JP3189084B2 - Burner number control circuit and steam generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner number control circuit such as an automatic burner control device for a boiler for generating steam.
In particular, the present invention relates to a burner number control circuit that can easily change the burner ignition sequence and fire extinguishing sequence, and a steam generator including the burner number control circuit.

[0002]

2. Description of the Related Art In a boiler having a plurality of burners, for example, for generating steam, the number of burners to be used is changed in accordance with a change in load. Whether a combination (burner pattern) of burners is used has a great effect on main steam temperature control, denitration control, and the like. Operation of the combustion apparatus with an inappropriate burner pattern causes a temperature difference between the superheater and the reheater and a temperature difference between the front, rear, left and right of the furnace, and the main steam temperature fluctuates, thereby lowering the boiler efficiency. If the burner ignition state (combination of combustion burners) in the vertical direction is inappropriate, the NOx reduction effect by in-furnace denitration control or the like will be low, causing a problem that the NOX value cannot be suppressed.

FIG. 9 shows an example of a burner ignition / extinguishing pattern when the load is 25%, 50%, 75% and 100%, and the NOX value corresponding to this burner pattern is shown in FIG. The temperatures are shown in FIG. In this case, when the load state is about 50%, the number of burners ignited before and after the furnace and right and left is unbalanced, which induces a temperature difference between before and after the furnace and left and right.
As shown in (1), the main steam temperature fluctuates and the boiler efficiency decreases. Also, due to the misalignment of the ignited burners in the vertical direction from the first stage to the third stage, NO
As shown in FIG. 10, the X reduction effect is reduced, and N
The state can be said to be unable to suppress the OX value.

On the other hand, in the burner pattern shown in FIG. 6, the arrangement of the ignited burners is balanced in front of the can, after the can, on the left of the can, and on the right of the can in the full load zone, so that an appropriate burner is provided. The behavior of the NOX value and the main steam temperature at this time is an appropriate value as shown in FIGS.

[0005] The burner pattern is determined for the entire range of the load.
The change of the burner ignition / extinguishing pattern including the control of the number of burners to optimize the burner pattern was performed by directly rewriting the contents of the fixed computer program by a maintenance tool which is hardware for correcting the program.

Since the computer program is directly rewritten, it is necessary to change the burner ignition sequence and the fire extinguishing sequence while the computer program is stopped (off-line).

In the prior art shown in FIG. 5, a number control ON command 21 and a number control OFF command 22 are input to a flip-flop 24, and the output of the flip-flop 24 becomes a number control ON command signal 25. This number control input command signal 2
5 and the burner increase command 23 when the number is controlled
0, the output of the AND operator 20 and F-
The inverted signal of the 1-burner ignition bypass signal 1a in the NOT operation unit 53a is input to the AND operation unit 52a. The operation result of the AND operation unit 52a is the F-1 burner ignition command 2a.
Is output as F-1 burner ignition bypass signal 1a
Is a signal that is established when the F-1 burner is in an abnormal state and cannot be ignited or when ignition has already been completed. The F-1 burner ignition bypass signal 1a and the output of the AND operator 20 are Is further input to the AND operator 51a. When the F-1 burner ignition bypass signal 1a and the output of the AND operator 20 are both established, the F-1 burner ignition completion 3a is established as the output of the AND operator 51a.

As in the case of the F-1 burner ignition command 2a, the F-2 burner ignition command 2b is obtained by inverting the F-2 burner ignition bypass signal 1b in the negative calculator 53b and the F-1 burner ignition completion 3a. Is input to the AND operator 52b, and is output according to the operation result of the AND operator 52b. F
-3 or later burner (F-3 to F-16 burner, R-1 to
R-16 burner) is sequentially output by the same calculation. Also, the fire extinguishing command signal of each burner is sequentially output by the same calculation as the ignition command signal.

