JP3843023B2 - Cogeneration system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the configuration of a small cogeneration system that generates power and supplies hot water.
[0002]
[Prior art]
A cogeneration system operates a generator with the driving force of an internal combustion engine such as an engine, recovers heat from the power generation and cooling water or exhaust gas of the internal combustion engine, generates hot water or steam, and supplies hot water or air conditioning. It is common to supply heat for use.
[0003]
When fuel is burned to perform power generation and hot water supply, a power generation control unit that controls the power generation side 110 is configured by a power generation side 110 and a heat recovery side 111, as schematically shown in FIG. 25, the first three-way valve 22 is provided in the cooling water passage extending from the engine 1, and one of the cooling water passages returns to the engine 1 via the cooling water pump 10, and the other is the primary side of the water heat exchanger 8. And a second three-way valve 23 is provided at the tip of the cooling water channel extending from the outlet of the water heat exchanger 8, one of which serves as a cooling water channel that returns to the engine 1 via the cooling water pump 10, and the other is radiating heat. It is configured as a cooling water path that circulates the vessel 11 and returns to the engine 1 via the cooling water pump 10, and the operation of the engine 1 is started by the power generation control unit 25, and at this time the temperature of the cooling water is low, Let the cooling water channel shown by the solid line arrow d circulate, The engine 1 is warmed up, and when the temperature of the cooling water reaches a temperature that can be used for heat recovery to the hot water supply, the cooling water is circulated to the primary side of the water heat exchanger 8 as indicated by a dashed arrow e. The cooling water path to be selected is selected to perform heat recovery, and the temperature of the cooling water further increases, and the temperature of the cooling water reaches a temperature at which the engine 1 can be cooled even after heat recovery in the water heat exchanger 8. When the temperature does not decrease, a cooling water passage for flowing the cooling water to the primary side of the water heat exchanger 8 and the radiator 11 as indicated by a one-dot broken line arrow f is selected, and from a cooling water temperature sensor (not shown) The air blower 12 is operated from the power generation control unit 25 by the temperature signal of, the cooling by the radiator 11 is performed, the operation is performed while stabilizing the temperature of the cooling water, and the heat recovery to the heat recovery side is performed. .
[0004]
Further, a heat recovery control unit 26 for controlling the heat recovery side 111 is provided, a hot water supply tank 15 provided with a water supply pipe 13 and a hot water supply pipe 14 is provided, and further, from the vicinity of the bottom of the water stored in the hot water supply tank 15. Heat receiving pipes 24a and 24b are provided for taking water and circulating to the secondary side of the water heat exchanger 8 using the circulation pump 16, and heat is generated by a temperature signal from a temperature sensor 27 provided in the hot water tank 15. The circulation pump 16 is operated from the recovery control unit 26, heat is recovered from the cooling water of the engine 1 on the power generation side 110 via the water heat exchanger 8, and the hot water is stored in the hot water tank 15 to supply hot water. .
[0005]
Here, the apparatus other than the above shown in FIG. 6 will be described. 2 is a fuel supply apparatus that supplies fuel for the engine 1, 3 is an intake apparatus that sucks combustion air, and 4 is the fuel and the combustion. Reference numeral 5 denotes an exhaust device that exhausts the combustion gas burned in the engine 1.
[0006]
Reference numeral 6 denotes a power generator driven by the driving force generated by the combustion of the engine 1, and reference numeral 7 denotes a distribution that converts the generated power into a commercial power frequency and supplies the power in synchronization with the commercial power frequency. An apparatus 12 is a blower that blows air to the radiator 11.
[0007]
In addition, when installing a cogeneration system, the power generation side and the hot water supply side are independent constructions, and therefore, as shown in FIG. It was done.
[0008]
[Problems to be solved by the invention]
However, when considering a small cogeneration system for home use, the circulation pump for recovering heat to the hot water stored in the hot water tank is about several hundred watts. However, since the engine is also downsized and the amount of power generated is naturally several kilowatts, the ratio of the amount of power consumed for operation to the amount of power generated by this cogeneration system increases. As a result, the final power generation efficiency was reduced.
[0009]
In addition, by installing this circulation pump and a water heat exchanger, the cost has naturally increased.
[0010]
For this reason, in this small-sized cogeneration system, it has been desired to reduce the power consumption and the cost consumed in the system.
