JP2668441B2 - Automatic setting method of number control pattern in boiler automatic number control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an automatic number control method for a boiler multi-can installation system, in which a number control pattern is automatically set.

[Conventional technology]

As is well known, in a multi-can installation system in which a plurality of boilers are installed, a pressure detector is provided on a steam header to grasp the state of the load, and the required number of units is determined according to a preset startup sequence according to the load amount. Shift to combustion sequentially
If there is a load change, an automatic number control method is adopted that follows the load by burning and stopping the boiler in accordance with the load change.

This automatic unit number control method can operate each boiler with high efficiency, maintain the efficiency of the entire system at a high level, and contribute to energy saving.

[Problems to be solved by the invention]

Therefore, in the automatic number control method described above, it is necessary to observe load variation data in advance when setting a specific number control pattern, and to set based on the observed data. It requires specialized knowledge and experience.

When the load condition differs depending on the time zone, a plurality of unit control patterns are set as in an automatic unit control device disclosed in Japanese Utility Model Application Laid-Open No. 21807/1985, and a more appropriate pattern is switched by a changeover switch as appropriate. However, if this is performed manually, the operation management becomes complicated, so a timer is usually provided to automatically switch the operation. However, if the load situation changes due to seasonal factors or changes in equipment, the existing unit control pattern will not be able to respond, and the number of boiler starts and stops will increase, and the response to load fluctuations will deteriorate. Disadvantages occur.

[Means for solving the problem]

The present invention has been made in view of the above-described problems, and has been made to automatically set and change an optimal number control pattern corresponding to a load situation. Specifically, a plurality of boilers are installed, and A common steam header was provided for each of the boilers, and the internal pressure of the header was converted into an electric signal by a pressure sensor and taken out, and the signal was used to burn and stop the required number of boilers according to the load, and a unit controller was provided. In the configuration, the change data of the past load in the predetermined range is discriminated and recorded for each time zone, and the number control pattern of each time zone is set from the maximum load amount and the maximum load fluctuation width of the data, and the maximum load amount is set. Alternatively, when there is a change in the maximum load fluctuation width, the number control pattern up to that point is changed, a new pattern is set, and the operation is continued.

[Action]

According to the present invention, the past load fluctuation data is stored for each time period, and the number control pattern of each time period is set based on the maximum load amount and the maximum load fluctuation width of the data. When the maximum load amount or the maximum load fluctuation range has changed compared to the previous time zone, the pattern of the unit control is changed as appropriate, so that the pattern setting and change by manual operation by humans are performed. By omitting it, it is possible to automatically obtain an optimal number control pattern.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

In the figure, (1) is a boiler equipped with a combustion device (5). In the example shown, there are four boilers, each connected to a common steam header (2) in a steam pipe (6). This steam header is provided with a pressure sensor (3) for detecting the internal steam pressure. Based on the pressure detection signal, the number controller (4) controls the combustion and stop of each boiler. It has become.

(7) is a data storage unit for storing, for each time period, past load fluctuation data (boiler operation status) in a predetermined range. For example, the operation state of the boiler is stored from a boiler operation stop command signal from the number controller (4), or the amount of used steam is measured and stored by the steam flow meter (8) inserted in the steam supply line. The maximum load amount S and the maximum load fluctuation width ΔS in each time zone are obtained from the stored data, and the number is controlled so that the entire multi-can installation system can be efficiently operated by satisfying them and can respond quickly to the load fluctuation. To the unit control pattern setting unit (9)
To select.

For example, the past load status is stored for several weeks for each day of the week and for each time period, and the number of boilers operated in that time period is set based on the maximum load amount in the same time period on the same day in the past (evaporation amount). If the maximum load is 4t / h in a system with four 1.5t / h boilers installed, three boilers should be set.)
When the steam pressure in the steam header falls below a predetermined range, the number of operating boilers is added.

In addition to the above-mentioned maximum load amount, the maximum load fluctuation width (maximum load fluctuation rate) in each time zone is determined and a unit control pattern is set. If the load condition is severe, the low combustion priority type pattern I as shown in FIG. 3 is selected. On the other hand, if the load condition is stable and the maximum load fluctuation width is equal to or less than a predetermined value, as shown in FIG. For example, an appropriate pattern is selected from the number control patterns prepared in advance, such as selecting a suitable pattern II (H: high combustion, L: low combustion, O: stop).

As described above, in addition to setting the number control pattern from the past data of the same time zone, data including the above-mentioned time of the time zone may be used.

Other ways to set the unit control pattern include setting the number of low fuel standby boilers to be greater than the maximum load fluctuation range, and when the load exceeds a predetermined load, always maintain the boilers for this number in low combustion to reduce sudden load fluctuations. Be able to respond quickly to If the number of boilers in the low combustion state exceeds the predetermined number for a certain period of time or more, it is considered that the load condition is stable, and one set of the low combustion boilers LL is sequentially set.
One of them is changed to the optimum number control pattern at any time according to the load condition, for example, one of them is set to the high combustion H and the other is set to the stop O state.

The boiler starts and stops according to a preset order,
Rotation of the start / stop order is appropriately performed so that the operation time of each boiler is averaged, and when an abnormal boiler occurs, the boiler of the next order is operated to perform backup control.

[Effects of the Invention] The present invention is configured as described above, stores past load fluctuation data for each time zone, and calculates the number control pattern of each time zone based on the maximum load amount and the maximum load fluctuation width of this data. After setting the number control pattern, if the maximum load amount or the maximum load fluctuation width has changed compared to the previous time zone, the number control pattern is changed as appropriate, It is possible to automatically and optimally obtain the optimum number control pattern by omitting the setting and changing of the pattern manually by a human. Therefore, there is no need to observe the load fluctuation data in advance, and if the standard pattern is set first, the optimal unit control pattern will be automatically selected from the data, so that a specialized pattern setting engineer Is unnecessary, and the operation management of the system becomes very easy.

In addition, since the optimal number control pattern is selected, unnecessary start / stop of the boiler is reduced, and the operation efficiency of the entire system can be maintained at high efficiency. Furthermore, it is possible to flexibly cope with a slight time lag in the load situation, especially when the load situation changes due to seasonal factors, or when the load situation changes due to a change in steam use equipment, etc. It can be automatically changed to the optimal number control pattern.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention, and FIG.
The figure is a graph showing an example of a change in the load situation in each time zone, and FIGS. 3 and 4 are time charts showing an example of the number control pattern. (1) Boiler (2) Steam header (3) Pressure sensor (4) Unit controller (5) Combustion device (6) Steam pipe (7) Data storage, (8) ... Steam flow meter (9) ... Unit control pattern setting unit

Claims (1)

(57) [Claims] A plurality of boilers (1) are installed, a common steam header (2) is provided for these boilers, and an internal pressure of the header is converted into an electric signal by a pressure sensor (3) and taken out. Unit controller for burning and stopping the required number of boilers according to the load (4)
In the configuration provided with, the load fluctuation data of the past load in a predetermined range is discriminated and stored for each time period, and the number control pattern of each time period is set from the maximum load amount and the maximum load fluctuation width of this data, When there is a change in the maximum load amount or the maximum load fluctuation range, the number of boilers in the automatic number control device of the boiler is changed by changing the number control pattern up to that time, setting a new pattern and continuing operation. Automatic setting method of control pattern.