JP3402928B2 - Low NOx gas combustion device - Google Patents

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、ガス給湯機、ガス
温水暖房機等に使用され、ＮＯｘの発生量を低減させた
低ＮＯｘガス燃焼装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low NOx gas combustion apparatus which is used in a gas water heater, a gas water heater, etc. and which reduces the amount of NOx generated.

【０００２】[0002]

【従来の技術】従来のこの種のガス燃焼装置において
は、例えば、特開平６−３３１１１０号公報に開示され
ているように、頂部に主炎孔を有する主体の両側壁に、
これらの両側壁と保炎空間を保って一対の保炎板が立設
された袖火タイプのバーナ体を備えている。そして、こ
のように構成されたバーナ体を、バーナケース内に相互
に通気間隔を存して複数並設し、バーナ体にやや希薄な
混合ガスを供給するとともに、バーナ体に供給する混合
ガスよりも更に希薄な希薄混合ガスをバーナ体間の通気
間隔に供給して、この通気間隔の上方並びにバーナ体の
上方で希薄混合ガス多段燃焼させることにより、ＮＯｘ
の発生量を低減させていた。2. Description of the Related Art In a conventional gas combustion apparatus of this type, for example, as disclosed in JP-A-6-331110, on both side walls of a main body having a main flame hole at the top,
It has a sleeve-fire type burner body in which a pair of flame-holding plates are erected while keeping the side walls and the flame-holding space. Then, a plurality of burner bodies configured in this way are arranged side by side in the burner case with a mutual ventilation interval, and while supplying a slightly diluted mixed gas to the burner body, Further, the lean mixed gas is supplied to the ventilation interval between the burner bodies, and the lean mixed gas is burned in multiple stages above this ventilation interval and above the burner body to generate NOx.
Was reduced.

【０００３】[0003]

【発明が解決しようとする課題】ところで、上述した従
来構造のガス燃焼装置では、希薄混合ガスの流出部とな
るバーナ体間の通気間隔の上部開放面、即ち、隣接する
バーナ体の保炎板間の隙間の面積が大きいため、バーナ
体間の通気間隔を流れる二次空気量が突発的に減少した
り、バーナ体間の通気間隔を流れガス量が突発的に増加
したりすると、希薄混合ガス状態が崩れて引火しやすい
混合ガスとなり、通気間隔の上方並びにバーナ体の上方
に形成される火炎が、バーナ体間の通気間隔に引き込ま
れ、逆火を生じる問題があった。また、着火時におい
て、着火遅れが生じた場合でも、同様に逆火を生じる問
題があった。By the way, in the above-described conventional gas combustion apparatus, the upper open surface of the ventilation interval between the burner bodies, which is the outflow portion of the lean mixed gas, that is, the flame holding plate of the adjacent burner bodies is used. Since the area of the gap between them is large, if the amount of secondary air flowing through the ventilation interval between the burner bodies suddenly decreases, or if the amount of gas that flows through the ventilation interval between the burner bodies suddenly increases, lean mixing occurs. There is a problem in that the gas state collapses to form a mixed gas that easily ignites, and the flames formed above the ventilation interval and above the burner body are drawn into the ventilation interval between the burner bodies, causing flashback. Further, at the time of ignition, even if there is a delay in ignition, there is a problem that flashback occurs similarly.

【０００４】本発明は、上述の実情に鑑みてなされたも
のであり、バーナ体間の通気間隔を流れるガス量の突発
的な変動や、着火時での着火遅れに起因する逆火の発生
を防止し、安定した低ＮＯｘ燃焼が行われるようにする
ことを目的としている。The present invention has been made in view of the above situation, and it is possible to prevent a sudden change in the amount of gas flowing in the ventilation interval between burner bodies and a backfire due to ignition delay during ignition. The purpose is to prevent this and to perform stable low NOx combustion.

【０００５】[0005]

【課題を解決するための手段】請求項１に記載の本発明
では、頂部に主炎孔を有する主体の両側壁上部に袖火用
孔を設けるとともに、この袖火用孔と対向する立壁を有
する一対の保炎板を設けたバーナ体を備え、このバーナ
体を相互に通気間隔を存してバーナケース内に複数並設
し、これらバーナ体間の通気間隔には、前記バーナ体に
供給する混合ガスよりも希薄な希薄混合ガスが供給され
るガス燃焼装置において、前記バーナ体には、前記保炎
板の根本部よりも上流側となる主体の両側壁に、前記バ
ーナ体間の通気間隔に向けて混合ガスを噴出する混合ガ
ス噴出孔を設け、前記バーナ体の隣接する保炎板間に
は、多数の副炎孔を副炎孔形成面に有する副炎孔板を架
設し、さらに、前記混合ガス噴出孔よりも上流側の通気
間隔内には通気抵抗板を設けるとともに、前記副炎孔板
の副炎孔形成面と通気抵抗板との間にはハニカム形成体
にて成る整流部材を設けた構成である。According to the present invention as set forth in claim 1, a sleeve fire hole is provided in an upper portion of both side walls of a main body having a main flame hole at the top, and a standing wall facing the sleeve fire hole is provided. The burner body is provided with a pair of flame holding plates, and a plurality of the burner bodies are arranged side by side in the burner case with a mutual ventilation interval, and the burner body is supplied to the burner body at the ventilation interval between the burner bodies. In the gas combustor in which a lean mixed gas that is leaner than the mixed gas is supplied, the burner body is provided with ventilation between the burner bodies on both side walls of the main body upstream of the root portion of the flame holding plate. A mixed gas spouting hole for spouting the mixed gas toward the space is provided between the flame holding plates of the burner body adjacent to each other.
Mounts a secondary flame hole plate that has a large number of secondary flame holes on the secondary flame hole formation surface.
And further ventilating upstream of the mixed gas ejection hole.
A ventilation resistance plate is provided in the space, and the auxiliary flame plate
The honeycomb forming body is formed between the sub flame hole forming surface and the ventilation resistance plate.
It is the structure which provided the straightening member which consists of.

