JP5991816B2 - Combined heat and power system - Google Patents

Description

  The present invention provides a power generation device having an engine, a generator driven by the engine, and a power generation operation control unit that controls the operation of the engine and the generator, and heats the user by operating by consuming electric power. The power consumption type heat utilization device that can be used, the heat recovery operation for recovering exhaust heat from the engine, and the heat that supplies the recovered heat to the power consumption type heat utilization device to operate the power consumption type heat utilization device The present invention relates to a combined heat and power system including an exhaust heat recovery device having an exhaust heat recovery control unit that controls a supply operation.

  There is a combined heat and power system that includes an engine and a generator that function as a heat source and a power source. For example, a combined heat and power system includes a power generation device having an engine and a generator, a heat recovery operation for recovering exhaust heat from the engine, and heat supply for supplying the recovered heat to the heat utilization device and operating the heat utilization device. An exhaust heat recovery device for operation is provided. In such a combined heat and power system, operation control of the power generator (engine and generator) is performed so that heat and power can be used efficiently. For example, in the combined heat and power system described in Patent Literature 1, a predicted heat load and a predicted power load are derived based on the past heat load and power load, and a power generator suitable for covering the predicted heat load and predicted power load is provided. An operation plan (operation start timing, operation stop timing, etc.) is created. Moreover, even if the generated power of the power generation device is insufficient with respect to the power load, it is configured so that it can be purchased from an external power system.

JP 2002-213303 A

In the conventional combined heat and power system as described in Patent Document 1, since it is assumed that insufficient power can be purchased from an external power system, an operation plan for shutting down the power generator is also allowed. However, when the external power system fails, there is a problem that power cannot be continuously supplied to the power consuming device if the power generation device is stopped according to the operation plan.
Therefore, if the conventional combined heat and power system is operated during a power outage of the external power system, the power generation device can stand on its own without obeying it even if it is commanded to shut down in view of the previously planned operation plan. It is assumed that it must be modified to continue operation.

Note that, in a combined heat and power system in which the exhaust heat recovery device is configured to recover exhaust heat from the power generation device, recovering the exhaust heat from the power generation device means cooling the power generation device. For this reason, if the exhaust heat recovery apparatus has trouble in recovering exhaust heat from the power generation apparatus, the power generation apparatus may not be normally cooled.
In particular, since the power generator performs a self-sustained operation at the time of a power failure of the external power system and continuously supplies power to the power consuming apparatus, even if it is instructed to stop the operation in view of the previously planned operation plan, If it is configured so as not to comply, the power generation apparatus is in response to a problem in the exhaust heat recovery from the power generation apparatus in the exhaust heat recovery apparatus (that is, the situation where heat generation is not required). On the other hand, even if the operation stop is instructed, the operation stop is not accepted by the power generation device, and as a result, the power generation device cannot be cooled normally, and the power generation device may fail.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to generate power failure without interrupting power supply by continuously operating the power generator during a power failure of the external power system. Is to provide a cogeneration system that can be avoided.

In order to achieve the above object, a characteristic configuration of a combined heat and power system according to the present invention includes an engine, a generator driven by the engine, and a power generation operation control unit that controls the operation of the engine and the generator. And a power consumption type heat utilization device that makes it possible for a user to use heat by operating by consuming electric power, a heat recovery operation for recovering exhaust heat from the engine, and the recovered heat for power consumption. A combined heat and power system comprising an exhaust heat recovery device having an exhaust heat recovery control unit for controlling a heat supply operation for operating the power consumption type heat utilization device by supplying to the mold heat utilization device,
The exhaust heat recovery device and the power consuming heat utilization device are generated by the electric power supplied from the external electric power system and the electric generator during the interconnection operation in which the electric generator is connected to the external electric power system. So that at least one of the generated electric power can be received, and the electric power generated by the generator can be received during the self-sustaining operation in which the generator is not connected to the external power system. Composed of
The exhaust heat recovery device stores hot water, a hot water storage device to which clean water is supplied from a water supply path so as to keep the pressure of the stored hot water at a set pressure value or more, and the hot water storage device and the engine cooling of the engine An exhaust heat recovery path through which hot water flows between heat exchangers to which water heat is transferred, an exhaust heat recovery pump that adjusts the flow rate of hot water in the exhaust heat recovery path, an abnormality in the heat recovery operation, or the heat supply An abnormality detection means capable of detecting an abnormality in operation,
The power generation operation control unit performs the operation control to continuously operate the generator and the generator without stopping during the independent operation in which the generator is not connected to the external power system, and the exhaust heat recovery is performed. In response to an emergency stop command given to the power generator by the control unit, the engine and the generator operate in a self-sustaining operation mode that stops operation ,
The abnormality detection means has a pressure sensor capable of detecting the pressure of hot water stored in the hot water storage device, and determines that an abnormality has occurred when the pressure detected by the pressure sensor becomes less than the set pressure value,
The exhaust heat recovery control unit is in the point of giving the emergency stop command to the power generation device when the abnormality detection means detects an abnormality .

According to the above characteristic configuration, even when a power failure occurs in the external power system, power is supplied to the inside of the combined heat and power system by operating the generator independently without connecting to the external power system. be able to. In particular, in this feature configuration, the power generation operation control unit performs operation control for continuous operation without stopping the engine and the generator during the self-sustaining operation in which the generator is not linked to the external power system. It is possible to continue using desired electrical equipment during a power outage.
Further, since the exhaust heat recovery device can receive supply of electric power generated by the generator during the independent operation of the generator, it can recover exhaust heat from the engine, that is, cool the engine. Furthermore, since the power consumption type heat utilization device can also receive the supply of electric power generated by the generator during the independent operation of the generator, the operation using the heat stored in the exhaust heat recovery device can be continued. That is, it is possible to avoid a situation where the heat stored in the exhaust heat recovery device is full and exhaust heat cannot be recovered from the engine, that is, the engine cannot be cooled well.
Furthermore, the power generation operation control unit, since the control for stopping the operation of the engine and the generator in response to an emergency stop command the exhaust heat recovery control unit based on the status of the exhaust heat recovery apparatus is given to the power generator, usually When it is determined that the exhaust heat recovery control unit needs to stop urgently while performing continuous operation without stopping the engine and generator without interrupting the power supply to the inside of the combined heat and power system Therefore, it is possible to avoid a failure that may occur when the emergency stop is accepted and the operation of the combined heat and power system is continued.
Therefore, it is possible to provide a combined heat and power system that can avoid the occurrence of a failure while continuously supplying power by continuously operating the power generator during a power failure of the external power system.
In addition, if there is an abnormality in the heat recovery operation, there may be a problem that the engine cannot be cooled well. Further, if there is an abnormality in the heat supply operation, there may be a problem that heat cannot be discharged well from the exhaust heat recovery device to the power consuming heat utilization device.
However, according to this feature configuration, the abnormality detection means detects an abnormality in the heat recovery operation or an abnormality in the heat supply operation, and the exhaust heat recovery control unit gives an emergency stop command to the power generator, so that the engine is improved. Occurrence of the problem that cooling cannot be performed and the problem that heat cannot be discharged well from the exhaust heat recovery apparatus to the power consuming heat utilization apparatus can be avoided. In particular, the abnormality detection means of this feature configuration has a pressure sensor capable of detecting the pressure of hot water stored in the hot water storage device, and an abnormality has occurred when the pressure detected by the pressure sensor is less than the set pressure value. Is determined. As a result, the exhaust heat recovery control unit issues an emergency stop command to the power generator when an abnormality occurs that causes the pressure of the hot water stored in the hot water storage device detected by the pressure sensor to be less than the set pressure value due to water interruption or the like. By providing, it is possible to avoid the problem that the engine cannot be cooled well and the problem that heat cannot be discharged well from the exhaust heat recovery device to the power consuming heat utilization device.

