Helium inlet uniform device and system for steam generator of high temperature gas cooled reactor

Abstract

The application relates to a helium inlet uniform device and system of a steam generator of a high-temperature gas cooled reactor, which comprises a connecting cylinder, a gas outlet part, a helium inlet, a main steam pipe box and a helium flow guide cylinder. The helium inlet uniform device and system of the steam generator of the high-temperature gas cooled reactor is connected with one end of the cylinder body, helium enters the gas outlet part and then passes through multiple rows arranged along the axial direction of the cylinder body, and multiple first gas outlet holes of each row are uniformly arranged along the circumferential direction of the cylinder body, so that the helium is uniformly discharged from the gas outlet part into the top chamber, the helium flow in the steam generator of the high-temperature gas cooled reactor is uniformly distributed, and the temperature between the heat transfer pipes of the helium flow guide cylinder is uniformly ensured, meanwhile, the grid format structure of the gas outlet part reduces the helium flow speed, and the speed of the helium flow out of the gas outlet part is prevented from being too large to cause the helium to directly impact the main steam pipe box.

Description

Technical Field

[0001] The present invention relates to the field of high-temperature gas-cooled reactors, and in particular to a helium inlet uniformization device and system for a steam generator of a high-temperature gas-cooled reactor. Background Art

[0002] High-temperature gas-cooled reactors (HTGRs) are advanced nuclear reactors with broad application prospects, characterized by inherent safety, simplified systems, high power generation efficiency, continuous fuel loading and unloading, and modular construction. The steam generator (SG) in a HTGR is a key component for heat exchange between the primary and secondary sides, significantly impacting both reactor safety and economic efficiency.

[0003] However, during operation of a high-temperature gas-cooled reactor (HTGR) steam generator, the temperature distribution between the heat transfer tubes of different heat exchange components is uneven. This significant temperature nonuniformity can cause the temperature of some heat transfer tubes to exceed the design limit, potentially leading to rupture of these tubes and threatening reactor safety. Furthermore, the water / steam on the secondary side of the steam generator uses a once-through flow system, resulting in a very small heat capacity for the heat transfer tubes, especially in the superheat section. This makes the tubes highly sensitive to thermal hydraulic fluctuations. Uneven helium flow distribution in the primary circuit is a key factor contributing to temperature nonuniformity across the heat transfer tubes of these components. Summary of the Invention

[0004] Based on this, it is necessary to provide a helium inlet uniformity device and system for a steam generator of a high-temperature gas-cooled reactor to address the problem of uneven temperature between heat transfer tubes caused by uneven helium flow distribution in the first circuit of the steam generator of the high-temperature gas-cooled reactor.

[0005] An embodiment of the present application provides a helium inlet uniformizing device for a steam generator of a high-temperature gas-cooled reactor, which is used to pass helium into a top chamber of the steam generator of the high-temperature gas-cooled reactor, and includes a connecting tube and a gas outlet;

[0006] The air outlet portion is used to be arranged inside the top chamber, and the air outlet portion includes a cylinder and a cover. The side wall of the cylinder is provided with a plurality of first air outlet holes, and the plurality of first air outlet holes are arranged in a plurality of rows along the axial direction of the cylinder, and the plurality of first air outlet holes in each row are evenly arranged along the circumference of the cylinder;

[0007] The cover is connected to one end of the cylinder, and a plurality of second air outlet holes are formed on the cover;

[0008] One end of the connecting tube is connected to the helium inlet of the top chamber, and the other end is connected to an end of the cylinder away from the cover body.

[0009] In one embodiment, the distances between adjacent rows of the first air outlet holes gradually increase along the direction away from the connecting tube along the axis of the cylinder, the number of adjacent rows of the first air outlet holes is the same, and adjacent rows of the first air outlet holes are staggered along the circumference of the cylinder.

[0010] In one embodiment, any one of the first air outlet holes is a first reference hole, a line passing through the center of the first reference hole and parallel to the axis of the cylinder is a reference line, the first air outlet hole closest to the first reference hole in a row of the first air outlet holes adjacent to the first reference hole is a second reference hole, and an angle between a line connecting the centers of the first reference hole and the second reference hole and the reference line is fixed.

[0011] In one embodiment, the area of ​​the first air outlet gradually decreases along the direction in which the axis of the cylinder body moves away from the connecting cylinder.

