A waste heat utilization device of a spiral finned tube economizer

Abstract

The utility model relates to the technical field of economizer, and disclose a kind of waste heat utilization device of spiral fin tube economizer, including waste heat recovery tank and the support block of fixed installation in waste heat recovery tank bottom near four corners, through the cooperation between these components of scraper, connecting rod, guide block, guide rod, side plate, threaded sleeve, threaded rod, driven gear, driving gear, L-shaped support plate, servo motor A and vertical board, can drive scraper to move on filter screen plate left and right, to realize the cleaning scraping of impurity on filter screen plate, avoid the blockage of filter screen caused by long-term use, improve the effect of filtration, and through the cooperation between these components of baffle, shaft, fixed plate, turntable and bolt, can open two sides cleaning port when cleaning filter screen plate, avoid leakage when using flue gas waste heat, cause waste, further improve the effect of use.

Description

Technical Field

[0001] This utility model relates to the technical field of economizers, specifically to a waste heat utilization device for a spiral finned tube economizer. Background Technology

[0002] With the rapid development of industry, energy consumption and waste heat emissions have become important global issues, especially in coal-fired power generation and steel smelting, where a large amount of waste heat is not fully utilized, wasting energy and exacerbating environmental pollution. Economizers, as an important thermal device, are widely used in various boilers and are of great significance for the recovery and reuse of waste heat.

[0003] In existing waste heat recovery devices for spiral finned tube economizers, flue gas is usually directly introduced into the waste heat recovery box for utilization. However, flue gas contains a large number of corrosive substances, and direct introduction will corrode the economizer pipes, thus affecting the normal operation of the waste heat recovery equipment. In addition, water vapor will be generated when flue gas comes into contact with spiral finned tubes, making the impurities in the flue gas more adherent. Adhesion on the spiral finned tubes will also affect their service life and result in poor performance.

[0004] Therefore, we propose a waste heat utilization device for a spiral finned tube economizer to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this invention is to provide a waste heat utilization device for a spiral finned tube economizer to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a waste heat utilization device for a spiral finned tube economizer, comprising a waste heat recovery box and support blocks fixedly installed at the bottom of the waste heat recovery box near the four corners. A spiral finned tube body is provided near the bottom of the inner cavity of the waste heat recovery box, and both ends of the spiral finned tube body are fixedly extended through to the outside of the waste heat recovery box and are fixedly installed with flanges A. A fixed frame is fixedly installed through the middle of the top of the waste heat recovery box. A filter screen plate is fixedly installed near the top of the inner cavity of the fixed frame, and a scraping component is installed near the left side of the top of the filter screen plate. A fume hood is fixedly installed on the top of the fixed frame, and a flange B is fixedly installed on the top of the fume hood. A shielding component is installed at the bottom of both sides of the fume hood, and a cleaning component is installed near the rear of both sides of the fume hood.

[0007] The cleaning assembly includes an n-shaped plate located on the left side of the fume hood near the rear and an L-shaped rod fixedly installed on the middle left side of the n-shaped plate. A lead screw nut is fixedly installed at the lower end of the L-shaped rod, and a reciprocating lead screw is movably installed through the lead screw nut. A rotating rod is fixedly installed through the middle of the reciprocating lead screw. Two rectangular plates are fixedly installed on the left side of the waste heat recovery box near the top, and the rectangular plates are arranged front and back. The rear end of the rotating rod is movably installed on the adjacent rectangular plate, and the front end of the rotating rod extends movably through to the outside of the adjacent rectangular plate. A servo motor B is provided on the front side of the front rectangular plate, and the output end of the servo motor B is fixedly connected to the rear end of the rotating rod.

[0008] Preferably, a sliding plate is fixedly installed on the left side of the lead screw nut, and a sliding rod is slidably installed through the sliding plate, with the front and rear ends of the sliding rod respectively fixedly installed on adjacent rectangular plates.

[0009] Preferably, a load-bearing plate is fixedly installed on the right side of the servo motor B, and the rear side of the load-bearing plate is fixedly installed on the rectangular plate on the front side.

[0010] Preferably, the fixed frame and the fume hood are provided with sliding openings on both the front and rear sides of opposite sides, and several rubber sealing blocks are fixedly installed at the top and bottom of the sliding opening cavity. The rubber sealing blocks on adjacent sides are fitted together, and material collection troughs are fixedly installed on the left and right sides of the fixed frame near the top. The fixed frame and the fume hood are provided with cleaning openings on both the left and right sides.

