JP2017020938A - Monitoring device, steam turbine facility including the same, and method for monitoring steam turbine facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring device of highly-reliable steam turbine facility.SOLUTION: Steam turbine facility comprises a steam turbine 2 driven by steam, a steam system B including a boiler 3 which generates steam and a steam line 7 which supplies steam from the boiler 3 to the steam turbine 2, and a water supply system A including a condenser 4 which condenses the exhaust of the steam turbine 2 and a water supply line 6 which supplies water from the condenser 4 to the boiler 3. A monitoring device 1 comprises: an input unit 101 which accepts a detection value of electric conductivity of water and a detection value of electric conductivity of steam; a comparison unit 102 which compares the detection value of electric conductivity of water and the detection value of electric conductivity of steam accepted by the input unit 101; and an output unit 104 which outputs information based on the comparison results of the comparison unit 102.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an apparatus and a method for monitoring electrical conductivity of water and steam in a steam turbine facility.

  A power plant such as a thermal power plant having a boiler generates power by introducing steam output from the boiler into a steam turbine via a steam line. After the steam is used to drive the steam turbine, it is cooled by seawater or the like flowing through a cooling pipe in a condenser and returned to water (condensate). The condenser water is sent to the boiler by a condensate pump via a water supply line. The water sent to the boiler is converted again into steam and circulated by being supplied to the steam turbine. As described above, the steam turbine equipment forms a circulation system as a whole.

In such a steam turbine facility, pure water is used. In order to monitor the quality of the pure water, a sample solution is collected from a condenser or a condensate pump, and the collected sample solution is used as a cation exchange resin. A water quality monitoring device for detecting the electrical conductivity after passing (hereinafter referred to as “acid electrical conductivity”) is installed in the water supply line.
Here, when the seawater for cooling leaks into the circulating water, the acid electrical conductivity detected by the water quality monitoring device increases. For this reason, by monitoring the acid electrical conductivity, leakage of seawater can be detected, and corrosion of piping and equipment in the circulation system due to the leaked seawater can be prevented.

  Conventional water quality monitoring devices not only collect water from condensers and the like, but also monitor the water quality at each location by collecting sample liquid from various locations such as in the middle of a water supply line or in a drum ( Patent Document 1).

JP 2009-243972 A

  Here, when the carbon dioxide gas in the air dissolves in the circulating water, the dissolved carbon dioxide component passes through the cation exchange resin and reaches the water quality monitoring device, thereby increasing the detected acid electrical conductivity. Since the dissolved carbon dioxide component is different from the corrosive substance, the acid electrical conductivity of the corrosive substance to be monitored cannot be accurately measured if the carbon dioxide component is present. As in Patent Document 1, even if water is collected in various places such as in the middle of a water supply line or in the drum of a boiler, the dissolved carbon dioxide component is present everywhere. There is a problem of misdetecting. Therefore, there is a strong demand for a highly reliable monitoring apparatus for steam turbine equipment that suppresses the influence of the dissolved carbon dioxide component.

  In view of the above problems, an object of the present invention is to provide a highly reliable steam turbine equipment monitoring apparatus.

  A first aspect includes a steam turbine driven by steam, a steam generating steam and a steam system including a steam line supplying steam from the boiler to the steam turbine, and condensate for returning the exhaust of the steam turbine to water. And a water supply system including a water supply system for supplying water from the condenser to the boiler, the steam turbine equipment monitoring device, the detected value of the electrical conductivity of the water and the electrical conductivity of the steam An input unit that receives a detection value, a comparison unit that compares the detection value of the electrical conductivity of the water received by the input unit and the detection value of the electrical conductivity of the steam, and information based on the comparison result of the comparison unit An output unit for outputting.

  In the monitoring device, by comparing the detected value of the electrical conductivity of water and the detected value of the electrical conductivity of steam, a monitored value that eliminates the influence of carbon dioxide circulating in the water supply system and the steam system is obtained. Therefore, a highly reliable monitoring device for water and steam steam turbine equipment can be realized.

  Moreover, the 2nd aspect is a monitoring apparatus of the steam turbine equipment of a 1st aspect, It is provided with the determination part which determines the abnormality of the said water supply system or the said steam system from the comparison result of the said comparison part, The said output part is The determination result in the determination unit is output as information.

  In the monitoring device, from the comparison result, it is possible to quickly and accurately determine the abnormality without waiting for the observer's evaluation. Therefore, it is possible to quickly and accurately determine the abnormality and the highly reliable water and steam. A monitoring device for steam turbine equipment can be realized.

  Further, according to a third aspect, in the electrical conductivity monitoring device according to the first or second aspect, the comparison unit includes a detected value of the electrical conductivity of the water and a detected value of the electrical conductivity of the steam as a comparison result. Find the square root of the difference between and the absolute value of the difference.

