JPS609570Y2 - boiler combustion equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a boiler combustion device that performs burner tilting.

In a conventional boiler combustion device using a burner nozzle, a burner nozzle 1 is placed between nozzle partition plates 2 that feed combustion air, as shown in Figures 1a and 1b, in order to maintain the steam temperature at the boiler outlet at a target value. , the burner nozzle is the first
The combustion zone in the furnace is changed by moving it vertically or horizontally from a position parallel to the nozzle partition plate 2 as shown in Figure A to a position at an angle to the nozzle partition plate 2 as shown in Figure 1. It's like that.

In order to allow the nozzle 1 to perform tilting movement in this manner, an appropriate gap 3 is required between the nozzle 1 and the nozzle partition plate 2.

For this reason, the combustion air sent along the nozzle partition plate 2 cannot completely enter into the nozzle 1, and a considerable amount of leaked air flows into the furnace.

Therefore, this leaked air is released outside the furnace without contributing to combustion, so it is necessary to increase the boiler design excess air ratio, which lowers the temperature inside the furnace and increases heat loss. was.

The present invention aims to overcome the above-mentioned drawbacks and provide a boiler combustion device with good performance.

In order to achieve this objective, in the present invention, an air leak prevention plate is attached to the nozzle partition plate and is inclined inward of the air inlet of the burner nozzle.

An embodiment of the present invention will be described below with reference to FIGS. 2a and 2b.

That is, in the present invention, the gap 3 between the nozzle partition plate 2 and the burner nozzle 1 is required for tilting the burner nozzle, so it is secured so that the combustion air can completely enter the burner nozzle 1. An air leak prevention plate 4 inclined inward of the air population 5 of the nozzle is attached by welding to the nozzle partition plate 2.

As a result, air leakage can be prevented both when the burner nozzle 1 is parallel to the partition plate 2 as shown in FIG. 2a, and when it is at an angle to the partition plate 2 as shown in FIG.

Figure 3 shows the results of an actual combustion test, where curve A shows the conventional type and curve end shows the present invention.

It has been shown that complete combustion is sufficiently carried out in the fuel according to the present invention, and the excess air ratio can be reduced by 1.2 to 1.5% compared to the conventional fuel.

Therefore, by preventing wasteful leakage air that does not contribute to combustion, low air excess ratio operation is achieved, which improves efficiency by reducing exhaust gas loss, reducing the power of forced draft fans and induced draft fans, and reducing NOx. It becomes possible to reduce SO3, etc.

Moreover, by installing this device, the burner tilting function is not impaired at all, and the steam temperature controllability is completely unchanged from the conventional method.

[Brief explanation of the drawing]

1A and 1B are cross-sectional views of a conventional burner tilting device in different states, FIGS. 2A and 2B are sectional views of a burner tilting device according to the present invention in different states, and FIG. FIG. 3 is a curve diagram showing a comparison of combustion test characteristics between the present invention and that of the present invention. 1... Burner nozzle, 2... Nozzle partition plate, 3... Gap, 4... Air leak prevention plate, 5... Nozzle air inlet.

Claims (1)

[Scope of utility model registration request] In a boiler combustion device having a burner nozzle arranged between nozzle partition plates forming a passage for feeding combustion air and movable from a position parallel to the nozzle partition plate to a position at an angle to the nozzle partition plate. . A boiler combustion device, characterized in that an air leak prevention plate inclined toward the air inlet of the burner nozzle is attached to the nozzle partition plate.