Still another characteristic configuration of the combined heat and power system according to the present invention includes an engine, a generator driven by the engine, a power generation operation control unit that controls the operation of the engine and the generator, and power Power consumption type heat utilization device that makes it possible for a user to use heat by consuming and operating, heat recovery operation for recovering exhaust heat from the engine, and the recovered heat for the power consumption type heat utilization device A combined heat and power system comprising an exhaust heat recovery device having an exhaust heat recovery control unit for controlling a heat supply operation for operating the power consumption type heat utilization device to supply
The exhaust heat recovery device and the power consuming heat utilization device are generated by the electric power supplied from the external electric power system and the electric generator during the interconnection operation in which the electric generator is connected to the external electric power system. So that at least one of the generated electric power can be received, and the electric power generated by the generator can be received during the self-sustaining operation in which the generator is not connected to the external power system. Composed of
  The exhaust heat recovery device stores hot water, a hot water storage device to which clean water is supplied from a water supply path so as to keep the pressure of the stored hot water at a set pressure value or more, and the hot water storage device and the engine cooling of the engine An exhaust heat recovery path through which hot water flows between heat exchangers to which water heat is transferred, an exhaust heat recovery pump that adjusts the flow rate of hot water in the exhaust heat recovery path, an abnormality in the heat recovery operation, or the heat supply An abnormality detection means capable of detecting an abnormality in operation,
The power generation operation control unit performs the operation control to continuously operate the generator and the generator without stopping during the independent operation in which the generator is not connected to the external power system, and the exhaust heat recovery is performed. In response to an emergency stop command given to the power generator by the control unit, the engine and the generator operate in a self-sustaining operation mode that stops operation,
  The abnormality detecting means includes a flow rate sensor capable of detecting a flow rate that is the amount of hot water flowing in the exhaust heat recovery path per unit time, and an abnormality occurs when the flow rate of hot water detected by the flow rate sensor is less than a set lower limit flow rate. Is determined to have occurred,
  The exhaust heat recovery control unit is in the point of giving the emergency stop command to the power generation device when the abnormality detection means detects an abnormality.

According to the above characteristic configuration, even when a power failure occurs in the external power system, power is supplied to the inside of the combined heat and power system by operating the generator independently without connecting to the external power system. be able to. In particular, in this feature configuration, the power generation operation control unit performs operation control for continuous operation without stopping the engine and the generator during the self-sustaining operation in which the generator is not linked to the external power system. It is possible to continue using desired electrical equipment during a power outage.
  Further, since the exhaust heat recovery device can receive supply of electric power generated by the generator during the independent operation of the generator, it can recover exhaust heat from the engine, that is, cool the engine. Furthermore, since the power consumption type heat utilization device can also receive the supply of electric power generated by the generator during the independent operation of the generator, the operation using the heat stored in the exhaust heat recovery device can be continued. That is, it is possible to avoid a situation where the heat stored in the exhaust heat recovery device is full and exhaust heat cannot be recovered from the engine, that is, the engine cannot be cooled well.
  Further, the power generation operation control unit performs control to stop the operation of the engine and the generator according to the emergency stop command given to the power generation device by the exhaust heat recovery control unit based on the state of the exhaust heat recovery device. When it is determined that the exhaust heat recovery control unit needs to stop urgently while performing continuous operation without stopping the engine and generator without interrupting the power supply to the inside of the combined heat and power system Therefore, it is possible to avoid a failure that may occur when the emergency stop is accepted and the operation of the combined heat and power system is continued.
  Therefore, it is possible to provide a combined heat and power system that can avoid the occurrence of a failure while continuously supplying power by continuously operating the power generator during a power failure of the external power system.
  In addition, if there is an abnormality in the heat recovery operation, there may be a problem that the engine cannot be cooled well. Further, if there is an abnormality in the heat supply operation, there may be a problem that heat cannot be discharged well from the exhaust heat recovery device to the power consuming heat utilization device.
  However, according to this feature configuration, the abnormality detection means detects an abnormality in the heat recovery operation or an abnormality in the heat supply operation, and the exhaust heat recovery control unit gives an emergency stop command to the power generator, so that the engine is improved. Occurrence of the problem that cooling cannot be performed and the problem that heat cannot be discharged well from the exhaust heat recovery apparatus to the power consuming heat utilization apparatus can be avoided. In particular, the abnormality detection means of this feature configuration has a flow rate sensor capable of detecting a flow rate that is the amount of hot water flowing in the exhaust heat recovery path per unit time, and the flow rate of the hot water detected by the flow rate sensor is the set lower limit flow rate. If it is less than that, it is determined that an abnormality has occurred. As a result, if the exhaust heat recovery control unit has an abnormality where the flow rate of hot water detected by the flow sensor is less than the set lower limit flow rate due to malfunction of the exhaust heat recovery pump or water leakage or blockage in the exhaust heat recovery path, By giving an emergency stop command to the power generation device, problems such as the problem that the engine cannot be cooled well and the problem that heat cannot be discharged from the exhaust heat recovery device to the power-consuming heat utilization device can be avoided. it can.

  Yet another characteristic configuration of the combined heat and power system according to the present invention is that the power generation operation control unit is connected to the external power system in an interconnected operation separately from the operation in the independent operation mode. When the exhaust heat recovery control unit performs operation control of the engine and the generator according to an operation control command including an operation start command and an operation stop command given to the power generation device according to a predetermined operation plan The point is to operate in the operation mode.

  According to the above characteristic configuration, the power generation operation control unit operates in the self-sustained operation mode in which the generator and the generator are continuously operated without being stopped during the interconnection operation in which the generator is connected to the external power system. Separately, the engine and the generator are controlled in accordance with an operation control command including an operation start command and an operation stop command given to the power generator by the exhaust heat recovery control unit according to a predetermined operation plan. In other words, if the external power system is not out of power and the generator is linked to the external power system, the combined heat and power system will receive power from the external power system even if the generator is shut down. Can be supplied. As a result, continuous operation of the engine and generator is not forced so as not to interrupt power supply to the combined heat and power system, so the engine and generator are stopped and started according to the operation plan as appropriate. it can.

  Still another characteristic configuration of the combined heat and power system according to the present invention is that the exhaust heat recovery control unit determines whether the power generation operation control unit is operating in the interconnection operation mode or the independent operation mode. It is in the point of transmission.

According to the above characteristic configuration, the exhaust heat recovery control unit can know whether the power generation operation control unit is operating in the interconnection operation mode or the independent operation mode. As a result, the exhaust heat recovery control unit can perform operation control of the exhaust heat recovery device according to whether the power generation operation control unit is operating in the grid operation mode or the independent operation mode.

Still another characteristic configuration of the combined heat and power system according to the present invention is that the power that operates by receiving the supply of the power generated by the generator during the self-sustaining operation in which the generator is not connected to the external power system. With a consumption device,
The power generation operation control unit is configured such that the generator generates power from the exhaust heat recovery device, the power consumption device, and the power consumption type heat utilization device during a self-sustained operation in which the generator is not linked to the external power system. The operation control is to continuously generate the electric power corresponding to the load.

  According to the above characteristic configuration, the power generation operation control unit supplies the power load of the exhaust heat recovery device, the power consuming device, and the power consuming heat utilization device, that is, the power corresponding to the required power load, to the self-sustaining power generator. It can be supplied continuously during operation.

