JP2012032093A - Program, controller, and boiler system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a program, a controller and a boiler system, capable of smoothly increasing an evaporation amount regardless of the large or small total evaporation amount by improving load followability of a boiler group including boilers having a plurality of step-by-step combustion positions.SOLUTION: In the program for controlling the boiler group including the boilers having the plurality of step-by-step combustion positions, the first boiler group and the second boiler group for coping with variation of required load, are zoned. The first boiler group is constituted to control each boiler and the combustion position according to a necessary evaporation amount of the required load, and the second boiler group is constituted to control each boiler and the combustion position to compensate the load followability of the first boiler group, when the evaporation amount supplied in the first boiler group becomes insufficient due to variation of the necessary evaporation amount of the required load.

Description

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

As is well known, regarding the control of a boiler group having boilers having stepwise combustion positions with the same combustion amount (low combustion combustion amount: high combustion combustion amount 1: 2), while increasing the number of boilers to be burned, A technique for controlling the evaporation amount by sequentially shifting the combustion position of the boiler to the upper level is disclosed (for example, see Patent Document 1).
Moreover, when improving the load followability of a boiler group, the technique which preferentially controls combustion of a boiler with high load followability in a boiler group is disclosed (for example, refer patent document 2).

JP-A-10-227402 JP-A-2005-55014

However, the required load of the boiler group varies depending on various factors such as daily factors, time factors, operation factors, etc., and if such a required load is large or suddenly generated, the boiler group supplies As a result, there is a shortage of steam, and chattering due to time lag and boiler start / stop tends to occur.
Such sudden and large fluctuations in the required load may occur regardless of the total evaporation amount of the boiler group. If the total evaporation amount of the boiler group is small, the evaporation amount that can be increased in a short time. Is often small, and it is not easy to increase the evaporation amount rapidly.

  Further, when the boiler group includes a boiler having a large turndown ratio (maximum combustion amount / minimum combustion amount) (for example, low combustion position: middle combustion position: high combustion position = 1: 2: 5), When a combustion position with a large difference evaporation amount is turned on and off (virtual boiler is started and stopped), time lag and chattering tend to become significant.

  Therefore, when a significant increase in the required load occurs in the boiler group, the evaporation amount can be increased smoothly regardless of the total evaporation amount of the boiler group, thereby suppressing the occurrence of time lag and chattering. There is a technical demand for a boiler group with high load following capability.

  The present invention has been made in consideration of such circumstances, and enhances load followability of a group of boilers having boilers having a plurality of stepwise combustion positions, regardless of the total evaporation amount. An object of the present invention is to provide a program, a controller, and a boiler system that can increase the amount smoothly.

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 boilers having a plurality of stepwise combustion positions, the first boiler group corresponding to the magnitude of the required load, and the required load. The first boiler group controls each boiler and the combustion position according to the required evaporation amount of the required load, and the second boiler group When the fluctuation of the required evaporation amount causes a shortage in the evaporation amount steamed in the first boiler group, each boiler and the combustion position are controlled so as to compensate for the load followability of the first boiler group. It is comprised as follows.

  A thirteenth aspect of the present invention is a controller, comprising the program according to any one of the first to twelfth aspects.

  A fourteenth aspect of the present invention is a boiler system including the controller according to the thirteenth aspect.

According to the program according to the present invention, the boilers constituting the boiler group are classified into either the first boiler group or the second boiler group, and the required evaporation amount of the required load exceeds the capacity of the first boiler group. Until then, the boilers belonging to the second boiler group are not steamed, so the boilers belonging to the second boiler group are shifted to the steaming transition process to ensure a load following evaporation amount equivalent to the capacity of the second boiler group. can do. As a result, the load following evaporation amount corresponding to the second evaporation amount can be easily secured.
Further, when all the combustion positions of the boilers belonging to the first boiler group burn, the total load following evaporation amount of the boiler group becomes less than the second evaporation amount, but the maximum evaporation amount of the required load in a short time by the second boiler group. Therefore, it is possible to improve the load followability of the boiler group and to suppress the occurrence of time lag and hunting in the boiler group.

In this specification, to divide the first boiler group and the second boiler group,
1) Assign each boiler constituting the boiler group to either the first boiler group or the second boiler group 2) Either of the boilers constituting the boiler group is either the first boiler group or the second boiler group This means any concept of identifying which boiler group each boiler belongs to.

  In this specification, the capability of the first boiler group means the amount of evaporation that can output the combustion position of the operation target of each boiler belonging to the first boiler group, and the capability of the second boiler group means the second boiler group. It means the amount of evaporation that can output the combustion position of the operation target of each boiler belonging to the group.

  Invention of Claim 2 is a program of Claim 1, Comprising: The maximum evaporation amount of the said required load, the 1st evaporation amount smaller than the said maximum evaporation amount, and the said 1st evaporation amount in the said boiler group The first evaporation amount is allocated to the first boiler group on the basis of the increase amount of the evaporation amount with respect to the second evaporation amount corresponding thereto.

  According to the program according to the present invention, the boilers and combustion positions belonging to the first boiler group and the second boiler group are controlled based on the maximum evaporation amount of the required load, the first evaporation amount, and the second evaporation amount. Therefore, the total evaporation amount corresponding to the maximum evaporation amount of the required load, the first evaporation amount, the second evaporation amount (total evaporation amount of each boiler), and the total load following evaporation amount (of the load following evaporation amount of each boiler) It is possible to easily and efficiently cope with an increase in required load.

In this description,
1) The evaporation amount is the amount of vapor generated per unit time, and can be expressed by, for example, (kg / h).
2) The amount of evaporation of the boiler is the amount of evaporation output when the boiler being burned burns at the combustion position.
3) The total evaporation amount of the boiler group is the total evaporation amount output at the combustion position of the boiler burning in the boiler group.
4) The maximum evaporation amount of the required load is the maximum consumption amount of steam consumed in the required load (for example, steam use facility).
5) The maximum amount of evaporation of the boiler is the amount of evaporation that can be output by the target boiler, and is the rated amount of evaporation.
6) The first evaporation amount is related to the consumed steam amount of the required load, and it is recognized that the boiler group is less likely to cause rapid fluctuations in the evaporation amount, and it is possible to supply steam stably and easily. The basic evaporation amount of the group.
The first evaporation amount can be arbitrarily set based on the relative relationship with the required load. For example, the average value of the total evaporation amount, the steady evaporation amount with respect to the required load, the minimum evaporation amount during which the required load is in operation, The evaporation amount corresponding to the evaporation amount that the boiler group supplies for the longest time, etc., or any of these can be offset, or can be set within a predetermined range for any of these.
7) The steam supply in the boiler group, where the second evaporation amount is related to the required steam consumption and the boiler group is likely to fluctuate in evaporation amount, and it is necessary to increase the evaporation amount rapidly. The amount of fluctuation evaporation corresponding to the amount of fluctuation.
The second evaporation amount can be arbitrarily set in correspondence with the fluctuation of the evaporation amount based on the relative relationship with the required load. For example, the maximum value of the fluctuation range of the evaporation amount of the required load, the average of the fluctuation range The value, the minimum value of the fluctuation range, the steady value of the fluctuation range, etc., or any of these can be offset, or can be set within a predetermined range for any of these.
8) The relative relationship between the first evaporation amount, the second evaporation amount, and the maximum evaporation amount of the required load is, for example,
Maximum evaporation of required load = 1st evaporation + 2nd evaporation,
For example, as shown in FIG. 16, due to technical reasons in operation of the boiler group, the maximum evaporation amount of the required load is not satisfied even if the maximum evaporation amount of the required load = first evaporation amount + second evaporation amount does not hold. Is uniquely determined, the average value of the total evaporation amount is used for the first evaporation amount, and the maximum fluctuation range of the evaporation amount is used for the second evaporation amount.
Maximum evaporation amount of required load <first evaporation amount + second evaporation amount The relative relationship between the first evaporation amount and the second evaporation amount can be arbitrarily set in consideration of appropriateness. .
9) The maximum evaporation amount of the boiler group is the evaporation amount that can be output as the boiler group, and is the total of the maximum evaporation amount of the boilers (excluding spare cans) that make up the boiler group. The amount of evaporation.
10) The load following evaporation amount is an evaporation amount that any boiler can increase in a short time without causing a time lag in accordance with the increase or decrease of the required load.
11) The total load following evaporation amount is the evaporation amount that the boiler group can increase in a short time without causing a time lag according to the increase or decrease of the required load, and boilers constituting the boiler group (excluding spare cans) It is the total of the amount of load following evaporation.

  Invention of Claim 3 is a program of Claim 2, Comprising: The total load follow evaporation amount which totaled the load follow evaporation amount of each boiler of the said boiler group ensures the said 2nd evaporation amount. It is configured.

According to the program according to the present invention, since the total load following evaporation amount secures the total load following evaporation amount corresponding to the second evaporation amount, the increase in the evaporation amount corresponding to the second evaporation amount occurs in the required load. It is possible to easily and efficiently cope with an increase in required load.
As a result, the occurrence of a time lag with respect to the required load and the occurrence of chattering in the boiler group can be suppressed.

In this specification, “the total load following evaporation amount secures the second evaporation amount” means that the total load following evaporation amount secures an evaporation amount corresponding to the second evaporation amount and is equal to the second evaporation amount. It means that the amount of evaporation can be increased in a short time.
Further, as a means for securing the evaporation amount, the total load following evaporation amount may be set within a predetermined range with respect to the evaporation amount corresponding to the second evaporation amount, and the concept of the predetermined range includes, for example,
1) Being equal to or greater than the evaporation amount corresponding to the second evaporation amount 2) Being a range having a lower limit and an upper limit with respect to the evaporation amount corresponding to the second evaporation amount 3) A predetermined difference with respect to the second evaporation amount And having the relationship of 1) or 2) above with respect to the set evaporation amount.

  The invention according to claim 4 is the program according to claim 3, wherein the second evaporation amount is set by setting the total load following evaporation amount within a predetermined range with respect to the second evaporation amount. It is configured to ensure.

  According to the program according to the present invention, each boiler and the combustion position are controlled so that the total load following evaporation amount of the boiler group is within a predetermined range with respect to the second evaporation amount. It can be secured efficiently.

  Invention of Claim 5 is a program of Claim 3 or Claim 4, Comprising: The said 2nd evaporation amount is ensured by making the said total load following evaporation amount more than the said 2nd evaporation amount. It is comprised so that it may do.

  According to the program according to the present invention, each boiler and the combustion position are controlled so that the total load following evaporation amount of the boiler group is equal to or larger than the second evaporation amount. Therefore, the load followability of the boiler group can be easily and efficiently performed. Can be secured.

  The invention according to claim 6 is the program according to any one of claims 3 to 5, wherein the first boiler group and the second boiler are added when the total load following evaporation amount is summed. The group is configured to calculate an evaporation amount that increases when the boiler during combustion shifts from the combustion position during combustion to the highest combustion position.

  According to the program according to the present invention, in the first boiler group and the second boiler group, each boiler that is steamed at a combustion position lower than the highest combustion position is moved from the combustion position during combustion (of the operation target). ) The total load following evaporation amount is calculated for the amount of evaporation that increases when moving to the uppermost combustion position, and the load following evaporation amount corresponding to the second evaporation amount is secured, so the evaporation amount can be increased in a short time It is possible to improve load followability easily and reliably.

  In this specification, the uppermost combustion position when calculating the “evaporation amount that increases when moving to the uppermost combustion position” refers to the uppermost combustion target of each boiler when calculating the load following evaporation amount. Refers to the combustion position.

  The invention according to claim 7 is the program according to any one of claims 3 to 5, wherein when the total load following evaporation amount is summed, the first boiler group and the second boiler In a group, the amount of evaporation that increases when the burning boiler moves from the burning combustion position to the uppermost combustion position, and the amount of evaporation that increases when the boiler in the steaming transition process moves to the lowermost combustion position It is characterized by calculating for the object.

