JP2002191139A - Hybrid generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hybrid generation system capable of continuously supplying electric power generated by a generator to a load, and of automatically switching its power source to a power company to supply the power to the load if the generator stops for some reason. SOLUTION: This hybrid generation system comprises a plurality of low- voltage diesel engine generators 1 and 2 which generates electric power by synchronous driving and continuously supplies the power to the load; a high- voltage receiving facility 3 which transforms high-voltage power from the power company to low-voltage power; and an automatic load switching device 4 which is provided on the power supply lines from the diesel engine generators 1 and 2 to the load and from the high-voltage receiving facility to the load, and which automatically switches the power source from the diesel engine generators 1 and 2 to the high-voltage receiving facility 3 if the power supply from the diesel engine generators 1 and 2 to the load is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to, for example, facilities such as hospitals, hotels, factories, etc., and always supplies power generated by a generator to a load side when the generator stops for some reason. And a hybrid generation system that automatically switches to power from a power company and supplies power to a load side.

[0002]

2. Description of the Related Art For example, in facilities such as hospitals, hotels, factories, etc., when power supplied from a power company is stopped (power outage) due to an accident or the like, equipment in the facilities is stopped, which has a great effect on consumers. receive. Particularly in hospitals, it is inevitable that medical equipment stops and affects the human body.

[0003] Therefore, conventionally, in a facility such as a hospital, a cogeneration system is installed, and when power supplied from a power company is stopped due to an accident or the like,
It drives the emergency generator and supplies electricity to the minimum emergency load to avoid crisis.

In the co-generation system, as shown in FIG. 5, a high-voltage power of 6,600 V is constantly transmitted from a power company to a high-voltage power receiving facility (cupicle) a, and dropped to a low voltage of 200 V or 100 V in the high-voltage power receiving facility a. Are supplied to various electric devices d as loads via a distribution board c in the facility b.

A plurality of high-pressure diesel engine generators e that synchronize (cooperate) with each other on the primary side of the high-voltage power receiving equipment a are installed. The engine generator e is driven as an emergency to generate electric power and supply electricity to a minimum emergency load.

[0006] Also, the co-generation system
Even at the peak load of the used electric power, the high-pressure diesel engine generator e is driven to save electric energy. FIG.
Represents a power load curve used, the horizontal axis represents time, and the vertical axis represents KW. FIG. 7 shows a heat load curve (cooling / heating / hot water supply), the horizontal axis represents time, and the vertical axis represents Kcal. Peak load of power consumption is 7
From 18:00 to 18:00, the heat load curve (cooling / heating / hot water supply) is from 8:00 to 18:00.

[0007] At the peak load of the electric power used, the high-pressure diesel engine generator e is driven, electric energy is introduced to save energy, and thermal energy is saved by utilizing the exhaust heat of the generator e. Part A of FIG. 6 is a part saving electric energy, part B of FIG. 7 is a part saving heat energy,
The high pressure diesel engine generator e is driven only during the peak load.

[0008]

However, the conventional cogeneration system has the following problems. (A) Since the high-pressure diesel engine generator is connected to the high-pressure side (primary side) of the high-voltage power receiving equipment, it is necessary to apply for permission to the electric power company and to cooperate with the electric power company. (B) The equipment cost is high and the primary side is affected by distribution line accidents. (C) When a power outage occurs on the power company side, the back electromotive force prevention device operates, the generator is also stopped, and facilities such as hospitals, hotels, factories, and the like are temporarily shut down. (D) The equipment cost as a measure for the above (c) is large, complicated, and danger due to high pressure, and legally requires management equipment personnel. (E) The management cost of the high-pressure diesel engine generator increases,
The cost to maintenance companies increases, and it is legally required to rebuild the engine every year. (F) Since the high-pressure diesel engine generator is frequently stopped and started, incomplete combustion occurs in the cylinder,
The degree of pollution increases. (G) After a certain period of time, the engine overhaul is carried out to carry out legal inspection work and is returned to the factory for overhaul, resulting in an increase in cost.

The present invention has been made in view of the above circumstances, and its object is to provide, for example, a hospital, a hotel,
Installed in a facility such as a factory, the power generated by the generator is always supplied to the load side, and when the generator stops for any reason, the power is automatically switched to the power from the power company and the power is supplied to the load side. To provide a safe and economical hybrid generation system that is not affected by a temporary power outage.

