JPH09264189A - Cogeneration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To selectively use plural kinds of energies and improve running cost by providing such a constitution as to be capable of selectively executing a system operation by engine drive, a system operation by heat input from a heater, a system operation using both the engine drive and the heat input from the heater. SOLUTION: As a target of interlocking by a rotation transmitting system 4, an engine 1, a generator 2, and a gas cycle equipment part 3 are provided. The gas cycle equipment part 3 has high temperature, middle temperature and low temperature cylinders C1-C3 for discharging and sucking operation gas G with being accompanied by the operation of pistons p1-p3, each pair of cylinder chambers C1, C2 and C2, C3 is allowed to communicate each other through gas communicating passages 7a, 7b having regenerating heat exchangers 8a, 8b interposed thereto. This device also has a heater 9 for inputting a heat to the high temperature cylinder chamber C1, a heat exchanger 10 for taking out the hot heat generated in the middle temperature cylinder C2, and a heat exchanger 11 for taking out the cold heat generated in the low temperature cylinder chamber C3, and the mutual phase difference of each piston p1-p3 is changed by a changing means 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cogeneration system, and more particularly to a cogeneration system that outputs cold heat, warm heat, and electric power.

[0002]

2. Description of the Related Art Conventionally, since there are a compression heat pump driven by an engine and a generator driven by an engine, cold heat and hot heat are mechanically interlocked with each other by mechanically interlocking components of the system via a rotary transmission system. As a cogeneration system that outputs electric power, as shown in FIG. 4, a system in which the engine 1, the generator 2g, and the compression heat pump H are linked via the rotary transmission system 4 is conceivable.

[0003]

However, in this system, since the operation of the system is limited to driving the engine, the demand concentration on one type of energy is avoided and the economical efficiency is improved by selectively using a plurality of types of energy. In addition, there is a problem of lack of functionality in terms of effective use of unused energy / excess energy, noise reduction of night driving, and the like.

A main object of the present invention is to enable system operation by an engine, system operation by a heat input, and system operation using both an engine and a heat input, while making the system configuration compact and simple, thereby improving the functionality. Is to improve.

[0005]

[Means for Solving the Problems]

[Invention of Claim 1] In the invention of Claim 1,
In the gas cycle device section 3 that is interlocked with the rotary transmission system 4, the high temperature cylinder chamber C1, the intermediate temperature cylinder chamber C2, and the low temperature cylinder chamber C3 are connected to the gas communication passage 7a along with the operation of the pistons p1 to p3. , 7b, and under the action of the regenerative heat exchangers 8a, 8b interposed in the gas communication passages 7a, 7b, the working gas is discharged and sucked.
Accordingly, of the cylinder chambers C1 to C3, the pair of the high temperature cylinder C1 and the intermediate temperature cylinder chamber C2 is
The Stirling cycle is executed under the heat input to the high temperature cylinder chamber C1 by the heater 9 to function as the Stirling engine, and the generated power is output to the rotary transmission system 4.

Of the cylinder chambers C1 to C3, the pair of the medium temperature cylinder chamber C2 and the low temperature cylinder chamber C3 is subjected to a reverse Stirling cycle using the power from the rotary transmission system 4 as an input to form a Stirling heat pump. As a result, the generated cold heat in the low temperature cylinder chamber C3 is taken out from the heat exchanger 11 for cold heat extraction, and the hot heat generated in the intermediate temperature cylinder chamber C2 is taken out as the heat output from the heat exchanger 10 for hot heat extraction. Take it out.

In the gas cycle equipment section 3, by giving a change command to the phase difference changing means 15, the phase difference changing means 15 holds the cylinder chambers C1 to C.
The above-mentioned Stirling cycle and the reverse Stirling cycle are changed by changing the mutual phase difference relationship between the three pistons p1 to p3 (in other words, the timing relationship between the working gas discharge and suction of each cylinder chamber C1 to C3). Let me
State of expression of the engine function in the gas cycle equipment unit 3 that receives heat from the heater 9 and state of expression of the heat pump function in the gas cycle equipment unit 3 that receives power from the rotary transmission system 4 Is adjusted so that the engine 1, the generator 2g, and the gas cycle equipment section 3 are adjusted.
As a whole system in which the motors are linked via the rotation interlocking system 4, the following operation modes (M1) to (M9) can be selected (see FIG. 2).

(M1) Both the engine function and the heat pump function of the gas cycle equipment section 3 are suspended, and the generator 2g is operated only by the power generated by the engine 1 to obtain an electric power output.

