Cleaning system and method for throttling assembly of steam generator of high-temperature gas cooled reactor

Abstract

The invention provides a high-temperature gas cooled reactor steam generator throttling assembly cleaning system and method.The high-temperature gas cooled reactor steam generator throttling assembly cleaning system comprises a cleaning water storage tank, a water conveying pipe, a water conveying pump and a spray gun, and the cleaning water storage tank is provided with a first containing cavity and a first water outlet communicated with the first containing cavity; the first accommodating cavity is used for accommodating demineralized water; the first end of the water conveying pipe communicates with the first water outlet. The water conveying pump is connected to the water conveying pipe in series to pressurize demineralized water in the water conveying pipe. The spray gun is provided with a water supply channel and water spraying holes, the water supply channel communicates with the second end of the water conveying pipe, and the water spraying holes are suitable for communicating with the water supply channel and can spray high-pressure demineralized water towards the inner cavity of the throttling assembly. The inner cavity of the throttling assembly can be washed through high-pressure demineralized water, so that water scale, sediment or other foreign matter in the inner cavity can be effectively cleaned, the cleaning effect on the throttling assembly is ensured, and cleaning operation is simple and convenient.

Description

Technical Field

[0001] This invention relates to the field of steam generator throttling component cleaning technology, and more particularly to a cleaning system and method for a high-temperature gas-cooled reactor steam generator throttling component. Background Art

[0002] The high-temperature gas-cooled reactor steam generator consists of 19 heat exchange components, connecting pipes, tube sheets, and other internal components. The heat exchange components include 665 spiral heat transfer tubes. To ensure the stability of the gas-liquid two-phase flow within the heat transfer tubes and to meet the flow distribution requirements between the tubes, a throttling device is installed at the inlet of each heat transfer tube (see...). Figure 1 The throttling assembly typically includes three throttling orifices, with the smallest orifice diameter being only about Φ2.5mm.

[0003] As the operating time of the steam generator increases, the throttling components are affected by factors such as water quality, temperature, and pressure, and scale or oxide deposits are often formed inside them, which affects the heat exchange efficiency and service life of the steam generator, resulting in inconsistencies between the feed water flow and the steam generator outlet temperature.

[0004] In order to ensure the normal operation of the steam generator, the throttling components need to be cleaned. However, the throttling components are numerous and have small diameters. Manually disassembling and cleaning them after shutdown is not only difficult to ensure the cleaning effect, but also time-consuming and labor-intensive. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, one embodiment of the present invention provides a cleaning system for the throttling component of a high-temperature gas-cooled reactor steam generator. This cleaning system can use high-pressure demineralized water to flush the inner cavity of the throttling component to effectively clean scale, deposits or other foreign objects inside, ensuring the cleaning effect of the throttling component. The cleaning operation is simple and convenient.

[0007] Another embodiment of the present invention provides a method for cleaning the throttling assembly of a high-temperature gas-cooled reactor steam generator.

[0008] A cleaning system for a throttling assembly of a high-temperature gas-cooled reactor steam generator according to an embodiment of the present invention includes a cleaning water storage tank, a water supply pipe, a water supply pump, and a spray gun. The cleaning water storage tank has a first accommodating cavity and a first outlet communicating with the first accommodating cavity. The first accommodating cavity is used to contain demineralized water. A first end of the water supply pipe is connected to the first outlet. The water supply pump is connected in series with the water supply pipe to pressurize the demineralized water in the water supply pipe. The spray gun has a water supply channel and a spray nozzle. The water supply channel is connected to a second end of the water supply pipe. The spray nozzle is adapted to communicate with the water supply channel and is capable of spraying high-pressure demineralized water into the inner cavity of the throttling assembly.