[0011]
The object of the present invention is to provide a control unit common to the power generation side and the heat recovery side and integrate them so as to suppress the power consumed in the cogeneration system as much as possible, improve the power generation efficiency and reduce the cost. The purpose is to provide a cogeneration system characterized by the suppression.
[0012]
[Means for Solving the Problems]
The invention according to claim 1 is a cogeneration system in which the cooling water of the internal combustion engine is circulated by a cooling water pump, and hot water is stored in the hot water tank by the heat of the cooling water. The outer wall of the hot water tank or the inside of the hot water tank is circulated by the cooling water pump of the cooling water, and during the warm-up operation of the internal combustion engine, the outer wall of the hot water tank or the hot water tank A bypass cooling water channel is provided that bypasses the cooling water channel disposed in the interior and circulates the cooling water.
[0013]
The invention according to claim 2 is characterized in that, in the invention according to claim 1, the cooling water channel provided on the outer wall of the hot water tank is provided at least in a portion centering on the outer wall near the bottom of the hot water tank. It is what.
[0014]
The invention according to claim 3 is the one according to claim 1, wherein the cooling water channel provided inside the hot water tank is submerged in water stored in the hot water tank, It is provided near the bottom.
[0015]
The invention according to claim 4 is the one according to claim 1 or 3, wherein the cooling water channel provided near the bottom of the hot water tank is a double pipe, and the outer pipe and the inner pipe of the double pipe A space between them is opened on the outer wall of the hot water tank.
[0016]
According to a fifth aspect of the present invention, there is provided the control system according to any one of the first to fourth aspects, further comprising a control unit that controls the internal combustion engine, the cooling water pump, and the hot water tank. And the cooling water pump and the hot water tank are integrated.
[0018]
According to a sixth aspect of the present invention, there is provided the radiator according to the sixth aspect, wherein a radiator that dissipates heat that cannot be recovered in the hot water tank is provided on the cooling water channel, and the multi-stage speed adjustment type is further provided to the radiator. Alternatively, any one of continuously variable speed blowers is provided, and the blower amount of the blower is controlled by the temperature of the cooling water flowing through the cooling water channel.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0020]
Referring to FIG. 1, FIG. 1 is a diagram showing a configuration in which a common control unit is provided on the power generation side and the heat recovery side according to the present invention, and the power consumption in the cogeneration system is suppressed as much as possible by integrating them. It is the figure which showed the outline about an example of the cogeneration system which suppressed efficiency while improving efficiency.
[0021]
First, the configuration of the cogeneration system 100 will be described. The engine 1 includes a fuel gas supplied from the fuel supply device 2 and the intake device 3 and combustion air taken in through the mixer 4 and combusted combustion gas. Is discharged through the exhaust device 5. At this time, the generator 6 is operated by the generated driving force of the engine 1, and the power is supplied via the power distribution device 7.
[0022]
A cooling water passage through which cooling water for cooling the engine 1 circulates extends from the engine 1 and is provided as a heat supply pipe 19 on the outer wall of the hot water tank 15. The heat supply pipe 19 is connected to the three-way valve 9. Branched in two directions, one flowing in the direction of arrow a and returning to the engine 1 via the cooling water pump 10, and the other flowing in the direction of arrow b and passing through the radiator 11, the cooling water pump The heat radiator 11 receives air from the blower 12 and does not completely recover the heat in the heat supply pipe 19 and does not fall down to a predetermined temperature. It is configured to release excess heat from the cooling water to the atmosphere.
[0023]
The three-way valve 9 used here is filled with an encapsulating material such as oil or wax, and the volume of the encapsulating material changes automatically depending on the temperature of the circulating cooling water. For example, when the operation temperature of the three-way valve 9 is assumed to be about 80 ° C., the flow rate of the circulating cooling water is less than 80 ° C. For example, the three-way valve 9 causes the cooling water to flow through the cooling water channel in the direction of arrow a. When the temperature of the cooling water exceeds about 80 ° C., the three-way valve 9 causes the cooling water to flow through the cooling water channel in the direction of arrow b. ing.
[0024]
Further, in the hot water tank 15, the warmed hot water stays in the upper part, so that the heat supply pipe 19 is provided around the lower part of the outer wall, and is sufficiently insulated from the outside. It has become. As described above, since the heat supply pipe 19 is provided on the outer wall of the hot water tank 15, heat is radiated into the hot water tank 15, but is also radiated toward the outside of the hot water tank 15, This is because the heat recovery efficiency may be reduced.
