JP5268467B2 - Steam generation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam generating system for achieving high thermal efficiency. <P>SOLUTION: The steam generating system includes a cushion tank 11 to which water is supplied from a water supply source 21 and which stores hot water (or water, hereinafter the same); a water supply tank 23 for storing hot water supplied from the tank 11; a steam boiler 24 for heating the hot water supplied from the tank 23 to generate steam; and a heat pump water heater 12 for heating the hot water supplied from the tank 11 and supplying the hot water again to the tank 11. In the tank 23, when water storage amount becomes below first water storage amount, water supply from the tank 11 is started, and when the water storage amount exceeds second water storage amount larger than the first water storage amount, water supply from the tank 11 is stopped. The heat pump water heater 12 starts circulation heating operation for heating hot water within the tank 11 and supplying the hot water again to inside of the tank 11 when water storage temperature within the tank 11 becomes below first temperature, and stops the circulation heating operation when the water storage temperature within the tank exceeds second temperature higher than the first temperature. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a steam generation system that generates steam by heating supplied water or hot water.

  FIG. 6 shows a schematic configuration of a conventional steam generation system (see, for example, Patent Document 1). A conventional steam generation system 100 shown in FIG. 6 includes a water supply source 21, a water supply tank 23, and a steam boiler 24, and includes a softener 22 for appropriately softening water.

  The water (low temperature water) supplied from the water supply source 21 is softened to remove hardness components such as calcium and magnesium by the softener 22 in advance, and then supplied into the water supply tank 23 via the motor-operated valve 31. The This water is stored in the water supply tank 23 and sent out from the water outlet 33 to the steam boiler 24. Then, the water is heated by the steam boiler 24 and steam is generated from the steam generating port 34.

  The steam boiler 24 takes in water from the water supply tank 23 according to the steam demand and performs heat treatment. Here, in the water supply tank 23, a water level sensor 32 capable of determining the water storage level in the tank is provided.

  The water level sensor 32 is realized by, for example, two electrode rods 32L and 32H having different lengths fixedly installed vertically downward from the inner wall of the upper surface of the tank. The water storage level can be determined depending on whether or not the position moved upward by a predetermined height from the tip is touching the water surface. For example, if the height position from the bottom of the tank at the tip of the short electrode rod 32L is the first water level and the height position from the tank bottom at the tip of the long electrode rod 32H is the second water level, 23 is lower than the first water level when the tip of the electrode rod 32L does not touch the water surface, and when the tip of the electrode rod 32L touches the water surface and the tip of the electrode rod 32H does not touch the water surface. Is equal to or higher than the first water level and lower than the second water level, and can be determined to be equal to or higher than the second water level when the tips of the electrode rods 32L and 32H touch the water surface.

  The motor-operated valve 31 is configured to be controllable by a water level sensor 32. Control is performed so that the motor-operated valve 31 opens when it falls below the first water level, and the motor-operated valve 31 closes when it exceeds the second water level. That is, when the water level sensor is composed of an electrode rod, when it is recognized that the tip of the electrode rod 32L is separated from the water surface, the motor-operated valve 31 is opened and the tip of the electrode rod 32H touches the water surface. When this is recognized, the motor-operated valve 31 is closed.

  In such a configuration, when steam demand occurs, water is supplied from the water supply tank 23 to the steam boiler 24, the amount of water stored in the water supply tank 23 decreases, and the water storage level decreases. When the water storage level falls below the first water level, the motor-operated valve 31 is automatically opened, and water is supplied from the water supply source 21. Thereafter, when the demand for steam decreases, the water storage amount and the water storage level in the water supply tank 23 increase, and when the water storage level exceeds the second water level, the motor-operated valve 31 is automatically closed.

JP-A-6-249450

  However, in the case of the configuration of FIG. 6, the water stored in the water supply tank 23 is the water supplied from the water supply source, and thus the water temperature is approximately in the range of about 5 ° C. to 30 ° C. although it varies depending on the temperature. . Therefore, in the steam boiler 24, the low-temperature water of about 5 ° C. to 30 ° C. is heated to 100 ° C., further heated to saturated steam, and further heated to a predetermined steam pressure to supply steam. In general, the steam boiler 24 is composed of a combustion boiler, and the efficiency of the steam generation system 100 having the conventional configuration has a limit value of 90% to 90% at the maximum. From the viewpoint of the recent global warming problem and the promotion of energy saving, development of a steam generation system with higher energy efficiency is required.

  An object of this invention is to provide the steam generation system which can implement | achieve energy efficiency higher than a conventional structure in view of said problem.

In order to achieve the above object, a steam generation system according to the present invention is configured to be supplied from a water supply source, and stores a water or hot water stored in a cushion tank and water or hot water supplied from the cushion tank. Water or hot water supplied from the cushion tank by exchanging heat with heat from a water supply tank, a steam boiler that generates water by heating water or hot water supplied from the water supply tank, and a condenser of a heat pump circuit A heat pump water heater that heats and supplies water to the cushion tank again,
The water supply tank is configured such that water supply from the cushion tank starts when the water storage amount falls below the first water storage amount, and water supply from the cushion tank stops when the water supply amount exceeds a second water storage amount greater than the first water storage amount. I der, further wherein with water from the water supply source to the first water storage amount less below a predetermined third water volume is started, the third water volume number the predetermined smaller than the first water storage amount than When it exceeds the 4th water storage volume, it is the composition that water supply from the water supply source stops,
The heat pump water heater starts a circulating heating operation in which the water or hot water in the cushion tank is heated and supplied into the cushion tank again when the water storage temperature in the cushion tank falls below the first temperature, and the cushion The first feature is that the circulating heating operation is stopped when the water storage temperature in the tank exceeds a second temperature higher than the first temperature.

