Blast furnace molten slag waste heat comprehensive recycling process and system

Abstract

The application relates to the technical field of blast furnace waste heat recovery, in particular to a blast furnace molten slag waste heat comprehensive recovery and utilization process and system, which comprises the following steps: high-temperature gas is formed by contacting gas with particles generated by blast furnace molten slag granulation; heat of the high-temperature gas is transferred to cold air to preheat the cold air; and the preheated cold air is introduced into a hot blast stove. The application has the effect of improving the recovery and utilization rate of waste heat.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blast furnace waste heat recovery, in particular to a blast furnace molten slag waste heat comprehensive recovery and utilization process and system. BACKGROUND

[0002] The blast furnace is an iron-making equipment and also the first process of steel smelting. After the iron ore is smelted by the blast furnace, various types of pig iron blocks are obtained for different purposes or molten iron for steelmaking. The blast furnace gas recovery device is a device for utilizing the waste heat of unburned gas from the iron-making blast furnace and treating part of other gases contained in the gas.

[0003] The existing iron-making blast furnace gas recovery system includes a blast furnace, a coarse dust removal device and a fine dust removal device connected in sequence by pipelines. The outlet end of the fine dust removal device is provided with a residual pressure power generation device and a clean gas network in parallel. The system also includes a heat exchanger and a blast furnace slag dry granulator. The heat exchanger is connected in series between the coarse dust removal device and the fine dust removal device. The blast furnace slag dry granulator is connected to the heat exchanger. The heat exchanger is connected to a waste heat power generation device for power generation and recycling by waste heat.

[0004] In the related technology described above, the conversion rate of waste heat for power generation is low, which reduces the overall recycling rate of waste heat. SUMMARY

[0005] In order to improve the recycling rate of waste heat, the present application provides a blast furnace molten slag waste heat comprehensive recovery and utilization process and system.

[0006] In the first aspect, the present application provides a blast furnace molten slag waste heat comprehensive recovery and utilization process, which adopts the following technical solution:

[0007] A blast furnace molten slag waste heat comprehensive recovery and utilization process includes the following steps:

[0008] The gas contacts the particles generated by the granulation of the blast furnace molten slag to form a high-temperature gas;

[0009] The high-temperature gas heat is transferred to the cold air to preheat the cold air;

[0010] The preheated cold air is introduced into the hot blast stove.

[0011] By adopting the above technical solution, the high-temperature gas generated after the granulation of the molten slag transfers heat to the cold air, preheats the cold air, and directly introduces the preheated cold air into the hot blast stove for reuse, which has high utilization rate, thereby improving the recycling rate of waste heat.

[0012] In the second aspect, the present application provides a blast furnace molten slag waste heat comprehensive recovery and utilization system, which adopts the following technical solution:

[0013] The application discloses a blast furnace slag waste heat comprehensive recycling system, which adopts a heat exchanger to transfer the heat of high-temperature gas to cold air, wherein the heat exchanger comprises a hot inlet, a hot outlet, a cold inlet and a cold outlet; the hot inlet is used for leading high-temperature gas generated after granulation of blast furnace slag into the heat exchanger; the cold inlet is communicated with a cold air pipeline; and the cold outlet is connected with a cold air inlet on a hot blast stove and used for leading preheated cold air into the hot blast stove.

[0014] By adopting the above technical scheme, the high-temperature gas is communicated with the heat exchanger, the cold outlet of the heat exchanger is communicated with the cold air inlet on the blast furnace, the cold air to be led into the blast furnace is preheated by the heat exchanger, the temperature in the blast furnace is rapidly increased to a specified range, the heat of the high-temperature gas is transferred to the cold air by the heat exchanger, the conversion rate is high, the economic benefit is high, and the waste heat recycling rate is improved.

[0015] Optionally, two intermediate plates are arranged in the shell in a spaced manner, a heat exchange part is formed between the two intermediate plates and the shell, a plurality of heat exchange pipelines are arranged in the heat exchange part, a cold inlet and a cold outlet which are communicated with the heat exchange pipelines are arranged on the shell, a plurality of tube sheets are arranged in the heat exchange part, the tube sheets are arranged outside the heat exchange pipelines, the tube sheets are arranged in a sliding mode on the heat exchange pipelines, and an adjusting device is arranged on the shell and connected with the tube sheets and used for adjusting the positions of the tube sheets.

[0016] By adopting the above technical scheme, the pipeline is arranged to buffer the flow of hot gas in the heat exchange part, and the adjusting device is arranged to adjust the positions of the tube sheets, so that the flow speed of the hot gas is adjusted according to the temperature and flow speed of the hot gas and the heat exchange demand, and the production efficiency is improved.

[0017] Optionally, a through hole is formed through the tube sheet, the heat exchange pipelines are arranged in the through hole, the adjusting device comprises a driving member, an adjusting rod and an adjusting block, the adjusting rod is arranged in correspondence with the center line of the shell, a mounting hole is formed in the tube sheet, the adjusting block is arranged in the mounting hole, the adjusting rod is arranged through the adjusting block, the adjusting rod is arranged in a rotating mode in the shell, a threaded part is arranged on the adjusting rod, the adjusting rod is connected with the adjusting block in a threaded mode through the threaded part, the driving member is arranged outside the shell, and the end portion of the adjusting rod is connected with the output end of the driving member outside the shell.

[0018] By adopting the above technical scheme, the driving member drives the adjusting rod to rotate, the adjusting rod drives the adjusting block to move through the threaded part, the adjusting block drives the tube sheet to move in the heat exchange part, and the position of the tube sheet is adjusted.

[0019] Optionally, the adjusting block and the plurality of tube plates correspondingly are provided with a plurality of groups, the threaded part includes two groups of threaded parts with opposite threaded directions, the two groups of threaded parts are symmetrically arranged around the center position of the adjusting rod, and the pitch of each group of threaded parts gradually increases in the direction away from the center of the adjusting rod.

[0020] By adopting the technical scheme, the pitch of the threaded part in each group gradually increases along the length direction of the adjusting rod under the action of the threaded parts with different pitches, the spacing between the plurality of tube plates remains the same after adjustment under the rotation of the adjusting rod to drive the plurality of tube plates to move, and the airflow uniformly flows in the heat exchange part.

[0021] Optionally, the side of the intermediate plate away from the heat exchange part and the inner wall of the shell form a tail part for circulating cold air, the heat exchange pipeline and the tail part are communicated, the tail part is provided with a moving plate, the moving plate is slidingly arranged in the direction towards the intermediate plate, the adjusting rod penetrates through the moving plate, and the adjusting rod is provided with an auxiliary thread matched with the moving plate.

[0022] By adopting the technical scheme, the moving plate is arranged in the tail part, and the moving plate and the adjusting rod are matched, the moving plate is driven to move under the rotation of the adjusting rod to drive the tube plate to move, and then the flow space of the cold air in the tail part is adjusted, the flow duration of the cold air in the shell is increased or reduced, and the adaptive adjustment of heat recovery is performed.

[0023] Optionally, the side of the moving plate close to the intermediate plate is provided with a sealing sleeve, one end of the sealing sleeve away from the moving plate abuts against the side surface of the adjusting rod, the sealing sleeve is arranged outside the auxiliary thread, and the sealing sleeve is used for sealing the auxiliary thread.

[0024] By adopting the technical scheme, the sealing sleeve is arranged on the moving plate, the matching position of the moving plate and the adjusting rod is sealed by the sealing sleeve, the leakage phenomenon of the cold air at the matching position is reduced, and the stability of the cold air circulation is improved.

[0025] Optionally, the plurality of tube plates are staggered in the heat exchange part, and the plurality of tube plates form a hot gas passage in a meandering shape, so as to slow down the flow speed of the hot gas in the heat exchange part, so as to adjust the flow speed.

[0026] By adopting the technical scheme, the plurality of tube plates are staggered in the heat exchange part to form a meandering shape.

[0027] Optionally, the side of the tube plate close to the shell is arranged to be inclined in the direction towards the hot inlet.

[0028] By adopting the technical scheme, the tube plate is arranged to be inclined, so that the hot gas flows between the plurality of tube plates to transfer heat to the heat exchange pipeline.

[0029] Optionally, the plurality of tube plates are arranged in a spiral around the adjusting rod in the heat exchange part.

[0030] By adopting the above technical scheme, the heat exchange pipe and the inner wall of the through hole are arranged at intervals, so that the hot gas flows through the gap between the two, and at the same time, the heat exchange pipe part at the gap is subjected to heat transfer, the contact area of the heat exchange pipe is increased, and the heat exchange efficiency is further improved. The pipe and the inner wall of the shell are arranged at intervals, so that the hot gas flows between the tube plate and the shell, so that the hot gas fills every part of the inside of the heat exchange part when flowing, and the heat exchange effect is improved.

[0031] In summary, the present application has at least one of the following beneficial technical effects:

[0032] 1. The heat in the high-temperature gas generated by slag granulation is transferred to cold air, the cold air is preheated, and then introduced into the hot blast furnace for reuse, the conversion rate between heat is high, and the recycling rate of waste heat is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a partial cross-sectional view of the shell of the first embodiment of the present application.

[0034] Figure 2 is a structure view of the adjusting device in the first embodiment of the present application.

[0035] Figure 3 is a structure view of the moving plate in the first embodiment of the present application.

[0036] Figure 4 is a structure view of the tube plate in the second embodiment of the present application.

[0037] Figure 5 is a structure view of the support strip in the second embodiment of the present application.

[0038] Figure 6 is a structure view of the auxiliary strip in the second embodiment of the present application.

[0039] Reference signs: 1, shell; 11, heat exchange part; 12, hot inlet; 13, hot outlet; 14, head; 141, partition plate; 142, transfer part; 15, tail; 16, cold inlet; 17, cold outlet; 2, intermediate plate; 3, heat exchange pipe; 4, tube plate; 41, through hole; 42, mounting hole; 5, adjusting device; 51, driving piece; 52, adjusting rod; 53, adjusting block; 6, threaded portion; 61, auxiliary thread; 7, limiting piece; 71, worm gear; 72, worm; 8, moving plate; 81, sealing sleeve; 9, support strip; 91, auxiliary strip. DETAILED DESCRIPTION

[0040] The following will be described in detail in combination with the accompanying Figures 1-6 The present application will be further described in detail.

[0041] The application discloses a comprehensive recovery and utilization process for blast furnace slag residual heat.

[0042] The comprehensive recovery and utilization process for blast furnace slag residual heat comprises the following steps:

[0043] S1: gas contacts with particles generated by granulation of blast furnace slag to form high-temperature gas;

[0044] S2: heat of the high-temperature gas is transferred to cold air to preheat the cold air;

[0045] S3: the preheated cold air is introduced into a hot blast stove.

[0046] The transfer mode of the heat of the high-temperature gas to the cold air in the step S2 can realize heat transfer between the heat in various modes such as heat conduction, heat radiation and heat convection, and in the embodiment, the high-temperature gas and the cold air are introduced into a heat exchanger to realize heat transfer in the mode of heat conduction.

[0047] The application further discloses a comprehensive recovery and utilization system for blast furnace slag residual heat, comprising a heat exchanger, heat in high-temperature gas is transferred to cold air by the heat exchanger to preheat the cold air.

[0048] Embodiment one

[0049] With reference to Figure 1 and Figure 2 The heat exchanger comprises a shell 1, two intermediate plates 2 are arranged at intervals in the shell 1, a heat exchange part 11 is formed between the two intermediate plates 2, a hot inlet 12 and a hot outlet 13 are arranged on the shell 1, and the hot inlet 12 and the hot outlet 13 are arranged at intervals on the shell 1. A head part 14 and a tail part 15 are formed between the side, away from each other, of the two intermediate plates 2 and the inner wall of the shell 1, a partition plate 141 is arranged in the head part 14, and the partition plate 141 divides the head part 14 to form two independent transfer parts 142. A plurality of heat exchange pipes 3 are uniformly arranged between the two intermediate plates 2, and the two ends of the heat exchange pipes 3 respectively penetrate the intermediate plates 2 and communicate with the head part 14 and the tail part 15. A cold inlet 16 and a cold outlet 17 are arranged on the shell 1, and the cold inlet 16 and the cold outlet 17 respectively communicate with the two transfer parts 142.

[0050] With reference to Figure 1 and Figure 2In the process of heat recovery, the high-temperature gas generated by slag granulation is introduced into the heat exchange part 11 through the hot inlet 12, and cold air is introduced into the heat exchange pipeline 3 through the cold inlet 16 and the transfer part 142. The high-temperature gas transfers heat to the cold air through the heat exchange pipeline 3, and then is discharged through the hot outlet 13. At the same time, the cold air enters the tail part 15 through the heat exchange pipeline 3, and then enters the transfer part 142 corresponding to the cold outlet 17 through the heat exchange pipeline 3. After the high-temperature gas transfers heat to the cold air, it is finally discharged through the cold outlet 17. The air discharged from the cold outlet 17 can be used to enter the hot blast stove to achieve the effect of air preheating, thereby realizing the recycling of high-temperature gas.

[0051] With reference to Figure 1 And Figure 2 A plurality of tube sheets 4 are arranged in the heat exchange part 11. The plurality of tube sheets 4 are arranged along the length direction of the heat exchange pipeline 3. The plurality of tube sheets 4 are arranged in a staggered manner along a direction perpendicular to the length of the heat exchange pipeline 3, so that a curved channel is formed between the plurality of tube sheets 4. After the high-temperature gas enters the heat exchange part 11 through the hot inlet 12, it passes through the plurality of tube sheets 4 and is finally discharged through the hot outlet 13. The plurality of tube sheets 4 buffer the flow speed of the hot gas in the heat exchange part 11, so as to transfer heat to the heat exchange pipeline 3 and improve the heat exchange efficiency. The side of the tube sheet 4 close to the inner wall of the shell 1 is arranged in a direction towards the hot inlet 12, and the plurality of tube sheets 4 are arranged in the same direction. The tube sheet 4 is arranged in a tilted manner, so that the hot gas flowing between the plurality of tube sheets 4 transfers heat to the heat exchange pipeline 3.

[0052] With reference to Figure 1 And Figure 2 A through hole 41 is formed in the tube sheet 4, and the heat exchange pipeline 3 is arranged in the through hole 41. The tube sheet 4 is arranged in a sliding manner along the length direction of the heat exchange pipeline 3 in the heat exchange part 11. By adjusting the position of the tube sheet 4, the spacing between two adjacent tube sheets 4 is adjusted, so as to adjust the flow speed of the hot gas in the heat exchange part 11 according to the introduction speed of the hot gas and the initial temperature of the hot gas, and further improve the heat exchange efficiency.

[0053] With reference to Figure 2 And Figure 3The adjusting device 5 is arranged on the shell 1, and comprises a driving member 51, an adjusting rod 52 and adjusting blocks 53. The adjusting rod 52 is arranged in correspondence with the center line of the shell 1, and a mounting hole 42 is arranged on the tube plate 4. The adjusting rod 52 is arranged in the mounting hole 42. A plurality of adjusting blocks 53 are arranged in correspondence with the plurality of tube plates 4. The adjusting rod 52 penetrates through the adjusting blocks 53. A threaded portion 6 is arranged on the adjusting rod 52, and the adjusting rod 52 is threadedly connected with the adjusting blocks 53 through the threaded portion 6. The adjusting rod 52 is rotatably arranged in the shell 1, and the end of the adjusting rod 52 extends to the outside of the shell 1 through the tail portion 15. The driving member 51 can be an electric motor, which is arranged outside the shell 1, and the output end of the electric motor is connected with the adjusting rod 52. The driving member 51 drives the adjusting rod 52 to rotate, and the adjusting rod 52 drives the adjusting blocks 53 to move through the threaded portion 6, thereby driving the tube plate 4 to move and adjusting the position of the tube plate 4.

[0054] With reference to Figure 2 And Figure 3 A limiting member 7 is arranged between the driving member 51 and the adjusting rod 52. The limiting member 7 comprises a worm wheel 71 and a worm 72. The worm 72 is connected with the output end of the driving member 51, and the worm wheel 71 is coaxially arranged on the end of the adjusting rod 52. The worm wheel 71 is engaged with the worm 72. The driving member 51 drives the adjusting rod 52 to rotate through the worm 72 and the worm wheel 71, thereby adjusting the position of the tube plate 4. Meanwhile, the worm wheel 71 and the worm 72 are self-locking, which reduces the deviation of the tube plate 4 after adjusting the position of the tube plate 4, and improves the stability of the tube plate 4.

[0055] With reference to Figure 2 And Figure 3 The adjusting blocks 53 are arranged in multiple groups, and the multiple groups of adjusting blocks 53 are arranged in correspondence with the plurality of tube plates 4. The threaded portion 6 comprises two groups of threaded portions 6 with opposite screw directions, and the two groups of threaded portions 6 are symmetrically arranged around the center of the adjusting rod 52. That is, when the adjusting rod 52 rotates, the two groups of threaded portions 6 drive the two groups of tube plates 4 corresponding thereto to move in the direction of approaching or moving away from each other. The pitch of each group of threaded portions 6 gradually increases in the direction away from the center of the adjusting rod 52. After the adjusting rod 52 drives the tube plate 4 to move, the plurality of tube plates 4 are equally arranged in the heat exchange portion 11, that is, after the position of the tube plate 4 is adjusted, the tube plate 4 is still uniformly distributed in the heat exchange portion 11, so that the hot gas uniformly transfers heat to the heat exchange pipeline 3 in the heat exchange portion 11.

[0056] With reference to Figure 2 And Figure 3A movable plate 8 is provided in the tail portion 15 and spaced apart from the middle plate 2. The movable plate 8 is slidably provided in the tail portion 15 in the direction toward the middle plate 2. An adjusting rod 52 is provided through the middle plate 2. An auxiliary thread 61 is provided on the adjusting rod 52, and the adjusting rod 52 is threadably connected to the movable plate 8 through the auxiliary thread 61. The driving member 51 adjusts the position of the movable plate 8 while driving the tube sheet 4 to move. In addition, the spacing between the movable plate 8 and the middle plate 2 is adjusted, and the flow time of the cold air in the tail portion 15 is adjusted. It can be adaptively adjusted in conjunction with the position movement of the tube sheet 4 to further improve the heat exchange effect.

[0057] Reference Figure 2 and Figure 3 A sealing sleeve 81 is provided on the movable plate 8. The sealing sleeve 81 is located on the side of the movable plate 8 near the middle plate 2 and is fitted over the outside of the adjustment rod 52. One end of the sealing sleeve 81 is connected to the movable plate 8, and the other end slides against the side of the adjustment rod 52. The sealing sleeve 81 is provided outside the auxiliary thread 61, isolating the auxiliary thread 61 from the tail portion 15. This reduces leakage of cold air through the mating connection between the auxiliary thread 61 and the movable plate 8, improving the stability of cold air delivery.

[0058] The implementation principle of this embodiment is as follows: hot air enters the heat exchange part 11 through the heat inlet 12, and circulates in the heat exchange part 11 under the action of the tube sheet 4, and at the same time transfers the heat to the cold air in the heat exchange pipe 3 through the heat exchange pipe 3. At the same time, the adjusting rod 52 can be driven to rotate by the driving member 51 according to the heat exchange demand. The adjusting rod 52 drives multiple tube sheets 4 to move synchronously in the heat exchange part 11 through the threaded portion 6 and the adjusting block 53, adjusts the position of the tube sheet 4, and then adjusts the circulation speed of the hot air in the heat exchange part 11. By providing the driving member 51 and the adjusting rod 52 to adjust the position of the tube sheet 4, the production efficiency is improved.

[0059] Example 2

[0060] Reference Figure 4 This embodiment discloses a comprehensive system for recovering and utilizing blast furnace slag waste heat. This differs from the first embodiment in that multiple tube sheets 4 are arranged spirally around an adjusting rod 52 within a heat exchange section 11, creating a correspondingly threaded channel between the tube sheets 4. This ensures sufficient contact between the hot gas and the heat exchange pipes 3, improving heat recovery efficiency.

[0061] Reference Figure 5The diameter of the through hole 41 is greater than the diameter of the heat exchange pipe 3, and the heat exchange pipe 3 and the through hole 41 are coaxially arranged, and the side of the heat exchange pipe 3 and the inner wall of the through hole 41 are arranged at intervals. A plurality of support strips 9 are arranged on the inner wall of the through hole 41, and the plurality of support strips 9 are arranged at intervals around the heat exchange pipe 3, and the support strips 9 and the heat exchange pipe 3 are in abutment, so that the tube plate 4 and the heat exchange pipe 3 are stably matched. At the same time, hot gas can flow through the gap between the through hole 41 and the heat exchange pipe 3, increase the contact area between the hot gas and the heat exchange pipe 3, and improve the heat exchange effect.

[0062] With reference to Figure 6 The tube plate 4 is arranged at intervals with the inner wall of the shell 1, so that the hot gas can flow between the tube plate 4 and the shell 1, and the flow speed of the hot gas is slowed down by the tube plate 4, and the hot gas is guided to diffuse to all parts of the heat exchange part 11, further improving the heat exchange effect. The auxiliary strips 91 are arranged on the side of the tube plate 4 close to the inner wall of the shell 1, and the auxiliary strips 91 are arranged at intervals on the tube plate 4, and the tube plate 4 abuts against the inner wall of the shell 1 through the auxiliary strips 91, improving the stability of the cooperation between the tube plate 4 and the shell 1.

[0063] The implementation principle of the embodiment is that the tube plate 4 is arranged in a spiral shape in the heat exchange part 11, and the through hole 41 and the heat exchange pipe 3 are arranged at intervals, and the tube plate 4 and the inner wall of the shell 1 are arranged at intervals, so that the hot air flows through the gaps at all parts, increases the contact area between the hot gas and the heat exchange pipe 3, and improves the heat exchange effect of the hot gas.

[0064] The above are preferred embodiments of the present application, and are not limited to the protection scope of the present application, therefore: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A blast furnace slag waste heat comprehensive recovery and utilization system, characterized by: A heat exchanger is used to transfer the heat of the high-temperature gas to the cold air. The heat exchanger includes a hot inlet (12), a hot outlet (13), a cold inlet (16) and a cold outlet (17). The hot inlet (12) is used to pass the high-temperature gas generated after granulation of blast furnace slag into the heat exchanger. The cold inlet (16) is connected to the cold air pipeline. The cold outlet (17) is connected to the cold air inlet on the hot blast furnace to pass the preheated cold air into the hot blast furnace. The heat exchanger includes a shell (1). Two intermediate plates (2) are arranged in the shell (1). The two intermediate plates (2) are spaced apart. A heat exchange portion (11) is formed between the intermediate plate (2) and the shell (1), wherein a plurality of heat exchange pipes (3) are provided in the heat exchange portion (11), wherein the cold inlet (16) and the cold outlet (17) are both connected to the heat exchange pipe (3), wherein a plurality of tube sheets (4) are provided in the heat exchange portion (11), wherein the tube sheets (4) are sleeved on the outside of the heat exchange pipe (3), wherein the tube sheets (4) are slidably arranged on the heat exchange pipe (3), and an adjusting device (5) is provided on the shell (1), wherein the adjusting device (5) is connected to the tube sheet (4) for adjusting the position of the tube sheet (4).

2. The blast furnace slag waste heat comprehensive recovery and utilization system according to claim 1, characterized in that: The tube sheet (4) is provided with a through hole (41), the heat exchange pipe (3) is arranged in the through hole (41), the adjustment device (5) comprises a driving member (51), an adjusting rod (52) and an adjusting block (53), the adjusting rod (52) and the center line of the shell (1) are arranged correspondingly, the tube sheet (4) is provided with a mounting hole (42), the adjusting block (53) is arranged in the mounting hole (42), the adjusting rod (52) is arranged through the adjusting block (53), the adjusting rod (52) is rotatably arranged in the shell (1), the adjusting rod (52) is provided with a threaded portion (6), the adjusting rod (52) and the adjusting block (53) are threadedly connected through the threaded portion (6), the driving member (51) is arranged outside the shell (1), and the end of the adjusting rod (52) extends to the outside of the shell (1) and is connected to the output end of the driving member (51).

3. The blast furnace slag waste heat comprehensive recovery and utilization system according to claim 2, characterized in that: The adjusting block (53) and the plurality of tube sheets (4) are provided with a plurality of groups corresponding thereto. The threaded portion (6) includes two groups of threaded portions (6) with opposite thread directions. The two groups of threaded portions (6) are symmetrically arranged around the center position of the adjusting rod (52). The pitch of each group of threaded portions (6) gradually increases in a direction away from the center of the adjusting rod (52).

4. The blast furnace slag waste heat comprehensive recovery and utilization system according to claim 2, characterized in that: The side of the intermediate plate (2) facing away from the heat exchange portion (11) and the inner wall of the shell (1) form a tail portion (15) for circulating cold air. The heat exchange pipe (3) is connected to the tail portion (15). A movable plate (8) is provided in the tail portion (15). The movable plate (8) is slidably arranged in a direction toward the intermediate plate (2). The adjusting rod (52) is arranged to pass through the movable plate (8). The adjusting rod (52) is provided with an auxiliary thread (61) that cooperates with the movable plate (8).

5. The blast furnace slag waste heat comprehensive recovery and utilization system according to claim 4, characterized in that: A sealing sleeve (81) is provided on a side of the movable plate (8) close to the intermediate plate (2), and an end of the sealing sleeve (81) facing away from the movable plate (8) abuts against a side surface of the adjusting rod (52). The sealing sleeve (81) is provided outside the auxiliary thread (61) and is used to seal the auxiliary thread (61).

6. The blast furnace slag waste heat comprehensive recovery and utilization system according to claim 1, characterized in that: The plurality of tube sheets (4) are staggeredly arranged in the heat exchange portion (11), and a bent hot gas channel is formed between the plurality of tube sheets (4).

7. The blast furnace slag waste heat comprehensive recovery and utilization system according to claim 6, characterized in that: The side of the tube plate (4) close to the shell (1) is tilted in a direction toward the heat inlet (12).

8. The blast furnace slag waste heat comprehensive recovery and utilization system according to claim 2, characterized in that: The diameter of the through hole (41) is larger than the diameter of the heat exchange pipe (3), the heat exchange pipe (3) and the through hole (41) are coaxially arranged, a plurality of support bars (9) are arranged around the heat exchange pipe (3) on the inner wall of the through hole (41), the support bars (9) and the side of the heat exchange pipe (3) are in contact with each other, the side of the tube sheet (4) close to the inner wall of the shell (1) is spaced from the shell (1), the side of the tube sheet (4) close to the inner wall of the shell (1) is provided with an auxiliary bar (91), and the tube sheet (4) is in contact with the inner wall of the shell (1) through the auxiliary bar (91).

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