[0012] In one embodiment, the outer surface of the cover is a spherical arc surface convex away from the cylinder;

[0013] The second air outlet holes are circular holes, the radii of the second air outlet holes are equal, and the outer normal of the second air outlet holes is perpendicular to the tangent plane of the cover body passing through the center of the second air outlet holes.

[0014] In one embodiment, the plurality of second air outlet holes are arranged in multiple rows along the axial direction of the cylinder, and the plurality of second air outlet holes in each row are evenly arranged along the circumference of the cylinder.

[0015] In one embodiment, the number of the second air outlet holes gradually decreases along the axial direction of the cylinder away from the connecting cylinder;

[0016] Any of the second air outlet holes is a third reference hole, and the second air outlet hole in a row of second air outlet holes adjacent to the third reference hole that is closest to the third reference hole is a fourth reference hole. The center of the end surface of the cover body close to the cylinder body is a reference point, and the angles between the centers of the third reference hole and the fourth reference hole and the lines connecting the reference points are fixed.

[0017] In one embodiment, a line connecting the center of the second air outlet closest to the end surface of the cover and the reference point is arranged at an angle to the end surface of the cover.

[0018] In one embodiment, both ends of the side surfaces of the first air outlet and the second air outlet are chamfered.

[0019] An embodiment of the present application further provides a helium inlet uniformity system for a steam generator of a high-temperature gas-cooled reactor, the helium inlet uniformity system for a steam generator of a high-temperature gas-cooled reactor comprising a helium inlet, a main steam pipe box, a helium draft tube, and the helium inlet uniformity device for the steam generator of the high-temperature gas-cooled reactor;

[0020] The connecting tube is connected to the helium inlet, the helium inlet uniformizing device of the steam generator of the high-temperature gas-cooled reactor is located in the top chamber of the main steam pipe box, the multiple first air outlet holes and the multiple second air outlet holes connect the inside of the helium inlet uniformizing device of the steam generator of the high-temperature gas-cooled reactor with the top chamber, and the helium guide tube is connected to the top chamber.

[0021] The helium inlet uniformity system of the steam generator of the high-temperature gas-cooled reactor described above has a cover connected to one end of the cylinder, and the cylinder and the cover are respectively provided with a plurality of first outlet holes and a plurality of second outlet holes. After entering the outlet, the helium flows along the axial direction of the cylinder away from the connecting cylinder, and sequentially passes through a plurality of rows arranged along the axial direction of the cylinder. The plurality of first outlet holes in each row are uniformly arranged along the circumference of the cylinder, so that after each helium passes through a row of first outlet holes, it is discharged from the outlet through the row of first outlet holes and enters the top chamber, and finally enters the top chamber through the second outlet holes. Thus, the helium is uniformly discharged from the outlet and enters the top chamber, so that the helium flow rate of the helium guide tube is uniformly distributed, and the primary circuit helium flow rate in the steam generator of the high-temperature gas-cooled reactor is uniformly distributed, thereby ensuring uniform temperature between the heat transfer tubes. At the same time, the grid structure of the plurality of first outlet holes and the plurality of second outlet holes provided in the outlet reduces the helium flow rate in the top chamber, thereby preventing the helium from directly hitting the main steam pipe box due to excessive flow of primary side helium out of the outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A cross-sectional view from one perspective of a helium inlet uniformization system of a steam generator of a high temperature gas-cooled reactor according to one embodiment;

[0023] Figure 2 A cross-sectional view of a cylinder according to an embodiment from one perspective;

[0024] Figure 3 is a cross-sectional view of a cover body of an embodiment from one perspective;

[0025] Figure 4 A schematic diagram of helium flow distribution of a helium inlet uniformizing device for a steam generator of a high-temperature gas-cooled reactor according to one embodiment.

[0026] Figure Number:

[0027] 100- Helium inlet uniformization device for steam generator of high temperature gas-cooled reactor;

[0028] 110-connecting tube;

[0029] 120-exhaust part;

[0030] 121-cylinder; 1211-first air outlet; 1212-first reference hole; 1213-second reference hole;

[0031] 122 - cover; 1221 - second air outlet; 1222 - third reference hole; 1223 - fourth reference hole;

[0032] 210-helium inlet;

[0033] 220-main steam pipe box;

[0034] 230-helium guide tube;

[0035] 240-top chamber;

[0036] X-helium flow direction; A-reference point; S-reference line. DETAILED DESCRIPTION

[0037] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0040] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0043] Please refer to Figure 1 and Figure 2 An embodiment of the present application provides a helium inlet uniformization device 100 for a steam generator of a high-temperature gas-cooled reactor, which is used to pass helium into a top chamber 240 of the steam generator of the high-temperature gas-cooled reactor, and includes a connecting tube 110 and a gas outlet 120.

