JPH05187317A - Heat and electricity supplying device - Google Patents

Abstract

PURPOSE:To secure heat supply ability of a heat and electricity supplying device even when electric power consumption is small. CONSTITUTION:An exhaust valve 50 is provided on the exhaust pipe 21 of an engine 20. The opening degree of the exhaust pipe 21 is reduced by the exhaust valve 50 when temperature detected by a water temperature sensor 63 or a tank water temperature sensor 64 is low. As the opening degree of the exhaust valve 21 is decreased, the exhaust back pressure of the engine 20 is increased and therefore the heat generation of the engine 20 is increased. Since this increases the heating ability of a water heating circuit 40 using a liquid-liquid heat exchanger 33, hot water supply ability is secured even when electric power consumption is small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined heat and power supply device for supplying electric power and heat.

[0002]

2. Description of the Related Art In a combined heat and power supply system in which a generator drives an engine to supply electric power, and at the same time waste heat of the engine is used to supply heat such as hot water, stable power supply is the main focus. Therefore, the engine is driven according to the power consumption. Therefore, the amount of heat supply depends on the amount of power consumption, and the greater the amount of power consumption, the greater the amount of waste heat that can be obtained.For example, in the case where hot water is supplied from the engine waste heat, the amount of waste heat according to the amount of hot water required is Not always available,
The lower the power consumption, the more likely the hot water supply capacity is insufficient. Therefore, in order to obtain sufficient heat supply capacity even when the power consumption is low, a hot water storage tank is provided to heat water when the heat supply capacity is surplus and store it as hot water, and to release the heat of the hot water when insufficient. There are those that perform additional heating with an auxiliary boiler, or those that are provided with an electric heater that additionally heats water by surplus power, as seen in Japanese Patent Laid-Open No. 1-296042.

[0003]

However, in all of the above, when the power consumption is low and the engine waste heat is small, heat is supplied by a device or the like provided separately from the engine. As a result, the operating rate of the engine remains low, the amount of heat generated by the engine is small, and the engine cannot be fully utilized as a heat source.

An object of the present invention is to provide a large heat supply capacity by an engine in a combined heat and power supply device in which a generator is driven by the engine, even when the power consumption is small.

[0005]

The present invention provides a generator for supplying electric power, an engine for driving the generator according to its load, and heat recovery means for recovering heat generated by the engine. A combined heat and power supply device comprising a fluid heating means for heating a fluid by the heat recovered by the heat recovery means,
An on-off valve for changing the cross-sectional area of the passage is arranged in the exhaust passage of the engine, and a temperature detecting means for detecting the temperature of the fluid heated by the fluid heating means is provided and detected by the temperature detecting means. The technical means is to control the opening / closing valve according to the fluid temperature. Further, the on-off valve is a plurality of butterfly valves each having a through-hole having a different throttle ratio with respect to the exhaust passage, and the on-off valve detects the load amount of the generator by the power load detection means. It is effective to control the plurality of butterfly valves according to the load amount.

[0006]

In the present invention, the on-off valve for changing the cross-sectional area is arranged in the exhaust passage of the engine. When the cross-sectional area of the exhaust passage is reduced by the on-off valve, the exhaust back pressure of the engine rises, Increase the internal load of. At this time, in the engine, a large driving force is required to maintain the rotation of the generator driven according to the load, and therefore the fuel is increased. As a result, the amount of heat generated by the operation of the engine increases. Therefore, if the on-off valve is closed when the fluid temperature is low, the heat generation amount of the engine can be increased. Therefore, even if the heat generation amount of the engine is small due to the small power consumption, the heat recovery means recovers the heat. Can be increased and the fluid temperature can be increased. According to the second aspect of the present invention, since the throttle ratio of the exhaust passage can be changed according to the detected electric power load, the exhaust back pressure of the engine can be adjusted stepwise.

[0007]

According to the present invention, the heat generation amount of the engine can be increased by reducing the cross-sectional area of the exhaust passage by the opening / closing valve in the exhaust passage of the engine. The heat supply amount can be improved. At this time, even if the internal load of the engine increases due to the reduced cross-sectional area of the exhaust passage and a large drive torque is required for the engine, the power supplied from the generator is small and it is necessary to drive the generator. Since the torque is small, an excessive load is not applied to the engine and power supply is not hindered. Further, according to the second aspect of the present invention, the exhaust back pressure can be changed stepwise according to the detected power load, so that the hot water supply capacity can be effectively increased within the range of the engine capacity.

