Roasting furnace waste heat recovery device

Abstract

The invention relates to the technical field of aluminum oxide production, and discloses a roasting furnace waste heat recovery device which comprises a flue gas fan, heat exchange pipelines and an exhaust hood, a flue gas pipeline is arranged at an inlet of the flue gas fan and communicated with an external roasting furnace, an outlet of the flue gas fan is communicated with the multiple heat exchange pipelines, and the tail ends of the tops of the heat exchange pipelines are jointly communicated with the exhaust hood. The heat exchanger is characterized in that a convergent throat channel is arranged in the middle of the heat exchange pipeline, and a diffusion pipe wall capable of horizontally moving is arranged above the throat channel. Compared with the prior art, the device has the advantages that heat exchange is carried out while flue gas flow is pressurized, steam contained in flue gas can be liquefied to release heat, steam latent heat can be fully released and absorbed, in the field where the device is applied, the steam latent heat can be used for heating mother liquor and flat plate washing water, and the heat exchange efficiency is improved. The steam cost for heating flat plate washing water is saved, energy consumption is reduced, and emission is reduced.

Description

Technical Field

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

[0002] In current production, aluminum hydroxide is roasted in a roasting furnace to remove the crystal water and attached water in aluminum hydroxide, and to complete part of the crystal transformation to obtain the final alumina product. The exhaust gas temperature discharged from the roasting furnace is about 135℃-180℃, and the exhaust gas contains about 40%-55% water vapor. Therefore, the exhaust gas will take away a large amount of sensible heat and latent heat. If this part of water and heat is not recycled, it will undoubtedly be a waste. At present, we use the flat plate washing water for heat exchange. However, this flue gas waste heat recovery method only utilizes part of the sensible heat of the flue gas. For the furnace flue gas, 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 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 roaster, reduce the flue gas temperature, reduce the consumption of new steam, and reduce the emission of greenhouse gas carbon dioxide, our company has specially proposed to develop a device for utilizing waste heat from the roaster. Summary of the invention

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

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is: a roasting furnace waste heat recovery device, which includes a flue gas fan, a heat exchange pipe and an exhaust hood. A flue gas pipe is arranged at the inlet of the flue gas fan to connect with an external roasting furnace, and the outlet of the flue gas fan is connected with multiple heat exchange pipes. The top ends of the heat exchange pipes are commonly connected with the exhaust hood. A smoke outlet pipe is arranged on the top of the exhaust hood, and the smoke outlet pipe is provided with an outlet valve.

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

[0007] A bell-shaped cover is arranged inside the exhaust hood, and a gap is provided between the inner wall of the exhaust hood and the bell-shaped cover. A plurality of mother liquid guide boxes are arranged around the outer surface of the bell-shaped cover. The plurality of mother liquid guide boxes are evenly arranged. A smoke channel is provided between the mother liquid guide boxes. A plurality of evenly arranged mother liquid fins are provided in the smoke channel. A plurality of mother liquid heat exchange tubes are provided between the plurality of mother liquid guide boxes. The mother liquid heat exchange tubes extend horizontally and pass through the mother liquid fins. A plurality of inclined partition plates are provided inside the mother liquid guide box.

[0008] Furthermore, guide water tanks are provided on both sides of the heat pipe fin heat exchanger, and connecting rods are provided at the hinges between the heat pipe fin heat exchanger and the third sliding plate, which fixedly connect the guide water tanks on both sides of the heat pipe fin heat exchanger, and connecting pipes are provided at the hinges between the heat pipe fin heat exchanger and the outer wall of the heat exchange pipe, which connect the guide water tanks on both sides of the heat pipe fin heat exchanger, and the heat pipe fin heat exchanger is provided with multiple heat pipes, and the ends of the heat pipes extend into the guide water tanks.

[0009] Furthermore, a water pipe quick connector is provided on the outer side of one end of the guide water tank connected to the connecting rod, and the water pipe quick connector passes through the side wall of the heat exchange pipe 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 side of the multiple heat exchange pipes. The water pipe quick interface on one side of the heat pipe fin heat exchanger is connected to the hot water inlet ring pipe with a hose, and the water pipe quick interface on the other side is connected to the hot water outlet ring pipe with a hose.

[0011] Furthermore, a first water collecting trough is arranged below the hinge between the throat and the first sliding plate, and a second water collecting trough is arranged inside the heat exchange pipe near the hinge between the throat and the first sliding plate. A first condensate ring tube is arranged around the outer side of the multiple heat exchange pipes, and a second condensate ring tube is arranged around the inner side. The first water collecting trough is connected to the second condensate ring tube, and the second water collecting trough is connected to the first condensate ring tube.

[0012] Furthermore, a mother liquid inlet ring pipe is arranged around the top of the exhaust hood, a mother liquid outlet ring pipe is arranged around the bottom, a pipe is arranged to connect the top side of the mother liquid guide box to the mother liquid inlet ring pipe, and a pipe is arranged to connect the bottom outer side of the mother liquid guide box to the mother liquid outlet ring pipe.

[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 diffuser tube wall is horizontally slidably arranged on the guide rail and driven by the lead screw, and a second motor is arranged on the outer side of the throat to drive the lead screw.

[0015] Furthermore, a first dustproof rubber sleeve is wrapped outside the hinged joint between the first sliding plate and the throat, and a second dustproof rubber sleeve is wrapped outside the hinged joint between the second sliding plate and the diffuser pipe wall.

[0016] The advantage of the present invention over the prior art is that by pressurizing the flue gas flow and performing heat exchange at the same time, the water vapor contained in the flue gas can be liquefied and release heat, so that the steam latent heat can be fully released and absorbed. For the field of application of the present invention, the steam latent heat can be used to heat the mother liquor and the flat plate washing water, saving the cost of steam for heating the flat plate washing water, reducing energy consumption and reducing emissions.

[0017] In order to achieve the above advantages, the present invention has the following structure:

[0018] The flue gas flow rate is reduced by opening the flue gas outlet valve to increase the pressure, and a corresponding mother liquid heat exchange structure is set in the exhaust hood. Since the flue gas is pressurized and absorbs heat here, the steam is liquefied to further heat the mother liquid, which is beneficial to the subsequent evaporation of the mother liquid.

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

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

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

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

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the heat exchange pipeline of the present invention.

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

[0025] Figure 5 It is a schematic diagram of the structure of the diffusion tube wall of the present invention.

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

[0027] Figure 7 It is a schematic cross-sectional structural diagram of the diversion water box of the present invention.

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

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

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

[0031] Fig.11 It is a schematic diagram of the internal structure of the mother liquid guide box of the present invention.

[0032] Fig.12 It is a structural schematic diagram of the mother liquor inlet loop pipe of the present invention.

[0033] Fig.13 Yes Fig.12 Schematic diagram of the structure at a in the figure.

[0034] As shown in the figure: 1. Flue gas fan; 2. Flue gas duct; 3. Heat exchange duct; 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 liquid inlet ring pipe; 11. Mother liquid 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 liquid fin; 22, first water collecting tank; 23, second water collecting tank; 24, first dustproof rubber sleeve; 25, second dustproof rubber sleeve; 26, guide rail; 27, lead screw; 28, second motor; 29, second sliding plate; 30, third sliding plate; 31, guide water box; 32, heat pipe; 33, water pipe quick connector; 34, connecting rod; 35, connecting pipe; 36, mother liquid heat exchange pipe; 37, mother liquid guide box; 38, partition plate. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings.

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

[0037] An axial flow impeller 12 and a first motor 13 driving the axial flow impeller 12 are arranged inside the flue gas fan 1. The flue gas fan 1 sucks in the gas in the roasting furnace and discharges it upward and enters the heat exchange pipe 3. Temperature sensors and air pressure sensors are arranged on the inner side of the top of the heat exchange pipe 3 and inside the exhaust hood 7.

