JPH05125905A - Koji energy equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a cogeneration system 2 that does not require a heat dissipation device. [Structure] An output detection device 28 is provided in the generator 4 constituting the cogeneration device 2, and the temperature of hot water flowing through the hot water return path 6 is detected in the middle of the hot water return path 6 from the hot water tank 7 to the generator 4. A temperature detector 29 is provided, and an output detection signal 30 from the output detection device 28 and a temperature detection signal 31 from the temperature detector 29 are input to output the output of the generator 4 and the temperature of the hot water detected by the temperature detector 29. When is higher than the upper limit value, the switches 23, 24, 25 and 26 are switched to the commercial power source 1 side in the order of low priority, and the output of the generator 4 and the temperature of the hot water detected by the temperature detector 29 are detected. Is lower than the specified value, switching commands 32, 3 for switching the switching devices 23, 24, 25, 26 to the generator 4 side in descending order of priority.
An arithmetic and control unit 36 for outputting 3, 34 and 35 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cogeneration system in which a heat dissipation device can be eliminated.

[0002]

2. Description of the Related Art In recent years, a cogeneration power generation device having higher energy efficiency than conventional power generation devices has been developed.

The cogeneration system generates electric power by driving a generator using a drive device such as an engine or a gas turbine, and at the same time, heat exchange of exhaust gas generated in the engine or gas turbine or heat of a casing or the like. The cogeneration system is suitable for use as a private power generation facility because it is generally small in size.

FIG. 3 shows an example of cogeneration. When there are a large number of loads that require electric power, the loads are not shown in the figure, but are divided into a commercial power source load a and a cogeneration load a. Separately, the commercial power source 1 is connected to the commercial power source load a, and the cogeneration device 2 is connected to the cogeneration load a.

The cogeneration unit 2 includes a drive unit 3 such as an engine equipped with a built-in heat exchanger (not shown), a generator 4 connected to the drive shaft of the drive unit 3, and the drive unit 3. A hot water storage tank 7 connected to an attached / built-in heat exchanger via a hot water feed passage 5 and a hot water return passage 6, and a separate hot water feed passage 8 and hot water return passage 9 for the heat exchanger. The hot water storage tank 7 is connected to the heat utilization facility 13 via the hot water feed path 11 and the hot water return path 12.

The hot water storage tank 7 is connected to an auxiliary boiler 16 via a hot water feed passage 14 and a hot water return passage 15.

Reference numeral 17 is a transformer provided on the commercial power source 1 side, and 18 is a power supply line from the generator 4 to the cogeneration load a.

The commercial power source load a is used by the electric power supplied from the commercial power source 1, and the cogeneration load a is used by the electric power supplied from the cogeneration device 2. The device 2 includes a generator 4 driven by a drive device 3 such as an engine or a gas turbine.
To generate power to supply power to the cogeneration load a.

On the other hand, the exhaust gas generated by the drive unit 3 and the heat of the casing and the like are recovered as hot water by a heat exchanger (not shown) attached to and built in the drive unit 3, and the hot water storage tank 7 is supplied through the hot water feed passage 5. Is stored in the hot water storage tank 7, a part of which is circulated from the hot water return path 6 to the heat exchanger, the temperature is raised in the heat exchanger, and the hot water is returned to the hot water storage tank 7.

The hot water in the hot water storage tank 7 is taken out to the hot heat utilization equipment 13 through the hot water feed passage 11 and can be appropriately used from the hot heat utilization equipment 13 side.

When there is no heat demand in the heat utilization facility 13, the temperature of the hot water in the hot water storage tank 7 rises more than necessary, so that the excess hot water is transferred from the heat exchanger to the hot water feed line 8
It is sent to the radiator 10 through the radiator and is radiated by the radiator 10.

Further, when the temperature of the hot water generated by the drive unit 3 is insufficient with respect to the heat demand of the heat utilization facility 13, the auxiliary boiler 16 can be used for additional heating. There is.

[0013]

However, the above conventional cogeneration system has the following problems.

That is, in the cogeneration system 2,
In general, the power supply to the cogeneration load a is prioritized, so it is necessary to continue the operation of the cogeneration device 2 even when there is no heat demand in the heat utilization facility 13, and as a result, the drive device. The radiator 10 must be provided so that the excess heat generated in 3 can be released, and the entire equipment was redundant equipment.

In view of the above-mentioned circumstances, the present invention is directed to a radiator 1
It is an object of the present invention to provide a cogeneration system in which 0s are unnecessary and the cogeneration system can be integrated.

[0016]

According to the present invention, a heat exchanger attached to a drive device 3 and a hot water storage tank 7 are connected via a hot water feed passage 5 and a hot water return passage 6, and the drive device is connected. 3 is connected to a generator 4 for supplying electric power to a plurality of cogeneration load a, and power supply lines 19, 20, from the generator 4 to each cogeneration load a,
Switching devices 23, 24, 25, 26 for switching between the output of the generator 4 and the commercial power source 1 are provided in the middle of 21, 22, respectively, and the generator 4 is provided with an output detection device 28.
A temperature detector 29 for detecting the temperature of the hot water flowing through the hot water return path 6 is provided in the middle of the hot water return path 6, and the output detection device 2
When the output detection signal 30 from 8 and the temperature detection signal 31 from the temperature detector 29 are input and the output of the generator 4 and the temperature of the hot water detected by the temperature detector 29 are higher than the upper limit value, The switches 23, 24, 25, 26 are switched to the commercial power source 1 side in the order of priority, and when the output of the generator 4 and the temperature of the hot water detected by the temperature detector 29 are lower than the specified value, the switches are switched. Switching commands 32, 33, 34 for switching the generators 23, 24, 25, 26 to the generator 4 side in descending order of priority.
The present invention relates to a cogeneration system characterized in that an arithmetic and control unit 36 for outputting 35 is provided.

[0017]

According to the present invention, the arithmetic and control unit 36 inputs the output detection signal 30 from the output detection unit 28 and the temperature detection signal 31 from the temperature detector 29, and switches commands 32, 33,
34 and 35 are output, and the output of the generator 4 and the temperature detector 29
When the temperature of the hot water detected by is higher than the upper limit value, the switches 23, 24, 25 and 26 are switched to the commercial power source 1 side in ascending order of priority, and the output of the generator 4 and the temperature detector 29 are changed. When the detected temperature of the hot water is lower than the specified value, the switches 23, 24, 25 and 26 are switched to the generator 4 side in descending order of priority.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the present invention.

Further, in the figure, the same components as those in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted, and only the configuration unique to the present invention will be described below.

A switch 2 for switching between the cogeneration system 2 and the commercial power supply 1 in the middle of the power supply lines 19, 20, 21, and 22 from the cogeneration system 2 to each of the plurality of cogeneration loads a.
The switching board 27 is configured by providing 3, 24, 25, and 26.

The generator 4 is provided with an output detector 28 such as an ammeter or a voltmeter, and a temperature is provided in the hot water return path 6 from the hot water tank 7 to the heat exchanger attached to and incorporated in the drive unit 3. A detector 29 is provided, and an output detection signal 30 from the output detection device 28 and a temperature detection signal 31 from the temperature detector 29 are provided.
The arithmetic and control unit 36 for each of the switching devices 23, 24, 25, 26 by sending the switching command 32, 33, 34, 35 individually.
To provide.

The switches 23, 24, 25, and 26 are given priorities, and in this embodiment, the priorities of the switches 23, 24, 25, and 26 are lowered for the sake of convenience. ..

Further, the output of the cogeneration system 2 is adapted to change according to the load fluctuation of the cogeneration load a. In the figure, 37 is a temperature setting device and 38 is an output setting device.

Next, the operation will be described.

The operation of the cogeneration system 2 itself is the same as that of FIG.

