JP2012017940A - Program, controller, and boiler system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a program that can easily and efficiently secure a load followability to a sudden increase in a request load and control chattering, or the like even if a sudden fluctuation occurs in boiler groups including boilers having a plurality of staged combustion positions, and to provide a controller and a boiler system.SOLUTION: The program that controls the group of boilers including the plurality of staged combustion positions is configured to select the combustion position or a combustion stopping position of each boiler based on the maximum evaporation amount that an operating boiler can output in the group of boilers, a first evaporation amount smaller than the maximum evaporation amount and a second evaporation amount corresponding to an increase width of the evaporation amount in the boilers in the groups of boilers relative to the first evaporation amount.

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 may fluctuate due to various factors including daily factors, time factors, operation factors, etc., and even if the required load on the boiler group is small, the fluctuation (increase in required load) ) The width may be large, and large fluctuations may occur rapidly.
When such a sudden and large increase in required load occurs, the steam supplied by the boiler group becomes insufficient, and chattering due to the time lag with respect to the required load and the start / stop of the boilers constituting the boiler group are likely to occur.

  Further, when the boiler group includes a boiler having a large turndown ratio (maximum combustion amount / minimum combustion amount) (for example, low combustion position: medium combustion position: high combustion position = 1: 2: 5), differential evaporation is performed. When a large combustion position is turned ON / OFF (virtual boiler starts / stops), time lag and chattering become conspicuous. Therefore, even if the increase in required load is large, a strong technology for technology that can easily ensure load followability There is a special request.

  The present invention has been made in consideration of such circumstances, and easily and efficiently provides load followability to a sudden increase in required load in a boiler group including boilers having a plurality of staged combustion positions. An object of the present invention is to provide a program, a controller, and a boiler system that can ensure and suppress chattering and the like even if a sudden load fluctuation occurs.

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, and a maximum evaporation amount of a required load and a first evaporation smaller than the maximum evaporation amount. The boiler and the combustion position are controlled based on the amount and the second evaporation amount corresponding to the increase amount of the evaporation amount in the boiler group with respect to the first evaporation amount. And

  The invention described in claim 11 is a controller, comprising the program described in any one of claims 1 to 10.

  The invention described in claim 12 is a boiler system, characterized in that the controller according to claim 11 is provided.

  According to the program according to the present invention, since each boiler and the combustion position are controlled based on the maximum evaporation amount of the required load, the first evaporation amount, and the second evaporation amount, the maximum evaporation amount of the required load, the first evaporation amount, Secure the total evaporation amount corresponding to the evaporation amount, the second evaporation amount (total evaporation amount of each boiler), and the total load following evaporation amount (total of the load following evaporation amount of each boiler) to increase the required load It can respond easily and efficiently.

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. 13, due to technical reasons in operation of the boiler group, as shown in FIG. 13, even if the maximum evaporation amount of the required load = first evaporation amount + second evaporation amount does not hold, the maximum evaporation amount of the required load 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.

  The invention according to claim 2 is the program according to claim 1, wherein the total follow-up evaporation amount of each boiler is summed until the total evaporation amount obtained by summing the evaporation amounts of the boilers exceeds the first evaporation amount. The total load following evaporation amount is configured to ensure the second evaporation amount.

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 3 is the program according to claim 2, 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 4 is a program of Claim 2 or Claim 3, 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 5 is the program according to any one of claims 2 to 4, wherein when the total load following evaporation amount is summed, the boiler during combustion is in combustion. It is configured to calculate the amount of evaporation that increases when the combustion position shifts from the combustion position to the highest combustion position.

  According to the program according to the present invention, each boiler that is steamed at a combustion position lower than the uppermost combustion position is increased when the combustion position is changed from the combustion position during combustion to the uppermost combustion position (to be operated). By calculating the total load following evaporation amount for the evaporation amount to be obtained and securing the load following evaporation amount corresponding to the second evaporation amount, the evaporation amount can be increased in a short time, and the load followability is improved. It can be improved 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.

  Invention of Claim 6 is a program of any one of Claim 2-4, Comprising: When the said total load following evaporation amount is totaled, the said boiler during combustion is in combustion It is configured to calculate the evaporation amount that increases when the combustion position shifts from the combustion position to the highest combustion position and the evaporation amount that increases when the boiler in the steaming transition process shifts to the lowest combustion position. It is characterized by.

According to the program according to the present invention, when the total load following evaporation amount corresponding to the second evaporation amount is ensured, the combustion during combustion of each boiler steamed at the combustion position lower than the uppermost combustion position is performed. The amount of evaporation that increases when moving from the position to the uppermost combustion position (to be operated), and the amount of evaporation that increases when the boiler in the steaming transition process shifts from the steaming transition process to the lowest combustion position 1 corresponding to the difference evaporation amount).
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 7 is the program according to any one of claims 2 to 4, wherein when the total load following evaporation amount is summed, the boiler during combustion is in combustion. It is configured to calculate the evaporation amount that increases when the combustion position shifts from the combustion position to the highest combustion position and the evaporation amount that increases when the boiler in the steaming transition process shifts to the highest combustion position. It is characterized by.

According to the program according to the present invention, when the total load following evaporation amount corresponding to the second evaporation amount is ensured, the combustion during combustion of each boiler steamed at the combustion position lower than the uppermost combustion position is performed. Evaporation amount that increases when moving from the position to the highest combustion position (operation target) and increases when the boiler in the steaming transition process is moved from the steaming transition process to the top combustion position (operation target) The total evaporation amount is calculated.
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 8 is a program of any one of Claim 5-7, Comprising: When increasing the evaporation amount of the said boiler group, the combustion position in combustion, and the said combustion It is configured to control each boiler and the combustion position 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 in the inside is minimized. Features.

  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.

  The invention according to claim 9 is the program according to claim 8, wherein when a combination that minimizes the total evaporation amount is set, the combustion position during combustion and the combustion position during combustion are determined. A combination with a combustion position selected from the combustion positions that can be shifted sequentially is selected from among the combinations of combustion positions that have been extracted with the total load following evaporation amount being able to secure the second evaporation amount. Each boiler and the combustion position are controlled.

  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.

  A tenth aspect of the present invention is the program according to any one of the first to ninth aspects, wherein a combustion position at a transition destination associated with an increase in the evaporation amount corresponds to the first evaporation amount. The boiler which is a combustion position is configured to control each boiler and the combustion position in preference to the boiler whose combustion position at the transition destination is a combustion position corresponding to the second evaporation amount. To do.

  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 11 is the program according to any one of claims 1 to 10, wherein the boiler that burns the first evaporation amount for a 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 14 is the boiler system according to claim 13, 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, the highest combustion position among the combustion positions corresponding to the first evaporation amount is the high-efficiency combustion position, so that the combustion efficiency of the boiler group can be improved efficiently. it can.

According to the program, the controller, and the boiler system according to the present invention, in a boiler group including boilers having a plurality of staged combustion positions, even if the required evaporation amount increases rapidly due to an increase in required load, load follow-up Efficiency can be ensured efficiently.
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 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.

FIG. 2 is a diagram conceptually showing the boilers 21,..., 24 constituting the boiler group 2, and the boiler group 2 includes the first boiler 21, the second boiler 22, the third boiler 23, and the fourth boiler. And a boiler 24.
Moreover, each boiler 21, ..., 24 is 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), respectively. Position) is a four-position boiler that can be controlled in four stepwise combustion states, each having a first differential evaporation amount of 1000 (kg / h), a second differential evaporation amount of 1000 (kg / h), and a third difference. The evaporation amount is 1000 (kg / h), and the rated evaporation amount is 3000 (kg / h).
Moreover, as for each boiler 21, ..., 24, the 2nd combustion position is made into the highly efficient combustion position.

Each frame shown in FIG. 2 represents each boiler 21,..., 24, and a section that divides the frame representing each boiler 21,.
Further, the combustion positions of the boilers are the first to third combustion positions from the bottom, and the number (1000) written in each combustion position is the difference evaporation amount ΔJR (kg / h) at each combustion position, and the difference evaporation The number indicated by () next to the quantity ΔJR (kg / h) is the combustion order (operation order) of the combustion position selected by the control unit 4 when the flow chart of FIG. 4 is executed.
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).

Moreover, in this embodiment, the priority and spare can of each boiler 21, ..., 24 are set automatically, and each boiler 21, ..., 24 is a 2nd highly efficient combustion position according to a priority. It became a combustion position (medium combustion state), and all the boilers to be operated reached the second combustion position (if there is a boiler whose high-efficiency combustion position is a spare can, the highest combustion position for the boiler) Later, the high combustion state higher than the high efficiency combustion position is sequentially shifted according to the priority order.
Note that it is possible to arbitrarily set whether the priority order and the spare can are set automatically or manually.

  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. 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 the maximum evaporation amount JM of the required load = first evaporation amount JS1 + second evaporation amount JS2.
The combustion positions corresponding to the first evaporation amount JS1 and the second evaporation amount JS2 are stored in the memory 42, for example.

  Further, the control unit 4 corresponds to either the first evaporation amount JS1 or the second evaporation amount JS2 as the combustion position to be operated, and at this time, corresponds to the first evaporation amount JS1. The highest combustion position among the combustion positions is set as a highly efficient combustion position as much as possible.

Of the combustion positions corresponding to the first evaporation amount JS1, when all the highest combustion positions are not the high-efficiency combustion positions, for example, when all of the combustion positions corresponding to the first evaporation amount JS1 are steamed. A combustion position combination that maximizes the combustion efficiency of the boiler group 2 is set.
Moreover, instead of setting the combustion efficiency of the boiler group 2 to the highest efficiency when all the highest combustion positions among the combustion positions corresponding to the first evaporation amount JS1 are not the high efficiency combustion positions, for example, Of the combustion positions corresponding to one evaporation amount JS1, as many uppermost combustion positions as possible may be configured to coincide with the high efficiency combustion positions.

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).
In addition, when selecting the boiler and the combustion position (including the combustion stop position), after all the boilers that have been operated have reached the second combustion position (high-efficiency combustion position), a higher rank than the high-efficiency combustion position. It shifts to the third combustion position.
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. 0 indicates that the pressure maintaining 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 maintaining state in the steaming transition process. Means the total load following evaporation.

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 is configured so that the evaporation amount (rated evaporation amount) that can be output from the boiler group 2 is equal to or greater than the maximum evaporation amount JM of the required load. 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 in which the total evaporation amount JR is increased, and only one combustion position is brought into the combustion state at a time regardless of whether the total evaporation amount JR and the total load following evaporation amount JG are excessive or insufficient. The shift (that is, the increase in the differential evaporation amount is 1000 (kg / h)).
(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 amount JG obtained by summing the following evaporation amounts, and for the first evaporation amount (for example, the average output of the boiler group 2) JS1 and the first evaporation amount A second evaporation amount JS2 and a set load following evaporation amount JT (= JS2) corresponding to the increase amount of the evaporation amount in the boiler group are set (S1).
(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 and the combustion position to be operated are set so as to satisfy the rated output of the boiler group 2 ≧ the maximum evaporation amount JM of the required load.
