KR101135168B1 - Method and system for inspecting creep and thinned damage in heat exchanger steam tube - Google Patents

Abstract

A method and system for monitoring creep and thinning damage of a tube is disclosed to prevent plant shutdown loss and spreading failure due to breakage of a high temperature heat exchange steam tube. According to the invention, (a) calculating the tube heat transfer amount and the cumulative heat transfer amount using the real-time operation information measured from the flow rate, pressure and temperature sensor disposed on the non-heating portion of the heat exchange steam tube, (b) heat exchange steam Measuring the thickness of the tube cumulative scale using the tube inner scale thickness and the operating time of the measurement in the field measurement data of the tube, (c) the heat transfer relation by referring to the information identified in the steps (a) and (b) Calculating the real-time tube temperature by (d), and (d) the real-time tube stress information calculated using the tube thickness and the operating time during the measurement in the field measurement data of the heat exchange steam tube and the tube temperature calculated in the step (c). A method is provided that includes using information to calculate a real time tube damage rate and a cumulative damage rate.

According to this, by accurately measuring the damage of the tube to prevent the plant stop loss and spreading failure in advance, the effect of greatly reducing the power generation loss cost is achieved.

Industrial boilers, steam tubes, creep, thinning, damage rates, heat transfer

Description

METHODS AND SYSTEM FOR INSPECTING CREEP AND THINNED DAMAGE IN HEAT EXCHANGER STEAM TUBE}

The present invention relates to a method and system for monitoring creep and thinning damage of a heat exchange steam tube, and more particularly, to prevent plant stop loss and spread failure due to breakage of a high temperature heat exchange steam tube used in an industrial boiler or the like. It relates to a method and a system for monitoring the creep and thinning damage of the tube.

In general, a boiler is a device for generating steam necessary for power generation or industrial use. The main body and circulation system where steam is generated, a combustion device for burning fuel, a ventilation device for supplying combustion air and releasing combustion gas, and other air preheaters And an auxiliary device. There are various types of boilers from high temperature and high pressure power generation boilers such as drum type, perfusion type (subcritical or supercritical pressure), fluidized bed boilers to industrial boilers, and various fossil fuels such as coal and oil. Use In this case, the industrial boiler generally causes a lot of damage to the tube, and typical damage of the tube corresponds to creep damage due to long time high temperature operation and thinning damage of the tube thickness due to erosion and corrosion. In general, the inner scale of the tube is caused by oxidation between the steam flowing through the tube and the material of the tube, and the thickness grows in proportion to the operating time and the operating temperature of the tube. The amount of heat transfer decreases and the operating temperature of the tube increases, accelerating the creep damage of the tube.

The integrity of the tube is evaluated against such damage to the tube. First, the integrity evaluation is performed by firstly installing a thermocouple directly on the tube surface of the heating part to measure the temperature of the tube, or secondly, on the surface of the non-heating tube. By installing the temperature of the steam can be checked whether the tube is overheated. The former is an evaluation method that is rarely used due to the difficulty of installation and durability, and the latter is widely used due to the ease of installation and good durability, but it is difficult to predict the degree of overheating of the actual tube, thereby damaging the tube. It has been pointed out that a small disadvantage contributes to the prevention of failures such as cracking and rupture.

In other words, the operating environment of the heating tube where the temperature sensor is installed is not easy to install the sensor due to the expansion or contraction of the tube during start-up due to the harsh environment that must be in direct contact with the high temperature fluid of 600 ~ 1000 ℃. Even if the sensor is installed, the durability of the temperature sensor is not guaranteed, and if the temperature sensor is dropped during operation, the breakage and failure of components and facilities installed downstream of the hot gas are frequently occurred.

The present invention is to solve the conventional problems as described above, based on the data measured on the flow rate, pressure and temperature sensors disposed on the non-heated portion of the heat exchange steam tube and the field measurement data finally the real-time tube damage rate and Heat exchange steam tubes that reduce power loss costs due to unplanned outages by performing cumulative inspections on weaker tubes and replacing tubes before accidents, by calculating cumulative damage rates to more specifically distinguish the health of locally different tubes. It is an object of the present invention to provide a method and system for monitoring creep and thinning damage.

In order to accomplish the objects of the present invention as described above and to carry out the characteristic functions of the present invention described below, features of the present invention are as follows.