  According to the first feature of the steam generation system of the present invention, since the hot water in the cushion tank is supplied into the water supply tank, the water stored in the water supply tank is directly supplied from the water supply source. The temperature is higher than that of the conventional configuration stored in the water tank. And the warm water stored in this cushion tank is warm water heated by the highly efficient heat pump water heater. That is, in a steam boiler, since steam can be generated from warm water preheated by a heat pump water heater, the amount of energy required in the steam boiler can be reduced. Generally, since a steam boiler is a combustion type, its thermal efficiency is lower than that of a heat pump water heater. For this reason, it is set as the structure which raises the water temperature of the water supplied from a water supply source beforehand to predetermined temperature (for example, about 65 degreeC) with a heat pump water heater, and heats it with a steam boiler after that, and generates a vapor | steam. Thus, energy efficiency can be improved as compared with a configuration in which water supplied from a water supply source is directly heated by a steam boiler to generate steam.

  Moreover, since it is the structure by which the hot water supply from a heat pump water heater and the water supply from a water supply source are performed with respect to a cushion tank, it can respond also to big steam load, ensuring high energy efficiency.

  In addition to the first feature, the steam generation system according to the present invention is installed in the water storage tank and a circulation pump for circulating hot water between the cushion tank and the heat pump water heater. A temperature sensor, and when it is determined by the temperature sensor that the water storage temperature in the cushion tank is lower than the first temperature, an operation instruction is given to the circulation pump and the heat pump water heater, When the temperature sensor determines that the water storage temperature in the cushion tank has exceeded the second temperature, a stop instruction is given to the circulation pump and the heat pump water heater. .

In addition to the first or second feature, the steam generation system according to the present invention includes a first electric valve for guiding the hot water in the cushion tank into the water supply tank, and a water storage in the water supply tank. A water level sensor capable of recognizing the position, and when the water level sensor determines that the water storage level in the water supply tank has fallen below the first water level, control is performed to open the first motor-operated valve. When it is determined by the water level sensor that the water storage level in the water supply tank has exceeded a second water level higher than the first water level, a control for closing the first motor-operated valve is performed. Features.

The steam generation system according to the present invention is configured to be supplied with water from a water supply source through a water supply channel, and heats the water or hot water supplied from the water supply tank and water or hot water stored in the water supply tank. A steam boiler that generates steam and heat pump water heater that exchanges heat with heat radiation from the condenser of the heat pump circuit, heats the water that is branched from the water supply path, and supplies water to the water supply tank The water supply tank starts to supply hot water heated by the heat pump water heater when the stored water amount falls below a predetermined first stored water amount and has a predetermined first amount greater than the first stored water amount. a configuration in which more than two water storage and feed water heated hot water by the heat pump water heater is stopped, further, from the water supply source and lower than the third water volume of predetermined smaller than the first water volume With water is started, the fourth feature that the water supply is stopped from the water supply source to be above the third water volume more the predetermined fourth storage volume smaller than the first storage volume.

  According to the fourth feature of the steam generation system according to the present invention, when the steam load increases and the amount of water stored in the water supply tank decreases, the high efficiency heat pump water heater first preferentially removes from the water supply source. In this configuration, the water supply is supplied into the water supply tank after being heated. For this reason, the hot water stored in the water supply tank has a higher temperature than the conventional configuration in which water is directly stored in the water supply tank from the water supply source. And in a steam boiler, since steam can be produced | generated from this warm water heated previously with the heat pump water heater, the amount of energy required by a steam boiler can be reduced. Generally, since a steam boiler is a combustion type, its thermal efficiency is lower than that of a heat pump water heater. For this reason, it is set as the structure which raises the water temperature of the water supplied from a water supply source beforehand to predetermined temperature (for example, about 65 degreeC) with a heat pump water heater, and heats it with a steam boiler after that, and generates a vapor | steam. Thus, energy efficiency can be improved as compared with a configuration in which water supplied from a water supply source is directly heated by a steam boiler to generate steam.

  Further, when the steam load is larger than the hot water supply capacity of the heat pump water heater, water is supplied into the water tank from the water supply source in addition to the hot water supplied from the heat pump water heater. At this time, it is possible to cope with a large steam load while ensuring high energy efficiency by continuously operating a highly efficient heat pump water heater.

  In addition to the fourth feature, the steam generation system according to the present invention includes a first electric valve for guiding hot water heated by the heat pump water heater into the water supply tank, and water storage in the water supply tank. A water level sensor capable of recognizing the position, and when the water level sensor determines that the water storage level in the water supply tank has fallen below the first water level, control is performed to open the first motor-operated valve. When the water level sensor determines that the water level in the water supply tank has exceeded the second water level higher than the first water level, the control to close the first motor-operated valve is performed. Features.

