JPH0942604A - Automatic control method for number of boilers - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow sometimes an old boiler to work while a new boiler is worked with priority by a method wherein the working priority order of a boiler is displayed by one at every first set period and starting is effected according to either one condition of three different conditions on which starting is effected according to a specified order at every further longer second set period. SOLUTION: Boilers 1 are set in such a manner that the boilers are operated according to a working priority order but a working priority order is properly varied so that the operation times of the boilers 1 are averaged. First, the working priority orders of the boilers are varied by one at a first set period, for example, every day, and the working priority orders of the boilers are vaired at intervals of a second set period, for example, at every 30 days, longer than the first set period so that starting is effected according to some condition of a first condition wherein starting is effected sequentially from a boiler having a low combustion time, a second condition wherein starting is effected, sequentially, from a boiler having the low number of igniting times, and starting is effected according to a third condition wherein the above conditions are combined together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic number control in which a plurality of boilers such as hot water boilers, heat medium boilers, steam boilers, etc. are installed in parallel and the number of operating machines is automatically controlled according to the load condition. In the method, the present invention relates to an automatic number-of-units control method including a method of determining an operation priority order for averaging the operation status of each boiler.

[0002]

2. Description of the Related Art As is well known, a plurality of boilers are installed in parallel, and the number of operating boilers is automatically controlled according to a preset operation priority according to the load situation. A multi-can installation system is in place. This boiler multi-can installation system can operate each boiler with high efficiency as compared with installing one large capacity boiler. On the other hand, it has the advantage of excellent responsiveness.

In such a boiler multi-can installation system, when a part of the plurality of boilers, for example, an old boiler or a defective boiler is replaced with a new boiler, the following occurs. . In other words, the operation priority of the boiler is usually set to start from the one with shorter combustion time, so the new boiler has a higher operation priority than the old boiler already installed, and the new boiler has priority. Work normally. On the other hand, the old boiler has a problem that its operation priority remains low and it does not operate easily.

[0004]

SUMMARY OF THE INVENTION Even in the above-mentioned case, the present invention preferentially operates a new boiler having a short combustion time while occasionally operating an old boiler so that the boiler is partially operated. The purpose is not to concentrate on.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a plurality of boilers are installed, and the operation priority order in which the number of operating boilers is preset according to the load situation. In the method for automatically controlling the number of boilers controlled in accordance with the above, the operation priority of the boilers is changed by shifting one by one for each first setting period, and the combustion time is changed for each second setting period longer than the first setting period. The boiler must be activated according to any one of the first condition of starting from the smallest number, the second condition of starting from the smallest number of ignitions, and the third condition combining these conditions. The feature is that the operation priority is changed.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In an automatic boiler number control method for a boiler, in which a plurality of boilers are installed and the number of operating boilers is controlled according to a load condition in accordance with a preset operation priority order, In performing the change (rotation), a first setting period and a second setting period longer than the first setting period are set. And the first
The boiler operation priority is shifted and changed one by one for each set period, and the operation priority is changed so that those having smaller values are activated based on the combustion time or the number of ignitions for each second set period. . By doing so, all boilers will operate uniformly without the boiler operation being concentrated on some boilers. The present invention can be applied to boilers such as hot water boilers, heat medium boilers, and steam boilers.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following description will focus on embodiments in which the present invention is applied to a hot water boiler. In FIG. 1, a plurality of boilers 1 having heating means are installed in parallel, and outlet pipes 4 and return pipes 5 of these boilers 1 are connected to a forward header 6 and a return header 7 common to each boiler 1, respectively. ing. The forward header 6 and the return header 7 are connected by a circulation line 9 formed by inserting a load 2 and a circulation pump 8.

The forward header 6 and the return header 7
Corresponds to the collecting portion 3 of the heating fluid from the boiler 1. The forward header 6 is provided with a temperature detector 10 for detecting the temperature T of the heating fluid. In the case of a hot water boiler or a heat medium boiler, the temperature of the heating fluid is detected by the temperature detector 10, and in the case of a steam boiler, not the temperature but the pressure of the heating fluid is usually detected. The temperature detector 10 may be provided in the return header 7 depending on the implementation. Further, the temperature detector 10 is connected to the unit number control device 11 by a signal line.
Controls the number of operating boilers 1 based on the detection signal from the temperature detector 10. When the detected temperature is high, the number of operating boilers 1 is reduced, and when the detected temperature is low, the operating number of boilers 1 is increased.

The boilers 1 are set to operate in accordance with a preset operation priority order.
In order to average the operating time (combustion time), the operation priority order is changed (rotation) as appropriate.

As shown in FIG. 2, first, the operation priority order of each boiler is sequentially set to 1 for each first set period (for example, every day).
Change by shifting one by one, and change the second time longer than this first set period.
For each set period (for example, every 30 days), the first condition of starting from the one with the smallest combustion time, the second condition of starting from the one with the smallest number of ignitions, and the third condition combining these conditions The operation priority of each boiler is changed so that it starts up according to one of the conditions.

