heat exchanger 18 and the flow channel is constantly changing. During the process of the continuous change of the cross-sectional area of the flow channel, the heat pipe fin heat exchanger 18 can always fill the flow cross-section, ensuring full contact with the flue gas flow.

[0042] An outer part of the hinge between the first sliding plate 16 and the throat 15 is wrapped with a first dust-proof rubber sleeve 24. An outer part of the hinge between the second sliding plate 29 and the diffuser wall 17 is wrapped with a second dust-proof rubber sleeve 25.

[0043] Corresponding pressure-resistant and heat-resistant sealing treatments are provided on the contact parts between the first sliding plate 16, the second sliding plate 29, the third sliding plate 30 and both sides of the diffuser wall 17 and the inner wall of the heat exchange pipe 3. Such technologies are relatively conventional and will not be further described in this application.

[0044] Combined with the attached Figure 6 and the attached Figure 7, there are water guide tanks 31 on both sides of the heat pipe fin heat exchanger 18. A connecting rod 34 is provided at the hinged joint of the heat pipe fin heat exchanger 18 and the third sliding plate 30. The connecting rod 34 fixedly connects the water guide tanks 31 on both sides of the heat pipe fin heat exchanger 18. A connecting pipe 35 is provided at the hinged joint of the heat pipe fin heat exchanger 18 and the outer wall surface of the heat exchange pipe 3. The connecting pipe 35 communicates the water guide tanks 31 on both sides of the heat pipe fin heat exchanger 18. The heat pipe fin heat exchanger 18 is provided with a plurality of heat pipes 32, and the ends of the heat pipes 32 extend into the water guide tank 31.

[0045] Combined with the attached Figure 1 and the attached Figure 7 On the outside of one end of the water guide tank 31 connected to the connecting rod 34, there is a water pipe quick connector 33, and the water pipe quick connector 33 passes through the side wall of the heat exchange pipe 3 and extends to the outside.

[0046] Since the heat pipe fin heat exchanger 18 needs to rotate following the sliding of the diffusion pipe wall 17, its structure cannot be too complex and the heat exchange scale limit is relatively low. In order to provide good heat exchange capacity, the present invention selects heat pipes to transfer the heat of the flue gas to the hot water for heat exchange. After the heat exchange, the working fluid in the heat pipe 32 is vaporized, and the vaporized working fluid exchanges heat with the feed water in the water guide tank 31 in the condensation section. After the working fluid condenses and releases heat, it becomes a liquid again. This cycle continues the above process, so that the heat source of the flue gas continuously heats the feed water. Since the vapor-liquid two-phase in the heat pipe 32 is in a saturated equilibrium state, the heat pipe 32 wall has good isothermal property.

[0047] When the flue gas passes through the heat pipe fin heat exchanger 18, the heat pipe 32 absorbs the heat of the flue gas and transfers it into the water guide tank 31. After the hot water enters the water guide tank 31, it absorbs heat from the end of the heat pipe 32.

[0048] A plurality of heat pipe fin heat exchangers 18 are arranged in a substantially vertical direction. The water pipe quick connector 33 on one side of the uppermost heat pipe fin heat exchanger 18 is connected to the hot water inlet ring pipe 4 by a hose, and the other side is connected to the water pipe quick connector 33 on the same side of the lower heat pipe fin heat exchanger 18 by a hose. In this way, a plurality of heat pipe fin heat exchangers 18 are connected in series through hoses. The water pipe quick connector 33 of the lowermost heat pipe fin heat exchanger 18 that is not connected in series with the upper part is connected to the hot water outlet ring pipe 5 by a hose.

[0049] Combined with the attached Figure 2 and the attached Figure 3 A first water collecting tank 22 is arranged below the hinged joint of the throat 15 and the first sliding plate 16. A second water collecting tank 23 is arranged inside the heat exchange pipe 3 near the hinged joint of the throat 15 and the first sliding plate 16. A first condensate ring pipe 6 is arranged around the outer circumference of a plurality of heat exchange pipes 3, and a second condensate ring pipe 14 is arranged around the inner circumference. The first water collecting tank 22 is communicated with the second condensate ring pipe 14, and the second water collecting tank 23 is communicated with the first condensate ring pipe 6.

[0050] Since the flow cross-sectional area formed at the diffusion tube wall 17 increases and a heat pipe fin heat exchanger 18 is provided for heat absorption, when the flow rate provided by the flue gas fan 1 is constant, the flue gas velocity decreases due to the increase in the flow cross-sectional area here, resulting in an increase in the flue gas pressure. The water vapor in the flue gas condenses into liquid water and falls due to the increase in pressure and the decrease in temperature. The first water collecting tank 22 and the second water collecting tank 23 can collect the condensed water and discharge it outward. If the condensed water enters the flow channel below the throat 15, it will re-absorb heat from the flue gas and vaporize, reducing the flue gas temperature and increasing the steam content. After this part of the flue gas contacts the heat pipe fin heat exchanger 18, the heat transfer efficiency of the heat pipe fin heat exchanger 18 is reduced. The drainage rates of the first water collecting tank 22 and the second water collecting tank 23 should be set according to the heat transfer performance of the heat pipe fin heat exchanger 18 of the actual device.

[0051] Combined with attached Figure 2 attachment Figure 8 attachment Figure 9 attachment Figure 10 and attachment Figure 11 In attachment

[0052] Combined with attached Figure 12 attachment Figure 13 and attachment

[0053] Taking attached Figure 11 attachment Figure 13 and attachment

[0054] The mother liquor enters the exhaust hood 7 through the mother liquor inlet ring pipe 10 and is guided by the partition plate 38 in the mother liquor diversion box 37 to sequentially enter each layer of the mother liquor heat exchange tubes 36 from top to bottom and then converges to the mother liquor outlet ring pipe 11 for discharge.

[0055] In the present invention, by decelerating and pressurizing the flue gas and combining with external heat absorption, while absorbing the heat of the flue gas, the water vapor is pressurized and cooled to be liquefied. During the steam liquefaction process, phase change heat is released, and the latent heat of the flue gas steam is released.

[0056] Generally, the pressure can be increased by restricting the velocity of the hot fluid in the device through a valve. In this regard, the present invention can be achieved through the outlet valve 9 provided on the flue gas outlet pipe 8. By restricting the opening degree of the outlet valve 9, the pressure inside the exhaust hood 7 is increased. A heat exchanger structure is added here and the mother liquor required for roasting aluminum hydroxide in the furnace is introduced for heat absorption. The flue gas is pressurized and cooled here, where the steam liquefies and releases heat, and the mother liquor absorbs heat and then is sent to the evaporation equipment for subsequent treatment.

[0057] In addition, under the condition of maintaining a certain flue gas flow rate, the deceleration and pressurization can be achieved by increasing the cross-sectional area of the flue gas flow. In this regard, the diffusion pipe wall 17 in the upper half of the heat exchange pipe 3 of the present invention can electrically adjust the distance from the side wall of the heat exchange pipe 3 to change the cross-sectional area of the flue gas flow, and a heat pipe fin heat exchanger 18 is also provided here to cool the flue gas. In order to ensure that the heat pipe fin heat exchanger 18 can fully contact the flue gas, the heat pipe fin heat exchanger 18 is installed in the heat exchange pipe 3 in a hinged form, and a linkage traction device is provided to make it rotate synchronously when the diffusion pipe wall 17 moves, ensuring full contact with the flue gas.

[0058] Since the generation amount of the flue gas of the roasting furnace is not fixed, in order to ensure that the device has good working efficiency, temperature sensors and pressure sensors are provided inside the top of the heat exchange pipe 3 and inside the exhaust hood 7. The first motor 13 also selects a model with frequency conversion or speed regulation function, so that the opening degree of the outlet valve 9, the rotation speed of the flue gas fan 1, and the number of rotation circles of the second motor 28 are linked according to the temperature and pressure inside the device, ensuring that the pressure inside the device is slightly higher than the liquefaction pressure of water at the flue gas temperature. It is also possible to link the external hot water input and the flow rate of the mother liquor input according to the pressure inside the device to make the temperature lower than the liquefaction temperature at the corresponding pressure.

[0059] The present invention and its implementation manners have been described above. This description is not restrictive, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and without departing from the gist of the present invention, without creative design, they design a structural manner and an embodiment similar to the technical solution, which should fall within the protection scope of the present invention.

