JP3094327B2 - Cogeneration system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bonnet-type engine-driven power generator, which supplies electric power by driving an engine and utilizes circulating cooling water on a primary side circulating between the engine and a radiator. The present invention relates to a cogeneration system having a heat exchanger for generating hot water such as cooling and heating and hot water supply on the secondary side.

[0002]

2. Description of the Related Art Conventionally, many cogeneration systems using an engine-driven generator have been proposed, such as Japanese Utility Model Laid-Open No. 4-49649, Japanese Utility Model Laid-Open No. 64-36554, and Japanese Utility Model Laid-Open No. 4-110341. As a prior art close to the present invention, Japanese Utility Model Laid-Open No. 4-110341 discloses a three-way automatic temperature control valve in a circulation flow path communicating between an engine driving a generator using an engine-driven generator and a radiator. There is disclosed an apparatus in which a heat exchanger is arranged in parallel with a radiator to supply hot water generated on the secondary side of the heat exchanger.

[0003]

However, in the case of a co-generation system in which the engine-driven generator, the radiator and the heat exchanger are housed in the same bonnet, the workability of installation and maintenance and inspection is improved. In consideration of the above, conventional general-purpose bonnet-type engine-driven power generators that are generally supplied on the market cannot be used, and the development of a bonnet with a new design is required, and the external dimensions are increased, Therefore, there arises a problem that a large installation space must be prepared.

[0004] In order to solve such a problem of installation space and the like, a device in which a heat exchanger is separately installed outside the bonnet is conceivable. In this case, the external dimensions of the bonnet do not need to be increased, but heat exchange is not required. In addition to the space for installing the heat exchanger, there are problems such as the workability of the piping between the engine generator inside the bonnet and the heat exchanger outside the bonnet and the securing of space for the piping in consideration of maintenance. However, problems such as installation space remain.

Since the demand for heat and the demand for electricity fluctuate depending on the season and time zone, the cooling water temperature of the water-cooled engine fluctuates. For example, when the demand for heat is low when the temperature of the cooling water is the highest and the demand for heat is low, the temperature of the cooling water rises and the hot water on the secondary side of the heat exchanger becomes too hot, and the engine also Overheated. Further, when the demand for heat is high when the demand for electricity is low when the temperature of the cooling water is low, the temperature of the cooling water decreases, and the temperature of the hot water on the secondary side of the heat exchanger becomes low. That is, the temperature of the secondary-side hot water of the heat exchanger fluctuates, which causes a problem in using the heat load. To cope with this, in the conventional technology, the flow rate of the cooling water circulating flow path between the radiator side and the heat exchanger side is controlled to change the two radiators at the same time. There has been a problem that control is particularly difficult when demand changes drastically.

In view of the above circumstances, the cogeneration system according to the present invention has been developed in consideration of the above circumstances, and the conventional bonnet type power generation system shown in FIG. A space located at the lower portion of the wind duct 2b and serving as a dead space from which the fuel tank 4 is removed is separated from a radiator cooling air passage, and an inner wall surface of the space is formed as a partition space subjected to a heat insulating treatment with a heat insulating material. By arranging peripheral equipment such as heat exchangers and piping materials in this space, conventional problems such as new design, larger size and installation space of the bonnet are eliminated, and furthermore, a general-purpose bonnet can be used. Construction time can be shortened, and it is possible to generate hot water with a stable temperature from the heat exchanger regardless of the demand for heat and the demand for electricity. That, it is an object of the present invention to provide a cogeneration system.

