Thermal Power Plant

Abstract

A steam power plant 100 is provided with: a first tank 1 that houses liquid ammonia; a boiler 2 that is connected to the first tank 1 and that burns fuel containing ammonia; a steam turbine 3 that is connected to the boiler 2 and that runs by means of steam from the boiler 2; a steam condenser 4 that is connected to the steam turbine 3 and that condenses steam discharged from the steam turbine 3 into water; and a vaporizer 5 disposed between the first tank 1 and the boiler 2 along the flow of ammonia. The vaporizer 5 is recirculatingly connected to the steam condenser 4, heats the liquid ammonia from the first tank 1 by means of first water from the steam condenser 4, and returns the first water that has been cooled by the liquid ammonia to the steam condenser 4.

Description

[Technical field]

[0001] This disclosure relates to a thermal power plant. This application claims the benefit of priority from Japanese Patent Application No. 2022-51772 filed on March 28, 2022, the contents of which are incorporated herein by reference. [Background technology]

[0002] Ammonia is CO 2 It is known as a fuel that does not emit ammonia. For example, Patent Documents 1 to 3 disclose a thermal power plant that uses ammonia as fuel. In these documents, ammonia is stored in a tank in a liquid state. The liquid ammonia is vaporized before being supplied to a boiler, and is burned in a gaseous state in the boiler. In these documents, water steam discharged from a steam turbine is used to vaporize the ammonia. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-185313 A [Patent Document 2] International Publication No. 2020 / 115822 [Patent Document 3] International Publication No. 2020 / 184612 Summary of the Invention [Problem to be solved by the invention]

[0004] A thermal power plant includes many components such as numerous pipes, etc. Therefore, miniaturization and simplification of each component, including the components required for vaporizing ammonia, can lead to reduction in facility costs.

[0005] The present disclosure aims to provide a thermal power plant that allows for miniaturization and simplification of the components required for vaporization of ammonia. [Means for solving the problem]

[0006] A thermal power plant according to one embodiment of the present disclosure includes a first tank that stores liquid ammonia, a boiler that is connected to the first tank and burns a fuel containing ammonia, a steam turbine that is connected to the boiler and operates using steam from the boiler, a condenser that is connected to the steam turbine and condenses the steam discharged from the steam turbine into water, and a vaporizer that is disposed between the first tank and the boiler in a flow of ammonia, the vaporizer being circulatory connected to the condenser, heating the liquid ammonia from the first tank with first water from the condenser, and returning the first water cooled by the liquid ammonia to the condenser. The condenser includes a surface condenser that condenses the steam discharged from the steam turbine into water using second water from the outside and discharges the second water used for condensation to the outside. .

[0008] The second water may be sea water or river water.

[0009] A return line from the vaporizer to the condenser may be connected to the portion of the condenser through which the water vapor passes.

[0010] The thermal power plant may include a first sensor that measures a vacuum in a portion of the condenser through which steam passes, a pump that sends second water to the surface condenser, and a control device that is communicatively connected to the first sensor and the pump and configured to control the pump to adjust the amount of the second water based on the vacuum measured by the first sensor.

[0011] The thermal power plant may include a second sensor that measures a temperature of the first water passing through the return line, a pump that sends the second water to a surface condenser, and a control device that is communicatively connected to the second sensor and the pump and configured to control the pump to adjust the amount of the second water based on the temperature of the first water measured by the second sensor.

[0012] In addition, in an aspect including a first sensor, the thermal power plant may include a second sensor that measures the temperature of the first water passing through the return line, and the control device may be communicatively connected to the second sensor and configured to control the pump to adjust the amount of the second water based on the temperature of the first water measured by the second sensor.

[0013] The thermal power plant may include a third sensor that measures a parameter indicative of an amount of liquid ammonia supplied from the first tank to the vaporizer, a pump that delivers the second water to the surface condenser, and a control device communicatively connected to the third sensor and the pump and configured to control the pump to adjust the amount of the second water based on the parameter measured by the third sensor measured by the third sensor.

[0014] The thermal power plant may include a third sensor that measures a parameter indicative of the amount of liquid ammonia supplied from the first tank to the vaporizer, a second tank that is circulatory connected to the condenser, a valve provided between the condenser and the second tank that allows or blocks the flow of the first water from the condenser to the second tank, and a control device that is communicatively connected to the third sensor and the valve and configured to control the valve based on the parameter measured by the third sensor.

[0015] In addition, in an aspect including at least one of the first sensor or the second sensor, the thermal power plant may include a third sensor that measures a parameter indicative of the amount of liquid ammonia supplied from the first tank to the vaporizer, a second tank that is circulatorily connected to the condenser, and a valve provided between the condenser and the second tank that allows or blocks the flow of the first water from the condenser to the second tank, and the control device may be communicatively connected to the third sensor and the valve and may be configured to control the valve based on the parameter measured by the third sensor. Effect of the Invention

[0016] The present disclosure allows for miniaturization and simplification of the components required for vaporizing ammonia. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic diagram showing a steam power plant according to a first embodiment. [Diagram 2] FIG. 2 is a schematic diagram showing a steam power plant according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The specific dimensions, materials, numerical values, etc. shown in the embodiments are merely examples for facilitating understanding, and do not limit the present disclosure unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are given the same reference numerals to avoid repeated explanations, and elements not directly related to the present disclosure are omitted from the drawings.

[0019] FIG. 1 is a schematic diagram showing a thermal power plant 100 according to a first embodiment. Hereinafter, the thermal power plant 100 may also be simply referred to as a "plant." For example, the plant 100 includes a tank (first tank) 1, a boiler 2, a steam turbine 3, a condenser 4, an evaporator 5, a first low-pressure feedwater heater 6a, a second low-pressure feedwater heater 6b, a deaerator 7, a high-pressure feedwater heater 8, pumps 9a, 9b, 9c, and 9d, and a control device 90. The components of the plant 100 are not limited to these, and the plant 100 may further include other components. In addition, the plant 100 may not include at least one of the above components.

[0020] Tank 1 stores ammonia. Specifically, tank 1 stores liquid ammonia. Vaporizer 5 is connected to tank 1 by pipe P1. The vaporizer 5 will be described in detail later.

[0021] The boiler 2 is connected to the vaporizer 5 by a pipe P2. The boiler 2 is connected to the tank 1 via the pipe P1, the vaporizer 5, and the pipe P2, and the ammonia in the tank 1 is supplied to the boiler 2 through these. The boiler 2 burns a fuel containing ammonia from the tank 1. For example, the boiler 2 may burn a mixed fuel containing ammonia and another fuel such as natural gas. Also, for example, the boiler 2 may burn only ammonia. Also, for example, the boiler 2 may burn only another fuel other than ammonia, as necessary. The boiler 2 heats water by heat from combustion to generate steam.

[0022] The steam turbine 3 is connected to the boiler 2 by a pipe P3. The steam generated in the boiler 2 is supplied to the steam turbine 3 via the pipe P3. The steam turbine 3 is operated by the steam from the boiler 2 to generate power.

[0023] The condenser 4 is connected to the steam turbine 3. Steam discharged from the steam turbine 3, i.e., the steam that finally flows out from the steam turbine 3, flows into the condenser 4. Hereinafter, the steam that finally flows out from the steam turbine 3 may also be simply referred to as "exhaust".

[0024] The condenser 4 condenses the exhaust gas from the steam turbine 3 into water. The condensed water is stored in the hot well 41. The condenser 4 includes a surface condenser 4A. The surface condenser 4A takes in second water from the outside via a pipe P7. For example, the second water can be seawater, river water, tap water, or a combination of these. In this embodiment, the condenser 4 takes in seawater from the outside and condenses the exhaust gas from the steam turbine 3 into water using the seawater.

[0025] The condenser 4 discharges the second water used for condensation to the outside via a pipe P8. For example, the pipe P8 may be connected to the sea, a river, or a sewer. In this embodiment, the pipe P8 is connected to the sea, and the condenser 4 discharges seawater used for condensation to the sea.

[0026] Furthermore, in the steam turbine 3, a portion of the steam is extracted from a position upstream of the condenser 4 in the flow of the steam, that is, from a position midway through the steam turbine 3. Hereinafter, the steam extracted from a position midway through the steam turbine 3 may be simply referred to as "bleed steam." The extracted steam is supplied to the first low-pressure feedwater heater 6a, the second low-pressure feedwater heater 6b, and the high-pressure feedwater heater 8 via pipes P4, P5, and P6, respectively.

[0027] The first low-pressure feedwater heater 6a is provided in a portion of the condenser 4 through which the exhaust gas from the steam turbine 3 passes. The first low-pressure feedwater heater 6a is connected to the hot well 41 of the condenser 4 by the pipe P9. The water (first water) contained in the hot well 41 is supplied to the first low-pressure feedwater heater 6a by the pipe P9. This water is heated by the extracted steam from the pipe P4 in the first low-pressure feedwater heater 6a. In other words, the extracted steam from the pipe P4 is cooled by the water from the hot well 41. This cooled water steam or water is injected into the condenser 4 through the pipe P10. Specifically, the pipe P10 is connected to a portion of the condenser 4 through which the exhaust gas from the steam turbine 3 passes. Therefore, the exhaust gas from the steam turbine 3 is cooled by the water injected from the pipe P10 and condensed into water. That is, this portion of the condenser 4 can also be called a direct contact condenser.

[0028] Furthermore, the water from the hot well 41 is heated in the first low-pressure feed water heater 6a by the exhaust air from the steam turbine 3. In other words, the exhaust air from the steam turbine 3 is cooled by the water from the hot well 41 and condensed into water.

[0029] The second low-pressure feedwater heater 6b is connected to the first low-pressure feedwater heater 6a by the pipe P11. The water heated by the first low-pressure feedwater heater 6a is supplied to the second low-pressure feedwater heater 6b by the pipe P11. The water is heated in the second low-pressure feedwater heater 6b by the extraction steam from the pipe P5. The pipe P5 is located upstream of the pipe P4 in the flow of steam in the steam turbine 3. Therefore, the extraction steam from the pipe P5 is hotter than the extraction steam from the pipe P4. Therefore, the second low-pressure feedwater heater 6b further heats the water from the first low-pressure feedwater heater 6a by the extraction steam from the pipe P5. In contrast, the extraction steam from the pipe P5 is cooled by the water from the first low-pressure feedwater heater 6a. This cooled steam or water may be supplied to a condenser, for example (not shown).

[0030] 1, the plant 100 includes two low pressure feedwater heaters 6a, 6b. In other embodiments, the plant 100 may include a single low pressure feedwater heater or more than two low pressure feedwater heaters. In this case, the number of positions at which extraction steam is extracted from the steam turbine 3 may also be varied as required.

[0031] The deaerator 7 is connected to the second low-pressure feedwater heater 6b by a pipe P12. Water heated by the second low-pressure feedwater heater 6b is supplied to the deaerator 7 by the pipe P12. The deaerator 7 further heats the water from the second low-pressure feedwater heater 6b and removes dissolved gases in the water. Although not shown, for example, the deaerator 7 may further heat the water from the second low-pressure feedwater heater 6b by extraction steam from the steam turbine 3. In other embodiments, the deaerator 7 may use other heat media.

[0032] The high-pressure feedwater heater 8 is connected to the deaerator 7 by a pipe P13. The water from which dissolved gas has been removed in the deaerator 7 is supplied to the high-pressure feedwater heater 8 by the pipe P13. The water is heated in the high-pressure feedwater heater 8 by the extraction steam from the pipe P6. In this embodiment, the pipe P6 is located at the most upstream side of the extraction steam pipes in the flow of steam in the steam turbine 3. Therefore, the extraction steam from the pipe P6 is hotter than the extraction steam from the other pipes. Therefore, the high-pressure feedwater heater 8 further heats the water from the deaerator 7 by the extraction steam from the pipe P6. The heated water is supplied to the boiler 2 via the pipe P14. In contrast, the extraction steam from the pipe P6 is cooled by the water from the deaerator 7. This cooled steam or water may be supplied to a condenser, for example (not shown).

[0033] As described above, the water supplied from the high-pressure feed water heater 8 to the boiler 2 is heated to steam in the boiler 2. The steam is supplied from the boiler 2 to the steam turbine 3 and used for operations such as power generation.

[0034] The pump 9a supplies the ammonia in the tank 1 to the boiler 2 via the vaporizer 5. For example, the pump 9a is provided in the pipe P1. The pump 9b supplies the second water from the outside to the condenser 4. For example, the pump 9b is provided in the pipe P7. The pump 9c supplies the water in the condenser 4 to the boiler 2 via the low-pressure feed water heaters 6a and 6b, the deaerator 7, and the high-pressure feed water heater 8. For example, the pump 9c is provided in the pipe P13. The pumps 9a, 9b, and 9c may be connected to the control device 90 in a wired or wireless manner so as to be able to communicate with each other, and may be controlled by the control device 90.

[0035] The control device 90 controls the whole or a part of the plant 100. The control device 90 includes components such as a processor 90a, a storage device 90b, and a connector 90c, and these components are connected to each other via a bus. For example, the processor 90a includes a CPU (Central Processing Unit) and the like. For example, the storage device 90b includes a hard disk, a ROM in which programs and the like are stored, and a RAM as a work area. The control device 90 is connected to the components of the plant 100 via the connector 90c so as to be able to communicate with each other via wired or wireless communication. For example, the control device 90 may further include other components such as a display device such as a liquid crystal display or a touch panel, and an input device such as a keyboard, a button, or a touch panel. For example, the operation of the control device 90 described in the present disclosure may be realized by executing a program stored in the storage device 90b in the processor 90a.

[0036] Next, the vaporizer 5 will be described in detail.

[0037] The vaporizer 5 is disposed between the tank 1 and the boiler 2 in the flow of ammonia. The vaporizer 5 is supplied with liquid ammonia from the tank 1. The vaporizer 5 is also circulatorily connected to the condenser 4. Specifically, the vaporizer 5 is connected to the hot well 41 of the condenser 4 by the pipe P15. The water in the hot well 41 is supplied to the vaporizer 5 by the pipe P15. The vaporizer 5 heats the liquid ammonia from the tank 1 by the water (first water) from the hot well 41. Thus, all or at least a part of the liquid ammonia is vaporized. The vaporized ammonia is supplied to the boiler 2 by the pipe P2 as described above, and used as fuel.

[0038] Moreover, the vaporizer 5 is connected to the condenser 4 by a pipe (return line) P16. The water used to heat the liquid ammonia, i.e., the water cooled by the liquid ammonia, is returned to the condenser 4 by the pipe P16. More specifically, the pipe P16 is connected to a portion of the condenser 4 through which the exhaust gas from the steam turbine 3 passes. Therefore, the water vapor from the steam turbine 3 is cooled by the water injected from the pipe P16 and condensed into water. As described above, this portion of the condenser 4 can also be called a direct contact condenser.

[0039] The pump 9d circulates water (first water) between the condenser 4 and the vaporizer 5. For example, the pump 9d may be provided in the pipe P15. The pump 9d may be connected to the control device 90 in a wired or wireless manner so as to be able to communicate with the control device 90, and may be controlled by the control device 90.

[0040] A first sensor S1 is provided in the condenser 4 in a portion through which the water vapor passes. The first sensor S1 measures the degree of vacuum in the portion through which the water vapor passes (i.e., the pressure of the gas present in this portion). The first sensor S1 is connected to the control device 90 in a wired or wireless manner so as to be able to communicate with the control device 90, and transmits measured data to the control device 90.

[0041] A second sensor S2 is provided in the pipe P16. The second sensor measures the temperature of the water (first water) passing through the pipe P16. The second sensor S2 is connected to the control device 90 by wire or wirelessly so as to be able to communicate with the control device 90, and transmits measured data to the control device 90.

[0042] The third sensor S3 measures a parameter indicative of the amount of liquid ammonia supplied from the tank 1 to the vaporizer 5. Such a parameter may include, for example, at least one of a flow rate, a pressure, or a temperature. For example, the third sensor S3 is provided in the pipe P1. The third sensor S3 is communicatively connected to the control device 90 by wire or wirelessly, and transmits the measured parameter to the control device 90.

[0043] The control device 90 may control the pump 9b to adjust the flow rate of water (second water) from the outside based on at least one of the parameters indicating the degree of vacuum measured by the first sensor S1, the temperature of the water measured by the second sensor S2, and the amount of liquid ammonia measured by the third sensor S3. Specifically, when the amount of ammonia vaporized in the vaporizer 5 increases, the temperature of the water passing through the pipe P16 decreases. Therefore, the temperature of the water measured by the second sensor S2 decreases. Also, in this case, the amount of water condensed by the water injected from the pipe P16 increases in the condenser 4. Therefore, the pressure in the condenser 4 measured by the first sensor S1 decreases. In such a case, the exhaust from the steam turbine 3 is sufficiently condensed, so that the amount of water sent from the pump 9b to the surface condenser 4A can be reduced. For example, the processor 90a may control the pump 9b to reduce the amount of water sent from the pump 9b to the surface condenser 4A as the pressure measured by the first sensor S1 decreases. Also, for example, the processor 90a may control the pump 9b to decrease the amount of water sent from the pump 9b to the surface condenser 4A as the temperature of the water measured by the second sensor S2 decreases. Also, for example, the processor 90a may control the pump 9b to decrease the amount of water sent from the pump 9b to the surface condenser 4A as the amount of liquid ammonia measured by the third sensor S3 increases.

[0044] The plant 100 as described above includes a tank 1 for storing liquid ammonia, a boiler 2 connected to the tank 1 and burning a fuel containing ammonia, a steam turbine 3 connected to the boiler 2 and operated by steam from the boiler 2, a condenser 4 connected to the steam turbine 3 and condensing the steam discharged from the steam turbine 3 into water, and a vaporizer 5 disposed between the tank 1 and the boiler 2 in the flow of ammonia, the vaporizer 5 being cyclically connected to the condenser 4, heating the liquid ammonia from the tank 1 by the first water from the condenser 4, and returning the first water cooled by the liquid ammonia to the condenser 4. According to this configuration, the water stored in the condenser 4, i.e., the liquid, is used to vaporize the liquid ammonia in the vaporizer 5. Since the volume of water is smaller than the volume of steam, components such as the pipes P15 and P16 and the vaporizer 5 can be made smaller than when steam is used to vaporize the liquid ammonia. In addition, handling of liquid is easier than handling of gas. This makes it possible to reduce the size and simplify components necessary for vaporizing ammonia, such as the pipes P15, P16 and the vaporizer 5. For example, such a plant 100 can be realized by adding components such as the tank 1, the vaporizer 5, and the associated pipes to an existing thermal power plant that does not use ammonia.

[0045] Moreover, in the plant 100, the condenser 4 includes a surface condenser 4A that condenses the steam discharged from the steam turbine 3 into water by the second water from the outside and discharges the second water used for the condensation to the outside. With this configuration, the second water does not pass through the vaporizer 5 and is not directly used for vaporizing the liquid ammonia. Therefore, it is possible to reduce the risk of ammonia leaking into the second water from the outside.

[0046] In the plant 100, the second water is seawater. Seawater is available in large quantities at low cost. Therefore, the operating costs of the plant 100 can be reduced.

[0047] Furthermore, in the plant 100, the return line P16 from the vaporizer 5 to the condenser 4 is connected to a portion of the condenser 4 through which the steam from the steam turbine 3 passes. With this configuration, the water cooled by ammonia in the vaporizer 5 can be used to condense the steam in the condenser 4. This can improve the thermal efficiency.

[0048] The plant 100 also includes a first sensor S1 that measures the degree of vacuum in the portion of the condenser 4 through which the steam passes, a pump 9b that sends the second water to the surface condenser 4A, and a control device 90 that is communicatively connected to the first sensor S1 and the pump 9b and that is configured to control the pump 9b to adjust the amount of the second water based on the degree of vacuum measured by the first sensor S1. With this configuration, the power consumption of the pump 9b can be reduced depending on the situation. Therefore, the energy efficiency of the plant 100 can be improved.

[0049] The plant 100 also includes a second sensor S2 that measures the temperature of the first water passing through the return line P16, a pump 9b that sends the second water to the surface condenser 4A, and a control device 90 that is communicatively connected to the second sensor S2 and the pump 9b and is configured to control the pump 9b to adjust the amount of the second water based on the temperature of the first water measured by the second sensor S2. With this configuration, the power consumption of the pump 9b can be reduced depending on the situation. Therefore, the energy efficiency of the plant 100 can be improved.

[0050] Next, a steam power plant according to another embodiment will be described.

[0051] 2 is a schematic diagram showing a thermal power plant 100A according to the second embodiment. The plant 100A differs from the plant 100 according to the first embodiment in that the plant 100A includes a tank (second tank) 42. Accordingly, the plant 100A further includes pumps 9e, 9f and valves V1, V2. In other respects, the plant 100A may be the same as the plant 100 according to the first embodiment.

[0052] The tank 42 is circulatorily connected to the condenser 4. In the present disclosure, the tank 42 may also be referred to as a spillover tank. Specifically, the tank 42 is connected to the hot well 41 of the condenser 4 by a pipe P17. Water from the hot well 41 is supplied to the tank 42 by the pipe P17. In addition, the tank 42 is connected to the hot well 41 by a pipe P18. The water from the tank 42 is returned to the hot well 41 by the pipe P18.

[0053] The valve V1 and the pump 9e are provided in the pipe P17. The valve V1 is capable of adjusting the water flow path area in the pipe P17, and allows or blocks the flow of water from the hot well 41 to the tank 42. The pump 9e sends the water in the hot well 41 to the tank 42. The valve V1 and the pump 9e may be connected to the control device 90 by wire or wirelessly so as to be able to communicate with each other, and may be controlled by the control device 90.

[0054] The valve V2 and the pump 9f are provided in the pipe P18. The valve V2 is capable of adjusting the water flow path area in the pipe P18, and allows or blocks the flow of water from the tank 42 to the hot well 41. The pump 9f sends the water in the tank 42 to the hot well 41. The valve V2 and the pump 9f may be connected to the control device 90 by wire or wirelessly so as to be able to communicate with each other, and may be controlled by the control device 90.

[0055] For example, if the proportion of ammonia in the fuel used in the boiler 2 increases, more ammonia needs to be vaporized in the vaporizer 5. In this case, more water is supplied from the condenser 4 to the vaporizer 5 for vaporization. Because the water in the hotwell 41 is circulated between the condenser 4 and the vaporizer 5, supplying a large amount of water from the condenser 4 to the vaporizer 5 leads to a large amount of water subsequently returning from the vaporizer 5 to the condenser 4. Also, an increase in the amount of cooled water may cause the temperature of the water to decrease in the condenser 4, further increasing the amount of water. In this case, the hotwell 41 may become full of water and be unable to accept additional water returning from the vaporizer 5.

[0056] Therefore, in this embodiment, the plant 100A is configured to pre-transfer some of the water in the hot well 41 to the tank 42 when an amount of liquid ammonia greater than a predetermined value is supplied from the tank 1 to the vaporizer 5.

[0057] Specifically, the processor 90a of the control device 90 receives a parameter indicative of the amount of liquid ammonia being delivered from the tank 1 to the vaporizer 5 from the third sensor S3 at predetermined intervals.

[0058] For example, the processor 90a may close the valve V1 to block the flow of water from the condenser 4 to the tank 42 if the value of the received parameter is lower than a predetermined value stored in the memory device 90b. In this case, the water in the hot well 41 is not transferred to the tank 42.

[0059] In contrast, if the value of the received parameter is equal to or greater than a predetermined value, the processor 90a may open the valve V1 to allow water to flow from the condenser 4 to the tank 42. In this case, the processor 90a controls the pump 9e to send water from the condenser 4 to the tank 42. With this configuration, a portion of the water in the hot well 41 is moved to the tank 42.

[0060] Furthermore, when returning the water in the tank 42 to the hot well 41, the processor 90a may open the valve V2 to allow the flow of water from the tank 42 to the hot well 41. In this case, the processor 90a controls the pump 9f to send water from the tank 42 to the condenser 4. With this configuration, at least a portion of the water in the tank 42 is returned to the hot well 41.

[0061] The plant 100A as described above has the same effect as the plant 100 according to the first embodiment. The plant 100A also includes a third sensor S3 that measures a parameter indicating the amount of liquid ammonia supplied from the tank 1 to the vaporizer 5, a tank 42 that is circulatorily connected to the condenser 4, a valve V1 that is provided between the condenser 4 and the tank 42 and that allows or blocks the flow of the first water from the condenser 4 to the tank 42, and a control device 90 that is communicatively connected to the third sensor S3 and the valve V1. The control device 90 is configured to control the valve V1 based on the parameter measured by the third sensor S3. With this configuration, a portion of the water in the hot well 41 can be moved to the tank 42. Therefore, when the amount of ammonia used is expected to increase and the amount of water in the condenser 4 is expected to increase, the risk of the hot well 41 becoming full of water can be reduced by moving a portion of the water in the hot well 41 to the tank 42 in advance.

