JP4369278B2 - Hot water supply system - Google Patents

Description

  The present invention relates to a hot water supply heat source system including a cogeneration hot water supply heat source device that supplies hot water accumulated in a hot water storage tank to a hot water supply destination using exhaust heat of a power generation device such as a polymer electrolyte fuel cell (PEFC). It is about.

  In recent years, as a system capable of achieving an energy saving effect, for example, a cogeneration hot water supply heat source device that supplies hot water accumulated in a hot water storage tank to a hot water supply destination using waste heat of a power generation device such as a polymer electrolyte fuel cell It has been proposed (see, for example, Patent Document 1).

  FIG. 4 shows an example of a cogeneration hot water supply heat source device. The cogeneration hot water supply heat source device 3 includes a power generation device 1 and a hot water storage tank 2, and the hot water storage tank 2 introduces water into the hot water storage tank 2 and a hot water supply path 12 that supplies hot water from the hot water storage tank 2. It has. A hot water temperature detection sensor 100 is provided in the hot water supply path 12.

  Between the hot water storage tank 2 and the power generation device 1, a cooling water introduction passage 13 and a waste hot water introduction passage 14 are provided. The cooling water introduction passage 13 uses the water in the hot water storage tank 2 as cooling water for the power generation device 1. The water is introduced into the power generation device 1 side and heated by exhaust heat generated during power generation by the power generation device 1 to form hot water having a temperature of, for example, 60 ° C., and is accumulated in the hot water storage tank 2 through the exhaust heat hot water introduction passage 14.

  That is, the cooling water introduction passage 13 and the exhaust hot water introduction passage 14 are paths through which the water in the hot water storage tank 2 is introduced into the power generation device 1 and the water is heated by using the exhaust heat of the power generation device 1 and led to the hot water storage tank 2. The exhaust heat recovery hot water circulation passage 47 functions in the forward direction, and the exhaust heat recovery hot water circulation passage 47 is provided with a circulation pump 46. The cogeneration hot water supply heat source device 3 is configured to accumulate hot water formed through the exhaust heat recovery hot water circulation passage 47 in the forward direction in the hot water storage tank 2 when recovering the exhaust heat of the power generation device 1.

  A drainage passage 15 for draining the water in the hot water tank 2 is provided below the hot water tank 2, and a drain valve 52 is provided in the drainage passage 15. A pressure relief passage 16 is provided above the hot water storage tank 2, and an overpressure relief valve 50 is provided in the pressure relief passage 16. The hot water tank 2 is usually filled with hot water or water. In this figure, the region filled with hot water is indicated by hatching in order to make the drawing easy to understand.

  In the cogeneration hot water supply heat source device 3, when the power generation device 1 is activated, water stored in the lower part of the hot water tank 2 is introduced into the power generation device 1 through the cooling water introduction passage 13, and is discharged when the power generation device 1 generates power. The hot water is heated to be hot water, and this hot water is introduced into the hot water tank 2 from the upper side of the hot water tank 2 through the exhaust hot water introduction passage 14. When this operation is repeated, the water on the lower side of the hot water tank 2 is converted into hot water by the exhaust heat of the power generator 1 and introduced into the upper side of the hot water tank 2, so that the hot water tank 2 shown by the broken line A in FIG. The boundary line between the water and hot water inside moves to the lower side of the hot water tank 2.

  Note that if the hot water tank 2 is completely filled with hot water, the cooling power cannot be introduced into the power generation device 1, so that the power generation by the power generation device 1 cannot be performed.

  Further, when the hot water in the hot water tank 2 is supplied to an appropriate hot water supply place through the hot water supply path 12, water is supplied from the water supply path 11 into the hot water tank 2 by the amount of hot water reduced by this water supply. A boundary line between water and hot water in the hot water tank 2 indicated by a broken line A in FIG.

  The cogeneration hot water supply heat source device 3 as described above is often used in combination with, for example, an auxiliary hot water supply heat source device including a hot water heater. When the auxiliary hot water supply heat source device and the cogeneration hot water supply heat source device 3 are provided side by side, a complex hot water supply heat source system is formed.

JP2003-120998

  By the way, in the cogeneration hot water supply heat source device 3 provided with the power generation device 1 of the fuel cell as described above, power generation cannot be performed until the inside of the fuel cell reaches a certain temperature (power generation start possible temperature). In the meantime, heat storage (hot water accumulation) cannot be performed in the hot water tank 2, and there is a problem that it takes time to start up the system.

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to start up in a short time in a hot water supply heat source system having a cogeneration hot water supply heat source device equipped with a power generation device for a fuel cell. It is to provide a hot water supply heat source system.

