JP6487627B2 - Heat source device, heat source control program, and fuel cell cogeneration system - Google Patents

Description

  The present invention relates to, for example, a heat source technique used for an auxiliary heat source of a fuel cell cogeneration system and a technique for using the same.

  The fuel cell cogeneration system uses an auxiliary heat source that burns fuel gas and exchanges the heat of combustion with a heat medium.

In a fuel cell cogeneration system, it is known to use a gas burner as an auxiliary heat source (Patent Document 1).

JP 2008-15997A

  By the way, in a fuel cell cogeneration system using a fuel gas such as city gas, the consumption amount of the fuel gas is monitored by a microcomputer meter. This microcomputer meter has a gas shut-off function that detects gas leaks and shuts off the gas supply. Such a gas shut-off function is a highly convenient function that is indispensable for safety because it quickly detects an emergency such as a gas leak and shuts off the gas.

  However, when the continuous operation of the fuel cell cogeneration system is not an emergency such as a gas leak, the gas consumption will not fluctuate and the gas will be shut off by the microcomputer meter even if there is continuous consumption. There is. In other words, since it is not an emergency such as a gas leak, it is a malfunction of the microcomputer meter.

  When such a gas shut-off function operates, the fuel cell cogeneration system stops and is forced to restart. Depending on the system, there are inconveniences that it takes time for re-operation and hinders stable system operation.

  Such a problem is not limited to the fuel cell cogeneration system, and there is a problem that the microcomputer meter malfunctions due to stable continuous consumption of fuel gas over a long period of time.

  Such a problem is not limited to the gas supply cut-off by the automatic cut-off function of the gas meter, but is the same when the continuous combustion is prevented on the heat source device side.

  Therefore, in view of the above problems, the first object of the technology of the present disclosure is to provide a heat source device that can prevent automatic gas shut-off during normal operation and maintain the continuous consumption of fuel gas.

A second object of the technology of the present disclosure is to prevent automatic gas shut-off during normal operation and maintain continuous consumption of fuel gas.

In order to achieve the above object, according to one aspect of the heat source device of the present disclosure, the heat source device is connected to a separately installed tank unit and burns fuel gas to heat the water supplied from the tank unit to supply hot water. a is a burner for combusting the fuel gas, a device in the circulation path for circulating the set with the heat medium in the apparatus, a first heat exchanger for exchanging heat in the heating medium the combustion heat of the burner , A second heat exchanger for exchanging heat of the heat medium to the feed water from the tank unit, a first timing means for measuring the unburned time of the burner, and a measurement by the first timing means When the unburned time exceeds the first set time, the burner starts to burn, and the burner combustion is set to the second while suppressing the boiling of the heat medium circulating in the in-device circulation path. moves to force combustion to continue time, forcible fuel Comprising upon receiving a water supply from the tank unit during the transition from forced combustion hot water supply operation, and a control unit for the feed water to heat exchange the heat of the heating medium in the second heat exchanger from the tank unit.

The heat source apparatus further includes a circulation pump, includes a circulation path in the apparatus, and circulates the heat medium in the first heat exchanger, and is supplied from the downstream side of the gas meter having a gas shutoff function. And a controller that forcibly burns the burner in accordance with an operation state of the external device that consumes the fuel gas or based on consumption information of the fuel gas from the external device.

In the heat source apparatus, and a second timer means for measuring a combustion time before Symbol burner, when the burning time exceeds a third predetermined time, control to reset the count time of the first timer means May be provided.

  The heat source device includes an air supply fan and a temperature sensor that detects a temperature of the heat medium, and when the heat medium temperature exceeds a predetermined temperature, the control unit lowers the heat medium temperature to the predetermined temperature. Until then, the air supply fan may be operated.

In the heat source apparatus, the control unit in a forced combustion prior Symbol burner heating operation to heat the heat source device during the cooling operation of the standby or the heating medium shifts to forcible combustion, the hot water supply operation or bath additionally fired If the behavior occurs, these heating operation, the hot water supply operation or bath additionally焚動operation, the forced combustion, may be preferentially relative to the stand and the cooling operation.

In order to achieve the above object, according to one aspect of the heat source control program of the present disclosure, there is provided a heat source control program for causing a computer to execute an unburned time of a burner provided in the heat source device for burning fuel gas. Measure and monitor the water supply to the heat source device from a tank unit installed separately from the heat source device, and start burning of the burner when the unburned time exceeding the first set time is measured by, said combustion of the burner while suppressing the boiling of the heating medium circulating in the heating medium passage in the heat source apparatus is shifted to a forced combustion to continue the second set time, the heating medium the combustion heat of the burner heat exchanger to the heat medium circulating in the path, when detecting the water supply from the tank unit in the forced combustion, is shifted to the hot water supply operation from the forced burning, the heat of the heating medium from the tank unit Water to execute processing for exchanging heat in the computer.

In the heat source control program, the operation status of an external device that consumes fuel gas supplied from a downstream side of a gas meter having a gas automatic shut-off function is monitored, or consumption information of the fuel gas is received from the external device, and the burner May be forcedly burned, and the computer may execute a process of exchanging heat of the burner combustion heat to a heat medium circulating in the heat medium path .

In the heat source control program, the heat medium temperature of the heat medium is measured, and when the heat medium temperature exceeds a predetermined temperature, an air supply fan is operated until the heat medium temperature drops to the predetermined temperature, and the heat medium A process for cooling the heat medium circulating in the medium path may be executed by the computer.

In the heat source control program, in a forced combustion prior Symbol burner heating operation to heat the combustion heat of the burner during the cooling operation of the standby or the heating medium shifts to forcible combustion, the hot water supply operation or tub add焚動work When it occurs, the computer may be caused to execute processing that preferentially executes the heating operation, the hot water supply operation, or the bathtub pursuit operation with respect to the forced combustion , the standby, and the cooling operation .