According to one aspect of the present invention, a method for monitoring creep and thinning damage of a heat exchange steam tube, comprising: (a) using real-time operation information measured from a flow rate, pressure, and temperature sensor disposed on an unheated portion of a heat exchange steam tube; Calculating the tube heat transfer amount and the cumulative heat transfer amount, (b) measuring the thickness of the tube cumulative scale using the tube inner scale thickness and the operating time at the time of the field measurement data of the heat exchange steam tube, and (c) Calculating the real-time tube temperature by the heat transfer relation with reference to the information identified in the steps (a) and (b) and (d) using the tube thickness and the operating time of the measurement in the field measurement data of the heat exchange steam tube The real-time tube damage rate and the cumulative damage rate are calculated using the calculated real-time tube stress information and the tube temperature information calculated in step (c). The method is provided comprising a.

In addition, according to another aspect of the present invention, a system for monitoring the creep and thinning damage of the heat exchange steam tube, digital real-time operation information collected by the flow rate, pressure and temperature sensor disposed in the non-heated portion of the heat exchange steam tube Signal conversion device to convert the signal, tube heat measurement during the stop of the heat exchange steam tube and tube internal oxidation scale thickness, and tube heating using operation information including tube non-heating part temperature, steam flow rate, operating pressure and operating time during operation Tube damage analysis device for predicting and monitoring in real time the damage caused by creep and thinning of the tube heating portion without installing a temperature sensor in the unit, and displays the real-time cumulative damage rate information calculated by the tube damage analysis device for the monitor to see A system is provided that includes a surveillance computer.

Here, the tube damage analysis device, the heat transfer amount calculation unit for calculating the tube heat transfer amount and the cumulative heat transfer amount using the real-time operation information measured from the flow rate, pressure and temperature sensor disposed on the non-heating portion of the heat exchange steam tube, heat exchange In the field measurement data of the steam tube, the scale thickness measuring unit for measuring the thickness of the tube accumulated scale using the inner tube scale thickness and the operating time at the measurement, and the information obtained from the heat transfer amount calculation unit and the scale thickness measuring unit The tube temperature calculation unit calculates the real-time tube temperature by the heat transfer relation, and the real-time tube stress information calculated using the tube thickness and the operating time during the measurement of the field measurement data of the heat exchange steam tube and the tube temperature calculation unit. Calculate real-time tube damage and cumulative damage rates using tube temperature information It is configured to include sangyul calculation part is preferred.

According to the present invention, by accurately measuring the damage of the tube in the above configuration to prevent the plant stop loss and spreading failure in advance, the effect of greatly reducing the power generation loss cost is achieved.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It is to be understood that the various embodiments of the invention are different, but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein may be embodied in other embodiments without departing from the spirit and scope of the invention with respect to one embodiment. In addition, it is to be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention, if properly described, is defined only by the appended claims, along with the full range of equivalents to which such claims are entitled. Like reference numerals in the drawings refer to the same or similar functions throughout the several aspects.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention.

Example of tube damage monitoring system 100

1 is a configuration diagram showing an example tube damage monitoring system 100 according to an embodiment of the present invention.

As shown in FIG. 1, the tube damage monitoring system 100 according to an embodiment of the present invention includes a heat exchange steam tube 110, a signal conversion device 120, a tube damage analysis device 130, and a monitoring computer 140. It is configured to include).

First, the heat exchange steam tube 110 will be described. In the heat exchange steam tube 110 of the present invention, a plurality of tube row bundles 117 disposed in the gas advancing direction between the signal transmission lines 116 are provided for the gas flow of high temperature fluid. When arranged in a direction perpendicular to the direction, the flow rate (F, 111), the temperature (T, 112) and the pressure (P, 113) sensor for the operation control is installed in the unheated portion of the heating unit enclosure (110A), Temperature and pressure sensors 112 and 113 are disposed corresponding to three to five tube bundles 117 among the dozens of tube bundles. On the other hand, the flow rate sensor 111 is disposed only at one place of the bar heating unit to measure the total steam flow rate, not per tube or tube bundle 117 steam flow rate. In this case, in the present embodiment, the same or reduced sized tube and header or pipe connection model may be manufactured, and the flow rate of each tube may be measured through experiments, or the flow rate of each tube may be predicted by computerized analysis. The flow rate of each tube has the property of maintaining a constant ratio even if the total flow rate changes with respect to the average flow rate. Therefore, when the flow rate is measured or predicted during the normal operation of the heat exchanger through experiment or computational analysis, the flow rate ratio is calculated by dividing it by the average flow rate, which is called the flow rate unbalance coefficient.