In order to achieve the above object, the present invention is a means for solving the problems with the following configuration. That is, the first invention is a hot water supply heat source system including a cogeneration hot water supply heat source device for supplying hot water accumulated in a hot water storage tank to a hot water supply destination using exhaust heat of the power generation device, wherein the power generation device provides preheating. The start-up time can be shortened by a cooling water introduction passage that introduces water from the hot water storage tank into the power generation device, and is introduced into the power generation device between the hot water storage tank and the power generation device. An exhaust hot water introduction passage for guiding hot water heated by the use of exhaust heat of the power generation device to the hot water storage tank is provided, and a circulation pump is provided in the cooling water introduction passage, and when the exhaust heat of the power generation device is recovered, A structure in which water in the hot water storage tank is introduced into the power generation device through the cooling water introduction passage by driving a circulation pump, the water is heated by using the exhaust heat of the power generation device, and is led to the hot water storage tank through the waste heat water introduction passage; A bypass passage that bypasses the cooling water introduction passage and the exhaust hot water introduction passage on the suction port side of the circulation pump is provided, and the exhaust hot water introduction passage is provided at a communication portion between the bypass passage and the exhaust hot water introduction passage. Is provided with a three-way valve that selectively switches the hot water flow path passing through either the hot water storage tank side or the bypass passage side to monitor information related to detection of the amount of heat stored in the operating status of the cogeneration hot water supply heat source device. a heat storage amount detection unit for obtaining a value corresponding to the amount of stored heat of the hot water in the hot water tank on the basis of a power generator activation detection unit for detecting a timing of starting the power generator, the power generation device for supplying pre-heated at the start of pre-Symbol power generator startup preheating supply means and is provided, power-generating device startup preheating supply means, activating the power generating device when the first operation of the system before accumulating hot water in said hot water storage tank In this case, the three-way valve is switched to the bypass passage side, the circulation pump is driven, and hot water passing through the exhaust hot water introduction passage is introduced into the power generator through the bypass passage and the cooling water introduction passage. Thus, the configuration is configured to supply preheating to the power generation device, and is used as a means for solving the problem.

Further, in the second invention, in addition to the configuration of the first invention, the preheating supply means at the time of starting the power generator starts the power generator when the value corresponding to the heat storage amount obtained by the heat storage amount detection unit is equal to or greater than a hot water feed threshold. When the activation of the power generation device is detected by the detector, the three-way valve is switched to the hot water storage tank side, and the hot water in the hot water storage tank is removed by driving the circulation pump in the direction opposite to that during the exhaust heat recovery of the power generation device. This is a means for solving the problem by adopting a configuration in which preheating is supplied to the power generation device by introducing it into the power generation device through the exhaust hot water introduction passage for a predetermined hot water feed setting time . Furthermore, in the third invention, in addition to the configuration of the first or second invention, the cooling water introduction passage draws hot water stored in the hot water storage tank from the bottom of the hot water storage tank and removes the hot water from the hot water storage tank. Means for solving the above problems with a configuration that directly leads to the power generation apparatus, and the exhaust hot water introduction passage directly introduces the hot water heated by using the exhaust heat of the power generation apparatus into the hot water storage tank from the upper side of the hot water storage tank. It is made.

Further, the fourth invention is an auxiliary hot water supply heat source device having a function of supplying hot water prepared by heating the water flow to the hot water supply destination in addition to the configuration of the first, second or third invention. A hot water storage tank of the cogeneration hot water supply heat source device has a hot water supply passage for supplying hot water from the hot water storage tank, and the hot water supply passage communicates with a water supply inlet of the auxiliary hot water supply heat source device. When hot water is supplied using only the hot water in the hot water storage tank as a heat source, the hot water in the hot water storage tank is supplied to the hot water supply destination via an auxiliary hot water supply heat source device in a non-heated drive state as means for solving the problem.

Further, the fifth invention solves the problem with the structure of any one of the first to fourth inventions, in which the power generation device is a fuel cell that generates electricity by reacting hydrogen and oxygen. As a means to do.

According to the present invention, between the hot water storage tank and the power generation apparatus, a cooling water introduction path from the hot water storage tank to the power generation apparatus, and a waste heat hot water introduction path that guides the hot water heated by using the exhaust heat of the power generation apparatus to the hot water storage tank. By driving a circulation pump provided in the cooling water introduction passage, the water in the hot water storage tank is introduced into the power generation device through the cooling water introduction passage, and the water is heated by using the exhaust heat of the power generation device, and the water is introduced through the waste water introduction passage. Although it is configured to lead to the hot water storage tank, a bypass passage that bypasses the cooling water introduction passage and the exhaust hot water introduction passage on the suction port side of the circulation pump is provided , corresponding to the amount of heat stored in the hot water in the hot water storage tank When activation of the power generation device is detected when the value is less than a predetermined hot water feed threshold , the three-way valve provided in the communicating portion between the bypass passage and the exhaust hot water introduction passage is switched, and the circulation pump is driven Let me Since water in the generator unit side the hot water through the exhaust hot water inlet passage through said cooling water introducing passage and the bypass passage, it is possible to heat the inside power generator by the introduction of the hot water. Since the power generation device applied to the present invention shortens the startup time when preheating is applied, the present invention can realize a hot water supply heat source system that can be started in a short time.