That is, in the case of this prior art, the F-1 burner ignition command 2a is first output in accordance with the burner increase command 23 during the number control, the F-1 burner enters the ignition operation, and the F-1 burner starts. Is completed, F-1 burner ignition completion 3a is established, and then the F-2 burner ignition command 2b is output. Therefore, the burner ignition commands 2a to 2n receive the calculation result of the computer program, and Output in order to the right.

For this reason, in order to change the firing order of the burners, for example, the firing order of the F-1 burner and the F-2 burner is changed so that the F-2 burner is used as the first burner,
In order to change the ignition so that the second burner is ignited, the logical product operator 52a and the negative operator 53a constituting the F-1 burner ignition command 2a and the F-1 burner ignition completion 3a are constituted. The program formed by the AND operator 51a and the F-1 burner ignition bypass signal 1a is
AND operator 52 constituting 2-burner ignition command 2b
It is necessary to replace the program with the logical product calculator 51b and the F-2 burner ignition bypass signal 1b which constitute the negative operator 53b and the F-2 burner ignition completion 3b. In order to directly rewrite the computer program, the computer program must be stopped. Therefore, the only way to change the burner ignition / extinguishing order is to directly rewrite the fixed burner number control program. It is necessary to change the burner ignition command, fire extinguishing command, and bypass signal. And the time and cost required for the change, the boiler must be shut down for the change.

[0011]

In the above prior art, when changing the burner pattern, there is only a method of directly rewriting the computer program. Therefore, if the details of the program are not understood, the burner pattern can be changed. could not. Further, since a long time is required for the change, the combustion device must be stopped, and the burner pattern is operated with an inappropriate burner pattern until the stop time comes, which adversely affects the boiler efficiency and the NOx reduction rate. there were.

An object of the present invention is to enable quick and easy handling of a burner pattern change request.

[0013]

SUMMARY OF THE INVENTION An object of the present invention is to provide a burner number control circuit that sequentially ignites a plurality of burners in accordance with a computer program and sequentially extinguishes the fires. A count circuit that outputs a signal indicating the number of ignition completion burners output from the count circuit. Select the burner to be
This is achieved by outputting a signal instructing ignition of the burner.

Another object of the present invention is to provide a burner number control circuit that sequentially ignites a plurality of burners according to a computer program and sequentially extinguishes the fire, counts the number of burners that have completed ignition, and outputs a signal indicating the number of burners that have completed ignition. A counting circuit, and a setting circuit for setting an ignition order and a fire extinguishing order for each burner, wherein data indicating the ignition order and the fire extinguishing order set in the setting circuit are stored in a data area of the memory which is not protected. It is also achieved by doing

Instead of counting the number of burners whose ignition has been completed, the burners are divided into a plurality of burner groups each composed of one or more burners which are ignited at the same timing. The setting circuit shall set the ignition order and the fire extinguishing order for each burner group, and the setting circuit shall set the ignition completion number output by the counting circuit. A signal indicating the number of burner groups may be input, a burner group to be ignited next may be selected, and a signal instructing ignition of a burner belonging to the burner group may be output. In this case, data defining the ignition order and the fire extinguishing order for each burner group set in the setting circuit is stored in a rewritable data area of the memory which is not protected.

The above object also includes a furnace having a plurality of burners, a pipeline for generating steam by heat generated by the burning of the burners, and a combustion control device for controlling the burning of the plurality of burners. In the steam generator, the combustion control device is achieved by including the burner number control circuit according to any one of claims 1 to 7.

[0017]

The counting circuit counts the number of burners or the number of burner groups for which ignition has been completed, and outputs the number of burners or the number of ignition completion burner groups to the setting circuit. In the setting circuit, sequence setting value data defining the ignition sequence and the fire extinguishing sequence for each burner or burner group is set in a format that can be compared with the number of burners or the number of burner groups for which ignition has been completed, and is input. A burner or a burner group to be ignited or extinguished next is selected based on the number of completed burners or the number of completed burner groups by comparing the sequence set value data. Next, the setting circuit outputs a signal instructing ignition or extinguishing of the selected burner or the burners belonging to the selected burner group. The order setting value data that defines the ignition order and the fire extinguishing order set in the setting circuit is stored as a set value signal in a rewritable data area that is not protected in the memory, and is stored during the operation of the program. Can also be changed.