According to the program according to the present invention, when the total load following evaporation amount corresponding to the second evaporation amount is ensured, in the first boiler group and the second boiler group, the combustion position is lower than the uppermost combustion position. The amount of evaporation that increases when each steaming boiler is moved from the combustion position during combustion to the highest combustion position (to be operated), and the boiler that is in the steaming transition process is moved from the steaming transition process to the lowest combustion position. The total evaporation amount (corresponding to the first difference evaporation amount) that increases when the process shifts to is calculated.
As a result, when any boiler at the combustion stop position shifts to the steaming transition process, the amount of evaporation that increases when the boiler shifts from the steaming transition process to the lowest combustion position (the first boiler Since the total load following evaporation amount is calculated with the difference evaporation amount equivalent) as the total object, it is easy to eliminate the decrease in load following evaporation amount due to the transition to the upper combustion position of the steaming boiler. Load followability can be improved easily and efficiently.

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.

Further, in this specification, the amount of evaporation that increases when the boiler is moved to a higher combustion position, that is, the amount of evaporation at the combustion position after the transition and the evaporation at the combustion stop position (or combustion position) before the transition. The difference from the amount is called the difference evaporation amount.
Further, the amount of evaporation that increases by moving up one level and becoming the Nth combustion position (N is an integer equal to or greater than 1) is expressed as “the difference evaporation amount at the Nth combustion position” or “the Nth difference evaporation amount”. For example, the amount of evaporation that increases when shifting from the combustion stop position to the first combustion position is referred to as “difference evaporation amount of the first combustion position” or “first difference evaporation amount” and the first combustion position. The amount of evaporation that increases when shifting to the second combustion position is referred to as “the difference evaporation amount at the second combustion position” or “the second difference evaporation amount”.

  The invention according to claim 8 is the program according to any one of claims 3 to 5, wherein when the total load following evaporation amount is summed, the first boiler group and the second boiler In a group, the amount of evaporation that increases when the burning boiler shifts from the burning combustion position to the uppermost combustion position, and the amount of evaporation that increases when the boiler in the steaming transition process moves to the uppermost combustion position It is characterized by calculating for the object.

According to the program according to the present invention, when the total load following evaporation amount corresponding to the second evaporation amount is ensured, in the first boiler group and the second boiler group, the combustion position is lower than the uppermost combustion position. The amount of evaporation that increases when each steaming boiler is moved from the burning combustion position to the uppermost combustion position (operation target), and the boilers that are in the steaming transition process are ) Calculate the sum of the amount of evaporation that increases when moving to the uppermost combustion position.
As a result, by transferring any boiler in the combustion stop position to the steaming transition process, the total amount of evaporation increased when the boiler is transitioned from the steaming transition process to the highest combustion position. Since the follow-up evaporation amount is calculated, it is easy to eliminate the decrease in load follow-up evaporation amount due to the transition to the upper combustion position of the steaming boiler, and the load followability of the boiler group can be improved easily and efficiently. Can do.
In addition, the amount of evaporation that increases when the boiler in the steaming transition process shifts to the highest combustion position is included in the total load following evaporation amount, thereby reducing the number of boilers that transition to the steaming transition process. Excessive energy consumption can be suppressed.

  Invention of Claim 9 is a program of any one of Claim 6-8, Comprising: When increasing the evaporation amount of the said 1st boiler group, The combustion position in combustion, Each boiler and the combustion position are controlled so that the total evaporation amount by the combination with the combustion position selected from the combustion positions that can be sequentially shifted from the combustion position during the combustion is minimized. It is characterized by that.

  According to the program according to the present invention, when securing the total load following evaporation amount of the boiler group, a combination of combustion positions that can be configured by sequentially shifting from a combination of combustion positions that are currently burning (selected boilers) And the combustion position) are extracted, and the combination of the combustion positions that minimizes the total evaporation amount is selected from them, so that it is possible to suppress excessive energy consumption while ensuring the load followability of the boiler group.

  A tenth aspect of the invention is the program according to the ninth aspect, wherein when a combination that minimizes the total evaporation amount is set, the combustion position during the combustion and the combustion position during the combustion are determined. Each boiler and combustion position is selected from a combination of combustion positions selected from the combustion positions that can be sequentially shifted from the variable evaporation amount or a combination extracted based on the predetermined range of the variable evaporation amount. It is comprised so that it may control.

  According to the program according to the present invention, the set load following evaporation amount corresponding to the second evaporation amount from among the combinations in which the total load following evaporation amount can be configured by sequentially shifting the combustion position from the combination of the combustion positions at which combustion is currently performed. The combination of the target combustion positions is extracted so as to secure the combustion position, and the combination of the combustion positions that minimizes the total evaporation amount is selected from the extracted combinations of the combustion positions. As a result, it is possible to easily and efficiently select a combination of combustion positions that minimizes the total evaporation amount while ensuring the total load following evaporation amount.

  Invention of Claim 11 is a program of any one of Claim 2-10, Comprising: In the said 1st boiler group, the combustion position of the transfer destination accompanying the increase in the said evaporation amount is said The boiler which is the combustion position corresponding to the first evaporation amount is configured to control each boiler and the combustion position in preference to the boiler whose combustion position corresponding to the second evaporation amount corresponds to the second evaporation amount. It is characterized by being.

  According to the program according to the present invention, the boiler whose transition destination combustion position corresponding to the increase in the evaporation amount is the combustion position corresponding to the first evaporation amount is used, and the combustion position whose transition destination combustion position corresponds to the second evaporation amount. Each boiler and the combustion position are controlled in preference to the boiler. As a result, the combustion at the highest combustion position among the combustion positions corresponding to the first evaporation amount is performed for a long time.

  The invention according to claim 12 is the program according to any one of claims 2 to 11, wherein the boiler that burns the first evaporation amount for the longest time when the boiler group is operated. And it is comprised so that it may set corresponding to the combination of a combustion position.

  According to the program according to the present invention, since the first evaporation amount is set corresponding to the combination of the boiler that burns for the longest time and the combustion position, the combustion position corresponding to the first evaporation amount is set to the highest combustion position. By setting advantageous attributes such as high-efficiency combustion and short-time transition, the combustion efficiency and load followability of the boiler group can be improved efficiently.

  The invention according to claim 15 is the boiler system according to claim 14, wherein the highest combustion position among the combustion positions corresponding to the first evaporation amount of each boiler is a high efficiency combustion position. It is characterized by that.

  According to the boiler system of the present invention, since the highest combustion position among the combustion positions corresponding to the first evaporation amount is the high efficiency combustion position, the combustion efficiency of the first boiler group and consequently the boiler group Combustion efficiency can be improved efficiently.

According to the program, the controller, and the boiler system according to the present invention, it is possible to easily improve the load followability of a boiler group including a boiler having a plurality of stepwise combustion positions. As a result, the evaporation amount can be increased smoothly regardless of the total evaporation amount of the boiler group.
Moreover, highly efficient combustion is realizable, ensuring the load followability of a boiler group.

It is a figure showing the outline of the boiler system concerning a 1st embodiment of the present invention. It is a figure explaining the schematic structure and effect | action of the boiler group which concern on 1st Embodiment. It is a figure which shows an example of the database which concerns on 1st Embodiment. It is a flowchart explaining an example of the program which concerns on 1st Embodiment. It is a figure explaining the effect | action of the boiler group which concerns on 1st Embodiment. It is a figure which shows the outline of the boiler system which concerns on the 2nd Embodiment of this invention. It is a figure explaining the schematic structure of the boiler group which concerns on 2nd Embodiment. It is a figure which shows an example of the database which concerns on 2nd Embodiment. It is a block diagram explaining an example of the program which concerns on 2nd Embodiment. It is a flowchart explaining an example of the program which concerns on 2nd Embodiment. It is a figure explaining an example of the combination of the combustion position by the program which concerns on 2nd Embodiment. It is the schematic explaining an example of operation | movement of the boiler system which concerns on 2nd Embodiment. It is a figure explaining the schematic structure and effect | action of the boiler group which concern on 3rd Embodiment. It is a figure explaining the schematic structure and effect | action of the boiler group which concerns on 4th Embodiment. It is a figure explaining the schematic structure and effect | action of the boiler group which concerns on 5th Embodiment. It is a figure explaining the outline of the maximum evaporation amount of the required load which concerns on this invention, 1st evaporation amount, and 2nd evaporation amount.

The first embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a diagram showing a boiler system according to a first embodiment of the present invention, and reference numeral 1 indicates a boiler system.

  As shown in FIG. 1, the boiler system 1 includes, for example, a boiler group 2 composed of four boilers, a control unit (controller) 4, a steam header 6, and steam pressure in the steam header 6 ( And a pressure sensor 7 that detects a vaporization amount and a corresponding physical amount), and supplies steam generated in the boiler group 2 in accordance with a required load of the steam use facility 18.

  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 required evaporation amount corresponding to the consumption steam quantity of the steam using equipment 18 based on this pressure. Is calculated.

  As shown in FIG. 2, the boiler group 2 includes a first boiler 21, a second boiler 22, a third boiler 23, and a fourth boiler 24, and the boiler group 2 is controlled by the control unit 4 in the first boiler group 2 </ b> A. And the second boiler group 2B.

FIG. 2 is a diagram conceptually showing the boilers 21,..., 24 constituting the boiler group 2, and each frame represents the boilers 21,. , 24 are divided into sections indicating the combustion position, and the lower side of the figure represents the first combustion position.
Further, numerals 1000 and 1500 shown at each combustion position are the difference evaporation amount (kg / h) at each combustion position, and the numbers indicated by () beside the difference evaporation amount (kg / h) are shown in FIG. When the flowchart is executed, the combustion order (operation order) of the combustion positions selected by the control unit 4 is shown.
Also, the numbers in parentheses above each frame indicate the priority in increasing the evaporation amount, and the description of (preliminary) indicates that the combustion position is a preliminary can (non-operation target combustion position).

  In this embodiment, the first boiler group 2 </ b> A has a first boiler 21 and a second boiler 22, and the second boiler group 2 </ b> B has a third boiler 23 and a fourth boiler 24.

The first boiler 21 and the second boiler 22 are in a combustion stop state (combustion stop position), a low combustion state (first combustion position), a middle combustion state (second combustion position), and a high combustion state (third combustion position), respectively. These four-stage boilers can be controlled in four stages of combustion, each having a first differential evaporation amount of 1000 (kg / h), a second differential evaporation amount of 1000 (kg / h), and a third differential evaporation amount. Is 1000 (kg / h) and the rated evaporation is 3000 (kg / h).
Moreover, the 1st boiler 21 and the 2nd boiler 22 are set as the highly efficient combustion position in the 2nd combustion position, respectively.

The third boiler 23 and the fourth boiler 24 are controlled in three stages of combustion states of a combustion stop state (combustion stop position), a low combustion state (first combustion position), and a high combustion state (second combustion position), respectively. Possible three-position boilers, the first differential evaporation amount is 1000 (kg / h), the second differential evaporation amount is 1500 (kg / h), and the rated evaporation amount is 2500 (kg / h). .
Moreover, as for the 3rd boiler 23 and the 4th boiler 24, each 1st combustion position is made into the highly efficient combustion position.

In the first embodiment, the first evaporation amount JS1 is, for example, an average evaporation amount that is steamed for the longest time in the boiler group 2, and the first combustion position, the second combustion position, and the first combustion position of the first boiler 21. The first combustion position and the second combustion position of the two boilers 22 are assigned to the first evaporation amount JS1.
The second evaporation amount JS2 is a fluctuation range of the evaporation amount that fluctuates beyond the first evaporation amount JS1, and the third combustion position of the first boiler 21, the third combustion position of the second boiler 22, and the third boiler. The first combustion position, the second combustion position, and the first combustion position of the fourth boiler are assigned.

In this embodiment, the priorities and spare cans of the boilers 21,..., 24 are automatically set, and the first boiler 21 and the second boiler 22 are the high-efficiency combustion positions according to the priorities. When the first and second boilers 21 and 22 are both in the second combustion position (the intermediate combustion state) and the second combustion position (the boiler with the high-efficiency combustion position set as a spare can) is present, After reaching the (position), according to the priority order, the first boiler 21 and the second boiler 22 are sequentially shifted to a higher combustion state than the high efficiency combustion position.
It should be noted that whether the priority order and the spare can are set automatically or manually may be arbitrarily set.

Further, when the boilers 21,..., 24 are in the steaming transition process, the boilers are allowed to steam by moving to the first combustion position in a short time, and the total load following evaporation is performed in the steaming transition process. By ensuring the amount, the load followability can be improved.
In this embodiment, the steaming transition process refers to the period from the combustion stop position in each boiler 21,..., 24 to the first combustion position that is the lowest combustion position until steaming. The transition process can be classified into the following first state to 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)
When steaming in a short time, the above 1) and 2) are suitable, but 3) to 5) may be applied.

  The control unit 4 calculates the maximum evaporation amount JM of the required load based on the input first evaporation amount JS1 and the second evaporation amount JS2, and the operation target combustion position in the boiler group 2 based on the maximum evaporation amount JM. And a spare can is set.

In this embodiment, the first evaporation amount JS1 is a steady evaporation amount in the boiler group 2 (for example, an average value of the evaporation amount supplied by the boiler group 2), and the second evaporation amount JS2 is an evaporation exceeding the first evaporation amount JS1. The amount of fluctuation is assumed.
Further, the required load maximum evaporation amount JM = first evaporation amount JS1 + second evaporation amount JS2, and the first evaporation amount JS1 is the first combustion of the first boiler 21 and the second boiler 22 belonging to the first boiler 2A. Steam is supplied according to the position and the second combustion position.

In addition, the control unit 4 classifies each of the boilers 21,..., 24 as belonging to the first boiler group 2A or the second boiler group 2B, and determines which of the boilers belonging to the first boiler group 2A. It is determined whether or not the first evaporation amount JS1 corresponds to the combustion position. As a result, the combustion position of each boiler belonging to the first boiler group 2A corresponds to either the first evaporation amount JS1 or the second evaporation amount JS2.
The control unit 4 determines whether each boiler 21, ..., 24 belongs to the first boiler group 2A, the second boiler group 2B, and each combustion position of each boiler belonging to the first boiler group 2A. The memory 42 stores, for example, which of the first evaporation amount JS1 and the second evaporation amount JS2 corresponds to.

  Further, when the control unit 4 divides the boiler group 2 into the first boiler group 2A and the second boiler group 2B, for example, the total evaporation amount at the high-efficiency combustion position of each boiler belonging to the first boiler group 2A. Is compared with the first evaporation amount JS1, and the target boiler belonging to the first boiler group 2A is selected, and the number of boilers is confirmed.

Note that, in the boilers belonging to the first boiler group 2A, when there is a boiler whose uppermost combustion position does not coincide with the high efficiency combustion position among the combustion positions corresponding to the first evaporation amount JS1, the control unit 4 For example, a combustion position combination that maximizes the combustion efficiency of the boiler group 2 when all of the combustion positions corresponding to the first evaporation amount JS1 are steamed is set.
Further, when there is a boiler in which the highest combustion position does not coincide with the high efficiency combustion position among the combustion positions corresponding to the first evaporation amount JS1, instead of setting the combustion efficiency of the boiler group 2 to the highest efficiency, For example, the combustion efficiency of the first boiler group 2A is set to the highest efficiency, or as many as possible of the boilers belonging to the first boiler group 2A have the highest combustion position among the combustion positions corresponding to the first evaporation amount JS1. You may comprise so that it may correspond with a position.

In the first embodiment, the setting of the combustion position corresponding to the first evaporation amount JS1 and the second evaporation amount JS2 is determined by the combination of the combustion positions corresponding to the first evaporation amount JS1 and the second evaporation amount JS2. The output (the total difference evaporation amount of the combustion position combination) is configured to be equal to or greater than the first evaporation amount JS1 and the second evaporation amount JS2.
As a result, the maximum evaporation amount of the boiler group is set to satisfy the maximum evaporation amount JM of the required load, and the combustion positions (operation target combustion positions) corresponding to the first evaporation amount JS1 and the second evaporation amount JS2 are set. By doing this, the non-operation target combustion position (preliminary can) is set.
Whether each combustion position is to be operated or not is set based on the priority order of the boilers 21,.
Further, the evaporation amount corresponding to the second evaporation amount JS2 is set as the set load following evaporation amount JT.

  Further, the control unit 4 determines that the boiler group 2 satisfies the priority order so that the total evaporation amount JR satisfies the required evaporation amount JN, and the total load following evaporation amount JG secures the set load following evaporation amount JT. Select the combustion position (including the combustion stop position).

Further, when selecting the boiler and the combustion position (including the combustion stop position), the first boiler 21 and the second boiler 22 that belong to the first boiler group 2A and are the operation targets are both in the second combustion position (high efficiency). After reaching the combustion position), the first boiler 21 and the second boiler 22 are shifted to a third combustion position higher than the high efficiency combustion position in accordance with the priority order.
If either the total evaporation amount JR that satisfies the required evaporation amount JN or the total load following evaporation amount JG that satisfies the set load following evaporation amount JT cannot be secured, the total evaporation amount JR is given priority. ing.

  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. 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 inputted from the pressure sensor 7 and the signals inputted from the boilers 21,..., 24 (for example, information such as the combustion position) to the calculation unit 43. It has become.

  The output unit 46 is connected to each boiler 21,..., 24 through the signal line 14, and outputs the control signal output from the calculation unit 43 to each boiler 21,.

  The calculation unit 43 reads and executes a program stored in a storage medium (for example, ROM) of the memory 42 to calculate the evaporation amount corresponding to the required load, the combination of the boilers to be burned in the boiler group 2 and their combustion positions. Based on the result, a control signal is output to the boilers 21,..., 24 via the output unit 46.

The database 45 includes a first database 45A, a second database 45B, and a third database 45C.
The first database 45A stores numerical data indicating the relationship between the pressure signal (mV) and the pressure P (t) (Pa) in the form of a data table (not shown). The pressure P (t) in the steam header 6 is calculated by comparing with the pressure signal (mV) from 7.

  In the second database 45B, numerical data indicating the relationship between the target pressure PT of the steam header 6 in the boiler group 2 and the evaporation amount for forming the target pressure PT is stored as a data table. Is obtained by referring to the data table based on the pressure P (t) in the steam header 6 input from the input unit 41.

  In addition, the third database 45C includes, for example, as shown in FIG. 3, the differential evaporation amount Ji (j) of each combustion position of each boiler 21,..., 24 and each boiler 21,. Is stored in the form of a data table in the form of a data table indicating the total load following evaporation amount GiA (j), GiB (j), GiC (j) in the steam supply transition process and each combustion position.

  Here, i (= 21, 22, 23, 24) in FIG. 3 indicates a code for specifying the boiler, and j (= 0, 1, 2) indicates a code for specifying the combustion position. In addition, j = 0 indicates that the pressure keeping state is set in the steaming transition process (any one of the first state to the third state is set), and Gi (0) is the pressure keeping state in the steaming transition process. It means the total load following evaporation amount in the state.

Further, the total load following evaporation amount GiA (j), the total load following evaporation amount GiB (j), and the total load following evaporation amount GiC (j) shown in FIG. 3 are calculated as follows. .
Total load following evaporation amount GiA (j); subject to the amount of evaporation that increases when shifting from the combustion position during combustion to the highest combustion position Total load following evaporation amount GiB (j); Top combustion from the combustion position during combustion Evaporation amount that increases when it shifts to the position, and evaporation amount that increases when the boiler in the steaming transition process shifts to the lowest combustion position Target total load following evaporation amount GiC (j); Combustion position during combustion Evaporation amount that increases when it shifts from the highest combustion position to the uppermost combustion position, and evaporation amount that increases when the boiler in the steaming transition process shifts to the uppermost combustion position In this embodiment, the total load following evaporation amount JG Is calculated by adding up the total load following evaporation amount GiC (j) corresponding to the combustion position or steaming transition process of each boiler 21,...

  The calculation unit 43 refers to the third database 45C to ensure that the total evaporation amount JR and the total load following evaporation amount JG satisfying the required evaporation amount JN, the set load following evaporation amount JT, and the boiler and combustion position ( (Including the combustion stop position) is selected (calculated).

  Further, when changing the priority order and changing the setting of the spare can, the calculation unit 43 causes the evaporation amount that can be output depending on the combustion position of the operation target of the boiler group 2 to be equal to or greater than the maximum evaporation amount JM of the required load. In addition, a spare can in the boiler group 2 is set.

  The steam header 6 is connected to the first boiler 21,..., The fourth boiler 24 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.

Hereinafter, an example of a program flow according to the first embodiment will be described with reference to FIG. FIG. 4 shows an example of increasing the total evaporation amount JR. For the total evaporation amount JR, only one combustion position is shifted to the combustion state at a time, and the total load following evaporation amount JG is The set load following evaporation amount JT (= second evaporation amount JS2) is ensured as much as possible.
(1) First, the required evaporation amount JN corresponding to the required load of the boiler group 2, the total evaporation amount JR that is the sum of the evaporation amounts of the boilers 21,..., 24, and the loads of the boilers 21,. An initial value (= 0) is set for each of the total load following evaporation amounts JG obtained by adding the following evaporation amounts, and the first evaporation amount (for example, the average output of the boiler group 2) JS1 and the first evaporation in the boiler group 2 are set. A second evaporation amount JS2 and a set load following evaporation amount JT (= JS2) corresponding to the increase amount of the evaporation amount with respect to the amount are set (S1).
The total load following evaporation amount JG is the sum of the total load following evaporation amount of the first boiler group 2A and the total load following evaporation amount of the second boiler group 2B.
(2) Next, the first evaporation amount JS1 and the second evaporation amount JS2 are summed to calculate the maximum evaporation amount JM of the required load. The calculated maximum evaporation amount JM of the required load is stored in the memory 42 (S2).
(3) Next, the boiler and the combustion position to be operated are set based on the maximum evaporation amount JM of the required load (S3). The combustion position to be operated is stored in the memory 42.
At this time, the boiler to be operated and the combustion position are set so that the amount of evaporation that can be output according to the combustion position of the operation target of the boiler group 2 ≧ the maximum evaporation amount JM of the required load.
(4) The calculation unit 43 divides the boilers to be operated in the boiler group 2 into the first boiler group 2A and the second boiler group 2B, and at each combustion position that is the operation target in the first boiler group 2A, Assigned to either the first evaporation amount JS1 or the second evaporation amount JS2 (S4).
The combustion position of the second boiler group 2B is not assigned to the first evaporation amount JS1, but is assigned to the second evaporation amount JS2 so as to ensure the maximum evaporation amount JM of the required load.
Here, when the calculation unit 43 divides the boiler group 2 into the first boiler group 2A and the second boiler group 2B, for example, the evaporation amount at each high-efficiency combustion position of the boilers belonging to the first boiler group 2A. The minimum number of boilers whose total is equal to or greater than the first evaporation amount JS1 is selected as the target boiler of the first boiler group 2A. However, the first boiler group 2A is based on other definitions, for example, the total evaporation amount at each highly efficient combustion position of the boilers belonging to the first boiler group 2A is within a predetermined range with respect to the first evaporation amount JS1. May be selected as the target boiler.
(5) It is determined whether the boiler group 2 is in operation (S5).
When the boiler group 2 is in operation, the process proceeds to S6, and when it is not in operation, the program is terminated.
(6) The computing unit 43 calculates the required evaporation amount JN (S6). The calculated required evaporation amount JN is stored in the memory 42.
(7) The computing unit 43 compares the required evaporation amount JN calculated in S6 with the total evaporation amount JR stored in the memory 42, and determines whether or not the total evaporation amount JR <the required evaporation amount JN. (S7).
If the total evaporation amount JR <required evaporation amount JN is satisfied, the process proceeds to S8. If the total evaporation amount JR <required evaporation amount JN is not satisfied, the process proceeds to S5.
(8) In the first boiler group 2A, the calculation unit 43 is in the combustion position or the combustion stop position less than the high efficiency combustion position (second combustion position), and is the upper combustion that is the operation target below the high efficiency combustion position. It is determined whether there is a boiler that can be moved to a position (S8).
In the first boiler group 2A, a boiler that is assigned to the first evaporation amount and is at a combustion position less than the high-efficiency combustion position (second combustion position) or at a combustion stop position and can be shifted to a higher combustion position that is an operation target. If it exists, the process proceeds to S9, and if it does not exist, the process proceeds to S15.
(9) The calculating unit 43 outputs a signal that belongs to the boiler group 2A and that is below the high-efficiency combustion position and that sequentially shifts the highest priority boiler to the combustion position one level higher (S9).
In this embodiment, when the boiler with the highest priority is sequentially shifted to the combustion position one level higher, for example, when all the boilers belonging to the first boiler group 2A are at the combustion position of the same stage, the priority order When the first-ranked boiler is moved to the upper combustion position and some of the boilers belonging to the first boiler group 2A are in the higher combustion position, among the boilers not in the higher combustion position, the priority order is This means that the highest priority boiler is moved to the combustion position one level higher.
If a signal is output, it will transfer to S10.
(10) The calculation unit 43 refers to the third database 45C and calculates the total evaporation amount JR after the transition (S10). The calculated total evaporation amount JR is stored in the memory 42. If S10 is performed, it will transfer to S11.
(11) The computing unit 43 refers to the third database 45C and calculates the total load following evaporation amount JG (S11). The calculated total load following evaporation amount JG is stored in the memory 42. If S11 is performed, it will transfer to S12.
(12) The computing unit 43 compares the total load following evaporation amount JG with the set load following evaporation amount JT stored in the memory 42, and (total load following evaporation amount JG <set load following evaporation amount JT). It is determined whether or not there is (S12).
If (total load following evaporation amount JG <set load following evaporation amount JT), the process proceeds to S13. If (total load following evaporation amount JG <set load following evaporation amount JT), the process proceeds to S5.
(13) The computing unit 43 determines whether there is a boiler that is in the combustion stop position and can be shifted to the steaming transition process (S13).
If there is a boiler at the combustion stop position that can be transferred to the steaming transition process, the process proceeds to S14, and if there is no boiler at the combustion stop position that can be transferred to the steaming transition process, the process proceeds to S5.
(14) The calculation unit 43 outputs a signal for transferring the boiler having the highest priority among the boilers at the combustion stop position and capable of shifting to the steaming transition process to the steaming transition process (S14). If a signal is output, it will transfer to S11.
(15) In the first boiler group 2A, the calculation unit 43 determines whether or not there is a boiler that burns at the high-efficiency combustion position or higher and can move to the higher combustion position (S15).
In the first boiler group 2A, if there is a boiler that is burning at the high efficiency combustion position or higher and can be transferred to the upper combustion position, the process proceeds to S16, and in the first boiler group 2A, the process proceeds to the upper combustion position. If there is no possible boiler, the process proceeds to S17.
(16) The computing unit 43 outputs a signal for shifting the boiler having the highest priority in the combustion order at the high efficiency combustion position or higher to the combustion position one level higher (S16). If a signal is output, it will transfer to S10.
(17) The computing unit 43 determines whether there is a boiler that can move to a higher combustion position in the second boiler group 2B (S17).
If there is a boiler that can move to the upper combustion position in the second boiler group 2B, the process proceeds to S18. If there is no boiler that can move to the upper combustion position in the second boiler group 2B, the process proceeds to S5. To do.
(18) The computing unit 43 determines whether there is a combustion boiler that can move to a higher combustion position in the second boiler group 2B (S18).
In the second boiler group 2B, when there is a burning boiler that can be transferred to a higher combustion position, the process proceeds to S19, and when there is no burning boiler that can be transferred to a higher combustion position, the process proceeds to S20. .
(19) In the second boiler group 2B, the calculation unit 43 outputs a signal for shifting the boiler that is burning and having the highest priority to the combustion position one level higher (S19). If a signal is output, it will transfer to S10.
(20) In the second boiler group 2B, the calculation unit 43 outputs a signal for transferring the boiler that is in the combustion stop position and has the highest priority to the first combustion position (S20). If a signal is output, it will transfer to S10.
The above (5) to (20) are repeatedly executed.

Next, the operation of the boiler system 1 will be described with reference to FIG.
FIG. 5 shows the required evaporation amount JN and the total evaporation amount JR to cope with the increase in the required evaporation amount JN when the boiler system 1 increases the total evaporation amount JR in the operation sequence shown in FIG. It is the table | surface which showed the total load tracking evaporation amount JG. In addition, the shaded portion shown in FIG. 5 indicates the timing at which each boiler is in the steaming transition process.
The transition of the combustion position of the boiler group 2 in such an operation is as follows. In the boiler system 1, the first evaporation amount JS1 is 3800 (kg / h), the second evaporation amount JS2, that is, the set load following evaporation amount JT is 5000 (kg / h).

First, when the operation is started, the calculation unit 43 executes S1 and S2, and the maximum evaporation amount JM of the required load (= first evaporation amount JS1 + second evaporation amount JS2) (= 8800 (kg / h)) ) Is calculated.
Next, S3 is performed and the operation target boiler in the boiler group 2 is set. Thereby, a spare can is set (S3). Since the maximum evaporation amount JM of the required load is 8800 (kg / h), the second combustion position of the fourth boiler 24 is set to the spare can according to the priority order.

  Moreover, the calculating part 43 performs S4, the boiler (1st boiler 21, the 2nd boiler 22, the 3rd boiler 23, the 4th boiler 24) used as the driving | running | working object is used for 1st boiler group 2A and 2nd. It divides into the boiler group 2B, and the combustion position of the boiler which belongs to the 1st boiler group 2A is allocated to either the 1st evaporation amount JS1 or the 2nd evaporation amount JS2 (S4). Further, the combustion position of the second boiler group 2B is assigned to the second evaporation amount JS2 so that the maximum evaporation amount JM of the required load is ensured.

In this embodiment, since the first evaporation amount JS1 is 3800 (kg / h), when the boilers 21,..., 24 are assigned according to the priority order, the first boiler 21 and the second boiler 22 ( In any case, when the evaporation amount at the high-efficiency combustion position = 2000 (kg / h) is assigned, the total evaporation amount at the high-efficiency combustion position becomes 4000 (kg / h), and the first evaporation amount JS1 (= 3800 ( kg / h) or more, the first boiler 21 and the second boiler 22 are selected as targets of the first boiler group 2A.
As a result, the second combustion positions of the first boiler 21 and the second boiler 22 are assigned to the combustion positions corresponding to the first evaporation amount JS1.
Next, S5 and S6 are executed in order.
If the required evaporation amount JN calculated in S6 is zero, the total evaporation amount JR <required evaporation amount JN (zero) does not hold in S7, and the process proceeds to S5.
S5, S6, and S7 are repeated until the required evaporation amount JN> 0 (kg / h).