Further, in the present invention, when the start of the power generation device is detected by the power generation device start detection unit when the value corresponding to the heat storage amount obtained by the heat storage amount detection unit is equal to or greater than the hot water feed threshold, the three-way valve is switched to the hot water tank side. In addition, the hot water in the hot water storage tank is introduced into the power generation device through the exhaust heat hot water introduction passage for a predetermined hot water feed setting time by driving the circulation pump in a direction opposite to that at the time of exhaust heat recovery of the power generation device. According to the configuration for supplying the preheating power-generating apparatus by, when the value corresponding to the heat storage amount is equal to or larger than the water feed threshold, hot water of the hot water storage tank exhaust heat recovery hot water circulation passage to take advantage provided for exhaust heat recovery Can be supplied to the power generator and the startup time of the power generator can be shortened, so that the system configuration can be simplified and a hot water supply heat source system that can efficiently exhibit the above-described effects can be realized.

  Further, in the present invention, an auxiliary hot water supply heat source device having a function of supplying hot water created by heating water to be supplied to a hot water supply destination is provided together with the cogeneration hot water supply heat source device. The hot water storage tank has a hot water supply path for supplying hot water from the hot water storage tank, and the hot water supply path is connected to the water supply introduction port of the auxiliary hot water supply heat source device, and when hot water supply is performed using only the hot water of the hot water storage tank as a heat source, According to the configuration in which hot water is supplied to the hot water supply destination via the auxiliary hot water supply heat source device in the non-heated drive state, the hot water supply passage supplied from the hot water storage tank of the cogeneration hot water supply heat source device, the water supply inlet of the auxiliary hot water supply heat source device, By connecting the two, a complex hot water supply system with a simple system configuration can be realized, and hot water can be supplied efficiently.

  Furthermore, in the present invention, according to the configuration in which the power generation device is a fuel cell that reacts hydrogen and oxygen to generate electricity, by using the power generation device as a fuel cell, a substance that adversely affects the environment is not discharged. Since the cogeneration hot water supply heat source device can be operated, an environmentally friendly hot water supply heat source system can be constructed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 shows a system configuration of an embodiment of a hot water supply apparatus according to the present invention, and FIG. 1 shows a control configuration thereof. As shown in FIG. 2, the present embodiment heats the water of the cogeneration hot water supply heat source device 3 that supplies the hot water accumulated in the hot water storage tank 2 to the hot water supply destination using the exhaust heat of the power generation device 1, and the water that passes through the water. This is a combined hot water supply system with an auxiliary hot water supply heat source device 4 for supplying hot water prepared in this manner to a hot water supply destination. In addition, in the cogeneration hot water supply heat source apparatus 3, the overlapping description about the same structure as FIG. 4 is abbreviate | omitted or simplified.

The power generator 1 applied in the present embodiment is formed by a fuel cell such as a polymer electrolyte fuel cell (PEFC), for example, and is extracted from a fuel such as city gas by the reverse reaction of water electrolysis. This is a device for generating electricity by reacting the generated hydrogen 2H ⁺ with oxygen (1/2) O ₂ in the air.

  The system having the cogeneration hot water supply heat source device 3 is attracting attention as a system capable of producing an energy saving effect. In particular, by forming the power generation device 1 with a fuel cell, a substance that adversely affects the environment is discharged. In addition, the cogeneration hot water supply heat source device 3 can be operated, and an environmentally friendly hot water supply device can be constructed.

  In the present embodiment, the capacity of the hot water tank 2 is, for example, 200 L, and the hot water tank 2 is provided with hot water temperature detection sensors 101 to 111 in the hot water tank at intervals. The drain valve 52 provided on the lower side of the hot water tank 2 is a drain solenoid valve.

  In the present embodiment example, the cogeneration hot water supply heat source device 3 and the auxiliary hot water supply heat source device 4 are connected to the hot water mixing unit 10 via the connection passage 45, and the outlet side of the hot water supply path 12 of the cogeneration hot water supply heat source device 3. Is provided with a flow rate sensor 70 for detecting the flow rate of hot water fed from the hot water supply passage 12. Further, a branch passage 11 b of the water supply passage 11 is connected to the hot water / mixing unit 10. A water supply temperature sensor 112 is provided in the water supply path 11.

