JPH1019246A - Air controller for combustion of combination burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air controller for combustion of a combination burner capable of supplying combustion air of a quantity suitable for the combustion of a plurality of kinds of fuel and constantly stabilizing the combustion. SOLUTION: A plurality of fuel burners 3a and 3b are provided in a burner main body 2 provided in one burner throat 1 so as to be opened. Burner valves 5a and 5b are provided in the middle of fuel supply pipes 4a and 4b for supplying different fuel A and B to the respective fuel burners 3a and 3b. A combustion air adjusting damper 7 is provided in the middle of a combustion air supply pipe 6 for supplying the combustion air to the burner main body 2. Further, a controller 8, is provided which obtains the basic opening degree command of the combustion air adjusting damper 7 based on the load request command of a boiler, multiplies the basic opening degree command by a proper gain corresponding to the opening/closing conditions of the respective burner valves 5a and 5b such as a completely closing condition, an individual, a combination and outputs the corrected opening degree command 9' of the combustion air adjusting damper 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a combustion air control device for a combination burner.

[0002]

2. Description of the Related Art Generally, a conventional burner used for a boiler or the like has a single burner throat 1 as shown in FIG.
One type of fuel burner 3 is disposed on a burner main body 2 provided so as to open at a position, and a burner valve 5 is provided in the middle of a fuel supply pipe 4 for supplying fuel to the fuel burner 3. A combustion air adjustment damper 7 is provided in the middle of a combustion air supply pipe 6 for supplying air, and a basic opening degree command 9 of the combustion air adjustment damper 7 is obtained and output based on a boiler load request command (MWD). The controller 8 has a configuration in which a controller 8 is provided.

In the case of a normal boiler, the burner throats 1 are formed in a plurality of rows in the horizontal direction of the front and rear furnace walls, and in the vertical direction of the front and rear furnace walls. A plurality of stages are formed.

[0004] As shown in FIG.
A function generator 10 is provided for obtaining and outputting a basic opening degree command 9 of the combustion air adjusting damper 7 based on the load request command.

[0005] A function as shown in FIG. 5 is input to the function generator 10, and the function is substantially proportional to the increase or decrease of the load request command.
Is increased or decreased.

In the conventional burner as described above, the basic opening command 9 of the combustion air adjusting damper 7 is obtained and output by the function generator 10 of the controller 8 based on the load request command of the boiler, and is output. The degree of opening of the combustion air adjusting damper 7 is adjusted by the degree command 9 so that an appropriate amount of combustion air is supplied from the combustion air supply pipe 6 to the burner main body 2.

[0007]

As described above, when one kind of fuel burns in one burner throat 1, the basic opening degree obtained by the function generator 10 of the controller 8 as in the prior art is used. Even if the opening degree of the combustion air adjusting damper 7 is simply adjusted by the command 9, it is possible to optimize the amount of combustion air supplied from the combustion air supply pipe 6 to the burner body 2.

However, in recent years, instead of one kind of fuel burner 3, a plurality of kinds of fuels having different properties such as gas and oil are burned in a burner body 2 provided to be opened in one burner throat 1. Install a fuel burner,
A so-called combination burner has been developed in which a plurality of types of fuels are simultaneously or separately burned simultaneously in one burner throat 1. In the case of such a combination burner, a conventional controller 8 is used.
By simply adjusting the opening of the combustion air adjusting damper 7 by the basic opening command 9 obtained by the function generator 10 of the above, an appropriate amount of combustion air is not necessarily supplied from the combustion air supply pipe 6 to the burner body 2. If the amount of combustion air is excessive, the combustion may become unstable such as an increase in NOx.

The present invention has been made in view of the above circumstances, and provides a combustion air control device for a combination burner capable of supplying combustion air in an amount suitable for combustion of a plurality of types of fuel and always stabilizing combustion. What you want to do.

[0010]

SUMMARY OF THE INVENTION The present invention provides a fuel supply system in which a plurality of types of fuel burners are arranged in a burner body provided to open in one burner throat, and different fuels are supplied to each fuel burner. Install a burner valve in the middle of the pipe,
A combustion air control device for a combination burner comprising a combustion air adjustment damper provided in the middle of a combustion air supply pipe for supplying combustion air to the burner body, the combustion air adjustment damper being based on a load request command. A function generator that obtains and outputs an opening degree command, and a gain selector that outputs an appropriate gain as a signal according to the open / close state of each burner valve such as fully closed, individual, and combination based on the open / close signal of each burner valve, A multiplier that multiplies the basic opening command output from the function generator by a gain signal output from the gain selector and outputs a corrected opening command for the combustion air adjustment damper. The present invention relates to a combustion air control device for a combination burner.

