Seawater leak alarm device

Abstract

To provide a seawater leakage alarm device capable of easily understanding stop timing of a steam turbine plant during leakage of seawater.SOLUTION: A seawater leakage alarm device according to at least one embodiment includes: an acid electrical conductivity meter that measures acid electrical conductivity of supply water in a water supply system of a steam turbine plant; an alarm signal output device configured to output an alarm signal on the basis of the acid electrical conductivity measured by the at least one acid electrical conductivity meter; and a prediction device configured to predict changes in seawater leakage to the supply water and output a prediction result on the basis of the acid electrical conductivity measured by the acid electrical conductivity meter.SELECTED DRAWING: Figure 1A

Description

[Technical Field]

[0001] The present disclosure relates to a seawater leakage alarm device for a steam turbine plant. [Background technology]

[0002] A steam turbine plant is known that includes a steam drum, a steam turbine configured to be driven by steam generated in the steam drum, and a condenser configured to cool the steam discharged from the steam turbine with seawater to produce feedwater. In such a steam turbine plant, the feedwater cooled and produced by the condenser is returned to the steam drum (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-074274 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, the seawater leak detection device described in Patent Document 1 is configured to calculate the chloride ion concentration of drum water based on the acid electrical conductivity measured by an acid electrical conductivity meter and determine whether a seawater SW leak has been detected. However, with the above-mentioned seawater leak detection device, it is not immediately clear when the steam turbine plant should be shut down to prevent damage to the steam turbine plant due to seawater leakage.

[0005] In consideration of the above circumstances, at least one embodiment of the present disclosure has an object to provide a seawater leakage alarm device that can easily determine when to shut down a steam turbine plant in the event of a seawater leak. [Means for solving the problem]

[0006] (1) A seawater leakage alarm device according to at least one embodiment of the present disclosure includes: A seawater leakage alarm device for a steam turbine plant including a steam drum, a steam turbine configured to be driven by steam generated by the steam drum, and a condenser configured to cool steam discharged from the steam turbine with seawater to generate feedwater, an acid electrical conductivity meter that measures the acid electrical conductivity of the feedwater in a feedwater system of the steam turbine plant; an alarm signal output device configured to output an alarm signal based on the acid conductivity measured by the at least one acid conductivity meter; a prediction device configured to predict a progression of seawater leakage into the feedwater based on the acid electrical conductivity measured by the acid electrical conductivity meter and output a prediction result; Equipped with. [Effects of the Invention]

[0007] According to at least one embodiment of the present disclosure, it is possible to easily determine when it is desirable to shut down a steam turbine plant in the event of a seawater leak. [Brief explanation of the drawings]

[0008] [Figure 1A] 1 is a schematic diagram showing a combined cycle plant to which a seawater leakage alarm device for a water supply system according to an embodiment of the present invention is applied. [Figure 1B] 1 is a schematic diagram showing a combined cycle plant to which a seawater leakage alarm device for a water supply system according to an embodiment of the present invention is applied. [Figure 2] FIG. 1 is a diagram illustrating a configuration of a sampling device according to an embodiment of the present invention. [Figure 3] 1 is a graph showing chloride ion concentration versus acid electrical conductivity. [Figure 4] FIG. 10 is a diagram showing an example of an image displaying the predicted results of the transition of chloride ion concentration in the feedwater. [Figure 5] 3 is a flowchart showing a processing procedure related to the seawater leakage alarm device of the present embodiment. [Figure 6A] FIG. 2 is a diagram illustrating an example of a display screen of an information processing device. [Figure 6B] FIG. 2 is a diagram illustrating an example of a display screen of an information processing device. [Figure 6C] FIG. 2 is a diagram illustrating an example of a display screen of an information processing device. [Figure 6D] FIG. 2 is a diagram illustrating an example of a display screen of an information processing device. [Figure 6E] FIG. 2 is a diagram illustrating an example of a display screen of an information processing device. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, several embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present disclosure. For example, expressions expressing relative or absolute arrangement such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" not only express such an arrangement exactly, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions such as "identical," "equal," and "homogeneous" that indicate that something is in an equal state not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. For example, expressions representing shapes such as a square shape or a cylindrical shape not only represent shapes such as a square shape or a cylindrical shape in the strict geometric sense, but also represent shapes including uneven portions, chamfered portions, etc., to the extent that the same effect can be obtained. On the other hand, the expressions "comprise," "include," "have," "includes," or "have" of one element are not exclusive expressions that exclude the presence of other elements.

[0010]

[0023] Preferred embodiments of a seawater leak alarm device for a water supply system according to the present disclosure will be described in detail below with reference to the accompanying drawings. Note that the present invention is not limited to these embodiments, and when there are multiple embodiments, the present invention also includes configurations that combine the embodiments. Note that the term "steam turbine plant" in this disclosure refers to a plant equipped with a steam turbine, and is, for example, a plant equipped with a power generation function, and may be a plant that generates power using a steam turbine alone, or a combined cycle plant that combines a steam turbine with other power generation means.

[0011] 1A and 1B are schematic configuration diagrams showing a combined cycle plant to which a seawater leakage alarm device in a water supply system according to this embodiment is applied. The combined cycle plant shown in Fig. 1A has one condenser 35, which will be described later, while the combined cycle plant shown in Fig. 1B has two condensers 35, which will be described later, arranged in parallel (a first condenser 35A and a second condenser 35B).

[0012] In this embodiment, as shown in FIGS. 1A and 1B, a combined cycle plant 10 includes a gas turbine 11, a heat recovery steam generator (HRSG) 12, a steam turbine 13, and a generator 14.

[0013] The gas turbine 11 has a compressor 21, a combustor 22, and a turbine 23, and the compressor 21 and the turbine 23 are connected by a rotor (rotating shaft) 24 so as to be able to rotate together. The compressor 21 compresses air A taken in through an air intake line L1 to generate compressed air AC. The combustor 22 mixes and burns the compressed air AC supplied from the compressor 21 through a compressed air supply line L2 with fuel gas F supplied from a fuel gas supply line L3. The turbine 23 is rotationally driven by combustion gas FG supplied from the combustor 22 through a combustion gas supply line L4.

[0014] The heat recovery steam generator 12 generates steam (superheated steam) S using the exhaust heat of the exhaust gas EG discharged from the gas turbine 11 (turbine 23) via an exhaust gas discharge line L5. The heat recovery steam generator 12 has a low-pressure unit 41, an intermediate-pressure unit 42, a high-pressure unit 43, and a reheater 44, which will be described later. The exhaust gas EG supplied from the gas turbine 11 travels upward inside the heat recovery steam generator 12, and thereby recovers heat from the exhaust gas EG in the order of the high-pressure unit 43, the intermediate-pressure unit 42, and the low-pressure unit 41, thereby generating the steam S. The heat recovery steam generator 12 is connected to a chimney 45 via an exhaust gas discharge line L6, which discharges the used exhaust gas EG used to generate the steam S.

[0015] The steam turbine 13 is driven by steam S generated by the heat recovery steam generator 12. The steam turbine 13 has a high-pressure turbine 31, an intermediate-pressure turbine 32, and a low-pressure turbine 33. The high-pressure turbine 31, the intermediate-pressure turbine 32, and the low-pressure turbine 33 are connected to a rotating shaft 34, which is connected to the rotor 24 of the gas turbine 11 in a straight line. The generator 14 is connected to the rotating shaft 34. The steam turbine 13 is provided with a condenser 35 that cools the steam that drives the low-pressure turbine 33. The condenser 35 cools the used steam S discharged from the low-pressure turbine 33 to produce condensate (feedwater W), and is provided with a cooling water line L7 that cools the steam with seawater SW. The condenser 35 supplies the generated condensate as feedwater W to the heat recovery steam generator 12 via a feedwater line L11. The water supply line L11 is provided with a condensate pump 36 and a condensate valve 37.