  The hot water mixing unit 10 is supplied with water from the water supply path 11, a hot water on / off valve 54 that opens and closes the hot water supply path 12, a hot water proportional valve 55 that variably controls the flow rate of hot water supplied from the hot water supply path 12 according to the valve opening degree. And a flow rate sensor 71 provided on the inlet side of the connection passage 45. The hot water on / off valve 54 is formed by an electromagnetic valve, and the hot water proportional valves 55 and 56 are formed by a gear motor. A hot water temperature detection sensor 120 is provided on the outlet side of the hot water supply passage 12, and a hot water temperature detection sensor 118 is provided on the inlet side of the connection passage 45.

  The auxiliary hot water supply heat source device 4 is a device having a function of supplying hot water prepared by heating water flowing through water to a hot water supply destination, and has a hot water heater 5 (5a, 5b). The water heater 5 (5a, 5b) has combustion chambers 23, 24, respectively. In the combustion chamber 23 of the water heater 5 a, a burner 6, a combustion fan 8 that supplies and exhausts combustion of the burner 6, and a hot water supply heat exchanger 19 that is heated by the combustion of the burner 6 are provided. Further, in the combustion chamber 24 of the water heater 5b, a burner 7, a combustion fan 9 for supplying and exhausting combustion of the burner 7, and a reheating heat exchanger 25 heated by the combustion of the burner 7 are provided. Yes.

  Gas pipes 21 and 22 for supplying fuel to the burners 6 and 7 are connected to the burners 6 and 7, and these gas pipes 21 and 22 are branched from the gas pipe 20. The gas pipe 20 is provided with a gas on / off valve 80, the gas pipe 21 has a gas proportional valve 86 and gas on / off valves 81, 82, and 83, and the gas pipe 22 has a gas proportional valve 87 and a gas on the gas pipe 22. On-off valves 84 and 85 are interposed, respectively. These valves 80 to 87 are all formed by electromagnetic valves, the gas on-off valves 80 to 85 control the fuel supply / stop to the corresponding burners 6 and 7, and the gas proportional valves 86 and 87 correspond to the corresponding valves. The amount of fuel supplied to the burners 6 and 7 is controlled by the valve opening.

  A water supply introduction passage 18 is provided on the inlet side of the hot water heat exchanger 19, and this water supply introduction passage 18 is connected to the connection passage 45. A flow rate sensor 73 that detects the amount of hot water flowing through the water supply introduction passage 18 is provided on the inlet side of the water supply introduction passage 18.

  A hot water supply passage 26 is provided on the outlet side of the hot water supply heat exchanger 19, and the front end side of the hot water supply passage 26 is connected to the water supply introduction passage 18 via a branch passage 90 and a hot water passage switching valve 58. The hot water supply passage 26 is provided with a hot water temperature detection sensor 113 on the downstream side of the junction of the branch passage 90, and a hot water temperature detection sensor 114 is provided on the hot water supply heat exchanger 19 side. An overheat prevention device (thermostat) 115 is provided in the middle of the hot water supply heat exchanger 19.

  One end side of the forward pipe 91 is connected to one end side of the reheating heat exchanger 25, and the other end side of the forward pipe 91 is connected to the bathtub 126 via a circulation fitting 97. Further, a passage 93 is connected to the other end side of the reheating heat exchanger 25, and the other end side of the passage 93 is connected to a discharge port of the circulation pump 94. One end side of the return pipe 96 is connected to the suction port of the circulation pump 94, and the other end side of the return pipe 96 is connected to the bathtub 126 through the circulation fitting 97. The return pipe 96 is provided with a bathtub hot water temperature detection sensor 127.

  Reheating for recirculating hot water in the bathtub by circulating the hot water in the bathtub 126 by driving the circulation pump 94 by the outgoing pipe 91, the reheating heat exchanger 25, the passage 93, the circulation pump 94, and the return pipe 96. A circulation passage 99 is formed.

  Also, the hot water supply passage 26 is provided downstream of the formation portion of the branch passage 90 and the arrangement portion of the tapping hot water temperature detection sensor 113, and the pouring introduction passage for bath as a hot water supply passage from the hot water supply source to the bathtub 126. 95 is connected, and the bath pouring introduction passage 95 is connected to the passage 93. The bath pouring introduction passage 95 is provided with a hot water on / off valve 59, a check valve 62, a flow rate sensor 74, and a water level sensor 125. The water level sensor 125 detects the water level of the bathtub 126 by water pressure.