[0008]

EXAMPLES Next, the present invention will be explained based on examples. The combined heat and power device 1 shown in FIG. 1 is a generator 1 for supplying electric power.
0 and an engine 20 for driving the generator 10.
A waste heat recovery circuit 30 for recovering the waste heat of the engine 20; a water heating circuit 40 for supplying hot water using the waste heat recovered by the waste heat recovery circuit 30;
And an exhaust valve 50 arranged in the exhaust pipe 21.

The generator 10 driven by the engine 20 is
It is directly connected to the output shaft of the engine 20,
When the generator 10 is driven by the generator 10, the power corresponding to the load is generated, the generated power is controlled to a constant voltage by the power supply control circuit 11, and the power is supplied to the load via the generated power outlet 12. Supplied. The power consumed by the load is detected by detecting the current in the power detection circuit 13 provided between the power supply control circuit 11 and the generated power output port 12, and the detected information is
It is used in the capacity control circuit 60 described later.

The engine 20 is driven in accordance with the power consumption of the load when the power consumption of the load is less than or equal to the rating of the generator 10. When the power consumption is small, the rotation speed is maintained by a small amount of fuel. , If the power consumption is high,
The amount of fuel supply increases to maintain the rotation speed. Therefore, the heat generated by the engine 20 increases as the power consumption increases. The engine 20 includes a water jacket 31 for absorbing the heat generated by the engine 20 with cooling water, and the water jacket 31 is a part of a waste heat recovery circuit 30 described below.

The waste heat recovery circuit 30 includes a water jacket 31 for directly recovering the heat generated by the engine 20 with cooling water.
And an exhaust heat exchanger 32 for recovering exhaust heat of the engine 20
And a liquid-liquid heat exchanger 33 that heats the water in the water heating circuit 40 by exchanging heat with the water heating circuit 40, and a pipe member 34 that connects them to form a circulation path for cooling water. Further, the waste heat recovery circuit 30 is connected to a heat dissipation circuit 36 forming a circulation path between a radiator 35 and a water jacket 31 for radiating cooling water when the waste heat of the engine 20 is excessive. ing. A pump (not shown) that is operated by the engine 20 is provided in the water jacket 31, and the cooling water is circulated in the waste heat recovery circuit 30 and the heat radiation circuit 36. Further, the waste heat recovery circuit 30 and the heat dissipation circuit 36 are provided with a heat recovery valve 37 and a heat dissipation valve 38 for opening and closing the circuits for switching the circulation path of the cooling water in the water jacket 31, respectively. The radiator 35 is provided with, for example, an electric fan 35a for heat dissipation, which is controlled by a thermostat whose contacts are opened and closed according to the cooling water temperature.

The water heating circuit 40 heats water supplied from a water supply pipe 41 connected to a water supply source such as water supply by a liquid-liquid heat exchanger 33 to supply hot water from a faucet 42 and hot water supply. When the above is not performed, the water in the hot water storage tank 43 is circulated through the liquid-liquid heat exchanger 33 to store the heated water. In the water heating circuit 40, the water supply pipe 41
Are divided into three branches toward the liquid-liquid heat exchanger 33, the faucet 42, and the hot water storage tank 43, respectively.
A hot water supply valve 44, which is opened when hot water is supplied, and a pump 45, which operates when hot water is not supplied, are connected in parallel upstream of the hot water supply device, and the liquid-liquid heat exchanger 33 and the hot water storage tank 43 are connected to each other at the junction. A hot water mixing valve 46 is provided which mixes the hot water heated by the liquid-liquid heat exchanger 33 and the hot water stored in the hot water storage tank 43 according to the set temperature and supplies the mixed water to the downstream, and the hot water is provided downstream thereof. The hot water supplied from the mixing valve 46 and the water supplied from the water supply pipe 41 are mixed according to the temperature of the operation scale, and a hot and cold water mixing valve 47 for supplying the water to the faucet 42 is provided. A flow switch 48 is provided between the mixing valve 47 and the hot water to detect hot water supply. In addition, the hot water mixing valve 46 is provided with a pump 4 when hot water is not supplied.
5 to drive the hot and cold water in the hot water storage tank 43 into the liquid-liquid heat exchanger 33.
A circulation valve 49 for bypassing the hot water mixing valve 46 for circulation is provided in parallel.

