A steam generator vessel simulation device

Abstract

An embodiment of the present invention provides a steam generator vessel simulation device, which includes a device main body; the device main body includes: a pressure-bearing outer cylinder; an inner cylinder disposed inside the pressure-bearing outer cylinder; an inner cylinder hoisting assembly disposed inside the pressure-bearing outer cylinder for hoisting the inner cylinder; a water inlet pipe disposed at one end of the pressure-bearing outer cylinder for introducing saturated water; a water outlet pipe disposed at the other end of the pressure-bearing outer cylinder for discharging water; a water supply assembly for supplying water to the pressure-bearing outer cylinder, disposed on the pressure-bearing outer cylinder near the gap; a temperature measurement assembly for measuring the temperature distribution of the water flowing into the gap; the water inlet flows from the water inlet pipe along the gap between the inner wall of the pressure-bearing outer cylinder and the outer wall of the inner cylinder to the water outlet pipe for discharging water. The embodiment of the present invention realizes the true simulation of the steady-state and transient thermohydraulic characteristics inside the steam generator within the full power range, and meets the real-time online monitoring requirements of the thermal stratification test of the water supply assembly.

Description

Technical Field

[0001] The present invention relates to a steam generator vessel simulation device. Background Art

[0002] During the process of starting up a pressurized water reactor to a low-power operation condition, the thermal stratification of the fluid in the feedwater component pipe and the thermal striation oscillation of the hot and cold fluids will cause the overall thermal stress and local thermal stress in the feedwater component pipe wall. During long-term operation, it will lead to structural damages such as cracking, displacement, thermal fatigue, and bending of the feedwater component pipeline, and even affect the integrity and operation safety of the pressure-bearing boundary of the steam generator. Therefore, in the design verification test of the feedwater component, it is necessary to monitor the thermal stratification phenomenon of the fluid in the feedwater component.

[0003] There are two key technologies for carrying out the thermal stratification test of the steam generator water component: 1. Design of the test body for the thermal stratification test of the steam generator feedwater component. The pressurized water reactor uses a saturated steam generator, and a typical saturated steam generator consists of an evaporation section (lower cylinder) and a steam-water separation section (upper cylinder). The secondary-side fluid downcomer in the lower cylinder section is formed by the annular cavity between the tube bundle sleeve and the shell, and the upper cylinder section includes complex equipment such as primary and secondary steam-water separators. The container design suitable for the thermal stratification test of the feedwater component must streamline the secondary-side structure of the steam generator on the premise of ensuring that the thermal-hydraulic parameters of the inner and outer flow fields of the secondary-side feedwater component are consistent with the prototype. 2. Design of the temperature monitoring point installation scheme. The structure of the feedwater component is relatively complex, and there are many temperature measurement points required for the test. Combining with the test body design scheme of the thermal stratification test of the steam generator feedwater component, the design and optimization of the temperature measurement point installation scheme are also key technical problems to be faced in carrying out the thermal stratification test of the feedwater component.

[0004] In summary, the overall structure of the steam generator system is complex. It is necessary to streamline the structure of the steam generator on the basis of ensuring that the flow field and temperature field where the feedwater component is located are consistent with the prototype, and carry out the design of the temperature monitoring scheme. Summary of the Invention

[0005] An embodiment of the present invention provides a steam generator vessel simulation device to achieve a true simulation of the steady-state and transient thermal-hydraulic characteristics inside the steam generator within the full power range and meet the real-time online monitoring requirements of the thermal stratification test of the feedwater component.

[0006] The embodiment of the present invention is realized through the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a steam generator vessel simulation device, including a device main body; the device main body includes:

[0008] A pressure-bearing outer cylinder;

[0009] An inner cylinder, arranged inside the pressure-bearing outer cylinder;

[0010] The inner cylinder hoisting assembly is arranged inside the pressure-bearing outer cylinder and is used for hoisting the inner cylinder;

[0011] The water inlet pipe is arranged at one end of the pressure-bearing outer cylinder and is used for introducing hot water;

[0012] The water outlet pipe is arranged at the other end of the pressure-bearing outer cylinder and is used for discharging water;

[0013] The water supply assembly is used for supplying cold water to the pressure-bearing outer cylinder and is arranged on the pressure-bearing outer cylinder near the gap;

[0014] The temperature measuring assembly is used for measuring the temperature distribution of the water flowing into the gap;

[0015] The hot water flows from the water inlet pipe along the gap between the inner wall of the pressure-bearing outer cylinder and the outer wall of the inner cylinder to the water outlet pipe for discharging water.

