JP2000074328A - Corrugated nozzle plate burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relatively largely take air holes by forming uniform flames of blue fire on a surface. SOLUTION: One wall surface of a wind box 11 is formed of a sectional substantially sine waveform corrugated sheet 12, and gas pipes 13 for supplying fuel gas are integrally connected and disposed at respective troughs of the sheet 12 along the troughs of the sheet 12 at an inside of the box 11. Gas jet ports 14 communicating with the pipes 13 are arranged along the troughs of the sheet 12, while air jet ports 15 for injecting the air are arranged at intermediate sites of the ridges and the troghs of the sheet 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated-plate mixed surface combustion burner capable of forming a uniform blue fire flame on a surface and having a relatively large air hole. .

[0002]

2. Description of the Related Art As a recent gas-fired small once-through boiler 1, for example, as shown in FIG. 9, a front row water pipe 3 and an adiabatic space 4 are formed in a furnace 2 and a high-load premix burner 5 burns from the side. There is a thing of the structure which made it perform. In such a small once-through boiler 1, the front row water pipe 3 immediately downstream of the burner 5 realizes low NOx due to a flame cooling effect, and completely oxidizes unburned components generated in the front row water pipe 3 in the heat insulating space 4. Like that. The high-load premix burner 5
The thing which improved the mat material etc. is applied,
It is possible to form a blue fire uniformly on the surface.

[0003]

However, in such a high-load premix burner 5, the flow path through which the premixed gas passes is set to be narrow to prevent flashback, so that the flow path is supplied. Dust and the like contained in the air may cause clogging, and therefore, a filter is required at the time of intake. In addition, a large differential pressure between the premixed gas and the furnace required a large blower and a high gas pressure. The present invention has been proposed in view of such a background, and a corrugated mixing surface capable of forming a uniform blue fire flame on a surface and having a relatively large air hole. It is intended to provide a combustion burner.

[0004]

In order to solve the above-mentioned problems, the present invention is to form one wall surface of a wind box by corrugated plates at regular intervals, and to form a wall portion of the corrugated plate inside the wind box at a valley portion. A gas pipe for supplying the fuel gas is integrally connected and arranged at each valley portion of the corrugated sheet, and a gas ejection port communicating with the gas pipe is arranged along the valley portion of the corrugated sheet, while the corrugated sheet is provided. In the middle portion between the peak and the valley, air jet ports for jetting air are arranged in line, and fuel gas is jetted from the gas jet in the valley of the corrugated sheet, and the peak of the corrugated sheet and Air is blown from the air outlet at the middle part of the valley to form a flame by premixing. In the above-described configuration, the gas outlets at the valley portion of the corrugated sheet are lined up at equal intervals in the longitudinal direction of the gas pipe, while the air jet ports at an intermediate portion between the peak portion and the valley portion of the corrugated sheet are provided at the peak portion of the corrugated sheet. The gas outlets and the air outlets adjacent to each other were arranged in parallel at equal intervals so that the heights were equal. In addition, while the gas outlets at the valleys of the corrugated sheet are arranged at equal intervals in the longitudinal direction of the gas pipe, the air outlets at an intermediate portion between the peaks and the valleys of the corrugated sheet are parallel to the peaks of the corrugated sheet. The gas outlets and the air outlets adjacent to each other are arranged at equal intervals so that the heights are different. In addition, a part of air is introduced into a gas pipe for feeding a fuel gas into the gas pipe so as to be partially premixed. Further, in the wind box, a through hole communicating with the inside of the wind box is formed in the gas pipe,
A part of the fuel gas was mixed with the air in the wind box so as to be partially premixed. Further, the cross section of the corrugated plate can be formed in a substantially rectangular wave shape.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a corrugated plate mixed surface combustion burner according to the present invention will be described with reference to the drawings. FIG. 1 shows a burner 10 with a mixed surface burner at the front of a corrugated sheet. In this burner 10 with a mixed surface burner at the front of a corrugated plate, one wall surface of a wind box 11 is formed by corrugated plates 12 having a constant interval, that is, a substantially sinusoidal cross section. At the same time, a gas pipe 13 for supplying the fuel gas is integrally connected to each valley portion of the corrugated plate 12 along a valley portion of the corrugated plate 12 inside the wind box 11. The corrugated plate 12 is provided with gas outlets 14 communicating with the gas pipes 13 along the valleys of the corrugated plate 12, and air is supplied to a middle portion between the ridges and the valleys of the corrugated plate 12. Air spout 15 for spouting
Are arranged. With such a configuration, the corrugated plate front-end surface combustion burner 10 allows the fuel gas to be ejected from the gas ejection port 14 at the valley portion of the corrugated plate 12 and the air ejection port at an intermediate portion between the peak portion and the valley portion of the corrugated plate 12. Air is ejected from the nozzle 15 to form a flame by premixing. That is, as shown in FIG. 2, in the vicinity of the surface of the corrugated sheet 12 in the wind box 11, the ejection flow of the fuel gas ejected from the gas ejection port 14 in the trough portion of the corrugated sheet 12 communicating with the gas pipe 13, An air outlet 15 provided at an intermediate portion between both the crest portion and the valley portion of the corrugated sheet 12.
The fuel gas and air are mixed by ejecting air from the air.

