Flow Path Monitoring System

Abstract

To provide a flow path surveillance system capable of exactly and easily determining a deterioration state.SOLUTION: A flow path surveillance system includes a data output part for outputting deterioration data regarding a deterioration state of a flow path through which fluid flows. Multiple deterioration data are acquired along a time axis and the data output part lines up multiple deterioration data along the time axis and outputs them.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] SUMMARY OF THE DISCLOSURE An embodiment of the present invention relates to a flow path monitoring system. [Background technology]

[0002] Power plants are important infrastructure, and scheduled maintenance is carried out on them to avoid a sudden stop in operation due to an accident or the like, which could lead to an unstable power supply.

[0003] Among the components of a power plant, parts such as pipes that form the flow paths through which fluids flow may become corroded and damaged over time. For example, the pipes (water supply and drainage pipes, steam pipes, etc.) that form a heat recovery boiler may become damaged by corrosion, causing fluids (water, steam, etc.) to leak. As a result, the operation of the entire power plant may be stopped.

[0004] For this reason, in order to improve the reliability of power plants, the properties of the fluid (such as water quality) are managed during operation of the power plant. Also, during inspection of the power plant, the pipes that make up the flow paths are removed, for example by cutting, to check for abnormality occurrence. In addition, the pipes that make up the flow paths are monitored using sensors.

[0005] It has also been proposed to obtain deterioration data regarding the deterioration state of the flow path by collecting the fluid flowing through the flow path and analyzing the components (elements, ions, complexes) contained in the collected fluid. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2020-183801 A [Patent Document 2] JP 2014-202603 A [Patent Document 3] Japanese Patent Application Publication No. 8-262186 [Patent Document 4] JP 2005-331262 A [Patent Document 5] JP 2007-17186 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, the criteria for determining the deterioration state differ depending on the environment of the flow path, etc. For this reason, it may be difficult to accurately determine the deterioration state based only on the deterioration data value. In order to accurately determine the deterioration state, it is necessary to easily grasp the history of the acquired deterioration data changing over time.

[0008] Therefore, an object of the present invention is to provide a flow passage monitoring system capable of accurately and easily determining a deterioration state. [Means for solving the problem]

[0009] The flow path monitoring system of the embodiment is a flow path monitoring system for detecting a deterioration state of a flow path through which a fluid flows. Multiple Degradation data Arranged along the timeline a data output unit for outputting the data; The fluid contains solid matter that has peeled off from a formation formed on the inner surface of the flow path, and the flow path has a plurality of collection points for collecting the fluid containing solid matter as collected matter, spaced apart in the flow direction of the fluid, and the plurality of degradation data are data obtained by measuring and analyzing the collected matter collected at each of the plurality of collection points for collecting the collected matter. Effect of the Invention

[0010] According to the present invention, it is possible to provide a flow path monitoring system capable of accurately and easily determining a deterioration state. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating a flow path monitoring system 50 according to an embodiment. [Diagram 2] FIG. 2 is a diagram that illustrates a captured matter collection point 211 in the power generation system 10 according to the embodiment. [Diagram 3] FIG. 3 is a diagram showing a plurality of cross sections of the flow path 20 of the power generation system 10 according to the embodiment. [Figure 4A] FIG. 4A is a diagram illustrating a deteriorated state in the flow passage 20 of the power generation system 10 according to the embodiment. [Figure 4B] FIG. 4B is a diagram illustrating a deteriorated state in the flow passage 20 of the power generation system 10 according to the embodiment. [Figure 4C] FIG. 4C is a diagram illustrating a deteriorated state of the flow passage 20 of the power generation system 10 according to the embodiment. [Figure 4D] FIG. 4D is a diagram illustrating a deteriorated state of the flow passage 20 of the power generation system 10 according to the embodiment. [Diagram 5] FIG. 5 is a diagram showing an example of deterioration data acquired by the data acquisition unit 51 according to the deterioration state of the flow path 20 in the flow path monitoring system 50 according to the embodiment. [Figure 6] FIG. 6 is a diagram showing an example of an image output by the data output unit 52 in the flow path monitoring system 50 according to the embodiment. [Figure 7] FIG. 7 is a diagram showing an example of an image output by the data output unit 52 in the first modification of the embodiment. [Figure 8] FIG. 8 is a diagram illustrating a flow path monitoring system 50 according to a second modification of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] [A] Overall configuration FIG. 1 is a diagram illustrating a flow path monitoring system 50 according to an embodiment.