[0009] According to an embodiment of the present invention, a high-temperature gas-cooled reactor steam generator throttling component cleaning system comprises a cleaning water storage tank and a water supply pipe that supply demineralized water to the water supply channel of the spray gun. A water pump provides power to pressurize the demineralized water in the water supply pipe, allowing the high-pressure demineralized water in the water supply channel to enter the spray nozzles of the spray gun and spray towards the inner cavity of the throttling component when the spray gun is positioned at the throttling component. This effectively washes away scale, deposits, or other foreign matter condensed within the inner cavity of the throttling component. Therefore, this cleaning system is not limited by the number or diameter of the throttling components and can conveniently and quickly complete the cleaning operation without removing the throttling components. This ensures the consistency of feedwater flow and outlet temperature during the operation of the high-temperature gas-cooled reactor steam generator, guaranteeing the operational stability of the steam generator, improving heat exchange system efficiency, reducing equipment downtime, and lowering production costs. Compared to related technologies, the present invention can utilize high-pressure demineralized water to flush the inner cavity of the throttling component, effectively cleaning scale, deposits, or other foreign matter, ensuring a cleaning effect on the throttling component, and the cleaning operation is simple and convenient.

[0010] In some embodiments, the spray gun includes a spray needle having a spray cavity and a water spray hole, the water supply channel, the spray cavity and the water spray hole being sequentially connected, and at least a portion of the spray needle being adapted to be slidably connected to the inner cavity of the throttling assembly along the extending direction of the throttling assembly.

[0011] In some embodiments, the spray holes are located on the sidewall of the spray needle, and there are multiple spray holes arranged at intervals on the sidewall of the spray needle.

[0012] In some embodiments, the cleaning system further includes a first filter connected in series on the water supply pipe and located between the water pump and the spray gun, wherein the first filter is a filter screen.

[0013] In some embodiments, the pump pressure of the water pump is P, and P is 35-40 MPa;

[0014] The cleaning system also includes a first pressure gauge, which is installed on the water supply pipe to monitor the delivery pressure of the demineralized water in the water supply pipe. The first pressure gauge is located between the water pump and the spray gun.

[0015] In some embodiments, the cleaning system further includes a first valve and a second valve, both of which are connected in series on the water supply pipe. The first valve is located between the cleaning water storage tank and the water pump, and the second valve is located between the water pump and the spray gun.

[0016] In some embodiments, the cleaning system further includes a waste liquid recovery device and a waste liquid storage tank. The waste liquid recovery device is adapted to be disposed below the throttling component. The waste liquid recovery device has a second accommodating cavity with a top opening and a second outlet communicating with the second accommodating cavity. The top opening of the second accommodating cavity faces the bottom end of the throttling component. The second accommodating cavity is used to recover wastewater after cleaning the throttling component. The waste liquid storage tank is communicating with the second outlet to store wastewater.

[0017] In some embodiments, the second outlet is located above the waste liquid storage tank in the vertical direction, and the second outlet is located at the bottom of the waste liquid recovery device.

[0018] In some embodiments, the waste liquid storage tank is provided with a third outlet, the cleaning water storage tank is also provided with a first inlet connected to the first accommodating cavity, and the cleaning system further includes a return water pipe, a waste water pump and a second filter. The third outlet, the return water pipe and the first inlet are connected in sequence. The waste water pump and the second filter are both connected in series on the return water pipe.

[0019] In some embodiments, the second filter is located between the wastewater pump and the cleaning water storage tank, and the cleaning system further includes a third valve, a fourth valve and a fifth valve, all of which are connected in series on the return water pipe;

[0020] The third valve is located between the third outlet and the wastewater pump, the fourth valve is located between the wastewater pump and the second filter, and the fifth valve is located between the second filter and the first inlet.

[0021] A method for cleaning the throttling assembly of a high-temperature gas-cooled reactor steam generator according to an embodiment of the present invention includes the following steps:

[0022] Preparation: Inject demineralized water into the cleaning water storage tank. The demineralized water flows from the first outlet to the inlet of the water pump. After the pump pressure of the water pump reaches the set pressure, the water pump delivers high-pressure demineralized water to the spray gun through the water pipe.

