JPH06146811A - Output change-over controller for cogeneration - Google Patents

Abstract

PURPOSE:To facilitate the economical operation of cogeneration system. CONSTITUTION:A commercial power source 1 and the electric output 3a of a cogeneration system 2 are changed over through a changeover apparatus 5, and a water passing passage 7 between the heat exchanger 8 of the cogeneration system 2 and the heat exchanger 10 of a hot water boiler 9 is changed over through a change-over valve 11 to supply an electric load 6 and a thermal load 12. The load consuming quantity Wd of the electric load 6 is detected by an electric load detector 13, and the fuel flow rates Ff of the cogeneration system 2 and of the hot water boiler 9 are detected by a fuel flow rate detector 14, and an electric power rate and a fuel charge are severally converted into commercial electric power and computed in a computing section 15. Only in the case where the electric power rate is higher than the fuel charge, the cogeneration system 2 is automatically operated, and moreover the change- over apparatus 5 and the change-over valve 11 are changed over toward a generator 3 and the heat exchanger 8 to connectingly supply the electric output 3a and a waste heat recovering hot water 2a to the electric load 5 and the thermal load 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an output switching control device for a cogeneration system.

[0002]

2. Description of the Related Art Some conventional output switching control devices for cogeneration systems are constructed as follows, for example, as shown in FIG. That is, the power supply 1a of the commercial power supply 1 and the electric output 3a of the generator 3 of the cogeneration system 2 are switched by the switch 5 which is linked to the controller 4 of the cogeneration system 2, and the electric load 6 is switched to the above. Power supply 1a of commercial power supply 1
And the electric output 3a of the generator 3 of the cogeneration system 2 are selectively supplied. Further, the water passage 7 is switched to any one of the heat exchanger 8 of the cogeneration system 2 and the heat exchanger 10 of the hot water boiler 9 by the switching valve 11 associated with the controller 4, and the heat load 12 In addition, either the hot water 2a utilizing the exhaust heat of the cogeneration system 2 or the heated hot water 9a of the hot water boiler 9 is supplied. When the cogeneration system 2 is operating, the controller 4 of the cogeneration system 2 sets the switching device 5 and the switching valve 11 to the generator 3 side of the cogeneration system 2 and the heat of the switching valve 11. Switching to the side of the exchanger 8, the electric output 3a and the waste heat utilizing hot water 2a are connected and supplied to the electric load 6 and the heat load 12. On the contrary, when the cogeneration system 2 is stopped, the switching device 5 and the switching valve 11 are switched to the commercial power source 1 side and the hot water boiler 9 side to supply the supplied power 1a and heating. The hot water 9a is connected and supplied to the electric load 6 and the heat load 12.

[0003]

The above-mentioned conventional techniques have the following problems. When the cogeneration system 2 is operating, the switching device 5 and the switching valve 11 are switched regardless of the load consumption amount Wd of the electric load 6 and the fuel cost, and the generator 3 of the cogeneration system 2 is switched.
Of the electric output 3a of 2 and the hot water 2a using the waste heat of the heat exchanger 8,
The electric load 6 and the thermal load 12 are connected and supplied. On the other hand, the fuel cost to the electricity rate commensurate with the electric output 3a of the cogeneration system 2 has a larger ratio as the electric output 3a is smaller, and therefore the cogeneration system 2 has a small electric load 6 and a small electric output 3a. It is not economical to drive a car. The present invention is
Compare the electricity cost with the fuel cost, and automatically operate the cogeneration system only when the electricity cost is higher than the fuel cost to supply the generated power and hot water using exhaust heat, and when the power load is low, the cogeneration system An object is to enable economical operation of a cogeneration system by stopping operation, switching loads, and supplying electric power and heated hot water from a commercial power source.

