JP3538313B2 - Boiler number control device that changes operation control pattern - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling the number of boilers for changing an operation control pattern.

[0002]

2. Description of the Related Art In a multi-can boiler system in which a plurality of boilers for performing combustion control at three positions of high combustion, low combustion, and stop are installed, a pressure detecting device is provided in a steam collecting portion to detect steam pressure. The operation of each boiler is controlled according to the steam pressure. In the case of three-position combustion control, the amount of steam generated in low combustion is half of the amount of steam generated in high combustion, and the amount of steam generated in the case of two low combustions is equal to the amount of steam generated in the case of one high combustion. Become. Therefore, as a pattern of the operation control, a pattern in which the number of low combustions is increased and the number of high combustions is reduced accordingly, or a pattern in which the number of high combustions is increased and the number of low combustions is reduced correspondingly can be considered.

An operation control pattern, which is a table in which the steam pressure value and the operation state of each boiler are tabulated, is set in the number control device, and the number control device uses the steam pressure value detected by the pressure detection device to operate the boiler. Determine the driving state,
Control the operation of each boiler. The operation control pattern is determined in advance according to the use environment of the boiler at the time of installation of the boiler system, and the unit control device uses the set operation control pattern to attain the operation state determined by the pressure value of the steam collecting portion. Automatically controls the operation of However, the best operation control pattern may differ from the set operation control pattern depending on the condition of the boiler system or other equipment, and if the operation control pattern is fixed, the optimum operation control pattern In some cases, the operation of the boiler is controlled by an operation control pattern different from the operation control pattern.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a unit control apparatus for operating a boiler in an optimum pattern by changing the operation control pattern to an optimum operation control pattern.

[0005]

A boiler system in which a plurality of boilers are installed, wherein a pressure detecting device for detecting a steam pressure in a steam collecting part of each boiler is provided, and the detected steam pressure value is set. In the number control device of boilers for controlling the operation of each boiler so that the operation state is determined by the set operation control pattern, a plurality of operation control patterns are set in the number control device, and the number control device It is linked to the host computer that detects the amount, etc., so that the data of the evaluation function can be fetched from the host computer etc., and the unit controller controls the power function, the number of starts and stops, the operation efficiency, the injection function, etc. An operation control pattern to be adopted is selected based on the data, and the operation of each boiler is controlled based on the selected operation control pattern.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a boiler and a number control device 2 embodying the present invention. Three steam boilers 1 are provided, and each boiler 1 is connected to a common steam header 7.
The steam generated in each boiler is collected in the steam header 7 and sent to the steam using device side, and the pressure detecting device 4 is provided in the steam header 7 which is a steam collecting portion. Each boiler 1 controls combustion at three positions of high combustion, low combustion, and stop, and adjusts the fuel supply amount and the combustion air supply amount so that high combustion produces twice as much steam as low combustion. I do. The amount of steam generated is 1 ton of the amount of steam generated by one low combustion boiler.
Assuming h, the amount of steam generated in the case of one high-burning boiler is 2 t / h, and the amount of steam generated in the case of installing three boilers is 3 t Both stages can be adjusted at intervals of 1 t / h between 6 t / h of high combustion.

The number control device 2 for controlling the number of operating boilers includes a number control panel 6 and a boiler monitoring device 5 connected to the number control panel 6. The boiler monitoring device 5 is connected to the factory host computer 3 through the LAN 8, and the number control panel 6 is connected to each of the boilers 1 and the pressure detection device 4. The factory host computer 3 also detects the amount of electric power used in the factory, and the boiler monitoring device 5
In this case, data such as the amount of power used can be taken in from the factory host computer 3 through the computer. Operation control patterns of a plurality of boilers are set in the boiler monitoring device 5. The operation control pattern is a table in which the steam pressure and the operation state of each boiler are tabulated, and FIG. 2 shows a power saving pattern and a high efficiency pattern as examples. FIG.
, H indicates that the boiler has high combustion, L indicates that the boiler has low combustion, and − indicates that the boiler should be stopped. When the steam pressure detected by the pressure detection device 4 is high, the amount of generated steam is small. When the operation state and the steam pressure are low, the operation state is such that the steam generation amount is large.

