JPH04129613U - combustion device - Google Patents

Abstract

(57) [Summary] [Objective] To provide a combustion device in which stable combustion can be obtained without the flame formed near the periphery of a burner plate being blown away by secondary air. [Configuration] Mixer 6 provided on the upstream side of burner plate 1
A mixed gas guide plate 7 was provided inside the burner plate so as to face the peripheral edge of the burner plate and partition this area, thereby suppressing the supply of the mixed gas to the flame port 2 near the peripheral edge. [Effect] Because the flow velocity of the mixed gas at the flame outlet near the periphery is low, combustion in that area is progressing sufficiently, eliminating the risk of blow-off caused by secondary air, resulting in stable combustion. It will be done.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention supplies a mixed gas of vaporized fuel and air to a burner plate with multiple flame ports. This relates to a combustion device that supplies and burns the fuel.

0002

[Conventional technology]

FIG. 2 is a sectional view of a main part of this type of conventional combustion device.

0003 In the figure, 1 is a ceramic burner plate that forms the flame, and both sides of it are It is equipped with a large number of flame ports 2 passing through the space. 3 is a mixer, which is connected to burner plate 1. It surrounds the upstream surface, and the vaporized fuel injected from the nozzle 4 and the flow accompanying the injection. The premixed air is premixed with the incoming air indicated by arrow A, and then supplied to the burner plate 1. 5 is hard Fix burner plate 1 to mixture 3 by covering the periphery of burner plate 1 with fixed fittings. are doing.

0004 In the above combustion device, when vaporized fuel is injected from the nozzle 4, the mixture This is premixed with air and the mixed gas is supplied to the flame port 2. and ignite Then, a flame is formed on the downstream side of the flame port 2. On the other hand, secondary air is In this way, the fuel is supplied from below along the periphery of the burner plate 1. The secondary air flows through the periphery of the burner plate 1 towards its center.

[0005]

[Problem that the idea aims to solve]

However, in the above combustion device, the The flame formed at the flame port receives a lot of relatively high-speed and low-temperature secondary air, so There is a risk that the temperature of the flame will drop and the flame will blow out, especially when nitrogen oxidation occurs. If combustion is performed at a high air ratio to reduce There was a problem.

[0006] The purpose of this invention is to prevent flames formed near the periphery of the burner plate from being caused by secondary air. We have created a combustion device that allows stable combustion without causing blow-off. It is about providing.

[0007]

[Means to solve the problem]

In order to solve the above problem, the invention of claim 1 provides a burner having a large number of flame ports. The plate and the upstream surface of the burner plate are surrounded to premix vaporized fuel and air. A mixer is provided to supply the mixed gas to the burner plate from the mixer and the burner plate is connected to the burner plate. In a combustion device that supplies secondary air along the periphery of a nap plate for combustion, The mixer is located opposite the peripheral edge of the burner plate that includes part of the area where the flame openings are provided. The mixed gas supply side to the mixer and the burner plate side are almost parallel to each other. Installed upright on the burner plate side from the dividing flange and the inner peripheral edge of the flange. It is equipped with a mixed gas guide plate consisting of a wall section and a wall section. And the invention of claim 2 is applied to the mixer. The mixed gas guide plate, which separates the fuel supply side and burner plate side, is oriented downstream. It was formed into a cylindrical shape whose cross section becomes smaller as it goes.

[0008]

[Effect]

According to the invention of claim 1, the mixed gas guide plate comprising the flange portion and the wall portion , suppresses the mixed gas in the mixing chamber from flowing toward the flame opening near the periphery of the burner plate. , the flow velocity of the mixed gas at this part of the flame port is lower than that at other flame ports. and claims According to the invention of 2, a cylindrical mixed gas guide plate whose cross section becomes smaller toward the downstream side. This allows the mixed gas in the mixing chamber to flow from the area corresponding to the periphery of the burner plate to the burner plate. The flow velocity of the mixed gas at the flame outlet near the periphery is decreases as well.

[0009]

【Example】

FIG. 1 is a front cross-sectional view of the main part of a combustion device showing a first embodiment of the present invention, and FIG. It is a sectional view taken along the line C-C of the combustion device. In each figure, parts equivalent to Figure 2 are the same. The different parts will be explained below.

0010 6 is a mixer, which includes a box body 6A on the mixed gas supply side facing the nozzle 4, and a burner plate. - It is composed of a box body 6B on the side of the burner plate opposite to the plate 1, and the mixture is mixed between them. A gas guide plate 7 is interposed. The mixed gas guide plate 7 is arranged around the burner plate 1. A flange portion 7A that partitions the mixer 6 into a band shape and a flange portion facing the edge. It consists of a wall portion 7B standing upright from the inner peripheral edge of 7A toward the burner plate 1 side. flange The portion 7A is parallel to the burner plate 1, and the portion facing the peripheral edge thereof is connected to the outside portion. The wall section 7B partitions the area including the flame ports 2 of the row, and the wall section 7B flows inside thereof. The mixed gas is suppressed from moving toward the outer flame port 2. The edge of this wall portion 7B and the bar There is a gap of several mm between the nap plate 1 and the mixed gas supplied to the outer flame port. is decelerated by passing through this gap.

[0011] In the above configuration, when fuel is injected from nozzle 4, it mixes with air. , the mixed gas is guided by the mixed gas guide plate 7 and supplied to the burner plate 1, When ignited, a flame is formed on the downstream side of the flame port 2. The mixed gas passing through each flame port 2 is Due to the influence of flow resistance on the upstream and downstream sides of burner plate 1, It forms a gentle mountain-shaped flow velocity distribution, with high speed near the area and low speed at the periphery. are doing. The speed becomes even lower in a row of flame ports 2 on the peripheral edge side. On the other hand, secondary As shown by arrow B, the air flows into the center while touching the flame formed at the flame port 2 on the peripheral side. It will be supplied to the local community. The secondary air that comes into contact with the flame in this part is relatively fast and Although the temperature of the flame is low, the flow rate of the mixed gas is low and combustion is not progressing sufficiently. Therefore, there is no risk of blow-off even when combustion is performed at a high air ratio. By appropriately setting the gap between the wall portion 7B and the burner plate 1, stability is achieved. combustion conditions can be obtained.

0012 FIG. 4 is a front sectional view of the main parts of a combustion device showing a second embodiment of the present invention.

[0013] Reference numeral 8 denotes a mixed gas guide plate, which is used in place of the mixed gas guide plate 7 in FIG. the mixture The gas guide plate 8 is a flange portion attached between each box body 6A, 6B of the mixer 6. 8A, and a mixed portion bent from the flange portion 8A and facing the peripheral edge of the burner plate 1. It consists of a wall portion 8B that partitions the combiner 6 with a band-shaped inclined surface. The wall portion 8B is The area facing the peripheral edge of the burner plate 1 includes a row of flame ports 2 on the peripheral edge side. partition across the entire length of the burner plate 1, and tilt the mixed gas toward the center of the burner plate 1. It is obliquely formed into a cylindrical shape whose flow cross section becomes smaller toward the downstream side. this There is a gap of several mm between the edge of the wall portion 8B and the burner plate 1, and the outer flame opening The flow rate of the mixed gas supplied to 2 is reduced.

[0014] In this example, the mixed gas is guided closer to the center and the flame distribution shape is uniform. This increases the combustion efficiency and reduces the flow velocity of the mixed gas at the flame port 2 on the peripheral side. This eliminates the risk of the flame blowing away.

[0015]

[Effect of the idea]

As explained above, according to the invention of claim 1, the mixed gas guide plate is provided in the mixer. In addition, the flow velocity of the mixed gas at the flame opening near the periphery of the burner plate was suppressed. The flame formed at the flame opening has sufficiently progressed to burn and is blown away by secondary air. This eliminates the risk of combustion occurring and provides stable combustion. According to the invention of claim 2, If the mixed gas guide plate is guided toward the center of the burner plate, Both are configured to suppress the supply to the periphery, increasing combustion efficiency and providing stability. The result is a combustion with a high degree of combustion. As a result, stable combustion can be achieved even on the north side of high air, and the combustion engine can reduce the concentration of nitrogen oxides emitted from

[Brief explanation of drawings]

[Fig. 1] Front sectional view of main parts of a combustion device showing a first embodiment of the present invention.

[Figure 2] Cross-sectional view of main parts of a conventional combustion device

[Fig. 3] Cross-sectional view taken along the line C-C of the combustion device in Fig. 1

[Fig. 4] A front sectional view of the main parts of a combustion device showing a second embodiment of the present invention.

[Explanation of symbols]

1...burner plate, 2...flame mouth, 6...mixer, 7, 8...
Mixed gas guide plate, 7A...flange part, 7B, 8B... wall part.

Claims (2)

[Scope of utility model registration request] [Claim 1] A burner plate having a large number of flame ports;
A mixer is provided surrounding the upstream surface of the burner plate to premix vaporized fuel and air, and a mixer is provided to supply the mixed gas from the mixer to the burner plate. In a combustion device that supplies secondary air along the periphery of the burner plate for combustion, the mixer is arranged opposite to and almost parallel to the periphery of the burner plate, which includes a part of the flame opening area. It consists of a flange section that partitions the mixed gas supply side to the mixer and the burner plate side into a strip, and a wall section that stands up from the inner peripheral edge of the flange section on the burner plate side. A combustion device comprising a mixed gas guide plate. [Claim 2] A burner plate having a large number of flame ports;
A mixer is provided surrounding the upstream surface of the burner plate to premix vaporized fuel and air, and a mixer is provided to supply the mixed gas from the mixer to the burner plate. In the combustion apparatus for combustion by supplying secondary air along the periphery of the burner plate, the mixer is arranged such that a periphery of the burner plate is connected to the periphery of the burner plate. The mixed gas guide plate is provided with a band-shaped partition between the mixed gas supply side and the burner plate side, and the mixed gas guide plate is formed into a cylindrical shape whose cross section becomes smaller toward the downstream side. Characteristic combustion device.