In addition to the third or fifth feature, the steam generation system according to the present invention includes a second electric valve for guiding the water supply from the water supply source into the water supply tank, and the water level sensor detects the water supply sensor. When it is determined that the water storage level in the water supply tank has fallen below a third water level lower than the first water level, control for opening the second motor-operated valve is performed, and the water level sensor is used to control the opening in the water supply tank. When it is determined that the water storage level is higher than the fourth water level higher than the third water level and lower than the first water level, control for closing the second electric valve is performed. .

Further, in addition to the third or fifth feature, the steam generation system according to the present invention is configured so that the water supply tank has a water storage level in the water supply tank lower than a third water level lower than the first water level. Water supply is started from a water supply source, and a seventh feature is provided with a ball tap that stops water supply from the water supply source when it exceeds a fourth water level that is higher than the third water level and lower than the first water level.

  According to the steam generation system of the present invention, energy efficiency higher than that of the conventional steam generation system can be realized.

  Hereinafter, an embodiment of a steam generation system according to the present invention (hereinafter referred to as “the present system” as appropriate) will be described with reference to the drawings. In addition, about the component same as the component in FIG. 6, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

[First Embodiment]
A first embodiment of the system (hereinafter referred to as “this embodiment” as appropriate) will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of the system in the present embodiment. The system 1 shown in FIG. 1 includes a water supply source 21, a softener 22, a water supply tank 23, a steam boiler 24 as well as the steam generation system 100 of the conventional configuration shown in FIG. It is the structure provided with the cushion tank 11 and the heat pump water heater 12 which the generating system 100 does not have. In the drawing, in order to distinguish the flow of water or hot water from the flow of control signals, the flow of water or hot water is indicated by a solid line, and the flow of control signals is indicated by a dotted line.

  In addition, unlike the conventional configuration, in this embodiment, the valve 47 is normally closed so that the water supply from the water supply source 21 is not supplied to the water supply tank 23. That is, all the water supplied from the water supply source 21 is normally supplied into the cushion tank 11 from the water inlet 41. The water inlet 41 is provided in the lower region of the cushion tank 11.

  The cushion tank 11 is provided with a temperature sensor 44 capable of measuring the temperature of the hot water stored. In FIG. 1, as an example, a configuration including two sensors, a temperature sensor 44a for measuring the water temperature at the low water level position in the cushion tank 11 and a temperature sensor 44b for measuring the water temperature at a higher water level position is illustrated. The number of temperature sensors is an example, and is not limited to the configuration shown in FIG.

When the circulation pump 43 is operated, the hot water stored in the cushion tank 11 is guided to the heat pump water heater 12 through the water outlet 42 provided in the lower region of the cushion tank 11 as well as the water inlet 41. Then, after heat is exchanged in the heat pump water heater 12 by heat exchange with heat radiation from the condenser of the heat pump circuit, the water is stored in the cushion tank 11 again. At this time, the hot water heated by the heat pump water heater 12 is supplied into the cushion tank 11 via the water inlet 45 provided above the water inlet 41 and the water outlet 42 in the cushion tank 11. Since the water has a property of moving upward as the temperature increases, so-called convection, hot water having a high temperature is stored in the upper region of the cushion tank 11.

  The hot water stored in the water storage tank 11 is taken out from the water outlet 46 provided in the upper region of the tank 11 and guided to the water supply tank 23 from the water inlet 54 via the electric valve 31. The motor-operated valve 31 is configured to be capable of opening / closing control, and is configured to be able to control whether or not the hot water in the cushion tank 11 is supplied into the water supply tank 23 by performing such control.

  Similar to the conventional steam generation system 100 shown in FIG. 6, the water supply tank 23 includes a water level sensor 32 that can determine the water storage level in the tank. The motor-operated valve 31 is controlled in accordance with the water storage level in the tank determined by the water level sensor 32. When the motor level falls below the first water level, the motor-operated valve 31 is opened and the motor level is higher than the first water level. When the water level exceeds two, the motor-operated valve 31 is controlled to close. Similar to the steam generation system 100, when the water level sensor 32 is realized by vertically installing two electrode rods 32L and 32H having different lengths from the inner wall of the tank upper surface, for example, the longer one When it is recognized that the tip of the electrode rod 32L is separated from the water surface, the motor-operated valve 31 is opened, and when it is recognized that the tip of the shorter electrode rod 32H touches the water surface, the motor-operated valve 31 is closed. Control is performed.

  Further, the water supply tank 23 is provided with a water outlet 33 in a lower region of the tank, and the hot water in the tank taken out from the water outlet 33 is led to the steam boiler 24 and heated by the boiler 24. Steam is generated. The steam boiler 24 generates steam from the steam generation port 34.

  Here, in the present system 1, operation control of the heat pump water heater 12 and the circulation pump 43 is performed by the temperature sensor 44 provided in the cushion tank 11. More specifically, the heat pump water heater 12 and the circulation pump 43 start operation when the temperature sensor 44b installed in the upper part of the cushion tank 11 falls below a predetermined temperature (for example, 50 ° C.), and supplies hot water from the tank 11. A circulation heating operation is started, which is led to the heat pump water heater 12 and heated to a predetermined temperature (for example, about 65 ° C.) and returned to the cushion tank 11 again. As a result, the water temperature in the cushion tank 11 rises. Then, when the temperature sensor 44a installed in the lower part in the cushion tank 11 exceeds a predetermined temperature (for example, 50 ° C.), the operation of the heat pump water heater 12 and the circulation pump 43 is stopped, and the circulation heating operation is stopped. By performing such control, when the water temperature in the cushion tank 11 is lowered, circulation heating is automatically performed by the heat pump water heater 12.

  When only one temperature sensor 44 is provided in the cushion tank 11, when the temperature sensor 44 recognizes that the hot water temperature in the cushion tank 11 has fallen below a predetermined first temperature (for example, 45 ° C.), The heat pump water heater 12 and the circulation pump 43 are started to start the circulation heating operation. When the hot water temperature in the cushion tank 11 rises and the temperature sensor 44 recognizes that the hot water temperature in the cushion tank 11 has exceeded a second temperature (for example, 60 ° C.) higher than the first temperature, the heat pump hot water supply The operation of the machine 12 and the circulation pump 43 is stopped, and the circulation heating operation is stopped. By controlling in this way, it is possible to perform the same control as when a plurality of temperature sensors are provided at different height positions in the cushion tank 11.

  When configured in this manner, since the hot water in the cushion tank 11 is supplied into the water supply tank 23, the water stored in the water supply tank 23 is hotter than the conventional configuration shown in FIG. . The hot water stored in the cushion tank 11 is hot water heated to about 65 ° C. by the high-efficiency heat pump water heater 12. That is, in the case of the conventional configuration of FIG. 6, since the water supplied from the water supply source 21 (about 5 ° C. to 30 ° C. depending on the temperature) is stored in the water supply tank 23, the steam boiler 24 supplies such low temperature water. It is necessary to heat up to 100 ° C. and further perform compression heating to generate steam. In the case of this system 1, since it is a structure heated to about 65 degreeC by the highly efficient heat pump water heater 12, in the steam boiler 24, a vapor | steam is produced | generated from the hot water in the water supply tank 23 which shows about 65 degreeC. This can reduce the amount of energy required in the steam boiler 24. Generally, since the steam boiler 24 is a combustion type, its thermal efficiency is lower than that of the heat pump water heater 12. For this reason, the temperature of the water supplied from the water supply source 21 is raised to a predetermined temperature (about 65 ° C.) in advance by the heat pump water heater 12 and then heated by the steam boiler 24 to generate steam. By doing, energy efficiency can be improved compared with the structure which heats the water supplied from the water supply source 21 directly with the steam boiler 24, and generate | occur | produces a vapor | steam.

  Further, according to the present system 1, the cushion tank 11 is shielded from direct supply of water from the water supply source 21 to the water supply tank 23 via the valve 47 with respect to the system 100 having the conventional configuration shown in FIG. This can be realized by newly providing the heat pump water heater 12 and the circulation pump 43. That is, it is possible to change to a steam generation system having higher energy efficiency than the conventional one while using an existing system.

  Furthermore, even if the steam load increases and the load exceeds the hot water supply capacity of the heat pump water heater 12, the operation of the heat pump water heater 12 is continued and the shortage is supplied from the water supply source 21 to the cushion tank 11. Since the water is supplied to the inside, the energy efficiency is not significantly reduced, and a shortage of water supply is not caused.

  In the above-described embodiment, the water supply tank 23 includes the water level sensor 32 that can determine the storage level of the hot water stored in the tank. However, the hot water stored in the water supply tank 23 is stored in the storage tank 23. It is good also as a structure provided with the water quantity sensor which can determine the quantity. In this case, when it is determined by the water amount sensor that the amount of water stored in the water supply tank 23 has fallen below the predetermined first water storage amount, control to open the motor-operated valve 31 is performed, and a predetermined first amount greater than the first water storage amount is performed. It can be set as the structure by which control which closes the motor operated valve 31 is performed when it determines with having exceeded 2 water storage amount.

  Moreover, in this system 1, although it was set as the structure provided with the softener 22 which performs a softening process with respect to the water supply from the water supply source 21, in the system to which the water which does not need to perform a softening process is supplied, it is necessary to provide the softener 22 It goes without saying that there is nothing. The same applies to the following second embodiment.

  As described above, the valve 47 in the present system 1 is kept closed during normal operation. However, when an unexpected situation such as a hole in the cushion tank 11 occurs, the valve is opened. As mentioned above, it is possible to cope with the steam load by supplying water directly into the water supply tank 23 from the water supply source 21.

[Second Embodiment]
A second embodiment of the present system (hereinafter referred to as “this embodiment” as appropriate) will be described with reference to the drawings.

  FIG. 2 is a block diagram showing a schematic configuration of the system in the present embodiment. Compared with the system 1a according to the first embodiment shown in FIG. 1, the system 1a shown in FIG. 2 does not include the cushion tank 11, and the hot water heated by the heat pump water heater 12 is directly supplied to the water supply tank 23. Different points are supplied.

  That is, the water supplied from the water supply source 21 and softened by the softener 32 is led to the heat pump water heater 12 from the branch point 40 and heated by the heat pump water heater 12, and then the electric valve 51 (first valve) 1 corresponding to one motor-operated valve) from the water inlet 55 to the water supply tank 23. The motor-operated valve 51 is configured to be capable of open / close control, and can adjust whether or not to supply the hot water output from the heat pump water heater 12 into the water supply tank 23.

  In this embodiment, unlike the first embodiment, the water supply from the water supply source 21 enters the water supply tank 23 directly from the water inlet 54 through the electric valve 31 (corresponding to the second electric valve) from the branch point 40. It is the structure supplied.

