JP2003254611A - Cogeneration system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cogeneration system characterized in suppressing a power consumed in the cogeneration system as much as possible, improving the power generation efficiency, and suppressing the cost by integrally providing a control part used in common between a power generation side and a heat recovery side. <P>SOLUTION: A power generation system and a heat recovery system are integrated together, the control part being in common between the power generation system and the heat recovery system is provided, and a heat supply pipe 19 is provided in the external wall of a hot water supply tank 15. Cooling water for an engine 1 is made to pass through the heat supply pipe 19 to supply heat to the hot water supply tank 15. This constitution dispenses with a water heat exchanger and a circulating pump circulating the water for receiving/ supplying the heat to the secondary side of the water heat exchanger so as to reduce the cost, to reduce the power consumed in this cogeneration system, and to improve the power generation efficiency. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-sized cogeneration system for generating electricity and supplying hot water.

[0002]

2. Description of the Related Art A cogeneration system operates a generator by the driving force of an internal combustion engine such as an engine to generate electricity and recover heat from cooling water of the internal combustion engine and exhaust gas.
It is common to generate hot water or steam to supply heat for hot water supply or air conditioning.

When fuel is burned to generate electricity and supply hot water, as shown in FIG.
The heat recovery side 111 and the power generation side 110
Is provided to the cooling water passage extending from the engine 1, one of which is a cooling water passage that returns to the engine 1 via the cooling water pump 10, and the other is water heat exchange. The second three-way valve 23 is provided at the end of the cooling water passage extending from the outlet of the water heat exchanger 8 connected to the primary side of the water cooler 8 and one of which is returned to the engine 1 via the cooling water pump 10. The water channel is used as the water channel, and the other side is configured as a cooling water channel that flows through the radiator 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. When the temperature is low, the solid arrow d
When the temperature of the cooling water reaches a temperature that can be used for heat recovery to hot water supply, the water heat exchanger 8 indicated by a broken line arrow e Of the cooling water passage through which the cooling water is circulated to the primary side of the cooling water is performed to recover heat, and the temperature of the cooling water further rises, and the temperature of the cooling water is recovered even after the heat recovery in the water heat exchanger 8. Does not decrease to a temperature at which the engine 1 can be cooled, a cooling water passage for circulating the cooling water to the primary side of the water heat exchanger 8 and the radiator 11 is selected as indicated by a dashed-dotted arrow f. The blower 12 is operated from the power generation control unit 25 by a temperature signal from a cooling water temperature sensor (not shown) to perform cooling by the radiator 11, and operation is performed while stabilizing the temperature of the cooling water to recover the heat. The heat was being recovered to the side.

A heat recovery control unit 26 for controlling the heat recovery side 111 is provided, and the water supply pipe 13 and the hot water supply pipe 14 are provided.
A hot water supply tank 15 is provided, and further, heat receiving piping for drawing water from near the bottom of the water stored in the hot water supply tank 15 and circulating it to the secondary side of the water heat exchanger 8 using a circulation pump 16. The heat recovery controller 2 is provided with 24a and 24b, and the temperature signal from the temperature sensor 27 provided in the hot water supply tank 15 is used.
The circulation pump 16 was operated from 6 and the heat was recovered from the cooling water of the engine 1 on the power generation side 110 via the water heat exchanger 8 and stored in the hot water supply tank 15 to supply hot water.

Here, a device other than the above shown in FIG. 6 will be described. Reference numeral 2 is a fuel supply device for supplying the fuel of the engine 1, 3 is an intake device for sucking combustion air, and 4 is the fuel. A mixer for mixing the combustion air and the combustion air to generate a mixed gas, and an exhaust device 5 for exhausting the combustion gas burned in the engine 1.

Reference numeral 6 is a generator driven by the driving force generated by combustion of the engine 1, and 7 is a converter for converting the generated power into a commercial power frequency and synchronizing the power with the commercial power frequency. A power supply device 12 supplies air to the radiator 11.

Further, when a cogeneration system is installed, the power generation side and the hot water supply side are constructed independently of each other. Therefore, as shown in FIG. Was being controlled.

