JP5991156B2 - Boiler system - Google Patents

Description

  The present invention relates to a boiler system. More specifically, the present invention relates to a boiler system that controls the combustion state by proportional control.

2. Description of the Related Art Conventionally, as a boiler system that generates steam by burning a plurality of boilers, a so-called proportional control type boiler system that controls the generation amount of steam by continuously increasing or decreasing the combustion amount of the boiler has been proposed.
For example, in Patent Document 1, a boiler is divided into three load zones, a load increase zone, an optimum operation load zone, and a load decrease load zone, and the boiler is burned when burning in the load increase load zone. A control method of a proportional control boiler has been proposed in which the number of boilers is increased and the number of boilers to be burned is reduced when the boiler is burning in a load reduction zone. And in the control method of the proportional control boiler proposed by this patent document 1, after performing increase / decrease in the number of the boilers to burn, all the boilers which are burned are operated by the equal load factor.

Japanese Patent Laid-Open No. 11-132405

  Here, in the method proposed in Patent Document 1, when the boiler is burning in the number increase load zone or the number decrease load zone, the number of boilers to be uniformly burned is increased or decreased, and the number of boilers to be burned is increased or decreased. After performing the above, all the boilers that are burning are operated at an even load factor. Therefore, in the method proposed in Patent Document 1, there are cases where the boiler burns in the load reduction zone after the number increases, or the boiler burns in the load increase zone after the number decreases. And in such a case, since the increase / decrease in the number of the boilers to burn is repeated, boiler efficiency (thermal efficiency as a boiler system) will fall.

  Accordingly, an object of the present invention is to provide a boiler system that can be operated in a more efficient state of the boiler.

  The present invention is a boiler system including a boiler group including a plurality of boilers capable of burning by continuously changing a load factor, and a control unit that controls a combustion state of the boiler group according to a required load. The plurality of boilers include a first eco-operation zone that is in a load factor range in which the boiler efficiency is higher than the first threshold, and a second threshold that has a boiler efficiency lower than the first threshold and the first threshold. A second eco-operation zone that is a load factor range between and a normal operation zone that is a load factor range in which the boiler efficiency is lower than the second threshold value, and the second eco-operation zone The zones are an upper second eco-driving zone located in a range where the load factor is higher than the first eco-driving zone, and a lower second eco-operating zone located in a range where the load factor is lower than the first eco-driving zone. And comprising the normal operation The upper normal operation zone located in a range where the load factor is higher than the upper second eco-operation zone, and the lower normal operation zone located in a range where the load factor is lower than the lower second eco-operation zone And when the load factor of the boiler is in the upper normal operation zone for a first time and the number of boilers to be burned is increased by one, the control unit has already burned A determination unit that determines whether or not the load factor of the boiler that is being positioned is in the lower normal operation zone, and the load factor of the boiler that is already burning by the determination unit is not positioned in the lower normal operation zone The present invention relates to a boiler system including a boiler number control unit that increases the number of boilers to be burned by one when judged.

  In addition, the determination unit burns when the load factor of the boiler is located in the upper normal operation zone or the upper second eco-operation zone for a second time longer than the first time. When the number of boilers is increased by one, it is determined whether or not the load factor of the already burning boiler is located in the lower normal operation zone or the lower second eco-operation zone, and the number of boilers The control unit determines the number of boilers to be burned when the determination unit determines that the load factor of the boiler that has already been burned is not located in the lower normal operation zone or the lower second eco operation zone. It is preferable to increase the number of units.

  In addition, a minimum load factor that is a load factor in the smallest combustion state is set in the plurality of boilers, and the boiler number control unit, when increasing the number of boilers to be burned, It is preferable to burn at the minimum load factor.

  Further, when the number of boilers to be burned is increased, the boiler number control unit preferably burns a newly burned boiler at a load factor in the range of the lower second eco-operation zone.

  In addition, when the load factor of the boiler continues for the third time in a state where the boiler is located in the lower normal operation zone, the determination unit reduces the number of boilers to be burned and reduces the number of boilers to be burned. It is determined whether or not a load factor is located in the upper normal operation zone, and the boiler number control unit determines that the load factor of the boiler that continues combustion by the determination unit is not located in the upper normal operation zone. When it is determined, it is preferable to reduce the number of boilers to be burned by one.

  In addition, when the state where the load factor of the boiler is located in the lower normal operation zone or the lower second eco-operation zone continues for a fourth time longer than the third time, the determination unit, When the number of boilers to be burned is reduced by one, it is determined whether the load factor of the boiler that continues to burn is located in the upper normal operation zone or the upper second eco-operation zone, and the boiler number control When the determination unit determines that the load factor of the boiler that continues to burn is not located in the upper normal operation zone or the upper second eco-operation zone, the unit reduces the number of boilers to be burned by one. Is preferred.

  Moreover, this invention is a boiler system provided with the boiler group provided with the several boiler which can be burned by changing a load factor continuously, and the control part which controls the combustion state of the said boiler group according to a required load. The plurality of boilers include a first eco-operation zone that is within a load factor range in which the boiler efficiency is higher than the first threshold, and a second that has a boiler efficiency that is lower than the first threshold and the first threshold. A second eco-operation zone that is a load factor range between the threshold and a normal operation zone that is a load factor range where the boiler efficiency is lower than the second threshold, and the second The eco-friendly driving zone includes an upper second eco-friendly driving zone located in a range where the load factor is higher than the first eco-friendly driving zone, and a lower second eco-friendly zone located in a range where the load factor is lower than that of the first eco-friendly driving zone. An operation zone, and The operation zone is located in a range where the load factor is higher than that of the upper second eco-operation zone, and the control unit is in a case where the load factor of the boiler is located in the normal operation zone for a first time. The present invention relates to a boiler system that increases the number of boilers to be burned.

  Further, the control unit causes the boiler to burn when a state where the load factor of the boiler is located in the normal operation zone or the upper second eco-operation zone continues for a second time longer than the first time. When the number of boilers is increased by one, it is determined whether or not the load factor of the already burning boiler is positioned in the lower second eco-operation zone, and the load factor of the already burning boiler is When it is determined that it is not located in the lower second eco-operation zone, it is preferable to increase the number of boilers to be burned by one.

  Further, when the load factor of the boiler is in the lower second eco-operation zone for a fourth time, the control unit continues combustion when the number of boilers to be burned is decreased by one. It is determined whether or not the load factor of the boiler is positioned in the normal operation zone or the upper second eco-operation zone, and the load factor of the boiler that continues combustion is determined to be the normal operation zone or the upper second eco-operation zone. When it is determined not to be located in the zone, it is preferable to reduce the number of boilers to be burned by one.

  Moreover, this invention is a boiler system provided with the boiler group provided with the several boiler which can be burned by changing a load factor continuously, and the control part which controls the combustion state of the said boiler group according to a required load. The plurality of boilers include a first eco-operation zone that is within a load factor range in which the boiler efficiency is higher than the first threshold, and a second that has a boiler efficiency that is lower than the first threshold and the first threshold. A second eco-operation zone that is a load factor range between the threshold and a normal operation zone that is a load factor range where the boiler efficiency is lower than the second threshold, and the second The eco-friendly driving zone includes an upper second eco-friendly driving zone located in a range where the load factor is higher than the first eco-friendly driving zone, and a lower second eco-friendly zone located in a range where the load factor is lower than that of the first eco-friendly driving zone. An operation zone, and The operation zone is located in a range where the load factor is lower than the lower second eco-operation zone, and the control unit continues for a third time in a state where the load factor of the boiler is located in the normal operation zone The present invention also relates to a boiler system that reduces the number of boilers to be burned by one.

  In addition, the control unit causes combustion when a load factor of the boiler is in the normal operation zone or the lower second eco-operation zone for a fourth time longer than the third time. When the number of boilers is reduced by one, it is determined whether or not the load factor of the boiler that continues combustion is positioned in the upper second eco-operation zone, and the load factor of the boiler that continues to burn is determined by the upper second 2 When it is determined that the vehicle is not located in the eco-operation zone, it is preferable to reduce the number of boilers to be burned by one.

  Moreover, the said control part has already burned if the number of the boilers to burn is increased by one when the state where the load factor of the boiler is located in the upper second eco-operation zone continues for the second time. It is determined whether or not the load factor of the boiler is located in the normal operation zone or the lower second eco-operation zone, and the load factor of the boiler that has already been burned is determined in the normal operation zone or the lower second 2 When it is determined that the vehicle is not located in the eco-operation zone, it is preferable to increase the number of boilers to be burned by one.

  Moreover, this invention is a boiler system provided with the boiler group provided with the several boiler which can be burned by changing a load factor continuously, and the control part which controls the combustion state of the said boiler group according to a required load. The plurality of boilers include a first eco-operation zone that is within a load factor range in which the boiler efficiency is higher than the first threshold, and a second that has a boiler efficiency that is lower than the first threshold and the first threshold. A second eco-operation zone that is a load factor range between the threshold and a normal operation zone that is a load factor range where the boiler efficiency is lower than the second threshold, and the second The eco driving zone is located in a range where the load factor is lower than that of the first eco driving zone, the normal driving zone is located in a range where the load factor is lower than that of the second eco driving zone, and the control unit The boiler load factor is If the state is located in the normal operation zone continued third time, to a boiler system for reducing single a number of boilers to burn.

  In addition, the controller controls the number of boilers to be burned when a state in which the load factor of the boiler is located in the normal operation zone or the second eco operation zone continues for a fourth time longer than the third time. Is preferably reduced by one.

  Moreover, this invention is a boiler system provided with the boiler group provided with the several boiler which can be burned by changing a load factor continuously, and the control part which controls the combustion state of the said boiler group according to a required load. The plurality of boilers include a first eco-operation zone that is within a load factor range in which the boiler efficiency is higher than the first threshold, and a second that has a boiler efficiency that is lower than the first threshold and the first threshold. A second eco-operation zone that is a load factor range between the threshold and a normal operation zone that is a load factor range where the boiler efficiency is lower than the second threshold, and the second The eco driving zone is located in a range where the load factor is higher than that of the first eco driving zone, the normal driving zone is located in a range where the load factor is higher than that of the second eco driving zone, and the control unit The boiler load factor is If the state is located in the normal operation zone was continued first time, to a boiler system that increases a single a number of boilers to burn.

  In addition, the controller controls the number of boilers to be burned when a state in which the load factor of the boiler is located in the normal operation zone or the second eco-operation zone continues for a second time longer than the first time. Is preferably increased by one.

  According to the present invention, the boiler system can be operated in a state where the boiler efficiency is better.

