An automatic decontamination apparatus and method for a steam generator

Abstract

The application discloses a steam generator automatic decontamination device and method, which comprises a pressurizing mechanism for ensuring the sealing performance of the steam generator, a liquid discharging mechanism for discharging the waste liquid after decontamination and cleaning from the steam generator, and a spraying mechanism for spraying the decontaminant to the inner surface of the steam generator. The spraying mechanism comprises a multi-path medicine supply mechanism, a decontamination mechanical arm and a decontamination hose fixed to the decontamination mechanical arm. The outlet of the decontamination hose is connected to a spray head. The decontamination mechanical arm is composed of a mechanical arm fixed section, a rotary link, a mechanical arm movable section, a rotary connecting rod, the spray head and the decontamination hose. The mechanical arm movable section can rotate by 360 degrees. The mechanical arm and the spray head with the space rotation by 360 degrees are combined to spray the foamed decontaminant to the surfaces, such as the lower water chamber of the steam generator, which need to be decontaminated. Then, the foamed decontaminant is washed clean by clean water. The waste liquid is discharged to a waste liquid tank for treatment. The method is simple, the decontamination effect is good, and the decontamination efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of temperature collection control, and particularly relates to a steam generator automatic decontamination device and method. BACKGROUND

[0002] A steam generator, also known as a steam heat source machine or colloquially as a boiler, is a device that produces steam. It uses fuel or other energy sources to heat water into hot water or steam to meet the steam demand of food, textile, industry and other industries. The core principle is to convert water into high-temperature and high-pressure steam by heating water. Its overall structure includes a boiler body and auxiliary equipment. Generally speaking, a steam generator contains a water tank, a heater and a steam outlet. When the water in the water tank is heated by the heater to the boiling point, the water begins to evaporate to form steam. As the heating process continues, steam is continuously generated and delivered to the place where it is needed through the outlet.

[0003] The lower water chamber of the steam generator belongs to the primary loop of the nuclear reactor during normal operation, and the working medium is the primary loop coolant. Since the corrosion products in the primary loop coolant will be activated as they flow through the reactor core, they will have Co-58, Co-60, Mn-54 and Fe-59 radioactive nuclides with long half-lives. The coolant transports the corrosion products to the surface of the primary side of the steam generator, forming a radiation source. Part of the radioactive substances may gradually adsorb on the lower water chamber of the steam generator due to corrosion deposition, ion exchange and other effects, accumulating to form a radioactive source or a radiation hot spot.

[0004] The above-mentioned radiation source has an adverse effect on the maintenance of the steam generator equipment. The radiation hot spot can cause the local radiation dose to be too high, which on the one hand increases the radiation dose of the maintenance personnel, and on the other hand makes it difficult to control the radiation of the nuclear power plant. According to statistics, the dose value contributed by the steam generator maintenance work accounts for more than 40% of the total occupational radiation dose in the nuclear power plant. In order to reduce the radiation exposure of the steam generator maintenance personnel, it is necessary to reduce the content of corrosion products and their radioactive nuclides.

[0005] Currently, mechanical decontamination, chemical decontamination and electrochemical decontamination are generally used for decontamination of the lower water chamber of the steam generator.

[0006] Mechanical decontamination has a low decontamination factor, a long decontamination time and poor decontamination effect. Chemical decontamination has a high decontamination factor, but requires a large amount of chemical drugs and generates the most waste liquid. Electrochemical decontamination has good effect and less radioactive waste, but the equipment cost is high, the technology is not mature, and the reliability needs to be verified. SUMMARY

[0007] The present application aims to provide a steam generator automatic decontamination device and method to overcome the technical problems of poor decontamination effect, excessive waste liquid and high cost of the existing steam generator lower water chamber decontamination.

[0008] To solve the above problems, the application adopts the following technical solutions:

[0009] An automatic decontamination device for steam generator comprises a spraying mechanism, a pressurizing mechanism and a liquid discharge mechanism, one end of the spraying mechanism, the pressurizing mechanism and the liquid discharge mechanism is arranged in the steam generator;

[0010] The spraying mechanism comprises a decontamination mechanical arm, a decontamination hose is fixed on the decontamination mechanical arm, a spray head is connected to the outlet of the decontamination hose, and a multi-path medicine supply mechanism is connected to the inlet of the decontamination hose.

