Preheating device based on steam turbine cold end waste heat recovery and used for chemical pretreatment of raw water

Abstract

The invention discloses a preheating device for chemical pretreatment of raw water based on steam turbine cold end waste heat recovery, and relates to the field of heat exchanger equipment, and the preheating device comprises a heat exchange pipe fitting which is used for carrying out heat exchange with circulating water and carrying out preheating treatment on raw water. And the rotating assembly is rotationally arranged on the heat exchange pipe fitting and used for rotating under the action of the circulating water and cleaning the peripheral surface of the heat exchange pipe fitting, and the rotating assembly comprises a rotating part, a swinging part arranged on the rotating part and a scraping plate arranged on the rotating part and used for rubbing the peripheral surface of the heat exchange pipe fitting. And the knocking assembly is arranged on the heat exchange pipe fitting, and the knocking assembly is located in the rotating part and used for doing reciprocating motion under the action of the rotating part to knock and clean the inner wall of the heat exchange pipe fitting. The heat exchange pipe fitting is additionally arranged, so that the temperature of chemical pretreatment raw water is greatly increased, the water production flow of reverse osmosis is increased, and the efficiency is obviously improved. And meanwhile, when circulating water is introduced, the outer circumferential surface of the heat exchange pipe fitting can be cleaned through rotation of the scraping plate, and meanwhile scale in the heat exchange pipe fitting is cleaned through the knocking assembly.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger equipment, and in particular to a preheating device based on the recovery of waste heat from the cold end of a steam turbine for the chemical pretreatment of raw water. Background Technology

[0002] The current chemical pretreatment system for raw water lacks a heating device. Raw water passes through a clarifier, multi-media filter, and ultrafiltration before entering the reverse osmosis system. Reverse osmosis primarily relies on the pressure difference of the reverse osmosis membrane to filter the water, making it highly susceptible to temperature fluctuations. In winter, when temperatures are low, the reverse osmosis permeate flow rate is significantly reduced, approximately one-third of that in summer, severely limiting water production capacity. Furthermore, existing heat exchangers are prone to scale buildup and accumulation after prolonged use, reducing heat exchange efficiency and the rate of heat recycling. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is that: after long-term heat exchange, existing heat exchangers are prone to scale buildup and accumulation, which reduces the heat exchange efficiency and the heat recycling rate.

[0004] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes a preheating device for chemical pretreatment of raw water based on the recovery of waste heat from the cold end of a steam turbine, which includes heat exchange pipes for heat exchange with circulating water to preheat the raw water.

[0005] A rotating assembly is rotatably mounted on the heat exchange tube and is used to rotate under the action of circulating water to clean the outer peripheral surface of the heat exchange tube. The assembly includes a rotating part, a swinging part mounted on the rotating part, and a scraper mounted on the rotating part for rubbing the outer peripheral surface of the heat exchange tube.

[0006] A tapping assembly is disposed on the heat exchange tube and located inside the rotating part. The tapping assembly is used to perform reciprocating motion under the action of the rotating part to tap and clean the inner wall of the heat exchange tube.

[0007] In a preferred embodiment of the preheating device for chemical pretreatment of raw water based on waste heat recovery from the cold end of a steam turbine according to the present invention: it further includes a heat exchange box, the heat exchange tubes are disposed inside the heat exchange box, and the two ends of the heat exchange tubes are respectively provided with a raw water inlet pipe and a raw water outlet pipe.

[0008] In a preferred embodiment of the preheating device for chemical pretreatment of raw water based on waste heat recovery from the cold end of a steam turbine according to the present invention: the heat exchange pipe includes a heat exchange outer shell disposed in the heat exchange box, a heat exchange inner column disposed in the heat exchange outer shell, and a connecting part disposed at both ends of the heat exchange inner column and connected to the inner wall of the heat exchange outer shell.

[0009] In a preferred embodiment of the preheating device for chemical pretreatment of raw water based on waste heat recovery from the cold end of a steam turbine as described in this invention: the rotating part includes a first rotating ring rotatably disposed on the outside of the heat exchange shell, and a second rotating ring rotatably disposed on the outside of the heat exchange shell and parallel to the first rotating ring, the second rotating ring being used to drive the striking component to strike.