[0025]
The hot water tank 15 is provided with a water supply pipe 13 that opens near the bottom of the interior and replenishes the stored water, and is provided with a hot water supply pipe 14 that takes water from the upper part of the stored water and supplies hot water. ing. Further, the hot water tank 15 is a sealed container. When hot water is supplied from the hot water supply pipe 14, the hot water tank 15 has a negative pressure, and the hot water is supplied from the water supply pipe 13. Therefore, the water stored in the hot water tank 15 is always a constant amount.
[0026]
Further, a temperature sensor 18 is provided on the cooling water passage connected from the heat supply pipe 19 to the three-way valve 9, and the cooling water pump 10, and a program built in the common control unit 17 that controls the cogeneration system 100, The blower 12 and the like are turned on and off.
[0027]
When the operation of the cogeneration system 100 is started, an operation signal is output from the common control unit 17 to the engine 1, the fuel supplied from the fuel supply device 2, and the combustion air taken in by the intake device 3. Are mixed by the mixer 4 and the mixed gas is sucked and combusted. The engine 1 starts operation, the power generation device 6 is operated by the driving force, and the power distribution device 7 receives the power generation from the power generator 6. Then, this is converted into a commercial power supply frequency, and at the same time, synchronized with the phase of the commercial power supply frequency, power supply to the home wiring is started.
[0028]
In the common control unit 17, the cooling water pump 10 is operated simultaneously with the transmission of the operation signal to the engine 1 to circulate the cooling water into the cooling water channel. However, since the temperature of the cooling water is still low, The three-way valve 9 is selected in the direction of arrow a.
[0029]
For this reason, when the cooling water flows out from the engine 1, it flows through the heat supply pipe 19, flows through the three-way valve 9 in the direction of the arrow a, and follows the cooling water path returning to the engine 1 via the cooling water pump 10. The engine 1 is warmed up.
[0030]
At this time, since the cooling water is in a warm-up operation while heat recovery is performed in the hot water tank 15 when passing through the heat supply pipe 19, the rise in the cooling water temperature during the warm-up operation of the engine 1 is However, since the temperature of the water stored in the hot water tank 15 rises at the same time as the temperature of the cooling water rises, the temperature of the cooling water for the engine 1 shown in FIG. After rising, the circulation pump 16 is operated to start supplying heat to the hot water tank 15, and then there is no time delay that the temperature of the water stored in the hot water tank 15 rises.
[0031]
When the operation of the engine 1 continues and the temperature of the cooling water reaches about 80 ° C. or more, the encapsulant enclosed in the three-way valve 9 expands, and the three-way valve 9 is automatically moved in the direction of arrow b. The cooling water channel that circulates through the radiator 11 is selected by switching, and natural heat radiation is performed by the radiator 11.
[0032]
Furthermore, for example, if the temperature of the start of the operation of the blower 12 is set to 85 ° C. or higher, the temperature of the cooling water further increases, and when the temperature exceeds 85 ° C., this is The temperature is detected by the common control unit 17 based on the temperature signal from the temperature sensor 18, the blower 12 is turned on, the cooling water is cooled by the radiator 11 by forced air cooling in the blower 12, and circulated to the engine 1.
[0033]
Then, when hot water is supplied from the hot water supply pipe 14 and replenishment from the water supply pipe 13 is performed, heat recovery from the cooling water flowing through the heat supply pipe 19 of the water stored in the hot water tank 15 is increased. As a matter of course, the temperature on the outlet side of the heat supply pipe 19 is lowered, and the temperature signal detected by the temperature sensor 18 is also lower than 85 ° C., which is the operation start temperature of the blower 12. 17, when the blower 12 is turned off and the cooling water flowing through the three-way valve 9 also falls below 80 ° C., which is the operating temperature of the three-way valve 9, the three-way valve 9 is switched in the direction of arrow a. The heat dissipation in the radiator 11 of the cooling water is suppressed, and the temperature of the cooling water and the temperature of the water stored in the hot water tank 15 are maintained at a water temperature within a certain range, and the operation is performed.
[0034]
In this way, by providing the cooling water passage of the engine 1 as the heat supply pipe 19 to the outer wall of the hot water tank 15, the water heat exchanger 8 shown in FIG. 6 or the water on the secondary side of the water heat exchanger 8 is circulated. Since stable hot water supply can be performed without providing the circulating pump 16, the cost can be reduced, the power consumption of the circulating pump 16 can be reduced, and the power generation efficiency of the present cogeneration system can be improved.
[0035]
In addition, the configuration shown in FIG. 2 is also possible as a cogeneration system that suppresses the power consumed in the system as much as possible, improves the power generation efficiency, and also reduces the cost.
[0036]
As in FIG. 1, FIG. 2 also includes a control unit common to the power generation side and the heat recovery side, and by integrating them, the power consumed in the system is suppressed as much as possible, and the power generation efficiency is improved. FIG. 1 is a diagram showing an outline of an example of a cogeneration system that also suppresses costs. In FIG. 1, the cooling water channel is provided as the heat supply pipe 19 on the outer wall of the hot water tank 15, and heat is recovered from the circulating cooling water. However, in FIG. 2, the heat supply pipe 19 is provided to be submerged in the vicinity of the bottom of the water stored in the hot water tank 15.
[0037]
The heat supply pipe 19 may be a single pipe or a double pipe. In the case of a single pipe, heat recovery can be performed while preventing a decrease in thermal conductivity from the cooling water to the water stored in the hot water tank 15, so that the efficiency for heat supply can be improved. In the case where a double pipe is used, the efficiency of the heat supply is inferior to that of the single pipe, but if this heat supply pipe 19 is broken, the cooling water of the engine 1 is However, it is effective in terms of avoiding the danger of being stored in the hot water tank 15 and being mixed into the hot water to be supplied with hot water, and ensuring safety.
[0038]
The double pipe structure of the heat supply pipe 19 is, for example, a pipe in which an inner pipe 31 is provided inside the outer pipe 30 and in contact with the inner wall of the outer pipe 30 as shown in FIG. The outer tube 30 is a cylindrical tube that has not been specially processed, and the inner tube 31 is a tube that has been processed by providing a plurality of grooves on the outer wall in the extending direction of the tube. A space provided between the outer tube 30 and the inner tube 31 is a drainage channel 32.
[0039]
As a result, most of the heat from the cooling water flowing through the inner pipe 31 is transmitted to the outer pipe 30 and can be recovered to the water stored in the hot water tank 15 without reducing efficiency as much as possible. The outer pipe 30 is attached to the hot water tank 15, and the inner pipe 31 is connected to a cooling water passage extending from the engine 1, and a drainage passage 32 between the outer pipe 30 and the inner pipe 31 is provided. , It is opened on the outer wall of the hot water tank 15 to be opened to the outside air.
[0040]
This is because, in addition to ensuring the safety, when either the outer pipe 30 or the inner pipe 31 is damaged, either the water stored in the hot water tank 15 or the cooling water is damaged. The heat supply pipe 19 that has been submerged in the hot water tank 15 is damaged from the outside of the hot water tank 15. This is because it can be confirmed.
[0041]
In addition, since the apparatus and operation | movement which attached | subjected the same symbol as FIG. 1 are the same as the function demonstrated in the said FIG. 1, description is abbreviate | omitted.
[0042]
In the cogeneration system 101 of FIG. 2, the heat supply pipe 19 is submerged in the water stored in the hot water tank 15 in the heat recovery in the hot water tank 15 described in FIG. Since all the heat dissipated from the heat is recovered in the hot water tank 15, the heat insulating material of the hot water tank 15 can be simplified, and the cost can be further reduced.
[0043]
Further, FIG. 4 and FIG. 5 are schematic views of improvements made in the warm-up operation of the engine 1 of the embodiment described in FIGS. 1 and 2 above.
[0044]
In the embodiment described with reference to FIGS. 1 and 2, the cooling water channel of the engine 1 is a cooling water channel that performs a warm-up operation while recovering heat to the hot water tank 15 by the heat supply pipe 19, and in addition to this, a radiator 4 and FIG. 5 to be described later, in FIG. 4 and FIG. 5 to be described later, the cooling water passage is a cooling water passage dedicated to warm-up operation of the engine 1, heat recovery in the hot water tank 15, and It is configured as a cooling water channel that radiates heat in the radiator 11.
[0045]
In FIG. 4, a cooling water passage extending from the engine 1 is connected to a three-way valve 9, and a bypass cooling water passage that returns to the engine 1 without performing heat recovery and heat dissipation according to the temperature of the cooling water flowing through the three-way valve 9, and hot water supply A heat recovery pipe 19 provided as a heat recovery device on the outer wall of the tank 15 and a flow path for performing natural heat dissipation in the radiator 11 or forced cooling by receiving air from the blower 12 One of them is selected and circulated, and a cooling water passage that returns to the engine 1 through the cooling water pump 10 is configured.
[0046]
The three-way valve 9 used here is the same as that of the embodiment described with reference to FIGS. 1 and 2, but the operating temperature is different because the position provided on the cooling water channel is different.
[0047]
1 and 2, since it was provided on the cooling water channel that serves both as heat recovery and warm-up operation, the upper limit temperature of the cooling water is set to about 80 ° C. as described above. However, in FIGS. 4 and 5, since it is on the cooling water channel that performs only the warm-up operation of the engine 1, it is necessary to operate at a lower temperature. For example, the operating temperature of the three-way valve 9 is If the temperature of the circulating cooling water is less than about 60 ° C., the three-way valve 9 causes the cooling water to flow through the cooling water passage in the direction of arrow a, and the temperature of the cooling water is about 60 ° C. When the temperature exceeds 60 ° C., the three-way valve 9 switches the cooling water to the cooling water passage in the direction of the arrow b and causes the cooling water to circulate due to the expansion of the encapsulated sealing material.
[0048]
The blower 12 is a multistage speed-control blower, and sends a temperature signal detected by a temperature sensor 18 provided on a cooling water passage connecting the heat supply pipe 19 and the radiator 11 to the control unit 17. It is assumed that the wind speed is determined by a program built in the control unit 17 and the control unit 17 adjusts the wind speed.
[0049]
For example, when the temperature signal of the cooling water from the temperature sensor 18 is less than about 80 ° C., the control unit 17 selects the stop state and operates the blower 12, and the temperature signal from the temperature sensor 18 is If the temperature exceeds about 80 ° C., the control unit 17 selects the low speed operation. When the temperature signal exceeds about 85 ° C., the control unit 17 selects the medium speed operation. When the air blower 12 is operated and the temperature reaches around 90 ° C., the control unit 17 selects the high speed operation and operates the air blower 12.
[0050]
Thereby, since it becomes possible to adjust the air flow rate to the radiator 11 according to the temperature of the cooling water, the amount of heat radiation in the radiator 11 is adjusted, and the temperature of the cooling water is stabilized. It is possible to perform the heat recovery operation.
[0051]
When the operation of the cogeneration system 102 is started, an operation signal is output from the control unit 17 to the engine 1 as in FIGS. 1 and 2, and the fuel supplied from the fuel supply device 2 and the intake device The engine 1 starts operation by the mixed gas with the combustion air sucked in by the power generator 3, the power generator 6 is operated by the driving force, the power distribution device 7 receives the power generation from the power generator 6, and this is supplied to the commercial power source. In addition to the conversion to the frequency, the power supply to the home wiring is started in synchronization with the phase of the commercial power supply frequency.
[0052]
The control unit 17 operates the cooling water pump 10 simultaneously with the transmission of the operation signal to the engine 1 to circulate the cooling water into the cooling water channel. However, since the temperature of the cooling water is still low, the three-way valve 9 also The direction of arrow a is selected.
[0053]
For this reason, when the cooling water flows out of the engine 1, it flows through the three-way valve 9 in the direction of the arrow a, passes through the cooling water pump 10 and follows the cooling water path that returns to the engine 1 without heat dissipation and heat recovery. The engine 1 is warmed up.
[0054]
Here, the cooling water that has flowed out of the engine 1 is immediately returned to the engine 1 as described above, and heat dissipation in the radiator 11 is not performed, and of course, heat recovery in the heat supply pipe 19 is not performed. It is possible to perform warm-up operation in a short time without wasteful heat dissipation.
[0055]
When the operation of the engine 1 continues and the temperature of the cooling water reaches about 60 ° C. or higher, the encapsulant enclosed in the three-way valve 9 expands, assuming that the warm-up operation of the engine 1 is finished, The three-way valve 9 is automatically switched in the direction of arrow b, and the heat supply pipe 19 and the cooling water channel that circulates the radiator 11 are selected.