The figure explaining the composition of the equipment provided with the combined heat and power system Flow chart explaining operation of power generation device and exhaust heat recovery device

Hereinafter, a combined heat and power system will be described with reference to the drawings. FIG. 1 is a diagram illustrating the configuration of equipment provided with a combined heat and power system. The combined heat and power system can supply power and heat to the power consuming device 14 and the heat utilization device 13 installed in the house 10. Specifically, the combined heat and power system includes a power generator 20 having an engine 21, a generator 22 driven by the engine 21, a power generation operation control unit 29 that controls the operation of the engine 21 and the generator 22, and power Consumption type heat utilization device E that makes it possible for a user to use heat by operating and heat recovery operation for recovering exhaust heat from the engine 21, and power consumption type for recovering heat recovered from the engine 21 An exhaust heat recovery apparatus 40 having an exhaust heat recovery control unit 45 that controls a heat supply operation for supplying the heat use apparatus E and operating the power consuming heat utilization apparatus E is provided.
In the following, the configuration of the equipment provided with the combined heat and power system will be described with reference to FIG. 1, and the contents of the control performed in the combined heat and power system will be described with reference to FIG. 2.

[House 10]
In the house 10, a distribution board 11, a power consuming device 14, and a heat utilization device 13 to which power is supplied from the external power system 1 are installed. When power is normally supplied from the external power system 1, power is supplied to the power consuming device 14 via the distribution board 11. Moreover, the generator 22 of the power generator 20 can be connected to the distribution board 11 as will be described later. When power is normally supplied from the external power system 1, the power generated by the generator 22 is supplied to the distribution board 11. That is, the interconnection operation in which the generator 22 is linked to the external power system 1 is performed. A power consuming device 14A, an indoor electrical outlet 15, and an outdoor electrical outlet 4 are electrically connected to the distribution board 11. Various electric power consumption devices 14 installed in the house 10 can be connected to the indoor electrical outlet 15. In the example illustrated in FIG. 1, the power consuming device 14 </ b> B is illustrated as the power consuming device 14 that can be connected to the indoor electrical outlet 15. The power consuming device 14 </ b> B is electrically connected to the electrical plug 7, and can be supplied with power via the distribution board 11 by attaching the electrical plug 7 to the indoor electrical outlet 15.

  In the present embodiment, the power consuming device 14A is a device that may interrupt the power supply when the power supply via the distribution board 11 is interrupted (that is, when the external power system 1 fails). For example, some lighting devices). The power consuming device 14B is a device (for example, a refrigerator or some lighting devices) that requires power supply even when power supply via the distribution board 11 is interrupted. Note that the user can appropriately change which device is classified as the power consuming device 14A or the power consuming device 14B.

  In the present embodiment, the heat utilization device 13 includes a bathroom heating / drying device 13A, a floor heating device 13B, and a hot water supply device 13C. As will be described later, these devices use the heat supplied from the exhaust heat recovery device 40 to exhibit a bathroom heating drying function, a floor heating function, and a hot water supply function. Moreover, the bathroom heating / drying apparatus 13A requires electric power to operate an electric device such as a fan for supplying air. In the present embodiment, such a bathroom heating / drying apparatus 13A is an electric power consumption type heat utilization apparatus E that enables the user to use heat by operating while consuming electric power.

  The house 10 is provided with an information output device 16. The information output device 16 includes an information output unit 16A that outputs information, and an output control unit 16B that determines the content of information output by the information output unit 16A and outputs the content from the information output unit 16A. Further, using the operation input unit 16C included in the information output device 16, an instruction (for example, an operation start instruction / operation stop instruction) regarding the operation of the power generation apparatus 20 and the heat utilization apparatus 13 can be performed. The information output means 16A can be constituted by, for example, a display unit capable of outputting information characters or a speaker capable of outputting information sounds. Then, the output control means 16B can output various information handled by the information output device 16 on the display unit serving as the information output means 16A, or output the sound using a speaker serving as the information output means 16A.

In addition, the output control means 16B can output the received power and power consumption in the house 10, the generated power of the power generation apparatus 20, and the like using the information output means 16A.
For example, the received power detection means Wa and the generated power detection means Wb1 and Wb2 can be realized using a current sensor and a voltage sensor. Then, the current value and the voltage value detected by the current sensor and the voltage sensor are transmitted to the power generation operation control unit 29, so that the power generation operation control unit 29 can derive each of the received power and the generated power. In the present embodiment, the received power detection means Wa performs detection on the upstream side of the distribution board 11 (external power system 1 side), and the detection result is transmitted to the power generation operation control unit 29 of the power generator 20 via a communication line. 9 is transmitted. Power generation based on the value of the received power acquired by the power generation operation control unit 29 based on the detection result of the received power detection means Wa and the detection results of the generated power detection means Wb1 (Wb) and the generated power detection means Wb2 (Wb) The value of the generated power acquired by the operation control unit 29 is transmitted to the exhaust heat recovery control unit 45 of the exhaust heat recovery device 40 via the communication line 3. Then, the value of the received power detected by the received power detection means Wa, the generated power detection means Wb1 (Wb), and the generated power detection means Wb2 from the exhaust heat recovery control unit 45 to the output control means 16B of the information output device 16. The value of the generated power detected by (Wb) is transmitted via the communication line 8, and the output control means 16B causes the information output means 16A to output information such as received power, generated power, and consumed power. Alternatively, the exhaust heat recovery control unit 45 may directly instruct the information output unit 16A to output the information.

[Power generation device 20]
The power generation device 20 includes an engine 21, a generator 22 driven by the engine 21, and a power generation operation control unit 29 that controls the operation of the engine 21 and the generator 22. The engine 21 is provided with a manually operated starter device 23. When starting up the power generator 20 at the time of a system power failure, the mode changeover switch for switching which operation mode the user allows the power generator 20 to operate in the grid operation mode or the independent operation mode (see FIG. The engine 21 and the generator 22 are started by operating the starter device 23 manually after switching the power generation device 20 to the self-sustaining operation mode by operating (not shown). In the state where the mode changeover switch is switched to the interconnection operation mode, the power generation device 20 is not started by the starter device 23, and the operation control command (operation start command, operation stop command, etc.) from the exhaust heat recovery control unit 45 is used. ) The generator 22 is provided with two output terminals for outputting generated power. One is a connection output terminal 27 used when supplying power generation output to the distribution board 11 of the house 10 during operation in the connection operation mode, and the other is power generation during operation in the self-sustaining operation mode. This is a self-supporting output end 28 used when supplying output to the indoor electrical outlet 12. In the present embodiment, the output terminal 28 for self-supporting is connected to the indoor electrical outlet 12 inside the house 10 and the outdoor electrical outlet 5 outside the house 10.

  The engine 21 is configured to be cooled by engine cooling water. In the present embodiment, the engine cooling water circulates through the engine 21 and the heat exchanger 24 in order through the cooling water circulation path 25. A cooling water pump 26 is provided in the middle of the cooling water circulation path 25, and the flow rate of the engine cooling water in the cooling water circulation path 25 is adjusted according to the operation of the cooling water pump 26. In the heat exchanger 24, heat is transferred from the engine cooling water to the hot water by exchanging heat between hot water and engine cooling water, which will be described later.

