JP3045430B2 - Thermal storage burner - Google Patents
Thermal storage burnerInfo
- Publication number
- JP3045430B2 JP3045430B2 JP4332860A JP33286092A JP3045430B2 JP 3045430 B2 JP3045430 B2 JP 3045430B2 JP 4332860 A JP4332860 A JP 4332860A JP 33286092 A JP33286092 A JP 33286092A JP 3045430 B2 JP3045430 B2 JP 3045430B2
- Authority
- JP
- Japan
- Prior art keywords
- burner
- gas
- heat storage
- combustion gas
- 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.)
- Expired - Lifetime
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Gas Burners (AREA)
- Air Supply (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は工業炉で使用するバーナ
ーに関する。The present invention relates to a burner used in an industrial furnace.
【０００２】[0002]
【従来の技術】近年、工業炉において燃焼排ガスから相
当量の熱量を回収して熱効率を高める方法として蓄熱式
バーナーが注目されている。これは各々に蓄熱体を有す
る一対以上のバーナーを交互に燃焼させて、その燃焼ガ
スを燃焼させていないバーナー側の蓄熱体を通して排出
するようにし、蓄熱体で蓄熱された燃焼ガスの顕熱を利
用して燃焼用空気を予熱するものである。2. Description of the Related Art In recent years, regenerative burners have attracted attention as a method of recovering a considerable amount of heat from combustion exhaust gas in an industrial furnace to increase thermal efficiency. In this method, a pair of or more burners each having a heat storage body are alternately burned, and the combustion gas is discharged through a heat storage body on a burner side that is not burning. It is used to preheat combustion air.
【０００３】このように燃焼用空気を予熱することによ
り、燃焼ガスの火炎の温度を上昇させるとともに熱効率
を向上することができるが、窒素酸化物（ＮＯｘ）が多
量に発生するという欠点がある。この欠点を解決する従
来の技術としては、例えば、特開昭６２−１５５９２２
号公報に示されているように燃焼している部分に水また
は水蒸気を供給する方法がある。[0003] By preheating the combustion air in this way, the temperature of the flame of the combustion gas can be raised and the thermal efficiency can be improved, but there is a drawback that a large amount of nitrogen oxide (NOx) is generated. Conventional techniques for solving this drawback include, for example, Japanese Patent Application Laid-Open No. Sho 62-155922.
There is a method of supplying water or water vapor to a burning part as shown in Japanese Patent Application Laid-Open Publication No. HEI 10-115,086.
【０００４】[0004]
【発明が解決しようとする課題】燃焼している部分に水
または水蒸気を供給すると、火炎から熱を奪ってしまい
熱効率が低下するという問題があった。本発明は、上記
のような事情に着目してなされたものであって、その目
的は熱効率を低下させることなく窒素酸化物（ＮＯｘ）
の排出を抑制することができる蓄熱式バーナーを提供し
ようとするものである。When water or water vapor is supplied to a burning part, heat is taken from the flame and the heat efficiency is reduced. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce nitrogen oxides (NOx) without lowering thermal efficiency.
It is an object of the present invention to provide a regenerative burner capable of suppressing the emission of waste.
【０００５】[0005]
【課題を解決するための手段】本発明は工業炉の炉体に
配設され、各々に蓄熱体を内蔵する一対以上のバーナー
を交互に燃焼させる蓄熱式バーナーにおいて、蓄熱体を
通過する燃焼ガス中に尿素またはアンモニア（ＮＨ3 ）
ガスを吹込む手段を設けるとともに、燃焼ガスの排出方
向から見て、アンモニアガス吹込み手段の下流側に触媒
兼用構造の蓄熱体を有することを特徴とする。SUMMARY OF THE INVENTION The present invention relates to a regenerative burner which is disposed in a furnace body of an industrial furnace and alternately burns a pair of burners each having a built-in regenerator. Urea or ammonia (NH 3 ) in
It is characterized in that a means for injecting gas is provided, and a heat storage element having a structure also serving as a catalyst is provided on the downstream side of the means for injecting ammonia gas when viewed from the discharge direction of combustion gas.
【０００６】[0006]
【作用】蓄熱体を通過した燃焼ガスに尿素またはアンモ
ニア（ＮＨ3 ）ガスを吹込むと ２ＮＯ＋Ｏ2 →２ＮＯ2 ６ＮＯ2 ＋８ＮＨ3 →７Ｎ2 ＋１２Ｈ2 Ｏ の反応を生じ、下流側に設置した触媒を通過した後の燃
焼ガス中のＮＯｘは大幅に低減される。例えば、燃焼用
空気温度が１０００℃の場合、バーナーで発生するＮＯ
ｘは７００ppm 以上となるが、本発明によるとそれは３
５〜１０５ppm と大幅に低減し、大気汚染防止法によっ
て規制されている許容排出量（１２０ppm)を十分に達成
できるのである。When urea or ammonia (NH 3 ) gas is blown into the combustion gas that has passed through the regenerator, a reaction of 2NO + O 2 → 2NO 2 6NO 2 + 8NH 3 → 7N 2 + 12H 2 O occurs, and the catalyst installed on the downstream side is removed. NOx in the combustion gas after passing is greatly reduced. For example, when the combustion air temperature is 1000 ° C., NO generated by the burner
Although x is 700 ppm or more, according to the present invention, it is 3 ppm.