(4) The calculation unit 43 assigns each combustion position that is an operation target in the boiler group 2 to either the first evaporation amount JS1 or the second evaporation amount JS2 (S4).
(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) The calculation unit 43 is located at a combustion position or a combustion stop position less than the high efficiency combustion position (second combustion position), and a boiler that can move to a higher combustion position that is an operation target below the high efficiency combustion position. It is determined whether it exists (S8).
If there is 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 transferred to a higher combustion position that is the operation target, the process proceeds to S9. If it does not exist, the process proceeds to S15.
(9) The calculation unit 43 transfers the boiler with the highest priority during combustion below the high-efficiency combustion position acquired from the total load following evaporation amount JG and the third database 45C to the combustion position one level higher. Based on the difference evaporation amount ΔJR and the set load following evaporation amount JT stored in the memory 42, it is determined whether or not (total load following evaporation amount JG−difference evaporation amount ΔJR ≧ set load following evaporation amount JT). (S9).
If (total load following evaporation amount JG−difference evaporation amount ΔJR ≧ set load following evaporation amount JT), even if the boiler having the highest priority during combustion is shifted to the combustion position one step higher, Since the load following evaporation amount JG satisfies the set load following evaporation amount JT, the process shifts to S10 in order to move the boiler under combustion below the high-efficiency combustion position to the upper combustion position, and the total load following evaporation amount JG-differential evaporation. If the amount ΔJR ≧ the set load following evaporation amount JT, the process proceeds to S13 in order to suppress the decrease in the load following evaporation amount JG. In addition, also when there is no boiler in combustion below the highly efficient combustion position, it transfers to S13.
(10) The computing unit 43 outputs a signal for shifting the boiler having the highest priority in the combustion order below the high-efficiency combustion position to the combustion position one level higher (S10). If a signal is output, it will transfer to S11.
(11) The computing unit 43 refers to the third database 45C and calculates the total evaporation amount JR after the transition (S11). The calculated total evaporation amount JR is stored in the memory 42. If S11 is performed, it will transfer to S12.
(12) The computing unit 43 refers to the third database 45C and calculates the total load following evaporation amount JG (S12). The calculated total load following evaporation amount JG is stored in the memory 42. If S12 is performed, it will transfer to S5.
(13) The computing unit 43 determines whether there is a boiler at the combustion stop position (S13).
If there is a boiler at the combustion stop position, the process proceeds to S14, and if there is no boiler at the combustion stop position, the process proceeds to S10.
(14) The computing unit 43 outputs a signal for shifting the boiler having the highest priority among the boilers at the combustion stop position to the combustion position one level higher (S14). If a signal is output, it will transfer to S11.
(15) The computing unit 43 determines whether or not there is a boiler that burns at the high-efficiency combustion position or higher and can move to a higher combustion position (S15).
If there is a boiler that burns at the high-efficiency combustion position and can move to a higher combustion position, the process proceeds to S16, and if there is no boiler that burns below the high-efficiency combustion position, the process proceeds to S5.
(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 S11.
The above (5) to (16) 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. 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 7800 (kg / h), the second evaporation amount JS2, that is, the set load following evaporation amount JT is 3100 (kg / h).

First, when the operation is started, the calculation unit 43 executes S1 and S2 to calculate the maximum evaporation amount JM of the required load.
Next, S3 is performed and the operation target boiler in the boiler group 2 is set. Thereby, a spare can is set (S3).
Next, S4 is executed, and combustion positions corresponding to the first evaporation amount JS1 and the second evaporation amount JS2 are assigned. This combustion position is assigned to each boiler 21 according to the priority order so that the highest combustion position among the combustion positions corresponding to the first evaporation amount becomes the high efficiency combustion position (the second combustion position in this embodiment). ..., assigned to 24.

Next, the process proceeds in the order of S5 and S6.
If the required evaporation amount JN calculated in S6 is zero, in S7, the total evaporation amount JR <the required evaporation amount JN (zero) does not hold, 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 arithmetic unit 43 proceeds to S5, S6, S7, S8 in this order, and in S8, the first boiler at the combustion stop position (less than the second combustion position). Since 21 exists, the process proceeds to S9.
Next, (total load following evaporation amount JG (= zero (kg / h)) in S9−difference evaporation amount ΔJR (= 1000 (kg / h)) when the first boiler 21 is shifted to the second combustion position) ) Is minus 1000 (kg / h), and (total load following evaporation JG−difference evaporation ΔJR when the first boiler 21 is shifted to the second combustion position) ≧ set load following evaporation JT (= 3100) Since (kg / h) is not satisfied, the process proceeds to S13.
Next, the determination in S13 is that there is a boiler at the combustion stop position, so that the process proceeds to S14. By executing S14, the first combustion position of the first boiler 21 becomes the combustion state (operation order 1), and then S11, S12 is executed.
In the state where the operation sequence 1 is executed, the total evaporation amount JR is 1000 (kg / h), the total load following evaporation amount JG is 2000 (kg / h), and the total load following evaporation amount JG is the set load following evaporation amount. JT (= 3100 (kg / h)) is not satisfied.
In this embodiment, when one of the boilers shifts to a higher combustion position and changes to a combustion state corresponding to the operation order N (in this embodiment, an integer of N = 1, 2,..., 11), S5, S6, and S7 are repeated until the required evaporation amount JN corresponding to the operation sequence (N + 1) is increased and the total evaporation amount JR <the required evaporation amount JN in S7 becomes “YES”.
(2) Next, for example, when the required evaporation amount JN exceeds 1000 (kg / h), S5, S6, S7, S8, S9, S13, and S14 are executed, and the first combustion position of the second boiler 22 is executed. Becomes a combustion state (operation order 2), and then S11 and S12 are executed.
In the state where the operation sequence 2 is executed, the total evaporation amount JR is 2000 (kg / h), the total load following evaporation amount JG is 4000 (kg / h), and the total load following evaporation amount JG is the set load following evaporation amount. JT (= 3100 (kg / h)) is satisfied.
(3) Next, when the required evaporation amount JN exceeds 2000 (kg / h), the process proceeds in the order of S5, S6, S7, and S8, and in S8, combustion occurs at a position less than the high efficiency combustion position (second combustion position). It is determined that there is an existing boiler, and the process proceeds to S9, and then (total load following evaporation amount JG (= 4000 (kg / h)) in S9—the first boiler 21 is shifted to the second combustion position. The difference evaporation amount ΔJR (= 1000 (kg / h)) in this case is 3000 (kg / h), and (the total load following evaporation amount JG−the difference when the first boiler 21 is shifted to the second combustion position) Since the evaporation amount ΔJR) ≧ the set load following evaporation amount JT (= 3100 (kg / h)) is not satisfied, the process proceeds to S13.
Next, the determination in S13 is that there is a boiler at the combustion stop position, so that the process proceeds to S14, and by executing S14, the first combustion position of the third boiler 23 becomes the combustion state (operation order 3), and thereafter S11. , S12 is executed.
In a state in which the operation sequence 3 is executed, the total evaporation amount JR is 3000 (kg / h), the total load following evaporation amount JG is 6000 (kg / h), and the total load following evaporation amount JG is the set load following evaporation amount. JT (= 3100 (kg / h)) is satisfied.
(4) Next, when the required evaporation amount JN exceeds 3000 (kg / h), the process proceeds in the order of S5, S6, S7, S8, and S9.
(Total load following evaporation amount JG (= 6000 (kg / h))-second combustion of the first boiler 21 when the first boiler 21 having the highest priority calculated in S9 is shifted to a higher combustion position) Since the difference evaporation amount ΔJR (= 1000 (kg / h)) in the case of shifting to the position is 5000 (kg / h) (≧ set load following evaporation amount JT3100 (kg / h)), the process proceeds to S10. .
If S10 is performed, the 2nd combustion position of the 1st boiler 21 will be in a combustion state (operation order 4), and S11 and S12 will be performed after that.