[0011] The decontamination mechanical arm comprises a mechanical arm fixed segment and a mechanical arm movable segment, one end of the mechanical arm fixed segment is rotatably connected with the mechanical arm movable segment through a rotary link, and one end of the mechanical arm movable segment is rotatably connected with a rotary connecting rod.

[0012] Further, the spraying mechanism and the liquid discharge mechanism are both electrically connected with a control module.

[0013] Further, the mechanical arm fixed segment and the rotary link are coaxial.

[0014] Further, the medicine supply mechanisms of each branch in the multi-path medicine supply mechanism are of the same structure, the medicine supply mechanism comprises a decontamination agent dispensing box, the lower sidewall of the decontamination agent dispensing box is connected with the inlet end of a decontamination agent booster pump, and the outlet end of the decontamination agent booster pump is connected with the inlet end of the decontamination hose.

[0015] Further, the medicine supply mechanism has two paths, and adopts a primary and backup medicine supply mode.

[0016] Further, an electric heater is arranged at the decontamination agent dispensing box.

[0017] Further, the pressurizing mechanism comprises a water supply device, a pressurizing device, a pressurizing hose and a sealing ball which are connected in sequence, the water supply device and the pressurizing device are arranged outside the steam generator, the pressurizing hose is arranged inside the pressurizing hose, and the sealing ball is arranged at the nozzle of the steam generator.

[0018] Further, the liquid discharge mechanism comprises a drain pipe, a drain pump and a waste liquid tank which are connected in sequence, the drain pump and the waste liquid tank are arranged outside the steam generator, and the drain pipe is arranged inside the steam generator.

[0019] In the second aspect, an automatic decontamination method for steam generator is provided, comprising the following steps:

[0020] Sealing the inside of the steam generator by using the pressurizing mechanism;

[0021] The decontamination agent supply mechanism outputs the decontamination agent to the decontamination hose, the decontamination hose is fixed along the mechanical arm fixed segment, the rotary link, the mechanical arm movable segment and the rotary connecting rod on the decontamination mechanical arm, and the 360° spraying of the nozzle at the outlet end of the decontamination hose is realized by the decontamination mechanical arm;

[0022] The inner surface of the steam generator is cleaned by the spraying mechanism.

[0023] The waste liquid is discharged through the drainage mechanism.

[0024] Further, the steam generator is sealed by the pressurizing mechanism, and the steam generator is sealed by the pressurizing mechanism.

[0025] Compared with the prior art, the present application has the following beneficial technical effects:

[0026] The present application provides a kind of steam generator automatic decontamination device, including for the pressurizing mechanism for sealing the inside of steam generator, for the drainage mechanism for discharging the waste liquid after decontamination cleaning in steam generator, for the spraying mechanism for spraying decontamination agent to the inner surface of steam generator, wherein, spraying mechanism includes multiple supply mechanism, decontamination mechanical arm and fixed decontamination hose on decontamination mechanical arm, decontamination hose outlet is connected to nozzle, decontamination mechanical arm is by mechanical arm fixed segment, rotary link, mechanical arm movable segment, rotary connecting rod, nozzle, decontamination hose composition, mechanical arm fixed segment is connected by rotary link and mechanical arm movable segment, mechanical arm fixed segment and rotary link are coaxial, mechanical arm movable segment can rotate 360 degrees.Rotary connecting rod is installed at the top of mechanical arm movable segment, with 360 degree rotation ability, compared with the prior art of the present application and the steam generator decontamination mode, simple structure, better decontamination effect, lower cost and through the form of decontamination hose driven by mechanical arm, can realize more comprehensive and thorough decontamination work.

[0027] Preferably, spraying mechanism and drainage mechanism are electrically connected with control module, work by control instruction of control module, ensure accuracy, reduce labor cost, high automation efficiency, can realize accurate spraying of decontamination agent, make spraying of liquid more uniform, and produce less waste liquid.

[0028] Preferably, the supply mechanism includes a decontamination agent dispensing box, and an electric heater is arranged at the box body of the decontamination agent dispensing box.

