Heat transfer performance monitoring device and heat transfer performance monitoring method

Abstract

To provide a heat transfer performance monitoring device capable of long-term monitoring heat transfer performance of a gas-gas heater using a simple constitution.SOLUTION: A heat transfer performance monitoring device includes: a data acquisition section which acquires measured values of a vapor flow rate parameter related to a flow rate of vapor supplied to a heat medium heater; a data extraction section which extracts, from among the measured values of the vapor flow rate parameter acquired by the data acquisition section, a measured value in a period when an exhaust gas flow rate parameter related to a flow rate of exhaust gas of a boiler is equal to or higher than a predetermined planned value and when an exhaust gas temperature at the entrance of a heat recovery unit is equal to or higher than a predetermined planned temperature; and a time series data output section which outputs time series data related to the measured value of the vapor flow rate parameter extracted by the data extraction section.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a heat transfer performance monitoring device and a heat transfer performance monitoring method.

Background Art

[0002] Patent Document 1 describes a heating temperature adjustment method aimed at reducing heating by a steam-gas heater for maintaining a reference value of exhaust gas heating while maintaining the exhaust temperature of exhaust gas generated in power generation at a reference value. In this method, the temperature of the steam-gas heater that performs heating is adjusted to maintain the gas discharged from the chimney of the power plant at a predetermined temperature.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, a boiler plant may be provided with a gas-gas heater in order to prevent white smoke from flowing out of the chimney by setting the temperature of the exhaust gas at the inlet of the chimney to a predetermined temperature or higher. This gas-gas heater includes a heat recovery device configured to heat a heat medium by heat exchange between the exhaust gas of the boiler and the heat medium, and a reheater configured to heat the exhaust gas after passing through the wet desulfurization device using the heat medium heated by the heat recovery device.

[0005] By the way, since the heat transfer performance of the gas-gas heater deteriorates over time due to corrosion, wear, ash deposition, etc., it is desirable to monitor the heat transfer performance and perform maintenance such as repair at an appropriate time. However, if a large amount of data indicating the heat transfer performance is stored for a long time to monitor the change in the heat transfer performance over a long period, the memory capacity required for data storage becomes enormous, leading to a complicated configuration and high cost. In this regard, Patent Document 1 does not disclose any findings for monitoring the heat transfer performance of a gas-gas heater with a simple configuration over a long period.

[0006] In view of the above circumstances, at least one embodiment of the present disclosure aims to provide a heat transfer performance monitoring device and a heat transfer performance monitoring method capable of monitoring the heat transfer performance of a gas-gas heater over a long period with a simple configuration.

Means for Solving the Problems

[0007] To achieve the above object, a heat transfer performance monitoring device according to at least one embodiment of the present disclosure is a heat transfer performance monitoring device for monitoring the heat transfer performance of a gas-gas heater in a boiler plant, wherein the boiler plant includes a wet desulfurization device and a chimney provided downstream of the wet desulfurization device, and the gas-gas heater is a heat recovery device provided upstream of the wet desulfurization device and configured to heat the heat medium by heat exchange between the exhaust gas of the boiler and the heat medium, a reheater provided between the wet desulfurization device and the chimney in the flow direction of the exhaust gas and configured to heat the exhaust gas after passing through the wet desulfurization device using the heat medium heated by the heat recovery device, a high-temperature side heat medium line connecting the outlet of the heat medium in the heat recovery device and the inlet of the heat medium in the reheater, a low-temperature side heat medium line connecting the outlet of the heat medium in the reheater and the inlet of the heat medium in the heat recovery device, A heat medium heater provided in the high-temperature side heat medium line and configured to heat the heat medium in the high-temperature side heat medium line using steam; comprising The boiler plant includes a steam flow rate adjustment device that adjusts the flow rate of steam supplied to the heat medium heater so that the temperature of the exhaust gas at the inlet of the chimney is equal to or higher than a predetermined temperature. The heat transfer performance monitoring device includes a data acquisition unit configured to acquire a measured value of a steam flow rate parameter related to the flow rate of steam supplied to the heat medium heater; a data extraction unit configured to extract, from the measured values of the steam flow rate parameters acquired by the data acquisition unit, the measured values during a period in which an exhaust gas flow rate parameter related to the flow rate of the exhaust gas of the boiler is equal to or higher than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device is equal to or higher than a predetermined planned temperature; a time series data output unit configured to output time series data related to the measured values of the steam flow rate parameters extracted by the data extraction unit; and is provided with.

[0008] To achieve the above object, a heat transfer performance monitoring method according to at least one embodiment of the present disclosure is a heat transfer performance monitoring method for monitoring the heat transfer performance of a gas-gas heater in a boiler plant, The boiler plant includes a wet desulfurization device and a chimney provided downstream of the wet desulfurization device. The gas-gas heater is provided upstream of the wet desulfurization device and includes a heat recovery device configured to heat the heat medium by heat exchange between the exhaust gas of the boiler and the heat medium; a reheater provided between the wet desulfurization device and the chimney in the flow direction of the exhaust gas and configured to heat the exhaust gas after passing through the wet desulfurization device using the heat medium heated by the heat recovery device; a high-temperature side heat medium line connecting the outlet of the heat medium in the heat recovery device and the inlet of the heat medium in the reheater; A low-temperature side heat medium line connecting the outlet of the heat medium in the reheater and the inlet of the heat medium in the heat recovery unit, a heat medium heater provided in the high-temperature side heat medium line for heating the heat medium in the high-temperature side heat medium line using steam, and the boiler plant includes a steam flow rate adjustment device that adjusts the flow rate of steam supplied to the heat medium heater so that the temperature of the exhaust gas at the inlet of the chimney is equal to or higher than a predetermined temperature. The heat transfer performance monitoring method includes a data acquisition step of acquiring a measured value of a steam flow rate parameter related to the flow rate of steam supplied to the heat medium heater, a data extraction step of extracting, from the measured values of the steam flow rate parameters acquired in the data acquisition step, the measured values during a period in which an exhaust gas flow rate parameter related to the flow rate of the exhaust gas of the boiler is equal to or higher than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery unit is equal to or higher than a predetermined planned temperature, and a time-series data output step of outputting time-series data related to the measured values of the steam flow rate parameters extracted in the data extraction step. and

Advantages of the Invention

[0009] According to at least one embodiment of the present disclosure, there are provided a heat transfer performance monitoring device and a heat transfer performance monitoring method capable of monitoring the heat transfer performance of a gas-gas heater over a long period with a simple configuration.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0011] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the invention thereto, but are merely illustrative examples. For example, expressions representing relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" not only strictly represent such arrangements, but also represent states in which there are tolerances or relative displacements with angles or distances that can obtain the same function. For example, expressions representing that things such as "identical", "equal", and "homogeneous" are in an equal state not only strictly represent an equal state, but also represent states in which there are tolerances or differences that can obtain the same function. For example, expressions representing shapes such as a rectangular shape or a cylindrical shape not only represent shapes such as a rectangular shape or a cylindrical shape in a geometrically strict sense, but also represent shapes including concave and convex portions, chamfered portions, etc. within a range where the same effect can be obtained. On the other hand, the expressions "comprising", "having", "including", or "possessing" one component are not exclusive expressions that exclude the existence of other components.