The gas outlets 14 at the valleys of the corrugated plate 12 and the air outlets 15 at the intermediate portions between the valleys and the valleys of the corrugated plate 12 correspond to the gas pipe 13, that is, the entire corrugated plate 12. As shown in FIG. 3, they can be formed at the same height. In addition, the gas outlet 1
As shown in FIG. 4, the air outlets 4 and the air outlets 15 may be formed alternately (in a staggered manner) at equal intervals, as shown in FIG. 4, to promote mixing.

The above-described corrugated plate mixed surface combustion burner 10
According to the above, the fuel gas and the air are separately supplied to the surface of the corrugated sheet 12 through the gas pipe 13 and the wind box 11,
By jetting and premixing the fuel gas and air, it is possible to form a premixed flame. In this case, since the gas outlets 14 and the air outlets 15 are formed uniformly and regularly on the entire surface of the corrugated plate 12, it is possible to form a uniform flame on the entire surface. it can.

[0008] Thus, the corrugated plate front mixing surface combustion burner 10
As for the mixing method of the fuel gas and the air in the above, a completely premixing method in which all of the fuel gas and air are jetted individually on the surface of the corrugated plate 12 as described above may be used, or a part of the mixing may be premixed as described below. The air may be ejected to the corrugated plate 12 surface. If a part of the gas is ejected to the surface of the corrugated sheet 12 as a premixed gas, the mixing is further promoted, and stable combustion becomes possible. For example, gas pipe 1
A part of the fuel gas is supplied to an air pipe (not shown) that branches off from a fuel gas pipe (not shown) that feeds the fuel gas into the air box 3 and feeds the air into the wind box 11.
The air may be ejected from the air outlet 15 of the corrugated plate 12 to the surface of the corrugated plate 12 (see FIG. 5).

As means for jetting a part of the premixed gas onto the surface of the corrugated plate 12, through holes 16 and 17 communicating with the inside of the wind box 11 are formed in a gas pipe 13 in the wind box 11 to provide fuel gas. Can be mixed into the air in the wind box 11 for premixing, and can be ejected from the air ejection port 15 of the corrugated plate 12 to the surface of the corrugated plate 12 (see FIGS. 6 and 7).

Although the present invention has been described with reference to the burner 10 with a mixed-surface burner at the tip of the corrugated plate, in addition to the corrugated plate 12 having a sinusoidal cross-section, a corrugated plate having a rectangular cross-sectional shape as shown in FIG. 20 can also be applied. Further, a corrugated sheet having another cross-sectional shape can be applied as long as the shape provides good mixing on the surface of the corrugated sheet.

[0011]

According to the present invention, a corrugated plate is formed in a wind box, and a gas mixing port and an air discharging port are provided on one surface of the corrugated plate to form a premixing space. Since a uniform blue fire flame can be formed and the air jet port can be made relatively large, there is no danger of (1) clogging by dust in the air as in the prior art. No filter is required. (2) The blower can be reduced in size and power can be saved.