[0008]

However, when considering a small-sized cogeneration system for home use as well, a circulation pump for recovering heat from the hot water stored in the hot water supply tank is not available. Although it is about several hundreds of watts, the engine is also small and the amount of power generation is naturally about several kilowatts. Therefore, the power consumption for operation against the amount of power generated by this cogeneration system As a result, the ratio occupied by the amount increases, resulting in a decrease in the final power generation efficiency.

[0009] Further, by mounting the circulation pump and the water heat exchanger, the cost is naturally increased.

Therefore, in this small cogeneration system, it has been demanded to reduce the power consumption consumed in the system and the cost.

An object of the present invention is to provide a control unit common to both the power generation side and the heat recovery side and integrate them to suppress the electric power consumed in the cogeneration system as much as possible.
An object of the present invention is to provide a cogeneration system characterized by improving power generation efficiency and reducing costs.

[0012]

According to a first aspect of the present invention, cooling water for an internal combustion engine is circulated by a cooling water pump,
In a cogeneration system in which hot water is stored in a hot water supply tank by the heat of the cooling water, a cooling water passage in which the cooling water circulates is disposed on an outer wall of the hot water supply tank or inside the hot water supply tank, and the cooling water is It is characterized in that it is circulated by a cooling water pump.

According to a second aspect of the present invention, in the first aspect, the cooling water passage provided on the outer wall of the hot water supply tank is provided at least at a portion centered on the outer wall near the bottom of the hot water supply tank. It is characterized by that.

According to a third aspect of the present invention, in the first aspect, the cooling water passage provided inside the hot water supply tank is immersed in the water stored in the hot water supply tank to supply the hot water. It is characterized in that it is provided near the bottom of the tank.

According to a fourth aspect of the present invention, in the first or third aspect, the cooling water passage provided near the bottom of the hot water supply tank is a double pipe, and the outer pipe and the inner pipe of the double pipe are inside. The space between the pipe and the pipe is opened to the outer wall of the hot water supply tank.

The invention according to a fifth aspect is the first to the fourth aspects.
In any one of the above items, a control unit that controls the internal combustion engine, the cooling water pump, and the hot water supply tank is provided, and the internal combustion engine, the cooling water pump, and the hot water supply tank are integrated. It is characterized by that.

The invention according to claim 6 is the same as claims 1 to 5.
In any one of the above, by-pass cooling that circulates the cooling water by bypassing an outer wall of the hot water supply tank or a cooling water passage arranged inside the hot water supply tank during warm-up operation of the internal combustion engine. It is characterized by having a waterway.

According to a seventh aspect of the present invention, in the sixth aspect, a radiator is provided on the cooling water passage for radiating heat that cannot be completely recovered in the hot water supply tank, and the radiator has a multi-stage structure. It is characterized in that either a speed control type fan or a stepless speed control type fan is provided, and the amount of air blown by the fan is controlled by the temperature of the cooling water flowing through the cooling water passage.

[0019]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to FIGS.

With reference to FIG. 1, FIG.
By providing and integrating a control unit common to both the power generation side and the heat recovery side, the power consumed in the cogeneration system is suppressed as much as possible, the power generation efficiency is improved, and the cost of the cogeneration system is reduced. It is the figure which showed the outline about an example.

First, the structure of the cogeneration system 100 will be described. The engine 1 takes in the fuel sucked by the fuel supply device 2 and the intake device 3 and the combustion air through the mixer 4 and burns them. The combustion gas is discharged through the exhaust device 5, the driving force of the engine 1 generated at this time drives the generator 6, and the power is supplied via the power distribution device 7.

A cooling water passage for circulating cooling water for cooling the engine 1 extends from the engine 1 and is provided as a heat supply pipe 19 on the outer wall of the hot water supply tank 15. From the heat supply pipe 19 to the three-way valve 9. Connected and branched in two directions, one flows in the direction of arrow a and returns to the engine 1 via the cooling water pump 10, and the other flows in the direction of arrow b,
It is composed of a flow path that returns to the engine 1 via the radiator 11 and the cooling water pump 10, and the radiator 11 receives the air from the blower 12 and completely recovers heat in the heat supply pipe 19. Instead, the remaining heat of the cooling water that has fallen to a predetermined temperature and cannot be exhausted is released to the atmosphere.

The three-way valve 9 used here is filled with an encapsulant such as oil or wax, and the volume of the encapsulant changes automatically depending on the temperature of the circulating cooling water.
In a mechanical flow control valve that selects a flow path in either the arrow a direction or the arrow b direction, for example, when the operating temperature of the three-way valve 9 is about 80 ° C., the temperature of the circulating cooling water is If the temperature is lower than 80 ° C., the three-way valve 9 causes the cooling water to flow to the cooling water passage 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 arrow b. It is distributed to the cooling water channel in the direction.

In the hot water supply tank 15, the warm water that has been warmed up stays in the upper part, so that the heat supply pipe 19 is provided centering on the lower part of the outer wall of the hot water supply tank 15, and the heat insulation is performed sufficiently from the outside. It has been Since the heat supply pipe 19 is provided on the outer wall of the hot water supply tank 15 as described above, heat is also radiated into the hot water supply tank 15, but heat is also radiated toward the outside of the hot water supply tank 15. This is because the heat recovery efficiency may be reduced.

The hot water supply tank 15 is provided with a water supply pipe 13 that is opened near the bottom of the inside to replenish the stored water, and a hot water supply pipe 14 that draws water from the upper portion of the stored water to supply hot water. Is provided. Further, this hot water supply tank 15 is an airtight container, and when hot water is supplied from the hot water supply pipe 14, the inside of the hot water supply tank 15 has a negative pressure, and the amount of hot water supplied is supplied from the water supply pipe 13. Because
The amount of water stored in the hot water supply tank 15 is always constant.

Further, a temperature sensor 18 is provided on a cooling water passage connected from the heat supply pipe 19 to the three-way valve 9, and a cooling water pump is installed by a program incorporated in a common control unit 17 which controls the cogeneration system 100. 10
Also, the blower 12 and the like are turned on and off.

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, and the fuel supplied from the fuel supply device 2 and the intake device 3 are sucked. The combustion air is mixed with the mixer 4, and the mixed gas is sucked and combusted to start the operation of the engine 1. The driving force of the engine 1 drives the power generation device 6, and the power distribution device 7 operates the power from the generator 6. It receives power generation, converts it to a commercial power supply frequency, tunes it to the phase of the commercial power supply frequency, and starts power supply to the household wiring.

The common control unit 17 operates the cooling water pump 10 and circulates the cooling water in the cooling water passage simultaneously with the transmission of the operation signal to the engine 1. However, since the temperature of the cooling water is still low, The blower 12 remains stopped, and the three-way valve 9 is also selected in the arrow a direction.

Therefore, when the cooling water flows out from the engine 1, the cooling water flows through the heat supply pipe 19 and the three-way valve 9 is moved to the arrow a.
The engine 1 is warmed up by following the cooling water passage that flows in the direction, passes through the cooling water pump 10 and returns to the engine 1.

At this time, since the cooling water is warmed up while the heat is recovered in the hot water supply tank 15 when passing through the heat supply pipe 19, the temperature of the cooling water during the warming up operation of the engine 1 is increased. Although the temperature of the cooling water rises slowly, the temperature of the water stored in the hot water supply tank 15 rises at the same time as the temperature of the cooling water rises. Therefore, the cooling water of the engine 1 shown in FIG. After the temperature rises, the circulation pump 16 is operated to start supplying heat to the hot water supply tank 15, and then the hot water supply tank 15
There is no time delay that the temperature of the water stored inside rises.

Then, when the operation of the engine 1 is continued and the temperature of the cooling water reaches about 80 ° C. or higher, the encapsulating material enclosed in the three-way valve 9 expands, and the three-way valve 9 is automatically moved to the arrow direction. By switching to the b direction, a cooling water passage that circulates the radiator 11 is selected, and the radiator 11 radiates natural heat.

Further, for example, when the temperature at which the blower 12 is started to operate is such that the temperature of the cooling water is 85 ° C. or higher, the temperature of the cooling water further rises, and when the temperature exceeds 85 ° C. This is detected by the common control unit 17 by 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 by the blower 12, and is circulated to the engine 1. .

