JPH07113567A - Vaporization-cooled engine for cogeneration - Google Patents

Abstract

PURPOSE:To effectively utilize thermal energy in cogeneration by decreasing the generation of hot water and increasing the generation of steam and heating materials by thus generated steam. CONSTITUTION:A jacket 3 is formed on the outer side of a gas engine 1. The jacket 3 is connected to a cooling-water tank 4 by a lower communicating pipe 13 and an upper communicating pipe 15. To an upper space 16 provided in the cooling-water tank 4 a low-pressure steam pipe 5 is connected. The low- pressure steam pipe 5 is connected to a heat exchanger 6. The low-pressure steam pipe 5 passed through the heat exchanger 6 is connected to an ejector 21 of a vacuum pump 12. The vacuum pump 12 comprises a centrifugal pump 22, the ejector 21, and a tank 19.

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 a system for vaporizing and cooling an engine by latent heat of vaporization of cooling water. Cogeneration
In this system, a generator is driven by a prime mover such as an engine to extract electric energy, and heat energy such as hot water and high-temperature steam is also extracted by exhaust heat of the prime mover, so the overall efficiency of the entire system is relatively high. Energy saving
In addition, the power consumption has been leveled, and it has become particularly popular recently.

[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. This is because a gas engine drives a generator to obtain electric energy, a jacket is provided around the gas engine, and cooling water is supplied from a cooling water tank to this jacket to cool it by the exhaust heat of the gas engine. The water is warmed and returned to the upper part of the cooling water tank, a part of it is taken out as low-pressure steam through the pipe and also taken out as hot water, and is used as heat energy in a separate heat using device.

[0003]

In the above-mentioned conventional cogeneration, the exhaust heat of the gas engine is heat-exchanged at the jacket portion to be converted into a part of low-pressure steam and hot water. There are only a limited number of places to use as energy, and if there is no place to use hot water, heat energy
There was a problem that could not be used effectively. Compared with steam, warm water has a smaller amount of heat, and there are problems such as a decrease in temperature during remote transportation, so its use is limited.

Therefore, a technical object of the present invention is to measure the effective use of thermal energy by converting the cooling water that has exchanged heat with the exhaust heat of the engine into as much steam as possible.

[0005]

The constitution of the vaporization cooling engine for cogeneration according to the present invention is as follows. In cogeneration where the engine drives the generator to simultaneously extract electrical energy and thermal energy,
A jacket portion is provided on the outer periphery of the engine to connect a cooling water supply pipe, and is connected to a suction means for maintaining the jacket portion in a depressurized state, and a heat exchange device is interposed between the suction means and the jacket portion. Is.

[0006]

[Function] Since the jacket is connected to the suction means via the heat exchange device to reduce the pressure, more hot water warmed by the exhaust heat of the engine is vaporized and becomes steam even at the same temperature. By reaching the heat exchange device and exchanging heat with another heat exchange object, the heat exchange object is heated by the reduced pressure steam. 10 when the pressure is below atmospheric pressure
The object to be heated can be heated with steam of 0 ° C. or less. Since steam has a larger amount of heat than hot water, it can be efficiently heated. A so-called vacuum pump can be used as the suction means, and a water-sealed vacuum pump, an ejector, a combined pump of the ejector and the spiral pump, or the like can be used.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The illustrated embodiment will be described in detail. In this embodiment, a cogeneration using a gas engine similar to that described in the conventional example is shown.

In FIG. 1, a gas engine 1 and a generator 2 are shown.
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 suction means,
In addition, the heat exchange device 6 constitutes a cogeneration.

The jacket portion 3 of the gas engine 1 is connected to the lower portion of the cooling water tank 4 by the lower communication pipe 13 and is connected to the upper space 16 of the cooling water tank 4 by the 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.

The low-pressure steam pipe 5 is connected to the heat exchange device 6.
The low-pressure steam pipe 5 that has passed through the heat exchange device 6 is connected to the ejector 21 portion inside the vacuum pump 12. An object to be heated is supplied to the heat exchange device 6 via a pipe 23, and an object to be heated is accommodated via a pipe 24.

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

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

Next, the operation will be described. A suction force is generated by driving the swirl pump 22 to pass water through the ejector 21, and the low pressure steam pipe 5 causes the upper space 16 of the cooling water tank 4, the upper communication pipe 15, and the inside of the jacket 3 to be, for example. The pressure can be reduced to atmospheric pressure or less. The cooling water supplied from the lower communication pipe 13 to the jacket part 3 is
Exhaust heat of the gas engine 1 causes heat exchange to form hot water. In this case, since the upper space 16 is in a predetermined depressurized state from the inside of the jacket part 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 if the temperature of hot water is the same, the amount of steam can be increased by increasing the degree of pressure reduction.

The suction force generated at the ejector 21 part 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 saturated pressure of the passing fluid temperature, the amount of cooling water to the tank 19 is detected by a temperature sensor (not shown) or the like, and the cooling water amount is controlled to control the passing fluid temperature. By lowering the suction pressure, it is possible to increase the suction force and the degree of pressure reduction.

[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. The object to be heated can be efficiently heated, and the thermal energy can be effectively used.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Gas Engine 2 Generator 3 Jacket 4 Cooling Water Tank 5 Low Pressure Steam Pipe 6 Heat Exchanger 12 Vacuum Pump 13 Lower Communication Pipe 15 Upper Communication Pipe 16 Upper Space 19 Tank 21 Ejector 22 Whirlpool Pump

Claims (1)

[Claims] 1. In a cogeneration system in which an electric generator is driven by an engine to simultaneously extract electric energy and thermal energy, a jacket portion is provided on the outer periphery of the engine to connect a cooling water supply pipe, and the jacket portion is provided. A vaporization cooling engine for cogeneration, characterized in that a heat exchange device is interposed between the suction means and the jacket portion by connecting to a suction means for maintaining the pressure reduction state.