It is a figure showing the outline of the boiler system concerning one embodiment of the present invention. It is a figure showing the outline of the boiler group concerning a 1st embodiment of the present invention. It is a figure which shows the outline of operation | movement of the boiler system of 1st Embodiment, and is the figure which showed an example of the state which increases the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 1st Embodiment, and is the figure which showed an example of the state which increases the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 1st Embodiment, and is the figure which showed the other example of the state which increases the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 1st Embodiment, and is the figure which showed the other example of the state which increases the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 1st Embodiment, and is the figure which showed an example of the state which reduces the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 1st Embodiment, and is the figure which showed an example of the state which reduces the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 1st Embodiment, and is the figure which showed the other example of the state which reduces the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 1st Embodiment, and is the figure which showed the other example of the state which reduces the number of boilers to burn. In 1st Embodiment, it is a flowchart which shows operation | movement of a boiler system in case the load factor of a boiler is located in an upper normal operation zone. In 1st Embodiment, it is a flowchart which shows operation | movement of a boiler system in case the load factor of a boiler is located in an upper side normal operation zone or an upper side 2nd eco-operation zone. In 1st Embodiment, it is a flowchart which shows operation | movement of a boiler system in case the load factor of a boiler is located in a lower normal operation zone. In 1st Embodiment, it is a flowchart which shows operation | movement of a boiler system in case the load factor of a boiler is located in a lower normal operation zone or a lower 2nd eco-operation zone. It is a figure which shows the outline of the boiler group which concerns on 2nd Embodiment of this invention. It is a figure which shows the outline of operation | movement of the boiler system of 2nd Embodiment, and is the figure which showed an example of the state which increases the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 2nd Embodiment, and is the figure which showed an example of the state which increases the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 2nd Embodiment, and is the figure which showed the other example of the state which increases the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 2nd Embodiment, and is the figure which showed the other example of the state which increases the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 2nd Embodiment, and is the figure which showed an example of the state which reduces the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 2nd Embodiment, and is the figure which showed an example of the state which reduces the number of boilers to burn. In 2nd Embodiment, it is a flowchart which shows operation | movement of a boiler system in case the load factor of a boiler is located in a normal operation zone. In 2nd Embodiment, it is a flowchart which shows operation | movement of a boiler system in case the load factor of a boiler is located in a normal operation zone or an upper 2nd eco-operation zone. In 2nd Embodiment, it is a flowchart which shows operation | movement of a boiler system in case the load factor of a boiler is located in a lower 2nd eco-operation zone. It is a figure which shows the outline of the boiler group which concerns on 3rd Embodiment of this invention. It is a figure which shows the outline of operation | movement of the boiler system of 3rd Embodiment, and is the figure which showed an example of the state which reduces the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 3rd Embodiment, and is the figure which showed an example of the state which reduces the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 3rd Embodiment, and is the figure which showed the other example of the state which reduces the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 3rd Embodiment, and is the figure which showed the other example of the state which reduces the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 3rd Embodiment, and is the figure which showed an example of the state which increases the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 3rd Embodiment, and is the figure which showed an example of the state which increases the number of boilers to burn. In 3rd Embodiment, it is a flowchart which shows operation | movement of a boiler system in case the load factor of a boiler is located in a normal operation zone. In 3rd Embodiment, it is a flowchart which shows operation | movement of a boiler system in case the load factor of a boiler is located in a normal operation zone or a lower 2nd eco-operation zone. In 3rd Embodiment, it is a flowchart which shows operation | movement of a boiler system in case the load factor of a boiler is located in the upper side 2nd eco-operation zone. It is a figure which shows the outline of the boiler group which concerns on 4th Embodiment of this invention. It is a figure which shows the outline of operation | movement of the boiler system of 4th Embodiment, and is the figure which showed an example of the state which reduces the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 4th Embodiment, and is the figure which showed an example of the state which reduces the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 4th Embodiment, and is the figure which showed the other example of the state which reduces the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 4th Embodiment, and is the figure which showed the other example of the state which reduces the number of boilers to burn. In 4th Embodiment, it is a flowchart which shows operation | movement of a boiler system in case the load factor of a boiler is located in a normal operation zone. In 4th Embodiment, it is a flowchart which shows operation | movement of a boiler system in case the load factor of a boiler is located in a normal operation zone or a 2nd eco-operation zone. It is a figure which shows the outline of the boiler group which concerns on 5th Embodiment of this invention. It is a figure which shows the outline of operation | movement of the boiler system of 5th Embodiment, and is the figure which showed an example of the state which increases the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 5th Embodiment, and is the figure which showed an example of the state which increases the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 5th Embodiment, and is the figure which showed the other example of the state which increases the number of boilers to burn. It is a figure which shows the outline of operation | movement of the boiler system of 5th Embodiment, and is the figure which showed the other example of the state which increases the number of boilers to burn. In 5th Embodiment, it is a flowchart which shows operation | movement of a boiler system in case the load factor of a boiler is located in a normal operation zone. In 5th Embodiment, it is a flowchart which shows operation | movement of a boiler system in case the load factor of a boiler is located in a normal operation zone or a 2nd eco-operation zone.

Hereinafter, preferred embodiments of the boiler system of the present invention will be described with reference to the drawings.
First, the overall configuration of the boiler system 1 of the present invention will be described with reference to FIG.
The boiler system 1 includes a boiler group 2 including a plurality of (five) boilers 20, a steam header 6 that collects steam generated in the plurality of boilers 20, and steam that measures the pressure inside the steam header 6. A pressure sensor 7 and a number control device 3 having a controller 4 that controls the combustion state of the boiler group 2 are provided.

The boiler group 2 produces | generates the vapor | steam supplied to the steam use installation 18 as a load apparatus.
The steam header 6 is connected to a plurality of boilers 20 constituting the boiler group 2 via a steam pipe 11. A downstream side of the steam header 6 is connected to a steam use facility 18 via a steam pipe 12.
The steam header 6 collects and stores the steam generated in the boiler group 2, thereby adjusting the pressure difference and pressure fluctuation of the plurality of boilers 20, and supplying the steam whose pressure is adjusted to the steam using facility 18. Supply.

  The vapor pressure sensor 7 is electrically connected to the number control device 3 via the signal line 13. The steam pressure sensor 7 measures the steam pressure inside the steam header 6 (steam pressure generated in the boiler group 2), and sends a signal (steam pressure signal) related to the measured steam pressure via the signal line 13. It transmits to the control apparatus 3.

  The number control device 3 is electrically connected to the plurality of boilers 20 through the signal line 16. The number control device 3 controls the combustion state of each boiler 20 based on the steam pressure inside the steam header 6 measured by the steam pressure sensor 7. Details of the number control device 3 will be described later.

The above boiler system 1 can supply the steam generated in the boiler group 2 to the steam using equipment 18 via the steam header 6.
The load required in the boiler system 1 (required load) is the amount of steam consumed in the steam using facility 18. The number control device 3 determines the fluctuation of the steam pressure inside the steam header 6 corresponding to the fluctuation of the steam consumption based on the steam pressure (physical quantity) inside the steam header 6 measured by the steam pressure sensor 7. The amount of combustion of each boiler 20 which comprises the boiler group 2 is calculated and controlled.

  Specifically, if the required load (steam consumption) increases due to an increase in demand for the steam use facility 18, and the amount of steam supplied to the steam header 6 is insufficient, the steam pressure inside the steam header 6 decreases. It will be. On the other hand, if the demand load (steam consumption) decreases due to a decrease in the demand for the steam use facility 18 and the amount of steam supplied to the steam header 6 becomes excessive, the steam pressure inside the steam header 6 increases. Become. Therefore, the boiler system 1 can monitor the fluctuation of the required load based on the fluctuation of the vapor pressure measured by the vapor pressure sensor 7. Then, the boiler system 1 calculates a necessary steam amount that is a steam amount required according to the consumed steam amount (required load) of the steam using facility 18 based on the steam pressure of the steam header 6.

Here, the several boiler 20 which comprises the boiler system 1 of this embodiment is demonstrated. FIG. 2 is a diagram showing an outline of the boiler group 2 according to the present embodiment.
The boiler 20 of this embodiment consists of a proportional control boiler which can be burned by changing the load factor continuously.
The proportional control boiler is a boiler in which the combustion amount can be continuously controlled at least in the range from the minimum combustion state S1 (for example, the combustion state at 20% of the maximum combustion amount) to the maximum combustion state S2. It is. The proportional control boiler adjusts the amount of combustion by, for example, controlling the opening degree (combustion ratio) of a valve that supplies fuel to the burner and a valve that supplies combustion air.

  Further, the continuous control of the combustion amount means that the calculation or signal in the local control unit 22 described later is a digital method and is handled in stages (for example, the output (combustion amount) of the boiler 20 in increments of 1%). Even when the output is controlled).

In the present embodiment, a minimum load factor R _min that is a load factor in the minimum combustion state S1 is set for the plurality of boilers 20. And the change of the combustion state between the combustion stop state S0 and the minimum combustion state S1 of the boiler 20 is controlled by turning on / off the combustion of the boiler 20 (burner). In the range from the minimum combustion state S1 to the maximum combustion state S2, the combustion amount can be controlled continuously.

In the present embodiment, the plurality of boilers 20 are respectively set with a first eco-operation zone Z1, a second eco-operation zone Z2, and a normal operation zone Z3.
The first eco-operation zone Z1 is a load factor range in which the boiler efficiency (the thermal efficiency of the boiler 20) is higher than the first threshold value (for example, 98%), and the most preferable load factor for burning the boiler 20 It is a range.

  The second eco-operation zone Z2 is a load factor range in which the boiler efficiency is between the first threshold value and a second threshold value (for example, 97%) lower than the first threshold value. As shown in FIG. 2, the second eco-driving zone Z2 includes an upper second eco-driving zone Z21 located in a range where the load factor is higher than that of the first eco-driving zone Z1, and a load that is greater than the first eco-driving zone Z1. A lower second eco-operation zone Z22 located in a low rate range.

  The normal operation zone Z3 is a load factor range in which the boiler efficiency is lower than the second threshold value. As shown in FIG. 2, the normal operation zone Z3 has an upper normal operation zone Z31 located in a higher load factor range than the upper second eco operation zone Z21 and a load factor higher than the lower second eco operation zone Z22. And a lower normal operation zone Z32 located in a lower range.

  Moreover, the priority order is set to each of the plurality of boilers 20. The priority order is used to select the boiler 20 that performs a combustion instruction or a combustion stop instruction. The priority order can be set, for example, using an integer value so that the lower the numerical value, the higher the priority order. As shown in FIG. 2, when the priorities of “1” to “5” are assigned to the first to fifth units of the boiler 20, the first unit has the highest priority, and the fifth unit has the highest priority. Lowest. In the normal case, this priority order is changed at predetermined time intervals (for example, 24 hour intervals) under the control of the control unit 4 described later.

