JPH07113565A - 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. 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 upper space 16 is connected to a nozzle 19 of a vacuum pump 12 by a pipe 18. The vacuum pump 12 comprises a centrifugal pump 22 and an ejector 21 which the nozzle 19 and a diffuser 20 make up.

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, the generator is driven by a prime mover such as an engine to extract electrical energy, and the exhaust heat of the prime mover is also extracted as thermal energy such as hot water or high-temperature steam, so the overall efficiency of the entire system is relatively high. It has become extremely energy-saving and evens out electric power consumption, and it has become particularly popular recently.

[0002]

2. Description of the Related Art As a conventional cogeneration, for example, the one shown in FIG. 2 has been used. This is because the gas engine 1 drives the generator 2 to obtain electric energy, and the jacket 3 is provided on the outer periphery of the gas engine 1,
Cooling water is supplied from the cooling water tank 4 to the jacket portion 3, the cooling water is warmed by the exhaust heat of the gas engine 1 and returned to the upper portion of the cooling water tank 4, and a part thereof is taken out as low-pressure steam through the pipe 5. At the same time, it is taken out as warm water through the pipe 6 and used as heat energy by a separate heat using device (not shown). Further, the exhaust gas from the gas engine 1 is supplied to the heat exchanger 8 via the pipe 7, the feed water supplied from the pipe 9 is heat-exchanged to be converted into high-pressure steam, and the supplied water is supplied from the pipe 10 to a separate steam using device. To do.

[0003]

In the above conventional cogeneration, the exhaust heat of the gas engine 1 is exchanged with heat in the jacket portion 3 to convert it into a part of low pressure steam and hot water. There are only a limited number of places where heat energy is used, and there is a problem that the heat energy cannot be effectively used when there is no place where hot water is used. Compared with steam, warm water has a smaller amount of heat, and there are problems such as a decrease in temperature during remote transportation.

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.

[0006]

The hot water warmed by the exhaust heat is vaporized to become more vaporized even if the temperature is the same because the jacket is connected to the suction means to reduce the pressure. 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, and the same members as those in the conventional example are designated by the same reference numerals.

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,
Cooling water tank 4 and vacuum pump 1 as suction means
Make a cogeneration with 2.

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. The low-pressure steam pipe 5 is connected to a low-pressure steam use point (not shown). A water supply pipe 17 is connected to the cooling water tank 4 to supply cooling water.

The upper space 16 of the cooling water tank 4 and the vacuum pump 12 are connected by a pipe 18. The vacuum pump 12 includes an ejector 21 including a nozzle 19 and a diffuser 20,
It is composed of a centrifugal pump 22 as a circulation pump. The pipe 18 connects the upper space 16 of the cooling water tank 4 with the suction chamber of the nozzle 19. The suction port side of the centrifugal pump 22 is connected to the water reservoir of the cooling water tank 4 by a pipe 23. On the other hand, the outlet of the diffuser 20 is connected by a pipe 25 to a hot water recovery unit (not shown). By driving the spiral pump 22, the water in the cooling water tank 4 is supplied from the pipe 25 to the hot water recovery unit through the nozzle 19 and the diffuser 20. A suction force is generated by the water passing through the nozzle 19 to bring the upper space 16 into a decompressed state and also the decompressed state inside the jacket portion 3 through the upper communication pipe 15.

Next, the operation will be described. A suction force is generated in the nozzle 19 by driving the spiral pump 22 to pass water through the ejector 21, so that the upper space 16 of the cooling water tank 4, the upper communication pipe 15, and the inside of the jacket 3 are, for example, large. A reduced pressure state below atmospheric pressure can be achieved. The cooling water supplied from the lower communication pipe 13 to the jacket part 3 is heat-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 depressurized state from the inside of the jacket portion 3, the hot water immediately vaporizes to become steam and reaches the upper space 16 and is supplied to the low pressure steam use portion through the pipe 5. 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 nozzle 19 is the nozzle 1
It can be controlled by adjusting the temperature of the water passing through 9. That is, since the suction force of the nozzle 19 is generated only up to the saturated pressure of the passing fluid temperature, it is possible to increase the suction force by increasing the passing fluid temperature to increase the degree of pressure reduction.

[0013]

According to the present invention, since the jacket portion is depressurized by the suction means, a larger amount of steam is generated, 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.

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

[Explanation of symbols]

 1 Gas Engine 2 Generator 3 Jacket 4 Cooling Water Tank 5 Low Pressure Steam Pipe 12 Vacuum Pump 13 Lower Communication Pipe 15 Upper Communication Pipe 16 Upper Space 19 Nozzle 21 Ejector 22 Swirl 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. An evaporative cooling engine for cogeneration, characterized in that it is connected to a suction means for maintaining the decompression state.