【０００６】請求項２に記載の本発明では、頂部に主炎
孔を有する主体の両側壁上部に袖火用孔を設けるととも
に、この袖火用孔と対向する立壁を有する一対の保炎板
を設けたバーナ体を備え、このバーナ体を相互に通気間
隔を存してバーナケース内に複数並設し、これらバーナ
体間の通気間隔には、前記バーナ体に供給する混合ガス
よりも希薄な希薄混合ガスが供給されるガス燃焼装置に
おいて、前記バーナ体には、前記保炎板の根本部よりも
上流側となる主体の両側壁に、前記バーナ体間の通気間
隔に向けて混合ガスを噴出する混合ガス噴出孔を設け、
前記バーナ体の隣接する保炎板間には、多数の副炎孔を
副炎孔形成面に有する副炎孔板を架設し、さらに、前記
混合ガス噴出孔よりも上流側の通気間隔内には複数のス
リットを穿った通気抵抗板を設けるとともに、この通気
抵抗板のスリットの総開口面積を前記副炎孔板の副炎孔
の総開口面積以下に設定し、かつ、前記副炎孔板の副炎
孔形成面と通気抵抗板との間にはハニカム形成体にて成
る整流部材を設けた構成である。According to the second aspect of the present invention, a sleeve fire hole is provided in the upper part of both side walls of the main body having a main flame hole at the top, and a pair of flame holding plates having standing walls facing the sleeve fire hole. A plurality of burner bodies are provided side by side in the burner case with a mutual ventilation interval, and the ventilation interval between the burner bodies is less than that of the mixed gas supplied to the burner body. In the gas combustion apparatus to which a lean mixed gas is supplied, the burner body is provided on both side walls of the main body upstream of the root portion of the flame holding plate, and the mixed gas is directed toward the ventilation interval between the burner bodies. A mixed gas ejection hole for ejecting
An auxiliary flame hole plate having a large number of auxiliary flame holes on the auxiliary flame hole forming surface is provided between adjacent flame holding plates of the burner body, and further within the ventilation interval on the upstream side of the mixed gas ejection hole. Is more than one
Rutotomoni provided ventilation resistance plate bored with slits, the ventilation
The total opening area of the slit of the resistance plate is defined as the auxiliary flame hole of the auxiliary flame hole plate.
Of the secondary flame of the secondary flame hole plate
A honeycomb forming body is formed between the hole forming surface and the ventilation resistance plate.
A rectifying member is provided .

【０００７】[0007]

【０００８】請求項１の低ＮＯｘガス燃焼装置において
は、バーナ体には、保炎板の根本部よりも上流側となる
主体の両側壁に、バーナ体間の通気間隔に向けて混合ガ
スを噴出する混合ガス噴出孔を設けた構成としているの
で、通気間隔からは、混合ガス噴出孔から噴出するやや
希薄な混合ガス（空気比が１．０〜１．３）と、通気間
隔の下方部から送られてくる超希薄混合ガス（空気比が
１．８〜２．５）とが混合した希薄混合ガス（空気比が
１．５〜２．２）を流出させて希薄混合ガス多段燃焼を
行わせることができる。従って、混合ガス噴出孔よりも
下方部の通気間隔を流れる希薄混合ガスは、ガス濃度が
従来よりも更に希薄化され、バーナ体間の通気間隔を流
れる混合気体のガス量が突発的に変動したり、着火時に
着火遅れが生じた場合でも、逆火しにくくなる。In the low NOx gas combustion apparatus of the first aspect, the burner body is provided with the mixed gas on both side walls of the main body upstream of the root portion of the flame holding plate toward the ventilation interval between the burner bodies. Since the mixed gas jet holes for jetting are provided, from the ventilation interval, the slightly diluted mixed gas (air ratio is 1.0 to 1.3) jetted from the mixed gas jet holes and the lower part of the ventilation interval. The lean mixed gas (air ratio of 1.5 to 2.2) mixed with the ultra lean mixed gas (air ratio of 1.8 to 2.5) sent from Can be done. Therefore, the lean mixed gas flowing through the ventilation interval below the mixed gas ejection hole has a gas concentration more diluted than before, and the gas amount of the mixed gas flowing through the ventilation interval between the burner bodies suddenly fluctuates. Or, even if there is a delay in ignition at the time of ignition, it will be difficult to flash back.

【０００９】また、バーナ体の隣接する保炎板間に多数
の副炎孔を副炎孔形成面に有する副炎孔板を架設したこ
とにより、副炎孔板に穿った複数の副炎孔によって、希
薄混合ガス噴出用の炎孔面積を狭ばめるなど、適宜調整
可能となり、通気間隔内への逆火が一層抑制されるばか
りでなく、混合ガス噴出孔よりも上流側の通気間隔内に
は通気抵抗板を設けた構成としているので、この通気抵
抗板の働きで、副炎孔板近くの通気間隔の内圧を低下さ
せることができ、バーナ体に設けた混合ガス噴出孔から
の混合ガスの流出を促進させることが可能となる。さら
に、副炎孔板の副炎孔形成面と通気抵抗板との間にはハ
ニカム形成体にて成る整流部材が設けられていて、通気
抵抗板通過後の希薄混合ガスの整流効果が得られる。 Further, since the auxiliary flame hole plate having a large number of auxiliary flame holes on the auxiliary flame hole forming surface is provided between the adjacent flame holding plates of the burner body, a plurality of auxiliary flame holes formed in the auxiliary flame hole plate is provided. This makes it possible to adjust the flame hole area for jetting the lean mixed gas, such as by narrowing the area, so that not only the flashback within the ventilation interval can be further suppressed, but also the ventilation interval on the upstream side of the mixed gas injection hole. Since the ventilation resistance plate is provided inside, it is possible to reduce the internal pressure of the ventilation interval near the auxiliary flame hole plate by the function of this ventilation resistance plate, and from the mixed gas ejection holes provided in the burner body. It is possible to accelerate the outflow of the mixed gas. Furthermore
In addition, there is a gap between the surface of the secondary flame hole plate where the secondary flame hole is formed and the ventilation resistance plate.
A rectifying member consisting of a nicam forming body is provided for ventilation.
A rectifying effect of the diluted mixed gas after passing through the resistance plate can be obtained.

【００１０】請求項２の低ＮＯｘガス燃焼装置において
は、通気抵抗板のスリットの総開口面積を前記副炎孔板
の副炎孔の総開口面積以下に設定したことにより、スリ
ットから流出する通気抵抗板近くの希薄混合ガスの流速
を増加させることができ、通気間隔下方部への逆火をよ
り確実に防止し得る。In the low NOx gas combustion apparatus according to the second aspect of the present invention, since the total opening area of the slits of the ventilation resistance plate is set to be equal to or less than the total opening area of the auxiliary flame holes of the auxiliary flame hole plate, the ventilation gas flowing out from the slits is discharged. The flow velocity of the lean mixed gas near the resistance plate can be increased, and the flashback to the lower part of the ventilation interval can be prevented more reliably.

【００１１】[0011]

【発明の実施の形態】以下、本発明の一実施形態例を図
１ないし図５の図面に基づいて説明する。図１ないし図
５において、１は送風機、２は送風機１から燃焼用空気
が送り込まれる外郭ケース、３は外郭ケース２内に収容
されたバーナケースであり、このバーナケース３内に
は、通気間隔としての二次空気通路４、４を設けて６本
のバーナ体５、５を並設している。前記バーナケース３
は、それの中間部に立設した仕切壁３Ａによって左右に
２分割され、これら左右の部屋Ｘ、Ｙには前記バーナ体
５、５がそれぞれ３本ずつ収容されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings of FIGS. 1 to 5, 1 is a blower, 2 is an outer casing to which combustion air is sent from the blower 1, and 3 is a burner case housed in the outer casing 2. In the burner case 3, a ventilation interval is provided. The secondary air passages 4 and 4 are provided, and the six burner bodies 5 and 5 are arranged in parallel. The burner case 3
Is divided into two left and right by a partition wall 3A provided upright in the middle thereof, and three burner bodies 5 and 5 are accommodated in the left and right chambers X and Y, respectively.