[0004]

In order to achieve the above object, the present invention adds the following improved structure to the above prior art as shown in FIG. 1, for example. That is, the electric load detector 13 that detects the load consumption amount Wd of the electric load 6 is interposed between the switch 5 and the electric load 6. In addition, the cogeneration system 2 and the hot water boiler 9 are provided with a fuel flow rate detector 14 that detects the fuel flow rate Ff. Then, the electric load detector 13 and the fuel flow rate detector 14 are linked to the controller 4 of the cogeneration system 2. Further, in the cogeneration system 2, the load consumption amount Wd detected by the electric load detector 13 is used as an electricity charge, and the fuel flow rate Ff detected by the fuel flow rate detector 14 is used as a fuel cost. A calculator 15 is provided to convert and calculate by electric power. When the electricity price calculated by the calculation unit 15 is higher than the fuel cost, the controller 4 automatically operates the cogeneration system 2 and operates the switching device 5 and the switching valve 11. By switching to the generator 3 side and the heat exchange side 8 of the cogeneration system 2, the electric output 3a and the waste heat utilization hot water 2a are connected and supplied to the electric load 6 and the heat load 12. On the contrary, when the electricity charge is lower than the fuel cost, the switching device 5 and the switching valve 11 are switched to the commercial power source 1 side and the heat exchange boiler 10 side of the hot water boiler 9 to supply the electricity. The electric power 1a and the heated hot water 9a are connected and supplied to the electric load 6 and the heat load 12, and the cogeneration system 2 is automatically stopped.

[0005]

The present invention operates as follows. The cogeneration system 2 detects the load consumption amount Wd of the electric load 6 and the fuel flow rate Ff of the cogeneration system 2 by the electric load detector 13 and the fuel flow rate detector 14 which are linked to the controller 4. Then, the calculation unit 15 of the cogeneration system 2 converts the load consumption amount Wd and the fuel flow rate Ff into an electric charge and a fuel cost, respectively, which are converted into commercial electric power. When the electricity cost is higher than the fuel cost, the cogeneration system 2 is automatically operated, and the switching device 5 and the switching valve 1 are operated.
1 and generator 3 of its cogeneration system 2
Side and the heat exchange side 8 to switch the electric output 3a and the waste heat utilization hot water 2a to the electric load 6 and the heat load 1.
Connect and supply to 2. On the contrary, when the electricity charge is lower than the fuel cost, the switching device 5 and the switching valve 11 are switched to the commercial power source 1 side and the heat exchange boiler 10 side of the hot water boiler 9 to supply the electricity. Electric power 1a and heated hot water 9
a is connected to and supplied to the electric load 6 and the heat load 12, and the cogeneration system 2 is automatically stopped.

[0006]

The present invention has the following effects because it is constructed and operates as described above. The cogeneration system 2 detects the magnitude of the load consumption amount Wd and the fuel flow rate Ff, and the electricity rate of the load consumption amount Wd is the fuel flow rate Ff.
Only when the fuel cost is higher than f, the cogeneration system 2 is automatically operated, the load is switched, and the electric output 3a and the waste heat utilization hot water 2a are connected and supplied to the electric load 6 and the heat load 12. . This allows economical operation of the cogeneration system.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram of an output switching control device of a cogeneration system. In the figure, the power supply 1 of the commercial power supply 1
a and the electric output 3a of the generator 3 of the cogeneration system 2 are switched by the switching device 5 linked with the controller 4 of the cogeneration system 2 to supply the electric load 6 with the electric power 1a supplied from the commercial power source 1 Any one of the electric output 3a of the generator 3 of the cogeneration system 2 is selectively supplied. In addition, the water passage 7 is switched to either the heat exchanger 8 of the cogeneration system 2 or the heat exchanger 10 of the hot water boiler 9 by the switching valve 11 associated with the controller 4, and the heat load 1
2 is configured to supply either the hot water 2a using the exhaust heat of the cogeneration system 2 or the heated hot water 9a of the hot water boiler 9. In the cogeneration system 2, the generated heat quantity recovered in the waste heat utilizing hot water 2a by the heat exchanger 8 is calculated from the hot water inlet temperature, the hot water outlet temperature, and the hot water flow rate, and when it does not satisfy the required heat quantity of the heat load 12, The hot water boiler 9 is operated to switch to or supplement the heated hot water 9a. An electric load detector 1 for detecting the load consumption amount Wd of the electric load 6 between the switch 5 and the electric load 6.
3 is interposed. Further, the fuel flow rate Ff of the cogeneration system 2 and the hot water boiler 9 is increased.
A fuel flow rate detector 14 for detecting The fuel flow rate detector 14 is appropriately selected depending on whether the fuel of the cogeneration system 2 and the hot water boiler 9 is gas or kerosene, and when the hot water boiler 9 is an electric heater type. You can use a power meter. The electric load detector 13 and the fuel flow rate detector 14 are linked to the controller 4 of the cogeneration system 2. Furthermore, the above-mentioned cogeneration system 2
In the controller 4, the load consumption amount Wd detected by the electric load detector 13 is used as an electric charge, and the fuel flow rate Ff detected by the fuel flow rate detector 14 is used as a fuel cost.
Calculation unit 15 for converting and calculating with commercial power
Is provided. The cogeneration system 2
Can be directly controlled by the controller 4, for example,
A communication device 17 is connected to the controller 4 via a communication cable 16.
It is possible to connect a personal computer 18 provided with the above, and operate the controller 4 by utilizing the control command function of the computer 18 to perform automatic operation, automatic stop, and other controls. When the electricity charge calculated by the calculator 15 is higher than the fuel cost, the controller 4 automatically operates the cogeneration system 2 and operates the switching device 5 and the switching valve 11. By switching to the generator 3 side and the heat exchanger 8 side of the cogeneration system 2, the electric output 3a and the waste heat utilizing hot water 2a are connected and supplied to the electric load 6 and the heat load 12. . Conversely,
When the electricity charge is lower than the fuel cost, by switching the switching device 5 and the switching valve 11 to the commercial power source 1 side and the heat exchanger 10 side of the hot water boiler 9,
The power supply 1a and the heated hot water 9a are connected and supplied to the electric load 6 and the heat load 12, and the cogeneration system 2 is automatically stopped. The calculator 15 may be provided in the controller 4 instead of being provided in the controller 4.
The calculation function of 8 may be used.