  Furthermore, in this embodiment, in addition to the water level sensor 32, another water level sensor 52 is provided in the water supply tank 23. In FIG. 2, the water level sensor 52 is also realized by fixing and installing two electrode rods 52L and 52H having different lengths vertically downward from the inner wall of the upper surface of the tank, similarly to the water level sensor 32. , 52H, or a position that moves upward by a predetermined height from the lower front end portion is configured so that the water storage level can be determined depending on whether or not it touches the water surface.

  In this case, the electrode rods 52L and 52H are configured to be able to measure the water level that is higher in height from the tank bottom than the electrode rods 32L and 32H provided in the water level sensor 32. In this embodiment, for convenience of explanation, the height position from the bottom of the tank at the tip of the short electrode rod 52L is the first water level, and the height from the bottom of the tank at the tip of the long electrode rod 52H. The position is the second water level, and the height positions of the tips of the electrode rods 32L and 32H are the third water level and the fourth water level (corresponding to the first and second water levels in the first embodiment, respectively). At this time, the tip positions of the electrode rods are adjusted so that the first water level and the second water level are higher than the height positions of both the third water level and the fourth water level.

  At this time, the water storage level in the tank 23 is less than the first water level when the tip of the electrode rod 52L does not touch the water surface, the tip of the electrode rod 52L touches the water surface, and the tip of the electrode rod 52H touches the water surface. If it is not, it can be determined that the water level is equal to or higher than the first water level and lower than the second water level, and is higher than the second water level when the tips of both electrode rods 52L and 52H touch the water surface. Further, when the tip of the electrode rod 32L does not touch the water surface, it is less than the third water level, and when the tip of the electrode rod 32L touches the water surface and the tip of the electrode rod 32H does not touch the water surface, the third water level or higher. When the water level is lower than the fourth water level and the tips of both electrode rods 32L and 32H are touching the water surface, it can be determined that the water level is higher than the fourth water level.

  The motor-operated valve 51 is configured to be controllable by the water level sensor 52. The motor-operated valve 51 is opened when the water level is lower than the first water level, and the motor-operated valve 51 is closed when the water level is higher than the second water level. . That is, when the water level sensor 52 is constituted by an electrode rod as shown in FIG. 2, when it is recognized that the tip of the electrode rod 52L is separated from the water surface, the motor-operated valve 51 is opened, and the electrode When it is recognized that the tip of the rod 52H has touched the water surface, the motor-operated valve 51 is closed. As with the first embodiment, the motor-operated valve 31 is configured to be controllable by a water level sensor 32. When the motor-operated valve 31 falls below a third water level (corresponding to the first water level in the first embodiment), the motor-operated valve 31 is opened. And if it exceeds the 4th water level (equivalent to the 2nd water level in 1st Embodiment), control which the motor operated valve 31 will close is performed.

  Furthermore, in this embodiment, the heat pump water heater 12 and the circulation pump 43 are also configured such that operation control is performed by the water level sensor 52. That is, when the water storage level in the water supply tank 23 is lower than the first water level, the motor-operated valve 51 is opened and the heat pump water heater 12 and the circulation pump 43 are started to operate. Control to stop the operation of the heat pump water heater 12 and the circulation pump 43 while closing the valve 51 is performed.

  When comprised in this way, if the steam load of the steam boiler 24 will rise, the water storage level in the water supply tank 23 will fall. When the water level sensor 52 recognizes that the water level in the water supply tank 23 has fallen below the first water level, the motor-operated valve 51 is opened and the heat pump water heater 12 and the circulation pump 43 are started. . At this time, the water supplied from the water supply source 21 via the branch point 40 is heated by the heat pump water heater 12, and the heated hot water is supplied into the water supply tank 23 from the water inlet 55 via the electric valve 51. The As a result, the rate of decrease of the water level in the water supply tank 23 is suppressed, or the water level starts to rise.

  Note that the hot water supplied into the water supply tank 23 at this time is not the water supplied from the water supply source 21 but the hot water previously heated by the heat pump water heater 12 (for example, about 65 ° C.). The hot water temperature in the water supply tank 23 is sufficiently higher than the water supplied from the water supply source 21.

  When the stored water level rises due to the supply of hot water from the heat pump water heater 12, when the water level sensor 52 recognizes that the stored water has exceeded the second water level, the motor-operated valve 51 is closed and the heat pump water heater 12 and the circulation pump 43 are stopped. On the other hand, when the steam load is larger than the hot water supply capacity from the heat pump water heater 12, the water storage level in the water supply tank 23 further decreases. When the water level sensor 32 recognizes that the water storage level has fallen below the third water level, the motor-operated valve 31 is opened, and the water supplied from the water supply source 21 flows directly into the water supply tank 23. This makes it possible to cope with a large steam load.

  In this case, since the water from the water supply source 21 is directly supplied into the water supply tank 23, the water temperature in the tank 23 decreases to some extent, but the hot water supply from the heat pump water heater 12 is still continued. The decrease in water temperature is suppressed.

