JPH07180803A - Boiler furnace - Google Patents

Abstract

PURPOSE:To improve an arrangement of a combustion device in a medium-sized or small-sized boiler furnace having a rectangular shape of horizontal section. CONSTITUTION:Combustion devices 2 are installed at walls 4a, 4a of a combustion chamber which are oppositely faced from each other in a combustion chamber 1 having a rectangular sectional surface. Both fuel and air are injected in such a way that both flames may be displaced at the central part of the combustion chamber 1, turned and then ignited. With such an arrangement as above, a heat transfer surface of the combustion chamber is effectively utilized and an allowable flame combustion finishing length can be taken long. In addition, a gas unbalance at the outlet port of the combustion chamber is reduced and a preferable uniform flow for a heat exchanger placed at a downstream side can be attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a furnace for a small and medium-sized boiler,
In particular, it relates to the arrangement of the combustion device.

[0002]

2. Description of the Related Art Conventionally, there have been a front combustion system, a corner combustion system, an opposed combustion system, and the like in the arrangement of a combustion apparatus of a boiler furnace. As shown in the horizontal sectional view of FIG. 2A and the side view of FIG. 2B, the front combustion system is a system in which a combustion device (2) is provided on one wall of the combustion chamber (1) for combustion. Is. Also, the corner combustion method is as shown in FIG.
As shown in (b), the combustion is performed from the four corners of the combustion chamber (1) toward the tangential direction of the virtual center cylinder (3). And, as shown in FIGS. 4 (a) and 4 (b), the opposed combustion method is a method in which combustion is performed from the opposing wall surfaces of the combustion chamber (1) toward the facing wall.

[0003]

The conventional arrangement of the combustion apparatus of the boiler furnace has the following problems to be solved. 1) In the front combustion method, since an independent flame is formed in each combustion device, a region that is not effectively used occurs in the combustion chamber. Further, the distance from the combustion device to the outlet of the combustion chamber becomes the allowable burn-out length of the flame, and the fuel consumption amount is easily restricted.

2) In the corner combustion system, 4 in the combustion chamber
Since the combustor is installed in the corner, the arrangement of each pipe, duct, etc. becomes complicated, and a large operation space is required, which is not suitable for small and medium-sized boilers.

3) In the opposed combustion method, since the flame is concentrated in the center, there is a region that is not effectively used in the combustion chamber. Also, similar to the corner combustion method, there are some aspects that are not suitable for small and medium-sized boilers, such as complicated piping and ducts and a large space requirement.

[0006]

In order to solve the above-mentioned conventional problems, the present inventor has found that in a boiler furnace having a rectangular horizontal cross section, the injection directions of fuel and air are formed on two combustion chamber walls facing each other. This is to propose a boiler furnace that is equipped with a combustion device so that each can pass in the center of the combustion chamber.

[0007]

Since the present invention is configured as described above, the flames of the combustion device pass each other in the central portion of the combustion chamber, reach the vicinity of the wall surfaces facing each other, and then rise while swirling in the combustion chamber. To the exit. Therefore, the flame fills the combustion chamber and its heat transfer surface can be used evenly and effectively.Because the flame swirls, the allowable flame burnout length determined by the combustion chamber shape and flame pattern is increased. Can be taken. Furthermore, since the flames are mixed in the combustion chamber, the gas imbalance at the outlet of the combustion chamber is reduced, resulting in a uniform gas flow that is desirable for the heat exchanger installed downstream of the combustion chamber.

[0008]

1 is a conceptual view showing an embodiment of the present invention, and FIG. 1 (a) is a horizontal sectional view taken at a position of a combustion apparatus.
1B is a side view, and FIG. 1C is a front view. In the present embodiment, from the combustion device (2) attached to the mutually facing short side walls (4a), (4a) of the combustion chamber (1) having a rectangular horizontal section, the wall surface (4a),
Fuel and air are injected and burned at right angles to (4b) and so that the flames pass each other at the center of the combustion chamber (1).

The flame reaching the vicinity of the opposing wall surface (4a) rises while swirling in the combustion chamber (1) and reaches the combustion chamber outlet. Therefore, the flame fills the combustion chamber (1), and the heat transfer surface can be evenly and effectively utilized.
Further, since the flame swirls, the allowable flame burn-out length determined by the shape of the combustion chamber and the flame pattern can be increased. Further, since the flames are mixed in the combustion chamber (1), the gas imbalance at the outlet of the combustion chamber is reduced, and a uniform gas flow desirable for the heat exchanger installed on the downstream side of the combustion chamber is obtained.

On the other hand, focusing on the relationship with the boiler body,
The can width dimension determined from the required drum length is usually the long side (4b) of the combustion chamber (1), but by taking this can width length in the combustion direction, the combustion distance can be effectively secured. Further, compared to the conventional corner combustion method or opposed combustion method, the piping and ducts are simpler and the operating space is smaller.

[0011]

In the boiler furnace of the present invention, the flame fills the combustion chamber, the heat transfer surface can be used evenly and effectively, and the flame swirls, so that the combustion chamber shape and flame pattern The allowable flame burnout length determined can be increased. Further, since the flames are mixed in the combustion chamber, the gas imbalance at the outlet of the combustion chamber is reduced, and a uniform gas flow desired for the heat exchanger installed on the downstream side of the combustion chamber is obtained.

Further, when attention is paid to the relationship with the boiler body, the combustion equipment and peripheral equipment can be simplified and the operation space can be reduced as compared with the conventional corner combustion method or opposed combustion method.

[Brief description of drawings]

1 is a conceptual diagram showing a boiler furnace according to an embodiment of the present invention, FIG. 1 (a) is a horizontal sectional view taken at a position of a combustion device, and FIG. 1 (b) is a side view thereof. Similarly, FIG. 1C is a front view.

FIG. 2 is a conceptual view showing a conventional front combustion type boiler furnace, FIG. 2 (a) is a horizontal sectional view taken at a position of a combustion device, and FIG. 2 (b) is a side view thereof.

FIG. 3 is a conceptual view showing a conventional corner combustion type boiler furnace, FIG. 3 (a) is a horizontal sectional view taken at a position of a combustion device, and FIG. 3 (b) is a side view thereof.

FIG. 4 is a conceptual view showing a conventional opposed combustion type boiler furnace, FIG. 4 (a) is a horizontal sectional view taken at a position of a combustion apparatus, and FIG. 4 (b) is a side view thereof.

[Explanation of symbols]

 (1) Combustion chamber (2) Combustion device (3) Virtual center cylinder (4a) Short side wall (4b) Long side wall

Claims (1)

[Claims] 1. A boiler furnace having a rectangular horizontal cross section,
A boiler furnace characterized in that two combustion chamber walls facing each other are equipped with combustion devices so that the injection directions of fuel and air pass each other at the center of the combustion chamber.