[0007]

The present invention is characterized in that a water-cooled engine-driven generator is provided in a hood and a radiator for radiating heat of cooling water of the water-cooled engine. And a heat exchanger for exchanging heat with the hot water of the engine cooling water, and a circulation path connecting the water-cooled engine, the radiator and the heat exchanger, wherein the circulation path The engine cooling water circulated from the water-cooled engine body to the heat exchanger determines whether to circulate to the engine body via the radiator or directly to the engine body based on the temperature of the circulating cooling water. A three-way automatic temperature control valve for switching the flow path is disposed, and the heat exchanger and the three-way automatic temperature control valve are located below the exhaust duct of the radiator in the bonnet. And is to the construction of arranging the partition space subjected to heat insulator on the inner wall surface.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cogeneration system according to the present invention having such a configuration will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of an embodiment of a cogeneration system according to the present invention, FIG. 2 is a perspective view for explaining main parts of FIG. 1, and FIG. 3 is a view of the embodiment of FIG. FIG. 4 is a cooling water circulation channel diagram for explaining the circulation of cooling water, and FIG. 4 is a partially cutaway perspective view of a conventional bonnet type engine-driven power generator. In the figure, reference numeral 1 denotes a cogeneration system, reference numeral 2 denotes an engine E, a generator G, a radiator R,
1 shows a hood for housing a heat exchanger H, a three-way automatic temperature control valve V, and peripheral devices for these devices.

As shown in FIG. 1, the inside of the hood 2 is blown by an engine room 2a in which an engine E, a generator G and a radiator R are housed, and a fan F for cooling cooling water circulating in the radiator R. Hood 2
An exhaust duct portion 2b for exhausting air to the outside, and the exhaust duct portion 2
b, heat exchanger H, three-way automatic temperature control valve V
And a heat exchanger section 2c as a partition space in which peripheral devices such as piping materials are arranged.

As shown in FIG. 4, the heat exchanger section 2c is provided with a fuel tank for driving the engine in a general-purpose bonnet type engine driven power generator.
When the cogeneration system 1 is used, a large-capacity fuel tank is usually installed outside of the cogeneration system assuming stationary operation, so that the fuel tank 4 from the beginning is removed to reduce dead space. Has become. And this heat exchanger part 2
In order to efficiently perform the heat exchange action of the heat exchanger H, a heat insulating material 3 for preventing heat radiation is attached to c.

Here, the piping path of the cogeneration system 1 and the heat exchange action will be described with reference to the cooling water circulation flow chart shown in FIG.

The cooling water discharged from the cooling water outlet E1 of the engine E and heated to a high temperature for cooling the engine E enters the primary cooling water inlet H1 of the heat exchanger H. The high-temperature cooling water exchanges heat with water passing from the secondary-side inlet H3 of the heat exchanger H to the secondary-side outlet H4 to perform hot water heating. At this time, the temperature is detected by a temperature sensor S1 attached to a cooling water outlet E1 of the engine E, and if cooling water having a temperature higher than a desired set temperature is supplied, the three-way automatic temperature control valve V is controlled to perform cooling. Water is circulated through the flow path to the radiator R, and is circulated to the bypass flow path B at or below the desired set temperature. Also, the temperature of the secondary side hot water of the heat exchanger H is stabilized with respect to the usage amount of the hot water of the heat exchanger H, that is, the demand for heat and the fluctuation of the load factor of the engine, that is, the demand for electricity.

That is, the outlet H4 on the secondary side of the heat exchanger H
When a large amount of hot water is not consumed, when passing through the primary cooling water outlet H2 from the primary cooling water inlet H1 of the heat exchanger H, the total temperature of the cooling water rises due to a small amount of heat radiation, The cooling water passes through the heat exchanger H by the temperature detection of the temperature sensor S1 and then passes through the outlet R1 from the inlet R1 of the radiator R. After the waste heat is generated by driving the fan F, the cooling water enters the cooling water inlet E2 of the engine E. I'm going back. When a large amount of hot water is consumed, heat exchanger H
When passing through, the temperature of the entire cooling water drops due to a large amount of heat radiation, and after the cooling water passes through the heat exchanger H by the temperature detection of the temperature sensor S1, the three-way automatic temperature adjustment is performed so as not to pass through the radiator R. By controlling the valve V, the three-way automatic temperature control valve V returns directly from the bypass port V2 to the cooling water inlet E2 of the engine E.

