JPH07133905A - Low-nitrogen oxide generation alternating burning method - Google Patents
Low-nitrogen oxide generation alternating burning methodInfo
- Publication number
- JPH07133905A JPH07133905A JP5281235A JP28123593A JPH07133905A JP H07133905 A JPH07133905 A JP H07133905A JP 5281235 A JP5281235 A JP 5281235A JP 28123593 A JP28123593 A JP 28123593A JP H07133905 A JPH07133905 A JP H07133905A
- Authority
- JP
- Japan
- Prior art keywords
- heat storage
- layer
- furnace
- low
- way catalyst
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は窒素酸化物低発生交番燃
焼方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-nitrogen oxide generation alternating combustion method.
【０００２】[0002]
【従来技術】蓄熱層を有する二ツのバーナ部を一組とし
て交互に切替燃焼させる交番燃焼バーナは、一方が燃焼
した排ガスの顕熱を、他方の蓄熱層が回収し、次にその
蓄熱層を通過する燃焼用空気が回収された熱によって充
分に予熱されることで間接式熱交換装置と比較して高い
予熱空気が得られて非常に高いエネルギ効率が得られ
る。2. Description of the Related Art In an alternating combustion burner in which two burner sections having a heat storage layer are alternately switched and burned as one set, the sensible heat of the exhaust gas burned by one is recovered by the other heat storage layer and then the heat storage layer is recovered. Since the combustion air passing through the tank is sufficiently preheated by the recovered heat, higher preheated air is obtained as compared with the indirect heat exchange device, and very high energy efficiency is obtained.
【０００３】[0003]
【発明が解決しようとする課題】前記した交番燃焼バー
ナに於ける燃焼法は、予熱空気温度が高く窒素酸化物
（ＮＯX）の濃度が高くなる課題がある。これを解決す
るための一ツの方法として、空気を絞って、つまりガス
リッチ側で運転する場合も考えられるが、その場合、未
燃分が発生して炉効率の低下と有害物質の放散の課題が
ある。SUMMARY OF THE INVENTION An object] in the combustion method in alternate combustion burner mentioned above, there is a concentration increases problems of preheated air temperature is high nitrogen oxides (NO X). One way to solve this is to squeeze the air, that is, to operate on the gas-rich side, but in that case, unburned components are generated, which reduces the efficiency of the furnace and the emission of harmful substances. There is.
【０００４】[0004]
【課題を解決するための手段】前記課題を解決するため
に、本発明は、蓄熱層を有する二ツのバーナ部を一組と
して交互に切替燃焼させる交番燃焼バーナの前記各バー
ナ部の蓄熱層に三元触媒層を設け、前記三元触媒層の活
性条件に合わせるように、炉内空気比を０．９８〜１．
０２に調整して燃焼させることを特徴とするものであ
る。In order to solve the above problems, the present invention relates to a heat storage layer of each burner section of an alternating combustion burner in which two burner sections having a heat storage layer are alternately switched and burned as one set. Is provided with a three-way catalyst layer, and the in-furnace air ratio is set to 0.98 to 1. so as to match the activation condition of the three-way catalyst layer.
It is characterized in that it is adjusted to 02 and burned.
【０００５】また、本発明は蓄熱層を有する二ツのバー
ナ部を一組として交互に切換燃焼させる交番燃焼バーナ
の前記各バ−ナ部の蓄熱層に三元触媒層を設けると共に
前記各蓄熱層入口部に調整気体導入部を設け、炉内で酸
化性雰囲気操業を行うときは、前記調整気体導入部から
調整用ガスを導入して、前記蓄熱層に流入する酸化性排
ガスを前記三元触媒層の活性浄化条件に合わせた蓄熱反
応を実行して排気することを特徴とするものである。Further, according to the present invention, a three-way catalyst layer is provided in the heat storage layer of each burner portion of the alternating combustion burner for alternately switching and combusting two burner portions having a heat storage layer as one set, and each heat storage layer is provided. When the adjusted gas introducing part is provided at the layer inlet part and the oxidizing atmosphere operation is performed in the furnace, the adjusting gas is introduced from the adjusted gas introducing part, and the oxidizing exhaust gas flowing into the heat storage layer is added to the three-dimensional element. It is characterized in that a heat storage reaction according to the active purification condition of the catalyst layer is executed and exhausted.
【０００６】また、本発明は、炉内で還元性雰囲気操業
を行うときは、調整気体導入部から調整用空気を導入し
て、前記蓄熱層に流入する還元性排ガスを、前記三元触
媒層の活性浄化条件に合わせた蓄熱反応を実行して排気
することを特徴とするものである。Further, according to the present invention, when the reducing atmosphere operation is carried out in the furnace, the adjusting air is introduced from the adjusting gas introducing portion to reduce the reducing exhaust gas flowing into the heat storage layer to the three way catalyst layer. It is characterized in that the heat storage reaction is executed in accordance with the active purification conditions of and the exhaust is performed.