[0010] In a preferred embodiment of the preheating device for chemical pretreatment of raw water based on waste heat recovery from the cold end of a steam turbine according to the present invention: the oscillating part includes a connecting plate disposed on the first rotating ring and the second rotating ring, an arc plate disposed on the end of the connecting plate away from the first rotating ring, and an oscillating plate oscillatingly disposed on the connecting plate. One end of the oscillating plate is provided with a rotating shaft rotatably connected to the connecting plate. The connecting plate is provided with a through-hole, and the through-hole has an opening facing the first rotating ring to facilitate the passage of the striking component.

[0011] In a preferred embodiment of the preheating device for chemical pretreatment of raw water based on waste heat recovery from the cold end of a steam turbine as described in this invention: a first guide groove is provided on the end face of the second rotating ring facing the first rotating ring; an arc groove is provided on the second rotating ring that communicates with the end of the first guide groove near the inner wall of the second rotating ring; a second guide groove is provided on the second rotating ring, the second guide groove being located on the side of the first guide groove away from the inner wall of the second rotating ring; and a connecting groove is provided on the second rotating ring, the connecting groove communicating with the second guide groove and the arc groove.

[0012] In a preferred embodiment of the preheating device for chemical pretreatment of raw water based on waste heat recovery from the cold end of a steam turbine according to the present invention: the striking component includes a fixed cylinder disposed on the heat exchange shell, a pushing part slidably disposed on the fixed cylinder and cooperating to pass through the fixed cylinder, and a striking ball movably disposed on the pushing part passing through one end of the fixed cylinder.

[0013] In a preferred embodiment of the preheating device for chemical pretreatment of raw water based on waste heat recovery from the cold end of a steam turbine according to the present invention: the pushing part includes a first sliding cylinder slidably disposed within the fixed cylinder, a second sliding cylinder slidably disposed within the first sliding cylinder, a pushing column provided at the bottom of the second sliding cylinder, and an elastic member disposed within the second sliding cylinder and connected to the inner wall of the fixed cylinder. The first sliding cylinder is provided with a first guide column that slides and rubs against the first guide groove, and the second sliding cylinder is provided with a second guide column that slides and rubs against the second guide groove. The pushing column is movably connected to the striking ball.

[0014] In a preferred embodiment of the preheating device for chemical pretreatment of raw water based on waste heat recovery from the cold end of a steam turbine according to the present invention: the striking ball is provided with an installation chamber, and the installation chamber is provided with a vibration component.

[0015] In a preferred embodiment of the preheating device for chemical pretreatment of raw water based on waste heat recovery from the cold end of a steam turbine as described in this invention: the vibration assembly includes a vibration ball and a spring disposed on the vibration ball and connected to the inner wall of the installation chamber, and the vibration ball is provided with auxiliary components.

[0016] The beneficial effects of this invention are as follows: by adding heat exchanger components, the temperature of the raw water from chemical pretreatment is significantly increased (from about 5°C to 20°C), the permeate flow rate of reverse osmosis increases by 40%, and the efficiency is significantly improved. Simultaneously, the increased raw water temperature utilizes the heat loss from the steam turbine, achieving waste heat recovery and utilization. When circulating water is introduced, the rotation of the scraper cleans the outer circumference of the heat exchanger components, while the striking component cleans the scale inside the components. The rotating and striking components also increase the contact area with both circulating and raw water, further improving heat exchange efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein:

[0018] Figure 1 A schematic diagram of the overall structure of the present invention is shown;

[0019] Figure 2 A cross-sectional view of the present invention is shown;

[0020] Figure 3 A schematic diagram of the rotating assembly in this invention is shown. Figure 1 ;

[0021] Figure 4 A schematic diagram of the rotating assembly in this invention is shown. Figure 2 ;

[0022] Figure 5 A schematic diagram of the striking component in this invention is shown. Figure 1 ;

[0023] Figure 6 A schematic diagram of the striking component in this invention is shown. Figure 2 . Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0025] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terminology used in this specification should not be construed as simple names, but rather based on the meaning of the terms and the overall description of the invention.

[0026] Reference Figure 1-6 This embodiment provides a preheating device for chemical pretreatment of raw water based on waste heat recovery from the cold end of a steam turbine. It includes a heat exchange tube 1 for heat exchange with circulating water to preheat the raw water. The heat exchange tube 1 is used to conduct heat in contact with the circulating water, and then the raw water is contacted and heat is transferred through the heat exchange tube 1 to preheat the raw water.