[0023] Cleaning involves spraying high-pressure desalinated water into the inner cavity of the throttling assembly through the spray nozzles of the spray gun, thereby rinsing away scale, deposits, or other foreign matter from the inner cavity of the throttling assembly.

[0024] The technical advantages of the cleaning method for the throttling assembly of the high-temperature gas-cooled reactor steam generator according to the present invention are the same as those of the cleaning system for the throttling assembly of the high-temperature gas-cooled reactor steam generator described above, and will not be repeated here.

[0025] In some embodiments, the cleaning operation specifically includes:

[0026] The nozzle of the spray gun is inserted into the inner cavity of the throttling assembly, and the water jet on the nozzle sprays high-pressure water jet into the inner cavity of the throttling assembly to wash away scale, deposits or other foreign objects in the inner cavity of the throttling assembly.

[0027] At set intervals, the spray needle is withdrawn a set distance away from the inner cavity of the throttling component until it is completely withdrawn from the inner cavity of the throttling component, thus completing the flushing of the inner cavity of the throttling component.

[0028] In some embodiments, after the cleaning operation, the cleaning method further includes:

[0029] Inspection: Visually inspect the cavity of the throttling assembly after rinsing with an endoscope to determine whether there are any residues in the cavity of the throttling assembly after rinsing.

[0030] Repeat the cleaning and inspection operations until all the throttling components have been cleaned.

[0031] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the throttling component in related technologies.

[0033] Figure 2 This is a schematic diagram of the cleaning system for the throttling assembly of a high-temperature gas-cooled reactor steam generator according to an embodiment of the present invention.

[0034] Figure 3 This is a partial cross-sectional view of the spray gun in the cleaning system of the throttling assembly of the high-temperature gas-cooled reactor steam generator according to an embodiment of the present invention.

[0035] Figure 4 This is a schematic flowchart of a method for cleaning the throttling assembly of a high-temperature gas-cooled reactor steam generator according to an embodiment of the present invention.

[0036] Figure label:

[0037] 1. Cleaning water storage tank; 11. First receiving cavity; 12. First water outlet; 13. First water inlet;

[0038] 2. Water supply pipe;

[0039] 3. Water pump;

[0040] 4. Spray gun; 41. Water supply channel; 42. Spray nozzle; 43. Spray needle; 431. Spray chamber;

[0041] 5. Throttling components;

[0042] 6. First filter; 61. First pressure gauge; 62. First valve; 63. Second valve;

[0043] 7. Waste liquid recovery device; 71. Second receiving chamber; 72. Second outlet;

[0044] 8. Waste liquid storage tank; 81. Third water outlet;

[0045] 9. Return water pipe; 91. Wastewater pump; 92. Second filter; 93. Third valve; 94. Fourth valve; 95. Fifth valve; 96. Second pressure gauge; 97. Third pressure gauge. DETAILED DESCRIPTION

[0046] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0047] like Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a cleaning system for a high-temperature gas-cooled reactor steam generator throttling assembly, comprising a cleaning water storage tank 1, a water supply pipe 2, a water pump 3, and a spray gun 4. The cleaning water storage tank 1 has a first accommodating cavity 11 and a first outlet 12 communicating with the first accommodating cavity 11, the first accommodating cavity 11 being used to contain demineralized water. The first end of the water supply pipe 2 is connected to the first outlet 12, and the water pump 3 is connected in series with the water supply pipe 2 to pressurize the demineralized water in the water supply pipe 2. The spray gun 4 has a water supply channel 41 and a spray hole 42, the water supply channel 41 being connected to the second end of the water supply pipe 2, the spray hole 42 being adapted to communicate with the water supply channel 41, and the spray hole 42 being able to spray high-pressure demineralized water into the inner cavity of the throttling assembly 5.

