JP5418109B2 - Boiler group control method, program, controller, and boiler system - Google Patents

Description

  The present invention relates to a control method, a program, a controller, and a boiler system for a boiler group composed of a plurality of boilers.

  Conventionally, when controlling a boiler group including boilers having a plurality of staged combustion positions, a technique is disclosed in which priority is set for each boiler and each boiler is controlled according to the priority according to a required load. (For example, refer to Patent Document 1).

  In the control of the boiler group as described in Document 1, when increasing or decreasing the number of combustion of boilers, for example, in a three-position boiler, when increasing the combustion amount, combustion is performed by increasing the number of boilers at a high combustion position. When reducing the number of units to achieve high efficiency and reducing the amount of combustion, it is common practice to improve the responsiveness by securing a large number of boilers at low combustion positions.

JP 2002-81604 A

  However, the responsiveness of the boilers constituting the boiler group is not uniform depending on the individual boilers and combustion positions. Selecting the boilers to be burned and their combustion positions uniformly according to the priority order, etc. May decrease.

  For example, as shown in FIG. 6, the No. 1 boiler, No. 2 boiler, and No. 3 boiler constituting the boiler group burn at the second combustion position (maximum combustion position), the No. 4 boiler is the combustion stop position, and the No. 5 boiler is the continuous pilot combustion state. (P), and when each boiler No 1,..., 5 is prioritized in the order in <> described on the frame representing each boiler No 1,. When the amount is increased, No4 is shifted to the first combustion position, and when the amount of evaporation is decreased, No3 is returned to the first combustion position.

  In this case, for example, the transition time from the second combustion position of the No1, No2 boiler to the first combustion position is 8 seconds each, the transition time from the second combustion position of the No3 boiler to the first combustion position is 15 seconds, When the transition time from the combustion stop position of No. 4 to the first combustion position is 190 seconds, the transition time from the continuous pilot combustion state (P) of No. 5 to the first combustion position is 6 seconds, and when the evaporation amount is increased When the No. 4 boiler moves to the upper combustion position and the evaporation amount decreases, the No. 3 boiler moves to the lower combustion position, and the transition based on the priority may be disadvantageous in terms of responsiveness.

  The present invention has been made in consideration of such circumstances, and control of a boiler group capable of efficiently improving responsiveness in a boiler group having boilers having a plurality of stepwise combustion positions. It is an object to provide a method, a program, a controller, and a boiler system.

In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 is a program for controlling a boiler group including a boiler having a plurality of stepwise combustion positions, and when the boiler moves to another combustion position or a combustion stop position, The other combustion position or the combustion stop position to be transferred next is selected so that the transition time at the time of shifting to another combustion position or the combustion stop position becomes the shortest time, and it is in the steaming transition process of the boiler The boiler is configured to select the other combustion position or the combustion stop position to be transferred next, using the time until steaming at the lowest combustion position as the transition time .

The invention according to claim 5 is a control method of a boiler group including a boiler having a plurality of stepwise combustion positions, and when the boiler moves to another combustion position or a combustion stop position, the other The other combustion position or the combustion stop position to be transferred next is selected so that the transition time at the time of shifting to the combustion position or the combustion stop position becomes the shortest time, and the boiler in the steaming transition process among the boilers Is characterized in that the time until steaming at the lowest combustion position is set as the transition time, and the other combustion position or the combustion stop position to be transferred next is selected .

The invention described in claim 3 is a controller, and includes the program described in claim 1 or claim 2 .

A fourth aspect of the present invention is a boiler system, and includes the controller according to the third aspect.

According to the program, the controller, the boiler system, and the boiler group control method according to the present invention, when any boiler is shifted to another combustion position or combustion stop position in the boiler group, the transition time is set to the shortest time. Since the other combustion position or the combustion stop position is selected as described above, the responsiveness of the boiler group can be improved efficiently.
In addition, when any boiler is moved to another combustion position or combustion stop position, for the boiler in the steaming transition process, the lowest position is output after a signal to move to another combustion position or combustion stop position is output. Since the time until steaming at the combustion position is selected as the transition time, it is possible to efficiently select another combustion position or combustion stop position at which the transition time is the shortest time.

  In this specification, the transition time refers to a predetermined evaporation amount after a signal instructing transition to another combustion position or combustion stop position is output and then the transition to the other combustion position or combustion stop position instructed. Time to become.