【０００７】また、本発明は、炉内からの排ガス温度が
７００℃を超えるときは、三元触媒層を蓄熱層によって
サンドイッチすることを特徴とするものである。The present invention is also characterized by sandwiching the three-way catalyst layer with a heat storage layer when the temperature of the exhaust gas from the furnace exceeds 700 ° C.
【０００８】また、本発明は、炉内からの排ガス温度が
６００℃以下のときは、最上層に三元触媒層に構成した
ことを特徴とするものである。Further, the present invention is characterized in that when the temperature of the exhaust gas from the furnace is 600 ° C. or lower, a three-way catalyst layer is formed as the uppermost layer.
【０００９】また、本発明は蓄熱層入口部にＯ2センサ
を装置して、Ｏ2センサ排ガスによって調整気体導入部
から導入するガス又は空気の選択及びその導入量の制御
を行なうことを特徴とするものである。Further, the present invention provides a feature that controls the by device O 2 sensor to the heat storage layer inlet unit, O 2 Selection of gas or air is introduced from the control gas introduction portion by the sensor the exhaust gas and the quantity incorporated To do.
【００１０】[0010]
【作用】排ガスの性状を三元触媒層の活性条件に合わせ
るように炉内空気を調整する。又は炉内からの排ガス中
に、三元触媒層の活性条件に合わせるように、ガス又は
空気の調整気体を噴出する。しかして、適量のガス又は
空気を混合した排ガスは蓄熱層内で蓄熱反応してから排
出されるが、この時の排ガスは、低ＮＯXであり、また
有害物質を含まない。[Function] The air in the furnace is adjusted so that the properties of the exhaust gas match the activation conditions of the three-way catalyst layer. Alternatively, the adjusted gas of gas or air is jetted into the exhaust gas from the furnace so as to match the activation condition of the three-way catalyst layer. Exhaust gas mixed with an appropriate amount of gas or air undergoes heat storage reaction in the heat storage layer and is then discharged. At this time, the exhaust gas has low NO x and does not contain harmful substances.
【００１１】[0011]
【実施例】符号１は蓄熱層２を有する二ツのバーナ部
Ａ，Ｂを一組として交互に切換燃焼させる交番燃焼バー
ナである。該交番燃焼バーナ１の前記各バーナ部Ａ，Ｂ
の蓄熱層２に三元触媒層３を設けると共に前記各蓄熱層
入口部には調整気体導入部４を設けると共に、場合によ
って前記畜熱層入口部にＯ2センサを設ける。また、炉
内５からの排ガスの温度に応じて例えば排ガス温度が７
００℃を超えるときは、図２のように、蓄熱層２によっ
て三元触媒層３をサンドイッチ構成とし、６００℃台以
下の場合には、図３のように、最上層に三元触媒層３を
構成する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 is an alternating combustion burner in which two burner portions A and B having a heat storage layer 2 are alternately switched and burned as one set. The burner parts A and B of the alternating combustion burner 1
The heat storage layer 2 is provided with a three-way catalyst layer 3, the inlets of the respective heat storage layers are provided with a regulated gas introducing portion 4, and an O 2 sensor is optionally provided at the inlet of the heat storage layer. Further, depending on the temperature of the exhaust gas from the furnace 5, for example, the exhaust gas temperature is 7
When the temperature exceeds 00 ° C., the three-way catalyst layer 3 is sandwiched by the heat storage layer 2 as shown in FIG. 2, and when the temperature is 600 ° C. or lower, as shown in FIG. Make up.