(1) Next, when the required evaporation amount JN exceeds zero, the calculation unit 43 executes S5, S6, S7, and S8 in order, and in S8, the first boiler group 2A has a combustion stop position (second combustion position). Less than) first boiler 21 exists, S9 is executed.
If S9 is performed, the 1st combustion position of the 1st boiler 21 will be in a combustion state.
Thereafter, S10 and S11 are executed to calculate the total evaporation amount JR as 1000 (kg / h) and the total load following evaporation amount JG as 2000 (kg / h).
Next, when S12 is executed, since total load following evaporation amount JG (2000 (kg / h)) <set load following evaporation amount JT (= 5000 (kg / h)), S13 is executed next, and in S13 Since it is determined that there is a boiler at the combustion stop position (the second boiler 22, the third boiler 23, the fourth boiler 24), S14 is executed and the second boiler 22 having the highest priority is transferred to the steaming process. Output a signal to shift to.
After executing S14, S11 is executed to calculate the total load following evaporation amount JG (= 5000 (kg / h)), and the process proceeds to S12.
When S12 is executed, it is determined that the total load following evaporation amount JG (= 5000 (kg / h)) <the set load following evaporation amount (= 5000 (kg / h)) is not satisfied. To complete.
In this embodiment, when any boiler moves to the upper combustion position and completes the operation sequence N (in this embodiment, N = 1, 2,... 9), the required evaporation amount JN is S5, S6, and S7 are repeated until the total evaporation amount JR <required evaporation amount JN in S7 becomes “YES” until it corresponds to the next operation order (N + 1).
(2) Next, when the required evaporation amount JN exceeds 1000 (kg / h), the calculation unit 43 sequentially executes S5, S6, S7, S8, and S9, and steaming lower than the first boiler 21 is performed. The 1st combustion position of the 2nd boiler 22 in a transition process is made into a combustion state.
Thereafter, S10 and S11 are executed to calculate a total evaporation amount JR of 2000 (kg / h) and a total load following evaporation amount JG of 4000 (kg / h).
Next, when S12 is executed, since total load following evaporation amount JG (4000 (kg / h)) <set load following evaporation amount JT (= 5000 (kg / h)), then S13 is executed, and in S13 Since it is determined that there is a boiler at the combustion stop position (the third boiler 23, the fourth boiler 24), a signal for executing the S14 and transferring the third boiler 23 having the highest priority to the steaming transition process is issued. Output.
After executing S14, S11 is executed to calculate the total load following evaporation amount JG (= 6500 (kg / h)), and the process proceeds to S12.
When S12 is executed, it is determined that the total load following evaporation amount JG (= 6500 (kg / h)) <the set load following evaporation amount (= 5000 (kg / h)) is not satisfied, and the process proceeds to S5 and the operation sequence 2 To complete.
With the operation sequence 2 completed, the total evaporation amount JR is 2000 (kg / h), the total load following evaporation amount JG is 6500 (kg / h), and the total load following evaporation amount JG is the set load following evaporation amount JT. (= 5000 (kg / h)) is satisfied.
Thereafter, S5, S6, and S7 are repeated until the required evaporation amount JN increases until it corresponds to the next operation sequence 3, and the total evaporation amount JR <the required evaporation amount JN in S7 becomes “YES”.
(3) Next, when the required evaporation amount JN exceeds 2000 (kg / h), the calculation unit 43 executes S5, S6, S7, S8, and S9 in order, and the priority order is the highest in the first boiler group 2A. The second combustion position of the priority first boiler 21 is set to the combustion state.
Thereafter, S10 and S11 are executed, and the total evaporation amount JR is calculated as 3000 (kg / h), and the total load following evaporation amount JG is calculated as 5500 (kg / h).
Next, when S12 is executed, the total load following evaporation amount JG (5500 (kg / h)) <the set load following evaporation amount JT (= 5000 (kg / h)) is not satisfied. Complete step 3.
With the operation sequence 3 completed, the total evaporation amount JR is 2000 (kg / h), the total load following evaporation amount JG is 5500 (kg / h), and the total load following evaporation amount JG is the set load following evaporation amount JT. (= 5000 (kg / h)) is satisfied.
Thereafter, S5, S6, and S7 are repeated until the required evaporation amount JN increases until it corresponds to the next operation sequence 4 and the total evaporation amount JR <the required evaporation amount JN in S7 becomes “YES”.
(4) Next, when the required evaporation amount JN exceeds 3000 (kg / h), the calculation unit 43 executes S5, S6, S7, S8, S9 in order, and sets the second combustion position of the second boiler 22. Set to combustion.
Thereafter, S10 and S11 are executed, and the total evaporation amount JR is calculated as 4000 (kg / h), and the total load following evaporation amount JG is calculated as 4500 (kg / h).
Next, when S12 is executed, since total load following evaporation amount JG (4500 (kg / h)) <set load following evaporation amount JT (= 5000 (kg / h)), S13 is executed next, and in S13 Since it is determined that there is a boiler at the combustion stop position (fourth boiler 24), S14 is executed to output a signal for shifting the fourth boiler 24 to the steaming transition process.
After executing S14, S11 is executed to calculate the total load following evaporation amount JG (= 5500 (kg / h)), and the process proceeds to S12.
When S12 is executed, it is determined that the total load following evaporation amount JG (= 5500 (kg / h)) <the set load following evaporation amount (= 5000 (kg / h)) is not satisfied, and the process proceeds to S5 and the operation sequence 4 To complete.
With the operation sequence 4 completed, the total evaporation amount JR is 4000 (kg / h), the total load following evaporation amount JG is 5500 (kg / h), and the total load following evaporation amount JG is the set load following evaporation amount JT. (= 5000 (kg / h)) is satisfied.
Thereafter, S5, S6, and S7 are repeated until the required evaporation amount JN increases until it corresponds to the next operation order 5, and the total evaporation amount JR <the required evaporation amount JN in S7 becomes “YES”.
(5) Next, when the required evaporation amount JN exceeds 4000 (kg / h), the calculation unit 43 executes S5, S6, S7, and S8 in order, and in S8, the high-efficiency combustion position (second combustion position). ), It is determined that there is no less boiler, and the process proceeds to S15. By executing S15, a boiler that can be shifted to a higher combustion position than the second combustion position in the first boiler group 2A (first It judges that the boiler 21 and the 2nd boiler 22) exist, and transfers to S16. By performing S16, the 3rd combustion position of the 1st boiler 21 is made into a combustion state.
Thereafter, S10 and S11 are executed, and the total evaporation amount JR is calculated to be 5000 (kg / h), and the total load following evaporation amount JG is calculated to be 4500 (kg / h).
Next, when S12 is executed, since total load following evaporation amount JG (4500 (kg / h)) <set load following evaporation amount JT (= 5000 (kg / h)), S13 is executed next, and in S13 When it is determined that there is no boiler at the combustion stop position, the process proceeds to S5, and the operation sequence 5 is completed.
With the operation sequence 5 completed, the total evaporation amount JR is 5000 (kg / h), the total load following evaporation amount JG is 4500 (kg / h), and the total load following evaporation amount JG is the set load following evaporation amount JT. (= 5000 (kg / h)) is not satisfied. After the operation sequence 5, the total load following evaporation amount JG does not satisfy the set load following evaporation amount JT.
Thereafter, S5, S6, and S7 are repeated until the required evaporation amount JN increases until it corresponds to the next operation order 6 and the total evaporation amount JR <required evaporation amount JN in S7 becomes “YES”.
(6) Next, when the required evaporation amount JN exceeds 5000 (kg / h), the calculation unit 43 sequentially executes S5, S6, S7, and S8. In S8, the high-efficiency combustion position (second combustion position) ), It is determined that there is no less boiler, and the process proceeds to S15. By executing S15, a boiler that can move to a higher combustion position than the second combustion position in the first boiler group 2A (second It is determined that the boiler 22) exists, and the process proceeds to S16. By performing S16, the 3rd combustion position of the 2nd boiler 22 is made into a combustion state.
Thereafter, S10 and S11 are executed to calculate the total evaporation amount JR of 6000 (kg / h) and the total load following evaporation amount JG of 3500 (kg / h).
Next, when S12 is executed, since total load following evaporation amount JG (3500 (kg / h)) <set load following evaporation amount JT (= 5000 (kg / h)), S13 is then executed, and in S13 When it is determined that there is no boiler at the combustion stop position, the process proceeds to S5, and the operation sequence 6 is completed.
With the operation sequence 6 completed, the total evaporation amount JR is 6000 (kg / h), the total load following evaporation amount JG is 3500 (kg / h), and the total load following evaporation amount JG is the set load following evaporation amount JT. (= 5000 (kg / h)) is not satisfied.
Thereafter, S5, S6, and S7 are repeated until the required evaporation amount JN increases until it corresponds to the next operation sequence 7, and the total evaporation amount JR <the required evaporation amount JN in S7 becomes “YES”.
(7) Next, when the required evaporation amount JN exceeds 6000 (kg / h), S5, S6, S7, S8, S15, and S17 are sequentially executed. In S17, the second boiler group 2B is placed at the upper combustion position. It is determined that there are boilers (third boiler 23, fourth boiler 24) that can be shifted to the above, and the process proceeds to S18 and executes S18, so that the third boiler 23 and the fourth boiler 24 are in the combustion position. It judges that it is not in combustion, transfers to S19, and makes the 1st combustion position of the 3rd boiler 23 into a combustion state by performing S19.
Thereafter, S10 and S11 are executed, and the total evaporation amount JR is calculated to be 7000 (kg / h), and the total load following evaporation amount JG is calculated to be 2500 (kg / h).
Next, when S12 is executed, since total load following evaporation amount JG (2500 (kg / h)) <set load following evaporation amount JT (= 5000 (kg / h)), then S13 is executed, and in S13 When it is determined that there is no boiler at the combustion stop position, the process proceeds to S5, and the operation sequence 7 is completed.
With the operation sequence 7 completed, the total evaporation amount JR is 7000 (kg / h), the total load following evaporation amount JG is 2500 (kg / h), and the total load following evaporation amount JG is the set load following evaporation amount JT. (= 5000 (kg / h)) is not satisfied.
Thereafter, S5, S6, and S7 are repeated until the required evaporation amount JN increases until it corresponds to the next operation order 8, and the total evaporation amount JR <the required evaporation amount JN in S7 becomes “YES”.
(8) Next, when the required evaporation amount JN exceeds 7000 (kg / h), S5, S6, S7, S8, S15, and S17 are executed in order. In S17, the second boiler group 2B is in the upper combustion position. When it is determined that there is a boiler (third boiler 23, fourth boiler 24) that can be transferred to, and the process proceeds to S18 and executes S18, the third boiler 23 is in combustion at the combustion position. It judges, transfers to S20, and makes the 2nd combustion position of the 3rd boiler 23 into a combustion state by performing S20.
Thereafter, S10 and S11 are executed, and the total evaporation amount JR is calculated as 8500 (kg / h), and the total load following evaporation amount JG is calculated as 1000 (kg / h).
Next, when S12 is executed, since total load following evaporation amount JG (1000 (kg / h)) <set load following evaporation amount JT (= 5000 (kg / h)), then S13 is executed, and in S13 When it is determined that there is no boiler at the combustion stop position, the process proceeds to S5, and the operation sequence 8 is completed.
With the operation sequence 8 completed, the total evaporation amount JR is 8000 (kg / h), the total load following evaporation amount JG is 1000 (kg / h), and the total load following evaporation amount JG is the set load following evaporation amount JT. (= 5000 (kg / h)) is not satisfied.
Thereafter, S5, S6, and S7 are repeated until the required evaporation amount JN increases until it corresponds to the next operation order 9 and the total evaporation amount JR <the required evaporation amount JN in S7 becomes “YES”.
(9) Next, when the required evaporation amount JN exceeds 8500 (kg / h), S5, S6, S7, S8, S15, and S17 are executed in order. In S17, the second boiler group 2B has a higher combustion position. It is determined that there is a boiler (fourth boiler 24) that can be transferred to, and the process proceeds to S18. By executing S18, it is determined that the fourth boiler 24 is not in the combustion position and the process proceeds to S19. Then, the first combustion position of the fourth boiler 24 is set to the combustion state by executing S19.
Thereafter, S10 and S11 are executed to calculate the total evaporation amount JR as 9500 (kg / h) and the total load following evaporation amount JG as zero (kg / h).
Next, when S12 is executed, since total load following evaporation amount JG (zero (kg / h)) <set load following evaporation amount JT (= 5000 (kg / h)), then S13 is executed, and in S13 When it is determined that there is no boiler at the combustion stop position, the process proceeds to S5, and the operation sequence 9 is completed.
With the operation sequence 9 completed, the total evaporation amount JR is 9500 (kg / h), the total load following evaporation amount JG is zero (kg / h), and the total load following evaporation amount JG is the set load following evaporation amount JT. (= 5000 (kg / h)) is not satisfied.

As described above, the total evaporation amount JR increases in the operation order shown in FIG.
Further, the total evaporation amount JR and the total load following evaporation amount JG in a state where the respective operation orders (1 to 9) are completed are as shown in FIG. 5 as described above.

  After the operation sequence 4 is completed, the total load following evaporation JG cannot be increased because the third boiler 23 and the fourth boiler 24 belonging to the second boiler group 2B are already in the steaming transition process. After the operation sequence 5 is completed, since the first boiler 21 and the second boiler 22 move to the third combustion position higher than the high efficiency combustion position, the total load following evaporation amount JG becomes equal to the set load following evaporation amount JT. I'm not satisfied.

  According to the boiler system 1, it is possible to easily and efficiently ensure a load following evaporation amount JG equal to or greater than the second evaporation amount JS2 (set load following evaporation amount JT) corresponding to the fluctuation range of the required load. As a result, it is possible to improve the load followability with respect to the fluctuation of the required load that normally occurs.

Further, according to the boiler system 1, the first boiler 21 and the second boiler 22 of the first boiler group 2A move to the third combustion position higher than the high efficiency combustion position, and the total load following evaporation amount JG is set. Even if the load following evaporation amount JT is not satisfied, since the third boiler 23 and the fourth boiler 24 belonging to the second boiler group 2B are in the steaming transition process, the evaporation amount corresponding to the maximum evaporation amount JM of the required load Even if there is a sudden variation within the range, the amount of evaporation corresponding to the variation can be reliably steamed in a short time.
As a result, the load followability of the boiler group 2 can be improved, and as a result, generation of time lag and hunting in the boiler group 2 can be suppressed.

  Further, according to the boiler system 1, the amount of evaporation that increases when the combustion position shifts to the combustion position of the highest combustion position that is the operation target, and the boiler that is in the steaming transition process among the boilers 21,. Since the total load following evaporation amount JG is calculated by adding the evaporation amount that increases when shifting to the combustion position of the uppermost combustion position that is the target of operation, the process shifts to the boiler to be steamed and the steaming transition process The number of boilers can be reduced, and excess energy consumption can be suppressed.

Next, a second embodiment of the present invention will be described with reference to FIGS.
FIG. 6 is a diagram showing a boiler system 1A according to the second embodiment. The second embodiment is different from the first embodiment in that the boiler system 1A is a first boiler 21,. Instead of the four boiler groups 2 of the fourth boiler 24, a boiler group 3 consisting of five boilers is provided.

  In contrast, the boiler group 2 is controlled in accordance with preset priorities, whereas in the boiler group 3, the boiler and the combustion position (combustion stop position) correspond to the total evaporation amount JR and the total load following evaporation amount JG. , Steaming transition process) is selected. Since others are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

  As shown in FIG. 6, the boiler system 1A includes, for example, a first boiler 31, a second boiler 32, a third boiler 33, a fourth boiler 34, and a fifth boiler 35. In this embodiment, The 1st boiler 31, the 2nd boiler 32, the 3rd boiler 33, and the 4th boiler 34 (the 5th boiler 35 is the same composition as the 4th boiler 34) are made into the composition from which each combustion position and difference evaporation differed. Yes.