  In the monitoring device, by calculating the square root of the difference between the detected value of the electrical conductivity of the water and the detected value of the electrical conductivity of the steam or the absolute value of the difference, it is possible to calculate and judge relatively easily. Since it is possible to reliably determine an abnormality, a simple and reliable monitoring device for water and steam steam turbine equipment can be realized.

  Further, a fourth aspect is the monitoring device according to any one of the first to third aspects, wherein the comparison unit includes a detection value of the electrical conductivity of the water and a detection value of the electrical conductivity of the steam as a comparison result. A parameter indicating the magnitude relationship between and is obtained.

  Since the monitoring device obtains parameters capable of discriminating leakage of seawater and mixing of electrolytes into steam, a highly functional and highly reliable monitoring device for steam turbine equipment for water and steam can be realized.

  According to a fifth aspect, in the monitoring device according to the fourth aspect, the parameter is a difference or a ratio between a detected value of the electrical conductivity of the water and a detected value of the electrical conductivity of the steam.

  In this monitoring device, since it is possible to determine whether seawater leaks or the electrolyte is mixed into the steam using the result of a simple calculation, the monitoring device for water and steam steam turbine equipment is simple but highly functional and reliable. Can be realized.

  In addition, according to a sixth aspect, in the monitoring apparatus for steam turbine equipment of the fourth or fifth aspect, when the detected value of the electrical conductivity of the water is larger than the detected value of the electrical conductivity of the steam, the water supply system When the detected value of the electrical conductivity of the steam is larger than the detected value of the electrical conductivity of the water, a determination unit that determines that the steam system is abnormal is provided.

  Since the monitoring device can determine whether the water supply system is abnormal or the steam system is abnormal, a highly functional and highly reliable monitoring device for water and steam steam turbine equipment can be realized.

  In a seventh aspect, in the steam turbine equipment monitoring apparatus according to any one of the first to sixth aspects, the comparison result of the comparison section when the output of the steam turbine equipment changes is masked.

  In the monitoring apparatus, since abnormality is not erroneously detected when the output of the steam turbine equipment is fluctuated, a more reliable monitoring apparatus for water and steam steam turbine equipment can be realized.

  The eighth aspect is a monitoring device for steam turbine equipment according to any one of the first to seventh aspects, wherein the first detection unit detects the value of the electrical conductivity of water in the water supply system, A second detection unit that detects a value of electrical conductivity of steam in the steam system, and the input unit detects the detected value of electrical conductivity of the water detected by the first detection unit and the second value. The detected value of the electrical conductivity of the vapor detected by the two detectors is received.

  In the monitoring device, a detection unit is separately provided by including a first detection unit that detects a detection value of the electrical conductivity of the water and a second detection unit that detects a detection value of the electrical conductivity of the steam. Since there is no need, it is possible to realize a water and steam steam turbine equipment monitoring device that is easy to handle and highly reliable.

  According to a ninth aspect, in the steam turbine facility monitoring apparatus according to the eighth aspect, each of the first detection unit and the second detection unit includes a deaeration unit for deaerating carbon dioxide gas.

  In this monitoring device, carbon dioxide gas is degassed and detected in the pretreatment, so that the influence of carbon dioxide gas that could not be completely eliminated can be offset after eliminating unnecessary carbon dioxide gas at the time of detection. Less detection is possible, and a more reliable monitoring device for steam turbine equipment for water and steam can be realized.

  The tenth aspect includes the steam turbine equipment monitoring apparatus according to any one of the first to ninth aspects, the steam turbine, the water supply system, and the steam system.

  Moreover, an eleventh aspect is a steam turbine driven by steam, a steam generating steam, a steam system including a steam line supplying steam from the boiler to the steam turbine, and returning the exhaust of the steam turbine to water. A steam turbine facility monitoring method comprising a condenser and a water supply system including a water supply line for supplying water from the condenser to the boiler, wherein the value of electric conductivity of water in the water supply system is detected. A first detection step, a second detection step for detecting a value of electrical conductivity of the steam in the steam system, a detected value of the electrical conductivity of the water detected in the first detection step, and the second detection An input step for receiving the detected value of the electrical conductivity of the vapor detected in the step, and a comparison step of comparing the detected value of the electrical conductivity of the water received in the input step with the detected value of the electrical conductivity And before Including an output step of outputting information based on the comparison result of the comparing step.

  A twelfth aspect includes a determination step of determining an abnormality of the water supply system or the steam system from a comparison result of the comparison step in the steam turbine facility monitoring method of the eleventh aspect, and in the output step, The determination result in the determination step is output as information.

  The thirteenth aspect is the electrical conductivity monitoring method according to the eleventh or twelfth aspect, in the comparison step, the detected value of the electrical conductivity of the water and the detected value of the electrical conductivity of the steam as a comparison result. Find the square root of the difference between and the absolute value of the difference.

  In a fourteenth aspect, in the monitoring method according to the eleventh to thirteenth aspects, in the comparison step, the detected value of the electrical conductivity of the water and the detected value of the electrical conductivity of the steam are compared in magnitude. A parameter indicating the relationship is obtained.

