JP2942851B2 - 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 a cogeneration engine cooling mechanism and, more particularly, to an engine cooling mechanism for evaporating and cooling an engine using latent heat of evaporation of cooling water. Co-generation
In addition to driving electric generators by engines such as engines to extract electrical energy, the engine also extracts heat energy such as hot water from exhaust heat of the motor and high-temperature steam from exhaust gas. In recent years, it has become particularly popular because of its high cost, energy saving, and leveling of power consumption.

[0002]

2. Description of the Related Art For example, a conventional cogeneration shown in FIG. 2 has been used. This means that the generator 2 is driven by the gas engine 1 to obtain electric energy, and the exhaust gas from the gas engine 1 is supplied to the heat exchanger 8 via the pipe 7 so that the water supplied from the pipe 9 is heated. Exchange,
This is converted into high-pressure steam and supplied from a pipe 10 to a separate steam-using device. A jacket 3 is provided on the outer periphery of the gas engine 1, cooling water is supplied to the jacket 3 from a cooling water tank 4, the cooling water is warmed by exhaust heat of the gas engine 1, and returned to the upper portion of the cooling water tank 4. The part is taken out as low-pressure steam through the pipe 5 and as hot water through the pipe 6, and is used as heat energy by a separate heat-using device (not shown).

[0003]

In the conventional cogeneration described above, the exhaust heat of the gas engine 1 is exchanged by the jacket portion 3 with heat and converted into a part of low-pressure steam and hot water. There are only a few places where the heat energy is used, and if there is no place where the hot water is used, there is a problem that the heat energy cannot be used effectively. Hot water has a smaller amount of heat than steam and has problems such as a decrease in temperature during remote transportation, so that its use is limited.

[0004] Therefore, a technical problem of the present invention is to effectively utilize heat energy by converting cooling water that has exchanged heat with exhaust heat of an engine into as much steam as possible.

[0005]

The structure of the cogeneration evaporative cooling engine of the present invention is as follows. In a cogeneration system in which a generator is driven by an engine to extract electrical energy and heat exchange between engine exhaust gas and water to extract high-pressure steam, a steam ejector is arranged in a high-pressure steam line, A water supply pipe is connected by connecting a jacket section to the engine, and the jacket section exchanges heat with exhaust heat of the engine. The jacket section communicates with the suction section of the steam ejector.

[0006]

[Function] A steam ejector is widely used as a suction means, and is composed of a nozzle, a suction portion formed on an outer periphery of the nozzle, and a diffuser, and the high pressure steam flows down the nozzle to suction the suction portion. It produces power. Therefore, by connecting the jacket portion and the suction portion of the steam ejector, the low-pressure steam and residual air generated in the jacket portion are sucked by the steam ejector, and the inside of the jacket portion is reduced in pressure. When the inside of the jacket is decompressed, more of the warm water heated by the exhaust heat of the engine is vaporized into steam even at the same temperature.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In the present embodiment, a cogeneration using the same gas engine as that described in the conventional example is shown, and the same members as those in the conventional example are denoted by the same reference numerals.

In FIG. 1, a gas engine 1 and a generator 2
A heat exchanger 8 for exchanging heat with exhaust gas from the gas engine 1; and a jacket 3 provided on the outer periphery of the gas engine 1.
And a steam generator 12 through which high-pressure steam generated in the cooling water tank 4 and the heat exchanger 8 passes.
Configure the options.

The heat exchanger 8 and the gas engine 1 are connected by a pipe 7 to supply high-temperature exhaust gas to the heat exchanger 8. Water is supplied to the heat exchanger 8 through a water supply pipe 9, and high-pressure steam that has exchanged heat with exhaust gas is connected to a steam ejector 12 through a pipe 10. The steam ejector 12 includes a suction unit 19 and the suction unit 1.
9 and a diffuser 20
The suction unit 19 communicates with a low-pressure steam pipe 5 described later, and is connected to a separate steam-using device by a pipe 21 from the outlet side of the diffuser 20.

The jacket 3 of the gas engine 1 is connected to a lower portion of the cooling water tank 4 by a lower communication pipe 13 and is connected to an upper space 16 of the cooling water tank 4 by an upper communication pipe 15. The low pressure steam pipe 5 communicates with the upper space 16 via a valve 30. The low-pressure steam pipe 5 communicates with the suction section 19 of the steam ejector 12 as described above. A water supply pipe 17 is connected to the cooling water tank 4 to supply cooling water.

Next, the operation will be described. The high-temperature exhaust gas generated in the gas engine 1 is supplied from a pipe 7 to a heat exchanger 8 and exchanges heat with water supplied from a pipe 9 to generate high-pressure steam. It is supplied to the ejector 12. When the high-pressure steam passes through the steam ejector 12, a suction force is generated in the suction portion 19, and the upper space 16 and the upper communication pipe 15 of the cooling water tank 4 and the inside of the jacket portion 3 are reduced in pressure, for example, below atmospheric pressure. It can be. The cooling water supplied to the jacket portion 3 from the lower communication pipe 13 undergoes heat exchange due to the exhaust heat of the gas engine 1 to become hot water. In this case, since the upper space 16 is in a predetermined reduced pressure state from the inside of the jacket portion 3, the hot water is immediately vaporized and turns into steam, reaches the upper space 16, and is sucked into the steam ejector 12 through the pipe 5. Even when the temperature of the hot water is the same, the amount of steam can be increased by increasing the degree of pressure reduction.

In the steam ejector 12, the high-pressure steam flowing from the pipe 10 and the low-pressure steam flowing from the pipe 5 are mixed and turned into medium-pressure steam, which is supplied from the pipe 21 to a separate steam-using device and consumed as heat energy. .

[0013]

According to the present invention, more steam is generated by connecting the jacket portion to the steam ejector so as to reduce the pressure, so that the thermal energy can be effectively used.

[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.

FIG. 2 is a schematic configuration diagram showing a conventional example of cogeneration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas engine 2 Generator 3 Jacket 4 Cooling water tank 5 Low-pressure steam pipe 12 Steam ejector 13 Lower communication pipe 15 Upper communication pipe 16 Upper space 19 Suction unit 20 Diffuser

Claims (1)

(57) [Claims] In a cogeneration system in which a generator is driven by an engine to extract electric energy and heat exchange between engine exhaust gas and water to extract high-pressure steam, a steam ejector is connected to a high-pressure steam line. A water supply pipe is connected by providing a jacket portion on the outer periphery of the engine, and the jacket portion exchanges heat with engine exhaust heat, and the jacket portion communicates with the suction portion of the steam ejector. -Generation evaporative cooling engine.