[0010]

According to the present invention, in order to achieve the above object, a first aspect of the present invention is a method for generating a plurality of low-voltages by driving synchronously to generate electric power and constantly supplying electric power to a load side of electric power. A diesel engine generator, a high-voltage power receiving facility for converting high-voltage power from a power company into low-voltage power, a power supply path from the diesel engine generator to the load side, and a power supply path from the high-voltage power receiving facility to the load side And an automatic load switching device that is automatically provided when the power supply from the diesel engine generator to the load side is stopped and the power supply from the high-voltage power receiving equipment to the load side is stopped. And a hybrid generation system. According to a second aspect of the present invention, the diesel engine generator according to the first aspect includes a water heat exchanger that exchanges heat with its cooling water, and the hot water obtained by heat exchange with the water heat exchanger is a high-temperature water heat storage tank. Is supplied to the inlet side of one or more air conditioning and hot water supply facilities via
The outlet side of the air-conditioning / hot water supply facility is returned to the water heat exchanger via a low-temperature water heat storage tank. According to a third aspect, the diesel engine generator according to the second aspect includes an exhaust gas heat exchanger that exchanges heat with the exhaust gas, and the exhaust gas heat exchanger is provided between the water heat exchanger and the high-temperature water heat storage tank. Is provided in the middle of the hot water circulation path. A fourth aspect of the present invention is characterized in that the air conditioning and hot water supply equipment of the second aspect is a hot water type air conditioning equipment, a hot water supply equipment, a floor heating equipment, a hot water pool equipment, and the like installed in the facility on the load side of the electric power. .

According to the above configuration, the electric power generated by the diesel engine generator is normally supplied to the load side. It is rare that the diesel engine generator breaks down. However, if the diesel engine generator stops for some reason, the automatic load switching device is activated, and the power is supplied to the load side by switching from the generator side to the power company side. That is, electricity is automatically transmitted from the power company to the demand side without a power outage, which is effective in facilities that can be affected even by a temporary power outage, such as hospitals, hotels, and factories.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The schematic configuration of the hybrid generation system will be described with reference to FIG. 1. The hybrid generation system includes first and second diesel engine generators 1 and 2 that are driven synchronously and generate a low voltage (100 V or 200 V). In addition, high-voltage power (6,60
0 V) to a low-voltage power (100 V or 200 V).

The first and second diesel engine generators 1 and 2 are connected to a power supply 4a of the automatic load switching device 4 and the high voltage power receiving equipment 3 is connected to a power company side power supply 4b of the automatic load switching device 4. ing. The switching contact plate 7 for switching between the power generation side power supply 4a and the power company side power supply 4b is connected to the distribution board 6 of the facility 5 as a load side via the existing wiring 8. The facility 5 is, for example, a hospital, a hotel, a factory, or the like, and is connected to various electric devices such as a lighting device, an electric heating device, and an air conditioner via a distribution board 6.

The first and second diesel engine generators 1 and 2 are constantly operating and supply the generated power to the facility 5 via the automatic load switching device 4. When the diesel engine generators 1 and 2 stop, the automatic load switching device 4 operates instantaneously, switches from the power generation side power supply 4a to the power company side power supply 4b, and the electric power from the high-voltage power receiving equipment 3 The power is supplied to the facility 5 via the uninterrupted power supply.

Next, the specific configuration of the hybrid generation system will be described. The configuration is as shown in FIG. Since the first and second diesel engine generators 1 and 2 have the same structure, the first diesel engine generator 1 will be described. The diesel engine unit 10 and the diesel engine unit 10 are driven to generate power. It comprises a power generating unit 11 and a cooling water for cooling the diesel engine unit 10 and a jacket heat exchanger 12 as a water heat exchanger for exchanging heat.

The diesel engine unit 10 includes the underground oil storage tank 1
Fuel is supplied from 3 via a supply tank / return tank 14, and is operated continuously for 24 hours. The power generation unit 11 generates 200 V power by driving the diesel engine unit 10, and this power is supplied to the power generation base 15. Here, the power generation base 15
Is connected to the power generation unit 11 of the first and second diesel engine generators 1 and 2 independently so as to be connected to the first unit as an input unit.
A power generation base 15a and a second power generation base 15b are provided, and an output base 15c is connected to a power generation side power supply 4a of the automatic load switching device 4.

The outlet side 16a of the hot water pipe 16 of the jacket heat exchanger 12 in the first diesel engine generator 1 is connected to the inlet side 17a of the high temperature water storage tank 17, and the outlet side 17b is connected to the hot water circulation pump 18. It is connected to a plurality of air conditioning / hot water supply equipments 19 via the control unit. The high-temperature water heat storage tank 17 may have a built-in electric heater as necessary, and may be heated by supplying electric power to the electric heater with electric power generated by the first diesel engine generator 1.