In order to achieve the above object, according to one aspect of the fuel cell cogeneration system of the present disclosure, a power generation unit that generates power using fuel gas supplied from a downstream side of a gas meter having a gas automatic shut-off function, and the power generation unit When the unburned time of the burner that burns the fuel gas exceeds the first set time, the heat storage means that collects and stores the exhaust heat is stored separately from the power generation unit and the heat storage means. The combustion of the burner is shifted to forced combustion to continue the combustion for a second set time while suppressing the boiling of the heat medium circulating in the heat medium path, and the heat of combustion of the burner is heated to the heat medium. heat source containing replacement receives feedwater from the heat storage means during forcible combustion shifts from the forced combustion hot water supply operation, a control unit for heat exchange to the feed water of the heat of the heating medium from the heat storage means And a location.

The heat source device described above may be used as the heat source device installed in the fuel cell cogeneration system.

  According to the technique of the present disclosure, any of the following effects can be obtained.

  (1) The heat source device according to the technology of the present disclosure can be selected and incorporated as an auxiliary heat source of an external device such as a fuel cell cogeneration system that consumes fuel gas, and can be used as an auxiliary heat source in an external device. Installation costs can be reduced compared to a dedicated device that integrates an auxiliary heat source.

  (2) When the fuel gas is forcibly burned, the existing heat medium path is used for the heat medium circulation, so that the equipment cost of the heat source device can be suppressed.

  (3) Gas consumption can be changed with respect to the continuous consumption of fuel gas from external equipment, and malfunction of the gas meter can be prevented.

  (4) Since malfunction of the gas meter due to continuous consumption of fuel gas can be prevented, external devices such as a fuel cell cogeneration system that consumes fuel gas can be operated continuously and stably.

  (5) When using an SOFC (Solid Oxide Fuel Cell) type fuel cell where the operating temperature of the fuel cell cogeneration system is high and it takes time to start and stop as an example of the external device described above In addition, efficient and constant power generation can be continuously performed over a long period of time.

(6) It is possible to construct a fuel cell cogeneration system that can avoid interruption of the microcomputer meter while reducing the system cost by changing the control software of a general heat source machine and using it as an auxiliary heat source.

It is a figure which shows an example of the fuel cell cogeneration system which concerns on one embodiment. It is a figure which shows the hot-water supply heating apparatus which is an example of a heat source machine. It is a figure which shows an example of the hot water supply and heating control part. It is a flowchart which shows an example of the process sequence of hot water supply heating control. It is a flowchart which shows an example of the process sequence of gas consumption determination. It is a flowchart which shows an example of the process sequence of forced combustion. It is a flowchart which shows an example of the process sequence of heating operation. It is a flowchart which shows an example of the process sequence of pouring operation. It is a flowchart which shows an example of the process sequence of a chasing operation | movement. It is a timing chart which shows an example of burner combustion and combustion monitoring operation. It is a flowchart which shows the modification of the process sequence of gas consumption determination. It is a timing chart which shows the modification of burner combustion and combustion monitoring operation. It is a figure which shows the hot-water supply heating apparatus which is an example of the heat-source equipment which concerns on other embodiment. It is a figure which shows the heating exclusive apparatus which is an example of the heat-source equipment which concerns on other embodiment.

<Fuel cell cogeneration system>

  FIG. 1 shows an example of a fuel cell cogeneration system according to an embodiment. The fuel cell cogeneration system (hereinafter simply referred to as “FC system”) 2 includes an FC (Fuel Cell) unit 4, a tank unit 6, a hot water heater / heater 8 and a remote control (hereinafter referred to as “remote control”). A device 10 is provided. In this embodiment, the FC unit 4 and the tank unit 6 are examples of external devices of the hot water supply / room heating device 8.

  The fuel gas G is supplied from the fuel supply path 12 to the FC unit 4 and the hot water heater / heater 8. The fuel gas G may be a combustion gas such as city gas or propane gas supplied from a cylinder installed at each demand point.

  A gas meter 14 is installed in the fuel supply path 12. For example, a microcomputer meter is used as the gas meter 14 to monitor and measure the amount of fuel gas G used. The gas meter 14 has an automatic gas cutoff function. This automatic gas shut-off function monitors the consumption state of the fuel gas G, and shuts off the gas supply when it is determined that there is a gas leak. If the change in the amount of consumed gas is within a predetermined range and the state continues for a certain time or more, even if no gas leak actually occurs, it is determined that there is a gas leak and the gas supply is shut off.

The FC unit 4 is an example of an external device for the fuel gas G. The FC unit 4 includes a reformer 16, a fuel cell 18, a heat exchanger 20-1, a circulation pump 22-1 and an FC control unit 26-1. The reformer 16 generates hydrogen (H ₂ ) and carbon monoxide (CO) necessary for power generation by reforming the supplied fuel gas G. For example, SOFC is used for the fuel cell 18, and power is generated using hydrogen or carbon monoxide provided from the reformer 16. In this SOFC, oxygen ions react with hydrogen and carbon monoxide to generate electricity and heat. This heat is processed as exhaust heat, and the exhaust heat recovered from the fuel cell 18 by the heat medium is exchanged with the water W by the heat exchanger 20-1. The water W is circulated to the tank unit 6 through the heat medium circulation path 24, and this circulation is performed by the circulation pump 22-1.

  The FC control unit 26-1 performs power generation control of the fuel cell 18 and drive control of the circulation pump 22-1. The FC control unit 26-1 is connected to the tank unit control unit 26-2 on the tank unit 6 side through the communication line 28-1, and the operation information of the FC unit 4 is transferred from the FC control unit 26-1 to the tank unit control unit 26. -2.

  The tank unit 6 is provided with a hot water storage tank 30. This hot water storage tank 30 is an example of a heat storage means for accumulating exhaust heat of the FC unit 4. The hot water storage tank 30 is, for example, a sealed tank that performs hierarchical heat storage, and low-temperature water on the lower layer side flows from the heat medium circulation path 24 to the heat exchanger 20-1, and high-temperature water heated by the heat exchanger 20-1 is upper layer. Back to the side. Thereby, the exhaust heat of the FC unit 4 is stored as water W that can be supplied with hot water.