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

At the time of operation, a basic opening command of the combustion air adjusting damper is obtained in the function generator of the controller based on the load request command and output to the multiplier.

Here, when each burner valve is fully closed, the gain corresponding to the fully closed preset in the gain selector is output to the multiplier as a signal. The basic opening command output from the function generator is multiplied by a gain signal output from the gain selector to output a correction opening command for the combustion air adjustment damper. The opening degree of the combustion air adjusting damper is adjusted, and an appropriate amount of combustion air is supplied from the combustion air supply pipe to the burner main body, and the combustion air is not used for fuel combustion, but for the burner main body and the fuel burner. It is supplied for cooling.

When only one of the burner valves is individually opened, the gain corresponding to the individual preset in the gain selector is output to the multiplier as a signal. The basic opening command output from the function generator is multiplied by a gain signal output from the gain selector to output a correction opening command for the combustion air adjustment damper. The opening of the combustion air adjustment damper is adjusted, and an appropriate amount of combustion air required for combustion of the supplied individual fuel is supplied from the combustion air supply pipe to the burner body.

Further, when a plurality of types of fuel burner valves are opened in combination, a gain corresponding to the combination preset in the gain selector is output to the multiplier as a signal, and A basic opening command output from the function generator is multiplied by a gain signal output from the gain selector to output a correction opening command for the combustion air adjustment damper. The opening degree of the combustion air adjustment damper is adjusted according to the command, and an appropriate amount of combustion air required for simultaneous combustion of the combined fuels is supplied from the combustion air supply pipe to the burner body.

[0016]

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

FIGS. 1 and 2 show an example of an embodiment of the present invention. In the drawings, portions denoted by the same reference numerals as those in FIGS. 3 to 5 represent the same components, and one burner throat 1 A plurality of types (two types in the example in the figure) of fuel burners 3a and 3b are arranged in a burner main body 2 provided so as to be opened at a position, and different fuels A and B are supplied to the respective fuel burners 3a and 3b. Burner valves 5a, 5b in the supply pipes 4a, 4b
Is provided.

In the controller 8, each burner valve 5a, 5
b, a gain selector 12 which outputs an appropriate gain as a signal 26 in accordance with the open / close state of each burner valve 5a, 5b such as fully closed, individual, or combination based on the open / close signals 11a, 11b.
And a gain signal 2 output from the gain selector 12 with respect to the basic opening degree command 9 output from the function generator 10.
6 multiplied by 6 and the correction opening command 9 'of the combustion air adjustment damper 7
And a multiplier 13 that outputs the same.

As shown in FIG. 2, the gain selector 12 includes a fully-closed gain setter 15 for presetting a gain 14 when all the burner valves 5a and 5b are closed, and a fuel A
When the burner valve 5a of the fuel A is open, the gain 16 from the individual gain setter 17 is set to a signal 18. While fuel A
When the burner valve 5a is closed, the switching relay 19 that outputs the gain 14 from the fully-closed gain setting device 15 as a signal 18 and the gain 20 when only the burner valve 5b of the fuel B is open are set in advance. Individual gain setting device 2 to be set
1 and the gain 20 from the individual gain setting unit 21 is output as a signal 22 when the fuel B burner valve 5b is open, while the switching relay is output when the fuel B burner valve 5b is closed. The switching relay 23 that outputs the signal 18 from the signal 19 as a signal 22 and the gain 2 when the burner valves 5a and 5b of the fuels A and B are opened in combination.
4, a combination gain setter 25 for setting fuel 4 in advance.
When the burner valves 5a and 5b of B are open, the gain 24 from the combination gain setter 25 is output as a signal 26. On the other hand, when the burner valves 5a and 5b of fuels A and B are closed. A switching relay 27 that outputs the signal 22 from the switching relay 23 as a signal 26 is provided.

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

During operation, the basic opening command 9 of the combustion air adjusting damper 7 is obtained by the function generator 10 of the controller 8 based on the load request command of the boiler, and is output to the multiplier 13.

When the burner valves 5a and 5b are all closed, the fully closed gain setting unit 1 of the gain selector 12
The gain 14 preset at 5 is transmitted from the switching relay 27 to the signal 26 via the switching relay 19 and the switching relay 23.
The basic opening degree command 9 output from the function generator 10 is output to the multiplier 13 as
Is multiplied by a gain signal 26 output from the switching relay 27 of the gain selector 12 to output a correction opening command 9 'for the combustion air adjusting damper 7, and the correction opening command 9' The opening of the air adjustment damper 7 is adjusted,
An appropriate amount of combustion air is supplied from the combustion air supply pipe 6 to the burner body 2.