Hot water is supplied from the hot water supply pipe 14,
Hot water supply tank 1
When the heat recovery from the cooling water flowing through the heat supply pipe 19 of the water stored in 5 increases, the temperature at the outlet side of the heat supply pipe 19 naturally decreases, and the temperature sensor 18 Since the detected temperature signal also falls below the operation start temperature of the blower 12, which is 85 ° C., the common control unit 17 turns off the blower 12, and the cooling water flowing through the three-way valve 9 also has the three-way valve 9 described above. When the operating temperature is lower than 80 ° C., the three-way valve 9 is switched to the direction of the arrow a, the heat radiation of the cooling water in the radiator 11 is suppressed, and the temperature of the cooling water and the hot water supply tank are reduced. The temperature of the water stored in 15 is maintained at a water temperature within a certain range and the operation is performed.

In this way, the heat supply pipe 19 is attached to the outer wall of the hot water supply tank 15.
As a result, by providing the cooling water passage for the engine 1, stable hot water supply can be performed without providing the water heat exchanger 8 shown in FIG. 6 and the circulation pump 16 for circulating the water on the secondary side of the water heat exchanger 8. Therefore, the cost can be reduced, the power consumption of the circulation pump 16 can be reduced, and the power generation efficiency of the cogeneration system can be improved.

In addition to the above, as the cogeneration system in which the electric power consumed in the system is suppressed as much as possible to improve the power generation efficiency and the cost is also suppressed, the configuration shown in FIG. 2 is also possible.

In FIG. 2 as well, as in the case of FIG. 1, by providing a control unit common to the power generation side and the heat recovery side and 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 reduces costs. In FIG. 1, the cooling water passage is used as the heat supply pipe 19 in the hot water tank 15.
The heat supply pipe 19 is provided in the outer wall of the hot water supply tank 15 in FIG.
It is installed submerged near the bottom of the water stored inside.

The heat supply pipe 19 may be either a single pipe or a double pipe. This is because when a single pipe is used, it is possible to prevent a decrease in the thermal conductivity from the cooling water to the water stored in the hot water supply tank 15 and to perform heat recovery, so that the efficiency of heat supply is improved. It is effective in improving,
In the case of a double pipe, the efficiency of heat supply is inferior to that of the single pipe, but in the unlikely event that the heat supply pipe 19 is damaged, the cooling water of the engine 1 is stored in the hot water supply tank 15, This is effective in avoiding the risk of mixing with hot water to be supplied and ensuring safety.

The double pipe structure of the heat supply pipe 19 is
For example, as shown in FIG. 3, an inner tube 31 is provided inside the outer tube 30 so as to be in contact with the inner wall of the outer tube 30, and the outer tube 30 is a cylinder that is not specially processed. The inner pipe 31 is a pipe having a shape in which a plurality of grooves are formed on the outer wall in the extension direction of the pipe, and the inner pipe 31 is provided between the outer pipe 30 and the inner pipe 31. The open space is the drainage channel 32.

As a result, most of the heat from the cooling water flowing through the inner pipe 31 is transferred to the outer pipe 30, and the hot water supply tank 1
The heat stored in the water 5 can be recovered without reducing the efficiency as much as possible, and the outer pipe 30 is the hot water supply tank 15
The inner pipe 31 is connected to a cooling water passage extending from the engine 1, and the drainage passage 32 between the outer pipe 30 and the inner pipe 31 is opened on the outer wall of the hot water supply tank 15. It is opened to the outside air.

In addition to ensuring the above safety, the outer tube 3
When 0 or any of the inner pipes 31 is damaged, either the water stored in the hot water supply tank 15 or the cooling water flows out from the damaged part and flows through the drainage channel 32. Since the water flows out to the outer wall of the hot water supply tank 15, damage to the heat supply pipe 19 submerged in the hot water supply tank 15 can be confirmed from the outside of the hot water supply tank 15.

Other than that, the apparatus and the operation which are given the same symbols as in FIG. 1 are the same as the functions explained in FIG.

In the heat generation in the hot water supply tank 15 described with reference to FIG. 1, in the cogeneration system 101 of FIG. 2, the heat supply pipe 19 is provided by being submerged in the water stored in the hot water supply tank 15. Since all the heat radiated from the supply pipe 19 is recovered into the hot water supply tank 15, the heat insulating material of the hot water supply tank 15 can be simplified.
Further cost reduction can be achieved.

Further, FIGS. 4 and 5 are schematic diagrams of improvements made to the warm-up operation of the engine 1 of the embodiment described with reference to FIGS. 1 and 2 above.

