JPH08128607A - Premixing type gas burner employing catalyst - Google Patents

Abstract

PURPOSE: To contrive the stabilization of flame in a pilot burner unit and the stabilization of the flame at the time of shifting of fire from the pilot burner unit to a main burner unit, in a premixing type gas burner. CONSTITUTION: In a premixing type gas burner having a constitution wherein premixture, obtained by mixing combustion air and fuel gas previously, is supplied to burn, main burner unit 1 is arranged in the vicinity of a pilot burner unit 2 while the pilot burner unit 2 is provided with a catalyst layer 3. On the other hand, a part in the vicinity of the pilot burner unit 2 in the main burner unit 1, is provided with another catalyst layer 3 in addition to the catalyst layer 3 of the pilot burner unit 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a premix gas burner using a catalyst.

[0002]

2. Description of the Related Art As is well known, a premixing gas burner having a structure in which combustion air and a fuel gas are mixed in advance and the premixed gas is supplied and burned is widely used as a combustion device for a boiler or the like. There is. In this premixed gas burner in which the main burner section and the pilot burner section are arranged adjacent to each other, the flame tends to become unstable when the fire is transferred from the pilot burner section to the main burner section. In particular, in the case of using a part of the combustion air supplied to the main burner section as the combustion air supplied to the pilot burner section, when the fire is transferred from the pilot burner section to the main burner section temporarily, This tendency is remarkable because the air ratio in the pilot burner is low. This is because when the fire is transferred from the pilot burner section to the main burner section, the pilot burner section is supplied with not only the combustion air but also the pre-mixture that should be supplied to the main burner section. Is.

[0003]

DISCLOSURE OF THE INVENTION The present invention aims at stabilizing the flame in the pilot burner part and stabilizing the flame at the time of transfer of the flame from the pilot burner part to the main burner part in the premixed gas burner. Has an aim.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a premixed gas burner configured to supply and burn a premixed mixture of combustion air and fuel gas in advance. In the above, the main burner section and the pilot burner section are arranged adjacent to each other, and the catalyst layer is provided in the pilot burner section. Further, the present invention is characterized in that, in addition to the catalyst layer of the pilot burner portion, a catalyst layer is provided in a portion of the main burner portion adjacent to the pilot burner portion.

[0005]

In the premixed gas burner in which the main burner section and the pilot burner section are arranged adjacent to each other, a catalyst layer is provided in the pilot burner section, and in addition to the catalyst layer in the pilot burner section, the main burner section By providing a catalyst layer adjacent to the pilot burner section, the flame in the pilot burner section was significantly stabilized, and the flame at the time of transfer from the pilot burner section to the main burner section was also significantly stabilized. Become.

[0006]

The preferred embodiments of the present invention will be described below. In FIG. 1, a main burner portion 1 and a pilot burner portion 2 are arranged adjacent to each other in a front end opening portion of a rectangular wind box 4. The main burner portion 1 and the pilot burner portion 2 are made of a heat-resistant material such as ceramic and have a porous flat plate shape. That is, a large number of flame holes are formed on the combustion surface side of the main burner portion 1 and the pilot burner portion 2. Of these, a catalyst is supported on the combustion surface side of the pilot burner portion 2 over a predetermined depth to form a catalyst layer 3. As the catalyst, a noble metal such as Ag, Pt, or Pd, a rare earth element such as Y or La, or a mixture thereof is used. By forming the catalyst layer 3 in the pilot burner section 2, the flame of the pilot burner section 2 can be stabilized, and the flame at the time of transfer of heat from the pilot burner section 2 to the main burner section 1 is also significantly stabilized. .

A partition member 5 is provided in the wind box 4.
Is provided, and the inside of the wind box 4 is divided into a main gas passage 6 and a pilot gas passage 7. Although the downstream end of the wind box 4 is connected to a blower (not shown), the main gas flow path 6 has a main part for mixing the fuel gas with the combustion air sent from the blower. A gas supply pipe 8 is provided. This main gas supply pipe 8
It is located upstream of the pilot gas passage 7. A pilot gas supply pipe 9 is provided in the pilot gas passage 7. The pilot gas passage 7 communicates with the main gas passage 6, and the main gas passage 6
A part of the fluid (combustion air, a premixed air of combustion air and fuel gas) flowing through the chamber flows into the pilot gas passage 7.

