JP2942853B2 - Evaporative cooling engine of cogeneration - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine cooling system for cogeneration, and more particularly to a system for vaporizing and cooling an engine by latent heat of evaporation of a cooling medium. Cogeneration drives electric generators by a prime mover such as an engine to extract electric energy, and also extracts thermal energy such as hot water or high-temperature steam by the exhaust heat of the prime mover. Energy saving
In addition, power consumption has been leveled, and it has recently become particularly popular.

[0002]

2. Description of the Related Art As a conventional general cogeneration, for example, one using a gas engine as a prime mover has been used. In this method, a generator is driven by a gas engine to obtain electric energy, a jacket is provided on the outer periphery of the gas engine, cooling water is supplied from a cooling water tank to the jacket, and cooling is performed by exhaust heat of the gas engine. The water is warmed and returned to the upper part of the cooling water tank, a part of which is taken out as low-pressure steam through a pipe and also taken out as hot water, and used as heat energy by a separate heat-using device.

[0003]

In the conventional cogeneration described above, the exhaust heat of the gas engine is exchanged with the jacket portion to convert a part of the exhaust gas into low-pressure steam and hot water. There are only a limited number of places where energy can be used.
There was a problem that could not be used effectively. Hot water has a smaller amount of heat than steam and has a problem such as a temperature drop during remote transportation, so that its use is limited.

In the above-mentioned conventional cogeneration, the heat energy efficiency can be increased by increasing the steam temperature of the low-pressure steam as much as possible. However, if the steam temperature is increased, the cooling temperature of the engine is also reduced. As a result, there is a problem that the heat resistance of the engine is hindered.

Accordingly, a technical problem of the present invention is to generate as much steam as possible by exchanging heat with exhaust heat of an engine to effectively use heat energy and to lower the cooling temperature of the engine to reduce the heat resistance of the engine. In order to avoid any problems.

[0006]

The structure of the cogeneration evaporative cooling engine of the present invention is as follows. In co-generation in which a generator is driven by an engine to extract electric energy and heat energy simultaneously,
A jacket portion is provided on the outer periphery of the engine to connect a refrigerant supply pipe, and an ejector for maintaining the jacket portion in a reduced pressure state is connected to an ejector-type vacuum pump composed of a tank and a circulating pump. A cooling device for cooling is provided to connect the tank with the refrigerant supply pipe, and a heat exchange device is interposed between the ejector and the jacket portion.

[0007]

The refrigerant is supplied from the refrigerant supply pipe to the jacket on the outer periphery of the engine. The jacket section is connected to an ejector-type vacuum pump via a heat exchange device to reduce the pressure, so that the refrigerant in the jacket portion is immediately vaporized by the exhaust heat of the engine and turns into steam, which reaches the heat exchange device and is heated. The object is heated by the vaporized steam. Since steam has more heat than hot water, it can be efficiently heated. The vapor that has heated the object to be heated is again liquefied, sucked by the ejector of the ejector-type vacuum pump, and reaches the tank. A cooling device is attached to the tank,
The refrigerant accumulated in the tank is cooled by this cooling device. The cooled refrigerant is recirculated to the jacket on the outer periphery of the engine via the refrigerant supply pipe, and the above operation is repeated.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In this embodiment, a cogeneration using the same gas engine as that described in the conventional example will be described.

In FIG. 1, a gas engine 1 and a generator 2
And a jacket portion 3 provided on the outer periphery of the gas engine 1;
A refrigerant reservoir 4, an ejector-type vacuum pump 12, and
The cogeneration is constituted by the heat exchange device 6.

The jacket portion 3 of the gas engine 1 is connected to a lower portion of the refrigerant reservoir 4 by a lower communication tube 13 and is connected to an upper space 16 of the refrigerant reservoir 4 by an upper communication tube 15. The low pressure steam pipe 5 is connected to the upper space 16 via a valve 30.
To communicate.

[0011] The low-pressure steam pipe 5 is connected to a heat exchange device 6.
The low-pressure steam pipe 5 that has passed through the heat exchange device 6 is connected to an ejector
It is connected to the ejector 21 in the vacuum pump 12. An object to be heated is supplied to the heat exchange device 6 through a pipe 23,
The object to be heated is accommodated through the fourth member.