The commercial power supply loader must be the commercial power supply 1
It is designed to be used by the electric power supplied from.

The cogeneration load a is adapted to be used by either one of the electric power supplied from the cogeneration device 2 and the electric power supplied from the commercial power source 1, and each switching device 23, 24, 25,
26 is a switching command 32, 33, 3 from the arithmetic and control unit 36.
It can be individually switched to any of the above at 4, 35.

Then, the cogeneration device 2 is driven according to the electric power demand of the cogeneration load a, the hot water generated in the cogeneration device 2 is sent to the hot water storage tank 7, and the hot water stored in the hot water storage tank 7 is used as a heat utilization facility. While being used in 13, the temperature of the hot water returned from the hot water storage tank 7 to the drive device 3 via the hot water return path 6 is low, or the temperature of the hot water is maintained within a predetermined temperature range. A temperature detector 29 provided in the middle of the path 6 detects the temperature of the hot water flowing through the hot water return path 6, sends a temperature detection signal 31 from the temperature detector 29 to the arithmetic and control unit 36, and sends the temperature and control signal to the arithmetic and control unit 36. By monitoring the temperature of the hot water flowing through the hot water return path 6, it is possible to detect the heat demand in the heat utilization facility 13.

Therefore, if the following control is performed, it is possible to perform the operation corresponding to the heat demand in the heat utilization facility 13 and the power demand in the cogeneration load a at the same time.

Prior to the control, the temperature setter 37 is used to provide the arithmetic and control unit 36 with an upper limit value and a prescribed value of the temperature of the hot water flowing through the hot water return path 6 (a margin for hunting prevention is subtracted from the upper limit value). A value slightly lower than the obtained upper limit value or an optimum value is input, and the upper limit value and the specified value (the margin for preventing hunting from the upper limit value of the output of the generator 4 are input to the output setter 38. Input a value that is slightly lower than the calculated upper limit value or an optimum value).

Simultaneously with the start of operation of the cogeneration system 2, the arithmetic and control unit 36 detects the temperature detection signal 31 of the temperature of the hot water flowing through the hot water return path 6 detected by the temperature detector 29 and the output detection unit 28. The output detection signal 30 of the output of the generator 4 is monitored, and as shown in the flowchart of FIG. 2, it is checked whether the voltage of the generator 4 is 0. When the voltage of the generator 4 is 0, the cogeneration is Since it is not in a state where it can supply power to the load a,
In the initial state, the switching commands 32, 33, 34, 35 are sent to all the switching devices 23, 24, 25, 26, and the switching devices 23, 24, 25, 26 are sent.
After switching 24, 25, and 26 to the side of the commercial power source 1, the process returns to the beginning and proceeds to the next when the voltage of the generator 4 is not zero.

Next, the arithmetic and control unit 36 checks whether the output of the generator 4 does not exceed the upper limit value. If the output of the generator 4 does not exceed the upper limit value, the operation proceeds to the next step. If the output exceeds the upper limit value, it means that the generator 4 is overloaded. Therefore, the switcher having the lowest priority among the switches 23, 24, 25 and 26 on the generator 4 side. After switching 26, 25, 24 and 23 to the commercial power source 1 side, the process returns to the beginning.

As a result, the load on the cogeneration system 2 is reduced and the generator 4 is prevented from being overloaded.

If the output of the generator 4 does not exceed the upper limit value, the arithmetic and control unit 36 checks whether the temperature of the hot water flowing through the hot water return path 6 exceeds the upper limit value, and the temperature of the hot water reaches the upper limit value. If the temperature does not exceed the value, the process proceeds to the next step. If the temperature of the hot water exceeds the upper limit value, it means that the heat demand in the heat utilization facility 13 has disappeared. Therefore, the switches 23, 24 on the generator 4 side, After switching the switcher 26, 25, 24, 23 having the lowest priority among the 25, 26 to the commercial power source 1 side, the process returns to the beginning.