  The heat medium circulation path 24 includes a first path 24-1 from the lower layer of the hot water storage tank 30 to the heat exchanger 20-1, and a second path from the heat exchanger 20-1 to the exhaust heat switching valve 32-1. , And a third path 24-3 that connects the upper layer portion and the lower layer portion of the hot water storage tank 30 via the exhaust heat switching valve 32-1. A temperature sensor 34-1 for detecting the exhaust heat temperature is installed in the path 24-2.

  A water supply path 36 is connected to the lower layer side of the hot water storage tank 30, and a hot water supply path 38 is connected to the upper layer side of the hot water storage tank 30. The water supply path 36 is connected to a hot water supply path 38 via a bypass path 39. The water supply path 36 includes a temperature sensor 34-2, a pressure reducing valve 32-2, a mixing valve 32-3, and a water amount sensor 40-1. The temperature sensor 34-2 detects the feed water temperature. The pressure reducing valve 32-2 reduces the feed water pressure. The mixing amount of the hot water supplied from the hot water supply passage 38 is adjusted by opening and closing the mixing valve 32-3. The water amount sensor 40-1 detects the amount of water supplied to the hot water storage tank 30 and measures the amount of water.

  The hot water supply passage 38 is provided with a water control valve 32-4 with a closing function, a hot water temperature sensor 34-3, and a mixed temperature sensor 34-4. The water control valve 32-4 with a closing function controls the amount of hot water HW flowing through the hot water supply passage 38. The hot water temperature sensor 34-3 detects the temperature of the hot water HW flowing from the hot water storage tank 30 to the hot water supply passage 38, and the mixed temperature sensor 34-4 detects the temperature of the hot water HW after mixing the water supply W. In this case, if the supply water W is not mixed with the hot water HW by closing the mixing valve 32-3 to the bypass passage 39, the detected temperature of the mixed temperature sensor 34-4 is equal to the detected temperature of the hot water temperature sensor 34-3. Become.

  The tank unit control unit 26-2 is connected to the hot water supply and heating control unit 26-3 and the remote control device 10 of the hot water supply and heating device 8 by the communication line 28-2. Therefore, the tank unit control unit 26-2 receives the operation information of the FC unit 4 from the FC control unit 26-1, refers to the control state of the FC unit 4, controls various valves in the tank unit 6, and the hot water heater / heater Linkage control with 8 is performed.

  The hot water heater / heater 8 is an example of a heat source machine that burns the fuel gas G. The hot water supply / room heating device 8 includes a water supply passage 42, a heat medium circulation passage 44, and a memory circulation passage 46. The heating medium circulation path 44 is an example of an in-device circulation path for the heating medium HM that circulates the heating medium HM only in the apparatus or mainly in the apparatus. The heat medium circulation path 44 includes heat exchangers 20-2, 20-3, and 20-4, a circulation pump 22-2, and a temperature sensor 34-5. A hot water supply path 38 is connected to the water supply path 42, and hot water HW flows from the hot water supply path 38 during hot water supply. The amount of hot water HW discharged from the water supply passage 42 is detected by a water amount sensor 40-2. A heating medium HM that is heating water circulates in the heating medium circulation path 44. The circulation pump 22-3 is driven to circulate the bathtub water BW in the tracking circulation path 46 when the bathtub 48 is chased.

  A heating / dissipating device 50 may be connected to the heat medium circulation path 44 as indicated by a broken line. Heat exchangers 20-2, 20-3, 20-4, a circulation pump 22-2, and a temperature sensor 34-5 are provided. The heat exchanger 20-2 performs heat exchange between the hot water HW supplied from the hot water supply passage 38 on the tank unit 6 side and the heat medium HM. The heat exchanger 20-3 exchanges the heat of combustion of the fuel gas G by the burner 52 with the heat medium HM. The heat exchanger 20-4 exchanges heat of the heat medium HM with the bath water BW. The circulation pump 22-2 is driven when the burner 52 is combusted, and circulates the heat medium HM through the heat medium circulation path 44 and the heating / radiating device 50 to perform heating. The burner 52 is set with a specific combustion mode capable of maintaining combustion while suppressing boiling of the heat medium HM. This specific combustion mode is one mode of the forced combustion mode in which the burner 52 is forcibly burned, and the combustion of the burner 52 is predetermined while suppressing the boiling of the heat medium HM that exchanges the heat of combustion of the fuel gas G of the burner 52. It is a combustion form that continues for a time. In this case, in the specific combustion mode, the combustion may be continued for a predetermined time while avoiding boiling of the heating medium HM. The duration of the combustion is determined by the flow rate of the heating medium HM, the gas type or amount of the fuel gas G, the supply Needless to say, it is determined by the amount of energy.

  In this hot water heater / heater 8, hot water is received from the tank unit 6, and when the temperature of the heat medium is low, the burner 52 is burned to exchange heat with the heat medium HM. Thus, the hot water is discharged from the hot water outlet of the water supply passage 42, and heat is radiated from the heating and radiating device 50 connected to the heating medium circulation passage 44, and the bathtub water BW of the bathtub 48 is circulated in the additional circulation passage 46. Reheating of the bath water BW can be performed. The amount of hot water HW discharged from the water supply passage 42 is detected by a water amount sensor 40-2.

  The remote control device 10 communicates with the tank unit control unit 26-2 and the hot water supply / heating control unit 26-3 through the communication line 28-2, and displays remote operation such as hot water supply, heating, or chasing and control information. .

  And in the hot water supply and heating apparatus 8, the malfunction by the automatic interruption | blocking function of the gas meter 14 is avoided by performing the forced combustion of the burner 52. FIG.

<Hot water heater 8>

  FIG. 2 shows an example of the hot water supply / heating device 8. 2, the same parts as those in FIG. 1 are denoted by the same reference numerals.

