JP2000227201A - Fuel control device of boiler equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply fuel to each boiler equally, even if the capacity characteristics of fuel flow rate adjusting valves are different, by providing a function generator which outputs a fuel flow rate setting command to a boiler master command on the basis of the data that are obtained at the time of a trial operation in the fuel control device of each boiler. SOLUTION: A function generator 9 which outputs a fuel flow rate setting command 7a to a boiler master command 6a on the basis of the data that are obtained at the time of a trial operation is provided in the fuel control device 7 of each boiler 1, so that the difference in the capacity characteristics of fuel flow rate adjusting valves 3 is corrected. For example, when the capacity characteristics of the fuel flow rate adjusting valve 3 of the boiler 1 that is located on the left is large while the capacity characteristics of the fuel flow rate adjusting valves 3 of the other two boilers 1 equal, the function is inputted to the function generator 9 corresponding to the fuel flow rate adjusting valve 3 with the large capacity characteristics on the basis of the data that is obtained at the time of the trial operation. The functions that increase or decrease the fuel flow rate setting command 7a in direct proportion to the increase or decrease in the boiler master command 6a are inputted to the other two function generators 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel control device for boiler equipment.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a boiler facility provided with boilers such as a plurality of auxiliary boilers, wherein 1 is a boiler, 2 is a burner provided in each boiler 1, and 3 is a boiler 1 for each boiler 1. A fuel flow control valve 4 for controlling the fuel flow supplied to the burner 2, a steam header 4 for connecting each boiler 1 to collect steam, and a steam pressure 5 for detecting a steam pressure 5 a in the steam header 4. A detector 6 is a group management controller that outputs a boiler master command 6a for maintaining the steam pressure 5a of the steam header 4 detected by the steam pressure detector 5 at a preset pressure target value. And a fuel flow setting command 7a based on the boiler master command 6a output from the group management controller 6
To adjust the opening of the fuel flow control valve 3.

The steam pressure 5a of the steam header 4 detected by the steam pressure detector 5 is provided inside the group management controller 6.
And a master controller 8 for obtaining a deviation from the predetermined pressure target value, performing a proportional integration process on the deviation, and outputting a signal for setting the deviation to “0” as a boiler master command 6a.

[0004] During operation of the boiler equipment shown in FIG.
The steam pressure 5a of the steam header 4 is detected by the steam pressure detector 5.
Is detected and the boiler master command 6a is output from the group management controller 6 to the fuel controller 7 of each boiler 1 so that the steam pressure 5a of the steam header 4 is maintained at the target pressure value. A fuel flow setting command 7a based on the boiler master command 6a output from the boiler 1 is output from the fuel controller 7 of each boiler 1 to the fuel flow control valve 3, and the fuel flow control valve 3
Is adjusted, the flow rate of fuel supplied to the burner 2 of each boiler 1 is adjusted, and the operating state of each boiler 1 is controlled.

[0005]

In the boiler facility as described above, a boiler master command 6a common to each boiler 1 is provided.
The opening degree of the fuel flow rate control valve 3 is adjusted by the control, but the capacity characteristics of the fuel flow rate control valve 3 of each boiler 1 are not necessarily the same due to processing accuracy and the like, and therefore, the capacity characteristics are large. If a large amount of fuel enters the boiler 1 provided with the fuel flow rate control valve 3 (see the phantom line in FIG. 3), and the steam pressure of the boiler 1 excessively rises at the time of starting or is operated in parallel with another boiler 1, However, there is a problem that an imbalance in the amount of evaporation occurs.

In view of such circumstances, the present invention can uniformly supply fuel to each boiler even when the capacity characteristics of the fuel flow control valves are different, and the steam pressure of a specific boiler rises excessively at startup. An object of the present invention is to provide a fuel control device for boiler equipment capable of preventing the occurrence of imbalance in the amount of evaporation when the fuel cell is operated in parallel with another boiler.

[0007]

SUMMARY OF THE INVENTION The present invention provides a steam pressure detector for detecting a steam pressure in a steam header to which a plurality of boilers are connected, and a steam pressure of the steam header detected by the steam pressure detector. And a group management controller for outputting a boiler master command for maintaining a preset pressure target value, and a fuel flow setting command provided for each boiler and based on the boiler master command output from the group management controller. A fuel controller for controlling the opening of the fuel flow rate control valve by outputting to a control valve, wherein a boiler master is stored in the fuel controller of each boiler based on data obtained at the time of trial operation. A fuel generator for outputting a fuel flow rate setting command in response to the command, wherein the function generator is configured to correct a difference in capacity characteristic of the fuel flow rate control valve. It relates to a control device.

According to the above means, the following effects can be obtained.

During operation of the boiler equipment, the steam pressure detector detects the steam pressure of the steam header, and the group management controller issues a boiler master command to each boiler so that the steam pressure of the steam header is maintained at the target pressure value. The fuel flow is output to the function generator of the fuel controller, and in the function generator of the fuel controller of each of the boilers, a fuel flow rate setting command based on the boiler master command output from the group management controller is obtained and sent to the fuel flow rate control valve. The output is adjusted, the opening of the fuel flow control valve is adjusted, the fuel flow supplied to each boiler is adjusted, and the operating state of each boiler is controlled.

