JPS60205A - Pulverized coal dual supply burner - Google Patents
Pulverized coal dual supply burnerInfo
- Publication number
- JPS60205A JPS60205A JP10750683A JP10750683A JPS60205A JP S60205 A JPS60205 A JP S60205A JP 10750683 A JP10750683 A JP 10750683A JP 10750683 A JP10750683 A JP 10750683A JP S60205 A JPS60205 A JP S60205A
- Authority
- JP
- Japan
- Prior art keywords
- pulverized coal
- coal
- grains
- coarse
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
Description
【発明の詳細な説明】
、〔発明の利用分野〕
本発明は燃焼製筒に係り、特に揮発分の少ない微粉炭を
効率よく燃焼させるのに好適な燃焼炉の燃料供給バーナ
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a combustion cylinder, and particularly to a fuel supply burner for a combustion furnace suitable for efficiently burning pulverized coal with a low volatile content.
従来技術による燃焼炉では、燃料中の揮発分が比較的多
い石炭即ち石炭中に含まれる固定分が少ない低燃料比炭
を対象として作られている。しかし、承知のごとく化石
燃料の枯渇に対する関心より、最近では燃焼しにくい高
燃料比炭の利用のニーズが高くなっている。つまり、揮
発分の少ない微粉炭は燃焼しにくいという欠点がある一
方で高い燃料力０１Ｊ−を有するものであり、この揮発
分の少ない高燃料比炭から成る微粉炭を効率よく燃焼さ
せることが必要となってきているものである。Combustion furnaces according to the prior art are designed to use coal with a relatively high volatile content in the fuel, that is, low fuel ratio coal with a low fixed content. However, as is well known, concerns about the depletion of fossil fuels have recently led to a growing need for the use of coal with a high fuel ratio that is difficult to burn. In other words, pulverized coal with a low volatile content has the disadvantage of being difficult to burn, but has a high fuel power, and it is necessary to efficiently burn pulverized coal made of high fuel ratio coal with a low volatile content. This is something that is becoming more and more common.
ところが、従来の燃焼技術を、揮発分の少ない微粉炭の
燃焼にそのまま応用したのでは以下のような問題点が生
ずるものであった。However, if conventional combustion techniques were directly applied to the combustion of pulverized coal with a low volatile content, the following problems would arise.
■ 即ち、揮発分の少ない微粉炭は燃焼中の火炎の保持
が不安定でちゃ、そのため燃焼効率が低下し灰の中の未
燃燐分が多く、エネルギーの浪゛費につながるというこ
と、■燃焼効率が悪いため、燃焼炉内での全体の燃焼温
度が低下し熱吸収率が低下することにより、完全燃焼を
行わせる必要上燃焼炉を太きくしなければならないとい
うこと、■微粉炭中には粒子の小さな微粒炭と大きな粗
粉炭が混存しているだめに、燃焼中に発生するＮＯｘを
還元する燃焼中の中間生成物の発生が少なく、結果的に
燃焼排気ガス中のＮＯｘの濃度が高くなってしまうとい
うことという問題点があった。尚、■上記■の問題点を
改善すべく、微粒炭及び粗粉炭を供給する供給口をバー
ナの上側と下側に分級する技術（％開昭５５−６６５５
１号、特願昭５５−１０６７９９号）が存在するが、こ
の技術では未だ微粉炭の燃焼率が完全ではなくより一層
の解決が望まれていた。■ In other words, pulverized coal with a low volatile content has unstable flame retention during combustion, which reduces combustion efficiency and leaves a large amount of unburned phosphorus in the ash, leading to wasted energy. Due to poor combustion efficiency, the overall combustion temperature in the combustion furnace decreases and the heat absorption rate decreases, which means that the combustion furnace must be made thicker to achieve complete combustion. Since fine coal with small particles and coarse coal with large particles coexist, there is less generation of intermediate products during combustion that reduce NOx generated during combustion, and as a result, the concentration of NOx in combustion exhaust gas decreases. There was a problem that the cost would be high. In addition, in order to improve the problem of ■ above (■), there is a technology to separate the supply ports for supplying fine coal and coarse coal into the upper and lower sides of the burner (%Kasho 55-6655
No. 1, Japanese Patent Application No. 55-106799), but this technology still did not achieve a perfect combustion rate of pulverized coal, and a further improvement was desired.