The boiler 20 demonstrated above is provided with the boiler main body 21 in which combustion is performed, and the local control part 22 which controls the combustion state of the boiler 20, as shown in FIG.
The local control unit 22 changes the combustion state of the boiler 20 according to the required load. Specifically, the local control unit 22 controls the combustion state of the boiler 20 based on the number control signal transmitted from the number control device 3 via the signal line 16.
Further, the local control unit 22 transmits a signal used in the number control device 3 to the number control device 3 via the signal line 16. Examples of the signal used in the number control device 3 include an actual combustion state of the boiler 20 and other data.

Next, details of the number control device 3 will be described.
Based on the vapor pressure signal from the vapor pressure sensor 7, the number control device 3 calculates the required combustion amount of the boiler group 2 according to the required load and the combustion state of each boiler 20 corresponding to the required combustion amount, The number control signal is transmitted to the boiler 20 (local control unit 22). As shown in FIG. 1, the number control device 3 includes a storage unit 5 and a control unit 4.

  The storage unit 5 includes information on instructions given to each boiler 20 under the control of the number control device 3 (control unit 4), information such as the combustion state received from each boiler 20, and operation zones of the plurality of boilers 20. , Information on setting conditions of combustion patterns of the plurality of boilers 20, information on setting priority of the plurality of boilers 20, information on setting on changing priority (rotation), and the like.

  The control unit 4 gives various instructions to each boiler 20 via the signal line 16 and receives various data from each boiler 20 to control the combustion state and priority order of the five boilers 20. . When each boiler 20 receives a signal for changing the combustion state from the number control device 3, it controls the boiler 20 according to the instruction.

Here, details of control of the combustion state of the plurality of boilers 20 by the boiler system 1 of the present embodiment will be described. 3-10 is a figure which shows the outline of operation | movement of the boiler system 1 of this embodiment, respectively.
In this embodiment, the control part 4 is provided with the determination part 41 and the boiler number control part 42, as shown in FIG.
Whether the load factor of the plurality of boilers 20 is located in a predetermined operation zone, whether the load factor of the boiler 20 is located in the predetermined operation zone continues for a predetermined time, etc. Determine.
The boiler number control unit 42 increases or decreases the number of boilers 20 to be burned based on the determination result by the determination unit 41.

First, the operation of the control unit 4 when increasing the number of boilers 20 to be burned will be described with reference to FIGS.
In this case, the determination unit 41 determines the number of boilers 20 to be burned when the load factor of the boiler 20 is located in the upper normal operation zone Z31 for a first time (for example, 5 to 20 minutes) T1. When one unit is increased, it is determined whether or not the load factor of the boiler 20 that is already burning is positioned in the lower normal operation zone Z32.
Specifically, for example, as shown in FIG. 3, when the state in which the two boilers 20 of Unit 1 and Unit 2 are burning in the range of the upper normal operation zone Z31 continues for the first time T1, the determination When the boiler 41 combusts the three boilers 20 of No. 1 to No. 3 with the same load factor while maintaining the output of the boiler system 1, the load factor of the three boilers 20 becomes the lower normal operation zone Z32. Determine if it will be located.

The boiler number control unit 42 increases the number of boilers 20 to be burned by one when the determination unit 41 determines that the load factor of the boiler 20 that has already been burned is not located in the lower normal operation zone Z32.
Specifically, as shown in FIG. 4, when the three boilers 20 of Units 1 to 3 are burned at the same load factor, the load factor of the three boilers 20 is the lower second eco-operation. When it is located in the zone Z22, the first eco-operation zone Z1, the upper second eco-operation zone Z21 or the upper normal operation zone Z31 (here, it is located in the first eco-operation zone Z1), the number of boilers The control unit 42 burns the No. 3 boiler 20 and reduces the load factors of the No. 1 and No. 2 boilers 20 to burn the three boilers 20 at the same load factor.

Further, the determination unit 41 has a second time T2 in which the load factor of the boiler 20 is located in the upper normal operation zone Z31 or the upper second eco-operation zone Z21 is longer than the first time T1 (for example, 10 minutes to 20 minutes) When the number of boilers to be burned is increased by one, when the number of boilers to be burned is increased, the load factor of the boiler 20 that is already burned is located in the lower normal operation zone Z32 or the lower second eco-operation zone Z22. It is determined whether or not.
Specifically, for example, as shown in FIG. 5, when the two boilers 20 of No. 1 and No. 2 continue to burn in the upper second eco-operation zone Z21 for the second time T2. When the determination unit 41 burns the three boilers 20 of No. 1 to No. 3 at the same load factor while maintaining the output of the boiler system 1, the load factor of the three boilers 20 becomes the lower normal operation zone. It is determined whether or not the vehicle is located in Z32 or the lower second eco-operation zone Z22.

In this case, when it is determined by the determination unit 41 that the load factor of the boiler 20 that has already been burned is not located in the lower normal operation zone Z32 or the lower second eco operation zone Z22, Increase the number of boilers 20 to be burned.
Specifically, as shown in FIG. 6, when the three boilers 20 of No. 1 to No. 3 are burned at the same load factor, the load factor of the three boilers 20 is the first eco-operation zone Z1. Alternatively, when it is located in the upper second eco-operation zone Z21 (here, it is located in the first eco-operation zone Z1), the boiler number control unit 42 burns the No. 3 boiler 20 and 1 The load factors of the boilers 20 and 2 are reduced, and the three boilers 20 are burned at the same load factor.

  The “state in which the load factor of the boiler 20 is located in the upper normal operation zone Z31 or the upper second eco-operation zone Z21” means that the load factor continues to be located in the upper second eco-operation zone Z21 and the load factor is upper. This is a concept including a state in which the second eco-operation zone Z21 and the upper normal operation zone Z31 are moved up and down. Here, in the state where the load factor continues to be located in the upper normal operation zone Z31, the determination by the determination unit 41 is performed when the first time T1 shorter than the second time T2 has elapsed.

Next, the operation of the control unit 4 when reducing the number of boilers 20 to be burned will be described with reference to FIGS.
In this case, when the load factor of the boiler 20 is in the lower normal operation zone Z32 and the determination unit 41 continues for a third time T3 (for example, 5 minutes to 20 minutes), the number of boilers 20 to be burned is determined. When one is reduced, it is determined whether the load factor of the boiler 20 which continues combustion will be located in the upper normal operation zone Z31.
Specifically, for example, as shown in FIG. 7, the state in which the three boilers 20 of the No. 1 boiler 20 to the No. 3 boiler 20 are burning in the range of the lower normal operation zone Z32 is the third time T3. When it continues, the determination part 41 makes 1 each of the load factors of the boiler 20 (the boiler 1 of a high priority No. 1 and the boiler 20 of a No. 2 machine) which continues a combustion of the operation load factor S3 of the No. 3 boiler 20 with a low priority, respectively. It is determined whether or not the load factor of these two boilers 20 is located in the upper normal operation zone Z31 when it is increased by / 2.

In this case, when the determination unit 41 determines that the load factor of the boiler 20 that continues combustion is not located in the upper normal operation zone Z31, the number-of-boilers control unit 42 decreases the number of boilers 20 to be burned by one. .
Specifically, as shown in FIG. 8, the combustion of the No. 3 boiler 20 is stopped, and the load factor of the No. 1 and No. 2 boilers 20 is set to 1/2 of the operating load factor S3 of the No. 3 boiler 20 respectively. When increased, the two boilers 20 of Unit 1 and Unit 2 are moved to the upper second eco-operation zone Z21, the first eco-operation zone Z1, the lower second eco-operation zone Z22, or the lower normal operation zone Z32. When it will be located (here, it will be located in the lower second eco-operation zone Z22), the boiler number control unit 42 stops the combustion of the No. 3 boiler 20 and the No. 1 and No. 2 boilers. The load factor of 20 is increased by ½ of the operating load factor S3 of the No. 3 boiler 20, respectively.

Further, the determination unit determines that the load factor of the boiler 20 is in the lower normal operation zone Z32 or the lower second eco-operation zone Z22 for a fourth time T4 (for example, 10 minutes) longer than the third time T3. ~ 20 minutes) If the number of boilers 20 to be burned is decreased by one, the load factor of the boiler 20 that continues to burn is located in the upper normal operation zone Z31 or the upper second eco-operation zone Z21. It is determined whether or not.
Specifically, for example, as shown in FIG. 9, the state where the three boilers 20 of the No. 1 boiler 20 to the No. 3 boiler 20 are burning in the range of the lower second eco-operation zone Z22 is the fourth. When the time T4 is continued, the determination unit 41 determines the load factor of the boiler 20 (the first and second boilers 20 having higher priority) that continues to burn, the operation load factor S4 of the third boiler 20 having the lower priority, respectively. It is determined whether or not the load factor of these two boilers 20 is located in the upper normal operation zone Z31 or the upper second eco-operation zone Z21.

In this case, the boiler number control unit 42 causes the boiler to burn when it is determined by the determination unit 41 that the load factor of the boiler 20 that continues to burn is not located in the upper normal operation zone Z31 or the upper second eco-operation zone Z21. Decrease the number of 20 by one.
Specifically, as shown in FIG. 10, combustion of the No. 3 boiler 20 is stopped, and the load factor of the No. 1 and No. 2 boilers 20 is ½ each of the operating load factor S4 of the No. 3 boiler 20. When the number is increased, the two boilers 20 of No. 1 and No. 2 are located in the first eco-operation zone Z1, the lower second eco-operation zone Z22, or the lower normal operation zone Z32 ( Here, the boiler unit control unit 42 stops combustion of the No. 3 boiler 20 and sets the load factor of the No. 1 and No. 2 boilers 20 to No. 3 respectively. The operation load factor S4 of the boiler 20 is increased by half.

  Note that “the state in which the load factor of the boiler 20 is located in the lower normal operation zone Z32 or the lower second eco-operation zone Z22” means that the load factor continues to be located in the lower second eco-operation zone Z22. This is a concept including a state in which the rate goes up and down between the lower second eco-operation zone Z22 and the lower normal operation zone Z32. Here, in the state where the load factor continues to be located in the lower normal operation zone Z32, the determination by the determination unit 41 is performed when the third time T3 shorter than the fourth time T4 has elapsed.

Next, a specific example of the operation of the boiler system 1 of the present embodiment will be described with reference to FIGS. FIGS. 11-14 is a flowchart which shows operation | movement of the boiler system 1. FIG.
First, the operation of the boiler system 1 when the load factor of the boiler 20 is located in the upper normal operation zone Z31 will be described with reference to FIG.

  In this case, in step ST1, the determination unit 41 determines whether the time during which the load factor of the boiler 20 is located in the upper normal operation zone Z31 has continued for the first time T1. If the determination unit 41 determines that the time period in the upper normal operation zone Z31 has continued for the first time T1, the process proceeds to step ST2. If the determination unit 41 determines that the time period in the upper normal operation zone Z31 has not continued for the first time T1, the process returns to step ST1.