In this specification, the steaming transition process is, for example, the first combustion position at the combustion stop position after the boiler in the purge (including light wind purge) and pilot combustion (including continuous pilot combustion) starts combustion. The process from the start of combustion to the steaming in the first combustion position after the start of combustion of the burner corresponding to low combustion until the boiler whose combustion is released becomes the combustion stop position until the water temperature falls to room temperature The following 1st state is classified into the 5th state, and it can be steamed in a short time in the order from the 1st state to the 5th state.
First state: in low combustion position, not steaming but holding pressure Second state: after releasing low combustion, it becomes purge or pilot combustion state, not steaming but holding pressure State 3rd state: Low combustion is released and standby state is entered, steam is not supplied but pressure is maintained 4th state: Water is heated from the combustion stop position to the low combustion position, but pressure is increased State not holding (no pressure state)
Fifth state: purge or pilot combustion state but no pressure (no pressure state)
The fifth state includes a case where the pressure is reduced from the second state to a no-pressure state, and a case where the purge or pilot combustion state is entered at the combustion stop position and the pressure is not applied.
In the steaming transition process, the transition from the first state, the second state, and the third state in the pressure maintaining state to the first combustion position is suitable for shortening the transition time.
The continuous pilot combustion state refers to the continuous combustion state of the pilot burner that is performed in order to prevent unburned gas from staying in the can so that it can be ignited as soon as a combustion signal is output in a gas-fired boiler. Say.
Note that the light air purge is a small air flow rate by reducing the blower rotation speed so that unburned gas does not stay in the can so that it can be ignited as soon as a combustion signal is output in an oil-fired boiler. This means maintaining the air blowing state.

Invention of Claim 2 is a program of Claim 1 , Comprising: Said other combustion position or combustion stop position which transfers to the next so that the evaporation amount corresponding to the request | requirement load in the said boiler group may be ensured It is characterized by selecting.

Invention of Claim 6 is a control method of the boiler group of Claim 5 , Comprising: Said other combustion position which transfers to the next so that the evaporation amount corresponding to the request | requirement load in the said boiler group may be ensured. Alternatively, the combustion stop position is selected.

  According to the program and the boiler group control method according to the present invention, when the boiler is moved to another combustion position or the combustion stop position, the evaporation amount corresponding to the required load of the boiler group is ensured. Followability can be improved efficiently.

  According to the program, the controller, the boiler system, and the boiler group control method according to the present invention, when any one of the boilers is transferred to another combustion position or the combustion stop position, the transition time is set to the shortest time. Since the combustion position or the combustion stop position is selected, the response of the boiler group can be improved efficiently.

It is a figure showing the outline of the boiler system concerning one embodiment of the present invention. It is a figure explaining the outline of the boiler which constitutes the boiler group concerning one embodiment. It is a figure which shows an example of the database which concerns on one Embodiment. It is a flowchart explaining an example of the program which concerns on one Embodiment. It is the schematic explaining an example of operation | movement of the boiler system which concerns on one Embodiment. It is the schematic explaining an example of a prior art.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a diagram showing an embodiment of a controller according to the present invention, and reference numeral 1 denotes a boiler system.

The boiler system 1 includes a boiler group 2 composed of a plurality of boilers, a control unit (controller) 4, a steam header 6, and a pressure sensor 7 provided in the steam header 6, and is generated in the boiler group 2. The generated steam is supplied to the steam use facility 18.
In this embodiment, the boiler group 2 includes, for example, a first boiler 21, a second boiler 22, a third boiler 23, a fourth boiler 24, and a fifth boiler 25, and includes five steam boilers.

  The required load in this embodiment is substituted by the pressure (physical quantity) of the steam in the steam header 6 detected by the pressure sensor 7, and the amount of evaporation corresponding to the consumed steam quantity of the steam using equipment 18 is calculated based on this pressure. It comes to calculate.

  The steam header 6 is connected to the first boiler 21,..., The fifth boiler 25 and the steam pipe 11, and is connected to the steam using facility 18 and the steam pipe 12, and steam generated in the boiler group 2. The steam is supplied to the steam using equipment 18 by adjusting the pressure difference and pressure fluctuation between the boilers.

  Each of the boilers 21,..., 25 constituting the boiler group 2 is, for example, a three-position control boiler having the same configuration as shown in FIG. Combustion in a low combustion state (corresponding to the first combustion position) and a high combustion state (corresponding to the second combustion position), which are lower combustion positions, can be controlled.

  Each of the boilers 21,..., 25 has an evaporation when the first differential evaporation amount is set to 1000 (kg / h), the second differential evaporation amount is set to 1500 (kg / h), and combustion is performed at the second combustion position. The amount, that is, the rated evaporation amount is 2500 (kg / h).

  In this embodiment, the difference evaporation amount is an evaporation amount that increases when the boiler is moved to a higher combustion position, that is, an evaporation amount at the combustion position after the transition and a combustion stop position (or combustion before the transition). The difference between the amount of evaporation at the position) and the amount of evaporation that increases as a result of shifting to a higher stage and becoming the Nth combustion position (N is an integer of 1 or more) Or the “Nth differential evaporation amount”. For example, the evaporation amount that increases when the combustion shifts from the combustion stop position to the first combustion position is the “differential evaporation amount at the first combustion position” or “first differential evaporation”. The amount of evaporation and the amount of evaporation that increases when the first combustion position shifts to the second combustion position are referred to as “differential evaporation amount at the second combustion position” or “second differential evaporation amount”.