  A hot water filling passage is constituted by the passage from the hot water supply heat exchanger 19 through the hot water supply passage 26, the bath pouring introduction passage 95, the passage 93, the reheating heat exchanger 25, and the outgoing pipe 91 to the bathtub 126 in this order. ing.

  In FIG. 2, a hot water supply place such as a kitchen and a bathtub 126 are shown as hot water supply destinations, but various hot water supply systems that supply hot water to appropriate hot water supply destinations such as a bathroom shower can be configured.

  The system configuration of this embodiment is configured as described above. Next, the control configuration of the control device 44 shown in FIG. 1 will be described. The control device 44 includes a heat storage amount detection unit 35, a selection control unit 36, a combustion control unit 42, a clock mechanism 41, a power generation device activation detection unit 37, and a power generation device activation hot water feed unit 38.

  The heat storage amount detection unit 35 obtains a value corresponding to the heat storage amount of hot water in the hot water tank 2 based on monitor information related to detection of the heat storage amount of the operation status of the cogeneration hot water supply heat source device 3. The monitor information is, for example, information on the temperature detected by the hot water temperature detection sensors 101 to 111 in the hot water tank, information on the operating time of the power generator 1, and the like. The operating time of the power generation device 1 can be obtained from, for example, on / off information of the power generation device 1 and time information obtained from the timepiece mechanism 41. In addition, if a flow sensor is provided in the exhaust hot water introduction passage 14, information on the operation time of the power generation apparatus 1 can be obtained from information on the flow sensor.

  Here, an example of how to obtain a value corresponding to the heat storage amount of hot water in the hot water tank 2 is shown. For example, as the monitor information, the heat storage amount detection unit 35 takes in information on the temperature detected by the hot water temperature detection sensors 101 to 111 in the hot water tank, and the temperature detected by the hot water temperature detection sensor 105 in the hot water tank is about 60 ° C. If the temperature detected by the water temperature detection sensor 106 is about 20 ° C., the boundary line between the water and hot water in the hot water tank 2 as shown by the broken line A in FIG. 4 indicates the hot water temperature detection sensor 105 in the hot water tank and the hot water tank. It is determined that about 80 L of hot water at about 60 ° C. is accumulated in the hot water storage tank 2 between the internal hot water temperature detection sensor 106.

  In addition, the value corresponding to the heat storage amount of the hot water in the hot water tank 2 obtained based on the information of the detected temperature by the hot water temperature detection sensors 101 to 111 in the hot water tank is a value obtained by direct measurement. Therefore, although it can also be called the heat storage amount of the hot water in the hot water storage tank 2, in this application, the value calculated | required as mentioned above is also called the value corresponding to the heat storage amount.

  Moreover, if the amount of hot water accumulated per unit time due to the operation of the power generation device 1 is given in advance to the heat storage amount detection unit 35 and this amount is, for example, 2 L per minute, the operation of the power generation device 1 obtained from the timepiece mechanism 41 is performed. When the time information has passed 30 minutes, the heat storage amount detection unit 35 determines that 60 L of hot water at about 60 ° C. has been accumulated in the hot water storage tank 2. As described above, the heat storage amount detection unit 35 can detect the amount of hot water in the hot water storage tank 2 from time to time based on the operating time information of the power generation device 1 obtained from the timepiece mechanism 41, and obtain a value corresponding to the heat storage amount. Can be sought.

  Further, the heat storage amount detection unit 35 calculates the amount of hot water used in the hot water storage tank 2 from, for example, detection data of the flow rate sensor 70 and subtracts this value from the amount of hot water stored in the hot water storage tank 2, thereby The amount of hot water remaining in the tank 2 can be detected from moment to moment, and the temperature of the hot water accumulated in the hot water storage tank 2 can be estimated from the elapsed time since the accumulation of hot water. The corresponding value can be determined.

  The selection control unit 36 is a hot water supply heat source selection control unit. For example, a value corresponding to the heat storage amount obtained by the heat storage amount detection unit 35 falls below a predetermined lower threshold for hot water supply heat source selection. When hot water is supplied, the hot water supply heat source is switched from the hot water storage tank 2 to the auxiliary hot water supply heat source device 4 to perform hot water supply. Further, the selection control unit 36, when the value corresponding to the heat storage amount of the hot water in the hot water storage tank 2 obtained by the heat storage amount detection unit 35 rises above a predetermined upper threshold value for hot water supply heat source selection Switches the hot water supply heat source from the auxiliary hot water supply heat source device 4 to the hot water storage tank 2 of the cogeneration hot water supply heat source device 3 to perform hot water supply.

  In addition, the selection control of the hot water supply heat source by the selection control unit 36 is not particularly limited, and is appropriately set.

