JP2894056B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus using a flame plate such as a ceramic plate having a large number of flame holes.

[0002]

2. Description of the Related Art In a conventional combustion system, an all-primary air combustion system is effective as a combustion system capable of high-density combustion by shortening the flame and reducing NOx emissions. However, in principle, the combustion range is narrow,
Poor flame stability.

[0003] As a combustion method for improving this and achieving low NOx, a lean mixture having a large excess air ratio and a rich mixture having a small excess air ratio are burned, and the lean mixture flame is converted to a rich mixture flame. It is well known that a so-called light-and-dark combustion method in which the above-described method is used is effective. That is, as shown in Japanese Utility Model Laid-Open Publication No. 2-36715 or Japanese Utility Model Laid-Open Publication No. 2-36716, a fuel plate having a large number of flame holes, such as a ceramic plate, is provided. A main flame is formed on the flame plate by the supplied lean mixture, a supplementary flame is formed around the main flame by the rich mixture supplied from the rich mixture passage, and the main flame is formed by the flame holding effect. I try to make it stable.

[0004]

However, in such a combustion apparatus, the flame stability is not sufficient, and even if the conditions are slightly deviated, noise is likely to increase or oscillating combustion is likely to occur. The length of the flame is almost determined by the bottom area of the flame (the base area of the flame), the flow rate of the mixed gas and the air-fuel ratio. Has the disadvantage that the lifting resistance is reduced or the noise is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a combustion apparatus which has a reduced flame length and flame stability and has low noise.

[0006]

The present invention has the following configuration to achieve the above object.

That is, it has a flame hole plate provided with a large number of flame holes,
A main flame portion is formed on the flame hole plate by the mixture supplied from the main flame mixture passage, and a supplementary flame portion is formed around the main flame portion by the mixture supplied from the supplementary mixture passage. In the present invention, a supplementary flame section to which a supplementary flame mixture is supplied is formed at the center of all or a part of the main flame section.

[0008]

The main flame portion is formed on the flame plate by the main flame mixture supplied from the main flame mixture passage, and the auxiliary flame portion is formed therearound by the supplementary flame mixture supplied from the supplementary flame mixture passage. Formed to stabilize the main flame. A supplementary flame portion is formed also in the central portion of the main flame by the supplementary flame mixture supplied through the supplementary flame mixture passage, and the main flame is held on the flame hole plate by the peripheral flame and the central flame supplementation. Has been burning stably. Therefore, the main flame can be shortened without increasing the flame hole load, and the flame stability can be improved.

[0009]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.
FIG. 2 is a plan view of a main part, and 1 is a combustion device having a flame plate 3 such as a ceramic plate provided with a large number of flame holes 2 on an upper portion thereof to produce a light mixture having a large excess air ratio. Mixing chamber 4;
A sub-mixing chamber 5 for producing a rich mixture having a higher gas concentration than the main mixing chamber 4 is provided, and a main flame mixture passage 6 for guiding a light mixture to the flame plate 3 and a periphery of the main flame mixture passage 6 are provided. The supplementary flame mixture passage 7 for guiding the rich mixture to the flame hole plate 3 is separated and formed by a partition wall 8 and a tubular portion 9 having a main flame mixture passage 6 projecting from the partition wall 8. The light mixture supplied to the hot plate 3 forms a main flame portion A on the hot plate 3, and the rich mixture forms a supplementary flame portion B on the hot plate 3. Reference numeral 10 denotes a supplementary flame mixture passage which passes through the center of the main flame mixture passage 6 and supplies a rich mixture to the flame plate 3, and forms a supplementary flame portion C at the center of the main flame portion of the flame plate 3.

During combustion, the lean mixture formed in the main mixing chamber 4 forms a main flame on the upper surface of the flame hole plate 3, and the rich mixture formed in the sub-mixing chamber 5 forms the main flame on the upper surface of the flame hole plate 3. A supplementary flame is formed around the flame to stabilize the main flame. The rich mixture supplied by the supplementary flame mixture passage 10 forms a supplementary flame also in the center of the main flame, so that the main flame portion A and the surrounding flame retardant portion B have the supplementary flame portion C at the center. Is held on the flame plate 3. Therefore, the flame hole load of the main flame is not greatly increased, and the main flame is shortened. Further, the flame stability of the main flame is improved by increasing the number of hold portions of the flame.

Even if the auxiliary flame portion C is formed at the center of a part of the main flame portion A instead of all the main flame portions, the uniformity of the main flame is lost and the combustion flame is more effective. Becomes

[0012]

As described above, according to the present invention, a supplementary flame portion is provided at the center of the main flame portion in all or a part of the main flame portion. The main flame can be shortened and the stability can be improved. Therefore, the combustion chamber can be reduced in size and the combustion noise can be reduced by shortening the main flame and improving the stability.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a combustion apparatus showing one embodiment of the present invention.

FIG. 2 is a plan view of a main part of the same example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion device 3 Flame perforated plate 6 Main flame mixture passage 7 Supplementary mixture passage 10 Supplementary mixture passage A Main flame section B Supplement flame section C Supplement flame section

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F23D 14/02 F23D 14/14-14/16 F23D 14/74 F23C 11/00 329-330

Claims (1)

(57) [Claims] 1. A flame plate having a plurality of flame holes, and a main flame portion is formed on the flame hole plate by a mixture supplied from a main flame mixture passage. Forming a supplementary flame portion by a mixture supplied from a supplementary flame mixture passage, characterized in that a supplementary flame portion to which the supplementary flame mixture is supplied is formed at the center of all or a part of the main flame portion. And combustion equipment.