JP2012087989A - Steam supply apparatus and steam supply system using solar heat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam supply apparatus and a steam supply system capable of stably generating steam.SOLUTION: The apparatus for supplying steam to a heating apparatus 3 includes an accumulator 33 accumulating steam boiled by solar heat, a steam pipe 36 for supplying the steam accumulated in the accumulator 33 to the heating apparatus 3, and a vacuum pump 61 reducing the pressure in the steam pipe 36 to induce a boiling state. The vacuum pump 61 reduces the pressure in the steam pipe 36 only when a boiling point of steam is lower than a boiling point at atmospheric pressure. Thus, steam can be always stably supplied to the heating apparatus 3.

Description

  The present invention relates to a steam supply device and a steam supply system using solar heat.

  As a method of utilizing solar heat, a method of making hot water of 30 to 80 ° C. with a solar water heater is generally known. Such use of solar heat has long been adopted in detached houses and buildings with hot water demand such as pools, old health, and hospitals. However, in factories, there is little demand for heat in the temperature range of 30 to 80 ° C., and there are few cases of using solar heat despite having a large roof area.

  On the other hand, food factories (heating, boiling, etc.), chemical factories (distillation, decomposition, softening molding, etc.), semiconductor factories (pure water heating, air conditioning reheating, etc.), hospitals (sterilization, humidification, etc.), absorption refrigerators -In buildings and the like having a central heating system, heat of 100 to 150 ° C. is in widespread demand. Therefore, in these buildings, it is common to install a boiler and supply low-pressure steam.

  By the way, as a collector for producing steam by solar heat, a method of collecting sunlight reflected by a rotating parabolic mirror and a number of plane mirrors (a point concentrating type heat collecting device), a vertical parabolic mirror, or the like. There is known a method (line condensing type heat collecting device) for collecting sunlight reflected by a heat collecting tube provided at its focal point. In either case, heat is generally stored for stable steam production. As the heat storage medium, sensible heat such as oil having a boiling point higher than that of water and latent heat such as polyhydric alcohols have been proposed. However, these methods have drawbacks that the system is complicated and expensive, and it is difficult to separate and recycle the heat storage material at the time of disposal. On the other hand, some systems that collect water by using water as a heat storage medium and generating steam by solar heat are also disclosed (see Patent Documents 1 and 2).

JP 2006-266331 A JP 2008-170138 A

  However, solar heat is unstable and it is not enough to meet demand.

  This invention is made | formed in view of this point, and it aims at providing the vapor | steam supply apparatus and vapor | steam supply system which can generate | occur | produce a vapor | steam stably with high efficiency from the unstable and insufficient solar heat. To do.

  In order to achieve the above object, according to the present invention, there is provided an apparatus for supplying steam to a thermal apparatus, the accumulator for storing steam boiled by solar heat, and the steam stored in the accumulator to the thermal apparatus. A steam pipe to be supplied and a vacuum pump that creates a boiling state by reducing the pressure inside the steam pipe, and the vacuum pump reduces the pressure inside the steam pipe only when the boiling point of the steam is lower than the boiling point at atmospheric pressure. A steam supply device using solar heat is provided.

  The steam supply device includes a heat collector that produces steam by boiling water with solar heat, steam generated by the heat collector is supplied to the accumulator, and water is stored in the accumulator. Steam generated in the heater may be supplied into the accumulator water.

  Further, according to the present invention, an existing steam supply device that supplies steam produced by a boiler to the thermal device is provided, and steam produced by the steam supply device is preferentially supplied to the thermal device. A steam supply system is provided. In this steam supply system, a part of the return water returned from the thermal device to the boiler may be returned to the accumulator of the steam supply device.

According to the present invention, by depressurizing the inside of the steam pipe with a vacuum pump, a boiling state with high thermal conductivity can be created in the heat collecting section, and solar heat can be collected with high efficiency. Moreover, steam produced by solar heat can be stored using water that is cheap, safe and easy to dispose of, and low-pressure steam can be stably supplied from unstable solar heat. In addition, when the steam supply device of the present invention is introduced into a building equipped with an existing steam supply device that supplies steam produced by a boiler to the thermal equipment, the steam produced by the steam supply device of the present invention has priority over the thermal equipment. By supplying to the boiler, it is possible to reduce the fuel cost and CO ₂ emission of the boiler required for steam production.