[0011] Preferably, the scraping assembly includes a scraper attached to the top of the filter screen near the left side and connecting rods fixedly installed at the middle of the front and rear sides of the scraper. The opposite ends of the connecting rods extend movably through to the outside of the adjacent rubber sealing blocks. A threaded sleeve is fixedly installed at the rear end of the rear connecting rod, and a threaded rod is threaded through the middle of the threaded sleeve. Two vertical plates are fixedly installed on the top of the waste heat recovery box near the rear side, and the vertical plates are arranged left and right. The left end of the threaded rod is movably installed on the adjacent vertical plate, and the right end of the threaded rod extends movably through to the outside of the adjacent vertical plate.

[0012] Preferably, a guide block is fixedly installed at the front end of the connecting rod on the front side, and a guide rod is slidably installed through the middle of the guide block. Side plates are fixedly installed at both ends of the guide rod, and the bottom of the side plates are fixedly installed on the waste heat recovery box.

[0013] Preferably, a driven gear is fixedly sleeved at the output end of the threaded rod, a driving gear meshes at the bottom of the driven gear, an L-shaped support plate is provided on the right side of the driving gear, the left side of the L-shaped support plate is fixedly installed on an adjacent vertical plate, and a servo motor A is fixedly installed on the inner wall of the inner side of the L-shaped support plate, with the output end of the servo motor A fixedly connected to the right end of the threaded rod.

[0014] Preferably, the shielding assembly includes a baffle that fits against the lower left side of the smoke hood and a rotating shaft that is fixedly installed through the baffle near the top. Fixing plates are provided on both the front and rear sides of the baffle, and the right side of the fixing plates is fixedly installed on the smoke hood. The rear end of the rotating shaft is movably installed on the adjacent fixing plate, and the front end of the rotating shaft movably extends through to the outside of the adjacent fixing plate and is fixedly installed with a turntable.

[0015] A bolt is threaded through the turntable near the left side, and threaded holes are provided on the front fixing plate near the left side and the top. The threaded rear end of the bolt extends through to the outside of the threaded hole on the left side.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. Through the cooperation of components such as scraper, connecting rod, guide block, guide rod, side plate, threaded sleeve, threaded rod, driven gear, driving gear, L-shaped support plate, servo motor A, and vertical plate, the scraper can be driven to move left and right on the filter screen, thereby cleaning and scraping away impurities on the filter screen, avoiding filter screen clogging caused by long-term use, and improving the filtration effect. Through the cooperation of components such as baffle, rotating shaft, fixed plate, turntable, and bolts, the cleaning ports on both sides can be opened when cleaning the filter screen, avoiding leakage and waste of flue gas waste heat during utilization, and further improving the use effect.

[0018] 2. Through the cooperation of components such as the n-shaped plate, L-shaped rod, lead screw nut, sliding plate, sliding rod, reciprocating lead screw, rectangular plate, servo motor B, and load-bearing plate, the n-shaped plate can be moved to scrape the surface of the scraper when it moves to the outside of the fixed frame. This avoids the waste heat of the flue gas from coming into contact with the spiral finned tube and generating moisture, which would cause impurities to adhere more to the scraper and affect the subsequent scraping effect on the filter screen. The effect is excellent. Attached Figure Description

[0019] Figure 1 This is a perspective view of the entire utility model;

[0020] Figure 2 This is a rear perspective view of the present invention;

[0021] Figure 3 This is a partial unfolded perspective view of the present invention;

[0022] Figure 4 This is a partial cross-sectional perspective view of the present invention.

[0023] Figure 5 For the present utility model Figure 2 Enlarged view of point A in the middle;

[0024] Figure 6 This is a partial cross-sectional perspective view of the waste heat recovery box of this utility model;

[0025] Figure 7 This is a partial three-dimensional view of the smoke hood of this utility model;

[0026] Figure 8 This is a partial bottom-view perspective view of the threaded rod of this utility model;

[0027] Figure 9 For the present utility model Figure 4 Enlarged view at point B in the middle;

[0028] Figure 10 For the present utility model Figure 8 Enlarged view of point C.