【００１２】しかして、炉内５で酸化性操業を行うとき
は、調整気体導入部４から調整用ガスを、蓄熱層２中の
三元触媒層３の活性条件に合わせるように噴出して混合
する。また、炉内５で還元性操業を行う時は、調整用気
体として、調整用空気を、調整気体導入部４から噴出さ
せて、蓄熱層２中の三元触媒層３の活性条件に合わせる
ようにする。かかる際、排気温度か６００℃台以下の場
合には、最初に三元触媒層３を通過させて反応浄化させ
た後、蓄熱層２を通過させ蓄熱後排気すると、三元触媒
反応後の段階的蓄熱という効果的な手段を実行できる
が、排ガス温度が７００℃以上の場合には、図２に示す
ように、三元触媒層３をサンドイッチにして実行する。
また、蓄熱層入口部にＯ2センサを装置してＯ2センサに
よる調整用気体の選択とその量の制御をコントロールす
ることができる。三元触媒層３の活性条件は、図４に示
すように、空気比λとして、λ＝０．９８〜１．０２の
範囲であり、そのベスト値は、λ＝０．９９である。か
かる空気比λは、三元触媒層３の入口の空気比であり、
炉内５の空気比λＦはいかようにでも設定できる。従っ
て、三元触媒層３のλは０．９９近傍がベストである
が、被処理材の加熱雰囲気条件が材質上、特に指定され
ていなければ（例えば、λＦが特に問われない場合）、
はじめから炉内５のλＦを０．９９に（０．９８〜１．
０２の範囲）に合わせておけば、調整用気体の混入が必
要がないということもできる。しかしながら、被処理材
によりλＦが指定される場合は、調整用気体が必要とな
る。三元触媒層３の通過後の排ガス中のＮＯX濃度は、
図４に示す通り、数ｐｐｍ〜数十ｐｐｍになる。しかも
ＣＯ等の有害物質を含まない。以上の燃焼をバーナ部
Ａ，Ｂによって、例えば６０秒毎に切替燃焼を実行する
ものである。However, when the oxidizing operation is performed in the furnace 5, the adjusting gas is introduced from the adjusting gas introducing portion 4 so as to be mixed so as to match the activation condition of the three-way catalyst layer 3 in the heat storage layer 2. To do. Further, when performing reducing operation in the furnace 5, adjusting air is ejected from the adjusting gas introducing portion 4 as adjusting gas to match the activation condition of the three-way catalyst layer 3 in the heat storage layer 2. To At this time, if the exhaust temperature is in the range of 600 ° C. or lower, the three-way catalyst layer 3 is first passed to purify the reaction, and then the heat storage layer 2 is passed and heat is exhausted after the heat storage. Although an effective means of thermal storage can be performed, when the exhaust gas temperature is 700 ° C. or higher, the three-way catalyst layer 3 is sandwiched as shown in FIG.
Further, an O 2 sensor can be provided at the inlet of the heat storage layer to control the selection of the adjusting gas and the control of the amount thereof by the O 2 sensor. As shown in FIG. 4, the activation condition of the three-way catalyst layer 3 is in the range of λ = 0.98 to 1.02 as the air ratio λ, and the best value thereof is λ = 0.99. The air ratio λ is the air ratio at the inlet of the three-way catalyst layer 3,
The air ratio λF in the furnace 5 can be set arbitrarily. Therefore, λ of the three-way catalyst layer 3 is best near 0.99, but if the heating atmosphere condition of the material to be treated is not specified in terms of material (for example, when λF is not particularly required),
From the beginning, the λF of the furnace 5 was set to 0.99 (0.98 to 1.
It can be said that the adjustment gas does not need to be mixed if it is adjusted to the range (02). However, when λF is specified by the material to be processed, the adjusting gas is required. The NO x concentration in the exhaust gas after passing through the three-way catalyst layer 3 is
As shown in FIG. 4, it becomes several ppm to several tens of ppm. Moreover, it does not contain harmful substances such as CO. The above combustion is performed by the burner units A and B, for example, switching combustion is performed every 60 seconds.
【００１３】[0013]
【発明の効果】本発明は以上の通り、交番燃焼バーナに
於いて、排ガスを三元触媒層の活性条件に合わせて制御
して蓄熱反応を実行させ、窒素酸化物の発生の抑制と予
熱による熱効率の向上、更には有害物質の排出の防止と
いう優れた効果をもたらすものである。INDUSTRIAL APPLICABILITY As described above, according to the present invention, in an alternating combustion burner, exhaust gas is controlled in accordance with the activation condition of the three-way catalyst layer to carry out a heat storage reaction, thereby suppressing generation of nitrogen oxides and preheating. It has an excellent effect of improving the thermal efficiency and preventing the emission of harmful substances.
【００１４】[0014]
【図１】交番燃焼バーナの説明図である。FIG. 1 is an explanatory diagram of an alternating combustion burner.
【図２】要部拡大説明図である。FIG. 2 is an enlarged explanatory view of a main part.
【図３】要部拡大説明図である。FIG. 3 is an enlarged explanatory view of a main part.
【図４】ＮＯX特性説明図である。FIG. 4 is an explanatory diagram of NO X characteristics.