The air conditioning / hot water supply equipment 19 is, for example, a hot water type air conditioning equipment 20, a hot water supply equipment 21, a floor heating equipment 22, a hot water pool equipment 23 and the like, and the heat exchangers 20a, 21 of each equipment.
a, 22a, and 23a are connected in series. further,
The hot water outlet side of the air conditioning / hot water supply equipment 19 is connected to the inlet side 25 of the low temperature water heat storage tank 25 via the heat exchanger 24a of the cooling equipment 24.
a. Outlet side 2 of low-temperature water heat storage tank 25
5b is an inlet side 16b of the hot water pipe 16 in the jacket heat exchanger 12 of the first diesel engine generator 1.
To form a hot water circulation path 26.

The second diesel engine generator 2
Similarly, the hot water pipe 16 of the jacket heat exchanger 12 is also independently connected to the high-temperature water heat storage tank 17 and the low-temperature water heat storage tank 25.

Exhaust gas exhausted from the diesel engine units 10 of the first and second diesel engine generators 1 and 2 is discharged to the atmosphere via an exhaust gas pipe 27. An exhaust gas heat exchanger 28 and a silencer 29 are provided in the middle of the exhaust gas pipe 27.

The exhaust gas heat exchanger 28 is connected to a hot water pipe 16 connecting the jacket heat exchanger 12 and the high-temperature water heat storage tank 17. To be supplied.

The heat exchanger 20a of the hot water type air conditioner 20 as the air conditioner / hot water supply system 19 has a hot water circulation pump 3
It is connected to a hot water-fired absorption cold / hot water generator 32 via a hot water circulation pipe 31 having 0. The hot-water-absorption absorption-type cold / hot water generator 32 includes a cooling tower 33, and the hot-water-fired absorption-type cold / hot water generator 32 is connected to a plurality of fan coil units 35 via a cold / hot water pipe 34 to cool the room. It can be heated.

The heat exchanger 21a of the hot water supply equipment 21 is
A hot water circulation pipe 37 having a hot water circulation pump 36 on the way
Is connected to a hot water tank 38, and the hot water tank 38 is connected to a kitchen water heater 39 and a pool / bath water heater 40.

The heat exchanger 22a of the floor heating facility 22 is connected to a floor heating hot water pipe 43 via a hot water circulation pipe 42 having a hot water circulation pump 41 on the way.

The heat exchanger 23a of the hot water pool equipment 23 is
It is connected to a hot water pool 46 via a hot water circulation pipe 45 having a hot water circulation pump 44 and a filtration device 45a on the way.

Further, the heat exchanger 24a of the cooling equipment 24 is provided with a cooling water circulation pipe 48 having a cooling water pump 47 on the way.
Is connected to the cooling tower 49 via the.

Next, the operation of the hybrid generation system configured as described above will be described.
The high-voltage power (6,600 V) from the power company is transformed into low-voltage power (100 V or 200 V) by the high-voltage power receiving equipment 3 and supplied to the power company side power supply 4 b of the automatic load switching device 4.

The first and second diesel engine generators 1 and 2 operate synchronously and continuously for 24 hours, and the 200 V power generated by the power generator 11 is supplied to the automatic load switching device 4.
Is supplied to the power generation side power supply 4a. Now, since the switching contact plate 7 of the automatic load switching device 4 is connected to the power generation side power supply 4a, the power generated by the power generation unit 11 is supplied to the distribution board 6 of the facility 5 via the existing wiring 8, It is used as a power source for various electric equipment such as lighting equipment, electric heating equipment, and air conditioning equipment in the facility 5.

The first and second diesel engine generators 1 and 2 are provided with a jacket heat exchanger 12 which constantly exchanges heat with the cooling water of the engine unit 10. Is supplied to the high-temperature water heat storage tank 17 via the hot water storage tank 17, and is further supplied from the high-temperature water heat storage tank 17 to the hot water type air conditioner 20, the hot water supply equipment 21, the floor heating equipment 22, It is supplied to the pool facility 23.

Therefore, the exhaust heat of the first and second diesel engine generators 1.2 can be effectively used, and no fuel is required, and the system is a non-fluorocarbon heating / cooling / hot water supply system, and has clear environmental measures. Facilities.

Further, the first and second diesel engine generators 1 and 2 are continuously operated for 24 hours to provide a supply tank / return tank between the underground oil storage tank 13 as a fuel supply tank and the diesel engine unit 10. 14
To return the fuel to the engine section 10 and return, the returned fuel warms and returns. By repeating this, when the fuel is warmed and supplied into the cylinder, it becomes in a state where it is easily combusted, and completely burns without producing black smoke.
Moreover, by operating continuously for 24 hours, there is no temperature change in the cylinder, the temperature in the cylinder becomes constant, and the optimum conditions for complete combustion. Further, there is no metal fatigue of the diesel engine unit 10 and the life of the diesel engine unit 10 can be extended.