  Further, the boiler group 3 is controlled by the control unit 4 so that the first boiler group 3 </ b> A including the first boiler 31, the second boiler 32, and the third boiler 33, and the second boiler group including the fourth boiler 34 and the fifth boiler 35. It shall be classified into 3B.

FIG. 7 is a diagram conceptually showing the first boiler 31, the second boiler 32, the third boiler 33, the fourth boiler 34, and the fifth boiler 35 that constitute the boiler group 3, and each frame is the first boiler 31. The frames representing the second boiler 32, the third boiler 33, the fourth boiler 34, and the fifth boiler 35 by partitioning the boilers 31,..., The fifth boiler 35 indicate the respective combustion positions.
The number in each frame indicating the combustion position indicates the differential evaporation amount at each combustion position, the number indicated by <> indicates the rated evaporation amount, and (preliminary) indicates that the combustion position is a spare can (not subject to operation) The combustion position of

  For example, the first evaporation amount JS1 of the boiler group 3 is 4400 (kg / h), the second evaporation amount is 6100 (kg / h), and the maximum evaporation amount JM of the required load is 10500 (kg / h). Yes.

  The first boiler 31 has a first differential evaporation amount of 500 (kg / h), a second differential evaporation amount of 1000 (kg / h), a third differential evaporation amount of 2000 (kg / h), and a rated evaporation amount of 3500. (Kg / h) is a four-position boiler, the first combustion position and the second combustion position correspond to the first evaporation amount JS1, and the second combustion position is the high-efficiency combustion position.

  The second boiler 32 has a first differential evaporation amount of 1000 (kg / h), a second differential evaporation amount of 1500 (kg / h), a third differential evaporation amount of 1500 (kg / h), and a rated evaporation amount of 4000. (Kg / h) is a four-position boiler, the first combustion position and the second combustion position correspond to the first evaporation amount JS1, and the second combustion position is the high-efficiency combustion position.

  The third boiler 33 is a three-position boiler having a first differential evaporation amount of 500 (kg / h), a second differential evaporation amount of 1500 (kg / h), and a rated evaporation amount of 2000 (kg / h). One combustion position corresponds to the first evaporation amount JS1, and the first combustion position is a high efficiency combustion position.

  The fourth boiler 34 and the fifth boiler 35 have a first differential evaporation amount of 1000 (kg / h), a second differential evaporation amount of 1500 (kg / h), and a rated evaporation amount of 2500 (kg / h) in three positions. It is considered as a boiler, and the first combustion position is a high efficiency combustion position.

In the boiler group 3, the total difference evaporation amount at the combustion position corresponding to the first evaporation amount JS1 is 4500 (kg / h) (> 4400 (kg / h)), and the difference between the combustion positions corresponding to the second evaporation amount JS2 The total evaporation amount is 7000 (kg / h) (> 6100 (kg / h)), and the maximum evaporation amount of the boiler group 3 is 11500 (kg / h) (> 10500 (kg / h)).
Moreover, the boiler group 3 shall set the 3rd combustion position of the 2nd boiler 32, and the 2nd combustion position of the 3rd boiler 33 to the preliminary | backup can at the time of an operation start.

  Moreover, when each boiler 31, ..., 35 is in the steaming transition process, it shifts to the first combustion position in a short time to enable steaming, transitions to the steaming transition process, and the total load following evaporation By ensuring the amount, the load followability can be improved. The definition of the steaming transition process is the same as in the first embodiment.

  In the second embodiment, for example, the evaporation amount that is steamed for the longest time in the boiler group 3 is the first evaporation amount JS1, and the first evaporation amount JS1 includes the first combustion position and the second combustion position of the first boiler 31. The combustion position, the first combustion position of the second boiler 32, the second combustion position, and the first combustion position of the third boiler 33 are assigned.

Further, as the second evaporation amount JS2 that is the fluctuation range of the evaporation amount that fluctuates beyond the first evaporation amount JS1, the third combustion position of the first boiler 31, the first combustion position and the second combustion position of the fourth boiler 35 are illustrated. The first combustion position and the second combustion position of the fifth boiler 35 are assigned. (Since the third combustion position of the second boiler 32 and the second combustion position of the third boiler 33 are spare cans, they are excluded from the target of the second evaporation amount JS2.)
Moreover, the point which sets 2nd evaporation amount JS2 as setting load follow-up evaporation amount JT is the same as that of 1st Embodiment.

The database 45 includes a first database 45A, a second database 45B, and a third database 45C. The first database 45A and the second database 45B are the same as those in the first embodiment. The same is said.
For example, as shown in FIG. 8, the third database 45 </ b> C is supplied with the differential evaporation amount Ji (j) at each combustion position of each boiler 31,..., 35 and each boiler 31,. Numerical data indicating the total load following evaporation amount GiA (j), GiB (j), GiC (j) in the steam transfer process and each combustion position is stored in the form of a data table.

Here, i (= 31, 32, 33, 34, 35) in FIG. 8 indicates a code for specifying the boiler, and j (= 0, 1, 2, 3) indicates a code for specifying the combustion position. In addition, j = 0 indicates that the pressure keeping state is set in the steaming transition process (any one of the first state to the third state is set), and Gi (0) is the pressure keeping state in the steaming transition process. It means the total load following evaporation amount in the state.
Further, the total load following evaporation amount GiA (j), the total load following evaporation amount GiB (j), and the total load following evaporation amount GiC (j) are the same as those in the first embodiment, and in the second embodiment, The total load following evaporation amount JG is calculated, for example, by adding the total load following evaporation amount GiC (j).

  The computing unit 43 refers to the third database 45C to ensure the total evaporation amount JR and the total load following evaporation amount JG that satisfy the required evaporation amount JN, the set load following evaporation amount JT, and the excessive total evaporation amount JR. In order to suppress the generation of the total load following evaporation amount JG, the boiler and the combustion position are selected (calculated) so as to reduce the total evaporation amount JR and the total load following evaporation amount JG.

  In addition, when changing the setting of the spare can, the calculation unit 43 selects the boiler and the combustion position as the spare can so that the maximum evaporation amount of the boiler group 3 is equal to or greater than the maximum evaporation amount JM of the required load. It is supposed to be. In this embodiment, the calculating part 43 shall set the 3rd combustion position of the 2nd boiler 32, and the 2nd combustion position of the 3rd boiler 33 to a spare can.

Hereinafter, with reference to FIG. 9 and FIG. 10, an outline of a program for increasing the evaporation amount at the combustion position corresponding to the first evaporation amount JS1 of the first boiler group 3A according to the second embodiment will be described. To do. 9 and 10, the total evaporation amount JR, the total load following evaporation amount JG, and the set load following evaporation amount JT corresponding to the second evaporation amount JS2 will be described.
The program according to the second embodiment has the following four functions as shown in the block diagram of FIG.
(1) First, a combination of combustion positions capable of sequentially shifting from the combustion position currently being burned is generated (S101).
In S101, when generating a combination of combustion positions, the boiler belonging to the first boiler group 3A is prioritized, and the combustion position corresponding to the first evaporation amount JS1 is the combustion position of the boiler belonging to the first boiler group 3A. The combustion position corresponding to the second evaporation amount JS2 is prioritized.
(2) Next, a combination of combustion positions in which the total load following evaporation amount JG has a predetermined relationship with the set load following evaporation amount JT is extracted (S102).
In S102, when calculating whether the total load following evaporation amount JG has a predetermined relationship with the set load following evaporation amount JT, the boilers at the combustion stop positions in the first boiler group 3A and the second boiler group 3B When the set load following evaporation amount JT is ensured by shifting to the steaming transition process, it is set as an extraction target.
The total load following evaporation amount JG has a predetermined relationship with the set load following evaporation amount JT. For example, the total load following evaporation amount JG is equal to or greater than the set load following evaporation amount JT and within a predetermined setting range. In the second embodiment, it means that the total load following evaporation amount JG is equal to or greater than the set load following evaporation amount JT.
(3) A combination of combustion positions that satisfies the total evaporation amount JR ≧ required evaporation amount JN and minimizes the total evaporation amount JR is selected (S103).
(4) Out of the selected combinations of combustion positions, combustion start signals are sequentially output to combustion positions that are not currently burning (S104).

FIG. 10 illustrates an example of a program flow according to the second embodiment. FIG. 10 is a diagram showing an outline of a flow diagram according to the block diagram of FIG.
(1) First, a combination group of combustion positions that can be combined by sequentially shifting from the current combustion position of the boiler group 3 is generated (S201).
(2) It is determined whether there is a combination group of combustion positions to be verified (S202).
When there is a combination group of the combustion positions to be verified, the process proceeds to S203, and when there is no combination group of the combustion positions to be verified, the program ends.
(3) The computing unit 43 appropriately selects a combination of combustion positions from a combination group of combustion positions to be verified (S203).
(4) The computing unit 43 compares the total load following evaporation amount JG based on the combination of the combustion positions selected in S203 with the set load following evaporation amount JT, and the total load following evaporation amount JG ≧ the set load following evaporation amount JT. Is determined (S204). If the total load following evaporation amount JG ≧ the set load following evaporation amount JT, the process proceeds to S205. If the total load following evaporation amount JG ≧ the set load following evaporation amount JT, the process proceeds to S202 and the verified combustion position is determined. Discard the combination.
(5) The computing unit 43 compares the total evaporation amount JR based on the combination of the combustion positions verified in S204 with the required evaporation amount JN, and determines whether or not the total evaporation amount JR ≧ the required evaporation amount JN. S205). If the total evaporation amount JR ≧ the required evaporation amount JN, the combustion position combination is stored in the memory 42, and the process proceeds to S206. If the total load following evaporation amount JG ≧ the set load following evaporation amount JT, the process proceeds to S202. At the same time, the verified combination of combustion positions is discarded.
(6) In S205, the calculation unit 43 compares the combination of the combustion positions satisfying the total evaporation amount JR ≧ the required evaporation amount JN with the total evaporation amount JR of the combination of combustion positions already stored in the memory 42, and this time It is determined whether or not the total evaporation amount JR of the combustion position combination <the total evaporation amount JR of the stored combustion position combination (S206).
If the total evaporation amount JR of the combination of the current combustion position is less than the total evaporation amount JR of the combination of the stored combustion position, the process proceeds to S207 and the total evaporation amount JR of the combination of the current combustion position is stored. If it is not the total evaporation amount JR of the combination of combustion positions, the process proceeds to S202, and the combination of the current combustion positions is discarded.
(7) The computing unit 43 stores the current combustion position combination in the memory 42 and replaces the already stored combustion position combination (S207).
The above (2) to (7) are repeatedly executed.

  Next, the operation of the boiler system 1A will be described with reference to FIGS. FIG. 11 shows the boiler group 3, and FIG. 12 shows the first boiler group 3A. In this embodiment, the combustion positions of the boilers belonging to the first boiler group 3A are given higher ranks in order to simplify the explanation. It is assumed that the required evaporation amount JN can be secured by shifting, and if the set load following evaporation amount JT is not secured by the first boiler group 3A, the second boiler group 3B is steamed as necessary. Transition to the transition process.

FIG. 11 is a table showing the types (No.) of combinations of combustion positions that can be configured by sequentially shifting from the combustion state of the boiler in FIG. 12 (A). , 35 show the states of the respective combustion positions.
The combustion position described as in-combustion indicates that the combustion position already burned in FIG. 12 (A) is indicated as “preliminary can” and is not subject to operation. In order to secure the amount JR and the total load following evaporation amount JG, it is shown that new combustion is performed. Moreover, (triangle | delta) displayed on the column of the 4th boiler 34 and the 5th boiler 35 has shown that it exists in the steaming transfer process.

