JPH0449449Y2 - - Google Patents
Info
- Publication number
- JPH0449449Y2 JPH0449449Y2 JP1986179687U JP17968786U JPH0449449Y2 JP H0449449 Y2 JPH0449449 Y2 JP H0449449Y2 JP 1986179687 U JP1986179687 U JP 1986179687U JP 17968786 U JP17968786 U JP 17968786U JP H0449449 Y2 JPH0449449 Y2 JP H0449449Y2
- Authority
- JP
- Japan
- Prior art keywords
- combustion chamber
- air
- pulverized solid
- solid fuel
- 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
Links
- 238000002485 combustion reaction Methods 0.000 claims description 104
- 239000004449 solid propellant Substances 0.000 claims description 27
- 239000000446 fuel Substances 0.000 claims description 14
- 238000007664 blowing Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 3
- 239000003830 anthracite Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000002678 semianthracite Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 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、燃料として微粉固体を使用するボイ
ラ及び化学工業炉等の燃焼装置に関する。[Detailed Description of the Invention] Industrial Application Field The present invention relates to combustion devices such as boilers and chemical industrial furnaces that use finely powdered solids as fuel.
従来の技術
ボイラ等の微粉固体燃焼装置の従来例として、
第５及び６図に示すふたつの例がある。Conventional technology As a conventional example of a pulverized solid combustion device such as a boiler,
There are two examples shown in Figures 5 and 6.
まず、第５図に示す従来例においては、火炉本
体１は、この本体の下部をなす下部燃焼室２と上
部をなす上部燃焼室３とにより形成されている。
そして、火炉本体１の高さ方向の中間位置から底
部にかけて、下部燃焼室２の前壁４（又は後壁）
が横に張り出されているとともに、この張り出さ
れた天井部５にはバーナ風箱本体６が設けられて
いる。このバーナ風箱本体は、さらに１次空気コ
ンパートメント７，２次空気コンパートメント８
及びジエツト空気コンパートメント９から構成さ
れている。 First, in the conventional example shown in FIG. 5, a furnace body 1 is formed of a lower combustion chamber 2 forming the lower part of the main body and an upper combustion chamber 3 forming the upper part.
The front wall 4 (or rear wall) of the lower combustion chamber 2 extends from the middle position in the height direction of the furnace body 1 to the bottom.
is jutted out laterally, and a burner-like box body 6 is provided on this jutted ceiling portion 5. This burner wind box body further includes a primary air compartment 7 and a secondary air compartment 8.
and a jet air compartment 9.
それから、１次空気コンパートメント７には１
次空気ノズル７′，２次空気コンパートメント８
には２次空気ノズル８′、ジエツト空気コンパー
トメント９にはジエツト空気ノズル９′が設けら
れている。 Then, the primary air compartment 7 has 1
Secondary air nozzle 7', secondary air compartment 8
A secondary air nozzle 8' is provided in the jet air compartment 9, and a jet air nozzle 9' is provided in the jet air compartment 9.
このようなバーナ風箱本体６の各コンパートメ
ント７，８，９には、図示されていない通風装置
に接続している主燃焼用空気管１０を通して主燃
焼用空気１１が送り込まれる。すなわち、主燃焼
用空気管１０は、バーナ風箱本体６に入る前に１
次空気１１ａ、２次空気１１ｂ及びジエツト空気
１１ｃの３系統１０ａ，１０ｂ，１０ｃに分けら
れて各コンパートメント７，８，９に接続されて
おり、主燃焼用空気１１，１１ａ，１１ｂ，１１
ｃがこれらのコンパートメントに導入される。そ
して、これらの各空気１１ａ，１１ｂ，１１ｃは
各コンパートメント７，８，９の夫々に設けられ
ている各ノズル７′，８′，９′から下部燃焼室２
内へ吹き込まれる。 Main combustion air 11 is fed into each of the compartments 7, 8, 9 of the burner wind box main body 6 through a main combustion air pipe 10 connected to a ventilation device (not shown). That is, the main combustion air pipe 10 is
The main combustion air 11, 11a, 11b, 11 is divided into three systems 10a, 10b, 10c, which are secondary air 11a, secondary air 11b, and jet air 11c, and connected to each compartment 7, 8, 9.
c is introduced into these compartments. Each of these airs 11a, 11b, 11c flows into the lower combustion chamber 2 from each nozzle 7', 8', 9' provided in each compartment 7, 8, 9, respectively.
blown inward.
