High-temperature cleaning device and method for lead-bismuth stack spiral tube type steam generator

Abstract

The invention discloses a high-temperature cleaning device and method for a lead-bismuth stack spiral tube type steam generator, and the device comprises a pure water tank which is used for containing pure water; the medicament tank is used for containing medicaments; the flushing pipeline is used for conveying a medicament or pure water to the steam generator; the cooling and steam fog collecting assembly is used for condensing and recycling the liquid passing through the steam generator; the recovery pipeline is used for conveying condensed and recovered liquid to the circulating cleaning tank; the circulating cleaning tank is connected with the pure water tank, the medicament tank, the flushing pipeline and the recycling pipeline, and a stirrer is arranged in the circulating cleaning tank and used for mixing recycled liquid and medicaments in the medicament tank. According to the high-temperature cleaning device and method for the lead-bismuth stack spiral tube type steam generator, the lead-bismuth stack spiral tube type steam generator can be cleaned at the high temperature of 200 DEG C or above without shutdown.

Description

Technical Field

[0001] The present invention relates to a high-temperature cleaning device and method for a lead-bismuth reactor helical tube steam generator, belonging to the field of nuclear power technology. Background Art

[0002] The steam generator is one of the most widely used devices in the nuclear power industry. The heat exchange tubes are the core components of the steam generator, responsible for heat energy exchange. The fouling of the heat exchange tubes will seriously affect the working performance of the steam generator. Therefore, the cleaning of the heat exchange tubes is an important measure to extend the life of the steam generator, maintain production efficiency and full operation. Relevant data shows that the waste and losses caused by the decline in the heat transfer efficiency of the steam generator due to the fouling of the heat exchange tubes are very large. Cleaning can not only achieve the efficient operation of the equipment, but also extend the life of the equipment.

[0003] In the field of nuclear power, the existing cleaning methods generally use steam and hydraulic flushing or mechanical methods to remove scale after shutdown maintenance. The cleaning window period is short, and the cleaning cycle seriously depends on the overall equipment working state, and it is impossible to clean dynamically according to the actual situation of the steam generator.

[0004] Although there are also non-stop cleaning methods in the existing technology, in non-stop cleaning, most of the power station units targeted by the traditional thermal equipment descaling cleaning are cleaned at 90°C. However, in the field of nuclear power, especially for the lead-bismuth reactor helical tube steam generator, due to the inherent properties of the lead-bismuth eutectic alloy coolant, the design requires that the in-service cleaning and maintenance of the lead-bismuth reactor steam generator tube bundle be completed above 200°C. The existing non-stop cleaning methods cannot achieve effective cleaning in an environment above 200°C.

[0005] In addition, the traditional non-stop cleaning methods generally use inorganic strong acids, such as HCl, HF, etc. However, in the cleaning of the lead-bismuth reactor helical tube steam generator, in order to maintain the system temperature of 200°C without loss, the cleaning requires to be carried out at ultra-high temperature, and the traditional inorganic strong acids are not applicable.

[0006] Therefore, it is necessary to conduct in-depth research on the existing high-temperature cleaning devices and methods for steam generators to solve the above problems. Summary of the Invention

[0007] In order to overcome the above problems, the inventor of the present invention has conducted in-depth research and designed a high-temperature cleaning device for a lead-bismuth reactor helical tube steam generator, including:

[0008] A pure water tank for containing pure water;

[0009] A chemical tank for containing chemicals;

[0010] A flushing pipeline for transporting chemicals or pure water to the steam generator,

[0011] Cooling and mist collection assembly, which condenses and recovers the liquid passing through the steam generator,

[0012] Recovery pipeline, which transports the condensed and recovered liquid to the circulating cleaning tank,

[0013] Circulating cleaning tank, which is connected to the pure water tank, the chemical agent tank, the flushing pipeline, and the recovery pipeline, and is provided with a stirrer to mix the recovered liquid and the chemical agent in the chemical agent tank.

[0014] In a preferred embodiment, the flushing pipeline is arranged in the reactor building, and the pipeline is made of heat-conducting material.