As a result, even if the capacity characteristics of the fuel flow control valves of the respective boilers are not the same, the fuel flow supplied to the boiler provided with the fuel flow control valve having a large capacity characteristic can be suppressed. When the steam pressure of the boiler rises excessively at the time of start-up, or when the boiler is operated in parallel with another boiler, there is no need to worry about imbalance of the evaporation amount.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of an embodiment of the present invention. In the figure, portions denoted by the same reference numerals as those in FIG. 4 represent the same components, and the basic configuration is the same as that of the conventional device shown in FIG. The feature of this illustrated example is that, as shown in FIG. 1, the fuel controller 7 of each boiler 1 sets a fuel flow rate in response to a boiler master command 6a based on data obtained during a test run. A function generator 9 for outputting a command 7a is provided;
The difference lies in that the difference in the capacity characteristic of the fuel flow control valve 3 is corrected.

For example, among the three boilers 1 in FIG. 1, the capacity characteristic of the fuel flow control valve 3 of the leftmost boiler 1 is large, and the capacity of the fuel flow control valve 3 of the other two boilers 1 is large. In the case where the characteristics are equal, a function as shown in FIG. 2 is set and input to the function generator 9 corresponding to the fuel flow control valve 3 having a large capacity characteristic based on the data obtained during the test operation, and the other two are input. A function for increasing or decreasing the fuel flow rate setting command 7a may be set and input to the two function generators 9 so as to be directly proportional to the increase or decrease of the boiler master command 6a.

Next, the operation of the above illustrated example will be described.

During operation of the boiler equipment shown in FIG. 1, the steam pressure detector 5 detects the steam pressure 5a of the steam header 4 and controls the group so that the steam pressure 5a of the steam header 4 is maintained at the target pressure value. The boiler master command 6a is output from the controller 6 to the function generator 9 of the fuel controller 7 of each boiler 1, and the function generator 9 of the fuel controller 7 of each boiler 1 is output from the group management controller 6. A fuel flow setting command 7a based on the boiler master command 6a is obtained and output to the fuel flow control valve 3, the opening of the fuel flow control valve 3 is adjusted, and the fuel flow supplied to the burner 2 of each boiler 1 is adjusted. Then, the operating state of each boiler 1 is controlled.

As a result, the fuel flow control valve 3 of each boiler 1
Even if the capacity characteristics of the boiler 1 are not the same, the fuel flow supplied to the boiler 1 provided with the fuel flow control valve 3 having a large capacity characteristic is suppressed as shown by the solid line in FIG. When the steam pressure rises excessively at the time of startup or when the boiler 1 is operated in parallel with the other boiler 1, there is no need to worry about an imbalance in the amount of evaporation.

Thus, even if the capacity characteristics of the fuel flow control valve 3 are different, the fuel can be uniformly supplied to each of the boilers 1, and the steam pressure of the specific boiler 1 rises excessively at the time of startup, or other When the boiler 1 is operated in parallel, it is possible to prevent the occurrence of imbalance in the amount of evaporation.

Incidentally, the fuel control device of the boiler equipment of the present invention is not limited to the illustrated example described above, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[0019]

As described above, according to the fuel control apparatus for a boiler facility of the present invention, even if the capacity characteristics of the fuel flow control valve are different, the fuel can be uniformly supplied to each boiler. When the steam pressure of a specific boiler rises excessively at the time of start-up, or when the boiler is operated in parallel with another boiler, an excellent effect of preventing imbalance in the amount of evaporation can be prevented.

[Brief description of the drawings]

FIG. 1 is an overall schematic configuration diagram of an example of an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a function set and input to a function generator corresponding to a fuel flow control valve having a large capacity characteristic.

FIG. 3 is a diagram comparing a fuel flow rate with respect to a boiler master command between an example of the embodiment of the present invention and a conventional example.

FIG. 4 is an overall schematic configuration diagram of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 boiler 3 fuel flow control valve 4 steam header 5 steam pressure detector 5a steam pressure 6 group control controller 6a boiler master command 7 fuel controller 7a fuel flow setting command 9 function generator

Claims (1)

[Claims] 1. A steam pressure detector for detecting a steam pressure in a steam header to which a plurality of boilers are connected, and a steam pressure of the steam header detected by the steam pressure detector is set to a predetermined pressure target value. A group management controller for outputting a boiler master command for holding the boiler master command, and a fuel flow rate setting command based on the boiler master command output from the group management controller provided to each boiler and output to the fuel flow rate control valve to output the fuel flow rate In a fuel control device of a boiler facility having a fuel controller for adjusting an opening of a control valve, a fuel flow rate setting command corresponding to a boiler master command is output to a fuel controller of each boiler based on data obtained during a test run. A fuel control apparatus for a boiler facility, comprising: a function generator configured to correct a difference in capacity characteristics of a fuel flow control valve.