For example, the first boiler 21 has a transition time from the combustion stop position to the first combustion position of 190.0 seconds, a transition time from the first combustion position to the second combustion position of 5.0 seconds, and from the second combustion position. The transition time to the first combustion position is 4.5 seconds, and the transition time from the first combustion position to the second combustion position is 5.0 seconds.
The second boiler 22, the third boiler 23, the fourth boiler 24, and the fifth boiler 25, for example, have a transition time from the combustion stop position to the first combustion position of 190.0 seconds and from the first combustion position to the second. The transition time to the combustion position is 5.0 seconds, the transition time from the second combustion position to the first combustion position is 4.0 seconds, and the transition time from the first combustion position to the second combustion position is 5.0 seconds. Has been.

The period from the combustion stop position in each of the boilers 21,..., 25 to the first combustion position that is the lowest combustion position and steaming is referred to as a steaming transition process. The first state can be classified into the fifth state (the state between the first state and the fifth state is included in any state).
(1) First state: in a low combustion position, not steamed but maintaining pressure (2) Second state: after releasing low combustion, it becomes a continuous pilot combustion state, not steamed but pressure (3) Third state: Canceling low combustion to enter standby state, not steaming but holding pressure (4) Fourth state: From combustion stop position to low combustion position The state where the water has been transferred and heated, but the pressure is not maintained (no pressure state)
(5) Fifth state: Continuous pilot combustion state but no pressure maintained (no pressure state)

In this embodiment, each of the boilers 21,..., 25 can be maintained in each state of the steaming transition process, and can be shifted from each state to the first combustion position.
The transition time from when each boiler 21,..., 25 transitions from each state of the steaming transition process to the first combustion position and steams is, for example, 6.0 seconds for the first state and the second state. Is 8.0 seconds, the third state is 15.0 seconds, the fourth state is 120.0 seconds, and the fifth state is 180.0 seconds.
As described above, the transition from the first state, the second state, and the third state in the pressure holding state during the steaming transition process to the first combustion position is preferable in that the transition time is shortened. In this embodiment, the calculation target of the steaming transition process for shifting to the first combustion position based on the transition time is set to the first state and the second state.

  Further, each of the boilers 21,..., 25 can be shifted to a combustion position or a combustion stop position according to a required load by, for example, a well-known combustion position control technique. When the pressure becomes higher, the evaporation amount is decreased, and when the pressure becomes lower, the evaporation amount is increased.

  The control unit 4 includes an input unit 41, a memory 42, a calculation unit 43, a hard disk 44, an output unit 46, and a communication line 47, and includes an input unit 41, a memory 42, a calculation unit 43, a hard disk 44, and an output. The units 46 are connected to each other via a communication line 47 so that data and the like can be communicated with each other, and a database 45 is stored in the hard disk 44.

The input unit 41 includes, for example, a data input device such as a keyboard (not shown) and can output settings and the like to the calculation unit 43. The pressure sensor 7, the boilers 21,... 13. Connected by the signal line 16, and outputs the pressure signal input from the pressure sensor 7 and the signals input from the boilers 21,..., 25 (for example, information such as the combustion position) to the calculation unit 43. It has become.
The output unit 46 is connected to the boilers 21,..., 25 by the signal line 14, and outputs the control signal output from the calculation unit 43 to the boilers 21,.

  The calculation unit 43 reads and executes a program stored in a storage medium (for example, ROM) of the memory 42, for example, calculates the evaporation amount corresponding to the required load, and the operating state of each boiler input from the input unit 41 When the boilers 21,..., 25 are moved to other combustion positions or combustion stop positions based on the information on the above, etc., the total evaporation that satisfies the necessary evaporation corresponding to the required load corresponding to the required load is determined. Selection of another combustion position or combustion stop position where the amount can be secured, and a signal to each boiler 21,..., 25 is output via the output unit 46 based on the result. .

The database 45 includes a first database 45A, a second database 45B, and a third database 45C.
In the first database 45A, a data table indicating the relationship between the pressure signal (mV) and the pressure (Pa) is stored as numerical data, and the calculation unit 43 refers to the first database 45A and refers to the pressure sensor. The pressure (Pa) in the steam header 6 is calculated based on the pressure signal (mV) from 7.

  The second database 45B stores, for example, the first differential evaporation amount, the second differential evaporation amount, and the rated evaporation amount of each boiler 21,..., 25 in the form of a data table. However, the total evaporation amount can be calculated with reference to the second database 45B. Further, when the target boiler is in the steaming transition process, the total evaporation amount is calculated with respect to the first differential evaporation amount.

  Further, as shown in FIG. 3, for example, the third database 45C has a first combustion position from each state (first state to fifth state) in the steaming transition process of each boiler 21,... The transition time until steaming and the transition time when transitioning between the combustion stop position, the first combustion position, and the second combustion position are stored in the form of a data table.