The exhaust valve 50 is for increasing the amount of heat generated by the engine 20 by limiting the opening of the exhaust pipe 21. The exhaust valve 50 is driven by an actuator 51 such as a stepping motor, and the exhaust gas of the engine 20 is exhausted. The cross-sectional area of the exhaust pipe 21 is changed by adjusting the opening degree of the exhaust pipe 21 as a passage. When the opening of the exhaust pipe 21 is reduced by the exhaust valve 50, the exhaust back pressure of the engine 20 rises and the internal load of the engine 20 increases. Therefore, in order to maintain the generator 10 at the same rotation speed and obtain the same amount of power generation, a large torque is required. Therefore, in the engine 20, the fuel supply amount is increased and the torque of the engine 20 is increased. Increased. As a result, the amount of heat generated by the engine 20 increases, and the amount of heat recovered by the water jacket 31 and the amount of heat recovered by the exhaust heat exchanger 32 also increase.
However, if the exhaust valve 50 is closed when the load 20 consumes a large amount of power and the load of the engine 20 that drives the generator 10 is maximized, the generator 10 is sufficiently driven due to an increase in exhaust back pressure. Can not be. Therefore, in this embodiment, the power control circuit 60, which will be described later, detects the power consumption of the load, and even if the hot water supply capacity is low,
The exhaust valve 50 is closed only when the load of the engine 20 that drives the generator 10 is not the maximum.

The combined heat and power supply system 1 having the above structure is controlled by the capacity control circuit 60 which operates by the electric power supplied from the power supply control circuit 11. Capacity control circuit 60
Is composed of a driving member such as a CPU and a relay, and as shown in FIG. 2, has a heat recovery control unit 61 and a water heating control unit 62. The heat recovery control unit 61 opens and closes the heat recovery valve 37 and the heat radiation valve 38 in accordance with the load state of the water heating circuit 40 controlled by the water heating control unit 62, and the waste heat recovery circuit 30 and the heat radiation. The circuit 36 is switched. The water heating control unit 62 switches between the hot water supply operation and the heat storage operation according to the signal from the flow switch 48, and in each operation, the amount of heat obtained by the liquid-liquid heat exchanger 33 is insufficient and the heating water temperature is low. In this case, only when the maximum load is not applied to the engine 20, the waste heat recovery circuit 3
In order to increase the amount of heat recovery by 0, the exhaust valve 50 is controlled to reduce the opening degree of the exhaust pipe 21. for that reason,
The water heating circuit 40 is provided with a water temperature sensor 63 and a tank water temperature sensor 64 on the downstream side of the liquid-liquid heat exchanger 33 and in the hot water tank 43, respectively.

The operation of the capacity control circuit 60 will be described below with reference to FIG.
It will be described with reference to FIG. When an operation switch (not shown) is turned on and the capacity control circuit 60 operates, the hot water supply valve 44 is opened in the water heating circuit 40 as an initial state (step S1), and the heat recovery valve 37 is used in the waste heat recovery circuit 30. Is opened (step S2), and the heat radiation valve 38 is closed (step S3). At this time, the circulation valve 49 is closed. Subsequently, whether or not hot water supply is being performed is determined by the flow switch 48. When the flow switch 48 is off and hot water supply is not being performed (NO in step S4), heat storage control described below is performed ( Step S20).

If the flow switch 48 is on and hot water is being supplied (YES in step S4).
S), the hot water supply water temperature T1 detected by the water temperature sensor 63 on the downstream side of the liquid-liquid heat exchanger 33 is the set temperature Tset (for example, 50 to 60 ° C.) set in the water heating circuit 40.
When the hot water supply water temperature T1 is lower than the set temperature Tset (“>” in step S5), the generator 10
It is determined whether or not the load of the engine 20 that is driving the engine is the maximum load (step S6). Here, whether or not the load of the engine 20 is the maximum load depends on the engine load determined by the opening degree of the exhaust valve 50 driven by the actuator 51 and the power consumption detected by the power detection circuit 13. The actual load state of the engine 20 is calculated from the sum of the determined engine load and the load is compared with the rating of the engine 20. The opening degree of the exhaust valve 50 is detected by the control state of the actuator 51.

In step S6, if the load of the engine 20 is not the maximum load (NO), the actuator 51 drives the exhaust valve 50 in the closing direction (step S7) to increase the exhaust back pressure of the engine 20. Thus, the heat generation amount of the engine 20 is increased. As a result, in the waste heat recovery circuit 30, the cooling water is further heated in the water jacket 31 and the exhaust heat exchanger 32, and in the liquid-liquid heat exchanger 33, the water in the water heating circuit 40 is heated to a higher temperature. be able to. Engine 20
If the load is the maximum load (YES in step S6), the exhaust valve 50 is closed to some extent and the heat generation amount of the engine 20 is increased to some extent.
When the capacity of the engine 20 has already reached its maximum capacity and the exhaust valve 50 is further closed,
Since the generator 10 cannot be sufficiently driven due to the increase in the exhaust back pressure, the process proceeds to step S5 and the determinations of steps S5 and S6 are repeated.