  In step ST2, when the number of boilers 20 to be burned is increased by one, the determination unit 41 determines whether or not the load factor of the boiler 20 that is already burning is located in the lower normal operation zone Z32. To do. Specifically, when all of the boilers 20 to be burned including the boiler 20 that newly starts combustion are burned at the same load factor, the determination unit 41 has the load factor of the boiler 20 in the lower normal operation zone Z32. It will be determined whether it will be located in. If the determination unit 41 determines that the load factor of the boiler 20 is not located in the lower normal operation zone Z32, the process proceeds to step ST3. If the determination unit 41 determines that the load factor of the boiler 20 is located in the lower normal operation zone Z32, the process returns to step ST1.

  In step ST3, the boiler number control unit 42 increases the number of boilers 20 to be burned by one, and ends the process. Specifically, the boiler number control unit 42 causes the boiler 20 to newly start combustion to burn at a predetermined load factor, and the load factor of the boiler 20 already burned corresponds to the predetermined load factor. All boilers 20 are burned at the same load factor. Also, the time counted for determination by the determination unit 41 in step ST1 is reset.

  In addition, after the number of boilers 20 to be burned is increased by one by the above processing, when the boiler 20 that has already burned is still located in the upper normal operation zone Z31, again from step ST1. It is determined whether or not the number of boilers 20 to be burned is further increased by the processing.

  Next, the operation of the boiler system 1 when the load factor of the boiler 20 is located in the upper normal operation zone Z31 or the upper second eco-operation zone Z21 will be described with reference to FIG.

  In this case, in step ST11, the determination unit 41 determines whether the time during which the load factor of the boiler 20 is located in the upper normal operation zone Z31 or the upper second eco-operation zone Z21 has continued for the second time T2. If the determination unit 41 determines that the time period in the upper normal operation zone Z31 or the upper second eco-operation zone Z21 has continued for the second time T2, the process proceeds to step ST12. If the determination unit 41 determines that the time period in the upper normal operation zone Z31 or the upper second eco-operation zone Z21 has not continued for the second time T2, the process returns to step ST11.

  In step ST12, when the determination unit 41 increases the number of boilers 20 to be burned, the load factor of the boiler 20 that has already been burned is positioned in the lower normal operation zone Z32 or the lower second eco-operation zone Z22. Determine whether or not to do so. Specifically, when all of the boilers 20 to be burned including the boiler 20 that newly starts combustion are burned at the same load factor, the determination unit 41 has the load factor of the boiler 20 in the lower normal operation zone Z32. Alternatively, it is determined whether or not the vehicle is positioned in the lower second eco-operation zone Z22. If the determination unit 41 determines that the load factor of the boiler 20 is not located in the lower normal operation zone Z32 or the lower second eco-operation zone Z22, the process proceeds to step ST13. If the determination unit 41 determines that the load factor of the boiler 20 is located in the lower normal operation zone Z32 or the lower second eco-operation zone Z22, the process returns to step ST11.

  In step ST13, the boiler number control unit 42 increases the number of boilers 20 to be burned, and ends the process. Specifically, the boiler number control unit 42 causes the boiler 20 to newly start combustion to burn at a predetermined load factor, and the load factor of the boiler 20 already burned corresponds to the predetermined load factor. All boilers 20 are burned at the same load factor. Further, the time counted for determination by the determination unit 41 in step ST11 is reset.

  When the number of boilers 20 to be burned is increased by one by the above processing, the boiler 20 that has already been burned is still located in the upper normal operation zone Z31 or the upper second eco-operation zone Z21. Again, it is determined whether or not the number of boilers 20 to be burned is further increased by the processing from step ST11.

  Next, the operation of the boiler system 1 when the load factor of the boiler 20 is located in the lower normal operation zone Z32 will be described with reference to FIG.

  In this case, in step ST21, the determination unit 41 determines whether the time during which the load factor of the boiler 20 is located in the lower normal operation zone Z32 has continued for the third time T3. If the determination unit 41 determines that the time period in the lower normal operation zone Z32 has continued for the third time T3, the process proceeds to step ST22. If the determination unit 41 determines that the time period in the lower normal operation zone Z32 has not continued for the third time T3, the process returns to step ST21.

  In step ST22, the determination part 41 will determine whether the load factor of the boiler 20 which continues combustion will be located in the upper side normal operation zone Z31, if the number of the boilers 20 to burn is decreased by one. Specifically, the determination unit 41 increases the load factor of the boiler 20 that continues combustion when the load factor of the boiler 20 that continues combustion is increased by an amount corresponding to the operating load factor of the boiler 20 that stops combustion. Is determined to be located in the upper normal operation zone Z31. When it is determined by the determination unit 41 that the load factor of the boiler 20 that continues combustion is not located in the upper normal operation zone Z31, the process proceeds to step ST23. When it is determined by the determination unit 41 that the load factor of the boiler 20 that continues combustion is positioned in the upper normal operation zone Z31, the process returns to step ST21.

  In step ST23, the boiler number control unit 42 decreases the number of boilers 20 to be burned by one, and ends the process. Specifically, the boiler number control unit 42 stops the combustion of one boiler 20, and increases the load factor of the boiler 20 that continues the combustion by an amount corresponding to the operation load factor of the boiler 20 that stops the combustion. . Further, the time counted for determination by the determination unit 41 in step ST21 is reset.

  In addition, after the number of boilers 20 to be burned is decreased by one by the above processing, when the boiler 20 that continues to burn is still located in the lower normal operation zone Z32, the process from step ST21 is performed again. It is determined whether the number of boilers 20 to be burned is further reduced by the processing.

  Next, the operation of the boiler system 1 when the load factor of the boiler 20 is located in the lower normal operation zone Z32 or the lower second eco-operation zone Z22 will be described with reference to FIG.

  In this case, in step ST31, the determination unit 41 determines whether the time during which the load factor of the boiler 20 is located in the lower normal operation zone Z32 or the lower second eco-operation zone Z22 continues for the fourth time T4. To do. When the determination unit 41 determines that the time period in the lower normal operation zone Z32 or the lower second eco-operation zone Z22 has continued for the fourth time T4, the process proceeds to step ST32. When it is determined by the determination unit 41 that the time located in the lower normal operation zone Z32 or the lower second eco-operation zone Z22 does not continue for the fourth time T4, the process returns to step ST31.

  In step ST32, when the determination unit 41 decreases the number of boilers 20 to be burned, the load factor of the boiler 20 that continues to burn is located in the upper normal operation zone Z31 or the upper second eco-operation zone Z21. It is determined whether or not. Specifically, the determination unit 41 increases the load factor of the boiler 20 that continues combustion when the load factor of the boiler 20 that continues combustion is increased by an amount corresponding to the operating load factor of the boiler 20 that stops combustion. Is positioned in the upper normal operation zone Z31 or the upper second eco-operation zone Z21. If the determination unit 41 determines that the load factor of the boiler 20 that continues to burn is not positioned in the upper normal operation zone Z31 or the upper second eco-operation zone Z21, the process proceeds to step ST33. When it is determined by the determination unit 41 that the load factor of the boiler 20 that continues combustion is located in the upper normal operation zone Z31 or the upper second eco-operation zone Z21, the process returns to step ST31.

  In step ST33, the boiler number control unit 42 decreases the number of boilers 20 to be burned by one and ends the process. Specifically, the boiler number control unit 42 stops the combustion of one boiler 20, and increases the load factor of the boiler 20 that continues the combustion by an amount corresponding to the operation load factor of the boiler 20 that stops the combustion. . Further, the time counted for determination by the determination unit 41 in step ST31 is reset.

  When the number of boilers 20 to be burned is reduced by one by the above processing, the boiler 20 that continues to burn is still located in the lower normal operation zone Z32 or the lower second eco-operation zone Z22. Therefore, it is determined again whether the number of boilers 20 to be burned is further reduced by the processing from step ST31.

  According to the boiler system 1 of this embodiment demonstrated above, there exist the following effects.

  (1) A plurality of boilers 20 are provided with a lower normal operation zone Z32, a lower second eco operation zone Z22, a first eco operation zone Z1, an upper second eco operation zone Z21, and an upper normal operation zone Z31. ,It was set. And, when the state where the load factor of the boiler 20 is located in the upper normal operation zone Z31 continues for the first time T1, the controller 4 is already burned when the number of boilers 20 to be burned is increased by one. A determination unit 41 that determines whether or not the load factor of the boiler 20 is positioned in the lower normal operation zone Z32, and the load factor of the boiler 20 that is already burned by the determination unit 41 is lower than the lower normal operation zone. A boiler number control unit 42 that increases the number of boilers to be burned by one when it is determined not to be located at Z32. Thereby, the boiler system 1 is made to burn by increasing the number of combustion of the boiler 20, when the boiler 20 which has already burned will burn in the lower normal operation zone Z32 with low boiler efficiency. The number of boilers 20 is not increased. Therefore, since the number of boilers 20 to be burned can be increased by increasing the number of boilers 20 burned in a state where the boilers 20 that have already been burned are in a better boiler efficiency, the boiler system 1 Driven with better boiler efficiency.

  (2) When the state in which the load factor of the boiler 20 is located in the upper normal operation zone Z31 or the upper second eco-operation zone Z21 continues for the second time T2, the determination unit 41 sets the number of boilers 20 to be burned. It was determined whether or not the load factor of the boiler 20 that was already burning would be located in the lower normal operation zone Z32 or the lower second eco-operation zone Z22 when the number of units was increased. When the determination unit 41 determines that the load factor of the boiler 20 that has already been burned is not located in the lower normal operation zone Z32 or the lower second eco-operation zone Z22, the boiler unit control unit 42 The number of boilers 20 to be increased was increased by one. Thereby, when the boiler 20 is mainly combusting in the upper second eco-operation zone Z21, the boiler system 1 increases the number of boilers 20 burned, so that the boiler 20 that has already been combusted improves boiler efficiency. If the combustion is to be performed in the lower normal operation zone Z32 or the lower second eco-operation zone Z22, the number of boilers 20 to be combusted is not increased. Therefore, even when the boiler 20 is combusting in the upper second eco-operation zone Z21, the boiler 20 that has already been combusted can be burned in a more efficient state by increasing the number of boilers 20 combusted. In addition, since the number of boilers 20 to be burned can be increased, the boiler system 1 can be operated with better boiler efficiency.