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

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

[0040] The above structure drives the screw 27 through the second motor 28 to horizontally displace the diffuser tube wall 17. When the diffuser tube 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 from the top of the throat 15 to the bottom of the diffuser tube wall 17.

[0041] When the diffuser tube wall 17 slides horizontally, the third sliding plate 30 is pulled by the diffuser tube wall 17 and the heat pipe fin heat exchanger 18 to slide vertically on the diffuser tube wall 17. During the movement of the third sliding plate 30, the angle between the heat pipe fin heat exchanger 18 and the flow channel is constantly changing. In 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 to ensure full contact with the flue gas flow.

[0042] A first dustproof rubber sleeve 24 is wrapped outside the hinged joint between the first sliding plate 16 and the throat 15 , and a second dustproof rubber sleeve 25 is wrapped outside the hinged joint between the second sliding plate 29 and the diffuser wall 17 .

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

[0044] Combined with Figure 6 and attached Figure 7The heat pipe fin heat exchanger 18 is provided with a guide water tank 31 on both sides, and a connecting rod 34 is provided at the hinge 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 the hinge 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, and the ends of the heat pipes 32 extend into the guide water tank 31.

[0045] Combined with Figure 1 and attached Figure 7 A water pipe quick connector 33 is provided on the outer side of one end of the guide water box 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.

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

[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 to the guide water tank 31 . After the hot water enters the guide water tank 31 , it absorbs heat from the end of the heat pipe 32 .

[0048] Multiple heat pipe fin heat exchangers 18 are arranged roughly in a vertical direction, wherein the top heat pipe fin heat exchanger 18 has a water pipe quick connector 33 on one side 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, and in this way, multiple heat pipe fin heat exchangers 18 are connected in series through the hose, and the bottom heat pipe fin heat exchanger 18 has a water pipe quick connector 33 that is not connected in series with the upper one and is connected to the hot water outlet ring pipe 5 by a hose.

[0049] Combined with Figure 2 and attached Figure 3 A first water collecting trough 22 is arranged below the hinge between the throat 15 and the first sliding plate 16, and a second water collecting trough 23 is arranged inside the heat exchange pipe 3 near the hinge 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, and 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.

[0050] Since the flow cross-sectional area formed at the diffuser tube wall 17 increases and a heat pipe fin heat exchanger 18 is provided for absorbing heat, when the flow rate provided by the flue gas fan 1 is constant, the flue gas flow velocity decreases due to the increase in the flow cross-sectional area, 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 absorb heat from the flue gas again 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 exchange efficiency of the heat pipe fin heat exchanger 18 is reduced. The drainage rate 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 actually installed.

[0051] Combined with Figure 2 , Attachment Figure 8 , Attachment Fig. 9 , Attachment Fig.10 and attached Fig.11 A bell hood 19 is arranged inside the exhaust hood 7, a gap is arranged between the inner wall of the exhaust hood 7 and the bell hood 19, a plurality of mother liquid guide boxes 37 are arranged around the outer surface of the bell hood 19, the plurality of mother liquid guide boxes 37 are evenly arranged, a smoke channel 20 is arranged between the mother liquid guide boxes 37, a plurality of evenly arranged mother liquid fins 21 are arranged in the smoke channel 20, a plurality of mother liquid heat exchange tubes 36 are arranged between the plurality of mother liquid guide boxes 37, the mother liquid heat exchange tubes 36 extend in a horizontal direction and pass through the mother liquid fins 21, and a plurality of inclined partition plates 38 are arranged inside the mother liquid guide box 37.