[0062] Although the embodiments have been described above with reference to the accompanying drawings, the present disclosure is not limited to the above-described embodiments. It is clear that a person skilled in the art can think of various modified or altered examples within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present disclosure.

[0063] This disclosure relates to 2It could promote the use of ammonia leading to reduced emissions and, for example, contribute to Sustainable Development Goals (SDGs) 7 "Ensure access to affordable, reliable, sustainable and modern energy" and 13 "Take urgent action to combat climate change and its impacts". [Explanation of symbols]

[0064] 1 tank (1st tank) 2. Boiler 3. Steam turbine 4. Condenser 4A Surface Condenser 5. Carburetor 42 Tank (2nd Tank) 90 Control device 100 Thermal Power Plant 100A Thermal Power Plant P16 Piping (return line) S1 First sensor S2 Second sensor S3 Third Sensor V1 Valve

Claims

1. a first tank containing liquid ammonia; a boiler connected to the first tank and configured to burn a fuel containing ammonia; a steam turbine connected to the boiler and operated by steam from the boiler; a condenser connected to the steam turbine and configured to condense steam discharged from the steam turbine into water; A vaporizer disposed between the first tank and the boiler in the flow of ammonia, the vaporizer being circulatory connected to the condenser, heating liquid ammonia from the first tank with first water from the condenser, and returning the first water cooled by the liquid ammonia to the condenser; Equipped with The condenser includes a surface condenser that condenses the steam discharged from the steam turbine into water using second water from an outside and discharges the second water used for the condensation to the outside. Thermal power plant.

2. The thermal power plant according to claim 1 , wherein the second water is seawater or river water.

3. 3. The steam power plant according to claim 1, wherein a return line from the vaporizer to the condenser is connected to a portion of the condenser through which water vapor passes.

4. The thermal power plant according to claim 1 , wherein a return line from the vaporizer to the condenser is connected to a portion of the condenser through which the steam passes.

5. A first sensor that measures a vacuum degree in the portion of the condenser through which water vapor passes; a pump for delivering the second water to the surface condenser; a control device communicatively connected to the first sensor and the pump, the control device being configured to control the pump to adjust the amount of the second water based on the degree of vacuum measured by the first sensor; The thermal power plant according to claim 4 .

6. a second sensor for measuring a temperature of the first water passing through the return line; a pump for delivering the second water to the surface condenser; a control device communicatively connected to the second sensor and the pump, the control device being configured to control the pump to adjust an amount of the second water based on a temperature of the first water measured by the second sensor; The thermal power plant according to claim 4 .

7. a second sensor for measuring a temperature of the first water passing through the return line; The control device is communicatively connected to the second sensor and configured to control the pump to adjust the amount of the second water based on a temperature of the first water measured by the second sensor. The thermal power plant according to claim 5.

8. a third sensor for measuring a parameter indicative of the amount of liquid ammonia delivered from the first tank to the vaporizer; A second tank circulatingly connected to the condenser; a valve provided between the condenser and the second tank, the valve allowing or blocking a flow of the first water from the condenser to the second tank; a controller communicatively coupled to the third sensor and the valve, the controller configured to control the valve based on the parameter measured by the third sensor; and The thermal power plant according to claim 1 , 2 or 4 .

9. a third sensor for measuring a parameter indicative of the amount of liquid ammonia delivered from the first tank to the vaporizer; A second tank circulatingly connected to the condenser; a valve provided between the condenser and the second tank, the valve allowing or blocking a flow of the first water from the condenser to the second tank; a controller communicatively coupled to the third sensor and the valve, the controller configured to control the valve based on the parameter measured by the third sensor; and The thermal power plant according to claim 3 .

10. a third sensor for measuring a parameter indicative of the amount of liquid ammonia delivered from the first tank to the vaporizer; A second tank circulatingly connected to the condenser; a valve provided between the condenser and the second tank, the valve allowing or blocking a flow of the first water from the condenser to the second tank; Equipped with the controller is communicatively coupled to the third sensor and the valve and configured to control the valve based on the parameter measured by the third sensor. A thermal power plant according to any one of claims 5 to 7.

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