In FIG. 12, the frames in the frames representing the first boiler 31, the second boiler 32, and the third boiler 33 indicate the combustion position, and the (preliminary) described in the frame representing the combustion position is out of the operation target. A preliminary can (combustion position) is shown.
The hatched combustion position indicates the combustion position during steaming that is the target of calculation of the total evaporation amount JR, and the combustion position that is only shaded indicates the combustion position of the total load following evaporation amount JG. ing.

  Further, the boiler system 1A ensures the total evaporation amount JR and the total load following evaporation amount JG that satisfy the required evaporation amount JN, the set load following evaporation amount JT when the evaporation amount increases, and the same when reducing the evaporation amount. Judgment is made.

Moreover, as shown in FIG. 12 (A), the boiler group 3 assumes that the 1st combustion position of the 1st boiler 31 and the 1st combustion position of the 3rd boiler 33 are already in a combustion state.
In FIG. 12A, the required evaporation amount JN of the boiler group 3 is 1000 (kg / h). In FIG. 12B, the required evaporation amount JN of the boiler group 3 is 2000 (kg / h), that is, necessary. It is assumed that the evaporation amount JN is increased by 1000 (kg / h). The set load follow-up evaporation JT is 6100 (kg / h).

  Moreover, the 3rd boiler 33 and the 4th boiler 34 which belong to the 2nd boiler group 3B shall transfer to a steaming transfer process suitably as needed, and the required evaporation amount JN is contained in the combination of the produced | generated combustion position. If there is one that satisfies both the set load following evaporation amount JT, the third boiler 33 and the fourth boiler 34 do not shift to the steaming transition process, and select a combination of combustion positions from those that satisfy both of the above. It shall be.

Here, in the first boiler group 3A shown in FIG. 12A, the second combustion position of the first boiler 31 corresponding to the first evaporation amount JS1 and not combusting, and the first boiler 32 The sum of the differential evaporation amounts at the combustion position and the second combustion position is 3500 (kg / h) (> 1000 (kg / h) increase in required different evaporation JN). Therefore, only the second combustion position of the first boiler 31, the first combustion position, and the second combustion position of the second boiler 32 corresponding to the first evaporation amount JS1 are extracted. That is, the third combustion position of the first boiler 31 is excluded from the target when generating a combination of combustion positions.
For simplicity, the maximum evaporation amount JM of the required load is omitted.

(1) First, a combination of combustion positions capable of sequentially shifting from the combustion position currently being burned is generated (S101).
By executing S101,
1) Combustion position combination; 31 (1) +33 (1) +31 (2)
In this combination of combustion positions, combustion of 31 (2) is newly started,
Total evaporation JR = 2000 (kg / h)
Total load following evaporation JG = 7000 (kg / h)
It is. The total load following evaporation amount JG (= 7000 (kg / h)) assumes that the fourth boiler 34 and the fifth boiler 35 are transferred to the steaming transfer process.
Similarly,
2) Combustion position combination; 31 (1) +33 (1) +32 (1)
With this combination of combustion positions, 32 (1) combustion is newly started,
Total evaporation JR = 2000 (kg / h)
Total load following evaporation JG = 7000 (kg / h)
It is. The total load following evaporation amount JG (= 7000 (kg / h)) assumes that the fourth boiler 34 is shifted to the steaming transition process.
3) Combustion position combination; 31 (1) +33 (1) +31 (2) +32 (1)
In this combination of combustion positions, combustion of 31 (2) +32 (1) is newly started,
Total evaporation JR = 3000 (kg / h)
Total load following evaporation JG = 8500 (kg / h)
It is. The total load following evaporation amount JG (= 8500 (kg / h)) assumes that the fourth boiler 34 and the fifth boiler 35 are transferred to the steaming transfer process.
4) Combustion position combination; 31 (1) +33 (1) +32 (1) +32 (2)
With this combination of combustion positions, 32 (1) +32 (2) combustion is newly started,
Total evaporation JR = 3500 (kg / h)
Total load following evaporation JG = 8000 (kg / h)
It is. The total load following evaporation amount JG (= 8000 (kg / h)) assumes that the fourth boiler 34 and the fifth boiler 35 are transferred to the steaming transfer process.
5) Combustion position combination; 31 (1) +33 (1) +31 (2) +32 (1) +32 (2)
In this combination of combustion positions, combustion of 31 (2) +32 (1) +32 (2) is newly started,
Total evaporation JR = 4500 (kg / h)
Total load following evaporation JG = 7000 (kg / h)
It is. The total load following evaporation amount JG (= 7000 (kg / h)) assumes that the fourth boiler 34 and the fifth boiler 35 are transferred to the steaming transfer process.
The combination of combustion positions 1) to 5) is generated as a target of the combination group of combustion positions in S201.
(2) Next, when S102 is executed and a combination of combustion positions satisfying the total load following evaporation amount JG ≧ the set load following evaporation amount JT (= 6100 (kg / h)) is extracted, the above 1) to 5) ) Are extracted.
(3) Next, when S103 is executed to select a combination of combustion positions that satisfies the total evaporation amount JR ≧ required evaporation amount JN and minimizes the total evaporation amount JR, the required evaporation amount JN = 2000 (kg / h Therefore, 1) and 2), which are the minimum when the total evaporation amount JR is 2000 (kg / h) or more, are candidates. In this embodiment, for example, 2) is selected because the number of boilers in the steaming transition process is small.
(4) Execute S104 and output a signal to start combustion at the combustion position 32 (1).
As a result, the combination of combustion positions consisting of 31 (1) +32 (1) +33 (1) burns. When a signal is required to shift the fourth boiler 34 to the steaming transition process, or to release the fifth boiler 35 from the steaming transition process, a signal is output as appropriate.

According to the boiler system 1A, a combination of combustion positions (the selected boiler and combustion) in which the total load following evaporation amount JG secures the set load following evaporation amount JT by sequentially shifting from the combination of the currently burning combustion positions. Position) and the combination of the combustion positions where the total evaporation amount JR is minimized is selected from among them, so that the boiler and the combustion position where the total evaporation amount JR is minimized can be easily obtained while ensuring the total load following evaporation amount JG. And can be selected efficiently.
As a result, excess energy consumption can be suppressed while ensuring the load followability of the boiler group 3.

Next, a third embodiment of the present invention will be described with reference to FIG.
FIG. 13 (A) is a diagram conceptually showing the boilers 21,..., 24 constituting the boiler group 2, and shows the operation order of the combustion positions in parentheses. ) Is a diagram showing the evaporation amount of each boiler 21, ..., 24, the load following evaporation amount, the total evaporation amount JR of the boiler group 2, and the total load following evaporation amount JG corresponding to the operation sequence at that time. It is. The shaded portion shown in FIG. 13B indicates that the boilers 21,..., 24 are in the steaming transition process.

  The third embodiment differs from the first embodiment in that, in the first embodiment, when the evaporation amount is increased in response to the increase in the required evaporation amount JN, the control unit 4 has the first boiler. The first and second boilers 21 and 22 belonging to the first boiler group 2A are brought close to each other until the second combustion position (high efficiency combustion position) of the first boiler 21 and the second boiler 22 is in a combustion state, and sequentially. While the combustion positions of the first boiler 21 and the second boiler 22 are selected according to the priority order, in the third embodiment, after the boilers reach the second combustion position, the priority positions are sequentially set according to the priority order. The point is that the next boiler is moved to the first combustion position. Others are the same as those in the first embodiment, and a description thereof is omitted. The first evaporation amount JS1 (= 3800 (kg / h)) and the set load following evaporation amount JT (= 5000 (kg / h)) are the same as those in the first embodiment.

  According to the boiler system 1 according to the third embodiment, the number of boilers to be burned can be reduced, and the number of boilers to be burned at the high efficiency combustion position per total evaporation amount JR can be increased, thereby saving energy. be able to.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
FIG. 14 (A) is a diagram conceptually showing the boilers 21,..., 24 constituting the boiler group 2, and shows the operation sequence of each combustion position in parentheses. ) Is a diagram showing the evaporation amount of each boiler 21, ..., 24, the load following evaporation amount, the total evaporation amount JR of the boiler group 2, and the total load following evaporation amount JG corresponding to the operation sequence at that time. It is. The shaded portion shown in FIG. 14 (B) indicates that the boilers 21,..., 24 are in the steaming transition process.

  The fourth embodiment differs from the first embodiment in that, in the first embodiment, when the evaporation amount is increased in response to the increase in the required evaporation amount JN, the control unit 4 shifts to the steam supply. The boilers to be shifted to the process are sequentially selected according to the priority order, whereas in the fourth embodiment, the priority order is sequentially increased from the third boiler 23 and the fourth boiler 24 belonging to the second boiler group 2B. Therefore, it is a point to select. Others are the same as those in the first embodiment, and a description thereof is omitted. The first evaporation amount JS1 (= 3800 (kg / h)) and the set load following evaporation amount JT (= 5000 (kg / h)) are the same as those in the first embodiment.

  According to the boiler system 1 according to the fourth embodiment, the required evaporation amount JN increases in the first boiler group 2A until the required evaporation amount JN reaches the evaporation amount corresponding to the first boiler group 2A. Even if the load following evaporation amount decreases, the load following evaporation amount related to the third boiler 4 and the fourth boiler 24 belonging to the second boiler group 2B can be reliably ensured. Can be stabilized.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
FIG. 15A conceptually shows the boilers 21,..., 24 constituting the boiler group 2, and shows the operation order of the combustion positions in parentheses. ) Is a diagram showing the evaporation amount of each boiler 21, ..., 24, the load following evaporation amount, the total evaporation amount JR of the boiler group 2, and the total load following evaporation amount JG corresponding to the operation sequence at that time. It is. The shaded portion shown in FIG. 15 (B) indicates that the boilers 21,..., 24 are in the steaming transition process.

  The fifth embodiment differs from the first embodiment in that, in the first embodiment, the first boiler group 2A is composed of the first boiler 21 and the second boiler 22, and the second boiler group 2B is In the fifth embodiment, the first boiler group 2 </ b> A includes the first boiler 21, the second boiler 22, and the third boiler 23, whereas the third boiler 23 and the fourth boiler 24 are configured. The second boiler group 2B is composed of the fourth boiler 24, and the combustion position corresponding to the first evaporation amount JS1 is from the first combustion position of the first boiler 21 and the first combustion position of the second boiler 22. The third combustion position, the first combustion position of the third boiler 23, and the second combustion position, the high efficiency combustion position is the first combustion position of the first boiler 21, the third combustion position of the second boiler 22, and the third The second combustion position of the boiler 23 is the point.

In the fifth embodiment, the first boiler 21, the second boiler 22, and the third boiler 23 belonging to the first boiler group 2A reach the high-efficiency combustion position while securing the set load following evaporation amount JT. After that, the boilers with the next priority are sequentially started to burn.
Moreover, after all the 1st boiler 21, the 2nd boiler 22, and the 3rd boiler 23 arrived at the high efficiency combustion position, it transfers to a higher combustion position according to a priority, and the 1st boiler 21, the 2nd boiler 22, the 2nd After all the three boilers 23 have reached the uppermost combustion position, the fourth boiler 24 of the second boiler group 2B starts to burn. Others are the same as those in the first embodiment, and a description thereof will be omitted. The first evaporation amount JS1 (= 3800 (kg / h)) and the set load following evaporation amount JT (= 5000 (kg / h)) are the same as those in the first embodiment.

  According to the boiler system 1 according to the fifth embodiment, even when the high-efficiency combustion positions of the boilers 21,..., 24 are different, the number of boilers to be burned is reduced and the high efficiency per total evaporation amount JR is high. Since the number of boilers that burn at the combustion position can be increased, energy can be saved.

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 above-described embodiment, the boiler group 2 constituting the boiler system 1 is constituted by two four-position boilers and two three-position boilers, or four four-position boilers, and constitutes the boiler system 1A. However, the number of boilers forming the boiler groups 2 and 3 and the configuration of each boiler (e.g., the number of combustion positions, differential evaporation of each combustion position) are described. The amount etc.) can be set arbitrarily.

