Steam Generator

Abstract

To stably generate dry steam in a configuration in which steam is generated by indirectly exchanging heat between steam and water via a heat transfer part.SOLUTION: A steam generating device 100 includes: a container 2 to which steam is supplied; a heat transfer pipe 3 (heat transfer part) having water flowing therein and disposed in the container 2 to exchange heat between steam and water; a preheater 5 heating water before the same is supplied to the heat transfer pipe 3; and a separator 6 separating water from steam flowing out from the heat transfer pipe 3. The container 2 includes: a steam space 21a in which steam is retained; and a storage part 21b storing drain obtained by condensing steam. The heat transfer pipe 3 is disposed in the container 2 so as to come into contact with the steam in the steam space 21a and the drain in the storage part 21b. The drain in the storage part 21b is supplied to the preheater 5 as a heat source for heating water.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The technology disclosed herein relates to a steam generating device. [Background technology]

[0002] Conventionally, steam generating devices are known that generate steam, separate water from the generated steam, and supply dry steam. For example, Patent Document 1 discloses a steam generating device that generates steam, separates water from the generated steam using a cyclone separator, and supplies dry steam. In this steam generating device, steam generated in a boiler is condensed in a liquid, and the condensed water is re-evaporated to generate steam. In this way, the steam generating device separates impurities contained in the steam generated in the boiler in the liquid, and generates steam with fewer impurities. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 4-366302 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in the steam generating device of Patent Document 1, steam generated in a boiler is mixed with a liquid, and the mixed liquid is re-evaporated to generate steam. Therefore, impurities separated in the liquid may be mixed again into the re-evaporated steam. From the viewpoint of improving the quality of steam, a configuration is conceivable in which steam is generated from water heated by indirectly exchanging heat through a heat transfer section such as a heat transfer tube without mixing the steam and water. In this configuration, by appropriately managing the quality of the water, high-quality steam can be generated regardless of the quality of the steam that serves as the heat source.

[0005] The technology disclosed herein has been made in consideration of these points, and its purpose is to stably generate dry steam in a configuration in which steam is generated by indirectly exchanging heat between steam and water via a heat transfer section. [Means for solving the problem]

[0006] The steam generating device disclosed herein comprises a container to which steam is supplied, a heat transfer section arranged within the container so that water flows through it and heat is exchanged between the steam and the water, a preheater that heats the water before it is supplied to the heat transfer section, and a separator that separates the water from the steam flowing out from the heat transfer section, the container being provided with a steam space in which the steam remains and a storage section that stores drainage formed when the steam is condensed, the heat transfer section being arranged within the container so as to be in contact with the steam in the steam space and the drainage of the storage section, and the preheater is supplied with the drainage of the storage section as a heat source for heating the water. Effect of the Invention

[0007] According to the steam generating device, dry steam can be generated stably. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a steam generating device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Exemplary embodiments will now be described in detail with reference to the accompanying drawings.

[0010] The steam generating device 100 heats water to generate steam, and separates the water from the generated steam to supply dry steam. The steam generating device 100 includes a heat exchanger 1 that exchanges heat between the water and the steam, a preheater 5 that heats the water before it is supplied to the heat exchanger 1, and a separator 6 that separates the water from the steam flowing out of the heat exchanger 1.

[0011] The heat exchanger 1 has a container 2 to which steam is supplied, and a heat transfer tube 3 arranged in the container 2 so that water flows through the heat transfer tube 3 and the heat transfer between the steam and the water is performed. The heat transfer tube 3 is an example of a heat transfer portion.

[0012] The container 2 is partitioned into a heat exchange chamber 21, a first header 22, and a second header 23. In this example, the container 2 is formed in a vertically elongated shape. That is, the container 2 has a longitudinal direction extending in the up-down direction. The first header 22 is formed in the lower part of the container 2, the second header 23 is formed in the upper part of the container 2, and the heat exchange chamber 21 is formed between the first header 22 and the second header 23.

[0013] A plurality of heat transfer tubes 3 are arranged in the heat exchange chamber 21. Water flows inside the heat transfer tubes 3. In this example, the heat transfer tubes 3 are so-called spiral tubes with a spiral groove formed in the tube wall. The heat transfer tubes 3 are arranged to extend in the vertical direction in the heat exchange chamber 21. Both ends of the heat transfer tubes 3 are connected to the first header 22 and the second header 23, respectively. Specifically, the lower end of the heat transfer tube 3 is connected to the first header 22. The upper end of the heat transfer tube 3 is connected to the second header 23.

[0014] The container 2 is connected to a steam supply pipe 41 that supplies steam into the container 2 and a drain pipe 42 that causes drain to flow out from the container 2. The steam supply pipe 41 and the drain pipe 42 are connected to the heat exchange chamber 21. The steam supplied from the steam supply pipe 41 to the heat exchange chamber 21 exchanges heat with water flowing through the heat transfer tube 3 and condenses to become drain. The drain is stored in the lower part of the heat exchange chamber 21. That is, the lower part of the heat exchange chamber 21 is a storage section 21b that stores drain. The space above the storage section 21b in the heat exchange chamber 21 is a steam space 21a in which steam is retained. The steam supply pipe 41 is connected to the steam space 21a. The drain pipe 42 is connected to the storage section 21b. The steam supply pipe 41 is provided with a steam valve 41a that adjusts the flow rate of steam flowing through the steam supply pipe 41. The heat transfer tube 3 is disposed in the heat exchange chamber 21 so as to be exposed to steam and partially immersed in drain.

[0015] A water level sensor 81 that detects the water level of the drain in the storage section 21b is provided in the container 2. The water level sensor 81 is an example of a storage amount sensor that detects the storage amount of the drain in the storage section 21b.

[0016] A water supply pipe 43 that supplies water flowing through the heat transfer tubes 3 and a first steam outflow pipe 44 through which steam flows out from the heat transfer tubes 3 are connected to the container 2. The water supply pipe 43 is in communication with the first header 22. The first steam outflow pipe 44 is in communication with the second header 23.

[0017] Pure water flows through the water supply pipe 43. A water valve 43c that adjusts the flow rate of the pure water is provided in the water supply pipe 43. Water is supplied from the water supply pipe 43 to the first header 22. The first header 22 temporarily stores the water to be supplied to the heat transfer tube 3. The water in the first header 22 flows into the heat transfer tube 3. The first header 22 is an example of a storage chamber.

[0018] The water from the first header 22 flows upward through the heat transfer tubes 3 from the lower ends of the heat transfer tubes 3. While flowing through the heat transfer tubes 3, the water receives heat from the steam in the heat exchange chamber 21 and evaporates into steam. The steam flows out from the upper ends of the heat transfer tubes 3 to the second header 23.

[0019] The second header 23 temporarily stores the steam flowing out from the heat transfer tubes 3. The steam in the second header 23 flows out to the first steam outflow pipe 44.

[0020] The water supply pipe 43 is provided with a preheater 5. The preheater 5 heats the water flowing through the water supply pipe 43. The water supply pipe 43 has an upstream pipe 43a located upstream of the preheater 5 and a downstream pipe 43b located downstream of the preheater 5. A water valve 43c is provided in the upstream pipe 43a.

[0021] The preheater 5 is supplied with the drain of the storage section 21b as a heat source. Specifically, a drain pipe 42 through which the drain flows out from the storage section 21b is connected to the preheater 5. The drain pipe 42 has an upstream pipe 42a that connects the container 2 and the preheater 5, and a downstream pipe 42b through which the drain flows out from the preheater 5. The downstream pipe 42b is provided with a drain valve 42c that adjusts the flow rate of the drain flowing through the drain pipe 42. The drain valve 42c is an example of a first valve.

[0022] In the preheater 5, the water flowing through the water supply pipe 43 and the drain flowing through the drain pipe 42 indirectly exchange heat without mixing with each other. That is, the heat of the drain flowing through the drain pipe 42 is transferred to the water flowing through the water supply pipe 43. As a result, the water flowing through the water supply pipe 43 is heated.

[0023] The first steam outlet pipe 44 is connected to the separator 6. The steam flowing through the first steam outlet pipe 44 may contain water. For example, the steam flowing out from the heat transfer tube 3 may contain water that did not evaporate while flowing through the heat transfer tube 3. While the steam is stored in the second header 23 or while flowing through the first steam outlet pipe 44, some of the steam may condense into water. The separator 6 separates water from the steam containing water, and causes the steam from which the water has been separated, i.e., dry steam, to flow out.

[0024] The separator 6 separates the steam and the water by utilizing the flow rate of the steam and the water. Specifically, the separator 6 separates the steam and the water by utilizing the centrifugal force acting on the steam and the water. In this example, the separator 6 is a cyclone type separator. The separator 6 has a container 61 and a separator body 62. The container 61 is divided into an upstream space 61a and a downstream space 61b by the separator body 62. The first steam outflow pipe 44 is connected to the container 61, specifically, to the upstream space 61a. The separator body 62 has a swirling flow path 63 and an outflow pipe 64. A plurality of swirling flow paths 63 are formed on the outer periphery of the outflow pipe 64. The upstream end of the swirling flow path 63 opens into the upstream space 61a. The downstream end of the swirling flow path 63 opens into the downstream space 61b. The upstream end of the outflow pipe 64 opens into the downstream space 61b. A second steam outlet pipe 65 is connected to the downstream end of the outlet pipe 64. The second steam outlet pipe 65 extends to the outside of the container 61. The second steam outlet pipe 65 is an example of a steam outlet pipe.

[0025] The steam from the first steam outflow pipe 44 flows into the upstream space 61a, and then flows into the swirling flow passage 63. The swirling flow passage 63 swirls the steam containing water. The steam containing water flows out of the swirling flow passage 63 as a swirling flow. A relatively upper portion of the downstream space 61b is a space for the steam containing water flowing out of the swirling flow passage 63 to swirl. The steam containing water is subjected to a centrifugal force by the swirling flow. A larger centrifugal force is applied to water (e.g., water droplets) that has a larger specific gravity than steam, and as a result, the water is separated from the steam. The separated water accumulates in the lower portion of the downstream space 61b. The steam from which the water has been separated, i.e., dry steam, flows into the outflow pipe 64 and flows upward through the outflow pipe 64. The dry steam flows from the outflow pipe 64 into the second steam outflow pipe 65 and flows through the second steam outflow pipe 65.

[0026] A return pipe 28 that discharges the water separated by the separator 6 is connected to the downstream space 61b. The downstream end of the return pipe 28 is connected to the first header 22. The return pipe 28 is provided with a check valve 28a that allows flow toward the first header 22 while blocking flow from the first header 22. Water that accumulates in the lower part of the downstream space 61b flows into the first header 22 via the return pipe 28.

[0027] The second steam outlet pipe 65 is provided with a pressure sensor 82 that detects the pressure of steam flowing through the second steam outlet pipe 65. The second steam outlet pipe 65 is provided with a steam valve 65a that adjusts the flow rate of steam flowing through the second steam outlet pipe 65. The steam valve 65a is an example of a second valve.

[0028] The steam generating device 100 further includes a first control unit 71 that controls the drain valve 42c. In addition, the steam generating device 100 further includes a second control unit 72 that controls the steam valve 65a.

[0029] The first control unit 71 has a calculation unit formed by a processor such as a CPU, and a storage unit formed by a ROM, a RAM, etc. The storage unit stores information such as various programs and various data. The calculation unit controls the drain valve 42c by reading and executing software such as programs stored in the storage unit.

[0030] Similarly, the second control unit 72 has a calculation unit formed by a processor such as a CPU, and a storage unit formed by a ROM, a RAM, etc. The storage unit stores information such as various programs and various data. The calculation unit controls the steam valve 65a by reading and executing software such as programs stored in the storage unit.

[0031] Specifically, the first control unit 71 adjusts the amount of drain stored in the storage unit 21b by controlling the drain valve 42c. The detection result of the water level sensor 81 is input to the first control unit 71. The first control unit 71 adjusts the amount of drain stored in the storage unit 21b by controlling the drain valve 42c based on the detection result of the water level sensor 81.

[0032] The amount of drainage stored in the storage section 21b is correlated with the area of ​​the portion of the heat transfer tube 3 exposed to the steam in the steam space 21a (i.e., the heat transfer area of ​​the heat transfer tube 3 with steam). In other words, when the amount of drainage stored in the storage section 21b decreases, the heat transfer area of ​​the heat transfer tube 3 with steam increases. The amount of heat transferred from the steam to the water flowing through the heat transfer tube 3 depends on the heat transfer area of ​​the heat transfer tube 3 with steam and the flow rate of the water flowing through the heat transfer tube 3. A certain amount of heat is required to evaporate the water flowing through the heat transfer tube 3. When the heat transfer area of ​​the heat transfer tube 3 with steam is small, it is necessary to increase the flow rate of the water flowing through the heat transfer tube 3 in order to secure the necessary amount of heat to evaporate the water. When the flow rate of the water flowing through the heat transfer tube 3 increases, the flow rate of the steam passing through the separator 6 also increases. When the flow rate of the steam passing through the separator 6 increases, there is a risk that the separation efficiency of the steam and water in the separator 6 decreases.

[0033] Therefore, the first control unit 71 controls the opening degree of the drain valve 42c so that the amount of drain stored in the storage unit 21b falls within a predetermined range (a range between a predetermined upper limit and a predetermined lower limit). Specifically, the first control unit 71 increases the opening degree of the drain valve 42c so that the amount of drain stored does not exceed the predetermined upper limit, and decreases the opening degree of the drain valve 42c so that the amount of drain stored does not fall below the predetermined lower limit.

[0034] For example, the first control unit 71 continuously adjusts the opening of the drain valve 42c so that the opening increases as the amount of drain increases. Alternatively, the first control unit 71 may adjust the opening of the drain valve 42c in stages so that the opening increases as the amount of drain increases. For example, the first control unit 71 may set the opening of the drain valve 42c to a relatively large first opening when the amount of drain is greater than the first storage amount (<upper limit value), set the opening of the drain valve 42c to a second opening smaller than the first opening when the amount of drain is equal to or less than the first storage amount and equal to or greater than the second storage amount (>lower limit value), and set the opening of the drain valve 42c to a third opening smaller than the second opening when the amount of drain is smaller than the second storage amount.

[0035] Furthermore, the drain discharged from the reservoir 21b is supplied to the preheater 5 and is used to heat the water supplied to the heat transfer tube 3. This promotes evaporation of the water flowing through the heat transfer tube 3.

[0036] Further, the second control unit 72 adjusts the pressure of the steam flowing out from the first steam outflow pipe 44 by controlling the steam valve 65a. The detection result of the pressure sensor 82 is input to the second control unit 72. The second control unit 72 adjusts the pressure of the steam flowing out from the first steam outflow pipe 44 to a predetermined pressure by controlling the steam valve 65a based on the detection result of the pressure sensor 82.

[0037] In the steam generating device 100 configured in this manner, the water flowing through the heat transfer tube 3 and the steam that heats the water perform heat exchange indirectly without being mixed, so the quality of the steam generated by evaporating the water in the heat transfer tube 3 is not affected by the quality of the steam that serves as the heat source. In this example, the water supplied to the heat transfer tube 3 is pure water, so high-quality steam is generated.

[0038] In addition, since the amount of drain stored in the storage portion 21b is adjusted to a predetermined range, the heat transfer area of ​​the heat transfer tube 3 with the steam is ensured to be within a certain range. This makes it possible to reduce the flow rate of the water flowing through the heat transfer tube 3 while providing the amount of heat required for evaporation from the steam to the water in the heat transfer tube 3. As a result, it is possible to prevent a decrease in the separation efficiency of the steam and water in the separator 6 while appropriately evaporating the water flowing through the heat transfer tube 3. This allows the steam generating device 100 to stably supply dry steam.

[0039] Furthermore, the drain in the storage section 21b is formed by condensing steam in the heat exchange chamber 21, and is at a relatively high temperature. By supplying the drain discharged from the storage section 21 to the preheater 5, the heat of the drain can be effectively utilized. Furthermore, when the drain in the storage section 21b is discharged, it is desirable to increase the efficiency of heat transfer from the steam to the water in the heat transfer tube 3, that is, to promote the evaporation of water in the heat transfer tube 3. In such a situation, the water before being supplied to the heat transfer tube 3 is heated by utilizing the heat of the drain in the storage section 21b, so that the evaporation of water in the heat transfer tube 3 is further promoted.

[0040] As described above, the steam generating device 100 comprises a container 2 to which steam is supplied, a heat transfer tube 3 (heat transfer section) arranged within the container 2 so that water flows through it and heat is exchanged between the steam and the water, a preheater 5 that heats the water before it is supplied to the heat transfer tube 3, and a separator 6 that separates the water from the steam flowing out from the heat transfer tube 3. The container 2 is provided with a steam space 21a in which the steam remains and a storage section 21b that stores drainage water formed when the steam is condensed. The heat transfer tube 3 is arranged within the container 2 so as to be in contact with the steam in the steam space 21a and the drainage water in the storage section 21b. The preheater 5 is supplied with the drainage water from the storage section 21b as a heat source for heating the water.

[0041] According to this configuration, the drain in the storage section 21b is supplied to the preheater 5, and thus the amount of drain stored in the storage section 21b is reduced. When the amount of drain stored is reduced, the area of ​​the portion of the heat transfer tube 3 exposed to the steam in the steam space 21a, i.e., the heat transfer area of ​​the heat transfer tube 3 with the steam, is enlarged. This allows water to be appropriately evaporated in the heat transfer tube 3 without increasing the flow rate of the water flowing through the heat transfer tube 3. In addition, the drain discharged from the storage section 21b is used in the preheater 5 to heat the water before it is supplied to the heat transfer tube 3. This makes it easier for water to evaporate in the heat transfer tube 3.

[0042] In this way, by supplying the drain of the storage section 21b to the preheater 5, the heat transfer area of ​​the heat transfer tube 3 with the steam is expanded, and the temperature of the water supplied to the heat transfer tube 3 is increased, which synergistically facilitates evaporation of the water in the heat transfer tube 3. This makes it possible to suppress the flow rate of the water flowing through the heat transfer tube 3, thereby suppressing the flow rates of the steam and water passing through the separator 6 and preventing a decrease in the separation efficiency of the steam and water in the separator 6. As a result, the steam generating device 100 can stably supply dry steam.

[0043] In addition, the steam generating device 100 further includes a drain valve 42c (first valve) that adjusts the amount of drain supplied from the storage section 21b to the preheater 5, and a first control section 71 that controls the drain valve 42c, and the first control section 71 adjusts the amount of drain stored in the storage section 21b by controlling the drain valve 42c.

[0044] According to this configuration, the first control unit 71 adjusts the heat transfer area of ​​the heat transfer tube 3 with the steam and the amount of heat of the water before it is supplied to the heat transfer tube 3. For example, when the flow rate of the water flowing through the heat transfer tube 3 is set to an extent that the separation efficiency of the steam and the water in the separator 6 is appropriately ensured, the first control unit 71 can adjust the heat transfer area of ​​the heat transfer tube 3 with the steam and the amount of heat of the water before it is supplied to the heat transfer tube 3 so that the water in the heat transfer tube 3 is appropriately evaporated.

[0045] Furthermore, the steam generating device 100 further includes a water level sensor 81 (storage amount sensor) that detects the amount of drain stored in the storage portion 21b, and the first control portion 71 adjusts the amount of drain stored in the storage portion 21b based on the detection result of the water level sensor 81.

[0046] According to this configuration, the first control unit 71 can grasp the heat transfer area of ​​the heat transfer tube 3 with the steam based on the detection result of the water level sensor 81. As a result, the first control unit 71 can accurately adjust the heat transfer area of ​​the heat transfer tube 3 with the steam.

[0047] In addition, a drain pipe 42 for draining the drain from the storage section 21b is connected to the container 2, and the drain pipe 42 is connected to a preheater 5. A water supply pipe 43 for supplying water to the heat transfer tube 3 is connected to the heat transfer tube 3, and the preheater 5 is configured to heat the water circulating through the water supply pipe 43.

[0048] According to this configuration, drain flows out from the container 2 through the drain pipe 42. Water heated by the preheater 5 is supplied to the heat transfer tube 3 through the water supply pipe 43. The drain from the container 2 is supplied to the preheater 5 through the drain pipe 42 as a heat source.

[0049] Furthermore, the container 2 is formed with a first header 22 (storage chamber) in which the water to be supplied to the heat transfer tube 3 is temporarily stored, and a return pipe 28 is connected to the first header 22 to return the water separated by the separator 6.

[0050] According to this configuration, the water separated from the steam by the separator 6 is returned to the first header 22 via the return pipe 28. The water returned to the first header 22 is supplied again to the heat transfer tubes 3. The water separated in the separator 6 is at a relatively high temperature since it was originally mixed with the steam, and is also of high quality since it is pure water originally supplied via the water supply pipe 43. In other words, high-temperature, high-quality water can be effectively used to generate steam.

[0051] The steam generating device 100 also includes a second steam outlet pipe 65 connected downstream of the separator 6, a pressure sensor 82 that detects the pressure of steam flowing through the second steam outlet pipe 65, a steam valve 65a (second valve) that adjusts the flow rate of steam flowing through the second steam outlet pipe 65, and a second control unit 72 that controls the steam valve 65a, and the second control unit 72 adjusts the pressure of steam flowing out from the second steam outlet pipe 65 by controlling the steam valve 65a based on the detection result of the pressure sensor 82.

[0052] According to this configuration, the pressure of the steam flowing out through the second steam outflow pipe 65 is adjusted by the second control unit 72.

[0053] Other Embodiments As described above, the above embodiment has been described as an example of the technology disclosed in this application. However, the technology in this disclosure is not limited to this, and can be applied to embodiments in which modifications, replacements, additions, omissions, etc. are appropriately performed. In addition, it is also possible to combine the components described in the above embodiment to form a new embodiment. In addition, among the components described in the attached drawings and detailed description, not only components essential for solving the problem but also components that are not essential for solving the problem in order to exemplify the technology may be included. Therefore, the fact that these non-essential components are described in the attached drawings and detailed description should not immediately be taken to mean that these non-essential components are essential.

[0054] For example, the heat transfer portion is not limited to the above-mentioned heat transfer tube 3. The heat transfer tube 3 may be a straight tube or a tube formed in a coil shape. Furthermore, the heat transfer portion may be a plate-type heat exchanger.

[0055] The separator is not limited to the above-mentioned separator 6. The separator may have any configuration as long as it can separate steam and water by utilizing the flow rates of the steam and water.

[0056] The first control unit 71 and the second control unit 72 may be formed as a single control unit. In other words, a common control unit may control the drain valve 42c and the steam valve 65a.

[0057] The positions of the various valves are not limited to those described above. For example, the drain valve 42c may be provided in the upstream pipe 42a. [Explanation of symbols]

[0058] 100 Steam Generator 2 containers 21a Steam Space 21b Storage section 22 First header (storage chamber) 28 Return pipe 3 Heat transfer tube (heat transfer section) 41 Steam supply pipe 42 Drain pipe 42c Drain valve (first valve) 43 Water supply pipe 5 Preheater 6 Separator 65 Second steam outflow pipe (steam outflow pipe) 65a Steam valve (second valve) 71 First Control Section 72 Second Control Section 81 Water level sensor (storage volume sensor) 82 Pressure Sensor

Claims

1. a vessel to which steam is supplied and which is provided with a steam space in which the steam remains and a storage section in which drain resulting from condensation of the steam is stored; a heat transfer section disposed within the container so as to allow water to flow therethrough and to exchange heat between the steam and the water; a preheater that receives drainage from the storage section as a heat source and heats water before it is supplied to the heat transfer section; a separator that separates water from steam flowing out from the heat transfer portion; a first valve that adjusts the amount of drain supplied from the reservoir to the preheater; a drain amount sensor that detects the amount of drain in the storage portion; a first control unit that controls the first valve, the heat transfer section is disposed within the vessel so as to be in contact with the steam in the steam space and the drain of the reservoir; The first control unit adjusts the amount of drain stored in the storage unit to be between a predetermined upper limit value and a predetermined lower limit value by controlling the first valve based on the detection result of the storage volume sensor.

2. 2. The steam generating device according to claim 1, A drain pipe for discharging drain from the storage portion is connected to the container, the drain pipe is connected to the preheater; A water supply pipe that supplies water to the heat transfer section is connected to the heat transfer section, The preheater is configured to heat water flowing through the water supply pipe.

3. A single container to which steam is supplied; a heat transfer section disposed within the container so as to allow water to flow therethrough and to exchange heat between the steam and the water; A preheater that heats water before it is supplied to the heat transfer section; a separator that separates water from steam flowing out from the heat transfer portion, The container is provided with a steam space in which steam remains and a storage section in which drainage resulting from condensation of the steam is stored, the heat transfer section is disposed within the vessel so as to be in contact with the steam in the steam space and the drain of the reservoir; The preheater is supplied with the drain of the reservoir as a heat source for heating water, The container has a storage chamber in which water to be supplied to the heat transfer section is temporarily stored, A steam generating device in which a return pipe for returning the water separated by the separator is connected to the storage chamber.

4. The steam generating device according to any one of claims 1 to 3, a steam outlet pipe connected to the downstream side of the separator; a pressure sensor for detecting a pressure of the steam flowing through the steam outlet pipe; a second valve for adjusting a flow rate of steam flowing through the steam outlet pipe; A second control unit that controls the second valve, The second control unit is a steam generating device that adjusts the pressure of the steam flowing out from the steam outflow pipe by controlling the second valve based on a detection result of the pressure sensor.

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