As such, if the flow rate imbalance coefficient of each tube is known, heat absorption of some tubes can be calculated through the installed temperature and pressure sensor, and the calculated heat absorption is interpolated for the tube without the temperature and pressure sensor. It can be used in a procedure for predicting damage of a tube, which will be described later.

As a result, the signal conversion device 120 of the present invention is not only the steam flow rate information by the flow rate sensor 111 disposed on the non-heating portion of the heat exchange steam tube 110, but also the temperature and pressure sensor 112, 113 It performs the function of collecting the operation information including the inlet and outlet temperature of the steam tube, the inlet and outlet pressure of the tube and the operating time information in real time and converting it into a digital signal.

The tube damage analysis device 130 of the present invention uses the operation information including the tube thickness and the thickness of the inner surface oxidation scale during the stop of the heat exchange steam tube and the tube non-heating unit temperature, the steam flow rate, the operating pressure and the operating time during the operation. Thus, the function of predicting and monitoring the damage caused by creep and thinning of the tube heating part in real time without installing a temperature sensor in the tube heating part. This tube damage analysis device 130 will be described later with reference to FIG.

The monitoring computer 140 of the present invention performs a function of displaying the real-time cumulative damage rate information calculated by the tube damage analyzing apparatus so that the monitor can see it.

Example of tube damage analyzer 130

2 is a block diagram showing an example tube damage analysis device 130 according to an embodiment of the present invention.

As shown in FIG. 2, the tube damage analyzer 130 according to an embodiment of the present invention includes a heat transfer amount calculator 131, a scale thickness measurer 132, a tube temperature calculator 133, and a damage rate. The calculator 134 includes a communication unit 135 and a control unit 136.

First, the heat transfer amount calculation unit 131 of the present invention uses tube heat by using real-time operation information measured from flow rates, pressures, and temperature sensors 111, 112, and 113 disposed on the non-heating unit of the heat exchange steam tube 117. Calculate the amount of transfer and the cumulative heat transfer. Here, the real-time operation information is the tube shape as well as the inlet and outlet temperature of the steam tube, the inlet and outlet pressure of the tube, steam flow rate and operation time information through the flow rate, pressure and temperature sensor (111, 112, 113) And it can be understood as a broad concept including information that can be measured during operation, such as heat transfer characteristics of the material, temperature distribution characteristics of the hot fluid.

More specifically, the heat transfer amount calculation unit 131 according to the present invention considers the temperature distribution characteristic information of the high temperature fluid in the statistic information and the operation information measured by the sensor, and uses the local real-time heat transfer amount by one-dimensional finite element analysis. After distribution, the local cumulative heat transfer amount can be calculated as a result of the sum of the local real-time heat transfer amounts over time.

Compared with the conventional method, the thickness of the inner scale of the tube is expressed as a function of the tube operating temperature and the operating time. When the operating temperature history and the operating time of the tube are known, the thickness of the inner scale of the tube is estimated. In order to express it as a function of and operating time, we tried to measure the thickness of the inner surface of the tube by maintaining the same operating temperature for a certain time for each operating temperature of the tube.However, unlike a laboratory that can intentionally control operating variables, Since the actual operating temperature of the tube could not be kept constant or measured, it was not possible to represent the thickness of the scale inside the tube as a function of operating temperature and operating time.

In order to overcome this disadvantage, the heat transfer amount calculation unit 131 of the present invention can calculate the scale thickness as a function of the cumulative heat transfer that includes both the operating temperature and the operating time characteristics without representing the scale thickness as a function of the operating temperature and the operating time. By overcoming the disadvantages of the prior art.

Next, the scale thickness measuring unit 132 of the present invention receives the field measurement data that can be measured in the field of the heat exchange steam tube 110 separately, using the scale thickness of the inner surface of the tube and the operating time at the time of measurement. It is to measure the thickness of the tube accumulation scale. In this case, the field measurement data is information on the properties of the tube, and the tube nominal outside diameter, tube design thickness, tube length and material heat transfer characteristics, and temperature distribution leading characteristics of the hot fluid according to the tube shape and material are measured in the field. .