[Exhaust heat recovery device 40]
The exhaust heat recovery device 40 is a heat recovery operation for recovering exhaust heat from the engine 21 and heat for operating the power consumption heat utilization device E by supplying the heat recovered from the engine 21 to the power consumption heat utilization device E. An exhaust heat recovery control unit 45 that controls the supply operation is provided. In the present embodiment, the exhaust heat recovery device 40 includes a hot water storage device 41 as a heat storage device that recovers and stores the exhaust heat from the engine 21. The hot water storage device 41 stores hot water, which is heated by the heat exchanger 24 through the exhaust heat recovery path 42 and returns to the hot water storage device 41 again. An exhaust heat recovery pump 43 is provided in the middle of the exhaust heat recovery path 42, and the flow rate of hot water in the exhaust heat recovery path 42 is adjusted according to the operation of the exhaust heat recovery pump 43.

In both cases where the power generation device 20 is operated in an interconnected manner and when it is operated independently, the engine 21 of the power generation device 20 is cooled, that is, the exhaust heat of the engine 21 is recovered by the exhaust heat recovery device 40. is necessary. Therefore, the exhaust heat recovery control unit 45 performs the heat recovery operation for recovering the exhaust heat from the engine 21 both during the interconnection operation of the power generation apparatus 20 and during the independent operation. Do.
Further, if heat is stored in the hot water storage device 41, the exhaust heat recovery control unit 45 can supply the heat stored in the hot water storage device 41 to the heat utilization device 13 to operate the heat utilization device 13. it can. 1 shows a configuration example in which exhaust heat from the engine 21 is recovered and temporarily stored in the hot water storage device 41, and the heat stored in the hot water storage device 41 is supplied to the heat utilization device 13. However, piping, valves, heat exchangers, and the like may be configured so that the heat recovered from the engine 21 can be supplied to the heat utilization device 13 without passing through the hot water storage device 41. Specifically, the exhaust heat recovery control unit 45 operates such that hot water heated by the heat recovered from the engine 21 flows into the hot water storage device 41, and hot water heated by the heat recovered from the engine 21. May be configured such that a pipe, a valve, a heat exchanger, and the like can be selectively switched from the operation mode in which the heat is supplied to the heat utilization device 13 without flowing into the hot water storage device 41.

  The hot water storage device 41 is configured such that a relatively high temperature hot water is stored in an upper portion thereof, a relatively low temperature hot water is stored in a lower portion thereof, and temperature stratification is formed inside the hot water storage device 41. . The temperature of the hot water in the upper part of the hot water storage device 41 can be detected by the temperature sensor T1, the temperature of the hot water in the intermediate part of the hot water storage device 41 can be detected by the temperature sensor T2, and the temperature of the hot water in the lower part of the hot water storage device 41 is the temperature. It can be detected by the sensor T3. The detection results of the temperature sensors T1 to T3 are transmitted to the exhaust heat recovery control unit 45. Usually, the temperature of the hot water detected by the temperature sensor T1 is the highest, and the temperature of the hot water detected by the temperature sensor T2 and the temperature of the hot water detected by the temperature sensor T3 are sequentially decreased. The exhaust heat recovery control unit 45 determines that the heat stored in the hot water storage device 41 is full when all of the hot water temperatures detected by the temperature sensors T1 to T3 are equal to or higher than the set upper limit temperature. When the heat stored in the hot water storage device 41 is full, the temperature of the hot water supplied from the hot water storage device 41 to the heat exchanger 24 becomes equal to or higher than the set upper limit temperature. That is, the engine cooling water cannot be cooled well by heat exchange in the heat exchanger 24, and as a result, the engine 21 may not be cooled well.

The hot water storage device 41 is provided with a pressure sensor L that can detect the pressure of the hot water stored in the hot water storage device 41. The detection result of the pressure sensor L is transmitted to the exhaust heat recovery control unit 45. In the present embodiment, the hot water storage device 41 is configured as a sealed tank, and clean water is supplied from a water supply path (not shown) so as to keep the pressure of the hot water stored in the hot water storage device 41 at or above a set pressure value. For this reason, when water breakage or the like occurs and it becomes impossible to supply clean water, the pressure of hot water stored in the hot water storage device 41 decreases. Therefore, when the pressure of the hot water in the hot water storage device 41 detected by the pressure sensor L becomes less than the set pressure, the exhaust heat recovery control unit 45 determines that an abnormality such as a water outage has occurred. When such an abnormality occurs, the heat recovery operation and the heat supply operation in the exhaust heat recovery device 40 are hindered.
A flow rate sensor M capable of detecting a flow rate that is the amount of hot water flowing per unit time is provided in the middle of the exhaust heat recovery path 42. The detection result of the flow sensor M is transmitted to the exhaust heat recovery control unit 45. When the flow rate of hot water detected by the flow rate sensor M becomes less than the set lower limit flow rate, the exhaust heat recovery control unit 45 detects malfunctions such as malfunction of the exhaust heat recovery pump 43 and water leakage / blockage in the exhaust heat recovery path 42. It is determined that it has occurred. When such an abnormality occurs, the heat recovery operation in the exhaust heat recovery device 40 is hindered.
As described above, the pressure sensor L and the flow rate sensor M function as an abnormality detection unit that can detect an abnormality in the heat recovery operation in the exhaust heat recovery apparatus 40 or an abnormality in the heat supply operation.

Since the exhaust heat recovery apparatus 40 includes the above-described exhaust heat recovery pump 43, for example, the operation requires electric power. Therefore, the exhaust heat recovery apparatus 40 has a power connection terminal block 44 that can be connected to a power supply source, and operates using the power supplied to the power connection terminal block 44. An electric plug 6 is electrically connected to a power connection terminal block 44 provided in the exhaust heat recovery device 40. By attaching the electric plug 6 to the outdoor electric outlets 4 and 5 to which power is supplied. Power is supplied to the power connection terminal block 44 (ie, by connecting the power supply source and the power connection terminal block 44).
Furthermore, in the present embodiment, the bathroom heating / drying device 13 </ b> A as the power consuming heat utilization device E is electrically connected to the power connection terminal block 44. That is, the bathroom heating / drying apparatus 13 </ b> A operates by consuming electric power supplied via the power connection terminal block 44.

As described above, the outdoor electric outlet 4 and the indoor electric outlet 15 are the electric power supplied from the external electric power system 1 and the electric generator 22 during the interconnection operation in which the electric generator 22 is connected to the external electric power system 1. It functions as an electrical terminal for interconnection operation to which at least one of the generated electric power is supplied.
Moreover, the outdoor electrical outlet 5 and the indoor electrical outlet 12 are electrical terminals for independent operation to which electric power generated by the generator 22 is supplied during the autonomous operation in which the generator 22 is not linked to the external power system 1. Function as.
The electrical plug 6 connected to the power connection terminal block 44 functions as a connection terminal that can be selectively connected to the electrical terminal for interconnection operation and the electrical terminal for independent operation.

  The exhaust heat recovery device 40 can communicate information with the heat utilization device 13 via the communication line 2 and can communicate information with the power generation device 20 via the communication line 3. Can communicate with each other via the communication line 8. The power supply to the information output device 16 is performed from the exhaust heat recovery device 40 using the communication line 8. That is, the information output device 16 is also one of devices that operate using the power supplied to the power connection terminal block 44 of the exhaust heat recovery device 40.

[Power consumption type heat utilization device E]
Next, the operation control of the bathroom heating / drying apparatus 13A as the power consuming type heat utilization apparatus E that enables the user to use heat by consuming electric power and operating will be described.