Therefore, even when the steam generator is in operation, the burner pattern for increasing or decreasing the number of combustion burners can be easily changed.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to a boiler for supplying steam to a power generating steam turbine. The boiler has a furnace with a plurality of burners, a pipeline that is heated by the heat generated by the combustion of the burners to generate steam, and an automatic control device that controls various devices of the boiler to exhibit desired performance. The automatic control device is configured to include a combustion control device. Combustion control includes an increase or decrease in the number of combustion burners due to a change in load, and an increase or decrease in the number of combustion burners at start and stop.The increase or decrease in the number of combustion burners controls the number of burners that forms part of the combustion control device. It is controlled by a circuit. Hereinafter, a burner number control circuit for controlling the number of combustion burners of a boiler as such a steam generator will be described as an example. Illustration of the boiler main body is omitted.

F-1 to 16 and R-1 to 1 are installed in the furnace of the boiler.
6, 32 burners are provided, and these burners are ignited in this order as an example, and will be described with reference to FIGS. F-1 to 16 are burners arranged in four steps vertically on the front surface of the boiler furnace, and R-1 to 16 are four steps vertically formed on the rear surface of the boiler furnace.
Burners arranged opposite to each other are shown.

FIG. 1 shows a burner number control circuit according to an embodiment of the present invention. The burner number control circuit is connected to a burner ignition / extinction command transmission circuit 101 and the burner ignition / extinction command transmission circuit 101. The ignition completion burner number counting circuit 102 and the burner ignition / extinguishing command transmission circuit 10
1 and a burner ignition / extinguishing sequence setting circuit 103 connected to the ignition completion burner number counting circuit 102.

The burner ignition / extinguishing command transmission circuit 101
A flip-flop 24 to which a number control input command 21 and a number control off command 22 are input, an AND operator 20 to which the output of the flip-flop 24 and the number control burner increase command 23 are input; AND operator 54a which receives the output and the F-1 burner firing order setting signal 4a as inputs
And an N-1 arithmetic unit 53a to which the F-1 burner ignition bypass signal 1a is input, and an F-1 burner ignition command 2 to which the output of the logical product arithmetic unit 54a and the output of the negation arithmetic unit 53a are input.
a logical product operator 52a that outputs a and a logical product operator 5
4a and an F-1 burner ignition bypass signal 1a as inputs and an AND operator 51a which outputs F-1 burner ignition completion 3a as an output; an output of the AND operator 20 and an F-2 burner ignition order setting signal 4b AND operator 54b which receives
And an N-2 arithmetic operation unit 53b to which the F-2 burner ignition bypass signal 1b is input, and an F-2 burner ignition instruction 2 to which the output of the AND operation unit 54b and the output of the negation operation unit 53b are input.
AND operator 52b which outputs b as an output, and AND operator 5
4b and an F-2 burner ignition bypass signal 1b as inputs and an AND operator 51b which outputs F-2 burner ignition completion 3b as an output.
-3 to R-16 burner firing order setting signals 4c to 4n as inputs, AND operator 54c to n, and F-3 to R-16
Negation operators 53c-n to which burner ignition bypass signals 1c-n are input, and outputs of AND operation units 54c-n and outputs of negation operation units 53c-n are input to F-3 to R-16.
AND operator 52 that outputs burner ignition commands 2c to n
c to n, the outputs of the AND operator 54c to n, and F-3 to R
-16 burner ignition bypass signals 1c-n are input and F-
AND calculators 51c to 51n that output 3 to R-16 burner ignition completions 3c to n, respectively. FIG.
FIG. 2 is a diagram showing an internal configuration of a burner ignition / extinguishing command transmission circuit 101 of FIG.