[0044] The helium inlet uniformization device 100 for the steam generator of the high-temperature gas-cooled reactor described above has an outlet portion 120 for being disposed within the top chamber 240. The outlet portion 120 includes a barrel 121 and a cover 122. A plurality of first outlet holes 1211 are provided on the sidewall of the barrel 121. One end of the connecting barrel 110 is connected to the helium inlet 210 of the top chamber 240, and the other end is connected to the end of the barrel 121 away from the cover 122. Thus, helium can pass through the helium inlet 210 and, via the connecting barrel 110, into the outlet portion 120 located within the top chamber 240. The plurality of first outlet holes 1211 are arranged in a plurality of rows along the axial direction of the barrel 121, and the plurality of first outlet holes 1211 in each row are uniformly arranged along the circumference of the barrel 121. The cover 122 is connected to one end of the cylinder 121, and a plurality of second gas outlet holes 1221 are provided on the cover 122. After entering the gas outlet portion 120, the helium flows along the axial direction of the cylinder 121 away from the connecting cylinder 110, and passes through multiple rows arranged along the axial direction of the cylinder 121 in sequence. The multiple first gas outlet holes 1211 in each row are evenly arranged along the circumference of the cylinder 121, so that every time the helium passes through a row of first gas outlet holes 1211, it is discharged from the gas outlet portion 120 into the top chamber 240 through the first gas outlet holes 1211 in this row, thereby preventing the irregular arrangement of the first gas outlet holes 1211 from causing disorder in the discharge of helium, and the helium is evenly discharged from the gas outlet portion 120 into the top chamber 240, so that the helium flow of the helium guide tube 230 is evenly distributed, and the helium flow of the first circuit in the steam generator of the high-temperature gas-cooled reactor is evenly distributed, thereby ensuring the uniform temperature between the heat transfer tubes.

[0045] Specifically, the helium inlet uniformization device 100 of the steam generator of the high-temperature gas-cooled reactor has an axial length of 600-2000 mm along the cylinder 121, an axial length of 100-1400 mm, an inner diameter of the cylinder 121 is 770-1400 mm, a wall thickness of the gas outlet portion 120 is 10 mm, and multiple first gas outlet holes 1211 are arranged in 2-10 rows along the axial direction of the cylinder 121, the number of first gas outlet holes 1211 in each row is 20-60, and the number of second gas outlet holes 1221 is 91-269.

[0046] Please refer to Figure 2 and Figure 4In one embodiment, the distance between adjacent rows of first gas outlet holes 1211 gradually increases as the axis of the cylinder 121 moves away from the connecting tube 110. Adjacent rows of first gas outlet holes 1211 have the same number of holes, and are staggered along the circumference of the cylinder 121. Because the cylinder 121 has a uniform inner diameter along its axial direction, the helium content decreases with each row of first gas outlet holes 1211 it passes through as helium flows axially along the cylinder 121. Therefore, to ensure more uniform helium outflow within a fixed length along the axial direction of the cylinder 121, the distance between adjacent rows of first gas outlet holes 1211 gradually increases as the axis of the cylinder 121 moves away from the connecting tube 110. If the centers of adjacent first air outlet holes 1211 in each row are connected to form a straight line parallel to the axis of the cylinder 121, helium will continue to flow out of the side wall of the cylinder 121 parallel to the axis of the cylinder 121 where the first air outlet holes 1211 are provided, while helium will continue to not flow out of the side wall of the cylinder 121 adjacent to the side wall of the cylinder 121 where the first air outlet holes 1211 are provided along the helium flow direction X, which will cause uneven helium outflow. Therefore, in order to avoid the uneven helium outflow caused by the above situation, the adjacent rows of first air outlet holes 1211 are staggered along the circumference of the cylinder 121.