[0015] In a preferred embodiment, a pressure reducing valve is arranged on the flushing pipeline.

[0016] In a preferred embodiment, a thermometer is arranged on the flushing pipeline.

[0017] In a preferred embodiment, the cooling and mist collection assembly includes a condenser and a vapor-liquid collection tank. The high-temperature gas-liquid passing through the steam generator is condensed by the condenser and collected in the vapor-liquid collection tank.

[0018] In a preferred embodiment, a flow sensor is arranged on the recovery pipeline.

[0019] In a preferred embodiment, a PH detector is arranged on the recovery pipeline.

[0020] In a preferred embodiment, a pressure gauge and a pressure supplement pipeline are arranged on the circulating cleaning tank and / or the chemical agent replenishment tank.

[0021] The present invention also discloses a high-temperature cleaning chemical agent for a lead-bismuth reactor helical tube steam generator, and the cleaning chemical agent includes ATMP, HEDP, DT-102, and Lan826.

[0022] The present invention also discloses a high-temperature cleaning method for a lead-bismuth reactor helical tube steam generator, including the following steps:

[0023] S1. Connect the cleaning device to the steam generator and flush the steam generator with pure water;

[0024] S2. Flush the steam generator with the cleaning chemical agent;

[0025] S4. Rinse the steam generator to complete the cleaning.

[0026] The beneficial effects of the present invention include:

[0027] (1) Realize the high-temperature cleaning of the lead-bismuth reactor helical tube steam generator above 200 °C without shutting down;

[0028] (2) The device is safe and reliable, and the cleaning effect is stable. Description of the Drawings

[0029] Figure 1 Shows a schematic structural diagram of a high-temperature cleaning device for a lead-bismuth reactor helical tube steam generator according to a preferred embodiment of the present invention.

[0030] Explanation of the Reference Numerals in the Drawings:

[0031] 1 - Pure water tank;

[0032] 2 - Chemical agent tank;

[0033] 3 - Flushing pipeline;

[0034] 4 - Mist collection assembly;

[0035] 5 - Recovery pipeline;

[0036] 6 - Circulating cleaning tank;

[0037] 7 - Steam generator;

[0038] 31 - Pressure reducing valve;

[0039] 32 - Pressure gauge;

[0040] 33 - Flow sensor;

[0041] 34 - Thermometer;

[0042] 35 - Filter;

[0043] 41 - Condenser;

[0044] 42 - Vapor-liquid collection box;

[0045] 43 - Buffer;

[0046] 51 - Detector;

[0047] 52 - Cleanliness detector. Detailed Description of the Embodiment

[0048] The present invention will be further described in detail below with reference to the drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become more clearly defined.

[0049] The special term "exemplary" here means "serving as an example, embodiment, or illustration". Any embodiment described as "exemplary" here does not have to be construed as superior to or better than other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings do not have to be drawn to scale unless otherwise specified.

[0050] A high-temperature cleaning device for a lead-bismuth reactor helical tube steam generator provided by the present invention, as Figure 1 shown, includes:

[0051] A pure water tank 1 for containing pure water;

[0052] A chemical agent tank 2 for containing chemical agents;

[0053] A flushing pipeline 3 for transporting chemical agents or pure water to the steam generator,

[0054] A cooling and mist collection assembly 4 for condensing and recovering the liquid passing through the steam generator,

[0055] A recovery pipeline 5 for transporting the condensed and recovered liquid to a circulating cleaning tank,

[0056] A circulating cleaning tank 6 is connected to the pure water tank, the chemical agent tank, the flushing pipeline, and the recovery pipeline, and is provided with a stirrer for mixing the recovered liquid and the chemical agent in the chemical agent tank.

[0057] According to the present invention, a water pump is provided on the flushing pipeline to pump the liquid.

[0058] The flushing pipeline 3 is arranged in the reactor building, and it adopts a metal pipeline. Utilizing the high-temperature environment in the reactor building, the liquid in the pipeline is heated so that the temperature of the liquid in the pipeline reaches above 200 °C before entering the steam generator.

[0059] When the temperature of the liquid in the pipeline rises, a relatively large pressure will be generated in the pipeline. Preferably, a pressure reducing valve 31 is provided on the flushing pipeline to avoid excessive pressure of the liquid in the pipeline.

[0060] In a preferred embodiment, a pressure gauge 32 is provided on the flushing pipeline for monitoring the pressure of the liquid in the pipeline.

[0061] More preferably, there are two pressure gauges 32, which are respectively arranged at the front and rear ends of the pressure reducing valve.

[0062] Preferably, the pressure range of the liquid entering the steam generator is 2.5 - 3.0 Mpa. This pressure range takes into account both the impact strength of the liquid and the cleaning effect.

[0063] In a preferred embodiment, a second branch is further provided on the flushing pipeline. There are no filters and pressure reducing valves on this branch, and it is directly connected to the water pump and the steam generator. Its function is to open the branch during the process of cleaning the filter to ensure the normal operation of the cleaning.

[0064] In a preferred embodiment, a flow sensor 33 is provided on the flushing pipeline for monitoring the flow rate of the liquid entering the steam generator.

[0065] In a preferred embodiment, a thermometer 34 is provided on the flushing pipeline to detect the temperature of the liquid in the pipeline. When the temperature is too low, the flow rate is reduced by adjusting the pump speed, so as to ensure the temperature of the liquid entering the steam generator.

[0066] In a preferred embodiment, a filter 35 is provided on the flushing pipeline to filter the liquid entering the steam generator.

[0067] According to a preferred embodiment of the present invention, the flushing pipeline is connected to the steam generator 7 through a flange. After the liquid in the cleaning pipeline passes through the steam generator, it enters the cooling and mist collection assembly 4.

[0068] The cooling and mist collection assembly 4 includes a condenser 41 and a vapor-liquid collection tank 42. The high-temperature gas-liquid passing through the steam generator is condensed by the condenser and collected in the vapor-liquid collection tank.

[0069] In a preferred embodiment, the cooling and mist collection assembly further includes a buffer 43 to reduce the liquid flow rate through the buffer, so as to achieve better cooling.

[0070] In a preferred embodiment, a sewage outlet is provided at the upper bottom of the vapor-liquid collection tank for discharging the liquid therein.

[0071] Both the buffer and the condenser are common devices in the heat exchange system. In the present invention, their specific structures or models are not limited, and those skilled in the art can freely choose according to actual needs.

[0072] Preferably, the cooling and mist collection assembly further includes a cooling fan to ensure a low-temperature environment for the condenser.

[0073] According to the present invention, the recovery pipeline is connected to the vapor-liquid collection tank through a water pump.

[0074] According to the present invention, a filter 35 is provided on the recovery pipeline to filter the liquid collected by the vapor-liquid collection tank to remove the residues generated during the cleaning of the steam generator.

[0075] In a preferred embodiment, a flow sensor 33 is provided on the recovery pipeline to detect the flow rate of the recovery pipeline, and the dosage of the medicine supplemented by the medicine replenishing tank is adjusted according to the flow rate.

[0076] In a preferred embodiment, a PH detector 51 is provided on the recovery pipeline to detect the PH of the recovered liquid for obtaining the remaining content of the medicine in the recovered liquid.

[0077] Preferably, based on the flow rate and pH of the recovery pipeline, the amount of liquid mixed from the replenishing tank into the circulating cleaning tank is adjusted so that the pH of the liquid entering the steam generator is between 3.5 and 4.0.

[0078] According to the present invention, after the steam generator is cleaned with the agent, it needs to be flushed to remove the agent residue. In a preferred embodiment, a cleanliness detector 52 is provided on the recovery pipeline to detect whether there is agent residue in the liquid in the pipeline during the flushing process.

[0079] In the present invention, there is no limitation on the specific model of the cleanliness detector, as long as it can perform the drug residue detection, for example, the Xike water cleanliness detector can be used.

[0080] In a preferred embodiment, the circulating cleaning tank and / or the medicine replenishing tank are provided with a pressure gauge and a pressure replenishing pipe, and the pressure replenishing pipe is connected to high-pressure nitrogen. When the pressure in the pipeline is insufficient, the pressure is replenished by high-pressure nitrogen.

[0081] The inventors found that a low oxygen environment improves the high temperature stability of the solvent and reduces the probability of oxygen decomposing the complexing agent at high temperatures. Therefore, nitrogen is used instead of air for pressure replenishment in the present invention.

[0082] According to the present invention, liquid pressure is closely related to the cleaning effect. When the pressure in the pipeline is insufficient, high-pressure nitrogen is used to supplement the pressure, thereby ensuring the cleaning effect.

[0083] According to the present invention, a water pump is provided between the circulation cleaning tank and the medicine replenishing tank, for extracting the medicine in the medicine replenishing tank into the circulation cleaning tank.

[0084] Furthermore, the amount of medicine extracted from the medicine replenishing tank is determined according to the detection value of the pH detector on the recovery pipeline, and the quality of the medicine entering the steam generator is ensured through dynamic adjustment. The specific proportion can be freely set by technical personnel in this field according to actual needs and is not limited in the present invention.

[0085] According to the present invention, the water in the pure water tank is used to flush the steam generator before cleaning with chemicals, to clean the dirty attachments on the surface of the steam generator, to reduce its consumption of chemicals, and to improve cleaning efficiency. The liquid after flushing is discharged through the drain outlet on the steam-liquid collection box.

[0086] In a preferred embodiment, the flushing pipeline also includes a third branch, which connects the water inlet and outlet of the steam generator and is provided with a valve so that the flushing pipeline can flush the steam generator in both forward and reverse directions.

[0087] Traditional non-stop cleaning methods generally use inorganic strong acids such as HCl and HF. However, in the cleaning of the helical tube steam generator of a lead-bismuth reactor, to maintain the system temperature at 200°C without loss, the cleaning requires high-temperature operation, and traditional inorganic strong acids are not applicable.

[0088] In the present invention, the cleaning agent is specifically designed to adapt to the cleaning of the heat exchange tubes of the helical tube steam generator of a lead-bismuth reactor under the condition of 200°C.

[0089] The agent includes ATMP, HEDP, DT-102, and Lan826.

[0090] ATMP (amino trimethylene phosphonic acid) is an organic phosphate scale inhibitor with excellent chelating, dispersing, and lattice distortion effects. It can effectively prevent the formation of scale by scale-forming salts in water.

[0091] HEDP (1-hydroxyethylidene-1,1-diphosphonic acid) is a polybasic acid with stable structure and not easily hydrolyzed. It has excellent chelating ability and can form stable complexes with various metal ions such as calcium, magnesium, copper, and zinc. It also has good deactivation effects on many metal inorganic salts such as CaSO4, CaCO3, and MgSiO3.

[0092] DT-102 (sodium polymaleate) is a sodium salt of hydrolyzed polymaleic acid with high chemical and thermal stability. Its decomposition temperature is above 330°C, and it still has good scale inhibition and dispersion effects on carbonates below 300°C.

[0093] Lan826 is a general-purpose pickling inhibitor applicable to chemical cleaning with various organic and inorganic acids. It has excellent ability to inhibit hydrogen absorption by steel during pickling and inhibit the accelerated corrosion ability of Fe3+.

[0094] Furthermore, the components of the agent are (by weight, the rest is water):

[0095] ATMP: 0.84% - 1.22%;

[0096] HEDP: 1.3% - 1.52%;

[0097] DT-102: 2.8% - 3.3%;

[0098] Lan826: 0.33% - 0.4%.

[0099] The combination of the above components is obtained by the inventor through a large number of studies and summaries. Through actual process experiments, it can achieve high-temperature cleaning at 200°C, and the agent has the following characteristics:

[0100] a) It has stable performance in a high-temperature environment;

[0101] b) It is not easy to be hydrolyzed;

[0102] c) It has cleaning and descaling performance;

[0103] d) Clean and pollution-free;

[0104] e) Be compatible with heat exchange tubes;

[0105] f) Compatible with the cleaning system.

[0106] The present invention also discloses a high-temperature cleaning method for a lead-bismuth pile spiral tube steam generator, which is performed using the lead-bismuth pile spiral tube steam generator high-temperature cleaning device, and comprises the following steps:

[0107] S1. Connect the cleaning device to the steam generator and rinse the steam generator with pure water;

[0108] S2. Flushing the steam generator with a cleaning agent;

[0109] S4, rinsing the steam generator to complete the cleaning.

[0110] Preferably, there is a step S3 between S2 and S4, of flushing the steam generator with ammonia water.

[0111] In the present invention, the reagent is acidic, and residual reagent adhering to the surface of the steam generator will cause corrosion damage to it. By flushing the steam generator with ammonia water, alkaline protection can be formed on the surface of the steam generator, thereby increasing the service life of the steam generator.

[0112] Preferably, in S1, the flushing direction is switched during the flushing process, and the steam generator is flushed from both the forward direction and the reverse direction.

[0113] More preferably, the flushing direction is switched multiple times. More preferably, during each switching process, the flushing time in each direction is not less than 15 minutes.

[0114] Preferably, in S1, during the flushing process, the flushing flow rate is greater than 2 m / s, for example, the flushing flow rate is 3 m / s, and the flushing time is not less than 2 hours, for example, the flushing is 3 hours.

[0115] In the present invention, before using chemicals to clean the steam generator, the steam generator is cleaned with pure water. On the one hand, the stability and airtightness of the cleaning device can be tested, and on the other hand, the attachments on the inner surface of the steam generator can be preliminarily cleaned, thereby reducing the amount of chemicals used in the later stage and improving the cleaning efficiency.

[0116] According to the present invention, the pure water used for flushing is directly discharged through the drain port on the gas-liquid collecting box without being recycled.

[0117] In S2, the chemicals entering the steam generator during the cleaning process are recycled.

[0118] Further, in S2, the liquid entering the flushing steam generator is adjusted, preferably to have a pH of 3.5 - 4.0.

[0119] Preferably, by detecting the pH and flow rate of the liquid in the recycling pipeline, and adjusting the amount of chemical liquid mixed from the chemical replenishment tank into the circulating cleaning tank, the pH of the liquid entering the steam generator is made to be between 3.5 and 4.0.

[0120] Preferably, in S2, the cleaning flow rate is set to 0.5 m / s - 1.5 m / s, for example 0.8 m / s, so that the chemicals can better clean the dirt in the steam generator.

[0121] Preferably, in S2, the cleaning time is greater than or equal to 16 hours.

[0122] In S3, the steam generator is cleaned by adding ammonia water to the circulating cleaning tank. Preferably, the pH of the liquid is adjusted to 10 - 10.5 using ammonia water.

[0123] Preferably, in S3, the flushing time is greater than or equal to 1 hour.

[0124] In S4, preferably, a hydrazine - ammonia water aqueous solution is used for rinsing.

[0125] Preferably, the pH of the hydrazine - ammonia water aqueous solution is 10.0 - 10.5.

[0126] Preferably, the flow rate of the hydrazine - ammonia water aqueous solution is 2 m / s - 4 m / s, for example 3 m / s.

[0127] Preferably, the flushing time of the hydrazine - ammonia water aqueous solution is not less than 1 hour.

[0128] Preferably, after S4 is completed, a cleanliness detector is used to detect the flushing liquid to determine whether there is chemical residue in the solution. If there is chemical residue, step S4 is repeated.

[0129] Examples

[0130] Example 1

[0131] Tests were conducted on the high - temperature cleaning chemicals for the lead - bismuth reactor helical - tube steam generator. The high - temperature cleaning chemicals for the lead - bismuth reactor helical - tube steam generator include ATMP, HEDP, DT - 102, and Lan826. The component ratios of the chemicals are as follows:

[0132] ATMP: 1%;

[0133] HEDP: 1.5%;

[0134] DT-102: 3%;

[0135] Lan826: 0.35%;

[0136] The rest is water.

[0137] The test process includes the following steps:

[0138] (1) Direct tap water is fed into a 5Kw 316 stainless steel water boiler to boil and form scale.

[0139] (2) Select light-colored and slightly transparent insoluble calcite-type scale pieces.

[0140] (3) Randomly take scale samples and send them to a third-party for testing. Reserve ≥10g of scale samples for archiving.

[0141] (4) First, roll and press with a 5N smooth pressing plate, and then screen hard and dense scale pieces with a 5-mesh vibrating screen (aperture ≥4mm).

[0142] (5) Bake the scale pieces in a 60°C constant temperature oven for 30 minutes until cooled to room temperature before use.

[0143] (6) Weigh when taking, place on a grid measuring plate to confirm the scale piece specifications, and make records.

[0144] (7) Add 6L of pure water into the kettle. Then, place the earthenware bowl containing 20g of scale at the bottom of the kettle and hang the corrosion test piece. Subsequently, close the kettle lid and tighten the bolts, leaving only the pressure relief valve open, close all other valves, and introduce nitrogen to raise the kettle pressure to 0.2MPa and then close the valve. Then, use a leak detector to check and confirm the good seal. Next, turn on the power supply and set respectively: temperature ≥200°C; rotation speed 70r / min; time 72h; finally, open the cooling valve of the magnetic stirrer, turn on the stirrer and heating power supply, and start heating inside the kettle.

[0145] (8) When the operating temperature rises to 110°C, first open the air release valve to exhaust for 15 seconds and then close the valve. Then, inject 0.5L of pre-prepared hydrazine solution (concentration 60ppm) into the high-level feeding tank. Then, close the upper valve of the feeding tank, open the lower valve of the feeding tank. After the ammonia liquid completely flows into the kettle, close the lower valve. Subsequently, turn on the nitrogen valve to raise the system pressure to 2.5MPa and then close the valve, and continue to maintain the operation.

[0146] (9) When the temperature inside the kettle reaches 200°C, add 1.5L of the prepared chemical agent from the feeding tank, with a total of 8L. At the same time, turn on the timer on the control panel to start the experiment timing.

[0147] (10) The total running time is 72 hours, and the process temperature and pressure are always maintained at >200 °C / 2.5 MPa. During the test, the liquid in the kettle is detected regularly. After the test, the scale dissolution rate is detected. The "pass rate of passing through a 60 or 80 mesh filter screen" is used as the scale dissolution rate. Based on the total mass of the scale (m0) placed in the reaction kettle before the reaction, and the mass (m i ) of the residue filtered from the furnace water with different specifications of filter screens after the reaction, it is calculated according to the following formula:

[0148]

[0149] Among them, C i represents the passing rate of the residue with different specifications of filter screens; m0 represents the total mass of the scale; m i represents the mass of the residue filtered by different specifications of filter screens.

[0150] Comparative Example 1

[0151] The same experiment as in Example 1 was carried out, except that the pharmaceutical composition was 3% PESA (polyepoxysuccinic acid); 4% EDTMPS (ethylenediaminetetra(methylene phosphonic acid) sodium salt); 10% HEDP (1-hydroxyethylidene-1,1-diphosphonic acid); 0.25% DDBAC (dodecyldimethylammonium chloride), and the rest was water.

[0152] Comparative Example 2

[0153] The same experiment as in Example 1 was carried out, except that the pharmaceutical composition was 1.0% ATMP.Na5; 1.5% HEDP.Na5; 3% NTA (nitrilotriacetic acid); 5% 25% concentration ammonia water; the rest was water;

[0154] Comparative Example 3

[0155] The same experiment as in Example 1 was carried out, except that the pharmaceutical composition was 81.0% EDTMPS.Na; 1.5% HEDP.Na5; 3% PESA.

[0156] Comparing the results in Example 1 with those in Comparative Examples 1-3, the results are shown in Tables 1 to 8. Among them, Table 1 is the detection result of the liquid in the kettle in Example 1, and Table 2 is the detection result of the scale dissolution rate in Example 1; Table 3 is the detection result of the liquid in the kettle in Comparative Example 1, and Table 4 is the detection result of the scale dissolution rate in Comparative Example 1; Table 5 is the detection result of the liquid in the kettle in Comparative Example 2, and Table 6 is the detection result of the scale dissolution rate in Comparative Example 2; Table 7 is the detection result of the liquid in the kettle in Comparative Example 3, and Table 8 is the detection result of the scale dissolution rate in Comparative Example 3.

[0157] Table 1

[0158]

[0159] Table 2

[0160]

[0161] Table III

[0162]

[0163] Table IV

[0164]

[0165] Table V

[0166]

[0167] Table VI

[0168]

[0169] Table VII

[0170]

[0171] Table VIII

[0172]

[0173] As can be seen from Table I to Table VIII, for the medicament in Example 1, in an environment of >200°C and 2.5 Mpa, the dissolution efficiency of its dirt is the highest, and the time-varying graphs of the pH and conductivity σ of the medicament in Example 1 are smooth without inflection points, and the operation fluctuations are within a narrow range, indicating that the medicament in Example 1 has stronger stability.

[0174] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", etc. is the orientation or positional relationship based on the working state of the present invention, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0175] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0176] The present invention has been described in conjunction with preferred embodiments, but these embodiments are merely exemplary and serve only an illustrative role. On this basis, various substitutions and improvements can be made to the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A high-temperature cleaning device for a helical tube steam generator of a lead-bismuth reactor, characterized in that, Including: A pure water tank for storing pure water; A reagent tank for storing reagents; A flushing pipeline for transporting reagents or pure water to the steam generator; A cooling and mist collection assembly for condensing and recovering the liquid passing through the steam generator; A recovery pipeline for transporting the condensed and recovered liquid to the circulating cleaning tank; A circulating cleaning tank connected to the pure water tank, the reagent tank, the flushing pipeline, and the recovery pipeline, and provided with a stirrer for mixing the recovered liquid and the reagent in the reagent tank.

2. The high-temperature cleaning device for the lead-bismuth reactor helical tube steam generator according to claim 1, characterized in that: The flushing pipeline is arranged in the reactor building, and the pipeline is made of heat-conducting material.

3. The high-temperature cleaning device for the lead-bismuth reactor helical tube steam generator according to claim 1, characterized in that: A pressure reducing valve is arranged on the flushing pipeline.

4. The high-temperature cleaning device for the lead-bismuth reactor helical tube steam generator according to claim 1, characterized in that: A thermometer is arranged on the flushing pipeline.

5. The high-temperature cleaning device for the lead-bismuth reactor helical tube steam generator according to claim 1, characterized in that: The cooling and mist collection assembly includes a condenser and a vapor-liquid collection tank, and the high-temperature gas-liquid passing through the steam generator is condensed by the condenser and collected in the vapor-liquid collection tank.

6. The high-temperature cleaning device for the lead-bismuth reactor helical tube steam generator according to claim 1, characterized in that: A flow sensor is arranged on the recovery pipeline.

7. The high-temperature cleaning device for the lead-bismuth reactor helical tube steam generator according to claim 1, characterized in that: A PH detector is arranged on the recovery pipeline.

8. The high-temperature cleaning device for the lead-bismuth reactor helical tube steam generator according to claim 1, characterized in that: A pressure gauge and a pressure supplement pipe are arranged on the circulating cleaning tank and / or the medicine supplement tank.

9. The high-temperature cleaning device for a lead-bismuth reactor helical tube steam generator according to claim 1, characterized in that, The cleaning reagent includes ATMP, HEDP, DT-102 and Lan826.

10. A high-temperature cleaning method for a lead-bismuth reactor helical tube steam generator, which is carried out by using the high-temperature cleaning device for the lead-bismuth reactor helical tube steam generator as described in any one of claims 1-8, and is characterized in that, Including the following steps: S1. Connect the cleaning device to the steam generator and flush the steam generator with pure water; S2. Flush the steam generator with the cleaning reagent; S4. Rinse the steam generator to complete the cleaning.

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