[0012] FIG. 1 is a diagram showing a schematic configuration of a boiler plant 2 according to an embodiment. As shown in FIG. 1, the boiler plant 2 includes a boiler 4, a denitration device 5, an air preheater 6, a gas-gas heater (hereinafter referred to as "GGH") 8, a dust collector 10, an induced draft fan 12, a wet desulfurization device 14, a chimney 16, a flow meter 18, a flow meter 19, a thermometer 20, a thermometer 21, a thermometer 22, a thermometer 23, and a heat transfer performance monitoring device 24. The GGH 8 includes a heat recovery device 26 and a reheater 28, and each of the heat recovery device 26 and the reheater 28 is constituted by an indirect heat exchanger. The boiler 4 and the chimney 16 are connected by an exhaust gas line 29, and in the exhaust gas line 29, in the flow direction of the exhaust gas discharged from the boiler, a denitration device 5, an air preheater 6, a heat recovery device 26, a dust collector 10, an induced draft fan 12, a wet desulfurization device 14, and a reheater 28 are provided in order from the upstream side.

[0013] The exhaust gas (hereinafter simply referred to as "exhaust gas") discharged from the boiler 4 is cooled to, for example, 120 to 170°C by heat exchange in the air preheater 6 after nitrogen oxides are removed in the denitration device 5. The exhaust gas that has passed through the air preheater 6 is deprived of heat by a heat medium (for example, water) flowing through the heat transfer tubes constituting the heat recovery device 26 and cooled to, for example, 75 to 110°C, and then the dust in the exhaust gas is removed in the dust collector 10, and further pressurized by the induced draft fan 12, and then sulfur oxides are removed in the wet desulfurization device 14. Thus, the heat recovery device 26 is configured to heat the heat medium by indirect heat exchange through the heat transfer tubes between the exhaust gas of the boiler 4 and the heat medium.

[0014] The exhaust gas that has passed through the wet desulfurization device 14 usually has its temperature reduced to about 40 to 60 °C and is in a moisture-saturated state. If this exhaust gas is directly discharged from the chimney 16 into the atmosphere, white smoke will be generated. Therefore, it is heated above the dew point by the reheater 28 and then discharged from the chimney 16. Between the heat recovery device 26 and the reheater 28, a heat medium circulation line 30 composed of pipes is provided, and the heat medium circulation pump 32 circulates the heat medium between the heat recovery device 26 and the reheater 28 through the heat medium circulation line 30. Thus, the reheater 28 is configured to heat the exhaust gas after passing through the wet desulfurization device 14 to a temperature above the dew point (for example, the dew point of sulfuric acid) using the heat medium heated by the heat recovery device 26. The reheater 28 heats the exhaust gas by indirect heat exchange through the heat transfer pipes between the exhaust gas of the boiler 4 and the heat medium.

[0015] The heat medium circulation line 30 includes a high-temperature side heat medium line 34 that connects the outlet of the heat medium in the heat recovery device 26 and the inlet of the heat medium in the reheater 28, and a low-temperature side heat medium line 36 that connects the outlet of the heat medium in the reheater 28 and the inlet of the heat medium in the heat recovery device 26. The high-temperature side heat medium line 34 is provided with the above-mentioned heat medium circulation pump 32 and a heat medium heater 38 for heating the heat medium in the high-temperature side heat medium line 34 using steam. A steam supply line 40 and a steam drain line 42 are respectively connected to the heat medium heater 38. The steam supply line 40 is provided with a flow control valve 44 for adjusting the flow rate of the steam supplied from the steam supply line 40 to the heat medium heater 38 and a flow meter 19 for measuring the flow rate of the steam flowing through the steam supply line 40. The heat medium heater 38 is configured as an indirect heat exchanger that performs indirect heat exchange between the heat medium in the high-temperature side heat medium line 34 and the steam in the steam supply line 40 through heat transfer pipes and the like. The steam supplied from the steam supply line 40 to the heat medium heater 38 is used for heating the heat medium flowing through the high-temperature side heat medium line 34 in the heat medium heater 38 and then discharged as steam drain from the steam drain line 42.

[0016] The flowmeter 18 is provided in the exhaust gas line 29 and is configured to measure the flow rate of the exhaust gas flowing through the exhaust gas line 29 (exhaust gas flow rate parameter). The flow rate of the exhaust gas measured by the flowmeter 18 corresponds to the flow rate of the exhaust gas passing through the heat recovery device 26 and corresponds to the flow rate of the exhaust gas passing through the reheater 28.

[0017] The flowmeter 19 is provided in the steam supply line 40 and is configured to measure the flow rate of the steam supplied from the steam supply line 40 to the heat medium heater 38 (flow rate parameter).

[0018] The thermometer 20 is provided between the air preheater 6 and the heat recovery device 26 in the exhaust gas line 29 and is configured to measure the temperature of the exhaust gas at the inlet of the heat recovery device 26 in the exhaust gas line 29.

[0019] The thermometer 21 is provided between the heat recovery device 26 and the dust collector 10 in the exhaust gas line 29 and is configured to measure the temperature of the exhaust gas at the outlet of the heat recovery device 26 in the exhaust gas line 29.

[0020] The thermometer 22 is provided between the wet desulfurization device 14 and the reheater 28 in the exhaust gas line 29 and is configured to measure the temperature of the exhaust gas at the inlet of the reheater 28 in the exhaust gas line 29.

[0021] The thermometer 23 is provided between the reheater 28 and the chimney 16 in the exhaust gas line 29 and is configured to measure the chimney inlet temperature, which is the temperature of the exhaust gas at the inlet of the chimney 16 in the exhaust gas line 29.

[0022] The heat transfer performance monitoring device 24 is configured to monitor the heat transfer performance of the GGH8 based on the measurement results of the flowmeters 18 and 19 and the measurement results of the thermometers 20 to 23. The detailed configuration of the heat transfer performance monitoring device 24 will be described later.

[0023] According to the boiler plant 2, the temperature of the exhaust gas can be reduced by the heat recovery device 26, SO3 and heavy metals can be adsorbed on the ash in the exhaust gas, and the adsorbed substances can be removed together with the ash by the dust collector 10. In addition, the heat recovered by the heat recovery device 26 can be used to reheat the moisture-saturated gas that has exited the wet desulfurization device 14 in order to prevent white smoke from the chimney 16.

[0024] FIG. 2 is a diagram showing an example of the hardware configuration of the heat transfer performance monitoring device 24 shown in FIG. 1. FIG. 3 is a block diagram showing an example of the functional configuration of the heat transfer performance monitoring device 24 shown in FIGS. 1 and 2.

[0025] As shown in FIG. 2, the heat transfer performance monitoring device 24 includes, for example, a processor 72, a RAM (Random Access Memory) 74, a ROM (Read Only Memory) 76, an HDD (Hard Disk Drive) 78, an input I / F 80, and an output I / F 82, and is configured using a computer in which these are connected to each other via a bus 84. Note that the hardware configuration of the heat transfer performance monitoring device 24 is not limited to the above, and may be configured by a combination of a control circuit and a storage device. Further, the heat transfer performance monitoring device 24 is configured by a computer executing a program that realizes each function of the heat transfer performance monitoring device 24. The functions of each part in the heat transfer performance monitoring device 24 described below are realized by, for example, loading a program held in the ROM 76 into the RAM 74 and executing it by the processor 72, and reading and writing data in the RAM 74 and the ROM 76. The heat transfer performance monitoring device 24 may be configured by a distributed control system (DCS) provided in the boiler plant 2.

[0026] As shown in FIG. 3, the heat transfer performance monitoring device 24 includes a data acquisition unit 50, a flow rate control unit 52, a data extraction unit 54, a time series data output unit 56, an alarm signal output unit 58, a heat quantity ratio calculation unit 60, a storage unit 64, and a storage period management unit 66.