  (3) In the determination unit 41, when the load factor of the boiler 20 is located in the lower normal operation zone Z32 continues for the third time T3, the combustion is continued when the number of boilers 20 to be burned is decreased by one. It is determined whether or not the load factor of the boiler 20 to be positioned is in the upper normal operation zone Z31, and the boiler unit control unit 42 causes the load factor of the boiler 20 to continue combustion by the determination unit 41 to be in the upper normal operation zone. When it was determined that it was not located at Z31, the number of boilers to be burned was reduced by one. Thereby, the boiler system 1 reduces the number of combustion of the boiler 20, and when the boiler 20 which continues combustion will combust in the upper normal operation zone Z31 with low boiler efficiency, it is made to burn. Do not reduce the number of cars. Therefore, when the number of boilers 20 is reduced, the number of boilers 20 to be burned can be reduced when the boiler 20 that continues to burn is burned in a more efficient state of the boiler. Driven with good boiler efficiency.

  (4) The number of boilers 20 to be burned in the determination unit 41 when the load factor of the boiler 20 is located in the lower normal operation zone Z32 or the lower second eco-operation zone Z22 for the fourth time T4. When one is reduced, it is determined whether or not the load factor of the boiler 20 that continues combustion is positioned in the upper normal operation zone Z31 or the upper second eco-operation zone Z21. Then, when the determination unit 41 determines that the load factor of the boiler 20 that continues combustion is not located in the upper normal operation zone Z31 or the upper second eco-operation zone Z21, the boiler unit controller 42 causes the boiler 20 to burn. The number of cars was reduced by one. Thereby, when the boiler 20 is combusting mainly in the lower second eco-operation zone Z22, the boiler system 1 reduces the number of combustion of the boiler 20 so that the boiler 20 that continues combustion improves the boiler efficiency. In the case where combustion is to occur in the upper normal operation zone Z31 or the upper second eco-operation zone Z21, the number of boilers 20 to be burned is not reduced. Therefore, even when the boiler 20 is combusting in the lower second eco-operation zone Z22, the boiler 20 that continues to burn can be burned in a more boiler-efficient state by reducing the number of burners 20 Further, since the number of boilers 20 to be burned can be reduced, the boiler system 1 can be operated with better boiler efficiency.

Next, the boiler system 1 which concerns on 2nd Embodiment of this invention is demonstrated, referring FIGS. 15-24. The boiler system 1 of the second embodiment is different from the first embodiment mainly in the operation zone classification.
In the description after the second embodiment, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  Specifically, as shown in FIG. 15, in the second embodiment, the plurality of boilers 20 are set with a first eco-operation zone Z1, a second eco-operation zone Z2, and a normal operation zone Z3. ing. The second eco-operation zone Z2 includes an upper second eco-operation zone Z21 and a lower second eco-operation zone Z22. The normal operation zone Z3 has a load factor higher than that of the upper second eco-operation zone Z21. Located in the high range. That is, the boiler 20 of the second embodiment is different from the first embodiment in that it does not include a lower normal operation zone located in a range where the load factor is the lowest.

In the second embodiment, the control unit 4 (boiler number control unit 42) determines the number of boilers 20 to be burned when the load factor of the boiler 20 is in the normal operation zone Z3 for the first time T1. Increase one.
Specifically, as shown in FIG. 16, when the state in which the two boilers 20 of Unit 1 and Unit 2 are burning in the normal operation zone Z3 continues for the first time T1, the number-of-boilers control unit As shown in FIG. 17, the No. 42 burns the No. 3 boiler 20 and reduces the load factors of the No. 1 and No. 2 boilers 20 to burn the three boilers 20 at the same load factor.

Moreover, the control part 4 (determination part 41), when the load factor of the boiler 20 is in the normal operation zone Z3 or the upper second eco-operation zone Z21 continues for the second time T2, the boiler 20 to be burned When the number is increased by one, it is determined whether or not the load factor of the boiler 20 that is already burning is positioned in the lower second eco-operation zone Z22.
Specifically, for example, as shown in FIG. 18, when the two boilers 20 of No. 1 and No. 2 continue to burn in the upper second eco-operation zone Z21 for the second time T2. When the determination unit 41 burns the three boilers 20 of No. 1 to No. 3 with the same load factor while maintaining the output of the boiler system 1, the load factor of the three boilers 20 becomes the lower second eco. It is determined whether or not the vehicle is located in the operation zone Z22.

In this case, the boiler number control unit 42 determines the number of boilers 20 to be burned when the determination unit 41 determines that the load factor of the boiler 20 already burning is not located in the lower second eco-operation zone Z22. Increase one.
Specifically, as shown in FIG. 19, when the three boilers 20 of No. 1 to No. 3 are burned at the same load factor, the load factor of the three boilers 20 is the first eco-operation zone Z1. Alternatively, when it is located in the upper second eco-operation zone Z21 (here, it is located in the first eco-operation zone Z1), the boiler number control unit 42 burns the No. 3 boiler 20 and 1 The load factors of the boilers 20 and 2 are reduced, and the three boilers 20 are burned at the same load factor.

The control unit 4 (determination unit 41) sets the number of boilers 20 to be burned when the load factor of the boiler 20 is located in the lower second eco-operation zone Z22 for the fourth time T4. It is determined whether or not the load factor of the boiler 20 that continues combustion when it is decreased is positioned in the normal operation zone Z3 or the upper second eco-operation zone Z21.
Specifically, for example, as shown in FIG. 20, the state in which the three boilers 20 of the No. 1 boiler 20 to the No. 3 boiler 20 are burning in the range of the lower second eco-operation zone Z22 is the fourth. When the time T4 is continued, the determination unit 41 sets the load factor of the boiler 20 (the first and second boilers 20 having higher priorities) that continues combustion to the operating load factor S5 of the third boiler 20 having the lower priority, respectively. It is determined whether or not the load factor of these two boilers 20 is located in the normal operation zone Z3 or the upper second eco-operation zone Z21.

In this case, the boiler number control unit 42 causes the boiler 20 to burn when the determination unit 41 determines that the load factor of the boiler 20 that continues combustion is not located in the normal operation zone Z3 or the upper second eco-operation zone Z21. Decrease the number of units.
Specifically, as shown in FIG. 21, the combustion of the No. 3 boiler 20 is stopped, and the load factor of the No. 1 and No. 2 boilers 20 is ½ each of the operating load factor S4 of the No. 3 boiler 20. When increased, the two boilers 20 of Unit 1 and Unit 2 are located in the first eco-operation zone Z1 or the lower second eco-operation zone Z22 (here, the first eco-operation zone) The boiler number control unit 42 stops the combustion of the No. 3 boiler 20, and sets the load factor of the No. 1 and No. 2 boilers 20 to the operating load factor S5 of the No. 3 boiler 20, respectively. Increase by 1/2.

Next, operation | movement of the boiler system 1 of 2nd Embodiment is demonstrated, referring FIGS. 22-24.
First, the operation of the boiler system 1 when the load factor of the boiler 20 is located in the normal operation zone Z3 (see FIGS. 16 and 17) will be described with reference to FIG.

  In this case, in step ST41, the determination unit 41 determines whether the time during which the load factor of the boiler 20 is located in the normal operation zone Z3 has continued for the first time T1. If it is determined by the determination unit 41 that the time located in the normal operation zone Z3 has continued for the first time T1, the process proceeds to step ST42. When it is determined by the determination unit 41 that the time located in the normal operation zone Z3 does not continue for the first time T1, the process returns to step ST41.

  In step ST42, the number-of-boilers control unit 42 increases the number of boilers 20 to be burned and ends the process. Specifically, the boiler number control unit 42 causes the boiler 20 to newly start combustion to burn at a predetermined load factor, and the load factor of the boiler 20 already burned corresponds to the predetermined load factor. All boilers 20 are burned at the same load factor. Also, the time counted for determination by the determination unit 41 in step ST41 is reset.

  In addition, after increasing the number of boilers 20 to be burned by the above process, when the boiler 20 that has already been burned is still located in the normal operation zone Z3, the process from step ST41 is performed again. Thus, it is determined whether to further increase the number of boilers 20 to be burned.

  Next, the operation of the boiler system 1 when the load factor of the boiler 20 is located in the normal operation zone Z3 or the upper second eco-operation zone Z21 (see FIGS. 18 and 19) will be described with reference to FIG. To do.

  In this case, in step ST51, the determination unit 41 determines whether the time during which the load factor of the boiler 20 is located in the normal operation zone Z3 or the upper second eco-operation zone Z21 has continued for the second time T2. When it is determined by the determination unit 41 that the time located in the normal operation zone Z3 or the upper second eco-operation zone Z21 has continued for the second time T2, the process proceeds to step ST52. When it is determined by the determination unit 41 that the time in the normal operation zone Z3 or the upper second eco-operation zone Z21 has not continued for the second time T2, the process returns to step ST51.

  In step ST52, when the determination unit 41 increases the number of boilers 20 to be burned, whether or not the load factor of the boiler 20 that is already burning is positioned in the lower second eco-operation zone Z22. Determine. Specifically, when all the boilers 20 to be burned, including the boiler 20 that newly starts combustion, are burned at the same load factor, the determination unit 41 has a lower second eco-operation. It is determined whether or not it is located in the zone Z22. If the determination unit 41 determines that the load factor of the boiler 20 is not located in the lower second eco-operation zone Z22, the process proceeds to step ST53. When the determination unit 41 determines that the load factor of the boiler 20 is located in the lower second eco-operation zone Z22, the process returns to step ST51.

  In step ST53, the number-of-boilers control unit 42 increases the number of boilers 20 to be burned, and ends the process. Specifically, the boiler number control unit 42 causes the boiler 20 to newly start combustion to burn at a predetermined load factor, and the load factor of the boiler 20 already burned corresponds to the predetermined load factor. All boilers 20 are burned at the same load factor. Also, the time counted for determination by the determination unit 41 in step ST51 is reset.

  In addition, when the number of boilers 20 to be burned is increased by one by the above processing, the boiler 20 that is already burned is still located in the normal operation zone Z3 or the upper second eco-operation zone Z21. Again, it is determined whether or not the number of boilers 20 to be burned is further increased by the processing from step ST51.

  Next, the operation of the boiler system 1 when the load factor of the boiler 20 is located in the lower second eco-operation zone Z22 (see FIGS. 20 and 21) will be described with reference to FIG.

  In this case, in step ST61, the determination unit 41 determines whether the time during which the load factor of the boiler 20 is located in the lower second eco-operation zone Z22 has continued for the fourth time T4. When it is determined by the determination unit 41 that the time located in the lower second eco-operation zone Z22 has continued for the fourth time T4, the process proceeds to step ST62. When it is determined by the determination unit 41 that the time located in the lower second eco-operation zone Z22 does not continue for the fourth time T4, the process returns to step ST61.

