JP2792448B2 - Abnormal control method in boiler multi-can installation system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention is a multi-canister mounting system of the boiler, a method for controlling the time an abnormality occurs in the line or the unit count control device connecting each boiler and quantity control device.

[0002]

2. Description of the Related Art Generally, in a multi-can installation system in which a plurality of boilers are installed , a unit control method is adopted.
You. This method of controlling the number of units, for example, uses a common switch for each boiler.
Connect to the team header, to determine the state of the load by providing a pressure detector to this steam header, the number depending on the load
The control unit sequentially shifts the required number of units to combustion, and if there is a load change, the boiler is burned and stopped according to the change.
This makes it follow the load .

When the above-described method of controlling the number of boilers is applied , each boiler sets a higher pressure value for combustion control during normal operation, and sets a lower pressure value than the set pressure value by a signal from the number control device. Combustion and shutdown are forcibly performed with pressure . The reason for setting to a higher setting pressure value in the normal operation, because it uses the set pressure value as the Hi-CUT, be stopped can not be forced combustion and lower the set pressure value Therefore, it is necessary to keep the set pressure value high.

However, in the above-described method for controlling the number of boilers , each boiler and the number control device are individually connected via a line, and a combustion and stop signal is transmitted from the number control device to each boiler . If an abnormality occurs due to an unexpected accident or failure , and transmission from the unit control unit to each boiler becomes impossible, the boiler in which the abnormality has occurred is set to a higher set pressure value during combustion as described above. When the combustion is stopped, the combustion signal is not transmitted and the combustion is stopped. Therefore, it is a problem in controlling the number of units in the multi-can installation system.

[0005]

SUMMARY OF THE INVENTION This invention is to be solved
Der it challenges is that the view of the problems, to provide a control method at the time of abnormality in the multi-canister mounting system of the boiler and
You.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is provided with a plurality of boilers which are individually activated and a unit control for individually burning and stopping each of the boilers. in TACAN installation system comprising a device, when the abnormality occurs in the line or the unit count control device connecting the units control device and the boiler
The combustion controller of each boiler is set in advance increased
The set value for a certain combustion control is switched to the normal value lower than this set value, fuel for each boiler on the basis of the normal value
It is characterized by controlling baking and stopping .

[0007]

According to the present invention, when an abnormality occurs between each boiler and the number control device or in the number control device in the multi-can installation system , the combustion controller of each boiler is raised in advance. the settings for combustion control is set to, by switching to the normal value have low than this set value, on the basis of this normal value
Controls combustion and stop of each boiler .

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. Figure 1 is an explanatory view showing the arrangement of a multi-canister mounting system embodying the invention, FIG 2 is an explanatory view showing a configuration of a boiler of a multi-canister mounting system of Figure 1. Figure 1
Te, boiler 1, a plurality (No.1~No.4) Yes installed, the boiler 1, Ru respective steam pipe 16 connected to a common steam header 17 tare. A pressure sensor 18 is provided on the steam header 17 . The number control device 2 is connected to the combustion controller 3 of each boiler 1 via the line 4.
If Yes respectively connected, and the pressure sensor via a line 5
Connected to the terminal 18. And the pressure sensor 18
These detection signals are transmitted to the number control device 2 via the line 5.
It is, number controller 18, combustion in the boiler on the basis of the detection signal of the pressure sensor 18 of this, controls the stop.

In FIG. 2, each of the boilers 1 has a burner 6 for heating , and a blower 7
It is so as to deliver combustion air from. Further , a fuel supply line 8 is connected to the burner 6, and a fuel pump 9 and a fuel solenoid valve 1 are connected to the fuel supply line 8.
0 is provided. The burner 6 is provided with a flame detector 11 for detecting the presence or absence of a flame .

The combustion of each boiler 1 is controlled by a combustion controller 3 based on a signal from the number controller 2. The combustion controller 3 has a set pressure value (for example, 7 kg / cm) for combustion control which is set higher in advance in the boiler 1.
² ) is input, and from the number control device 2, a normal pressure value (for example, 5 kg / c
At m ² ), a combustion instruction is output. Then, the number control device 2 transmits the combustion and stop signals of the boilers ( No. 1 to No. 4) to the respective combustion controllers 3 based on the signal from the pressure sensor 18. In addition, each boiler 1, tare provided the water level detector 13 for detecting the water level in the reactor
Ri, based on the detection signal from the water level detector 13, as appropriate,
A water level control device (not shown) turns on / off a water supply pump 15 provided in a water supply line 14 connected to the boiler 1.
It is configured to operate and keep the water level of the boiler 1 at a constant level .

[0011] The method of abnormality in the multi cans installation system according to the present invention, disconnection or <br/> controlling the number of lines 4 for connecting the combustion control device 3 and the unit count control device 2 attached to the each boiler 1 This is a control method in a case where an abnormality occurs in a device in the device 2 and communication from the number control device 2 to each combustion controller 3 is disabled. That is, when the boiler 1 becomes unable to communicate during the combustion, the combustion controller 3 immediately releases the combustion control set pressure value which has been set higher in advance, and sets the combustion control set value lower than the set pressure value. controlling the type instead Ri off combusting the normal pressure value in the set pressure value the release. If the boiler 1 becomes unable to communicate while the combustion is stopped,
In the same manner as described above, the set pressure value is released, the normal pressure value is input as the released set pressure value, and the burner 6 is controlled based on the normal pressure value.

As described above, according to this control method, even when the control signal from the number control device 2 to each of the boilers 1 becomes uncommunicable, the operation of the combustion controllers 3 of the respective boilers 1 The boiler 1 is individually burned to supply a required amount of steam to the load side. In addition, the boiler 1 while the combustion is stopped
When communication becomes impossible, the combustion controller 3 also controls the boiler 1
Is steamed up to the normal pressure value and is on standby, so that it is possible to cope with fluctuations on the load side.

[0013] In the above embodiment has been described steam boiler, the control method of the invention can also be applied to the hot water boiler is not limited to steam boilers. That is, in the hot water boiler, the preset temperature for combustion control set in advance is automatically switched to a lower normal temperature when an abnormality occurs, and when the boiler is stopped burning, the fuel is burned to the normal temperature. After waiting.

[0014]

As described in the foregoing, the invention, when an abnormality occurs in the line or the unit count control device connecting each boiler and quantity control device, the combustion controller of the respective boiler
Is a set value for the combustion control is set in advance increased, this
Switch from the set value to the normal value have low, based on the normal value
Therefore, the combustion and stop of each boiler are controlled , so that each boiler and the number control device or the number control device are controlled.
Even if an abnormality occurs in the installation , each boiler can burn and stop based on the normal value and supply steam and hot water required for the multi-can installation system to the load side. . Further, this control method, from a preset value for combustion control is set to increase, the
Since burning instead Ri switching to the normal value lower than the set value is safe.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an arrangement of a multi-can installation system embodying the present invention.

FIG. 2 is an explanatory diagram showing a configuration of the boiler of FIG.

[Explanation of symbols]

 1 boiler 2 unit control device 4 lines

Claims (1)

(57) [Claims] 1. A multi-can installation system comprising a plurality of boilers 1 to be individually started and a number control device 2 for individually burning and stopping each of the boilers 1; when abnormality and 2 to the line 4 or the count control unit 2 connected occurs, the combustion control device 3 of the boiler 1 is previously enhanced is set to for combustion <br/> sintered control setting value the, cut to the normal value lower than the set value
Instead, based on this normal value, the combustion of each of the boilers 1
A method for controlling an abnormal time in a boiler multi-can installation system, characterized by controlling the stop .