[0027] Rotating assembly 2 is rotatably mounted on heat exchange tube 1 and is used to rotate under the action of circulating water to clean the outer peripheral surface of heat exchange tube 1. It includes a rotating part 21, an oscillating part 22 mounted on the rotating part 21, and a scraper 23 mounted on the rotating part 21 for rubbing the outer peripheral surface of heat exchange tube 1. The oscillating part 22 drives the rotating part 21 to rotate under the impact of circulating water. The rotation of the rotating part 21 enables the rotation of the scraper 23, avoiding the need for additional external force to drive it. At the same time, the scraper 23 is mounted on the rotating part 21 and is located outside the heat exchange tube 11. The inner wall of the tube plate 23 slides and rubs against the outer peripheral surface of the heat exchange tube 1. When scale adheres to the outer peripheral surface of the heat exchange tube 1, the rotation of the scraper 23 will clean the outer peripheral surface of the heat exchange tube 11.

[0028] The striking component 3 is mounted on the heat exchange tube 1 and located inside the rotating part 21. It reciprocates under the action of the rotating part 21 to clean the inner wall of the heat exchange tube 1 by striking. The striking component 3 is positioned underwater and is only moved during the rotation of the rotating component 2. The combination of the rotating component 2 and the striking component 3 increases the contact area with the circulating water and raw water, thereby improving heat exchange efficiency.

[0029] In summary, by adding heat exchanger tube 1, the temperature of the chemically pretreated raw water is significantly increased (from about 5℃ to about 20℃), the permeate flow rate of reverse osmosis increases by 40%, and the efficiency is significantly improved. Meanwhile, the increase in raw water temperature utilizes the heat dissipation loss of the steam turbine, realizing the recovery and utilization of waste heat energy. When circulating water is introduced, the swing part 22 drives the rotating part 21 to rotate under the impact of the circulating water. The rotation of the rotating part 21 enables the scraper 23 to rotate, avoiding the need for additional external force to drive it. The scraper 23 is set on the rotating part 21 and is located outside the heat exchange tube 11. The inner wall of the tube plate 23 slides and rubs against the outer circumferential surface of the heat exchange tube 1. When scale adheres to the outer circumferential surface of the heat exchange tube 1, the rotation of the scraper 23 will clean the outer circumferential surface of the heat exchange tube 11. The knocking component 3 is pushed to move during the rotation of the rotating component 2, and the knocking component 3 cleans the scale inside the heat exchange tube 1. The rotating component 2 and the knocking component 3 can also increase the contact area with the circulating water and raw water, thereby improving the heat exchange efficiency.

[0030] As an optional embodiment, it also includes a heat exchange box 4, with heat exchange pipes 1 disposed inside the heat exchange box 4. Each end of the heat exchange pipe 1 is provided with a raw water inlet pipe 5 and a raw water outlet pipe 6. The heat exchange box 4 is provided with a circulating water inlet pipe 41 and a circulating water outlet pipe 42 on the opposite side of the circulating water inlet pipe 41. The circulating water inlet pipe 41 is located above the circulating water outlet pipe 42, and the central axes of the circulating water inlet pipe 41 and the circulating water outlet pipe 42 coincide. The raw water inlet pipe 5 and the raw water outlet pipe 6 are coaxial with the heat exchange pipes 1, and the raw water outlet pipe 6 is perpendicular to the circulating water inlet pipe 41. Therefore, the heat exchange pipes 1 are perpendicularly distributed to the raw water inlet pipe 5 and the raw water outlet pipe 6. The condenser circulating water return pipe is led to the south side of the chemical pretreatment system's raw water pipe entering the regulating water tank. Two plate heat exchangers are installed on the south side of the regulating water tank, and the two heat exchangers are connected by a tee pipe for easy maintenance. This application pertains to heat exchangers.