  In step ST62, when the determination unit 41 decreases the number of boilers 20 to be burned, the load factor of the boiler 20 that continues to burn is located in the normal operation zone Z3 or the upper second eco-operation zone Z21. It is determined whether or not. Specifically, the determination unit 41 increases the load factor of the boiler 20 that continues combustion when the load factor of the boiler 20 that continues combustion is increased by an amount corresponding to the operating load factor of the boiler 20 that stops combustion. Is determined to be positioned in the normal operation zone Z3 or the upper second eco-operation zone Z21. If the determination unit 41 determines that the load factor of the boiler 20 that continues to burn is not positioned in the normal operation zone Z3 or the upper second eco-operation zone Z21, the process proceeds to step ST63. When it is determined by the determination unit 41 that the load factor of the boiler 20 that continues combustion is positioned in the normal operation zone Z3 or the upper second eco-operation zone Z21, the process returns to step ST61.

  In step ST63, the boiler number control unit 42 decreases the number of boilers 20 to be burned by one, and ends the process. Specifically, the boiler number control unit 42 stops the combustion of one boiler 20, and increases the load factor of the boiler 20 that continues the combustion by an amount corresponding to the operation load factor of the boiler 20 that stops the combustion. . Also, the time counted for determination by the determination unit 41 in step ST61 is reset.

  Note that, after the number of boilers 20 to be burned is reduced by one by the above processing, when the boiler 20 that continues to burn is still located in the lower second eco-operation zone Z22, step ST61 is performed again. It is determined whether or not the number of boilers 20 to be burned is further reduced by the processing from.

Next, the boiler system 1 which concerns on 3rd Embodiment of this invention is demonstrated, referring FIGS. 25-34.
In the third embodiment, as shown in FIG. 25, the plurality of boilers 20 are set with a first eco-operation zone Z1, a second eco-operation zone Z2, and a normal operation zone Z3. The second eco-operation zone Z2 includes an upper second eco-operation zone Z21 and a lower second eco-operation zone Z22, and the normal operation zone Z3 has a load factor higher than that of the lower second eco-operation zone Z22. Located in the lower range. That is, the boiler 20 of the third embodiment is different from the first embodiment in that it does not include the upper normal operation zone located in the range with the highest load factor.

In the third embodiment, the control unit 4 (boiler number control unit 42) determines the number of boilers 20 to be burned when the load factor of the boiler 20 is located in the normal operation zone Z3 for the third time T3. Decrease one.
Specifically, as shown in FIG. 26, when the state where the three boilers 20 of the No. 1 boiler 20 to the No. 3 boiler 20 are burning in the normal operation zone Z3 continues for the third time T3, As shown in FIG. 27, the boiler number control unit 42 stops the combustion of the No. 3 boiler 20 and sets the load factor of the No. 1 and No. 2 boilers 20 to 1 / of the operating load factor S6 of the No. 3 boiler 20, respectively. Increase by 2.

Further, the control unit 4 (determination unit 41) continues the fourth time T4 in which the load factor of the boiler 20 is located in the normal operation zone Z3 or the lower second eco-operation zone Z22 is longer than the third time T3. In this case, if the number of boilers 20 to be burned is reduced by one, it is determined whether or not the load factor of the boiler 20 that continues burning is positioned in the upper second eco-operation zone Z21.
Specifically, for example, as shown in FIG. 28, the state where the three boilers 20 of the No. 1 boiler 20 to the No. 3 boiler 20 are burning in the range of the lower second eco-operation zone Z22 is the fourth. When the time T4 is continued, the determination unit 41 sets the load factor of the boiler 20 (the first and second boilers 20 with higher priority) to continue the combustion, and the operating load factor S7 of the third boiler 20 with the lower priority. It is determined whether or not the load factor of these two boilers 20 is positioned in the upper second eco-operation zone Z21.

In this case, the control unit 4 (boiler number control unit 42) causes the boiler 20 to burn when the determination unit 41 determines that the load factor of the boiler 20 that continues to burn is not located in the upper second eco-operation zone Z21. Decrease the number of units.
Specifically, as shown in FIG. 29, the combustion of the No. 3 boiler 20 is stopped, and the load factor of the No. 1 and No. 2 boilers 20 is set to 1/2 of the operating load factor S7 of the No. 3 boiler 20, respectively. When increased, the two boilers 20 of Unit 1 and Unit 2 are located in the first eco-operation zone Z1 or the lower second eco-operation zone Z22 (here, the first eco-operation zone) The boiler number control unit 42 stops the combustion of the No. 3 boiler 20, and sets the load factor of the No. 1 and No. 2 boilers 20 to the operating load factor S7 of the No. 3 boiler 20, respectively. Increase by 1/2.

Further, the control unit 4 (determination unit 41) burns when the load factor of the boiler 20 is located in the upper second eco-operation zone Z21 for a second time T2 longer than the first time T1. When the number of boilers is increased by one, it is determined whether or not the load factor of the boiler 20 that is already burning is positioned in the normal operation zone Z3 or the lower second eco-operation zone Z22.
Specifically, for example, as shown in FIG. 30, when the two boilers 20 of No. 1 and No. 2 continue to burn in the upper second eco-operation zone Z21 for the second time T2. When the determination unit 41 burns the three boilers 20 of No. 1 to No. 3 with the same load factor while maintaining the output of the boiler system 1, the load factor of the three boilers 20 becomes the normal operation zone Z3 or It is determined whether or not the vehicle is positioned in the lower second eco-operation zone Z22.

In this case, the boiler number control unit 42 burns when the determination unit 41 determines that the load factor of the boiler 20 that has already been burned is not located in the normal operation zone Z3 or the lower second eco-operation zone Z22. Increase the number of boilers 20 by one.
Specifically, as shown in FIG. 31, when the three boilers 20 of No. 1 to No. 3 are burned at the same load factor, the load factor of the three boilers 20 is the first eco-operation zone Z1. Alternatively, when it is located in the upper second eco-operation zone Z21 (here, it is located in the first eco-operation zone Z1), the boiler number control unit 42 burns the No. 3 boiler 20 and 1 The load factors of the boilers 20 and 2 are reduced, and the three boilers 20 are burned at the same load factor.

Next, operation | movement of the boiler system 1 of 3rd Embodiment is demonstrated, referring FIGS. 32-34.
First, the operation of the boiler system 1 when the load factor of the boiler 20 is located in the normal operation zone Z3 (see FIGS. 26 and 27) will be described with reference to FIG.

  In this case, in step ST71, the determination unit 41 determines whether the time during which the load factor of the boiler 20 is located in the normal operation zone Z3 has continued for the third time T3. If it is determined by the determination unit 41 that the time located in the normal operation zone Z3 has continued for the third time T3, the process proceeds to step ST72. When the determination unit 41 determines that the time period in the normal operation zone Z3 has not continued for the third time T3, the process returns to step ST71.

  In step ST72, the boiler number control unit 42 decreases the number of boilers 20 to be burned by one, and ends the process. Specifically, the boiler number control unit 42 stops the combustion of one boiler 20, and increases the load factor of the boiler 20 that continues the combustion by an amount corresponding to the operation load factor of the boiler 20 that stops the combustion. . Also, the time counted for determination by the determination unit 41 in step ST71 is reset.

  If the number of boilers 20 to be burned is reduced by one by the above process and the boiler 20 that continues to burn is still located in the normal operation zone Z3, the process from step ST71 is performed again. It is determined whether the number of boilers 20 to be burned is further reduced.

  Next, the operation of the boiler system 1 when the load factor of the boiler 20 is located in the normal operation zone Z3 or the lower second eco-operation zone Z22 (see FIGS. 28 and 29) with reference to FIG. explain.

  In this case, in step ST81, the determination unit 41 determines whether the time during which the load factor of the boiler 20 is located in the normal operation zone Z3 or the lower second eco-operation zone Z22 continues for the fourth time T4. If the determination unit 41 determines that the time in the normal operation zone Z3 or the lower second eco-operation zone Z22 has continued for the fourth time T4, the process proceeds to step ST82. When it is determined by the determination unit 41 that the time located in the normal operation zone Z3 or the lower second eco-operation zone Z22 does not continue for the fourth time T4, the process returns to step ST81.

  In step ST <b> 82, the determination unit 41 determines whether or not the load factor of the boiler 20 that continues combustion is positioned in the upper second eco-operation zone Z <b> 21 when the number of boilers 20 to be burned is decreased by one. To do. Specifically, the determination unit 41 increases the load factor of the boiler 20 that continues combustion when the load factor of the boiler 20 that continues combustion is increased by an amount corresponding to the operating load factor of the boiler 20 that stops combustion. Is determined to be located in the upper second eco-operation zone Z21. When it is determined by the determination unit 41 that the load factor of the boiler 20 that continues combustion is not located in the upper second eco-operation zone Z21, the process proceeds to step ST83. When it is determined by the determination unit 41 that the load factor of the boiler 20 that continues combustion is positioned in the upper second eco-operation zone Z21, the process returns to step ST81.

  In step ST83, the boiler number control unit 42 reduces the number of boilers 20 to be burned by one and ends the process. Specifically, the boiler number control unit 42 stops the combustion of one boiler 20, and increases the load factor of the boiler 20 that continues the combustion by an amount corresponding to the operation load factor of the boiler 20 that stops the combustion. . Further, the time counted for determination by the determination unit 41 in step ST81 is reset.

  When the number of boilers 20 to be burned is reduced by one by the above processing, the boiler 20 that continues to burn is still in the normal operation zone Z3 or the lower second eco-operation zone Z22. Again, it is determined whether or not the number of boilers 20 to be burned is further reduced by the processing from step ST81.

  Next, the operation of the boiler system 1 when the load factor of the boiler 20 is located in the upper second eco-operation zone Z21 (see FIGS. 30 and 31) will be described with reference to FIG.

  In this case, in step ST91, the determination unit 41 determines whether the time during which the load factor of the boiler 20 is located in the upper second eco-operation zone Z21 has continued for the second time T2. When it is determined by the determination unit 41 that the time located in the upper second eco-operation zone Z21 has continued for the second time T2, the process proceeds to step ST92. When it is determined by the determination unit 41 that the time located in the upper second eco-operation zone Z21 does not continue for the second time T2, the process returns to step ST91.

  In step ST92, when the determination unit 41 increases the number of boilers 20 to be burned, the load factor of the boiler 20 that is already burning is positioned in the normal operation zone Z3 or the lower second eco-operation zone Z22. It is determined whether or not. Specifically, when all the boilers 20 to be burned including the boiler 20 that newly starts combustion are burned at the same load factor, the determination unit 41 sets the load factor of the boiler 20 to the normal operation zone Z3 or lower. It is determined whether or not the vehicle is located in the second eco-friendly zone Z22. If the determination unit 41 determines that the load factor of the boiler 20 is not located in the normal operation zone Z3 or the lower second eco-operation zone Z22, the process proceeds to step ST93. If the determination unit 41 determines that the load factor of the boiler 20 is located in the normal operation zone Z3 or the lower second eco-operation zone Z22, the process returns to step ST91.

