Air cooler of steam generator of high-temperature gas cooled reactor

Abstract

The invention discloses an air cooler of a high-temperature gas cooled reactor steam generator, which is characterized in that an air inlet main pipe surrounds one end of the steam generator and is used for inputting compressed air; the multiple air injection pipes are consistent with the steam generator in the extending direction and are evenly distributed along the periphery of the steam generator, one ends of the multiple air injection pipes are connected with the air inlet main pipe, the other ends of the multiple air injection pipes are closed, and multiple air injection holes facing the steam generator are formed in the multiple air injection pipes in the length direction of the multiple air injection pipes. The plurality of gas ejector pipes can be telescopically deformed along with the telescopic deformation of the steam generator in the length direction, and each of the plurality of gas ejector pipes comprises a plurality of pipe sections which are connected in sequence and can be independently detached. The device is high in heat exchange coefficient, good in cooling effect, low in corrosivity, high in safety, convenient for in-service inspection of weld joints of the shell of the steam generator, and suitable for cooling steam generators with or without external thermal insulation structures.

Description

Technical Field

[0001] The invention belongs to nuclear power boilers and auxiliary equipment such as high temperature gas-cooled reactor nuclear power plant equipment, and in particular relates to an air cooler for a high temperature gas-cooled reactor steam generator. Background Art

[0002] After the emergency shutdown of a high-temperature gas-cooled reactor nuclear power plant is triggered, the steam generator needs to be cooled. In the early stage after the shutdown, the internal temperature of the steam generator is high, and there is supercooled water, saturated water and superheated steam. The working medium state and temperature distribution are relatively complex. In order to reduce the thermal stress during the cooling process, the steam generator shell needs to be cooled for a long time with air to allow the steam generator to cool down slowly.

[0003] At present, for high-temperature gas-cooled reactor steam generators without external insulation structures, the main technical measure for air cooling is to introduce air from the environment outside the steam generator compartment. One of its disadvantages is that the airflow organization is extensive, the heat transfer coefficient is low, and the surface temperature distribution of the steam generator shell is uneven. The second disadvantage is that the air comes from the environment, contains dust and water vapor, which is easy to pollute the cabin environment and corrode the steam generator shell. For high-temperature gas-cooled reactor steam generators with external insulation structures, it is currently impossible to directly cool them with air, and they can only be cooled naturally. One of its disadvantages is that the cooling speed is too slow, which affects the economy of reactor operation. The second disadvantage is that the temperature of the steam generator shell is not controlled, and it may exceed the design temperature locally, posing a major safety hazard. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide an air cooler for a high temperature gas-cooled reactor steam generator, which has a high heat transfer coefficient, good cooling effect, low corrosion, high safety, and is convenient for in-service inspection of the weld seams of the steam generator shell; and is suitable for cooling steam generators with and without external insulation structures.

[0005] A high temperature gas-cooled reactor steam generator air cooler according to an embodiment of the present invention comprises:

[0006] An air intake main pipe, which surrounds one end of the steam generator and is used to input compressed air;

[0007] The plurality of jet pipes are provided with a plurality of jet pipes, the plurality of jet pipes are in the same extension direction as the steam generator and are evenly distributed along the periphery of the steam generator, the plurality of jet pipes are adjacent to the steam generator but not in contact with the steam generator, one end of the plurality of jet pipes are connected to the air intake main pipe and the other end is closed, the plurality of jet pipes are provided with a plurality of jet holes facing the steam generator along their length direction, the plurality of jet pipes can follow the expansion and contraction deformation of the steam generator in the length direction and undergo expansion and contraction deformation, and the plurality of jet pipes include a plurality of pipe sections that are sequentially connected and can be individually disassembled.