It is explanatory drawing which shows schematic structure of the steam supply system which combined the steam supply apparatus concerning this Embodiment with the existing steam supply apparatus. It is explanatory drawing which shows schematic structure of the vapor | steam supply system concerning Embodiment which integrated the vacuum pumps, the pressure-reduction valve, and the safety valve, and installed in the heat collection part vicinity. It is explanatory drawing which shows schematic structure of the vapor | steam supply system concerning Embodiment which integrated the vacuum pumps, the pressure-reduction valve, the safety valve, and the feed water pumps in the heat collecting part vicinity.

  Embodiments of the present invention will be described below. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  As shown in FIG. 1, the building 1 includes an existing steam supply device 4 that supplies steam produced by the boiler 2 to a plurality of thermal devices 3. Building 1 is a food factory that performs heating, boiling, etc., a chemical factory that performs distillation, decomposition, softening molding, etc., a semiconductor factory that performs pure water heating, air conditioning reheating, etc., a hospital that performs sterilization, humidification, etc. For example, buildings with absorption refrigerators and central heating facilities. The thermal apparatus 3 is a heating apparatus, a molding apparatus, a sterilization apparatus, or other various thermal apparatuses installed in these buildings 1. In these buildings 1, there is a wide demand for warm heat (steam) at 100 to 150 ° C. to supply the thermal equipment 3.

  This building 1 is provided with a steam supply device 10 according to an embodiment of the present invention in addition to the existing steam supply device 4. Thus, the steam supply system 5 according to the embodiment of the present invention is configured by combining the steam supply apparatus 10 with the existing steam supply apparatus 4. In this steam supply system 5, as will be described in detail later, the steam produced by the steam supply device 10 is supplied to the thermal equipment 3 with priority over the existing steam supply device 4.

  First, the existing steam supply device 4 will be described. The existing steam supply device 4 includes a boiler 2 that burns fuel to produce high-pressure steam. The high-pressure steam produced by the boiler 2 is supplied to the high-pressure steam header 12 through the main pipe 11. A high-pressure steam system pipe 9 and an existing high-pressure side pipe 13 are connected to the high-pressure steam header 12, and the high-pressure steam system pipe 9 is connected to a high-pressure steam system such as a turbine already installed in the building 1. High-pressure steam is supplied to the high-pressure steam system from the high-pressure steam header 12 through the high-pressure steam system pipe 9.

  On the other hand, the existing high-pressure side pipe 13 is connected to the thermal equipment 3 via the existing low-pressure side pipe 14 downstream from the pressure reducing valve 15. The high-pressure steam that has flowed from the high-pressure steam header 12 into the existing high-pressure side pipe 13 is decompressed by the pressure reducing valve 15 to become low-pressure steam, and is supplied to the thermal equipment 3 through the existing low-pressure side pipe 14. High-pressure steam is steam of 0.1 [MPa (G)] (about 120 ° C.) or higher, and low-pressure steam is steam of less than 0.1 [MPa (G)]. In factories and the like, it is common to produce high-pressure steam with the boiler 2 and to reduce the pressure to the required pressure before any equipment that requires high pressure.

  Pressure sensors 16 and 17 are respectively attached to the existing high-pressure side pipe 13 and the existing low-pressure side pipe 14 before and after the pressure reducing valve 15. The pressure sensor 16 detects the pressure P5 of the high pressure steam flowing from the high pressure steam header 12 into the existing high pressure side pipe 13. Further, the pressure sensor 17 detects the pressure P4 of the low-pressure steam decompressed by the decompression valve 15.

  The water used for heating in the heat device 3 and condensed is returned to the return water tank 21 through the existing return water pipe 20. The return water tank 21 is also supplied with water softened by the water softener 22 (clean water). The water stored in the return water tank 21 is supplied to the boiler 2 through the existing supply pipe 23 as boiler supply water. Then, high-pressure steam produced in the boiler 2 by fuel combustion is supplied to the main pipe 11.