In the state where the operation sequence 4 is executed, the total evaporation amount JR is 4000 (kg / h), the total load following evaporation amount JG is 5000 (kg / h), and the total load following evaporation amount JG is the set load following evaporation amount. JT (= 3100 (kg / h)) is satisfied.
(5) Next, when the required evaporation amount JN exceeds 4000 (kg / h), the operation sequence 5 is executed in the same flow as the operation sequence 4, whereby the second boiler 22 is moved to the second combustion position. In the state where the operation sequence 5 is executed, the total evaporation amount JR is 5000 (kg / h), the total load following evaporation amount JG is 4000 (kg / h), and the total load following evaporation amount JG is the set load. The following evaporation amount JT (= 3100 (kg / h)) is satisfied.
(6) Next, when the required evaporation amount JN exceeds 5000 (kg / h), the process proceeds in the order of S5, S6, S7, and S8. In S8, there is a boiler that burns below the highly efficient combustion position. The process proceeds to S9.
Calculated in S9 (total load following evaporation amount JG (= 4000 (kg / h)) − difference evaporation amount ΔJR (= 1000 (kg / h)) when the fourth boiler 24 is shifted to the second combustion position)) Is 3000 (kg / h) (<set load following evaporation JT3100 (kg / h)), the process proceeds to S13.
Next, in S13, since there is a boiler at the combustion stop position, the process proceeds to S14, and by executing S14, the first combustion position of the fourth boiler 24 becomes the combustion state (operation order 6), and thereafter S11. , S12 is executed.
In the state in which the operation sequence 6 is executed, the total evaporation amount JR is 6000 (kg / h), the total load following evaporation amount JG is 5000 (kg / h), and the total load following evaporation amount JG is the set load following evaporation amount. JT (= 3100 (kg / h)) is satisfied.
(7) Next, when the required evaporation amount JN exceeds 6000 (kg / h), the process proceeds in the order of S5, S6, S7, and S8. In S8, there is a boiler that burns below the high efficiency combustion position. The process proceeds to S9.
Calculated in S9 (total load following evaporation amount JG (= 4000 (kg / h)) − difference evaporation amount ΔJR (= 1000 (kg / h)) when the third boiler 23 is moved to the second combustion position)) Is 4000 (kg / h) (≧ set load following evaporation JT3100 (kg / h)), the process proceeds to S10.
By performing S10, the 2nd combustion position of the 3rd boiler 23 will be in a combustion state (operation order 7), and S11 and S12 are performed after that.
In the state where the operation sequence 7 is executed, the total evaporation amount JR is 7000 (kg / h), the total load following evaporation amount JG is 4000 (kg / h), and the total load following evaporation amount JG is the set load following evaporation amount. JT (= 3100 (kg / h)) is satisfied.
(8) Next, when the required evaporation amount JN exceeds 7000 (kg / h), the process proceeds in the order of S5, S6, S7, S8, S9, and the total load following evaporation amount JG in S9 (= 4000 (kg / h h))-The difference evaporation amount ΔJR (= 1000 (kg / h)) when the third boiler 23 is moved to the second combustion position is 3000 (kg / h) (<set load following evaporation amount JT3100 ( kg / h)), the process proceeds to S13.
Next, the determination in S13 proceeds to S10 because there is no boiler at the combustion stop position. By performing S10, the 2nd combustion position of the 4th boiler 24 will be in a combustion state (operation order 8), and S11 and S12 are performed after that.
In the state where the operation sequence 8 is executed, the total evaporation amount JR is 8000 (kg / h), the total load following evaporation amount JG is 3000 (kg / h), and all the combustion positions corresponding to the first evaporation amount JS1 are In a combustion state, the first evaporation amount JS1 (= 7800 (kg / h)) is satisfied, and all the boilers 21,..., 24 are positioned at the high efficiency combustion position.
At this time, the total load following evaporation amount JG does not satisfy the set load following evaporation amount JT (= 3100 (kg / h)).
(9) Next, when the required evaporation amount JN exceeds 8000 (kg / h), the process proceeds in the order of S5, S6, S7, and S8, and the determination in S8 is that the boiler that is burning below the highly efficient combustion position is Since it does not exist, the process proceeds to S15.
Next, the determination in S15 proceeds to S16 because there is a boiler that can be shifted to a higher combustion position.
By performing S16, the 3rd combustion position of the 1st boiler 21 will be in a combustion state (operation order 9), and S11 and S12 will be performed after that.
In the state where the operation sequence 9 is executed, the total evaporation amount JR is 9000 (kg / h), the total load following evaporation amount JG is 2000 (kg / h), and the total load following evaporation amount JG is the set load following evaporation amount. JT (= 3100 (kg / h)) is not satisfied.
10) Next, the operation sequences 10 and 11 when the required evaporation amount JN exceeds 9000 (kg / h) and 10000 (kg / h) are executed in the same flow as the operation sequence 9, and the second boiler 22 In the state where the third boiler 23 is sequentially shifted to the third combustion position and the operation sequences 10 and 11 are executed, the total evaporation amount JR is 10000 (kg / h), 11000 (kg / h), and the total load follow-up. The evaporation amount JG is 1000 (kg / h) and zero (kg / h).