It is significantly reduced to 5 to 105 ppm, and the allowable emission amount (120 ppm) regulated by the Air Pollution Control Law can be sufficiently achieved.
【０００７】[0007]
【実施例】以下、本発明の一実施例を図面により詳細に
説明する。図１は本発明の一実施例を示す構成断面図で
あり、一対のバーナーの内片方のバーナーについて示し
ており、バーナー１は蓄熱体２を有する蓄熱式バーナー
である。この蓄熱式バーナーを燃焼している時は、蓄熱
体端部３より燃焼用空気としての冷風が入り、蓄熱体２
でこの冷風が予熱されノズル４から供給された燃料ガス
と混合し、燃焼し、バーナーポート５より燃焼ガスがフ
レームとなって炉内（図示しない）へ供給される。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view showing the configuration of one embodiment of the present invention, showing one of a pair of burners, and a burner 1 is a regenerative burner having a regenerator 2. When the regenerative burner is burning, cool air as combustion air enters from the regenerator end 3, and the regenerator 2 burns.
The cold air is preheated, mixed with the fuel gas supplied from the nozzle 4 and burned, and the combustion gas is supplied from the burner port 5 into the furnace (not shown) as a frame.
【０００８】この蓄熱式バーナーを燃焼していない時
は、炉内の燃焼ガスをバーナーポート５より吸引し蓄熱
体２を通過し蓄熱体端部３から排出され、煙突等を経て
大気中に放散される。蓄熱体２は燃焼ガス温度が２００
〜３５０℃となる位置に空間６を形成するよう２ブロッ
ク２ａ，２ｂに分かれている。この空間６にはリング状
ヘッダーを有するアンモニアガスの吹込みノズル７が取
り付けられており、この蓄熱式バーナーを燃焼していな
い時にアンモニアガスが吹込まれるシステムとなってい
る。When the regenerative burner is not burning, the combustion gas in the furnace is sucked from the burner port 5, passes through the regenerator 2, is discharged from the regenerator end 3, and is radiated to the atmosphere via a chimney or the like. Is done. The heat storage body 2 has a combustion gas temperature of 200
It is divided into two blocks 2a and 2b so as to form the space 6 at a position where the temperature is up to 350 ° C. Attached to this space 6 is an ammonia gas injection nozzle 7 having a ring-shaped header, so that ammonia gas is injected when the regenerative burner is not burning.
【０００９】本発明による実験結果を図２に示すが、燃
焼ガス温度とＮＯｘ低減率の関係は燃焼ガス温度が２０
０〜３５０℃の温度域にアンモニアガスを吹込む時、Ｎ
Ｏｘ低減効果が最も大きく、またアンモニアガス吹込み
構造は燃焼排ガスとの均一混合を図るためリング状と
し、全周に亘って等ピッチに設けられた複数個の吹込み
ノズルから吹込む構造とすることが望ましい。アンモニ
アガスが吹込まれた燃焼排ガスは、触媒作用と空気予熱
作用を兼用する蓄熱体２ｂを通り蓄熱体端部３から排出
される。FIG. 2 shows the experimental results according to the present invention. The relationship between the combustion gas temperature and the NOx reduction rate is as follows.
When ammonia gas is blown into the temperature range of 0 to 350 ° C, N
The Ox reduction effect is the greatest, and the ammonia gas injection structure is a ring-shaped structure for uniform mixing with the combustion exhaust gas, and has a structure in which a plurality of injection nozzles are provided at equal pitches over the entire circumference. It is desirable. The combustion exhaust gas into which the ammonia gas has been injected is discharged from the heat storage body end portion 3 through the heat storage body 2b which has both a catalytic action and an air preheating action.
【００１０】蓄熱体２ａは燃焼ガスの顕熱を蓄熱するた
めのものであり、燃焼ガスと反応しないこと及び予熱さ
れる燃焼用空気に悪影響を及ぼさないものであれば、い
かなる材質であっても使用可能であるが、耐熱性、耐蝕
性、及び耐熱衝撃性に優れていることが要求される。ま
た、構造面では比表面積が大きく圧力損失の小さいもの
が望ましい。これらの観点から、材質はセラミックス、
アルミナ、耐熱金属等が使用され、形状はハニカム状、
ボール状、ナゲット等いずれの形状でもよい。The heat storage body 2a is for storing the sensible heat of the combustion gas, and may be made of any material as long as it does not react with the combustion gas and does not adversely affect the preheated combustion air. Although it can be used, it is required to have excellent heat resistance, corrosion resistance, and thermal shock resistance. Further, in terms of structure, it is desirable that the specific surface area is large and the pressure loss is small. From these viewpoints, the material is ceramics,
Alumina, heat-resistant metal, etc. are used, the shape is honeycomb,
Any shape such as a ball shape and a nugget may be used.
【００１１】尚、蓄熱体２ｂは触媒兼用とするため、ア
ルミナ、セラミックス等にバナジウム、クロム等の触媒
成分を均一に付着させても混合成型したものでもよい。
蓄熱体２ｂの形状は発明者はハニカム状で効果を確認し
たが、特に形状にこだわるものではない。尚、バーナー
としては前記実施例に限定されるものではなく、熱処理
炉等で多く使用されているラジアントチューブバーナー
にも適用可能である。また、本発明による実験はアンモ
ニアガスを使用したが、これに限定されるものではな
く、同一効果を有する尿素を使用してもよいことは勿論
である。Since the heat storage element 2b also serves as a catalyst, a catalyst component such as vanadium or chromium may be uniformly adhered to alumina or ceramics, or may be mixed and molded.
The inventor has confirmed the effect of the shape of the heat storage body 2b in a honeycomb shape, but the shape is not particularly limited. It should be noted that the burner is not limited to the above-described embodiment, but can be applied to a radiant tube burner that is often used in a heat treatment furnace or the like. In the experiment according to the present invention, ammonia gas was used. However, the present invention is not limited to this, and it goes without saying that urea having the same effect may be used.
【００１２】[0012]
【発明の効果】本発明によれば、バーナーの熱効率を低
下することなく、窒素酸化物（ＮＯｘ）を低減できるた
め大気汚染防止法の規制値を達成できるとともに、従来
の熱交換器を設置している工業炉に比べ、１５〜３０％
の省エネルギーを図ることができるため、ランニングコ
ストの大幅な低減が図れるという優れた効果を発揮す
る。According to the present invention, nitrogen oxides (NOx) can be reduced without lowering the thermal efficiency of the burner, so that the regulation value of the Air Pollution Control Law can be achieved, and a conventional heat exchanger can be installed. 15-30% compared to industrial furnaces
Therefore, an excellent effect that the running cost can be significantly reduced can be achieved.
【図１】本発明に係る蓄熱式バーナーの実施例を示す断
面図である。FIG. 1 is a sectional view showing an embodiment of a regenerative burner according to the present invention.
【図２】本発明に係る蓄熱式バーナーの燃焼ガス温度と
ＮＯｘ低減率の関係の図表である。FIG. 2 is a table showing the relationship between the combustion gas temperature and the NOx reduction rate of the regenerative burner according to the present invention.
【図３】従来型蓄熱式バーナーの断面図である。FIG. 3 is a sectional view of a conventional regenerative burner.
【図４】（ａ）及び（ｂ）は蓄熱式バーナー燃焼システ
ムの概念図である。FIGS. 4A and 4B are conceptual diagrams of a regenerative burner combustion system.
１ バーナー ２ 蓄熱体 ３ 蓄熱体端部 ４ 燃料供給ノズル ５ バーナーポート ６ 空間部 ７ アンモニアガス吹込みノズル DESCRIPTION OF SYMBOLS 1 Burner 2 Heat storage body 3 Heat storage body end part 4 Fuel supply nozzle 5 Burner port 6 Space part 7 Ammonia gas injection nozzle
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F23D 14/66 F23C 11/00 317 F23L 15/02 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) F23D 14/66 F23C 11/00 317 F23L 15/02
Claims (1)
を内蔵する一対以上のバーナーを交互に燃焼させる蓄熱
式バーナーにおいて、蓄熱体を通過する燃焼ガス中に尿
素またはアンモニア（ＮＨ3 ）ガスを吹込む手段を設け
るとともに、燃焼ガスの排出方向から見て、アンモニア
ガス吹込み手段の下流側に触媒兼用構造の蓄熱体を有す
ることを特徴とする蓄熱式バーナー。1. A regenerative burner disposed in a furnace body of an industrial furnace and alternately burning a pair of burners each containing a heat storage therein, wherein urea or ammonia (NH) is contained in a combustion gas passing through the heat storage. 3 ) A regenerative burner characterized by having a means for injecting gas, and having a regenerator having a structure which also serves as a catalyst, on the downstream side of the means for injecting ammonia gas when viewed from the exhaust direction of the combustion gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4332860A JP3045430B2 (en) | 1992-12-14 | 1992-12-14 | Thermal storage burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4332860A JP3045430B2 (en) | 1992-12-14 | 1992-12-14 | Thermal storage burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06185710A JPH06185710A (en) | 1994-07-08 |
| JP3045430B2 true JP3045430B2 (en) | 2000-05-29 |
Family
ID=18259616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4332860A Expired - Lifetime JP3045430B2 (en) | 1992-12-14 | 1992-12-14 | Thermal storage burner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3045430B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5739168B2 (en) | 2011-01-12 | 2015-06-24 | 日立オートモティブシステムズ株式会社 | Valve timing control device for internal combustion engine |
-
1992
- 1992-12-14 JP JP4332860A patent/JP3045430B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5739168B2 (en) | 2011-01-12 | 2015-06-24 | 日立オートモティブシステムズ株式会社 | Valve timing control device for internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06185710A (en) | 1994-07-08 |
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