  The program according to the embodiment calculates a required evaporation amount corresponding to the required load based on the pressure of the steam header 6 detected by the pressure sensor 7 so that the total evaporation amount of the boiler group 2 satisfies the required evaporation amount. In addition, another combustion position or combustion stop position to be transferred next is listed, and a combustion position or combustion stop position at which the transition time is the shortest time is selected from the listed combustion positions or combustion stop positions. It has become.

  In addition, when the boilers 21,..., 25 are maintained in the respective states of the steaming transition process as required, and the boiler in the steaming transition process is shifted to the first combustion position, the third database Calculation is based on the transition time corresponding to each state of the steaming transition process stored in 45C.

For example, the program has a schematic configuration as shown in the flowchart of FIG.
Note that the transition of the combustion position or the combustion stop position based on the pressure signal of the pressure sensor 7 in the program is based on the well-known combustion position control technique as described above, and the description thereof is omitted.

Hereinafter, with reference to FIG. 4, a flowchart according to an example of the program will be described.
(1) First, the initial evaporation value (=) is set to the total evaporation amount JR obtained by adding up the required evaporation amount JN corresponding to the required load of the boiler group 2 and the evaporation amounts of the boilers 21,. 0) is set (S1).
(2) It is determined whether the boiler group 2 is in operation (S2).
When the boiler group 2 is operating, the process proceeds to S3, and when the operation is stopped, the program is terminated.
(3) The computing unit 43 calculates the required evaporation amount JN based on the pressure signal of the pressure sensor 7 acquired via the input unit 41 (S3).
(4) The computing unit 43 compares the required evaporation amount JN calculated in S3 with the required evaporation amount JN stored in the memory 42, and determines whether or not the required evaporation amount JN has a variation of a predetermined value or more. (S4). Further, the required evaporation amount JN calculated in S3 is stored in the memory 42.
If the required evaporation amount JN varies more than a predetermined amount, the process proceeds to S5, and if not, the process proceeds to S2. Here, the predetermined amount related to the required evaporation amount JN can be arbitrarily set, and is set to 100 (kg / h), for example.
(5) The computing unit 43 determines whether or not the change in the required evaporation amount JN is an increase (S5).
If the change in the required evaporation amount JN is an increase, the process proceeds to S6, and if it is not an increase but a decrease, the process proceeds to S12.
(6) The computing unit 43 compares the required evaporation amount JN with the total evaporation amount JR of the boiler group 2 (S6).
When the required evaporation amount JN> the total evaporation amount JR, the process proceeds to S7, and when the required evaporation amount JN ≦ the total evaporation amount JR, the process proceeds to S2.
(7) When each of the boilers 21,..., 25 shifts to a higher combustion position, the calculation unit 43 has a higher transitionable upper level that satisfies the required evaporation amount JN ≦ total evaporation amount JR. List combustion positions (or combinations of combustion positions) (S7).
(8) In S7, it is determined whether there is an upper combustion position (or combination of combustion positions) that can be transferred (S8).
If there is a higher combustion position (or combination of combustion positions) that can be transferred, the process proceeds to S9, and if not, the process proceeds to S2.
(9) The computing unit 43 refers to the third database 45C, and selects the combustion position (or combination of combustion positions) listed in S7 that has the shortest transition time (S9). .
(10) The computing unit 43 outputs a signal for shifting to the selected combustion position (or combination of combustion positions) (S10).
(11) The computing unit 43 calculates the total evaporation amount JR when the combustion position (or combination of combustion positions) is selected and stores it in the memory 42 (S11).
If S11 is performed, it will transfer to S2.
(12) The computing unit 43 determines whether or not there is a combustion position that can cancel the combustion and shift to the lower level while satisfying the required evaporation amount JN ≦ total evaporation amount JR (S12).
If there is a combustion position where the required evaporation amount JN ≦ total evaporation amount JR can be satisfied and combustion can be canceled and shifted to a lower position, the process proceeds to S13, and if not, the process proceeds to S2.
(13) The computing unit 43 lists combustion positions (or combinations of combustion positions) at which the boilers 21,..., 25 can be shifted to the lower order (S13).
(14) The computing unit 43 selects the combustion position (or combination of combustion positions) that can be shifted to the lower order listed in S13 and that has the shortest transition time (S14).
(15) The computing unit 43 outputs a signal for shifting to the selected combustion position (or combination of combustion positions) (S15).
(16) The computing unit 43 calculates the total evaporation amount JR when the combustion position (or combination of combustion positions) is selected and stores it in the memory 42 (S16).
If S16 is performed, it will transfer to S2.
The above (2) to (16) are repeatedly executed.

Next, the operation of the boiler system 1 will be described with reference to FIG.
FIG. 5 is a schematic diagram showing the states of the boilers 21,..., 25 when the boiler group 2 is controlled using a program, and a square frame indicates the first combustion of the boilers 21,. Numerical values 1000 and 1500 indicating the combustion state at the position and the second combustion position on the left side indicate the first differential evaporation amount and the second differential evaporation amount.
In FIG. 5, the shaded portion indicates the combustion position during steaming, the portion marked “P1” indicates the combustion position in the first state of the steaming transition process, and the portion marked “P2” The combustion position in the 2nd state of the steaming transfer process is shown.

  For convenience, as shown in FIG. 5A, the first boiler 21 and the second boiler 22 are steamed at the second combustion position, and the third boiler 23 is in the second state of the steaming transition process. A case where the four boilers 24 are in the first state of the steaming transition process will be described as an example.

(1) First, as described above, FIG. 5A shows that the first boiler 21 and the second boiler 22 are steamed at the second combustion position, and the third boiler 23 is in the second state of the steaming transition process. It shows that the four boilers 24 are in the first state of the steaming transition process.
Here, for convenience, the required evaporation amount JN is 5000 (kg / h) and the total evaporation amount JR5000 (kg / h), and the required evaporation amount JN and the total evaporation amount are equal.
(2) Next, it is assumed that the required load of the boiler group 2 is increased, for example, the required evaporation amount JN is increased by 1000 (kg / h).
The computing unit 43 calculates the required evaporation amount JN of 6000 (kg / h) via S2 (S3).
(3) The computing unit 43 compares the required evaporation amount JN calculated in S3 with the required evaporation amount JN (= 5000 (kg / h)) stored in the memory 42, and the required evaporation amount JN is equal to or greater than a predetermined value. Is determined (S4), the process proceeds to S5.
(4) The computing unit 43 determines that the change in the required evaporation amount JN is an increase (S5), and proceeds to S6.
(5) The calculation unit 43 compares the required evaporation amount JN (6000 (kg / h)) with the total evaporation amount JR (= 5000 (kg / h)) of the boiler group 2 in FIG. It is determined that required evaporation amount JN> total evaporation amount JR (S6).
(6) The calculation unit 43 shifts at least one of the boilers 21,..., 25 to a higher combustion position, thereby achieving a higher combustion position that satisfies (required evaporation amount JN ≦ total evaporation amount JR). (Or combination of combustion positions) is listed (S7).
Specifically, for example, the list is listed in the following procedure.
First, based on the state of each boiler 21,..., 25 input via the input unit 41, each boiler 21,. In this case, the difference evaporation amount and the transition time are calculated.
Here, the states of the boilers 21 to 25 in FIG. 5A are as follows.
Since the first boiler 21 and the second boiler 22 are in the second combustion position, there is no upper combustion position that can be transferred.
Since the 3rd boiler 23 is the 2nd state of the steaming transition process, it can transfer to the 1st combustion position or the 2nd combustion position, and when it shifts to the 1st combustion position, the increase in the amount of evaporation is 1000 ( kg / h) and the transition time is 8.0 seconds. When the transition is made to the second combustion position, the increase in evaporation amount is 2500 (kg / h), and the transition time is 13.0 seconds (= 8.0 + 5. 0 seconds).
Since the 4th boiler 24 is the 1st state of the steaming transition process, it can shift to the 1st combustion position or the 2nd combustion position, and when it shifts to the 1st combustion position, the increase in evaporation amount is 1000 ( kg / h), the transition time is 6.0 seconds, and when the transition is made to the second combustion position, the increase in evaporation amount is 2500 (kg / h), and the transition time is 11.0 seconds (= 6.0 + 5. 0 seconds).
Since the 5th boiler 25 is in a combustion stop position, it can transfer to the 1st combustion position or the 2nd combustion position, and when changing to the 1st combustion position, the increase in evaporation amount is 1000 (kg / h), The transition time is 190.0 seconds. When transitioning to the second combustion position, the increase in evaporation amount is 2500 (kg / h)), and the transition time is 195.0 seconds (= 190.0 + 5.0 seconds). is there.
Here, when any of the third boiler 23, the fourth boiler 24, and the fifth boiler 25 that can be shifted to the upper level shifts the combustion position to one level higher, the total evaporation amount JR of the boiler group 2 is the required evaporation. Since the amount JN6000 (kg / h) is satisfied,
1) Transition the third boiler 23 to the first combustion position (transition time, 8.0 seconds)
2) Move the fourth boiler 24 to the first combustion position (transition time, 6.0 seconds)
3) Move the fifth boiler 25 to the first combustion position (transition time, 190.0 seconds)
Are listed (S7).
(7) The computing unit 43 determines that there is an upper combustion position that can be transferred (S8).
(8) From the candidates listed in S7, the transition time is the shortest time, and 2) the fourth boiler 24 is shifted to the first combustion position (S9).
(9) Next, the signal selected in S9 is output. 1) A signal for shifting the fourth boiler 24 to the first combustion position is output (S10).
As a result, as shown in FIG. 5B, the fourth boiler 24 moves to the first combustion position.
(10) Next, the calculation unit 43 calculates the total evaporation amount JR (= 6000 (kg / h)) after the fourth boiler 24 has moved to the first combustion position (S11), and stores it in the memory 42. To S2.
At this time,
Necessary evaporation amount JN is 6000 (kg / h)
Total evaporation amount JR is 6000 (kg / h)
It is.