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 11) are executed are as shown in FIG. 5 as described above.
After the operation sequence 8 is performed, the high-efficiency combustion position shifts to a higher combustion position, so the total load following evaporation amount JG only decreases. By executing the operation sequence 8, the total load following operation is performed. Although the evaporation amount JG does not satisfy the set load following evaporation amount JT (= 3100 (kg / h)), in this embodiment, the total evaporation amount JR ≧ the required evaporation amount JN is equal to the total load following evaporation amount JG ≧ setting. In order to give priority to the load following evaporation amount JT, the operation order 9 to 11 is continuously performed.

  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, and to suppress the occurrence of a time lag with respect to the required load and the occurrence of chattering in the boiler group 2.

  Moreover, according to the boiler system 1, the amount of evaporation that increases when the combustion position that can be shifted to the upper position is shifted to the third combustion position, which is the highest combustion position, and the supply of each of the boilers 21,. The total load following evaporation amount JG is calculated by adding the amount of evaporation that increases when the boiler in the steaming transition process is moved to the third combustion position, so that the boiler to be steamed and the boiler to transition to the steaming transition process The number of units can be reduced to suppress excessive energy consumption.

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,. It is the point provided with the boiler group 3 which consists of three boilers instead of the boiler group 2 which consists of 4 units | sets of the 4th boiler 24. FIG.

  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, and a third boiler 33. In this embodiment, the first boiler 31, the second boiler 32, and the second boiler The three boilers 33 have different combustion positions and different evaporation amounts.

FIG. 7 is a diagram conceptually showing the first boiler 31, the second boiler 32, and the third boiler 33 that constitute the boiler group 3, and each frame has the first boiler 31, the second boiler 32, and the third boiler 33. Represents the combustion positions of the first boiler 31, the second boiler 32, and the third boiler 33.
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

The first boiler 31 is a four-position boiler having a first differential evaporation amount of 500 (kg / h), a second differential evaporation amount of 1000 (kg / h), and a third differential evaporation amount of 2000 (kg / h). The rated evaporation amount is 3000 (kg / h).
The second boiler 32 is a four-position boiler having a first differential evaporation amount of 1000 (kg / h), a second differential evaporation amount of 1500 (kg / h), and a third differential evaporation amount of 1500 (kg / h). The rated evaporation amount is 4000 (kg / h).
The third boiler 33 has 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).
Moreover, in 2nd Embodiment, the boiler group 3 shall set the 2nd 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 the 1st boiler 31, the 2nd boiler 32, and the 3rd boiler 33 are in the steaming transfer process, it shifts to the 1st combustion position in a short time, and secures the total load tracking evaporation amount, thereby load tracking. Can be improved.
In this embodiment, the steaming transition process refers to the period from the combustion stop position in the first boiler 31, the second boiler 32, and the third boiler 33 until the first combustion position is reached and steaming is performed. The 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, the first combustion position of the first boiler 31, the first combustion position of the second boiler 32, The first combustion position of the third boiler 33 is assigned to the first evaporation amount JS1.
Also, the third combustion position of the second combustion position of the first boiler 31 is assigned with the fluctuation range of the evaporation amount that fluctuates beyond the first evaporation amount JS1 as 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 illustrated in FIG. 8, the third database 45 </ b> C includes the differential evaporation amount Ji (j) at each combustion position of the first boiler 31, the second boiler 32, and the third boiler 33, the first boiler 31, Numerical data indicating the total load following evaporation amount GiA (j), GiB (j), GiC (j) when the two boilers 32 and the third boiler 33 are in the steaming transition process and each combustion position are in the form of a data table. Stored.

Here, i (= 31, 32, 33) 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.

The outline of the program according to the second embodiment will be described below with reference to FIGS. 9 and 10. 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).
(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).
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 is a table showing 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), and the first boiler 31 and the second boiler in the combination of combustion positions. The state of each combustion position of the boiler 32 and the 3rd boiler 33 is shown.
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.

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.

In addition, in FIG. 12, although the steaming transfer process is not described, it is needless to say that any boiler may be transferred to the steaming transfer process when the total load following evaporation amount is increased.
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 and the combustion position during combustion to be canceled is selected.

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.
Further, in FIG. 12A, the required evaporation amount JN of the boiler group 3 is increased to 1000 (kg / h), and in FIG. 12B, the required evaporation amount JN of the boiler group 3 is increased to 2000 (kg / h). It is assumed that the set load following evaporation amount JT is 3000 (kg / h).
Note that the first evaporation amount JS1 and the maximum evaporation amount JM of the required load are omitted for simplicity.