[0056]
The cooling water from the engine 1 flows into the heat supply pipe 19, and is radiated to the hot water tank 15 through the heat supply pipe 19, and heat recovery to the water stored in the hot water tank 15 is performed, so that the cooling The temperature of the water decreases and flows into the radiator 11.
[0057]
At this time, for example, even if the temperature of the cooling water detected at the position where the temperature sensor 18 is provided is not less than 60 ° C. at the time when the three-way valve 9 is circulated, When the temperature of the stored water is low, the amount of heat recovered in the hot water tank 15 is large. Therefore, the temperature of the cooling water after flowing through the heat supply pipe 19 decreases to the temperature of about 60 ° C. or less. Therefore, the blower 12 controlled by the control unit 17 remains in a stopped state, and the radiator 11 performs natural heat dissipation.
[0058]
When the temperature of the water stored in the hot water tank 15 rises as the temperature of the cooling water rises, and the amount of heat recovered from the cooling water in the hot water tank 15 decreases, the heat supply pipe 19 is The temperature of the circulating cooling water is less likely to decrease, and the temperature signal of the cooling water detected by the temperature sensor 18 also rises. When the temperature reaches about 80 ° C., the controller 17 operates the fan 12 at low speed. A signal is sent and forced cooling in the radiator 11 is started.
[0059]
Thereafter, when the temperature of the cooling water further rises to about 85 ° C. or higher, the operation signal sent from the control unit 17 to the blower 12 also becomes a medium speed operation signal, and the amount of air blown to the radiator 11 is This further increases the amount of heat dissipated in the radiator 11, and thus the temperature rise of the cooling water is suppressed.
[0060]
Of course, the temperature of the cooling water further increases. For example, when the temperature of the cooling water rises to about 90 ° C. or higher, the controller 17 operates the blower 12 according to the temperature signal from the temperature sensor 18. The high-speed operation is selected and instructed to perform further forced cooling in the radiator 11, and the temperature rise of the cooling water is suppressed.
[0061]
On the other hand, when the temperature of the water stored in the hot water tank 15 is lowered by performing hot water supply from the hot water supply pipe 14 and replenishment from the water supply pipe 13, it is natural that the hot water tank 15 Heat recovery from the cooling water flowing through the heat supply pipe 19 increases, the temperature of the cooling water flowing through the heat supply pipe 19 decreases, and the temperature signal detected by the temperature sensor 18 also decreases. When the cooling water temperature signal detected by the temperature sensor 18 causes the operation signal for operating the blower 12 from the control unit 17 to be an operation signal for reducing the wind speed, and when the temperature is lowered to the temperature of 60 ° C. or lower. The blower 12 is stopped, and the radiator 11 performs natural heat dissipation.
[0062]
In this way, the heat supply pipe 19 and the radiator 11 are connected in series on the cooling water channel, the temperature sensor 18 is provided on the cooling water channel, and the temperature of the cooling water is measured by the temperature sensor 18. The control unit 17 controls the wind speed of the blower 12 based on the detected temperature signal and adjusts the amount of heat released from the radiator 11 in multiple stages, whereby the temperature of the cooling water can be stabilized. It is possible to stabilize the temperature of the water stored in the hot water tank 15 for recovering heat from the water, that is, the hot water temperature.
[0063]
In addition, a cogeneration system 103 shown in FIG. 5 may be used as a cogeneration system that improves the rise at the start of operation and stabilizes the temperature of engine coolant.
[0064]
5 is omitted because the configuration and operation are the same as those shown in FIG. 4, but as in FIG. 2, the bottom of the water in which the heat supply pipe 19 that performs heat recovery is stored in the hot water tank 15. The difference is that it was submerged in the vicinity.
[0065]
In the present embodiment, the temperature detected by the temperature sensor 18 and the operating temperature of the three-way valve 9 have been described as one of the embodiments, and are not particularly limited to this temperature.
[0066]
Further, the blower 12 has been described as a multistage speed control type blower according to four stages of stop, low speed, medium speed, and high speed depending on the temperature of the cooling water. However, this is not limited to this, and more stages. A blower capable of speed adjustment or a blower that can be controlled steplessly from low speed to high speed, such as an inverter, or the temperature signal of the cooling water detected by the temperature sensor 18 is constantly monitored, and from the transition, the control unit 17 By using the control means for performing prediction and determining the wind speed, the temperature of the cooling water and the temperature of the hot water to be supplied can be further stabilized and the present cogeneration system can be operated.
[0067]
【The invention's effect】
As described above, by providing a cooling water passage for circulating cooling water of an internal combustion engine that generates power to the outer wall of the hot water tank or inside, and using this as a heat feeder, heat recovery is performed to the hot water tank. It is possible to delete the water heat exchanger that exchanges heat between the water stored in the cooling water and the circulating pump that circulates the water stored in the hot water tank to the water heat exchanger, It is possible to provide a cogeneration system that suppresses the power consumed in the system as much as possible, improves the power generation efficiency, and reduces the cost.
[0068]
In addition, a cooling water passage for warm-up operation of an internal combustion engine such as an engine, a cooling water passage for heat recovery and heat dissipation, and the speed of the blower that blows air to the radiator is controlled in multiple stages depending on the temperature of the cooling water. In addition, the warm-up operation of the internal combustion engine can be completed in a short time, and the temperature of the cooling water can be further stabilized, and heat is recovered from the cooling water having a stable temperature and supplied. Hot water can be supplied while stabilizing the temperature.
[0069]
Furthermore, by providing a common control unit on the power generation side and the heat recovery side and integrating them, it is possible to check at one place of this common control unit even after confirmation and maintenance after construction. Can also be improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of a cogeneration system in which power consumed in a system is suppressed as much as possible, power generation efficiency is improved, and cost is also suppressed.
2 is a schematic view in which a heat supply pipe 19 of FIG. 1 is provided in a hot water tank 15. FIG.
3 is a schematic view showing a cross section of a heat supply pipe 19 provided in the vicinity of the bottom in the hot water tank 15. FIG.
FIG. 4 is a diagram showing an outline of a cogeneration system in which the warm-up operation time of the engine 1 is shortened and the temperature of cooling water is stabilized.
5 is a schematic view in which the heat supply pipe 19 of FIG. 4 is provided in the hot water tank 15. FIG.
FIG. 6 is a schematic diagram showing a configuration in a conventional cogeneration system.
[Explanation of symbols]
1 engine
6 Generator
8 Water heat exchanger
9 Three-way valve
10 Cooling water pump
15 Hot water tank
16 Circulation pump
17 Common control unit
18 Temperature sensor
19 Heat supply pipe
22 First three-way valve
23 Second three-way valve
24a, b Heat receiving piping
25 Power generation control unit
26 Heat recovery controller
110 Power generation system
111 Heat recovery system

Claims (6)

In a cogeneration system in which cooling water of an internal combustion engine is circulated by a cooling water pump and hot water is stored in a hot water tank by the heat of the cooling water, the cooling water path through which the cooling water circulates is an outer wall of the hot water tank or the hot water supply A cooling water passage disposed inside the tank and circulated by the cooling water pump of the cooling water and at the outer wall of the hot water tank or inside the hot water tank when the internal combustion engine is warmed up. A cogeneration system comprising a bypass cooling water channel that bypasses and circulates the cooling water . The cogeneration system according to claim 1, wherein the cooling water channel provided on the outer wall of the hot water tank is provided at least in a portion centering on the outer wall near the bottom of the hot water tank. 2. The cogeneration system according to claim 1, wherein the cooling water channel provided in the hot water tank is submerged in water stored in the hot water tank and provided near a bottom portion in the hot water tank. The cooling water channel provided near the bottom in the hot water tank is a double pipe, and a space between the outer pipe and the inner pipe of the double pipe is opened on the outer wall of the hot water tank. Item 4. The cogeneration system according to item 1 or 3. The control unit for controlling the internal combustion engine, the cooling water pump, and the hot water tank is provided, and the internal combustion engine, the cooling water pump, and the hot water tank are integrated. The cogeneration system according to any one of 1 to 4. A radiator that dissipates heat that cannot be recovered in the hot water tank is provided on the cooling water channel, and further, a fan of either a multistage speed control type or a continuously variable speed control type is provided to the heat sink, and the cooling The cogeneration system according to claim 5, wherein the blower amount of the blower is controlled by the temperature of the cooling water flowing through the water channel .

Images