[0016] Further, a water inlet distributor is arranged inside the pressure-bearing outer cylinder, and the water inlet distributor is communicated with the water inlet pipe; the water inlet distributor is a frame structure with an opening on one side; the opening side of the water inlet distributor is communicated with the water inlet pipe; a plurality of openings are arranged on each side and the bottom surface of the water inlet distributor.

[0017] Further, the plurality of openings include a plurality of opening units; each opening unit contains three openings distributed in an equilateral triangle.

[0018] Further, the temperature measuring assembly is distributed in multiple concentric circles, and temperature measuring elements are distributed on each concentric circle.

[0019] Further, 1, 3, 6, 6, 12, and 12 temperature measuring elements are evenly distributed from the inner concentric circle to the outer concentric circle respectively; the insertion depths of the temperature measuring elements on the inner concentric circle to the outer concentric circle gradually become deeper in sequence.

[0020] Further, a manhole is arranged on the pressure-bearing outer cylinder.

[0021] Further, the inner cylinder hoisting assembly includes inner cylinder suspension rods arranged on the inner wall of the pressure-bearing outer cylinder; inner cylinder hoisting rings for connecting with the inner cylinder suspension rods are arranged on the inner cylinder.

[0022] Further, the inner cylinder includes:

[0023] The inner cylinder movable section and the inner cylinder fixed section form the inner cylinder through the inner cylinder positioning device;

[0024] The inner cylinder fixed section, and an inner cylinder support ring plate is arranged at the bottom of the inner cylinder fixed section; the inner cylinder support ring plate is used for contacting with the inner wall of the pressure-bearing outer cylinder to form a support for the inner cylinder;

[0025] The inner cylinder hoisting ring is arranged on the inner cylinder movable section.

[0026] Further, the pressure-bearing outer cylinder is formed by connecting an upper straight cylinder section, an inclined cone section, and a lower straight cylinder section; the temperature measuring assembly is arranged on the upper straight cylinder section; the water supply assembly is arranged on the inclined cone section; and the water outlet pipe is arranged on the lower straight cylinder section.

[0027] Further, the water outlet pipe is connected to a water outlet pipeline; and a skirt support is arranged on the outer side of the pressure-bearing outer cylinder.

[0028] Compared with the prior art, the embodiment of the present invention has the following advantages and beneficial effects:

[0029] A steam generator vessel simulation device according to an embodiment of the present invention forms a gap between the inner wall of the pressure-bearing outer cylinder and the outer wall of the inner cylinder through the pressure-bearing outer cylinder and the inner cylinder. Thus, hot water entering through the water inlet pipe and cold water entering through the water supply assembly form a temperature distribution area of cold water and hot water in the gap between the inner wall of the pressure-bearing outer cylinder and the outer wall of the inner cylinder. By monitoring the temperature distribution in the area near the water supply assembly and on the outer and inner wall surfaces of the water supply assembly in the gap between the inner wall of the pressure-bearing outer cylinder and the outer wall of the inner cylinder through the temperature measuring assembly, a true simulation of the steady-state and transient thermal-hydraulic characteristics inside the steam generator within the full power range is achieved, meeting the real-time online monitoring requirements of the thermal stratification test of the water supply assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a schematic structural diagram of a steam generator vessel simulation device.

[0032] Figure 2 It is a schematic structural diagram of a water inlet distributor.

[0033] Figure 3 It is a schematic bottom structural diagram of a water inlet distributor.

[0034] Figure 4 For Figure 3 a partial enlarged structural diagram of A of

[0035] Figure 5 It is a top view structural diagram of a temperature measuring assembly.

[0036] Figure 6 It is a side view structural diagram of a temperature measuring assembly.

[0037] Reference numerals in the drawings and corresponding component names:

[0038] 1 - Water supply component; 2 - Temperature measuring component; 3 - Manhole; 4 - Inlet pipe; 5 - Upper straight cylinder section; 6 - Tapered section; 7 - Movable section of inner cylinder; 8 - Positioning device for inner cylinder; 9 - Lower straight cylinder section; 10 - Fixed section of inner cylinder; 11 - Support ring plate of inner cylinder; 12 - Skirt support; 13 - Outlet pipeline; 14 - Outlet pipe; 15 - Suspension rod of inner cylinder; 16 - Inlet water distributor; 17 - Lifting ring of inner cylinder. Detailed implementation mode

[0039] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments and drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and do not limit the present invention.