Ignition completion burner number counting circuit 102
The signal generator 26 outputs a signal of 10% as a signal for counting the completion of ignition, the signal generator 27 outputs a signal of 0% as a signal for counting of non-ignition, and the output of the signal generator 26 is A plurality of analog switches 11 each having an input to which the output of the signal generator 27 is input to a second input
a, 11b, 11c to 11n, and the analog switch 11
a, 11b, and 11c to 11n. The outputs of the adder 29, which totals and outputs all the outputs of the analog switches 11a, 11b, and 11c to 11n, are provided. This is an output signal of the burner ignition completion number counting circuit 102. Each analog switch 1
The three input signals of a first input, a second input, and a switch input are input to 1a to 1n, and the first input and the second input receive the output of the signal generator 26 as described above. When the switch input is on, the first input is output from the analog switch as it is, and when the switch input is off, the second input is output from the analog switch as it is. I have. The switch input of the analog switch 11a is the output side of the AND operator 51a, the switch input of the analog switch 11b is the output side of the AND operator 51b, and the switch inputs of the analog switches 11c to 11n are the logical product. The output sides of the computing units 51c to 51n are connected to each other. FIG. 3 shows details of the ignition completion burner number counting circuit 102 of FIG.

The burner ignition / extinguishing sequence setting circuit 103
Monitor relay 13a corresponding to F-1 burner, monitor relay 13b corresponding to F-2 burner, F-3 to R-16
It is configured to include monitor relays 13c to 13n corresponding to burners, and the output of the adder 29 is input to each monitor relay as the output of the count circuit 102. The output side of the monitor relay 13a is connected to one of the input sides of the AND operator 54a, the output side of the monitor relay 13b is connected to one of the input sides of the AND operator 54b, and the output sides of the monitor relays 13c to 13n. Is the AND operator 54c
To n on the input side. FIG.
1 shows details of the burner ignition / extinguishing sequence setting circuit 103 of FIG.

The operation of the circuit having the above configuration will be described below.

In the burner ignition / extinguishing command transmission circuit 101, when the number control ON command 21 and the number control OFF command 22 are input to the flip-flop 24,
Outputs the number control input command signal 25. The signal obtained by multiplying this signal with the burner increase command 23 during the number control by the logical product calculator 20 is given to the calculation program of each burner. That is, for the F-1 burner, the output signal of the AND operator 20 and the F-1 burner firing order setting signal 4a are input to the AND operator 54a, and the output of the AND operator 54a is output to the AND operator. 52a. On the other hand, the F-1 burner ignition bypass signal 1a is
After being inverted in 3a, it is input to the AND operator 52a,
The output of the AND operator 52a is the F-1 burner ignition command 2a
Becomes Here, the F-1 burner ignition order setting signal 4a is
This is an output signal of the monitor relay 13a corresponding to the F-1 burner of the burner ignition / extinguishing sequence setting circuit 103.
The burner ignition bypass signal 1a is a signal that is established when the F-1 burner is in an abnormal state and cannot be ignited or when ignition has already been completed. F-1 burner ignition completed 3
a is the result of the AND operation of the output signal of the AND operation unit 54a and the F-1 burner ignition bypass signal 1a in the AND operation unit 51a. This signal is supplied to the F-1 burner of the ignition completion burner number counting circuit 102. Supported analog switches 11
a is provided as a switch input. The F-2 burner firing command 2b is calculated by the logical product calculator 54b of the output signal of the logical product calculator 20 and the F-2 burner firing order setting signal 4b similarly to the case of the F-1 burner firing command 2a. Results and
Negative operator 53b of F-2 burner ignition bypass signal 1b
Is output according to the operation result of the logical AND operation unit 52b with the operation result of. Burner after F-3 (F-3 to F-1)
6, R-1 to R-16 burners) are sequentially output by the same calculation. Therefore, the output timing of the burner (n-th burner) ignition command 2n is the immediately preceding burner (n-1th burner) ignition completion 3
Burner concerned (nth burner) without being involved in n-1
It is determined by the ignition order setting signal 4n. Note that the fire extinguishing command signal of each burner is also sequentially output by the same calculation as the ignition command signal.