[0027] The data acquisition unit 50 acquires the measured value of the flow rate of the exhaust gas flowing through the exhaust gas line 29 (exhaust gas flow rate parameter) from the flow meter 18 and stores it in the storage unit 64 as time-series data. The data acquisition unit 50 acquires the measured value of the flow rate of the steam supplied from the steam supply line 40 to the heat medium heater 38 (steam flow rate parameter) from the flow meter 19 and stores it in the storage unit 64 as time-series data. The data acquisition unit 50 acquires the measured value of the temperature of the exhaust gas at the inlet of the heat recovery device 26 in the exhaust gas line 29 from the thermometer 20 and stores it in the storage unit 64 as time-series data. The data acquisition unit 50 acquires the measured value of the temperature of the exhaust gas at the outlet of the heat recovery device 26 in the exhaust gas line 29 from the thermometer 21 and stores it in the storage unit 64 as time-series data. The data acquisition unit 50 acquires the measured value of the temperature of the exhaust gas at the inlet of the reheater 28 in the exhaust gas line 29 from the thermometer 22 and stores it in the storage unit 64 as time-series data. The data acquisition unit 50 acquires the measured value of the chimney inlet temperature (temperature of the exhaust gas at the outlet of the reheater 28) in the exhaust gas line 29 from the thermometer 23 and stores it in the storage unit 64 as time-series data.

[0028] Based on the measured value of the thermometer 23, the flow rate control unit 52 is configured to control the valve opening degree of the flow rate control valve 44 to adjust the flow rate of the steam supplied to the heat medium heater 38 so that the chimney inlet temperature of the exhaust gas is equal to or higher than a predetermined temperature. Here, the predetermined temperature is set to be equal to or higher than the dew point temperature of the exhaust gas (for example, the dew point temperature of sulfuric acid), and may be, for example, a temperature of 90 °C or higher and 100 °C or lower. Note that the flow rate control unit 52 and the flow rate control valve 44 constitute a steam flow rate adjustment device 53 that adjusts the flow rate of the steam supplied to the heat medium heater 38.

[0029] The heat quantity ratio calculation unit 60 calculates the ratio Q1 / Q2 of the heat recovery amount Q1, which is the amount of heat received by the heat medium flowing through the heat medium circulation line 30 from the exhaust gas in the heat recovery device 26, to the reheating amount Q2, which is the amount of heat received by the exhaust gas flowing through the exhaust gas line 29 from the heat medium in the reheater 28. Here, the heat recovery amount Q1 is calculated, for example, by the product of the flow rate of the exhaust gas flowing through the exhaust gas line 29 (the measured value of the flow meter 18) and the amount of decrease in the temperature of the exhaust gas in the heat recovery device 26 (the value obtained by subtracting the measured value of the thermometer 21 from the measured value of the thermometer 20). Further, the reheating amount Q2 is calculated by the product of the flow rate of the exhaust gas flowing through the exhaust gas line 29 (the measured value of the flow meter 18) and the amount of increase in the temperature of the exhaust gas in the reheater 28 (the value obtained by subtracting the measured value of the thermometer 22 from the measured value of the thermometer 23).

[0030] The data extraction unit 54 is configured to extract the measured values of the flow meter 19 during a period in which the flow rate of the exhaust gas flowing through the exhaust gas line 29 (the measured value of the flow meter 18) is equal to or greater than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device 26 (the measured value of the thermometer 20) is equal to or higher than a predetermined planned temperature from the time-series data of the measured values of the flow meter 19 acquired by the data acquisition unit 50 and stored in the storage unit 64. Here, the "period in which the flow rate of the exhaust gas flowing through the exhaust gas line 29 is equal to or greater than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device 26 is equal to or higher than a predetermined planned temperature" is a period suitable for evaluating the heat transfer performance of the GGH8, and the "planned value" and the "planned temperature" are values for determining a period suitable for evaluating the heat transfer performance. For example, the data extraction unit 54 may extract the measured values of the flow meter 19 during the period in which the boiler is operating at the rated load from the measured values of the flow meter 19 acquired by the data acquisition unit 50. That is, the above "period in which the flow rate of the exhaust gas flowing through the exhaust gas line 29 is equal to or greater than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device 26 is equal to or higher than a predetermined planned temperature" may be the period in which the boiler is operating at the rated load.

[0031] The time-series data output unit 56 outputs time-series data regarding the measured values of the flowmeter 19 extracted by the data extraction unit 54 to a display device 68 such as a display. That is, the time-series data output unit 56 outputs, to the display device 68, time-series data of the flow rate of the steam supplied from the steam supply line 40 to the heat medium heater 38 during a period in which the flow rate of the exhaust gas flowing through the exhaust gas line 29 is equal to or greater than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device 26 is equal to or greater than a predetermined planned temperature.

[0032] The time-series data (time-series data regarding the measured values of the flowmeter 19) output by the time-series data output unit 56 may include the time-series data of the measured values of the flowmeter 19 itself extracted by the data extraction unit 54 (see, for example, FIG. 4), or may include the moving average of the measured values of the flowmeter 19 during a period in which the load of the boiler 4 remains within a predetermined range for a predetermined time or more (for example, a period in which it remains within the range of 80% to 100% of the load for 5 minutes or more) (see FIG. 5). In the examples shown in FIGS. 4 and 5, when the time-series data regarding the measured values of the flowmeter 19 is greater than a predetermined planned value (for example, 0), it indicates that the heat transfer performance of the GGH 8 has deteriorated compared to when the GGH 8 was new, and it shows that the heat transfer performance of the GGH 8 deteriorates as the value of the time-series data regarding the measured values of the flowmeter 19 increases.

[0033] Note that, as shown in FIG. 4, there is an upper limit to the flow rate of the steam that can be supplied to the heat medium heater 38. For this reason, when the flow rate of the steam supplied to the heat medium heater 38 reaches the limit value, even though the flow rate of the exhaust gas of the boiler 4 is equal to or greater than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device 26 is equal to or greater than a predetermined planned temperature, as shown in FIG. 6, the temperature of the exhaust gas at the chimney inlet may become equal to or lower than a predetermined planned value (a temperature equal to or higher than the above-described dew point).

[0034] Thus, even though the flow rate of the exhaust gas from the boiler 4 is equal to or greater than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device 26 is equal to or higher than a predetermined planned temperature, when the chimney inlet temperature of the exhaust gas becomes equal to or lower than a predetermined planned value as shown in FIG. 6, the alarm signal output unit 58 outputs an alarm signal for warning that the chimney inlet temperature is lower than the planned value. This alarm signal may be a signal for outputting a warning display to the display device 68, or may be a signal for giving a warning using other means such as voice. Further, this alarm signal may be a signal for outputting a warning display prompting maintenance of the gas-gas heater to the display device 68.

[0035] Further, the time-series data output unit 56 may output to the display device 68 time-series data (see, for example, FIG. 7 or FIG. 8) indicating the temporal change of data consisting of a combination of the measured value of the flow meter 19 extracted by the data extraction unit 54 and the ratio Q1 / Q2 calculated by the heat quantity ratio calculation unit 60. In FIGS. 7 and 8, each point of t1 to t4 indicates a data point consisting of a combination of the measured value of the flow meter 19 extracted by the data extraction unit 54 and the ratio Q1 / Q2 calculated by the heat quantity ratio calculation unit 60, showing that the data consisting of the above combination has changed in the order of t1, t2, t3, t4 as time elapses.