Next, the operation of the above structure will be described. When the burner is activated, first, the prepurge operation is performed for a predetermined time. Next, in the ignition operation, the fuel gas is supplied from the pilot gas supply pipe 9 to the pilot burner unit 2,
Ignition is performed by an appropriate ignition means (not shown) to form a pilot flame. At that time, the fuel gas supplied from the pilot gas supply pipe 9 is mixed with the combustion air branched from the main gas flow passage 6 to the pilot gas flow passage 7, and is supplied to the pilot burner unit 2 as a pilot premixed gas. It The pilot flame formed in the pilot burner portion 2 becomes a very stable flame due to the action of the catalyst layer 3.
Once the catalyst temperature rises, the flame does not become unstable even if the air ratio changes slightly, and a very stable pilot flame is formed.

Subsequently, the ignition operation of the main burner section is started. Fuel gas is supplied from the main gas supply pipe 8 to the main burner section 1, and the main flame is formed using the pilot flame as an ignition source. At that time, the fuel gas supplied from the main gas supply pipe 8 is mixed with combustion air and supplied to the main burner unit 1 as a main premixed gas. It is branched to the path 7 and is also supplied to the pilot burner section 2. Therefore, although the air ratio in the pilot burner unit 2 changes, the pilot flame is stably burned by the action of the catalyst layer 3 described above. Further, even when the fire is transferred from the pilot burner unit 2 to the main burner unit 1, the pilot flame is stable and no misfire or abnormal combustion occurs. After the main flame is formed, the fuel gas supply from the pilot gas supply pipe 9 is stopped, the fuel gas is supplied only from the main gas supply pipe 8, and the combustion is continued.

FIG. 2 shows another embodiment of the present invention. In the embodiment shown in FIG. 2, in addition to the catalyst layer 3 being provided in the pilot burner section 2, the main burner section 1 is also provided. Is also provided. In the main burner unit 1, the catalyst layer 3 is provided adjacent to the pilot burner unit 2. Thus, by providing the catalyst layer 3 in the portion of the main burner unit 1 adjacent to the pilot burner unit 2 (by providing the catalyst layer 3 so as to extend over both the main burner unit 1 and the pilot burner unit 2), The fire transfer from the pilot burner section 2 to the main burner section 1 is performed more smoothly, and the pilot flame and the main flame during the fire transfer are significantly stabilized. In the embodiment shown in FIG. 2, the same components as those in the embodiment shown in FIG. 1 are designated by the same reference numerals, and the detailed description of the configuration and operation will be omitted.

[0011]

EFFECTS OF THE INVENTION Since the present invention has the above-described structure, by providing the catalyst layer in the pilot burner section,
In addition to the pilot burner section, by providing a catalyst layer in the main burner section adjacent to the pilot burner section, the flame in the pilot burner section can be significantly stabilized. Therefore, it is possible to perform a reliable ignition operation without causing misfire or abnormal combustion of the pilot flame. Further, the flame at the time of the transfer of heat from the pilot burner section to the main burner section is also significantly stabilized, and the transfer of fire from the pilot burner section to the main burner section is carried out very smoothly.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Main burner part 2 Pilot burner part 3 Catalyst layer

Claims (2)

[Claims] 1. A premixing type gas burner configured to supply a premixed gas in which combustion air and a fuel gas are mixed in advance and burn the premixed gas.
A premixed gas burner using a catalyst, characterized in that a catalyst layer 3 is provided in the pilot burner section 2 adjacent to each other. 2. The premixed gas burner using a catalyst according to claim 1, wherein a catalyst layer 3 is provided in a portion of the main burner portion 1 adjacent to the pilot burner portion 2. Premixed gas burner using.