JPH0324969Y2 - - Google Patents
Info
- Publication number
- JPH0324969Y2 JPH0324969Y2 JP11595985U JP11595985U JPH0324969Y2 JP H0324969 Y2 JPH0324969 Y2 JP H0324969Y2 JP 11595985 U JP11595985 U JP 11595985U JP 11595985 U JP11595985 U JP 11595985U JP H0324969 Y2 JPH0324969 Y2 JP H0324969Y2
- Authority
- JP
- Japan
- Prior art keywords
- pulverized
- fluid
- concentrated
- fuel
- fine powder
- 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
Links
- 239000000446 fuel Substances 0.000 claims description 42
- 239000012530 fluid Substances 0.000 claims description 37
- 239000000843 powder Substances 0.000 claims description 29
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 description 8
- 238000005192 partition Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Description
【考案の詳細な説明】
産業上の利用分野
本考案は、石炭、木炭、コークス、ゴム、プラ
スチツク等を微粉砕したものを燃料として使用す
るボイラや化学工業炉等に利用される微粉燃料バ
ーナに関する。[Detailed description of the invention] Industrial application field The invention relates to a pulverized fuel burner used in boilers, chemical industrial furnaces, etc. that use pulverized coal, charcoal, coke, rubber, plastic, etc. as fuel. .
従来の技術
第７図ないし第１０図は、特開昭56−149517号
公報に記載されている従来の微粉燃料バーナを示
したものである。これらの図において、１は微粉
燃料と空気との混合流体が搬送される混合流通路
であり、この通路１は分配器２に連結されてい
る。分配器２は、混合流通路１から導入される混
合流体を遠心力によつて、微粉燃料濃度の高い濃
微粉流体３と、微粉燃料濃度の低い淡微粉流体４
とに分離するためのものである。そのため、分配
器２には、濃微粉流搬送管５と淡微粉流搬送管６
とが曲管を介して略直角に連結されており、淡微
粉流搬送管６が分配器２中を搬送されて来る混合
流体の主流に対し鋭角に取付けられている。従つ
て、混合流体の遠心力によつて、管５に流れるも
のは微粉燃料の濃度が高くなり、逆に管６に流れ
るものの微粉燃料濃度は低くなる。BACKGROUND ART FIGS. 7 to 10 show a conventional pulverized fuel burner described in Japanese Unexamined Patent Publication No. 149517/1983. In these figures, reference numeral 1 denotes a mixed flow passage through which a mixed fluid of pulverized fuel and air is conveyed, and this passage 1 is connected to a distributor 2 . The distributor 2 divides the mixed fluid introduced from the mixed flow path 1 into a concentrated pulverized fluid 3 with a high pulverized fuel concentration and a light pulverized fluid 4 with a low pulverized fuel concentration by centrifugal force.
It is used to separate the Therefore, the distributor 2 includes a concentrated fine powder flow conveying pipe 5 and a light fine powder flow conveying pipe 6.
are connected at a substantially right angle via a curved pipe, and the light fine powder flow conveying pipe 6 is attached at an acute angle to the mainstream of the mixed fluid conveyed through the distributor 2. Therefore, due to the centrifugal force of the mixed fluid, the concentration of pulverized fuel in the fluid flowing into the pipe 5 becomes high, and conversely, the concentration of pulverized fuel in the fluid flowing into the pipe 6 becomes low.
なお、各管５，６はそれぞれ一対の微粉燃料噴
射ノズル７の中央部に開口しており、各開口のま
わりには空気噴出孔９が設けられている。また、
濃微粉流体３及び淡微粉流体４の噴出する開口部
をはさんで、補助空気ノズル１０が設けられてい
る。 Note that each of the pipes 5 and 6 opens at the center of a pair of pulverized fuel injection nozzles 7, and air jet holes 9 are provided around each opening. Also,
An auxiliary air nozzle 10 is provided across the openings from which the dense powder fluid 3 and the light powder fluid 4 are ejected.
考案が解決しようとする問題点
上記のような微粉燃料バーナは、一般的に使用
される微粉燃料を燃焼させる場合には、極めて安
定な燃焼を維持することができるとともに、低
NOx化が図れるため、好評を得ている。Problems to be solved by the invention The pulverized fuel burner as described above can maintain extremely stable combustion and reduce
It has been well received because it can reduce NOx.
しかしながら、近時、資源の有効活用等の見地
から、低品位微粉燃料と呼ばれる灰分の多い石炭
や着火性に劣る各種燃料を使用することへの要請
がたかまり、これら低品位微粉燃料に対しては、
従来の微粉燃料バーナでは着火性や保炎性に劣
り、安定な燃焼を維持することが困難であるとの
問題があつた。 However, in recent years, from the standpoint of effective resource utilization, there has been an increasing demand for the use of coal with a high ash content, known as low-grade pulverized fuel, and various fuels with poor ignitability. teeth,
Conventional pulverized fuel burners suffer from poor ignitability and flame stability, making it difficult to maintain stable combustion.
問題点を解決するための手段
本考案では、上記の問題点を解決するために、
微粉燃料と空気との混合状態が異なる濃微粉流体
及び淡微粉流体を夫々搬送する濃微粉流通路及び
淡微粉流通路がそれぞれ中央部に開口する一対の
微粉燃料噴射ノズルを備えている微粉燃料バーナ
において、前記濃微粉流通路に前記濃微粉流体の
濃度状態が異なるように高濃微粉流と低濃微粉流
とに分離する分配器を介装している。Means for solving the problems In this invention, in order to solve the above problems,
A pulverized fuel burner equipped with a pair of pulverized fuel injection nozzles each having a dense pulverized flow passage and a light pulverized flow passage each opening in the center for conveying a rich pulverized fluid and a light pulverized fluid having different mixing states of pulverized fuel and air, respectively. In this method, a distributor is installed in the concentrated fine powder flow path to separate the concentrated fine powder fluid into a high concentration fine powder flow and a low concentration fine powder flow so that the concentration states of the concentrated fine powder fluid are different.
作 用
上記の手段により、濃微粉流体を更に高濃度の
ものと低濃度のものに分離して燃焼させるので、
火炎伝播特性上、高濃度の高濃微粉流を低品位微
粉燃料の安定着火領域に位置させることができ、
安定な着火と燃焼を維持することができる。Effect: By the above means, the concentrated pulverized fluid is further separated into high concentration and low concentration and combusted.
Due to flame propagation characteristics, a highly concentrated fine powder flow can be located in the stable ignition region of low-grade fine powder fuel,
Stable ignition and combustion can be maintained.
実施例
以下本考案の一実施例について第１図ないし第
６図を参照して詳細に説明する。なお、これらの
図において、第７図ないし第１０図と同一部分に
は同一符号を附して示してあるので、その部分の
説明は省略する。Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6. In these figures, the same parts as in Figs. 7 to 10 are denoted by the same reference numerals, so the explanation of those parts will be omitted.
第１図は本考案に係る微粉燃料バーナの一実施
例を示す断面図であり、濃微粉流搬送管５部分の
構造に特徴がある。従つて、その特徴部分を良く
表わすように、第１図の−線方向矢視図を第
２図に、−線に沿う断面図を第３図に、第３
図の−線に沿う断面図を第４図に、−線
に沿う断面図を第５図に夫々示してある。 FIG. 1 is a sectional view showing an embodiment of the pulverized fuel burner according to the present invention, which is characterized by the structure of the concentrated pulverized powder flow conveying pipe 5 portion. Therefore, in order to better represent the characteristic parts, FIG. 2 is a view taken in the direction of the - line in FIG.
A sectional view taken along the - line in the figure is shown in FIG. 4, and a sectional view taken along the - line in FIG. 5, respectively.
さて、これらの図に示されているように、濃微
粉流搬送管５の内部に、軸方向に沿つて管内を二
分するように仕切板２０が設けられている。この
仕切板２０の一端は、分配器２と濃微粉流搬送管
５との接続部に位置し、分配器２から流れ込む濃
微粉流体３の流れに対して略直角な面をなしてい
る。そして、仕切板２０の他端はノズル７の先端
部近傍に達しているが、その先端部分には三角形
状のブロツク２３が設けられている。このブロツ
ク２３は三角形の頂点側が仕切板２０に接近し、
底辺側が炉内側を向くように配設されている。 Now, as shown in these figures, a partition plate 20 is provided inside the concentrated fine powder flow conveying pipe 5 so as to divide the inside of the pipe into two along the axial direction. One end of the partition plate 20 is located at the connection between the distributor 2 and the concentrated fine powder flow conveying pipe 5, and forms a surface substantially perpendicular to the flow of the concentrated fine powder fluid 3 flowing from the distributor 2. The other end of the partition plate 20 reaches near the tip of the nozzle 7, and a triangular block 23 is provided at the tip. In this block 23, the apex side of the triangle approaches the partition plate 20,
It is arranged so that the bottom side faces the inside of the furnace.
次に、作用を説明する。分配器２と濃微粉流搬
送管５とは、従来と同様に曲管を介して略直角に
接合されている。そのため、搬送管５の入口部で
は、供給される濃微粉流体３に濃度分布を生じ、
この入口部に仕切板２０が設けられているため、
第１図における仕切板２０より上の搬送管５内に
は微粉燃料の濃度の高い高濃微粉流体２１が導入
され、仕切板２０より下の搬送管５内には濃度の
低い低濃微粉流体２２が導入されることになる。 Next, the effect will be explained. The distributor 2 and the concentrated fine powder flow conveying pipe 5 are connected at a substantially right angle via a curved pipe as in the conventional case. Therefore, at the entrance of the conveying pipe 5, a concentration distribution occurs in the supplied concentrated fine powder fluid 3,
Since the partition plate 20 is provided at this entrance,
In FIG. 1, a highly concentrated pulverized fluid 21 with a high concentration of pulverized fuel is introduced into the conveying pipe 5 above the partition plate 20, and a low concentration pulverized fluid with a low concentration is introduced into the conveying pipe 5 below the partition plate 20. 22 will be introduced.
第６図は微粉流体中の空気と微粉燃料との重量
比と火炎伝播速度の関係を示したもので、図中２
５は一般的な微粉燃料の火炎伝播曲線（以下曲線
Ｘと略す）、２６は低品位微粉燃料の火炎伝播曲
線（以下曲線Ｙと略す）、２７は一般的な微粉燃
料の特に着火が安定な限界線（以下線Ｘと略す）、
２８は低品位微粉燃料の特に着火が安定な限界線
（以下線Ｙと略す）、２９は混合気体Ａ３の空気と
燃料の重量比位置（以下ａ点と略す）、３０は混
合気体Ｂ４の空気と燃料の重量比位置（以下ｂ点
と略す）、３１は混合気体Ｃ２１の空気と燃料の
重量比位置（以下ｃ点と略し、このｃ点の空気比
は0.5〜1.0である）、３２は混合気体Ｄ２２の空
気と燃料の重量比位置（以下ｄ点と略す）を夫々
示している。 Figure 6 shows the relationship between the weight ratio of air and pulverized fuel in the pulverized fluid and the flame propagation speed.
5 is a flame propagation curve of a general pulverized fuel (hereinafter abbreviated as curve Limit line (hereinafter abbreviated as line X),
28 is the limit line where ignition is particularly stable for low-grade pulverized fuel (hereinafter abbreviated as line Y), 29 is the air/fuel weight ratio position of mixed gas A3 (hereinafter abbreviated as point a), and 30 is the air of mixed gas B4. and the weight ratio position of fuel (hereinafter abbreviated as point b), 31 is the weight ratio position of air and fuel of the mixed gas C21 (hereinafter abbreviated as point c, the air ratio at point c is 0.5 to 1.0), 32 is The weight ratio positions of air and fuel in the mixed gas D22 (hereinafter abbreviated as point d) are shown.
この火炎伝播曲線は曲線Ｘ２５，Ｙ２６より下
側の領域は火炎が形成され、燃焼が維持できる着
火領域、上側は火炎が形成されない領域であるこ
とを示している。又、曲線Ｘ２５と線Ｘ２７及び
曲線Ｙ２６と線Ｙ２８で囲まれる領域は特に着火
の安定性が良い安定着火領域であることを示して
いる。 This flame propagation curve shows that the area below the curves X25 and Y26 is the ignition area where flame is formed and combustion can be maintained, and the area above is the area where no flame is formed. Further, the region surrounded by the curve X25 and the line X27 and the curve Y26 and the line Y28 is a stable ignition region where the ignition stability is particularly good.
従来のバーナで一般的な微粉燃料を使用する場
合は、濃微粉流体３と淡微粉流体４が噴射される
が空気と燃料の重量比位置はそれぞれａ点２９、
ｂ点３０に位置されている。ａ点２９は安定着火
領域であり、濃微粉流体３は安定した火炎が得ら
れる。しかし、淡微粉流体４は単独では安定着火
の維持は困難であり、濃微粉流体３の火炎と共存
することにより安定した着火と燃焼が維持でき
る。ところが、従来のバーナにて低品位微粉燃料
を燃焼させる場合には、低品位微粉燃料の安定着
火領域外に混合気体の空気と燃料の重量比が位置
するため、着火が困難となつていた。 When using common pulverized fuel in a conventional burner, dense pulverized fluid 3 and light pulverized fluid 4 are injected, but the weight ratio positions of air and fuel are at point a 29, respectively.
It is located at point b 30. Point a 29 is a stable ignition region, and a stable flame can be obtained from the concentrated powder fluid 3. However, it is difficult to maintain stable ignition using the light powder fluid 4 alone, and stable ignition and combustion can be maintained by coexisting with the flame of the dense powder fluid 3. However, when burning low-grade pulverized fuel in a conventional burner, ignition is difficult because the weight ratio of air and fuel in the mixed gas is outside the stable ignition range of low-grade pulverized fuel.
本考案のバーナでは、淡微粉流体４、高濃微粉
流体２１、低濃微粉流体２２の３種類の微粉燃料
が同時に噴射されることになるが、高濃微粉流体
２１は低品位微粉燃料の安定着火領域のｃ点３１
に位置することになり、安定着火が得られ、淡微
粉流体４、低濃微粉流体２２もこの火炎と共存す
ることにより安定した着火と燃焼が維持できるこ
とになる。 In the burner of the present invention, three types of pulverized fuel are simultaneously injected: a light pulverized fluid 4, a highly concentrated pulverized fluid 21, and a low-density pulverized fluid 22. Point c 31 in the ignition region
As a result, stable ignition can be obtained, and stable ignition and combustion can be maintained by the presence of the light pulverized fluid 4 and the slightly concentrated pulverized fluid 22 together with this flame.
なお、流体の噴出口にブロツク２３を設けてあ
るので、ブロツクの両面に沿つて濃度の異なる２
種類の微粉流体２１，２２が炉内へ噴射される。
そして、このブロツク２３によつて渦流２４が発
生し、この渦流２４内で着火した火炎が常時火種
となるので、安定な燃焼を維持することができ
る。 Note that since a block 23 is provided at the fluid spout, two fluids with different concentrations are distributed along both sides of the block.
Different types of pulverized fluids 21, 22 are injected into the furnace.
A vortex 24 is generated by this block 23, and the flame ignited within this vortex 24 always serves as a ignition source, so that stable combustion can be maintained.
考案の効果
以上詳述したように、本考案によれば、低品位
微粉燃料を使用しても安定な着火が得られる如
く、広範囲の微粉燃料に対して保炎、着火性が良
好で安定な燃焼を維持するとともに低NOxも保
つことのできる微粉燃料バーナが提供される。Effects of the invention As detailed above, according to the invention, stable ignition can be obtained even when using low-grade pulverized fuel, and flame holding and ignitability are good and stable for a wide range of pulverized fuels. A pulverized fuel burner is provided that can maintain combustion while also maintaining low NOx.
第１図は本考案に係る微粉燃料バーナの一実施
例を示す断面図、第２図は第１図の−線方向
矢視図、第３図は第１図の−線に沿う断面
図、第４図は第３図の−線に沿う断面図、第
５図は第３図の−線に沿う断面図、第６図は
本考案の作用を説明するために示した特性図、第
７図は従来の微粉燃料バーナの正面図、第８図は
第７図の−線に沿う断面図、第９図は第８図
の−線方向矢視図、第１０図は第９図の−
線に沿う断面図である。
２……分配器、５……濃微粉流搬送管、６……
淡微粉流搬送管、７……微粉燃料噴射ノズル、２
０……仕切板、２１……高濃微粉流、２２……低
濃微粉流、２３……ブロツク。
FIG. 1 is a sectional view showing an embodiment of the pulverized fuel burner according to the present invention, FIG. 2 is a sectional view taken along the - line direction of FIG. 1, and FIG. 3 is a sectional view taken along the - line of FIG. 4 is a sectional view taken along the - line in FIG. 3, FIG. 5 is a sectional view taken along the - line in FIG. 3, FIG. 6 is a characteristic diagram shown to explain the operation of the present invention, and The figure is a front view of a conventional pulverized fuel burner, FIG. 8 is a sectional view taken along the - line of FIG. 7, FIG. 9 is a view taken along the - line direction of FIG. 8, and FIG.
It is a sectional view along a line. 2... Distributor, 5... Concentrated fine powder flow conveyor pipe, 6...
Light fine powder flow conveying pipe, 7... Fine powder fuel injection nozzle, 2
0...Partition plate, 21...High concentration fine powder flow, 22...Low concentration fine powder flow, 23...Block.
Claims (1)
体及び淡微粉流体を夫々搬送する濃微粉流通路及
び淡微粉流通路がそれぞれ中央部に開口する一対
の微粉燃料噴射ノズルを備えている微粉燃料バー
ナにおいて、前記濃微粉流通路に前記濃微粉流体
の濃度状態が異なるように高濃微粉流と低微粉流
とに分離する分配器を介装して成る微粉燃料バー
ナ。 A pulverized fuel burner equipped with a pair of pulverized fuel injection nozzles each having a dense pulverized flow passage and a light pulverized flow passage each opening in the center for conveying a rich pulverized fluid and a light pulverized fluid having different mixing states of pulverized fuel and air, respectively. A pulverized fuel burner in which a distributor is installed in the concentrated pulverized powder flow path to separate the concentrated pulverized fluid into a high-density pulverized powder flow and a low-densified pulverized powder flow so that the concentrated pulverized fluid has different concentration states.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11595985U JPH0324969Y2 (en) | 1985-07-30 | 1985-07-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11595985U JPH0324969Y2 (en) | 1985-07-30 | 1985-07-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6224209U JPS6224209U (en) | 1987-02-14 |
| JPH0324969Y2 true JPH0324969Y2 (en) | 1991-05-30 |
Family
ID=31000104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11595985U Expired JPH0324969Y2 (en) | 1985-07-30 | 1985-07-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0324969Y2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011127836A (en) | 2009-12-17 | 2011-06-30 | Mitsubishi Heavy Ind Ltd | Solid fuel burning burner and solid fuel burning boiler |
| JP5374404B2 (en) | 2009-12-22 | 2013-12-25 | 三菱重工業株式会社 | Combustion burner and boiler equipped with this combustion burner |
| JP5799443B2 (en) * | 2014-09-11 | 2015-10-28 | 三菱日立パワーシステムズ株式会社 | Fuel burner, solid fuel fired burner, and solid fuel fired boiler |
| JP6246709B2 (en) * | 2014-12-19 | 2017-12-13 | 三菱日立パワーシステムズ株式会社 | Combustion burner and boiler |
-
1985
- 1985-07-30 JP JP11595985U patent/JPH0324969Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6224209U (en) | 1987-02-14 |
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