Centralized sampling device and method for water vapor of power plant

Abstract

The invention discloses a power plant water vapor centralized sampling device and method. The power plant water vapor centralized sampling device comprises a high-temperature and high-pressure sampling valve, a filter, a cooler, a cooler water inlet regulating valve, a cooler water return valve, a pressure reducing valve, a safety valve, an electromagnetic valve and a temperature controller. By means of the arrangement, in actual operation, the problems that a filter of a water vapor centralized sampling device is frequently blocked and cannot be thoroughly washed, and steam is easily discharged during sampling pollution discharge can be solved through the water vapor centralized sampling device. The opening degree of the cooling water inlet regulating valve of the cooler can be automatically regulated according to the temperature of the cooled sample water, so that the flow of the cooling water is reduced, the cooling water is saved, and the water vapor centralized sampling device is more economical and safer to use. Not only is the workload of workers reduced, but also the workers do not need to worry about steam discharge and scald accidents during pollution discharge. Compared with a traditional steam-water centralized sampling system, the safety and the convenience are greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of centralized water vapor sampling in industrial production, and in particular relates to a centralized water vapor sampling device and method for a power plant. Background Art

[0002] If the water vapor quality of the thermal system of a power plant is poor, it will cause scaling, salt accumulation and metal corrosion in the water vapor system; these problems will seriously affect the normal operation of the equipment and even cause equipment damage. For example, scaling of thermal equipment will reduce heat transfer efficiency, corrosion will lead to a decline in equipment performance, and salt accumulation will affect the normal operation of the steam turbine.

[0003] Most of the corrosion products of thermal systems come from water and steam systems. Corrosion products that are not completely removed before the boiler is started or that are gradually generated during the startup process form deposits at places with large heat loads or slow water circulation, and absorb other particles, which not only weakens the heat transfer, but also promotes corrosion. Although the water entering the boiler is deoxygenated and the pH value of the boiler water is often relatively high, corrosion still occurs. If the corrosion is severe, it is easy to cause pipe bursts due to the high temperature and high pressure in the boiler.

[0004] Through the sampling of the water vapor centralized sampling device and the online instrument analysis data, impurities and harmful substances in the water vapor can be discovered and treated in time, the water vapor quality can be improved, the corrosion, scaling and salt accumulation of thermal equipment can be effectively prevented, the safety of thermal equipment operation can be improved, the service life of the equipment can be extended, and the operating efficiency of the unit can be improved. This is especially important for large-capacity and high-parameter units, which can significantly reduce energy consumption and improve economic benefits.

[0005] The existing centralized water vapor sampling device mainly reduces the sample water temperature through a cooler, and after the pressure reducing valve reduces the sample water pressure, the decompressed and cooled sample water is sent to the online analyzer. The online instrument sends the analysis results to the control system to guide the staff to find problems with the water vapor quality and make corresponding adjustments in time. The staff in this field found that in actual operation, the sampling valve and filter are often blocked, especially in newly built or overhauled power plants. There are many particulate impurities in the thermal system. When the blockage is serious, it is impossible to sample normally, and it is difficult to clean, resulting in the inability to measure the centralized water sampling and analysis normally. If the water sample is to be measured normally, the staff needs to frequently flush the sewage pipe. The flushing and sewage process is often accompanied by the overflow of high-temperature and high-pressure steam, which increases the workload of the staff and is accompanied by scalding. Insufficient sewage discharge affects normal sampling. Summary of the invention

[0006] In view of the above-mentioned problems and risks existing in the prior art, the main purpose of the present invention is to provide a centralized water vapor sampling device and method for a power plant, which can reduce the workload of the staff, prevent scalding accidents, and fully carry out flushing and sewage discharge. At the same time, the cooling water volume is automatically adjusted according to the water sample temperature, thereby saving cooling water consumption.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: The present invention provides a centralized water vapor sampling device for a power plant, comprising: a high-temperature and high-pressure sampling primary valve, a filter, a cooler, a solenoid valve, a thermal resistor and a temperature controller; One end of the high-temperature and high-pressure sampling primary valve is used to connect to the thermal system of the power plant, and the other end is connected to the inlet of the filter. The first outlet of the filter is connected to the inlet of the cooler through the high-temperature and high-pressure sampling secondary valve. The first outlet of the cooler is connected to the conventional constant temperature system and online instruments through a pressure reducing valve, a solenoid valve and a thermal resistor. The cooling water inlet regulating valve and the solenoid valve of the cooler are communicated with the temperature controller, and the temperature controller is connected to the thermal resistor line.

[0008] A further improvement of the present invention is that it also includes a waste water cooler, and the second outlet of the filter is connected to the inlet of the waste water cooler through a high-temperature and high-pressure waste water valve.

[0009] A further improvement of the present invention is that a water inlet valve and a water return valve are also connected to the sewage cooler.

[0010] A further improvement of the present invention is that a bypass is provided between the filter and the cooler, and a backwash water inlet valve is provided on the bypass.

[0011] A further improvement of the present invention is that a cooling water return valve is also connected to the cooler.

[0012] A further improvement of the present invention is that a safety valve is provided between the pressure reducing valve and the solenoid valve.

[0013] The present invention also provides a method for centralized water vapor sampling in a power plant. The method is based on the centralized water vapor sampling device in a power plant, and comprises: The high-temperature and high-pressure steam or water of the thermal system of the power plant flows through the high-temperature and high-pressure sampling tube to the high-temperature and high-pressure sampling primary valve. After the high-temperature and high-pressure sampling primary valve is opened, the steam or water enters the filter, and the filter filters and removes solid particle impurities in the water sample; After the steam or water is discharged from the thermal system, the high-temperature and high-pressure sampling secondary valve is opened, and the steam or water is cooled down through the cooler; the cooling water inlet regulating valve automatically adjusts the opening of the cooling water inlet regulating valve according to the measurement data of the temperature controller to maintain the sample water temperature down to the system requirements; The steam or water is cooled down by the cooler, and the sample water pressure is reduced by the pressure reducing valve before being sent to manual sampling or online analyzer. After being measured by the constant temperature device and online instrumentation, the water samples of the thermal system of the power plant are analyzed online in a centralized manner to guide the staff to promptly detect abnormal steam or water quality and take appropriate measures.

[0014] A further improvement of the present invention is that it also includes: When the filter intercepts a lot of impurities, the trapped impurities in the filter are flushed out by opening the high-temperature and high-pressure valve drain valve. At this time, the filter is positively flushed, which can flush out most of the impurities.

[0015] A further improvement of the present invention is that it also includes: When the filter cannot completely remove impurities by forward flushing, the impurities are completely removed by backwashing, that is, clean water with a set pressure is applied to the water outlet side of the filter; at this time, the high-temperature and high-pressure sampling primary valve is closed, and the high-temperature and high-pressure drain valve and the backwashing water inlet valve are opened. The water coming from the backwashing water inlet valve selects the closed cooling water of the sampling device, and the filter is thoroughly flushed by backwashing to ensure the normal operation of the filter.

[0016] A further improvement of the present invention is that it also includes: When the high-temperature and high-pressure sample water is flushed through the high-temperature and high-pressure drain valve, the high-temperature and high-pressure steam or water is discharged through the drain cooler, where the high-temperature and high-pressure steam or water is cooled and depressurized by cooling water and discharged into the drain ditch; the inlet valve and return valve of the drain cooler are opened to cool the drain steam or water when the high-temperature and high-pressure sample water is discharged; when the steam or water is sampled normally and no discharge is performed, the inlet valve and return valve are closed; After the steam or water in the thermal system is discharged, the high-temperature and high-pressure drain valve is closed and the cooler cooling water return valve is kept open.

[0017] Compared with the prior art, the present invention has at least the following beneficial technical effects: The present invention provides a centralized water vapor sampling device and method for a power plant. Impurities in high-temperature and high-pressure steam or water in the thermal system of the power plant are intercepted and removed by a filter. When the filter intercepts a large number of impurities, the present invention combines forward flushing and backwashing of the filter to thoroughly flush the impurities in the filter. This solves the problem that there are many particulate impurities in the thermal system of the power plant, the filter is seriously clogged and cannot be sampled normally, and it is difficult to clean the filter.

[0018] The sewage discharge system of the present invention is provided with a cooler. When high-temperature and high-pressure steam or water is discharged through the sewage cooler, the high-temperature and high-pressure steam or water is cooled and depressurized by cooling water in the sewage cooler and discharged into the drainage ditch. This prevents high-temperature and high-pressure steam or water from being directly discharged into the ditch and vaporizing, which affects the safety of on-site workers. The water inlet valve and the water return valve of the sewage cooler are opened when the high-temperature and high-pressure sample water is discharged; when the steam or water is sampled normally and sewage is not discharged, the water inlet valve and the water return valve are closed to save cooling water.

[0019] A regulating valve is set at the cooling water inlet of the sample water cooler of the thermal system. The cooling water return valve of the sample water cooler is always open. The cooling water inlet regulating valve automatically adjusts the opening of the cooling water inlet regulating valve according to the sample water temperature detected by the temperature controller to ensure that the water sample is cooled to the required temperature and save cooling water. The cooling water inlet valve is set as a regulating valve, which can automatically control the opening of the regulating valve according to the sample water temperature to ensure the cooling effect; it can also avoid large cooling water consumption and waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 The present invention is a schematic structural diagram of a centralized water vapor sampling device for a power plant.

[0022] Description of reference numerals: 1. High-temperature and high-pressure sampling primary valve; 2. Filter; 3. High-temperature and high-pressure drain valve; 4. Cooling water return valve; 5. Cooling water inlet valve; 6. Sample water drain cooler; 7. Backwash inlet valve; 8. High-temperature and high-pressure sampling secondary valve; 9. Cooling water return valve; 10. Cooling water inlet regulating valve; 11. Sample water cooler; 12. Pressure reducing valve; 13. Safety valve; 14. Solenoid valve; 15. Thermal resistor; 16. Temperature controller. DETAILED DESCRIPTION

[0023] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0029] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0030] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0031] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] Example 1 like Figure 1 As shown, the present invention provides a centralized water vapor sampling method for a power plant, comprising: a high-temperature and high-pressure sampling primary valve 1, a filter 2, a cooler 11, a solenoid valve 14, a thermal resistor 15 and a temperature controller 16; one end of the high-temperature and high-pressure sampling primary valve 1 is used to connect to the thermal system of the power plant, and the other end is connected to the inlet of the filter 2, the first outlet of the filter 2 is connected to the inlet of the cooler 11 through the high-temperature and high-pressure sampling secondary valve 8, the first outlet of the cooler 11 is connected to a conventional constant temperature system and online instruments through a pressure reducing valve 12, a solenoid valve 14 and a thermal resistor 15, the cooling water inlet regulating valve 10 and the solenoid valve 14 of the cooler 11 are communicatively connected to the temperature controller 16, and the temperature controller 16 is connected to the thermal resistor 15 line.

[0033] In this embodiment, a waste water cooler 6 is further included, and the second outlet of the filter 2 is connected to the inlet of the waste water cooler 6 through the high-temperature and high-pressure waste water valve 3 .

[0034] In this embodiment, the sewage cooler 6 is also connected to a water inlet valve 5 and a water return valve 4 .

[0035] In this embodiment, a bypass is also provided between the filter 2 and the cooler 11, and a backwash inlet valve 7 is provided on the bypass. The main function of the backwash inlet valve 7 is to control the flow direction of the water flow and realize the backwash operation. Specifically, it can guide the water flow to pass through the filter 2 in the reverse direction when necessary to wash away the dirt and impurities on the filter 2. After the filter 2 has been running for a period of time, a certain amount of dirt and impurities will accumulate on its surface, resulting in a decrease in filtration efficiency. By opening the backwash inlet valve 7, a reverse water flow can be introduced to effectively wash away the dirt and impurities on the surface of the filter 2 and restore its filtration performance. The backwash operation can regularly clean the filter 2 and keep its filtration channel unobstructed, thereby improving the filtration efficiency. This helps to ensure that the water quality received by the cooler 11 is always maintained at a high level, avoiding a decrease in cooling efficiency or equipment damage caused by water quality problems. By regularly backwashing, the accumulation of dirt and impurities inside the filter 2 can be reduced, and its operating load and wear degree can be reduced.

[0036] In this embodiment, the cooler 11 is also connected to a cooling water return valve 9 .

[0037] In this embodiment, a safety valve 13 is further provided between the pressure reducing valve 12 and the solenoid valve 14 .

[0038] Example 2 like Figure 1 As shown, the present invention provides a centralized water vapor sampling method for a power plant, comprising: The high-temperature and high-pressure steam or water in the thermal system of the power plant flows through the high-temperature and high-pressure sampling tube to the high-temperature and high-pressure sampling primary valve 1. After the high-temperature and high-pressure sampling primary valve 1 is opened, the steam or water enters the filter 2. The filter 2 filters and removes solid particle impurities in the water sample. Especially for newly built power plants or power plants started after maintenance, there are many particle impurities in the thermal system, and the filter 2 needs to be frequently drained and flushed in the early stage. When the filter 2 intercepts a lot of impurities, the impurities trapped in the filter 2 are flushed away by opening the high-temperature and high-pressure drain valve 3. At this time, the filter 2 is positively flushed. Positive flushing can flush away most of the impurities, but it cannot completely remove the impurities.

[0039] In this embodiment, when the filter 2 cannot completely remove impurities by forward flushing, the impurities can be completely removed by backwashing, that is, clean water with a set pressure is applied to the water outlet side of the filter 2. At this time, the high-temperature and high-pressure sampling primary valve 1 is closed, and the high-temperature and high-pressure drain valve 3 and the backwashing water inlet valve 7 are opened. The water coming from the backwashing water inlet valve 7 can be the closed cooling water of the sampling device, and the filter 2 can be thoroughly flushed by backwashing to ensure the normal operation of the filter 2.

[0040] In this embodiment, when the high-temperature and high-pressure sample water is flushed through the high-temperature and high-pressure drain valve 3, the high-temperature and high-pressure steam or water is discharged through the drain cooler 6, and the high-temperature and high-pressure steam or water in the drain cooler 6 is cooled and depressurized by cooling water and discharged into the drain ditch. Prevent high-temperature and high-pressure steam or water from being directly discharged into the ditch and vaporizing, which affects the safety of on-site workers. The cooling water inlet valve 5 and the return valve 4 of the drain cooler 6 are opened to cool the drain steam or water when the high-temperature and high-pressure sample water is discharged; when the steam or water is sampled normally and no discharge is performed, the cooling water inlet valve 5 and the return valve 4 are closed to save cooling water.

[0041] In this embodiment, after the steam or water of the thermal system is discharged, the high-temperature and high-pressure discharge valve 3 is closed, and the high-temperature and high-pressure sampling secondary valve 8 is opened, and the steam or water is cooled down through the cooler 11. The cooling water return valve 9 of the cooler 11 is always open, and the cooling water inlet regulating valve 10 automatically adjusts the opening of the cooling water inlet regulating valve 10 according to the measurement data of the temperature controller 16 to maintain the sample water temperature down to the required value. The opening of the cooling water inlet regulating valve 10 is flexibly adjusted, which saves the amount of cooling water compared with the current cooling method of fully opening the cooling water inlet valve.

[0042] In this embodiment, steam or water is cooled by the cooler 11, and the pressure reducing valve 12 reduces the pressure. When the pressure reducing valve 12 is improperly operated or fails, it is easy to cause overpressure leakage in the system. At this time, the safety valve 13 automatically trips to reduce the system pressure to the safe working pressure of the system to avoid overpressure leakage accidents. After the sample water is cooled and reduced in pressure, it is sent to manual sampling or online analyzer. After being measured by the constant temperature device and online instrument, the water samples of the thermal system of the power plant are analyzed online in a centralized manner to guide the staff to promptly discover abnormal steam or water quality and deal with it in time.

[0043] In this embodiment, when the cooling water system of the sampling device fails and cannot provide sufficient cooling water, the temperature of the sample water will gradually increase. The thermal resistor 15 measures the sample water temperature in real time and transmits the sample water temperature to the temperature controller 16. When the temperature controller 16 determines that the sample water temperature exceeds the set value, it automatically closes the solenoid valve 14 to cut off the over-temperature sample water from entering the subsequent device, thereby preventing damage to online instruments and scalding of sampling personnel.

[0044] In summary, the above-mentioned centralized water vapor sampling device and method for power plants can not only solve the problems of frequent clogging of the filter of the centralized water vapor sampling device and easy discharge of steam during sampling and sewage discharge, but also automatically adjust the cooling water flow to save cooling water, making the use of the centralized water vapor sampling device more economical and safe, not only reducing the workload of the staff, but also making the staff do not need to worry about the discharge of steam and scalding accidents when discharging sewage. Compared with the traditional centralized steam and water sampling system, it greatly improves safety and convenience.

[0045] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0046] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A centralized water vapor sampling device for a power plant, characterized in that: include: A high-temperature and high-pressure sampling primary valve (1), a filter (2), a cooler (11), a solenoid valve (14), a thermal resistor (15) and a temperature controller (16); One end of the high-temperature and high-pressure sampling primary valve (1) is used to connect to the thermal system of the power plant, and the other end is connected to the inlet of the filter (2). The first outlet of the filter (2) is connected to the inlet of the cooler (11) through the high-temperature and high-pressure sampling secondary valve (8). The first outlet of the cooler (11) is connected to a conventional constant temperature system and online instruments through a pressure reducing valve (12), a solenoid valve (14) and a thermal resistor (15). The cooling water inlet regulating valve (10) and the solenoid valve (14) of the cooler (11) are communicatively connected to a temperature controller (16), and the temperature controller (16) is connected to the thermal resistor (15) by wire.

2. A centralized water vapor sampling device for a power plant according to claim 1, characterized in that: It also includes a waste water cooler (6), and the second outlet of the filter (2) is connected to the inlet of the waste water cooler (6) through a high-temperature and high-pressure waste water valve (3).

3. A centralized water vapor sampling device for a power plant according to claim 2, characterized in that: The sewage cooler (6) is also connected to a water inlet valve (5) and a water return valve (4).

4. A centralized water vapor sampling device for a power plant according to claim 3, characterized in that: A bypass is also provided between the filter (2) and the cooler (11), and a backwash water inlet valve (7) is provided on the bypass.

5. A centralized water vapor sampling device for a power plant according to claim 4, characterized in that: The cooler (11) is also connected to a cooling water return valve (9).

6. A centralized water vapor sampling device for a power plant according to claim 4, characterized in that: A safety valve (13) is also provided between the pressure reducing valve (12) and the solenoid valve (14).

7. A centralized water vapor sampling method for a power plant, characterized in that: The method is based on a centralized water vapor sampling device for a power plant as described in claim 5, comprising: High-temperature and high-pressure steam or water in the thermal system of the power plant flows through the high-temperature and high-pressure sampling tube to the high-temperature and high-pressure sampling primary valve (1). After the high-temperature and high-pressure sampling primary valve (1) is opened, the steam or water enters the filter (2). The filter (2) filters and removes solid particle impurities in the water sample. After the steam or water in the thermal system is discharged, the high-temperature and high-pressure sampling secondary valve (8) is opened, and the steam or water is cooled down through the cooler (11); the cooling water inlet regulating valve (10) automatically adjusts the opening of the cooling water inlet regulating valve (10) according to the measurement data of the temperature controller (16) to maintain the sample water temperature down to the system requirement; The steam or water is cooled by the cooler (11), the sample water pressure is reduced by the pressure reducing valve (12), and then sent to the manual sampling or online analyzer. After being measured by the constant temperature device and online instrument, the water samples of the thermal system of the power plant are analyzed online in a centralized manner to guide the staff to promptly discover abnormal steam or water quality and take measures.

8. A centralized water vapor sampling method for a power plant according to claim 7, characterized in that: Also includes: When the filter (2) intercepts a large amount of impurities, the impurities trapped in the filter (2) are flushed away by opening the high-temperature and high-pressure valve drain valve (3). At this time, the filter (2) is positively flushed, and the positive flushing can flush away most of the impurities.

9. A centralized water vapor sampling method for a power plant according to claim 8, characterized in that: Also includes: When the filter (2) cannot completely remove impurities by forward flushing, the impurities are completely removed by backwashing, that is, clean water of a set pressure is applied to the outlet side of the filter (2); at this time, the high-temperature and high-pressure sampling primary valve (1) is closed, and the high-temperature and high-pressure drain valve (3) and the backwashing water inlet valve (7) are opened. The water from the backwashing water inlet valve (7) selects the closed cooling water of the sampling device, and the filter (2) is thoroughly flushed by backwashing to ensure the normal operation of the filter (2).

10. A centralized water vapor sampling method for a power plant according to claim 9, characterized in that: Also includes: When the high-temperature and high-pressure sample water is flushed through the high-temperature and high-pressure drain valve (3), the high-temperature and high-pressure steam or water is discharged through the drain cooler (6), and the high-temperature and high-pressure steam or water in the drain cooler (6) is cooled and depressurized by cooling water and discharged into the drain ditch; the inlet valve (5) and the return valve (4) of the drain cooler (6) are opened when the high-temperature and high-pressure sample water is discharged to cool the drain steam or water; when the steam or water is sampled normally and no discharge is performed, the inlet valve (5) and the return valve (4) are closed; After the steam or water in the thermal system is discharged, the high-temperature and high-pressure discharge valve (3) is closed, and the cooling water return valve (9) of the cooler (11) is normally opened.

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