In step S5, when the hot water supply water temperature T1 is higher than the set temperature Tset ("<"), the amount of waste heat recovered in the waste heat recovery circuit 30 is sufficiently larger than the amount of hot water supply. Therefore, it is determined whether or not the exhaust valve 50 is fully opened, and if the exhaust valve 50 is in the fully open state (YES in step S8), the engine 20 is operating at the lowest level according to the power consumption amount, and above. Engine 20
Since it is not possible to reduce the heat generation amount of the engine, instead of recovering the waste heat by the waste heat recovery circuit 30, the heat dissipation valve 38 is opened to perform heat dissipation of the engine 20 (step S
9) and close the heat recovery valve 37 (step S1).
0). When the exhaust valve 50 is not in the fully open state (NO in step S8), the exhaust valve 50 is driven in the opening direction so that the opening degree of the exhaust valve 50 becomes large (step S1).
1) The exhaust back pressure of the engine 20 is reduced. As a result, the internal load of the engine 20 decreases and the amount of heat generated by the engine 20 decreases, so that the hot water supply water temperature T1 gradually approaches the set temperature Tset.

In step S5, when the hot water supply water temperature T1 is equal to the set temperature Tset ("="), since the heat generation amount of the engine 20 is appropriate for the hot water supply condition, the opening degree of the exhaust valve 50 is increased. Does not change to either the closing direction or the opening direction, the process proceeds to step S1 and the operating state of the engine 20 is maintained as it is.

Next, the heat storage control in step S20 will be described with reference to FIG. The heat storage control is to accumulate waste heat of the engine 20 as much as possible when hot water is not supplied so that a sufficient hot water supply capacity can be obtained during hot water supply. In the accumulation control, the stored hot water temperature T2 in the hot water storage tank 43 detected by the tank water temperature sensor 64 is compared with the set temperature Tset, and the stored hot water temperature T2 is set to the set temperature Tse.
If it is lower than t (YE in step S21)
S), the hot water supply valve 44 is closed (step S22), the circulation valve 49 is opened instead (step S23), and the pump 45 is driven (step S24). This allows
Hot water in the hot water storage tank 43 is stored in the hot water storage tank 43, the pump 45, and the liquid-
The liquid heat exchanger 33 and the circulation valve 49 circulate.
At this time, it is determined whether or not the load of the engine 20 is the maximum load. If the load is the maximum load (YES in step S25), the exhaust back pressure of the engine 20 cannot be further increased. The process proceeds to S21 and the above steps are repeated.

When the load of the engine 20 is not the maximum load (NO in step S25), the opening degree of the exhaust pipe 21 is made small in order to raise the hot water temperature in the hot water storage tank 43 to the set temperature Tset. The exhaust valve 50 is driven in the closing direction (step S26). This allows the engine 2
The calorific value of 0 increases, and the temperature of the hot water heated in the liquid-liquid heat exchanger 33 can be increased. On the other hand, when hot water storage temperature T2 is equal to or higher than preset temperature Tset (NO in step S21), even if hot water is supplied at this time, sufficient hot water supply capacity is ensured by the hot water in hot water storage tank 43. It is in a state where there is no need for further heat storage. Therefore, the pump 45 is stopped to stop the heating of the hot water in the hot water storage tank 43 (step S27), the circulation valve 49 is closed (step S28), and the exhaust valve 50 is driven to the fully open state (step S29). ), The exhaust back pressure of the engine 20 is reduced, and the process proceeds to step S1. Even after the circulation valve 49 is closed, heat is radiated by the heat radiating circuit 36 as needed based on the detected water temperatures T1 and T2 of the water temperature sensor 63 and the tank water temperature sensor 64.