  In step ST93, the number-of-boilers control unit 42 increases the number of boilers 20 to be burned by one and ends the process. Specifically, the boiler number control unit 42 causes the boiler 20 to newly start combustion to burn at a predetermined load factor, and the load factor of the boiler 20 already burned corresponds to the predetermined load factor. All boilers 20 are burned at the same load factor. Further, the time counted for determination by the determination unit 41 in step ST91 is reset.

  Note that, after the number of boilers 20 to be burned is increased by the above processing, if the boiler 20 that is already burned is still positioned in the upper second eco-operation zone Z21, step ST91 is performed again. It is determined whether or not the number of boilers 20 to be burned is further increased by the processing from.

Next, the boiler system 1 which concerns on 4th Embodiment of this invention is demonstrated, referring FIGS. 35-41.
In the fourth embodiment, as shown in FIG. 35, three operation zones of a first eco operation zone Z1, a second eco operation zone Z2, and a normal operation zone Z3 are set in the plurality of boilers 20. ing. The second eco-operation zone Z2 is located in a range where the load factor is lower than that of the first eco-operation zone Z1, and the normal operation zone Z3 is located in a range where the load factor is lower than that of the second eco-operation zone Z2. Yes. That is, in the fourth embodiment, the plurality of boilers 20 have boiler characteristics in which the boiler efficiency is highest in a range where the load factor is high, and the boiler efficiency is lowered as the load factor is reduced.

And in 4th Embodiment, the control part 4 (boiler number control part 42) is the number of the boilers 20 burned, when the state where the load factor of the boiler 20 is located in the normal operation zone Z3 continues for the third time T3. Decrease by one.
Specifically, as shown in FIG. 36, when the state in which the load factor of the No. 3 boiler 20 is located in the normal operation zone Z3 continues for the third time T3, the boiler unit control unit 42, as shown in FIG. Then, the combustion of the No. 3 boiler 20 is stopped, and the load factor of the No. 1 and No. 2 boilers 20 is increased by ½ of the operating load factor S8 of the No. 3 boiler 20, respectively.

Further, the control unit 4 (boiler unit control unit 42) continues the fourth time T4 in which the load factor of the boiler 20 is located in the normal operation zone Z3 or the second eco operation zone Z2 is longer than the third time T3. In this case, the number of boilers 20 to be burned is reduced by one.
Specifically, for example, as shown in FIG. 38, there is a state in which the three boilers 20 of the No. 1 boiler 20 to the No. 3 boiler 20 are burning in the normal operation zone Z3 or the second eco-operation zone Z2. When the fourth time T4 is continued, the boiler unit control unit 42 stops the combustion of the No. 3 boiler 20 and sets the load factor of the No. 1 and No. 2 boilers 20 as shown in FIG. 39, respectively. The operating load factor S9 of 20 is increased by 1/2.

Next, operation | movement of the boiler system 1 of 4th Embodiment is demonstrated, referring FIG.40 and FIG.41.
First, the operation of the boiler system 1 when the load factor of the boiler 20 is located in the normal operation zone Z3 (see FIGS. 36 and 37) will be described with reference to FIG.

  In this case, in step ST101, the determination unit 41 determines whether the time during which the load factor of the boiler 20 is located in the normal operation zone Z3 has continued for the third time T3. When it is determined by the determination unit 41 that the time located in the normal operation zone Z3 has continued for the third time T3, the process proceeds to step ST102. If the determination unit 41 determines that the time period in the normal operation zone Z3 has not continued for the third time T3, the process returns to step ST101.

  In step ST102, the boiler number control unit 42 decreases the number of boilers 20 to be burned by one, and ends the process. Specifically, the boiler number control unit 42 stops the combustion of one boiler 20, and increases the load factor of the boiler 20 that continues the combustion by an amount corresponding to the operation load factor of the boiler 20 that stops the combustion. . Also, the time counted for determination by the determination unit 41 in step ST101 is reset.

  In addition, after reducing the number of boilers 20 to be burned by the above process, if the boiler 20 that continues to burn is still located in the normal operation zone Z3, the process from step ST101 is performed again. It is determined whether the number of boilers 20 to be burned is further reduced.

  Next, the operation of the boiler system 1 when the load factor of the boiler 20 is located in the normal operation zone Z3 or the second eco-operation zone Z2 (see FIGS. 38 and 39) will be described with reference to FIG. .

  In this case, in step ST111, the determination unit 41 determines whether the time during which the load factor of the boiler 20 is located in the normal operation zone Z3 or the second eco operation zone Z2 has continued for the fourth time T4. When it is determined by the determination unit 41 that the time located in the normal operation zone Z3 or the second eco-operation zone Z2 has continued for the fourth time T4, the process proceeds to step ST112. If the determination unit 41 determines that the time in the normal operation zone Z3 or the second eco-operation zone Z2 has not continued for the fourth time T4, the process returns to step ST111.

  In step ST112, the boiler number control unit 42 reduces the number of boilers 20 to be burned by one, and ends the process. Specifically, the boiler number control unit 42 stops the combustion of one boiler 20, and increases the load factor of the boiler 20 that continues the combustion by an amount corresponding to the operation load factor of the boiler 20 that stops the combustion. . Further, the time counted for determination by the determination unit 41 in step ST111 is reset.

  In addition, after reducing the number of boilers 20 to be burned by the above processing, when the boiler 20 that continues to burn is still located in the normal operation zone Z3 or the second eco-operation zone Z2, Whether or not the number of boilers 20 to be burned is further reduced is determined by the processing from step ST111.

Next, the boiler system 1 which concerns on 5th Embodiment of this invention is demonstrated, referring FIGS. 42-48.
In the fifth embodiment, as shown in FIG. 42, three operation zones of a first eco operation zone Z1, a second eco operation zone Z2, and a normal operation zone Z3 are set in the plurality of boilers 20. ing. The second eco-operation zone Z2 is located in a range where the load factor is higher than that of the first eco-operation zone Z1, and the normal operation zone Z3 is located in a range where the load factor is higher than that of the second eco-operation zone Z2. Yes. In other words, in the fifth embodiment, the plurality of boilers 20 have boiler characteristics in which the boiler efficiency is highest in a range where the load factor is low, and the boiler efficiency decreases as the load factor increases.

In the fifth embodiment, the boiler number control unit 42 increases the number of boilers 20 to be burned by one when the load factor of the boiler 20 is in the normal operation zone Z3 for the first time T1. .
Specifically, as shown in FIG. 43, when the state in which the two boilers 20 of Unit 1 and Unit 2 are burning in the normal operation zone Z3 continues for the first time T1, the number-of-boilers control unit 44, as shown in FIG. 44, the No. 3 boiler 20 is combusted, and the load factors of the No. 1 and No. 2 boilers 20 are respectively reduced, and the three boilers 20 are burned at the same load factor.

In addition, the control unit 4 (determination unit 41) also determines the boiler 20 to be burned even when the load factor of the boiler 20 is in the normal operation zone Z3 or the second eco operation zone Z2 for the second time T2. Increase the number by one.
Specifically, as shown in FIG. 45, the state in which the two boilers 20 of No. 1 and No. 2 are burning in the range of the normal operation zone Z3 or the second eco-operation zone Z2 continues for the second time T2. In this case, as shown in FIG. 46, the boiler number control unit 42 burns the No. 3 boiler 20 and reduces the load factor of the No. 1 and No. 2 boilers 20 to load the three boilers 20 with the same load. Burn at a rate.

Next, operation | movement of the boiler system 1 of 5th Embodiment is demonstrated, referring FIG.47 and FIG.48.
First, the operation of the boiler system 1 when the load factor of the boiler 20 is located in the normal operation zone Z3 (see FIGS. 43 and 44) will be described with reference to FIG.

  In this case, in step ST121, the determination unit 41 determines whether the time during which the load factor of the boiler 20 is located in the normal operation zone Z3 has continued for the first time T1. When it is determined by the determination unit 41 that the time located in the normal operation zone Z3 has continued for the first time T1, the process proceeds to step ST122. When it is determined by the determination unit 41 that the time located in the normal operation zone Z3 does not continue for the first time T1, the process returns to step ST121.

  In step ST122, the boiler number control unit 42 increases the number of boilers 20 to be burned, and ends the process. Specifically, the boiler number control unit 42 causes the boiler 20 to newly start combustion to burn at a predetermined load factor, and the load factor of the boiler 20 already burned corresponds to the predetermined load factor. All boilers 20 are burned at the same load factor. Also, the time counted for determination by the determination unit 41 in step ST121 is reset.

  In addition, after increasing the number of boilers 20 to be burned by the above process, when the boiler 20 that has already been burned is still located in the normal operation zone Z3, the process from step ST121 is performed again. Thus, it is determined whether to further increase the number of boilers 20 to be burned.

  Next, the operation of the boiler system 1 when the load factor of the boiler 20 is located in the normal operation zone Z3 or the second eco-operation zone Z2 (see FIGS. 45 and 46) will be described with reference to FIG. .

  In this case, in step ST131, the determination unit 41 determines whether the time during which the load factor of the boiler 20 is located in the normal operation zone Z3 or the second eco operation zone Z2 has continued for the second time T2. If the determination unit 41 determines that the time in the normal operation zone Z3 or the second eco-operation zone Z2 has continued for the second time T2, the process proceeds to step ST132. When it is determined by the determination unit 41 that the time located in the normal operation zone Z3 or the second eco-operation zone Z2 has not continued for the second time T2, the process returns to step ST131.

  In step ST132, the boiler number control unit 42 increases the number of boilers 20 to be burned, and ends the process. Specifically, the boiler number control unit 42 causes the boiler 20 to newly start combustion to burn at a predetermined load factor, and the load factor of the boiler 20 already burned corresponds to the predetermined load factor. All boilers 20 are burned at the same load factor. Also, the time counted for determination by the determination unit 41 in step ST131 is reset.

  In addition, after increasing the number of boilers 20 to be burned by the above processing, when the boiler 20 that has already been burned is still located in the normal operation zone Z3 or the second eco-operation zone Z2, Again, whether or not the number of boilers 20 to be burned is further increased is determined by the processing from step ST131.

  According to the boiler system of 2nd Embodiment-5th Embodiment demonstrated above, there exists an effect similar to 1st Embodiment.

The preferred embodiments of the boiler system 1 of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and can be modified as appropriate.
For example, in this embodiment, when increasing the number of boilers 20 to be burned, all the boilers 20 to be burned including the newly burned boiler 20 are burned at the same load factor, but this is not restrictive. That is, when increasing the number of boilers 20 to be burned, the newly burned boiler 20 may be burned at the minimum load factor. As a result, when the number of boilers 20 to be burned is increased, the amount by which the load factor of the boiler 20 that is already burned can be reduced. Therefore, since the rapid change of the load factor of the boiler 20 when the number of boilers 20 to be burned is prevented can be improved, the stability of the combustion state of the boiler group 2 can be improved, and the steam pressure output by the boiler group 2 It is possible to suppress the occurrence of fluctuations.