(M2) The engine function of the gas cycle equipment section 3 is suspended, and only the power generated by the engine 1
While operating the generator 2g, the gas cycle equipment section 3
To function as a heat pump, thereby obtaining electric power output and heat output of cold heat and warm heat.

(M3) The engine function of the gas cycle equipment section 3 and the generator 2g are stopped, and the gas cycle equipment section 3 is caused to function as a heat pump only by the power generated by the engine 1 to generate the heat output of cold heat and warm heat. obtain.

(M4) The heat pump function of the gas cycle equipment section 3 is suspended, and the generator 2g is driven by the generated power of the engine 1 and the engine function of the gas cycle equipment section 3 to output electric power. obtain.

(M5) The generator 2g is driven by the power generated by the engine 1 and the power generated by the engine function of the gas cycle equipment section 3, and at the same time the gas cycle equipment section 3 is caused to function as a heat pump. And cold and hot heat output.

(M6) The generator 2g is stopped, and the power generated by the engine 1 and the power generated by the engine function of the gas cycle device unit 3 cause the gas cycle device unit 3 to function as a heat pump to cool and heat heat. Get the output.

(M7) The heat pump function of the engine 1 and the gas cycle equipment section 3 is stopped, and only the power generated by the engine function of the gas cycle equipment section 3 is used.
The generator 2g is operated to obtain electric power output.

(M8) The engine 1 is stopped, the generator 2g is operated only by the power generated by the engine function of the gas cycle equipment section 3, and the gas cycle equipment section 3 is caused to function as a heat pump. And cold and hot heat output.

(M9) The engine 1 and the generator 2g are stopped, and the gas cycle equipment section 3 is caused to function as a heat pump only by the power generated by the engine function of the gas cycle equipment section 3 to generate heat output of cold heat and warm heat. obtain.

That is, according to the invention described in claim 1, in obtaining the electric power output and the heat output of cold heat and warm heat as the system output, the system operation by the engine drive of the above (M1) to (M3), the above (M7) ~ (M9) system operation by heat input from the heater, and (M4) ~
System operation that uses both the engine drive of (M6) and heat input from a heater can be selectively performed, which avoids concentration of demand for one type of energy and improves economic efficiency by selectively using multiple types of energy. In addition, it is possible to make effective use of unused energy and surplus energy in heat input from the heater, and to carry out operation only by heat input at night to reduce noise, etc. High functionality can be obtained.

In addition, while having such high functionality, the system configuration basically has three system configurations including an engine, a generator, and a gas cycle equipment section, similar to the system shown in FIG. 4 described above. A compact and simple system configuration can be achieved by mechanically interlocking devices with a rotary transmission system.

[Invention of Claim 2] In the invention of Claim 2 (see FIG. 1), the objects to be linked by the rotary transmission system 4 are an engine 1, a generator 2g, and a gas cycle equipment section 3
By installing an electric motor 2m together with (M
In addition to the operation modes 1) to (M9), the following operation modes (M10) and (M11) can be selected (see FIG. 2).

(M10) The engine functions of the engine 1 and the gas cycle equipment section 3 are stopped, and the gas cycle equipment section 3 is caused to function as a heat pump only by the generated power of the electric motor 2m to obtain heat output of cold heat and warm heat. .

(M11) The engine 1 is stopped, and the power generated by the electric motor 2m and the power generated by the engine function of the gas cycle equipment section 3 cause the gas cycle equipment section 3 to function as a heat pump to output cold and hot heat. To get

If necessary, the engine function of the gas cycle equipment section 3 is stopped, and the gas cycle equipment section 3 is caused to function as a heat pump by the generated power of the engine 1 and the generated power of the electric motor 2m to cool and heat the engine. Of the engine 1 and the power generated by the electric motor 2m and the power generated by the engine function of the gas cycle device unit 3 to cause the gas cycle device unit 3 to function as a heat pump to cool the engine. Also, it is possible to enable the selective implementation of the operation mode (M13) such as obtaining the heat output of warm heat.

That is, according to the invention of claim 2, in addition to the operation modes of the above (M1) to (M9), the above (M1)
10) and (M11) operation modes, and if necessary, the operation modes of (M12) and (M13) can be selected and implemented, for example, in terms of effective use of surplus power at night, Higher functionality can be obtained.

[Invention of Claim 3] In the invention of Claim 3 (see FIG. 1), the engine 1, the generator 2 g, the gas cycle equipment part 3 are targeted for interlocking by the rotary transmission system 4.
When the electric motor 2m is provided together with the electric power generator / motor 2 which functions as a generator by power input from the rotary transmission system 4 and also functions as an electric motor by electric power input, the generator 2g and the electric motor 2m to be linked are To do.