  This hot water heater / heater 8 supplies hot water with the hot water HW from the tank unit 6, heat exchange of the heat of the hot water HW to the heat medium HM, auxiliary heating of the heat medium HM, and heat of the heat medium HM to the bath water BW. It is an example of what is called a 1 can 3 water type heat source machine to exchange.

  A hatched portion attached to the heat medium circulation path 44 is a circulation path portion that circulates the heat medium when performing continuous combustion for a predetermined time for gas consumption. When the burner 52 of the hot water heater 8 is combusted, the circulation path of the circulating heat medium HM is lengthened so that the capacity of the heat medium HM is increased, and the combustion continuation time until boiling by heat exchange of the combustion heat is increased. It is extended. A heating medium tank 54 is installed in the heating medium circulation path 44, and the heating medium HM circulating through the heating medium circulation path 44 is stored.

  A hot water supply path 38 on the tank unit 6 side is connected to the water supply port 56 to supply hot water HW. With this water supply, hot water HW can be discharged from the hot water outlet 58. The water supply path 42 and the recirculation circuit 46 are connected by a pouring pipe 47, and hot water HW flows from the water supply line 42 to the memorial circuit 46 through the pouring line 47 and flows into the bathtub 48 during bath pouring. It is poured. Since this pouring is water supply of water W, which is an example of clean water, like hot water supply, it is an aspect of hot water supply.

  The branch pipes 59-1, 59-2, 59-3 of the heat medium circulation path 44 include, as an example of the heating and radiating device 50, a low temperature terminal 50-1 and a high temperature terminal 50-2 that radiate the heat of the heat medium HM. It is connected.

  In this embodiment, heat exchangers 20-5 and 20-6 are provided. A primary heat exchanger for exchanging sensible heat of combustion heat is used for the heat exchanger 20-3 described above. The heat exchanger 20-5 exchanges heat of combustion with the hot water HW that circulates in the water supply path 42. The heat exchanger 20-6 exchanges the combustion heat with the heat medium HM together with the heat exchanger 20-3. In this case, secondary heat exchangers that exchange the latent heat of the combustion heat are used for the heat exchangers 20-5 and 20-6.

  An air supply fan 62 for supplying air is installed in the combustion chamber 60 provided with the heat exchangers 20-3, 20-5, 20-6 and the burner 52. This air supply fan 62 is used for air cooling supply of the heat medium HM in a standby state in which the burner 52 shifts to the forced combustion mode.

  In this embodiment, the remote control device 10 includes, for example, a bathroom remote control 10-1 and a kitchen remote control 10-2.

<Control system 63>

  FIG. 3 shows an example of the control system 63 of the FC system 2. In FIG. 3, the same parts as those in FIG. The control system 63 includes an FC control unit 26-1, a tank unit control unit 26-2, and a hot water supply / heating control unit 26-3. This control system 63 is an example of the control means in the present invention, and each FC control unit 26-1, tank unit control unit 26-2, and hot water supply / heating control unit 26-3 are configured by a computer. Each of the communication lines 28-1 and 28-2 is, for example, a remote control line such as a two-line power supply line.

  The hot water supply / heating control unit 26-3 includes a processor 64, a memory 66, a no-combustion timer 68-1, a combustion time timer 68-2, an input / output unit (I / O) 70, and a communication interface 72. Connected and linked by.

  The processor 64 executes an OS (Operating System) and various programs in the memory 66 as an example of a storage unit, and performs information processing. This information processing includes processing of a gas shut-off function that avoids gas shut-off when the gas meter 14 is normal.

  The memory 66 includes, as an example, a program storage unit 76, a data storage unit 78, and a RAM (Random-Access Memory) 80. The program storage unit 76 stores an OS and various programs, and the programs include software and firmware for realizing the control program and control method of the present invention. The data storage unit 78 stores various data for executing the program and history information such as a blocking record. The program storage unit 76 and the data storage unit 78 may be non-volatile recording media. The RAM 80 constitutes a work area for information processing and temporarily stores various data being processed.

  The non-combustion timer 68-1 is an example of a first timing unit, and measures a time during which no gas is consumed in the combustor other than the FC unit 4, for example, the hot water supply / heating device 8. For example, the non-burning timer 68-1 always counts up as count information from the time when the burner 52 is extinguished.

  The combustion time timer 68-2 is an example of a second time measuring unit, and measures the continuous combustion time of the fuel gas G of the hot water supply / heating device 8. The combustion time timer 68-2 always counts up from the start of combustion of the burner 52. This counting of burning time includes forced burning time.

  Functional components including sensors such as a circulation pump 22-2, a temperature sensor 34-5, a water amount sensor 40-2, and an air supply fan 62 are connected to the I / O 70. The processor 64 is provided with combustion information and non-combustion information of the fuel gas G from the tank unit control unit 26-2 and the FC control unit 26-1 connected to the communication interface 72.

  The tank unit controller 26-2 and the remote control device 10 are connected to the communication interface 72 through a communication line 28-2. The FC control unit 26-1 is connected to the tank unit control unit 26-2 via the communication line 28-1, and is connected to the communication interface 72 via the communication line 28-1 and the tank unit control unit 26-2. Yes.

<Processing procedure of FC system 2>

  FIG. 4 shows the processing procedure of the FC system 2. In this processing procedure, initialization of the hot water supply / room heating device 8 is executed in this embodiment as initialization of the heat source machine (S11). This initialization is, for example, initialization of input / output of the hot water supply / heating control unit 26-3 when the power is turned on. After this initialization, the setting that the hot water supply / heating device 8 is incorporated in the FC system 2 is determined (S12). In this setting, it is checked whether or not the hot water supply / heating device 8 is set in the FC system 2. This setting is performed by a signal from the remote control device 10 or by switching the in-device SW. If it is the setting which incorporates the hot-water supply heater 8 in the FC system 2 (YES in S12), gas consumption is determined (S13). The determination of the consumption of the fuel gas G may be made when the hot water supply / heating control unit 26-3 receives the operation information of the FC control unit 26-1 via the tank unit control unit 26-2.

  Based on this determination result, it is determined whether forced combustion is necessary (S14). If forced combustion is necessary (YES in S14), forced combustion of the burner 52 is performed (S15).

  During this forced combustion or after forced combustion, it is determined whether there is a hot water supply request (S16). This hot water supply request is determined by detecting the water amount of the water amount sensor 40-2, for example, by opening a hot water tap. In S12, if it is not the setting in which the hot water heater 8 is incorporated in the FC system 2 (NO in S12), S13, S14 and S15 are skipped and the process proceeds to S16. Further, when the forced combustion is not required in S14 (NO in S14), S15 is skipped and the process proceeds to S16.

  If there is a hot water supply request (YES in S16), the process proceeds to a hot water supply operation (S17). During the hot water supply operation or after the hot water supply operation, if there is no hot water supply request (NO in S16), it is determined whether there is a heating request (S18). This heating request is determined by, for example, ON / OFF of an operation switch of the heating / dissipating device 50.

  If there is a heating request (YES in S18), the process proceeds to a heating operation (S19). If there is no heating request during or after the heating operation (NO in S18), it is determined whether there is a pouring request (S20). This pouring request is determined based on, for example, whether or not there is a pouring request to the bathtub 48.

  If there is a pouring request (YES in S20), the process proceeds to a pouring operation (S21). During this pouring operation or after the pouring operation, if there is no further pouring request (NO in S20), it is determined whether there is a follow-up request (S22). This chasing request is determined based on, for example, whether or not the bath water BW is chased. If there is a tracking request (YES in S22), a tracking operation is performed (S23). During this chasing operation, after the chasing operation, or when there is no chasing request (NO in S22), the process returns to S12, and the processes of S12 to S23 are repeated during startup.

<Gas consumption determination procedure>

  FIG. 5 shows an example of a processing procedure for determining gas consumption. This processing procedure is a subroutine of S13 of the processing procedure shown in FIG. In this processing procedure, it is determined whether or not the burner 52 of the hot water supply and heating device 8 is burning (S31). If combustion is in progress (YES in S31), it is determined whether the measurement time Tb of the combustion time timer 68-2 is greater than a threshold, for example, a predetermined time T2 (S32). That is, if combustion is in progress, it is determined whether the combustion continues for a predetermined time T2 (for example, T2 = 130 [seconds]).

  If Tb> T2 (YES in S32), since combustion continues for a predetermined time T2, the no-combustion timer 68-1 is initialized (measurement time Ta = 0) (S33). It is determined whether this combustion is during forced combustion (S34). If the forced combustion is being performed (YES in S34), the “completion” of the forced combustion mode is stored in the data storage unit 78 (S35), and the process returns to S13 in FIG.

  If Tb> T2 is not satisfied (NO in S32) or if forced combustion is not being performed (NO in S34), the process similarly returns to S13 in FIG.

  If combustion is not in progress at S31 (NO at S31), the combustion time timer 68-2 is initialized (measurement time Tb = 0) (S36). That is, if not burning, the burning time timer 68-2 is maintained in the reset state as the state without burning.

  It is determined whether the measurement time Ta of the non-combustion timer 68-1 is greater than a threshold value, for example, a predetermined time T1 (S37). That is, it is determined by the no-combustion timer 68-1 whether or not there is combustion over a predetermined time T1 (for example, T1 = 10 [hours]).

  If Ta> T1 (YES in S37), the start time of forced combustion (that is, the time to avoid gas shutoff by the gas meter 14) has arrived, so that “start” of the forced combustion mode is stored in the data storage unit 78. Then (S38), the process returns to S13 in FIG.

  If Ta> T1 is not satisfied (NO in S37), the process similarly returns to S13 in FIG.

<Processing procedure for forced combustion>

  FIG. 6 shows a processing procedure for forced combustion. In this processing procedure, when the process proceeds to the forced combustion process, it is determined whether the forced combustion mode = “start” (S41). This forced combustion mode includes a standby period from the start to the transition to forced combustion, an air cooling period in which the heat medium HM is cooled in the standby period, and a period in which forced combustion is executed. If it transfers to this forced combustion mode, the heat-medium circulation path 44 will be constructed | assembled (S42), and the circulation pump 22-2 will be driven (S43). In this case, when the forced combustion mode “start” is stored, circulation combustion is performed only in the heat medium circulation path 44 in the hot water heater / heater 8, so that the heat medium HM is closed by operating a high-temperature distribution valve or the like. A realistic circulation path.

  It is determined whether or not the detected temperature thm of the heating medium HM exiting from the heating medium tank 54 is higher than a predetermined temperature ta (S44). The temperature of the heating medium on the outlet side of the heating medium tank 54 is measured by the temperature sensor 34-5, and it is determined whether the constant temperature ta is higher than, for example, ta = 55 [° C.]. If thm> ta is not satisfied (NO in S44), combustion is started by driving the circulation pump 22-2 (S45). In this case, the combustion of the burner 52 is performed in a combustion pattern with a gas amount that continues combustion for a predetermined time while suppressing boiling of the heat medium HM. In this case, the forced combustion mode = “execute” is stored in the data storage unit 78 of the memory 66 (S46), and the process returns to S15 in FIG.

  In S44, if thm> ta (YES in S44), it is determined whether there is a hot water supply request (S47). If there is no hot water supply request (NO in S47), the air supply fan 62 is driven without driving the circulation pump 22-2 and without causing ignition (S48). By supplying air from the supply fan 62, the heat medium HM is air-cooled to prevent the temperature of the heat medium HM from rising. In this case, when the temperature of the heat medium HM is high, in order to lower the temperature, the air supply fan 62 is driven without performing combustion to cool the heat medium HM.

  If there is a hot water supply request in S47 (YES in S47), the forced combustion mode = “execution” is stored in the data storage unit 78 (S49), and the process returns to S15 in FIG. In this case, when the forced combustion mode = “execution” is stored, the circulation pump 22-2 is driven and combustion is performed with a combustion amount capable of continuous combustion for a predetermined time. The combustion control depends on the hot water supply operation.