【００１２】前記バーナ体５、５は、内部に混合室６が
形成された主体５Ａの頂部の主炎孔形成面７に多数のス
リット状の主炎孔８、８を設けている。そして主体５Ａ
の左右両側壁の上部には、側壁と保炎空間イ、イを保っ
て左右一対の保炎板９、９が立設されている。The burner bodies 5, 5 are provided with a large number of slit-shaped main flame holes 8, 8 on the main flame hole forming surface 7 at the top of the main body 5A in which the mixing chamber 6 is formed. And subject 5A
A pair of left and right flame holding plates 9 and 9 are erected on the upper portions of the left and right side walls while keeping the side walls and the flame holding spaces a and b.

【００１３】前記保炎空間イ、イには、前記混合室６に
供給された混合ガスの一部が主体５Ａの左右両側壁の上
部に穿った袖火用孔１０、１０を通って入り込み、この
入り込んだ混合ガスは保炎空間イ、イを上昇して流出
し、保炎空間イ、イ上に袖火が形成されるようになって
いる。また、前記各保炎板９、９は、前記袖火用孔１０
に対向する立壁９Ａ、この立壁９Ａの下端部に設けられ
た傾斜状の根本部９Ｂ、及び主体５Ａに当接する当接部
９Ｃを有し、前記立壁９Ａの上端が前記主炎孔形成面７
よりも約２〜４ｍｍ低くなるようにその高さが設定され
ている。また、前記バーナ体５には、図３及び図４に示
すように、保炎板９の根本部９Ｂよりも上流側となる主
体５Ａの左右両側壁（保炎板９の当接部９Ｃとの重なり
部分）に、前記二次空気通路４に向けてバーナ体５の混
合室６に供給された混合ガスの一部を噴出させる複数の
混合ガス噴出孔１１、１１を、適宜の間隔を存して横並
びに穿っており、これら複数の混合ガス噴出孔１１、１
１は、径が約１ｍｍに設定されている。A part of the mixed gas supplied to the mixing chamber 6 enters the flame holding spaces a and b through the sleeve fire holes 10 and 10 formed in the upper portions of the left and right side walls of the main body 5A, The mixed gas thus entered rises out of the flame holding spaces a and b and flows out to form sleeve fires on the flame holding spaces a and b. Further, the flame holding plates 9 and 9 have the sleeve fire holes 10 respectively.
Has a standing wall 9A, an inclined root portion 9B provided at a lower end portion of the standing wall 9A, and an abutting portion 9C that abuts the main body 5A, and the upper end of the standing wall 9A has the main flame hole forming surface 7
The height is set to be about 2 to 4 mm lower than that. Further, as shown in FIGS. 3 and 4, the burner body 5 has both right and left side walls of the main body 5A (the contact portions 9C of the flame retaining plate 9 and the upstream side of the root portion 9B of the flame retaining plate 9). A plurality of mixed gas ejection holes 11, 11 for ejecting a part of the mixed gas supplied to the mixing chamber 6 of the burner body 5 toward the secondary air passage 4 at appropriate intervals. And a plurality of these mixed gas ejection holes 11 and 1 are formed side by side.
1 has a diameter set to about 1 mm.

【００１４】前記各バーナ体５の混合室６には空気比が
約１〜１．３のやや希薄な混合ガスが供給され、また、
各バーナ体５、５間の二次空気通路４、４内の下方部分
には、バーナ体５の混合室６に供給される混合ガスより
も更に希薄な希薄混合ガスがそれぞれ供給されるように
なっている。そして、この二次空気通路４、４に供給さ
れる希薄混合ガスの空気比は通常で約１．８〜２．５で
ある。The mixing chamber 6 of each burner body 5 is supplied with a slightly diluted mixed gas having an air ratio of about 1 to 1.3, and
The lean mixed gas, which is much leaner than the mixed gas supplied to the mixing chamber 6 of the burner body 5, is supplied to the lower portions of the secondary air passages 4 and 4 between the burner bodies 5 and 5, respectively. Has become. The air ratio of the lean mixed gas supplied to the secondary air passages 4 and 4 is usually about 1.8 to 2.5.

【００１５】前記バーナ体５の隣接する保炎板９、９間
には、断面略コ字状に形成された副炎孔板１２、１２が
それぞれ着脱可能に架設してある。この副炎孔板１２
は、図１及び図３に示すように、希薄混合ガス噴出用の
スリット状や円形状の適宜な形状の副炎孔１３、１３を
その長手方向に多数穿った副炎孔形成面１２Ａと、この
副炎孔形成面１２Ａの両縁から下向きに折り曲げられた
左右の側片１２Ｂ、１２Ｃとを有し、これら両側片１２
Ｂ、１２Ｃを前記保炎板９、９の立壁９Ａ、９Ａに外嵌
合することにより、保炎板９の上方から抜き差し自在に
保炎板９に取り付けられるものである。Between the flame holding plates 9 and 9 adjacent to each other in the burner body 5, auxiliary flame hole plates 12 and 12 each having a substantially U-shaped cross section are detachably installed. This secondary flame hole plate 12
As shown in FIGS. 1 and 3, a sub-flame hole forming surface 12A in which a large number of sub-flame holes 13 having a slit shape or a circular shape for jetting a lean mixed gas are formed in the longitudinal direction, Left and right side pieces 12B and 12C bent downward from both edges of the auxiliary flame hole forming surface 12A are provided.
By externally fitting B and 12C to the standing walls 9A and 9A of the flame holding plates 9 and 9, the flame holding plates 9 are attached to the flame holding plate 9 so as to be freely inserted and removed from above.

【００１６】前記副炎孔板１２は、保炎板９に取り付け
られた状態で、副炎孔１３、１３を穿った副炎孔形成面
１２Ａが保炎板９の立壁９Ａ上端に当接し、副炎孔形成
面１２Ａの高さ位置が規制される。そして、この副炎孔
形成面１２Ａの高さ位置は前記バーナ体５の主炎孔形成
面７よりも約１〜３ｍｍ低く設定されている。The sub-flame hole plate 12 is attached to the flame-holding plate 9, and the sub-flame hole forming surface 12A having the sub-flame holes 13, 13 abuts on the upper end of the standing wall 9A of the flame-holding plate 9. The height position of the auxiliary flame hole forming surface 12A is regulated. The height position of the auxiliary flame hole forming surface 12A is set lower than the main flame hole forming surface 7 of the burner body 5 by about 1 to 3 mm.