In this case, the combustion air is supplied not for combustion of the fuel but for cooling the burner body 2 and the fuel burners 3a and 3b.

When only the burner valve 5a for fuel A is open and the burner valve 5b for fuel B is closed, the gain 16 preset in the individual gain setting unit 17 of the gain selector 12 is switched to the switching relay. 19 and a signal 26 from the switching relay 27 via the switching relay 23 to the multiplier 13. The multiplier 13 responds to the basic opening degree command 9 output from the function generator 10 by the gain selector. 1
2 is multiplied by a gain signal 26 output from the switching relay 27 of FIG.
The opening of the combustion air adjusting damper 7 is adjusted by the corrected opening command 9 ′, and an appropriate amount of combustion air required for combustion of the fuel A is supplied from the combustion air supply pipe 6 to the burner main body. 2.

When only the burner valve 5b for fuel B is open and the burner valve 5a for fuel A is closed, the gain 20 preset in the individual gain setting unit 21 of the gain selector 12 is switched to the switching relay. 23, the signal is output from the switching relay 27 to the multiplier 13 as a signal 26.
3, the switching relay 27 of the gain selector 12 responds to the basic opening command 9 output from the function generator 10.
Is multiplied by the gain signal 26 output from the controller, a correction opening command 9 'for the combustion air adjustment damper 7 is output, and the opening of the combustion air adjustment damper 7 is adjusted by the correction opening command 9'. An appropriate amount of combustion air required for combustion of the fuel B is supplied from the combustion air supply pipe 6 to the burner body 2.

Further, when the burner valve 5a for the fuel A and the burner valve 5b for the fuel B are open together, the gain 24 set in the combination gain setting unit 25 of the gain selector 12 is set in advance. Is the signal 2 from the switching relay 27
6 is output to the multiplier 13. In the multiplier 13, a gain signal 26 output from the switching relay 27 of the gain selector 12 in response to the basic opening degree command 9 output from the function generator 10 is output. The correction opening command 9 'of the combustion air adjustment damper 7 is output, and the opening of the combustion air adjustment damper 7 is adjusted by the correction opening command 9' so that the fuel A and the fuel B are simultaneously burned. A necessary and appropriate amount of combustion air is supplied from the combustion air supply pipe 6 to the burner body 2.

In this way, a suitable amount of combustion air can be supplied for the combustion of a plurality of types of fuels A and B, and the combustion can always be stabilized.

It should be noted that the combustion air control device for a combination burner of the present invention is not limited to the above-described illustrated example, and the number of types of fuel is not limited to two but may be three or more. Needless to say, various changes can be made without departing from the gist of the present invention, such as setting the gain in advance according to the open / close state of each burner valve such as closed, individual, and combination.

[0029]

As described above, according to the combustion air control apparatus for a combination burner according to the present invention, it is possible to supply a suitable amount of combustion air for the combustion of a plurality of types of fuels and to always stabilize the combustion. An excellent effect can be achieved.

[Brief description of the drawings]

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

FIG. 2 is a detailed diagram of a controller according to an example of an embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a conventional example.

FIG. 4 is a detailed view of a controller in a conventional example.

FIG. 5 is a diagram showing a function set in the function generator shown in FIGS. 2 and 4;

[Explanation of symbols]

 Reference Signs List 1 burner throat 2 burner body 3a fuel burner 3b fuel burner 4a fuel supply pipe 4b fuel supply pipe 5a burner valve 5b burner valve 6 combustion air supply pipe 7 combustion air adjustment damper 8 controller 9 basic opening command 9 'correction opening Degree command 10 Function generator 11a Open / close signal 11b Open / close signal 12 Gain selector 13 Multiplier 14 Gain 15 Fully closed gain setting device 16 Gain 17 Individual gain setting device 20 Gain 21 Individual gain setting device 24 Gain 25 Combination gain setting device 26 Signal

Claims (1)

[Claims] A plurality of fuel burners are provided on a burner body provided to open to one burner throat, and a burner valve is provided in a fuel supply pipe for supplying different fuels to each fuel burner; What is claimed is: 1. A combustion air control device for a combination burner, comprising a combustion air adjustment damper provided in the middle of a combustion air supply pipe for supplying combustion air to the burner main body, the combustion air adjustment damper being based on a load request command. A function generator that obtains and outputs an opening degree command, and a gain selector that outputs an appropriate gain as a signal according to the open / close state of each burner valve such as fully closed, individual, and combination based on the open / close signal of each burner valve, Multiplying a basic opening command output from the function generator by a gain signal output from the gain selector to output a correction opening command for the combustion air adjustment damper Combustion air control device combination burner, characterized in that it comprises a control unit and a that multiplier.