The present invention has a structure in which cooling water always passes on the primary side of the heat exchanger H, so that hot water can be supplied instantaneously when hot water is required. Maintenance of the equipment placed in the bonnet 2
The front cover 5 can be easily removed by detaching it. Further, as shown in FIG. 2, since the secondary inlet H3 and the secondary outlet H4 of the heat exchanger H are protruded from the side surface of the bonnet 2, the piping after installing the cogeneration system 1 is installed. The work is completed very easily within a short time.

[0016]

According to the cogeneration system of the present invention described above, the following effects can be obtained. (1) Even in the case of a bonnet-type engine-driven power generator that is conventionally supplied to the market as a general-purpose power supply, a space that is located below the radiator exhaust duct in the hood that houses the power generator and serves as a dead space is provided. By making the inner wall surface a space that has been subjected to heat insulation treatment with heat insulating material,
Peripheral devices such as a heat exchanger, a three-way automatic temperature control valve, and piping materials can be arranged in this space.Therefore, there is no need to consider the size and installation space due to the new design of the bonnet. It is possible to supply the cogeneration system using the bonnet. (2) In addition, since the heat exchanger and the like are intensively arranged in the space where the heat insulating material is mounted, separated from the radiator cooling air passage, heat radiation can be prevented and efficient heat utilization becomes possible. (3) Furthermore, external pipe connection after installation of the cogeneration system is completed only by connection with a flange or the like provided on the side of the bonnet, so that early operation after installation is possible. (4) Further, even if the demand for electricity and the demand for heat (hot water) fluctuate in seasons and time zones, it is possible to generate hot water with a stable temperature from the heat exchanger.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a cogeneration system according to the present invention.

FIG. 2 is a perspective view illustrating a main part of FIG.

FIG. 3 is a cooling water circulation flow chart illustrating the circulation of cooling water in the embodiment of FIG. 1;

FIG. 4 is a partially cutaway perspective view of a fuel tank part of a conventional bonnet type engine driven power generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cogeneration apparatus 2 Bonnet 2a Engine room 2b Air exhaust duct part 2c Heat exchanger part 3 Heat insulation material 4 Fuel tank 5 Front cover B Bypass passage E Engine E1 Cooling water outlet E2 Cooling water inlet F Fan G Generator H Heat Exchanger H1 Primary-side cooling water inlet H2 Primary-side cooling water outlet H3 Secondary-side inlet H4 Secondary-side outlet P Pump R Radiator R1 Inlet R2 Outlet V Three-way automatic temperature control valve V1 Radiator port V2 Bypass port

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yoichi Fujinami 2-8-65 Yoshinodai, Kawagoe-shi, Saitama Denyo Co., Ltd. Saitama Factory (56) References JP-A-2-99749 (JP, A) Japanese Utility Model Hei 5-1821 (JP, U) Japanese Utility Model Hei 1-125818 (JP, U) Japanese Utility Model Hei 6-58127 (JP, U) Japanese Utility Model Sho 64-36527 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F02G 5/04 F01P 3/20 F02B 63/04 F02B 77/11

Claims (1)

(57) [Claims] 1. A water-cooled engine-driven generator in a bonnet, a radiator for radiating heat of cooling water of the water-cooled engine, a heat exchanger for exchanging heat with the warmed engine cooling water, In a cogeneration system in which a water-cooled engine, a radiator and a circulation flow path connecting a heat exchanger are arranged, the circulation flow path is provided with engine cooling water circulated from a water-cooled engine body to a heat exchanger. A three-way automatic temperature control valve for selecting the circulation to the engine main body or the circulation directly to the engine main body based on the temperature of the circulating cooling water is disposed, the heat exchanger and the three-way The automatic temperature control valve is located below the exhaust duct of the radiator in the bonnet, and is disposed in a partition space provided with heat insulating material on its inner wall surface. Co-generation power generator.