[0048] According to an embodiment of the present invention, the high-temperature gas-cooled reactor steam generator throttling assembly cleaning system comprises a cleaning water storage tank 1 and a water supply pipe 2, which together supply demineralized water to the water supply channel 41 of the spray gun 4. The water pump 3 provides power to pressurize the demineralized water in the water supply pipe 2, allowing the high-pressure demineralized water in the water supply channel 41 to enter the spray nozzle 42 of the spray gun 4 and spray it into the inner cavity of the throttling assembly 5 when the spray gun 4 is positioned at the throttling assembly 5. This sprays away scale, deposits, or other foreign matter condensed in the inner cavity of the throttling assembly 5. Therefore, this cleaning system is not affected by the throttling assembly. 5. Due to limitations in quantity and pipe diameter, the throttling component 5 can be cleaned conveniently and quickly without disassembling it. This ensures the consistency of feedwater flow and outlet temperature during the operation of the high-temperature gas-cooled reactor steam generator, guaranteeing the operational stability of the steam generator. It can also improve the efficiency of the heat exchange system, reduce equipment downtime, and lower production costs. Therefore, compared with related technologies, this invention can use high-pressure demineralized water to flush the inner cavity of the throttling component 5, effectively cleaning scale, deposits, or other foreign objects inside, ensuring the cleaning effect of the throttling component 5. The cleaning operation is simple and convenient.

[0049] like Figure 2 and Figure 3 As shown, in some embodiments, the spray gun 4 includes a spray needle 43, which has a spray cavity 431 and a water spray hole 42. The water supply channel 41, the spray cavity 431 and the water spray hole 42 are connected in sequence. At least a portion of the spray needle 43 is adapted to be slidably connected to the inner cavity of the throttling assembly 5 along the extension direction of the throttling assembly 5.

[0050] Understandably, the use of the spray needle 43 structure allows it to be inserted into the inner cavity of the throttling component 5 for spraying and cleaning, thereby achieving good cleaning of the inner cavity of the throttling component 5 and improving cleaning quality and efficiency.

[0051] Specifically, the spray cavity 431 can be the inner cavity of the spray needle 43. The outer contour of the cross-section of each of the water supply channel 41, spray cavity 431, and spray hole 42 can be circular to simplify production and improve efficiency. The cross-section is orthogonal to the extension direction of the aforementioned corresponding structure. Of course, other cross-sectional shapes (such as polygons, arbitrary closed curves, etc.) that can achieve the water delivery performance of each of the water supply channel 41, spray cavity 431, and spray hole 42 and ensure the delivery pressure of the demineralized water are also acceptable and are not specifically limited here. The apertures of the water supply channel 41, spray cavity 431, and spray hole 42 can decrease sequentially to further increase the spray pressure of the demineralized water and ensure the cleaning effect on the inner cavity of the throttling component 5. The spray hole 42 can be opened at the end of the spray needle 43 away from the water supply channel 41, so that when the end of the spray needle 43 away from the water supply channel 41 is inserted into the inner cavity of the throttling component 5, the spray hole 42 is located in the inner cavity of the throttling component 5, and the high-pressure demineralized water jet is sprayed to wash away the scale, deposits or other foreign objects condensed in the inner cavity of the throttling component 5.

[0052] It should be noted that when the spray needle 43 is inserted into the inner cavity of the throttling assembly 5 for spraying, in order to further ensure the cleaning effect on the inner cavity of the throttling assembly 5, the spray needle 43 can be rotated relative to the inner cavity of the throttling assembly 5 during rinsing, so that the entire wall surface of the inner cavity of the throttling assembly 5 can be completely rinsed by the water spray hole 42.

[0053] like Figure 2 and Figure 3 As shown, in some embodiments, the water spray holes 42 are located on the sidewall of the spray needle 43, and there are multiple water spray holes 42 arranged at intervals on the sidewall of the spray needle 43.

[0054] Understandably, flushing the inner cavity of the throttling component 5 simultaneously with multiple water spray holes 42 can disperse the high-pressure water jet, reduce the impact damage of the high-pressure demineralized water to the inner cavity of the throttling component 5 during the flushing process, and improve the flushing efficiency.