[0047] Please refer to Figure 2 Preferably, the multiple first air outlet holes 1211 are square holes. Since the helium flows along the axial direction of the cylinder 121, the first air outlet holes 1211 are set as square holes, so that the edges of the square holes along the axial direction of the cylinder 121 are parallel to the helium flow direction X, so that the helium can flow out of the air outlet part 120 more evenly through the first air outlet holes 1211. At the same time, designing the first air outlet holes 1211 as square holes can simplify the process of theoretical calculation, simulation and actual experiment.

[0048] In other embodiments, the first air outlet 1211 may also be a circular hole, a polygonal hole, or a hole of other shapes, which will not be described in detail.

[0049] Please refer to Figure 2 Specifically, the number of the first air outlet holes 1211 in each row uniformly arranged along the circumference of the cylinder 121 is 50.

[0050] Please refer to Figure 2In one embodiment, any first air outlet hole 1211 is a first reference hole 1212, and a line passing through the center of the first reference hole 1212 and parallel to the axis of the cylinder 121 is a reference line S. The first air outlet hole 1211 closest to the first reference hole 1212 in a row of first air outlet holes 1211 adjacent to the first reference hole 1212 is a second reference hole 1213. The angle between the line connecting the center of the first reference hole 1212 and the center of the second reference hole 1213 and the reference line S is fixed, so that after each row of first air outlet holes 1211 is passed, the center of the next row of first air outlet holes 1211 is fixed, so that the position where the helium flows out of the next row of first air outlet holes 1211 is fixed, thereby preventing the helium from flowing out in a disorderly manner. At the same time, the angle between the line connecting the center of the first reference hole 1212 and the center of the second reference hole 1213 and the reference line S is fixed, which can simplify the process of theoretical calculation, simulation and actual experiment.

[0051] Specifically, the angle between the line connecting the center of the first reference hole 1212 and the center of the second reference hole 1213 and the reference line S is 3°-9°.

[0052] Preferably, the angle between the line connecting the center of the first reference hole 1212 and the center of the second reference hole 1213 and the reference line S is 3.6°.

[0053] Please refer to Figure 2 and Figure 4 In one embodiment, the area of ​​the first air outlet holes 1211 gradually decreases along the direction away from the connecting tube 110 along the axis of the cylinder 121. Since the inner diameter of the cylinder 121 along its axial direction is the same, the helium content will decrease each time it passes through a row of first air outlet holes 1211 when the helium flows axially along the cylinder 121. Therefore, in order to ensure that the helium flow within a fixed length along the axial direction of the cylinder 121 is more uniform and the pressure of the helium flow through the first air outlet holes 1211 is stable, the area of ​​adjacent rows of first air outlet holes 1211 gradually decreases along the direction away from the connecting tube 110 along the axis of the cylinder 121.

[0054] Please refer to Figure 2 and Figure 4 Specifically, in order to ensure that the static pressure P of the helium flowing out of each first outlet hole 1211 is always greater than the pressure P in the top chamber 240 outside the outlet portion 120, out , ensuring that helium can stably flow out from the first outlet hole 1211 of the outlet portion 120, according to Figure 4 and one The dimensional static pressure distribution equations are shown in formulas (1) and (2).

[0055]

[0056]

[0057] Where P is the static pressure, ρ is the density, K is the static pressure recovery coefficient (related to structural design), and v is the flow velocity. The subscripts l, r, and out represent the left, right, and exterior sides of the first air outlet 1211, respectively. The lengths and widths of the five rows of first air outlets 1211 along the axial direction of the cylinder 121, facing away from the connecting cylinder 110, are: 70 mm × 50 mm / 70 mm × 40 mm / 60 mm × 40 mm / 50 mm × 40 mm / 40 mm × 40 mm, respectively.

[0058] Please refer to Figure 1 and Figure 3 In one embodiment, the outer surface of the cover 122 is a spherical arc surface that is convex away from the cylinder 121, so that the volume of the helium along the axial direction of the cylinder 121 can gradually decrease and flow out steadily, avoiding the situation where the cover 122 is set to a flat plate, which causes the helium to collide significantly with the portion of the flat cover 122 where no air outlet is provided.

[0059] The second air outlet 1221 is a circular hole with a constant radius. The outer normal of the second air outlet 1221 is perpendicular to the tangent plane of the cover body 122 passing through the center of the second air outlet 1221. Since the outer surface of the cover body 122 is a spherical arc surface convex away from the cylinder body 121, helium can stably flow out from the second air outlet 1221 vertically along the tangent plane of the cover body 122, thereby avoiding helium flow turbulence caused by second air outlets 1221 with different directions and / or different radii.