[0036] As shown in FIG. 7, when the measured value of the flowmeter 19 extracted by the data extraction unit 54 is greater than a predetermined planned value (for example, 0), and the ratio Q1 / Q2 is smaller than the initial value (the value when the GGH8 is new), it indicates that the heat recovery amount Q1 in the heat recovery device 26 has decreased due to the deterioration of the heat transfer performance of the heat recovery device 26 in the GGH8. Also, as shown in FIG. 8, when the measured value of the flowmeter 19 extracted by the data extraction unit 54 is greater than a predetermined planned value (for example, 0), and the ratio Q1 / Q2 is greater than the initial value, it indicates that the reheating amount Q2 in the reheater 28 has decreased due to the deterioration of the heat transfer performance of the reheater 28 in the GGH8. Further, the data plotted over time indicates that the heat transfer performance of the heat recovery device 26 or the reheater 28 is deteriorating as the data deviates from the initial value. The initial value of the ratio Q1 / Q2 may be the ratio Q1 / Q2 obtained during the trial operation of the boiler plant 2 or the like when the GGH8 is newly installed, or it may be a predetermined planned value. Also, the above-mentioned predetermined planned value (for example, 0) for the measured value of the flowmeter 19 may be the initial value of the measured value measured by the flowmeter 19 during the trial operation of the boiler plant 2 or the like when the GGH8 is newly installed.

[0037] The storage period management unit 66 manages the storage period of the measured values of the flowmeter 19 stored in the storage unit 64 such that the storage period of the measured values of the flowmeter 19 during the period when the exhaust gas flow rate of the boiler 4 is less than a predetermined planned value, and the storage period of the measured values of the flowmeter 19 during the period when the exhaust gas temperature at the inlet of the heat recovery device 26 is less than a predetermined planned temperature are each shorter than the storage period of the measured values of the flowmeter 19 (the measured values of the flowmeter 19 during the period when the exhaust gas flow rate of the boiler 4 is greater than or equal to the predetermined planned value and the exhaust gas temperature at the inlet of the heat recovery device 26 is greater than or equal to the predetermined planned temperature) extracted by the data extraction unit 54. Further, the storage period management unit 66 may manage the storage period of the data stored in the storage unit 64 such that the storage period of the measured values of each of the flowmeter 18, thermometer 20, thermometer 21, thermometer 22, and thermometer 23 stored in the storage unit 64 is shorter than the storage period of the measured values of the flowmeter 19 extracted by the data extraction unit 54.

[0038] For example, the storage period management unit 66 may be configured to automatically delete from the storage unit 64 the data for which the corresponding storage period has elapsed for each of the measured values of the flowmeter 19 during the period when the exhaust gas flow rate of the boiler 4 is less than a predetermined planned value, and the measured values of the flowmeter 19 during the period when the exhaust gas temperature at the inlet of the heat recovery device 26 is less than a predetermined planned temperature, and not automatically delete from the storage unit 64 the measured values of the flowmeter 19 during the period when the exhaust gas flow rate of the boiler 4 is greater than or equal to the predetermined planned value and the exhaust gas temperature at the inlet of the heat recovery device 26 is greater than or equal to the predetermined planned temperature. Further, the storage period management unit 66 may be configured to automatically delete from the storage unit 64 the data for which the corresponding storage period has elapsed for each of the measured values of the flowmeter 18, thermometer 20, thermometer 21, thermometer 22, and thermometer 23 stored in the storage unit 64, and not automatically delete from the storage unit 64 the measured values of the flowmeter 19 during the period when the exhaust gas flow rate of the boiler 4 is greater than or equal to the predetermined planned value and the exhaust gas temperature at the inlet of the heat recovery device 26 is greater than or equal to the predetermined planned temperature.

[0039] Further, for example, the storage period management unit 66 sets the storage period of the measured value of the flowmeter 19 during the period when the flow rate of the exhaust gas of the boiler 4 is equal to or higher than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device 26 is equal to or higher than a predetermined planned temperature, with respect to the storage period of the data in the storage unit 64, as a period of one month or longer. The storage period of the measured value of the flowmeter 19 during the period when the flow rate of the exhaust gas of the boiler 4 is less than the predetermined planned value, and the storage period of the measured value of the flowmeter 19 during the period when the temperature of the exhaust gas at the inlet of the heat recovery device 26 is less than the predetermined planned temperature, may each be set as a period of about one to several weeks (for example, a period of one week or longer and less than one month). These measured values stored in the storage unit 64 may be automatically deleted from the storage unit 64 by the storage period management unit 66 when the corresponding storage period has elapsed.

[0040] Next, the effects of the heat transfer performance monitoring device 24 will be described. According to the findings of the inventor of the present application, in the configuration of the above-described boiler plant 2, since the measured value of the flow rate of the steam supplied to the heat medium heater 38 indicates the heat transfer performance of the GGH 8, by monitoring the time-series data regarding the measured value of the flow rate of the steam supplied to the heat medium heater 38, the heat transfer performance of the GGH 8 can be monitored, and a simpler configuration can be achieved compared to conventional monitoring devices. Further, in the heat transfer performance monitoring device 24, for a period suitable for evaluating the heat transfer performance (the period when the flow rate of the exhaust gas of the boiler 4 is equal to or higher than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device 26 is equal to or higher than a predetermined planned temperature), time-series data regarding the measured value of the flow rate of the steam supplied to the heat medium heater 38 can be extracted and monitored. Therefore, compared with the case of monitoring the flow rate of the steam supplied to the heat medium heater 38 during all periods, the data stored in the storage unit 64 for a long period can be reduced, and the heat transfer performance of the GGH 8 can be monitored over a long period with a simple configuration.

[0041] Further, the data extraction unit 54 extracts time-series data of the measured values of the flow meter 19 during the period when the boiler 4 is operating at the rated load from among the measured values of the flow meter 19 acquired by the data acquisition unit 50. Therefore, regarding the period when the boiler 4 is operating at the rated load with a stable load, since the time-series data regarding the measured values of the flow meter 19 can be monitored, it becomes possible to monitor the heat transfer performance of the GGH8 appropriately over a long period with a simple configuration.

[0042] Also, as described with reference to FIG. 5, by monitoring the moving average of the measured values of the flow meter 19 during the period when the load of the boiler 4 is stable, it becomes possible to monitor the heat transfer performance of the GGH8 appropriately over a long period with a simple configuration.

[0043] Also, as described with reference to FIGS. 7 and 8, by outputting to the display device 68 the time-series data showing the change over time of the data composed of the combination of the measured values of the flow meter 19 extracted by the data extraction unit 54 and the ratio Q1 / Q2 calculated by the heat quantity ratio calculation unit 60, it is possible to easily determine whether the heat transfer performance of the heat recovery device 26 or the reheater 28 is deteriorating in the GGH8. Therefore, it helps to grasp the deterioration over time of each device, and it becomes possible to formulate a repair plan at an early stage.

[0044] Further, since the storage period management unit 66 sets the storage period of the measured values that are relatively less important from the viewpoint of monitoring the heat transfer performance of the GGH8 over a long period to be a relatively short storage period, it becomes possible to monitor the heat transfer performance of the GGH8 appropriately over a long period while suppressing an increase in the storage capacity of the storage unit 64. Therefore, it is possible to monitor the heat transfer performance of the GGH8 appropriately over a long period with a simple and low-cost configuration.

[0045] The present disclosure is not limited to the above-described embodiments, and also includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.

[0046] For example, in the above-described embodiment, the steam flow rate parameter related to the flow rate of the steam supplied to the heat medium heater 38 is the flow rate of the steam supplied to the heat medium heater 38 (the measured value of the flow meter 19). However, the steam flow rate parameter related to the flow rate of the steam supplied to the heat medium heater 38 may be the flow rate of the steam drain discharged from the heat medium heater 38. In this case, the steam flow rate parameter is the flow rate of the steam drain measured by a flow meter provided in the steam drain line 42.