  Thereafter, when the steam load decreases or the amount of water supplied from the water supply source 21 is larger than the amount of water used in the steam load, the water storage level in the water supply tank 23 increases. When the water level sensor 32 recognizes that the water storage level has exceeded the fourth water level, the motor-operated valve 31 is closed and the water supply from the water supply source 21 is stopped. At this time, hot water supply from the heat pump water heater 12 is continued, and thereby the water temperature and the water level in the water supply tank 23 rise. And if the water level of the water supply tank 23 exceeds a 2nd water level after that, the hot water supply from the heat pump water heater 12 will stop as mentioned above.

  In the case of the present system 1a according to the present embodiment, as in the case of the first embodiment, the hot water heated in advance by the heat pump water heater 12 is stored in the water supply tank 23. Compared with the system 100 of the conventional configuration, the energy efficiency can be improved.

  And even if it is a case where a steam load rises and it becomes a load of the grade which exceeds the hot-water discharge capacity of the heat pump water heater 12, the operation of the heat pump water heater 12 is continued and the water supply source 21 directly enters the water tank 23. Since it is the structure supplied with water, energy efficiency is not reduced significantly and a shortage of water supply is not caused.

  FIG. 3 is a view for explaining the water supply state of the water supply tank 23 provided in the present system 1a. As described above, when the water storage level in the water supply tank 23 is lower than the first water level (that is, when the tip of the electrode rod 52L is separated from the water surface), hot water is supplied from the heat pump water heater 12 to the water supply tank 23. When the water level falls below the third water level (that is, when the tip of the electrode rod 32L is separated from the water surface), water supply from the water supply source 21 is started in addition to the hot water supply from the heat pump water heater 12. Thereafter, when the water storage level exceeds the fourth water level (that is, when the tip of the electrode rod 32H touches the water surface), only the water supply from the water supply source 21 is stopped, and only the hot water supply from the heat pump water heater 12 is performed. Further, when the water storage level rises and exceeds the second water level (that is, when the tip of the electrode rod 52H touches the water surface), the hot water supply from the heat pump water heater 12 is also stopped.

  That is, also in the present embodiment, the heat pump water heater 12 with high energy efficiency is always preferentially operated to supply hot water, and water supply from the water supply source 21 is applied to a steam load exceeding the hot water supply capacity of the heat pump water heater 12. It is the structure which performs this additionally. This makes it possible to avoid a shortage of water supply while improving energy efficiency.

  In the present embodiment described above, the water supply tank 23 includes the water level sensor 32 that can determine the storage level of the hot water stored in the tank. However, as in the first embodiment, It is good also as a structure provided with the water amount sensor which can determine the amount of warm water stored in. In this case, when it is determined by the water amount sensor that the amount of water stored in the water supply tank 23 has fallen below the predetermined first water storage amount, the motor-operated valve 51 is opened and the heat pump water heater 12 and the circulation pump 43 are started to operate. When it is determined that a predetermined second water storage amount greater than the first water storage amount has been exceeded, the motor-operated valve 51 is closed and the operation of stopping the operation of the heat pump water heater 12 and the circulation pump 43 is controlled. Can be done. Further, when it is determined that the amount of water stored in the water supply tank 23 has fallen below a predetermined third amount of water stored that is smaller than the first amount of water stored, control to open the motor-operated valve 31 is performed. If it is determined that the predetermined fourth water storage amount that is larger than the first water storage amount and smaller than the first water storage amount is determined, control for closing the motor-operated valve 31 is performed.

  In the present embodiment, there is circulating heating in which the hot water stored in the water supply tank 23 is guided to the heat pump water heater 12 via the circulation pump, and the hot water heated by the heat pump water heater 12 is supplied again into the water supply tank 23. A possible configuration is also possible. By adopting such a configuration, even when there is no steam load, even when the amount of water stored in the water supply tank 23 is sufficiently large, the water temperature in the water supply tank 23 is raised to a high temperature in advance by forcibly circulating heating. It is possible to supply hot water to the steam boiler 24 when a steam load is generated. This can further improve energy efficiency.

  In this case, a temperature sensor may be provided in the water supply tank 23 so that the circulation heating is performed only when the steam load is not generated and the water temperature in the tank 23 falls below a predetermined temperature. good. The same applies to a third embodiment to be described later.

[Third Embodiment]
A third embodiment of the present system (hereinafter referred to as “this embodiment” as appropriate) will be described with reference to the drawings. The present embodiment is different from the second embodiment only in that a ball tap 53 is provided instead of the water level sensor 32 and the motor-operated valve 31, and the rest is the same as the system 1a according to the second embodiment. Therefore, in the following, only different points from the second embodiment will be described.

  FIG. 4 is a block diagram showing a schematic configuration of the system according to the present embodiment. As described above, the present system 1b shown in FIG. 4 is configured not to include the water level sensor 32 and the electric valve 31, but to include the ball tap 53, as compared with the present system 1a of the second embodiment illustrated in FIG. . The water supply from the water supply source 21 is supplied into the water supply tank 23 via the water inlet 54 and the ball tap 53.

  The ball tap 53 is a water supply member having a mechanism that opens when the water storage level falls below a predetermined lower limit water level and closes when the water storage level reaches a higher upper limit water level. Therefore, the effect similar to this system 1b of 2nd Embodiment is realizable by setting the ball tap 53 so that operation | movement similar to the motor operated valve 31 in 2nd Embodiment may be performed. Specifically, when the water storage level in the water supply tank 23 is lower than the third water level, water supply starts from the water supply source 21 via the water inlet 54 and the ball tap 53, and when it exceeds the fourth water level, the water supply is stopped. The ball tap 53 may be adjusted. The rest of the configuration is the same as that of the system 1b in the second embodiment, and a description thereof is omitted.