[0040] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those of ordinary skill in the art that the present invention does not have to employ these specific details. In other embodiments, well-known structures, circuits, materials or methods are not specifically described in order to avoid obscuring the present invention.

[0041] Throughout the specification, the reference to "one embodiment", "embodiment", "one example" or "example" means that the specific features, structures or characteristics described in connection with the embodiment or example are included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment", "embodiment", "one example" or "example" appearing throughout the specification do not necessarily refer to the same embodiment or example. In addition, specific features, structures or characteristics can be combined in any appropriate combination and / or sub - combination in one or more embodiments or examples. In addition, those of ordinary skill in the art should understand that the drawings provided here are for illustrative purposes only and the drawings are not necessarily drawn to scale. The term "and / or" used here includes any and all combinations of one or more of the related listed items.

[0042] In the description of the present invention, the orientation or positional relationship indicated by terms such as "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 cannot be understood as a limitation on the protection scope of the present invention. Embodiment

[0043] To achieve a true simulation of the steady-state and transient thermal-hydraulic characteristics inside the steam generator across the full power range and meet the real-time online monitoring requirements of the feedwater component thermal stratification test, in a first aspect, an embodiment of the present invention provides a steam generator vessel simulation device. Refer to Figures 1-6 as shown, which includes a device main body; the device main body includes:

[0044] A pressure-bearing outer cylinder;

[0045] An inner cylinder, disposed inside the pressure-bearing outer cylinder;

[0046] An inner cylinder hoisting assembly, disposed inside the pressure-bearing outer cylinder, for hoisting the inner cylinder;

[0047] An inlet pipe 4, disposed at one end of the pressure-bearing outer cylinder, for introducing hot water;

[0048] An outlet pipe 14, disposed at the other end of the pressure-bearing outer cylinder, for discharging water;

[0049] A feedwater component 1, for introducing cold water into the pressure-bearing outer cylinder, disposed on the pressure-bearing outer cylinder near the gap;

[0050] A temperature measuring component 2, for measuring the temperature distribution of the water flowing into the gap;

[0051] The inlet water flows from the inlet pipe along the gap between the inner wall of the pressure-bearing outer cylinder and the outer wall of the inner cylinder to the outlet pipe for discharging water.

[0052] Refer to Figure 1 as shown, the device main body includes a pressure-bearing outer cylinder and an inner cylinder; an inner cylinder hoisting assembly is provided at the inner top of the pressure-bearing outer cylinder for hoisting the inner cylinder; a manhole is provided at the upper right part of the pressure-bearing outer cylinder; the inlet pipe is provided at the upper end of the pressure-bearing outer cylinder. The inlet water enters the pressure-bearing outer cylinder from the inlet pipe; a gap is formed between the outer wall of the inner cylinder and the inner wall of the pressure-bearing outer cylinder; a feedwater component is provided on the pressure-bearing outer cylinder near the gap for introducing cold water; specifically, the inlet pipe introduces hot water and the feedwater component introduces cold water; thus, a temperature distribution region is formed in the gap, and the temperature distribution in the temperature distribution region is measured by the temperature measuring component, thereby achieving a true simulation of the steady-state and transient thermal-hydraulic characteristics inside the steam generator and meeting the real-time online monitoring requirements of the feedwater component thermal stratification test.

[0053] Thus, in the embodiment of the present invention, a gap is formed between the inner wall of the pressure-bearing outer cylinder and the outer wall of the inner cylinder by the pressure-bearing outer cylinder and the inner cylinder. Thus, the hot water entering through the water inlet pipe and the cold water entering through the water supply assembly form a temperature distribution area of cold water and hot water in the gap between the inner wall of the pressure-bearing outer cylinder and the outer wall of the inner cylinder. By monitoring the temperature distribution in the area near the water supply assembly and on the outer and inner wall surfaces of the water supply assembly in the gap between the inner wall of the pressure-bearing outer cylinder and the outer wall of the inner cylinder by the temperature measuring assembly, a true simulation of the steady-state and transient thermal-hydraulic characteristics inside the steam generator within the full power range is achieved, meeting the real-time online monitoring requirements of the thermal stratification test of the water supply assembly.