[0055] Preferably, multiple water spray holes 42 are arranged at equal intervals on the side wall of the spray needle 43 so that the high-pressure water jet is evenly dispersed, further improving the uniformity of water spraying of the entire spray needle 43.

[0056] like Figure 2 As shown, in some embodiments, the cleaning system further includes a first filter 6, which is connected in series on the water supply pipe 2 and located between the water pump 3 and the spray gun 4. The first filter 6 is a filter screen, which filters the demineralized water to prevent foreign objects in the demineralized water from entering the spray gun 4 and the throttling component 5 and affecting the normal operation of the aforementioned components.

[0057] like Figure 2 As shown, in some embodiments, the pump pressure of the water pump 3 is P, and P is 35-40 MPa.

[0058] The cleaning system also includes a first pressure gauge 61, which is installed on the water supply pipe 2 to monitor the delivery pressure of the demineralized water in the water supply pipe 2. The first pressure gauge 61 is located between the water pump 3 and the spray gun 4.

[0059] Understandably, the first pressure gauge 61 can monitor the delivery pressure of the demineralized water in the water supply pipe 2, so that the delivery pressure of the demineralized water reaches the set pressure range, that is, 35-40MPa, thereby ensuring the water supply pressure to the spray gun 4 and ensuring the cleaning effect.

[0060] like Figure 2 As shown, in some embodiments, the cleaning system further includes a first valve 62 and a second valve 63, both of which are connected in series on the water supply pipe 2. The first valve 62 is located between the cleaning water storage tank 1 and the water pump 3, and the second valve 63 is located between the water pump 3 and the spray gun 4.

[0061] Understandably, when it is necessary to flush the inner cavity of the throttling component 5, the first valve 62 is opened so that the demineralized water in the cleaning water storage tank 1 flows out from the first outlet to the water pump 3. When the first pressure gauge 61 detects that the delivery pressure of the demineralized water has reached the set pressure range, the second valve 63 is opened so that the high-pressure demineralized water is supplied to the water supply channel 41 of the spray gun 4 by the water supply pipe 2.

[0062] Specifically, the first valve 62 is used to control the opening and closing of the first outlet 12. The second valve 63 is used to control the opening and closing of the outlet of the delivery pump. Combining the above structure, the first valve 62, the water pump 3, the first pressure gauge 61, the second valve 63, and the first filter 6 can be connected in series on the water delivery pipe 2.

[0063] like Figure 2 As shown, in some embodiments, the cleaning system further includes a wastewater recovery device 7 and a wastewater storage tank 8. The wastewater recovery device 7 is adapted to be located below the throttling component 5. The wastewater recovery device 7 has a second receiving cavity 71 with a top opening and a second outlet 72 communicating with the second receiving cavity 71. The top opening of the second receiving cavity 71 faces the bottom end of the throttling component 5; in other words, the top opening of the second receiving cavity 71 can correspond directly to the bottom end of the throttling component 5. The second receiving cavity 71 is used to recover wastewater after cleaning the throttling component 5; the wastewater storage tank 8 is connected to the second outlet 72 to store wastewater.

[0064] It is understandable that by placing the waste liquid recovery device 7 below the throttling component 5 and aligning the top opening of the second accommodating cavity 71 with the bottom end of the throttling component 5, the wastewater in the inner cavity of the throttling component 5 can be automatically drawn into the second accommodating cavity 71 under gravity during the flushing process. Furthermore, the wastewater can be transferred to the waste liquid storage tank 8 through the second outlet 72, thereby achieving the collection of wastewater.

[0065] Specifically, on the projection plane orthogonal to the vertical direction, the projected outer contours of the bottom ends of all throttling components 5 are located within the projected outer contours of the top opening of the second receiving cavity 71, so that the wastewater from all throttling components 5 can fall into the second receiving cavity 71, thereby ensuring the wastewater recovery effect of the wastewater recovery device 7. The wastewater recovery device 7 can be a foldable water receiving frame.