[Fourth Embodiment]
A fourth embodiment of the present system (hereinafter referred to as “this embodiment” as appropriate) will be described with reference to the drawings. In the following drawings, the same reference numerals are given to the same components as the system in each of the above embodiments, and the description thereof is omitted.

  FIG. 5 is a block diagram showing a schematic configuration of the system in the present embodiment. The system 1c shown in FIG. 5 is configured such that the system 1a (FIG. 1) of the first embodiment and the system 1b (FIG. 2) of the second embodiment are combined.

  That is, the point that water from the water supply source 21 is supplied to the water supply tank 23 via the motor-operated valve 31 and the point that the motor-operated valve 31 is controlled to be opened and closed by the water level sensor 32 are the same as those of the system 1b of the second embodiment. It is common. On the other hand, it is common with the system 1a of 1st Embodiment about the point provided with the cushion tank 11 and being comprised so that circulation heating is possible between the cushion tank 11 and the heat pump water heater 12. FIG.

  As shown in FIG. 5, in the present system 1 c, the water supplied from the water supply source 21 is first guided to the cushion tank 11 via the branch point 40. And the temperature sensor 44 is provided in the cushion tank 11 similarly to this system 1 in 1st Embodiment, According to the water temperature in the cushion tank 11 measured by this temperature sensor, the heat pump water heater 12 and the circulation Operation control of the pump 43 is performed.

  Further, the hot water stored in the cushion tank 11 is supplied from the water outlet 46 into the water supply tank 23 through the electric valve 51 through the electric valve 51. The water supply tank 23 is provided with a water level sensor 52, and the open / close control of the electric valve 51 is performed by the water level sensor 52. Since the relationship between the water level sensor 32 and the water level sensor 52 is common to the system 1a of the second embodiment, the description thereof is omitted.

  When comprised in this way, if a steam load generate | occur | produces, warm water will be sent to the steam boiler 24 from the feed water tank 23, and the water storage level in the feed water tank 23 will fall. When the water level sensor 52 recognizes that the stored water level in the water supply tank 23 has fallen below the first water level, the motor-operated valve 51 is opened, and hot water in the cushion tank 11 is supplied into the water supply tank 23. . This prevents a sudden drop in the amount of water stored in the water supply tank 23. In addition, since the warm water heated by the heat pump water heater 12 is stored in the cushion tank 11, the sufficiently heated warm water is supplied into the feed water tank 23, and the water temperature in the feed water tank 23 is reduced. Decline can also be prevented.

  When hot water in the cushion tank 11 is supplied to the water supply tank 23, water is supplied from the water supply source 21 to the cushion tank 11. At this time, when the steam load is large, a large amount of hot water in the cushion tank 11 is supplied to the water supply tank 23, so that a large amount of water is supplied from the water supply source 21. Water temperature decreases. As in the case of FIG. 1, if the two temperature sensors 44a and 44b are installed at different positions in the cushion tank 11, the water temperature in the cushion tank 11 is measured by the temperature sensor 44b installed in the upper part. Is recognized to have fallen below a predetermined temperature (for example, 50 ° C.), the operation of the heat pump water heater 12 and the circulation pump 43 is started, whereby the hot water in the cushion tank 11 is circulated and heated to raise the water temperature.

  Thereafter, when the steam load is reduced and the water level sensor 52 recognizes that the water level in the water supply tank 23 has exceeded the second water level, the motor-operated valve 51 is closed. At this time, the hot water in the cushion tank 11 is circulated and heated by the heat pump water heater 12 until the temperature sensor 44a installed in the lower part recognizes that the water temperature has exceeded a predetermined temperature (for example, 50 ° C.). When the temperature sensor 44a recognizes that the water temperature has exceeded the predetermined temperature, the heat pump water heater 12 and the circulation pump 43 are stopped.

  On the other hand, when the steam load is still high and the steam load exceeds the hot water supply capacity of the heat pump water heater 12, the stored water level in the water supply tank 23 further decreases. When the water level sensor 32 recognizes that the water storage level in the water supply tank 23 has fallen below the third water level, the motor-operated valve 31 is opened and water supply from the water supply source 21 directly into the water supply tank 23 is started. Is done. As a result, there will be no shortage of water supply even for a large steam load.

  In the case of the present system 1c of the present embodiment as well, as in the above-described embodiments, since the hot water heated in advance by the high-efficiency heat pump water heater 12 is supplied to the water supply tank 23, the energy efficiency of the entire system is reduced. Can be improved. Furthermore, when a large steam load is generated, the operation of the heat pump water heater 12 is continued and water is supplied directly from the water supply source 21 into the water supply tank 23, so that energy efficiency is not significantly reduced. There will be no shortage of water supply.

  In the case of the present embodiment as well, as in the third embodiment, a configuration including a ball tap 53 in place of the water level sensor 32 and the motor-operated valve 31 may be employed.

  In each of the above embodiments, the circulation pump 43 for guiding the hot water to the heat pump water heater 12 is provided on the pipeline in the drawing, but the circulation pump 43 is built in the heat pump water heater 12. It doesn't matter.