Next, the steam supply apparatus 10 concerning embodiment of this invention is demonstrated. The steam supply device 10 includes a plurality of heat collectors 30 that make steam by boiling the water filled in the heat collecting tubes 31 using solar heat. The heat collector 30 is preferably a line condensing type in which a high temperature is obtained by condensing the heat collecting tube 31 and the sun tracking is not required. In order to increase the amount of heat collected, the heat collector 30 is installed facing south (Northern Hemisphere) and at the same inclination as the latitude. Considering the size of the conventional solar water heater, it is desirable that the size of the heat collector 30 is 2 m ^L × 1 m ^W as one module.

  Steam produced by boiling in the heat collector 30 is sent to an accumulator 33 through a steam pipe 32. The accumulators 33 are provided in the upper portions of the respective heat collectors 30 so that the steam generated in the respective heat collectors 30 is collected in the respective accumulators 33. The heat collecting tube 31 is made so as not to rise and fall so that the steam generated therein moves smoothly to the accumulator 33.

The accumulator 33, 2m against ^L × 1 m ^W heat collector 30 the size of the same it is desirable to a cylindrical container having an inner diameter of about 250mm in width. This shape is a capacity that can store heat for about 1 hour when the solar radiation conditions are good, it is advantageous in terms of pressure resistance, is easy to integrate with the heat collector 30, and is within the application range of small pressure vessels with loose legal regulations. There is an advantage that it is. In order to reduce heat dissipation loss, it is desirable to insulate the outside.

  A ball tap 34 is provided inside the accumulator 33, and when the water surface height L1 is insufficient, water is supplied to the accumulator 33 from the return water pipe 35. A steam pipe 32 is disposed below the accumulator 33, extends in the longitudinal direction of the accumulator 33, and is provided with a large number of small holes (not shown). The steam that has boiled in the heat collecting pipe 31 and has risen through the steam pipe 32 becomes fine bubbles through the small holes and spreads evenly in the water of the accumulator 33 to uniformly heat the entire water. A return water pipe 29 is connected to the bottom of the accumulator 33, and the other end is connected to the lowermost part of the heat collection pipe 31. When steam is generated and rises in the heat collection pipe 31, water is supplied to the heat collection pipe 31. Fill and continue boiling.

  The accumulator 33 is connected to one end of a return water pipe 35 and one end of a low-pressure steam pipe 36 that is an outgoing pipe that supplies steam to the thermal equipment 3. The other end of the return water pipe 35 is connected in the middle of the existing return water pipe 20 that connects the thermal device 3 and the return water tank 21 of the existing steam supply device 4. That is, the return water pipe 35 communicates with the thermal equipment 3 by sharing a part of the pipe line (the existing return water pipe 20) with the existing steam supply device 4. The return water pipe 35 is provided with a strainer 37, a water supply pump 38, a check valve 39, a pressure sensor 40, and the like. The pressure sensor 40 detects the pressure P1 of water fed to the return water pipe 35 by the operation of the water supply pump 38.

  The other end of the low-pressure steam pipe 36 is connected in the middle of the existing low-pressure side pipe 14 provided in the existing steam supply device 4. The low-pressure steam pipe 36 is provided with a temperature sensor 49, a strainer 50, a check valve 51, a pressure reducing valve 52, a pressure sensor 53, and the like. The temperature sensor 49 detects the temperature T of the steam in the low-pressure steam pipe 36. The pressure sensor 53 detects the pressure P3 of the steam that is decompressed by the pressure reducing valve 52 and is supplied from the low pressure steam pipe 36 to the existing low pressure side pipe 14.

  A decompression pipe 55 is connected to the low-pressure steam pipe 36, and a pressure sensor 60, a vacuum pump 61, a check valve 62, an electromagnetic valve 63 and the like are attached to the decompression pipe 55. Further, the pressure sensor 60 detects the pressure P2 in the low-pressure steam pipe 36 (pressure P2 in the low-pressure steam pipe 36 before being decompressed by the pressure reducing valve 52).

  The feed water pump 38 operates so that the pressure P1 is higher than the pressure P3 by the minimum ball tap operating pressure. The water supply pump 38 sucks a part of the return water flowing in the existing return water pipe 20 connecting the thermal device 3 and the return water tank 21 through the return water pipe 35 and sends the water to the accumulator 33. Or you may make it the water supply pump 38 suck | inhale the water (not shown) by which the soft water process was carried out separately, and may send it to the accumulator 33. FIG. Thus, water is accumulated in the accumulator 33 up to the water surface height L1.