[0054] Further, an inlet water distributor is provided inside the pressure-bearing outer cylinder, and the inlet water distributor is communicated with the water inlet pipe; the inlet water distributor is a frame structure with an opening on one side; the opening side of the inlet water distributor 16 is communicated with the water inlet pipe; a plurality of openings are provided on each side and the bottom surface of the inlet water distributor.

[0055] The aperture of the flow distribution holes of the water supply distributor is 20 mm, and 5 rows of 180 flow distribution holes are provided on the side surface; 109 flow distribution holes are provided on the bottom plate, and the overall distribution is triangular.

[0056] Further, the plurality of openings include a plurality of opening units; each opening unit includes three openings distributed in an equilateral triangle.

[0057] Reference Figure 4 As shown, the three openings of each equilateral triangle form a 60° angle.

[0058] Further, the temperature measuring assembly is distributed in multiple concentric circles, and temperature measuring elements are distributed on each concentric circle.

[0059] Further, 1, 3, 6, 6, 12, and 12 temperature measuring elements are evenly distributed from the inner concentric circle to the outer concentric circle; the insertion depths of the temperature measuring elements on the inner concentric circle to the outer concentric circle gradually become deeper from shallow.

[0060] Reference Figure 5 and 6 As shown, a temperature measuring assembly integrates 40 temperature measuring elements and is distributed in 6 concentric circles as a whole. There are 1, 3, 6, 6, 12, and 12 temperature measuring elements on each layer from the inner to the outer. When encapsulating and disassembling the thermocouple of the temperature measuring element, a wrench needs to be used for tightening at the top. Therefore, the heights of the temperature measuring elements are designed to gradually decrease from the inner to the outer, which can arrange as many temperature measuring elements as possible in a small space and will not affect the disassembly and assembly of the thermocouple.

[0061] Further, a manhole 3 is provided on the pressure-bearing outer cylinder.

[0062] Further, the inner cylinder hoisting assembly includes inner cylinder hanging rods 15 provided on the inner wall of the pressure-bearing outer cylinder; inner cylinder hoisting rings 17 for connecting with the inner cylinder hanging rods are provided on the inner cylinder.

[0063] Further, the inner cylinder includes:

[0064] The inner cylinder movable section 7 and the inner cylinder fixed section form the inner cylinder through the inner cylinder positioning device 8;

[0065] The inner cylinder fixed section 10, and an inner cylinder support ring plate 11 is provided at the bottom of the inner cylinder fixed section; the inner cylinder support ring plate is used to contact the inner wall of the pressure-bearing outer cylinder to form a support for the inner cylinder;

[0066] The inner cylinder hoisting ring is provided on the inner cylinder movable section.

[0067] The double-layer container structure design and the retractable inner cylinder enable the simulation device of the embodiment of the present invention to not only realize the true simulation of the secondary side thermal-hydraulic characteristics of the steam generator, but also realize the arrangement and installation of the thermal stratification real-time monitoring device for the feedwater assembly. Thus, the simulation of the relatively complex test conditions of the thermal stratification of the feedwater assembly is realized in a relatively simple structural form.

[0068] Further, the pressure-bearing outer cylinder is connected by an upper straight cylinder section 5, an inclined cone section 6 and a lower straight cylinder section 9; the temperature measuring assembly is provided on the upper straight cylinder section; the feedwater assembly is provided on the inclined cone section; the water outlet pipe is provided on the lower straight cylinder section.

[0069] Further, the water outlet pipe is connected with a water outlet pipeline 13; a skirt support 12 is provided on the outer side of the pressure-bearing outer cylinder.

[0070] The design of the water inlet distributor in the embodiment of the present invention makes the flow field in the upper space of the test body of the thermal stratification of the steam generator feedwater assembly uniform, reduces the problem of too high flow velocity caused by direct water inlet of the water inlet pipe, and reduces the generation of vortices; 2. The segmented and liftable inner cylinder structure design can not only simulate the secondary side downcomer of the prototype steam generator, but also increase the construction and maintenance space by lowering the upper cylinder section to realize the installation and replacement of temperature measurement points; 3. The design of the inner cylinder hanging rods and hoisting rings can realize the free lifting of the inner cylinder movable section in cooperation with an electric hoist; 4. The staggered arrangement of the temperature measuring elements enables the temperature measuring assembly to introduce enough thermocouples using a smaller space.

[0071] The installation method of the simulation device according to the embodiment of the present invention includes the following steps: 1. First, complete the welding of the lower head, the lower straight edge section and the inclined cone section; 2. Perform the butt welding of the inclined cone section and the central section of the water supply component; 3. Perform the welding of the upper straight edge section and the inclined cone section and assemble the temperature measurement component; 4. Install the inner cylinder and lower the movable section of the inner cylinder to the lowest position; 5. Through the temperature measurement component, pull the thermocouple into the container interior. The staff advances the cylinder body and enters the construction platform of the movable section of the inner cylinder to weld the temperature measurement points of the water supply component; 6. The construction personnel, on the construction platform of the inner cylinder, use an electric hoist to cooperate with the lifting rod and the lifting ring of the inner cylinder to raise the movable section of the inner cylinder to the highest position. The construction personnel remove and carry the electric hoist and leave the container through the manhole; 7. Perform the welding of the upper head. When damage occurs at the temperature monitoring point of the water supply component, the construction personnel enter the container interior through the manhole of the upper head and replace the temperature measurement points according to the above steps 4, 5, and 6.

[0072] The specific embodiments described above have further elaborated on the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A steam generator vessel simulation device, characterized in that, Comprising a device main body; the device main body includes: A pressure-bearing outer cylinder; An inner cylinder, disposed inside the pressure-bearing outer cylinder; An inner cylinder hoisting assembly, disposed inside the pressure-bearing outer cylinder, for hoisting the inner cylinder; An inlet pipe, disposed at one end of the pressure-bearing outer cylinder, for introducing hot water; An outlet pipe, disposed at the other end of the pressure-bearing outer cylinder, for discharging water; A water supply assembly, for supplying cold water to the pressure-bearing outer cylinder, disposed on the pressure-bearing outer cylinder near the gap; A temperature measuring assembly, for measuring the temperature distribution of the water flowing into the gap; The hot water flows from the inlet pipe along the gap between the inner wall of the pressure-bearing outer cylinder and the outer wall of the inner cylinder to the outlet pipe for discharging water.

2. The steam generator vessel simulation device according to claim 1, characterized in that An inlet water distributor is disposed inside the pressure-bearing outer cylinder, and the inlet water distributor is communicated with the inlet pipe; the inlet water distributor is a frame structure with an opening on one side; the opening side of the inlet water distributor is communicated with the inlet pipe; a plurality of openings are provided on each side and the bottom surface of the inlet water distributor.

3. The steam generator vessel simulation device according to claim 2, characterized in that, The plurality of openings include a plurality of opening units; each opening unit contains three openings distributed in an equilateral triangle.

4. The steam generator vessel simulation device according to claim 1, characterized in that, The temperature measuring assembly is distributed in multiple concentric circles, and temperature measuring elements are distributed on each layer of concentric circles.

5. The steam generator vessel simulation device according to claim 4, characterized in that, 1, 3, 6, 6, 12, and 12 temperature measuring elements are evenly distributed from the inner concentric circle to the outer concentric circle respectively; the insertion depths of the temperature measuring elements on the inner concentric circle to the outer concentric circle gradually become deeper in sequence.

6. The steam generator vessel simulation device according to claim 1, characterized in that, A manhole is provided on the pressure-bearing outer cylinder.

7. The steam generator vessel simulation device according to claim 1, characterized in that, The inner cylinder hoisting assembly includes inner cylinder suspension rods disposed on the inner wall of the pressure-bearing outer cylinder; inner cylinder hoisting rings for connecting with the inner cylinder suspension rods are provided on the inner cylinder.

8. The steam generator vessel simulation device according to claim 7, characterized in that, The inner cylinder includes: An inner cylinder movable section, which forms the inner cylinder with the inner cylinder fixed section through an inner cylinder positioning device; An inner cylinder fixed section, and an inner cylinder support ring plate is provided at the bottom of the inner cylinder fixed section; the inner cylinder support ring plate is used to contact the inner wall of the pressure-bearing outer cylinder to form a support for the inner cylinder; The inner cylinder hoisting ring is disposed on the inner cylinder movable section.

9. The steam generator vessel simulation device according to claim 1, wherein, The pressure-bearing outer cylinder is connected by an upper straight cylinder section, an inclined cone section, and a lower straight cylinder section; the temperature measuring assembly is disposed on the upper straight cylinder section; the water supply assembly is disposed on the inclined cone section; the outlet pipe is disposed on the lower straight cylinder section.

10. The steam generator vessel simulation device according to claim 1, characterized in that, The outlet pipe is connected with an outlet pipeline; a skirt support is provided on the outside of the pressure-bearing outer cylinder.

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