By the above control operation, in the combined heat and power supply device 1 of this embodiment, when hot water is not supplied, the hot water temperature in the hot water storage tank 43 is constantly maintained at the set temperature Tset or higher,
If the hot water temperature heated by the liquid-liquid heat exchanger 33 is lower than the hot water temperature of the hot water storage tank 43 when hot water is supplied, the hot water of the hot water storage tank 43 is used for hot water supply by the hot water mixing valve 46. In the present embodiment, FIG. 5 shows characteristics of hot water supply capacity with respect to exhaust back pressure when the opening of the exhaust pipe 21 is reduced by using the exhaust valve 50. Here, the hot water supply capacity at each exhaust back pressure when the opening of the exhaust valve 50 becomes small is determined by the hot water waste heat recovered by the water jacket 31 and the exhaust heat exchanger 32 when the exhaust valve 50 is fully opened. The hot water supply capacity based on the sum of the collected exhaust waste heat and 1.0 is expressed as a ratio, and in the solid line A, the sum of the warm water waste heat by the water jacket 31 and the exhaust waste heat by the exhaust heat exchanger 32 is shown. The hot water supply capacity of the water jacket 31
The hot water supply capacity of only the hot water waste heat is shown. Further, a solid line C shows the exhaust temperature with respect to the exhaust back pressure. As shown here, as the exhaust back pressure increases, the exhaust temperature rapidly increases, and at the same time, the hot water supply capacity due to the sum of the hot water waste heat and the exhaust waste heat rapidly improves.

FIG. 6 shows another embodiment of the present invention. In this embodiment, in place of the single exhaust valve 50 provided in the exhaust pipe 21 in the above embodiment, three types of butterfly valves 5 are provided.
2, 53, and 54 are provided in series in the exhaust pipe 21, and solenoids 52A, 53A, and 54A are provided to independently open and close each of the butterfly valves 52 to 54. The butterfly valves 52 to 54 have through-holes 52a and 53, which serve as throttles for obtaining different exhaust back pressures of the engine 20 when the exhaust pipe 21 is closed.
a and 54a are formed.

Diameters d1 and d of the through holes 52a to 54a
2 and d3 are to increase the hot water supply capacity as much as possible in a stable power supply state without the increase of the exhaust back pressure of the engine 20 when the butterfly valves 52 to 54 are closed, which does not hinder the power load. Is set so that the optimum exhaust back pressure according to the power load (power consumption) can be obtained. Here, as shown in FIG. 7, when the power load w is 3 [kW], 4 [kW], and 5 [kW] based on the relationship between the throttle ratio of each power load and the hot water supply capacity, the engine 20 The diameters d1, d2, and d3 at which the throttle ratios a, b, and c are obtained so that the load factor does not exceed the maximum load factor of the engine 20 indicated by the broken line are set in the relationship of d1 <d2 <d3. 21 inner diameter d0 is 30
The diameter d1 of each through hole 52a to 54a in the case of [mm],
d2 and d3 are shown in the corresponding portions of the respective aperture ratios a, b and c in the figure. In the above configuration, each butterfly valve 52, 53, 54 has a structure similar to that shown in FIG. 8 (A), FIG. 8 (B), and FIG.
As shown in (C), the exhaust back pressure of the engine 20 can be varied stepwise by individually closing it, and accordingly the hot water supply capacity can be increased stepwise.

The operation of the hot water supply operation when hot water supply is detected by the flow switch 48 in this embodiment will be described below with reference to FIG. The preset temperature Tset is compared with the water temperature T1 detected by the water temperature sensor 63, and the detected water temperature T1 is the set temperature Tse.
If higher than t (NO in step S31),
Since the hot water supply capacity is sufficient and there is no need to increase the exhaust back pressure of the engine 20, the process proceeds to step S38 and all butterfly valves 52 to 54 are opened. Detection water temperature T1
Is lower than the set temperature Tset (YES in step S31), the power detection circuit 13 detects the power load w (step S32). This power load w is 5k
If W is exceeded (YE in step S33)
S), the work for driving the generator 10 is the engine 2
If the load of 0 is large and the exhaust back pressure of the engine 20 is large, stable power supply becomes difficult and the hot water supply capability cannot be improved.
Moving to 38, all the butterfly valves 52 to 54 are opened.

When the power load w is 5 kW or less (NO in step S33), the determination in step S34 is performed, and the butterfly valve to be driven according to the power load w is determined and the throttle ratio is set as follows. select. Power load w
However, if it is 3 kW or less (“w ≦ 3” in step S34), only the butterfly valve 52 is closed and the other butterfly valves 53, 54 are opened, and the smallest throttle ratio a is selected (step S35). When the power load w is larger than 3 kW and lower than 4 kW (“3 <w <4” in step S34), only the butterfly valve 53 is closed and the other butterfly valves 52, 54 are opened to set the intermediate throttle ratio b. A selection is made (step S36). When the power load w is 4 kW or more and 5 kW or less (in step S34, “4 ≦
w≤5 "), only the butterfly valve 54 is closed and the other butterfly valves 52, 53 are opened, and the largest throttle ratio c is selected (step S37). As a result, it is possible to increase the hot water supply capacity in each power load w within a range that does not hinder the power supply.