The signal generator 26 of the burner ignition completion number counting circuit 102 outputs 10 as an ignition completion count signal.
%, And the signal generator 27 outputs a signal of 0% as a signal for counting the number of non-firings. This signal is used as the first input and the second input of the analog switch corresponding to each burner group.
Each is entered in the input. The analog switch 11a of the F-1 burner selects the output signal of the signal generator 26 which is the first input when the ignition is completed (switch input signal ON) according to the switch input state of the F-1 burner ignition completion 3a, and outputs a 10% signal. Is output and no ignition (switch input signal OF
In F), the output signal of the signal generator 27, which is the second input, is selected to output a 0% signal. The adder 28 inputs the output signals of the F-1 burner analog switch 11a and the F-2 burner analog switch 11b and outputs the result of addition. Therefore, the output signal of the adder 28 becomes 20% when both the F-1 and F-2 burners are completely ignited, 10% when one of the two burners is completely ignited, and 0% when both of them are not ignited.
Becomes The adder 29 similarly performs the above operation on the 32 burners F-1 to F-16 and R-1 to R-16 and outputs the outputs of the analog switches 11a to 11n corresponding to the burners. As a result of adding the signals,
The adder 29 outputs a signal of 0 to 320% in accordance with the number of burners 0 to 32 for ignition completion.

The burner ignition / extinguishing sequence circuit 103 is provided with monitor relays 13a to 13n corresponding to the respective burners, and each of them receives a burner ignition completion number signal 30 which is an output signal of the adder 29. The F-1 burner ignition order set value 14a is assigned to the monitor relay 13a of the F-1 burner, and the ignition order set value data is stored in%. F-1 burner monitor relay 1
3a is the input signal of the burner ignition completion number signal 30 and F
By comparing the data with the -1 burner ignition order setting value 14a, the F-1 burner ignition order setting signal 4a, which is the output signal when the input signal (burner ignition completion number signal) 30≥the ignition order setting value 14a, is satisfied. Set to ON. For the ignition order setting signals 4b to 4n of the burners after F-2 (F-2 to F-16 burners, R-1 to R-16 burners), ON and OFF of the output signals are determined by the same calculation. The monitor relay set value Xn of the nth burner in the ignition order is given by the following equation.

Xn = 10 × (n−1) −2 n: ignition order The monitor relay set value is set value data stored in an unprotected area of the memory, that is, a rewritable data area. Therefore, the set value can be changed whether the computer program is operating (online) or stopped (offline).

In FIG. 4, the set values 14a to 14n of the monitor relay described as the example 1 are as follows: the first ignition sequence is the F-1 burner, the second is the F-2 burner, and the 32nd is the R-1 burner.
This is an example in the case of 6 burners. Example 2 is an example in which the firing order of the F-1 burner is 10th, the firing sequence of the F-2 burner is 3rd, and the firing sequence of the R-16 burner is 20th. In the case of Example 2, for example, if the ignition of two burners R-10 and F-10 has been completed, the burner ignition completion number signal 30 becomes a signal of 20%, which is 18% of the F-2 burner ignition order set value 15b. F-2 burner monitor relay 13b determines that the
A two burner ignition order setting signal 4b is output. The output of the AND operator 54b is established by the output of the AND operator 20 and the F-2 burner firing order setting signal 4b. At this time, F-
Since the 2 burner is not fired, the F-2 burner ignition bypass signal 1b is OFF, and the output of the negative operator 53b is ON.
As a result, the F-2 burner ignition command 2b, which is the output of the AND operator 52b, is established. Upon receiving the output of the F-2 burner ignition command 2b, the F-2 burner enters the ignition operation and completes the ignition. When the F-2 burner ignition bypass signal 1b is established, the F-2 burner is activated.
The 2-burner ignition command 2b is turned OFF, and at the same time, the F-2 burner ignition completion 3b is established. F-2 burner ignition completed 3
When b is turned on, the output of the analog switch 11b becomes 10%, and the output of the adder 29 becomes 20% to 30%.
Changes to Next, for example, R-11, R-12, R-1
When the six burners 3, F-11, F-12, and F-13 are completely ignited, nine burners including the three burners R-10, F-10, and F-2 are in an ignition completed state, and The ignition completion number signal 30 becomes 90%, which exceeds 88% of the F-1 burner ignition order set value 15a. This is determined by the F-1 burner monitor relay 13a, and the F-1 burner ignition order setting signal 4a is output. F-1 burner ignition command 2a is F-
As in the case of the two-burner, it is turned ON / OFF according to the operation results of the AND operation units 54a and 52a and the negation operation unit 53a.