[0016] 1B, the condenser 35 includes a first condenser 35A and a second condenser 35B, which are two condensers 35 arranged in parallel. In the combined cycle plant 10 shown in FIG. 1B, the cooling water line L7 includes a first cooling water line L7A that cools the steam with seawater SW in the first condenser 35A, and a second cooling water line L7B that cools the steam with seawater SW in the second condenser 35B. The first condenser 35A supplies the generated condensate as feedwater W to the heat recovery steam generator 12 via a first feedwater line L11A. The first feedwater line L11A is provided with a first condensate pump 36A and a first condensate valve 37A. The feedwater W flowing through the first feedwater line L11A is also referred to as first feedwater WA. Similarly, the second condenser 35B supplies the generated condensate as feedwater W to the heat recovery steam generator 12 via a second feedwater line L11B. The second feedwater line L11B is provided with a second condensate pump 36B and a second condensate valve 37B. The feedwater W flowing through the second feedwater line L11B is also referred to as second feedwater WB. That is, in the combined cycle plant 10 shown in FIG. 1B, the condensate pump 36 includes a first condensate pump 36A and a second condensate pump 36B, and the condensate valve 37 includes a first condensate valve 37A and a second condensate valve 37B. The first feedwater line L11A and the second feedwater line L11B are both connected to one low-pressure economizer 51, which will be described later, and are configured to supply feedwater W to the low-pressure economizer 51, respectively.

[0017] In the combined cycle plant 10 shown in FIGS. 1A and 1B, a condensate circulation line L21 for returning feedwater W to the condenser 35 from the feedwater line L11 between the condensate pump 36 and the low-pressure economizer 51 is provided. In the combined cycle plant 10 shown in Figure 1B, the condensate circulation line L21 includes a first condensate circulation line L21A for returning the feedwater W from the first feedwater line L11A between the first condensate pump 36A and the low-pressure economizer 51 to the first condenser 35A, and a second condensate circulation line L21B for returning the feedwater W from the second feedwater line L11B between the second condensate pump 36B and the low-pressure economizer 51 to the second condenser 35B.

[0018] In the heat recovery boiler 12, the low-pressure unit 41 has a low-pressure economizer 51, a low-pressure drum 52, a low-pressure evaporator 53, and a low-pressure superheater 54. A low-pressure feedwater line L12 is provided in the feedwater line L11 downstream of the condensate pump 36 and the condensate valve 37, and feedwater W is sent to the low-pressure economizer 51 via this low-pressure feedwater line L12. The low-pressure economizer 51 heats the feedwater W, and the heated feedwater W is sent to the low-pressure drum 52. The low-pressure evaporator 53 heats the feedwater W in the low-pressure drum 52 (hereinafter, drum water W1) and returns it to the low-pressure drum 52. The low-pressure steam LS in the low-pressure drum 52 is sent to the low-pressure superheater 54, where it is superheated. In the combined cycle plant 10 shown in FIG. 1B, the first feedwater line L11A is provided with a first low-pressure feedwater line L12A downstream of the first condensate pump 36A and the first condensate valve 37A, and the feedwater W is sent to the low-pressure economizer 51 via this first low-pressure feedwater line L12A. In the combined cycle plant 10 shown in FIG. 1B, the second feedwater line L11B is provided with a second low-pressure feedwater line L12B downstream of the second condensate pump 36B and the second condensate valve 37B, and the feedwater W is sent to the low-pressure economizer 51 via this second low-pressure feedwater line L12B. That is, in the combined cycle plant 10 shown in FIG. 1B, the low-pressure feedwater line L12 includes the first low-pressure feedwater line L12A and the second low-pressure feedwater line L12B. In the combined cycle plant shown in FIG. 1B, the first low-pressure feedwater line L12A and the second low-pressure feedwater line L12B join together at the low-pressure economizer 51.

[0019] The medium-pressure unit 42 has a medium-pressure economizer 61, a medium-pressure drum 62, a medium-pressure evaporator 63, and a medium-pressure superheater 64. The low-pressure feedwater line L12 is provided with a medium-pressure feedwater line L13 that branches off downstream, and feedwater W is sent to the medium-pressure economizer 61 via this medium-pressure feedwater line L13. The medium-pressure feedwater line L13 is provided with a feedwater pump 65. The medium-pressure economizer 61 heats the feedwater W, and the heated feedwater W is sent to the medium-pressure drum 62. The medium-pressure evaporator 63 heats the feedwater W in the medium-pressure drum 62 (hereinafter, drum water W2) and returns it to the medium-pressure drum 62. The medium-pressure steam MS from the medium-pressure drum 62 is sent to the medium-pressure superheater 64, where it is superheated.

[0020] The high-pressure unit 43 has a high-pressure economizer 71, a high-pressure drum 72, a high-pressure evaporator 73, and a high-pressure superheater 74. A high-pressure feedwater line L14 branches off from the medium-pressure feedwater line L13 downstream of the feedwater pump 65, and feedwater W is sent to the high-pressure economizer 71 via this high-pressure feedwater line L14. The high-pressure economizer 71 heats the feedwater W, and the heated feedwater W is sent to the high-pressure drum 72. The high-pressure evaporator 73 heats the feedwater W in the high-pressure drum 72 (hereinafter, drum water W3) and returns it to the high-pressure drum 72. The high-pressure steam HS in the high-pressure drum 72 is sent to the high-pressure superheater 74, where it is superheated.

[0021] A high-pressure steam supply line L15 is provided to supply high-pressure steam HS from the high-pressure superheater 74 to the high-pressure turbine 31, and an intermediate-pressure steam recovery line L16 is provided to return intermediate-pressure steam MS used in the high-pressure turbine 31 and reduced in pressure to the reheater 44. The high-pressure steam supply line L15 is provided with a high-pressure main steam stop valve 75. An intermediate-pressure steam supply line L17 is provided to supply intermediate-pressure steam MS from the intermediate-pressure superheater 64 to the intermediate-pressure steam recovery line L16. An intermediate-pressure steam supply line L18 is provided to supply intermediate-pressure steam MS superheated in the reheater 44 to the intermediate-pressure turbine 32, and a low-pressure steam transfer line L19 is provided to transfer low-pressure steam LS used in the intermediate-pressure turbine 32 and reduced in pressure to the low-pressure turbine 33. The intermediate-pressure steam supply line L18 is provided with a reheat steam stop valve 66. A low-pressure steam supply line L20 is provided to supply low-pressure steam LS generated in the low-pressure superheater 54 to the low-pressure steam transfer line L19.

[0022] Therefore, during operation of the combined cycle plant 10, in the gas turbine 11, the compressor 21 compresses air, and the combustor 22 mixes and combusts the supplied compressed air AC with fuel gas F. The turbine 23 is rotationally driven by the combustion gas FG supplied from the combustor 22. Furthermore, exhaust gas EX discharged from the gas turbine 11 (turbine 23) is sent to the heat recovery steam generator 12, which generates steam S, and the steam S is sent to the steam turbine 13. The high-pressure turbine 31, the intermediate-pressure turbine 32, and the low-pressure turbine 33 are rotationally driven by this steam S. Then, the generator 14, which is arranged coaxially with the gas turbine 11 and the steam turbine 13, generates electricity. Meanwhile, the steam S used in the steam turbine 13 is cooled in the condenser 35 to become condensed water, which is returned to the heat recovery steam generator 12 as feedwater W.

