JPH0517445B2 - - Google Patents
Info
- Publication number
- JPH0517445B2 JPH0517445B2 JP18595082A JP18595082A JPH0517445B2 JP H0517445 B2 JPH0517445 B2 JP H0517445B2 JP 18595082 A JP18595082 A JP 18595082A JP 18595082 A JP18595082 A JP 18595082A JP H0517445 B2 JPH0517445 B2 JP H0517445B2
- Authority
- JP
- Japan
- Prior art keywords
- coal
- fuel ratio
- low
- nox
- 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
- 239000003245 coal Substances 0.000 claims description 61
- 239000000446 fuel Substances 0.000 claims description 48
- 239000002245 particle Substances 0.000 claims description 10
- 238000009841 combustion method Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 description 11
- 150000001875 compounds Chemical class 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Of Fluid Fuel (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は微粉炭の低NOx熱焼方法に係り、特
に高燃料比炭を低NOxで燃焼させるのに好適な
微粉炭燃焼方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a low NOx thermal combustion method for pulverized coal, and particularly to a pulverized coal combustion method suitable for burning high fuel ratio coal with low NOx.
石炭はその組成により種々のものがあり、特に
石炭中の固定炭素と揮発分の比によつて、固定炭
素分の高いものを高燃料比炭と呼んでいる。従来
のボイリでは高燃料比炭を燃焼する例がほとんど
なく、また、従来のボイラで高燃料比炭を燃焼さ
せた場合には、石炭中に含まれる揮発分が少ない
ため燃えにくく、したがつて未燃分の少ない高効
率での燃焼、あるいは低NOx燃焼を行なわせる
ことが困難であつた。
There are various types of coal depending on its composition, and in particular, coal with a high fixed carbon content is called high fuel ratio coal, depending on the ratio of fixed carbon to volatile content in the coal. In conventional boilers, there are almost no examples of burning high-fuel ratio coal, and when high-fuel ratio coal is burned in conventional boilers, it is difficult to burn because the volatile content in the coal is small, so it is difficult to burn. It has been difficult to achieve high efficiency combustion with little unburned matter or low NOx combustion.
また、従来、高燃料比炭と低燃料比炭の混炭に
よつて低未燃分、低NOx燃焼を試みられている
例があるが、低燃料比炭の混合割合に比例的に見
合つた分だけの未燃分、NOxの低下した期待で
きなかつた。 In addition, there have been attempts to achieve low unburned content and low NOx combustion by mixing high-fuel ratio coal and low-fuel ratio coal, but it has been attempted to achieve low unburned content and low NOx combustion by mixing high-fuel ratio coal and low-fuel ratio coal. Only the unburned fuel and NOx levels were lower than expected.
本発明の目的は燃料比の高い石炭を燃焼させる
際にNOxの生成を低くすることのできる微粉炭
燃焼方法を提供にするにある。
An object of the present invention is to provide a pulverized coal combustion method that can reduce the generation of NOx when burning coal with a high fuel ratio.
（発明の概要〕
燃焼時のNOx生成は、高燃料比炭では低燃料
比炭と比較してNOxの生成量が多い。ところが、
微粉炭の粒径を変化させて燃焼実験を行なうと、
NOxの生成量とそのときに得られる燃焼灰中の
未燃分の間には第１図に示すような関係が得ら
れ、同一の灰中未燃分のもとでは、NOxの生成
量は高燃料比炭では粒径が細かくなるほど低くな
り、低燃料比炭では粒径に関係しない。このこと
から、高燃料比炭と低燃料比炭の混合燃焼では、
高燃料比炭の粒径分布の差異がNOx生成量を支
配する。その理由は、低燃料比炭は粒径が高燃料
比炭より大きい場合でも揮発分が多いため、火路
内へ吹き込み後の熱分解過程で多量の揮発分を放
出し、揮発分の燃焼の際に局部的に空燃比が極め
て低くなり、還元性Ｎ化合物の放出が起こり易い
ためにNOxの生成が低くなる。一方、高燃料比
炭は揮発分が少ないために石炭中の窒素分が還元
性Ｎ化合物として放出され難く、NOxを生成が
高くなる傾向にあるが、粒径が細かいと、比表面
積が増すために還元性Ｎ化合物の放出が起こり易
くなり、NOxの生成が低くなる方向にある。し
かも、低燃料比炭の混在により、これから発生す
る多量の還元性Ｎ化合物の作用によつて、高燃料
比炭から発生したNOxをも低減することができ
る。(Summary of the invention) Regarding NOx generation during combustion, high fuel ratio coal generates more NOx than low fuel ratio coal.
When conducting combustion experiments by changing the particle size of pulverized coal,
The relationship shown in Figure 1 is obtained between the amount of NOx produced and the unburned content in the combustion ash obtained at that time, and for the same amount of unburned content in the ash, the amount of NOx produced is For high fuel ratio coals, the finer the particle size, the lower it becomes, and for low fuel ratio coals, it is not related to particle size. From this, in mixed combustion of high fuel ratio coal and low fuel ratio coal,
Differences in particle size distribution of high fuel ratio coals govern the amount of NOx produced. The reason for this is that even if the particle size of low-fuel ratio coal is larger than that of high-fuel ratio coal, it has a large amount of volatile matter, so it releases a large amount of volatile matter during the thermal decomposition process after being blown into the fire passage, and the combustion of volatile matter is suppressed. In this case, the air-fuel ratio locally becomes extremely low, and reducing N compounds are likely to be released, resulting in low NOx production. On the other hand, because high fuel ratio coal has less volatile matter, the nitrogen content in the coal is less likely to be released as reducing N compounds, and NOx production tends to increase. However, as the particle size becomes finer, the specific surface area increases This tends to make it easier for the release of reducing N compounds to occur, leading to lower NOx production. Furthermore, due to the coexistence of low fuel ratio coal, NOx generated from high fuel ratio coal can also be reduced by the action of a large amount of reducing N compounds generated from the coal.
以下、本発明は実施例を第２図により説明す
る。本発明は、ボイラ１、微粉炭バーナ２、高燃
料比炭用粉砕機３、低燃料比炭用粉砕機４および
粉砕機へ石炭を供給するための高熱料比炭用バン
カ５、低燃料比炭用バンカ６、高燃料比炭用供給
器７、低燃料比炭用供給器８およびそれぞれの粉
砕機からバーナへの微粉炭供給ライン９より構成
される。
Hereinafter, an embodiment of the present invention will be explained with reference to FIG. The present invention comprises a boiler 1, a pulverized coal burner 2, a pulverizer 3 for high fuel ratio coal, a pulverizer 4 for low fuel ratio coal, a bunker 5 for high heating ratio coal for supplying coal to the pulverizer, and a bunker 5 for low fuel ratio coal. It is composed of a coal bunker 6, a high fuel ratio coal feeder 7, a low fuel ratio coal feeder 8, and a pulverized coal supply line 9 from each crusher to the burner.
粉砕機によつて粉砕された微粉炭は、フアン１
１によつて微粉機へ供給される搬送用空気１０に
より微粉炭供給ライン９を経て微粉炭バーナ２へ
供給され、ボイラ１の火炉内で燃焼する。この場
合、石炭はその燃料比が高いほど一般に粉砕され
易い性質があり、したがつて燃料比の高い石炭ほ
ど粉砕機での所要動力が小さくて済む。ボイラの
運転中に燃料として入つて来る石炭の炭種が変わ
つて燃料比が変化した場合、高燃料比炭用粉砕機
の電動機１２の動力が変化するが、その場合でも
この動力を一定に保つように分級機１４の粒度調
節器を操作する。つまり、燃料比の高い石炭が入
つて電動機１２の動力が低下した場合には分級器
１４を粒径が細かくなるように調節する。その結
果として、燃料比の高い石炭ほど粒径が細かくな
り、低NOx化が実現できる。 The pulverized coal crushed by the crusher is
The conveying air 10 supplied to the pulverizer by the pulverizer 1 is supplied to the pulverized coal burner 2 via the pulverized coal supply line 9, and is burned in the furnace of the boiler 1. In this case, the higher the fuel ratio of coal, the easier it is to be pulverized, and therefore, the higher the fuel ratio of coal, the smaller the power required by the pulverizer. If the type of coal that comes in as fuel changes during operation of the boiler and the fuel ratio changes, the power of the electric motor 12 of the high fuel ratio coal pulverizer changes, but even in that case, this power is kept constant. Operate the particle size controller of the classifier 14 as follows. That is, when coal with a high fuel ratio is introduced and the power of the electric motor 12 is reduced, the classifier 14 is adjusted so that the particle size becomes fine. As a result, the higher the fuel ratio of coal, the finer the particle size, making it possible to achieve lower NOx.
本発明によれば高熱料比炭からの還元性Ｎ化合
物の生成を燃焼初期の熱分解時にできるだけ早く
させることができ、また、低燃料比炭から生ずる
多量の還元性Ｎ化合物をNOxの還元に利用する
ことができるので高燃料比炭の燃料時に多量に発
生するNOxを還元でき、その発生を低減するこ
とができる。
According to the present invention, it is possible to generate reducing N compounds from high heating ratio coal as quickly as possible during thermal decomposition at the initial stage of combustion, and also to use a large amount of reducing N compounds generated from low fuel ratio coal to reduce NOx. Since it can be used as fuel, it is possible to reduce NOx, which is generated in large quantities when using high fuel ratio coal as fuel, and to reduce its generation.
第１図は微粉炭燃焼時のNOxの生成量を灰中
未燃分との関係を示した図、第２図は本発明の実
施例の系統図である。
１……ボイラ、２……バーナ、３，４……粉砕
機、５……高燃料比炭バンカ、６……低燃料比炭
バンカ、７……高燃料比炭供給器、８……低燃料
比炭供給器、９……微粉炭供給、１０……搬送用
空気、１１……フアン、１２……粉砕機用電動
機。
FIG. 1 is a diagram showing the relationship between the amount of NOx produced during pulverized coal combustion and the unburned content in the ash, and FIG. 2 is a system diagram of an embodiment of the present invention. 1...Boiler, 2...Burner, 3, 4...Crusher, 5...High fuel ratio coal bunker, 6...Low fuel ratio coal bunker, 7...High fuel ratio coal feeder, 8...Low Fuel specific coal feeder, 9...pulverized coal supply, 10...conveying air, 11...fan, 12... electric motor for the crusher.
Claims (1)
少ない低燃料比炭を混焼する燃焼方法において、
前記高燃料比炭の粒径を前記低燃料比炭の粒径よ
りも細かくして燃焼させることを特徴とする低
NOx燃焼方法。1. In a combustion method that co-fires high fuel ratio coal with a high fixed carbon content and low fuel ratio coal with a low fixed carbon content,
The low fuel ratio coal is combusted by making the particle size of the high fuel ratio coal smaller than that of the low fuel ratio coal.
NOx combustion method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18595082A JPS5977207A (en) | 1982-10-25 | 1982-10-25 | Low nox burner device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18595082A JPS5977207A (en) | 1982-10-25 | 1982-10-25 | Low nox burner device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5977207A JPS5977207A (en) | 1984-05-02 |
| JPH0517445B2 true JPH0517445B2 (en) | 1993-03-09 |
Family
ID=16179711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18595082A Granted JPS5977207A (en) | 1982-10-25 | 1982-10-25 | Low nox burner device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5977207A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5083797B2 (en) * | 2006-08-31 | 2012-11-28 | 一般財団法人電力中央研究所 | Coal combustion apparatus and coal combustion method |
| JP5442564B2 (en) * | 2010-09-06 | 2014-03-12 | 株式会社神戸製鋼所 | Pulverized coal combustion method and pulverized coal combustion apparatus |
-
1982
- 1982-10-25 JP JP18595082A patent/JPS5977207A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5977207A (en) | 1984-05-02 |
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