According to the present embodiment, the burner ignition sequence is determined by the set value data assigned to the monitor relay corresponding to each burner, so that the set value data can be set online without directly rewriting the computer program itself. It is possible to change the burner ignition order by changing the burner pattern, so that the burner pattern can be easily and quickly optimized.

In the above embodiment, the ignition sequence is set for each burner. However, the burners may be divided into a plurality of burner groups each including one or more burners, and the ignition sequence may be set for each group. . In this case, the F-1 burner ignition bypass signal 1a is a signal that is satisfied when all the burners belonging to the F-1 burner group are ignited, and the F-1 burner ignition completion 3a is a signal indicating that the F-1 burner group ignition is completed. The F-1 burner ignition command 2a may be output to all burners belonging to the F-1 burner group.

In the above-described embodiment, the case where the number of burners to be ignited (burners to be burned) is sequentially increased is described. However, the case where the number of burners to be burned is sequentially reduced is the same idea as in the case of ignition. What is necessary is just to comprise a circuit.

Next, a case where the set ignition order is changed will be described. As described above, the ignition order is defined by the ignition order set value data set in the monitor relays 13a to 13n. To change the firing order,
What is necessary is just to change the ignition order set value data set in the monitor relays 13a to 13n. For example, in Example 1 of FIG.
The -1 burner is ignited first, and then the F-2 burner is ignited. If the burner is reversed, the ignition sequence set value of the monitor relay 13a is rewritten from -2% to 8%. , The ignition sequence set value of the monitor relay 13b may be rewritten from 8% to -2%. Since the ignition order set value is set as data in an unprotected area of the memory and in a rewritable data area, even during the operation of the program, the control order provided in the combustion control device or the like is used. It can be easily changed via a keyboard or the like.

By configuring the number-of-burners control circuit forming a part of the combustion control device of the boiler as described in the above embodiment, the burner pattern can be easily changed during the operation of the boiler, and the number of combustion burners can be reduced. It becomes easy to suppress the fluctuation of the main steam temperature when increasing and decreasing, and at the same time it becomes easy to suppress the increase in NOX when increasing and decreasing the number of combustion burners.

[0036]

According to the present invention, there is provided a burner number control circuit including a circuit for setting a burner ignition sequence and a fire extinguishing sequence and a count circuit for counting the number of burners for which ignition has been completed. By stopping the program and changing the set value data online without directly rewriting the program, it is possible to change the ignition / extinguishing order and easily and quickly correct the burner pattern. This has the effect of realizing combustion in a burner pattern to maintain an appropriate main steam temperature and appropriately maintaining NOX control.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a part of the embodiment of FIG. 1;

FIG. 3 is a diagram showing a part of the embodiment of FIG. 1;

FIG. 4 is a diagram showing a part of the embodiment of FIG. 1;

FIG. 5 is a diagram showing an example of the related art.

FIG. 6 is a graph showing an example of an appropriate burner pattern corresponding to a load.

FIG. 7 shows NO corresponding to the burner pattern shown in FIG.
It is a graph which shows the example of the behavior of X value.

8 is a graph showing an example of the behavior of the main steam temperature corresponding to the burner pattern shown in FIG.

