JP3499174B2 - Low-pollution, high-efficiency, rich-lean combustion gas burner for households using a porous plate organized by porous metal fiber weaving - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a domestic low-pollution / high-efficiency rich / lean combustion gas burner using a porous plate composed of porous metal fiber woven fabric, and more specifically, The burner has a high flame stability and is mainly used as a burner for household gas combustion equipment such as gas boilers.The rich burn slit of the Bunsen type gas burner and the burner's burning surface material are made of porous metal fiber weave. Porous plate (Knitted Metal Fiber)
er Mat) to significantly reduce the emission of pollutants (NOx and CO, etc.) generated during combustion, while premixing the premixed lean burn slits of a low-pollution, high-efficiency premixed gas burner. By alternately arranging lean burn slits and rich burn slits in this order, the stability of premixed lean burn flames with low pollution and high thermal efficiency is enhanced,
The present invention relates to a household low-pollution, high-efficiency rich-lean combustion gas burner that uses a porous plate that significantly reduces emissions of pollutants and has excellent combustibility.

[0002]

2. Description of the Related Art Bunsen gas burners are widely used for gas combustion equipment such as most domestic gas boilers because they have advantages such as flame stability and low risk of flashback. . However, the Bunsen type gas burner is not only structurally long in the flame of the burner and has a high flame temperature, but also because the amount of air required for combustion is greater than the theoretical amount of air, the amount of heat loss due to exhaust of hot exhaust gas is large. The emission of pollutants (NOx, CO, etc.) was large, and there was a limit to maximizing the efficiency of gas combustion equipment and reducing pollutants.

Further, as a method for reducing pollutants (NOx, CO, etc.) and lowering the flame temperature, a porous body composed of a woven porous metal fiber used as a combustion surface material of a gas burner is used. There is a premixed lean burn using a plate, and the porous plate made of porous metal fiber woven fabric used as the combustion surface material of the recently developed premixed lean burn gas burner has a diameter of 50 μm or less. A metallic material woven like a fibrous structure, which is used as the combustion surface material of the gas burner to completely combust combustible premixed gas on the combustion surface, and at the same time, to woven metal fiber with its heat of combustion. By heating the combustion surface of the gas burner, which is a textured porous plate, strong and uniform solid-state radiation energy can be obtained from the combustion surface of the gas burner.

Further, by reducing the amount of excess air for combustion and lowering the temperature of the combustion exhaust gas, the heat loss amount of the exhaust gas is reduced, the thermal efficiency is increased, and the pollutant (N
It has the effect of suppressing the emission amount of Ox, CO, etc., and the combustion load range (turndown ratio: TDR) is much wider than that of the existing general gas combustion equipment (TDR = 5: 1). The flame stability is high and the structure is simple, along with ceramics or stainless steel, for household use to improve the thermal efficiency of gas combustion equipment and reduce pollutants.
It is widely used as a combustion surface material for gas burners for commercial and industrial use.

In particular, among the ceramics, stainless steel, and porous plates having a metal fiber weave structure used as the combustion surface material for gas burners, the material of the porous metal plate having a porous metal fiber weave structure is affected by the heat treatment effect. Since the temperature of the rear surface of the burner is lowered below the ignition temperature, the burner flame does not flow back through the small holes of the porous plate when using it as the combustion surface material of the gas burner to burn the premixed gas. . Therefore, the gas burner using the porous plate structured by the porous metal fiber woven fabric reduces pollutant substances (NOx, CO, etc.) and lowers the flame temperature without the need for additional measures against flashback phenomenon. Is used as a method for.

[0006]

However, in the conventional combustion using a gas burner, since the air supply system required for combustion is the primary system, the air ratio of the primary air is high and the combustion temperature is low. Prompt NOx and Ther
Although the generation of mal NOx can be prevented, the burner flame is unstable when the flame temperature is low, not only the production cost is high, but also the production is difficult, and it is premixed in the domestic gas combustion equipment designed with a simple structure. There was a problem that stable control of lean burn was difficult.