Therefore, the first and second diesel engine generators 1 and 2 are rarely out of order, but if stopped for any reason, the automatic load switching device 4 is activated and the switching contact plate 7 is turned on. The power is switched to the company-side power supply 4b, and 200V power is supplied from the high-voltage power receiving equipment 3 to the equipment 5 via the existing wiring 8.
Is supplied to the distribution board 6. That is, electricity is automatically transmitted from the power company to the demand side without a power outage, which is effective in facilities that can be affected even by a temporary power outage, such as hospitals, hotels, and factories. By checking and repairing and restarting the first and second diesel engine generators 1 and 2 while power is being supplied from the power company to the facility 5, power consumption from the power company can be reduced. ,
The economic effect is great.

FIG. 3 shows an electric power load curve of the hybrid generation system, in which the horizontal axis represents time and the vertical axis represents K.
FIG. 4 shows a heat load curve (cooling / heating / hot water supply), in which the horizontal axis represents time and the vertical axis represents Kcal. Since the first and second diesel engine generators 1 and 2 are continuously operated for 24 hours, the portion C is a portion in which all the electric power used is cut, and the portion E is an exhaust gas obtained by operating the portion D. It can be seen that this is a portion that is saved by heat, and that electric energy and heat energy are largely saved as compared with the related art.

In the above embodiment, the case where two diesel engine generators are driven synchronously has been described, but the number is not limited as long as the number of diesel engine generators is plural. . Also, the power generated by the diesel engine generator is 20
Although the voltage was set to 0 V, the voltage may be a low pressure of 400 V or less, and is not limited.

[0035]

As described above, according to the present invention, the following effects can be obtained. (A) Since the automatic load switching is performed at a low pressure, there is no need to apply for a permit to the electric power company and link the system with the electric power company, and the safety is high. (B) The facility cost is small and the secondary side is not affected by distribution line accidents. (C) Even if the diesel engine generator is stopped for some reason, the power is automatically switched to the electric power of the electric power company, so that there is no temporary blackout and business can be continued in facilities such as hospitals, hotels and factories. (D) Since the management cost of the diesel engine generator is low, it is inexpensive, there is no need to request a special maintenance company, and the engine can be overhauled once every four to five years. (E) Since the diesel engine generator is operated continuously for 24 hours, the fuel is completely burned in the cylinder, and the degree of pollution is extremely small. (F) It is more economical than overhaul by securing and replacing the engine as a fixture.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a hybrid generation system according to a first embodiment of the present invention.

FIG. 2 is an overall configuration diagram of a hybrid generation system of the embodiment.

FIG. 3 is a diagram showing a used power load curve of the embodiment.

FIG. 4 is a heat load curve diagram of the embodiment.

FIG. 5 is a schematic configuration diagram of a conventional cogeneration system.

FIG. 6 is a conventional power load curve diagram.

FIG. 7 is a conventional heat load curve diagram.

[Explanation of symbols]

 1, 2 Diesel engine generator 3 High voltage receiving equipment 4 Automatic load switching device 5 Facility (load side) 12 Jacket heat exchanger 17 High temperature water storage tank 19 Air conditioning / hot water supply equipment 25 Low temperature water storage tank

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) F02G 5/04 F02G 5/04 V H02J 3/38 H02J 3/38 E

Claims (4)

[Claims] 1. A plurality of low-voltage diesel engine generators that generate power by driving synchronously and constantly supply power to a load side of the power, and a high-voltage power receiving facility that converts high-voltage power from a power company into low-voltage power Provided in the middle of a power supply path from the diesel engine generator to the load side and a power supply path from the high-voltage power receiving equipment to the load side, and the power supply from the diesel engine generator to the load side is stopped. An automatic load switching device that automatically switches the power supply from the high-voltage power receiving equipment to the load side when the power generation is performed. 2. The diesel engine generator includes a water heat exchanger that exchanges heat with its cooling water, and the hot water obtained by heat exchange by the water heat exchanger is supplied through a high-temperature water heat storage tank to the diesel engine generator. The air-conditioning / hot-water supply facility is connected to an inlet side of a plurality of air-conditioning / hot-water supply facilities, and an outlet side of the air-conditioning / hot-water supply facility returns to the water heat exchanger via a low-temperature water heat storage tank. Hybrid generation system. 3. The diesel engine generator includes an exhaust gas heat exchanger that exchanges heat with its exhaust gas, the exhaust gas heat exchanger comprising a hot water circulation path between the water heat exchanger and a high-temperature water heat storage tank. The hybrid generation system according to claim 2, wherein the hybrid generation system is provided in the middle of (1). 4. The air conditioning / hot water supply facility is a hot water type air conditioning facility, a hot water supply facility, a floor heating facility, a hot water pool facility, or the like installed in a facility on a load side of the electric power. Hybrid generation system.