  In both cases where the power generation device 20 is operated in an interconnected manner and when it is operated independently, the engine 21 of the power generation device 20 is cooled, that is, the exhaust heat of the engine 21 is recovered by the exhaust heat recovery device 40. is necessary. Note that just by recovering the exhaust heat of the engine 21 by the exhaust heat recovery device 40, the amount of heat stored in the hot water storage device 41 is increasing. Therefore, in this embodiment, when the heat recovery control unit 45 detects that the power generation operation control unit 29 has started the self-sustained operation of the power generation device 20, while the self-sustained operation of the power generation device 20 is being performed, Regardless of the amount of heat stored in the hot water storage device 41, heat is supplied from the hot water storage device 41 to the power consuming heat utilization device E to operate the power consuming heat utilization device E.

  Specifically, the exhaust heat recovery control unit 45 determines whether or not the power generation device 20 is operating in the self-sustained operation mode, and can detect that the self-sustained operation of the power generation device 20 has been started. Regardless of the amount of heat stored in the device 41, heat is supplied from the hot water storage device 41 to the bathroom heating / drying device 13A as the power consuming heat utilization device E to operate. By performing such operation control, it is possible to prevent the heat stored in the hot water storage device 41 from becoming full, so that the engine cooling water can be cooled well, and as a result, the engine 21 can be cooled well. .

  Alternatively, the exhaust heat recovery control unit 45 does not cause the operation of the bathroom heating / drying device 13A as the above-described power consumption type heat utilization device E regardless of the heat storage amount in the hot water storage device 41, but the exhaust heat recovery control unit. 45, while the self-sustaining operation of the power generator 20 is being performed, if the amount of heat stored in the hot water storage device 41 exceeds the set upper limit value, the hot water storage device 41 changes to the bathroom heating / drying device 13A as the power consuming heat utilization device E. You may make it operate the bathroom heating drying apparatus 13A by supplying heat. By performing such operation control, the hot water storage device 41 can store as much heat as possible, and the heat stored in the hot water storage device 41 can be less than the set upper limit. As a result, it is possible to cool the engine 21 satisfactorily while collecting a lot of heat in the hot water storage device 41 by collecting exhaust heat from the engine 21.

As described above, the configuration of the combined heat and power system has been described. However, by modifying a combined heat and power system with another configuration, a combined heat and power system similar to that described above can be constructed. The following describes how to modify the combined heat and power system.
First, as another heat and power cogeneration system, the external power system 1 and the power generation device 20 are connected to the distribution board 11 of the house 10, and the house 10 (that is, the power consumption device 14 and the power consumption type heat utilization device E). It is assumed that power is supplied only through the distribution board 11 and the exhaust heat recovery device 40 is configured to be supplied with power only from the power generation device 20.

  In such a combined heat and power supply system with a different configuration, when the power generation device 20 cannot operate independently, when the external power system 1 fails and the power generation device 20 stops operation, the house 10 and the exhaust heat recovery device 40 are stopped. Power supply cannot be performed. In addition, if it replaces with the power generating device 20 of the structure which can be operated independently, the power generating device 20 can be operated even during a power failure of the external power system 1, but the power generating device 20 is disconnected from the distribution board 11 from the viewpoint of preventing independent operation. There must be. Therefore, even if the power generation apparatus 20 is operated independently, the exhaust heat recovery apparatus 40 can be supplied with power, but the house 10 configured to receive power only from the distribution board 11 is not provided inside the house 10. It is not possible to supply power. That is, the exhaust heat recovery device 40 can receive supply of electric power generated by the power generation device 20 during the self-sustained operation of the power generation device 20, so that exhaust heat recovery from the engine 21, that is, cooling of the engine 21 can be performed. Can be done. However, since power cannot be supplied to the power consumption type heat utilization device E of the house 10 (that is, heat cannot be used in the power consumption type heat utilization device E), the heat stored in the exhaust heat recovery device 40 is full. Therefore, there may occur a situation in which exhaust heat recovery from the engine 21 cannot be performed, that is, the engine 21 cannot be cooled well.

  Therefore, in a heat and power supply system having another configuration, a power connection terminal block 44 that can be connected to a power supply source is additionally provided in the exhaust heat recovery device 40, and the power supplied to the power connection terminal block 44 is used to exhaust the power. The heat recovery apparatus 40 is operated. Further, the power consumption type heat utilization device E is connected to the power connection terminal block 44 provided in the exhaust heat recovery device 40, and the power supplied to the power connection terminal block 44 is used to use the power consumption type heat utilization device. Let device E operate. Furthermore, an electric plug 6 connected to the power connection terminal block 44 is provided, and the electric power and generator supplied from the external power system 1 during the linked operation in which the generator 22 is linked to the external power system 1 At the time of self-sustaining operation in which at least one of the electric power generated at 22 is supplied to the connected operation electric terminal (outdoor electric outlet 4 and indoor electric outlet 15) and the generator 22 is not connected to the external electric power system 1 Select one of the electric terminals for outdoor operation (outdoor electric outlet 5 and indoor electric outlet 12) to which the electric power generated by the generator 22 is supplied as an electric power supply source for supplying electric power to the power connection terminal block 44. Make it possible.

By performing such modifications, a power connection terminal block 44 that can be connected to a power supply source is provided in the exhaust heat recovery device 40, and the electrical terminals for the connected operation (the outdoor electrical outlet 4 and the indoor electrical outlet 15) and the independent operation are provided. One of the electrical terminals for the time (outdoor electrical outlet 5 and indoor electrical outlet 12) can be selected as a power supply source for supplying power to the power connection terminal block 44, so that the generator 22 is connected to the external power system. 1 can be operated by supplying electric power to the exhaust heat recovery device 40 in both the interconnecting operation connected to 1 and the independent operation in which the generator 22 is not connected to the external power system 1. .
Further, the power consumption type heat utilization device E is connected to the power connection terminal block 44 provided in the exhaust heat recovery device 40, and the power supplied to the power connection terminal block 44 is utilized to use the power consumption type heat utilization. Since the apparatus E is operated, the power consumption type heat utilization apparatus E together with the exhaust heat recovery apparatus 40 is also connected to the external power system 1 during the connected operation and the generator 22 is externally connected. It is possible to operate by receiving power supply in any of the independent operation not linked to the power system 1. In particular, since the power supply path to the exhaust heat recovery device 40 and the power consuming heat utilization device E can be switched at once via the power supply connection terminal block 44, the power generation device 20 can be operated during the self-sustaining operation of the power generation device 20. Therefore, it is possible to supply power to a device that needs to be supplied with power by a simple method.

  Next, the operation of the power generation device 20 and the exhaust heat recovery device 40 in a state where power supply from the external power system 1 is normally performed and a state where power supply from the external power system 1 is stopped will be described. To do. FIG. 2 is a flowchart for explaining operations of the power generation device 20 and the exhaust heat recovery device 40. First, the outline will be described. The power generation operation control unit 29 of the power generation apparatus 20 is configured so that the exhaust heat recovery control unit 45 of the exhaust heat recovery apparatus 40 is connected during the interconnection operation in which the generator 22 is connected to the external power system 1. It operates in a linked operation mode in which operation control of the engine 21 and the generator 22 is performed according to an operation control command including an operation start command and an operation stop command given to the power generation device 20 according to a predetermined operation plan, and the generator The exhaust heat recovery control unit 45 controls the power generation device 20 while performing the operation control for continuously operating the engine 21 and the generator 22 without stopping the engine 21 and the generator 22 during the self-sustaining operation in which the power supply 22 is not connected to the external power system 1. It operates in a self-sustaining operation mode in which the operation of the engine 21 and the generator 22 is stopped in response to an emergency stop command to be given.