また、下部燃焼室２の前壁４には補助空気吹出
ポート１２が設けられており、前述の主燃焼用空
気１１，１１ａ，１１ｂ，１１ｃとともに、補助
空気１３が通風装置に接続している補助空気管１
４を通して、補助空気吹出ポート１２へ送り込ま
れた後、下部燃焼室２内へ吹き込まれる。 Further, an auxiliary air blow-off port 12 is provided on the front wall 4 of the lower combustion chamber 2, and in addition to the above-mentioned main combustion air 11, 11a, 11b, 11c, auxiliary air 13 is connected to the ventilation device. air pipe 1
4, the auxiliary air is sent to the blowout port 12, and then blown into the lower combustion chamber 2.
更に、１次空気コンパートメント７に設けられ
た１次空気ノズル７′にはバーナ１５が装着され
ていて、図示されていない微粉固体燃料供給源に
接続している微粉固体燃料輸送管１６を通して空
気輸送されてきた微粉固体燃料１７が１次空気１
１ａとともに下部燃焼室２へ下向きに吹き込まれ
る。 Furthermore, the primary air nozzle 7' provided in the primary air compartment 7 is fitted with a burner 15 and is air-transported through a pulverized solid fuel transport line 16 which is connected to a pulverized solid fuel supply source (not shown). The fine powder solid fuel 17 that has been used as primary air 1
It is blown downward into the lower combustion chamber 2 together with 1a.
そして、下部燃焼室２へ下向きに吹き込まれた
微粉固体燃料１７は、図示されていない着火源に
よつて着火され、下向きに火炎１８が形成される
が、Ｕ字形のガス流れに沿つて火炎１８の先端か
ら反転し、いわゆるＵ字形火炎１８ａが形成され
る。 The pulverized solid fuel 17 blown downward into the lower combustion chamber 2 is ignited by an ignition source (not shown), and a flame 18 is formed downward. The flame 18 is inverted from the tip, and a so-called U-shaped flame 18a is formed.
バーナ１５の周囲から吹き込まれる１次空気１
１ａは主として火炎１８の着火点近傍の燃焼に供
され、１次空気ノズル７′に隣接して設けられた
２次空気ノズル８′から吹き込まれる２次空気１
１ｂは、その後の燃焼に供される。 Primary air 1 blown from around the burner 15
1a is mainly used for combustion near the ignition point of the flame 18, and the secondary air 1a is blown in from a secondary air nozzle 8' provided adjacent to the primary air nozzle 7'.
1b is subjected to subsequent combustion.
一方、ジエツト空気１１ｃはＵ字形に形成され
た火炎１８ａの谷間（下降炎と上昇炎の間）に向
かつて高速度で吹き込まれ、下向き火炎１８の反
転が出来るだけ遅らされている。 On the other hand, the jet air 11c is blown at high speed toward the valley (between the descending flame and the ascending flame) of the U-shaped flame 18a, so that the reversal of the downward flame 18 is delayed as much as possible.
補助空気１３は、下部燃焼室２の前壁４（又は
後壁）にて設けられた補助空気吹出ポート１２か
ら下部燃焼室２内へ吹き込まれて、主燃焼用空気
１１で不足する分の酸素の供給が行なわれる。 The auxiliary air 13 is blown into the lower combustion chamber 2 from the auxiliary air blow-off port 12 provided on the front wall 4 (or rear wall) of the lower combustion chamber 2, and is filled with oxygen that is insufficient in the main combustion air 11. will be supplied.
以上のようにして形成されたＵ字形火炎１８ａ
は、下部燃焼室２内で燃え切ることが理想である
が、実際にはこの下部燃焼室の上方に配置する上
部燃焼室３にまで達せられることが多い。 U-shaped flame 18a formed as above
Ideally, the fuel should burn out completely within the lower combustion chamber 2, but in reality it often reaches the upper combustion chamber 3, which is located above the lower combustion chamber.
この他、従来の微粉固体燃料燃焼装置の従来例
として、第６図に示すようなものが知られてい
る。 In addition, as a conventional example of a conventional pulverized solid fuel combustion apparatus, one shown in FIG. 6 is known.