[0029] In the diagram: 1. Waste heat recovery box; 2. Support block; 3. Spiral finned tube body; 4. Flange A; 5. Fixing frame; 6. Filter screen; 7. Scraping assembly; 71. Scraper; 72. Connecting rod; 721. Guide block; 722. Guide rod; 723. Side plate; 73. Threaded sleeve; 74. Threaded rod; 741. Driven gear; 742. Driven gear; 743. L-shaped support plate; 744. Servo motor A; 75. Vertical plate 8. Shielding assembly; 81. Baffle; 82. Rotating shaft; 83. Fixing plate; 84. Turntable; 841. Bolt; 9. Cleaning assembly; 91. N-shaped plate; 92. L-shaped rod; 93. Screw nut; 931. Sliding plate; 932. Sliding rod; 94. Reciprocating screw; 95. Rectangular plate; 96. Servo motor B; 961. Load-bearing plate; 10. Fume hood; 20. Flange B; 30. Rubber sealing block; 40. Collection trough. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1

[0032] Please see Figure 1-10A waste heat utilization device for a spiral finned tube economizer includes a waste heat recovery box 1 and support blocks 2 fixedly installed at the bottom of the waste heat recovery box 1 near the four corners. An exhaust pipe is fixedly installed through the middle of the bottom of the waste heat recovery box 1, and a one-way valve (not shown in the figure) is provided on the exhaust pipe. A spiral finned tube body 3 is provided near the bottom of the inner cavity of the waste heat recovery box 1, and both ends of the spiral finned tube body 3 are fixedly extended through to the outside of the waste heat recovery box 1, and flanges A4 are fixedly installed on both ends. A fixing frame 5 is fixedly installed through the middle of the top of the waste heat recovery box 1, and the inner cavity of the fixing frame 5 is near the top. A filter screen plate 6 is fixedly installed at the top of the filter screen plate 6 near the left side. A smoke hood 10 is fixedly installed at the top of the fixed frame 5. A flange B20 is fixedly installed at the top of the smoke hood 10. A shielding component 8 is installed at the bottom of both sides of the smoke hood 10. A cleaning component 9 is installed at the rear side of both sides of the smoke hood 10. The scraping component 7 can clean the impurities on the surface of the filter screen plate 6. The shielding component 8 can open and close the cleaning port. The cleaning component 9 can clean the impurities adhering to the scraper 71 again.

[0033] In this example, the scraping assembly 7 includes a scraper 71 attached to the top of the filter screen 6 near the left side and connecting rods 72 fixedly installed at the middle of the front and rear sides of the scraper 71. The opposite ends of the connecting rods 72 extend movably through to the outside of the adjacent rubber sealing blocks 30. A threaded sleeve 73 is fixedly installed at the rear end of the rear connecting rod 72. A threaded rod 74 is threaded through the middle of the threaded sleeve 73. Two vertical plates 75 are fixedly installed on the top of the waste heat recovery box 1 near the rear side. The vertical plates 75 are arranged left and right. The left end of the threaded rod 74 is movably installed on the adjacent vertical plate 75, and the right end of the threaded rod 74 extends movably through to the outside of the adjacent vertical plate 75. This allows the scraper 71 to move back and forth on the filter screen 6, which is beneficial for scraping and cleaning impurities on the filter screen 6.

[0034] Specifically, a guide block 721 is fixedly installed at the front end of the front connecting rod 72, and a guide rod 722 is slidably installed through the middle of the guide block 721. Side plates 723 are fixedly installed at both ends of the guide rod 722, and the bottom of the side plates 723 is fixedly installed on the waste heat recovery box 1, which serves to guide and limit the movement of the scraper 71, thus ensuring good stability.

[0035] Specifically, a driven gear 741 is fixedly sleeved at the output end of the threaded rod 74, and a driving gear 742 meshes with the bottom of the driven gear 741. An L-shaped support plate 743 is provided on the right side of the driving gear 742. The left side of the L-shaped support plate 743 is fixedly installed on the adjacent vertical plate 75, and a servo motor A744 is fixedly installed on the inner wall of the inner side of the L-shaped support plate 743. The output end of the servo motor A744 is fixedly connected to the right end of the threaded rod 74, which facilitates the provision of power for the rotation of the threaded rod 74.

[0036] In this example, the shielding assembly 8 includes a baffle 81 attached to the lower left side of the fume hood 10 and a rotating shaft 82 fixedly installed through the baffle 81 near the top. Fixing plates 83 are provided on both the front and rear sides of the baffle 81, and the right side of the fixing plates 83 is fixedly installed on the fume hood 10. The rear end of the rotating shaft 82 is movably installed on the adjacent fixing plate 83, and the front end of the rotating shaft 82 movably extends through to the outside of the adjacent fixing plate 83 and is fixedly installed with a turntable 84, which can realize the opening and closing of the cleaning port, thereby facilitating the cleaning of impurities on the filter screen 6.

[0037] Specifically, a bolt 841 is threaded through the turntable 84 near the left side, and threaded holes are opened on the front fixing plate 83 near the left side and the top. The threaded end of the bolt 841 extends through to the outside of the threaded hole on the left side, which serves to lock and limit the turntable 84.

[0038] Specifically, sliding openings are provided on both the front and rear sides of the fixed frame 5 and the fume hood 10 on opposite sides. Several rubber sealing blocks 30 are fixedly installed on the top and bottom of the inner cavity of the sliding opening. The rubber sealing blocks 30 on adjacent sides are fitted together. Material collection troughs 40 are fixedly installed on the left and right sides of the fixed frame 5 near the top. Cleaning openings are provided on both the left and right sides of the fixed frame 5 and the fume hood 10. The rubber sealing blocks 30 are used to seal the sliding openings and facilitate the movement of the connecting rod 72 in the sliding openings. The cleaning openings are used to clean impurities on the filter screen 6.

[0039] In this embodiment: During use, the exhaust pipe can be connected to the fume hood 10 via flange B20, allowing the flue gas to be discharged into the waste heat recovery box 1. The spiral finned tube body 3 can absorb and utilize the waste heat in the flue gas. In addition, the filter screen 6 filters and adsorbs the dust contained in the flue gas, preventing impurities in the flue gas from contacting the outside of the spiral finned tube body 3 and thus adhering to the spiral finned tube body 3, thereby realizing the utilization of waste heat in the flue gas. The filter screen 6 can also be scraped and cleaned periodically. The operation of the servo motor A744 drives the threaded rod 74 to rotate. When the threaded rod 74 rotates, it drives the threaded sleeve 73 to move back and forth left and right. When the threaded sleeve 73 moves left and right, it will pass through the threaded rod 74. The connecting rod 72 drives the scraper 71 to move back and forth on the filter screen 6, scraping away impurities on the filter screen 6 and pushing the impurities into the collection troughs 40 on both sides through the cleaning port, which is convenient for the staff to clean the whole thing later. Before scraping the filter screen 6, the bolts 841 on both sides can be rotated to move them away from the inner cavity of the threaded hole. Then the turntable 84 is rotated. When the turntable 84 rotates, it will drive the adjacent rotating shaft 82 to rotate. When the rotating shaft 82 rotates, it will drive the adjacent baffle 81 to deflect outward, which will open the cleaning port. After opening, the rotation of the turntable 84 can be stopped. Then the bolts 841 are rotated in the opposite direction so that their threads pass through the inner cavity of the adjacent threaded hole, which serves to lock and position the turntable 84.

[0040] Example 2

[0041] This embodiment is an improvement upon embodiment 1. For details, please refer to [link / reference]. Figure 2-3 and Figure 7-10 The cleaning component 9 includes an n-shaped plate 91 located on the left side of the fume hood 10 near the rear, and an L-shaped rod 92 fixedly installed on the middle left side of the n-shaped plate 91. A lead screw nut 93 is fixedly installed at the lower end of the L-shaped rod 92, and a reciprocating lead screw 94 is movably installed through the lead screw nut 93. A rotating rod is fixedly installed through the middle of the reciprocating lead screw 94. Two rectangular plates 95 are fixedly installed on the left side of the waste heat recovery box 1 near the top, and the rectangular plates 95 are arranged front and back. The rear end of the rotating rod is movably installed on the adjacent rectangular plate 95, and the front end of the rotating rod extends movably through to the outside of the adjacent rectangular plate 95. A servo motor B96 is provided on the front side of the front rectangular plate 95. The output end of the servo motor B96 is fixedly connected to the rear end of the rotating rod, which can drive the n-shaped plate 91 to move back and forth, thereby achieving the scraping and cleaning of impurities adhering to the scraper 71 and avoiding the impurities adhering to the scraper 71 from affecting its scraping effect on the filter screen 6.

[0042] Specifically, a sliding plate 931 is fixedly installed on the left side of the lead screw nut 93, and a sliding rod 932 is slidably installed through the sliding plate 931. The front and rear ends of the sliding rod 932 are respectively fixedly installed on adjacent rectangular plates 95, which serves to guide and limit the movement of the lead screw nut 93, thus ensuring good stability.