[0047] Also, in the above-described embodiment, the exhaust gas flow rate parameter related to the flow rate of the boiler's exhaust gas is the flow rate of the exhaust gas in the exhaust gas line 29 (the measured value of the flow meter 18). However, the exhaust gas flow rate parameter may be, for example, the power generation load of a generator (not shown) that generates electricity using the thermal energy of the steam of the boiler 4, the flow rate of the air (combustion air) supplied to the boiler 4, or the air volume of the induced draft fan 12 (or the opening degree of the moving blades of the induced draft fan 12). Further, in the embodiment shown in FIG. 1, the flow meter 18 was provided at a position between the air preheater 6 and the heat recovery device 26. However, the flow meter 18 may be provided at other positions in the exhaust gas line 29.

[0048] The content described in each of the above embodiments is understood as follows, for example.

[0049] (1) The heat transfer performance monitoring device according to at least one embodiment of the present disclosure is a heat transfer performance monitoring device (for example, the heat transfer performance monitoring device 24 described above) for monitoring the heat transfer performance of a gas-gas heater (for example, the gas-gas heater 8 described above) in a boiler plant (for example, the boiler plant 2 described above), the boiler plant includes a wet desulfurization device (for example, the wet desulfurization device 14 described above) and a chimney (for example, the chimney 16 described above) provided downstream of the wet desulfurization device, the gas-gas heater is a heat recovery device (for example, the heat recovery device 26 described above) provided upstream of the wet desulfurization device and configured to heat the heat medium by heat exchange between the exhaust gas of the boiler and the heat medium, A reheater (for example, the above-described reheater 28) provided between the wet desulfurization apparatus and the chimney in the flow direction of the exhaust gas, configured to heat the exhaust gas after passing through the wet desulfurization apparatus using the heat medium heated by the heat recovery apparatus. A high-temperature side heat medium line (for example, the above-described high-temperature side heat medium line 34) connecting the outlet of the heat medium in the heat recovery apparatus and the inlet of the heat medium in the reheater. A low-temperature side heat medium line (for example, the above-described low-temperature side heat medium line 36) connecting the outlet of the heat medium in the reheater and the inlet of the heat medium in the heat recovery apparatus. A heat medium heater (for example, the above-described heat medium heater 38) provided in the high-temperature side heat medium line, configured to heat the heat medium in the high-temperature side heat medium line using steam. Comprising The boiler plant includes a steam flow rate adjusting device (for example, the above-described steam flow rate adjusting device 53) configured to adjust the flow rate of steam supplied to the heat medium heater so that the temperature of the exhaust gas at the inlet of the chimney becomes equal to or higher than a predetermined temperature. The heat transfer performance monitoring device A data acquisition unit (for example, the above-described data acquisition unit 50) configured to acquire a measured value of a steam flow rate parameter related to the flow rate of steam supplied to the heat medium heater. A data extraction unit (for example, the above-described data extraction unit 54) configured to extract, from the measured values of the steam flow rate parameters acquired by the data acquisition unit, the measured values during a period in which an exhaust gas flow rate parameter related to the flow rate of the exhaust gas of the boiler is equal to or higher than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery apparatus is equal to or higher than a predetermined planned temperature. A time series data output unit (for example, the above-described time series data output unit 56) configured to output time series data related to the measured values of the steam flow rate parameters extracted by the data extraction unit. Comprising

[0050] According to the findings of the inventor of the present application, in the configuration of the boiler plant described in the above (1), the measured value of the steam flow rate parameter regarding the flow rate of the steam supplied to the heat medium heater indicates the heat transfer performance of the gas-gas heater. Therefore, by monitoring the time-series data regarding the measured value of the steam flow rate parameter, the heat transfer performance of the gas-gas heater can be monitored. Further, in the heat transfer performance monitoring device described in the above (1), since it is possible to monitor the time-series data regarding the measured value of the steam flow rate parameter during a period suitable for evaluating the heat transfer performance, compared with the case of monitoring the flow rate of the steam supplied to the heat medium heater during all periods, it is possible to monitor the heat transfer performance of the gas-gas heater over a long period with a simple configuration.

[0051] (2) In some embodiments, in the heat transfer performance monitoring device described in the above (1), The measured value of the steam flow rate parameter acquired by the data acquisition unit is the measured value of the flow rate of the steam supplied to the heat medium heater or the measured value of the flow rate of the steam drain discharged from the heat medium heater.

[0052] According to the heat transfer performance monitoring device described in the above (2), by monitoring the time-series data regarding the measured value of the flow rate of the steam supplied to the heat medium heater or the measured value of the flow rate of the steam drain discharged from the heat medium heater, it is possible to monitor the heat transfer performance of the gas-gas heater over a long period with a simple configuration.

[0053] (3) In some embodiments, in the heat transfer performance monitoring device described in the above (1) or (2), The data extraction unit is configured to extract the measured value of the steam flow rate parameter during the period when the boiler is operating at the rated load from among the measured values of the steam flow rate parameter acquired by the data acquisition unit.

[0054] According to the heat transfer performance monitoring device described in the above (3), since it is possible to monitor the time-series data regarding the measured value of the steam flow rate parameter during the period when the boiler is operating at the rated load with a stable load, it is possible to monitor the heat transfer performance of the gas-gas heater over a long period and appropriately with a simple configuration.

[0055] (4) In some embodiments, in the heat transfer performance monitoring device according to any one of (1) to (3) above, The time series data includes the time series data of the steam flow rate parameter extracted by the data extraction unit.

[0056] According to the heat transfer performance monitoring device described in (4) above, by monitoring the time series data of the steam flow rate parameter extracted by the data extraction unit, it is possible to monitor the heat transfer performance of the gas-gas heater over a long period with a simple configuration.

[0057] (5) In some embodiments, in the heat transfer performance monitoring device according to any one of (1) to (4) above, The time series data includes the moving average of the steam flow rate parameter during a period when the load of the boiler is within a predetermined range for a predetermined time or more.

[0058] According to the heat transfer performance monitoring device described in (5) above, by monitoring the moving average of the steam flow rate parameter during a period when the load of the boiler is stable, it is possible to monitor the heat transfer performance of the gas-gas heater over a long period and appropriately with a simple configuration.

[0059] (6) In some embodiments, in the heat transfer performance monitoring device according to any one of (1) to (5) above, A heat quantity ratio calculation unit (for example, the heat quantity ratio calculation unit 60 described above) configured to calculate a ratio between a heat recovery quantity parameter related to the heat recovery quantity, which is the amount of heat received by the heat medium from the exhaust gas in the heat recovery device, and a reheating quantity parameter related to the reheating quantity, which is the amount of heat received by the exhaust gas from the heat medium in the reheater, is further provided, The time series data output unit is configured to output time series data of data composed of a combination of the steam flow rate parameter extracted by the data extraction unit and the ratio calculated by the heat quantity ratio calculation unit.

[0060] According to the heat transfer performance monitoring device described in (6) above, for example, when the steam flow rate parameter extracted by the data extraction unit is greater than a predetermined planned value, and the above ratio is smaller than the initial value (the value when the gas-gas heater is new), it indicates that the heat transfer performance of the heat recovery device in the gas-gas heater has deteriorated compared to the initial state. Also, when the steam flow rate parameter extracted by the data extraction unit is greater than a predetermined planned value, and the above ratio is greater than the initial value, it indicates that the heat transfer performance of the reheater in the gas-gas heater has deteriorated. Thus, by outputting the time-series data of the data composed of the combination of the steam flow rate parameter extracted by the data extraction unit and the above ratio calculated by the heat quantity ratio calculation unit, it is possible to easily determine whether the heat transfer performance of the heat recovery device or the reheater in the gas-gas heater has deteriorated.