(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 = 2000 (kg / h)
It is. 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 = 4500 (kg / h)
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 = 3500 (kg / h)
4) Combustion position combination; 31 (1) +33 (1) +31 (2) +31 (3)
With this combination of combustion positions, combustion of 31 (2) +31 (3) is newly started,
Total evaporation JR = 4000 (kg / h)
Total load following evaporation JG = zero (kg / h)
5) 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 = 3000 (kg / h)
6) Combustion position combination; 31 (1) +33 (1) +31 (2) +31 (3) +32 (1)
In this combination of combustion positions, combustion of 31 (2) +31 (3) +32 (1) is newly started,
Total evaporation JR = 5000 (kg / h)
Total load following evaporation JG = 1500 (kg / h)
7) 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 = 2000 (kg / h)
8) Combustion position combinations; 31 (1) + 33 (1) + 31 (2) + 31 (3) + 32 (1) + 31 (2)
In this combination of combustion positions, combustion of 31 (2) +31 (3) +32 (1) +31 (2) is newly started,
Total evaporation JR = 6500 (kg / h)
Total load following evaporation JG = zero (kg / h)
The combination of combustion positions 1) to 8) above is generated.
(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 (= 3000 (kg / h)) is extracted, the set load following evaporation amount is obtained. Since JT = 3000 (kg / h), the above three methods 2), 3) and 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 = 1800 (kg / h Therefore, the minimum 2) is selected when the total evaporation amount JR is 1800 (kg / h) or more.
(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.

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.

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 four three-position boilers, and the boiler group 3 constituting the boiler system 1A is constituted by three different types of boilers. As described above, the number of boilers forming the boiler groups 2 and 3 and the configuration of each boiler (for example, the number of combustion positions, the difference evaporation amount at each combustion position, etc.) can be arbitrarily set.

Moreover, in the said embodiment, although the boiler group 2 demonstrated the case where the 2nd combustion position of each boiler 21, 22, 23, 24 corresponding to 1st evaporation amount JS1 is a high efficiency combustion position, It is possible to arbitrarily set whether the combustion position is set as the high efficiency combustion position.
For example, either the first combustion position or the third combustion position may be set as the high-efficiency combustion position. For example, in a boiler having five or more positions, the combustion position at or above the fourth combustion position may be set as the high-efficiency combustion position.
Moreover, you may set the combustion position of a different stage in each boiler as a highly efficient combustion position.

  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 of the boilers is shifted to the upper combustion position and the set load following evaporation amount JT cannot be secured, the boiler having the highest priority is shifted to the first combustion position. The case where the required evaporation amount JN and the set load following evaporation amount JT are secured has been described. For example, in addition to the transition of one of the boilers to the upper combustion position, the other boilers are shifted to the steaming transition process. It is good also as a structure which supplements the reduction | decrease amount of load following evaporation.

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.

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.

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

1, 1A boiler system 2, 3 boiler group 4 control unit (controller)
21, 22, 23, 24 Boiler 31, 32, 33, 34 Boiler

Claims (14)

A program for controlling a boiler group including a boiler having a plurality of stepwise combustion positions,
The maximum evaporation amount of the required load in the boiler group,
A first evaporation amount smaller than the maximum evaporation amount;
Based on the second evaporation amount corresponding to the increase amount of the evaporation amount in the boiler group with respect to the first evaporation amount,
A program configured to control each boiler and a combustion position. The program according to claim 1,
Until the total evaporation amount of the total evaporation amount of each boiler exceeds the first evaporation amount,
The total load following evaporation amount which totaled the load following evaporation amount of each said boiler is comprised so that said 2nd evaporation amount may be ensured. The program according to claim 2,
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 2 or claim 3, 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 2 to 4,
When totaling the total load following evaporation amount,
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 2 to 4,
When totaling the total load following evaporation amount,
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 2 to 4,
When totaling the total load following evaporation amount,
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 5 to 7,
When increasing the amount of evaporation of the 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 8, wherein
When setting a combination that minimizes the total evaporation,
The total load following evaporation amount can secure the second evaporation amount for 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 that is configured to control each boiler and combustion position by selecting from combinations of combustion positions extracted as things. A program according to any one of claims 1 to 9,
Compared to a boiler whose combustion position corresponding to the first evaporation amount is a combustion position corresponding to the first evaporation amount and a boiler whose combustion position corresponding to the second evaporation amount is a combustion position corresponding to the second evaporation amount. A program configured to preferentially control each boiler and combustion position. A program according to any one of claims 1 to 10,
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 11.   A boiler system comprising the controller according to claim 12.   14. The boiler system according to claim 13, 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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