Next, the tube temperature calculation unit 133 of the present invention is the information grasped by the heat transfer amount calculation unit 131 and the scale thickness measurement unit 132 described above, for example, the shape and thickness of the tube, heat transfer characteristics and cumulative heat transfer amount. In addition, the function of calculating the real-time tube temperature by the heat transfer relation with reference to the thickness information of the scale. Here, the heat transfer relation used to calculate the real-time tube temperature is composed of the convective heat transfer relation for incompressible turbulent flow inside the tube and conduction heat transfer formulas for the scale thin film and the tube tube to form a governing equation, and between the tube tube and the scale thin film. Existing contact heat resistance is calculated by incorporating the conduction heat transfer coefficient of the scale thin film, and the heat transfer relational calculation is used to estimate the average temperature of the tube from the known tube heat input, to calculate the creep damage of the tube, and to calculate the tube inner temperature. Calculate the scale of oxide growth on the inner surface of the tube. The heat input amount of the tube is calculated by using the temperature difference between the tube inlet and outlet obtained from the temperature sensor installed at the non-heating part of the tube inlet and outlet, the pressure difference obtained from the pressure sensor, and the flow rate imbalance coefficient obtained by the experiment and analysis and the flow rate information obtained from the flow sensor. do.

Next, the damage rate calculation unit 134 of the present invention performs a function of calculating the real-time tube stress using the tube thickness and the operating time at the time of the field measurement data of the heat exchange steam tube, and the calculated real-time tube stress By using the information and the tube temperature information calculated in the above-described tube temperature calculation unit 133 to perform the function of calculating the real-time tube damage rate and cumulative damage rate. At this time, the real-time tube stress can be obtained as a result of estimating the steam pressure inside the tube and the thinning rate per tube time by using the tube thickness and the operating time of the measurement in the field measurement data of the heat exchange steam tube.

Here, the thinning factors of the tube thickness include erosion by particulates in the combustion gas, abrasion by interference between the tubes, and corrosion by chemical reactions such as oxidation of the inner and outer surfaces of the tube. It is very difficult to predict tube thinning rate analytically because it is influenced by various environmental factors such as composition and fineness (solid fuel), moisture in combustion air, combustion state. Therefore, it is possible to predict the future thinning amount by extrapolating through linear or non-linear regression estimation based on the relationship between the operation time and the thickness thinning amount of the tube measured during the past stop inspection.

Next, the communication unit 135 of the present invention performs a function of the tube damage analysis device 130 transmits and receives various data such as the signal conversion device 120, the monitoring computer 140, and so on to interface with other devices. The control unit 136 of the present invention controls the flow of data between the heat transfer amount calculation unit 131, the scale thickness measurement unit 132, the tube temperature calculation unit 133, the damage rate calculation unit 134 and the communication unit 135. To perform.

Example of how to monitor tube damage

3 is a flowchart illustrating a method for monitoring tube damage by the tube damage analyzing apparatus 130 according to an embodiment of the present invention.

Tube damage monitoring method (S200) according to an embodiment of the present invention performs the function of monitoring the creep and thinning damage of the heat exchange steam tube through the process of step (a) to (k).

First, (a) step (S205) of the present invention using the field measurement equipment or flow rate, pressure and temperature sensor (111, 112, 113) tube nominal outside diameter, tube design thickness, tube length and thermal conductivity characteristics of the material and The process of measuring and collecting information on the heat transfer characteristics of the tube shape and material, including the hot fluid temperature distribution characteristics, and the fracture characteristics of the glyphs.

Subsequently, in step (b) of the present invention, tube inlet and outlet temperatures, tube inlet and outlet pressures, steam flow rates, and operating time information are referred to with reference to information related to heat transfer characteristics of the tube shape and material and fracture characteristics of the glyph. After separately collecting the real-time operation information, including (c) step (S215) it is possible to calculate the tube heat transfer amount and the cumulative heat transfer amount using the real-time operation information measured in (b) step (S210). Here, the local cumulative heat transfer is calculated by distributing the local real-time heat transfer amount by time by one-dimensional finite element analysis in consideration of the information measured by the sensor and the temperature distribution characteristic of the high temperature fluid. The result is.