[Brief description of drawings]

FIG. 1 is a system diagram of an output switching control device of a cogeneration system according to an embodiment of the present invention.

FIG. 2 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

1 ... Commercial power supply, 1a ... Supply power, 2 ... Cogeneration system, 2a ... Exhaust heat utilization hot water, 3 ... Generator, 3a
... electrical output, 4 ... controller, 5 ... switch, 6 ... electrical load,
7 ... Water passage, 8/10 ... Heat exchange bowl, 9 ... Hot water boiler, 9
a ... Heated hot water, 11 ... Switching valve, 12 ... Heat load, 13 ... Electric load detector, 14 ... Fuel flow rate detector, 15 ... Calculation unit,
Ff ... Fuel flow rate, Wd ... Load consumption.

Claims (1)

[Claims] 1. A power supply (1a) of a commercial power source (1) and an electric output of a generator (3) of a cogeneration system (2).
(3a) is switched by the switch (5) linked to the controller (4) of the cogeneration system (2), and the electric power (1) is supplied to the electric load (6) by the commercial power supply (1). And the electric output (3a) of the generator (3) of the cogeneration system (2) are selectively supplied, and the water passage (7) is connected to the cogeneration system (2).
Either the heat exchanger (8) of the above or the heat exchanger (10) of the hot water boiler (9) is switched by the switching valve (11) associated with the above controller (4), and the heat load (12) The hot water using the exhaust heat of the cogeneration system (2) (2a) and the hot water boiler
In the output switching control device of the cogeneration system configured to supply either the heated hot water (9a) of (9), between the switching device (5) and the electric load (6), Electric load detector for detecting load consumption (Wd) of load (6)
A fuel flow rate detector (14) for detecting the fuel flow rate (Ff) of the cogeneration system (2) and the hot water boiler (9) is provided with the electric load detector (13) interposed. ) And the above fuel flow rate detector (14)
And the controller of the cogeneration system (2)
In cooperation with (4), the cogeneration system (2) uses the load consumption amount (Wd) detected by the electric load detector (13) as an electric charge, and the fuel flow rate detector (14). The detected fuel flow rate (Ff) is used as fuel cost, and a calculation unit (15) for converting and calculating with commercial power is provided, and the controller (4) uses the electricity rate calculated by the calculation unit (15). Is higher than the fuel cost, the cogeneration system (2) is automatically operated and
The switching device (5) and the switching valve (11) are provided on the generator (3) side of the cogeneration system (2) and the heat exchanger.
By switching to the (8) side, the electric output (3a) and the waste heat utilization hot water (2a) are changed to the electric load (6) and the heat load.
When the electricity charge is lower than the fuel cost, the switching device (5) and the switching valve (11) are connected to the commercial power source (1) side and the hot water boiler (9). ) By switching to the heat exchanger (10) side, the supplied power (1a) and heated hot water (9a) are connected and supplied to the electric load (6) and the heat load (12), and the cogeneration is also performed. An output switching control device for a cogeneration system, characterized in that the system (2) is automatically stopped.