１ 交番燃焼バーナ ２ 蓄熱層 ３ 三元触媒層 ４ 調整気体導入部 ５ 炉内 1 Alternate combustion burner 2 Heat storage layer 3 Three-way catalyst layer 4 Regulated gas introduction part 5 Inside the furnace
Claims (6)
して交互に切替燃焼させる交番燃焼バーナの前記各バー
ナ部の蓄熱層に三元触媒層を設け、前記三元触媒層の活
性条件に合わせるように、炉内空気比を０．９８〜１．
０２に調整して燃焼させることを特徴とする窒素酸化物
低発生交番燃焼方法。1. A three-way catalyst layer is provided in the heat storage layer of each burner part of an alternating combustion burner that alternately switches and burns a pair of two burner parts having a heat storage layer, and activation conditions of the three-way catalyst layer are provided. So that the air ratio in the furnace is 0.98 to 1.
A low-nitrogen oxide low-occurrence alternating combustion method, characterized in that it is adjusted to 02 and burned.
して交互に切替燃焼させる交番燃焼バーナの前記各バー
ナ部の蓄熱層に三元触媒層を設けると共に前記各蓄熱層
入口部に調整気体導入部を設け、炉内で酸化性雰囲気操
業を行うときは、前記調整気体導入部から調整用ガスを
導入して、前記蓄熱層に流入する酸化性排ガスを前記三
元触媒層の活性浄化条件に合わせた蓄熱反応を実行して
排気することを特徴とする窒素酸化物低発生交番燃焼方
法。2. A three-way catalyst layer is provided in the heat storage layer of each burner part of an alternating combustion burner that alternately switches and burns a set of two burner parts each having a heat storage layer, and adjustment is made at each heat storage layer inlet part. When an oxidizing atmosphere operation is performed in the furnace by providing a gas introduction part, an adjustment gas is introduced from the adjustment gas introduction part to oxidize the oxidizing exhaust gas flowing into the heat storage layer into active purification of the three-way catalyst layer. A low-nitrogen oxide generation alternating combustion method characterized by performing a heat storage reaction according to conditions and exhausting the heat.
調整気体導入部から調整用空気を導入して、前記蓄熱層
に流入する還元性排ガスを、前記三元触媒層の活性浄化
条件に合わせた蓄熱反応を実行して排気することを特徴
とする第２項記載の窒素酸化物低発生交番燃焼方法。3. When performing a reducing atmosphere operation in a furnace,
Introducing the adjustment air from the adjustment gas introduction unit, the reducing exhaust gas flowing into the heat storage layer is exhausted by performing a heat storage reaction in accordance with the active purification conditions of the three-way catalyst layer. The method for alternating combustion of low nitrogen oxides according to item 2.
るときは、三元触媒層を蓄熱層によってサンドイッチす
ることを特徴とする第２項記載の窒素酸化物低発生交番
燃焼装置。4. The low-nitrogen oxide generation alternating combustion apparatus according to claim 2, wherein the three-way catalyst layer is sandwiched by a heat storage layer when the temperature of the exhaust gas from the furnace exceeds 700 ° C.
のときは、最上層に三元触媒層に構成したことを特徴と
する第２項記載の窒素酸化物低発生交番燃焼方法。5. The method of alternating combustion with low generation of nitrogen oxides according to claim 2, wherein when the temperature of the exhaust gas from the inside of the furnace is 600 ° C. or lower, a three-way catalyst layer is formed as the uppermost layer.
Ｏ2センサによって調整気体導入部から導入するガス又
は空気の選択及びその導入量の制御を行うことを特徴と
する第２項記載の窒素酸化物低発生交番燃焼方法。6. A 0 2 sensor is provided at the heat storage layer inlet,
3. The low-nitrogen-oxide low-generation alternating combustion method according to claim 2, wherein the gas or air introduced from the adjusted gas introduction part is selected by an O 2 sensor and the introduction amount is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5281235A JPH07133905A (en) | 1993-11-10 | 1993-11-10 | Low-nitrogen oxide generation alternating burning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5281235A JPH07133905A (en) | 1993-11-10 | 1993-11-10 | Low-nitrogen oxide generation alternating burning method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07133905A true JPH07133905A (en) | 1995-05-23 |
Family
ID=17636250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5281235A Pending JPH07133905A (en) | 1993-11-10 | 1993-11-10 | Low-nitrogen oxide generation alternating burning method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07133905A (en) |
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-
1993
- 1993-11-10 JP JP5281235A patent/JPH07133905A/en active Pending
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| KR20190024867A (en) | 2016-07-04 | 2019-03-08 | 쥬가이로 고교 가부시키가이샤 | Industrial Furnace |
| CN108700293B (en) * | 2016-07-04 | 2020-05-22 | 中外炉工业株式会社 | Industrial furnace |
| JP2018115789A (en) * | 2017-01-17 | 2018-07-26 | 中外炉工業株式会社 | Heat storage type combustion facility |
| JP2022114244A (en) * | 2021-01-26 | 2022-08-05 | 中外炉工業株式会社 | Thermal storage type burning facility |
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