  If the forced combustion mode is not “start” in S41 (NO in S41), it is determined whether the forced combustion mode is “execution” (S50). If the forced combustion mode = “execution” (YES in S50), it is determined whether there is a hot water supply request (S51). If there is no hot water supply request (NO in S51), the circulation pump 22-2 is driven and minimum combustion is executed (S52), and the process returns to S15 in FIG.

  If the forced combustion mode is not “execution” in S50 (NO in S50), it is determined whether the forced combustion mode is “finished” (S53). If the forced combustion mode is “end” (YES in S53), the forced combustion mode “standby” is stored in the data storage unit 78 (S54).

  Then, it is determined whether other combustion (hot water supply, heating, reheating, etc.) is being performed (S55). If other combustion is not being performed (NO in S55), the circulation pump 22-2 is stopped, The combustion is stopped (S56).

  If the forced combustion mode is not “end” in S53 (NO in S53), or if another combustion is being performed in S55 (YES in S55), the process returns to S15 in FIG.

<Processing procedure for heating operation>

  FIG. 7 shows a processing procedure of the heating operation. In this processing procedure, it is determined whether the forced combustion mode is “standby” (S61). If the forced combustion mode is not “standby” (NO in S61), heating moderation is set (S62), and S19 in FIG. Return to If the forced combustion mode = “standby” (YES in S61), normal heating is set (S63), and the process returns to S19 in FIG.

<Processing procedure for pouring operation>

  FIG. 8 shows a processing procedure of the pouring operation. In this processing procedure, it is determined whether the forced combustion mode is “standby” (S71). If the forced combustion mode is not “standby” (NO in S71), the heating moderation is poured (S72). Return to S21. If the forced combustion mode = “standby” (YES in S71), normal pouring is performed (S73), and the process returns to S21 in FIG.

<Processing procedure for tracking operation>

  FIG. 9 shows a processing procedure for the chasing operation. In this processing procedure, it is determined whether the forced combustion mode is “standby” (S81). If the forced combustion mode is not “standby” (NO in S81), the heating moderation is followed (S82), and S23 in FIG. Return to If the forced combustion mode = “standby” (YES in S81), normal tracking is performed (S83), and the process returns to S23 in FIG.

<Burner combustion and combustion monitoring>

  FIG. 10 shows an example of burner combustion and combustion monitoring operation.

  As shown in FIG. 10A, the combustion of the burner 52 includes a normal combustion mode A1 and a forced combustion mode A2. The normal combustion mode A1 is combustion during hot water supply, heating, pouring or reheating. On the other hand, forced combustion mode A2 is combustion for avoiding automatic shut-off of the gas meter 14. As an example, the time point t1 is the combustion start time point of the normal combustion mode A1, t2 is the initialization time point of the no-combustion timer 68-1, the time point t3 is the initialization time point of the combustion time timer 68-2, and the time point t4 is the forced combustion mode A2 It is the start time. In this case, time t1 is the measurement start time of the combustion time timer 68-2, and time t3 is the measurement start time of the non-combustion timer 68-1.

  As shown in FIG. 10B, the non-combustion timer 68-1 counts up at the end of combustion t3 in the normal combustion mode A1. When the measurement time Ta reaches Ta> T1, this time point t4 becomes the start timing of forced combustion. As an example, the time T1 is T1 = 10 [hours].

  As shown in FIG. 10C, the combustion time timer 68-2 counts up with the combustion start time t1 of the normal combustion mode A1. The measurement time Tb reaches Tb = T2, and this time point t2 is the end timing of the time for avoiding the automatic shutoff of the gas meter 14. The time T2 is 130 [seconds] as an example.

<Operation and Effect of One Embodiment>

  According to the embodiment described above, the following operations and effects can be obtained.

  (1) The automatic shut-off of the gas meter 14 due to the gas consumption (combustion) mode of the FC system 2 can be avoided, and the restart of the FC system 2 accompanying the automatic shut-off of the gas meter 14 can be avoided.

  (2) Avoiding automatic shutoff of the gas meter 14 when no gas leak occurs, forced combustion of the burner 52 by the heat medium circulation of the heat medium circulation path 44 inside the hot water heater 8, that is, boiling of the heat medium HM. This can be achieved by continuous combustion while suppressing.

  (3) Since the hot water heater / heater 8 is provided with a setting / determination function indicating whether the hot water heater / heater 8 is incorporated in the FC system 2, based on the setting / judgment, the normal operation of the gas meter 14 in accordance with the predetermined conditions. Automatic shut-off can be avoided. This can be realized by default settings when the hot water supply / heating device 8 and the FC system 2 are installed without requiring a special setting operation by the user. The hot water heater / heater 8 can be easily configured to be configured to incorporate the FC system 2 at the time of manufacture.

  (4) For the diversifying FC system 2 such as installation space, the tank unit 6 provided as an auxiliary heat source and the hot water heater 8 as an example of the heat source machine can be separately installed, and the function of the existing hot water heater It can contribute to the spread and high functionality of the FC system 2.

  (5) The installation cost of the FC system 2 can be reduced by using the hot water supply and heating device 8 of the above embodiment as compared with the case where the auxiliary heat source is a dedicated device attached to the FC system 2.

  (6) If the SOFC type with a high operating temperature is used for the fuel cell 18, it takes time to start and stop, and automatic shutoff of the gas meter 14 can be avoided. Therefore, starting and stopping in the middle using the SOFC type can be avoided. In addition, constant power generation can be performed continuously for a long time.

  (7) The forced combustion operation uses the heat medium circulation of the existing heat medium circulation path 44 inside the equipment, so that no special equipment is required, and the manufacturing cost can be reduced and the apparatus can be reduced in weight.