In the embodiment described with reference to FIGS. 1 and 2, the cooling water passage of the engine 1 is connected to the hot water supply tank 1 by the heat supply pipe 19.
Although a cooling water channel for performing a warm-up operation while performing heat recovery to 5 and a cooling water channel for radiating heat in the radiator 11 are provided, the cooling water channel is described in FIG. 4 and FIG. 5 described later. The water channels are configured by a cooling water channel dedicated to the warm-up operation of the engine 1 and a cooling water channel for performing heat recovery in the hot water supply tank 15 and heat dissipation in the radiator 11.

In FIG. 4, the cooling water passage extending from the engine 1 is connected to the three-way valve 9, and depending on the temperature of the cooling water flowing through this three-way valve 9, the bypass cooling water passage for returning to the engine 1 without heat recovery and heat radiation. And heat recovery in a heat supply pipe 19 provided as a heat recovery device on the outer wall of the hot water supply tank 15, and
Cooling returning to the engine 1 via the cooling water pump 10 by selecting and distributing either natural heat dissipation in the radiator 11 or a flow path for performing forced cooling by receiving air blown from the blower 12. It is composed of a waterway.

The three-way valve 9 used here is the same as that of the embodiment described with reference to FIGS. 1 and 2, but its operating temperature is different because the position provided on the cooling water passage is different. different.

In FIGS. 1 and 2, since the cooling water is provided on the cooling water passage for both heat recovery and warm-up operation, the upper limit temperature of the cooling water is set to about 80 ° C. as described above.
As described above, in FIGS. 4 and 5, it is necessary to operate the engine 1 at a lower temperature because it is on the cooling water channel that performs only the warm-up operation of the engine 1. Explaining the operating temperature as about 60 ° C., 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 to the cooling water passage in the direction of arrow a,
When the temperature of the cooling water exceeds approximately 60 ° C., the three-way valve 9 causes the cooling water to flow through the arrow b due to the expansion of the enclosed sealing material.
The cooling water is switched to the direction, and the cooling water is circulated.

The blower 12 is a multi-stage speed control type blower, and controls the temperature signal detected by the temperature sensor 18 provided on the 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 speed adjustment is performed by the control unit 17.

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 to operate the blower 12, and if the temperature signal from the temperature sensor 18 exceeds about 80 ° C., the control unit 17 selects the low speed operation, and the temperature signal is When the temperature exceeds about 85 ° C, the control unit 17
Is to operate the blower 12 by selecting the medium speed operation, and when the temperature reaches around 90 ° C., the control unit 17 selects the high speed operation to operate the blower 12.

As a result, the amount of air blown to the radiator 11 can be adjusted according to the temperature of the cooling water. Therefore, the amount of heat released by the radiator 11 can be adjusted to control the temperature of the cooling water. It is possible to perform the heat recovery operation while stabilizing.

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. , Intake device 3
The engine 1 starts to operate due to the mixed gas with the combustion air that has been sucked in by the engine, the driving force drives the power generation device 6, and the power distribution device 7 receives power generation from the power generator 6, Then, the power is supplied to the household wiring in tune with the phase of the commercial power supply frequency.

At the same time as the operation signal is sent to the engine 1, the control unit 17 operates the cooling water pump 10 to circulate the cooling water in the cooling water passage. However, since the temperature of the cooling water is still low, The valve 9 is also selected in the arrow a direction.

Therefore, when the cooling water flows out from the engine 1, the cooling water flows through the three-way valve 9 in the direction of the arrow a, passes through the cooling water pump 10, and dissipates heat and returns to the engine 1 without being recovered. Following this, the engine 1 is warmed up.

Here, the cooling water flowing out from the engine 1 is immediately returned to the engine 1 as it is, as described above, and the heat is dissipated by the radiator 11 and the heat is recovered by the heat supply pipe 19. Since there is no unnecessary heat dissipation, the warm-up operation can be performed in a short time.

When the operation of the engine 1 is continued and the temperature of the cooling water reaches about 60 ° C. or higher, it is considered that the warm-up operation of the engine 1 has ended, and the encapsulating material enclosed in the three-way valve 9 is removed. When expanded, the three-way valve 9 is automatically switched in the direction of arrow b, and the cooling water passage that circulates through the heat supply pipe 19 and the radiator 11 is selected.

The cooling water from the engine 1 flows into the heat supply pipe 19 and is radiated to the hot water supply tank 15 by the heat supply pipe 19 to recover heat to the water stored in the hot water supply tank 15. The temperature of the cooling water drops and flows into the radiator 11.

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 60 ° C. or more at the time of flowing through the three-way valve 9, hot water supply is performed. When the temperature of the water stored in the tank 15 is low, the amount of heat recovered in the hot water supply tank 15 is large, so the temperature of the cooling water after flowing through the heat supply pipe 19 is
The temperature drops to about 60 ° C. or less, and the control unit 1
The blower 12 controlled by 7 remains in the stopped state, and the radiator 11 radiates natural heat.

As the temperature of the cooling water rises,
When the temperature of the water stored in the hot water supply tank 15 rises and the amount of heat recovered from the cooling water in the hot water supply tank 15 decreases, the temperature of the cooling water flowing through the heat supply pipe 19 decreases. It becomes difficult to do so, the temperature signal of the cooling water detected by the temperature sensor 18 also rises, and when it reaches about 80 ° C., an operation signal at low speed operation is sent from the control unit 17 to the blower 12,
Forced cooling by the radiator 11 is started.

After that, when the temperature of the cooling water further rises to the temperature of about 85 ° C. or higher, the operation signal sent from the control unit 17 to the blower 12 also becomes the medium speed operation signal and is sent to the radiator 11. Since the air volume further increases and the heat radiation amount in the radiator 11 also increases, the temperature rise of the cooling water is suppressed.

Of course, if the temperature of the cooling water rises above this level, for example, if the temperature of the cooling water rises above about 90 ° C., the control unit 17 causes the blower to send a temperature signal from the temperature sensor 18. The high speed operation is selected and instructed for the operation of No. 12, the radiator 11 is further forcedly cooled, and the temperature rise of the cooling water is suppressed.

On the other hand, when the temperature of the water stored in the hot water supply tank 15 is lowered by supplying hot water from the hot water supply pipe 14 and replenishing the water from the water supply pipe 13, naturally Heat recovery from the cooling water flowing through the heat supply pipe 19 in the tank 15 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. Therefore, due to the temperature signal of the cooling water detected by the temperature sensor 18, the operation signal from the control unit 17 for operating the blower 12 also becomes an operation signal with a reduced wind speed, and the temperature has dropped to 60 ° C. or lower. In this case, the blower 12 is stopped and the radiator 11 is
Natural heat dissipation will be performed.

As described above, the heat supply pipe 19 and the radiator 11 are provided in series on the cooling water passage, and the temperature sensor 18 is provided on the cooling water passage. The control unit 17 uses the temperature signal detected by the sensor 18.
The temperature of the cooling water can be stabilized by controlling the wind speed of the blower 12 and adjusting the amount of heat radiated by the radiator 11 in multiple stages, and a hot water supply tank for recovering heat from this cooling water It is possible to stabilize the temperature of the water stored in 15, that is, the hot water supply temperature.

In addition to the above, a cogeneration system 103 shown in FIG. 5 can be used as a cogeneration system that improves the startup at the start of operation and stabilizes the temperature of the engine cooling water.

FIG. 5 shows the configuration and driving operation.
Since it is the same as that shown in FIG. 4, the description thereof will be omitted. However, as in FIG. 2, a heat supply pipe 19 for recovering heat is different in that it is submerged near the bottom of the water stored in the hot water supply tank 15. Is.

In this 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. There is no.

Further, although the blower 12 is a multi-stage speed control type blower and has been described in four stages of stop, low speed, medium speed and high speed according to the temperature of the cooling water, this is not particularly limited. , A blower capable of more multi-stage speed control, or a blower capable of continuously controlling from low speed to high speed such as an inverter, or constantly monitoring the temperature signal of the cooling water detected by the temperature sensor 18 and controlling from the transition thereof By using the control means for making the prediction in the section 17 and determining the wind speed, it becomes possible to further stabilize the temperature of the cooling water and the temperature of the hot water to be supplied to operate the cogeneration system. .

[0067]

According to the above description, a cooling water passage for circulating cooling water of an internal combustion engine for generating electric power is provided to the outer wall of the hot water supply tank or inside, and heat is recovered in the hot water supply tank as a heat supplier. The water stored in the hot water supply tank and a water heat exchanger for exchanging heat with the cooling water, and
It is also possible to remove the circulation pump that circulates the water stored in the hot water supply tank to the water heat exchanger, which minimizes the electric power consumed in the system to improve the power generation efficiency and reduce the cost. It is possible to provide the cogeneration system.

A cooling water passage for warming up an internal combustion engine such as an engine and a cooling water passage for heat recovery and heat radiation,
By controlling the speed of the blower that blows air to the radiator in multiple stages depending on the temperature of the cooling water, 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. Therefore, it is possible to recover heat from the cooling water whose temperature is stable and stabilize the temperature of the supplied hot water to supply hot water.

Further, by providing a control unit common to the power generation side and the heat recovery side and integrating them, it is possible to perform confirmation at one place of this common control unit even after confirmation and maintenance after construction. It is possible to improve workability.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a cogeneration system in which electric power consumed in the system is suppressed as much as possible, power generation efficiency is improved, and cost is also suppressed.

FIG. 2 is a schematic diagram in which a heat supply pipe 19 of FIG. 1 is provided in a hot water supply tank 15.

FIG. 3 is a schematic view showing a cross section of a heat supply pipe 19 provided near the bottom of the hot water supply tank 15.

FIG. 4 is a diagram schematically showing a cogeneration system in which the warm-up time of the engine 1 is shortened and the temperature of cooling water is stabilized.

5 is a schematic diagram in which the heat supply pipe 19 of FIG. 4 is provided in the hot water supply tank 15. FIG.

FIG. 6 is a schematic diagram showing a configuration of 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 supply 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 pipe 25 Power generation control unit 26 Heat recovery control unit 110 power generation system 111 heat recovery system

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tomio Mogi             1 Otsuki-cho, Ashikaga City, Tochigi Prefecture Sanyo Electric Air Conditioning             Within the corporation (72) Inventor Kazuo Nomura             1 Otsuki-cho, Ashikaga City, Tochigi Prefecture Sanyo Electric Air Conditioning             Within the corporation (72) Inventor Kuniue Sekigami             1 Otsuki-cho, Ashikaga City, Tochigi Prefecture Sanyo Electric Air Conditioning             Within the corporation (72) Inventor Hisashi Tokizaki             1 Otsuki-cho, Ashikaga City, Tochigi Prefecture Sanyo Electric Air Conditioning             Within the corporation F-term (reference) 3H021 BA06 CA06 DA03

Claims (7)

[Claims] 1. A cogeneration system in which cooling water for an internal combustion engine is circulated by a cooling water pump and hot water is stored in a hot water supply tank by the heat of the cooling water, wherein a cooling water channel in which the cooling water circulates is an outer wall of the hot water supply tank. Alternatively, the cogeneration system is arranged inside the hot water supply tank and circulates the cooling water by the cooling water pump. 2. The cogeneration system according to claim 1, wherein the cooling water passage provided on the outer wall of the hot water supply tank is provided at least at a portion around the outer wall near the bottom of the hot water supply tank. 3. The cooling water passage provided inside the hot water supply tank is submerged in the water stored in the hot water supply tank, and is provided near the bottom of the hot water supply tank. Cogeneration system. 4. The cooling water passage provided near the bottom of the hot water supply tank is a double pipe, and the space between the outer pipe and the inner pipe of the double pipe is opened to the outer wall of the hot water supply tank. The cogeneration system according to claim 1 or 3, wherein. 5. The internal combustion engine, the cooling water pump,
The cogeneration system according to any one of claims 1 to 4, wherein a control unit that controls the hot water supply tank is provided, and the internal combustion engine, the cooling water pump, and the hot water supply tank are integrated. system. 6. A bypass cooling water passage that circulates the cooling water is provided by bypassing a cooling water passage provided in the outer wall of the hot water supply tank or inside the hot water supply tank during warm-up operation of the internal combustion engine. The cogeneration system according to any one of claims 1 to 5, characterized in that: 7. A radiator for radiating heat that cannot be completely recovered in the hot water supply tank is provided on the cooling water passage, and further, a multistage speed control type fan or a stepless speed control type fan is provided to the radiator. 7. The cogeneration system according to claim 6, further comprising: an air conditioner for controlling the amount of air blown by the blower according to the temperature of the cooling water flowing through the cooling water passage.