A polycrystalline silicon reduction heat energy utilization system and method

Abstract

This invention discloses a polycrystalline silicon reduction heat energy utilization system and method. The system includes a reduction furnace body, a base, a heat exchange jacket, an internal coil in the base, an external heat exchange jacket for the return water pipe, and a flash tank assembly. The internal coil in the base has a double-layer structure and is connected by a vertical pipe. The heat exchange jacket is divided into several arc-shaped jackets with parallel branch pipes equipped with solenoid valves. The jacket is equipped with vibrating plates and flow guides. The return water pipe is fitted with a heat exchange jacket with a flow guide plate. The drain pipe and return water pipe are respectively connected to different flash tanks. The method utilizes an infrared temperature sensor linked with a solenoid valve to achieve zoned temperature measurement and flow initiation. Through temperature-controlled vibration coordination, gradient heat exchange and water collection, and tiered flash evaporation for energy supply, heat energy from different parts is recovered and multi-level steam is generated according to the temperature gradient to meet diverse steam demand. This invention constructs a multi-dimensional heat energy recovery system, achieving efficient heat energy recovery and tiered adaptive energy supply, accurately controlling the furnace temperature, improving production continuity and stability, and has significant energy-saving and practical value.

Description

Technical Field

[0001] This invention relates to the field of polycrystalline silicon reduction heat energy utilization technology, and in particular to a polycrystalline silicon reduction heat energy utilization system and method. Background Technology

[0002] In the polysilicon production process, the reduction furnace, as a core production piece of equipment, consumes a large amount of electrical energy during operation. The surface of the silicon rod releases a significant amount of heat, which simultaneously heats the furnace cylinder, chassis, and materials inside. Efficiently recovering and utilizing this heat is a key direction for reducing the unit production cost of polysilicon and achieving energy conservation and emission reduction in the industry.

[0003] Currently, although polysilicon manufacturers have gradually paid attention to heat recovery in reduction furnaces and adopted various forms of heat utilization technologies, existing technologies still have many prominent defects: some companies directly discharge the cooling water of the reduction furnace chassis after cooling it with circulating water, without effectively recovering heat energy, resulting in serious waste of heat energy; most companies can only generate single-level steam through flash evaporation of hot water in the tail gas pipe jacket and furnace drum, which cannot meet the diverse steam needs of different stages in polysilicon production, such as distillation units, heating systems, and lithium bromide units, resulting in low heat utilization efficiency; at the same time, the industry generally faces the technical challenge of accurately controlling the amount of water replenished during flash evaporation. Due to the large water consumption of flash evaporation, the water in the flash tank is easily depleted by rapid evaporation, which in turn cannot meet the cooling needs of the reduction furnace, causing production safety accidents such as overheating of the reduction furnace and equipment damage, seriously affecting the continuity and stability of production. Summary of the Invention

[0004] The technical problem to be solved by this invention is the existing polysilicon reduction furnaces, which suffer from heat energy waste, inability to adapt to diverse steam demand, and difficulty in controlling water replenishment, which can easily lead to safety accidents. To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a polycrystalline silicon reduction heat energy utilization system, including a reduction furnace body, a base is provided at the bottom of the reduction furnace body, a heat exchange jacket is installed on the side wall of the reduction furnace body, an inlet water pipe and a return water pipe are connected to the base, the inlet water pipe and the return water pipe are connected to the coil inside the base, a heat exchange sleeve is fitted on the return water pipe, a water supply pipe and a drain pipe are connected to the heat exchange sleeve, and the drain pipe and the return water pipe are respectively connected to different flash tanks of the flash tank group.

[0005] Preferably, an installation plate is fixedly installed inside the base, and the coil includes a first heat exchange coil and a second heat exchange coil. The first heat exchange coil and the second heat exchange coil are respectively connected to the top and bottom of the installation plate. The water inlet pipe is connected to the input end of the second heat exchange coil, the output end of the second heat exchange coil is connected to the input end of the first heat exchange coil, and the output end of the first heat exchange coil is connected to the return water pipe.

[0006] Preferably, the edge of the mounting plate is fixedly connected to the inner side wall of the base. The mounting plate has a hollow structure and vertical holes are evenly distributed on the mounting plate. A vertical pipe is fixedly connected between the second heat exchange coil and the first heat exchange coil, and the vertical pipe is located in the vertical hole.