  In the present embodiment, a hot water supply passage (hot water supply path 12) fed from the hot water storage tank 2 of the cogeneration hot water supply heat source device 3 is communicated with a water supply inlet of the auxiliary hot water supply heat source device 4. When only hot water is used as a heat source and hot water of a set temperature or higher is sent from the hot water storage tank 2, the hot water of the hot water storage tank 2 is supplied to the hot water supply destination via the auxiliary hot water supply heat source device 4 in a non-heated drive state. Yes.

  That is, when hot water is supplied using only hot water in the hot water tank 2 as a heat source, the selection control unit 36 opens the hot water on / off valve 54 and adjusts the valve opening amounts of the hot water proportional valves 55 and 56 as appropriate. Hot water is mixed with water supplied from the water supply passage 11 via the branch passage 11b and sent to the auxiliary hot water supply heat source device 4 in a non-heated drive state as hot water at a set temperature. Then, for example, hot water having a set temperature introduced into the auxiliary hot water supply heat source device 4 is switched to the hot water path switching valve 58 to supply hot water to an appropriate hot water supply destination such as a kitchen through the branch passage 90, or the hot water open / close valve 59 is opened. Hot water filling is performed through the hot water introduction passage 95 and the hot water filling passage.

  Further, when the hot water supply heat source is switched to the auxiliary hot water supply heat source device 4, the selection control unit 36 closes the hot water on / off valve 54, for example, and supplies water introduced into the hot water mixing unit 10 from the water supply passage 11 through the branch passage 11 b. The hot water heater 5a is introduced through the connection passage 45, and a command is given to the combustion control unit 42 of the hot water heater 5a, and the hot water heater 5a is operated to supply hot water by the auxiliary hot water supply heat source device 4.

  When the selection control unit 36 selects the hot water supply operation from the auxiliary hot water supply heat source device 4, the combustion control unit 42 refers to the flow rate detected by the flow rate sensor 73 and turns on at least one of the gas on-off valves 81, 82, 83. Open and adjust the valve opening amount of the gas proportional valve 86 to adjust the amount of gas supplied to the burner 6 and also adjust the air volume of the combustion fan 8 to set the hot water discharged through the hot water supply heat exchanger 19. Combustion control of the burner 6 is performed so that the temperature becomes hot water.

  The power generation device activation detection unit 37 detects the activation timing of the power generation device 1 and applies a power generation device activation signal to the power generation device activation hot water feeding means 38 when the power generation device 1 is activated.

  The hot water feed means 38 at the time of starting the power generation device takes in the heat storage amount of hot water in the hot water storage tank 2 detected every moment by the heat storage amount detection unit 35, and generates power when this value is equal to or greater than a predetermined hot water feed threshold. When a power generator activation signal is applied from the apparatus activation detector 37, hot water in the hot water storage tank 2 is fed to the power generator 1 side for a predetermined hot water feed set time. In addition, since the hot water feeding threshold value should just be a value which can heat the electric power generating apparatus 1, a small value can be given like 10L, for example, if it is 60 degreeC hot water.

  The hot water is supplied through the hot water feed passage 48 provided between the power generation device 1 and the hot water storage tank 2 and capable of introducing the hot water in the hot water storage tank 2 to the power generation device 1 side. In the present embodiment, the hot water feed means 38 at the time of starting the power generator uses the exhaust hot water introduction passage 14 of the exhaust heat recovery hot water circulation passage 47 as the hot water feed passage 48 for the hot water feed set time, thereby circulating the pump 46. The hot water in the hot water storage tank 2 is introduced into the power generator 1 by circulating the hot water in the exhaust heat recovery hot water circulation passage 47 in the reverse direction by driving.

  In addition, when accumulating the hot water in the hot water tank 2 and starting the power generator 1 at the first operation of the system, for example, the three-way valve 53 is adjusted so that the hot water is not circulated to the hot water tank 2 side. The power generator 1 is started by circulating only on the side.

  The present embodiment is configured as described above, and at the time of exhaust heat recovery of the power generator 1, the water in the hot water storage tank 2 is passed forward through the exhaust heat recovery hot water circulation passage 47 to use the exhaust heat of the power generator 1. By accumulating hot water formed by heating in the hot water storage tank 2, hot water is accumulated in the hot water storage tank 2, hot water supply using the hot water in the hot water storage tank 2 as a heat source is performed, and in some cases, an auxiliary hot water supply heat source Hot water supply using the device 4 as a heat source is performed as described above.