Further, in order to solve the above-mentioned problems, a rich mixture of rich combustion and premixed lean combustion is used.
Although lean-burn gas burners are used, most of the rich-lean gas burners in use today have a complicated structure because the rich-burn slit and the premixed lean-burn slit are all made of stainless steel material. When the combustion air is insufficient, a flashback phenomenon or the like occurs, and further, not only the manufacturing cost is high, but also the manufacturing is difficult.

Therefore, the present invention was devised with this problem in mind, and its purpose is to employ Bunsen combustion and premixed lean combustion to remove pollutants (NOx, CO, etc.). It is an object of the present invention to provide a household low-pollution, high-efficiency rich-lean combustion gas burner that uses a porous plate that is structured by a porous metal fiber woven fabric that has a reduced burner stability and a higher flame stability of the gas burner.

[0009]

In order to achieve the above object, the present invention provides a burner for household gas combustion equipment such as a gas boiler, wherein the burner is a gas nozzle for injecting the fuel introduced through a fuel supply port, As a combustion surface material, a number of Bunsen type rich combustion slits are installed on the burner supporting table so that the gas injected by the gas nozzles may flow into the burner supporting table, and a porous metal plate having a porous metal fiber woven structure is used. The premixed lean combustion slit to be used and the rich fuel slit and the premixed lean combustion slit are installed on one side of the burner support so that one side is in contact with the gas fuel inlet, and the gas fuel inlet is located. A partition plate having holes formed therein so that gas fuel and primary air may flow into each of the gas nozzles, the Bunsen rich combustion slit, and A porous plate composed of a metal fiber woven structure, which includes an air supply plate installed at the lower end of the burner support so as to be located under the mixed lean combustion slit and having a plurality of air openings formed therein. We provide a low-pollution, high-efficiency rich / lean combustion gas burner for home use.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a plan view showing the structural arrangement of the present invention, FIG. 2 is an elevation view of FIG. 1,
FIG. 3 is an illustration showing the structure of the rich combustion slit of the present invention, FIG. 4 is an illustration showing the structure of the premixed lean combustion slit of the present invention, and FIG. 5 is an illustration showing the operation of the present invention.

As shown, the present invention includes a gas nozzle 2 for injecting fuel injected through a fuel supply port 1.
A large number of Bunsen-type rich combustion slits 5 and premixed lean combustion slits 6, which are separately installed on the burner support so that the gas injected by the gas nozzles may flow in, the rich combustion slits 5 and premixed The partition plate 4 installed on the burner support 8 so as to be located between the lean burn slit 6 and the gas nozzle 2, and the burner so as to be located below the Bunsen type rich burn slit 5 and the premix lean burn slit 6. The air supply plate 3 is installed at the lower end of the support base 8.

The many Bunsen type rich combustion slits 5 and the premixed lean combustion slits 6 are provided on a burner support 8
When the Bunsen type rich combustion slit 5 is installed on one side, the premixed lean combustion slit 6 is installed on the one side, and the Bunsen type rich combustion slit 5 is installed on one side of the premixed lean combustion slit 6. It is installed in every other by the method that is done.

Since the porous plate 7 made of a woven porous metal fiber attached to the combustion surface of the premixed lean burn slit 6 is made of a metallic material, both ends of the porous plate 7 are on both sides of the slit 6. One side surface of the slit 6 is connected to the other side surface of the slit 6 via the upper portion of the slit 6 so as to be in contact with the surface. Stick both sides of the plate 7,
Both side surfaces of the slit 6 and both side surfaces 71 of the porous plate 7 are spot-welded, and the porous plate 7 is fixed to the upper portion of the slit 6 so that the mixed gas fuel is not leaked through the both side surfaces of the slit 6. Allow the main flame of the burner to form on the upper surface of 7.