[0043] Specifically, a load-bearing plate 961 is fixedly installed on the right side of the servo motor B96, and the rear side of the load-bearing plate 961 is fixedly installed on the rectangular plate 95 on the front side, which serves to support the servo motor B96.

[0044] In this embodiment: when the scraper 71 moves to the outside of the cleaning port, the servo motor B96 can be started. When the servo motor B96 runs, it will drive the rotating rod to rotate. When the rotating rod rotates, it will drive the reciprocating screw 94 to rotate. When the reciprocating screw 94 rotates, it will drive the screw nut 93 to move back and forth. When the screw nut 93 moves back and forth, it will drive the n-shaped plate 91 to move outside the scraper 71 through the L-shaped rod 92, thereby removing the impurities adhering to the scraper 71 and preventing the impurities adhering to the scraper 71 from affecting the scraping operation of the impurities on the filter screen plate 6. After the scraping is completed, the n-shaped plate 91 can be restored.

[0045] Working Principle: During use, the exhaust pipe can be connected to the fume hood 10 via flange B20, allowing the flue gas to be discharged into the waste heat recovery box 1. The spiral finned tube body 3 absorbs and utilizes the waste heat in the flue gas. Furthermore, the filter plate 6 filters and adsorbs dust contained in the flue gas, preventing impurities from contacting the outside of the spiral finned tube body 3 and adhering to it, thus utilizing the waste heat in the flue gas. The filter plate 6 can also be periodically scraped and cleaned. The servo motor A744 drives the threaded rod 74 to rotate, which in turn drives the threaded sleeve 73 to move back and forth. This movement of the threaded sleeve 73, via the connecting rod 72, drives the scraper 71 to move back and forth on the filter plate 6, scraping away impurities. The impurities are then pushed into the collection troughs 40 on both sides through the cleaning port for easy subsequent cleaning. Before scraping the filter plate 6, the bolts 84 on both sides can be rotated. 1. Move the scraper away from the inner cavity of the threaded hole, then rotate the turntable 84. The rotation of the turntable 84 will cause the adjacent shaft 82 to rotate, which in turn will cause the adjacent baffle 81 to deflect outwards, thus opening the cleaning port. After opening, stop rotating the turntable 84. Then, rotate the bolt 841 in the opposite direction so that its threads pass through the inner cavity of the adjacent threaded hole, thus securing and positioning the turntable 84. Furthermore, when the scraper 71 moves to the outside of the cleaning port, the servo motor B96 can be activated. When the servo motor B96 is running, it drives the rotating rod to rotate, which in turn drives the reciprocating lead screw 94 to rotate. When the reciprocating lead screw 94 rotates, it drives the lead screw nut 93 to move back and forth. When the lead screw nut 93 moves back and forth, it drives the n-shaped plate 91 to move outside the scraper 71 through the L-shaped rod 92, thereby scraping off the impurities adhering to the scraper 71 and preventing the impurities adhering to the scraper 71 from affecting the scraping operation of the impurities on the filter screen 6. After the scraping is completed, the n-shaped plate 91 can be restored.

[0046] The spiral finned tube body 3 involved in this application is a prior art that is disclosed. Its function is to utilize the waste heat in the flue gas. It is a disclosed technology, so this application will not describe it in detail.

[0047] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0048] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A waste heat utilization device for a spiral finned tube economizer, comprising a waste heat recovery box (1) and support blocks (2) fixedly installed at the bottom of the waste heat recovery box (1) near the four corners, characterized in that: The inner cavity of the waste heat recovery box (1) is provided with a spiral finned tube (3) near the bottom, and both ends of the spiral finned tube (3) are fixedly extended through to the outside of the waste heat recovery box (1) and are fixedly installed with flanges A (4). A fixed frame (5) is fixedly installed through the middle of the top of the waste heat recovery box (1). A filter screen plate (6) is fixedly installed near the top of the inner cavity of the fixed frame (5), and a scraping component (7) is installed near the left side of the top of the filter screen plate (6). A smoke hood (10) is fixedly installed on the top of the fixed frame (5), and a flange B (20) is fixedly installed on the top of the smoke hood (10). A shielding component (8) is installed at the bottom of both the left and right sides of the smoke hood (10), and a cleaning component (9) is installed near the rear of both the left and right sides of the smoke hood (10). The cleaning assembly (9) includes an n-shaped plate (91) located on the left side of the fume hood (10) near the rear side and an L-shaped rod (92) fixedly installed on the middle left side of the n-shaped plate (91). A screw nut (93) is fixedly installed at the lower end of the L-shaped rod (92), and a reciprocating screw (94) is movably installed through the screw nut (93). A rotating rod is fixedly installed through the middle of the reciprocating screw (94). Two rectangular plates (95) are fixedly installed on the left side of the waste heat recovery box (1) near the top, and the rectangular plates (95) are arranged front and back. The rear end of the rotating rod is movably installed on the adjacent rectangular plate (95), and the front end of the rotating rod extends movably through to the outside of the adjacent rectangular plate (95). A servo motor B (96) is provided on the front side of the front rectangular plate (95), and the output end of the servo motor B (96) is fixedly connected to the rear end of the rotating rod.