[0013] 1, the flow path monitoring system 50 has a data acquisition unit 51 and a data output unit 52, and is provided to monitor a flow path 20 configured of piping through which a fluid F flows in a power generation system 10. The flow path monitoring system 50 includes, for example, a calculator and a memory, and is configured to function as each unit by the calculator performing calculation processing using a program stored in the memory.

[0014] [A-1] Power generation system 10 Before describing the flow passage monitoring system 50, the power generation system 10 including the flow passage 20 that is the object of monitoring by the flow passage monitoring system 50 will be described.

[0015] 1, in a power generation system 10, a flow path 20 is configured so that a fluid F circulates between a main machine 11 such as a turbine and an auxiliary machine 12 such as a heater. In the power generation system 10, the flow path 20 is configured, for example, with piping. For example, when the power generation system 10 is a steam turbine power generation system, the flow path 20 is, for example, a piping that configures a boiler, a piping for supplying water to the boiler, a piping for supplying steam from the boiler to the steam turbine, and a piping through which steam discharged from the steam turbine flows. Alternatively, the flow path 20 may be a piping through which a cooling medium flows for cooling a generator that generates electricity by driving a turbine.

[0016] A plurality of collected matter collection points 211, 212, 221, and 222 are provided at intervals in the flow path 20. In each of the plurality of collected matter collection points 211, 212, 221, and 222, for example, a fluid F is collected as a collected matter.

[0017] Fig. 2 is a diagram illustrating a captured matter collection point 211 in the power generation system 10 according to the embodiment. Although Fig. 2 illustrates the captured matter collection point 211, the captured matter collection points 212, 221, and 222 other than the captured matter collection point 211 are also configured in the same manner.

[0018] 2, the collected matter collection point 211 is provided with a bypass flow path BP211 that bypasses the flow path 20 through which the fluid F flows. The bypass flow path BP211 is provided with a bypass valve V211 and a collected matter tank 211a. The collected matter tank 211a is installed downstream of the bypass valve V211 in the flow direction of the fluid F. When the collected matter is to be collected at the collected matter collection point 211, the bypass valve V211 is opened, so that the fluid F is collected as the collected matter in the collected matter tank 211a. On the other hand, when the collected matter is not to be collected, the bypass valve V211 is fully closed.

[0019] 3 is a diagram showing a plurality of cross sections of the flow path 20 of the power generation system 10 according to the embodiment. In FIG. 3, the first to fifth faces aligned in the flow direction of the fluid F are shown in order.

[0020] As shown in FIG. 3, formations 201, 202, and 203 are formed on the inner surface of the flow path 20, which is a pipe. Since the flow path 20 of the power generation system 10 has different environments (temperature, etc.) at each cross section, the formations 201, 202, and 203 made of different materials may be formed at each cross section. The formations 201, 202, and 203 are, for example, oxide films. Specifically, when the constituent material of the flow path 20 contains iron, the formations 201, 202, and 203 are formed by iron hydroxide, magnetite, crude rust, hematite, dense rust, and the like. For example, on the first surface, the formation 201 is iron hydroxide. On the second surface, the formation 202 is magnetite or crude rust. On the third and fourth surfaces, the formation 202 is a laminate of magnetite or crude rust, which is the formation 202, and hematite or dense rust, which is the formation 203. On the fifth surface, the formation 203 is hematite or dense rust. When the constituent material of the flow path 20 contains copper, the formations 201, 202, and 203 are formed of copper hydroxide, copper oxide, copper chloride, copper sulfide, etc. The formations 201, 202, and 203 also contain scale deposited due to silicon, calcium, and the like contained in the water.

[0021] As described above, at each of the plurality of collected matter collection points 211, 212, 221, 222, the fluid F containing solids such as the peeled formations 201, 202, 203 may be collected as collected matter. The collected matter contains, as solids, the peeled formations 201, 202, 203 as well as pieces of the constituent material of the flow path 20 scraped off. For this reason, the collected matter tank 211a may include a filter (not shown) to separate the solids from the liquid components. In addition to the filter, the collected matter tank 211a may include an ion exchange resin, an adsorbent, or the like.