[0060] In other embodiments, the cover 122 may also be in a flat plate shape or other shapes, as long as the cover 122 is connected to the cylinder 121 , which will not be elaborated herein.

[0061] In other embodiments, the second air outlet hole 1221 may be a square hole, a polygonal hole, or a hole of other shapes, which will not be described in detail.

[0062] Please refer to Figure 1 and Figure 3 In one embodiment, the plurality of second gas outlet holes 1221 are arranged in a plurality of rows along the axial direction of the cylinder 121, and the plurality of second gas outlet holes 1221 in each row are evenly arranged along the circumference of the cylinder 121, so that when the helium flows in the cover body 122 along the axial direction of the cylinder 121 away from the connecting cylinder 110, the helium sequentially passes through the plurality of second gas outlet holes 1221 arranged in a plurality of rows along the axial direction of the cylinder 121 and evenly arranged along the circumference of the cylinder 121. Therefore, each time the helium passes through a row of first gas outlet holes 1211, the helium is discharged from the gas outlet portion 120 into the top chamber 240 through the row of first gas outlet holes 1211, so that the helium is evenly discharged from the gas outlet portion 120 into the top chamber 240, so that the helium flow rate of the primary circuit in the steam generator of the high-temperature gas-cooled reactor is evenly distributed.

[0063] Please refer to Figure 1 and Figure 3 In one embodiment, the number of the second gas outlet holes 1221 gradually decreases along the axial direction of the cylinder 121 away from the connecting cylinder 110, thereby ensuring that when the helium flows in the cover body 122 along the axial direction of the cylinder 121 away from the connecting cylinder 110, the static pressure P of the helium gas when flowing through the second gas outlet holes 1221 is always greater than the pressure P in the top chamber 240 outside the gas outlet portion 120, even if the space and content of the fixed length along the axial direction of the cylinder 121 gradually decrease. out , ensuring that helium can stably flow out from the second outlet hole 1221 of the outlet portion 120.

[0064] Any second air outlet hole 1221 is a third reference hole 1222, and the second air outlet hole 1221 in a row of second air outlet holes 1221 adjacent to the third reference hole 1222 that is closest to the third reference hole 1222 is a fourth reference hole 1223. The center of the end surface of the cover body 122 close to the cylinder body 121 is the reference point A, and the angle between the center line of the third reference hole 1222 and the fourth reference hole 1223 and the line connecting the reference points A is fixed. If the centers of adjacent second air outlet holes 1221 in each row are connected to form an arc intersecting the axis of the cylinder 121, the inner wall of the cover body 122 with the second air outlet holes 1221 will continue to flow out helium along the above-mentioned arc, while the inner wall of the cover body 122 adjacent to the second air outlet holes 1221 will continue to not flow out helium along the direction of helium flow, which will cause uneven helium outflow. Therefore, in order to avoid the uneven helium outflow caused by the above situation, the centers of the third reference hole 1222 and the fourth reference hole 1223 are respectively set to form an angle with the line connecting the reference point A. The angles between the lines connecting the centers of the third reference hole 1222 and the fourth reference hole 1223 and the lines connecting the reference points A are fixed, so that after each helium passes through a row of second air outlet holes 1221, the centers of the next row of second air outlet holes 1221 are fixed, so that the position where the helium flows out of the next row of second air outlet holes 1221 is fixed, preventing the helium from flowing out in a disorderly manner. At the same time, the angles between the lines connecting the centers of the third reference hole 1222 and the fourth reference hole 1223 and the lines connecting the reference points A are fixed, which can simplify the process of theoretical calculation, simulation and physical experiment.

[0065] Specifically, the second air outlet holes 1221 are arranged in three rows along the axis of the cylinder body 121 in a direction away from the connecting cylinder 110 , and the number of the second air outlet holes 1221 in each row is 50, 40, and 1 respectively.

[0066] Preferably, the second air outlet holes 1221 are arranged in 9 rows along the axis of the cylinder body 121 away from the connecting cylinder 110, and the number of second air outlet holes 1221 in each row is 50, 50, 50, 40, 30, 25, 15, 8, and 1 respectively.

[0067] In other embodiments, the second air outlet holes 1221 are arranged in 4-8 rows along the axis of the cylinder body 121 in a direction away from the connecting cylinder 110 , and the number of the second air outlet holes 1221 in each row decreases from 50 to 1.