Alternatively, in step (d) of the present invention, in order to estimate the cumulative scale thickness of the tube on the basis of information related to the heat transfer characteristics of the tube shape and material and the fracture characteristics of the glyph, the inner surface of the tube in the field measurement data of the heat exchange steam tube. The process of collecting scale thickness and measurement time separately.

As a result, in step (e) (S225) of the present invention, the calculated cumulative heat transfer information of step (c) (S215) and the scale thickness and measurement time of the collected inner tube surface of step (d) (S220) are used. The cumulative scale thickness due to the tube cumulative heat transfer amount can be estimated. Then, in step (f) (S230) of the present invention, it is possible to calculate the real-time tube temperature by the heat transfer relation with reference to the estimated result of (e) step (S225).

As another method, in step (235) of the present invention, the tube thickness and the operating time at the time of measuring the tube thickness among the field measurement data of the heat exchange steam tube based on the information related to the heat transfer characteristics of the tube shape and the material and the fracture characteristics of the gripping. Proceed with the collection process. Then, in step (h) (S240) of the present invention, it is possible to estimate the tube thinning rate by the collected information of step (g), and (i) step (S245) in real time by estimating the tube hourly thinning rate. The stress of the tube can be calculated.

Accordingly, in step (j) of the present invention, the real-time tube damage rate and the cumulative damage rate can be calculated using the information obtained by the steps (f) (S230) and (i) step (S245). will be. Then, in step (k) (S255) of the present invention it is possible to display the real-time tube damage rate and cumulative damage rate calculated in step (j) (S250) on the monitor computer.

4A and 4B are graphs showing the thickness diagram of the improved tube inner scale and the thickness diagram of the conventional tube inner scale, in FIG. 4A of the present invention as a function of cumulative heat transfer including both operating temperature and operating time characteristics. Although it is possible to simply calculate the thickness diagram of the scale, the conventional Figure 4b shows a complex scale thickness diagram as a function of the operating temperature and the operating time, it can be fully understood that there is a difference.

5 is a view showing a tube management task flow between the tube damage analysis device and maintenance work management device according to an embodiment of the present invention.

As shown in FIG. 5, the tube damage analyzing apparatus 130 according to an embodiment of the present invention has a tube cumulative heat transfer amount calculation, a thickness calculation of a tube inner surface cumulative scale, a tube temperature, a thickness, a stress calculation, and a tube within the tube. The result of calculating the damage rate is transmitted to the maintenance work management device 180. Therefore, the maintenance work management device 180 of the present invention refers to the data sent from the tube damage analysis device 130 to determine the degree of damage of the tube to establish an inspection plan, and to carry out the thickness reduction of the tube measured through the inspection. It is possible to update the information by measuring the increase in the thickness of the oxide scale inside the tube and to store the result in the tube inspection / measurement database 170. As such, the maintenance work management device 180 of the present invention uses the information provided from the tube damage analysis device 130 to determine the degree of damage, and to use this to establish the inspection, maintenance or replacement plan for the heat exchanger. Will be.

In addition, the tube damage analysis device 130 of the present invention can be linked to the real-time operation database 150, tube properties database 160 and the tube inspection / measurement database 170, the real-time operation database 150 described above It stores the driving information, the tube properties database 160 may store the tube properties information, such as the heat transfer characteristics of the tube shape and material and the fracture test data of the glyph. The result stored in the database is transmitted to the tube damage analyzer in response to the request of the tube damage analyzer 130.

1 is a configuration diagram showing an example tube damage monitoring system 100 according to an embodiment of the present invention.

2 is a block diagram showing an example tube damage analysis device 130 according to an embodiment of the present invention.

3 is a flowchart illustrating a method for monitoring tube damage by the tube damage analyzing apparatus 130 according to an embodiment of the present invention.

4A and 4B are graphs showing the thickness diagram of an improved tube inner scale and the thickness diagram of a conventional tube inner scale.