[0008] According to the air cooler of the steam generator of the high temperature gas-cooled reactor of the embodiment of the present invention, after the high temperature gas-cooled reactor is shut down urgently, the compressed air flows into the multiple jet pipes through the air intake main pipe, and the compressed air is transported to the jet holes at different positions of the multiple jet pipes through the multiple jet pipes, and is sprayed from the jet holes at different positions to different positions on the surface of the steam generator at close range, so that the shell of the steam generator after the high temperature gas-cooled reactor is shut down quickly and evenly. Since the shell of the steam generator undergoes axial thermal expansion, i.e., axial telescopic deformation, due to temperature changes, the jet pipe is designed to undergo telescopic deformation following the telescopic deformation of the steam generator, so the jet pipe can absorb the axial thermal expansion of the steam generator and compensate for the installation error of the jet pipe. The pipe sections of the jet pipe can be disassembled separately, and the jet pipe can be disassembled and assembled in sections. When the shell weld of the steam generator is in-service inspected, only the pipe section corresponding to the weld to be inspected can be disassembled, which is convenient for in-service inspection of the weld.

[0009] The advantages of the air cooler for a high-temperature gas-cooled reactor steam generator according to the embodiment of the present invention are: first, it adopts jet cooling with a high heat transfer coefficient, and can quickly and evenly cool the steam generator; second, the compressed air is highly clean and less corrosive than the external air; third, the pressure inside the air intake main pipe and the injection pipe is low, and the safety is high; fourth, the injection pipe can be disassembled and assembled in sections, which is convenient for the in-service inspection of the weld of the steam generator shell; fifth, the compressed air flow rate is adjustable, and the compressed air flow rate can be adjusted according to the cooling demand of the steam generator to achieve a good cooling effect; sixth, the air cooler for a high-temperature gas-cooled reactor steam generator according to the embodiment of the present invention is suitable for cooling the steam generator with and without an external insulation structure.

[0010] In some embodiments, the density of arrangement of the plurality of gas injection holes on each gas injection pipe in the axial direction of the gas injection pipe corresponds to the temperature of different parts of the steam generator.

[0011] In some embodiments, the axis of the injection pipe is parallel to the axis of the steam generator, and the plurality of injection holes on each of the injection pipes are symmetrical with respect to a plane defined by the axis of the injection pipe and the axis of the steam generator.

[0012] In some embodiments, two adjacent pipe sections are detachably connected via a first expansion joint.

[0013] In some embodiments, one end of each of the plurality of injection pipes is detachably connected to the air intake main pipe via a second expansion joint.

[0014] In some embodiments, each of the pipe segments is detachably fixed to the steam generator via a fixing device.

[0015] In some embodiments, the fixing device includes an embedded part, a first fixing part and a second fixing part, the embedded part is fixed on the steam generator, the first fixing part is fixed to the embedded part, the second fixing part is fixed to the steam generator, and the first fixing part and the second fixing part can detachably fix the pipe section together.

[0016] In some embodiments, the first fixing member is a first fixing plate, and the second fixing member is a second fixing plate. A first notch groove is provided on one side of the first fixing plate, and a second notch groove is provided on the second fixing plate. The first notch groove and the second notch groove clamp the pipe segment from opposite sides of the pipe segment, and the first fixing plate and the second fixing plate overlap each other up and down and are detachably fixed.

[0017] In some embodiments, the other ends of the plurality of gas injection pipes are sealed by blind plates.

[0018] In some embodiments, the steam generator has an external insulation structure or a cabin wall; the high temperature gas-cooled reactor steam generator air cooler also includes an exhaust pipe, and the exhaust pipe penetrates the external insulation structure or the cabin wall.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 It is a structural schematic diagram of the air cooler of the high temperature gas-cooled reactor steam generator of the present invention;

[0022] Figure 2 It is a schematic diagram of the air jet hole of a single air jet pipe of the present invention;

[0023] Figure 3 for Figure 1 The enlarged schematic diagram at A in the middle;

[0024] Figure 4 is a schematic diagram of a first fixing member of the fixing device of the present invention;

[0025] Figure 5 It is a schematic diagram of the second fixing member of the fixing device of the present invention.

[0026] Reference numerals:

[0027] Steam generator 1; external insulation structure 101; air intake main pipe 2; jet pipe 3; pipe section 301; first expansion joint 302; second expansion joint 303; jet hole 304; fixture 4; embedded part 401; first fixture 402; second fixture 403; first notch groove 4021; second notch groove 4031; exhaust pipe 5. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] Combine the following Figures 1 to 5 The air cooler of the steam generator of a high temperature gas-cooled reactor according to an embodiment of the present invention is described.