The block diagram which shows schematic structure of 1st Embodiment of the steam generation system which concerns on this invention. The block diagram which shows schematic structure of 2nd Embodiment of the steam generation system which concerns on this invention. The figure for demonstrating the water supply state of the water supply tank with which the steam generation system of 2nd Embodiment is provided. The block diagram which shows schematic structure of 3rd Embodiment of the steam generation system which concerns on this invention. The block diagram which shows schematic structure of 4th Embodiment of the steam generation system which concerns on this invention. Block diagram showing schematic configuration of conventional steam generation system

Explanation of symbols

1, 1a, 1b, 1c: Steam generation system of the present invention 11: Cushion tank 12; Heat pump water heater 21: Water supply source 22: Softener 23: Water supply tank 24: Steam boiler 31: Electric valve 32: Water level sensor 32L, 32H : Water level electrode rod 33: Water outlet 34: Steam generating port 40: Branch point 41: Water inlet 42: Water outlet 43: Circulation pump 44: Temperature sensor 44a, 44b: Temperature sensor 45: Water inlet 47: Valve 51: Motorized valve 54: Water inlet 55: Water inlet 100: Conventional steam generation system

Claims (7)

Cushion tank that is configured to be supplied from a water supply source and stores water or hot water;
A water supply tank for storing water or hot water supplied from the cushion tank;
A steam boiler that generates steam by heating water or hot water supplied from the water supply tank;
Heat exchange with heat dissipation from the condenser of the heat pump circuit, heating water or hot water supplied from the cushion tank, and heat pump water heater for supplying water to the cushion tank again,
The water tank is
Water amount with water from the cushion tank and below the first water storage amount is started, I configuration der water supply is stopped from the cushion tank and above the second reservoir capacity larger than the first water storage amount, Further, when a predetermined third stored water amount lower than the first stored water amount is reached, water supply from the water supply source is started, and a predetermined fourth stored water amount that is larger than the third stored water amount and smaller than the first stored water amount. When it exceeds, water supply from the water supply source is stopped,
The heat pump water heater is
When the water storage temperature in the cushion tank is lower than the first temperature, a circulation heating operation for heating the water in the cushion tank or hot water and supplying the water into the cushion tank again is started, and the water storage temperature in the cushion tank is The steam generation system is characterized in that the circulation heating operation is stopped when a second temperature higher than the first temperature is exceeded. A circulation pump for circulating hot water between the cushion tank and the heat pump water heater;
A temperature sensor installed in the water storage tank,
When it is determined by the temperature sensor that the stored water temperature in the cushion tank has fallen below the first temperature, an operation instruction is given to the circulation pump and the heat pump water heater, and the cushion tank is instructed by the temperature sensor. The steam generation system according to claim 1, wherein when it is determined that the stored water temperature has exceeded the second temperature, a stop instruction is given to the circulation pump and the heat pump water heater. A first electric valve for guiding the hot water in the cushion tank into the water supply tank;
A water level sensor capable of recognizing a water storage level in the water supply tank,
When it is determined by the water level sensor that the water storage level in the water supply tank has fallen below the first water level, control is performed to open the first motor-operated valve, and the water level in the water supply tank is controlled by the water level sensor. 3. The steam generation system according to claim 1 , wherein when it is determined that has exceeded a second water level higher than the first water level, control for closing the first motor-operated valve is performed. A water supply tank configured to supply water from a water supply source through a water supply channel, and stores water or hot water;
A steam boiler that generates steam by heating water or hot water supplied from the water supply tank;
Heat exchange with heat radiation from the condenser of the heat pump circuit, heat the water branched and supplied from the water supply channel, and a heat pump water heater for supplying water to the water supply tank,
The water tank is
With water of water volume is heated by the heat pump water heater and below a predetermined first water storage hot water is started, heating by the heat pump water heater and above a predetermined second water storage amount larger than the first water volume The supply of the hot water is stopped, and when the water supply falls below a predetermined third water storage amount less than the first water storage amount, water supply from the water supply source starts and more than the third water storage amount. A steam generation system, wherein water supply from the water supply source is stopped when a predetermined fourth water storage amount that is less than the first water storage amount is exceeded. A first electric valve for guiding hot water heated by the heat pump water heater into the water supply tank;
A water level sensor capable of recognizing a water storage level in the water supply tank,
When it is determined by the water level sensor that the water storage level in the water supply tank has fallen below the first water level, control is performed to open the first motor-operated valve, and the water level in the water supply tank is controlled by the water level sensor. 5. The steam generation system according to claim 4, wherein when it is determined that has exceeded a second water level higher than the first water level, control for closing the first motor-operated valve is performed. A second motor-operated valve for guiding the water supply from the water supply source into the water supply tank;
When it is determined by the water level sensor that the stored water level in the water supply tank has fallen below a third water level lower than the first water level, control is performed to open the second motor-operated valve, and the water level sensor When it is determined that the water storage level in the water supply tank is higher than the fourth water level higher than the third water level and lower than the first water level, control for closing the second motor-operated valve is performed. The steam generation system according to claim 3 or 5. The water tank is
When the water storage level in the water supply tank falls below a third water level lower than the first water level, water supply starts from the water supply source, and exceeds a fourth water level higher than the third water level and lower than the first water level. The steam generation system according to claim 3, further comprising a ball tap that stops water supply from the water supply source.

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