[0007] Preferably, the heat exchange sleeve includes an arc-shaped first jacket and a second jacket, which are assembled into a cylindrical shape. The heat exchange sleeve is connected in series on the return water pipe. The ends of the first jacket and the second jacket are fixedly connected to flange plates and connected to the return water pipe by flange plates and bolts. The inner sides of the first jacket and the second jacket are provided with arc-shaped plate-shaped partitions.

[0008] Preferably, the top of the first jacket is provided with a connecting sleeve, and the water supply pipe and the drain pipe are respectively connected to the two connecting sleeves. The annular space outside the partition after the first jacket and the second jacket are assembled is connected to the water supply pipe and the drain pipe. An arc-shaped guide plate is fixed on the outside of the partition. The guide plate is coaxially arranged with the heat exchange sleeve and the guide plates are staggered along the axial direction of the heat exchange sleeve.

[0009] Preferably, the first jacket and the second jacket are respectively provided with a strip groove and a strip protrusion on their mating surfaces, a sealing strip is installed at the bottom of the strip groove, and the strip protrusion is adapted to the strip groove.

[0010] Preferably, the heat exchange jacket includes several arc-shaped sheet-like jackets, which are attached to the outer wall of the reduction furnace body. The jackets have a hollow structure. A water supply ring pipe and a water return ring pipe are respectively fitted on the top and bottom of the side wall of the reduction furnace body. The inside of the jacket is connected to the water supply ring pipe and the water return ring pipe.

[0011] Preferably, the top of each jacket is connected to a branch pipe, which is connected in parallel to the water supply ring pipe. A solenoid valve is installed on the branch pipe, and a rib is vertically fixed inside the jacket.

[0012] Preferably, a vibrating plate is fixed on the inner wall of the jacket. The vibrating plate is connected to the contact wall between the jacket and the reduction furnace body. The vibrating plate is arranged at an angle downward. The thickness of the vibrating plate decreases from the fixed end to the movable end. A guide block is fixed on the inner wall of the other side of the jacket. The top of the guide block is provided with an arc-shaped surface. The guide block is positioned directly opposite the vibrating plate.

[0013] A method for utilizing the heat energy of polycrystalline silicon reduction, using the aforementioned utilization system, involves installing infrared temperature sensors on the outer wall of the reduction furnace body, and the infrared temperature sensors being linked to the signals of solenoid valves on the heat exchange jacket branch pipes, comprising the following steps: Step 1: Zoned temperature measurement and flow start-up. The infrared temperature sensor detects the temperature and temperature difference of each part of the reduction furnace body in real time. Only the solenoid valve on the heat exchange jacket branch pipe corresponding to the part with higher temperature is activated to introduce cooling water into the water supply ring pipe. The cooling water flows into the arc-shaped jacket of the part with higher temperature through the branch pipe. At the same time, cooling water is introduced into the water inlet pipe. The cooling water flows through the second heat exchange coil at the bottom of the mounting plate and the first heat exchange coil at the top of the mounting plate in sequence to complete the heat exchange of the base. After heat exchange, it flows into the heat exchange jacket through the return water pipe. Cold water is added to the water supply pipe of the heat exchange jacket for secondary heat exchange. Step Two: Temperature Control and Vibration Synergy. Cooling water within the heat exchange jacket impacts the arc-shaped surface of the guide block, creating turbulence. This turbulence continuously washes over the tilted vibrating plates, causing them to vibrate at high frequencies. This vibration is transmitted to the sidewalls of areas with higher temperatures within the reduction furnace body. While maintaining the ambient temperature of the reduction furnace, the vibration strips away amorphous silicon impurities adhering to the inner wall of these areas, simultaneously reducing the thickness of the adhering layer on the heat exchange surface and enhancing localized heat transfer. Step 3: Gradient heat exchange water collection. Collect the high-temperature hot water flowing out of the heat exchange jacket, the medium-temperature hot water discharged from the heat exchange sleeve, and the low-temperature hot water flowing out of the base coil. According to the temperature gradient, transport them to different flash tanks of the flash tank group through dedicated pipelines. The heat exchange jacket that is not started is kept in an empty flow or micro-flow state to maintain the overall temperature stability of the reduction furnace body. Step 4: Cascaded flash evaporation for energy supply. Hot water at different temperature gradients enters the corresponding flash tanks for flash evaporation, generating high-pressure, medium-pressure, and low-pressure steam respectively. High-pressure steam is delivered to the polysilicon production distillation unit, medium-pressure steam is delivered to the plant heating unit, and low-pressure steam is delivered to the lithium bromide unit, realizing the cascaded adaptation and utilization of thermal energy.

[0014] This invention provides a polycrystalline silicon reduction heat energy utilization system and method, which has the following beneficial effects.

[0015] 1. This invention constructs a multi-dimensional heat energy recovery system through a multi-layer heat exchange structure consisting of a double-layer heat exchange coil inside the base, a heat exchange jacket on the side wall of the reduction furnace, and a heat exchange sleeve outside the return water pipe. The double-layer heat exchange coil in the base can fully absorb the heat emitted from the bottom of the reduction furnace, the heat exchange jacket on the side wall fits the furnace body to efficiently recover the heat from the furnace cylinder, and the heat exchange sleeve outside the return water pipe performs secondary waste heat recovery on the hot water that has already been heated. This avoids the problems of direct discharge of cooling water from the chassis and incomplete utilization of waste heat in the prior art. At the same time, through the gradient water collection design, all the heat energy recovered in each stage is collected and utilized, which greatly improves the heat energy recovery and utilization rate and solves the defect of serious waste of heat energy from the root.

[0016] 2. Addressing the issue that existing technologies can only generate a single level of steam and cannot meet the steam demands of multiple stages, this invention combines gradient heat exchange water collection with staged flash evaporation. The recovered heat energy is categorized according to temperature gradient: high-temperature hot water from the heat exchange jacket, medium-temperature hot water from the heat exchange tubes, and low-temperature hot water from the base coils are respectively delivered to different flash tanks in the flash tank group, generating high-pressure, medium-pressure, and low-pressure steam. The high-pressure steam meets the steam demands of the distillation unit in polysilicon production, the medium-pressure steam satisfies the plant's heating needs, and the low-pressure steam supplies the lithium bromide unit. This precisely matches the diverse steam demands of each stage of polysilicon production, solving the problem of low thermal energy utilization efficiency in existing technologies.

[0017] 3. Adopting a zoned temperature control mode, the infrared temperature sensor on the outer wall of the reduction furnace body is linked with the solenoid valve signal of the heat exchange jacket branch pipe. Heat exchange is only activated in areas with higher temperatures, while non-activated areas remain in an idling or micro-flow state. This maintains the stable temperature environment required for polysilicon production, avoids ineffective consumption of cooling water, and reduces the pressure of flash evaporation water replenishment. The water replenishment volume can be precisely adjusted according to the water consumption characteristics of different flash tanks, preventing the water in the flash tanks from being quickly depleted and ensuring a continuous and stable supply of cooling water to the reduction furnace. This completely solves the problems of difficult precise control of water replenishment volume in existing technologies, which can easily lead to overheating of the reduction furnace and equipment damage, significantly improving production continuity and operational stability. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0019] Figure 2 This is a structural front view of an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the coil structure in an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the internal structure of the heat exchanger sleeve in an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the heat exchange jacket in an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the internal structure of the heat exchange jacket in an embodiment of the present invention.

[0024] In the diagram: 1. Reduction furnace body; 2. Base; 3. Heat exchanger jacket; 4. Heat exchanger sleeve; 21. Inlet pipe; 22. Return pipe; 23. Mounting plate; 24. First heat exchanger coil; 25. Second heat exchanger coil; 31. Water supply pipe; 32. Drainage pipe; 33. First jacket; 34. Second jacket; 35. Partition plate; 36. Guide plate; 41. Water supply ring pipe; 42. Water return ring pipe; 43. Jacket; 44. Vibrating plate; 45. Flow guide block. Detailed Implementation

[0025] like Figures 1 to 6 As shown, the present invention provides a polycrystalline silicon reduction heat energy utilization system, including a reduction furnace body 1, a base 2 at the bottom of the reduction furnace body 1, a heat exchange jacket 4 installed on the side wall of the reduction furnace body 2, an inlet pipe 21 and a return pipe 22 connected to the base 2, the inlet pipe 21 and the return pipe 22 connected to the coil inside the base 2, a heat exchange sleeve 3 fitted on the return pipe 22, a water supply pipe 31 and a drain pipe 32 connected to the heat exchange sleeve 3, and the drain pipe 32 and the return pipe 22 respectively connected to different flash tanks of the flash tank group.

[0026] The drain pipe 32, return water pipe 22 and the output end of the heat exchange jacket 4 are all connected to different flash tanks in the flash tank group. The water output from the heat exchange jacket 4 has the highest temperature and is used to produce high-pressure steam. The water in the return water pipe 22 is cooled down after one heat exchange and is used to produce medium-pressure steam. The water in the drain pipe 32 is heated and then heated once by the water in the return water pipe 22 and is used to produce low-pressure steam.

[0027] like Figures 1 to 3 As shown in the diagram. A mounting plate 23 is fixedly installed inside the base 2. The coils include a first heat exchange coil 24 and a second heat exchange coil 25. The first heat exchange coil 24 and the second heat exchange coil 25 are respectively connected to the top and bottom of the mounting plate 23. The inlet pipe 21 is connected to the input end of the second heat exchange coil 25, the output end of the second heat exchange coil 25 is connected to the input end of the first heat exchange coil 24, and the output end of the first heat exchange coil 24 is connected to the return water pipe 22. Both the first heat exchange coil 24 and the second heat exchange coil 25 are suspended. The mounting plate 23 is used for the fixed installation of the first heat exchange coil 24 and the second heat exchange coil 25. The second heat exchange coil 25 is used for initial heat exchange, after which water enters the first heat exchange coil 24 for further heat exchange to obtain high-temperature water, which is then discharged through the return water pipe 22.

[0028] In a preferred embodiment of the present invention, to improve the stability of the heat exchange coil installation, the edge of the mounting plate 23 is fixedly connected to the inner sidewall of the base 2. The mounting plate 23 has a hollow structure, and vertical holes are evenly distributed on the mounting plate 23. A vertical pipe is fixedly connected between the second heat exchange coil 25 and the first heat exchange coil 24, and the vertical pipe is located inside the vertical holes. The hollow mounting plate 23 can provide stable support for the installation of the first heat exchange coil 24 and the second heat exchange coil 25, and can ensure that heat is transferred to the second heat exchange coil 25.

[0029] like Figure 1 and Figure 4 As shown. The heat exchange sleeve 3 includes an arc-shaped first jacket 33 and a second jacket 34, which are assembled into a cylindrical shape. The heat exchange sleeve 3 is connected in series with the return water pipe 22. Flange plates are fixedly connected to the ends of both the first jacket 33 and the second jacket 34, and they are connected to the return water pipe 22 by the flange plates and bolts. Arc-shaped baffles 35 are provided on the inner side of both the first jacket 33 and the second jacket 34. The first jacket 33 and the second jacket 34 are assembled into a cylindrical structure. A sealed cavity is formed in the inner wall of the cylindrical structure by the inner baffles 35. Water in the return water pipe 22 flows from the outside of the baffles 35, and water in the water supply pipe 31 flows in the sealed cavity to exchange heat.

[0030] like Figure 1 and Figure 4 As shown. A connecting sleeve is provided at the top of the first jacket 33. The water supply pipe 31 and the drain pipe 32 are respectively connected to the two connecting sleeves. The annular space outside the partition 35 after the first jacket 33 and the second jacket 34 are joined communicates with the water supply pipe 31 and the drain pipe 32. An arc-shaped guide plate 36 is fixed to the outside of the partition 35. The guide plate 36 is coaxially arranged with the heat exchange sleeve 3 and is staggered along the axial direction of the heat exchange sleeve 3. The guide plate 36 is used to guide the flow of water in the sealed cavity, making the water flow in a directional manner, increasing the flow path, and improving the heat exchange efficiency.

[0031] As a preferred embodiment of the present invention, the mating surfaces of the first jacket 33 and the second jacket 34 are respectively provided with strip grooves and strip protrusions. A sealing strip is installed at the bottom of the strip groove, and the strip protrusion is adapted to fit the strip groove. By adding strip grooves and strip protrusions to adapt the first jacket 33 and the second jacket 34, the tightness of the connection between the first jacket 33 and the second jacket 34 is ensured, and the sealing performance of the heat exchange sleeve 3 is improved.

[0032] like Figure 1 , Figure 2 and Figure 5As shown. The heat exchange jacket 4 includes several arc-shaped sheet-like jackets 43, which are attached to the outer wall of the reduction furnace body 1. The jackets 43 are hollow structures. A water supply ring pipe 41 and a water return ring pipe 42 are respectively fitted on the top and bottom of the side wall of the reduction furnace body 1. The inside of the jacket 43 is connected to the water supply ring pipe 41 and the water return ring pipe 42. The jacket 43 completely covers the outer wall of the reduction furnace body 1. The water supply ring pipe 41 supplies water to the inside of the jacket 43 for heat recovery. Infrared temperature sensors are arranged on the outer wall of the reduction furnace body 1 to detect whether the temperature of the outer wall of the reduction furnace body 1 is uniform. When the temperature of a certain part is too high due to heat radiation absorption caused by internal agglomeration, the water flow rate inside the corresponding jacket 43 is increased to maintain the uniform temperature inside the reduction furnace body 1.

[0033] As a preferred embodiment of the present invention, each jacket 43 has a branch pipe connected to its top. The branch pipes are connected in parallel to the water supply ring pipe 41, and a solenoid valve is installed on the branch pipe. A rib plate is vertically fixed inside each jacket 43. The rib plate is used to enhance the structural strength of the jacket 43. Based on the detection of the reduction furnace body 1 by the infrared temperature sensor, the corresponding solenoid valve is selected to open, supplying water to the jacket 43 at that location for heat exchange and cooling.

[0034] like Figure 6 As shown. A vibrating plate 44 is fixed to the inner wall of the jacket 43. The vibrating plate 44 is connected to the contact wall between the jacket 43 and the reduction furnace body 1. The vibrating plate 44 is arranged inclined downwards, and its thickness decreases from the fixed end to the movable end. A guide block 45 is fixedly installed on the other inner wall of the jacket 43. The top of the guide block 45 has an arc-shaped surface, and the guide block 45 is positioned directly opposite the vibrating plate 44. When water is supplied to the jacket 43, the water flows from top to bottom into the jacket 43. During the flow, it is guided by the guide block 45, and the water flow impacts the vibrating plate 44, causing the vibrating plate 44 to vibrate. This, in turn, drives the corresponding mounting side wall of the jacket 43 to vibrate. This side wall is tightly fitted to the outer wall of the reduction furnace body 1, causing this part of the reduction furnace body 1 to vibrate. This vibration removes amorphous silicon impurities adhering to the inner side of this part of the reduction furnace body 1, thereby maintaining the smoothness of the inner wall of the reduction furnace body 1 and improving the production efficiency of polycrystalline silicon inside the reduction furnace.

[0035] A method for utilizing the heat energy of polycrystalline silicon reduction, using the aforementioned utilization system, involves an infrared temperature sensor installed on the outer wall of the reduction furnace body 1, which is linked to the signal of a solenoid valve on the branch pipe of the heat exchange jacket 4, and includes the following steps: Step 1: Zoned temperature measurement and flow start-up. The infrared temperature sensor detects the temperature and temperature difference of each part of the reduction furnace body 1 in real time. Only the solenoid valve on the branch pipe of the heat exchange jacket 4 corresponding to the part with higher temperature is activated to introduce cooling water into the water supply ring pipe 41. The cooling water flows into the arc-shaped jacket 43 of the part with higher temperature through the branch pipe. At the same time, cooling water is introduced into the water inlet pipe 21. The cooling water flows through the second heat exchange coil 25 at the bottom of the mounting plate 23 in the base 2 and the first heat exchange coil 24 at the top of the mounting plate 23 to complete the base heat exchange. After heat exchange, it flows into the heat exchange sleeve 3 through the return water pipe 22. Cold water is added to the water supply pipe 31 of the heat exchange sleeve 3 for secondary heat exchange. Step 2: Temperature control and vibration coordination. Cooling water inside the heat exchange jacket 4 impacts the arc-shaped surface of the guide block 45, creating turbulence. This turbulence continuously washes over the inclined vibrating plates 44, causing them to vibrate at high frequencies. This vibration is transmitted to the sidewalls of the high-temperature areas in the reduction furnace body 1. While maintaining the ambient temperature of the reduction furnace, the vibration removes amorphous silicon impurities adhering to the inner wall of these areas, simultaneously reducing the thickness of the adhering layer on the heat exchange surface and enhancing localized heat transfer. Step 3: Gradient heat exchange and water collection. Collect the high-temperature hot water flowing out of the heat exchange jacket 4, the medium-temperature hot water discharged from the heat exchange sleeve 3, and the low-temperature hot water flowing out of the coil of the base 2. According to the temperature gradient, the hot water is transported to different flash tanks of the flash tank group through a dedicated pipeline. The heat exchange jacket 4 that is not started is kept in an empty flow or micro-flow state to maintain the overall temperature stability of the reduction furnace body 1. Step 4: Cascaded flash evaporation for energy supply. Hot water at different temperature gradients enters the corresponding flash tanks for flash evaporation, generating high-pressure, medium-pressure, and low-pressure steam respectively. High-pressure steam is delivered to the polysilicon production distillation unit, medium-pressure steam is delivered to the plant heating unit, and low-pressure steam is delivered to the lithium bromide unit, realizing the cascaded adaptation and utilization of thermal energy.

Claims

1. A polysilicon reduction heat energy utilization system, characterized by: The furnace includes a reduction furnace body (1), a base (2) is provided at the bottom of the reduction furnace body (1), a heat exchange jacket (4) is installed on the side wall of the reduction furnace body (2), an inlet pipe (21) and a return pipe (22) are connected to the base (2), the inlet pipe (21) and the return pipe (22) are connected to the coil inside the base (2), a heat exchange sleeve (3) is fitted on the return pipe (22), a water supply pipe (31) and a drain pipe (32) are connected to the heat exchange sleeve (3), and the drain pipe (32) and the return pipe (22) are respectively connected to different flash tanks of the flash tank group.

2. The polycrystalline silicon reduction heat energy utilization system as described in claim 1, characterized in that: An installation plate (23) is fixedly installed inside the base (2). The coil includes a first heat exchange coil (24) and a second heat exchange coil (25). The first heat exchange coil (24) and the second heat exchange coil (25) are respectively connected to the top and bottom of the installation plate (23). The water inlet pipe (21) is connected to the input end of the second heat exchange coil (25). The output end of the second heat exchange coil (25) is connected to the input end of the first heat exchange coil (24). The output end of the first heat exchange coil (24) is connected to the return water pipe (22).

3. The polycrystalline silicon reduction heat energy utilization system as described in claim 2, characterized in that: The edge of the mounting plate (23) is fixedly connected to the inner wall of the base (2). The mounting plate (23) has a hollow structure and vertical holes are evenly opened on the mounting plate (23). A vertical pipe is fixedly connected between the second heat exchange coil (25) and the first heat exchange coil (24), and the vertical pipe is located in the vertical hole.

4. The polycrystalline silicon reduction heat energy utilization system as described in claim 1, characterized in that: The heat exchange sleeve (3) includes an arc-shaped first jacket (33) and a second jacket (34). The first jacket (33) and the second jacket (34) are assembled into a cylindrical shape. The heat exchange sleeve (3) is connected in series on the return water pipe (22). The ends of the first jacket (33) and the second jacket (34) are fixedly connected to flange plates and connected to the return water pipe (22) through flange plates and bolts. The inner sides of the first jacket (33) and the second jacket (34) are provided with arc-shaped plate-shaped partitions (35).

5. The polycrystalline silicon reduction heat energy utilization system as described in claim 4, characterized in that: The top of the first jacket (33) is provided with a connecting sleeve. The water supply pipe (31) and the drain pipe (32) are respectively connected to the two connecting sleeves. The outer annular space of the partition (35) after the first jacket (33) and the second jacket (34) are joined together is connected to the water supply pipe (31) and the drain pipe (32). An arc-shaped guide plate (36) is fixed on the outer side of the partition (35). The guide plate (36) is coaxially arranged with the heat exchange sleeve (3). The guide plates (36) are staggered along the axial direction of the heat exchange sleeve (3).

6. The polycrystalline silicon reduction heat energy utilization system as described in claim 4, characterized in that: The first jacket (33) and the second jacket (34) are respectively provided with a strip groove and a strip protrusion. A sealing strip is installed at the bottom of the strip groove, and the strip protrusion is adapted to the strip groove.

7. The polycrystalline silicon reduction heat energy utilization system as described in claim 1, characterized in that: The heat exchange jacket (4) includes several arc-shaped jackets (43). The jackets (43) are attached to the outer wall of the reduction furnace body (1). The jackets (43) are hollow. The top and bottom of the side wall of the reduction furnace body (1) are respectively fitted with a water supply ring pipe (41) and a water return ring pipe (42). The inside of the jacket (43) is connected to the water supply ring pipe (41) and the water return ring pipe (42).

8. The polycrystalline silicon reduction heat energy utilization system as described in claim 7, characterized in that: Each jacket (43) has a branch pipe connected to its top. The branch pipe is connected in parallel to the water supply ring pipe (41). A solenoid valve is installed on the branch pipe. A rib is vertically fixed inside the jacket (43).

9. The polycrystalline silicon reduction heat energy utilization system as described in claim 7, characterized in that: A vibrating plate (44) is fixed on the inner wall of the jacket (43). The vibrating plate (44) is connected to the contact wall between the jacket (43) and the reduction furnace body (1). The vibrating plate (44) is arranged inclined downward. The thickness of the vibrating plate (44) decreases from the fixed end to the movable end. A guide block (45) is fixed on the inner wall of the other side of the jacket (43). The top of the guide block (45) is provided with an arc-shaped surface. The guide block (45) is positioned directly opposite the vibrating plate (44).

10. A method for utilizing the heat energy of polycrystalline silicon reduction, characterized in that, Using the utilization system as described in any one of claims 1-9, an infrared temperature sensor is installed on the outer wall of the reduction furnace body (1), and the infrared temperature sensor is linked to the solenoid valve signal on the branch pipe of the heat exchange jacket (4), including the following steps: Step 1: Zone temperature measurement and flow start-up. The temperature and temperature difference of each part of the reduction furnace body (1) are detected in real time by infrared temperature sensor. Only the solenoid valve on the branch pipe of the heat exchange jacket (4) corresponding to the part with higher temperature is activated to introduce cooling water into the water supply ring pipe (41). The cooling water flows into the arc-shaped jacket (43) of the part with higher temperature through the branch pipe. At the same time, cooling water is introduced into the water inlet pipe (21). The cooling water flows through the second heat exchange coil (25) at the bottom of the mounting plate (23) in the base (2) and the first heat exchange coil (24) at the top of the mounting plate (23) to complete the base heat exchange. After heat exchange, it flows into the heat exchange sleeve (3) through the return water pipe (22). Cold water is added to the water supply pipe (31) of the heat exchange sleeve (3) for secondary heat exchange. Step 2: Temperature control and vibration coordination. Cooling water inside the heat exchange jacket (4) impacts the arc-shaped surface of the guide block (45) to form turbulence. The turbulence continuously washes over the inclined vibrating plates (44), causing them to generate high-frequency micro-vibrations. The vibration is transmitted to the side wall of the part of the reduction furnace body (1) where the temperature is too high. Under the premise of maintaining the production environment temperature of the reduction furnace, the amorphous silicon impurities attached to the inner wall of this part are peeled off by vibration. At the same time, the thickness of the wall layer on the heat exchange surface is reduced to enhance local heat exchange. Step 3: Gradient heat exchange water collection, collecting high-temperature hot water flowing out of heat exchange jacket (4), medium-temperature hot water discharged from heat exchange sleeve (3), and low-temperature hot water flowing out of base (2) coil. According to the temperature gradient, it is transported to different flash tanks of the flash tank group through special pipelines. The heat exchange jacket (4) that is not started is kept in an empty flow or micro flow state to maintain the overall temperature stability of the reduction furnace body (1). Step 4: Cascaded flash evaporation for energy supply. Hot water at different temperature gradients enters the corresponding flash tanks for flash evaporation, generating high-pressure, medium-pressure, and low-pressure steam respectively. High-pressure steam is delivered to the polysilicon production distillation unit, medium-pressure steam is delivered to the plant heating unit, and low-pressure steam is delivered to the lithium bromide unit, realizing the cascaded adaptation and utilization of thermal energy.

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