  According to a fifteenth aspect, in the steam turbine equipment monitoring method according to the fourteenth aspect, when the detected value of the electric conductivity of the water is larger than the detected value of the electric conductivity of the steam, the water supply system is abnormal. And determining when the detected value of the electrical conductivity of the steam is greater than the detected value of the electrical conductivity of the water, and determining that the steam system is abnormal.

  In one embodiment of the present invention, by comparing the detected value of the electrical conductivity of water and the detected value of the electrical conductivity of steam, an output that eliminates the influence of carbon dioxide circulating in the water supply system and the steam system is obtained. be able to. For this reason, according to one aspect of the present invention, highly reliable monitoring of water and steam steam turbine equipment can be realized.

It is a distribution diagram of steam turbine equipment in a first embodiment concerning the present invention. It is a systematic diagram of the process part in 1st embodiment which concerns on this invention. It is a flowchart in 1st embodiment which concerns on this invention. It is a systematic diagram of the steam turbine equipment of the modification in 1st embodiment which concerns on this invention. It is a flowchart in 2nd embodiment which concerns on this invention. It is a flowchart of the modification in 2nd embodiment which concerns on this invention. It is a graph of the actual monitoring result in embodiment which concerns on this invention. It is a graph of the actual monitoring result in embodiment which concerns on this invention.

  Hereinafter, various embodiments according to the present invention will be described with reference to the drawings.

"First embodiment"
1st Embodiment of the monitoring apparatus which concerns on this invention, and a steam turbine equipment provided with the same is described with reference to FIGS.

  As shown in FIG. 1, the steam turbine equipment of this embodiment includes a steam turbine 2 driven by steam, a boiler 3 that generates steam, and a condenser 4 that returns exhaust gas from the steam turbine 2 to water (condensate). A water supply line 6 for supplying water from the condenser 4 to the boiler 3 via the condensate pump 5, a steam line 7 for supplying steam from the boiler 3 to the steam turbine 2, and the monitoring device 1.

  The water supply system A of this embodiment includes a condenser 4, a condensate pump 5, and a water supply line 6. Further, the steam system B of the present embodiment includes a boiler 3 and a steam line 7.

  In order to monitor the water in the water supply system A, a part of the water flowing through the water supply line 6 is sampled by branching the sample pipe in the middle of the water supply line 6. The monitoring device 1 detects the acid electrical conductivity of the sampled water. The sampled water may be collected from any of the water supply systems A, and the condensate in the condenser 4 may be collected without being limited to the water in the water supply line 6.

  Furthermore, in order to monitor the steam of the steam system B, the monitoring device 1 branches a sample pipe in the middle of the steam line 7, thereby sampling a part of the steam flowing through the steam line 7. The monitoring device 1 returns the sampled steam to water and detects the acid electrical conductivity of the sampled steam. The steam to be sampled may be collected from any of the steam systems B, and is not limited to the steam in the steam line 7 but may be collected from the steam generated in the boiler 3.

  The monitoring device 1 includes a first detection unit 8, a second detection unit 9, and a processing unit 10. The monitoring device 1 not only monitors the water quality, but also needs to monitor the steam because so-called carryover (spray entrainment) may occur in which the electrolyte is mixed into the steam turbine side, as will be described later. Become.

The 1st detection part 8 is comprised with the detector 8a which detects the acid electrical conductivity of the sampled water at least. The 2nd detection part 9 is comprised by the detector 9a which detects the acid electrical conductivity of the sampled vapor | steam at least. Further, the first detection unit 8 and the second detection unit 9 are provided with a cation exchange resin. By providing a cation exchange resin and detecting the acid electrical conductivity, the first detection unit 8 and the second detection unit 9 detect cations with high sensitivity. When water obtained from chemicals (for example, ammonia or hydrazine), water containing leaked seawater, or steam containing carryover substances is passed through a cation exchange resin such as a hydrogen ion type strongly acidic cation exchange resin, Cations such as Na ⁺ , Ca ²⁺ , NH ₄ ⁺ , N ₂ H ₅ ^+, etc. contained in are replaced with H ⁺ . H ⁺ has a higher ultimate molar conductivity than Na ⁺ , Ca ²⁺ , NH ₄ ⁺ , N ₂ H ₅ ^+, etc., so it is difficult to detect leaked seawater or carryover substances. By passing a strongly acidic cation resin, the detection sensitivity is amplified, and detection can be performed with high sensitivity.

  However, if ions can be detected with high sensitivity without detecting acid electrical conductivity, the first detection unit 8 and the second detection unit 9 do not have to be provided with a cation exchange resin.

  The first detection unit 8 outputs the detection value D1 to the processing unit 10, and the second detection unit 9 outputs the detection value D2 to the processing unit 10. The first detection unit 8 transmits the detection value D1 as a signal correlated with the detection value D1, and the second detection unit 9 transmits the detection value D2 as a signal correlated with the detection value D2. These signals may be signals of any communication form such as electric signals, optical signals, radio signals, and the like, as long as they transmit signals correlated with the detection value D1 and the detection value D2. Any method may be used.

  As illustrated in FIG. 2, the processing unit 10 includes an input unit 101 that receives a detection value of acid electrical conductivity of water and a detection value of acid conductivity of steam, and a detection value D <b> 1 and detection detected by the input unit 101. The comparison unit 102 compares the value D2, the determination unit 103 that determines the comparison result of the comparison unit 102, and the output unit 104 that outputs the comparison result of the comparison unit 102 and the determination result of the determination unit 103. Further, the processing unit 10 performs processing as shown in FIG.

  The processing unit 10 includes a computer system having a CPU, a storage unit, an I / O unit, and the like, and includes an input unit 101, a comparison unit 102, a determination unit 103, and an output unit 104. Each process is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing the program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

  In addition, the processing unit 10 may individually configure the input unit 101, the comparison unit 102, the determination unit 103, and the output unit 104 with an electric circuit or an electronic circuit, respectively.

  In the steam turbine equipment of this embodiment, as shown in FIG. 1, the steam generated in the boiler 3 is supplied to the steam turbine 2 via the steam line 7. The steam is used to drive the steam turbine 2 and then cooled by seawater or the like flowing through the cooling pipe in the condenser 4 to be returned to water (condensate). The water in the condenser 4 is sent to the boiler 3 by the condensate pump 5 via the water supply line 6. The water sent to the boiler 3 is converted again into steam and supplied to the steam turbine 2. Thus, a circulation system is formed as a whole by the flow of steam and water.

Here, carry over to the steam turbine side will be described.
The boiler 3 obtains steam by heating the water sent from the water supply line 6. The steam turbine equipment supplies steam to the steam turbine 2 through the steam line 7. Here, even if the seawater and chemicals leaked in the water sent from the water supply line 6 are contained, that is, if the electrolyte is contained, the steam obtained by boiling the water usually contains moisture (H ₂ O ) Is basically included. However, due to an increase in the water level of the drum in the boiler 3, deterioration of the demister, and excessive concentration of the electrolyte in the drum, water droplets and mist containing the electrolyte in the boiler 3 accompany the steam flowing into the steam line 7, and the steam turbine The electrolyte may be mixed into the second side, and electrolyte carry-over may occur.

  The material carried over from the water supply system A to the steam system B includes a substance that causes corrosion and scale of the steam turbine. Therefore, it is necessary to monitor not only the water quality of the water supply system A but also the carry-over substance that can be contained in the steam of the steam system B.

  Hereinafter, the processing of the processing unit 10 of the present embodiment will be described with reference to the flowchart of FIG.

  When the processing unit 10 starts processing (S1), the input unit 101 receives detection values D1 and D2 as signals from the first detection unit 8 and the second detection unit 9 (S2: input step). Here, the first detection unit 8 detects the acid electrical conductivity of water as the detection value D1 (first detection step), and the second detection unit 9 detects the acid electrical conductivity of the steam as the detection value D2 (first detection step). Two detection steps). The input unit 101 outputs the detection values D1 and D2 to the comparison unit 102. In FIG. 2, the input unit 101 individually transmits a signal related to the received detection value D1 and a signal related to the detection value D2 to the comparison unit 102. If the comparison unit 102 can separate the signals after transmission, the detection values D1 and D2 are transmitted. May be transmitted as a batch signal.

  The comparison unit 102 receives the detection values D1 and D2 from the input unit 101, performs an operation for comparing the detection value D1 and the detection value D2, and obtains a comparison result. The comparison unit 102 may perform any calculation as long as it obtains a comparison result between the detection value D1 and the detection value D2.

Here, the operation and effect of the comparison unit 102 will be described.
During operation of the steam turbine equipment, the condenser 4 is kept in a vacuum, but when the operation is stopped by inspection of the steam turbine equipment, the condenser 4 is not kept in a vacuum due to vacuum breakage. Become. For this reason, carbon dioxide contained in the air is mixed into the condensate of the condenser 4 and the water of the water supply line 6. In detecting the acid electrical conductivity, if carbon dioxide in the air is mixed into the steam or water of the circulation system, the acid electrical conductivity of the steam or water increases due to the influence of carbonate ions. Even if acid conductivity is detected by passing through a cation exchange resin, if carbon dioxide in the air is contained in water or steam, as explained in the background section, the carbon dioxide component is , It will pass through the cation exchange resin, affecting the detection of acid conductivity.

  Unlike the electrolyte which is the monitoring target of the acid electrical conductivity, the carbon dioxide component does not cause scale and corrosive substances in the steam turbine 2 and does not leak seawater, so monitoring is unnecessary. However, the carbon dioxide component affects the detection of acid electrical conductivity, so when carbon dioxide is mixed, the acid electrical conductivity of the electrolyte of the substance that causes scale and corrosive substances and the acid electrical conductivity of leaked seawater Cannot be detected accurately.

Therefore, the comparison unit 102 compares the detection value D1 of the acid electrical conductivity of water with the detection value D2 of the acid conductivity of the steam (S3: comparison step).
Carbon dioxide mixed in steam or water does not adhere to the steam turbine 2, circulation system piping or equipment like scales or corrosive substances, or accumulate in the boiler like seawater or chemicals. In other words, the carbon dioxide mixed in the steam and water circulates with the water and steam through the steam turbine equipment while maintaining the amount of water and steam mixed. Accordingly, the circulating carbon dioxide gas is detected to the same extent by both the first detection unit 8 and the second detection unit 9.

  On the contrary, the electrolyte dissolved in the seawater mixed in the water of the water supply system A is mixed in the boiler 3 but is not detected in the steam system B because it does not evaporate in the boiler 3. Further, among the electrolytes that have carried over to the steam system B, substances that form scales and corrosion on the steam turbine 2 adhere to the steam turbine 2 and form scales and corrosive substances. Decrease. A substance that forms scale or corrosion in the steam turbine 2 is detected at a lower level in the water supply system A than in the steam system B.

  Therefore, when seawater is mixed into the water supply system A, or when a substance that forms the scale or corrosive substance is mixed into the steam system B, the first detection unit 8 and the second detection unit 9 detect different values. Will be.

  Therefore, if the detected value D1 of the acid conductivity of water and the detected value D2 of the acid conductivity of the steam are compared, the acid conductivity detected by both the first detector 8 and the second detector 9 Among them, the acid electrical conductivity corresponding to the carbon dioxide gas can be canceled and evaluated, and the monitoring device 1 can perform the monitoring while reducing the influence of the carbon dioxide gas that does not require monitoring.

As the electrolyte to be dissolved in the ^seawater, Na ^+, Cl -, there is ^{Ca 2+} and the like, as the electrolyte to form scale and corrosion ^substances, Na ^+, Cl -, in addition to ^{Ca 2+,} there is _PO ^{4 3-} .

  Furthermore, when the influence of carbon dioxide gas is large, as a modification, the first detection unit 8 is configured by a detector 8a and a deaeration unit 8b, and the second detection unit 9 is configured by a detector 9a and a deaeration unit 9b. May be. Specifically, as shown in FIG. 4, by providing a deaeration unit 8b upstream of the detector 8a and a deaeration unit 9b upstream of the detector 9a, the first detection unit 8 and the second detection unit 9 are The pretreatment of degassing the carbon dioxide gas is performed. The monitoring apparatus 1 compares the detection value D1 obtained by performing this pre-processing with the detection value D2, thereby eliminating carbon dioxide that is not required for monitoring at the time of detection and the influence of carbon dioxide that could not be completely eliminated. Offset. And by providing the deaeration units 8b and 9b, it becomes possible to monitor in an environment with less noise, and the monitoring device 1 provided with the deaeration units 8b and 9b is compared with the case where the deaeration units 8b and 9b are not provided. A more subtle amount of electrolyte can be detected.

  Examples of operations that can evaluate the difference or ratio between the detection value D1 and the detection value D2 include not only the difference or ratio between the detection value D1 and the detection value D2, but also the square root of the square of the difference between the detection value D1 and the detection value D2. The absolute value of the difference between the detection value D1 and the detection value D2, the square of the ratio between the detection value D1 and the detection value D2, the square root of the ratio between the detection value D1 and the detection value D2, and the like can be considered. That is, any calculation may be used as long as it obtains a comparison result that can evaluate the difference or ratio between the detection values D1 and D2.

  As an example, the following formula (1) shows an operation for calculating the square root of the square of the difference between the detected value D1 and the detected value D2.

M = √ ((D1-D2) ² ) (1)

  The comparison unit 102 performs the calculation and outputs the calculation result as a monitoring value M (comparison result) to the determination unit 103 or the output unit 104 (FIG. 2).

  The determination unit 103 determines whether the comparison result is abnormal (S4: determination step). For example, the determination is made by comparing the monitoring value M with the threshold value M1, for example. The determination of whether or not there is an abnormality may use any of the above-described calculations, but if the calculation result of Expression (1) is used, the abnormality can be reliably determined with relatively simple calculations and determinations. By making this determination, it is possible to make an abnormality determination quickly and accurately without waiting for the evaluation of the supervisor.

  If it is determined that there is no abnormality (NO) as a result of the determination as to whether there is an abnormality, the determination unit 103 receives the next detection value D1 and the detection value D2. If the determination unit 103 determines that the result is abnormal (YES), the output unit 104 outputs an abnormality (S6), and the processing unit 10 ends the process (S7). Abnormal output can be monitored in real time or later, such as output to display media such as display devices and recording paper, output to storage devices, output to alarm devices such as warning lights and alarm sounds, etc. Anything is acceptable.

"Second embodiment"
A second embodiment of the monitoring apparatus for steam turbine equipment according to the present invention will be described with reference to the flowchart of FIG.

  The monitoring device 1 of the present embodiment is the same as the device configuration of the first embodiment except that the processing of the determination unit 103 of the first embodiment is different.

In the present embodiment, when the processing unit 10 starts processing (S1), the same processing as in the first embodiment is performed until the comparison step (S3).
However, in the present embodiment, the comparison unit 102 calculates a parameter that can evaluate the magnitude relationship between the detection value D1 and the detection value D2 as the monitoring value M. As parameters for evaluating the magnitude relationship, the difference between the detection value D1 and the detection value D2 (M = (D1−D2)), the ratio of the detection value D1 to the detection value D2 (M = D1 / D2), the detection value D1 and There are the square of the ratio between the detection value D2 and the square root of the ratio between the detection value D1 and the detection value D2.

  In S4: determination process, the determination unit first determines whether or not the comparison result is abnormal (S4-1: first determination process), as in the first embodiment. Subsequently, the magnitude relationship between the detection value D1 and the detection value D2 is determined (S4-2: second determination step).

  In the following determination of the magnitude relationship, when the detected value D1 and the detected value D2 are not in a magnitude relationship, that is, when the detected value D1 and the detected value D2 are substantially equal, either the water supply system A or the steam system B An abnormality may be determined, or it may be determined that there is no abnormality. In the following, a case where the detection value D1 and the detection value D2 are not equal will be described in order to simplify the description.

  If the detection value D1 and the detection value D2 are adjusted to show the same value for the same acid electrical conductivity, if the detection value D1 is larger than the detection value D2, the cause of the increase in the acid electrical conductivity is It means that it is in the water supply system A, and when the detected value D2 is larger than the detected value D1, it means that the cause of the increase in the acid electrical conductivity is in the steam system B.

  Therefore, if the magnitude relationship is determined and it is determined that the detected value D1 is greater than the detected value D2 (YES), it is determined that the water supply system A is abnormal, and the detected value D1 is not greater than the detected value D2 (NO). Is determined as an abnormality in the steam system B, the output unit 104 outputs a determination result (S5: output step), and the process ends (S6).

  The determination of the magnitude relationship in the determination unit 103 has various forms. For example, if the comparison unit 102 calculates M = D1-D2, the determination unit 103 determines whether the monitoring value M is positive or negative. If the detected value D1 and the detected value D2 are adjusted so as to show the same value for the same acid electrical conductivity, if the monitored value M is positive, the acid electrical conductivity of the water in the water supply system A is It will be higher than the acid electrical conductivity of the steam system B. Therefore, when the monitoring value M is positive, the determination unit 103 determines that seawater is leaking. Conversely, when the monitoring value M is negative, the determination unit 103 determines that the carry-over substance is mixed in the vapor.

  As a modification, if the comparison unit 102 calculates M = D1 / D2, the determination unit 103 determines whether the monitoring value M is larger or smaller than 1. If the detected value D1 and the detected value D2 are adjusted so as to show the same value for the same acid electrical conductivity, when the monitored value M is larger than 1 (when D1> D2), the water supply system A The acid electrical conductivity of water is higher than that of the steam system B. Therefore, when the monitoring value M is greater than 1, the determination unit 103 determines that seawater is leaking. On the other hand, when the monitoring value M is smaller than 1, the determination unit 103 determines that the carry-over substance is mixed in the vapor.

  In this embodiment, the determination unit 103 determines the magnitude relationship after determining whether or not the abnormality is present, but as a modification, the determination unit 103 may determine the magnitude relationship before determining whether or not the abnormality is present. When determining the magnitude relationship before the determination as to whether or not it is abnormal, the determination unit 103 performs processing according to the flowchart of FIG. In the flowchart of FIG. 6, after determining the magnitude relationship between the detected value D1 and the detected value D2 (S4-1 ′: first determination step), it is determined whether the comparison result is abnormal (S4-2 ′: The first determination step) is performed.

  In the present embodiment, the magnitude relationship is determined before or after the determination as to whether or not the abnormality is present (the magnitude relationship is determined in series with respect to the determination as to whether or not the abnormality is present). In addition to the determination unit 103, a determination unit 103 ′ that determines the magnitude relationship may be provided in the processing unit 10, and the magnitude relationship may be determined in parallel with the determination as to whether the abnormality is present.

  In addition, when the monitor determines leakage of seawater or mixing of steam, the determination unit 103 is not provided in the processing unit 10 or the determination unit 103 is provided, and the comparison unit 102 directly inputs the monitoring value M to the output unit 104. It is configured to transmit (FIG. 2). The output unit 104 directly outputs information based on the monitoring value M. The output of the output unit 104 is not limited to the direct output of the monitoring value M, but any output that allows the monitoring person to evaluate the monitoring value M, such as a table in which the monitoring values M are arranged or a graph of temporal changes of the monitoring values M. It may be anything.

  For example, if the output unit 104 displays the output on a display medium such as a display unit or recording paper, the monitor can determine whether seawater has leaked or steam has been mixed. It can support manual judgment and delicate judgment. Further, by using the output unit 104, the determination unit 103 can be eliminated and the processing unit 10 can be simplified. Alternatively, the output unit 104 outputs information based on the monitoring value M together with the determination result of the determination unit 103, so that the monitor can perform double monitoring.

7 and 8 show actual monitoring results.
The upper graphs in FIGS. 7 and 8 are waveforms showing the output (electric power) of the steam turbine 2, and show the output state when the turbine equipment is stopped during the operation and then restarted. 7 and 8 are waveforms of the detection value D1 (dotted line) and the detection value D2 (solid line), and are shown in synchronization with the output waveform of the steam turbine 2. The lower graphs of FIGS. 7 and 8 are waveforms of the monitoring value M calculated from the detection value D1 and the detection value D2, and are shown in synchronization with the output waveform of the steam turbine 2. M1 indicates a threshold value for determining an abnormality of the monitoring value M.

  In FIG. 7, since there is no abnormality in the water supply system A and the steam system B until immediately after the restart of the turbine equipment (the output of the steam turbine 2 is increased), monitoring is performed except when the output of the steam turbine 2 is decreased X1 and when the output is increased X2. There is no change in the value M.

  Here, the change in the monitoring value M when the output of the steam turbine 2 is increased and when the output is decreased is that the air in the condenser 4 is degassed and the water supply line 6 is changed when the turbine equipment is stopped and when the output fluctuates including when it starts. This is due to the characteristics of the steam turbine equipment such as the time lag of the time change of the carbon dioxide gas and the residue accompanying the switching of the steam line 7, and is not due to the leakage of seawater or the mixing of steam. Therefore, during a certain period (X1, X2) when the output fluctuates including when the steam turbine equipment is started or shut off, the output fluctuation such as when the output of the steam turbine 2 is increased and when the output is decreased by masking the monitoring value M. It is possible to prevent a change in the monitoring value M from being detected as abnormal.

  The mask may be masked using a time determined in advance by the specifications and operation program of the steam turbine equipment, or may be used as a control signal or a response signal (completion signal) such as pump start or boiler start of the steam turbine equipment. It may be masked synchronously. Further, the mask may be a mask that detects a change in the output of the steam turbine 2 or an open / close signal of a valve of various systems and masks it using the mask time calculated from the detection.

  On the other hand, the graph of FIG. 7 shows a waveform when seawater leaks at a stage after a slight increase in the output of the steam turbine 2 (final time stage of the graph of FIG. 7). The monitored value M in the lower graph of FIG. 7 is a waveform calculated by the square root of the difference between the detected value D1 and the detected value D2 (equation (1)). Due to the leakage of seawater, the acid electrical conductivity of the steam in the steam system B hardly changes, whereas the acid electrical conductivity of the water in the water supply system A changes and becomes high. And while the detection value D2 hardly changes, the detection value D1 changes and becomes high. As a result, the value of the monitoring value M changes and becomes higher due to the change of the detection value D1. The change in the monitoring value M is determined by the threshold value M1 and detected as an abnormality.

  A modification is shown in the graph of FIG. The graph of FIG. 8 shows a waveform when a carry-over has occurred at a stage after a slight increase in the output of the turbine equipment (final time stage of the graph of FIG. 8). The monitored value M in the lower graph of FIG. 8 is a waveform of a value obtained by subtracting the detected value D2 from the detected value D1 (monitored value M = D1-D2). While the acid electrical conductivity of water hardly changes, the acid electrical conductivity of the steam changes and becomes high when the carry-over substance is mixed into the steam. The detection value D1 hardly changes, whereas the detection value D2 changes and becomes high, and the change of the detection value D2 also changes the value of the monitoring value M and becomes low. The change in the monitoring value M is determined by the threshold values M1 and M2, and is detected as an abnormality.

  Furthermore, in the example of FIG. 8, the sign of the monitoring value M is determined. In the case of the waveform in FIG. 8, the monitoring value M indicates a negative value at the time when the abnormality is detected. Therefore, this abnormality is determined as an abnormality in the steam system B.

  The above-described monitoring device for water and steam acid electrical conductivity of steam turbine equipment can be applied not only to thermal power plants, but also to nuclear power plants, geothermal power plants, and the like. Furthermore, the present invention is not limited to a power plant, and any application is possible as long as it uses steam turbine equipment such as a pump or a ship.

1: monitoring device, 2: steam turbine, 3: boiler, 4: condenser, 5: condensate pump, 6: water supply line, 7: steam line, A: water supply system, B: steam system, 8: first Detection unit, 8a: detector, 8b: deaeration unit, 9: second detection unit, 9a: detector, 9b: deaeration unit, 10: processing unit, 101: input unit, 102: comparison unit, 103: determination Part, 103 ′: determination part, 104: output part

Claims (15)

A steam turbine driven by steam; a steam system including a steam generating steam and a steam line supplying steam from the boiler to the steam turbine; and a condenser and water for returning the exhaust of the steam turbine to water. A steam turbine facility monitoring device having a water supply system including a water supply line for supplying water from the water tank to the boiler,
An input unit for receiving the detected value of the electrical conductivity of the water and the detected value of the electrical conductivity of the vapor;
A comparison unit for comparing the detected value of the electrical conductivity of the water received by the input unit with the detected value of the electrical conductivity of the steam;
An output unit that outputs information based on a comparison result of the comparison unit. A monitoring apparatus for steam turbine equipment, comprising: In the steam turbine equipment monitoring device according to claim 1,
A determination unit for determining an abnormality of the water supply system or the steam system from a comparison result of the comparison unit;
The said output part outputs the determination result in the said determination part as information. The monitoring apparatus of the steam turbine equipment characterized by the above-mentioned. In the monitoring device of the steam turbine equipment according to claim 1 or 2,
The comparison unit obtains the square root of the difference between the detected value of the electric conductivity of the water and the detected value of the electric conductivity of the steam or the absolute value of the difference as a comparison result. Monitoring device. In the monitoring apparatus of the steam turbine equipment as described in any one of Claims 1-3,
The said comparison part calculates | requires the parameter which shows the magnitude relationship between the detected value of the electrical conductivity of the said water, and the detected value of the electrical conductivity of the steam as a comparison result. The monitoring apparatus of the steam turbine equipment characterized by the above-mentioned. In the monitoring apparatus of the steam turbine equipment according to claim 4,
The said parameter is the difference or ratio of the detected value of the electrical conductivity of the said water, and the detected value of the electrical conductivity of the said steam. The monitoring apparatus of the steam turbine equipment characterized by the above-mentioned. In the monitoring apparatus of the steam turbine equipment according to claim 4 or 5,
When the detected value of the electrical conductivity of the water is larger than the detected value of the electrical conductivity of the steam, it is determined that the water supply system is abnormal, and the detected value of the electrical conductivity of the steam is detected as the electrical conductivity of the water. A steam turbine equipment monitoring apparatus, comprising: a determination unit that determines that the steam system is abnormal when the value is greater than the value. In the monitoring apparatus of the steam turbine equipment as described in any one of Claims 1-6,
The comparison result of the comparison part at the time of output fluctuation of the steam turbine equipment is masked. A steam turbine equipment monitoring device according to any one of claims 1 to 7,
A first detection unit for detecting a value of electrical conductivity of water in the water supply system;
A second detector for detecting a value of electrical conductivity of the steam in the steam system;
With
The input unit receives a detection value of the electrical conductivity of the water detected by the first detection unit and a detection value of the electrical conductivity of the vapor detected by the second detection unit. Monitoring equipment for steam turbine equipment. In the monitoring apparatus of the steam turbine equipment according to claim 8,
The first detection unit and the second detection unit each include a degassing unit for degassing carbon dioxide gas. The steam turbine equipment monitoring device according to any one of claims 1 to 9,
The steam turbine equipment comprising the steam turbine, the water supply system, and the steam system. A steam turbine driven by steam; a steam system including a steam generating steam and a steam line supplying steam from the boiler to the steam turbine; and a condenser and water for returning the exhaust of the steam turbine to water. A steam turbine facility monitoring method comprising a water supply system including a water supply line for supplying water from a water supply to the boiler,
A first detection step of detecting a value of electrical conductivity of water in the water supply system;
A second detection step for detecting a value of electrical conductivity of the steam in the steam system;
An input step for receiving the detected value of the electrical conductivity of the water detected in the first detection step and the detected value of the electrical conductivity of the vapor detected in the second detection step;
A comparison step of comparing the detected value of the electrical conductivity of the water received in the input step with the detected value of the electrical conductivity of the steam;
An output step of outputting information based on a comparison result of the comparison step. A method for monitoring a steam turbine facility, comprising: In the steam turbine equipment monitoring method according to claim 11,
A determination step of determining an abnormality of the water supply system or the steam system from the comparison result of the comparison step,
In the output step, the determination result in the determination step is output as information. A method for monitoring steam turbine equipment, comprising: In the monitoring method of the steam turbine equipment according to claim 11 or 12,
In the comparison step, as a comparison result, the square root of the difference between the detected value of the electrical conductivity of the water and the detected value of the electrical conductivity of the steam or the absolute value of the difference is obtained. Monitoring method. In the monitoring method of the steam turbine equipment according to any one of claims 11 to 13,
In the comparison step, a parameter indicating a magnitude relationship between the detected value of the electrical conductivity of the water and the detected value of the electrical conductivity of the steam is obtained as a comparison result. In the monitoring method of the steam turbine equipment according to claim 14,
When the detected value of the electrical conductivity of the water is larger than the detected value of the electrical conductivity of the steam, it is determined that the water supply system is abnormal, and the detected value of the electrical conductivity of the steam is detected as the electrical conductivity of the water. A steam turbine equipment monitoring method, comprising: a determination step of determining that the steam system is abnormal when the value is larger.

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