(11) Next, it is assumed that the required load of the boiler group 2 is reduced, for example, the required evaporation amount JN is reduced by 1600 (kg / h).
The calculation unit 43 calculates 4400 (kg / h) as the required evaporation amount JN via S2 (S3).
(12) The calculation unit 43 compares the required evaporation amount JN (= 4400 (kg / h)) calculated in S3 with the required evaporation amount JN (= 6000 (kg / h)) stored in the memory 42, It is determined that the required evaporation amount JN has a fluctuation of a predetermined value or more (S4), and the process proceeds to S5.
(13) The calculation unit 43 determines that the change in the required evaporation amount JN is a decrease (S5), and proceeds to S12.
(14) The calculation unit 43 calculates the required evaporation amount JN (4400 (kg / h)), the total evaporation amount JR (= 6000 (kg / h)) of the boiler group 2, and the boilers 21,. Based on the first differential evaporation amount 1000 (kg / h) and the second differential evaporation amount 1500 (kg / h), the required evaporation amount JN (= 4400 (kg / h)) ≦ Determining that the second combustion position of the first boiler 21, the second combustion position of the second boiler 22, and the first combustion position of the fourth boiler 24 exist as combustion positions that can satisfy the total evaporation amount JR. (S12).
Since there exists a combustion position where the combustion can be canceled and shifted to the lower position while satisfying the required evaporation amount JN ≦ total evaporation amount JR, the routine proceeds to S13.
(15) The calculation unit 43 lists the combustion positions (or combinations of combustion positions) that can be shifted to the lower order from among the boilers 21,..., 25 (S13).
Specifically, for example, it is listed in the following procedure.
First, referring to the database based on the state of each boiler 21,..., 25 input via the input unit 41, the lower combustion position or combustion stop position in each boiler 21,. The difference evaporation amount and the transition time when the transition is made are calculated.
Here, the states of the boilers 21 to 25 in FIG. 5B are as follows.
Since the first boiler 21 and the second boiler 22 are at the second combustion position, when either the first boiler 21 or the second boiler 22 is shifted to the first combustion position, the total evaporation amount JR is 4500 ( kg / h), and the required evaporation amount JN (= 4400 (kg / h) can be secured. Further, the transition times for shifting the first boiler 21 and the second boiler 22 to the first combustion position are respectively 4.5 seconds (first boiler 21) and 4.0 seconds (second boiler).
Further, when the first boiler 21 and the second boiler 22 shift from the second combustion position to the combustion stop position, the total evaporation amount JR decreases to 3500 (kg / h), respectively, so the required evaporation amount JN (= 4400). Since it is impossible to ensure (kg / h), it is impossible to shift to the combustion stop position in any case.
The third boiler 23 is in the steaming transition process (second state), and since the fifth boiler 25 is in the combustion stop position, it cannot be shifted to the lower level.
Since the 4th boiler 24 is in the 1st combustion position, it can shift to a combustion stop position, and since total evaporation amount JR will be 5000 (kg / h) in that case, required evaporation amount JN (= 4400 (kg) / H)) can be secured. The transition time when the fourth boiler 24 transitions to the combustion stop position is 5.0 seconds.
Here, when an arbitrary plurality of combustion positions are shifted to the lower order from the first boiler 21, the second boiler 22, and the fourth boiler 24, the total evaporation amount JR is reduced by 2500 (kg / h) even at the minimum. 3500 (kg / h), and it is impossible to secure the required evaporation amount JN (= 4400). Therefore, the combustion position of the boiler selected from the first boiler 21, the second boiler 22, and the fourth boiler 24 is determined. It is only possible to shift one step down.
Therefore, the calculation unit 43
1) Transition the first boiler 21 to the first combustion position (transition time, 4.5 seconds)
2) Transition the second boiler 22 to the first combustion position (transition time, 4.0 seconds)
3) Move the fourth boiler 24 to the combustion stop position (transition time, 5.0 seconds)
Are listed (S13).
(16) From the list in S13, the transition time is the shortest time, and 2) the second boiler 22 is moved to the first combustion position (S14).
(17) Next, 2) selected in S14, 2) A signal for shifting the second boiler 22 to the first combustion position is output (S15).
As a result, as shown in FIG. 5C, the second boiler 22 moves to the first combustion position.
(18) The calculation unit 43 calculates (S16) the total evaporation amount JR (= 4500 (kg / h)) after the second boiler 22 is moved to the first combustion position, stores it in the memory 42, and stores it in S2. Transition.
At this time,
The required evaporation amount JN is 4400 (kg / h)
Total evaporation amount JR is 4500 (kg / h)
It is.

