Abrasion-resistant shell-and-tube heat exchanger and polycrystalline silicon production system

Abstract

The utility model provides an abrasion-resistant shell-and-tube heat exchanger and a polycrystalline silicon production system, and relates to the technical field of heat exchangers. The wear-resistant shell-and-tube heat exchanger comprises a shell, the inlet tube plate is arranged in the shell and divides the shell into a first chamber for introducing a first fluid and a second chamber for accommodating a second fluid; the heat exchange tubes are arranged in the second cavity, the heat exchange tubes are partially inserted into the inlet tube plate, and the first ends of the heat exchange tubes communicate with the first cavity; each protection assembly comprises a protection pipe, an elastic piece and a limiting piece; the protective tubes are inserted into the heat exchange tubes through the first ends of the corresponding heat exchange tubes; the limiting piece is arranged at the end, facing the first cavity, of the protection pipe and abuts against the end face, facing the first cavity, of the inlet pipe plate so that the protection pipe can be fixed into the heat exchange pipe through the elastic piece and the limiting piece. According to the shell-and-tube heat exchanger, the problem that tube openings of the heat exchange tubes in the shell-and-tube heat exchanger are prone to abrasion is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchangers, in particular to a wear-resistant shell-and-tube heat exchanger and a polysilicon production system. BACKGROUND

[0002] A heat exchanger is a device for transferring heat between two or more fluids, and the heat exchanger includes a shell-and-tube heat exchanger.

[0003] In the prior art, the shell-and-tube heat exchanger includes a shell, an inlet tube plate and heat exchange tubes; the inlet tube plate and the heat exchange tubes are arranged in the shell, and the heat exchange tubes are inserted on the inlet tube plate. The shell is used for receiving a first fluid, the first fluid in the shell flows out of the shell through the heat exchange tubes, the shell has a second fluid located around the heat exchange tubes, and the first fluid and the second fluid transfer heat through the heat exchange tubes.

[0004] In some use conditions of the shell-and-tube heat exchanger, the first fluid contains particulate matter, and when the first fluid flows into the heat exchange tube, the direction of its velocity is gradually changed by the inner wall of the heat exchange tube until it is parallel to the heat exchange tube; the first fluid will generate an impact force on the inner wall near the port of the heat exchange tube, which is easy to cause the heat exchange tube to be eroded near the port. SUMMARY

[0005] The present application provides a wear-resistant shell-and-tube heat exchanger and a polysilicon production system, which are used to solve the problem that the port of the heat exchange tube in the shell-and-tube heat exchanger is easy to be eroded.

[0006] A wear-resistant shell-and-tube heat exchanger, comprising:

[0007] a shell;

[0008] an inlet tube plate arranged in the shell and separating the shell into a first chamber for introducing a first fluid and a second chamber for containing a second fluid;

[0009] at least one heat exchange tube arranged in the second chamber, the heat exchange tube being partially inserted on the inlet tube plate, and a first end of the heat exchange tube being in communication with the first chamber;

[0010] at least one protection assembly, the protection assembly comprising a protection tube, an elastic member and a limiting member; the protection tube is inserted in the heat exchange tube through the first end of the corresponding heat exchange tube; the elastic member is arranged on the outer wall of the protection tube, and the elastic member abuts against the inner wall of the heat exchange tube; the limiting member is arranged at one end of the protection tube facing the first chamber, and abuts against the end face of the inlet tube plate facing the first chamber, so as to fix the protection tube in the heat exchange tube through the elastic member and the limiting member.

[0011] In some embodiments, the number of elastic members is multiple, and the multiple elastic members are sequentially and spacedly arranged along the circumferential direction of the protection tube.

[0012] In some embodiments, the elastic member is an elastic ring sleeved on the protection tube.

[0013] In some embodiments, the outer diameter of the elastic ring gradually increases from the first end of the elastic ring to the second end of the elastic ring, and the second end of the elastic ring is towards the first chamber.

[0014] In some embodiments, the outer wall of the protection tube has an annular groove, the elastic ring is arranged in the annular groove, and part of the elastic ring is located outside the annular groove.