[0066] like Figure 2 As shown, in some embodiments, the second outlet 72 is located above the waste liquid storage tank 8 in the vertical direction, and the second outlet 72 is located at the bottom of the waste liquid recovery device 7, so that the rinsing wastewater collected in the second accommodating cavity 71 can flow into the waste liquid storage tank 8 by gravity, which further simplifies the overall structure of the cleaning system and reduces energy consumption.

[0067] like Figure 2As shown, in some embodiments, the waste liquid storage tank 8 is provided with a third outlet 81, and the cleaning water storage tank 1 is also provided with a first inlet 13 connected to the first accommodating cavity 11. The cleaning system also includes a return water pipe 9, a waste water pump 91, and a second filter 92. The third outlet 81, the return water pipe 9, and the first inlet 13 are connected in sequence. The waste water pump 91 and the second filter 92 are both connected in series on the return water pipe 9. The waste water pump 91 is used to provide power for conveying wastewater in the return water pipe 9.

[0068] Understandably, by adopting the above structural design, the rinsing wastewater in the waste liquid storage tank 8 can be pumped from the wastewater pump 91 to the cleaning water storage tank 1, and the wastewater is filtered by the second filter 92 during the pumping process, so as to realize the recycling and reuse of wastewater, thereby achieving the purpose of environmental protection and energy saving.

[0069] For example, the second filter 92 can also be a filter screen, and the pore size of the filter screen can be 40 mesh, so as to filter out scale, sediment or other foreign objects washed away in the wastewater.

[0070] like Figure 2 As shown, in some embodiments, the second filter 92 is located between the wastewater pump 91 and the cleaning water storage tank 1. The cleaning system also includes a third valve 93, a fourth valve 94 and a fifth valve 95, all of which are connected in series on the return water pipe 9.

[0071] The third valve 93 is located between the third outlet 81 and the wastewater pump 91, the fourth valve 94 is located between the wastewater pump 91 and the second filter 92, and the fifth valve 95 is located between the second filter 92 and the first inlet 13.

[0072] Understandably, the third valve 93 is used to control the opening and closing of the third outlet 81, the fourth valve 94 is used to control the opening and closing of the outlet of the wastewater pump 91, and the fifth valve 95 is used to control the opening and closing of the first inlet 13, so as to control the opening and closing of each valve on the return water pipe 9 according to the wastewater collection situation in the waste liquid storage tank 8, thereby enabling the cleaning system to switch between two working modes: wastewater collection in the waste liquid storage tank 8 and wastewater recycling.

[0073] Furthermore, the cleaning system may also include a second pressure gauge 96 and a third pressure gauge 97, both of which are installed on the return water pipe 9 to monitor the delivery pressure of wastewater in the return water pipe 9. The second pressure gauge 96 is located between the third valve 93 and the wastewater pump 91, and the third pressure gauge 97 is located between the wastewater pump 91 and the fourth valve 94.

[0074] Therefore, compared with related technologies, the present invention can perform cleaning of the throttling component 5 when the outlet temperature of the steam generator deviates from the normal temperature, or during major overhaul or special maintenance of the steam generator. By installing and connecting the relevant pipelines, valves, pumps, spray guns, filters, etc. in the cleaning system, a water pump 3 with a pump pressure of up to 35-40MPa supplies high-pressure demineralized water to the spray gun 4 to perform high-pressure water jet cleaning of the throttling component 5, thereby washing away the scale or deposits condensed on the inner wall of the throttling component 5. The rinsing wastewater can flow into the waste liquid recovery device 7 under gravity, and then be filtered through the waste liquid storage tank 8 and the waste water pump 91 to the cleaning water storage tank 1 for recycling, achieving the purpose of environmental protection and energy saving.