[0029] Preferably, the supply mechanism has two paths, and adopts a main and a backup supply mode to improve the redundancy effect and reliability of the device.

[0030] Preferably, the sealing ball at one end of the pressurizing mechanism is installed at the steam generator nozzle and pressure is applied to ensure the sealing property of the inner cavity of the steam generator.

[0031] Preferably, the drain pipe of the liquid drainage mechanism is arranged at the bottom of the inner cavity of the steam generator, and after the decontamination work is completed, the generated waste liquid can be completely drained.

[0032] The application provides an automatic decontamination method for a steam generator, which comprises the following steps: firstly, sealing of the inner part of the steam generator is ensured by a pressurizing mechanism; secondly, a nozzle at the outlet end of a decontamination hose connected with a medicine supply mechanism is driven by a mechanical arm to realize 360° spraying; and finally, waste liquid is drained by a drainage mechanism after cleaning is completed.

[0033] Preferably, before the pressurizing work is performed, the water in the inner cavity of the steam generator is drained, so that the pressure is prevented from being uneven, the pressurizing efficiency is improved, and the corrosion of the steam generator caused by the accelerated water in the high-pressure state is avoided.

[0034] Preferably, the connection of the spraying mechanism and the liquid drainage mechanism is controlled by a control module, so that remote automatic control can be realized, and the working efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 FIG. 1 is a structural diagram of an automatic decontamination device for a steam generator in an embodiment of the application;

[0036] Figure 2 FIG. 2 is a flowchart of an automatic decontamination method for a steam generator in an embodiment of the application.

[0037] 1-1, decontamination agent medicine supply box; 1-2, electric heater; 2, decontamination agent booster pump; 3, decontamination mechanical arm; 3-1, mechanical arm fixed section; 3-2, rotary link; 3-3, mechanical arm movable section; 3-4, rotary connecting rod; 3-5, nozzle; 3-6, decontamination hose; 4, steam generator tube plate; 5, steam generator lower head; 6, steam generator nozzle; 7, steam generator lower head access hole; 8, water supply equipment; 9, pressurizing equipment; 10, pressurizing hose; 11, sealing ball; 12, drain pipe; 13, drainage pump; 14, waste liquid tank; 15, control module. DETAILED DESCRIPTION

[0038] In order to make the technical problems solved by the present application, technical solutions and beneficial effects clearer, the following specific embodiments are used to further explain the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0039] In order to make the technical problems solved by the present application, technical solutions and beneficial effects clearer, the following specific embodiments are used to further explain the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0040] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0041] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0042] In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly specified and limited, if the terms "arrange", "mount", "connect", "connect" appear, they should be understood in a broad sense, for example, can be fixedly connected, can also be detachably connected, or integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] An automatic decontamination device for a steam generator, as shown in Figure 1 The device includes a spraying mechanism, a pressurizing mechanism and a drainage mechanism arranged in the inner cavity of the steam generator, wherein the pressurizing mechanism is used to seal the inside of the steam generator, the spraying mechanism is used to spray decontamination agent to the inner surface of the steam generator to clean the corrosion products and radionuclides on the inner surface of the steam generator, after cleaning, the spraying mechanism is used for cleaning, and finally the waste liquid is discharged through the drainage mechanism, wherein the spraying mechanism can rotate 360° to spray, so that the device decontaminates more completely.

[0044] The spraying mechanism comprises a decontamination mechanical arm 3 and a decontamination hose 3-6 fixed on the decontamination mechanical arm 3, one end of the decontamination hose 3-6 is connected with the multi-path medicine supply mechanism, and the other end is provided with a spray head 3-5; wherein the decontamination mechanical arm 3 comprises a mechanical arm fixed section 3-1, a rotating link 3-2, a mechanical arm movable section 3-3 and a rotating connecting rod 3-4, the mechanical arm fixed section 3-1 is installed at the opening of the lower water chamber of the steam generator, one end of the mechanical arm fixed section 3-1 is located in the lower water chamber of the steam generator, the end is connected with one end of the mechanical arm movable section 3-3 through the rotating link 3-2, the other end of the mechanical arm movable section 3-3 is connected with the rotating connecting rod 3-4, and one end of the decontamination hose 3-6 provided with the spray head 3-5 is flush with the end of the rotating connecting rod 3-4, wherein the rotating connecting rod 3-4 is fixedly connected with the mechanical arm movable section 3-3, the mechanical arm movable section 3-3 can rotate by 360 degrees, thereby driving the rotating connecting rod 3-4 and the decontamination hose 3-6 to rotate, and the spraying of the decontamination agent is completed.