FIG. 9 is a graph showing an example of an inappropriate burner pattern.

FIG. 10 shows N corresponding to the burner pattern shown in FIG. 9;
It is a graph which shows the example of the behavior of OX value.

11 is a graph showing an example of the behavior of the main steam temperature corresponding to the burner pattern shown in FIG.

[Explanation of symbols]

1a-n Burner ignition bypass signal 2a-n Burner ignition command 3a-n Burner ignition completed 4a-n Burner ignition sequence setting signal 11a-n Analog switch 13a-n
Monitor relays 14a-n Burner ignition sequence set values 15a-n
Burner firing order set value 20 AND operator 21 Number control ON command 22 Number control OFF command 23 Burner increase command during number control 24 Flip-flop 25 Number control ON command signal 26 Ignition count signal generator 27 Non-ignition count signal Generator 28, 29 Adder 30 Burner ignition completion number signal 51a-n Logical product operator 52a-n
AND operator 53a-n Negative operator 54a-n
AND operator 101 Burner ignition / extinguishing command transmission circuit 102 Burner ignition completion number counting circuit 103 Burner ignition / extinguishing order setting circuit

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor ▲ Yoshi ▼ Teruaki Tadashi 3-2-1 Sachimachi, Hitachi City, Ibaraki Prefecture Within Hitachi Engineering Co., Ltd. (72) Yoshinori Murakami 5-chome Omikacho, Hitachi City, Ibaraki Prefecture No. 1 Hitachi, Ltd. Omika Plant (56) References JP-A-1-102213 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 5/00

Claims (6)

(57) [Claims] 1. A burner number control circuit for sequentially igniting a plurality of burners in accordance with a computer program and sequentially extinguishing a fire, a count circuit for counting the number of burners for which ignition has been completed and outputting a signal indicating the number of burners for which ignition has been completed; Ba
And a setting circuit for setting the number of ignition or extinguishment for each burner.
The point where prescribed data is input from the count circuit
A form that can be compared with the data indicating the number of burners that have been fired
It is set for each burner by the formula,
Data indicating the number of ignition completion burners input from the
The data that has been set for each
Burner set to a value smaller than the specified data
And outputting a signal instructing ignition or extinguishing of the selected burner. 2. What number is set in the setting circuit for each burner
2. The burner number control circuit according to claim 1, wherein data defining whether the ignition or extinguishing is performed is stored in an unprotected data area of a memory. 3. A burner number control circuit that sequentially ignites a plurality of burners according to a computer program and sequentially extinguishes the fire by counting the number of fired groups for each burner group including one or more burners and counting the number of burned groups. a count circuit for outputting a signal indicating the number of groups, Ba
Each bar determines the number of fires or fires
And a setting circuit for setting each burner group.
Data that specifies whether the counting is performed from the counting circuit.
Data indicating the number of burner groups that have been ignited
Is set for each burner group in a format that can be compared with the
And an ignition completion burner input from the counting circuit.
Data indicating the number of groups and the settings for each burner group
The specified data is compared, and the input data is compared.
Burner group with a smaller value than the
A burner number control circuit for selecting and outputting a signal instructing ignition of a selected burner group . 4. A burner group set in a setting circuit
4. The burner number control circuit according to claim 3 , wherein data indicating whether the ignition or extinguishment is performed at the first time is stored in a data area of the memory which is not protected. 5. A setting circuit for arbitrarily selecting a burner or a burner group regardless of whether a computer program is in an operating state (online) or in a stopped state (offline).
The burner number control circuit according to any one of claims 1 to 4 , wherein the circuit is capable of setting the number of ignition or extinguishing . 6. A steam generator, comprising: a furnace having a plurality of burners; a pipeline for generating steam by heat generated by burning of the burners; and a combustion control device for controlling combustion of the plurality of burners. The steam generator according to any one of claims 1 to 5 , wherein the combustion control device includes the burner number control circuit according to any one of claims 1 to 5 .