[0030] like Figure 1 and Figure 2 As shown, the air cooler of the steam generator of a high temperature gas-cooled reactor according to an embodiment of the present invention includes an air intake main pipe 2 and an injection pipe 3.

[0031] The intake main pipe 2 surrounds one end of the steam generator 1, for example, the intake main pipe 2 surrounds the lower end or the upper end of the steam generator 1. Figure 1 It is shown that the air intake main pipe 2 surrounds the lower end of the steam generator 1; the air intake main pipe 2 is used to input compressed air. Compared with the external air, the compressed air has good cleanliness and low corrosiveness. The flow rate of the compressed air in the air intake main pipe 2 is adjustable, and the pressure is close to normal pressure, that is, the pressure in the pipeline (the air intake main pipe 2 and the injection pipe 3) is low and the safety is high.

[0032] There are multiple jet pipes 3, for example, there may be 30 to 40 jet pipes 3. The multiple jet pipes 3 extend in the same direction as the steam generator 1, for example, the jet pipes 3 and the steam generator 1 are both vertical. The multiple jet pipes 3 are evenly distributed along the periphery of the steam generator 1, and the multiple jet pipes 3 are adjacent to the steam generator 1 but not in contact (e.g. Figure 2 As shown in FIG. 1 ), one end of each of the plurality of injection pipes 3 is connected to the intake main pipe 2 and the other end is closed, and each of the plurality of injection pipes 3 is provided with a plurality of injection holes 304 (as shown in FIG. 1 ) facing the steam generator 1 along its length direction. Figure 2 As shown in the figure, in this way, the compressed air is distributed to the multiple jet pipes 3 through the air intake main pipe 2, and the compressed air is transported to the jet holes 304 at different positions of the multiple jet pipes 3 through the multiple jet pipes 3, and is sprayed from the jet holes 304 at different positions to different positions on the surface of the steam generator 1 at close range, which can quickly and evenly cool the shell of the steam generator 1 after the emergency shutdown of the high-temperature gas-cooled reactor. The multiple jet pipes 3 can follow the expansion and contraction deformation of the steam generator 1 in the length direction and undergo expansion and contraction deformation, so that the axial thermal expansion of the steam generator 1 caused by temperature changes can be absorbed and the installation error of the jet pipe 3 can be compensated. The multiple jet pipes 3 each include a plurality of pipe sections 301 that are connected in sequence and can be removed separately, that is, the pipe section 301 can be easily removed separately from the entire jet pipe 3, so that when the shell weld of the steam generator 1 is inspected in service, only the pipe section 301 corresponding to the weld to be inspected can be removed, which is convenient for the in-service inspection of the weld.

[0033] According to the air cooler of the steam generator of the high temperature gas-cooled reactor of the embodiment of the present invention, after the high temperature gas-cooled reactor is shut down urgently, the compressed air flows into the multiple jet pipes 3 through the air intake main pipe 2, and the compressed air is transported to the jet holes 304 at different positions of the multiple jet pipes 3 through the multiple jet pipes 3, and is sprayed from the jet holes 304 at different positions to different positions on the surface of the steam generator 1 at close range, so that the shell of the steam generator 1 after the high temperature gas-cooled reactor is shut down quickly and evenly. Since the shell of the steam generator 1 undergoes axial thermal expansion, i.e., axial telescopic deformation, due to temperature changes, the jet pipe 3 is designed to undergo telescopic deformation following the telescopic deformation of the steam generator 1, so the jet pipe 3 can absorb the axial thermal expansion of the steam generator 1 and compensate for the installation error of the jet pipe 3. The pipe section 301 of the jet pipe 3 can be disassembled separately, and the jet pipe 3 can be disassembled and assembled in sections. When the shell weld of the steam generator 1 is inspected in service, only the pipe section 301 corresponding to the weld to be inspected can be disassembled, which is convenient for the in-service inspection of the weld.

[0034] The advantages of the air cooler for a high-temperature gas-cooled reactor steam generator according to the embodiment of the present invention are: first, it adopts jet cooling with a high heat transfer coefficient, and can quickly and evenly cool the steam generator 1; second, the compressed air is highly clean and less corrosive than the external air; third, the pressure inside the air intake main pipe 2 and the jet pipe 3 is low, and the safety is high; fourth, the jet pipe 3 can be disassembled and assembled in sections, which is convenient for the in-service inspection of the shell welds of the steam generator 1; fifth, the compressed air flow rate is adjustable, and the compressed air flow rate can be adjusted according to the cooling demand of the steam generator 1 to achieve a good cooling effect; sixth, the air cooler for a high-temperature gas-cooled reactor steam generator according to the embodiment of the present invention is suitable for cooling steam generators 1 with and without an external insulation structure 101.

[0035] In some embodiments, the density of the arrangement of the plurality of jet holes 304 on each jet pipe 3 in the axial direction of the jet pipe 3 corresponds to the temperature of different parts of the steam generator 1. At a relatively high temperature position of the steam generator 1, the arrangement density of the jet holes 304 is dense, while at a relatively low temperature position of the steam generator 1, the arrangement density of the jet holes 304 is sparse. This is because the surface temperature of the steam generator 1 is unevenly distributed after the emergency shutdown of the high-temperature cold gas reactor, with some parts having relatively high temperatures and some parts having relatively low temperatures. For example, Figure 1 As shown, after the emergency shutdown of the high-temperature cold gas reactor, the temperature of the metal structure at the upper part of the steam generator 1 is higher than that of the lower part. Therefore, the arrangement density of the jet holes 304 at the metal structure at the upper part of the steam generator 1 is denser, and the arrangement density of the jet holes 304 at the lower part of the steam generator 1 is relatively sparse, so that the cooling speed at different positions of the steam generator 1 can be controlled to achieve a better cooling effect.

[0036] In some embodiments, Figure 2 As shown, the axis of the jet pipe 3 is parallel to the axis of the steam generator 1, and the multiple jet holes 304 on each jet pipe 3 are symmetrical with respect to the plane determined by the axis of the jet pipe 3 and the axis of the steam generator 1. For example, the multiple jet holes 304 on each jet pipe 3 are arranged in an even number of rows, so that the steam generator 1 can achieve a better cooling effect.

[0037] In some embodiments, Figure 1 and Figure 3 As shown, two adjacent pipe sections 301 are detachably connected via first expansion joints 302. Specifically, the connection between the first expansion joint 302 and the pipe section 301 can be threaded or flanged, which is convenient for assembly and disassembly. The first expansion joint 302 can be a bellows, which can make the jet pipe 3 follow the expansion and contraction of the steam generator 1 and deform, absorb the axial thermal expansion of the steam generator 1, and compensate for the installation error of the jet pipe 3.

[0038] In some embodiments, Figure 1As shown, one end of the plurality of injection pipes 3 is detachably connected to the intake main pipe 2 through the second expansion joint 303. Specifically, the second expansion joint 303 can be a bellows, and the second expansion joint 303 and the pipe section 301 and the intake main pipe 2 can be threaded or flanged, which is convenient for assembly and disassembly. The second expansion joint 303 can be a bellows, which can absorb the axial thermal expansion of the steam generator 1, compensate for the installation error of the injection pipe 3, and facilitate the installation between the second expansion joint 303 and the intake main pipe 2.

[0039] In some embodiments, Figure 3 As shown, each pipe section 301 is detachably fixed to the steam generator 1 by a fixing device 4, so that the pipe section 301 can be easily removed separately, thereby facilitating the in-service inspection of the weld of the steam generator 1.

[0040] In some embodiments, Figures 3 to 5 As shown, the fixing device 4 includes an embedded part 401, a first fixing part 402 and a second fixing part 403. The embedded part 401 is fixed to the steam generator 1, the first fixing part 402 is fixed to the embedded part 401, the second fixing part 403 is fixed to the steam generator 1, and the first fixing part 402 and the second fixing part 403 are detachably fixed to the pipe section 301. The fixing device 4 has a simple structure, which is convenient for the separate disassembly of the pipe section 301, and further facilitates the in-service inspection of the weld of the steam generator 1.

[0041] In some embodiments, the first fixing member 402 is a first fixing plate, and the second fixing member 403 is a second fixing plate. A first notch groove 4021 is provided on one side of the first fixing plate, and a second notch groove 4031 is provided on the second fixing plate. The first notch groove 4021 and the second notch groove 4031 clamp the pipe segment 301 from opposite sides of the pipe segment 301, and the first fixing plate and the second fixing plate overlap and are detachably fixed, for example, by bolts. The fixing device 4 has a simple structure, which facilitates the separate disassembly of the pipe segment 301, and further facilitates the in-service inspection of the weld of the steam generator 1.

[0042] In some embodiments, the other ends of the plurality of air injection pipes 3 are sealed by blind plates to prevent compressed air from being ejected from the other ends of the plurality of air injection pipes 3 .

[0043] In some embodiments, Figure 1 As shown, the steam generator 1 has an outer insulation structure 101 or a cabin wall; the high temperature gas-cooled reactor steam generator air cooler also includes an exhaust pipe 5, which penetrates the outer insulation structure 101 or the cabin wall to discharge the heated air. Specifically, the exhaust pipe 5 is arranged at an end away from the air intake main pipe 2, so that the heated air can be better discharged.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0045] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A high temperature gas-cooled reactor steam generator air cooler, It is characterized in that include: An air intake main pipe, which surrounds one end of the steam generator and is used to input compressed air; The plurality of jet pipes are provided with a plurality of jet pipes, the plurality of jet pipes are in the same extension direction as the steam generator and are evenly distributed along the periphery of the steam generator, the plurality of jet pipes are adjacent to the steam generator but not in contact with the steam generator, one end of the plurality of jet pipes are connected to the air intake main pipe and the other end is closed, the plurality of jet pipes are provided with a plurality of jet holes facing the steam generator along their length direction, the plurality of jet pipes can follow the expansion and contraction deformation of the steam generator in the length direction and undergo expansion and contraction deformation, and the plurality of jet pipes include a plurality of pipe sections that are sequentially connected and can be individually disassembled.

2. The high temperature gas-cooled reactor steam generator air cooler according to claim 1, It is characterized in that The density of arrangement of the plurality of injection holes on each injection pipe in the axial direction of the injection pipe corresponds to the temperature of different parts of the steam generator.

3. The high temperature gas-cooled reactor steam generator air cooler according to claim 1, It is characterized in that The axis of the injection pipe is parallel to the axis of the steam generator, and the plurality of injection holes on each of the injection pipes are symmetrical relative to a plane defined by the axis of the injection pipe and the axis of the steam generator.

4. The high temperature gas-cooled reactor steam generator air cooler according to claim 1, It is characterized in that Two adjacent pipe sections are detachably connected via a first expansion joint.

5. The high temperature gas-cooled reactor steam generator air cooler according to claim 1, It is characterized in that One end of each of the plurality of injection pipes is detachably connected to the intake main pipe via a second expansion joint.

6. The high temperature gas-cooled reactor steam generator air cooler according to claim 1, It is characterized in that Each of the pipe sections is detachably fixed to the steam generator via a fixing device.

7. The high temperature gas-cooled reactor steam generator air cooler according to claim 6, It is characterized in that The fixing device comprises an embedded part, a first fixing part and a second fixing part. The embedded part is fixed on the steam generator, the first fixing part is fixed to the embedded part, the second fixing part is fixed to the steam generator, and the first fixing part and the second fixing part can detachably fix the pipe section together.

8. The high temperature gas-cooled reactor steam generator air cooler according to claim 7, It is characterized in that The first fixing member is a first fixing plate, and the second fixing member is a second fixing plate. A first notch groove is provided on one side of the first fixing plate, and a second notch groove is provided on the second fixing plate. The first notch groove and the second notch groove clamp the pipe section from opposite sides of the pipe section, and the first fixing plate and the second fixing plate overlap each other up and down and are detachably fixed.

9. The high temperature gas-cooled reactor steam generator air cooler according to any one of claims 1 to 8, It is characterized in that The other ends of the plurality of air injection pipes are sealed by blind plates.

10. The high temperature gas-cooled reactor steam generator air cooler according to any one of claims 1 to 8, It is characterized in that The steam generator has an external insulation structure or a cabin wall; the high temperature gas-cooled reactor steam generator air cooler also includes an exhaust pipe, and the exhaust pipe penetrates the external insulation structure or the cabin wall.

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