  According to the boiler system 1 according to the above-described embodiment, in the boiler group 2, when the boilers 21,..., 25 are transferred to other combustion positions or combustion stop positions, the transition time is set to the shortest time. Since another combustion position or combustion stop position is selected, the responsiveness of the boiler group 2 can be improved efficiently.

  Further, when each boiler 21,..., 25 is shifted to another combustion position or combustion stop position, a signal for shifting to another combustion position or combustion stop position is output for the boiler in the steaming transition process. Since the time from the first combustion position to the first combustion position until steaming is calculated as the transition time, the combustion position or the combustion stop position at which the transition time is the shortest time can be efficiently selected.

  Further, since each boiler 21,..., 25 is shifted to another combustion position or combustion stop position so that a total evaporation amount JR that satisfies the required evaporation amount JN corresponding to the required load is secured, load follow-up is performed. Efficiency can be improved efficiently.

Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.
For example, in the said embodiment, although the boiler group 2 which comprises the boiler system 1 demonstrated the case where it comprised from five three position control boilers, the structure of the boiler which forms the boiler group 2, and a boiler The number of units can be arbitrarily set. For example, a four-position control boiler or a boiler having a combustion position higher than that may be used, or a combination of boilers having different configurations such as the number of combustion positions and the amount of evaporation, etc. It goes without saying that may be configured.
Moreover, you may carry out combustion control for the one part boiler which can operate when some of the boilers which comprise the boiler group 2 are planned stop by failure, repair, etc. object.

Moreover, in the said embodiment, although the calculation object of the steaming transfer process which transfers to a 1st combustion position based on transfer time was demonstrated to the 1st state and the 2nd state, 1st based on transfer time was demonstrated. The calculation target of the steaming transition process that shifts to the combustion position can be arbitrarily set from among the first state, the second state, the third state, the fourth state, and the fifth state.
In the above-described embodiment, the case where the fifth state of the steaming transition process is the continuous pilot combustion state and the non-pressure state has been described, but instead of the continuous pilot combustion state or together with the continuous pilot combustion state, When the pressure is reduced from the second state to the no-pressure state, the pressure may be arbitrarily set from the case of the purge or pilot combustion state at the combustion stop position and the no-pressure state.

In the above embodiment, the case where the other combustion position or the combustion stop position is configured by one combustion position or the combustion stop position has been described. However, the other combustion position or the combustion stop position is defined as a plurality of combustion positions. Or you may comprise by a combustion stop position.
In addition, when other combustion positions or combustion stop positions are configured by a plurality of combustion positions or combustion stop positions, the combustion positions or combustion stop positions are sequentially shifted in order, and each combustion position or combustion stop position is The responsiveness of the boiler group 2 may be determined by summing the transition times, or the boiler group 2 may be determined with the shortest transition time physically realizable by performing part or all of the transition operations in parallel. The responsiveness may be determined.
Further, for example, when shifting to another combustion position, the transition from the combustion stop position to the first combustion position, the transition from the first combustion position to the second combustion position, and the second combustion position to the third combustion position. The substantial transition time may be shortened by performing the transition to (1) in parallel. In such a case, it goes without saying that parallel migration operations need not be started at the same time.

Further, when selecting another combustion position or combustion stop position, for example, the time required to ensure the required evaporation amount JN may be used as the transition time when determining the responsiveness of the boiler group 2.
Specifically, for example, by shifting from the first combustion position to the second combustion position, the transition of the combustion position where the evaporation amount increases by 1500 (kg / h) in 6.0 seconds, and the first stage of the steaming transition process The required evaporation amount JN = 800 (kg / h) under the situation where the shift from the state to the first combustion position makes it possible to select the combustion position shift where the evaporation amount is 1000 (kg / h) in 5.0 seconds. ), The latter is short in 5.0 seconds for the latter, but in order to ensure the required evaporation amount JN = 750 (kg / h), the former is 3.0 seconds and the latter Is 3.75 seconds, the former is more dominant, and in this case, which one to select may be arbitrarily set.

Moreover, in the said embodiment, although the case where the boiler with short time to steaming was selected among the boilers in a steaming transition process was demonstrated, each combustion position is based on the time until steaming. Multiple ranks (for example, a combustion position where the time from the current state to steaming is 5 seconds or less is rank A, and a combustion position where the time from the current state to steaming is more than 5 seconds and is 7 seconds or less is B If the combustion position belonging to rank A, which has a short time to steaming, can be selected from the candidate combustion positions, the combustion position of rank A is selected. A combustion position belonging to a rank having a high combustion efficiency may be preferentially selected and transferred, such as selecting a combustion position of rank B when the combustion position of rank does not exist.
In such a case, only the combustion positions belonging to a predetermined range in the time until steaming may be ranked, and the remaining combustion positions may be selected based on the time until steaming.