[0022] [A-2] Flow path monitoring system 50 Next, each component of the flow path monitoring system 50 will be described in order.

[0023] [A-2-1] Data Acquisition Unit 51 In the flow path monitoring system 50, the data acquisition unit 51 is provided to acquire deterioration data relating to the deterioration state of the flow path 20 through which the fluid F flows in the power generation system 10. The data acquisition unit 51 acquires multiple pieces of deterioration data along a time axis, and stores the acquired deterioration data.

[0024] The data acquisition unit 51 acquires deterioration data by measuring and analyzing the collected matter collected at each of the plurality of collected matter collection points 211, 212, 221, and 222. Here, the deterioration data acquired includes detection data obtained by a sensor (not shown) detecting the characteristics of the collected matter collected at each of the plurality of collected matter collection points 211, 212, 221, and 222, and various data obtained by processing the detection data.

[0025] For example, when fluid F containing solids such as the above-mentioned formations 201, 202, and 203 is collected as the collected material, the data acquiring unit 51 acquires deterioration data by measuring values ​​such as turbidity, electrical conductivity, pH, and dissolved oxygen concentration. The data acquiring unit 51 may also acquire deterioration data by performing a pretreatment (acid treatment, alkali treatment, etc.) on the collected material and then analyzing the total iron concentration and other contained elements of the pretreated collected material.

[0026] In addition, the degradation data may be obtained by performing various analyses on the solid matter after separating the solid matter contained in the collected matter. For example, the apparatus may be configured to perform energy dispersive X-ray analysis (SEM-EDX, SEM-EDS, TEM-EDS, FE-TEM), electron probe microanalyzer (EPMA), or emission spectrometry. For example, the oxidation state of the solid matter (i.e., information on the oxide film) can be obtained as degradation data by analyzing the ratio of the valence of metal elements to oxygen. If the solid matter is a component other than the component (e.g., iron) that constitutes the flow path 20, it is possible to grasp the situation in which foreign matter has been mixed in. Various analyses such as ion components may be performed on the liquid from which the solid matter contained in the collected matter has been separated.

[0027] The data acquisition unit 51 can be configured appropriately depending on the object of measurement or analysis.

[0028] 4A to 4D are diagrams illustrating a deterioration state of the flow path 20 of the power generation system 10 according to the embodiment. Fig. 5 is a diagram illustrating an example of deterioration data acquired by a data acquisition unit 51 according to the deterioration state of the flow path 20 in a flow path monitoring system 50 according to the embodiment.

[0029] FIG. 4A shows the state in the case of [Case 1] where a protective film 221 is formed on the inner surface of the pipe H20 constituting the flow path 20, and since the oxidation reaction and the reduction reaction are in equilibrium in the flow path 20, the elution of ions and the peeling of the film do not proceed. FIG. 4B shows the state in the case of [Case 2] where the entire inner surface of the pipe H20 constituting the flow path 20 is corroded and covered with a corrosion film 222 which is an oxide film, and when the fluid F is fast, the corrosion film 222 may peel off slightly and ions may also be eluted. FIG. 4C shows the state in the case of [Case 3] where "flow-accelerated corrosion" (FAC) occurs locally in the pipe H20 constituting the flow path 20, and the elution of ions mainly proceeds. FIG. 4A shows the case of [Case 4] where erosion and corrosion occur on the inner surface of the pipe H20 constituting the flow path 20, and the action of peeling off the corrosion film 222 is strong.

[0030] 5 shows an example of degradation data acquired by the data acquisition unit 51 in each of [Case 1] to [Case 4]. In each of [Case 1] to [Case 4], the flow path 20 is in the above-mentioned state, so that various degradation data are acquired as shown in FIG.

[0031] [A-2-2] Data output unit 52 In the flow path monitoring system 50, the data output unit 52 is provided to output the degradation data acquired by the data acquisition unit 51. Here, the data output unit 52 outputs a plurality of degradation data acquired along the time axis by the data acquisition unit 51, arranged along the time axis.

[0032] The data output unit 52 includes, for example, a display (not shown) and is configured to output the degraded data by generating an image in which multiple degraded data are arranged along a time axis and displaying the image on the display screen.

[0033] FIG. 6 is a diagram showing an example of an image output by the data output unit 52 in the flow path monitoring system 50 according to the embodiment.