In the case of a boiler provided with an inverter in a blower for feeding combustion air into a boiler furnace, the supply of combustion air is adjusted by changing the rotation speed of the blower by the inverter. In the case of a boiler equipped with an inverter device, the power consumption during high combustion is approximately five times that during low combustion, so in order to reduce the power consumption of the boiler system, reduce the number of high combustion boilers as much as possible. It is better to increase the number of low combustion boilers. In the case of the power saving pattern, when increasing the steam generation amount, the stopped boiler is set to low combustion if there is a stopped boiler, and the low combustion boiler is set to high if there is no stopped boiler. Combustion. When reducing the amount of steam generation, if there is a high-burning boiler, the high-burning boiler is set to low combustion, and if there is no high-burning boiler, the low-burning boiler is stopped.

Since the operating efficiency of the boiler is higher during high combustion than during low combustion, in order to increase the operating efficiency of the boiler, the number of high combustion boilers is increased as much as It is better to reduce it. In the case of the high-efficiency pattern, when increasing the steam generation amount, the low-burning boiler is set to high combustion if there is a low-burning boiler, and the stopped boiler is set to low burning if there is no low-burning boiler. When reducing the amount of steam generation, if there is a low-burning boiler, the low-burning boiler is stopped, and if there is no low-burning boiler, the high-burning boiler is set to low burning.

The operation control pattern to be employed is determined by the boiler monitoring device 5, and the boiler monitoring device 5 receives data of evaluation functions such as electric energy, operation efficiency, start / stop times, and chemical injection amount taken from the factory host computer 3 or the like. Is set so that the operation control pattern is automatically changed based on. For example,
Normally, the efficiency of the boiler is kept high, and when the power consumption in the whole factory increases, the power consumption in the boiler system is reduced. It is set that a power saving pattern is adopted when the power amount is equal to or more than a predetermined value, and a high efficiency pattern is used when the power amount is less than the predetermined value.

When the data indicating that the power consumption of the entire factory has increased and the power usage detected by the factory host computer 3 has exceeded a predetermined value is sent to the boiler monitoring device 5, the boiler monitoring device 5 The operation control pattern is changed from the high-efficiency pattern to the power-saving pattern, and the unit control panel 6 controls the operation of the boiler based on the power-saving pattern, thereby reducing the power consumption in the boiler system. Also, the power consumption of the entire factory is reduced,
When the power consumption detected by the factory host computer 3 falls below a predetermined value, the boiler monitoring device 5 changes the operation control pattern from the power saving pattern to the high efficiency pattern, and the unit control panel 6 performs the operation based on the high efficiency pattern. The efficiency of the boiler is increased by controlling the operation of the boiler.

The boiler monitoring device 5 captures data of an evaluation function such as electric energy, operation efficiency, the number of times of starting and stopping, and the amount of chemical injection from the factory host computer 3 or the like, and changes the operation control pattern based on the captured data. Thus, the optimum operation control pattern can be automatically selected from a plurality of operation control patterns set in advance, and the boiler can be operated with the optimum pattern.

[0013]

According to the present invention, it is possible to control the operation of a boiler installed in multiple cans so that the boiler always has an optimum pattern.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a boiler and a number control device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a boiler operation state for each operation control pattern.

[Explanation of symbols]

1 Boiler 2 Number control device 3 Factory host computer 4 Pressure detector 5 Boiler monitoring device 6 Unit control panel 7 Steam header 8 LAN

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F22B 35/00 F23N 5/00

Claims (1)

(57) [Claims] 1. A boiler system in which a plurality of boilers are installed, wherein a pressure detecting device for detecting a steam pressure in a steam collecting portion of each boiler is provided, and an operation control in which a detected steam pressure value is set. In the boiler number control device that controls the operation of each boiler so that the operation state is determined by the pattern, the number control device has a power saving pattern and high efficiency.
In order to set multiple operation control patterns such as rate patterns and capture data of evaluation functions such as factory power consumption, the unit control device
The operation control pattern to be adopted is selected based on the data of the evaluation function such as the amount of chemical injection, and the power consumption at the factory is
If it is above, the power saving pattern is less than the predetermined value.
A high-efficiency pattern, and controlling the operation of each boiler based on the selected operation control pattern.