After closing the butterfly valve according to each power load w, the process returns to step S31 and the detected water temperature T
1 is compared with the set temperature Tset, and if the detected water temperature T1 is lower than the set temperature Tset (YE in step S31)
S), the process proceeds to step S32, and the butterfly valve opening / closing control is performed again according to the detected power load w. If the detected water temperature T1 is equal to or higher than the set temperature Tset in step S31 (NO), the process proceeds to step S38, all butterfly valves 52 to 54 are opened, and the load on the engine 20 is reduced.

By the above control operation, even when the electric power load w is small, the hot water supply capacity can be greatly increased, and at that time, the electric power supply is not hindered.
FIG. 10 shows the hot water supply capacity in this embodiment together with the hot water supply capacity when throttle control by the butterfly valves 52 to 54 is not performed. As shown here, it can be seen that the hot water supply capacity in the shaded area has increased. Although not used in this embodiment, by closing a plurality of butterfly valves at the same time as shown in FIG. 8D, it is possible to obtain the same effect as that of using a butterfly valve having a smaller diameter.

As described above, in this embodiment, the generator 10
Exhaust valve 5 even if the power consumption of the load is small
The hot water supply capacity can be improved by increasing the exhaust back pressure to 0. In the above embodiment, the hot water is supplied by the waste heat of the engine. However, instead of the liquid-liquid heat exchanger, a heater core and a blower may be provided for heating.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a configuration of a combined heat and power supply device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a capacity control circuit of the combined heat and power supply apparatus according to the embodiment of the present invention.

FIG. 3 is a flowchart showing a control operation of the capacity control circuit according to the embodiment of the present invention.

FIG. 4 is a flowchart showing an operation of heat storage control of the capacity control circuit according to the embodiment of the present invention.

FIG. 5 is a characteristic diagram showing the relationship between exhaust back pressure, hot water supply capacity, and exhaust temperature in an example of the present invention.

FIG. 6 is a cross-sectional view showing an exhaust pipe and a butterfly valve and a plan view of the butterfly valve according to another embodiment of the present invention.

FIG. 7 is a characteristic diagram showing, for each electric power load, a relationship between a throttle valve throttle ratio, a hot water supply capacity, and an engine exhaust back pressure in another embodiment of the present invention.

FIG. 8 is a sectional view showing a state of a butterfly valve according to another embodiment of the present invention.

FIG. 9 is a flowchart for explaining the operation of another embodiment of the present invention.

FIG. 10 is a characteristic diagram showing hot water supply ability with respect to electric power load in another embodiment of the present invention.

[Explanation of symbols]

 1 Combined Heat and Power Supply Device 10 Generator 20 Engine 31 Water Jacket (Heat Recovery Means) 32 Exhaust Heat Exchanger (Heat Recovery Means) 33 Liquid-Liquid Heat Exchanger (Fluid Heating Means) 50 Exhaust Valve (Open / Close Valve) 52 Butterfly Valve 53 Butterfly valve 54 Butterfly valve 52a through-hole 53a through-hole 54a through-hole 63 Water temperature sensor (temperature detecting means) 64 Tank water temperature sensor (temperature detecting means)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaya Ichikawa 1-1-1, Showa-cho, Kariya city, Aichi prefecture Nihon Denso Co., Ltd.

Claims (2)

[Claims] 1. A generator for supplying electric power, an engine for driving the generator according to its load, a heat recovery means for recovering heat generated by the engine, and a heat recovery means for recovering the heat. In the combined heat and power device comprising a fluid heating means for heating the fluid by heat, an on-off valve for changing the cross-sectional area of the passage is arranged in the exhaust passage of the engine, and the fluid heated by the fluid heating means is A combined heat and power supply device comprising a temperature detecting means for detecting a temperature, and controlling the on-off valve according to a fluid temperature detected by the temperature detecting means. 2. The on-off valve is a plurality of butterfly valves each having a through-hole having a different throttle ratio with respect to the exhaust passage, and is detected by an electric power load detecting means for detecting a load amount of the generator. The combined heat and power supply device according to claim 1, wherein the plurality of butterfly valves are controlled according to the amount of the load.