As a result, the load on the cogeneration system 2 is reduced, excess hot water is prevented from being generated, and a radiator or other radiator is not required.

When the temperature of the hot water does not exceed the upper limit value, the arithmetic and control unit 36 further checks whether the temperature of the hot water does not exceed the specified value, and the temperature of the hot water does not exceed the specified value. If it does not exceed, the process proceeds to the next step. If the temperature of the hot water exceeds the specified value, it means that the operating condition of the cogeneration system 2 is appropriate compared with the heat demand in the heat utilization facility 13, so the process returns to the beginning. ..

When the temperature of the hot water does not exceed the specified value, the arithmetic and control unit 36 checks whether the output of the generator 4 does not exceed the specified value, and the output of the generator 4 does not exceed the specified value. If the value exceeds the value, it means that the operating condition of the cogeneration system 2 is appropriate compared with the power demand of the cogeneration load a, so the process returns to the beginning as it is, and the output of the generator 4 becomes the specified value. If it does not exceed, it means that the output of the generator 4 still has a margin up to the specified value. Therefore, the switching device with the highest priority among the switching devices 23, 24, 25 and 26 on the commercial power supply 1 side. After switching the devices 23, 24, 25, 26 to the generator 4 side, the process returns to the beginning.

After that, the above is repeated.

By doing so, the heat utilization facility 1
It becomes possible to obtain an optimum operating state that simultaneously corresponds to the heat demand in No. 3 and the power demand in the cogeneration load a, and no excess hot water is generated, so a radiator or other heat dissipation device is not required. ..

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0042]

As described above, according to the cogeneration system of the present invention, it is possible to obtain an optimum operating state that simultaneously responds to the heat demand in the heat utilization facility 13 and the power demand in the cogeneration load a. As a result, the surplus hot water is not generated, and the excellent effect that the cogeneration device 2 that does not require a heat dissipation device can be obtained can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic system diagram of an embodiment of the present invention.

FIG. 2 is a flowchart showing an operating state of the control device of FIG.

FIG. 3 is a schematic system diagram of a conventional example.

[Explanation of symbols]

 1 Commercial power supply 2 Cogeneration device 3 Drive device (heat exchanger) 4 Generator 5 Hot water feed path 6 Hot water return path 7 Hot water storage tank 19, 20, 21, 22 Power supply line 23, 24, 25, 26 Switch 28 Output Detection device 29 Temperature detector 30 Output detection signal 31 Temperature detection signal 32, 33, 34, 35 Switching command 36 Arithmetic control device Icogeneration load

Claims (1)

[Claims] 1. A heat exchanger attached to the drive device 3 and a hot water storage tank 7 are connected via a hot water feed passage 5 and a hot water return passage 6, and the drive device 3 is provided with a plurality of cogeneration loads. The generator 4 for supplying the electric power to the a is connected, and the output of the generator 4 and the commercial power source 1 are provided in the middle of the electric power supply lines 19, 20, 21, and 22 from the generator 4 to the loads a for cogeneration. Switching devices 23 and 2 for switching between
4, 25 and 26 are provided, respectively, an output detection device 28 is provided in the generator 4, and a temperature detector 29 for detecting the temperature of the hot water flowing through the hot water return path 6 is provided in the middle of the hot water return path 6 and the output is provided. Output detection signal 30 from the detection device 28
And the temperature detection signal 31 from the temperature detector 29, and when the output of the generator 4 and the temperature of the hot water detected by the temperature detector 29 are higher than the upper limit value, the switches 23, 24,
25 and 26 are switched to the commercial power source 1 side in ascending order of priority, and when the output of the generator 4 and the temperature of the hot water detected by the temperature detector 29 are lower than the specified value, the switches 23 and 2
A cogeneration system characterized in that an arithmetic and control unit 36 is provided for outputting switching commands 32, 33, 34, 35 for switching 4, 25, 26 to the generator 4 side in descending order of priority.