[0023] The combined cycle plant 10 shown in FIGS. 1A and 1B includes an ammonia addition device 81. The ammonia addition device 81 adds an alkaline and volatile chemical, in this embodiment, ammonia, as a pH adjuster to the feedwater W between the condensate pump 36 and the condensate valve 37, upstream of the drums (steam drums) 52, 62, and 72 in the feedwater line L11. Note that the pH adjuster added by the pH adjuster addition device of the present disclosure is not limited to ammonia, and may be any amine containing at least one of ammonia, hydrazine, monoethanolamine, and morpholine. In the combined cycle plant 10 shown in FIG. 1B, the ammonia addition device 81 includes a first ammonia addition device 81A for adding a pH adjuster to the feedwater W between the first condensate pump 36A and the first condensate valve 37A, and a second ammonia addition device 81B for adding a pH adjuster to the feedwater W between the second condensate pump 36B and the second condensate valve 37B.

[0024] The combined cycle plant 10 shown in FIGS. 1A and 1B includes drainage devices 85, 86, and 87. The drainage devices 85, 86, 87 are composed of drainage lines 85a, 86a, 87a provided in each drum 52, 62, 72 of the low-pressure unit 41, the medium-pressure unit 42, and the high-pressure unit 43, and on-off valves 85b, 86b, 87b provided in each drainage line 85a, 86a, 87a. By opening the on-off valves 85b, 86b, 87b, the drum water W1, W2, W3 in each drum 52, 62, 72 can be discharged to the outside.

[0025] The water supply system 20 in the combined cycle plant 10 shown in Figures 1A and 1B includes a condenser 35, each drum 52, 62, 72, each water supply line L11, L12, L13, L14 from the condenser 35 to each drum 52, 62, 72, and each device provided on each water supply line L11, L12, L13, L14.

[0026] 1A and 1B, the feedwater W is sampled from various locations in the combined cycle plant 10 for water quality management of the feedwater W. In the combined cycle plant 10 shown in FIGS. 1A and 1B, the sampling locations for the feedwater W are, for example, a sampling point P1 at the outlet of the condensate pump 36, a sampling point P2 at the inlet of the low-pressure economizer 51, and a sampling point P3 of the drum water W3 in the high-pressure drum 72. Note that in the combined cycle plant 10 shown in FIG. 1B, the sampling point P1 at the outlet of the condensate pump 36 includes a sampling point P1A at the outlet of the first condensate pump 36A and a sampling point P1B at the outlet of the second condensate pump 36B, and the sampling point P2 at the inlet of the low-pressure economizer 51 includes a sampling point P2A at the inlet of the low-pressure economizer 51 on the first feedwater line L11A and a sampling point P2B at the inlet of the low-pressure economizer 51 on the second feedwater line L11B. Therefore, in the combined cycle plant 10 shown in Figure 1B, the acid electrical conductivity of the first feedwater WA sampled at sampling points P1A and P2A, and the acid electrical conductivity of the second feedwater WB sampled at sampling points P1B and P2B can be measured using the sampling device 90 described below.

[0027] The combined cycle plant 10 shown in FIGS. 1A and 1B is provided with a sampling device 90 for inspecting the quality of the feedwater W sampled from each of the sampling points P1, P2, and P3 described above. 2 is a diagram showing the configuration of a sampling device 90 in this embodiment. The sampling device 90 includes an electrical conductivity meter 91 for measuring the acid electrical conductivity of the sampled feedwater W, a pH meter 92 for measuring the pH value of the sampled feedwater W, a switching device 93 for switching the feedwater W to be measured, and a cation exchange resin tower 94. The cation exchange resin tower 94 is used to exchange sodium ions derived from seawater in the feed water W, whose acid electrical conductivity is being measured, for hydrogen ions. By measuring the acid electrical conductivity of the feed water W after the sodium ions derived from seawater have been exchanged for hydrogen ions, the chloride ion concentration in the feed water W can be determined as follows. Figure 3 is a graph showing chloride ion concentration versus acid electrical conductivity. As shown in Figure 3, it is known that chloride ion concentration is approximately directly proportional to acid electrical conductivity. Therefore, the chloride ion concentration in the feedwater W can be determined based on the correlation information between the acid electrical conductivity and the chloride ion concentration and the measured acid electrical conductivity. This correlation information is stored, for example, in memory 113 of the central control device 110, which will be described below.

[0028] The combined cycle plant 10 shown in FIGS. 1A and 1B includes a central control device 110, a measurement control device 120, and an information processing device . The central control device 110 is a control device for controlling the entire combined cycle plant 10, and is installed, for example, in a central operation room (not shown). The central control device 110 includes a processor 111 that executes various arithmetic processes, a memory 113 that non-temporarily or temporarily stores various data processed by the processor 111, and a display device 115 that displays various information. The processor 111 is realized by a CPU, a GPU, an MPU, a DSP, various other arithmetic devices, or a combination of these. The memory 113 is realized by a ROM, a RAM, a flash memory, or a combination of these.

[0029] The measurement control device 120 is a device for transmitting test results of the water quality of the water supply W and alarm signals based on the test results to the central control device 110. The measurement control device 120 includes a processor 121 that executes various arithmetic processing, and a memory 123 that non-temporarily or temporarily stores various data processed by the processor 121. The processor 121 is realized by a CPU, GPU, MPU, DSP, various other arithmetic devices, or a combination of these. The memory 123 is realized by a ROM, RAM, flash memory, or a combination of these. The transmission and reception of various information between the measurement control device 120 and the central control device 110 may be performed wirelessly or via a wire.

[0030] The information processing device 130 is a portable device that can take photographs and can be carried by a worker, and is used when the worker checks the combined cycle plant 10. In this embodiment, the information processing device 130 is used when the worker checks the sampling device 90, which will be described later. The information processing device 130 includes a processor 131 that executes various types of arithmetic processing, a memory 133 that non-temporarily or temporarily stores various types of data processed by the processor 131, an imaging unit 135 for taking photographs, a detection device 136 for detecting the current position, posture, orientation, etc. of the information processing device 130, a transmission / reception unit 137 for transmitting and receiving signals to and from the central control device 110, and a display unit 138 for displaying various types of information.

[0031] (Detection of seawater leakage) The condenser 35 cools the steam S with seawater SW to produce condensate (feedwater W), and therefore has many cooling water pipes arranged inside it that form the cooling water line L7. If these cooling water pipes are damaged for some reason, the seawater flowing through the cooling water pipes will mix with the condensate from the condenser 35. This may result in seawater components mixing into the feedwater system of the heat recovery steam generator 12, which could cause malfunctions such as heat transfer inhibition and corrosion. Therefore, it is necessary to detect seawater leakage in the condenser 35 and take measures to address the problem.