[0034] 6, the horizontal axis is time t, and the vertical axis is thickness D of the piping that constitutes flow path 20. On the horizontal axis "time t", "time t0" is the time of initial inspection (before operation begins), "time t1" is the time of the first inspection, "time t2" is the time of the second inspection, and "time t3" is the time of the third inspection. On the vertical axis "piping thickness D", thickness D0 is the initial thickness, thickness D1 is the thickness at which replacement is recommended at the next inspection (next recommended replacement thickness), thickness D2 is the thickness at which replacement is recommended (recommended replacement thickness), and thickness D3 is the limit thickness that the piping can withstand pressure (pressure-resistance limit thickness).

[0035] 6, the data output unit 52 displays on the screen an image of a graph in which thicknesses D of the piping constituting the flow path 20 are arranged along a time axis as deterioration data. The thicknesses D of the piping are deterioration data acquired by the data acquisition unit 51 calculating them from the results of measurements or the like made on the fluid F flowing through the flow path 20, and are acquired not only at the time of each inspection (t0, t1, t2, t3) but also during the period when the power generation system 10 is operating, and are output by the data output unit 52.

[0036] 6, even if the pipe thickness D reaches the next recommended replacement thickness D2 at a time tx before the third inspection (t3) contrary to prediction after the pipe thickness D reaches the next recommended replacement thickness D1 at the second inspection (t2), the deterioration state can be easily grasped. As a result, it is possible to prevent the pipe thickness D from becoming thinner than the pressure-resistant limit thickness D3 and the fluid F from leaking.

[0037] The data output unit 52 outputs, for example, the deterioration data acquired by the data acquisition unit 51 for each of the plurality of sample collection points 211, 212, 221, and 222, arranged along a time axis. This makes it possible to easily grasp the deterioration state at each position of the flow path 20.

[0038] In addition, the data output unit 52 may be configured to include, for example, a printer in addition to a display (not shown), and to output the degraded data by printing on paper an image in which multiple degraded data are arranged along a time axis.

[0039] [A-3] Other The operation of each part constituting the flow path monitoring system 501 is controlled by a control device (not shown). The control device controls the operation of each part constituting the flow path monitoring system 50, for example, by a calculator performing arithmetic processing using a program stored in a memory device. Here, the control device receives operation commands input by an operator as input signals. Then, the control device outputs control signals to each part constituting the flow path monitoring system 50 based on the input signals such as the input operation commands. As a result, each part of the flow path monitoring system 50 performs the above-mentioned operations.

[0040] [B] Summary As described above, in the flow path monitoring system 50 of the present embodiment, the data output unit 52 outputs, along a time axis, degradation data relating to the degradation state of the flow path 20 through which the fluid F flows in the power generation system 10. Therefore, in the present embodiment, it is possible to easily determine the degradation state of the flow path 20 and to appropriately perform operational management such as repair of the flow path 20, thereby making it possible to prevent leakage of the fluid F from the flow path 20.

[0041] [C] Variation A modification of the above embodiment will now be described.

[0042] [C-1] Variation 1 In the first modification, when controlling the properties of the fluid F, the data acquisition unit 51 acquires multiple pieces of degradation data along the time axis. Specifically, when controlling the properties of the fluid F by performing a process of adding a chemical (rust inhibitor, pH adjuster, cleaning agent, etc.) to the fluid F, the degradation data is acquired along the time axis. Then, the data output unit 52 outputs the multiple pieces of degradation data acquired along the time axis by the data acquisition unit 51 in an arranged manner along the time axis.

[0043] FIG. 7 is a diagram showing an example of an image output by the data output unit 52 in the first modification of the embodiment.

[0044] In Fig. 7, the horizontal axis indicates time t (operating time), and the vertical axis indicates the wall thinning rate V at which the thickness of the piping constituting flow path 20 is reduced. In Fig. 7, "OT" indicates the case where oxygen treatment was performed, "AVT" indicates the case where pH water treatment was performed, and "during trouble" indicates the case where a trouble due to flow accelerated corrosion (FAC) occurred. On the vertical axis, "wall thinning rate V," the dashed lines labeled "hematite," "magnetite," "Fe-OOH," and "FAC(Fe)" each indicate the detection ratio.