The ejector-type vacuum pump 12 is an ejector-type vacuum pump.
21; a tank 19; and a spiral pump 22 as a circulation pump. Ejector from spiral pump 22
The circulation path 18 communicates with the tank 21 and 21. Tank 1
Reference numeral 9 denotes a hermetic seal, and a refrigerant supply pipe 20 for supplying a refrigerant to the tank 19 is connected to an upper portion. By driving the spiral pump 22, the refrigerant in the tank 19 is supplied to the ejector 21. The suction force is generated by the refrigerant passing through the ejector 21 to reduce the pressure in the upper space 16 from the low-pressure steam pipe 5 and also reduce the pressure in the jacket portion 3 through the upper communication pipe 15. is there.

The tank 19 is connected to a cooling fluid supply pipe 11 as a cooling device for cooling the refrigerant in the tank 19, and a pipe 17 is connected from the lower part of the tank 19 to communicate with the refrigerant reservoir 4.

The upper part of the jacket 3 is connected to a heat exchanger 8 via a pipe 7. Water is supplied to the heat exchanger 8 from a pipe 9, heat-exchanges with high-temperature exhaust gas of the gas engine 1, becomes high-pressure steam, and is supplied from a pipe 10 to a separate high-pressure steam using device (not shown).

Next, the operation will be described. By driving the vortex pump 22 to cause the refrigerant to pass through the ejector 21, a suction force is generated, and the pressure in the upper space 16 and the upper communication pipe 15 of the refrigerant reservoir 4 and the inside of the jacket 3 is reduced from the low-pressure steam pipe 5. State. The refrigerant supplied from the lower communication pipe 13 to the jacket portion 3 undergoes heat exchange due to the exhaust heat of the gas engine 1 and rises in temperature. In this case, since the upper space 16 is in a predetermined reduced pressure state from the inside of the jacket portion 3, the refrigerant whose temperature has risen immediately evaporates and becomes vapor, which is supplied to the heat exchange device 6 through the low-pressure steam pipe 5 and the pipe 23.
The object to be heated supplied from is heated. Further, the amount of steam can be increased by increasing the degree of pressure reduction in the jacket portion 3.

The suction force generated in the ejector 21 can be controlled by adjusting the temperature of the refrigerant passing through the ejector 21. That is, since the suction force of the ejector 21 part occurs only up to the saturation pressure of the passing fluid temperature,
The amount of cooling fluid from the cooling fluid supply pipe 11 to the tank 19 is detected and controlled by a temperature sensor or the like (not shown), and by lowering the temperature of the passing fluid, the suction force can be increased to increase the degree of pressure reduction.

[0017]

According to the present invention, most of the refrigerant is vaporized into vapor and more decompressed vapor is generated by the evacuation of the jacket by the ejector-type vacuum pump via the heat exchange device. As a result, the object to be heated can be efficiently heated by the heat exchange device by the reduced-pressure steam, and the effective use of heat energy can be achieved. According to the present invention, vaporized steam is generated at a lower temperature than when cooling water is used by using a refrigerant,
The cooling temperature of the engine can be lowered, and the heat resistance of the engine is not hindered.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a cogeneration evaporative cooling engine of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas engine 2 Generator 3 Jacket part 4 Refrigerant reservoir 5 Low-pressure steam pipe 6 Heat exchange device 11 Cooling fluid supply pipe 12 Vacuum pump 13 Lower communication pipe 15 Upper communication pipe 19 Tank 21 Ejector 22 Spiral pump

Claims (1)

(57) [Claims] In a cogeneration system in which a generator is driven by an engine to extract electric energy and heat energy simultaneously, a jacket portion is provided on the outer periphery of the engine, a refrigerant supply pipe is connected, and the jacket portion is connected to the engine. Connected to an ejector-type vacuum pump composed of an ejector, a tank and a circulating pump for maintaining a reduced pressure state, and provided with a cooling device for cooling the refrigerant in the tank, communicating the tank with the refrigerant supply pipe, Co-generator characterized by interposing a heat exchange device between the ejector and the jacket
Evaporative cooling engine.