2. The waste heat utilization device for a spiral finned tube economizer according to claim 1, characterized in that: A sliding plate (931) is fixedly installed on the left side of the lead screw nut (93), and a sliding rod (932) is slidably installed through the sliding plate (931). The front and rear ends of the sliding rod (932) are respectively fixedly installed on adjacent rectangular plates (95).

3. The waste heat utilization device for a spiral finned tube economizer according to claim 1, characterized in that: A load-bearing plate (961) is fixedly installed on the right side of the servo motor B (96), and the rear side of the load-bearing plate (961) is fixedly installed on the rectangular plate (95) on the front side.

4. The waste heat utilization device for a spiral finned tube economizer according to claim 1, characterized in that: The fixed frame (5) and the fume hood (10) are provided with sliding openings on the front and back sides of opposite sides. Several rubber sealing blocks (30) are fixedly installed at the top and bottom of the sliding opening cavity. The rubber sealing blocks (30) on adjacent sides are fitted together. The left and right sides of the fixed frame (5) are fixedly installed with material collection troughs (40) near the top. The left and right sides of the fixed frame (5) and the fume hood (10) are provided with cleaning openings.

5. The waste heat utilization device for a spiral finned tube economizer according to claim 4, characterized in that: The scraping assembly (7) includes a scraper (71) attached to the top of the filter screen (6) near the left side and connecting rods (72) fixedly installed at the middle of the front and rear sides of the scraper (71). The opposite ends of the connecting rods (72) extend through to the outside of the adjacent rubber sealing block (30). A threaded sleeve (73) is fixedly installed at the rear end of the rear connecting rod (72). A threaded rod (74) is threaded through at the middle of the threaded sleeve (73). Two vertical plates (75) are fixedly installed at the top of the waste heat recovery box (1) near the rear side. The vertical plates (75) are arranged left and right. The left end of the threaded rod (74) is movably installed on the adjacent vertical plate (75), and the right end of the threaded rod (74) extends through to the outside of the adjacent vertical plate (75).

6. The waste heat utilization device for a spiral finned tube economizer according to claim 5, characterized in that: A guide block (721) is fixedly installed at the front end of the connecting rod (72) on the front side, and a guide rod (722) is slidably installed through the middle part of the guide block (721). Side plates (723) are fixedly installed at both ends of the guide rod (722), and the bottom of the side plates (723) is fixedly installed on the waste heat recovery box (1).

7. The waste heat utilization device for a spiral finned tube economizer according to claim 5, characterized in that: The output end of the threaded rod (74) is fixedly sleeved with a driven gear (741), and the bottom of the driven gear (741) is meshed with a driving gear (742). An L-shaped support plate (743) is provided on the right side of the driving gear (742). The left side of the L-shaped support plate (743) is fixedly installed on the adjacent vertical plate (75), and a servo motor A (744) is fixedly installed on the inner wall of the inner side of the L-shaped support plate (743). The output end of the servo motor A (744) is fixedly connected to the right end of the threaded rod (74).

8. The waste heat utilization device for a spiral finned tube economizer according to claim 1, characterized in that: The shielding assembly (8) includes a baffle (81) attached to the lower left side of the smoke hood (10) and a rotating shaft (82) fixedly installed through the baffle (81) near the top. Fixing plates (83) are provided on both the front and rear sides of the baffle (81), and the right side of the fixing plates (83) is fixedly installed on the smoke hood (10). The rear end of the rotating shaft (82) is movably installed on the adjacent fixing plate (83), and the front end of the rotating shaft (82) movably extends through to the outside of the adjacent fixing plate (83) and is fixedly installed with a turntable (84). A bolt (841) is threaded through the turntable (84) near the left side, and threaded holes are provided on the front fixing plate (83) near the left side and the top. The rear thread of the bolt (841) extends through to the outside of the threaded hole on the left side.

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