この従来例においては、火炉本体１の両側に下
部燃焼室２が張り出されて、これらの天井部５に
設けた各バーナ１５から微粉固体燃料１７が下向
きに吹き込まれ、両バーナ１５の火炎１８によつ
てＷ字形火炎１８ｂが形成されるものである。そ
の他の構成は第５図に示したものと同じであるの
で、同一の部分には同一の符号を付して、その詳
細な説明は省略する。 In this conventional example, lower combustion chambers 2 are extended on both sides of a furnace body 1, and pulverized solid fuel 17 is blown downward from each burner 15 provided on the ceiling 5 of these chambers, and the flames 18 of both burners 15 are blown downward. A W-shaped flame 18b is formed by this. Since the other configurations are the same as those shown in FIG. 5, the same parts are given the same reference numerals and detailed explanation thereof will be omitted.
このような従来の微粉固体燃料燃焼装置の特徴
は、バーナ１５廻り、即ち火炎１８周辺から吹き
込まれる主燃焼用空気１１，１１ａ，１１ｂ，１
１ｃの量が多いことである。しかも、補助空気１
３も併せて、下部燃焼室２にはほとんど全ての燃
焼用空気１１，１３が下部燃焼室２に供給され
る。 The feature of such a conventional pulverized solid fuel combustion device is that the main combustion air 11, 11a, 11b, 1 is blown in from around the burner 15, that is, around the flame 18.
The amount of 1c is large. Moreover, auxiliary air 1
3, almost all of the combustion air 11, 13 is supplied to the lower combustion chamber 2.
考案が解決しようとする問題点
以上述べた従来の微粉固体燃焼装置は、しか
し、次のような問題点があつた。Problems to be solved by the invention The conventional pulverized solid combustion apparatus described above, however, had the following problems.
従来の微粉固体燃料燃焼装置では火炎１８周辺
から吹き込む主燃焼用空気１１，１１ａ，１１
ｂ，１１ｃの量が多く、しかも、補助空気１３も
下部燃焼室２に吹き込まれるので、高温のガス流
がこれらの空気と接触して下部燃焼室２における
ガス温度が低下していた。特に熱負荷が低いバー
ナ１５口近傍では、火炎１８に対する主燃焼用空
気１１による冷却効果が高いため、着火点近傍の
雰囲気温度が低下して着火点が不安定となつてい
た。殊に、無煙炭のように揮発分が少なく、燃料
比（固定炭素分／揮発分）が高い微粉固体燃料１７の場
合はこの傾向がかなり強く、着火点近傍の雰囲気
温度が低下するにつれ、益々着火点がバーナ１５
口から離れるようになり遂には失火してしまうこ
ともあつた。また、全燃焼用空気１１，１３を下
部燃焼室２へ供給するためこの下部燃焼室及び上
部燃焼室３における燃料粒子の滞留時間が短かく
なつて未燃損失が多くなる、といつた、欠点があ
つた。 In a conventional pulverized solid fuel combustion device, main combustion air 11, 11a, 11 is blown in from around the flame 18.
Since the amount of air b, 11c was large and the auxiliary air 13 was also blown into the lower combustion chamber 2, the high temperature gas flow came into contact with these airs and the gas temperature in the lower combustion chamber 2 decreased. In particular, near the burner 15 where the heat load is low, the cooling effect of the main combustion air 11 on the flame 18 is high, so the atmospheric temperature near the ignition point drops and the ignition point becomes unstable. This tendency is particularly strong in the case of pulverized solid fuels17, such as anthracite, which have a low volatile content and a high fuel ratio (fixed carbon content/volatile content), and as the ambient temperature near the ignition point decreases, the ignition point becomes more and more burner 15
The flames started to come away from my mouth and sometimes I ended up misfiring. In addition, since all the combustion air 11, 13 is supplied to the lower combustion chamber 2, the residence time of fuel particles in the lower combustion chamber and the upper combustion chamber 3 is shortened, resulting in a large amount of unburned loss. It was hot.