[0012]

[Brief description of the drawings]

FIG. 1 is a schematic perspective explanatory view showing one embodiment of a corrugated plate mixed surface combustion burner according to the present invention.

FIG. 2 is a cross-sectional surface burner shown in FIG. 1;
It is typical sectional explanatory drawing which shows the formation positional relationship of the gas ejection port and the air ejection port on the corrugated sheet surface.

FIG. 3 is a schematic side view showing a positional relationship between a gas ejection port and an air ejection port on the corrugated sheet surface in the corrugated sheet mixed surface combustion burner shown in FIG. 1;

FIG. 4 is a schematic side view illustrating a positional relationship between a gas ejection port and an air ejection port on a corrugated sheet surface in the corrugated sheet combustion burner shown in FIG. 1;

FIG. 5 is a cross-sectional surface burner burner shown in FIG. 1;
FIG. 4 is a schematic cross-sectional explanatory view showing a state in which a part of a premixed gas is ejected to a corrugated sheet surface.

FIG. 6 is a cross-sectional surface burner with a corrugated plate tip shown in FIG. 1;
FIG. 3 is a schematic cross-sectional explanatory view showing a structure for ejecting a partially premixed gas onto a corrugated sheet surface.

FIG. 7 is a cross-sectional surface burner burner shown in FIG. 1;
FIG. 8 is a schematic cross-sectional explanatory view showing another example of a structure for jetting a partially premixed gas onto a corrugated sheet surface.

FIG. 8 is a schematic side view showing another example of the corrugated plate mixed surface combustion burner according to the present invention.

FIG. 9 is a schematic structural explanatory view showing an example of the structure of a current once-through boiler.

[Description of Signs] 10 Corrugated Plate Burning Surface Burner 11 Wind Box 12, 20 Corrugated Plate 13 Gas Pipe 14 Gas Jet Port 15 Air Jet Port 16, 17 Through Hole

Claims (6)

[Claims] 1. A gas pipe for supplying a fuel gas along a valley portion of a corrugated sheet inside the wind box, wherein one wall surface of the wind box is formed by corrugated sheets at regular intervals. A gas outlet communicating with a gas pipe is arranged along the valley portion of the corrugated sheet, while air is ejected to an intermediate portion between the valley portion and the valley portion of the corrugated sheet. Air jet ports are arranged in line, and fuel gas is jetted from the gas jet ports at the valley portions of the corrugated sheet, and air is jetted from the air jet ports at an intermediate portion between the peak and valley portions of the corrugated sheet. A corrugated mixed-surface combustion burner characterized in that a flame is formed by mixing. 2. A gas ejection port at a valley portion of the corrugated sheet is arranged at equal intervals in a longitudinal direction of the gas pipe, while an air ejection port at an intermediate portion between the valley portion and the valley portion of the corrugated sheet is corrugated. 2. The combustion burner according to claim 1, wherein the gas outlets and the air outlets adjacent to each other are arranged at equal intervals in parallel with each other. . 3. A corrugated gas outlet at a valley portion is arranged at equal intervals in the longitudinal direction of the gas pipe, while an air outlet at an intermediate portion between the corrugated portion and the valley portion is provided at a corrugated portion of the corrugated plate. 2. The corrugated plate mixed surface combustion according to claim 1, wherein the gas jets and the air jets adjacent to each other are arranged at different positions in parallel at equal intervals. Burner. 4. The gas pipe according to claim 1, wherein a part of air is introduced into a gas pipe for feeding a fuel gas into the gas pipe, and a part of the air is premixed. 2. The burner according to claim 1, wherein: 5. In the wind box, a through hole communicating with the inside of the wind box is formed in the gas pipe so that a part of the fuel gas is mixed with the air in the wind box to be partially premixed. Any one of claims 1 to 3, characterized in that:
A burner with a mixed surface burner at the end of the description. 6. The corrugated sheet according to claim 1, wherein a cross section of the corrugated sheet has a substantially rectangular wave shape.
A burner with a mixed surface burner at the end of the description.