5 is a view showing a tube management task flow between the tube damage analysis device and maintenance work management device according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: tube damage monitoring system 110: heat exchange steam tube

120: signal conversion device 130: tube damage analysis device

131: heat transfer amount calculation unit 132: scale thickness measurement unit

133: tube temperature calculation unit 134: damage rate calculation unit

140: surveillance computer

Claims (10)

A method for monitoring creep and thinning damage of a heat exchange steam tube, (a) calculating a tube heat transfer amount and a cumulative heat transfer amount using real-time operation information measured from a flow rate, pressure and temperature sensor disposed on an unheated portion of a heat exchange steam tube, (b) measuring the thickness of the tube cumulative oxidation scale using the thickness of the inner surface oxidation scale and the operating time at the time of the field measurement data of the heat exchange steam tube; (c) calculating a real-time tube temperature by a heat transfer relation with reference to the information identified in steps (a) and (b), and (d) Real-time tube damage rate and cumulative damage by using real-time tube stress information calculated using the tube thickness and operating time during measurement in the field measurement data of the heat exchange steam tube and tube temperature information calculated in step (c). Step to calculate rate Including In step (a), In consideration of the information measured by the sensor and the temperature distribution characteristics of the high temperature fluid, the local real-time heat transfer amount is distributed by local real-time heat transfer amount by one-dimensional finite element analysis, and then the local cumulative heat transfer amount is calculated as a result of adding up the local real-time heat transfer amount by time. To do it, In step (c), Method of determining the real-time tube temperature as a result of estimating the amount of oxide scale growth on the inner surface of the tube by using the thickness of the inner surface of the heat exchange steam tube, the operation time at the time of measurement and the cumulative heat transfer amount. The method of claim 1, In step (a), Method for calculating the tube heat transfer amount and the cumulative heat transfer amount using the real-time operation information including the inlet and outlet temperature of the steam tube, the inlet and outlet pressure of the tube, steam flow rate and operating time information. delete delete The method of claim 1, The step (d) Method of determining the real-time tube stress as a result of estimating the vapor pressure inside the tube and the thinning rate per tube time by using the tube thickness and the operating time of the measurement in the field measurement data of the heat exchange steam tube. A system for monitoring creep and thinning damage of heat exchange steam tubes, Signal converting device for converting the real-time operation information collected by the flow rate, pressure and temperature sensor disposed in the non-heating portion of the heat exchange steam tube into a digital signal, Without measuring the thickness of the tube and the inner surface of the tube during the stop of the heat exchange steam tube and operating information including the tube unheated part temperature, steam flow rate, operating pressure and operating time, A tube damage analyzer for predicting and monitoring in real time damage caused by creep and thinning of the tube heating unit, and Surveillance computer for displaying the real-time cumulative damage rate information calculated by the tube damage analysis device for the monitor to see Including, The tube damage analysis device, A heat transfer calculation unit configured to calculate a tube heat transfer amount and a cumulative heat transfer amount by using real-time operation information measured from a flow rate, a pressure and a temperature sensor disposed on an unheated portion of a heat exchange steam tube, Scale thickness measurement unit for measuring the thickness of the cumulative oxidation scale of the tube by using the oxide scale thickness of the inner surface of the heat exchange steam tube and the operating time at the time of measurement, A tube temperature calculator for calculating a real-time tube temperature by a heat transfer relation with reference to the information grasped by the heat transfer amount calculator and the scale thickness measurer, and Real-time tube damage rate and cumulative damage rate are calculated by using real-time tube stress information calculated using tube thickness and operating time during measurement of heat exchange steam tube and tube temperature information calculated by the tube temperature calculator. Damage rate calculation part to do Including, The heat transfer amount calculation unit, In consideration of the information measured by the sensor and the temperature distribution characteristics of the high temperature fluid, the local real-time heat transfer amount is distributed by local real-time heat transfer by one-dimensional finite element analysis, and then the local cumulative heat transfer is calculated as a result of the sum of the local real-time heat transfer over time. To do it, The tube temperature calculation unit, A system for determining the real-time tube temperature based on the result of estimating the amount of oxide scale growth on the inner surface of the tube using the scale of the inner surface of the heat exchange steam tube and the operating time at the time of measurement and the accumulated heat transfer amount. delete The method of claim 6, The heat transfer amount calculation unit, The system uses real-time operation information including the inlet and outlet temperature of the steam tube, the inlet and outlet pressure of the tube, steam flow rate and operating time information. delete The method of claim 6, The damage rate calculation unit, A system that determines the real-time tube stress as a result of estimating the vapor pressure inside the tube and the thinning rate per tube time by using the tube thickness and the operating time of the measurement in the field measurement data of the heat exchange steam tube.

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