[0031] As an optional embodiment, the heat exchange fitting 1 includes a heat exchange outer shell 11 disposed within the heat exchange box 4, a heat exchange inner column 12 disposed within the heat exchange outer shell 11, and connecting portions 13 disposed at both ends of the heat exchange inner column 12 and connected to the inner wall of the heat exchange outer shell 11. The heat exchange inner column 12 is stably connected to the inner wall of the heat exchange outer shell 11 through the two connecting portions 13, forming a channel for the flow of raw water between the heat exchange outer shell 11 and the heat exchange inner column 12. The raw water is preheated simultaneously through heat conduction on both sides of the heat exchange outer shell 11 and the heat exchange inner column 12, thereby increasing the preheating speed of the raw water. The heat exchange inner column 12 has a hollow structure, which can reduce the overall weight of the device, facilitate the installation of the heat exchange inner column 12, and also improve the preheating speed of the heat exchange inner column 12. The connecting portions 13 include an annular plate 131 disposed on the heat exchange inner column 12, and a connecting column 132 disposed on the annular plate 131 and connected to the inner wall of the heat exchange outer shell 11.

[0032] As an optional embodiment, the rotating part 21 includes a first rotating ring 211 rotatably disposed on the outside of the heat exchange shell 11, and a second rotating ring 212 rotatably disposed on the outside of the heat exchange shell 11 and parallel to the first rotating ring 211. The second rotating ring 212 is used to drive the striking component 3 to strike. The second rotating ring 212 pushes the striking component 3, thereby enabling the striking component 3 to strike the heat exchange inner column 12. The striking of the striking component 3 can vibrate and clean the scale accumulated on the inner wall of the heat exchange shell 11 and the heat exchange inner column 12.

[0033] As an optional embodiment, the swing part 22 includes a connecting plate 221 disposed on the first rotating ring 211 and the second rotating ring 212, an arc plate 222 disposed on the end of the connecting plate 221 away from the first rotating ring 211, and a swing plate 223 oscillatingly disposed on the connecting plate 221. One end of the swing plate 223 is provided with a rotating shaft 7 that is rotatably connected to the connecting plate 221. The connecting plate 221 is provided with a through hole 2211, and the through hole 2211 has an opening on the side facing the first rotating ring 211 to facilitate the passage of the striking component 3. When the swinging part 22 is in a horizontal state, if the swinging plate 223 is facing upwards, the swinging plate 223 is pressed against the connecting plate 221 under the action of gravity. After the circulating water enters the heat exchange box 4, it impacts the swinging part 22, which has rotated upwards. The circulating water impacts the swinging plate 223 and the arc plate 222, and under the action of the impact force, it pushes the swinging part 22 to drive the rotating part 21 to rotate. The first rotating ring 211 and the second rotating ring 212 rotate synchronously, driving the striking component 3 to move and strike. When the swinging part 22 rotates to the bottom of the circulating water, the circulating water pushes the swinging plate 223 to swing, which facilitates the striking component 3 to pass through the through-hole 2211 without obstructing the striking component 3. This allows the striking component 3 to have sufficient displacement so that it can act inside the heat exchange inner column 12.

[0034] As an optional embodiment, the second rotating ring 212 has a first guide groove 2121 on its end face facing the first rotating ring 211, an arc groove 2122 that communicates with the first guide groove 2121 near the inner wall of the second rotating ring 212, a second guide groove 2123 located on the side of the first guide groove 2121 away from the inner wall of the second rotating ring 212, and a connecting groove 2124 that communicates with the second guide groove 2123 and the arc groove 2122. The second guide groove 2123 is misaligned with the first guide groove 2121. The second guide groove 2123 is located outside the arc groove 2122. The second guide groove 2123 and the first guide groove 2121 have an inlet on the side away from the connecting groove 2124. The striking component 3 is first slidably connected to the first guide groove 2121. When the second rotating ring 212 rotates, the striking component 3 can be pushed to rotate under the rotation of the first guide groove 2121. Under the continuous rotation of the second rotating ring 212, the striking component 3 is slidably connected to the arc groove 2122. At the same time, the striking component 3 is also slidably connected to the second guide groove 2123, so that the striking component 3 can be further compressed and moved. Because the range of movement of the striking component 3 is large enough, it can strike the heat exchange inner column 12. When the second rotating ring 212 rotates to the point where the striking component 3 is aligned with the connecting groove 2124, the second rotating ring 212 no longer pushes the striking component 3. At this time, the striking component 3 can swing.

[0035] As an optional embodiment, the striking assembly 3 includes a fixed cylinder 31 disposed on the heat exchange shell 11, a pushing part 32 slidably disposed on the fixed cylinder 31 and cooperating to extend out of the fixed cylinder 31, and a striking ball 33 movably disposed at one end of the pushing part 32 passing through the fixed cylinder 31. The striking ball 33 is located inside the heat exchange shell 11. The pushing part 32 pushes the striking ball 33 to strike the heat exchange inner column 12, cleaning the scale on the inner wall of the heat exchange inner column 12 and the heat exchange shell 11, thereby improving heat exchange efficiency. A sealing plate 311 is provided at one end of the fixed cylinder 31 that extends into the heat exchange shell 11.