Claims

1. A roasting furnace waste heat recovery device, comprising a flue gas fan (1), a heat exchange pipe (3) and an exhaust hood (7), wherein a flue gas pipe (2) is arranged at the inlet of the flue gas fan (1) and is connected to an external roasting furnace, and an outlet of the flue gas fan (1) is connected to a plurality of heat exchange pipes (3), and the top ends of the heat exchange pipes (3) are connected to the exhaust hood (7), and a flue gas outlet pipe (8) is arranged at the top of the exhaust hood (7), and the flue gas outlet pipe (8) is provided with an outlet valve (9), characterized in that: A convergent throat (15) is provided in the middle of the heat exchange pipe (3); a first sliding plate (16) is hingedly provided at the top of the throat (15); a second sliding plate (29) is slidably connected to the first sliding plate (16); a diffuser wall (17) is hingedly provided at the end of the second sliding plate (29); the diffuser wall (17) is horizontally slidably provided in the heat exchange pipe (3); the diffuser wall (17) is vertically slidably connected to a third sliding plate (30); the diffuser wall (17) translates to drive the first sliding plate (16) and the second sliding plate (29) to move horizontally. The sliding plate (29) pitches and swings, and at the same time, the first sliding plate (16) and the second sliding plate (29) slide relative to each other. The swinging of the second sliding plate (29) drives the third sliding plate (30) to slide vertically on the diffusion pipe wall (17). A plurality of heat pipe fin heat exchangers (18) are hingedly arranged on the outer wall of the heat exchange pipe (3). The other side of the heat pipe fin heat exchanger (18) is hingedly connected to the third sliding plate (30). The vertical sliding of the third sliding plate (30) drives the heat pipe fin heat exchanger (18) to pitch and swing; A bell-shaped hood (19) is arranged inside the exhaust hood (7), a gap is provided between the inner wall of the exhaust hood (7) and the bell-shaped hood (19), a plurality of mother liquid guide boxes (37) are arranged around the outer surface of the bell-shaped hood (19), the plurality of mother liquid guide boxes (37) are evenly arranged, a smoke channel (20) is provided between the mother liquid guide boxes (37), a plurality of evenly arranged mother liquid fins (21) are provided in the smoke channel (20), a plurality of mother liquid heat exchange tubes (36) are provided between the plurality of mother liquid guide boxes (37), the mother liquid heat exchange tubes (36) extend in a circumferential direction and pass through the mother liquid fins (21), and a plurality of inclined partition plates (38) are provided inside the mother liquid guide boxes (37).

2. The roasting furnace waste heat recovery device according to claim 1, characterized in that: A guide water tank (31) is provided on both sides of the heat pipe fin heat exchanger (18); a connecting rod (34) is provided at a hinged position between the heat pipe fin heat exchanger (18) and the third sliding plate (30); the connecting rod (34) fixedly connects the guide water tanks (31) on both sides of the heat pipe fin heat exchanger (18); a connecting pipe (35) is provided at a hinged position between the heat pipe fin heat exchanger (18) and the outer wall of the heat exchange pipe (3); the connecting pipe (35) connects the guide water tanks (31) on both sides of the heat pipe fin heat exchanger (18); the heat pipe fin heat exchanger (18) is provided with a plurality of heat pipes (32); the ends of the heat pipes (32) extend into the guide water tank (31).

3. The roasting furnace waste heat recovery device according to claim 2, characterized in that: A water pipe quick connector (33) is provided on the outer side of one end of the guide water tank (31) connected to the connecting rod (34), and the water pipe quick connector (33) passes through the side wall of the heat exchange pipe (3) and extends to the outside.

4. The roasting furnace waste heat recovery device according to claim 3, characterized in that: A hot water inlet ring pipe (4) and a hot water outlet ring pipe (5) are arranged around the outer sides of the plurality of heat exchange pipes (3); a water pipe quick connector (33) on one side of the heat pipe fin heat exchanger (18) is connected to the hot water inlet ring pipe (4) by a hose, and a water pipe quick connector (33) on the other side is connected to the hot water outlet ring pipe (5) by a hose.

5. The roasting furnace waste heat recovery device according to claim 1, characterized in that: A first water collecting trough (22) is arranged below the hinged joint between the throat (15) and the first sliding plate (16); a second water collecting trough (23) is arranged inside the heat exchange pipe (3) near the hinged joint between the throat (15) and the first sliding plate (16); a first condensate ring tube (6) is arranged around the outer side of the plurality of heat exchange pipes (3); a second condensate ring tube (14) is arranged around the inner side; the first water collecting trough (22) is connected to the second condensate ring tube (14); and the second water collecting trough (23) is connected to the first condensate ring tube (6).

6. The device for recovering waste heat from a roasting furnace according to claim 1, characterized in that: A mother liquid inlet annular pipe (10) is arranged around the top of the exhaust hood (7), and a mother liquid outlet annular pipe (11) is arranged around the bottom. A pipe is arranged on the top side of the mother liquid guide box (37) to communicate with the mother liquid inlet annular pipe (10), and a pipe is arranged on the bottom outer side of the mother liquid guide box (37) to communicate with the mother liquid outlet annular pipe (11).

7. The roasting furnace waste heat recovery device according to claim 1, characterized in that: An axial flow impeller (12) and a first motor (13) for driving the axial flow impeller (12) are arranged inside the flue gas fan (1).

8. The roasting furnace waste heat recovery device according to claim 1, characterized in that: A horizontal guide rail (26) and a lead screw (27) are arranged outside the throat (15); the diffuser wall (17) is horizontally slidably arranged on the guide rail (26) and driven by the lead screw (27); and a second motor (28) is arranged outside the throat (15) to drive the lead screw (27).

9. The roasting furnace waste heat recovery device according to claim 1, characterized in that: A first dustproof rubber sleeve (24) is wrapped around the outside of the hinged joint between the first sliding plate (16) and the throat (15), and a second dustproof rubber sleeve (25) is wrapped around the outside of the hinged joint between the second sliding plate (29) and the diffuser pipe wall (17).

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