JP3035717B2 - Distributed flame type low NOx gas burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a low NOx burner for achieving low NOx combustion by a burner device itself.

[0002]

2. Description of the Related Art A conventional low NOx gas burner is disclosed in Japanese Utility Model Publication No. Sho 60-30568, for example, in which a fuel injection port is surrounded by a burner front view, and a katakana-shaped air injection port is provided to form an over-concentration diffusion flame nozzle. Below, a grid-like straightening plate is provided in a front view, a lean mixing chamber and two fuel ejection nozzles are provided behind it, and one set of burners is provided. A plurality of similar burner sets are sequentially arranged below this set. This is the only low NOx burner device. In this set, it is necessary to control the fuel supply amount for each of the three fuel ejection nozzles. Therefore, there is a problem in that a change in the fuel supply to each fuel ejection nozzle must be controlled each time the load changes to a low load or a high load. Also, one set of burners is a fuel fuel jet,
Low NO can be achieved by connecting several sets in order to form a light and dark flame
There is also a problem that it cannot be an x-burning device.

[0003]

By operating one valve of the gas fuel supply line without operating a plurality of valves each time the load of the burner is changed, a single gas supply pipe itself can be connected to a plurality of air. It is an object of the present invention to propose a structure of a burner device which can obtain a flow of a rich and lean combustion gas mixed with a combustion gas (hereinafter, simply referred to as a rich gas flow and a light gas flow) to form a dispersed flame for low NOx.

[0004]

According to the present invention, a plurality of partitioned fuel gas supply sections are formed corresponding to a plurality of flow paths formed by a partition member of one fuel gas supply section, and the fuel gas supply section is provided. The number and diameter of a plurality of holes as gas nozzles are adjusted according to the gas concentration of the stream, and the holes are alternately located.
5/9 A light gas flow is formed, and a flame holding member for flame holding is provided at the furnace side end of the burner device.

[0005]

Embodiment 1 FIGS. 1 (a) and 1 (b), a partial perspective view (c)
The first embodiment will be described with reference to FIG. The gas burner device 1 is provided with a gas supply pipe 2 and a gas header 4 having gas burner nozzles 3a, 3b, 3c each having a plurality of gas ejection holes, the axes of which are orthogonally connected. In the illustrated example, the gas header 4 has two partition plates 5 whose plate surfaces are parallel to the axis of the gas supply pipe and whose plate surfaces are orthogonal to the vertical separation plate 8, and the vertical separation plate 8 is shown in FIG. In b), the flow is separated into right and left. In FIG. 1A, two partition plates 5 are provided so as to be connected to each other by forming three upper and lower passages. In the illustrated example, a total of six gas and air mixed gas flow paths are formed. Becomes (The partition plate and the vertical separation plate are referred to as partition members.) A flame holding plate 6 is provided at the furnace side end of the vertical separation plate.
Are connected to each other, and a plurality of cut grooves are provided on the peripheral edge of the flame holding plate, and a large number of small eddies are formed on the furnace side of the flame holding plate to make the flame holding effect effective. In addition, the gas header 4 is provided with a plurality of gas nozzle holes having different numbers of holes and different hole diameters corresponding to the flow paths formed by the partition plate 5 and the vertical separation plate 8, and the total hole area of each of them is calculated. Thus, a dense gas flow path can be formed. As a result, a flow of a mixed gas of fuel gas and air that alternates between rich and light is obtained,
This makes it possible to burn Ox in one burner device. Further, with such a configuration, low-NOx combustion can be obtained by dispersing the dispersed flames having a constant mixture ratio at all times in the load range during combustion in a distributed flame.

Embodiment 2 A second embodiment will be described with reference to FIG. 2 (a) and FIG. 2 (b) which is a sectional view taken along line II of FIG. In this embodiment, the burner opening is circular. Therefore, in order to form a concentrated gas flow of the fuel gas and the air gas in the present invention, as shown in the figure, a plurality of partition plates 10 extend radially inward from the center of the circular cross section toward the inside of the ring-shaped gas header and are connected thereto. ing. A plurality of flow passage spaces having a substantially triangular cross section are provided in the flow passage by this partition plate.
6/9 is formed. A plurality of gas nozzle holes are formed so as to face the respective flow path spaces, and the total diameter of the plurality of gas nozzle holes is determined so as to form a concentrated gas flow corresponding to the respective flow path spaces. Also, a circular flame holding plate 12 supported by a flame holding plate moving shaft 13 is located near the furnace side opening of the burner device. A plurality of cut grooves are formed on the outer peripheral edge of the flame holding plate in the same manner as in the first embodiment to enhance the flame holding effect. Since gas is used as the fuel, a wire net 14 for the flame arrestor is provided on the upstream side for the air flow of the partition plate of the burner, and a wire mesh 15 for mixing the fuel gas is provided on the furnace side. In order to maintain the flow rate and to form the long and short flames when controlling the flow rate of the mixed gas of the fuel when the load is increased or decreased, the adjustment block 16 on the periphery of the burner opening, the flame holding plate 12 and the shaft 13 for moving the flame holding plate are provided. An adjustment block 17 is provided at the connection.

Third Embodiment FIG. 3 (a) shows an example of an apparatus which enables low-load operation in the second embodiment. A plurality of adjusting plates 18 are provided near the furnace side end as shown in FIG.
8a has a plate portion extending further outward from the passage wall than the passage wall, and a gap 22 between the outer peripheral edge of the flame holding plate can be adjusted by a combination of an annular moving block 19, a motor 20 driving the same, and a screw shaft 21. The flame pattern can be changed between a long flame and a short flame according to the increase and decrease of the load. It should be noted that the frame pattern can be changed for a passage having a rectangular cross section by a similar mechanism.

Embodiment 4 In place of the adjustment plate of Embodiment 3 (a), fixed adjustment blocks 16 and 17 shown in FIG. 2 (a) are provided, and the frame pattern is changed by operating the shaft 13 for moving the flame holding plate. Changes can be made.

Fifth Embodiment FIG. 4A shows a case in which a large-capacity gas header 27 is used, and fuel gas supply pipes 28 are respectively connected to upper and lower ends of the gas header.

[Embodiment 6] FIG. 4 (b) shows a case in which a larger capacity is used, in which a plurality of (three in the illustrated example) gas headers 30 are used. The upper end is an upper header 29u and the lower end is a lower header 29u.
d and reference number P203G-7
7/9 This is the case where each is connected. Fuel gas supply pipes 32 are connected to left and right ends of the upper and lower headers, respectively.

[Embodiment 7] In FIG. 4B, the nozzle hole of each header is formed by changing the hole diameter and the number thereof in the direction of the axis of the header to form a rich fuel gas flow by a partition plate. In the sixth embodiment, the gas header according to the sixth embodiment is such that a concentrated gas header 31, a light gas header 32, and a concentrated gas header 33 are provided in parallel, and a low NOx combustion and a large capacity are similarly enabled.

[0006]

According to the present invention, a distributed flame having a constant mixture ratio of light and shade is generated alternately by merely controlling the gas fuel supply amount by an adjusting valve provided in one fuel supply pipe, and In this case, it is possible to obtain a preferable long and short flame when increasing / decreasing the temperature and to effect a suitable low NOx gas combustion.

[Brief description of the drawings]

FIG. 1 (a) is a side sectional view of an apparatus according to a first embodiment of the present invention.

FIG. 1 (b) is a cross-sectional plan view of the device according to the first embodiment.

FIG. 1C is a partial perspective view including the gas header 4 of FIG.

FIG. 2 (a) is a longitudinal sectional view of the device of the second embodiment.

FIG. 2 (b) is a perspective view taken along a line II in FIG. 2 (a).

FIG. 3 is a partial cross-sectional view of an apparatus including an adjustment plate that enables low-load operation. You. Reference number P203G-8
8/9

FIG. 4 (a) is a partial view of a large-capacity gas header.

FIG. 4 (b) is a partial perspective view of an apparatus in which a plurality of gas headers 30 are connected at their upper and lower ends by respective headers to further increase the capacity.

FIG. 4 (c) is a perspective view of a large-capacity low-NOx combustion apparatus in which a concentrated gas header, a light gas header, and a concentrated gas header and a gas header are arranged in parallel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas burner apparatus 2 Gas supply pipe 4 Gas header 4a Gas nozzle hole 5 Partition plate 6 Flame holding plate 6a Stabilizing plate 7a Flow path 7b Flow path 8 Vertical separation plate 11 Gas header 12 Flame holding plate 13 Flame holding plate moving shaft 18 Adjustment plate 25 Damper 26 Valve 27 Gas header 30 Gas header

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kinji Matsumoto 1-2-10 Isogo, Isogo-ku, Yokohama, Kanagawa Prefecture Inside Bab Hitachi Engineering Services Co., Ltd. No. 2 Bab Hitachi Engineering Services Co., Ltd. (72) Inventor Fumio Koda 6-9 Takaracho, Kure City, Hiroshima Prefecture Bab Kotsuk Hitachi Ltd. Kure Factory (56) References JP-A-4-126906 (JP, A ) Japanese Utility Model 52-167633 (JP, U) Japanese Utility Model 59-29506 (JP, U) Japanese Utility Model Application Hei 4-73713 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23C 11/00 329 F23D 14/02

Claims (5)

(57) [Claims] 1. A gas header of one burner device is provided with a plurality of gas burner nozzles having different fuel gas supply amounts, and a rich gas flow path and a light gas flow path are alternately positioned corresponding to the gas burner nozzles. Providing a partition member that forms a dispersed flame,
A distributed flame type low NOx gas burner characterized in that a flame holding plate is provided at the furnace side end of the burner device. 2. A combustion air passage having a rectangular cross section,
A gas header having a plurality of gas burner nozzles with different numbers and diameters of gas nozzle holes is positioned in parallel with the long axis of the rectangular cross section, and a plurality of partition members for partitioning between the gas burner nozzles are provided to provide a plurality of air. 2. The dispersion according to claim 1, wherein a mixed gas flow path with the combustion gas is formed, and a concentrated gas flow path and a light gas flow path are alternately positioned in the gas flow path to form a dispersed flame. Flame type low NOx gas burner. 3. A plurality of partition plates extending radially from a ring center of a ring-shaped gas header for supplying a fuel gas to a wall of the gas ring are provided to form a plurality of flow passage spaces, and each of the flow passage spaces faces the respective flow passage space. A plurality of gas nozzle holes having different diameters and numbers are provided in the gas header and mixed with air to form a dispersed flame in which rich gas flow passages and light gas flow passages are alternately located. Item 4. The dispersed flame type low NOx gas burner according to Item 1. 4. A flame pattern changing means for driving a long flame and a short flame provided with a drive unit for adjusting a distance between a peripheral edge of the flame holding plate and a furnace side end of the plurality of movable pieces. Item 4. The distributed flame type low NOx burner device according to any one of Items 1 to 3. 5. A fixed adjustment block comprising an adjustment block provided at a furnace side end of a burner device and an adjustment block provided at a connection between a flame holding plate and a shaft for moving the flame holding plate. The distributed flame type low NOx gas burner according to any one of claims 1 to 3, characterized in that: Reference number P203G-4
4/9