[0015] In some embodiments, the heat exchange tube comprises a first plug-in section, the first plug-in section is plugged on the inlet tube plate, the first plug-in section sequentially comprises a first sub-section, a transition sub-section and a second sub-section coaxially connected from the first chamber to the second chamber, the inner diameter of the first sub-section is smaller than the inner diameter of the second sub-section, and the inner diameter of the transition sub-section gradually increases from the first sub-section to the second sub-section.

[0016] The inner wall of the first sub-section and the outer wall of the protection tube are in abutment, and the elastic member is in abutment with the inner wall of the transition sub-section.

[0017] In some embodiments, the inlet tube plate has at least one tube plate hole, the first sub-section and the second sub-section are plugged on the inlet tube plate through the tube plate hole, the outer wall of the second sub-section is in abutment with the inner wall of the tube plate hole, there is a gap between the first sub-section and the tube plate hole, a weld layer is arranged in the gap, and the weld layer is flush with one end of the inlet tube plate towards the first chamber.

[0018] In some embodiments, the protection assembly further comprises a baffle, the limiting member is a baffle arranged around the protection tube, and the baffle covers the weld layer.

[0019] In some embodiments, the abrasion-resistant shell-and-tube heat exchanger further comprises an outlet tube plate, the outlet tube plate is arranged in the shell, the second chamber is located between the inlet tube plate and the outlet tube plate, the heat exchange tube further comprises a transition section and a second plug-in section, the first end of the transition section and the second sub-section are coaxially connected, the second end of the transition section and the second plug-in section are coaxially connected, and the second plug-in section is plugged on the outlet tube plate.

[0020] The protection tube at least partially extends into the transition section from the transition section.

[0021] A polysilicon production system comprises a polysilicon reactor and the abrasion-resistant shell-and-tube heat exchanger, and the polysilicon reactor is connected with the abrasion-resistant shell-and-tube heat exchanger.

[0022] The application provides an abrasion-resistant shell-and-tube heat exchanger and a polysilicon production system, which comprise a shell, an inlet tube plate, at least one heat exchange tube and at least one protection assembly. The shell is divided into a first chamber for introducing a first fluid and a second chamber for containing a second fluid by the inlet tube plate. The first fluid flows into the first end of the heat exchange tube from the first containing chamber to perform heat transfer with the second fluid through the heat exchange tube. The inner wall near the pipe opening of the first end of the heat exchange tube is protected by the protection pipe of the protection assembly. When the first fluid flows into the heat exchange tube, the protection pipe bears the scouring of the first fluid, so that the inner wall near the pipe opening of the first end of the heat exchange tube is not directly scoured by the first fluid, thereby solving the problem that the pipe opening of the heat exchange tube in the shell-and-tube heat exchanger is easily abraded. The protection pipe is fixed in the heat exchange tube by the abutment of the elastic member and the inner wall of the heat exchange tube and the abutment of the limiting member and the end face of the inlet tube plate towards the first chamber, so that the position of the protection pipe is prevented from moving when the first fluid impacts the protection pipe. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0024] Figure 1 A structural schematic view of the abrasion-resistant shell-and-tube heat exchanger provided by the embodiments of the present application is shown in the figure.

[0025] Figure 2 A structural schematic view of the abrasion-resistant shell-and-tube heat exchanger provided by the embodiments of the present application is shown in the figure. Figure 1 A structural schematic view of the abrasion-resistant shell-and-tube heat exchanger provided by the embodiments of the present application is shown in the figure.

[0026] Figure 3 A structural schematic view of the abrasion-resistant shell-and-tube heat exchanger provided by the embodiments of the present application is shown in the figure. Figure 2 An enlarged view of part A in the figure.

[0027] Figure 4 A structural schematic view of the abrasion-resistant shell-and-tube heat exchanger provided by the embodiments of the present application is shown in the figure. Figure 1 A structural schematic view of the abrasion-resistant shell-and-tube heat exchanger provided by the embodiments of the present application is shown in the figure.

[0028] Figure 5 A structural schematic view of the abrasion-resistant shell-and-tube heat exchanger provided by the embodiments of the present application is shown in the figure. Figure 1 A structural schematic view of the abrasion-resistant shell-and-tube heat exchanger provided by the embodiments of the present application is shown in the figure.

[0029] Figure 6 A structural schematic view of the abrasion-resistant shell-and-tube heat exchanger provided by the embodiments of the present application is shown in the figure. Figure 1 A structural schematic view of the abrasion-resistant shell-and-tube heat exchanger provided by the embodiments of the present application is shown in the figure.

[0030] REFERENCE SIGNS:

[0031] 100 - shell; 110 - first chamber; 120 - second chamber;

[0032] 200 - inlet tube plate; 210 - weld layer;

[0033] 300 - heat exchange tube; 310 - first plug-in section; 311 - first sub-section; 312 - transition sub-section; 313 - second sub-section; 320 - transition section; 330 - second plug-in section;

[0034] 400 - protection assembly; 410 - protection tube; 411 - annular groove; 420 - elastic member; 421 - first end of elastic ring; 422 - second end of elastic ring; 430 - limiting member; 440 - sealing gasket;

[0035] 500 - outlet tube plate.

[0036] The specific embodiments of the application have been shown by way of example in the above figures, and will be described in more detail hereafter. These figures and this written description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate the inventive concept to one of ordinary skill in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0037] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, like reference numerals refer to like elements, unless the context clearly dictates otherwise. The following description is not intended to limit the scope of the application, but rather to provide an example of how the application can be implemented in accordance with some aspects of the application as detailed in the appended claims.

[0038] In the description of the present application, it is necessary to explain that, unless explicitly defined and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the embodiments of the present application, the words "exemplary" or "for example" are used to mean example, instance, or illustration. Any embodiment or design scheme described as "exemplary" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "exemplary" or "for example" is intended to present relevant concepts in a concrete manner.

[0040] Moreover, the terms "comprising" and "including" and any variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements does not necessarily comprise only those steps or elements

[0041] The heat exchanger is a device for transferring heat between two or more fluids, and the heat exchanger includes a tube-shell heat exchanger.

[0042] In the prior art, the tube-shell heat exchanger includes a shell, an inlet tube plate, and a heat exchange tube; the inlet tube plate and the heat exchange tube are arranged in the shell, and the heat exchange tube is inserted on the inlet tube plate. The shell is used for receiving a first fluid, the first fluid in the shell flows out of the shell through the heat exchange tube, the shell has a second fluid around the heat exchange tube, and the first fluid and the second fluid transfer heat through the heat exchange tube.

[0043] In some use conditions of the tube-shell heat exchanger, the first fluid contains particulate matter, and when the first fluid flows into the heat exchange tube, the direction of the velocity of the first fluid is gradually changed by the inner wall of the heat exchange tube until it is parallel to the heat exchange tube. The change of the direction of the velocity requires a force, and in the process of gradually changing the direction of the velocity of the first fluid by the inner wall of the heat exchange tube until it is parallel to the heat exchange tube, the inner wall near the tube opening of the heat exchange tube exerts the force on the first fluid. Based on this reason, the inner wall near the tube opening of the heat exchange tube has a large frequency of contact with the particulate matter and receives a large reaction force, so the inner wall near the tube opening of the heat exchange tube is easily eroded.

[0044] For example, polysilicon is an important basic material in the semiconductor and photovoltaic industries. A large number of tube-shell heat exchangers are used in the production process of polysilicon.

[0045] For example, a polysilicon reactor has a gas outlet, and the gas (first fluid) discharged from the gas outlet has a high heat and contains silicon powder (particulate matter). The polysilicon reactor is connected with the tube-shell heat exchanger, so that the heat in the gas is absorbed by the tube-shell heat exchanger to achieve the purpose of energy recycling.

[0046] In order to solve the problem that the inner wall near the pipe opening of the heat exchange pipe is easy to be eroded, the application provides a kind of anti-erosion shell-and-tube heat exchanger, which comprises a shell, an inlet tube plate, at least one heat exchange pipe and at least one protection assembly. The protection assembly comprises a heat exchange pipe, an elastic member and a limiting member. The inner wall near the pipe opening of the first end of the heat exchange pipe is protected by the protection pipe. When the first fluid flows into the heat exchange pipe, the protection pipe bears the scouring of the first fluid, so as to avoid the direct scouring of the first fluid on the inner wall near the pipe opening of the first end of the heat exchange pipe, thereby solving the problem that the pipe opening of the heat exchange pipe in the shell-and-tube heat exchanger is easy to be eroded. The protection pipe is fixed in the heat exchange pipe by the abutment of the elastic member with the inner wall of the heat exchange pipe and the abutment of the limiting member with the end face of the inlet tube plate facing the first chamber, so as to avoid the movement of the protection pipe when the first fluid impacts the protection pipe.

[0047] Reference Figures 1 to 4 The application provides a kind of anti-erosion shell-and-tube heat exchanger, which comprises a shell 100;Inlet tube plate 200, inlet tube plate 200 is arranged in shell 100, and shell 100 is divided into first chamber 110 for introducing first fluid and second chamber 120 for containing second fluid;At least one heat exchange pipe 300, heat exchange pipe 300 is arranged in second chamber 120, heat exchange pipe 300 is partially inserted on inlet tube plate 200, and the first end of heat exchange pipe 300 communicates with first chamber 110.

[0048] At least one protection assembly 400, protection assembly 400 includes protection pipe 410, elastic member 420 and limiting member 430;Protection pipe 410 is inserted in heat exchange pipe 300 through the first end of corresponding heat exchange pipe 300;Elastic member 420 is arranged on the outer wall of protection pipe 410, and elastic member 420 abuts with the inner wall of heat exchange pipe 300, limiting member 430 is arranged at one end of protection pipe 410 facing first chamber 110, and limiting member 430 abuts on the end face of inlet tube plate 200 facing first chamber 110, so as to fix protection pipe 410 in heat exchange pipe 300 by elastic member 420 and limiting member 430.

[0049] It should be noted that inlet tube plate 200 is a plate, and the inlet tube plate is used to support and fix the first end of heat exchange pipe 300 in shell 100, and isolate the first fluid and the second fluid. In the application, the material of inlet tube plate 200 is not limited, and the material of inlet tube plate 200 is usually metal, such as stainless steel.

[0050] The shape of the shell 100 is not limited in the application. Most shell-and-tube heat exchangers use cylindrical shells.

[0051] For example, the contour of the inlet tube plate 200 is consistent with the contour of the cross section inside the shell 100, and the inlet tube plate 200 can be welded on the inner wall of the shell 100.

[0052] The material of the heat exchange pipe 300 is not limited in the embodiments of the present application. For example, the material of the heat exchange pipe 300 can be stainless steel or nickel-based alloy. The stainless steel has high strength and strong corrosion resistance. The nickel-based alloy has stronger corrosion resistance than the stainless steel, but has relatively poor economy.

[0053] For example, the protective pipe 410 is made of wear-resistant material to ensure the service life of the protective pipe 410.

[0054] Specifically, the protective pipe 410 can be made of stainless steel. The stainless steel has good wear resistance and corrosion resistance.

[0055] The shape and number of the limiting piece 430 are not limited in the embodiments of the present application. The limiting piece 430 can abut against the end surface of the inlet pipe plate 200 facing the first chamber 110. For example, the number of the limiting piece 430 can be multiple. The multiple limiting pieces 430 are sequentially and spacedly arranged in the circumferential direction of the protective pipe 410. The number of the limiting piece 430 can be one. The one limiting piece 430 can be block-shaped, plate-shaped, or even rod-shaped perpendicular to the axial direction of the protective pipe 410. When the one limiting piece 430 is block-shaped or rod-shaped, the limiting piece 430 is arranged on one side of the protective pipe 410 in the circumferential direction. When the one limiting piece 430 is plate-shaped, the one plate-shaped limiting piece 430 can be arranged on one side of the protective pipe 410 in the circumferential direction or around the protective pipe 410.

[0056] For example, the limiting piece 430 can be welded on the protective pipe 410. For the plate-shaped limiting piece 430, the limiting piece 430 can be a flange on the protective pipe 410.

[0057] Referring to Figure 4 For example, the inner diameters of the portions of the heat exchange pipe 300 inserted into the protective pipe 410 can be the same. The protective pipe 410 is fixed in the heat exchange pipe 300 by abutting between the elastic piece 420 and the heat exchange pipe 300.

[0058] Referring to Figure 1 The orientation of the first end of the heat exchange pipe 300 relative to the ground is not limited in the embodiments of the present application. The orientation of the first end of the heat exchange pipe 300 can be upward relative to the ground, downward relative to the ground, or horizontal relative to the ground. In actual use, the orientation is mostly upward or horizontal.

[0059] Referring to Figures 1 to 4The first fluid flows into the first chamber 110 and the second fluid flows into the second chamber 120. The first fluid flows into the first end of the heat exchange tube 300 and exchanges heat with the second fluid in the second chamber 120 through the heat exchange tube 300. The protective tube 410 is arranged to resist the erosion of the first fluid, so as to avoid the first fluid directly eroding the inner wall near the nozzle of the first end of the heat exchange tube 300, thereby solving the problem that the nozzle of the heat exchange tube 300 in the shell-and-tube heat exchanger is easily eroded. The protective tube 410 is fixed in the heat exchange tube 300 by the abutment of the elastic member 420 and the inner wall of the heat exchange tube 300 and the abutment of the limiting member 430 and the end face of the inlet tube plate 200 facing the first chamber 110, so as to avoid the movement of the protective tube 410 when the first fluid impacts the protective tube 410.

[0060] With reference to Figure 5 In some embodiments, the number of elastic members 420 is multiple, and the multiple elastic members 420 are sequentially and spacedly arranged along the circumferential direction of the protective tube 410. The protective tube 410 is fixed in the heat exchange tube 300 by the multiple elastic members 420, thereby facilitating the enhancement of the connection firmness of the protective tube 410 in the heat exchange tube 300.

[0061] For example, the elastic member 420 can be a metal spring piece, which can be connected to the outer wall of the protective tube 410 by welding.

[0062] In some embodiments, the elastic member 420 is an elastic protrusion.

[0063] For example, the elastic protrusion can be made of flexible materials such as silica gel or rubber, and the silica gel or rubber elastic protrusion can be pasted to the outer wall of the protective tube 410 by glue.

[0064] With reference to Figure 1 and Figure 5 The silica gel or rubber elastic protrusion is elastically deformed due to the extrusion of the outer wall of the protective tube 410 and the inner wall of the heat exchange tube 300, thereby generating a certain elastic force, which facilitates the enhancement of the abutment effect.

[0065] With reference to Figures 1 to 3 In some embodiments, the elastic member 420 is an elastic ring sleeved on the protective tube 410.

[0066] The elastic ring abuts the protective tube 410 in the heat exchange tube 300 around the protective tube 410, thereby facilitating the uniform force around the protective tube 410. The elastic ring is convenient to install on the outer wall of the protective tube 410.

[0067] For example, the elastic ring is a ring-shaped metal spring piece.

[0068] Exemplarily, the elastic ring can be made of flexible and sealing material such as silica gel or rubber. The elastic ring is sealed with the inner wall of the heat exchange pipe 300 to avoid the first fluid flowing from the gap between the protection pipe 410 and the heat exchange pipe 300, so as to better protect the inner wall of the heat exchange pipe 300.

[0069] With reference to Figures 1 to 3 In some embodiments, the outer diameter of the elastic ring gradually increases from the first end 421 of the elastic ring to the second end 422 of the elastic ring, and the second end 422 of the elastic ring is towards the first chamber 110.

[0070] Exemplarily, during the processing, the elastic ring can be first fixed to the outer wall of the protection pipe 410, and then the protection pipe 410 with the elastic ring is inserted into the heat exchange pipe 300. It can be understood that, since the outer diameter of the elastic ring gradually increases from the first end 421 of the elastic ring to the second end 422 of the elastic ring, when the elastic ring is inserted into the heat exchange pipe 300 with the protection pipe 410, the heat exchange pipe 300 first contacts the first end 421 of the elastic ring, and then contacts the second end 422 of the elastic ring, so that the elastic ring is gradually extruded and elastically deformed, to facilitate the insertion of the elastic ring into the heat exchange pipe 300 with the protection pipe 410, and facilitate the assembly work.

[0071] With reference to Figure 3 and Figure 6 In some embodiments, the outer wall of the protection pipe 410 has an annular groove 411, the elastic ring is arranged in the annular groove 411, and part of the elastic ring is located outside the annular groove 411.

[0072] It can be understood that, by arranging the annular groove 411, the elastic ring is facilitated to be installed.

[0073] Exemplarily, the elastic ring can be pasted in the annular groove 411 to further enhance the connection strength of the protection pipe 410 in the heat exchange pipe 300.

[0074] With reference to Figures 1 to 3 In some embodiments, the heat exchange pipe 300 includes a first insertion section 310, which is inserted on the inlet pipe plate 200; the first insertion section 310 includes a first sub-section 311, a transition sub-section 312 and a second sub-section 313 connected coaxially in sequence from the first chamber 110 to the second chamber 120, the inner diameter of the first sub-section 311 is smaller than the inner diameter of the second sub-section 313, and the inner diameter of the transition sub-section 312 gradually increases from the first sub-section 311 to the second sub-section 313; the inner wall of the first sub-section 311 abuts against the outer wall of the protection pipe 410, and the elastic member 420 abuts against the inner wall of the transition sub-section 312.

[0075] It can be understood that, because the elastic member 420 abuts against the inner wall of the transition sub-section 312, the inner diameter of the transition sub-section 312 gradually increases from the first sub-section 311 to the second sub-section 313, and therefore the outer diameter of the elastic member 420 is greater than the inner diameter of the first sub-section 311, which can prevent the protective tube 410 inserted into the heat exchange tube 300 from moving towards the first chamber 110, and in combination with the abutment between the limiting member 430 and the inlet tube plate 200, the protective tube 410 is fixed on the heat exchange tube 300.

[0076] For example, when assembling the protective assembly 400 to the heat exchange tube 300, the elastic member 420 can be first fixed to the outer wall of the protective tube 410, and then the protective tube 410 is inserted into the heat exchange tube 300. In specific implementation, the outer wall of the protective tube 410 can be provided with a pit, a groove or an annular groove, and the elastic member 420 is arranged in the corresponding pit, groove or annular groove. When the elastic member 420 is subjected to extrusion force, it can hide in the corresponding pit, groove or annular groove. When the elastic member 420 passes through the first sub-section 311, it is extruded and hidden in the corresponding pit, groove or annular groove by the first sub-section 311, and the elastic member can rebound when it reaches the transition sub-section 312.

[0077] Referring to Figure 1 and Figure 2 In addition, the inlet tube plate 200 has at least one tube plate hole, the first sub-section 311 and the second sub-section 313 are inserted into the inlet tube plate 200 through the tube plate hole, the outer wall of the second sub-section 313 abuts against the inner wall of the tube plate hole, and the first sub-section 311 and the tube plate hole have a gap therebetween, and the gap is provided with a weld layer 210, which is flush with one end of the inlet tube plate 200 facing the first chamber 110.

[0078] It should be noted that when the first fluid is introduced into the first chamber 110 in the shell 100, the first fluid will flush the joint between the heat exchange tube 300 and the inlet tube plate 200, which is easy to cause erosion of the joint. By providing the gap and the weld layer 210 in the gap (i.e., the joint), the thickness and width of the weld layer 210 are increased, thereby enhancing the anti-erosion capability of the joint between the heat exchange tube 300 and the inlet tube plate 200, and also enhancing the connection strength between the heat exchange tube 300 and the inlet tube plate 200.

[0079] Referring to Figures 1 to 5 Further, the limiting member 430 is a baffle arranged around the protective tube 410, and the baffle covers the weld layer 210.

[0080] The shape of the baffle arranged around the protective tube 410 is not specifically limited in the embodiments of the present application. For example, the outer contour of the baffle can be rectangular or circular.

[0081] In the embodiment, the outer contour of the baffle arranged on the protection tube 410 is circular, and the baffle can be a flange or a circular ring welded on the protection tube 410.

[0082] It can be understood that the baffle 430 arranged on the protection tube 410 protects the weld layer 210 from being washed by the first fluid, avoids the first fluid from corroding the weld, and improves the service life of the anti-corrosion tubular heat exchanger.

[0083] Referring to Figure 2 and Figure 6 , for example, the protection assembly 400 further includes a sealing gasket 440 arranged on the side of the baffle 430 facing the inlet tube plate 200, and the sealing gasket 440 is used to abut against the end surface of the inlet tube plate 200 facing the first chamber 110. The sealing gasket 440 can be made of rubber or silicone.

[0084] It can be understood that the sealing gasket 440 seals the end surface of the weld layer 210, which is particularly beneficial to avoid the weld layer from contacting the liquid phase and being corroded by the liquid phase, and is beneficial to further protecting the weld layer.

[0085] Referring to Figure 1 and Figure 2 In addition, the anti-corrosion tubular heat exchanger further includes an outlet tube plate 500 arranged in the shell 100, the second chamber 120 is located between the inlet tube plate 200 and the outlet tube plate 500, the heat exchange tube 300 further includes a transition section 320 and a second plug-in section 330, the first end of the transition section 320 is coaxially connected with the second sub-section 313, the second end of the transition section 320 is coaxially connected with the second plug-in section 330, the second plug-in section 330 is plugged into the outlet tube plate 500, and the protection tube 410 at least partially extends into the transition section 320 from the transition section 320.

[0086] It should be noted that the outlet tube plate 500 is in the form of a plate, and the outlet tube plate 500 is used to fix the second plug-in section 330 in the shell 100. The shape of the outlet tube plate 500 and the connection mode between the outlet tube plate 500 and the shell 100 are not limited in the embodiment. For example, the shape of the outlet tube plate 500 is consistent with the cross section of the inner cavity of the shell 100, and the outlet tube plate 500 is welded in the shell 100.

[0087] The material of the outlet tube plate 500 is not limited in the embodiment, and for example, the material of the outlet tube plate is usually metal, such as stainless steel. The stainless steel has strong corrosion resistance and strength.

[0088] Exemplarily, the outer wall of the protection tube 410 abuts against the inner wall of the transition section 320. The protection tube 410 extends at least partially into the transition section 320 from the transition section 320, so that the protection tube 410 is in contact with the inner wall of the heat exchange tube 300 near the tube opening of the protection heat exchange tube 300, and further enhances the stability of the connection of the protection tube 410 in the heat exchange tube 300.

[0089] It can be understood that the first chamber 110 is used for introducing the first fluid, and the second chamber 120 is used for introducing the second fluid. When the first fluid flows through the heat exchange tube 300, heat is transferred between the heat exchange tube and the second fluid.

[0090] Exemplarily, the shell 100 is provided with a first interface for introducing the first fluid into the first chamber 110; the shell 100 is also provided with an interface for circulating the second fluid in the second chamber 120, and the shell 100 is also provided with a third interface for leading the first fluid out of the shell. These interfaces on the shell 100 belong to the prior art, and will not be described here.

[0091] The application also provides a polysilicon production system.

[0092] The polysilicon production system comprises a polysilicon reactor and the above-mentioned corrosion-resistant shell-and-tube heat exchanger connected with the polysilicon reactor.

[0093] Exemplarily, the polysilicon reactor can be a fluidized bed reactor for producing polysilicon.

[0094] Exemplarily, the fluidized bed reactor for producing polysilicon continuously discharges a hot gas stream during operation. The fluidized bed reactor for producing polysilicon is connected with the corrosion-resistant shell-and-tube heat exchanger, so as to introduce the hot gas stream (first fluid) discharged by the fluidized bed reactor for producing polysilicon into the heat exchange tube 300, so as to transfer heat between the heat exchange tube 300 and the second fluid (medium) in the second chamber 120, so as to absorb heat in the hot gas stream by the second fluid for reuse.

[0095] It should be noted that the hot gas stream discharged by the polysilicon reactor contains polysilicon particulate matter.

[0096] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0097] It is to be understood that the application is not limited to the precise construction already described above and shown in the drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application should only be limited by the claims appended hereto.

Claims

1. A tube and shell heat exchanger resistant to erosion, characterized in that, The application relates to a heat exchanger. The heat exchanger comprises: a shell (100); an inlet tube plate (200) arranged in the shell (100) and separating the shell (100) into a first chamber (110) for introducing a first fluid and a second chamber (120) for containing a second fluid; at least one heat exchange tube (300) arranged in the second chamber (120), the heat exchange tube (300) being partially inserted on the inlet tube plate (200), and a first end of the heat exchange tube (300) being in communication with the first chamber (110); 2. The fouling- resistant tube-in-shell heat exchanger of claim 1, wherein, at least one protection assembly (400) comprising a protection tube (410), an elastic member (420) and a limiting member (430), the protection tube (410) being inserted in the heat exchange tube (300) through a corresponding first end of the heat exchange tube (300), the elastic member (420) being arranged on an outer wall of the protection tube (410) and abutting against an inner wall of the heat exchange tube (300), and the limiting member (430) being arranged at an end of the protection tube (410) facing the first chamber (110) and abutting against an end face of the inlet tube plate (200) facing the first chamber (110), so that the protection tube (410) is fixed in the heat exchange tube (300) by the elastic member (420) and the limiting member (430).

3. The fouling- resistant tube-in-shell heat exchanger of claim 1, wherein, The elastic member (420) is in the form of a plurality of elastic rings arranged along a circumferential direction of the protection tube (410).

4. The fouling- resistant tube-in-shell heat exchanger of claim 3, wherein, The elastic member (420) is in the form of an elastic ring sleeved on the protection tube (410).

5. The fouling- resistant tube-in-shell heat exchanger of claim 3, wherein, An outer diameter of the elastic ring gradually increases from a first end of the elastic ring to a second end of the elastic ring, and the second end of the elastic ring faces the first chamber (110).

6. The fouling- resistant tube-in-shell heat exchanger of any one of claims 1 to 5, wherein, An outer wall of the protection tube (410) has an annular groove, the elastic ring is arranged in the annular groove, and part of the elastic ring is located outside the annular groove. The heat exchange tube (300) comprises a first insertion section (310) inserted on the inlet tube plate (200), the first insertion section (310) sequentially comprises a first sub-section (311), a transition sub-section (312) and a second sub-section (313) coaxially connected from the first chamber (110) to the second chamber (120), an inner diameter of the first sub-section (311) is smaller than an inner diameter of the second sub-section (313), and the inner diameter of the transition sub-section (312) gradually increases from the first sub-section (311) to the second sub-section (313). An inner wall of the first sub-section (311) abuts against an outer wall of the protection tube (410), and the elastic member (420) abuts against an inner wall of the transition sub-section (312).

7. The fouling- resistant tube-in-shell heat exchanger of claim 6, wherein, The inlet tube plate (200) has at least one tube plate hole, the first sub-section (311) and the second sub-section (313) are inserted into the inlet tube plate (200) through the tube plate hole, the outer wall of the second sub-section (313) abuts against the inner wall of the tube plate hole, a gap is formed between the first sub-section (311) and the tube plate hole, and a weld layer (210) is arranged in the gap, the weld layer (210) is flush with one end of the inlet tube plate (200) facing the first chamber (110).

8. The fouling- resistant tube-in-shell heat exchanger of claim 7, wherein, The limiting piece (430) is a baffle arranged around the protective tube (410), and the baffle covers the weld layer (210).

9. The fouling- resistant tube-in-shell heat exchanger of claim 8, wherein, The outlet tube plate (500) is further included, the outlet tube plate (500) is arranged in the shell (100), the second chamber (120) is located between the inlet tube plate (200) and the outlet tube plate (500), the heat exchange tube (300) further includes a transition section (320) and a second insertion section (330), the first end of the transition section (320) is coaxially connected with the second sub-section (313), the second end of the transition section (320) is coaxially connected with the second insertion section (330), and the second insertion section (330) is inserted into the outlet tube plate (500); The protective tube (410) extends at least partially into the transition section (320) from the transition section (320).

10. A polycrystalline silicon production system, characterized in that, A multi-crystalline silicon reactor and a tube-shell heat exchanger resistant to erosion as claimed in any one of claims 1 to 9 connected with the multi-crystalline silicon reactor are included.

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