[0036] As an optional embodiment, the pushing unit 32 includes a first sliding cylinder 321 slidably disposed within the fixed cylinder 31, a second sliding cylinder 322 slidably disposed inside the first sliding cylinder 321, a pushing column 323 at the bottom of the second sliding cylinder 322, and an elastic element disposed within the second sliding cylinder 322 and connected to the inner wall of the fixed cylinder 31. The first sliding cylinder 321 is provided with a first guide column 8 that slides and rubs against the first guide groove 2121, and the second sliding cylinder 322 is provided with a second guide column 9 that slides and rubs against the second guide groove 2123. The pushing column 323 is movably connected to the striking ball 33. Through the sliding connection between the first guide column 8 and the first guide groove 2121, the first sliding cylinder 321 can be moved to initially compress the elastic element during the rotation of the second rotating ring 212. Then, through the sliding connection between the second guide column 9 and the second guide groove 2123, the second sliding cylinder 322 is moved to compress the elastic element again. At this time, the pushing column 323 pushes the striking ball 33 to strike the heat exchange inner column 12.

[0037] As an optional embodiment, the striking ball 33 is provided with a mounting chamber 331, and the mounting chamber 331 is provided with a vibration component 10.

[0038] As an optional embodiment, the vibration assembly 10 includes a vibrating ball 101 and a spring 102 disposed on the vibrating ball 101 and connected to the inner wall of the mounting chamber 331. An auxiliary assembly 14 is provided inside the vibrating ball 101. The spring 102 can be used to mount the vibrating ball 101. While the vibrating ball 101 reciprocates, it drives the striking ball 33 to rotate, which can change the position of the auxiliary assembly 14 and avoids always striking the same place, thus preventing deformation of the heat exchange inner column 12 or the heat exchange outer shell 11.

[0039] As an optional embodiment, the auxiliary component 14 includes a movable ball 141 rotatably mounted on the striking ball 33, an inner connecting rod 412 mounted on the movable ball 141 and located within the mounting chamber 331, an outer connecting rod 143 mounted on the movable ball 141 and located outside the striking ball 33, and a drive rod 144 mounted on the vibrating ball 101 and movably connected to the inner connecting rod 412. An auxiliary ball 15 is provided at the end of the outer connecting rod 143 furthest from the movable ball 141. Under the vibration of the spring 102, the vibrating ball 101 drives the drive rod 144 to swing, thereby causing the inner connecting rod 412 to drive the movable ball 141, the outer connecting rod 143, and the auxiliary ball 15 to swing, continuously striking the heat exchange inner column 12 or the heat exchange outer shell 11.

[0040] As an optional embodiment, a guide assembly 16 is also included, which includes a water guide plate 161 disposed within the heat exchange box 4, a first water guide strip 162 disposed on the water guide plate 161, and a second water guide strip 163 disposed on the water guide plate 161. A water guiding channel is formed between the first water guide strip 162 and the second water guide strip 163 to guide the circulating water input from the circulating water inlet pipe 41 above the rotating assembly 2 for driving the rotating assembly 2 to rotate. The rotating assembly 2 is provided in two sets, with the first water guide strip 162 and the second water guide strip 163 symmetrically arranged in two sets, respectively driving the two sets of rotating assemblies 2 to rotate.

[0041] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A preheating device for chemical pretreatment of raw water based on waste heat recovery from the cold end of a steam turbine, characterized in that: include, Heat exchanger fittings (1) are used to exchange heat with circulating water and preheat raw water. A rotating assembly (2) is rotatably mounted on the heat exchange tube (1) and is used to rotate under the action of circulating water to clean the outer peripheral surface of the heat exchange tube (1). The assembly includes a rotating part (21), a swinging part (22) mounted on the rotating part (21), and a scraper (23) mounted on the rotating part (21) for rubbing the outer peripheral surface of the heat exchange tube (1). The striking component (3) is disposed on the heat exchange tube (1) and is located inside the rotating part (21). It is used to perform reciprocating motion under the action of the rotating part (21) to knock and clean the inner wall of the heat exchange tube (1).

2. The preheating device for chemical pretreatment of raw water based on waste heat recovery from the cold end of a steam turbine as described in claim 1, characterized in that: It also includes a heat exchange box (4), the heat exchange pipe (1) is installed in the heat exchange box (4), and the two ends of the heat exchange pipe (1) are respectively provided with a raw water inlet pipe (5) and a raw water outlet pipe (6).

3. The preheating device for chemical pretreatment of raw water based on turbine cold-end waste heat recovery according to claim 2, characterized in that: The heat exchange fitting (1) includes a heat exchange shell (11) disposed in the heat exchange box (4), a heat exchange inner column (12) disposed in the heat exchange shell (11), and a connecting part (13) disposed at both ends of the heat exchange inner column (12) and connected to the inner wall of the heat exchange shell (11).

4. The preheating device for chemical pretreatment of raw water based on turbine cold-end waste heat recovery according to claim 3, characterized in that: The rotating part (21) includes a first rotating ring (211) rotatably disposed on the outside of the heat exchange shell (11), and a second rotating ring (212) rotatably disposed on the outside of the heat exchange shell (11) and parallel to the first rotating ring (211). The second rotating ring (212) is used to drive the striking component (3) to strike.

5. The preheating device for chemical pretreatment of raw water based on turbine cold-end waste heat recovery according to claim 4, characterized in that: The swinging part (22) includes a connecting plate (221) disposed on the first rotating ring (211) and the second rotating ring (212), an arc plate (222) disposed on the end of the connecting plate (221) away from the first rotating ring (211), and a swinging plate (223) oscillatingly disposed on the connecting plate (221). One end of the swinging plate (223) is provided with a rotating shaft (7) rotatably connected to the connecting plate (221). The connecting plate (221) is provided with a through hole (2211). The through hole (2211) has an opening on the side facing the first rotating ring (211) to facilitate the passage of the striking component (3).

6. The preheating device for chemical pretreatment of raw water based on turbine cold-end waste heat recovery according to claim 4, characterized in that: The second rotating ring (212) has a first guide groove (2121) on its end face facing the first rotating ring (211). The second rotating ring (212) has an arc groove (2122) that communicates with the first guide groove (2121) near the inner wall of the second rotating ring (212). The second rotating ring (212) has a second guide groove (2123) located on the side of the first guide groove (2121) away from the inner wall of the second rotating ring (212). The second rotating ring (212) has a connecting groove (2124) that communicates with the second guide groove (2123) and the arc groove (2122).

7. The preheating device for chemical pretreatment of raw water based on turbine cold-end waste heat recovery according to claim 6, characterized in that: The striking assembly (3) includes a fixed cylinder (31) disposed on the heat exchange shell (11), a pushing part (32) slidably disposed on the fixed cylinder (31) and cooperating to pass through the fixed cylinder (31), and a striking ball (33) movably disposed at one end of the pushing part (32) passing through the fixed cylinder (31).

8. The preheating device for chemical pretreatment of raw water based on turbine cold-end waste heat recovery according to claim 7, characterized in that: The pushing part (32) includes a first sliding cylinder (321) slidably disposed in the fixed cylinder (31), a second sliding cylinder (322) slidably disposed inside the first sliding cylinder (321), a pushing column (323) provided at the bottom of the second sliding cylinder (322), and an elastic member disposed in the second sliding cylinder (322) and connected to the inner wall of the fixed cylinder (31). The first sliding cylinder (321) is provided with a first guide column (8) that slides and rubs against the first guide groove (2121), and the second sliding cylinder (322) is provided with a second guide column (9) that slides and rubs against the second guide groove (2123). The pushing column (323) is movably connected to the striking ball (33).

9. The preheating device for chemical pretreatment of raw water based on turbine cold-end waste heat recovery according to claim 8, characterized in that: The striking ball (33) is provided with an installation chamber (331), and the installation chamber (331) is provided with a vibration component (10).

10. The preheating device for chemical pretreatment of raw water based on turbine cold-end waste heat recovery according to claim 9, characterized in that: The vibration assembly (10) includes a vibrating ball (101) and a spring (102) disposed on the vibrating ball (101) and connected to the inner wall of the mounting chamber (331). An auxiliary assembly (14) is provided inside the vibrating ball (101).

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