  When increasing the number of boilers 20 to be burned, the newly burned boiler 20 may be burned at a load factor in the range of the lower second eco-operation zone Z22. Accordingly, when the number of boilers 20 to be burned is increased, the boiler 20 that newly starts burning can be burned in the lower second eco-operation zone Z22, so that the boiler efficiency of the boiler system 1 can be improved. .

  Further, in the present embodiment, when the state in which the load factor of all the burning boilers 20 is located in the lower normal operation zone Z32 continues for the third time T3, is the number of boilers 20 to be burned reduced? However, the present invention is not limited to this. That is, the number of boilers 20 to be burned is reduced when the load factor of one of the burning boilers 20 is in the lower normal operation zone Z32 for the third time T3. It may be determined.

  Moreover, although this invention was applied to the boiler system provided with the boiler group 2 which consists of the five boilers 20 in this embodiment, it is not restricted to this. That is, the present invention may be applied to a boiler system including a boiler group including six or more boilers, or may be applied to a boiler system including a boiler group including two boilers.

  Further, in the present embodiment, the boiler 20 is controlled by changing the combustion state between the combustion stop state S0 and the minimum combustion state S1 by turning on / off the combustion of the boiler 20, and the maximum combustion from the minimum combustion state S1. In the range of state S2, although comprised with the proportional control boiler 20 which can control a combustion amount continuously, it is not restricted to this. That is, the boiler may be configured by a proportional control boiler that can continuously control the combustion amount in the entire range from the combustion stop state to the maximum combustion state.

DESCRIPTION OF SYMBOLS 1 Boiler system 2 Boiler group 4 Control part 20 Boiler 41 Judgment part 42 Boiler number control part Z1 1st eco-operation zone Z2 2nd eco-operation zone Z3 Normal operation zone Z21 Upper 2nd eco-operation zone Z22 Lower 2nd eco-operation zone Z31 Upper normal operation zone Z32 Upper normal operation zone

Claims (16)

A boiler system comprising a boiler group including a plurality of boilers capable of burning by continuously changing a load factor, and a control unit that controls a combustion state of the boiler group according to a required load,
In the plurality of boilers,
A first eco-operation zone that is a load factor range in which the boiler efficiency is higher than the first threshold;
A second eco-operation zone, which is a load factor range in which the boiler efficiency is between the first threshold and a second threshold lower than the first threshold;
A normal operation zone that is within a load factor range in which the boiler efficiency is lower than the second threshold value, and
The second eco-driving zone includes an upper second eco-driving zone located in a range where the load factor is higher than the first eco-driving zone, and a lower side located in a range where the load factor is lower than the first eco-driving zone. A second eco-driving zone,
The normal operation zone includes an upper normal operation zone located in a range where the load factor is higher than that of the upper second eco-operation zone, and a lower normal region located in a range where the load factor is lower than that of the lower second eco-operation zone. An operation zone, and
The controller is
When the load factor of the boiler is located in the upper normal operation zone for the first time and the number of boilers to be burned is increased by one, the load factor of the boiler that has already been burned is reduced to the lower normal operation. A determination unit for determining whether or not to be located in a zone;
A boiler system comprising: a boiler number control unit that increases the number of boilers to be burned by one when it is determined by the determination unit that the load factor of a boiler that is already burning is not located in the lower normal operation zone. The determination unit is configured to burn the boiler when the load factor of the boiler is located in the upper normal operation zone or the upper second eco-operation zone for a second time longer than the first time. When increasing the number of units, it is determined whether or not the load factor of the boiler that is already burning is located in the lower normal operation zone or the lower second eco-operation zone,
The number-of-boilers control unit determines whether the boiler that is already burned by the determination unit is not located in the lower normal operation zone or the lower second eco-operation zone. The boiler system according to claim 1, wherein the number is increased by one. In the plurality of boilers, a minimum load factor that is a load factor in the smallest combustion state is set,
The boiler system according to claim 1 or 2, wherein, when the number of boilers to be burned is increased, the boiler number control unit burns a newly burned boiler at the minimum load factor.   The boiler system according to claim 1 or 2, wherein, when the number of boilers to be burned is increased, the boiler number control unit burns a newly burned boiler at a load factor in a range of the lower second eco-operation zone. The determination unit is configured such that when the load factor of the boiler continues for a third time in a state where the boiler is located in the lower normal operation zone, the load factor of the boiler that continues combustion when the number of boilers to be burned is decreased by one. Is determined to be located in the upper normal operation zone,
The boiler number control unit decreases the number of boilers to be burned by one when the determination unit determines that the load factor of the boiler that continues combustion is not located in the upper normal operation zone. The boiler system according to any one of the above. The determination unit burns when the load factor of the boiler is located in the lower normal operation zone or the lower second eco operation zone for a fourth time longer than the third time. Determining whether or not the load factor of the boiler that continues combustion when the number of boilers is decreased is located in the upper normal operation zone or the upper second eco-operation zone,
The boiler number control unit determines the number of boilers to be burned when the determination unit determines that the load factor of the boiler that continues combustion is not located in the upper normal operation zone or the upper second eco operation zone. The boiler system according to any one of claims 1 to 5, wherein the number is reduced. A boiler system comprising a boiler group including a plurality of boilers capable of burning by continuously changing a load factor, and a control unit that controls a combustion state of the boiler group according to a required load,
In the plurality of boilers,
A first eco-operation zone that is a load factor range in which the boiler efficiency is higher than the first threshold;
A second eco-operation zone, which is a load factor range in which the boiler efficiency is between the first threshold and a second threshold lower than the first threshold;
A normal operation zone that is within a load factor range in which the boiler efficiency is lower than the second threshold value, and
The second eco-driving zone includes an upper second eco-driving zone located in a range where the load factor is higher than the first eco-driving zone, and a lower side located in a range where the load factor is lower than the first eco-driving zone. A second eco-driving zone,
The normal operation zone is located in a range where the load factor is higher than the upper second eco-operation zone,
The controller is
A boiler system that increases the number of boilers to be burned by one when the load factor of the boiler is in the normal operation zone for a first time. The controller controls the number of boilers to be burned when the load factor of the boiler is in the normal operation zone or the upper second eco-operation zone for a second time longer than the first time. When one is increased, it is determined whether or not the load factor of the already burning boiler is located in the lower second eco-operation zone,
The boiler system according to claim 7, wherein the number of boilers to be burned is increased by one when it is determined that the load factor of the boiler that has already burned is not located in the lower second eco-operation zone. When the state in which the load factor of the boiler is located in the lower second eco-operation zone continues for a fourth time, the control unit reduces the number of boilers to be burned and reduces the number of boilers that continue to burn. Determining whether the load factor is located in the normal operation zone or the upper second eco-operation zone;
The boiler according to claim 7 or 8, wherein the number of boilers to be burned is reduced by one when it is determined that the load factor of the boiler that continues to burn is not located in the normal operation zone or the upper second eco-operation zone. system. A boiler system comprising a boiler group including a plurality of boilers capable of burning by continuously changing a load factor, and a control unit that controls a combustion state of the boiler group according to a required load,
In the plurality of boilers,
A first eco-operation zone that is a load factor range in which the boiler efficiency is higher than the first threshold;
A second eco-operation zone, which is a load factor range in which the boiler efficiency is between the first threshold and a second threshold lower than the first threshold;
A normal operation zone that is within a load factor range in which the boiler efficiency is lower than the second threshold value, and
The second eco-driving zone includes an upper second eco-driving zone located in a range where the load factor is higher than the first eco-driving zone, and a lower side located in a range where the load factor is lower than the first eco-driving zone. A second eco-driving zone,
The normal operation zone is located in a range where the load factor is lower than the lower second eco-operation zone,
The controller is
A boiler system that reduces the number of boilers to be burned by one when the load factor of the boiler continues for a third time in a state where the boiler is located in the normal operation zone. The controller is configured to burn the boiler when the load factor of the boiler is in the normal operation zone or the lower second eco-operation zone for a fourth time longer than the third time. It is determined whether or not the load factor of the boiler that continues combustion when the number is decreased is positioned in the upper second eco-operation zone,
The boiler system according to claim 10, wherein when it is determined that the load factor of the boiler that continues to burn is not located in the upper second eco-operation zone, the number of boilers to be burned is reduced by one. The controller, when the load factor of the boiler is located in the upper second eco-friendly zone continues for the second time, when the number of boilers to be burned is increased by one, the load of the boiler that is already burning Determining whether the rate is to be located in the normal driving zone or the lower second eco-driving zone;
The number of boilers to be burned is increased by one when it is determined that the load factor of a boiler that has already burned is not located in the normal operation zone or the lower second eco-operation zone. Boiler system. A boiler system comprising a boiler group including a plurality of boilers capable of burning by continuously changing a load factor, and a control unit that controls a combustion state of the boiler group according to a required load,
In the plurality of boilers,
A first eco-operation zone that is a load factor range in which the boiler efficiency is higher than the first threshold;
A second eco-operation zone, which is a load factor range in which the boiler efficiency is between the first threshold and a second threshold lower than the first threshold;
A normal operation zone that is within a load factor range in which the boiler efficiency is lower than the second threshold value, and
The second eco-operation zone is located in a range where the load factor is lower than that of the first eco-operation zone, and the normal operation zone is located in a range where the load factor is lower than that of the second eco-operation zone,
The controller is
A boiler system that reduces the number of boilers to be burned by one when the load factor of the boiler is in the normal operation zone for a third time.   When the state where the load factor of the boiler is located in the normal operation zone or the second eco-operation zone continues for a fourth time longer than the third time, the control unit counts the number of boilers to be burned. The boiler system according to claim 13, wherein the boiler is reduced. A boiler system comprising a boiler group including a plurality of boilers capable of burning by continuously changing a load factor, and a control unit that controls a combustion state of the boiler group according to a required load,
In the plurality of boilers,
A first eco-operation zone that is a load factor range in which the boiler efficiency is higher than the first threshold;
A second eco-operation zone, which is a load factor range in which the boiler efficiency is between the first threshold and a second threshold lower than the first threshold;
A normal operation zone that is within a load factor range in which the boiler efficiency is lower than the second threshold value, and
The second eco-operation zone is located in a range where the load factor is higher than that of the first eco-operation zone, and the normal operation zone is located in a range where the load factor is higher than that of the second eco-operation zone,
The controller is
A boiler system that increases the number of boilers to be burned by one when the load factor of the boiler is in the normal operation zone for a first time.   The controller is configured to reduce the number of boilers to be burned when the load factor of the boiler is in the normal operation zone or the second eco operation zone for a second time longer than the first time. The boiler system according to claim 15, wherein the number of units is increased.

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