【００１７】１４は前記仕切り壁３Ａの両側の二次空気
通路４Ａ、４Ａの上部に設けられた断面略コ字状の中間
副炎孔板であり、この中間副炎孔板１４は、径が約１ｍ
ｍの希薄混合ガス噴出用の多数の小孔１５、１５をその
長手方向の両サイドに沿うように２列に並べて穿った小
孔形成面１４Ａと、この小孔形成面１４Ａの両縁から下
向きに折り曲げられた左右の側片１４Ｂ、１４Ｃとを有
し、これら両側片１４Ｂ、１４Ｃを仕切り壁３Ａに隣接
するバーナ体５、５の保炎板９．９の立壁９Ａ、９Ａに
外嵌合することにより、仕切り壁３Ａを上から覆うよう
に仕切り壁３Ａを跨いで設けられている。そして、この
中間副炎孔板１４の小孔形成面１４Ａに穿った多数の小
孔１５、１５の総開口面積は、一つの副炎孔板１２の副
炎孔形成面１２Ａに穿った多数の副炎孔１３、１３の総
開口面積以下に設定されている。Reference numeral 14 denotes an intermediate sub-flame plate having a substantially U-shaped cross section, which is provided above the secondary air passages 4A, 4A on both sides of the partition wall 3A. About 1m
A small hole forming surface 14A formed by arranging a large number of m small holes 15 for jetting a lean mixed gas in two rows along both sides in the longitudinal direction, and downward from both edges of the small hole forming surface 14A. Has left and right side pieces 14B and 14C bent to the outside, and these both side pieces 14B and 14C are externally fitted to the standing walls 9A and 9A of the flame retaining plate 9.9 of the burner body 5 and 5 adjacent to the partition wall 3A. By doing so, the partition wall 3A is provided so as to cover the partition wall 3A from above. The total opening area of the small holes 15, 15 formed in the small hole forming surface 14A of the intermediate auxiliary flame hole plate 14 is equal to the total opening area of the small auxiliary hole forming surface 12A of one auxiliary flame hole plate 12. It is set to be equal to or less than the total opening area of the auxiliary flame holes 13, 13.

【００１８】１６、１６は前記バーナケース３の両側壁
３Ｂ、３Ｂとこれら両側壁３Ｂ、３Ｂに近接するバーナ
体５、５との間の二次空気通路４Ｂ、４Ｂの上部に設け
られた端部副炎孔板であり、これら端部副炎孔板１６、
１６は、径が約１ｍｍの希薄混合ガス噴出用の多数の孔
１７、１７をその長手方向の中央部に沿うように１列に
並べて穿っている。そして、この端部副炎孔板１６に穿
った多数の孔１７、１７の総開口面積は、一つの副炎孔
板１１の副炎孔形成面１１Ａに穿った多数の副炎孔１
３、１３の総開口面積の半分以下に設定されている。Reference numerals 16 and 16 denote ends of the secondary air passages 4B and 4B between the side walls 3B and 3B of the burner case 3 and the burner bodies 5 and 5 adjacent to the side walls 3B and 3B. Part auxiliary flame hole plate, and these end auxiliary flame hole plates 16,
The hole 16 has a large number of holes 17 having a diameter of about 1 mm for jetting a rare mixed gas, which are arranged in a line along the central portion in the longitudinal direction. The total opening area of the large number of holes 17, 17 formed in the end sub-flame hole plate 16 is such that the number of sub-flame holes 1 formed in the sub-flame hole forming surface 11A of one sub-flame plate 11 is large.
It is set to be less than half of the total opening area of 3 and 13.

【００１９】次に、図２中に示す燃料ガス供給装置２０
について説明する。この燃料ガス供給装置２０は、燃料
ガス供給経路に、元電磁弁２１及び比例弁２２を介装す
るとともに、比例弁２２の下流側で第１経路２３と第２
経路２４の２経路に分岐し、これら第１及び第２経路２
３、２４にはそれぞれ電磁弁２５、２６を介装してい
る。Next, the fuel gas supply device 20 shown in FIG.
Will be described. In the fuel gas supply device 20, the original electromagnetic valve 21 and the proportional valve 22 are provided in the fuel gas supply path, and the first path 23 and the second path 23 are provided downstream of the proportional valve 22.
It is branched into two routes of route 24, and these first and second routes 2
Solenoid valves 25 and 26 are provided on 3 and 24, respectively.

【００２０】前記第１経路２３は、電磁弁２５の下流側
で第３経路２７を分岐し、この第３経路２７を前記バー
ナケース３の左の部屋Ｘの二次空気通路４、４Ａ、４Ｂ
にガス燃料を供給する第１補助ノズル２８に連結すると
ともに、第３経路２１の分岐部の下流側は、バーナケー
ス３の左の部屋Ｘの各バーナ体５、５にガス燃料を供給
する複数の第１主ノズル２９、２９に連結している。The first path 23 branches off from the third path 27 on the downstream side of the solenoid valve 25, and the third path 27 is connected to the secondary air passages 4, 4A, 4B in the room X on the left side of the burner case 3.
Is connected to the first auxiliary nozzle 28 for supplying the gas fuel to the first auxiliary nozzle 28. Of the first main nozzles 29, 29.

【００２１】前記第２経路２４は、電磁弁２６の下流側
で第４経路３０を分岐し、この第４経路３０を前記バー
ナケース３の右の部屋Ｙの二次空気通路４、４Ａ、４Ｂ
にガス燃料を供給する第２補助ノズル３１に連結すると
ともに、第４経路３０の分岐部の下流側は、バーナケー
ス３の右の部屋Ｙの各バーナ体５、５にガス燃料を供給
する複数の第２主ノズル３２、３２に連結している。３
３は放電点火プラグ等の点火器、３４は炎の有無を検出
する炎検出器、３５は制御部であり、この制御部３５は
元電磁弁２１、比例弁２２、電磁弁２５、２６の開閉を
制御するとともに、点火器３３の点火動作や、送風機１
の回転数可変制御を行って燃焼を制御する。３８、３８
はバーナケース３の上部の外周部全周に設けられた多数
の空気噴出孔である。The second passage 24 branches off the fourth passage 30 on the downstream side of the solenoid valve 26, and the fourth passage 30 is connected to the secondary air passages 4, 4A, 4B in the room Y on the right side of the burner case 3.
Is connected to the second auxiliary nozzle 31 for supplying the gas fuel to the second auxiliary nozzle 31, and the downstream side of the branch portion of the fourth passage 30 supplies the gas fuel to the burner bodies 5 and 5 in the right room Y of the burner case 3. Of the second main nozzles 32, 32. Three
3 is an igniter such as a discharge spark plug, 34 is a flame detector for detecting the presence or absence of flame, and 35 is a control unit. This control unit 35 opens and closes the original solenoid valve 21, the proportional valve 22, and the solenoid valves 25, 26. The blower 1 and the ignition operation of the igniter 33.
Combustion is controlled by performing variable speed control of the. 38, 38
Are a large number of air ejection holes provided on the entire outer peripheral portion of the upper portion of the burner case 3.