問題点を解決するための手段
本考案は、従来のこのような問題点を解決する
ために、微粉固体を燃料とするボイラ等の下部及
び上部燃焼室からなる火炉本体の中間高さで、前
後壁のうち片側又は両側を横に張り出した前記下
部燃焼室の天井部へバーナを下向きに設け、この
バーナから前記下部燃焼室内に吹き込まれる前記
微粉固体燃料を燃焼させて生成するガス流が、Ｕ
字形又はＷ字形等の火炎を形成する微粉固体燃料
燃焼装置において、前記下部燃焼室内に投入する
燃焼用空気の空気比を0.5〜1.0と設定し、かつ前
記上部燃焼室の前後壁には補助空気を上部燃焼室
内の火炎又はその後流のガス流に対してタンゼン
シヤル方向に吹き込む補助空気吹出ポートを設け
たものである。Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention aims to solve the above-mentioned problems with the conventional method. A burner is installed downward on the ceiling of the lower combustion chamber that extends horizontally on one or both sides of the wall, and the gas flow generated by burning the pulverized solid fuel blown into the lower combustion chamber from the burner is
In a pulverized solid fuel combustion device that forms a flame shaped like a letter or a letter W, the air ratio of the combustion air introduced into the lower combustion chamber is set to 0.5 to 1.0, and auxiliary air is provided on the front and rear walls of the upper combustion chamber. The combustion chamber is equipped with an auxiliary air blowing port that blows air into the flame in the upper combustion chamber or the gas flow downstream thereof in the tangential direction.
作 用
このような手段によれば、下部燃焼室内の雰囲
気温度が高まり、且つ、ガス量が少ないため、微
粉固体燃料の下部燃焼室内における滞留時間が長
くなつて、火炎の着火が安定し、燃焼性が向上す
るとともに、補助空気を上部燃焼室に吹き込むこ
とにより燃焼排ガス中のNOxが低減される。Effect: According to such means, the atmospheric temperature in the lower combustion chamber increases and the amount of gas is small, so the residence time of the pulverized solid fuel in the lower combustion chamber becomes longer, stabilizing the ignition of the flame, and improving combustion. In addition to improving fuel efficiency, blowing auxiliary air into the upper combustion chamber reduces NOx in the combustion exhaust gas.
実施例
以下第１〜４図を参照して、本考案の実施例に
ついて詳述する。なお、これらの図において、第
５及び６図に示したものと同一の部分には同一の
符号を付して、その詳細な説明は省略する。Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4. In these figures, the same parts as shown in FIGS. 5 and 6 are designated by the same reference numerals, and detailed explanation thereof will be omitted.
しかして、第１図に示す第１実施例は第５図に
示した従来例に本考案を適用したものであり、従
来、下部燃焼室２の天井部５に配置してある風箱
本体６の各コンパートメント７，８，９のうち、
２次空気コンパートメント８、及び２次空気ノズ
ル８′を設けない構造とされ、かつ、同じく下部
燃焼室２の前壁４側には補助空気吹出ポート１２
は設けず、その代わりに上部燃焼室３の前後壁３
ａ，３ｂ側に新たに設けた構造とされている。 The first embodiment shown in FIG. 1 is an application of the present invention to the conventional example shown in FIG. Of each compartment 7, 8, 9,
The structure is such that the secondary air compartment 8 and the secondary air nozzle 8' are not provided, and an auxiliary air blowing port 12 is also provided on the front wall 4 side of the lower combustion chamber 2.
is not provided, but instead the front and rear walls 3 of the upper combustion chamber 3 are
A new structure is provided on the a and 3b sides.
以上のような構成において、主燃焼用空気１
１，１１ａ，１１ｃは１次空気ノズル７′とジエ
ツト空気ノズル９′とから吹き込まれるが、その
吹き込み量は微粉固体燃料１７の燃焼時における
下部燃焼室２の空気比
（λ＝
１次空気量＋ジエツト空気量＋搬送用空気量／微粉固体
燃料量＋理論燃焼空気量）
がλ＝0.5〜1.0となるように投入されている。 In the above configuration, the main combustion air 1
1, 11a, and 11c are blown in from the primary air nozzle 7' and the jet air nozzle 9', and the amount blown in is determined by the air ratio (λ=
Primary air amount + jet air amount + conveying air amount / pulverized solid fuel amount + theoretical combustion air amount) is injected so that λ = 0.5 to 1.0.