[0045] As shown in Fig. 7, the data output unit 52 displays on the screen, for example, an image of a graph in which the wall-thinning rate V of the pipe constituting the flow path 20 is arranged along a time axis as deterioration data. The wall-thinning rate V is deterioration data acquired by the data acquisition unit 51 calculating it from the results of measurements or the like made on the fluid F flowing through the flow path 20. As shown in Fig. 7, by the data output unit 52 displaying an image, it is possible to easily grasp the change in the deterioration state when the properties of the fluid F are controlled.

[0046] [C-2] Variation 2 FIG. 8 is a diagram illustrating a flow path monitoring system 50 according to a second modification of the embodiment.

[0047] 8, in the second modification, the flow path monitoring system 50 further includes a determination unit 53. The determination unit 53 is configured to make a determination regarding the deterioration state of the flow path 20 based on the deterioration data acquired by the data acquisition unit 51.

[0048] The determination unit 53 receives degradation data, such as solid concentration, total iron concentration, material of solids, iron ion concentration, and electrical conductivity, from the data acquisition unit 51, and determines the degradation state of the flow path 20 based on the combination of the degradation data.

[0049] For example, when the concentration of solids exceeds the threshold, the total iron concentration exceeds the threshold, the material of the solids is Fe3O4, and the iron ion concentration exceeds the threshold, the determination unit 53 determines that flow accelerated corrosion, erosion, or corrosion is occurring. When the concentration of solids exceeds the threshold, the total iron concentration exceeds the threshold but the material of the solids is hydroxide, the determination unit 53 determines that flow accelerated corrosion is occurring. When the concentration of solids exceeds the threshold but the total iron concentration is equal to or less than the threshold, the determination unit 53 determines that non-ferrous oxides are generated or Fe ions are locally present. 2+ It is determined that ions are eluted.

[0050] Also, for example, when the concentration of solids is equal to or less than the threshold, the electrical conductivity exceeds the threshold, and the iron ion concentration exceeds the threshold, the determination unit 53 determines that flow accelerated corrosion has occurred. When the concentration of solids is equal to or less than the threshold, the electrical conductivity exceeds the threshold but the iron ion concentration is equal to or less than the threshold, the determination unit 53 determines that contamination with a corrosive component has occurred. When the concentration of solids is equal to or less than the threshold, and the electrical conductivity is equal to or less than the threshold, the determination unit 53 determines that a protective film has been formed and that the state is stable.

[0051] [C-3] Other In the above embodiment, the case where the data acquisition unit 51 and the data output unit 52 are connected online has been described, but this is not limited thereto. The data acquisition unit 51 and the data output unit 52 may be connected in an offline state. Similarly, the data acquisition unit 51 and the determination unit 53 may be connected in either an online or offline state.

[0052] <Other> Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0053] 10: power generation system, 11: main engine, 12: auxiliary engine, 20: flow path, 50: flow path monitoring system, 51: data acquisition unit, 52: data output unit, 53: judgment unit, 201: formation, 202: formation, 203: formation, 211, 212, 221, 222: collected material collection point, 211a: collected material tank, 221: protective film, 222: corrosion film, 501: flow path monitoring system, BP211: bypass flow path, F: fluid, H20: piping, V211: bypass valve

Claims

1. A data output section that outputs a plurality of deterioration data related to the deterioration state of a flow path through which a fluid flows, arranged along a time axis. having the fluid includes solid matter that is peeled off from a formation formed on an inner surface of the flow channel, The flow path includes a plurality of collected matter collection points that collect the fluid containing the solid content as collected matter, the collected matter collection points being spaced apart from each other in a flow direction of the fluid, The plurality of degradation data are data obtained by performing measurements and analyses on the collected matter collected at each of the plurality of collected matter collection points. Flow path monitoring system.

2. A data acquisition unit that acquires a plurality of pieces of the degradation data along a time axis. having The data output unit outputs the degradation data acquired by the data acquisition unit. The flow path monitoring system of claim 1 .

3. The data acquisition unit acquires a plurality of pieces of the deterioration data along a time axis when controlling the property of the fluid. The flow path monitoring system of claim 2 .

4. The data acquisition unit acquires the deterioration data by analyzing components contained in the fluid. The flow path monitoring system according to claim 2 or 3.

5. The flow path includes piping that constitutes a power generation plant. A flow path monitoring system according to any one of claims 1 to 4.

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