【００２２】３９、３９は、前記バーナ体５の混合ガス
噴出孔１１よりも上流側となる二次空気通路４、４の中
間位置にそれぞれ介装した通気抵抗板であり、これら通
気抵抗板３９は、図３及び図５に示すように、下端部が
つながれ、かつ、約２〜３ｍｍの間隔を存して対向した
略垂直な対向壁３９Ａ、３９Ａと、これら各対向壁３９
Ａ、３９Ａの上端から外向きに張り出した断面略Ｌ字状
の支持板部３９Ｂ、３９Ｂとを、一枚板のステンレスに
て折曲形成してなり、前記支持板部３９Ｂ、３の一部を
バーナ体５、５に当接させてバーナ体５、５間に安定的
に保持させている。また、前記各対向壁３９Ａ、３９Ａ
の中間位置には、多数の縦スリット４０、４０が所定の
間隔を存して横並びにそれぞれ穿ってあり、一つの通気
抵抗板３９の縦スリット４０、４０の総開口面積は、一
つの副炎孔板１２の副炎孔１３、１３の総開口面積以下
に設定されている。また、前記縦スリット４０は、縦寸
法が約８ｍｍ、横寸法が約０．８ｍｍに設定されてい
る。Reference numerals 39 and 39 denote ventilation resistance plates provided at intermediate positions of the secondary air passages 4 and 4 on the upstream side of the mixed gas ejection holes 11 of the burner body 5, respectively. As shown in FIGS. 3 and 5, the lower end portions are connected to each other, and substantially vertical facing walls 39A and 39A facing each other with an interval of about 2 to 3 mm, and these facing walls 39.
A and 39A support plates 39B and 39B having a substantially L-shaped cross section that protrudes outward from the upper ends are bent and formed by a single plate of stainless steel, and a part of the support plates 39B and 3B is formed. Is brought into contact with the burner bodies 5 and 5 so as to be stably held between the burner bodies 5 and 5. In addition, each of the facing walls 39A, 39A
In the middle position of the vertical slits 40, 40, a plurality of vertical slits 40, 40 are formed side by side with a predetermined interval, and the total opening area of the vertical slits 40, 40 of one ventilation resistance plate 39 is one auxiliary flame. It is set to be equal to or smaller than the total opening area of the auxiliary flame holes 13 of the hole plate 12. The vertical slit 40 has a vertical dimension of about 8 mm and a horizontal dimension of about 0.8 mm.

【００２３】図３中の４１、４１は、前記副炎孔板１２
の副炎孔形成面１２Ａと通気抵抗板３９の支持板部３９
Ｂ、３９Ｂとの間の位置させて各二次空気通路４、４に
配設した整流部材であり、これら整流部材４１、４１は
２枚のステンレスの波状板を重ねたハニカム形成体で作
られており、その上半部は前記保炎板９．９の立壁９
Ａ、９Ａ間に介挿保持され、下端は前記通気抵抗板３９
に近接している。Reference numerals 41 and 41 in FIG. 3 denote the auxiliary flame hole plate 12
12A of the auxiliary flame hole forming surface and the support plate portion 39 of the ventilation resistance plate 39
B and 39B are rectifying members disposed in the respective secondary air passages 4 and 4 so as to be positioned between B and 39B. These rectifying members 41 and 41 are made of a honeycomb formed body in which two stainless corrugated plates are stacked. The upper half of the upper wall is the standing wall 9 of the flame holding plate 9.9.
It is inserted and held between A and 9A, and the lower end is the ventilation resistance plate 39.
Is close to.

【００２４】上述の構成において、前記各バーナ体５の
混合室６に空気比が約１〜１．３のやや希薄な混合ガス
が供給され、また、各バーナ体５、５間の二次空気通路
４、４Ａ、４Ｂの下方部分には空気比が約１．８〜２．
５の超希薄混合ガスが供給されると、各バーナ体５の混
合室６に供給された混合ガスは、その一部が混合ガス噴
出孔１１を通って二次空気通路４に噴出されるととも
に、袖火用孔１０、１０を通って保炎空間イに流出し、
残りの大部分は主炎孔８、８に向かって流れて主炎孔
８、８から噴出する。一方、二次空気通路４、４の下方
部分に供給された空気比が約１．８〜２．５の超希薄混
合ガスは、各通気抵抗板３９、３９の縦スリット４０、
４０を通過した後、整流部材４１、４１の通路を上昇
し、そして、混合ガス噴出孔１１から噴出した空気比が
約１〜１．３の混合ガスと混合して、空気比が約１．５
〜２．２の希薄混合ガスとなり、副炎孔板１２の副炎孔
１３、１３から噴出する。また、二次空気通路４Ａ、４
Ａ、４Ｂ、４Ｂの下方部分に供給された空気比が約１．
８〜２．５の超希薄混合ガスは、これら二次空気通路４
Ａ、４Ｂを上昇し、混合ガス噴出孔１１から噴出した空
気比が約１〜１．３の混合ガスと混合して空気比が約
１．５〜２．２の希薄混合ガスとなり、中間副炎孔板１
４の小孔１５、１５、各端部副炎孔板１６、１６の孔１
７、１７から噴出する。In the above structure, a slightly diluted mixed gas having an air ratio of about 1 to 1.3 is supplied to the mixing chamber 6 of each burner body 5, and the secondary air between the burner bodies 5 and 5 is supplied. In the lower part of the passages 4, 4A, 4B, the air ratio is about 1.8-2.
When the super-dilute mixed gas No. 5 is supplied, a part of the mixed gas supplied to the mixing chamber 6 of each burner body 5 is ejected to the secondary air passage 4 through the mixed gas ejection hole 11. , Through the sleeve fire holes 10, 10 to the flame holding space a,
Most of the rest flows toward the main flame holes 8 and 8 and is ejected from the main flame holes 8 and 8. On the other hand, the ultra-lean mixed gas having an air ratio of about 1.8 to 2.5 supplied to the lower portions of the secondary air passages 4 and 4 has a vertical slit 40 of each ventilation resistance plate 39, 39.
After passing through 40, the flow path of the flow regulating members 41, 41 rises, and is mixed with the mixed gas having an air ratio of about 1 to 1.3 ejected from the mixed gas ejection hole 11 to have an air ratio of about 1. 5
It becomes a lean mixed gas of up to 2.2 and is ejected from the sub flame holes 13 of the sub flame hole plate 12. In addition, the secondary air passages 4A, 4
The air ratio supplied to the lower part of A, 4B, 4B is about 1.
The ultra-lean mixed gas of 8 to 2.5 is used in these secondary air passages 4
A and 4B are raised and mixed with the mixed gas having an air ratio of about 1 to 1.3 ejected from the mixed gas ejection holes 11 to form a lean mixed gas having an air ratio of about 1.5 to 2.2. Flame plate 1
4, small holes 15, 15 and holes 1 in each end auxiliary flame hole plate 16, 16
Eject from 7 and 17.

【００２５】上述の状態で、点火器３３にスパークを発
生させると、主炎孔８、８から噴出する混合ガスが着火
し、この着火炎が隣の副炎孔１３、１３から噴出する希
薄混合ガスに火移りして、全体の燃焼が開始される。全
体の燃焼開始により、各バーナ体５の主炎孔８上には高
さの低い炎（一次炎）が形成され、各保炎空間イ上には
袖火炎が形成され、各バーナ体５、５の上方と副炎孔板
１２、１２、中間副炎孔板１４、端部副炎孔板１６の上
方には、互いに連なって保炎性の高い安定した大きな炎
（二次炎）が形成され、ＮＯｘ発生量の少ない希薄混合
ガス多段燃焼が行われる。When a spark is generated in the igniter 33 in the above-mentioned state, the mixed gas ejected from the main flame holes 8 and 8 is ignited, and this ignition flame is diluted from the adjacent auxiliary flame holes 13 and 13. The fire is transferred to the gas and the whole combustion is started. When the whole combustion starts, a low-level flame (primary flame) is formed on the main flame holes 8 of each burner body 5, and a sleeve flame is formed on each flame holding space a. 5 and above the sub-flame plates 12, 12, the intermediate sub-flame plate 14 and the end sub-flame plate 16, a stable large flame (secondary flame) with high flame holding property is formed. Thus, the lean mixed gas multi-stage combustion that produces a small amount of NOx is performed.