  Specifically, in step # 10, the exhaust heat recovery control unit 45 determines whether or not the power generation device 20 is in operation. The exhaust heat recovery control unit 45 proceeds to step # 12 when it is determined that the power generation device 20 is in operation, and proceeds to step # 24 when it is determined that the power generation device 20 is stopped. The fact that the exhaust heat recovery control unit 45 can perform such determination processing means that electric power is supplied to the exhaust heat recovery device 40. In other words, power is supplied to the power connection terminal block 44 of the exhaust heat recovery apparatus 40 via the outdoor electrical outlet 4 or the outdoor electrical outlet 5. Note that whether the electric plug 6 connected to the power connection terminal block 44 is attached to the outdoor electric outlet 4 or the outdoor electric outlet 5 is selected by the user, and the exhaust heat recovery device 40 is an electric plug. It cannot be determined whether 6 is attached to the outdoor electrical outlet 4 or the outdoor electrical outlet 5.

[In connected operation]
When the power supply from the external power system 1 is normally performed, at least power from the external power system 1 is supplied to the distribution board 11, and if the generator 22 is operating, the generator 22 also Power is supplied. In this case, the user has connected the electrical plug 6 to the outdoor electrical outlet 4, and as a result, the exhaust heat recovery device 40 has at least the power supplied from the external power system 1 and the power generated by the generator 22. One supply can be received. That is, when the power supply from the external power system 1 is normally performed, the exhaust heat recovery device 40 is always supplied with power, and the determination of the step # 10 shown in FIG. 2 can be performed. However, the exhaust heat recovery control unit 45 performs an operation control of the engine 21 and the generator 22 according to an operation control command including an operation start command and an operation stop command given to the power generation device 20 according to a predetermined operation plan. Operates in operation mode. Therefore, when the power supply from the external power system 1 is normally performed, the engine 21 and the generator 22 of the power generation apparatus 20 may be stopped in accordance with a predetermined operation plan.

[When a power failure occurs]
When the power supply from the external power system 1 is normally performed and the power supply from the external power system 1 is not normally performed (that is, when a power failure occurs in the external power system 1) ) The power generation operation control unit 29 stops the operation of the engine 21 and the generator 22. As a result, no power is supplied to the indoor unit, the power generation device 20 and the exhaust heat recovery device 40. In addition, the electric power generating apparatus 20 becomes a structure which can be operated independently. For example, first, the user attaches the electrical plug 6 to the outdoor electrical outlet 5, and the power connection terminal block 44 of the exhaust heat recovery device 40 is electrically connected to the self-sustained output end 28 of the generator 22. Like that. Further, the user attaches the electric plug 7 to the indoor electric outlet 12 so that the power consuming device 14 </ b> B is electrically connected to the self-sustained output end 28 of the generator 22.
Thereafter, the user manually operates the starter device 23 after switching the power generation device 20 to a state in which the operation in the self-sustained operation mode is permitted using the mode changeover switch (not shown). The power generator 22 is activated and the power generation operation (independent operation) of the power generator 22 is started. As a result, power supply to the power connection terminal block 44 of the exhaust heat recovery device 40 is started, and power supply to the power consumption device 14B is started. That is, in this case, since the power is supplied to the exhaust heat recovery device 40 as a result of the power generation device 20 being activated, in the step # 10 in which power is supplied to the exhaust heat recovery device 40, power generation is performed. The device 20 is always in operation.

  Further, the exhaust heat recovery control unit 45 communicates an inquiry about whether it is operating in the grid operation mode or the independent operation mode to the power generation operation control unit 29 of the power generation device 20 at an appropriate timing. This is done via line 3. On the other hand, the power generation operation control unit 29 transmits to the exhaust heat recovery control unit 45 via the communication line 3 whether it is operating in the interconnection operation mode or the autonomous operation mode. Specifically, the power generation operation control unit 29 switches the mode changeover switch (not shown) described above to the power generation apparatus 20 in any operation mode of the interconnection operation mode and the independent operation mode. Recognizes whether movement is allowed. As a result, the power generation operation control unit 29 can immediately make an answer when there is an inquiry from the exhaust heat recovery control unit 45 about the interconnection operation mode or the independent operation mode.

  Further, the exhaust heat recovery control unit 45 stores, in its own internal memory (not shown) or the like, information on whether the power generation device 20 is operating in the interconnection operation mode or the independent operation mode. deep. By doing so, the exhaust heat recovery control unit 45 can perform operation control of the exhaust heat recovery device 40 depending on whether the power generation operation control unit 29 is operating in the grid operation mode or the independent operation mode. it can. For example, when the power generation device 20 is operating in the interconnected operation mode, the exhaust heat recovery control unit 45 gives an operation control command including an operation start command and an operation stop command to the power generation device 20 according to a predetermined operation plan. The operation control is performed. Further, when the power generation device 20 is operating in the self-sustaining operation mode, the exhaust heat recovery control unit 45 recovers heat recovered from exhaust heat from the power generation device 20 (engine 21) that performs the power load following operation as described later. Operation and control are performed such that heat recovered from the operation and power generation apparatus 20 is supplied to the power consuming heat utilization apparatus E to operate the power consuming heat utilization apparatus E.

If the exhaust heat recovery control unit 45 determines in step # 10 that the power generation device 20 is not in operation, in step # 24, whether or not the operation start timing of the power generation device 20 is based on the operation plan as described above. Determine. Then, when it is the operation start timing of the power generation device 20, the exhaust heat recovery control unit 45 proceeds to step # 26 to start the operation of the power generation device 20, and then in step # 28, the power generation device according to a predetermined operation plan. 20 is operated for power generation. Although not shown in FIG. 2, the exhaust heat recovery control unit 45 may transfer control to step # 18 described later, following step # 28.
On the other hand, if the exhaust heat recovery control unit 45 determines in step # 24 that it is not the operation start timing of the power generation apparatus 20, the process returns to the beginning of this flowchart.

  If the exhaust heat recovery control unit 45 determines in step # 10 that the power generation device 20 is operating, in step # 12, the power generation device 20 is operating in the interconnected operation mode or operated in the self-sustaining operation mode. Judge whether it is. In step # 12, the exhaust heat recovery control unit 45 proceeds to step # 14 when the power generation device 20 is operating in the self-sustaining operation mode, and when the power generation device 20 is operating in the grid operation mode. To step # 28. The power generation device 20 performs a power load following operation while operating in the self-sustaining operation mode. As a result, the house 10 can use the power supplied from the generator 22 even if the power supply from the external power system 1 is not normally performed.

  In step # 14 (that is, in a state where the power generation device 20 performs the power load following operation in the self-sustaining operation mode), the exhaust heat recovery control unit 45 performs a heat recovery operation for recovering the exhaust heat from the engine 21. Further, the exhaust heat recovery control unit 45 can also perform a heat supply operation for supplying the heat recovered from the engine 21 to the power consumption heat utilization apparatus E and operating the power consumption heat utilization apparatus E. Specifically, the exhaust heat recovery control unit 45 supplies the heat recovered from the engine 21 and stored in the hot water storage device 41 to the power consumption type heat utilization device E to operate the power consumption type heat utilization device E. Heat supply operation can be performed. As described above, the hot water heated by the heat recovered from the engine 21 flows into the hot water storage device 41, and the hot water heated by the heat recovered from the engine 21 is the hot water storage device 41. When the operation mode is such that the operation mode supplied to the heat utilization device 13 without being routed can be selectively switched, the exhaust heat recovery control unit 45 passes the heat collected from the engine 21 via the hot water storage device 41. It is also possible to perform a heat supply operation in which the power consumption type heat utilization apparatus E is supplied to operate the power consumption type heat utilization apparatus E.