  Moreover, the following operation | movement is performed at the time of starting of the electric power generating apparatus 1. FIG. That is, the heat storage amount detection part 35 calculates | requires the value corresponding to the heat storage amount of the hot water in the hot water storage tank 2 based on the monitor information regarding the heat storage amount detection of the operation condition of the cogeneration hot water supply heat source device 3, and this value was predetermined. When the power generation device activation detection unit 37 detects the activation of the power generation device 1 when the hot water supply threshold value is exceeded, the power generation device activation hot water feed means 38 is configured to discharge the hot water in the exhaust heat recovery hot water circulation passage 47 for the hot water feed set time. The introduction passage 14 is used as the hot water feed passage 48, and the hot water in the hot water storage tank 2 is introduced into the power generator 1 by circulating the hot water in the exhaust heat recovery hot water circulation passage 47 in the reverse direction by the reverse rotation of the circulation pump 46. .

  Therefore, according to the present embodiment, the hot water in the hot water storage tank 2 can be introduced into the power generation device 1 and warmed up when the power generation device 1 of the fuel cell is started, so that the fuel cell can generate power at a temperature at which power generation can be started. The hot water supply heat source system can be realized in a short time and can be started in a short time.

  Further, according to the present embodiment, the start-up time of the power generator 1 can be shortened as described above by using the exhaust heat recovery hot water circulation passage 47 provided for exhaust heat recovery as the hot water feed passage 48, so that the system The configuration can be simplified, and a hot water supply heat source system that can efficiently exhibit the above-described effects can be realized.

  Furthermore, according to the present embodiment, since it is a complex hot water supply device having the cogeneration hot water supply heat source device 3, hot water supply that can save energy by performing a hot water supply operation using the cogeneration hot water supply heat source device 3 as a hot water supply heat source. A device can be realized.

  Furthermore, according to the present embodiment, a hot water supply passage (hot water supply path 12) fed from the hot water storage tank 2 of the cogeneration hot water supply heat source device 3 is communicated with the water supply inlet of the auxiliary hot water supply heat source device 4. When hot water is supplied using only hot water as the heat source, the hot water in the hot water storage tank 2 is supplied to the hot water supply destination via the auxiliary hot water supply heat source device 4 in a non-heated drive state, so that water is supplied from the hot water storage tank 2 of the cogeneration hot water supply heat source apparatus 3. By connecting the hot water supply passage to the hot water supply inlet of the auxiliary hot water supply heat source device 4, the system configuration can be simplified and hot water can be supplied efficiently.

  In addition, this invention is not limited to the said embodiment, It can take various aspects. For example, in the above embodiment, the exhaust heat recovery hot water circulation passage 47 provided for exhaust heat recovery is used as the hot water feed passage 48 so that hot water in the hot water storage tank 2 is moved to the power generation device 1 side when the power generation device 1 is started. However, a hot water feed passage may be provided separately from the exhaust heat recovery hot water circulation passage 47, and the hot water in the hot water storage tank 2 may be sent to the power generator 1 through the hot water feed passage.

  In the above embodiment, the water supply channel 11 is connected to the water supply introduction passage 18 of the auxiliary hot water supply heat source device 4 via the hot water mixing unit 10, but as shown in FIG. It may be connected to the hot water supply passage 26 side through the valve 69, or the water supply passage 11 is connected to both the water supply introduction passage 18 and the hot water supply passage 26 through the valve 69 as shown in FIG. May be.

  Furthermore, in the above embodiment, the power generation device 1 of the cogeneration hot water supply heat source device 3 is a fuel cell. However, a gas turbine power generation device, a diesel engine power generation device, a gasoline engine power generation device, or the like can be applied to the power generation device 1. In addition, heat storage in the hot water storage tank 2 may be performed using the exhaust heat of the power generation system, and the fuel and configuration of the power generation apparatus 1 are not particularly limited, and are appropriately set.

  For gas turbine power generators, diesel engine power generators, and gasoline engine power generators, depending on the size of the engine, etc., for example, by supplying hot water several tens of minutes before the start timing, the engine oil etc. is warmed, By reducing the viscosity, the energy required for starting up (preheating with an electric heater, afterglow after starting, etc.) can be reduced, and the engine or the like can be started easily.

  Further, in the above embodiment, the hot water supply path 12 of the hot water storage tank 2 of the cogeneration hot water supply heat source device 3 is communicated with the water supply inlet of the auxiliary hot water supply heat source device 4 via the hot water mixing unit 10 and the connection passage 45. In the invention, the cogeneration hot water supply heat source device 3 and the auxiliary hot water supply heat source device 4 may be provided separately and provided side by side.

  Furthermore, in the said embodiment, although it was set as the composite hot water supply system which has the cogeneration hot water supply heat source device 3 and the auxiliary hot water supply heat source device 4, it is good also as a hot water supply system which abbreviate | omitted the auxiliary hot water supply heat source device 4.