【００２６】ここで、強燃焼時には、制御部３５によ
り、電磁弁２５、２６の双方が開放されて、第１主ノズ
ル２９、２９及び第２主ノズル３２、３２から全数のバ
ーナ体５、５にガス燃料が供給されるとともに、第１補
助ノズル２８及び第２補助ノズル３１からバーナケース
３の左右の部屋Ｘ、Ｙにガス燃料が供給される。また、
燃焼状態が強燃焼から燃焼量を絞った弱燃焼に切り換わ
った場合は、制御部３５により、電磁弁２５は開放され
たままであるが、電磁弁２６が閉められ、この電磁弁２
６の閉塞により、第２主ノズル３２、３２からのガス燃
料の供給が停止されるとともに、第２補助ノズル３１か
らのガス燃料の供給も停止される。そのため、バーナケ
ース３の右の部屋Ｙに設置されたバーナ体５、５及び、
この右の部屋Ｙの二次空気通路４、４Ａ、４Ｂには、ガ
ス燃料が供給されず、ＮＯｘ発生量の少ない希薄混合ガ
ス多段燃焼を行いつつ、燃焼させるバーナ本数の切り換
えにより、ガス漏れを心配することなく、燃焼幅を拡大
することができる。At the time of strong combustion, the control unit 35 opens both of the solenoid valves 25 and 26, so that all the burner bodies 5 and 5 are discharged from the first main nozzles 29 and 29 and the second main nozzles 32 and 32. In addition to being supplied with the gas fuel, the first auxiliary nozzle 28 and the second auxiliary nozzle 31 supply the gas fuel to the left and right chambers X and Y of the burner case 3. Also,
When the combustion state is switched from the strong combustion to the weak combustion in which the combustion amount is reduced, the control unit 35 closes the solenoid valve 26 while keeping the solenoid valve 25 open.
Due to the blockage of 6, the supply of gas fuel from the second main nozzles 32, 32 is stopped, and the supply of gas fuel from the second auxiliary nozzle 31 is also stopped. Therefore, the burner bodies 5 and 5 installed in the room Y on the right of the burner case 3 and
Gas fuel is not supplied to the secondary air passages 4, 4A, 4B in the room Y on the right side, and gas leakage is caused by switching the number of burners to be burned while performing the multi-stage combustion of a lean mixed gas with a small NOx generation amount. The combustion width can be expanded without worry.

【００２７】本実施形態例によれば、頂部の主炎孔形成
面７に多数の主炎孔８、８を有する主体５Ａの左右両側
壁の上部に複数の袖火用孔１０、１０を設けるととも
に、この袖火用孔１０、１０に対向する立壁９Ａを有す
る一対の保炎板９、９を設けたバーナ体５を備え、この
バーナ体５、５を相互に二次空気通路４、４Ａ、４Ｂ
（通気間隔）を存してバーナケース３内に６本並設し、
前記二次空気通路４、４Ａ、４Ｂの内部下方部分には、
バーナ体５の混合室６に供給する約１〜１．３のやや希
薄な混合ガスよりも更に希薄な空気比が約１．８〜２．
５の超希薄混合ガスを供給するようにしたガス燃焼装置
であり、各バーナ体５、５には、保炎板９の根本部９Ｂ
よりも上流側となる主体５Ａの両側壁に、二次空気通路
４、４Ａ、４Ｂに向けて空気比が約１〜１．３のやや希
薄な混合ガスを噴出する混合ガス噴出孔１１、１１を横
並びに複数穿った構成としているので、各二次空気通路
４、４Ａ、４Ｂからは、混合ガス噴出孔１１から噴出す
るやや希薄な混合ガス（空気比が１．０〜１．３）と、
各二次空気通路４、４Ａ、４Ｂの下方部から送られてく
る超希薄混合ガス（空気比が１．８〜２．５）とが混合
した希薄混合ガス（空気比が１．５〜２．２）を流出さ
せて、希薄混合ガス多段燃焼を行わせることができる。
そのため、混合ガス噴出孔１１よりも下方部（上流側）
の二次空気通路４、４Ａ、４Ｂを流れる希薄混合ガス
は、ガス濃度が従来よりも更に希薄化されて引火しにく
い超希薄混合ガス（空気比が１．８〜２．５）でよく、
各二次空気通路４、４Ａ、４Ｂを流れる混合気体のガス
量が突発的に変動したり、点火器３３のスパークを発生
させる着火時に、着火遅れが生じた場合でも、各二次空
気通路４、４Ａ、４Ｂ内への逆火を抑制できる。According to this embodiment, a plurality of sleeve fire holes 10 and 10 are provided on the left and right side walls of the main body 5A having a large number of main flame holes 8 on the top main flame hole forming surface 7. A burner body 5 provided with a pair of flame holding plates 9 and 9 having standing walls 9A facing the sleeve fire holes 10 and 10 is provided, and the burner bodies 5 and 5 are mutually connected to the secondary air passages 4 and 4A. 4B
There are 6 vents, and 6 are installed side by side in the burner case 3.
In the lower inner part of the secondary air passages 4, 4A, 4B,
The leaner air ratio than the slightly lean mixed gas of about 1 to 1.3 supplied to the mixing chamber 6 of the burner body 5 is about 1.8 to 2.
5 is a gas combustion device adapted to supply an ultra-lean mixed gas of 5, and each burner body 5, 5 has a root portion 9B of a flame holding plate 9.
On the both side walls of the main body 5A on the upstream side of the mixed gas ejection holes 11, 11 for ejecting a slightly diluted mixed gas having an air ratio of about 1 to 1.3 toward the secondary air passages 4, 4A, 4B. Since a plurality of holes are arranged side by side, a slightly diluted mixed gas (air ratio is 1.0 to 1.3) ejected from the mixed gas ejection holes 11 from the respective secondary air passages 4, 4A, 4B. ,
A lean mixed gas (air ratio of 1.5 to 2) mixed with an ultra-lean mixed gas (air ratio of 1.8 to 2.5) sent from the lower portion of each secondary air passage 4, 4A, 4B. .2) can be discharged to perform lean mixed gas multi-stage combustion.
Therefore, the lower part (upstream side) of the mixed gas ejection hole 11
The lean mixed gas flowing through the secondary air passages 4, 4A, and 4B may be an ultra-lean mixed gas (air ratio is 1.8 to 2.5) whose gas concentration is more diluted than that of the conventional one and which is difficult to ignite.
Even if the gas amount of the mixed gas flowing through each of the secondary air passages 4, 4A, and 4B fluctuates suddenly or ignition is delayed at the time of ignition causing sparks of the igniter 33, each secondary air passage 4 It is possible to suppress flashback into 4A and 4B.

【００２８】また、バーナ体５、５の隣接する保炎板
９、９の立壁９Ａ、９Ａ間に、複数の副炎孔１３を副炎
孔形成面１２Ａに有する副炎孔板１２を架設したことに
より、副炎孔板１２に穿った複数の副炎孔１３によっ
て、希薄混合ガス噴出用の炎孔面積を従来よりも小さく
して噴出速度を高めることが可能となり、二次空気通路
４内への逆火が一層抑制されるばかりでなく、バーナ体
５の混合ガス噴出孔１１よりも上流側となる各二次空気
通路４、４の中間位置にはそれぞれ通気抵抗板３９、３
９を介装しているので、この通気抵抗板３９、３９によ
って、副炎孔板１２近くの二次空気通路４の内圧を低下
させることができ、バーナ体５に穿った混合ガス噴出孔
１１、１１からの混合ガスの流出が促進され、副炎孔板
１２の副炎孔１３から流出する希薄混合ガスの空気比を
約１．５〜２．２の所望の値に維持できる。Further, an auxiliary flame hole plate 12 having a plurality of auxiliary flame holes 13 on the auxiliary flame hole forming surface 12A is provided between the standing walls 9A, 9A of the adjacent flame holding plates 9, 9 of the burner bodies 5, 5. As a result, by the plurality of sub-flame holes 13 formed in the sub-flame plate 12, the area of the flame hole for jetting the lean mixed gas can be made smaller than in the conventional case, and the jetting speed can be increased. In addition to further suppressing the flashback to the air flow resistance plates 39, 3 at the intermediate positions of the secondary air passages 4, 4 on the upstream side of the mixed gas ejection holes 11 of the burner body 5, respectively.
Since the ventilation resistance plates 39, 39 can reduce the internal pressure of the secondary air passage 4 near the auxiliary flame hole plate 12, the mixed gas injection hole 11 formed in the burner body 5 , 11 is promoted, and the air ratio of the lean mixed gas flowing out from the auxiliary flame hole 13 of the auxiliary flame hole plate 12 can be maintained at a desired value of about 1.5 to 2.2.

【００２９】また、前記通気抵抗板３９の縦スリット４
０、４０の総開口面積を、副炎孔板１２の副炎孔１３、
１３の総開口面積以下に設定したことにより、縦スリッ
ト４０から流出する通気抵抗板３９近くの希薄混合ガス
の流速を増加させることができ、通気抵抗板３９よりも
下の二次空気通路４内下方部への逆火をより確実に防止
し得る。Further, the vertical slit 4 of the ventilation resistance plate 39.
The total opening area of 0 and 40 is set to the auxiliary flame hole 13 of the auxiliary flame hole plate 12,
By setting it to be equal to or less than the total opening area of 13, it is possible to increase the flow rate of the lean mixed gas near the ventilation resistance plate 39 flowing out from the vertical slit 40, and in the secondary air passage 4 below the ventilation resistance plate 39. The flashback to the lower part can be prevented more reliably.

【００３０】[0030]

【発明の効果】請求項１の低ＮＯｘガス燃焼装置におい
ては、バーナ体には、保炎板の根本部よりも上流側とな
る主体の両側壁に、バーナ体間の通気間隔に向けて混合
ガスを噴出する混合ガス噴出孔を設けた構成としたこと
により、混合ガス噴出孔よりも上流の通気間隔内を流れ
る希薄混合ガスのガス濃度を、従来よりもさらに希薄化
して引火しにくいようにでき、そのため、バーナ体間の
通気間隔を流れる混合気体のガス量が突発的に変動した
り、着火時に着火遅れが生じた場合でも、各通気間隔内
への逆火を抑制でき、安全で、かつ、安定した低ＮＯｘ
燃焼を実現できる。In the low NOx gas combustion apparatus according to the first aspect of the present invention, the burner body is mixed on both side walls of the main body upstream of the root portion of the flame holding plate toward the ventilation interval between the burner bodies. By providing a mixed gas ejection hole for ejecting gas, the gas concentration of the lean mixed gas flowing in the ventilation interval upstream of the mixed gas ejection hole is made more dilute than in the past to make it difficult to ignite. Therefore, even if the gas amount of the mixed gas flowing through the ventilation interval between the burner bodies suddenly changes or even if an ignition delay occurs at the time of ignition, it is possible to suppress the flashback within each ventilation interval and it is safe, And stable low NOx
Combustion can be realized.

【００３１】また、バーナ体の隣接する保炎板間に多数
の副炎孔を副炎孔形成面に有する副炎孔板を架設したこ
とにより、副炎孔板に穿った複数の副炎孔によって、希
薄混合ガス噴出用の炎孔面積を狭ばめるなど、適宜調整
可能となり、通気間隔内への逆火が一層抑制されるとと
もに、混合ガス噴出孔よりも上流側の通気間隔内には通
気抵抗板を設けた構成としているので、この通気抵抗板
によって、副炎孔板近くの通気間隔の内圧を低下させる
ことができ、バーナ体に設けた混合ガス噴出孔からの混
合ガスの流出を促進できる。さらに、副炎孔板の副炎孔
形成面と通気抵抗板との間にはハニカム形成体にて成る
整流部材が設けられており、通気抵抗板通過後の希薄混
合ガスの整流効果が得られる。 Further, more that bridged sub fire hole plate having a plurality of sub burner ports to Fukuhonoo hole forming surface adjacent flame holding plates of the burner body, a plurality of sub-flame bored in the sub-burner port plate With the holes, the area of the flame holes for jetting the lean mixed gas can be adjusted as appropriate, and the flashback into the ventilation interval can be further suppressed, and within the ventilation interval on the upstream side of the mixed gas injection hole. Since a ventilation resistance plate is provided in the air flow resistance plate, this ventilation resistance plate can reduce the internal pressure of the ventilation interval near the auxiliary flame hole plate, and the mixed gas from the mixed gas ejection holes provided in the burner body can be discharged. Can accelerate the outflow. In addition, the secondary flame holes on the secondary flame plate
A honeycomb formed body is formed between the forming surface and the ventilation resistance plate.
A rectifying member is provided to dilute the mixture after passing through the ventilation resistance plate.
A rectifying effect of the mixed gas can be obtained.

【００３２】請求項２の低ＮＯｘガス燃焼装置において
は、上述の効果の他に、通気抵抗板のスリットの総開口
面積を前記副炎孔板の副炎孔の総開口面積以下に設定し
たことにより、スリットから流出する通気抵抗板近くの
希薄混合ガスの流速を増加させることができ、通気間隔
下方部への逆火をより確実に防止し得る。In the low NOx gas combustion apparatus of the second aspect, in addition to the above effects, the total opening area of the slits of the ventilation resistance plate is set to be equal to or less than the total opening area of the sub flame holes of the sub flame hole plate. Thereby, the flow velocity of the lean mixed gas near the ventilation resistance plate flowing out from the slit can be increased, and the flashback to the lower part of the ventilation interval can be more reliably prevented.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の一実施形態例を示す低ＮＯｘガス燃焼
装置の平面図である。FIG. 1 is a plan view of a low NOx gas combustion device showing an embodiment of the present invention.