In the embodiment shown in the figure, four boilers (A, B, C, D) are installed, and the operating priority of each boiler is initially in the order of A, B, C, D. ing. For each first setting period (every day), the operation priority order of each boiler is sequentially shifted by one, A, B, C, D → D, A,
B, C → C, D, A, B → B, C, D, A are changed as follows, and this is repeated thereafter. As another example,
A, B, C, D → B, C, D, A → C, D, A, B →
As in D, A, B, and C, the operation priorities may be sequentially shifted one by one, and this may be repeated thereafter.

Then, every second setting period (every 30 days),
For example, the operating priorities are changed so that those having the shorter combustion time are started in order (first condition described above), that is, the operation priority is changed in the order of shorter combustion time. At this time, if the operation priority order is changed in accordance with this condition and the result becomes B, D, A, and C in order, again, the operation priority order of each boiler is sequentially set for each first set period (every day). Change by shifting, B, D, A, C → C, B, D, A → A, C, B, D
→ Change as D, A, C, B.

In this way, the change of the operation priority for each first setting period and the change of the operation priority for each second setting period are repeatedly performed, and all the boilers are operated uniformly.

A supplementary description will be given of the third condition, which is a combination of the above-mentioned condition of starting from the one having the smallest combustion time and the condition of starting from the one having the smallest number of ignitions. First, the magnitude of the combustion time is compared. At that time, the combustion times of the boilers are compared in a predetermined minimum unit (for example, every 10 hours). For example, the combustion time is 100 hours to 110 hours.
Those in the time range are considered to have the same combustion time, and those boilers are set to the operation priority order according to the magnitude of the number of ignitions.

Next, the operation of the above configuration will be described. The fluid heated in the boiler 1 collects in the outgoing header 6 through each outlet pipe 4, and is supplied from the outgoing header 6 to the load 2 through the circulation line 9. The fluid that has supplied a predetermined amount of heat to the load 2 returns to the return header 7 through the circulation line 9, and from this return header 7 each return pipe 5
Return to boiler 1 through. From the temperature detector 10 provided on the forward header 6 as the collecting unit 3, a temperature detection signal is sent to the unit number control device 11. Upon receiving the temperature detection signal, the number-of-units control device 11 follows the preset program,
The number of operating boilers 1 is controlled according to the temperature of the fluid.

The operation priority order of the boiler 1 is in accordance with a preset order. The operation priority order is appropriately changed and rotated every predetermined period. First, the operation priority order of each boiler 1 is sequentially shifted and changed for each first set period (for example, every day), and this is repeated. Then, the operation priority order of each boiler 1 is changed according to a predetermined condition for every second setting period (for example, every 30 days) longer than the first setting period. As the predetermined condition, any one of a first condition in which the combustion time is shortest, a second condition in which the ignition frequency is low, and a third condition in which these conditions are combined are selected. Adopt conditions. In this way, the change of the operation priority for each first setting period and the change of the operation priority for each second setting period are repeatedly performed.

According to the above-mentioned operation priority changing method,
All boilers can be operated uniformly without the boiler operation being concentrated on some boilers. Therefore, the operating time (combustion time) of each boiler can be averaged, and even in a system in which a new boiler and an old boiler are mixed, the new boiler is preferentially operated and the old boiler is appropriately operated. be able to.

[0018]

EFFECTS OF THE INVENTION Since the present invention has the above-described structure, the operation priority of the boiler is sequentially shifted and changed for each first setting period, and the combustion time or the number of ignitions is changed for each second setting period. Based on the above, it is possible to change the operation priority order so that those having smaller values will be operated, and all the boilers can be uniformly operated without the operation of the boiler being concentrated on a part of the boilers. In particular, even in a system in which a new boiler and an old boiler are mixed, the new boiler is preferentially operated, but the operation does not concentrate on the new boiler, and the old boiler can be appropriately operated,
By operating all boilers evenly, the operating time (combustion time) of each boiler can be averaged.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of changing the operation priority order according to the embodiment of the present invention.

[Explanation of symbols]

 1 Boiler 2 Load 3 Collecting part 4 Outlet pipe 5 Return pipe 6 Outgoing header 7 Return header 8 Circulation pump 9 Circulation line 10 Temperature detector 11 Unit control device

Claims (1)

[Claims] Claim: What is claimed is: 1. In a method for automatically controlling the number of boilers, in which a plurality of boilers are installed and the number of operating boilers is controlled in accordance with a preset operation priority order according to load conditions, the boiler operation priority order is It is changed by shifting one by one for each set period, and the second condition, which is longer than the first set period, is activated in order from the one with the smallest combustion time, the first condition, and the one with the smallest number of ignitions is activated. A method for automatically controlling the number of boilers, characterized in that the operation priority of the boilers is changed so that the boilers are activated according to any one of the second condition to be performed and a third condition in which these conditions are combined.