JP3146441B2 - Combustion device control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for a combustion apparatus, and more particularly to a control method for a combustion apparatus using a gas burner.

[0002]

2. Description of the Related Art FIG. 3 is a layout view of burners in a combustion apparatus, FIG. 4 is a perspective view of a starting burner, FIG. 5 is a perspective view of a main burner, FIG. 6 is a view showing a relationship between plant load and burner header pressure. FIG. 7 is a flowchart of burner ignition and fire extinguishing in the conventional method.

FIG. 3 shows a state in which various burners are arranged on a front wall and a rear wall of a boiler, respectively, wherein 1 is a starter burner, 2 is a main burner, and 3 is an ignition burner. The serial numbers given to the start-up burner 1 and the main burner 2 are as follows:
The burner numbers shown in FIG.

FIG. 4 shows a two-part, burner-cut type start-up burner. In FIG. 4 and FIG.
Is a burner gas ring, 5 is a gas element, 6 is a burner cut valve, and 7 is a burner main valve.

In the conventional burner operation, the startup burner 1 shown in FIGS. 3 and 4 is used when the power plant is started. By opening and closing the burner cut valve of the starter burner 1, two-stage gas flow control is possible, and a sudden change in the pressure, temperature, etc. of the plant is suppressed. When the ignition of the starting burners 1 of the burner numbers (1) to (4) shown in FIG. 3 is completed, the main burner 2 is sequentially ignited because the heat load of the boiler furnace becomes substantially uniform.

FIG. 6 shows plant load-burner header pressure characteristics in relation to the number of burners. As shown in the figure, at 100% load, all the burners are in the ignition state and are designed so that a stable combustion state can be obtained. The burner cut valve is used in an area where the number of burners is less than 4 and is not used for normal operation.

FIG. 7A is a flowchart of burner ignition, and FIG. 7B is a flowchart of fire extinguishing. As shown in FIG. 1A, the starting burner 1 and the main burner 2
In order to ignite, first, the ignition burner 3 is ignited, and then the starting burner 1 and the main burner 2 are sequentially ignited. When the ignition is completed, the ignition burner 3 is extinguished.

[0008] In normal load operation after the start is completed,
The operating width is determined to increase or decrease the load, and the operating width is usually 50 to 100%.

[0009]

By the way, the main burner 2 is ignited and extinguished with the load fluctuation.
It is necessary to ignite and extinguish the ignition burner 3 every time.
Therefore, the operation becomes complicated, and there are problems such as consumption of fuel used for the ignition burner 3 and consumption of the ignition device.

An object of the present invention is to provide a control method of a combustion apparatus which can solve such disadvantages of the prior art, improve operability, reduce the amount of fuel used for ignition, and prevent wear of an ignition apparatus. To be.

[0011]

In order to achieve the above object, the present invention provides a combustion apparatus having a plurality of burners each including a plurality of burner elements, wherein the burners close a predetermined number of the burner elements. A burner cut valve that opens and closes the burner cut valve for a part or all of the plurality of burners in the load operation range of the combustion device to set a predetermined number of the burner elements to an ignition state or a fire extinguishing state. Thus, it is characterized in that it is adapted to the load.

[0012]

The burner capacity is reduced by closing the burner cut valve installed on the starter burner. Normally, closing one burner cut valve to halve the burner capacity is the same as erasing half the main burner.

[0013] This makes it possible to cope with the load operation only by opening and closing the burner cut valve without igniting or extinguishing the main burner. By doing so, the operability can be improved and the amount of fuel used for ignition can be reduced, and the consumption of the ignition device can be prevented.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a flowchart of burner control according to the embodiment, and FIG. 2 is a characteristic diagram showing a relationship between a boiler load and a burner header pressure by operating a burner cut valve. In addition,
The configuration of the burner and the like is the same as in FIGS.

As shown in FIG. 1, when the load operation condition from the power supply command is satisfied, all the burners are ignited, and the number of full burners is set to 16.

If the value obtained by dividing the load by the number of burners, that is, the gas pressure value per burner is equal to or smaller than the number of burners reduced from the burner operation, a burner number reduction command signal is output. . If the number of burners is increased, a burner number increase command signal is output. The burner cut valve is opened / closed by the increase / decrease order of the number of burners. Since this burner cut valve corresponds to 1/2 burner, the gas pressure value is calculated assuming that the number of burners is reduced by 0.5 each time one burner cut valve is closed.

FIG. 2 shows the relationship between the boiler load and the burner header pressure due to the operation of the burner cut valve. Conventionally, the number of burners is 14 to 16 in the region where the load is 50 to 100%. However, in the burner cut valve operation of the present invention, a broken line between 15 and 16 burners when one is closed, and a burner when two are closed. The broken line between the 15 burners results in the same curve as the 14 burners when four are closed.

The relationship between the burner pressure and the load when the burner cut valve is opened and closed is indicated by a thick line.
With the opening and closing of the table, the number of burners remains 16 (full burner),
It turns out that it can respond in the range of plant load 2 / 4-4 / 4.

[0020]

The present invention is configured as described above, and can cope with a load change without the point of fire of the main burner. Therefore, operability can be improved and the amount of ignition fuel used can be reduced, and wear of the ignition device can be prevented.

[Brief description of the drawings]

FIG. 1 is a flowchart of burner control according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a relationship between a boiler load and a burner header pressure by operating a burner cut valve.

FIG. 3 is a layout diagram of a burner in the combustion device.

FIG. 4 is a perspective view of a starter burner.

FIG. 5 is a perspective view of a main burner.

FIG. 6 is a characteristic diagram showing a relationship between a boiler load and a burner header pressure according to a conventional method.

FIG. 7 is a flowchart of burner ignition and fire extinguishing according to a conventional method.

[Description of Signs] 1 Starter burner 2 Main burner 3 Ignition burner 6 Burner cut valve

────────────────────────────────────────────────── (5) References JP-A-62-178814 (JP, A) JP-A-63-294416 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 1/00 102 F23N 5/00

Claims (1)

(57) [Claims] 1. A combustion device comprising a plurality of burners each comprising a plurality of burner elements, wherein the burner includes a burner cut valve for closing a predetermined number of the burner elements, and in a load operation range of the combustion device, Controlling the combustion apparatus by opening and closing the burner cut valve for a part or all of the plurality of burners to set a predetermined number of the burner elements in an ignition state or a fire extinguishing state so as to correspond to a load. Method.