  Moreover, in the said embodiment, although the case where a boiler with short time to steaming was selected with reference to the 3rd database 45C among the boilers in a steaming transition process was demonstrated, it is other than databases, such as calculation It is possible to select by the means.

  In the above embodiment, after the program shifts to another combustion position or combustion stop position, another combustion position or combustion is set so that the total evaporation amount JR of the boiler group 2 secures the required evaporation amount JN. Although the case where the stop position is listed has been described, instead of the required evaporation amount JN, another combustion position or the combustion stop position is selected so that the total evaporation amount JR is within a predetermined range of the required evaporation amount JN. Alternatively, the boiler group 2 may be controlled based only on setting the transition time to the shortest time without considering the total evaporation amount JR.

  Moreover, in the said embodiment, each boiler 21, ..., 25 can be maintained in a steaming transition process, the transition time corresponding to each state of a steaming transition process is calculated, and each boiler 21, ..., 252 is controlled, but among the boilers 21, ..., 25, which boiler can be maintained in the steaming transition process, and each state of the steaming transition process It can be arbitrarily set which of (from the first state to the fifth state) is calculated by distinguishing the transition time from the combustion stop state to the first combustion position from the transition time from the combustion stop position.

  Moreover, in the said embodiment, although the case where the evaporation amount was controlled using the steam pressure and the target pressure in the steam header 6 as a physical quantity corresponding to the evaporation amount was described, the vapor use facility 18 replaces the pressure. The evaporation amount may be controlled using the evaporation amount or other physical quantity corresponding to the evaporation amount such as the amount of steam used.

  An example of the schematic configuration of the program according to the present invention is shown as a flowchart in FIG. 4, but it goes without saying that the program may be configured using a method (algorithm) other than the above flowchart.

In the above-described embodiment, the case where the control according to the present invention is performed by a program has been described. However, it is natural that the control may be performed by analog control using an operational amplifier or the like regardless of the program.
In executing the boiler group control method, for example, mechanical means such as a pressure regulator may be used in part or in whole.

  In the above embodiment, the case where the storage medium for storing the program is the ROM has been described. However, in addition to the ROM, for example, EP-ROM, hard disk, flexible disk, optical disk, magneto-optical disk, CD A ROM, CD-R, magnetic tape, nonvolatile memory card, or the like may be used. Further, not only the operation of the above-described embodiment is realized by executing the program read out by the arithmetic unit, but an OS (operating system) operating in the arithmetic unit based on an instruction of the program performs actual processing. This includes a case where the operation of the above embodiment is realized by performing part or all of the above. Furthermore, after the program read from the storage medium is written to the memory provided in the function expansion board inserted in the operation unit or the function expansion unit connected to the operation unit, the function expansion is performed based on the instructions of the program. It goes without saying that the case where the CPU or the like provided in the board or the function expansion unit performs part or all of the actual processing and the operation of the above-described embodiment is realized by the processing.

  In the boiler group, when shifting to another combustion position or combustion stop position, the response is improved by shifting in the shortest time, and therefore, it can be used industrially.

1 Boiler system 2 Boiler group 4 Controller (controller)
21, 22, 23, 24, 25 Boiler

Claims (6)

A program for controlling a boiler group including a boiler having a plurality of stepwise combustion positions,
When shifting to another combustion position or combustion stop position in the boiler,
Selecting the other combustion position or the combustion stop position to be transferred next so that the transition time when shifting to the other combustion position or the combustion stop position is the shortest time ;
Among the boilers, the boiler that is in the steaming transition process is configured to select the other combustion position or the combustion stop position to be transitioned next, using the time until steaming at the lowest combustion position as the transition time. A program characterized by being. The program according to claim 1 ,
A program configured to select the other combustion position or combustion stop position to be transferred next so as to ensure an evaporation amount corresponding to a required load in the boiler group. Controller, characterized in that it comprises a program according to claim 1 or 2. A boiler system comprising the controller according to claim 3 . A boiler group control method including a boiler having a plurality of stepwise combustion positions,
When shifting to another combustion position or combustion stop position in the boiler,
Selecting the other combustion position or the combustion stop position to be transferred next so that the transition time when shifting to the other combustion position or the combustion stop position is the shortest time ;
For the boiler that is in the steaming transition process among the boilers, the other combustion position or the combustion stop position to be transitioned next is selected using the transition time as the time until steaming at the lowest combustion position. The boiler group control method. The boiler group control method according to claim 5 ,
A control method for a boiler group, wherein the other combustion position or combustion stop position to be transferred next is selected so as to secure an evaporation amount corresponding to a required load in the boiler group.

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