<Modification of combustion determination>

  In one embodiment, the combustion determination is made based on whether or not the burner 52 burns. However, this combustion determination may be made based on an external signal. FIG. 11 shows a processing procedure for determining gas consumption using an external signal. This processing procedure is a subroutine of S13 of the processing procedure shown in FIG. In this processing procedure, it is determined whether or not the burner 52 of the hot water supply and heating device 8 is burning (S91). If combustion is in progress (YES in S91), it is determined whether the measurement time Tb of the combustion time timer 68-2 is greater than a threshold, for example, a predetermined time T2 (S92). That is, if combustion is in progress, it is determined whether the combustion continues for a predetermined time T2 (for example, T2 = 130 [seconds]).

  If Tb> T2 (YES in S92), it is determined whether forced combustion is being performed (S93). If the forced combustion is being performed (YES in S93), the “completion” of the forced combustion mode is stored in the data storage unit 78 (S94), and the process returns to S13 in FIG.

  If Tb> T2 is not satisfied (NO in S92), or if forced combustion is not being performed (NO in S93), the process similarly returns to S13 in FIG.

  If combustion is not in progress in S91 (NO in S91), the measurement time Tb of the combustion time timer 68-2 is initialized (S95). That is, if not burning, the burning time timer 68-2 is maintained in the reset state as the state without burning.

  Then, it is determined whether there is a request signal for forced combustion (S96). That is, it is determined whether a forced combustion request is generated from the outside via a remote control signal or the like. In this case, it is detected that a state in which there is no change in the gas consumption outside continues for a predetermined time, for example, 10 hours.

  If there is a request signal for forced combustion (YES in S96), the forced combustion start time (that is, the time for avoiding gas shutoff by the gas meter 14) has arrived, so the start of the forced combustion mode is stored in the data storage unit 78. Then, the process returns to S13 in FIG.

  If there is no forced combustion request signal (NO in S96), the process similarly returns to S13 in FIG.

  In the process of FIG. 4, the heat source machine starts forced combustion by its own time management, but starts forced combustion by an instruction signal from the outside of the heat source machine (tank unit control unit 26-2 in FIG. 1) via the remote control line. You may make it do.

<Modified example of burner combustion and combustion monitoring>

  FIG. 12 shows a modification of the burner combustion and the combustion monitoring operation. In the operation of FIG. 10, the timing form for counting up is illustrated, but a countdown form may be used, and FIG. 12 shows a form of countdown.

<Modification of heat source machine>

  Although the hot water supply and heating device 8 is illustrated as an example of the heat source machine, other hot water supply devices and a dedicated heating device may be used instead of the hot water supply and heating device 8.

  FIG. 13 shows an example of the hot water supply device 82. In FIG. 13, the same parts as those in FIG. 1 or FIG. In this hot water supply device 82, two sets of burners 52-1 and 52-2 and air supply fans 62-1 and 62-2 are installed in the combustion chamber 60. The burner 52-1 and the air supply fan 62-1 are used for heating the hot water HW that circulates in the water supply path. On the other hand, the burner 52-2 and the air supply fan 62-2 are used for heating the heat medium HM circulating in the heat medium circulation path 44. In this case, a heat exchanger 20-7 for exchanging sensible heat of the combustion heat of the burner 52-1 with warm water is installed on the water supply path 42 side. In this case, heat of the heat medium HM is exchanged with the bath water BW flowing in the memory circulation path 46 by the heat exchanger 20-4.

  By forcibly circulating the heating medium HM in the heating medium circulation path 44 in such a two-can three-water type hot water supply apparatus 82, the fuel gas G is forcibly burned by the burner 52-2, and the gas meter 14 in a normal state is obtained. May be prevented from being automatically shut off.

  FIG. 14 shows an example of the heating only device 84. In FIG. 14, the same parts as those in FIG. 1 or FIG. In this case, the combustion chamber 60 is provided with a heat exchanger 20-3 for exchanging the combustion heat of the burner 52 to the heat medium HM. The above-described heating and radiating device 50 is connected to the branch pipes 59-1, 59-2, 59-3 of the heat medium circulation path 44.

  By forcibly circulating the heating medium HM in the heating medium circulation path 44 in such a dedicated heating device 84, the fuel gas G is forcibly burned by the burner 52, and automatic shut-off of the gas meter 14 at normal time is prevented. Also good.

[Other Embodiments]

  (1) In the above embodiment, the consumption information of the fuel gas G is notified from the tank unit control unit 26-2 to the hot water supply / heating control unit 26-3, but from the FC control unit 26-1 to the hot water supply / heating control unit 26. -3 may be received, and the forced combustion of the burner 52 may be performed in response to this control information.

  (2) Although the FC unit 4 of the FC system 2 is illustrated as an example of the external device of the fuel gas G, the heat source device of the present invention is not limited to the FC system 2. If it is an external device that continuously causes gas consumption and causes automatic shutoff of the gas meter 14, the automatic shutoff of the microcomputer meter at the normal time can be avoided by using the heat source device of the present invention.

  (3) In the above embodiment, the FC unit 4 is used. However, a device that converts fuel gas such as a gas engine into other energy may be used.

As described above, the most preferable embodiment of the technology of the present invention has been described. The present invention is not limited to the above description. Various modifications and changes can be made by those skilled in the art based on the gist of the invention described in the claims or disclosed in the embodiments for carrying out the invention. It goes without saying that such modifications and changes are included in the scope of the present invention.

According to the present invention, in the heat source device, the heat source control program, and the fuel cell cogeneration system, it is possible to prevent malfunction of the automatic shut-off function of the gas meter due to continuous use when no gas leakage occurs. Driving can be maintained.

2 Fuel cell cogeneration system (FC system)
4 FC unit 6 Tank unit 8 Water heater / heater 10 Remote control device 10-1 Bathroom remote control 10-2 Kitchen remote control 12 Fuel supply path 14 Gas meter 16 Reformer 18 Fuel cell 20-1, 20-2, 20-3, 20 -4 Heat exchanger 22-1, 22-2 Circulation pump 24 Heat medium circulation path 24-1 First path 24-2 Second path 24-3 Third path 26-1 FC controller 26-2 Tank Unit control unit 26-3 Hot water supply / heating control unit 28-1, 28-2 Communication line 30 Hot water storage tank 32-1 Exhaust heat switching valve 32-2 Pressure reducing valve 32-3 Mixing valve 32-4 Water control valve 34-1 Temperature sensor 36 Water supply path 38 Hot water supply path 40-1 Water quantity sensor 42 Water supply path 44 Heat medium circulation path 46 Remembrance circulation path 48 Bathtub 50 Heating / radiating equipment 50-1 Low temperature terminal 50-2 High temperature terminal 52 Burner 54 Heat medium tank 56 Water supply port 58 Hot water outlet 59-1, 59-2, 59-3 Branch pipe 60 Combustion chamber 62 Air supply fan 63 Control system 64 Processor 66 Memory 68-1 No combustion timer 68-2 Combustion time timer 70 Input / output section (I / O)
72 Communication Interface 74 Bus 76 Program Storage Unit 78 Data Storage Unit 80 RAM
82 Hot water supply equipment 84 Heating equipment

Claims (11)

A heat source device that is connected to a separately installed tank unit, burns fuel gas, and heats water supplied from the tank unit to supply hot water,
A burner for combusting the fuel gas,
An in-device circuit that is set in the device to circulate the heat medium; and
A first heat exchanger for exchanging heat of combustion of the burner to the heat medium;
A second heat exchanger for exchanging heat of the heat medium with water supplied from the tank unit ;
First timing means for measuring the unburned time of the burner;
If the unburned time measured of the first timing means exceeds a first predetermined time, said combustion of the burner is started, while suppressing the boiling of the heating medium circulating in the device in the circulation path the When the combustion of the burner shifts to forced combustion that continues for a second set time, and water is supplied from the tank unit during the forced combustion, the combustion shifts from forced combustion to hot water supply operation, and the heat is transferred by the second heat exchanger. A control unit for exchanging heat of the medium with water supplied from the tank unit;
Heat source apparatus comprising: a. Furthermore, a heating medium path that includes a circulation pump, includes the in-device circulation path, and circulates the heating medium in the first heat exchanger;
A control unit that forcibly burns the burner according to an operation state of an external device that consumes the fuel gas supplied from a downstream side of a gas meter having a gas cutoff function or based on consumption information of the fuel gas from the external device When,
The heat source device according to claim 1, comprising: A second timer means for measuring a combustion time before Symbol burner,
When the burning time exceeds a third set time, and a control unit for resetting the counted time of the first time counting means,
The heat source device according to claim 1, comprising: With an air supply fan,
A temperature sensor for detecting the temperature of the heat medium;
The control unit operates the air supply fan until the heat medium temperature falls to the predetermined temperature when the heat medium temperature exceeds the predetermined temperature. The heat source device described in 1. The control unit, during forced combustion of the burner, when a standby operation for shifting to the forced combustion or a heating operation using the heat source device as a heat source during a cooling operation of the heating medium, a hot water supply operation, or a bathtub reheating operation occurs, these heating operation, the hot water supply operation or bath additionally焚動operation, the forced combustion, heat source apparatus according to any one of claims 2 to claim 4, characterized in that priority is given to the waiting and the cooling operation . A heat source control program to be executed by a computer ,
Measure the unburned time of the burner installed in the heat source device to burn the fuel gas ,
Monitoring the water supply to the heat source device from a tank unit installed separately from the heat source device;
When the unburned time exceeding the first set time is measured, combustion of the burner is started while suppressing the boiling of the heat medium circulating in the heat medium path in the heat source device by starting combustion of the burner. was allowed to migrate to the forced combustion to continue the second set time, heat exchange combustion heat of the burner to the heat medium circulating in the heat medium path,
When water supply from the tank unit is detected during the forced combustion, the heat source control is performed to cause the computer to perform a process of transferring heat from the forced heating to the water supply from the tank unit by shifting from forced combustion to hot water supply operation. program. Monitoring the operating status of an external device that consumes fuel gas supplied from the downstream side of a gas meter having a gas automatic shut-off function, or receiving consumption information of the fuel gas from the external device;
Forcibly burning the burner;
Heat exchange of the combustion heat of the burner to a heat medium circulating in the heat medium path
The heat source control program according to claim 6, which causes the computer to execute processing. Measure the heat medium temperature of the heat medium,
When the heat medium temperature exceeds a predetermined temperature, the air supply fan is operated until the heat medium temperature falls to the predetermined temperature,
The heat source control program according to claim 6 or 7, for causing the computer to execute a process of cooling the heat medium circulating in the heat medium path. When a heating operation, a hot water supply operation, or a bathtub reheating operation using the combustion heat of the burner as a heat source occurs during the forced combustion of the burner, during standby to shift to the forced combustion or during the cooling operation of the heating medium, these heating operations The method according to any one of claims 6 to 8 , for causing the computer to execute a process of preferentially executing a hot water supply operation or a bath tub chasing operation with respect to the forced combustion, the standby, and the cooling operation. The described heat source control program. A power generation unit that generates power using fuel gas supplied from a downstream side of a gas meter having a gas automatic shut-off function;
Heat storage means for collecting and storing the exhaust heat of the power generation unit;
When the unburned time of the burner that burns the fuel gas exceeds a first set time, the burner starts burning and circulates in the heat medium path . The combustion of the burner is shifted to forced combustion that continues for a second set time while suppressing boiling of the heat medium, and the combustion heat of the burner is exchanged with the heat medium, and water is supplied from the heat storage means during the forced combustion. When receiving, a heat source device including a control unit that shifts from forced combustion to hot water supply operation and heat exchanges heat of the heat medium to water supply from the heat storage unit ,
A fuel cell cogeneration system comprising:   The fuel cell cogeneration system according to claim 10, wherein the heat source device is the heat source device according to claim 1.

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