未発明は、前記従来技術の問題点に鑑みてなされたもの
であり、微粒炭と粗粉炭が混存する微粉炭の燃焼にあっ
ても、■火炎の保持が安定していて■燃焼炉内の燃焼温
度を高温に維持でき■燃焼排気ガス中のＮＯｘ濃度を低
く押えることができる微粉炭用のバーナを提供すること
を目的とする。The invention was made in view of the problems of the prior art described above, and even in the combustion of pulverized coal in which granulated coal and coarse pulverized coal coexist, flame retention is stable and An object of the present invention is to provide a burner for pulverized coal that can maintain combustion temperature at a high temperature and keep the NOx concentration in combustion exhaust gas low.
本発明の微粉炭二重供給型／く−ナは、微粉炭供給口を
内側と外側の二重に分割し、これらの分割された供給口
において、微粉炭中の微粒炭と粗粉炭とを分級して供給
することにより、微粒炭の燃焼を優先させて火炎の安定
化を図るとともに燃焼温度を高温に維持し、更に燃焼排
気ガス中のＮＯｘの濃度を低く押えることができるもの
である。The pulverized coal double supply type/burner of the present invention has a pulverized coal supply port divided into two parts, an inner and an outer part, and the pulverized coal and coarse coal in the pulverized coal are separated at these divided supply ports. By classifying and supplying the coal, it is possible to give priority to the combustion of the granulated coal, stabilize the flame, maintain the combustion temperature at a high temperature, and further suppress the concentration of NOx in the combustion exhaust gas.
以下、本発明の一実施例について図面を用いて詳細に説
明する。燃焼炉構造物の炉壁ｌには開口部１２が設けら
れている。この開口部２に対し微粉炭供給管３の供給口
が開口している。この微粉炭供給管３は風箱壁４から伸
びるものである。微粉炭供給管３の風箱壁４側には絞り
部５が設けられており、供給口側には内管６が設けられ
二重管の状態になっている。内管６の肉厚は内管６の奥
に行くに従って大きくなり、内部が狭いものとなってい
る。この二重管において、内管６と微粉炭供給管３の間
で形成される環状部分７には旋回羽根８が設けられてい
る。微粉炭供給管３の外周には燃料用空気を供給するだ
めの供給口９、ｌＯが設けられている。この供給口は二
重になっており内側の燃焼用空気第一供給口９と外側の
燃焼用空気第二供給口１０とが存在する。これらの供給
口９．１０は夫々空気レジスター１１，１２につながっ
ている。微粒炭と粗粉炭を含んだ微粉炭は、微粉炭供給
用空気によシ微粉炭供給管３に流入し、絞り部５によっ
て加速され微粒炭と粗粉炭が均一状態に攪拌されたのち
、減速され二重管の部分に流入する。二重管における内
管６の通路の内断面積は奥に向って狭くなっているため
、一種の流動抵抗となシ、この内管６にさしかかった微
粉炭のうち粗粒炭は、慣性力が大きいため内管６の内部
へ流入することができる。しかし、慣性力の小さい微粒
炭は、内管６の内部に流入することができず環状部分７
を流れることになる。つ′！シ、この二重管の構造によ
り二重管にさしかかった微粉炭は、粗粉炭は内管の内部
へ、微粒炭は環状部分７へと分級することができる。内
管６を通過しだ粗粉炭はそのまま燃焼炉内へ供給される
。一方、環状部分７へと分級された微粒炭は管状部分７
に設けられたす四羽根８によって旋回させられる。その
結果として微粉炭と微粉炭供給用空気及び燃焼用空気と
の相対速度が大きくなり、燃焼効果を著るしく改善する
ことができる。つまり、バーナ近傍の一次火炎の燃焼速
度が大きくなるので安定した火炎を形成することができ
る。燃焼用空気は、微粉炭供給管３の周囲において、燃
焼炉内へ供給される。燃焼用空気第一供給管９及び燃焼
用空気第二供給管１０よシ供給される燃焼空気は、各々
レジス久−１１，１２によって適度の旋回流となり燃焼
炉内の燃焼効率を高めるものである。Hereinafter, one embodiment of the present invention will be described in detail using the drawings. An opening 12 is provided in the furnace wall l of the combustion furnace structure. A supply port of a pulverized coal supply pipe 3 opens to this opening 2 . This pulverized coal supply pipe 3 extends from the wind box wall 4. A throttle part 5 is provided on the wind box wall 4 side of the pulverized coal supply pipe 3, and an inner pipe 6 is provided on the supply port side, forming a double pipe. The wall thickness of the inner tube 6 increases as it goes deeper into the inner tube 6, making the inside narrower. In this double pipe, a swirling vane 8 is provided in an annular portion 7 formed between the inner pipe 6 and the pulverized coal supply pipe 3. A supply port 9, 10 for supplying fuel air is provided on the outer periphery of the pulverized coal supply pipe 3. This supply port is double-layered, with a first combustion air supply port 9 on the inside and a second combustion air supply port 10 on the outside. These inlets 9, 10 lead to air registers 11, 12, respectively. The pulverized coal containing granulated coal and coarse pulverized coal flows into the pulverized coal supply pipe 3 through the pulverized coal supply air, is accelerated by the throttle part 5, the granulated coal and coarse pulverized coal are uniformly stirred, and then decelerated. and flows into the double pipe section. Since the internal cross-sectional area of the passage in the inner tube 6 in a double-walled tube becomes narrower toward the back, there is a kind of flow resistance. Since it is large, it can flow into the interior of the inner tube 6. However, the granulated coal having a small inertial force cannot flow into the inner tube 6 and the annular portion 7
will flow. Tsu'! By virtue of this double tube structure, the pulverized coal that approaches the double tube can be classified into coarse pulverized coal into the inner tube and fine granulated coal into the annular portion 7. The coarse pulverized coal that has passed through the inner tube 6 is fed into the combustion furnace as it is. On the other hand, the granulated coal classified into the annular portion 7 is divided into the tubular portion 7.
It is rotated by four blades 8 provided on the. As a result, the relative velocity between the pulverized coal and the pulverized coal supply air and combustion air increases, and the combustion effect can be significantly improved. In other words, since the combustion speed of the primary flame near the burner increases, a stable flame can be formed. Combustion air is supplied into the combustion furnace around the pulverized coal supply pipe 3. Combustion air supplied through the first combustion air supply pipe 9 and the second combustion air supply pipe 10 is turned into a moderate swirling flow by the Regis-Ku-11 and 12, respectively, to increase the combustion efficiency in the combustion furnace. .
本実施例によれば、燃焼しやすい微粒炭はいちはやく燃
焼をはじめ、燃焼しにくい粗粉炭は高温で燃焼している
微粒炭の火炎に包まれるため、速やかに燃焼を始め、安
定した火炎を形成する。このため微粉炭の燃焼効率は上
昇し、燃焼排気ガス中のＮＯｘの濃度も低くなるもので
ある。又従来技術（特開昭５５−１３５５１号、特願昭
５５−１０６７９９号）に比べ、粗粉炭が微粉炭に対し
単に上下の位置関係にあるものではなく、粗粉炭が高温
で燃焼する微粉炭の内部につつみこまれるため、より燃
焼効率が上昇するものである。According to this example, granular coal that is easy to burn starts burning quickly, and coarse coal that is difficult to burn is enveloped in the flame of the granular coal burning at high temperature, so it starts burning quickly and forms a stable flame. do. Therefore, the combustion efficiency of pulverized coal increases and the concentration of NOx in the combustion exhaust gas decreases. Also, compared to the conventional technology (Japanese Patent Application Laid-Open No. 55-13551, Japanese Patent Application No. 55-106799), the coarse coal is not simply positioned above and below the pulverized coal, but the pulverized coal burns at a high temperature. Since the fuel is contained inside the fuel, the combustion efficiency is further increased.
尚、本実施例に用いられる旋回羽根８は第５図に示すよ
うに単に傾斜した複数枚の羽根によって構成される場合
に限らず、第６図に示すように各羽根が略乙型の断面を
有し各々の羽根の間に乙型に曲げられた流路を形成し、
これによって小さくて強い渦流１３を無数に発生させ火
炎をより安定させることもできる。Note that the swirling blade 8 used in this embodiment is not limited to the case where it is simply composed of a plurality of inclined blades as shown in FIG. It has a flow path bent in an O-shape between each blade,
This also makes it possible to generate countless small and strong vortices 13 to further stabilize the flame.
本実施例においては二重に分割された微粉炭供給管の外
側の環状の供給口に螺旋羽根を設けだが、この螺旋羽根
は必ずしも必要とするものではないっ又、本実施例にお
いては、微粉炭を微粉炭と粗粉炭とに分級する機能は、
微粉炭供給管に設けられた二重管がはだすものであるが
、必ずしも二重管によって分級するのみに限らず、微粉
炭供給用の空気が通る流路において、部分的に一種の流
動抵抗を設は慣性力の大ぎい粗粉炭のみが通過できる流
路を部分的に構成するものであれば、他の構造にするこ
とも可能である。In this embodiment, a spiral blade is provided at the outer annular supply port of the double-divided pulverized coal supply pipe, but this spiral blade is not necessarily required. The function of classifying coal into pulverized coal and coarse pulverized coal is
The double pipe installed in the pulverized coal supply pipe protrudes, but the classification is not necessarily limited to the double pipe, and a type of flow resistance is partially created in the flow path through which the air for pulverized coal supply passes. It is also possible to use other structures as long as the structure partially constitutes a flow path through which only coarse pulverized coal having a large inertial force can pass.
又、本実施例は二重管構造とすることによりバーナ自体
に分級機能を具備させたものであるが、本発明はこれに
限らず、他の手段によりはじめから微粉炭を微粉炭と粗
粉炭とに分級しておき、これを内側と外側とに二重に分
割した微粉炭供給口から供給し、本実施例と同様の効果
を得ることができる。Further, in this embodiment, the burner itself is equipped with a classification function by having a double tube structure, but the present invention is not limited to this, and the present invention is not limited to this. The same effects as in this embodiment can be obtained by classifying the pulverized coal into pulverized coal and supplying the pulverized coal from a doubly divided pulverized coal supply port into inner and outer parts.
本発明の微粉炭二重供給型バーナによれば、微粉炭と粗
粉炭とが混存する微粉炭の燃焼において、火炎が安定し
燃焼温度の低下を防止することができるため、燃焼効率
が上昇し、燃焼炉のコンパクト化発生するＮＯｘ濃度を
低くすることができる。According to the pulverized coal double-feed burner of the present invention, when pulverized coal in which pulverized coal and coarse pulverized coal coexist is combusted, the flame is stabilized and the combustion temperature can be prevented from decreasing, so that the combustion efficiency is increased. By making the combustion furnace more compact, the NOx concentration generated can be lowered.
第１図は本発明の微粉炭二重供給型バーナの一実施例に
おける縦断面図、第２図は第１図の正面図、第３図は第
１図のＡ部拡大図、第４図は第３図の正面図、第５図は
第４図のＣ−Ｃ断面図、第６図は第５図の変形例を示す
図である。
】・・・炉壁、 ２・・・開口部、
３・・・微粉炭供給管、４・・・風箱壁、５・・・絞り
部、 ６・・・内管、
７・・・環状部分、 ８・・・旋回羽根、９・・・燃焼
用空気第一供給管、
１０・・・燃焼用空気第二供給管、
１１．１２・・・空気レジスター、
１３・・・渦流。
代理人 鵜 沼 辰 之
２５Fig. 1 is a vertical cross-sectional view of one embodiment of the pulverized coal dual-feed burner of the present invention, Fig. 2 is a front view of Fig. 1, Fig. 3 is an enlarged view of section A in Fig. 1, and Fig. 4. 3 is a front view of FIG. 3, FIG. 5 is a sectional view taken along the line C--C of FIG. 4, and FIG. 6 is a diagram showing a modification of FIG. 5. ]... Furnace wall, 2... Opening, 3... Pulverized coal supply pipe, 4... Wind box wall, 5... Squeezed part, 6... Inner pipe, 7... Annular Parts 8... Swirl vane, 9... First combustion air supply pipe, 10... Second combustion air supply pipe, 11.12... Air register, 13... Eddy flow. Agent Tatsu Unuma 25
Claims (1)
の微粉炭供給用空気とは別に燃焼用空気を供給するバー
ナにおいて、 微粉炭供給口を内側と外側に二重に分割し、微粉炭中の
微粒炭と粗粉炭を分級して供給することを特徴とする微
粉炭二重供給型バーナ。 （２、特許請求の範囲第１項において、バーナ自体に微
粒炭と粗粉炭を分級する機能を具備させた微粉炭二重供
給型バーナ。 （３１特許請求の範囲第１項において、外側の供給口に
旋回羽根を設けて、粗粉炭をこの外側の供給口から旋回
させて供給する微粉炭二重供給型バーナ。[Claims] +1.1 In a burner that supplies υ pulverized coal by pulverized coal supply air and supplies combustion air separately from this pulverized coal supply air, pulverized coal supply ports are provided on the inside and outside. A pulverized coal dual-feeding burner characterized by dividing the pulverized coal into two parts and classifying and feeding pulverized coal into granulated coal and coarse pulverized coal. (2. In claim 1, a pulverized coal dual-feeding burner in which the burner itself has a function of classifying granulated coal and coarse pulverized coal. (31) In claim 1, A pulverized coal dual feed burner that has a swirl vane at its mouth and supplies coarse pulverized coal by swirling it from the outer supply port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10750683A JPS60205A (en) | 1983-06-15 | 1983-06-15 | Pulverized coal dual supply burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10750683A JPS60205A (en) | 1983-06-15 | 1983-06-15 | Pulverized coal dual supply burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60205A true JPS60205A (en) | 1985-01-05 |
| JPH0423163B2 JPH0423163B2 (en) | 1992-04-21 |
Family
ID=14460930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10750683A Granted JPS60205A (en) | 1983-06-15 | 1983-06-15 | Pulverized coal dual supply burner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60205A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0672863A2 (en) * | 1994-03-18 | 1995-09-20 | Hitachi, Ltd. | Pulverized coal combustion burner |
| US6053118A (en) * | 1994-06-17 | 2000-04-25 | Mitsubishi Jukogyo Kabushiki Kaisha | Pulverized fuel rich/lean separator for a pulverized fuel burner |
| US20130098278A1 (en) * | 2010-04-27 | 2013-04-25 | Yantai Longyuan Power Technology Co., Ltd | Pulverized coal burner and pulverized coal boiler having it |
| CN110319437A (en) * | 2019-07-09 | 2019-10-11 | 哈尔滨工业大学 | A kind of oxygen-enriched multiple flame vortex coal burner |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5495025A (en) * | 1978-01-13 | 1979-07-27 | Babcock Hitachi Kk | Vent air treating system containing particle coal |
| JPS54159741A (en) * | 1978-06-07 | 1979-12-17 | Mitsubishi Heavy Ind Ltd | Powdery fuel burner |
-
1983
- 1983-06-15 JP JP10750683A patent/JPS60205A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5495025A (en) * | 1978-01-13 | 1979-07-27 | Babcock Hitachi Kk | Vent air treating system containing particle coal |
| JPS54159741A (en) * | 1978-06-07 | 1979-12-17 | Mitsubishi Heavy Ind Ltd | Powdery fuel burner |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0672863A2 (en) * | 1994-03-18 | 1995-09-20 | Hitachi, Ltd. | Pulverized coal combustion burner |
| EP0672863A3 (en) * | 1994-03-18 | 1996-05-29 | Hitachi Ltd | Pulverized coal combustion burner. |
| US6053118A (en) * | 1994-06-17 | 2000-04-25 | Mitsubishi Jukogyo Kabushiki Kaisha | Pulverized fuel rich/lean separator for a pulverized fuel burner |
| US20130098278A1 (en) * | 2010-04-27 | 2013-04-25 | Yantai Longyuan Power Technology Co., Ltd | Pulverized coal burner and pulverized coal boiler having it |
| US8950345B2 (en) * | 2010-04-27 | 2015-02-10 | Yantai Longyuan Power Technology Co., Ltd. | Pulverized coal burner and pulverized coal boiler having it |
| CN110319437A (en) * | 2019-07-09 | 2019-10-11 | 哈尔滨工业大学 | A kind of oxygen-enriched multiple flame vortex coal burner |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0423163B2 (en) | 1992-04-21 |
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