Steam generator for high-temperature gas cooled reactor

Abstract

The invention belongs to the technical field of nuclear power generation, and discloses a steam generator for a high-temperature gas cooled reactor, a heat preservation layer is annularly arranged between a heat transfer assembly and the inner wall of a shell, a helium inlet pipe penetrates through the heat preservation layer, a helium outlet pipe is communicated with a turn-back gap between the shell and the heat preservation layer, and the heat transfer assembly comprises a low-temperature pipe set, a header and a high-temperature pipe set; a low-temperature pipe group outlet is communicated with the header; a high-temperature pipe group inlet is communicated with the header; a high-temperature pipe group outlet is communicated with the steam pipe; the high-temperature pipe group is close to the helium inlet pipe; high-temperature helium sequentially exchanges heat with water in the high-temperature pipe set and water in the low-temperature pipe set through the helium inlet pipe, enters the turn-back gap through the notch, flows upwards and flows out of the shell through the helium outlet pipe, water exchanges heat with the high-temperature helium in the low-temperature pipe set to form micro-superheated steam, and the micro-superheated steam enters the header to be mixed so as to weaken the temperature deviation of outlet steam. And then the steam enters the high-temperature pipe group and exchanges heat with high-temperature helium to form high-temperature steam which flows out of the shell.

Description

A steam generator for a high-temperature gas-cooled reactor Technical Field

[0001] This invention relates to the field of nuclear power generation technology, and in particular to a steam generator for a high-temperature gas-cooled reactor. Background Technology

[0002] High-temperature gas-cooled reactors (HTGRs) use helium as the primary coolant. The outlet helium temperature can reach 750°C, and the pressure can reach 7 MPaG. The outlet helium is fed into a steam generator to produce high-temperature, high-pressure steam that drives a turbine to generate electricity. Currently, the mainstream direct-current steam generators adopt a counter-current arrangement, with the direct-current steam generator and the main helium blower integrated into one unit, which has been well applied in HTGRs.

[0003] However, the DC steam generator has the following technical problems: On the one hand, the helium flow on the primary side is affected by the non-uniformity of the flow channel, which can easily cause uneven flow distribution. On the other hand, throttling components are usually installed on the secondary side to control the uniformity of water flow, but the orifice of the throttling component is very small and has extremely high requirements for water quality. During operation, the orifice of the throttling component is easily blocked, causing uneven flow distribution. The above two points cause the outlet steam temperature of each heat exchange tube of the DC steam generator to be uneven, and the outlet steam temperature has a deviation. When the outlet steam temperature deviation is too large, it will seriously endanger the safe operation of the steam outlet tube sheet. Summary of the Invention

[0004] The purpose of this invention is to provide a steam generator for a high-temperature gas-cooled reactor that can reduce the temperature deviation of the outlet steam.

[0005] To achieve this objective, the present invention adopts the following technical solution: a steam generator for a high-temperature gas-cooled reactor, comprising: a shell, wherein the shell is connected to a helium inlet pipe, a helium outlet pipe, a water inlet pipe, and a steam pipe; a heat transfer assembly, wherein a heat transfer assembly is provided with an insulation layer between the heat transfer assembly and the inner wall of the shell, the helium inlet pipe penetrates the insulation layer, the helium outlet pipe is connected to the folding gap between the inner wall of the shell and the insulation layer, the heat transfer assembly includes a low-temperature pipe assembly, a header, and a high-temperature pipe assembly, wherein the inlet of the low-temperature pipe assembly is connected to the water inlet pipe, the outlet of the low-temperature pipe assembly is connected to the header, the inlet of the high-temperature pipe assembly is connected to the header, the outlet of the high-temperature pipe assembly is connected to the steam pipe, and a gap is provided in the area of ​​the insulation layer near the low-temperature pipe assembly, and the high-temperature pipe assembly is closer to the helium inlet pipe than the low-temperature pipe assembly.

[0006] Preferably, the inner cavity of the manifold is provided with a gas guide pipe, the end of the gas guide pipe is spaced apart from the end of the manifold, the bottom end of the gas guide pipe is circumferentially fixed to the inner wall of the manifold, the outlet of the low temperature tube group is connected to the bottom end of the gas guide pipe, and the inlet of the high temperature tube group is connected to the gap formed between the outer wall of the gas guide pipe and the inner wall of the manifold.

[0007] Preferably, the end of the helium inlet pipe that penetrates the insulation layer is connected to a uniform distribution box, and the uniform distribution box has a number of distribution holes evenly spaced on the side away from the insulation layer.

[0008] Preferably, the helium outlet pipe is sleeved on the outside of the helium inlet pipe.

[0009] Preferably, the folding gap is sealed with an annular partition, which is located below the helium outlet pipe. A helium blower is installed at one end inside the housing, which is located above the helium outlet pipe. Several guide pipes are provided on the partition, with the bottom end of the guide pipes penetrating the partition and the top end of the guide pipes connected to the inlet of the helium blower. The outlet of the helium blower is connected to the folding gap.

[0010] Preferably, the housing includes a straight pipe section, an upper end cap, and a lower end cap. The upper end cap is installed at the top of the straight pipe section, and the lower end cap is installed at the bottom of the straight pipe section. The helium blower is located at the upper end cap, the water inlet pipe is connected to the lower end cap, and the helium inlet pipe, the helium outlet pipe, and the steam pipe are connected to the end of the straight pipe section near the upper end cap.

[0011] Preferably, a tube sheet is installed at one end of the straight pipe section near the lower end cap, the tube sheet is circumferentially sealed to the inner wall of the straight pipe section, the cryogenic pipe assembly is sealed through and fixed to the tube sheet, an intermediate cylinder is provided on the tube sheet, and the intermediate cylinder supports the header.

[0012] Preferably, the intermediate cylinder has several balancing holes.

[0013] Preferably, the lower end cap has a manhole.

[0014] Preferably, the system also includes a first discharge pipe and a second discharge pipe. The first discharge pipe is connected to the bottom of the manifold, and the other end of the first discharge pipe extends out of the housing. One end of the second discharge pipe is connected to the gap formed between the outer wall of the vent pipe and the inner wall of the manifold, and the other end of the second discharge pipe is connected to the first discharge pipe.

[0015] The beneficial effects of this invention are as follows: This invention provides a steam generator for a high-temperature gas-cooled reactor, comprising a shell and a heat transfer assembly. The shell is connected to a helium inlet pipe, a helium outlet pipe, a water inlet pipe, and a steam pipe. A heat insulation layer is provided between the heat transfer assembly and the inner wall of the shell. The helium inlet pipe penetrates the heat insulation layer, and the helium outlet pipe connects to the folding gap between the inner wall of the shell and the heat insulation layer. The heat transfer assembly includes a low-temperature tube group, a header, and a high-temperature tube group. The inlet of the low-temperature tube group is connected to the water inlet pipe, and the outlet of the low-temperature tube group is connected to the header. The inlet of the high-temperature tube group is connected to the header, and the outlet of the high-temperature tube group is connected to the steam pipe. A gap is provided in the area of ​​the heat insulation layer near the low-temperature tube group, and the high-temperature tube group is closer to the helium inlet pipe than the low-temperature tube group. High-temperature helium flowing out of the high-temperature gas-cooled reactor enters the helium inlet pipe and first reacts with the high-temperature tube group... The water undergoes initial cooling and then flows downwards to exchange heat with the water in the cryogenic tube assembly. After secondary cooling to approximately 250°C, it then turns back 180 degrees through a gap and enters the reversal gap, flowing upwards. It then exits the shell through the helium outlet pipe and flows through the water inlet pipe to several heat exchange tubes in the cryogenic tube assembly. The water exchanges heat with the high-temperature helium in the cryogenic tube assembly and evaporates to form slightly superheated steam. The slightly superheated steam enters the header, mixes, and then enters several heat exchange tubes in the high-temperature tube assembly. After exchanging heat with the high-temperature helium in the high-temperature tube assembly, it evaporates to form high-temperature steam. The high-temperature steam enters the steam pipe through the outlet of several heat exchange tubes in the high-temperature tube assembly and flows out of the shell. The header connects the cryogenic and high-temperature tube assemblies, and the slightly superheated steam is mixed in the header to reduce the temperature deviation of the outlet steam. Attached Figure Description

[0016] Figure 1 is a cross-sectional view of a steam generator for a high-temperature gas-cooled reactor provided in an embodiment of the present invention; Figure 2 is a structural schematic diagram of a manifold provided in an embodiment of the present invention.

[0017] In the diagram: 1. Shell; 101. Straight pipe section; 102. Upper head; 103. Lower head; 1031. Manhole; 11. Helium inlet pipe; 12. Helium outlet pipe; 13. Water inlet pipe; 14. Steam pipe; 15. Insulation layer; 16. Bend-back gap; 161. Partition plate; 162. Flow guide pipe; 17. Distribution box; 171. Distribution hole; 18. Helium blower; 19. Tube sheet; 1a. Intermediate cylinder; 1a1. Balance hole; 21. Cryogenic tube assembly; 22. Manifold; 221. Gas guide pipe; 222. Connecting plate; 23. High-temperature tube assembly; 24. First discharge pipe; 25. Second discharge pipe. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0019] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0022] This embodiment provides a steam generator for a high-temperature gas-cooled reactor, which can reduce the temperature deviation of the outlet steam by mixing the steam.

[0023] Please refer to Figures 1 and 2. The steam generator for a high-temperature gas-cooled reactor provided in this embodiment includes a shell 1 and a heat transfer component. The heat transfer component is arranged inside the shell 1. Water flows through the heat transfer component. The water in the heat transfer component absorbs the heat of the high-temperature helium gas flowing out of the high-temperature gas-cooled reactor to form high-temperature steam, which drives the steam turbine to generate electricity.

[0024] Specifically, please refer to Figure 1. The shell 1 is connected to the helium inlet pipe 11, the helium outlet pipe 12, the water inlet pipe 13, and the steam pipe 14. The high-temperature helium flowing out of the high-temperature gas-cooled reactor is introduced into the helium inlet pipe 11. After exchanging heat with the water in the heat transfer components, it is cooled to about 250°C. Then it flows out of the shell 1 through the helium outlet pipe 12. Water is introduced into the heat transfer components through the water inlet pipe 13. After exchanging heat with the high-temperature helium, it evaporates to form high-temperature steam. Then it flows out of the shell 1 through the steam pipe 14 and drives the steam turbine to generate electricity.

[0025] Optionally, referring to Figure 1, the casing 1 includes a straight pipe section 101, an upper end cap 102, and a lower end cap 103. The upper end cap 102 is installed at the top of the straight pipe section 101, and the lower end cap 103 is installed at the bottom of the straight pipe section 101. A water inlet pipe 13 connects to the lower end cap 103. A helium inlet pipe 11, a helium outlet pipe 12, and a steam pipe 14 are connected to the end of the straight pipe section 101 near the upper end cap 102. With the above arrangement, the high-temperature helium flowing out of the high-temperature gas-cooled reactor enters the helium inlet pipe 11, and after exchanging heat with the water in the heat transfer components, it is cooled to about 250°C. Then, it turns back 180 degrees and flows upward, exiting the casing 1 through the helium outlet pipe 12, thereby improving the utilization rate of the heat of the high-temperature helium.

[0026] Preferably, as shown in Figure 1, a manhole 1031 is provided in the lower end cap 103 to facilitate equipment maintenance.

[0027] Specifically, referring to Figure 1, the heat transfer assembly is arranged in the straight pipe section 101 and includes a low-temperature tube assembly 21, a header 22, and a high-temperature tube assembly 23. Both the low-temperature tube assembly 21 and the high-temperature tube assembly 23 include several heat exchange tubes. The inlets of several heat exchange tubes in the low-temperature tube assembly 21 are connected to the water inlet pipe 13, and the outlets of several heat exchange tubes in the low-temperature tube assembly 21 are connected to the header 22. The inlets of several heat exchange tubes in the high-temperature tube assembly 23 are connected to the header 22, and the outlets of several heat exchange tubes in the high-temperature tube assembly 23 are connected to the steam pipe 14. Furthermore, the high-temperature tube assembly 23 is closer to the helium inlet pipe 11 than the low-temperature tube assembly 21. That is, the high-temperature tube assembly 23 is arranged in the region of the straight pipe section 101 near the upper end cap 102, and the low-temperature tube assembly 21 is arranged in the region of the straight pipe section 101 near the lower end cap 103.

[0028] With the above configuration, water is supplied to several heat exchange tubes in the low-temperature tube group 21 through the water inlet pipe 13. After exchanging heat with high-temperature helium in the low-temperature tube group 21, the water evaporates to form slightly superheated steam. The slightly superheated steam enters the header 22, mixes, and then enters several heat exchange tubes in the high-temperature tube group 23. After exchanging heat with high-temperature helium in the high-temperature tube group 23, the steam evaporates to form high-temperature steam. The steam is then supplied to the steam pipe 14 through the outlet of several heat exchange tubes in the high-temperature tube group 23 and flows out of the casing 1, further driving the steam turbine to generate electricity.

[0029] In this embodiment, a header 22 is set up to connect the low-temperature pipe group 21 and the high-temperature pipe group 23. The slightly superheated steam is mixed in the header 22, thereby reducing the temperature deviation of the outlet steam.

[0030] Please refer to Figures 1 and 2. In this embodiment, a gas guide pipe 221 is also provided inside the header 22 to improve the mixing effect of slightly superheated steam. For example, the gas guide pipe 221 is coaxially arranged inside the header 22. The upper and lower ends of the gas guide pipe 221 are spaced apart from the ends of the header 22. The bottom end of the gas guide pipe 221 is circumferentially sealed and fixed to the inner wall of the header 22 by a connecting plate 222. The outlets of several heat exchange tubes in the low-temperature tube group 21 are all connected to the bottom of the header 22 and introduced into the gas guide pipe 221 through the bottom end of the gas guide pipe 221. The inlets of several heat exchange tubes in the high-temperature tube group 23 are all connected to the gap formed between the outer wall of the gas guide pipe 221 and the inner wall of the header 22. Several through holes are opened in the header 22, and the several through holes are connected to several inlets of the high-temperature tube group 23 one by one.

[0031] With the above configuration, the outlets of several heat exchange tubes in the low-temperature tube assembly 21 allow slightly superheated steam to enter the bottom of the header 22. The slightly superheated steam is introduced into the gas guide pipe 221 from the bottom end, where it is collected and thoroughly mixed. The steam is then introduced into the gap formed between the outer wall of the gas guide pipe 221 and the inner wall of the header 22 from the top end of the gas guide pipe 221, and then passes through several through holes in the header 22 to the inlets of several heat exchange tubes in the high-temperature tube assembly 23. This not only improves the mixing effect of the slightly superheated steam, but also improves the uniform flow effect of the slightly superheated steam entering the high-temperature tube assembly 23, further reducing the temperature deviation of the outlet steam.

[0032] Please refer to Figure 1. In this embodiment, a tube sheet 19 is also installed at one end of the straight pipe section 101 near the lower end cap 103. The tube sheet 19 is circumferentially sealed to the inner wall of the straight pipe section 101. The inlet seal of the low temperature tube assembly 21 passes through and is fixed on the tube sheet 19. An intermediate cylinder 1a is provided on the tube sheet 19. The top of the intermediate cylinder 1a supports the header 22 to ensure the structural stability of the heat transfer assembly.

[0033] Optionally, several balance holes 1a1 are opened on the intermediate cylinder 1a to connect to the interior of the shell 1, so as to ensure that the internal pressure of the intermediate cylinder is balanced with the internal pressure of the shell 1.

[0034] Please refer to Figures 1 and 2. In this embodiment, a first discharge pipe 24 and a second discharge pipe 25 are also provided. During maintenance, the material in the manifold 22 can be discharged out of the housing 1 through the first discharge pipe 24 and the second discharge pipe 25. Specifically, the first discharge pipe 24 is connected to the bottom of the manifold 22, and the other end of the first discharge pipe 24 passes through the tube sheet 19 and extends out of the lower end cap 103. That is, the other end of the discharge pipe extends out of the housing 1. One end of the second discharge pipe 25 is connected to the gap formed between the outer wall of the air guide pipe 221 and the inner wall of the manifold 22, and the other end of the second discharge pipe 25 is connected to the first discharge pipe 24.

[0035] Further, referring to Figure 1, a heat insulation layer 15 is provided around the heat transfer component and the inner wall of the housing 1. A folding gap 16 is formed between the inner wall of the housing 1 and the heat insulation layer 15. The helium inlet pipe 11 penetrates the heat insulation layer 15 so that the high-temperature helium can directly contact the heat transfer component. Furthermore, the heat insulation layer 15 is provided with a notch, and the helium outlet pipe 12 is connected to the aforementioned folding gap 16.

[0036] Preferably, the insulation layer 15 is arranged in a ring between the heat transfer component and the inner wall of the straight pipe section 101.

[0037] Preferably, the notch is located in the area of ​​the insulation layer 15 near the low-temperature tube assembly 21.

[0038] With the above setup, the high-temperature helium gas flowing out of the high-temperature gas-cooled reactor enters the helium inlet pipe 11, first exchanging heat with the water in the high-temperature tube assembly 23. After initial cooling, it flows downwards to exchange heat with the water in the low-temperature tube assembly 21. After secondary cooling, it reaches approximately 250°C, then turns back 180 degrees through a gap into the turning gap 16 and flows upwards. Finally, it flows out of the shell 1 through the helium outlet pipe 12, thereby improving the utilization rate of the heat from the high-temperature helium. In summary, the high-temperature helium and water form a counter-current flow. Water is introduced into the low-temperature tube assembly 21 through the water inlet pipe 13. In the low-temperature tube assembly 21, water exchanges heat with the initially cooled high-temperature helium and evaporates to form slightly superheated steam. The slightly superheated steam enters the header 22, mixes, and then enters the high-temperature tube assembly 23. In the high-temperature tube assembly 23, water exchanges heat with the uncooled high-temperature helium and evaporates to form high-temperature steam.

[0039] In this embodiment, a helium outlet pipe 12 is sleeved on the outside of the helium inlet pipe 11. Preferably, the helium outlet pipe 12 and the helium inlet pipe 11 are coaxial. The high-temperature helium flowing out of the high-temperature gas-cooled reactor, and the cooled helium after secondary cooling, flows out through the annular gap between the helium outlet pipe 12 and the helium inlet pipe 11. With the above arrangement, the helium outlet pipe 12 can insulate the helium inlet pipe 11, reduce the heat loss of the high-temperature helium, improve the utilization rate of the heat of the high-temperature helium, and the structure is simple.

[0040] Further, referring to Figure 1, the end of the helium inlet pipe 11 that penetrates the insulation layer 15 is connected to the distribution box 17. The distribution box 17 has several distribution holes 171 evenly spaced on the side away from the insulation layer 15. By setting up the distribution box 17, the high-temperature helium introduced by the helium inlet pipe 11 is first buffered in the distribution box 17, and the flow rate is evenly distributed through the distribution holes 171, optimizing the uniform flow effect of the high-temperature helium, reducing the temperature deviation of the high-temperature helium, and achieving uniform heat exchange with the heat exchange components.

[0041] Furthermore, referring to Figure 1, an annular partition 161 is sealed in the folding gap 16. That is, the inner circumferential ring of the partition 161 is connected to the insulation layer 15, and the outer circumferential ring of the partition 161 is connected to the inner wall of the shell 1. The partition 161 is located below the helium outlet pipe 12. A helium blower 18 is installed at one end inside the shell 1. That is, the helium blower 18 is located above the helium outlet pipe 12. In this embodiment, the helium blower 18 is set on the upper end cap 102, and several guide pipes 162 are set on the partition 161. The bottom end of the guide pipe 162 penetrates the partition 161, the top end of the guide pipe 162 is connected to the inlet of the helium blower 18, and the outlet of the helium blower 18 is connected to the folding gap 16.

[0042] With the above setup, the high-temperature helium gas flowing out of the high-temperature gas-cooled reactor enters the helium gas inlet pipe 11, first exchanges heat with the water in the high-temperature tube group 23, and after initial cooling, flows downward to exchange heat with the water in the low-temperature tube group 21. After secondary cooling, it reaches about 250°C, and then turns back 180 degrees through the gap to enter the turning gap 16, and flows upward. After that, it enters the helium blower 18 through the guide pipe 162, and after being pressurized by the helium blower 18, it re-enters the turning gap 16, and then flows out of the shell 1 through the helium gas outlet pipe 12.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A steam generator for a high-temperature gas-cooled reactor, characterized in that, include: A housing (1) is connected to a helium inlet pipe (11), a helium outlet pipe (12), a water inlet pipe (13), and a steam pipe (14); a heat transfer assembly is provided with an insulation layer (15) between the heat transfer assembly and the inner wall of the housing (1), the helium inlet pipe (11) penetrates the insulation layer (15), and the helium outlet pipe (12) connects to the folding gap (16) between the inner wall of the housing (1) and the insulation layer (15). The heat transfer assembly includes a low-temperature pipe assembly (21) and a manifold (22). The inlet of the low-temperature pipe assembly (21) is connected to the water inlet pipe (13), the outlet of the low-temperature pipe assembly (21) is connected to the header (22), the inlet of the high-temperature pipe assembly (23) is connected to the header (22), the outlet of the high-temperature pipe assembly (23) is connected to the steam pipe (14), the insulation layer (15) has a gap in the area near the low-temperature pipe assembly (21), and the high-temperature pipe assembly (23) is closer to the helium inlet pipe (11) than the low-temperature pipe assembly (21).

2. A steam generator for a high-temperature gas-cooled reactor according to claim 1, characterized in that, The inner cavity of the manifold (22) is provided with a gas guide pipe (221). The end of the gas guide pipe (221) is spaced apart from the end of the manifold (22). The bottom end of the gas guide pipe (221) is circumferentially fixed to the inner wall of the manifold (22). The outlet of the low temperature tube group (21) is connected to the bottom end of the gas guide pipe (221). The inlet of the high temperature tube group (23) is connected to the gap formed between the outer wall of the gas guide pipe (221) and the inner wall of the manifold (22).

3. A steam generator for a high-temperature gas-cooled reactor according to claim 1, characterized in that, The helium inlet pipe (11) passes through the end of the insulation layer (15) and is connected to the distribution box (17). The distribution box (17) has a number of distribution holes (171) evenly spaced on the side away from the insulation layer (15).

4. A steam generator for a high-temperature gas-cooled reactor according to claim 1, characterized in that, The helium outlet pipe (12) is sleeved on the outside of the helium inlet pipe (11).

5. A steam generator for a high-temperature gas-cooled reactor according to claim 4, characterized in that, The reversal gap (16) is sealed with an annular partition (161). The partition (161) is located below the helium outlet pipe (12). A helium blower (18) is installed at one end inside the housing (1). The helium blower (18) is located above the helium outlet pipe (12). Several guide pipes (162) are provided on the partition (161). The bottom end of the guide pipe (162) passes through the partition (161). The top end of the guide pipe (162) is connected to the inlet of the helium blower (18). The outlet of the helium blower (18) is connected to the reversal gap (16).

6. A steam generator for a high-temperature gas-cooled reactor according to claim 5, characterized in that, The housing (1) includes a straight pipe section (101), an upper end cap (102), and a lower end cap (103). The upper end cap (102) is installed at the top of the straight pipe section (101), and the lower end cap (103) is installed at the bottom of the straight pipe section (101). The helium blower (18) is located on the upper end cap (102). The water inlet pipe (13) is connected to the lower end cap (103). The helium inlet pipe (11), the helium outlet pipe (12), and the steam pipe (14) are connected to the end of the straight pipe section (101) near the upper end cap (102).

7. A steam generator for a high-temperature gas-cooled reactor according to claim 6, characterized in that, A tube sheet (19) is installed at one end of the straight pipe section (101) near the lower end cap (103). The tube sheet (19) is circumferentially sealed to the inner wall of the straight pipe section (101). The cryogenic tube assembly (21) is sealed through and fixed to the tube sheet (19). An intermediate cylinder (1a) is provided on the tube sheet (19), and the intermediate cylinder (1a) supports the header (22).

8. A steam generator for a high-temperature gas-cooled reactor according to claim 7, characterized in that, The intermediate cylinder (1a) has several balance holes (1a1).

9. A steam generator for a high-temperature gas-cooled reactor according to claim 6, characterized in that, The lower end cap (103) has a manhole (1031).

10. A steam generator for a high-temperature gas-cooled reactor according to any one of claims 1-9, characterized in that, It also includes a first discharge pipe (24) and a second discharge pipe (25). The first discharge pipe (24) is connected to the bottom of the manifold (22), and the other end of the first discharge pipe (24) extends out of the housing (1). One end of the second discharge pipe (25) is connected to the gap formed between the outer wall of the air guide pipe (221) and the inner wall of the manifold (22), and the other end of the second discharge pipe (25) is connected to the first discharge pipe (24).

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