The gas nozzle 2 causes the gas transferred from the fuel supply port 1 to flow into the mixed fuel gas inflow ports 51 and 61 of the slits 5 and 6 installed on the burner support 8, and the kind of slits. The diameter and slits 5 and 6 are installed to maintain a constant distance from the gas fuel inlets 51 and 61. The partition plate 4 includes a burner support base 8
Gas inlets 5 of slits 5 and 6 respectively installed in
The gas fuel inlet port 5 of the slits 5 and 6 is installed on one side of the burner support base 8 so that one side surface comes into contact with the burner support members 1 and 61.
A hole 41 is formed at a position where the 1, 1 are located. That is,
The gas injected by the gas nozzle 2 is supplied to the holes 4 of the partition plate 4.
1 through the slits 5, 6 gas fuel inlets 51, 61
When a gas flows in, a certain amount of air flows into the slit through the gas fuel inlets 51 and 61 together with the gas.

At this time, the hole 41 of the partition plate 4 and the diameter of the gas nozzle 2 and the distance between the gas nozzle 2 and the partition plate 4 are formed and installed differently depending on the types of the slits 5 and 6. That is, the rich combustion slit 5 is separated so that the air ratio required for Bunsen type rich combustion is about 0.4 to 0.6 when the gas is introduced into the gas fuel inlet 51 of the rich combustion slit 5 by the gas nozzle 2. The size of the hole 41 of the plate 4 and the diameter of the gas nozzle 2 are formed so that the gas nozzle 2 and the partition plate 4 can be formed.
Will be installed to maintain a certain distance.

Further, since the premixed lean burn slit 6 is of the primary air supply system, when gas is introduced into the gas fuel inlet 61 of the premixed lean burn slit 6 by the gas nozzle 2, the Bunsen type rich combustion is performed. The required air ratio is about 1.
The distance between the gas nozzle 2 and the partition plate 4 is adjusted by adjusting and forming the diameters of the partition plate hole 41, the mixed gas fuel inlet 61 and the gas nozzle so as to be 4 to 1.7. That is, the gas nozzle 2 has the mixed gas fuel inlet 6 of the premixed lean combustion slit 6.
By injecting fuel into the slit 6 at the central portion of 1, the mixed gas fuel flow of the premixed lean burn slit 6 is such that the surrounding air is uniformly introduced into the premixed lean burn slit 6 at the time of fuel injection. The inlet 61 and the partition hole 41 that contacts the inlet 61 are formed in a circular shape.

The amount of fuel gas and primary air introduced into the premixed lean burn slit 6 through the hole 41 of the partition plate 4 is smoothly formed as a complete premixed gas while flowing through the Venturi tube of the slit and has a constant velocity. Is uniformly ejected through the porous plate 7. The air supply plate 3 has a rich combustion slit 5
And a plurality of air ports 31 are formed at the lower end of the burner support 8 so as to be located below the premixed lean combustion slit 6. At this time, the plurality of air ports 31
Has a primary air ratio for combustion of about 0.4 through the holes 41 of the partition plate 4.
The diameter, position and number of the air ports 31 are easily adjusted / formed so that the remaining secondary air required for combustion flows into the rich combustion slit 5 that has flowed in by about 0.6.

As described above, according to the present invention, the gas fuel supplied through the fuel supply port 1 is injected from the gas nozzle 2,
At this time, the length and diameter of the gas nozzle 2 and the air of the air supply plate 3 are adjusted so that the primary air ratios required for the Bunsen rich combustion and the premixed lean combustion are about 0.4 to 0.6 and about 1.4 to 1.7, respectively. After adjusting the size of the mouth 31, the diameter of the mixed gas fuel inlet 61 of the premixed lean combustion slit 6 that contacts the hole 41 of the partition plate 4, and the premixed lean burn slit, the premixed lean burn slit 5 and the premixed lean burn slit. 6 are alternately arranged in the order of premixed lean burn slits and rich burn slits. That is, by lowering the flame temperature of the gas burner, Prompt NOx and Thermal
In order to stabilize the unstable flame of the premixed lean combustion itself, which is designed to reduce the production of NOx, the premixed lean burn slit 6 is provided with the Bunsen type rich combustion slit 5 in which the flame is alternately and alternately stabilized. A gas burner having stable flame, excellent combustibility, and low emission of pollutants (NOx, CO, etc.) was constructed. In particular, the mixed gas fuel inlet 61 and the partition plate hole 41 in contact therewith so that all the combustion air is more smoothly introduced by the primary air only through the slit 6 of the premixed lean combustion which is the primary air supply system. The shape is circular.

Further, due to the stable flame shape of the rich / lean combustion gas burner, the combustion air required for the Bunsen type rich combustion and the premixed lean combustion is a mixed gas fuel inlet at each slit of the Bunsen type rich combustion. The primary air ratio for combustion is properly flowed in through the holes formed in the partition plate 4 of about 0.4 to 0.6, and the rest is slit 5 and slit 6.
The size and number of the air ports 31 of the air supply plate 3 are adjusted so that the secondary air for combustion flows in through the space between and.

Further, the premixed lean burn slit 6 is
Circular diaphragm hole 41 and slit mixed gas fuel inlet 6
1, the air ratio required for premixed lean combustion is about 1.4 ~
Since all the combustion air of about 1.7 flows in with only the primary air and performs the premixed lean combustion, no air port is formed in the air supply plate 3 located below the premixed lean combustion slit 6.

Further, in the premixed lean burn gas burner using the porous plate structured by the metal fiber weave, air having a higher air ratio is introduced into the primary side as compared with the conventional Bunsen type gas burner. However, when the air supply decreases, the flame length becomes longer and the flame of the gas burner contacts the heat exchanger when the same combustion chamber is used.
When O is generated, the heat input amount of the gas fuel and the inflow amount of the combustion air are appropriately adjusted to achieve an optimum combustion state.

As described above, in all cases, the combustion air supplied from the blower is partially supplied with secondary air from the air supply plate 3 due to the insufficient air supply of the Bunsen type gas burner, and the remaining air. The primary air for combustion is introduced through the holes 41 of the partition plate 4 and the mixed gas fuel inlet port, and the combustion air and the fuel gas are mixed at a constant ratio, respectively. It is designed so that a uniform supply is realized, the flame of the burner is stabilized, and the ejection velocity distribution of the mixed gas fuel is maintained constant.

The air and the fuel gas flowing into the gas fuel inlets 51 and 61 are mixed while passing through the venturi pipes of the slits 5 and 6, and the mixed gas is mixed in the upper portion of the rich combustion slit 5. The long main flame flame hole 52 and auxiliary flame flame hole 53 formed, and the porous plate 7 disposed above the premixed lean combustion slit 6 are discharged and ignited by a separately installed ignition device (not shown). It

Although the preferred embodiments of the present invention have been described in detail above, those skilled in the art to which the present invention pertains have the spirit and scope of the present invention defined in the claims. The present invention can be variously modified or changed without departing from the present invention.

[0025]

As described above, according to the present invention, the Bunsen type rich combustion slit and the premixed lean combustion slit are installed at different numbers to reduce the pressure drop and the heat loss, and the stability and uniformity of the burner flame and the flame transition. In addition to the improved properties, the shape and structure of the gas burner is simple, and flashback does not occur during combustion, and workability is easy.

In addition, the general performance of the burner is greatly improved, the flame is stabilized, and the combustion noise generated during combustion is also greatly reduced, so that pollutants (NOx, CO, etc.) can be reduced. . Further, the slit for executing the rich combustion according to the present invention is not limited to the conventional Bunsen type slit, which is manufactured at a low cost and has a simple structure, and is used as it is because the primary air ratio is about 0.4 to 0.6. The slit for performing the mixed lean combustion is the primary air supply system so that the primary air ratio is about 1.4 to 1.7.
The gas fuel inlet of the premixed lean burn slit and the hole of the partition plate contacting it are formed in a circular shape having the same diameter, and the size and position of the air inlet of the air supply plate, the length and diameter of the gas nozzle, The size of the plate hole, the diameter of the gas fuel inlet of the premixed lean burn slit, and the diameter of the partition plate hole in contact with it are easy to manufacture, and the cost is low and the economy is improved. There is an effect that the performance is improved.

When the combustion air or the fuel gas is deflected to one side and flows, the equivalence ratio of each part is different and the flame on the burner surface is also deflected to deteriorate the combustion performance of the burner. The fuel and air are thoroughly mixed in the Venturi tube of each slit so that the flow of the mixed gas is not deflected in the shortest length and narrow space.

Further, in the combustor using the premixed gas,
If the burner has a perforated combustion surface, the burner combustion surface material is partially perforated on ceramics or stainless steel to induce high-load combustion per unit area. Although noise was generated during combustion by using it, in the present invention, the ejection velocity distribution of the fuel gas from the combustion surface of the burner is used by using a porous plate composed of porous metal fiber weave as the combustion surface material of the burner. It has the effect of keeping it constant.

[Brief description of drawings]

FIG. 1 is a plan view showing a structural arrangement of the present invention.

FIG. 2 is an elevational view of FIG.

FIG. 3 is an exemplary view showing a structure of a rich combustion slit according to the present invention.

FIG. 4 is an exemplary view showing a structure of a premixed lean burn slit according to the present invention.

FIG. 5 is an exemplary diagram for explaining an operation according to the present invention.

[Explanation of symbols]

1 Fuel supply port 2 gas nozzles 3 Air supply plate 4 partitions 5 Rich burning slit 6 Premixed lean burn slit 7 Porous plate 8 burner support 31 Air port 41 holes 51 Rich fuel slit gas fuel inlet 52 Flame hole 53 Auxiliary flame hole 61 Premixed lean burn slit gas fuel inlet 71 Both sides of porous plate

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Pak In-Suk Republic of Korea Daejeon Situ Chung Oryu Dong 175-1 Samsung Apartment 28 -1309 (72) Inventor Chee Kw Seung Republic of Korea Dae Jung Si Yu Sung Chun Oung Dong 99 Han Bit Apart 123-603 (56) References JP-A-7-190359 (JP, A) JP-A-10-176806 (JP, A) JP-A-8-226617 (JP, A) JP-A-8-278006 (JP, A) Kaihei 4-190007 (JP, A) JP 10-68507 (JP, A) JP 2000-213714 (JP, A) JP 2001-74209 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23D 14/02-14/18 F23C 11/00

Claims (2)

(57) [Claims] 1. A domestic gas combustor such as a gas boilerVessel
BaIn the tuner, Burn Gas nozzles that inject fuel injected through the fuel supply port
And So that the gas injected by the gas nozzle is introduced
In the burner support stand, a number of
Zen type rich burning slit, Combusting a porous plate organized by metal fiber weave that is porous
Premixed lean burn slit used for surface material, Gas of the rich burn slit and the premixed lean burn slit
Burner support so that one side contacts the fuel inlet
A part installed on one side of the platform where the gas fuel inlet is located
The gas fuel and the primary air flow into each of the gas nozzles.
And a partition plate with holes formed so that Bunsen type rich burn slit and premixed lean burn
Lower edge of burner support so that it is located at the bottom of the slit
Installed in the department,Flow secondary air through the rich burn slit
To enterAir supply with multiple air openingsBoard
WhenPorous metal fiber woven structure characterized by containing
Low-pollution / high-efficiency rich for home using the porous plate
-Lean combustion gas burner. 2. The porous metal according to claim 1, wherein the gas fuel inlet of the premixed lean burn slit and the hole of the partition plate contacting the inlet are formed in a circular shape having the same diameter. A low-pollution, high-efficiency, rich-lean combustion gas burner for home use that uses a porous plate constructed by fiber weaving.