[0061] (7) In some embodiments, in the heat transfer performance monitoring device described in any one of (1) to (6) above, even though the exhaust gas flow rate parameter regarding the exhaust gas flow rate of the boiler is equal to or greater than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device is equal to or higher than a predetermined planned temperature, when the temperature of the exhaust gas at the inlet of the chimney becomes equal to or lower than a predetermined planned value, it is further provided with an alarm signal output unit configured to output an alarm signal for giving a warning.

[0062] According to the heat transfer performance monitoring device described in the above (7), even though the exhaust gas has the heat quantity necessary to make the temperature of the exhaust gas at the inlet of the chimney equal to or higher than the dew point temperature of the exhaust gas (for example, the dew point of sulfuric acid), when the temperature of the exhaust gas at the inlet of the chimney becomes equal to or lower than a predetermined planned value, it is assumed that the heat transfer performance of the gas-gas heater has deteriorated. In such a case, by outputting an alarm signal for prompting maintenance of the gas-gas heater, an alarm signal for warning that the temperature of the exhaust gas at the inlet of the chimney is equal to or lower than the planned value, etc., the heat transfer performance of the gas-gas heater and the temperature of the exhaust gas at the chimney inlet can be appropriately managed.

[0063] (8) In some embodiments, in the heat transfer performance monitoring device according to any one of the above (1) to (7), a storage unit that stores the measured value of the steam flow rate parameter acquired by the data acquisition unit; a storage period management unit configured to manage the storage period of the measured value of the steam flow rate parameter in the storage unit such that each of the storage period of the measured value of the steam flow rate parameter during a period in which the exhaust gas flow rate parameter regarding the exhaust gas flow rate of the boiler is less than a predetermined planned value and the storage period of the measured value of the steam flow rate parameter during a period in which the temperature of the exhaust gas at the inlet of the heat recovery unit is less than a predetermined planned temperature is shorter than the storage period of the measured value of the steam flow rate parameter extracted by the data extraction unit; is further provided.

[0064] According to the heat transfer performance monitoring device described in the above (8), by shortening the storage period of the measured values that are relatively less important from the viewpoint of long-term monitoring of the heat transfer performance of the gas-gas heater, it is possible to suppress an increase in the storage capacity of the storage unit and to enable long-term and appropriate monitoring of the heat transfer performance of the gas-gas heater. For this reason, the heat transfer performance of the gas-gas heater can be monitored long-term and appropriately with a simple and low-cost configuration.

[0065] (9) The heat transfer performance monitoring method according to at least one embodiment of the present disclosure is A heat transfer performance monitoring method for monitoring the heat transfer performance of a gas-gas heater in a boiler plant, wherein the boiler plant includes a wet desulfurization device and a chimney provided downstream of the wet desulfurization device, the gas-gas heater is provided upstream of the wet desulfurization device and is configured to heat the heat medium by heat exchange between the exhaust gas of the boiler and the heat medium; a heat recovery device is provided between the wet desulfurization device and the chimney in the flow direction of the exhaust gas, and is configured to heat the exhaust gas after passing through the wet desulfurization device using the heat medium heated by the heat recovery device; a reheater a high-temperature side heat medium line connecting the outlet of the heat medium in the heat recovery device and the inlet of the heat medium in the reheater; a low-temperature side heat medium line connecting the outlet of the heat medium in the reheater and the inlet of the heat medium in the heat recovery device; a heat medium heater provided on the high-temperature side heat medium line and configured to heat the heat medium in the high-temperature side heat medium line using steam; and the boiler plant includes a steam flow rate adjustment device configured to adjust the flow rate of steam supplied to the heat medium heater so that the temperature of the exhaust gas at the inlet of the chimney is equal to or higher than a predetermined temperature. The heat transfer performance monitoring method includes a data acquisition step of acquiring a measured value of a steam flow rate parameter related to the flow rate of steam supplied to the heat medium heater; a data extraction step of extracting, from the measured values of the steam flow rate parameters acquired in the data acquisition step, the measured values during a period in which an exhaust gas flow rate parameter related to the flow rate of the exhaust gas of the boiler is equal to or higher than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device is equal to or higher than a predetermined planned temperature; a time-series data output step of outputting time-series data related to the measured values of the steam flow rate parameters extracted in the data extraction step. and

[0066] According to the findings of the inventor of the present application, in the boiler plant described in (9) above, the measured value of the steam flow rate parameter regarding the flow rate of the steam supplied to the heat medium heater indicates the heat transfer performance of the gas-gas heater. Therefore, by monitoring the time-series data regarding the measured value of the steam flow rate parameter, the heat transfer performance of the gas-gas heater can be monitored. Further, in the heat transfer performance monitoring method described in (9) above, since the time-series data regarding the measured value of the steam flow rate parameter in a period suitable for evaluating the heat transfer performance can be monitored, compared with the case of monitoring the flow rate of the steam supplied to the heat medium heater in all periods, it becomes possible to monitor the heat transfer performance of the gas-gas heater over a long period with a simple configuration.

Explanation of Signs

[0067] 2 Boiler plant 4 Boiler 5 Denitration device 6 Air preheater 8 Gas heater 10 Dust collector 12 Induced draft fan 14 Wet desulfurization device 16 Chimney 18,19 Flow meter 20,21,22,23 Thermometer 24 Heat transfer performance monitoring device 26 Heat recovery device 28 Reheater 29 Exhaust gas line 30 Heat medium circulation line 32 Heat medium circulation pump 34 High-temperature side heat medium line 36 Low-temperature side heat medium line 38 Heat medium heater 40 Steam supply line 42 Steam drain line 44 Flow control valve 50 Data acquisition unit 52 Flow control unit 53 Steam flow rate adjustment device 54 Data extraction unit 56 Time-series data output unit 58 Alarm signal output unit 60 Calorific value ratio calculation unit 64 Memory unit 66 Storage period management unit 68 Display device 72 Processor 74 RAM 76 ROM 78 HDD 80 Input I / F 82 Output I / F 84 Bus

Claims

1. A heat transfer performance monitoring device for monitoring the heat transfer performance of a gas-gas heater in a boiler plant, wherein the boiler plant includes a wet desulfurization device and a chimney provided downstream of the wet desulfurization device, and the gas-gas heater includes a heat recovery device provided upstream of the wet desulfurization device and configured to heat the heat medium by heat exchange between the exhaust gas of the boiler and the heat medium, a reheater provided between the wet desulfurization device and the chimney in the flow direction of the exhaust gas and configured to heat the exhaust gas after passing through the wet desulfurization device using the heat medium heated by the heat recovery device, a high-temperature side heat medium line connecting the outlet of the heat medium in the heat recovery device and the inlet of the heat medium in the reheater, a low-temperature side heat medium line connecting the outlet of the heat medium in the reheater and the inlet of the heat medium in the heat recovery device, a heat medium heater provided on the high-temperature side heat medium line and configured to heat the heat medium in the high-temperature side heat medium line using steam, and the boiler plant includes a steam flow rate adjustment device configured to adjust the flow rate of steam supplied to the heat medium heater so that the temperature of the exhaust gas at the inlet of the chimney is equal to or higher than a predetermined temperature, and the heat transfer performance monitoring device includes a data acquisition unit configured to acquire a measured value of a steam flow rate parameter related to the flow rate of steam supplied to the heat medium heater, a data extraction unit configured to extract, from the measured values of the steam flow rate parameter acquired by the data acquisition unit, the measured values during a period in which an exhaust gas flow rate parameter related to the flow rate of the exhaust gas of the boiler is equal to or higher than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device is equal to or higher than a predetermined planned temperature, a time series data output unit configured to output time series data related to the measured values of the steam flow rate parameter extracted by the data extraction unit, and an alarm signal output unit configured to output an alarm signal for prompting maintenance of the gas-gas heater when the temperature of the exhaust gas at the inlet of the chimney becomes equal to or lower than a predetermined planned value despite the exhaust gas flow rate parameter being equal to or higher than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device being equal to or higher than a predetermined planned temperature. A heat transfer performance monitoring device comprising the above components.

2. The measured value of the steam flow rate parameter acquired by the data acquisition unit is a measured value of the flow rate of steam supplied to the heat medium heater or a measured value of the flow rate of steam drain discharged from the heat medium heater. The heat transfer performance monitoring device according to claim 1.

3. The data extraction unit is configured to extract a measured value of the steam flow rate parameter during a period in which the boiler is operating at a rated load from among the measured values of the steam flow rate parameter acquired by the data acquisition unit. The heat transfer performance monitoring device according to claim 1 or 2.

4. The time-series data includes time-series data of the steam flow rate parameter extracted by the data extraction unit. The heat transfer performance monitoring device according to any one of claims 1 to 3.

5. The time-series data includes a moving average of the steam flow rate parameter during a period in which the load of the boiler remains within a predetermined range for a predetermined time or more. The heat transfer performance monitoring device according to any one of claims 1 to 3.

6. A heat transfer performance monitoring device for monitoring the heat transfer performance of a gas-gas heater in a boiler plant, The boiler plant includes a wet desulfurization device and a chimney provided downstream of the wet desulfurization device. The gas-gas heater, A heat recovery device provided upstream of the wet desulfurization device and configured to heat the heat medium by heat exchange between the exhaust gas of the boiler and the heat medium. A reheater provided between the wet desulfurization device and the chimney in the flow direction of the exhaust gas and configured to heat the exhaust gas after passing through the wet desulfurization device using the heat medium heated by the heat recovery device. A high-temperature side heat medium line connecting the outlet of the heat medium in the heat recovery device and the inlet of the heat medium in the reheater. A low-temperature side heat medium line connecting the outlet of the heat medium in the reheater and the inlet of the heat medium in the heat recovery device. A heat medium heater provided on the high-temperature side heat medium line and configured to heat the heat medium in the high-temperature side heat medium line using steam. Comprising The boiler plant includes a steam flow rate adjustment device configured to adjust the flow rate of steam supplied to the heat medium heater so that the temperature of the exhaust gas at the inlet of the chimney is equal to or higher than a predetermined temperature. The heat transfer performance monitoring device, A data acquisition unit configured to acquire a measured value of a steam flow rate parameter related to the flow rate of steam supplied to the heat medium heater. A data extraction unit configured to extract measurement values of the steam flow rate parameter obtained by the data acquisition unit during a period in which an exhaust gas flow rate parameter related to the flow rate of the boiler's exhaust gas is equal to or greater than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery unit is equal to or greater than a predetermined planned temperature. A time-series data output unit that outputs time-series data related to the measurement values of the steam flow rate parameter extracted by the data extraction unit. A heat quantity ratio calculation unit configured to calculate the ratio between a heat recovery quantity parameter related to the amount of heat received by the heat medium from the exhaust gas in the heat recovery unit and a reheating quantity parameter related to the amount of heat received by the exhaust gas from the heat medium in the reheater. Comprising: A heat transfer performance monitoring device configured such that the time-series data output unit outputs time-series data of data consisting of a combination of the steam flow rate parameter extracted by the data extraction unit and the ratio calculated by the heat quantity ratio calculation unit.

7. The heat transfer performance monitoring device according to claim 6, further comprising an alarm signal output unit configured to output an alarm signal for giving a warning when the temperature of the exhaust gas at the inlet of the chimney becomes equal to or lower than a predetermined planned value even though the exhaust gas flow rate parameter related to the flow rate of the boiler's exhaust gas is equal to or greater than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery unit is equal to or greater than a predetermined planned temperature.

8. A heat transfer performance monitoring device for monitoring the heat transfer performance of a gas-gas heater in a boiler plant, wherein the boiler plant includes a wet desulfurization device and a chimney provided downstream of the wet desulfurization device, and the gas-gas heater is provided upstream of the wet desulfurization device and includes a heat recovery unit configured to heat the heat medium by heat exchange between the exhaust gas of the boiler and the heat medium, is provided between the wet desulfurization device and the chimney in the flow direction of the exhaust gas, and includes a reheater configured to heat the exhaust gas that has passed through the wet desulfurization device using the heat medium heated by the heat recovery unit, and a high-temperature side heat medium line connecting the outlet of the heat medium in the heat recovery unit and the inlet of the heat medium in the reheater. A low-temperature side heat medium line connecting the outlet of the heat medium in the reheater and the inlet of the heat medium in the heat recovery unit; A heat medium heater provided in the high-temperature side heat medium line for heating the heat medium in the high-temperature side heat medium line using steam; Comprising; The boiler plant includes a steam flow rate adjustment device that adjusts the flow rate of steam supplied to the heat medium heater so that the temperature of the exhaust gas at the inlet of the chimney is equal to or higher than a predetermined temperature. The heat transfer performance monitoring device; A data acquisition unit configured to acquire a measured value of a steam flow rate parameter related to the flow rate of steam supplied to the heat medium heater; A data extraction unit configured to extract, from the measured values of the steam flow rate parameters acquired by the data acquisition unit, the measured values during a period in which an exhaust gas flow rate parameter related to the flow rate of the exhaust gas of the boiler is equal to or higher than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery unit is equal to or higher than a predetermined planned temperature; A time series data output unit that outputs time series data related to the measured values of the steam flow rate parameters extracted by the data extraction unit; A storage unit that stores the measured values of the steam flow rate parameters acquired by the data acquisition unit; A storage period management unit configured to manage the storage period of the measured values of the steam flow rate parameters in the storage unit such that each of the storage period of the measured values of the steam flow rate parameters during a period in which an exhaust gas flow rate parameter related to the flow rate of the exhaust gas of the boiler is less than a predetermined planned value and the storage period of the measured values of the steam flow rate parameters during a period in which the temperature of the exhaust gas at the inlet of the heat recovery unit is less than a predetermined planned temperature is shorter than the storage period of the measured values of the steam flow rate parameters extracted by the data extraction unit; A heat transfer performance monitoring device comprising the above.

9. A heat transfer performance monitoring method for monitoring the heat transfer performance of a gas-gas heater in a boiler plant, The boiler plant includes a wet desulfurization device and a chimney provided downstream of the wet desulfurization device, The gas-gas heater; A heat recovery unit provided upstream of the wet desulfurization device and configured to heat the heat medium by heat exchange between the exhaust gas of the boiler and the heat medium; A reheater provided between the wet desulfurization apparatus and the chimney in the flow direction of the exhaust gas, configured to heat the exhaust gas that has passed through the wet desulfurization apparatus using the heat medium heated by the heat recovery apparatus; A high-temperature side heat medium line connecting the outlet of the heat medium in the heat recovery apparatus and the inlet of the heat medium in the reheater; A low-temperature side heat medium line connecting the outlet of the heat medium in the reheater and the inlet of the heat medium in the heat recovery apparatus; A heat medium heater provided in the high-temperature side heat medium line, configured to heat the heat medium in the high-temperature side heat medium line using steam; Comprising; The boiler plant includes a steam flow rate adjustment device that adjusts the flow rate of steam supplied to the heat medium heater so that the temperature of the exhaust gas at the inlet of the chimney is equal to or higher than a predetermined temperature. The heat transfer performance monitoring method is as follows: A data acquisition step of acquiring a measured value of a steam flow rate parameter related to the flow rate of steam supplied to the heat medium heater; A data extraction step of extracting the measured value during a period in which an exhaust gas flow rate parameter related to the flow rate of the exhaust gas from the boiler is equal to or higher than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery apparatus is equal to or higher than a predetermined planned temperature, from the measured values of the steam flow rate parameter acquired in the data acquisition step; A time-series data output step of outputting time-series data related to the measured value of the steam flow rate parameter extracted in the data extraction step; An alarm signal output step of outputting an alarm signal for prompting maintenance of the gas-gas heater when the temperature of the exhaust gas at the inlet of the chimney becomes equal to or lower than a predetermined planned value, even though the exhaust gas flow rate parameter is equal to or higher than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery apparatus is equal to or higher than a predetermined planned temperature; A heat transfer performance monitoring method comprising the above steps.

10. A heat transfer performance monitoring method for monitoring the heat transfer performance of a gas-gas heater in a boiler plant, The boiler plant includes a wet desulfurization apparatus and a chimney provided downstream of the wet desulfurization apparatus, The gas-gas heater is as follows: A heat recovery apparatus provided upstream of the wet desulfurization apparatus, configured to heat the heat medium by heat exchange between the exhaust gas from the boiler and the heat medium. A reheater provided between the wet desulfurization device and the chimney in the flow direction of the exhaust gas, configured to heat the exhaust gas after passing through the wet desulfurization device using the heat medium heated by the heat recovery device; A high-temperature side heat medium line connecting the outlet of the heat medium in the heat recovery device and the inlet of the heat medium in the reheater; A low-temperature side heat medium line connecting the outlet of the heat medium in the reheater and the inlet of the heat medium in the heat recovery device; A heat medium heater provided on the high-temperature side heat medium line, configured to heat the heat medium in the high-temperature side heat medium line using steam; Comprising; The boiler plant includes a steam flow rate adjustment device configured to adjust the flow rate of steam supplied to the heat medium heater so that the temperature of the exhaust gas at the inlet of the chimney is equal to or higher than a predetermined temperature; The heat transfer performance monitoring method is as follows: A data acquisition step of acquiring a measured value of a steam flow rate parameter related to the flow rate of steam supplied to the heat medium heater; A data extraction step of extracting the measured value during a period in which an exhaust gas flow rate parameter related to the flow rate of the boiler's exhaust gas is equal to or higher than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device is equal to or higher than a predetermined planned temperature from the measured values of the steam flow rate parameter acquired in the data acquisition step; A time-series data output step of outputting time-series data of the measured values of the steam flow rate parameter extracted in the data extraction step; A heat quantity ratio calculation step of calculating the ratio between a heat recovery quantity parameter related to the amount of heat received by the heat medium from the exhaust gas in the heat recovery device and a reheating quantity parameter related to the amount of heat received by the exhaust gas from the heat medium in the reheater; Comprising; In the time-series data output step, a heat transfer performance monitoring method for outputting time-series data of data composed of a combination of the steam flow rate parameter extracted in the data extraction step and the ratio calculated in the heat quantity ratio calculation step.

11. A heat transfer performance monitoring method for monitoring the heat transfer performance of a gas-gas heater in a boiler plant, The boiler plant includes a wet desulfurization device and a chimney provided downstream of the wet desulfurization device, The gas-gas heater is A heat recovery device provided upstream of the wet desulfurization device and configured to heat the heat medium by heat exchange between the exhaust gas of the boiler and the heat medium; A reheater provided between the wet desulfurization device and the chimney in the flow direction of the exhaust gas and configured to heat the exhaust gas after passing through the wet desulfurization device using the heat medium heated by the heat recovery device; A high-temperature side heat medium line connecting the outlet of the heat medium in the heat recovery device and the inlet of the heat medium in the reheater; A low-temperature side heat medium line connecting the outlet of the heat medium in the reheater and the inlet of the heat medium in the heat recovery device; A heat medium heater provided on the high-temperature side heat medium line and configured to heat the heat medium in the high-temperature side heat medium line using steam; Comprising; The boiler plant includes a steam flow rate adjustment device that adjusts the flow rate of steam supplied to the heat medium heater so that the temperature of the exhaust gas at the inlet of the chimney is equal to or higher than a predetermined temperature. The heat transfer performance monitoring method is as follows: A data acquisition step of acquiring a measured value of a steam flow rate parameter related to the flow rate of steam supplied to the heat medium heater; A data extraction step of extracting the measured value during a period in which an exhaust gas flow rate parameter related to the flow rate of the exhaust gas of the boiler is equal to or higher than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device is equal to or higher than a predetermined planned temperature from the measured values of the steam flow rate parameter acquired in the data acquisition step; A time-series data output step of outputting time-series data related to the measured value of the steam flow rate parameter extracted in the data extraction step; A data extraction step of extracting the measured value during a period in which the exhaust gas flow rate parameter is equal to or higher than a predetermined planned value and the temperature of the exhaust gas at the inlet of the heat recovery device is equal to or higher than a predetermined planned temperature from the measured values of the steam flow rate parameter acquired in the data acquisition step; A time-series data output step of outputting time-series data related to the measured value of the steam flow rate parameter extracted in the data extraction step; A storage step of storing the measured value of the steam flow rate parameter acquired by the data acquisition step; A storage period management step for managing the storage period of the measured value of the steam flow rate parameter during a period when the exhaust gas flow rate parameter is less than a predetermined planned value, and the storage period of the measured value of the steam flow rate parameter during a period when the temperature of the exhaust gas at the inlet of the heat recovery device is less than a predetermined planned temperature, such that each of the storage periods is shorter than the storage period of the measured value of the steam flow rate parameter extracted by the data extraction step. A heat transfer performance monitoring method comprising the above. **Claim 12** The data acquisition unit is configured to acquire the measured value of the exhaust gas flow rate parameter and the measured value of the temperature of the exhaust gas at the inlet of the heat recovery device. The heat transfer performance monitoring device A storage unit for storing the measured value of the steam flow rate parameter acquired by the data acquisition unit, the measured value of the exhaust gas flow rate parameter acquired by the data acquisition unit, and the measured value of the temperature of the exhaust gas at the inlet of the heat recovery device acquired by the data acquisition unit. A storage period management unit configured to manage the data stored in the storage unit such that each of the storage period of the measured value of the exhaust gas flow rate parameter stored in the storage unit and the storage period of the measured value of the temperature of the exhaust gas at the inlet of the heat recovery device stored in the storage unit is shorter than the storage period of the measured value of the steam flow rate parameter stored in the storage unit. The heat transfer performance monitoring device according to claim 1, further comprising the above. **Claim 13** In the data acquisition step, the measured value of the exhaust gas flow rate parameter and the measured value of the temperature of the exhaust gas at the inlet of the heat recovery device are acquired. The heat transfer performance monitoring method A storage step of storing the measured value of the steam flow rate parameter acquired in the data acquisition step, the measured value of the exhaust gas flow rate parameter acquired in the data acquisition step, and the measured value of the temperature of the exhaust gas at the inlet of the heat recovery device acquired in the data acquisition step. A storage period management step configured to manage the data stored in the storage step such that each of the storage period of the exhaust gas flow rate parameter stored in the storage step and the storage period of the measured value of the temperature of the exhaust gas at the inlet of the heat recovery device stored in the storage step is shorter than the storage period of the measured value of the steam flow rate parameter stored in the storage step; The heat transfer performance monitoring method according to claim 9, further comprising.

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