[0075] like Figure 4 As shown in the figure, a method for cleaning the throttling assembly of a high-temperature gas-cooled reactor steam generator according to an embodiment of the present invention includes the following steps:

[0076] Step S1, Preparation: Inject demineralized water into the cleaning water storage tank 1. The demineralized water flows from the first outlet 12 to the inlet of the water pump 3. After the pump pressure of the water pump 3 reaches the set pressure, the water pump 3 delivers high-pressure demineralized water to the spray gun 4 through the water pipe 2.

[0077] Step S2, cleaning: the spray gun 4 sprays high-pressure demineralized water into the inner cavity of the throttling component 5 through the spray nozzle 42 to rinse away scale, deposits or other foreign objects in the inner cavity of the throttling component 5.

[0078] The technical advantages of the cleaning method for the throttling assembly of the high-temperature gas-cooled reactor steam generator according to the present invention are the same as those of the cleaning system for the throttling assembly of the high-temperature gas-cooled reactor steam generator described above, and will not be repeated here.

[0079] In some embodiments, step S2 specifically includes:

[0080] Step S21: Insert the nozzle 43 of the spray gun 4 into the inner cavity of the throttling assembly 5, and spray high-pressure water jets from the spray nozzle 42 on the nozzle 43 into the inner cavity of the throttling assembly 5 to wash away scale, deposits or other foreign objects in the inner cavity of the throttling assembly 5.

[0081] In step S22, at set intervals, the spray needle 43 is withdrawn a set distance away from the inner cavity of the throttling component 5 until the spray needle 43 is completely withdrawn from the inner cavity of the throttling component 5, thus completing the flushing of the inner cavity of the throttling component 5.

[0082] like Figure 4 As shown, in some embodiments, after step S2, the cleaning method further includes:

[0083] Step S3, Inspection: Place the endoscope inside the flushed throttling assembly 5 for visual inspection to determine whether there are any residues inside the flushed throttling assembly 5.

[0084] Repeat the cleaning and inspection operations until the cleaning of all throttle components 5 is completed.

[0085] Now, in combination with the specific structure of the throttle component cleaning system of the high-temperature gas-cooled reactor steam generator, its working process will be described as follows:

[0086] 1) Inject appropriate demineralized water into the cleaning water storage tank 1 and open the first valve 62;

[0087] 2) Start the water transfer pump 3 to make its pressure reach about 35 MPa and open the second valve 63;

[0088] 3) Insert the spray needle 43 of the spray gun 4 into the inner cavity of the throttle component 5, and open the switch of the spray gun 4 to rinse while retreating;

[0089] 4) After rinsing several times repeatedly, use an endoscope for visual inspection. It is qualified if there is no scale and other residues;

[0090] 5) Repeat steps 3) and 4) above to rinse and inspect other throttle components 5 until the cleaning of all throttle components 5 is completed;

[0091] 6) Close the second valve 63, stop the water transfer pump 3, and then close the first valve 62;

[0092] 7) After the waste liquid storage tank 8 is full of waste water, open the third valve 93, start the waste water pump 91, and then open the fourth valve 94 and the fifth valve 95 so that the waste water is filtered and recycled to the cleaning water storage tank 1;

[0093] 8) Wait until the waste water in the waste liquid storage tank 8 is drained, close the fourth valve 94 and the fifth valve 95, stop the waste water pump 91, and close the third valve 93;

[0094] 9) Complete all the cleaning work, remove the pipelines, valves, pumps, spray gun 4, etc. and place them in appropriate positions.

[0095] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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 should not be construed as a limitation to the present invention.

[0096] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0097] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0098] 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.

[0099] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0100] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A cleaning system for a throttling assembly of a high-temperature gas-cooled reactor steam generator, characterized in that, include: A cleaning water storage tank, the cleaning water storage tank having a first receiving cavity and a first outlet communicating with the first receiving cavity, the first receiving cavity being used to contain demineralized water; A water supply pipe and a water pump, wherein the first end of the water supply pipe is connected to the first water outlet, and the water pump is connected in series with the water supply pipe to pressurize the demineralized water in the water supply pipe; The spray gun has a water supply channel and a spray nozzle. The water supply channel is connected to the second end of the water supply pipe. The spray nozzle is adapted to be connected to the water supply channel and can spray high-pressure demineralized water into the inner cavity of the throttling component.