[0052] Combined with Fig.12 and attached Fig.13 A mother liquid inlet ring pipe 10 is arranged around the top of the exhaust hood 7, and a mother liquid outlet ring pipe 11 is arranged around the bottom. A pipeline is arranged to connect the top side of the mother liquid guide box 37 with the mother liquid inlet ring pipe 10, and a pipeline is arranged to connect the bottom outer side of the mother liquid guide box 37 with the mother liquid outlet ring pipe 11.

[0053] Attach Fig.11 and attached Fig.13 According to the direction shown, the partition plate 38 connects the mother liquid heat exchange tube 36 on the left side of the mother liquid guide box 37 with the mother liquid heat exchange tube 36 on the upper right, the mother liquid outlet ring pipe 11 is connected to the cavity formed by the partition plate 38 at the lower right of the mother liquid guide box 37, and the mother liquid inlet ring pipe 10 is connected to the cavity formed by the partition plate 38 at the upper left of the mother liquid guide box 37.

[0054] After the mother liquor enters the exhaust hood 7 through the mother liquor inlet ring pipe 10, it is guided by the partition plate 38 in the mother liquor guide box 37 to enter the mother liquor heat exchange pipes 36 of each layer from top to bottom and is collected to the mother liquor outlet ring pipe 11 for discharge.

[0055] The present invention reduces the speed and pressure of the flue gas and absorbs the heat of the flue gas by absorbing the heat from the flue gas while increasing the pressure and cooling the water vapor to liquefy it. During the liquefaction of the steam, the phase change releases heat and releases the latent heat of the flue gas.

[0056] Generally, the speed of the hot fluid in the device can be reduced by limiting the valve to increase the pressure. To this end, the present invention can achieve this by providing an outlet valve 9 on the flue gas outlet pipe 8. The pressure in the exhaust hood 7 is increased by limiting the opening of the outlet valve 9. A heat exchanger structure is added here and the mother liquor required for roasting aluminum hydroxide in the furnace is introduced to absorb heat. The flue gas is pressurized and cooled here, wherein the steam is liquefied and releases heat. After absorbing heat, the mother liquor is sent to the evaporation equipment for subsequent treatment.

[0057] In addition, while maintaining a certain flue gas flow rate, the flue gas flow cross-sectional area can be increased to reduce speed and increase pressure. To this end, the diffuser tube wall 17 in the upper part 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 achieve a change in the flue gas flow cross-sectional area, and a heat pipe fin heat exchanger 18 is also arranged here to cool the flue gas. In order to ensure that the heat pipe fin heat exchanger 18 can fully contact with the flue gas, the heat pipe fin heat exchanger 18 is installed in the heat exchange pipe 3 in a hinged manner, and a linkage traction device is provided to enable it to rotate synchronously when the diffuser tube wall 17 moves, thereby ensuring full contact with the flue gas.

[0058] Since the amount of smoke generated by the roasting furnace is not fixed, in order to ensure that the device has good working efficiency, temperature sensors and air pressure sensors are provided on the inner side of the top of the heat exchange pipe 3 and inside the exhaust hood 7. The first motor 13 is also selected to have a frequency conversion or speed regulation function. The opening of the outlet valve 9, the speed of the smoke fan 1 and the number of rotations of the second motor 28 are linked according to the temperature and air pressure in the device to ensure that the pressure in the device is slightly higher than the liquefaction pressure of water at the smoke temperature. The temperature can also be lower than the liquefaction temperature under the corresponding pressure by linking the external hot water input and the flow rate of the mother liquor input according to the pressure in the device.

[0059] The present invention and its implementation methods are described above, and such description is not restrictive, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by it, and does not deviate from the purpose of the invention, and does not creatively design a structure and implementation method similar to the technical solution, they should all 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); a third sliding plate (30) is vertically slidably connected to the diffuser wall (17); a plurality of heat pipe fin heat exchangers (18) are hingedly provided on the outer wall surface of the heat exchange pipe (3); and the other side of the heat pipe fin heat exchanger (18) is hingedly connected to the third sliding plate (30); 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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