Therefore, according to the third aspect of the present invention, the number of system components is reduced and the system configuration is made compact as compared with the case where dedicated generators and electric motors are separately provided. And can be simplified.

[Invention of Claim 4] In the invention of Claim 4 (see FIGS. 1 and 2), the system operation by the engine drive (or the electric motor drive) as described above, the system by the heat input from the heater 9 In addition to changing the piston phase difference relationship in the gas cycle equipment part 3 by the phase difference changing means 15 in the operation and the switching of the system operation in which the engine drive (or the electric motor drive) is combined with the heat input from the heater 9, , Engine drive (or electric motor drive)
And the heat input from the heater 9 are used together (M4) to (M4)
6), (M11), (M13), and other operating modes, by changing the piston phase difference relationship more finely by the phase difference changing means 15, the expression state of the engine function in the gas cycle equipment section 3 is changed. Thus, the input ratio between the power input by the engine 1 or the electric motor 2m and the heat input from the heater 9 can be appropriately changed.

That is, according to the fourth aspect of the invention, in the operation mode in which the engine drive (or the electric motor drive) and the heat input from the heater are used together, the power input by the engine or the electric motor and the heat input from the heater are performed. By appropriately changing the input ratio with, it is possible to more flexibly respond to various operating conditions and obtain higher functionality.

[Invention of Claim 5] In the invention of Claim 5 (see FIG. 1), when the gas cycle device 3 is caused to function as an engine by the heat input from the heater 9, the burner 12 is generated as the input heat. Uses heat of combustion.

Therefore, according to the invention described in claim 5, it is possible to effectively achieve the noise reduction at night and the like by the system operation of only the heat input, which uses the combustion heat generated by the burner as the input, and the fuel used in the engine. The fuel used by the burner and the fuel used by the burner may be different from each other to allow the system to operate with one or both of the two types of fuel.

[Invention of Claim 6] In the invention of Claim 6 (see FIG. 3), when the gas cycle device 3 is caused to function as an engine by the heat input from the heater 9, another system is used as the input heat. The waste heat or surplus heat at 19 is used.

That is, according to the sixth aspect of the invention, the operating cost can be reduced and the energy can be effectively saved by the system operation using the exhaust heat or the surplus heat in the other system.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 1 is a gas engine, 2 is a generator / motor that functions as a generator 2g by power input, and functions as an electric motor 2m by power input, and 3 is a gas cycle equipment section. The gas engine 1, the combined generator / motor unit 2, and the gas cycle device section 3 are linked by a rotary shaft 4 as a rotary transmission system.

Reference numeral 5 is a fuel supply path to the gas engine 1, and 6 is an exhaust path from the gas engine 1. The fuel F1 used in the gas engine 1 is natural gas, propane gas, or pollution-free fuel. Various gas fuels such as methanol reformed gas and hydrogen gas can be applied.

The gas cycle equipment section 3 has, as its equipment configuration, separate pistons p1, p2, which are interlocked with the rotary shaft 4.
a high temperature cylinder chamber C1, a medium temperature cylinder chamber C2, and a low temperature cylinder chamber C, each of which has a p3 and discharges and sucks the working gas G individually.
3, the high temperature cylinder chamber C1 and the medium temperature cylinder chamber C2 are communicated with each other through the gas communication passage 7a, and the medium temperature cylinder chamber C2 and the low temperature cylinder chamber C3 are communicated with each other through the gas communication passage 7b. Gas communication passage 7a,
Regenerative heat exchangers 8a and 8b are provided in each of 7b.

Further, 9 is a heater for inputting heat to the high temperature cylinder chamber C1, 10 is a heat exchanger for extracting heat generated in the medium temperature cylinder chamber C2, and 11 is a low temperature cylinder chamber C.
It is a heat exchanger for cold heat extraction that takes out the cold heat generated in No. 3.

In other words, in the gas cycle equipment section 3, the high temperature cylinder chamber C1, the medium temperature cylinder chamber C2, and the low temperature cylinder chamber C3 are respectively operated by the gas communication passages 7a and 7b as the pistons p1 to p3 operate. The working gas is discharged and sucked under communication and under the action of the regenerative heat exchangers 8a and 8b interposed in the gas communication passages 7a and 7b, whereby the high temperature cylinder C1 and the intermediate temperature of the cylinders C1 to C3 are discharged. With respect to the pair with the cylinder chamber C2, the Stirling cycle is executed under the heat input to the high temperature cylinder chamber C1 by the heater 9 to function as the Stirling engine, and the generated power is output to the rotating shaft 4.