[0032] 1A and 1B is provided with a seawater leakage alarm device 1, which is configured to issue an alarm when the acid electrical conductivity measured for the feedwater W exceeds a preset value, as described below, and to predict the progression of seawater leakage into the feedwater W and present the prediction results when the alarm is issued. Furthermore, the combined cycle plant 10 shown in FIGS. 1A and 1B is configured to assist an operator when the operator checks the sampling device 90, as described below, when the alarm is issued. The seawater leakage alarm device 1 according to this embodiment includes an electrical conductivity meter 91 as an acid electrical conductivity meter, a measurement control device 120 as an alarm signal output device, and a central control device 110 as a prediction device. The seawater leakage alarm device 1 according to this embodiment will be described in detail below.

[0033] (Regarding alarm output) In the combined cycle plant 10 shown in Figures 1A and 1B, the measurement control device 120 controls the switching device 93 to sequentially switch between the feedwater W whose acid electrical conductivity and pH value are to be measured, and sequentially transmits the acid electrical conductivity and pH value of the feedwater W from each sampling point P1, P2, P3 where the acid electrical conductivity and pH value were measured to the central control device 110. Furthermore, when the measured acid electrical conductivity of any of the feedwaters W exceeds a preset value, the measurement control device 120 outputs an alarm signal and transmits it to the central control device 110. When the central control device 110 receives the alarm signal from the measurement control device 120, it causes the display device 115 to display on the screen that an alarm has been issued, and also causes an audio output device (not shown) to output an alarm sound. This allows the workers in the central control room to recognize that there is a possibility that seawater leakage has occurred in the condenser 35.

[0034] (Presenting the predicted results of seawater leakage trends) 1A and 1B, the central control device 110 predicts future trends in seawater leakage based on acid electrical conductivity information successively received from the measurement control device 120. Specifically, the central control device 110 calculates the trends in chloride ion concentration in the feedwater W up to the present time based on the correlation information between acid electrical conductivity and chloride ion concentration shown in FIG. 3 and the acid electrical conductivity information successively received from the measurement control device 120, and predicts the future trends in chloride ion concentration in the feedwater W by extrapolating from the calculated trends in chloride ion concentration in the feedwater W up to the present time. The central control device 110 then causes the display device 115 to display the prediction results on its screen.

[0035] 4 is a diagram showing an example of an image displaying the predicted results of the transition of the chloride ion concentration in the high-pressure drum water W3. The central control unit 110 causes the display device 115 to display an image 200 of the predicted results. The prediction result image 200 includes a graph 210 with, for example, time on the horizontal axis and chloride ion concentration on the vertical axis. This graph 210 shows graph lines 211 and 212 that show the change in chloride ion concentration in the feedwater W (high-pressure drum water W3) up to the present time (time Tn), and a graph line 213 that shows the future change in chloride ion concentration. The time T0 is the time when the alarm is issued, and the time Tn is the predicted time, which will be described later.

[0036] A graph line 211 shows the chloride ion concentration of the drum water W3 in the high-pressure drum 72, calculated from the acid electrical conductivity of the drum water W3 obtained from the sampling point P3. A graph line 212 indicates the chloride ion concentration of the drum water W3 calculated as follows from the acid electrical conductivity of the feedwater W at the outlet of the condensate pump 36 obtained from the sampling point P1. The chloride ion concentration of the drum water W3 can be calculated from the acid electrical conductivity of the feedwater W at the outlet of the condensate pump 36 obtained from the sampling point P1 by using the following equation (1). "Converted chloride ion concentration of high-pressure drum water from condensate pump outlet CC measurement value" value [mg / L] = Previous "Converted from condensate pump outlet CC measurement value" value [mg / L] + Chloride ion concentration in condensate (Note 1) [mg / L] x Measurement value of high-pressure drum feedwater flow rate [m 3 / h] x elapsed time since the previous calculation [h] ÷Volume of water held in the high-pressure drum calculated from the measured value of the high-pressure drum water level [m 3 ] ···(1) (Note 1) The chloride ion concentration of the drum water can be obtained from the measured value of CC at the condensate pump outlet and the relationship between acid electrical conductivity and chloride ion concentration of the drum water in Figure 3.

[0037] Here, "conversion of chloride ion concentration in high-pressure drum water from condensate pump outlet CC measurement value" is the acid electrical conductivity of the feedwater W at the outlet of the condensate pump 36, obtained from sampling point P1. When seawater is leaking, the chloride ion concentration at the condensate pump outlet is low and difficult to detect. For this reason, the chloride ion concentration in concentrated high-pressure drum water is converted using equation (1) above. Because high-pressure drum water is concentrated, the chloride ion concentration can be immediately measured according to the relationship in Figure 3. To increase reliability, both methods are used in parallel.

[0038] The future change in the chloride ion concentration may be determined based on the change in the chloride ion concentration up to the present time, which is calculated, for example, by the least squares method using the chloride ion concentration based on the acid electrical conductivity of the drum water W3 in the high-pressure drum 72 and the chloride ion concentration of the drum water W3 calculated as described above based on the acid electrical conductivity of the feedwater W at the outlet of the condensate pump 36. Furthermore, the future change in the chloride ion concentration may be determined based on the change in the chloride ion concentration up to the present time, which is calculated, for example, by the least squares method, from the chloride ion concentration based on the acid electrical conductivity of the drum water W3 in the high-pressure drum 72 and the chloride ion concentration of the drum water W3 calculated as described above based on the acid electrical conductivity of the feedwater W at the inlet of the low-pressure economizer 51 obtained from the sampling point P2. The future change in the chloride ion concentration may be determined based on the change in the chloride ion concentration up to the present time, which is determined, for example, by the least squares method from the chloride ion concentration based on the acid electrical conductivity of the drum water W3 in the high-pressure drum 72, the chloride ion concentration of the drum water W3 determined as described above based on the acid electrical conductivity of the feedwater W at the outlet of the condensate pump 36, and the chloride ion concentration of the drum water W3 determined as described above based on the acid electrical conductivity of the feedwater W at the inlet of the low-pressure economizer 51.

[0039] In the combined cycle plant 10 of this embodiment, in order to prevent the combined cycle plant 10 from being damaged by leakage of seawater, the combined cycle plant 10 is stopped when the chloride ion concentration of the drum water W3 reaches 1 mg / L. The image 200 of the prediction result also shows the predicted time until the chloride ion concentration in the drum water W3 reaches 1 [mg / L], which serves as a guideline for shutting down the combined cycle plant 10. This predicted time may be the remaining time (T1-Tn) until the chloride ion concentration in the drum water W3 reaches 1 [mg / L], or may be the predicted time (time T1) at which the chloride ion concentration in the drum water W3 reaches 1 [mg / L]. That is, the central control device 110 calculates the predicted time based on the predicted result of the future transition of the chloride ion concentration obtained as described above, and causes the display device 115 to display the predicted time on the screen.

[0040] As such, the seawater leakage warning device 1 of this embodiment comprises an electrical conductivity meter 91 that measures the acid electrical conductivity of the feedwater W in the water supply system 20 of the combined cycle plant 10, a measurement control device 120 configured to output an alarm signal based on the acid electrical conductivity measured by at least one electrical conductivity meter 91, and a central control device 110 configured to predict the progression of seawater leakage into the feedwater W based on the acid electrical conductivity measured by the electrical conductivity meter 91 and output the prediction result. This makes it possible to easily grasp the time when it is desirable to stop the combined cycle plant 10 when the seawater SW is leaking, based on the predicted results of the progress of seawater leakage into the feedwater W.

[0041] In the seawater leakage alarm device 1 according to this embodiment, the central control device 110 may be configured to output the prediction result as the prediction result of the chloride ion concentration in the feedwater. Since water quality management of the supply water W is generally performed using chloride ion concentration, it is easier to understand the water quality status when checking the prediction results compared to when the prediction results are expressed using other indicators than chloride ion concentration.

[0042] In the seawater leakage alarm device 1 of this embodiment, the central control unit 110 is preferably configured to output a predicted time until the chloride ion concentration in the supply water W reaches a predetermined set value (1 mg / L). This makes it easy to determine when it is desirable to shut down the combined cycle plant 10 in the event of a seawater SW leak.

[0043] In the seawater leakage alarm device 1 according to this embodiment, the feedwater W whose acid electrical conductivity is measured by the electrical conductivity meter 91 may be the drum water W1, W2, W3 of at least any one of the steam drums 52, 62, 72. If a seawater leak occurs, seawater components are concentrated in the steam drums 52, 62, 72. Therefore, by measuring the acid electrical conductivity of drum water W1, W2, W3 in any of the steam drums 52, 62, 72, it is possible to detect a seawater leak into the feedwater W earlier and with higher accuracy than when the acid electrical conductivity of the feedwater W at a location other than the steam drums 52, 62, 72 is measured.

[0044] In the seawater leakage alarm device 1 according to this embodiment, the supply water W whose acid electrical conductivity is measured by the electrical conductivity meter 91 is preferably supplied at at least two locations in the water supply system 20. By using measurements of the acid conductivity of the feedwater at different locations in the water supply system 20, the reliability of the measurement results can be improved. That is, if the measurement results of the acid electrical conductivity of the feed water W at different locations in the water supply system 20 are similar, it can be determined that the reliability of the measurement results is high. Furthermore, if there is a relatively large difference between the measurement results of the acid electrical conductivity of the feed water W at different locations in the water supply system 20, it is possible that there was a problem in the process of measuring one of the acid electrical conductivities, and by correcting the problem and performing the measurement again, the reliability of the measurement results can be improved.

[0045] In the seawater leakage alarm device 1 according to this embodiment, the central control device 110 may be configured to output a prediction result based on the measurement results of the acid electrical conductivity of the feedwater W at least two locations. As a result, by using the measurement results of the acid electrical conductivity of the feedwater W at different locations in the water supply system 20, the reliability of the prediction results of the progress of seawater leakage into the feedwater W can be improved.

[0046] (Regarding the shutdown of Combined Cycle Plant 10) The central control device 110 according to this embodiment is configured to shut down the combined cycle plant 10 when the chloride ion concentration in the drum water W3 reaches 1 mg / L. Specifically, when the central control device 110 determines that the chloride ion concentration in the drum water W3 has reached 1 mg / L based on the acid electrical conductivity information successively received from the measurement control device 120, it is configured to output a control signal to shut down the combined cycle plant 10. As a result, when the chloride ion concentration in the drum water W3 reaches 1 mg / L, the combined cycle plant 10 is automatically shut down.

[0047] In addition, the central control device 110 may be configured to output a control signal to stop the combined cycle plant 10 after the above-mentioned predicted time has elapsed, rather than when it is determined that the chloride ion concentration in the drum water W3 has reached 1 mg / L. This allows the steam turbine plant to be automatically shut down, making it possible to prevent malfunctions in the steam turbine plant. Furthermore, instead of the central control device 110 automatically shutting down the combined cycle plant 10 based on the chloride ion concentration of the drum water W3, an operator may manually shut down the combined cycle plant 10 when the above-mentioned predicted time has elapsed.

[0048] 1B , in a case where a first condenser 35A and a second condenser 35B are provided, the central control device 110 may be configured to stop operation of either the first condenser 35A or the second condenser 35B when determining that a seawater leak has occurred in either one of the first condenser 35A or the second condenser 35B based on the acid electrical conductivity of the first feedwater WA and the second feedwater WB. That is, when the central control device 110 determines that a seawater leak has occurred in either the first condenser 35A or the second condenser 35B based on the acid electrical conductivity of the first feedwater WA and the second feedwater WB, the central control device 110 may be configured to output a control signal to stop operation of either one of the condensers 35 when it determines that the chloride ion concentration of the drum water W3 has reached 1 mg / L.

[0049] In this way, the central control unit 110 may be configured to output a control signal to stop operation of either the first condenser 35A or the second condenser 35B when it determines that there is a seawater leak in either the first condenser 35A or the second condenser 35B based on the acid electrical conductivity of the first feedwater WA and the acid electrical conductivity of the second feedwater WB. This makes it possible to prevent a breakdown in one of the condensers 35 from which seawater is leaking, and also allows the operation of the other condenser 35 to continue, thereby enabling the operation of the combined cycle plant 10 to continue.

[0050] The central control device 110 may be configured to output a control signal for stopping the operation of one of the condensers 35 when the predicted time has elapsed, rather than when it is determined that the chloride ion concentration in the drum water W3 has reached 1 mg / L. Furthermore, instead of the central control unit 110 automatically stopping the operation of one of the condensers 35 based on the chloride ion concentration of the drum water W3, an operator may manually stop the operation of one of the condensers 35 when the above-mentioned predicted time has elapsed.

[0051] 5 is a flowchart showing the procedure of the processing performed by the central control device 110 regarding the issuance of the above-mentioned alarm and the shutdown of the combined cycle plant 10. The processing shown in FIG. 5 is performed by the processor 111 executing a program stored in the memory 113. In step S10, the central control device 110 waits until it receives the above-mentioned alarm signal from the measurement control device 120. Upon receiving the alarm signal, in step S20, the central control unit 110 outputs a signal to display on the display device 115 that an alarm has been issued and a signal to output an alarm sound from an audio output device (not shown). The central control unit 110 then performs calculations to obtain graphs 211, 212, and 213 shown in FIG. 4. Based on the acid conductivity information of the feedwater W and the drum water W3 sequentially received from the measurement control device 120, the correlation information between acid conductivity and chloride ion concentration stored in memory 113 (see FIG. 3), and the above equation (1), the central control unit 110 calculates the current trend in the chloride ion concentration in the drum water W3 by extrapolation from the calculated current trend in the chloride ion concentration in the drum water W3, and also calculates the predicted time until the chloride ion concentration in the drum water W3 reaches 1 mg / L. When predicting future trends by extrapolating the above-mentioned changes in chloride ion concentration, the prediction may be made from the average value of the chloride ion concentration obtained from the drum water W3 and the chloride ion concentration obtained by the above-mentioned equation (1). The central control device 110 generates a signal for displaying the prediction result (see FIG. 4) on the display device 115, and outputs the signal to the display device 115. The prediction of the future change in the chloride ion concentration in the drum water W3 is subsequently executed sequentially and updated, and the updated prediction result is displayed on the display device 115.

[0052] In step S30, the central control device 110 outputs information to the information processing device 130 to assist in the check operation, which will be described later, of the sampling device 90. The information output by the central control device 110 in step S30 will be described in detail later.

[0053] In step S40, the central control device 110 waits until it is confirmed that the checking operation of the sampling device 90 has been completed, and transmits information required by the information processing device 130 each time, as will be described later. Also, for example, when the worker performing the checking work sends a signal indicating that the checking work has been completed via the information processing device 130 and the central control device 110 determines that it has received the signal, the central control device 110 determines that the checking work of the sampling device 90 has been completed.

[0054] When the central control device 110 determines in step S40 that the checking operation of the sampling device 90 has been completed, it determines in step S50 whether or not the above-mentioned alarm signal has been received from the measurement control device 120. If the measurement control device 120 continues to output an alarm signal based on the acid electrical conductivity information from the sampling device 90 after the check operation has been completed, the reliability of the alarm, i.e., the reliability of the measured acid electrical conductivity value, is considered to be high. Therefore, when it is determined in step S50 that the above-mentioned alarm signal has been received from the measurement control device 120, the central control device 110 recalculates the change in chloride ion concentration in the feedwater W up to the present time in step S60. The central control device 110 then extrapolates the change in chloride ion concentration in the feedwater W up to the present time to predict the future change in chloride ion concentration in the drum water W3, and also calculates the predicted time until the chloride ion concentration in the drum water W3 reaches 1 mg / L. The central control unit 110 generates a signal for displaying the results of the re-prediction on the display device 115, and outputs the signal to the display device 115. The prediction of the future change in the chloride ion concentration in the drum water W3 is subsequently executed sequentially and updated, and the updated prediction results are displayed on the display device 115.

[0055] On the other hand, if an alarm signal was received in step S10 due to an increase in the measured acid electrical conductivity value caused by a malfunction in the acid electrical conductivity measurement process, the reliability of the measured acid electrical conductivity value can be restored by checking by an operator. Therefore, if an alarm signal is not received from the measurement control device 120 in step S50, the alarm signal received in step S10 is likely to be a false alarm caused by a malfunction in the acid electrical conductivity measurement process. Therefore, if it is determined in step S50 that an alarm signal has not been received from the measurement control device 120, the measurement control device 120 returns to step S10.

[0056] The central control device 110 waits in step S70 until the predicted time calculated in step S60 has elapsed, and when the predicted time has elapsed, it outputs a control signal to stop the combined cycle plant 10 in step S80, thereby terminating the processing of this program.

[0057] (Regarding the checking of the sampling device 90) 1A and 1B, when the acid electrical conductivity of the feedwater W or drum water W3 from any of the sampling points P1, P2, and P3 exceeds a preset value, an alarm is issued as described above. After that, when the predicted time described above has elapsed, the combined cycle plant 10 will automatically shut down. However, if the increase in the measured acid electrical conductivity value is due to a malfunction in the acid electrical conductivity measurement process, the combined cycle plant 10 will be shut down even though it would not normally be necessary to shut it down.

[0058] Therefore, if it is determined that the acid electrical conductivity of the feedwater W or drum water W3 from any of the sampling points P1, P2, and P3 exceeds a preset value, confirmation work by a worker with specialized skills, such as manual analysis by a worker skilled in water treatment and water analysis, is required. However, if a worker with specialized skills is not available, it is difficult to respond in an emergency. Therefore, it is desirable to make it possible for even workers other than those with specialized skills to check whether or not there has been a problem in the process of measuring the acid electrical conductivity.

[0059] Therefore, in the combined cycle plant 10 shown in FIGS. 1A and 1B, information related to the checking work is presented to the worker to support the checking work, as will be described below. The confirmation work performed by the worker in the above situation is, for example, the check work of the sampling device 90 as described below. The following describes the work of checking the sampling device 90 by the worker and the presentation of information to assist this checking work.

[0060] As described above, when an alarm signal is output from the measurement control device 120, a screen indicating that an alarm has been issued is displayed on the display device 115, and an alarm sound is output from an audio output device (not shown). This screen display and alarm sound allow an operator to recognize that the acid electrical conductivity of the feedwater W or drum water W3 from any of the sampling points P1, P2, and P3 has exceeded a preset value. The operator must then go to the location of the sampling device 90 in the combined cycle plant 10 to check the sampling device 90. At that time, the operator carries the information processing device 130.

[0061] Information for assisting the worker in checking the sampling device 90 is successively transmitted from the measurement control device 120 to an information processing device 130 carried by the worker. The worker can check the sampling device 90 while checking the information successively transmitted from the measurement control device 120 on the information processing device 130.

[0062] An example of information presented on the information processing device 130 to assist in the checking work will be described below. 6A to 6D are diagrams showing examples of display screens displayed on the display unit 138 of the information processing device 130. The display screens shown in Fig. 6A to 6D are based on information sequentially transmitted from the measurement control device 120 in step S30 of the flowchart in Fig. 5.

[0063] First, a display screen 301 showing the procedure of the check work is displayed on the display unit 138 of the information processing device 130 as shown in FIG. 6A. The display screen 301 displays the following instructions in the order in which the check work should be carried out: go to the chemical analysis lab, prepare the necessary equipment in the chemical analysis lab, go to the sampling device 90, check the flow meter, check the ion exchange resin, and return to the central control room.

[0064] The display screen 301 also displays operation buttons 311, 312, 313, 314, and 315 for displaying information showing details of each implementation content. When an operator operates the operation button 311 displayed near the instruction to go to the chemical analysis laboratory, information indicating how to get to the chemical analysis laboratory, such as information about the location of the chemical analysis laboratory, is displayed on the display screen 301 (not shown).

[0065] When a worker who has arrived at the chemical analysis room operates the operation button 312 displayed near the instructions instructing the worker to prepare the necessary equipment in the chemical analysis room, the display screen 301 displays information about the equipment necessary for checking the sampling device 90, such as a beaker and a portable pH meter (not shown).

[0066] When an operator operates the operation button 313 displayed near the instruction to go to the sampling device 90, information indicating how to get to the sampling device 90, such as information regarding the location of the sampling device 90, is displayed on the display screen 301 (not shown).

[0067] When an operator operates the operation button 314 displayed near the instruction to check the flow meter, the imaging unit 135 starts taking a video, and the display screen 301 (Figure 6A) displays an instruction (not shown) encouraging the operator to take a video of the flow meter of the sampling device 90. Image information of the moving image captured by the imaging unit 135 and information such as the current position, posture, and orientation of the information processing device 130 detected by the detection device 136 of the information processing device 130 are transmitted to the central control device 110 in real time.

[0068] Based on this information transmitted from the information processing device 130, the central control device 110 transmits to the information processing device 130 information on the content to be superimposed on the display image of the video captured by the imaging unit 135, which is displayed on the display unit 138 of the information processing device 130. For example, based on the information transmitted from the information processing device 130, the central control device 110 identifies a flow meter 401a that the worker should check among the multiple flow meters 401 in the video captured by the imaging unit 135. Then, the central control device 110 transmits to the information processing device 130 information for superimposing a marker 403 indicating which flow meter 401a the worker should check and an information display 404 indicating, for example, the next instruction content on the display image of the video displayed on the display unit 138 of the information processing device 130. As a result, as shown in FIG. 6B , for example, on the display screen 302 of the video captured by the imaging unit 135, the marker 403 indicating which flow meter 401a the worker should check and the information display 404 indicating the next instruction content are superimposed on the display screen 302 of the video captured by the imaging unit 135 on the display unit 138 of the information processing device 130.

[0069] When the central control unit 110 determines, based on the information transmitted from the information processing device 130, that the flow meter 401a that the worker should check is being photographed in an enlarged manner, it transmits the following information to the information processing device 130 to be superimposed on the display screen 303 (see Figure 6C) of the video captured by the imaging unit 135: Here, the information transmitted to the information processing device 130 includes, for example, as shown in FIG. 6C, information about a marker 405 indicating the position where the float 402 of the flow meter 401a should be, an information display 406 prompting the user to check the position of the float 402, a marker 408 indicating the position of an operating valve 407 for adjusting the flow rate of the flow meter 401a, and an information display 409 for explaining the operation for adjusting the flow rate of the flow meter 401a. As a result, the display unit 138 of the information processing device 130 displays the marker 405, the information display 406, the marker 408, and the information display 409 superimposed on the display screen 303 of the moving image captured by the imaging unit 135, as shown in FIG. 6C. By checking the display screen 302 shown in FIG. 6B or the display screen 303 shown in FIG. 6C, the worker can easily check the flow meter 401a that needs to be checked and adjust the flow rate.

[0070] When the operator operates the operation button 315 displayed near the instruction to check the ion exchange resin, the imaging unit 135 begins taking a video, and the display screen 301 (Figure 6A) displays instructions (not shown) encouraging the operator to take a video of multiple tubes 411 (Figure 6D) that discharge the supply water W sampled in the sampling device 90. Image information of the moving image captured by the imaging unit 135 and information such as the current position, posture, and orientation of the information processing device 130 detected by the detection device 136 of the information processing device 130 are transmitted to the central control device 110 in real time.

[0071] Based on this information transmitted from the information processing device 130, the central control device 110 transmits to the information processing device 130 information on the content to be superimposed on the display image of the video captured by the imaging unit 135, which is displayed on the display unit 138 of the information processing device 130. For example, based on the information transmitted from the information processing device 130, the central control device 110 identifies, among the multiple tubes 411 in the video captured by the imaging unit 135, a tube 411a through which the drainage water W flows and through which the worker should check the pH value. Then, the central control device 110 transmits to the information processing device 130 information for superimposing a marker 412 indicating which tube 411a the worker should check and an information display 413 indicating, for example, the next instruction, on the display image of the video displayed on the display unit 138 of the information processing device 130. As a result, as shown in FIG. 6D , for example, on the display screen 304 of the video captured by the imaging unit 135, the marker 412 indicating which tube 411a the worker should check and the information display 413 indicating the next instruction are superimposed on the display screen 304 of the video captured by the imaging unit 135 on the display unit 138 of the information processing device 130.

[0072] Here, the reason for checking the pH value of the discharged feedwater W will be explained. When measuring the acid electrical conductivity of the feedwater W, as described with reference to FIG. 2, the acid electrical conductivity of the feedwater W is measured after sodium ions derived from seawater have been exchanged for hydrogen ions in the cation exchange resin tower 94. Therefore, if the cation exchange resin in the cation exchange resin tower 94 breaks down, the sodium ions derived from seawater cannot be exchanged for hydrogen ions, and accurate measurement of the acid electrical conductivity becomes impossible. Therefore, to ensure accurate measurement of the acid electrical conductivity, whether or not the cation exchange resin in the cation exchange resin tower 94 has broken down is confirmed by the pH value of the feedwater W after it has passed through the cation exchange resin tower 94. If the cation exchange resin in the cation exchange resin tower 94 is not broken, sodium ions derived from seawater are exchanged for hydrogen ions, and the pH value of the feed water W after passing through the cation exchange resin tower 94 decreases. Conversely, if the cation exchange resin in the cation exchange resin tower 94 is broken, sodium ions derived from seawater are not exchanged for hydrogen ions, and the pH value of the feed water W after passing through the cation exchange resin tower 94 does not decrease.

[0073] 1A and 1B, feedwater W and the like are sampled from sampling points other than the above-described sampling points P1, P2, and P3, supplied to the sampling device 90, and then discharged from the sampling device 90. Therefore, as described above, there are a plurality of tubes 411 through which discharged water flows, in addition to the tube 411a that the operator should check.

[0074] If the pH value of the wastewater from the tube 411a measured by the worker is less than 4, the cation exchange resin in the cation exchange resin tower 94 has not broken, and the check operation is completed. However, if the pH value of the wastewater from tube 411a measured by the worker is 4 or higher, the cation exchange resin in cation exchange resin tower 94 has broken down, and the worker must replace the cation exchange resin in cation exchange resin tower 94. When it is decided to replace the cation exchange resin in the cation exchange resin tower 94 in accordance with the information display 413 indicating the next instruction on the display screen 304, an instruction prompting the user to take a video of the cation exchange resin tower 94 of the sampling device 90 is displayed on the display screen 304 (not shown).

[0075] When the worker captures a video of the location where multiple cation exchange resin towers are located in the sampling device 90 in accordance with the instructions, the central control device 110, based on various information transmitted from the information processing device 130, identifies the cation exchange resin tower 94 in which the worker should replace the cation exchange resin among the multiple cation exchange resin towers 95 in the video captured by the imaging unit 135. The central control device 110 then transmits information to the information processing device 130 for superimposing a marker 415 indicating which cation exchange resin tower 94 the worker should replace the cation exchange resin in on the display image of the video displayed on the display unit 138 of the information processing device 130, and an information display 416 indicating, for example, the next instruction. As a result, as shown in FIG. 6E , for example, on the display screen 305 of the video captured by the imaging unit 135, the marker 415 indicating which cation exchange resin tower 94 the worker should replace the cation exchange resin in and the information display 416 indicating the next instruction are superimposed. The worker can easily replace the cation exchange resin in the cation exchange resin tower 94 by checking the display screen 305 shown in FIG. 6E.

[0076] In the above description, the information presented by the information processing device 130 to assist in the work is information about the check work of the sampling device 90, but it may also be information to assist in other work required in the combined cycle plant 10 other than the check work of the sampling device 90 described above.

[0077] In this way, the seawater leakage warning device 1 in some embodiments is equipped with a central control device 110 that can wirelessly output information to the information processing device 130, which is capable of photographing and can be carried by an operator, to be superimposed on an image captured by the information processing device 130, after an alarm signal is output from the measurement control device 120. This allows even an inexperienced worker to easily perform confirmation work and the like in the combined cycle plant 10 based on the information presented by the information processing device 130.

[0078] The present disclosure is not limited to the above-described embodiments, but also includes modifications to the above-described embodiments and appropriate combinations of these modifications.

[0079] The contents described in each of the above embodiments can be understood, for example, as follows. (1) A seawater leakage warning device 1 according to at least one embodiment of the present disclosure is a seawater leakage warning device 1 for a steam turbine plant (combined cycle plant 10) that includes steam drums (high-pressure drum 72, medium-pressure drum 62, low-pressure drum 52), a steam turbine 13 configured to be driven by steam S generated in the steam drum (high-pressure drum 72), and a condenser 35 configured to cool the steam S discharged from the steam turbine 13 with seawater SW to generate feedwater. A seawater leakage warning device 1 according to at least one embodiment of the present disclosure comprises an acid electrical conductivity meter 91 that measures the acid electrical conductivity of feedwater W in a feedwater system 20 of a steam turbine plant (combined cycle plant 10), an alarm signal output device (measurement control device 120) configured to output an alarm signal based on the acid electrical conductivity measured by at least one acid electrical conductivity meter 91, and a prediction device (central control device 110) configured to predict the progression of seawater leakage into the feedwater W based on the acid electrical conductivity measured by the acid electrical conductivity meter 91 and output the prediction result.

[0080] According to the configuration (1) above, from the predicted results of the progress of seawater leakage into the feedwater W, it is possible to easily grasp the time when it is desirable to stop the steam turbine plant (combined cycle plant 10) when seawater SW is leaking.

[0081] (2) In some embodiments, in the configuration of (1) above, the prediction device (central control device 110) may be configured to output the prediction result as a prediction result of the chloride ion concentration in the feedwater W.

[0082] According to the above configuration (2), since water quality management of the water supply W is generally performed using chloride ion concentration, it is easier to understand the water quality status when checking the prediction results compared to when the prediction results are expressed using other indicators than chloride ion concentration.

[0083] (3) In some embodiments, in the configuration of (1) or (2) above, the prediction device (central control device 110) may be configured to output a predicted time until the chloride ion concentration in the supply water W reaches a predetermined set value.

[0084] According to the above configuration (3), it becomes easy to grasp the time when it is desirable to stop the steam turbine plant (combined cycle plant 10) when the seawater SW leaks.

[0085] (4) In some embodiments, in any of the configurations (1) to (3) above, the feedwater W whose acid electrical conductivity is measured by the acid electrical conductivity meter 91 may be at least the drum water (drum water W1, drum water W2, drum water W3) of the steam drums (high-pressure drum 72, medium-pressure drum 62, low-pressure drum 52).

[0086] If a seawater leak occurs, seawater components are concentrated in the steam drums (high-pressure drum 72, medium-pressure drum 62, low-pressure drum 52). According to the configuration (4) above, measuring the acid electrical conductivity of the drum water (drum water W1, drum water W2, drum water W3) enables earlier and more accurate detection of leakage of seawater SW into the feedwater W compared to measuring the acid electrical conductivity of locations other than the steam drums (high-pressure drum 72, medium-pressure drum 62, low-pressure drum 52).

[0087] (5) In some embodiments, in any of the configurations (1) to (4) above, the supply water W whose acid electrical conductivity is measured by the acid electrical conductivity meter 91 may be supply water W at at least two locations in the water supply system 20.

[0088] According to the above configuration (5), by using the measurement results of the acid electrical conductivity of the feed water W at different locations in the water supply system 20, the reliability of the measurement results can be improved. That is, if the measurement results of the acid electrical conductivity of the feed water W at different locations in the water supply system 20 are similar, it can be determined that the reliability of the measurement results is high. Furthermore, if there is a relatively large difference between the measurement results of the acid electrical conductivity of the feed water W at different locations in the water supply system 20, it is possible that there was a problem in the process of measuring one of the acid electrical conductivities, and by correcting the problem and performing the measurement again, the reliability of the measurement results can be improved.

[0089] (6) In some embodiments, in the configuration of (5) above, the prediction device (central control device 110) may be configured to output a prediction result based on measurement results of the acid electrical conductivity of the supply water W at at least two locations.

[0090] According to the above configuration (6), by using the measurement results of the acid electrical conductivity of the feedwater W at different points in the water supply system 20, the reliability of the prediction results of the progress of seawater leakage into the feedwater W can be improved.

[0091] (7) In some embodiments, in the configuration of (3) above, the prediction device (central control device 110) may be configured to output a control signal to stop the steam turbine plant (combined cycle plant 10) after the predicted time has elapsed.

[0092] According to the configuration (7) above, the steam turbine plant (combined cycle plant 10) can be automatically stopped, and malfunctions in the steam turbine plant (combined cycle plant 10) can be prevented in advance.

[0093] (8) In some embodiments, in any of the configurations described above in (1) to (7), the condenser 35 may include at least a first condenser 35A and a second condenser 35B. The acid electrical conductivity meter 91 may be capable of measuring the acid electrical conductivity of the first feedwater WA from the first condenser 35A and the acid electrical conductivity of the second feedwater WB from the second condenser 35B. The prediction device (central control device 110) may be configured to output a control signal to stop operation of one of the condensers 35 when it determines that a seawater leak has occurred in either the first condenser 35A or the second condenser 35B based on the measured acid electrical conductivity of the first feedwater WA and the acid electrical conductivity of the second feedwater WB.

[0094] According to the above configuration (8), it is possible to prevent a failure of either one of the condensers 35 from which seawater SW is leaking, and by continuing to operate the other condenser 35, it is possible to continue to operate the steam turbine plant (combined cycle plant 10).

[0095] (9) In some embodiments, in any of the configurations (1) to (8) above, an information output device (central control device 110) may be provided that, after an alarm signal is output from the alarm signal output device (measurement control device 120), can wirelessly output information to the information processing device 130, which is capable of taking photographs and is portable by an operator, to be superimposed on an image captured by the information processing device 130.

[0096] According to the configuration (9) above, even an inexperienced worker can easily perform confirmation work and the like in the steam turbine plant (combined cycle plant 10) based on the information presented by the information processing device 130. [Explanation of symbols]

[0097] 1 Seawater leakage alarm device 10. Combined cycle plant 12 Heat recovery steam generator (HRSG) 13 Steam turbine 20 Water supply system 31 High-pressure turbine 32 Intermediate pressure turbine 33 Low-pressure turbine 35 Condenser 35A No. 1 condenser 35B No. 2 condenser 52 Low-pressure drum 62 Medium pressure drum 72 High-pressure drum 90 Sampling Device 91 Electrical conductivity meter 92 pH meter 110 Central Control Unit 120 Measurement and control device 130 Information processing equipment

Claims

1. A seawater leakage alarm device for a steam turbine plant including a steam drum, a steam turbine configured to be driven by steam generated by the steam drum, and a condenser configured to cool steam discharged from the steam turbine with seawater to generate feedwater, an acid electrical conductivity meter that measures the acid electrical conductivity of the feedwater in a feedwater system of the steam turbine plant; an alarm signal output device configured to output an alarm signal based on the acid conductivity measured by the at least one acid conductivity meter; a prediction device configured to predict a progression of seawater leakage into the feedwater based on the acid electrical conductivity measured by the acid electrical conductivity meter and output a prediction result; A seawater leakage alarm device equipped with:

2. the prediction device is configured to output the prediction result as a prediction result of the chloride ion concentration in the feedwater. The seawater leakage alarm device according to claim 1.

3. the prediction device is configured to output a predicted time until the chloride ion concentration in the feedwater reaches a preset value. The seawater leakage alarm device according to claim 1 or 2.

4. the feedwater whose acid electrical conductivity is measured by the acid electrical conductivity meter is at least drum water of the steam drum; The seawater leakage alarm device according to claim 1.

5. The supply water whose acid electrical conductivity is measured by the acid electrical conductivity meter is water supplied at at least two locations in the water supply system. The seawater leakage alarm device according to claim 1.

6. The prediction device is configured to output the prediction result based on the measurement results of the acid electrical conductivity of the feedwater at the at least two locations. The seawater leakage alarm device according to claim 5.

7. the prediction device is configured to output a control signal for stopping the steam turbine plant after the predicted time has elapsed. The seawater leakage alarm device according to claim 3.

8. The condenser includes at least a first condenser and a second condenser, the acid electrical conductivity meter is capable of measuring the acid electrical conductivity of the first feedwater from the first condenser and the acid electrical conductivity of the second feedwater from the second condenser, the prediction device is configured to output a control signal to stop operation of either the first condenser or the second condenser when it determines that seawater leakage has occurred in either the first condenser or the second condenser based on the measured acid electrical conductivity of the first feedwater and the measured acid electrical conductivity of the second feedwater. The seawater leakage alarm device according to claim 1.

9. an information output device capable of wirelessly outputting, to an information processing device capable of photographing and being carried by a worker, information to be superimposed on an image obtained by photographing with the information processing device, after the alarm signal is output from the alarm signal output device, based on information from the information processing device, The seawater leakage alarm device according to claim 1.

Images