[0045] In an optional embodiment, the spraying mechanism and the liquid discharge mechanism are both connected with the control module 15, and the control module 15 is controlled to complete the decontamination treatment of the inner surface of the steam generator.

[0046] In the embodiment, an automatic decontamination device for a steam generator is provided, which comprises a spraying mechanism, a pressurizing mechanism and a liquid discharge mechanism, one end of the spraying mechanism, the pressurizing mechanism and the liquid discharge mechanism is arranged in the steam generator, the spraying mechanism comprises a decontamination mechanical arm 3 and a decontamination hose 3-6 fixed on the decontamination mechanical arm 3, one end of the decontamination hose 3-6 is connected with the multi-path medicine supply mechanism, and the other end is provided with a spray head 3-5; wherein the decontamination mechanical arm 3 comprises a mechanical arm fixed section 3-1, a rotating link 3-2, a mechanical arm movable section 3-3 and a rotating connecting rod 3-4, the mechanical arm fixed section 3-1 is installed at the opening of the lower water chamber of the steam generator, one end of the mechanical arm fixed section 3-1 is located in the lower water chamber of the steam generator, the end is connected with one end of the mechanical arm movable section 3-3 through the rotating link 3-2, the other end of the mechanical arm movable section 3-3 is connected with the rotating connecting rod 3-4, and one end of the decontamination hose 3-6 provided with the spray head 3-5 is flush with the end of the rotating connecting rod 3-4, wherein the rotating connecting rod 3-4 is fixedly connected with the mechanical arm movable section 3-3, and the mechanical arm movable section 3-3 can rotate by 360 degrees.

[0047] Optionally, the mechanical arm fixed section 3-1 and the rotating link 3-2 are coaxial;

[0048] The medicine supply mechanisms of the branches in the multi-path medicine supply mechanism are the same in structure, the medicine supply mechanism has two paths, and a main and a backup medicine supply mode is adopted, the medicine supply mechanism comprises a decontamination agent preparation box 1-1, the lower sidewall of the decontamination agent preparation box 1-1 is connected with the inlet end of a decontamination agent booster pump 2, and the outlet end of the decontamination agent booster pump 2 is connected with the decontamination hose 3-6;

[0049] To ensure the temperature requirement of the detergent in the detergent dispensing box 1-1, an electric heater 1-2 is arranged at the box body of the detergent dispensing box 1-1;

[0050] Specifically, the electric heater 1-2 and the detergent booster pump 2 are connected with the control module 15, and the control module 15 is used to control the electric heater 1-2 to heat the detergent in the detergent dispensing box (1-1) and control the detergent booster pump 2 to complete the delivery of the detergent.

[0051] In the embodiment, the steam generator automatic decontamination device comprises a spraying mechanism, a pressurizing mechanism and a liquid discharging mechanism, one end of the spraying mechanism, the pressurizing mechanism and the liquid discharging mechanism is arranged in the steam generator, the spraying mechanism comprises a decontamination mechanical arm 3 and a decontamination hose 3-6 fixed on the decontamination mechanical arm 3, one end of the decontamination hose 3-6 is connected with a multi-way medicine supply mechanism, and the other end is provided with a spray head 3-5; wherein the decontamination mechanical arm 3 comprises a mechanical arm fixed segment 3-1, a rotating link 3-2, a mechanical arm movable segment 3-3 and a rotating connecting rod 3-4, the mechanical arm fixed segment 3-1 is installed at the opening of the lower water chamber of the steam generator, one end of the mechanical arm fixed segment 3-1 is located in the lower water chamber of the steam generator, the end is connected with one end of the mechanical arm movable segment 3-3 through the rotating link 3-2, the other end of the mechanical arm movable segment 3-3 is connected with the rotating connecting rod 3-4, and one end of the decontamination hose 3-6 provided with the spray head 3-5 is flush with the end of the rotating connecting rod 3-4, wherein the rotating connecting rod 3-4 is fixedly connected with the mechanical arm movable segment 3-3, and the mechanical arm movable segment 3-3 can rotate by 360°.

[0052] The pressurizing mechanism comprises a water supply device 8, a pressurizing device 9 and a pressurizing hose 10, the water supply device 8, the pressurizing device 9 and the pressurizing hose 10 are connected in sequence, a sealing ball 11 is connected at one end of the pressurizing hose 10, the water supply device 8 and the pressurizing device 9 are located outside the steam generator, the pressurizing hose 10 and the sealing ball 11 are located in the inner cavity of the steam generator, a steam generator nozzle 6 is opened on the steam generator, the sealing ball 11 is located at the steam generator nozzle 6, the inner cavity of the steam generator is pressurized through the water supply device 8 and the pressurizing device 9, so that the sealing ball 11 is inserted into the steam generator nozzle 6, and the sealing of the inner cavity of the steam generator is completed.

[0053] In the embodiment, the steam generator automatic decontamination device comprises a spraying mechanism, a pressurizing mechanism and a liquid discharge mechanism, one end of the spraying mechanism, the pressurizing mechanism and the liquid discharge mechanism is arranged in the steam generator, the spraying mechanism comprises a decontamination mechanical arm 3 and a decontamination hose 3-6 fixed on the decontamination mechanical arm 3, one end of the decontamination hose 3-6 is connected with a multi-way medicine supply mechanism, and the other end is provided with a spray head 3-5; wherein the decontamination mechanical arm 3 comprises a mechanical arm fixed segment 3-1, a rotary link 3-2, a mechanical arm movable segment 3-3 and a rotary connecting rod 3-4, the mechanical arm fixed segment 3-1 is installed at an opening of a lower water chamber of the steam generator, one end of the mechanical arm fixed segment 3-1 is located in the lower water chamber of the steam generator, the end is connected with one end of the mechanical arm movable segment 3-3 through the rotary link 3-2, the other end of the mechanical arm movable segment 3-3 is connected with the rotary connecting rod 3-4, and one end of the decontamination hose 3-6 provided with the spray head 3-5 is flush with the end of the rotary connecting rod 3-4, wherein the rotary connecting rod 3-4 is fixedly connected with the mechanical arm movable segment 3-3, and the mechanical arm movable segment 3-3 can rotate by 360 degrees.

[0054] The liquid discharge mechanism comprises a waste liquid tank 14, a liquid discharge pump 13 and a liquid discharge pipe 12 connected in sequence, wherein the waste liquid tank 14 and the liquid discharge pump 13 are located outside the steam generator, and one end of the liquid discharge pipe 12 is located in the inner cavity of the steam generator, in particular, the liquid discharge pipe 12 is located at the bottom of the inner cavity of the steam generator, so that the waste water can be completely discharged.

[0055] The liquid discharge pump 13 is also connected with the control module 15, and the waste liquid after cleaning is discharged by controlling the working of the liquid discharge pump 13 through the control module 15.

[0056] In another embodiment of the present application, the steam generator automatic decontamination device comprises a decontamination agent medicine supply tank 1-1, an electric heater 1-2, a decontamination agent booster pump 2, a decontamination mechanical arm 3, a mechanical arm fixed segment 3-1, a rotary link 3-2, a mechanical arm movable segment 3-3, a rotary connecting rod 3-4, a spray head 3-5, a decontamination hose 3-6, a steam generator tube plate 4, a steam generator lower head 5, a steam generator nozzle 6, a steam generator lower head maintenance hole 7, a water supply device 8, a pressurizing device 9, a pressurizing hose 10, a sealing ball 11, a liquid discharge pipe 12, a liquid discharge pump 13, a waste liquid tank 14 and a control module 15.

[0057] The decontamination agent medicine supply tank 1-1, the electric heater 1-2 and the decontamination agent booster pump 2 are in parallel connection and have two columns, one is used and the other is standby. The outlets of the two decontamination agent booster pumps 2 are connected to the decontamination hose 3-6 through pipelines.

[0058] The decontamination mechanical arm 3 is composed of the mechanical arm fixed segment 3-1, the rotary link 3-2, the mechanical arm movable segment 3-3, the rotary connecting rod 3-4, the spray head 3-5 and the decontamination hose 3-6, wherein the outlet of the decontamination hose 3-6 is connected to the spray head 3-5.

[0059] The fixed section 3-1 of the robotic arm is connected to the movable section 3-3 of the robotic arm via a rotary link 3-2. The fixed section 3-1 and the rotary link 3-2 are coaxial, and the movable section 3-3 can rotate 360 ​​degrees. A rotary link 3-4 is installed at the top of the movable section 3-3, providing 360-degree rotation capability.

[0060] The fixed section 3-1 of the robotic arm is installed in the inspection hole 7 of the lower end cap of the steam generator. The rotating link 3-2, the movable section 3-3 of the robotic arm, the rotating connecting rod 3-4, the nozzle 3-5, and the decontamination hose 3-6 are all located in the chamber formed by the tube sheet 4 of the steam generator and the lower end cap 5 of the steam generator.

[0061] The water supply device 8 and the pressurization device 9 are located outside the lower head 5 of the steam generator. The water supply device 8, the pressurization device 9, the pressurization hose 10, and the sealing ball 11 are connected in sequence. The sealing ball 11 is installed inside the steam generator nozzle 6 and serves a sealing function.

[0062] The inlet of the drain pipe 12 is located at the bottom of the lower end cap 5 of the steam generator, and the outlet is connected to the waste liquid tank 14 via the drain pump 13.

[0063] Control module 15 can remotely control electric heater 1-2, detergent booster pump 2, rotary link 3-2, robotic arm movable section 3-3, rotary linkage 3-4, and drain pump 13.

[0064] This invention also provides an automatic decontamination method for a steam generator, such as... Figure 2 As shown, it includes the following steps:

[0065] The inside of the steam generator is sealed using a pressurization mechanism;

[0066] The drug supply mechanism outputs the detergent to the detergent hose 3-6. The detergent hose 3-6 is fixed along the fixed section 3-1, the rotary link 3-2, the movable section 3-3 and the rotating link 3-4 of the detergent robotic arm 3. The nozzle 3-5 at the outlet end of the detergent hose 3-6 is driven by the detergent robotic arm 3 to spray out 360°.

[0067] The inner surface of the steam generator is cleaned using a spraying mechanism;

[0068] Waste liquid is discharged through a drainage system;

[0069] Before carrying out the decontamination work, the water inside the steam generator is first drained, and then the inside of the steam generator is sealed by using a pressurization mechanism. The sealing ball 11 is installed inside the steam generator nozzle 6 to achieve the sealing effect.

[0070] The detailed steps of the decontamination method based on the device of the present invention are as follows:

[0071] (1) Nuclear power unit shutdown, the water in the lower head 5 of the steam generator is emptied, and the lower head access hole 7 of the steam generator is opened.

[0072] (2) The sealing ball 11 is installed inside the steam generator nozzle 6, the sealing ball 11 is pressurized to the rated pressure by using the water supply device 8 and the pressurizing device 9, and the sealing effect is achieved.

[0073] (3) The foam decontamination agent is prepared in the decontamination agent preparation box 1-1, and the electric heater 1-2 is used to maintain the required temperature range.

[0074] (4) Start a decontamination agent booster pump 2, and use the control module 15 to automatically or manually control the decontamination mechanical arm 3 (the movable section 3-3 and the rotating connecting rod 3-4) to spray the foam decontamination agent to the inner surface of the lower head 5 of the steam generator.

[0075] (5) After the foam decontamination agent is sprayed, the decontamination agent booster pump 2 is used to spray clean water to the inner surface of the lower head 5 of the steam generator until the foam is cleaned.

[0076] (6) The waste liquid generated in step (5) is pumped by the drainage pump 13 and discharged into the waste liquid tank 14.

[0077] (7) Repeat steps (3) to (6) according to actual needs

[0078] (8) After decontamination, remove the decontamination mechanical arm 3, the pressurizing hose 10, the sealing ball 11, and the drain pipe 12. Close the lower head access hole 7 of the steam generator.

[0079] The preferred embodiments of the application are described in detail above, but the application is not limited thereto. Within the technical concept of the application, various simple modifications can be made to the technical solutions of the application, including the combination of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as disclosed by the application and fall within the protection scope of the application.

Claims

1. An automatic decontamination apparatus for a steam generator, characterized in that, The steam generator automatic decontamination device comprises a spraying mechanism, a pressurizing mechanism and a liquid discharge mechanism, one end of the spraying mechanism, the pressurizing mechanism and the liquid discharge mechanism is arranged in the steam generator; The spraying mechanism comprises a decontamination mechanical arm (3), a decontamination hose (3-6) is fixed on the decontamination mechanical arm (3), a spray head (3-5) is connected to the outlet of the decontamination hose (3-6), and a multi-path medicine supply mechanism is connected to the inlet of the decontamination hose (3-6); The decontamination mechanical arm (3) comprises a mechanical arm fixed section (3-1) and a mechanical arm movable section (3-3), one end of the mechanical arm fixed section (3-1) is rotationally connected with the mechanical arm movable section (3-3) through a rotating link (3-2), and one end of the mechanical arm movable section (3-3) is rotationally connected with a rotating connecting rod (3-4); The pressurizing mechanism comprises sequentially connected water supply equipment (8), pressurizing equipment (9), a pressurizing hose (10) and a sealing ball (11), the water supply equipment (8) and the pressurizing equipment (9) are arranged outside the steam generator, the pressurizing hose (10) is arranged inside the pressurizing hose (10), and the sealing ball (11) is arranged at a steam generator nozzle (6).

2. The automatic decontamination apparatus for a steam generator according to claim 1, characterized by The spraying mechanism and the liquid discharge mechanism are both electrically connected with a control module (15).

3. The automatic decontamination apparatus for steam generators according to claim 1, characterized in that, The mechanical arm fixed section (3-1) and the rotating link (3-2) are coaxial.

4. The automatic decontamination apparatus for steam generators according to claim 1, characterized in that, The medicine supply mechanisms in the multi-path medicine supply mechanism are the same in structure, the medicine supply mechanism comprises a decontaminant medicine preparation box (1-1), the lower side wall of the decontaminant medicine preparation box (1-1) is connected with the inlet end of a decontaminant booster pump (2), and the outlet end of the decontaminant booster pump (2) is connected with the inlet end of the decontamination hose (3-6).

5. The automatic decontamination apparatus for steam generators according to claim 1 or 4, characterized in that, The medicine supply mechanism has two paths, and adopts a primary and backup medicine supply mode.

6. The automatic decontamination apparatus for steam generators according to claim 4, characterized in that, An electric heater (1-2) is arranged at the decontaminant medicine preparation box (1-1).

7. The automatic decontamination apparatus for steam generators according to claim 1, characterized in that, The liquid discharge mechanism comprises sequentially connected drain pipes (12), a drain pump (13) and a waste liquid tank (14), the drain pump (13) and the waste liquid tank (14) are arranged outside the steam generator, and the drain pipes (12) are arranged inside the steam generator.

8. An automatic decontamination method for a steam generator, characterized by, The steam generator automatic decontamination device according to any one of claims 1-7 comprises the following steps: The inside of the steam generator is sealed by the pressurizing mechanism; The medicine supply mechanism outputs the decontaminant to the decontamination hose (3-6), the decontamination hose (3-6) is fixed along the mechanical arm fixed section (3-1), the rotating link (3-2), the mechanical arm movable section (3-3) and the rotating connecting rod (3-4) of the decontamination mechanical arm (3), and the spray head (3-5) at the outlet end of the decontamination hose (3-6) is driven by the decontamination mechanical arm (3) to realize 360° spraying; The inside surface of the steam generator is cleaned by the spraying mechanism; The waste liquid is discharged by the liquid discharge mechanism.

9. The method of claim 8 wherein, Before the inside of the steam generator is sealed by the pressurizing mechanism, the water in the inside of the steam generator is first discharged.

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