JPH04203703A - Gas burner - Google Patents

Abstract

PURPOSE:To reduce the generation of NOx, stabilize the combustion and lower combustion noises by providing an inner combustion tube provided with a concentrated gas burner port in the central section of a combustion tube and providing a through-hole on the side faces of the lower section of the inner combustion tube, forming a venturi section in a mixing chamber located above the through-hole, and providing a partition plate in the upper section of the mixing chamber. CONSTITUTION:At the time of combustion a gas of a low excessive air rate that is in an inner combustion tube 5 is blown out of a concentrated gas burner port 6 and burns, and, at the same time, it is blown out of an auxiliary burner port 7 and burns to form an auxiliary flame in the gap 10 in the pressure reducing wall 9. Further, the gas blown out of a through-hole 8 mixes with the air from a secondary air port 3 and they are mixed well uniformly by the venturi section 14, generating a dilution gas with a high rate of excessive air, and they are supplied to a diluted gas burner port 12. Localized high temperature sections are eliminated by the combustion of both concentrated and diluted gases at the concentrated gas burner port 6 and the dilution gas burner port 12, and the generation of NOx is reduced. On the both side sections of a partition plate 11 the upper gap 13 is enlarged and the mixture gas blown out of both sides of the partition plate 11 loses its velocity and burns, stabilizing the combustion and lowering the combustion noises.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a gas burner designed to reduce nitrogen oxides (hereinafter referred to as NOx) and reduce noise.

(Conventional technology!II) Various efforts have been made to solve the problem of NOx being generated due to localized high-temperature areas in conventional gas burner combustion systems.One of the countermeasures is There is a concentration combustion method, for example, as described in the Publication No. 11857-12923, a method using a long hole plate such as ceramic having many minute long holes is known, but it is expensive due to its structure. There is a real problem. If this were constructed by arranging multiple small sheet metal combustion tubes in parallel, the above problem would be alleviated, but the volume inside the combustion tubes would be limited and there would be no space for mixing and homogenizing the gas and air. Due to insufficient mixing of gas and air, stable combustion performance cannot be obtained, and it is difficult to solve the above problems and it has not been put to practical use.

The present invention solves these problems and achieves low noise by using a combustion tube made of sheet metal and reducing NOx and stabilizing combustion.
The purpose is to provide a light combustion type gas burner.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a long rich gas hole in the center of a combustion tube forming a mixing chamber with an open upper part and a secondary air port opened in the lower part. A combustion inner tube is provided, a through hole is provided in the lower side of the combustion inner tube, a venturi part is formed in the mixing chamber above the through hole, and a lean gas flame port is formed in the upper part of the mixing chamber. A partition plate is provided, and the partition plates on both sides are shaped to decelerate the ejected gas.

(Function) During combustion, the dense gas with a low air excess in the combustion inner tube is ejected from the long rich gas hole and burned, and the gas ejected into the mixing chamber from the through hole flows into the secondary air port at the bottom of the combustion tube. Next, air is mixed in, thoroughly mixed and homogenized by the venturi section, and a lean gas with a high air excess ratio is produced, which is ejected from the lean gas flame port and burned.

The mixed gas ejected from the rich gas elongated hole and the lean gas flame port have different gas concentrations, and this concentrated combustion eliminates local high temperature areas and reduces the generation of NOx.

Further, since the side portions of the partition plate forming the diluted gas flame port slow down and burn the ejected gas, the lift resistance of the flame is improved, the overall combustion is stabilized, and combustion noise is reduced.

(Example) FIG. 1 is a plan view of essential parts showing an embodiment of the present invention.

FIG. 2 is a sectional view of the main part on the same side, and FIG. 3 is a sectional view of the main part showing another embodiment.

(1) has an opening (2) at the top, forms a mixing chamber (4) with a secondary air port (3) at the bottom, and has a combustion chamber (4) separated from the mixing chamber (4) in the center. A gas burner is constructed by arranging a plurality of combustion tubes (1) in parallel.

The combustion inner tube (5) is a mixture of gas and primary air, in which concentrated gas with low air excess flows through the inner combustion tube (5), and has a hot gas long hole (6) on the top and an auxiliary long hole (7) on the side. It is designed to eject from a through hole (8) provided at the bottom. (9) is a decompression wall provided to form a gap 11i (10) over the entire length of the upper side of the combustion inner pipe (5), which burns the mixed gas from the auxiliary elongated hole (7) and creates a gap 1 [ 1 (10) Form an auxiliary flame at the top.

(11) is a plurality of partition plates arranged in parallel above the mixing chamber (4) of the combustion tube (1), forming a rare gas flame port (12) at the upper end. Both sides of this partition plate (11) are FJ (13) between the upper parts.
It has a shape that decelerates the ejected gas by enlarging it. In addition, as a method of decelerating the ejected gas, as shown in FIG. 3, the side wall of the combustion tube (1) is deformed and the upper part If! It may also be formed by enlarging (13).

(14) is a venturi part formed in the mixing chamber (4) above the through hole (8) of the combustion inner pipe (5), and the gas from the through hole (7) is mixed with the gas from the secondary air port (3). Next, air is mixed and homogenized by mixing well to produce a diluted gas with a high air excess.

In the above configuration, during combustion, the dense gas with a low excess air ratio in the combustion inner pipe (5) is ejected from the rich gas elongated hole (6) and combusted, and is ejected from the auxiliary elongated hole (7) and combusted. (9
) An auxiliary flame is formed in the gap (10).

In addition, the gas ejected from the through hole (8) is further transferred to the secondary air port (
The air from 3) is mixed well by the venturi section (14) and homogenized to produce a lean gas with a high air excess section, which is then supplied to the lean gas flame port (12).

In this way, the rich gas elongated hole (6) and the dilute gas flame port (12)
The gas concentration of the mixed gas that is ejected and burned increases, and this concentrated combustion eliminates local high-temperature areas and reduces the generation of NOx.

The flame of the lean gas outlet (12) and the flame of the rich gas elongated hole (6) are formed by the auxiliary elongated hole (7), which is well and uniformly mixed by the venturi part (14) and stably burns in short flames. It is further stabilized by the auxiliary flame, and the partition plate (11
) Since the mixed gas ejected from both sides of the flame is decelerated and combusted, the lift resistance of the entire main flame is improved, and combined with the flame-holding effect of the auxiliary flame, the overall combustion is stabilized and noise can be reduced. .

(Effects of the Invention) As described above, the present invention provides a combustion inner tube in which a rich gas long hole and an auxiliary long hole are provided in the center of the combustion tube forming a mixing chamber,
A venturi section is formed in the mixing chamber, and a partition plate is provided at the top of the mixing chamber to form a diluted gas flame port, which slows down the gas ejected from both sides, reducing the generation of NOx through concentrated combustion. Furthermore, by improving the lift resistance due to the flame-holding effect of the rich gas flame and the auxiliary flame and the combustion of gas with a slow evacuation rate, the overall combustion can be stabilized and combustion noise can be reduced.

Part-I! Figure p is a sectional view of a main part showing another practical example.

(1)... Combustion tube (2)...Opening (3)...Secondary air port (4)...Mixing chamber (5)...Inner combustion tube (6)...dense gas long hole (7)...Auxiliary long hole (8)...Through hole (11)...Partition plate (12)...Lean gas flame mouth

Claims (1)

[Claims] A combustion inner tube with a rich gas elongated hole is provided in the center of the combustion tube forming a mixing chamber with an opening at the top and a secondary air port at the bottom, and A venturi section is formed in the mixing chamber above the through hole, a partition plate is provided at the top of the mixing chamber to form a diluted gas flame port, and both sides of the partition plate are shaped to decelerate the ejected gas. A gas burner characterized by: