JPS6287707A - Nox control combustion method - Google Patents
Nox control combustion methodInfo
- Publication number
- JPS6287707A JPS6287707A JP22965285A JP22965285A JPS6287707A JP S6287707 A JPS6287707 A JP S6287707A JP 22965285 A JP22965285 A JP 22965285A JP 22965285 A JP22965285 A JP 22965285A JP S6287707 A JPS6287707 A JP S6287707A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- combustion
- nox
- fuel
- complete combustion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【発明の詳細な説明】 産業上の利用分野 本発明はＮＯｘ抑制燃焼法に関する。[Detailed description of the invention] Industrial applications The present invention relates to a NOx suppression combustion method.
従来の技術
従来、ＮＯｘ抑制燃焼法として三段燃焼法が既に提案さ
れている。この三段燃焼法は、第５図（竪型炉の場合）
及び第６図（横型炉の場合）に示すように、１次燃料２
１を１次空気２２により燃焼させた後の燃焼排ガス中に
２次燃料２３だけを供給して１次燃焼排ガス中に残存フ
−る低Ｈ度の酸素で不完全燃焼させてＮＯｘを還元し、
そしてその後の排ガス中に２１次空気２４だけを供給し
て未燃分を完全燃焼させる方法である。BACKGROUND OF THE INVENTION Conventionally, a three-stage combustion method has been proposed as a NOx suppression combustion method. This three-stage combustion method is shown in Figure 5 (in the case of a vertical furnace).
And as shown in Figure 6 (for horizontal furnace), the primary fuel 2
1 is combusted by the primary air 22, only the secondary fuel 23 is supplied to the combustion exhaust gas, and NOx is reduced by incomplete combustion with the low H degree oxygen remaining in the primary combustion exhaust gas. ,
Then, only the 21st air 24 is supplied into the subsequent exhaust gas to completely burn the unburned components.
発明が解決しようとする問題点
上記三段燃焼法をボイラなどのように、受熱面が比較的
低温でその面積が大きく吸収熱量の多い火炉に適用した
場合、ＮＯｘの光生吊は極めて低く抑えることができる
が、炉内での熱吸収量が多いために排ガスの温度低下が
茗るしく最終段での燃焼が完結せず、従って排ガス中に
未燃分が多く含まれやりいという問題があった。Problems to be Solved by the Invention When the above-mentioned three-stage combustion method is applied to a furnace, such as a boiler, where the heat receiving surface is relatively low temperature, has a large area, and absorbs a large amount of heat, it is possible to keep the NOx emission to an extremely low level. However, due to the large amount of heat absorbed in the furnace, the temperature of the exhaust gas drops slowly and combustion is not completed in the final stage, resulting in the problem that the exhaust gas tends to contain a large amount of unburned matter. Ta.
そこで本発明は上記問題を解消し得るＮＯｘ抑ｆｆ、ｌ
燃焼法を提供することを目的とする。Therefore, the present invention aims at reducing NOx, l, which can solve the above problem.
The purpose is to provide a combustion method.
問題貞を解決するだめの１段
上記問題を解決するため、本発明のＮＯｘ抑制燃焼法は
、１次燃料の燃焼俊の燃焼排ガス中に２次燃料を供給し
て上記排ガス中に残存づる酸素で不完全燃焼させてＮＯ
ｘを還元し、その後流に２次空気を供給して未燃分を燃
焼させるＮＯｘ抑制燃焼法において、ＮＯｘを還元した
後で且つ２次空気の供給前に補助バーナを設けて排ガス
の温度低下を防Ｉ）：′Ｔｊる方法である。Step 1 to Solve the Problem In order to solve the above problem, the NOx suppression combustion method of the present invention supplies secondary fuel into the combustion exhaust gas of the primary fuel to reduce the oxygen remaining in the exhaust gas. to cause incomplete combustion and NO
In the NOx suppression combustion method, which reduces x and supplies secondary air to its downstream side to burn unburned matter, an auxiliary burner is installed after reducing NOx and before supplying the secondary air to lower the temperature of the exhaust gas. This is a method to prevent I):'Tj.
作用
−Ｆｌ′ｉ［！ＮＯｘ抑制燃焼法によると、ＮＯｘを還
元した後の、しかも完全燃焼域前の燃焼排ガスを補助バ
ーナにより加熱づるので、完全燃焼域において未燃分を
燃焼させることができる。Action-Fl′i[! According to the NOx suppression combustion method, the combustion exhaust gas after reducing NOx but before the complete combustion range is heated by an auxiliary burner, so that unburned gas can be combusted in the complete combustion range.
実施例
以下、本発明の一実施例を図面に基づき説明する。第１
図において、１は竪型炉で、その側壁１ａに下部から上
部に向って順に、１次空気２により１次燃料３を燃焼さ
せる主バーブ４．２次−燃料５供給用の２次燃料供給ノ
ズル６、補助空気７により補助燃料８を燃焼ざぜる補助
バーナ９、及び２次空気１０供給用の２次空気供給ノス
ル１１が設けられでいる。EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. 1st
In the figure, 1 is a vertical furnace, and on its side wall 1a, from the bottom to the top, there are main barbs 4, which burn the primary fuel 3 with the primary air 2, and a secondary fuel supply for supplying the secondary fuel 5. A nozzle 6 , an auxiliary burner 9 for burning auxiliary fuel 8 with auxiliary air 7 , and a secondary air supply nozzle 11 for supplying secondary air 10 are provided.
上記竪型炉１おいて、１次空気２により１次燃料３を燃
焼させた後の燃焼排ガス中に、２次燃料５を供給し、こ
の排ガス中に残存する低濃度の酸素で不完全燃焼させて
ＮＯｘを還元する。そして、この後の排ガスを、補助空
気７及び補助燃料８が供給される補助バーナ９により加
熱する。史にこの加熱された排ガス中に２次空気１０を
供給して完全燃焼を行なう。In the vertical furnace 1, the secondary fuel 5 is supplied into the combustion exhaust gas after the primary fuel 3 is combusted by the primary air 2, and the low concentration of oxygen remaining in the exhaust gas causes incomplete combustion. to reduce NOx. The subsequent exhaust gas is then heated by an auxiliary burner 9 to which auxiliary air 7 and auxiliary fuel 8 are supplied. Secondary air 10 is supplied into this heated exhaust gas to achieve complete combustion.
このように、ＮＯｘ還元後でしかも完全燃・焼される市
の排ガスを所定の温度まで加熱ブると共に、補助バーナ
の噴流による撹拌効果によって、最終段即ち完全燃焼域
での未燃分の燃焼速度が促進され、排ガス中の未燃分が
大幅に低減する。この際、燃料を石炭とした場合、補助
バーナの空気比が１．０以下にすると、高温の熱風によ
って還元ガス中のヂャーの熱分解が促進され、ＮＯｘの
低減効果がある。In this way, the city exhaust gas, which is completely combusted after NOx reduction, is heated to a predetermined temperature, and the agitation effect by the jet of the auxiliary burner allows the combustion of unburned gas in the final stage, that is, the complete combustion zone. The speed is increased and the amount of unburned matter in the exhaust gas is significantly reduced. At this time, when coal is used as the fuel, if the air ratio of the auxiliary burner is set to 1.0 or less, the thermal decomposition of the dia in the reducing gas is promoted by the high-temperature hot air, which has the effect of reducing NOx.
なお、第１図中、（Ａ＞は主燃焼域（１次燃焼域）、（
８）は還元燃焼域（２次燃焼域）、（Ｃ）は加熱域、（
Ｄ）は完全燃焼域（３次燃焼域）である。In Fig. 1, (A> is the main combustion area (primary combustion area), (
8) is the reducing combustion area (secondary combustion area), (C) is the heating area, (
D) is a complete combustion region (tertiary combustion region).
次に、実験結果を第２図及び第３図に示す。Next, the experimental results are shown in FIGS. 2 and 3.
これより補助バーナにおける補助燃料量が全体燃料倒の
５〜２０％その空気比が０．８５〜１．１の範囲が最も
イｊ効であった。更に、再加熱後の還元ガスの温度は１
１００℃〜１３５０°Ｃが好ましく、１１００℃より低
いと改善ａノ果が少なく、１３５０℃より高いと完全燃
焼地域て゛のＮＯｘの発生量が増加してしまう。From this, it was found that the most effective range was when the amount of auxiliary fuel in the auxiliary burner was 5 to 20% of the total fuel consumption and the air ratio was 0.85 to 1.1. Furthermore, the temperature of the reducing gas after reheating is 1
The temperature is preferably 100°C to 1350°C. If it is lower than 1100°C, there will be little improvement, and if it is higher than 1350°C, the amount of NOx generated in the complete combustion area will increase.
なお、第２図における燃焼条件を示すと燃料として瀝青
炭（灰分１１％、Ｎ分１．８％）が使用され、また全体
の空気比が１．２０とされ、更に１次燃゛焼域の空気比
が１．０５に、１次゛燃料比が７０％にきれている。第
３図の場合も、上記と同じ燃料が使用されると共に全体
の空気比が１．２０にされている。The combustion conditions in Figure 2 are as follows: bituminous coal (ash content 11%, nitrogen content 1.8%) is used as fuel, the overall air ratio is 1.20, and the primary combustion area is The air ratio is 1.05 and the primary fuel ratio is 70%. In the case of FIG. 3, the same fuel as above is used and the overall air ratio is 1.20.
ところで、ト記実施例においては、竪型炉１に適用した
場合を示したが、第４図に承りように、横型炉１２にも
適用し１ｑる。なお、第４図において、第１図と同じ部
品には同一番号を付した。By the way, in the embodiment described above, the case where the present invention is applied to the vertical furnace 1 is shown, but as shown in FIG. 4, it can also be applied to the horizontal furnace 12. In FIG. 4, the same parts as in FIG. 1 are given the same numbers.
発明の効果
上記本発明の燃焼法によると、ＮＯｘ還元した後の、し
かも完全燃焼域前の燃焼排ガスを補助バーナにより加熱
するので、完全燃焼域における燃焼が完結し、従って排
ガス中に含まれる未燃分を大幅に減少させることができ
る。Effects of the Invention According to the above combustion method of the present invention, the combustion exhaust gas after NOx reduction and before the complete combustion zone is heated by the auxiliary burner, so combustion in the complete combustion zone is completed, and therefore, the unused gas contained in the exhaust gas is Fuel consumption can be significantly reduced.
第１図〜第３図は本発明の一実施例を示？ｌしので、第
１図は装置の概略構成を示Ｖ所面図、第２図は完全燃焼
域の温度の影響を示づグラフ、第３図は補助バーナの効
果を示すグラフ、第４図は他の装置に適用した場合の概
略構成を示す断面図、第５図及び第６（さ１は従来例の
慨略肖成を示す断面図である。
２・・・１次空気、３・・・１次燃料、４・・・主バー
ナ、５・・・２次燃料、６・・・２次燃料供給ノズル、
７・・・補助空気、８・・・補助燃料、９・・・補助バ
ーブ、１０・・・２次空気、１１・・・２次空気供給ノ
ズル代理人 森 本 義 弘
第１図
１σ−２パ喝
３ン）；広プ；＊）或−２シ区１（ｏり第４図
第５因
第を図
Ｚ３ Ｚφ1 to 3 show an embodiment of the present invention. Therefore, Figure 1 shows the schematic configuration of the device, Figure 2 is a graph showing the influence of temperature in the complete combustion region, Figure 3 is a graph showing the effect of the auxiliary burner, and Figure 4. Figures 5 and 6 are cross-sectional views showing a schematic configuration when applied to other devices. ...Primary fuel, 4...Main burner, 5...Secondary fuel, 6...Secondary fuel supply nozzle,
7... Auxiliary air, 8... Auxiliary fuel, 9... Auxiliary barb, 10... Secondary air, 11... Secondary air supply nozzle agent Yoshihiro Morimoto Figure 1 1σ-2 Paku 3); wide; *) or -2 shi 1
Claims (1)
して上記排ガス中に残存する酸素で不完全燃焼させてＮ
Ｏｘを還元し、その後流に２次空気を供給して未燃分を
燃焼させるＮＯｘ抑制燃焼法において、ＮＯｘを還元し
た後で且つ２次空気の供給前に補助バーナを設けて排ガ
スの温度低下を防止することを特徴とするＮＯｘ抑制燃
焼法。 ２、補助バーナに供給する燃料間を全供給燃料量の５〜
２０％の範囲とすることを特徴とする特許請求の範囲第
１項記載のＮＯｘ抑制燃焼法。 ３、補助バーナにおける空気比を０．８５〜１．１の範
囲とすることを特徴とする特許請求の範囲第１項又は第
２項記載のＮＯｘ抑制燃焼法。[Claims] 1. A secondary fuel is supplied into the combustion exhaust gas after the combustion of the primary fuel, and the oxygen remaining in the exhaust gas is used to cause incomplete combustion.
In the NOx suppression combustion method, which reduces Ox and supplies secondary air to its wake to combust unburned matter, an auxiliary burner is installed after reducing NOx and before supplying the secondary air to lower the temperature of the exhaust gas. A NOx suppression combustion method characterized by preventing. 2. The amount of fuel supplied to the auxiliary burner is 5 to 5 of the total amount of fuel supplied.
The NOx suppression combustion method according to claim 1, wherein the NOx suppression combustion method is within the range of 20%. 3. The NOx suppression combustion method according to claim 1 or 2, characterized in that the air ratio in the auxiliary burner is in the range of 0.85 to 1.1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22965285A JPS6287707A (en) | 1985-10-14 | 1985-10-14 | Nox control combustion method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22965285A JPS6287707A (en) | 1985-10-14 | 1985-10-14 | Nox control combustion method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6287707A true JPS6287707A (en) | 1987-04-22 |
| JPH0518003B2 JPH0518003B2 (en) | 1993-03-10 |
Family
ID=16895553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22965285A Granted JPS6287707A (en) | 1985-10-14 | 1985-10-14 | Nox control combustion method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6287707A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02272207A (en) * | 1988-09-10 | 1990-11-07 | Kansai Electric Power Co Inc:The | Water tube boiler and burning method therefor |
| WO1994020791A1 (en) * | 1993-03-08 | 1994-09-15 | Kabushiki Kaisha Kobe Seiko Sho | Plasma fusion furnace and method of its operation |
| US6939125B2 (en) * | 2000-10-12 | 2005-09-06 | Asahi Glass Company, Limited | Method for reducing nitrogen oxides in combustion gas from combustion furnace |
| US7168947B2 (en) * | 2004-07-06 | 2007-01-30 | General Electric Company | Methods and systems for operating combustion systems |
| JP2012052750A (en) * | 2010-09-02 | 2012-03-15 | Miura Co Ltd | Method of purifying combustion gas, and combustion device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS572903A (en) * | 1980-06-10 | 1982-01-08 | Babcock Hitachi Kk | Low nox combustion equipment |
| JPS5837408A (en) * | 1981-08-28 | 1983-03-04 | Kawasaki Heavy Ind Ltd | Pulverized coal combustion method |
| JPS58187712A (en) * | 1982-04-27 | 1983-11-02 | Hitachi Zosen Corp | Nox suppression three-step burning method |
-
1985
- 1985-10-14 JP JP22965285A patent/JPS6287707A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS572903A (en) * | 1980-06-10 | 1982-01-08 | Babcock Hitachi Kk | Low nox combustion equipment |
| JPS5837408A (en) * | 1981-08-28 | 1983-03-04 | Kawasaki Heavy Ind Ltd | Pulverized coal combustion method |
| JPS58187712A (en) * | 1982-04-27 | 1983-11-02 | Hitachi Zosen Corp | Nox suppression three-step burning method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02272207A (en) * | 1988-09-10 | 1990-11-07 | Kansai Electric Power Co Inc:The | Water tube boiler and burning method therefor |
| JPH0470523B2 (en) * | 1988-09-10 | 1992-11-11 | Kansai Denryoku Kk | |
| WO1994020791A1 (en) * | 1993-03-08 | 1994-09-15 | Kabushiki Kaisha Kobe Seiko Sho | Plasma fusion furnace and method of its operation |
| US6939125B2 (en) * | 2000-10-12 | 2005-09-06 | Asahi Glass Company, Limited | Method for reducing nitrogen oxides in combustion gas from combustion furnace |
| US7168947B2 (en) * | 2004-07-06 | 2007-01-30 | General Electric Company | Methods and systems for operating combustion systems |
| JP2012052750A (en) * | 2010-09-02 | 2012-03-15 | Miura Co Ltd | Method of purifying combustion gas, and combustion device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0518003B2 (en) | 1993-03-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |