JPS58187709A - Pulverized coal burning system utilizing nitrogen in coal - Google Patents
Pulverized coal burning system utilizing nitrogen in coalInfo
- Publication number
- JPS58187709A JPS58187709A JP6868582A JP6868582A JPS58187709A JP S58187709 A JPS58187709 A JP S58187709A JP 6868582 A JP6868582 A JP 6868582A JP 6868582 A JP6868582 A JP 6868582A JP S58187709 A JPS58187709 A JP S58187709A
- Authority
- JP
- Japan
- Prior art keywords
- coal
- nox
- ammonia
- combustion
- pulverized coal
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Solid-Fuel Combustion (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、微粉炭燃焼時に発生するNOxを低減する丸
めの石炭中窒素利用微粉炭燃焼方弐に関するものである
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulverized coal combustion method that utilizes nitrogen in rounded coal to reduce NOx generated during pulverized coal combustion.
燃焼火災中に生成するN Oxは、燃料中の窒素外く起
因する賜の(以下、7ユーエルNotと記す)と、空気
中の窒素に起因するもの(以下、サーマルN Oxと記
す)とに大別される。石炭燃焼時に発生するN Oxは
大部分がフューエルN Oxである。The NOx generated during a combustion fire can be divided into two types: thermal NOx, which is caused by nitrogen in the fuel (hereinafter referred to as 7UEL Not), and nitrogen generated in the air (hereinafter referred to as thermal NOx). Broadly classified. Most of the NOx generated during coal combustion is fuel NOx.
石炭中に存在する窒素外は、燃焼の一過程である熱分解
によって気体として揮発するものと、固体中に残留する
ものとに分れる。そして、熱分解時に気体として放出さ
れる窒素外には、シアンおよびアンモニア系の化合物が
含まれ、これら窒素化合物は高温高酸素雰囲気では酸化
されてN Oxとなる。しかし、アンモニアは適当な反
応温度。Nitrogen present in coal is divided into two types: one that volatilizes as a gas through thermal decomposition, which is a process of combustion, and the other that remains in solid form. In addition to the nitrogen released as a gas during thermal decomposition, cyanide and ammonia-based compounds are included, and these nitrogen compounds are oxidized to NOx in a high-temperature, high-oxygen atmosphere. However, ammonia has a suitable reaction temperature.
酸素濃度を設定すれば1通常の燃焼ガス中に存在する酸
素共存下でも選択的にNotを還元し窒素とする性質を
有する。If the oxygen concentration is set, it has the property of selectively reducing Not to nitrogen even in the presence of oxygen present in normal combustion gas.
従来、開発の進められてきた低N Ox燃焼技術は、2
段燃焼法、排ガス再循環法に代表されるもので、燃焼温
度を低下させる事によシ、サーマルNowの抑制に効果
がある。The low NOx combustion technology that has been developed so far is
These methods are typified by the staged combustion method and the exhaust gas recirculation method, and are effective in suppressing thermal Now by lowering the combustion temperature.
これに対して、アン’&−アは適当な条件下では酸素共
存下でも選択的にN Oxを還元し、窒素にするという
前述の性質を利用すれば、従来サーマルN Ox対策と
して開発された2段燃焼を改良し、フューエルNOx対
策用として、微粉炭燃焼の低N Ox化を図る事が可能
である。既に、2段燃焼管原理とする微粉炭燃焼バーナ
ーが開発されているが、厳しい環境規制を充分に満足す
るには、さらに低NOx化金回るための技術開発が必要
である。On the other hand, if AN'&-A utilizes the above-mentioned property of selectively reducing NOx to nitrogen even in the presence of oxygen under appropriate conditions, it can be used as a thermal NOx countermeasure. By improving the two-stage combustion, it is possible to reduce NOx in pulverized coal combustion as a fuel NOx countermeasure. A pulverized coal combustion burner based on the two-stage combustion tube principle has already been developed, but in order to fully satisfy the strict environmental regulations, it is necessary to further develop technology to reduce NOx.
本発明の目的は、微粉炭燃焼装置に於いて燃焼ガス中の
NOxを低減させる石炭中窒素利用微粉炭燃焼方式を提
供することにある。An object of the present invention is to provide a pulverized coal combustion system that uses nitrogen in coal to reduce NOx in combustion gas in a pulverized coal combustion apparatus.
本発明の要点は1石炭中の窒素分1kN Oxの還元に
利用し、NOxを低減させる事にある。The main point of the present invention is to reduce NOx by utilizing the nitrogen content in one coal to reduce 1kNOx.
石炭中に存在する窒素分のうち、燃焼の一過程である熱
分解時に気体として放出される化合物の一つに1アンモ
ニアが含まれておシ、これは高温高酸素雰囲気では酸化
されNOxとなる。ところが、適当な条件下では、酸素
共存下でも選択的にNOxを還元する性質を有する。Of the nitrogen present in coal, one of the compounds released as a gas during thermal decomposition, which is one of the combustion processes, contains 1 ammonia, which is oxidized and becomes NOx in a high-temperature, high-oxygen atmosphere. . However, under appropriate conditions, it has the property of selectively reducing NOx even in the presence of oxygen.
従って、NOxを低減させる一つの方法である、アンモ
ニアによる還元反応に用いるアンモニアの供給源として
石炭を用いる事が考えられる。Therefore, it is conceivable to use coal as a source of ammonia for use in the reduction reaction using ammonia, which is one method of reducing NOx.
即ち、主燃料として燃焼する石炭よシも、燃焼の一つの
過程である熱分解時にアンモニアを多量に発生する石炭
を選定し、その石炭からアンモニアを発生させて、主燃
料の石炭の燃焼から生じたNOxの還元に用いれば、低
N0xt−図る拳が可能となる。In other words, when it comes to coal that is burned as the main fuel, we select coal that generates a large amount of ammonia during pyrolysis, which is one of the combustion processes, and then generate ammonia from that coal. If used to reduce NOx, it becomes possible to achieve low NOxt.
この方法によると、主燃料の石炭の燃焼域は、NOxの
発生にかかわらず、完全燃焼をさせ、そこで発生したN
Oxを、アンモニアを多量に発生する石炭からのアンモ
ニアで還元する事が可能であシ、主燃料の石炭だけの燃
焼の場合の如<NOxの発生量を低減させるために、不
完全燃焼をさせ、そのため未燃分が増加するという事も
防げる。According to this method, the combustion zone of the main fuel coal is completely combusted regardless of the generation of NOx, and the N
It is possible to reduce Ox with ammonia from coal, which generates a large amount of ammonia. Therefore, it is possible to prevent the amount of unburned matter from increasing.
ま九一つの利点は、微粉炭燃焼装置K N Ox還元用
のアンモニア供給系を新たに設ける必要がなく、本来性
いている微粉炭の供給系を用いて。Another advantage is that there is no need to newly install an ammonia supply system for KNOx reduction in the pulverized coal combustion device, and the pulverized coal supply system that already exists can be used.
N Oxの還元剤の供給系として使用出来る事である。It can be used as a supply system for NOx reducing agent.
ところが、燃焼の一過程である熱分解時に発生するアン
モニア量は炭種によって異なる。従って、前述の技術を
実現させるには適当な石炭を選定し、NOxの還元剤と
して用いる必要がある。However, the amount of ammonia generated during thermal decomposition, which is a process of combustion, differs depending on the type of coal. Therefore, in order to realize the above technology, it is necessary to select an appropriate coal and use it as a NOx reducing agent.
以下、本発明の内容を第1図に、また、実施例を第2図
によシ説明する。Hereinafter, the content of the present invention will be explained with reference to FIG. 1, and an embodiment will be explained with reference to FIG. 2.
第1図は1石炭中の窒素分のアンモニアへの転換率を測
定したもので、該測定方法は1石英管の中に微粉炭を入
れ、加熱温度を約1000Cにした時に発生するアンモ
ニア量を、インドフェノール吸光光度法で定量した。炭
種KFi、オーストラリア炭、13i1内炭、中国炭を
選び、雰囲気酸素濃度は1%から6%とした。Figure 1 shows the measurement of the conversion rate of nitrogen to ammonia in one coal.The measurement method is to put pulverized coal in a quartz tube and measure the amount of ammonia generated when the heating temperature is about 1000C. , quantified by indophenol spectrophotometry. Coal types KFi, Australian coal, 13i1 internal coal, and Chinese coal were selected, and the atmospheric oxygen concentration was set from 1% to 6%.
いずれの炭種に於いて4.雰囲気酸素濃度が約3%で最
大値を示す。ところが、炭種によるアンモニアの転換率
は%国内炭人、中国炭Bでは約10%であるが、オース
トラリア炭Cでは約30%であシ、炭稽による違いが明
らかである。4 for any type of coal. The maximum value is reached when the atmospheric oxygen concentration is approximately 3%. However, the ammonia conversion rate depending on the type of coal is about 10% for domestic coal and Chinese coal B, but about 30% for Australian coal C, and there are obvious differences depending on the type of coal.
従って、第1図によれば主燃料として国内炭や中国炭を
用い、またNowの還元の九めのアンモニアを供給する
石炭としてオーストラリア炭を用いれば低N Oxの効
果がある事が判る。Therefore, according to Figure 1, it can be seen that if domestic coal or Chinese coal is used as the main fuel, and Australian coal is used as the coal that supplies ammonia, which is the ninth reduction factor in Now, a low NOx effect can be achieved.
第2図は、実際の燃焼炉の排ガス中のN Ox−の濃度
を測定し、主燃料として国内炭のみを用いた場合りと、
それにオーストラリア炭を加えた場合Eとを比較し丸も
のである。Figure 2 shows the results obtained by measuring the concentration of NOx in the exhaust gas of an actual combustion furnace and using only domestic coal as the main fuel.
When Australian charcoal is added to it, it is round compared to E.
国内炭のみの場合には、燃焼排ガス中のN Ox濃度は
雰囲気酸素濃度の増加と共に増加していくが、オースト
ラリア縦を加えた場合には、雰囲気酸素濃度が約3%の
所で燃焼排ガス中のNoxa度は蝦小値を示し、tた他
の雰囲気酸素濃度の所で本国内炭のみの燃焼時に発生す
るNOxの濃度よシも低い値を示した。When only domestic coal is used, the NOx concentration in the flue gas increases as the atmospheric oxygen concentration increases, but when Australian coal is added, the NOx concentration in the flue gas increases when the atmospheric oxygen concentration is approximately 3%. The NOx content of the plant showed a low value, and it also showed a low value compared to the NOx concentration generated when only domestic coal is burned at other atmospheric oxygen concentrations.
これは、オーストラリア炭から発生したアンモニアがN
Oxを還元し、燃焼排ガス中のN Ox濃度が低下し要
事を示す。This is because ammonia generated from Australian coal is
Ox is reduced, and the NOx concentration in the combustion exhaust gas decreases, indicating an important point.
第3図は、本発明の燃焼方式の一実施例のバーナである
。微粉炭供給孔1よシ、搬送空気で国内炭あるいは中国
炭を搬送し、微粉炭ノズル3より噴出燃焼させ主燃料と
する。ここでは、NOxの生成にかかわらず完全燃焼を
させる。次に、微粉炭供給孔2よ)、搬送空気でオース
トラリア炭を搬送し、微粉炭ノズル4より噴出燃焼させ
る。ここでは1.雰囲気酸素濃度が1%〜6%の搬送空
気を用いる。オーストクリア炭#i#E1図に示す如く
。FIG. 3 shows a burner of an embodiment of the combustion method of the present invention. Domestic coal or Chinese coal is conveyed through the pulverized coal supply hole 1 by conveying air, and is ejected from the pulverized coal nozzle 3 to be burned as the main fuel. Here, complete combustion is performed regardless of the generation of NOx. Next, the Australian coal is conveyed by conveying air through the pulverized coal supply hole 2), and is ejected and burned from the pulverized coal nozzle 4. Here 1. Transport air with an atmospheric oxygen concentration of 1% to 6% is used. Aust clear charcoal #i #E1 As shown in the figure.
国内炭や中国炭よりも石炭中窒素分のアンモニア転換率
が高い。従って、微粉炭ノズル3からの主燃料による生
成NOxを還元するNH島を多く含む火炎が、微粉炭ノ
ズル3からのNOxを多く含む火炎を包み込む形となっ
て、火炎先端部でNowの還元反応を起こし、低N0x
t−図る事が出来た。The ammonia conversion rate of nitrogen content in coal is higher than that of domestic coal or Chinese coal. Therefore, the flame containing many NH islands that reduce NOx produced by the main fuel from the pulverized coal nozzle 3 wraps around the flame containing many NOx from the pulverized coal nozzle 3, and the Now reduction reaction occurs at the flame tip. causes low N0x
I was able to figure out t-.
第4図は、本発明の燃焼方式の一実施例の燃焼炉である
。バーナ5よシ中国炭あるいは国内炭を燃焼させる。こ
こでは、NOxの生成にかかわらず完全燃焼をさせる。FIG. 4 shows a combustion furnace of one embodiment of the combustion method of the present invention. Burner 5 burns Chinese or domestic coal. Here, complete combustion is performed regardless of the generation of NOx.
従って、火炎7ではN Oxが多く生成する。一方、バ
ーナ6ではオース゛ト、ラリア炭を雰囲気酸素濃度1%
〜6%で燃焼させアンモニアを多く発生させる。従って
、火炎8はアンモニアを多く含む。このように、火炎7
と火炎゛ 8とが混シ合う領域が生じる様第4図の如く
バーナ6.7を配置する事によって、火炎7中に多く含
まれるN Oxを、火炎8中に多く含まれる団。Therefore, in the flame 7, a large amount of NOx is generated. On the other hand, in burner 6, the atmospheric oxygen concentration is 1%.
It burns at ~6% and generates a lot of ammonia. Therefore, the flame 8 contains a large amount of ammonia. In this way, flame 7
By arranging the burners 6 and 7 as shown in Fig. 4 so that a region where the flame 8 and the flame 8 are mixed together, the NOx contained in a large amount in the flame 7 is replaced by a group in which a large amount of NOx is contained in the flame 8.
を用いて還元し、低N Oxを図ることができる。can be used for reduction to achieve low NOx.
以上説明したように本発明によれば、Notの低減に有
効な還元剤であるアンモニアの発生量の多い炭種を選定
して還元剤として使用するので。As explained above, according to the present invention, a type of coal that generates a large amount of ammonia, which is an effective reducing agent for reducing Not, is selected and used as a reducing agent.
微粉炭燃焼ガスの低NotK効果が有る。Pulverized coal combustion gas has a low NotK effect.
第1図は1石炭中窒素分のアンモニアへの転換率を測定
した結果で、炭種による違いを示す図、第2図は、燃焼
炉の排ガス中のNotを測定し、主燃料として国内炭の
みを用いた場合と、それにオーストラリア炭を加えた場
合とを比較した図。
第3図は1本発明の一実施例のバーナの断面図。
第4図は1本発明の一実施例の燃焼炉の簡略構成図であ
る。
1.2・・・微粉炭供給孔、3.4・・・微粉炭ノズル
。
5.6・・・微粉炭燃焼バーナ、7.8・・・微粉炭燃
焼第1品
雰囲気 02(=/−)
第2図
零ml気縦を濃度 替り
第4図
第1頁の続き
0発 明 者 菱沼孝夫
日立市幸町3丁目1番1号株式
%式%
0出 願 人 バブコック日立株式会社東京都千代田区
大手町2丁目6
番2号Figure 1 shows the results of measuring the conversion rate of nitrogen to ammonia in one coal, showing the differences depending on the coal type. A diagram comparing the case of using only charcoal and the case of adding Australian charcoal. FIG. 3 is a sectional view of a burner according to an embodiment of the present invention. FIG. 4 is a simplified configuration diagram of a combustion furnace according to an embodiment of the present invention. 1.2...Pulverized coal supply hole, 3.4...Pulverized coal nozzle. 5.6...Pulverized coal combustion burner, 7.8...Pulverized coal combustion 1st product atmosphere 02 (=/-) Fig. 2 0 ml air vertically Concentration replacement Fig. 4 Continuation of page 1 0 shots Name: Takao Hishinuma, 3-1-1 Saiwaimachi, Hitachi-shi Stock% formula% 0 Applicant: Babcock-Hitachi Co., Ltd. 2-6-2 Otemachi, Chiyoda-ku, Tokyo
Claims (1)
を選定し、燃料として使用すると同時K。 他の燃焼から生じるNowの還元剤として使用すること
を特徴とする、石炭中窒素利用微粉炭燃焼方式。[Claims] L: Select coal that generates a large amount of ammonia during thermal decomposition of coal and use it as fuel. A pulverized coal combustion method using nitrogen in coal, which is characterized in that it is used as a reducing agent for Now generated from other combustion.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6868582A JPS58187709A (en) | 1982-04-26 | 1982-04-26 | Pulverized coal burning system utilizing nitrogen in coal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6868582A JPS58187709A (en) | 1982-04-26 | 1982-04-26 | Pulverized coal burning system utilizing nitrogen in coal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58187709A true JPS58187709A (en) | 1983-11-02 |
Family
ID=13380836
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6868582A Pending JPS58187709A (en) | 1982-04-26 | 1982-04-26 | Pulverized coal burning system utilizing nitrogen in coal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58187709A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6296216B1 (en) * | 2017-09-25 | 2018-03-20 | 中国電力株式会社 | Combustion apparatus and combustion method |
JP6332578B1 (en) * | 2017-09-08 | 2018-05-30 | 中国電力株式会社 | Combustion method |
-
1982
- 1982-04-26 JP JP6868582A patent/JPS58187709A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6332578B1 (en) * | 2017-09-08 | 2018-05-30 | 中国電力株式会社 | Combustion method |
WO2019049300A1 (en) * | 2017-09-08 | 2019-03-14 | 中国電力株式会社 | Combustion method |
JP6296216B1 (en) * | 2017-09-25 | 2018-03-20 | 中国電力株式会社 | Combustion apparatus and combustion method |
WO2019058563A1 (en) * | 2017-09-25 | 2019-03-28 | 中国電力株式会社 | Combustion apparatus and combustion method |
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