  The heat supply operation will be further described. For example, when the exhaust heat recovery control unit 45 can detect that the self-sustained operation of the power generation apparatus 20 has been started, the heat recovery operation described above regardless of the amount of heat stored in the hot water storage device 41. And heat supply operation. That is, the exhaust heat recovery control unit 45 performs a heat recovery operation for recovering exhaust heat from the engine 21 and the engine 21 regardless of the amount of heat stored in the hot water storage device 41 while the power generation device 20 is operating independently. The heat recovered from the water and stored in the hot water storage device 41 is supplied to the power consumption heat utilization device E, or the heat recovered from the engine 21 is supplied to the power consumption heat utilization device E without passing through the hot water storage device 41. Both of the heat supply operation for operating the power consumption type heat utilization apparatus E are performed. By performing such an operation control, an operation for reducing the heat stored in the hot water storage device 41 or an operation for preventing new heat from being stored in the hot water storage device 41 is performed. It is possible to avoid the stored heat from becoming full. As a result, the engine coolant can be cooled well, and the engine 21 can be cooled well.

  Alternatively, the exhaust heat recovery control unit 45 does not cause the bathroom heating / drying device 13 </ b> A as the above-described power consumption type heat utilization device E to operate regardless of the amount of heat stored in the hot water storage device 41, but is independent of the power generation device 20. While the operation is being performed, both the heat recovery operation and the heat supply operation described above may be performed when the amount of heat stored in the hot water storage device 41 is equal to or greater than the set upper limit value. That is, the exhaust heat recovery control unit 45 recovers the exhaust heat from the engine 21 when the heat storage amount in the hot water storage device 41 is equal to or higher than the set upper limit value while the power generation device 20 is being operated independently. Then, the heat recovered from the engine 21 and stored in the hot water storage device 41 is supplied to the electric power consumption type heat utilization device E, or the heat recovered from the engine 21 is not passed through the hot water storage device 41. You may perform both with the heat supply operation which supplies to E and operates the electric power consumption type heat utilization apparatus E. By performing such operation control, the hot water storage device 41 can store as much heat as possible about the set upper limit value, and when the heat storage amount in the hot water storage device 41 exceeds the set upper limit value, the hot water storage device 41 stores the heat. Since the operation for reducing the heat being stored or the operation for not newly storing heat in the hot water storage device 41 is performed, the heat stored in the hot water storage device 41 can be prevented from greatly exceeding the set upper limit. . As a result, it is possible to cool the engine 21 satisfactorily while collecting a lot of heat in the hot water storage device 41 by collecting exhaust heat from the engine 21.

  During the self-sustaining operation of the power generation device 20 as described above, regardless of the amount of heat stored in the hot water storage device 41 or when the amount of heat stored in the hot water storage device 41 exceeds the set upper limit value, the power consumption from the hot water storage device 41 is consumed. An electric power load is generated by performing a heat supply operation for supplying heat to the bathroom heating / drying device 13A as the mold heat utilization device E and operating the bathroom heating / drying device 13A. Further, in the exhaust heat recovery device 40, for example, an electric load is generated in order to operate the exhaust heat recovery pump 43 in the heat recovery operation. In addition, there is a case where the electric plug 7 is attached to the indoor electric outlet 15 and a power load is generated in the power consuming device 14B. It is preferable to supply sufficient power to such a power load. Therefore, the power generation operation control unit 29 is configured such that the generator 22 is connected to the exhaust heat recovery device 40, the power consumption device 14, and the power consumption type heat during the self-sustaining operation where the generator 22 is not linked to the external power system 1. Operation control (that is, power load follow-up control) for continuously generating power corresponding to the power load of the utilization device E is performed.

  Thus, even when a power failure occurs in the external power system 1, the power to the house 10 and the exhaust heat recovery device 40 can be obtained by operating the generator 22 independently without being connected to the external power system 1. Supply can be made. In particular, in the present embodiment, the power generation operation control unit 29 performs operation control for continuously operating the generator 21 and the generator 22 without stopping them during the self-sustaining operation in which the generator 22 is not linked to the external power system 1. Therefore, it is possible to continue using the desired electrical equipment during a power failure in the external power system 1. In addition, the exhaust heat recovery device 40 can receive supply of electric power generated by the generator 22 during the self-sustained operation of the generator 22, so that exhaust heat recovery from the engine 21, that is, cooling of the engine 21 can be performed. Can be done. Furthermore, since the electric power consumption type heat utilization apparatus E can receive supply of the electric power generated by the generator 22 during the self-sustaining operation of the generator 22, the operation using the heat stored in the exhaust heat recovery apparatus 40 is also possible. Can continue. That is, it is possible to avoid a situation in which the heat stored in the exhaust heat recovery device 40 is full and exhaust heat cannot be recovered from the engine 21, that is, the engine 21 cannot be cooled well.

  Next, in step # 16, the exhaust heat recovery control unit 45 determines whether or not the external power system 1 has recovered. As described above, in the present embodiment, the received power detection means Wa detects the received power upstream of the distribution board 11 (external power system 1 side), and the detection result is the power generation operation control of the power generator 20. Is transmitted to the unit 29 via the communication line 9, and further transmitted to the exhaust heat recovery control unit 45 of the exhaust heat recovery device 40 via the communication line 3. As a result, the exhaust heat recovery control unit 45 can determine that the external power system 1 has recovered when the received power detection means Wa detects the received power equal to or greater than a predetermined value. Then, the exhaust heat recovery control unit 45 proceeds to step # 30 when it is determined that the external power system 1 has recovered, and when it is determined that the external power system 1 has not recovered power, the process # 18. Migrate to

  For example, if it is determined that the external power system 1 has recovered, the exhaust heat recovery control unit 45 proceeds to step # 30 and notifies the house 10 that the external power system 1 has recovered. Specifically, the exhaust heat recovery control unit 45 transmits to the information output device 16 that the external power system 1 has been restored via the communication line 8, and from the information output means 16A of the information output device 16, Information that the external electric power system 1 has recovered is notified. The user who has received the notification stops the operation of the power generation device 20 and the heat utilization device 13, and then reattaches the electrical plug 6 to the outdoor electrical outlet 4, and attaches the electrical plug 7 to the indoor electrical outlet 15. As a result, at least power from the external power system 1 is supplied to the power consuming device 14 of the house 10 via the distribution board 11, and the exhaust heat recovery device 40 is also supplied from the external power system 1. Is supplied via the distribution board 11 and the power connection terminal block 44.

  On the other hand, if it is determined in step # 16 that the external power system 1 has not recovered power, the exhaust heat recovery control unit 45 proceeds to step # 18, and the emergency stop condition of the power generator 20 is satisfied. It is determined whether or not it has been done. The exhaust heat recovery control unit 45 detects this emergency when an abnormality in the heat recovery operation in the exhaust heat recovery device 40 or an abnormality in the heat supply operation is detected by the pressure sensor L or the flow rate sensor M as the abnormality detection means. It is determined that the stop condition is satisfied. When it is determined that the emergency stop condition is not satisfied, the exhaust heat recovery control unit 45 returns to the beginning of this flowchart. If the exhaust heat recovery control unit 45 determines in step # 18 that the emergency stop condition has been satisfied, the process proceeds to step # 20, and a command for notifying the information output device 16 of the emergency stop in the house 10 is issued. Is transmitted via the communication line 8. As a result, in the house 10, the information output unit 16 </ b> A of the information output device 16 notifies that the power generation device 20 is urgently stopped. Thereafter, the exhaust heat recovery control unit 45 proceeds to step # 22 and transmits an emergency stop command to the power generation apparatus 20 via the communication line 3. And the electric power generating apparatus 20 performs control which stops the driving | operation of the engine 21 and a generator according to an emergency stop command. In other words, the power generation device 20 is forcibly stopped due to the circumstances on the exhaust heat recovery device 40 side even during the self-sustaining operation.

  As described above, the power generation operation control unit 29 performs control to stop the operation of the engine 21 and the generator in accordance with the emergency stop command given to the power generation device 20 by the exhaust heat recovery control unit 45. In some cases, the exhaust heat recovery control unit 45 needs to be urgently stopped while continuously supplying power to the house 10 and the exhaust heat recovery device 40 by operating the engine 21 and the generator 22 without stopping. In such a case, the emergency stop can be accepted and the failure can be avoided in advance.

<Another embodiment>
<1>
In the above embodiment, the configuration of the facility provided with the combined heat and power system has been described with reference to a specific example as shown in FIG. 1, but the configuration can be changed as appropriate. For example, although the bathroom heating / drying apparatus 13A has been described as an example of the power consuming heat utilization apparatus E, another apparatus may be used as the power consuming heat utilization apparatus E. In addition, the number of installed indoor electrical outlets and outdoor electrical outlets, installation locations, and the like can be changed as appropriate.

<2>
In the above-described embodiment, the example in which the pressure sensor L and the flow rate sensor M are used as an abnormality detection unit that can detect an abnormality in the heat recovery operation in the exhaust heat recovery apparatus 40 or an abnormality in the heat supply operation has been described. You may utilize an apparatus as an abnormality detection means. For example, a temperature sensor that detects the temperature of hot water flowing through the exhaust heat recovery passage 42 or the temperature of engine cooling water flowing through the cooling water circulation passage 25 is provided as an abnormality detection means, and if the detected temperature is equal to or higher than a set upper limit temperature, an abnormality You may comprise so that it may determine with having generate | occur | produced.

  INDUSTRIAL APPLICABILITY The present invention can be used for a combined heat and power system that can prevent power failure while avoiding the occurrence of a failure while continuously supplying power by continuously operating a power generator during a power failure of an external power system.

1 External Power System 13 Heat Utilization Device 13A Bathroom Heating Dryer (Power Consumption Type Heat Utilization Device E)
13B Floor heating device 13C Hot water supply device 14 Power consumption device 14A Power consumption device 14B Power consumption device 16 Information output device 20 Power generation device 21 Engine 22 Generator 29 Power generation operation control unit 40 Waste heat recovery device 45 Waste heat recovery control unit L Pressure sensor (Abnormality detection means)
M Flow sensor (Abnormality detection means)

Claims (5)

A power generation device having an engine, a generator driven by the engine, a power generation operation control unit for controlling the operation of the engine and the power generator, and heat can be used by a user by operating the power And a heat recovery operation for recovering exhaust heat from the engine and heat for supplying the recovered heat to the power consumption heat utilization device and operating the power consumption heat utilization device A combined heat and power system comprising an exhaust heat recovery device having an exhaust heat recovery control unit for controlling supply operation,
The exhaust heat recovery device and the power consuming heat utilization device are generated by the electric power supplied from the external electric power system and the electric generator during the interconnection operation in which the electric generator is connected to the external electric power system. So that at least one of the generated electric power can be received, and the electric power generated by the generator can be received during the self-sustaining operation in which the generator is not connected to the external power system. Composed of
The exhaust heat recovery device stores hot water, a hot water storage device to which clean water is supplied from a water supply path so as to keep the pressure of the stored hot water at a set pressure value or more, and the hot water storage device and the engine cooling of the engine An exhaust heat recovery path through which hot water flows between heat exchangers to which water heat is transferred, an exhaust heat recovery pump that adjusts the flow rate of hot water in the exhaust heat recovery path, an abnormality in the heat recovery operation, or the heat supply An abnormality detection means capable of detecting an abnormality in operation,
The power generation operation control unit performs the operation control to continuously operate the generator and the generator without stopping during the independent operation in which the generator is not connected to the external power system, and the exhaust heat recovery is performed. In response to an emergency stop command given to the power generator by the control unit, the engine and the generator operate in a self-sustaining operation mode that stops operation ,
The abnormality detection means has a pressure sensor capable of detecting the pressure of hot water stored in the hot water storage device, and determines that an abnormality has occurred when the pressure detected by the pressure sensor becomes less than the set pressure value,
The exhaust heat recovery control unit is a cogeneration system that gives the emergency stop command to the power generation device when the abnormality detection means detects an abnormality . A power generation device having an engine, a generator driven by the engine, a power generation operation control unit for controlling the operation of the engine and the power generator, and heat can be used by a user by operating the power And a heat recovery operation for recovering exhaust heat from the engine and heat for supplying the recovered heat to the power consumption heat utilization device and operating the power consumption heat utilization device A combined heat and power system comprising an exhaust heat recovery device having an exhaust heat recovery control unit for controlling supply operation,
The exhaust heat recovery device and the power consuming heat utilization device are generated by the electric power supplied from the external electric power system and the electric generator during the interconnection operation in which the electric generator is connected to the external electric power system. So that at least one of the generated electric power can be received, and the electric power generated by the generator can be received during the self-sustaining operation in which the generator is not connected to the external power system. Composed of
The exhaust heat recovery device stores hot water, a hot water storage device to which clean water is supplied from a water supply path so as to keep the pressure of the stored hot water at a set pressure value or more, and the hot water storage device and the engine cooling of the engine An exhaust heat recovery path through which hot water flows between heat exchangers to which water heat is transferred, an exhaust heat recovery pump that adjusts the flow rate of hot water in the exhaust heat recovery path, an abnormality in the heat recovery operation, or the heat supply An abnormality detection means capable of detecting an abnormality in operation,
The power generation operation control unit performs the operation control to continuously operate the generator and the generator without stopping during the independent operation in which the generator is not connected to the external power system, and the exhaust heat recovery is performed. In response to an emergency stop command given to the power generator by the control unit, the engine and the generator operate in a self-sustaining operation mode that stops operation,
The abnormality detecting means includes a flow rate sensor capable of detecting a flow rate that is the amount of hot water flowing in the exhaust heat recovery path per unit time, and an abnormality occurs when the flow rate of hot water detected by the flow rate sensor is less than a set lower limit flow rate. Is determined to have occurred,
The exhaust heat recovery control unit is a cogeneration system that gives the emergency stop command to the power generation device when the abnormality detection means detects an abnormality . In addition to the operation in the self-sustaining operation mode, the power generation operation control unit is configured so that the exhaust heat recovery control unit is in accordance with a predetermined operation plan at the time of interconnection operation in which the generator is linked to the external power system. 3. The combined heat and power supply according to claim 1, wherein the operation is performed in a connected operation mode in which operation control of the engine and the generator is performed in accordance with an operation control command including an operation start command and an operation stop command given to the power generation device. system. The cogeneration system according to claim 3, wherein the power generation operation control unit transmits to the exhaust heat recovery control unit whether the power generation operation control unit is operating in the interconnection operation mode or the self-sustained operation mode. In a self-sustaining operation where the power generator is not linked to the external power system, the power consumption device operates by receiving the supply of power generated by the power generator,
The power generation operation control unit is configured such that the generator generates power from the exhaust heat recovery device, the power consumption device, and the power consumption type heat utilization device during a self-sustained operation in which the generator is not linked to the external power system. The combined heat and power system according to any one of claims 1 to 4, wherein operation control for continuously generating electric power corresponding to a load is performed.

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