  By opening the electromagnetic valve 63 and operating the vacuum pump 61, the inside of the low-pressure steam pipe 36 can be decompressed by forcibly exhausting the inside of the low-pressure steam pipe 36 through the decompression pipe 55. The vacuum pump 61 has a required ultimate pressure of about 10 [kPa], and exhausts a gas containing steam and water droplets. Therefore, a water-sealed vacuum pump is desirable. Once the inside of the low-pressure steam pipe 36 or the heat collecting pipe 31 is depressurized, the amount of exhaust during operation is small, so a model with low exhaust speed and low power consumption is sufficient.

  Since the water-sealed vacuum pump requires makeup water, a part of the water sent to the return water pipe 35 or water that has been subjected to soft water treatment is used. When using return water, it is preferable to provide a replenishment water tank 45, a bypass pipe 46 that supplies water to the replenishment water tank 45 from the return water pipe 35, and a pipe 64 that replenishes the vacuum pump 61 with water from the replenishment water tank 45. The replenishing water tank 45 is provided with a ball tap 47. When the water tap height L2 is insufficient, the ball tap 47 is operated so that water is supplied from the bypass pipe 46 to the replenishing water tank 45. Water is stored up to the water surface height L2.

  Further, a decompression pipe 55 and a leak pipe 56 are connected in the middle of the low pressure steam pipe 36. A safety valve 57 is attached to the leak pipe 56, and when the pressure of the steam in the low-pressure steam pipe 36 exceeds an allowable range, the steam is leaked to the outside through the leak pipe 56.

  The operation of the vacuum pump 61 and the opening and closing of the electromagnetic valve 63 are controlled by the control unit 65. The controller 65 includes the temperature T of the steam in the low-pressure steam pipe 36 detected by the temperature sensor 49 and the pressure P2 in the low-pressure steam pipe 36 detected by the pressure sensor 60 (before the pressure is reduced by the pressure reducing valve 52). The pressure P2) in the low-pressure steam pipe 36 is input, and the operation of the vacuum pump 61 and the opening / closing of the electromagnetic valve 63 are controlled based on the detected values T and P2.

  When the steam supply system 5 is started, the electromagnetic valve 63 is opened and the vacuum pump 61 is operated until the pressure P2 in the low-pressure steam pipe 36 becomes equal to or lower than a certain level. By this operation, the inside of the low-pressure steam pipe 36 is forcibly exhausted through the decompression pipe 55, and the air from the system of the existing steam supply device 4 (low-pressure steam pipe 36, accumulator 33, return water pipe 35, heat collecting pipe 31, steam pipe 32). Is removed, and mixing of air into the existing low-pressure side pipe 14 is prevented.

  After the start of the steam supply system 5, when the boiling point of the steam in the low-pressure steam pipe 36 is lower than the boiling point at atmospheric pressure, the inside of the low-pressure steam pipe 36 is forcibly exhausted through the decompression pipe 55. Reduce the pressure to about the saturation pressure. That is, when the temperature T detected by the temperature sensor 49 is less than 100 ° C., the control unit 65 opens the electromagnetic valve 63 so that the pressure P2 detected by the pressure sensor 60 is equal to or lower than the saturation pressure of the temperature T. The operation of the vacuum pump 61 is controlled. For example, when the temperature T is 45 ° C., the operation of the vacuum pump 61 is controlled so that the pressure P2 is about 10 [kPa], and when the temperature T is 60 ° C., the pressure P2 is about 20 [kPa]. The operation of the vacuum pump 61 is controlled.

  When the water temperature inside the accumulator 33 is lower than the water temperature inside the heat collecting pipe 31, boiling occurs in the heat collecting pipe 31, and the steam rises to the accumulator 33 through the steam pipe 32, thereby increasing the water temperature inside the accumulator 33. At this time, air bubbles are continuously generated on the inner wall of the heat collecting tube, and the inside of the heat collecting tube is forcibly stirred. high. On the contrary, when the water temperature inside the accumulator 33 is higher than the water temperature inside the heat collecting tube 31, boiling does not occur inside the heat collecting tube 31, and the accumulator 33 is above the heat collecting tube 31 and natural convection does not occur. Therefore, when the accumulator 33 is appropriately kept warm, little heat is dissipated.

  On the other hand, when the temperature T of the steam in the low-pressure steam pipe 36 is higher than the boiling point (about 100 ° C.) at atmospheric pressure, the electromagnetic valve 63 is closed and the vacuum pump 61 is stopped. As the amount of solar radiation increases, the temperature of the water in the accumulator 33 rises due to the steam from the heat collecting pipe 31, and the pressure P2 in the low-pressure steam pipe 36 detected by the pressure sensor 60 also rises. During this time, the vapor from the accumulator 33 is stored in the state of saturated water inside the accumulator 33.

  On the other hand, in the existing steam supply device 4 installed in advance in the building 1, the steam produced by the boiler 2 is divided by the high-pressure steam header 12 and decompressed by the decompression valve 15, and becomes low-pressure steam. To be supplied. As described above, the thermal equipment 3 can be supplied with low-pressure steam from both the newly installed steam supply system 5 and the existing steam supply device 4 installed in the building 1 in advance.

  Here, the steam supply device 10 is set to supply steam to the thermal equipment 3 with priority over the existing steam supply device 4. That is, the setting of the pressure reducing valve 15 provided in the existing low pressure side pipe 14 of the existing steam supply device 4 and the setting of the pressure reducing valve 52 provided in the low pressure steam pipe 36 of the steam supply system 5 are the same as the existing low pressure side pipe. 14 is determined such that the pressure P3 of the steam supplied to 14 is slightly larger than the pressure P4 decompressed by the pressure reducing valve 15 of the existing steam supply device 4 (P3> P4).

  When the amount of solar radiation increases and the pressure P <b> 2 exceeds the set value of the pressure P <b> 3, the vapor evaporated from the water surface of the accumulator 33 starts to be supplied to the thermal equipment 3 through the low pressure steam pipe 36 and the pressure reducing valve 52. Even if the amount of solar radiation decreases, as long as the water temperature inside the accumulator 33 is high and the pressure P2 exceeds the set value of the pressure P3, it is continuously supplied to the thermal equipment 3. In this way, fluctuations in the amount of solar radiation are absorbed by the accumulator 33, and low-pressure steam having a constant pressure (set value of the pressure P3) created by solar heat is supplied from the steam supply device 10 to the thermal equipment 3 continuously for a long time. .

  Since the steam flow velocity on the water surface of the accumulator 33 is small, the low-pressure steam pipe 36 is supplied with high-quality steam having a high dryness with little entrainment of water droplets. In order to prevent water droplets from accompanying the low-pressure steam pipe 36, it is preferable that the accumulator 33 is replenished with water from the bottom of the accumulator 33 so that the water surface is not rippled as much as possible. Further, the steam supplied from the steam pipe 32 to the water in the accumulator 33 is configured to be fine bubbles as described above, thereby suppressing the water surface from being rippled.

  If the pressure P2 falls below the set value of the pressure P3 while the steam is supplied from the accumulator 33 to the thermal equipment 3, the pressure reducing valve 52 is closed and the steam supply from the steam supply device 10 is stopped. When the pressure of the existing low-pressure side pipe 14 decreases to the set value of the pressure P4 as the steam is consumed in the heat equipment 3, steam starts to be supplied from the existing high-pressure side pipe 13 to the heat equipment 3 through the pressure reducing valve 15. . This state continues until the amount of solar radiation increases again and the pressure P2 exceeds the set value of the pressure P3. Thus, when the amount of solar radiation is insufficient, low-pressure steam having a constant pressure (set value of pressure P4) is supplied from the existing high-pressure side pipe 13 to the thermal equipment 3.

  In other words, the low pressure steam having a pressure with the set value of the pressure P3 as the upper limit and the set value of the pressure P4 as the set value is constantly and stably supplied to the thermal equipment 3. Further, since the set value of the pressure P3 is slightly higher than the set value of the pressure P4, the steam supply device 10 preferentially supplies the low pressure steam to the thermal equipment 3 over the existing high pressure side pipe 13. Therefore, the fuel consumption and CO2 emission of the existing steam supply device 4 can be reduced.