[0068] Specifically, the angles between the lines connecting the centers of the third reference hole 1222 and the fourth reference hole 1223 and the lines connecting the reference points A are 10°-40°.

[0069] Preferably, the angles between the lines connecting the centers of the third reference hole 1222 and the fourth reference hole 1223 and the lines connecting the reference points A are 15°.

[0070] Please refer to Figure 1 and Figure 3 In one embodiment, the line connecting the center of the second air outlet 1221 closest to the end face of the cover body 122 and the reference point A is set at an angle to the end face of the cover body 122, so that the second air outlet 1221 and the end face of the cover body 122 close to the cylinder body 121 are at a certain distance, leaving space for the connection between the cylinder body 121 and the cover body 122.

[0071] In one embodiment, both ends of the side surfaces of the first gas outlet 1211 and the second gas outlet 1221 are chamfered, so that helium can flow out of the gas outlet portion 120 more smoothly through the first gas outlet 1211 and the second gas outlet 1221 .

[0072] In other embodiments, the various parameters of the helium inlet uniformization device 100 of the steam generator of the high-temperature gas-cooled reactor can be flexibly selected according to actual conditions to achieve uniform discharge of helium from the outlet portion 120 into the top chamber 240, so that the helium flow of the helium guide tube 230 is evenly distributed, and the helium flow of the first circuit in the steam generator of the high-temperature gas-cooled reactor is evenly distributed, thereby ensuring uniform temperature between the heat transfer tubes.

[0073] Please refer to Figure 1 An embodiment of the present application further provides a helium inlet uniformization system for a steam generator of a high-temperature gas-cooled reactor. The helium inlet uniformization system for a steam generator of a high-temperature gas-cooled reactor includes a helium inlet 210, a main steam pipe box 220, a helium flow guide tube 230, and a helium inlet uniformization device 100 for the steam generator of the high-temperature gas-cooled reactor.

[0074] The connecting tube 110 is connected to the helium inlet 210, and the helium inlet uniformization device 100 of the steam generator of the high-temperature gas-cooled reactor is located in the top chamber 240 of the main steam pipe box 220. Multiple first air outlet holes 1211 and multiple second air outlet holes 1221 connect the inside of the helium inlet uniformization device 100 of the steam generator of the high-temperature gas-cooled reactor with the top chamber 240, and the helium guide tube 230 is connected to the top chamber 240.

[0075] The helium inlet uniform system of the steam generator of the high temperature gas-cooled reactor mentioned above, the cover body 122 is connected to one end of the cylinder body 121, and the cylinder body 121 and the cover body 122 are respectively provided with a plurality of first gas outlet holes 1211 and a plurality of second gas outlet holes 1221. After entering the gas outlet portion 120, the helium flows in the direction away from the connecting cylinder 110 along the axial direction of the cylinder body 121, and sequentially passes through the plurality of first gas outlet holes 1211 arranged in multiple rows along the axial direction of the cylinder body 121, and each row of the plurality of first gas outlet holes 1211 is uniformly arranged along the circumference of the cylinder body 121, so that each time the helium passes through a row of first gas outlet holes 1211, it is discharged from the gas outlet portion 120 through the first gas outlet holes 1211 in that row. 20 enters the top chamber 240, so that the helium is evenly discharged from the outlet portion 120 and enters the top chamber 240, and finally enters the top chamber 240 through the second outlet hole 1221, so that the helium flow of the helium guide tube 230 is evenly distributed, and the helium flow of the first circuit in the steam generator of the high-temperature gas-cooled reactor is evenly distributed, thereby ensuring the uniform temperature between the heat transfer tubes. At the same time, the outlet portion 120 is provided with a grid structure of multiple first outlet holes 1211 and multiple second outlet holes 1221, which reduces the helium flow rate in the top chamber 240, and avoids the helium gas on the primary side from directly hitting the main steam pipe box 220 due to the excessive speed of the primary side helium flowing out of the outlet portion 120.