Of the cylinder chambers C1 to C3, the pair of the medium temperature cylinder chamber C2 and the low temperature cylinder chamber C3 is subjected to a reverse Stirling cycle with the power from the rotary shaft 4 as an input to function as a Stirling heat pump. As a result, as the heat output, the cold heat generated in the low temperature cylinder chamber C3 is taken out from the heat exchanger 11 for taking out cold heat, and the hot heat generated in the intermediate temperature cylinder chamber C2 is taken out from the heat exchanger 10 for taking out heat. Take it out.

The heater 9 has a high temperature cylinder chamber C1.
As a heat input to the burner 12, a type of applying combustion heat generated by the burner 12 to the high temperature cylinder chamber C1 is adopted, 13 is a fuel supply passage to the burner 12, and 14 is an exhaust passage of combustion exhaust gas. Further, as the fuel F2 used in the burner 12, various gas fuels such as natural gas, propane gas, methanol reformed gas, hydrogen gas, sewage treatment methane gas as unused fuel, biomass, recycled plastic recycled oil, etc. Or liquid fuel can be adopted.

Reference numeral 15 denotes a variable phase device as a phase difference changing means for changing the mutual phase difference relationship between the pistons p1 to p3 in conjunction with the rotary shaft 4 in response to a change command from the command device 16. In the example, as a specific configuration thereof, a rotary shaft portion 4a including a crank for the piston p1 of the high temperature cylinder chamber C1 and the other two cylinder chambers C
In the connection with the rotary shaft portion 4b having cranks for the pistons p1 and p2 of C2, C3, the rotary shaft portions 4a and 4b are relatively rotated by a required rotation angle by a differential mechanism. p1
And the pistons p1, of the other two cylinder chambers C2, C3
It is configured to change the phase difference relationship with p2.

That is, by changing the piston phase difference relationship by the variable phase shifter 15, the Stirling cycle,
And, by changing the reverse Stirling cycle, the heater 9
The expression state of the engine function in the gas cycle equipment unit 3 that receives heat from the engine and the expression state of the heat pump function in the gas cycle equipment unit 3 that receives power from the rotating shaft 4 as input, As a result, as a whole system for interlocking the gas engine 1, the combined power generator / motor 2 and the gas cycle equipment section 3, the following (M
It is possible to selectively implement the operation modes 1) to (M11).

(M1) Engine drive / power output: Both the engine function and the heat pump function of the gas cycle equipment section 3 are suspended, and the combined power generation / motor 2 is operated as a generator 2g only by the power generated by the gas engine 1. , Get the power output.

(M2) Engine drive / electric power / heat output: The engine function of the gas cycle equipment section 3 is suspended, and only the power generated by the gas engine 1 is used to generate power / motor.
Is operated as a generator 2g, and the gas cycle equipment section 3 is caused to function as a heat pump, thereby obtaining electric power output and heat output of cold heat and warm heat.

(M3) Engine drive / heat output: The engine function of the gas cycle equipment section 3 and the generator / motor combination machine 2 are stopped, and the gas cycle equipment section 3 is heat pumped only by the generated power of the gas engine 1. It functions and obtains heat output of cold heat and hot heat.

(M4) Engine drive / heat input / power output: The heat pump function of the gas cycle equipment section 3 is stopped and the generated power of the gas engine 1 and the engine function of the gas cycle equipment section 3 The generator / motor generator 2 is operated as a generator 2g to obtain electric power output.

(M5) Engine drive / heat input / power / heat output: The combined power generation / motor 2 is used as a generator 2g by the power generated by the gas engine 1 and the power generated by the engine function of the gas cycle equipment section 3. While operating, the gas cycle equipment part 3 is made to function as a heat pump, and thereby, electric power output and heat output of cold heat and warm heat are obtained.

(M6) Engine drive, heat input / heat output:
The generator / motor combination machine 2 is stopped, and the gas cycle equipment section 3 is caused to function as a heat pump by the generated power of the gas engine 1 and the engine power of the gas cycle equipment section 3 to generate heat output of cold heat and warm heat. obtain.

(M7) Heat input / power output: The heat pump function of the gas engine 1 and the gas cycle equipment section 3 is suspended, and only the power generated by the engine function of the gas cycle equipment section 3 is used to generate and generate electric power. 2 generator 2
Run as g and get power output.

