JP2942852B2 - 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 electric energy, heat energy such as hot water or high-temperature steam is also extracted by the exhaust heat of the motors, and the overall efficiency of the entire system is relatively high. 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.

[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 co-generation in which a generator is driven by an engine to extract electric energy and heat energy simultaneously,
A cooling water supply pipe is connected by providing a jacket portion on the outer periphery of the engine, and a heat exchange device is interposed between the suction portion and the jacket portion by connecting the suction portion to maintain the jacket portion in a reduced pressure state. It is.

[0006]

[Function] By connecting the jacket portion to the suction means via a heat exchange device to reduce the pressure, more of the warm water heated by the exhaust heat of the engine is vaporized into steam even at the same temperature. Then, the heat exchange device is heated and exchanged with another heat exchange object, thereby heating the heat exchange object with the reduced-pressure steam. If the reduced pressure is below atmospheric pressure, 10
The object to be heated can be heated with steam at 0 ° C. or lower. Since steam has more heat than hot water, it can be efficiently heated. As the suction means, a so-called vacuum pump can be used, and a water-sealed vacuum pump, an ejector, a combination pump of an ejector and a spiral pump, or the like can be used.

[0007]

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 cooling water tank 4, a vacuum pump 12 as a suction means,
And, cogeneration is constituted by the heat exchange device 6.

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. A water supply pipe 17 is connected to the cooling water tank 4 to supply cooling water.

[0010] The low-pressure steam pipe 5 is connected to a heat exchange device 6.
The low-pressure steam pipe 5 passing through the heat exchange device 6 is connected to an ejector 21 in the vacuum pump 12. The object to be heated is supplied to the heat exchange device 6 through a tube 23, and the object to be heated is accommodated through a tube 24.

The vacuum pump 12 comprises an ejector 21, a tank 19, and a spiral pump 22 as a circulation pump. The vortex pump 22 communicates with the ejector 21 and the tank 19 through the circulation path 18. A cooling water supply pipe 20 for supplying cooling water to the tank 19 is connected to an upper portion of the tank 19. By driving the spiral pump 22, the water in the tank 19 is supplied to the ejector 21. When the water passes through the ejector 21 part, a suction force is generated and the upper space 16 is depressurized from the low-pressure steam pipe 5 and the inside of the jacket part 3 is also depressurized via the upper communication pipe 15. is there.

The upper portion 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 water to pass through the ejector 21, a suction force is generated, for example, the low-pressure steam pipe 5, the upper space 16 of the cooling water tank 4, the upper communication pipe 15, and the inside of the jacket portion 3. The pressure can be reduced to the atmospheric pressure or less. The cooling water supplied to the jacket part 3 from the lower communication pipe 13 is:
Heat is exchanged by the exhaust heat of the gas engine 1 to become hot water. In this case, since the upper space 16 is in a predetermined decompressed state from the inside of the jacket portion 3, the hot water is immediately vaporized to become steam and supplied to the heat exchange device 6 through the low-pressure steam pipe 5,
The object to be heated supplied from the pipe 23 is heated. 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.

The suction force generated in the ejector 21 can be controlled by adjusting the temperature of the water passing through the ejector 21. That is, since the suction force of the ejector 21 is generated only up to the saturation pressure of the passing fluid temperature, the amount of the cooling water to the tank 19 is detected by a temperature sensor or the like (not shown) to control the amount of the cooling water. , The suction force can be increased to increase the degree of decompression.

[0015]

According to the present invention, since the jacket portion is depressurized by the suction means via the heat exchange device, more depressurized steam is generated, and this depressurized steam causes the heat exchange device to operate. The object to be heated can be efficiently heated, and the effective use of heat energy can be measured.

[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 Cooling water tank 5 Low pressure steam pipe 6 Heat exchange device 12 Vacuum pump 13 Lower communication pipe 15 Upper communication pipe 16 Upper space 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 an outer periphery of the engine to connect a cooling water supply pipe, and the jacket portion is provided. An evaporative cooling engine for a cogeneration system, characterized in that a heat exchange device is interposed between the suction means and the jacket part, the suction means being connected to a suction means for maintaining the pressure in a reduced pressure state.