【図２】同じく全体構成を説明する説明図である。FIG. 2 is an explanatory diagram similarly illustrating the overall configuration.

【図３】同じく図１のＡ−Ａ断面による縦断面図であ
る。3 is a vertical sectional view taken along the line AA of FIG.

【図４】同じくバーナ体単体の側面図である。FIG. 4 is a side view of the burner body alone.

【図５】同じく通気抵抗板の側面図と正面図である。FIG. 5 is a side view and a front view of the ventilation resistance plate.

【符号の説明】[Explanation of symbols]

３ バーナケース ４ 二次空気通路（通気間隔） ５ バーナ体 ５Ａ バーナ体の主体 ８ 主炎孔 ９ 保炎板 ９Ａ 保炎板の立壁 ９Ｂ 保炎板の根本部 １１ 混合ガス噴出孔 １２ 副炎孔板 １３ 副炎孔 ３９ 通気抵抗板 ４０ 縦スリツト（スリット） 3 burner case 4 Secondary air passage (ventilation interval) 5 burner body 5A Burner body 8 main flame holes 9 Flame plate 9A Flameproof plate standing wall 9B Flame retardant plate base 11 Mixed gas ejection holes 12 Sub-flame plate 13 Secondary flame hole 39 Ventilation resistance plate 40 Vertical slit (slit)

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−297711（ＪＰ，Ａ) 特開 平６−147432（ＪＰ，Ａ) 特開 平５−296421（ＪＰ，Ａ) 特開 平４−121510（ＪＰ，Ａ) 特開 平６−331110（ＪＰ，Ａ) 特開 平８−327028（ＪＰ，Ａ) (58)調査した分野(Int.Cl.⁷，ＤＢ名) F23D 14/02 - 14/10 F23C 11/00 329 - 330 ─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP-A-4-297711 (JP, A) JP-A-6-147432 (JP, A) JP-A-5-296421 (JP, A) JP-A-4- 121510 (JP, A) JP-A-6-331110 (JP, A) JP-A-8-327028 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F23D 14/02-14 / 10 F23C 11/00 329-330

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 頂部に主炎孔を有する主体の両側壁上部
に袖火用孔を設けるとともに、この袖火用孔と対向する
立壁を有する一対の保炎板を設けたバーナ体を備え、こ
のバーナ体を相互に通気間隔を存してバーナケース内に
複数並設し、これらバーナ体間の通気間隔には、前記バ
ーナ体に供給する混合ガスよりも希薄な希薄混合ガスが
供給されるガス燃焼装置において、前記バーナ体には、
前記保炎板の根本部よりも上流側となる主体の両側壁
に、前記バーナ体間の通気間隔に向けて混合ガスを噴出
する混合ガス噴出孔を設け、前記バーナ体の隣接する保
炎板間には、多数の副炎孔を副炎孔形成面に有する副炎
孔板を架設し、さらに、前記混合ガス噴出孔よりも上流
側の通気間隔内には通気抵抗板を設けるとともに、前記
副炎孔板の副炎孔形成面と通気抵抗板との間にはハニカ
ム形成体にて成る整流部材を設けたことを特徴とする低
ＮＯｘガス燃焼装置。1. A burner body having a main body having a main flame hole at the top thereof and having sleeve fire holes at the upper portions of both side walls, and a pair of flame holding plates having standing walls facing the sleeve fire holes, A plurality of the burner bodies are arranged side by side in the burner case with a ventilation interval therebetween, and a lean mixed gas that is leaner than the mixed gas supplied to the burner bodies is supplied to the ventilation intervals between the burner bodies. In the gas combustion device, the burner body includes
On both side walls of the main body on the upstream side of the root portion of the flame holding plate, there are provided mixed gas ejection holes for ejecting a mixed gas toward the ventilation interval between the burner bodies, so that the adjacent burner bodies are protected.
A secondary flame that has a large number of secondary flame holes on the secondary flame hole formation surface between the flame plates.
A perforated plate is installed, and further upstream of the mixed gas ejection hole
A ventilation resistance plate is provided in the ventilation interval on the side,
A honeycomb is provided between the surface of the secondary flame hole plate where the secondary flame hole is formed and the ventilation resistance plate.
A low NOx gas combustion device, which is provided with a rectifying member made of a metal forming body . 【請求項２】 頂部に主炎孔を有する主体の両側壁上部
に袖火用孔を設けるとともに、この袖火用孔と対向する
立壁を有する一対の保炎板を設けたバーナ体を備え、こ
のバーナ体を相互に通気間隔を存してバーナケース内に
複数並設し、これらバーナ体間の通気間隔には、前記バ
ーナ体に供給する混合ガスよりも希薄な希薄混合ガスが
供給されるガス燃焼装置において、前記バーナ体には、
前記保炎板の根本部よりも上流側となる主体の両側壁
に、前記バーナ体間の通気間隔に向けて混合ガスを噴出
する混合ガス噴出孔を設け、前記バーナ体の隣接する保
炎板間には、多数の副炎孔を副炎孔形成面に有する副炎
孔板を架設し、さらに、前記混合ガス噴出孔よりも上流
側の通気間隔内には複数のスリットを穿った通気抵抗板
を設けるとともに、この通気抵抗板のスリットの総開口
面積を前記副炎孔板の副炎孔の総開口面積以下に設定
し、かつ、前記副炎孔板の副炎孔形成面と通気抵抗板と
の間にはハニカム形成体にて成る整流部材を設けたこと
を特徴とする低ＮＯｘガス燃焼装置。2. A burner body having a main body having a main flame hole at the top thereof and sleeve fire holes provided at upper portions of both side walls, and a pair of flame holding plates having standing walls facing the sleeve fire holes, A plurality of the burner bodies are arranged side by side in the burner case with a ventilation interval therebetween, and a lean mixed gas that is leaner than the mixed gas supplied to the burner bodies is supplied to the ventilation intervals between the burner bodies. In the gas combustion device, the burner body includes
On both side walls of the main body upstream of the root portion of the flame holding plate, mixed gas ejection holes for ejecting a mixed gas toward the ventilation interval between the burner bodies are provided, and the flame holding plate adjacent to the burner body is provided. In between, a sub-flame plate having a large number of sub-flame holes on the sub-flame hole forming surface is erected, and further, a ventilation resistance having a plurality of slits in the ventilation interval upstream of the mixed gas ejection hole. Rutotomoni provided a plate, the total opening of the slit of the airflow resistance plate
Set the area below the total opening area of the sub-flame holes in the sub-flame plate
And the auxiliary flame hole forming surface of the auxiliary flame hole plate and the ventilation resistance plate
A low NOx gas combustion apparatus, characterized in that a rectifying member made of a honeycomb formed body is provided between them.