  Incidentally, a safety valve 57 is attached to the leak pipe 56. The solar heat collected on the heat collecting pipe 31 of the heat collector 30 is too strong, and the system of the existing steam supply device 4 (low pressure steam pipe 36, accumulator 33, return water pipe 35, heat collecting pipe 31, steam pipe 32) When the pressure exceeds the allowable range, the safety valve 57 attached to the leak pipe 56 is opened, and steam is leaked to the outside through the leak pipe 56. Thereby, for example, steam leakage from piping around the heat collector 30 is prevented.

  In summary, the fuel consumption of the boiler 2 of the existing steam supply device 4 can be suppressed by solar heat. Secondly, the unstable solar heat can be effectively used to stably produce low-pressure steam that is highly needed in factories and the like. Thirdly, it is possible to supply high-quality steam with a constant pressure and high dryness without worrying about air mixing into the system of the existing steam supply device 4. Fourth, since water is used as a heat storage medium, it is inexpensive and safe and can be easily discarded. In addition, the steam supply system 5 can be integrated with a heat collecting part and a heat storage part, or can be integrated with a vacuum pump, a pressure reducing valve, a safety valve, a water supply pump, and the like. Is easy.

  As mentioned above, although an example of the preferred embodiment of this invention was demonstrated, this invention is not limited to the form shown here. When the steam supply device 10 is newly incorporated in the existing steam supply device 4 installed in the building 1 in advance, there may be a case where there is no space for installing the pressure reducing valve 52 around the existing low-pressure side pipe 14. In that case, as shown in FIG. 2, the vacuum pumps, the pressure reducing valve and the safety valve are integrated (pump unit A) and installed near the heat collecting section. Further, when the steam supply device 10 is newly installed in the existing steam supply device 4 installed in the building 1 in advance, there may be a case where there is no installation space for the water supply pumps around the existing return water pipe 20. In that case, as shown in FIG. 3, the vacuum pumps, the pressure reducing valve, the safety valve, and the water supply pump are integrated (pump unit B) and installed near the heat collecting section. Moreover, although the example which introduce | transduces a steam supply apparatus into the building provided with the existing steam supply apparatus was shown, this invention is applicable also to a new building. The present invention can also be applied as an apparatus for supplying steam to a thermal apparatus when an existing steam supply apparatus such as a boiler is not provided.

  The present invention is useful for the demand for steam generated in a building.

DESCRIPTION OF SYMBOLS 1 Building 2 Boiler 3 Thermal equipment 4 Existing steam supply device 5 Steam supply system 9 High pressure steam system piping 10 Steam supply device 11 Main piping 12 High pressure steam header 13 Existing high pressure side piping 14 Existing low pressure side piping 15 Pressure reducing valves 16, 17 Pressure Sensor 20 Existing return water pipe 22 Water softener 29 Return water pipe 30 Heat collector 31 Heat collection pipe 32 Steam pipe 33 Accumulator 34 Ball tap 35 Return water pipe 36 Low pressure steam pipe 37 Strainer 38 Water supply pump 39 Check valve 40 Pressure sensor 45 Supply water tank 46 Bypass piping 47 Ball tap 49 Temperature sensor 50 Strainer 51 Check valve 52 Pressure reducing valve 53 Pressure sensor 55 Pressure reducing piping 56 Leak piping 57 Safety valve 60 Pressure sensor 61 Vacuum pump 62 Check valve 63 Electromagnetic valve 65 Control unit

Claims (4)

An apparatus for supplying steam to a thermal device,
An accumulator for storing steam boiled by solar heat,
A steam pipe for supplying steam stored in the accumulator to the thermal device;
A vacuum pump for reducing the pressure inside the steam pipe to create a boiling state;
The steam supply device using solar heat, wherein the vacuum pump depressurizes the inside of the steam pipe only when the boiling point of the steam is lower than the boiling point at atmospheric pressure. It has a collector that makes steam by boiling water with solar heat,
Steam produced by the collector is supplied to the accumulator;
The steam supply device using solar heat according to claim 1, wherein water is stored in the accumulator, and steam generated by the heat collector is supplied into the water of the accumulator. It has an existing steam supply device that supplies steam made by a boiler to the thermal equipment,
A steam supply system, wherein steam produced by the steam supply device according to claim 1 or 2 is preferentially supplied to the thermal equipment. The steam supply system according to claim 3, wherein a part of the return water returned from the thermal device to the boiler is returned to the accumulator of the steam supply device.

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