  Moreover, in the said embodiment, in the boiler group 2, for example, the 2nd combustion position of the 1st boiler 21 and the 2nd boiler 22 corresponding to the 1st evaporation JS1, the 3rd boiler 23, and the 4th boiler 24 Although the case where the first combustion position is the high-efficiency combustion position has been described, which combustion position is set as the high-efficiency combustion position can be arbitrarily set. For example, the second embodiment and the fifth embodiment As shown in the embodiment, a combustion position at a different stage of each boiler may be set as a high efficiency combustion position. Needless to say, it is not always necessary to set a high-efficiency combustion position for the boiler corresponding to the second evaporation amount JS2.

  Further, instead of the total evaporation amount JR by the combination of the combustion position that burns for a long time and the corresponding combustion position, for example, the steam use amount is calculated from the pressure or the like, or the steam use amount is obtained by measuring with a steam flow meter or the like. An average value or the like of the total evaporation amount JR in a predetermined time may be obtained and used as the first evaporation amount JS1 in the boiler systems 1 and 1A.

  In the above-described embodiment, the case where the highest combustion position among the combustion positions corresponding to the first evaporation amount JS1 in each boiler is the high-efficiency combustion position has been described. Thus, the combustion position with the best load followability may be made to correspond to the first evaporation amount JS1 of each boiler to improve the load followability of the boiler group.

Further, in the above embodiment, when calculating the total load following evaporation amount JG, the evaporation amount that increases when the combustion boiler moves to the highest combustion position and the boiler in the steaming transfer process are the highest. I explained the case where the amount of evaporation that increases when moving to the upper combustion position is targeted,
In the above embodiment, in calculating the total load following evaporation amount JG,
1) The amount of evaporation that increases when the combustion boiler is moved to the highest combustion position that is the target of operation of the boiler, and the highest level that is the target of operation of the boiler that is in the steaming transition process The total amount of evaporation that increases when the combustion position is shifted to 2) The amount of evaporation that increases when the combustion boiler shifts to the highest combustion position of the boiler 3) The highest combustion position of the boiler that is burning Whether to calculate for the total amount of evaporation that increases when the boiler shifts to the lowermost combustion position of the boiler and the amount of evaporation that increases when the boiler shifts to Can be set.

In calculating the total load following evaporation amount JG,
Boiler during combustion, instead of the amount of evaporation that increases when the boiler in the steaming transition process is shifted to the highest combustion position that is the operation target of the boiler, for example,
1) The combustion position during combustion is shifted to the combustion position one level higher that is the target of operation 2) The combustion position that is set as the target of operation higher by the plurality of stages set in advance 3) The transition to the high efficiency combustion position is performed It is good also as a structure which calculates for the evaporation amount which increases when it assumes that any one was performed.
Further, not only the combustion position that is the operation target but also the combustion position that is not the operation target may be included in the calculation target.

  Moreover, in the said embodiment, although the part of the boiler (combustion position) which comprises the boiler groups 2 and 3 was demonstrated as a spare can by failure, repair, planned stop, etc., a spare can is demonstrated. It is good also as a structure which does not have, and is good also as a structure which changes a setting of a preliminary | backup can.

  Further, in the above embodiment, when any one of the boilers is shifted to a higher combustion position and the set load following evaporation amount JT cannot be secured, the boiler having the highest priority in the boiler group 2 is subjected to the steaming transition process. (I.e., transition to the steaming transition process in the order of the first boiler group 2A and the second boiler group 2B), and the case where the set load following evaporation amount JT is ensured has been described. For example, the fourth embodiment As such, the second boiler group 2B may be transferred to the steaming transfer process in preference to the first boiler group 2A.

In the first embodiment, the case where the maximum evaporation amount JM of the required load is equal to the first evaporation amount JS1 + the second evaporation amount JS2 (S2) has been described. For example, the total evaporation amount for the first evaporation amount JS1 is described. When it is appropriate to use the maximum value of the total evaporation amount JR for the second evaporation amount JS2 as the average value of the amount JR, for example, the maximum evaporation amount JM of the required load <the first evaporation amount JS1 + the second evaporation amount JS2 may be set, and the relative relationship between the first evaporation amount JS1, the second evaporation amount JS2, and the maximum evaporation amount JM of the required load can be arbitrarily set.
In addition, any one of the first evaporation amount JS1, the second evaporation amount JS2, and the maximum evaporation amount JM of the required load is set as a set value, and which is set by calculation can be arbitrarily determined.

In the above embodiment, the case where the first evaporation amount JS1 and the second evaporation amount JS2 are set manually has been described. However, whether these settings are automatically or manually performed is arbitrary.
Although the case where the first evaporation amount JS1 and the second evaporation amount JS2 are totaled to calculate the maximum evaporation amount JM of the required load has been described, the maximum evaporation amount JM of the required load may be set manually, It may also be obtained by referring to a database or the like.
The first evaporation amount JS1, the second evaporation amount JS2, and the maximum evaporation amount JM of the required load may all be set manually.

  In the above embodiment, in the boiler groups 2 and 3, the combustion position corresponding to the first evaporation amount JS1 and the combustion position corresponding to the second evaporation amount JS2 are both the first evaporation amount JS1 and the second evaporation amount. Although the case where the combustion position is assigned so as to be equal to or greater than the evaporation amount JS2 (= the set load following evaporation amount JT) has been described, for example, the first evaporation amount JS1 and / or the second evaporation amount JS2 Within the range in which the upper limit value and the lower limit value are set for the amount JS1 and the second evaporation amount JS2, or more than the set value offset with respect to the first evaporation amount JS1 and the second evaporation amount JS2, A combustion position may be assigned by providing a lower limit value and an upper limit value.

  In the above embodiment, the case where the first evaporation amount JS1 and the second evaporation amount JS2 are input and set has been described. For example, when the maximum evaporation amount JM of the required load is known, the maximum required load is determined. It may be configured to calculate as follows: evaporation amount JM−first evaporation amount JS1 = second evaporation amount (unknown number), or maximum evaporation amount JM−second evaporation amount JS2 = first evaporation amount (unknown number) of the required load.

  Further, any one of the first evaporation amount JS1, the second evaporation amount JS2, the maximum evaporation amount JM, or a numerical value that can specify these values is specified. For example, the first evaporation amount JS1 May change the setting of the combustion position corresponding to the first evaporation amount JS1.

In addition, as described above, for example, when the first evaporation amount JS1, the second evaporation amount JS2, and the like vary due to operation factors such as factories and seasonal factors, the first boiler groups 2A, 3A, and You may comprise so that the structure of 2 boiler groups 2B and 3B may be changed automatically.
In addition, the boilers belonging to the first boiler groups 2A and 3A and the second boiler groups 2B and 3B may be replaced at a predetermined timing.

Further, when the combustion position corresponding to the first evaporation amount JS1 no longer coincides with the high efficiency combustion position, the burner characteristics and the like are manually changed, and the combustion position corresponding to the high efficiency combustion position and the first evaporation amount JS1. The energy may be reduced in accordance with.
In the above case, the high efficiency combustion position may be automatically switched.

  In the above embodiment, the case where the evaporation amount is controlled using the steam pressure P (t) and the target pressure PT in the steam header 6 as the physical quantity corresponding to the steam amount has been described. The evaporation amount may be controlled by using the evaporation amount or other physical quantity corresponding to the evaporation amount, such as the amount of steam used in the steam use facility 18.

In addition, although an example of the schematic configuration of the program according to the present invention has been shown as a flow diagram and a block diagram, the program may be configured using a method (algorithm) other than the above flowchart or block diagram.
For example, in the second embodiment, when the set load following evaporation amount JT is reliably secured by shifting the boilers belonging to the second boiler group 3B to the steaming transfer process, the required evaporation amount JN Various changes may be made, such as selecting a combustion position with the smallest difference evaporation amount among the combustion positions satisfying the above.

  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.

  Since load followability in the boiler group can be secured easily and efficiently, it can be used industrially.

DESCRIPTION OF SYMBOLS 1, 1A boiler system 2, 3 Boiler group 2A 1st boiler group 2B 2nd boiler group 4 Control part (controller)
21, 22, 23, 24 Boiler 31, 32, 33, 34, 35 Boiler

Claims (15)

A program for controlling a boiler group including a boiler having a plurality of stepwise combustion positions,
A first boiler group corresponding to the magnitude of the required load;
A second boiler group corresponding to the change in the required load, and
The first boiler group is:
Control each boiler and combustion position according to the required evaporation amount of the required load,
The second boiler group is:
When the required amount of evaporation of the required load causes a deficiency in the amount of evaporation being steamed in the first boiler group, each boiler and combustion so as to compensate for load followability of the first boiler group A program configured to control a position. The program according to claim 1,
A maximum evaporation amount of the required load;
A first evaporation amount smaller than the maximum evaporation amount;
The first evaporation amount is configured to be assigned to the first boiler group on the basis of the increase amount of the evaporation amount with respect to the first evaporation amount and the corresponding second evaporation amount in the boiler group. Program to do. A program according to claim 2, wherein
The total load following evaporation amount which totaled the load following evaporation amount of each boiler of the said boiler group is comprised so that said 2nd evaporation amount may be ensured. The program according to claim 3,
A program configured to secure the second evaporation amount by setting the total load following evaporation amount within a predetermined range with respect to the second evaporation amount. A program according to claim 3 or claim 4, wherein
A program configured to secure the second evaporation amount by setting the total load following evaporation amount to be equal to or greater than the second evaporation amount. A program according to any one of claims 3 to 5,
When totaling the total load following evaporation amount,
In the first boiler group and the second boiler group,
A program configured to calculate an evaporation amount that increases when the boiler during combustion shifts from the combustion position during combustion to the highest combustion position. A program according to any one of claims 3 to 5,
When totaling the total load following evaporation amount,
In the first boiler group and the second boiler group,
For the amount of evaporation that increases when the combustion boiler moves from the combustion position to the highest combustion position and the amount of evaporation that increases when the boiler in the steaming transition process moves to the lowest combustion position A program characterized in that it is configured to calculate. A program according to any one of claims 3 to 5,
When totaling the total load following evaporation amount,
In the first boiler group and the second boiler group,
For the amount of evaporation that increases when the burning boiler moves from the burning position to the uppermost combustion position and the amount of evaporation that increases when the boiler in the steaming transition process moves to the uppermost combustion position A program characterized in that it is configured to calculate. A program according to any one of claims 6 to 8,
When increasing the evaporation amount of the first boiler group,
Each boiler and combustion position are controlled so that the total evaporation amount is minimized by the combination of the combustion position during combustion and the combustion position selected from the combustion positions that can be sequentially shifted from the combustion position during combustion. A program characterized by being configured to do so. The program according to claim 9, wherein
When setting a combination that minimizes the total evaporation,
Based on the variable evaporation amount or a predetermined range of the variable evaporation amount, a combination of the combustion position during the combustion and a combustion position selected from the combustion positions that can be sequentially shifted from the combustion position during the combustion. A program configured to control each boiler and a combustion position by selecting from among the extracted combinations. A program according to any one of claims 2 to 10,
In the first boiler group, the transition destination combustion position corresponding to the increase in the evaporation amount corresponds to the combustion position corresponding to the first evaporation amount, and the transition destination combustion position corresponds to the second evaporation amount. A program configured to control each boiler and combustion position in preference to a boiler that is a combustion position. A program according to any one of claims 2 to 11,
A program configured to set the first evaporation amount corresponding to a combination of a boiler that burns for a longest time when the boiler group is operated and a combustion position.   A controller comprising the program according to any one of claims 1 to 12.   A boiler system comprising the controller according to claim 13.   The boiler system according to claim 14, wherein the highest combustion position among the combustion positions corresponding to the first evaporation amount of each boiler is a high-efficiency combustion position.

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