2. The cleaning system for the throttling assembly of a high-temperature gas-cooled reactor steam generator according to claim 1, characterized in that, The spray gun includes a spray needle, which has a spray cavity and a water spray hole. The water supply channel, the spray cavity, and the water spray hole are connected in sequence. At least a portion of the spray needle is adapted to be slidably connected to the inner cavity of the throttling assembly along the extending direction of the throttling assembly. And / or, the spray holes are located on the sidewall of the spray needle, and there are multiple spray holes arranged at intervals on the sidewall of the spray needle.

3. The cleaning system for the throttling assembly of a high-temperature gas-cooled reactor steam generator according to claim 1, characterized in that, It also includes a first filter, which is connected in series on the water supply pipe and located between the water pump and the spray gun. The first filter is a filter screen.

4. The cleaning system for the throttling assembly of a high-temperature gas-cooled reactor steam generator according to claim 1, characterized in that, The pump pressure of the water pump is P, and P is 35-40 MPa; The cleaning system also includes a first pressure gauge, which is installed on the water supply pipe to monitor the delivery pressure of the demineralized water in the water supply pipe. The first pressure gauge is located between the water pump and the spray gun.

5. The cleaning system for the throttling assembly of a high-temperature gas-cooled reactor steam generator according to claim 1, characterized in that, It also includes a first valve and a second valve, both of which are connected in series on the water supply pipe. The first valve is located between the cleaning water storage tank and the water pump, and the second valve is located between the water pump and the spray gun.

6. The cleaning system for the throttling assembly of a high-temperature gas-cooled reactor steam generator according to claim 1, characterized in that, Also includes: A waste liquid recovery device is provided, which is adapted to be located below the throttling component. The waste liquid recovery device has a second accommodating cavity with a top opening and a second outlet communicating with the second accommodating cavity. The top opening of the second accommodating cavity faces the bottom end of the throttling component. The second accommodating cavity is used to recover wastewater after cleaning the throttling component. Waste liquid storage tank, which is connected to the second outlet to store wastewater.

7. The high-temperature gas-cooled reactor steam generator throttling assembly cleaning system according to claim 6, characterized in that, The second outlet is located above the waste liquid storage tank in the vertical direction, and the second outlet is located at the bottom of the waste liquid recovery device.

8. The cleaning system for the throttling assembly of a high-temperature gas-cooled reactor steam generator according to claim 6 or 7, characterized in that, The waste liquid storage tank is provided with a third outlet, and the cleaning water storage tank is also provided with a first inlet connected to the first accommodating cavity. The cleaning system further includes: The return water pipe, the third water outlet, and the first water inlet are connected in sequence. A wastewater pump and a second filter are connected in series on the return water pipe.

9. The cleaning system for the throttling assembly of a high-temperature gas-cooled reactor steam generator according to claim 8, characterized in that, The second filter is located between the wastewater pump and the cleaning water storage tank. The cleaning system also includes a third valve, a fourth valve, and a fifth valve, all of which are connected in series on the return water pipe. The third valve is located between the third outlet and the wastewater pump, the fourth valve is located between the wastewater pump and the second filter, and the fifth valve is located between the second filter and the first inlet.

10. A method for cleaning the throttling assembly of a high-temperature gas-cooled reactor steam generator, characterized in that, The cleaning method includes the following steps: Preparation: Inject demineralized water into the cleaning water storage tank. The demineralized water flows from the first outlet to the inlet of the water pump. After the pump pressure of the water pump reaches the set pressure, the water pump delivers high-pressure demineralized water to the spray gun through the water pipe. Cleaning involves spraying high-pressure desalinated water into the inner cavity of the throttling assembly through the spray nozzles of the spray gun, thereby rinsing away scale, deposits, or other foreign matter from the inner cavity of the throttling assembly.

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