(M8) Heat input / electric power / heat output: The gas engine 1 is stopped and only the power generated by the engine function of the gas cycle equipment section 3 is used to operate the combined power generator / motor 2 as a generator 2g. The gas cycle device section 3 is caused to function as a heat pump, and thereby, electric power output and heat output of cold heat and hot heat are obtained.

(M9) Heat input / heat output: The gas engine 1 and the combined generator / motor machine 2 are stopped and the gas cycle equipment section 3 is heat pumped only by the power generated by the engine function of the gas cycle equipment section 3. It functions and obtains heat output of cold heat and hot heat.

(M10) Electric motor drive (electric power input) / heat output: The engine functions of the gas engine 1 and the gas cycle equipment part 3 are stopped, and both power generation and electric power are supplied by electric power input using surplus power at night. The gas cycle device section 3 is caused to function as a heat pump only by the generated power as the electric motor 2m of the machine 2, and heat output of cold heat and hot heat is obtained.

(M11) Electric motor drive (electric power input) / heat input / heat output: The gas engine 1 is stopped, and the power generated as the electric motor 2m of the electric power generating / electric motor 2 by the electric power input and the gas cycle equipment part 3 are generated. The gas cycle device section 3 is caused to function as a heat pump by the power generated by the engine function, and heat output of cold heat and warm heat is obtained.

In addition to enabling the selective execution of these operation modes, among the above operation modes, the engine drive or the electric motor drive and the engine function of the gas cycle equipment section 3 by the heat input from the heater 9 are performed. Operating modes that use both, that is, (M4), (M5), (M6), (M
Regarding the operation modes of 11), when the operation modes are executed, the piston p
The phase difference relationship of 1 to p3 is further finely changed in a continuous or multi-step manner to finely adjust the expression state of the engine function of the gas cycle equipment section 3 to adjust the gas engine 1 or the electric motor according to various operating conditions. 2m power input,
The input ratio to the heat input from the heater 9 can be changed appropriately.

Reference numeral 17 indicates when the gas engine 1 is at rest,
A clutch 18 for disconnecting the interlocking between the gas engine 1 and the other system constituent devices 2 and 3, and 18 when the gas cycle device part 3 suspends both the engine function and the heat pump function of the gas cycle device part 3 and other system constituent devices. 1,
It is a clutch that breaks the linkage with 2.

[Other Embodiments] Other embodiments will be listed. The engine 1 is not limited to a gas engine, and may be a liquid fuel engine or a gas-liquid mixed fuel engine.

Instead of providing the generator / motor combination machine 2, a dedicated machine for the generator 2g may be equipped, and the generator 2g may be provided.
When equipped with the electric motor 2m, separate dedicated machines may be adopted for the generator 2g and the electric motor 2m.

The heater 9 is not limited to the type in which the combustion heat generated by the burner 12 is used as the input heat to the high temperature cylinder C1, but the heat of various generation and existence forms is input to the high temperature cylinder C1. For example, as shown in FIG. 3, exhaust heat or surplus heat in the other system 19 may be used as input heat to the high temperature cylinder C1. In this case, the other system 1
It is also possible to add an auxiliary heating means for converting the exhaust heat from 9 and the surplus heat into heat having a high temperature level to be used as the input heat to the high temperature cylinder C1.

The rotary transmission system is not limited to the form in which the system constituent devices 1, 2 and 3 to be interlocked are arranged on one axis and interlocked with each other, as in the above-described embodiment, and the system configuration to be interlocked with is not limited to this. The specific arrangement of the devices 1, 2 and 3 and the specific transmission structure of the rotary transmission system according to each of the arrangements can be modified in various ways, and if necessary, the rotary transmission system can be provided with a clutch. Alternatively, a structure equipped with a speed change mechanism may be adopted.

In order to construct each cylinder chamber C1, C2, C3, instead of the type in which each separate cylinder is individually equipped with a piston as in the above-described embodiment, a so-called displacer type cylinder-piston structure is adopted. Good.

The heat exchanger 10 for extracting heat is a gas communication passage 7a between the middle temperature cylinder chamber C2 and the high temperature side regeneration heat exchanger 8a, and the middle temperature cylinder chamber C2 and the low temperature side regeneration heat exchanger 8b.
May be interposed in the gas communication passage 7b between
On the other hand, the heat exchanger 11 for extracting cold heat is provided in the low temperature cylinder chamber C.
3 may be interposed in the gas communication passage 7b between the low temperature side regenerative heat exchanger 8b. Further, the heater 9 may be installed in the gas communication passage 7a between the high temperature cylinder chamber C1 and the high temperature side regenerative heat exchanger 8a.

In the above-described embodiment, the phase difference relationship between the piston p1 of the high temperature cylinder C1 and the pistons p2 and p3 of the other two cylinder chambers C2 and C3 is changed by the variable phase shifter 15 as the phase difference changing means. However, the phase difference relationship between the pistons p1 to p3 in each of the cylinder chambers C1 to C3 and the other pistons may be individually changed by the phase difference changing means.

The specific structure of the phase difference changing means can be variously modified by applying various types of well-known differential mechanisms, and the change command for operating the phase difference changing means can be changed. Either of the form in which the phase difference changing means is automatically operated according to the command signal or the form in which the phase difference changing means is operated by a manual operation may be adopted.

As the working gas G used in the gas cycle equipment section 3, various gases such as helium gas, hydrogen gas, or air can be adopted.

The hot heat taken out from the heat exchanger 10 for taking out heat and the cold heat taken out from the heat exchanger 11 for taking out cold heat are used for air conditioning such as heating and cooling, hot water supply, heating or cooling of articles, etc., respectively. It can be used for various purposes, and the generated power can also be used for various purposes such as lighting and operation of equipment.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a perspective view showing the overall configuration of a system.

[Fig. 2] Chart showing operation modes

FIG. 3 is a system configuration diagram showing another embodiment.

[Fig. 4] Conventional system configuration diagram

[Explanation of symbols]

 4 rotation transmission system 1 engine 2g generator 3 gas cycle equipment part p1 to p3 piston G working gas C1 high temperature cylinder chamber C2 medium temperature cylinder chamber C3 low temperature cylinder chamber 7a, 7b gas communication passage 8a, 8b regenerative heat exchanger 9 heater 10 Heat exchanger for taking out hot heat 11 Heat exchanger for taking out cold heat 15 Phase difference changing means 2 m Electric motor 2 Combined generator / motor 12 Burner 19 Other systems

Claims (6)

[Claims] 1. An engine (1), a generator (2g), and a gas cycle equipment part (3) are provided as objects of interlocking by a rotary transmission system (4), and the equipment configuration of the gas cycle equipment part (3). As the pistons (p1 to p) interlocking with the rotation transmission system (4)
3) is provided with a high temperature cylinder chamber (C1) for individually discharging and sucking the working gas (G), a medium temperature cylinder chamber (C2) and a low temperature cylinder chamber (C3), and the high temperature cylinder chamber (C1) and the above Medium temperature cylinder chamber (C
2) a gas communication passage (7a) for communicating with the medium temperature cylinder chamber (C2) and a low temperature cylinder chamber (C3) for communicating with the low temperature cylinder chamber (C3). ), (7b) with regenerative heat exchangers (8a), (8b) interposed respectively, and a heater (9) for inputting heat to the high temperature cylinder chamber (C1) and a medium temperature cylinder chamber (C2). A heat exchanger (10) for extracting heat generated heat and a heat exchanger (11) for extracting cold heat generated in the low temperature cylinder chamber (C3) are provided, and each of the cylinder chambers (C1 to C1) is provided. C3) piston (p1 to p
A cogeneration system provided with a phase difference changing means (15) for changing the mutual phase difference relationship of 3) according to a change command. 2. The cogeneration system according to claim 1, wherein an electric motor (2 m) is added as an object to be interlocked by the rotary transmission system (4). 3. The generator (2g) and the electric motor (2)
The m / m is a generator / motor combined machine (2) which functions as a generator by power input from the rotary transmission system (4) and functions as an electric motor by power input. Generation system. 4. The phase difference changing means (15) includes power input to the rotary transmission system (4) by the engine (1) or the electric motor (2m), and the high temperature cylinder by the heater (9). The piston phase difference relation changing operation for changing the input ratio between the power input and the heat input is configured to be possible in an operation mode in which heat input to the chamber (C1) is performed in parallel. Cogeneration system. 5. The heater (9) is configured to apply the combustion heat generated by the burner (12) to the high temperature cylinder chamber (C1) as a heat input to the high temperature cylinder chamber (C1). The cogeneration system according to 2, 3, or 4. 6. The heater (9) applies exhaust heat or surplus heat from another system (19) to the high temperature cylinder chamber (C1) as heat input to the high temperature cylinder chamber (C1). The cogeneration system according to claim 1, 2, 3, 4 or 5.