[0076] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A helium inlet uniformizing device for a steam generator of a high temperature gas-cooled reactor, used for passing helium into the top chamber of the steam generator of the high temperature gas-cooled reactor, characterized in that: The helium inlet uniformity device of the steam generator of the high temperature gas-cooled reactor comprises a connecting tube and a gas outlet; The air outlet portion is used to be arranged inside the top chamber, and the air outlet portion includes a cylinder and a cover. The side wall of the cylinder is provided with a plurality of first air outlet holes, and the plurality of first air outlet holes are arranged in a plurality of rows along the axial direction of the cylinder, and the plurality of first air outlet holes in each row are evenly arranged along the circumference of the cylinder; The cover is connected to one end of the cylinder, and a plurality of second air outlet holes are formed on the cover; One end of the connecting tube is connected to the helium inlet of the top chamber, and the other end is connected to the end of the cylinder away from the cover body; The distances between adjacent rows of the first air outlet holes gradually increase as the axis of the cylinder moves away from the connecting cylinder. As the axis of the cylinder moves away from the connecting cylinder, the area of ​​the first gas outlet gradually decreases, and the static pressure of helium flowing out of each first gas outlet is always greater than the pressure P in the top chamber outside the gas outlet. out , where the one-dimensional static pressure distribution equation is as follows: Where P is the static pressure, ρ is the density, K is the static pressure recovery coefficient (related to the structural design), v is the flow velocity, and the subscripts l, r, and out represent the left side, right side, and outside of the first air outlet, respectively.

2. The helium inlet uniformization device for a steam generator of a high temperature gas-cooled reactor according to claim 1, characterized in that: The number of the first air outlet holes in adjacent rows is the same, and the first air outlet holes in adjacent rows are staggered along the circumference of the cylinder.

3. The helium inlet uniformization device for a steam generator of a high temperature gas-cooled reactor according to claim 2, characterized in that: Any of the first air outlet holes is a first reference hole, a line passing through the center of the first reference hole and parallel to the axis of the cylinder is a reference line, the first air outlet hole closest to the first reference hole in a row of the first air outlet holes adjacent to the first reference hole is a second reference hole, and an angle between a line connecting the centers of the first reference hole and the second reference hole and the reference line is fixed.

4. The helium inlet uniformization device for a steam generator of a high temperature gas-cooled reactor according to claim 2, characterized in that: The outer surface of the cover body is a spherical arc surface convex away from the cylinder body; The second air outlet holes are circular holes, the radii of the second air outlet holes are equal, and the outer normal of the second air outlet holes is perpendicular to the tangent plane of the cover body passing through the center of the second air outlet holes.

5. The helium inlet uniformization device for a steam generator of a high temperature gas-cooled reactor according to claim 4, characterized in that: The plurality of second air outlet holes are arranged in a plurality of rows along the axial direction of the cylinder, and the plurality of second air outlet holes in each row are evenly arranged along the circumference of the cylinder.

6. The helium inlet uniformization device for a steam generator of a high temperature gas-cooled reactor according to claim 5, characterized in that: The number of the second air outlet holes gradually decreases along the axial direction of the cylinder away from the connecting cylinder; Any of the second air outlet holes is a third reference hole, and the second air outlet hole in a row of second air outlet holes adjacent to the third reference hole that is closest to the third reference hole is a fourth reference hole. The center of the end surface of the cover body close to the cylinder body is a reference point, and the angles between the centers of the third reference hole and the fourth reference hole and the lines connecting the reference points are fixed.

7. The helium inlet uniformization device for a steam generator of a high temperature gas-cooled reactor according to claim 6, characterized in that: A line connecting the center of the second air outlet closest to the end surface of the cover and the reference point is arranged at an angle to the end surface of the cover.

8. The helium inlet uniformization device for a steam generator of a high temperature gas-cooled reactor according to claim 1, characterized in that: Both ends of the side surfaces of the first air outlet and the second air outlet are provided with chamfers.

9. A helium inlet uniformization system for a steam generator of a high temperature gas-cooled reactor, characterized in that: The helium inlet uniformization system of the steam generator of the high temperature gas-cooled reactor comprises a helium inlet, a main steam pipe box, a helium draft tube, and the helium inlet uniformization device of the steam generator of the high temperature gas-cooled reactor according to any one of claims 1 to 8; The connecting tube is connected to the helium inlet, the helium inlet uniformization device of the steam generator of the high-temperature gas-cooled reactor is located in the top chamber of the steam generator, the multiple first gas outlet holes and the multiple second gas outlet holes connect the inside of the helium inlet uniformization device of the steam generator and the top chamber, and the helium guide tube is connected to the top chamber.

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