It is a principal part block diagram which shows the control structure of one Embodiment of the hot-water supply heat source system which concerns on this invention. It is a principal part block diagram which shows typically the system configuration | structure of one Example of the hot water supply heat source system which concerns on this invention. It is principal part explanatory drawing which shows typically the connection structure of the hot water supply heat source system applied to other example embodiments of the present invention and the water supply path of the cogeneration hot water supply heat source device. It is explanatory drawing which shows typically the structural example and its operation | movement of a cogeneration hot-water supply heat source apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power generation device 2 Hot water storage tank 3 Cogeneration hot water supply heat source device 4 Auxiliary hot water supply heat source device 5 Water heater 14 Waste hot water introduction passage 35 Heat storage amount detection part 36 Selection control part 37 Power generation device starting detection part 38 Power generation device starting hot water feed means 44 Control Device 47 Waste heat recovery hot water circulation passage 48 Hot water feed passage 101-111 Hot water temperature detection sensor in hot water storage tank

Claims (5)

In a hot water supply heat source system having a cogeneration hot water supply source that supplies hot water accumulated in a hot water storage tank to the hot water supply destination using exhaust heat of the power generation device, the power generation device has a configuration that can shorten the startup time by applying preheating. And between the hot water storage tank and the power generation device, a cooling water introduction passage for introducing the water in the hot water storage tank into the power generation device, and heating by using the exhaust heat of the power generation device introduced into the power generation device. A hot water introducing passage for guiding the hot water to the hot water storage tank is provided, and a circulating pump is provided in the cooling water introducing passage, and the hot water storage tank is driven by the circulation pump when recovering the exhaust heat of the power generator. Water is introduced into the power generation device through the cooling water introduction passage, the water is heated by using the exhaust heat of the power generation device, and is led to the hot water storage tank through the waste heat hot water introduction passage. A bypass passage that bypasses the cooling water introduction passage and the exhaust hot water introduction passage on the mouth side is provided, and a flow of hot water passing through the exhaust hot water introduction passage is provided at a communication portion between the bypass passage and the exhaust hot water introduction passage. A three-way valve is provided for selectively switching the path between the hot water tank side and the bypass passage side, and in the hot water tank based on the monitor information regarding the heat storage amount detection of the operating status of the cogeneration hot water source a heat storage amount detection unit for obtaining a value corresponding to the heat storage amount of the hot water, power generator activation detection unit and the power generating device startup preheating supply means for supplying a preheating when starting the previous SL generation device for detecting the start timing of the generator device Doo is provided, power-generating device startup preheating supply means, sometimes activating the power generator at the first operation of the system before accumulating hot water in said hot water storage tank, before the three-way valve Switch to the bypass passage side, drive the circulation pump, and supply hot water passing through the exhaust hot water introduction passage to the power generation device through the bypass passage and the cooling water introduction passage to supply preheat to the power generation device A hot water supply heat source system characterized in that it is configured to perform.   The preheating supply means at the time of starting the power generation device is configured so that when the value corresponding to the heat storage amount obtained by the heat storage amount detection unit is equal to or greater than the hot water feed threshold, the power generation device start detection unit detects the start of the power generation device, The hot water in the hot water storage tank is passed through the exhaust hot water introduction passage for a predetermined hot water feed set time by driving the circulation pump in a direction opposite to that at the time of exhaust heat recovery of the power generator. The hot water supply heat source system according to claim 1, wherein preheating is supplied to the power generator by introducing the hot water supply system.   The cooling water introduction passage draws hot water stored in the hot water storage tank from the bottom of the hot water storage tank and guides the hot water directly from the hot water storage tank to the power generation device, and the exhaust hot water introduction passage is heated by using the exhaust heat of the power generation device. The hot water supply heat source system according to claim 1 or 2, wherein the hot water is directly introduced into the hot water tank from the upper side of the hot water tank.   An auxiliary hot water supply heat source device having a function of supplying hot water created by heating water to the hot water supply destination is provided together with the cogeneration hot water supply heat source device, and the hot water storage tank of the cogeneration hot water supply heat source device is a hot water storage tank. A hot water supply passage for supplying hot water is connected to the water supply introduction port of the auxiliary hot water supply heat source device, and when hot water supply is performed using only the hot water in the hot water storage tank as a heat source, the hot water in the hot water storage tank is driven without heating. The hot water supply heat source system according to claim 1, wherein the hot water supply system is configured to supply hot water to a hot water supply destination via the auxiliary hot water supply heat source device.   The hot water supply heat source system according to any one of claims 1 to 4, wherein the power generation device is a fuel cell that generates electricity by reacting hydrogen and oxygen.

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