すなわち、無煙炭、半無煙炭などの高燃料比の
微粉固体燃料１７を燃焼させる場合、下部燃焼室
２への投入空気量を多くすると、微粉固体燃料自
体の燃焼速度が遅い上に、下部燃焼室２での燃料
の滞留時間が短くなるので、充分に燃焼しないう
ちに下部燃焼室２を出ることになり、下部燃焼室
２内を所定温度まで高めることができない。 That is, when combusting pulverized solid fuel 17 with a high fuel ratio such as anthracite or semi-anthracite, if the amount of air introduced into the lower combustion chamber 2 is increased, the combustion speed of the pulverized solid fuel itself is slow, and the lower combustion chamber 2 Since the residence time of the fuel becomes short, the fuel leaves the lower combustion chamber 2 before it is fully combusted, and the inside of the lower combustion chamber 2 cannot be raised to a predetermined temperature.
したがつて、このような高燃料比の微粉固体燃
料１７の場合は、下部燃焼室２への燃焼用空気１
１ａ，１１ｃの投入量を低く抑えて出来るだけ下
部燃焼室２における燃焼ガス（火炎１８）の滞留
時間を長く採つてやることが肝要である。 Therefore, in the case of the pulverized solid fuel 17 with such a high fuel ratio, the combustion air 1 to the lower combustion chamber 2
It is important to keep the input amounts of 1a and 11c low so that the residence time of the combustion gas (flame 18) in the lower combustion chamber 2 is as long as possible.
しかし、燃焼用空気量が少なすぎても可能な燃
料燃焼量が低下するので、下部燃焼室内温度を適
温迄高めることが不可能となり、結果的には燃焼
不良となる。 However, even if the amount of combustion air is too small, the amount of fuel that can be burned is reduced, making it impossible to raise the temperature in the lower combustion chamber to an appropriate temperature, resulting in poor combustion.
そこで、本考案は、幾度もの燃焼試験の結果か
ら、下部燃焼室２１における燃焼用空気１１ａ，
１１ｃ量の下限値は空気比＝0.5が適当であり、
これならば無煙炭、半無煙炭などの高燃料比の微
粉固体燃料１７の自燃が可能であることを確認し
たものである。また、燃焼容易な低燃料比の微粉
固体燃料１７については、下部燃焼室２の空気比
は1.0で十分であり、1.0以上の空気比をもつて
も、燃焼の性能はほとんど変化することがなく、
過剰に空気量を投入する意味がないからである。 Therefore, in the present invention, based on the results of numerous combustion tests, the combustion air 11a in the lower combustion chamber 21,
The appropriate lower limit for the amount of 11c is air ratio = 0.5.
This confirms that self-combustion of fine powder solid fuel 17 with a high fuel ratio such as anthracite coal or semi-anthracite coal is possible. Furthermore, for the pulverized solid fuel 17 with a low fuel ratio that is easy to burn, an air ratio of 1.0 in the lower combustion chamber 2 is sufficient, and even if the air ratio is 1.0 or more, the combustion performance will hardly change. ,
This is because there is no point in introducing an excessive amount of air.
そして、この所定の空気比で燃焼を完結するた
めに必要な残りの燃焼用空気は、補助空気吹出ポ
ート１２から補助空気１３が上部燃焼室３に投入
されることにより補われ、NOxが低減される。
この補助空気吹出ポート１２は、第２図に良く示
すように、上部燃焼室３に伸びてくる夫々の火炎
１８ａの先端部に対して、補助空気１３をタンゼ
ンシヤル方向に吹き込むよう、上部燃焼室３の前
後壁３ａ，３ｂに設けられ、これにより補助空気
１３と燃焼排ガスとの拡散混合が促進されて、未
燃分が著しく低減される。 The remaining combustion air required to complete combustion at this predetermined air ratio is supplemented by auxiliary air 13 injected into the upper combustion chamber 3 from the auxiliary air blowout port 12, reducing NOx . be done.
As clearly shown in FIG. 2, this auxiliary air blowing port 12 is designed to blow auxiliary air 13 into the upper combustion chamber 3 in a tangential direction toward the tip of each flame 18a extending into the upper combustion chamber 3. This promotes diffusion and mixing of the auxiliary air 13 and the combustion exhaust gas, thereby significantly reducing unburned matter.
従つて、バーナ１５周辺から投入される主燃焼
用空気１１量を減じる一方、補助空気１３が上部
燃焼室３から投入されるようにして、下部燃焼室
２の空気比を0.5〜1.0と低く抑えることにより、
この下部燃焼室内の雰囲気温度が高まり、かつ、
ガス量が少ないため、微粉固体燃料１７の下部燃
焼室２内における滞留時間が長くなつて火炎の着
火点が安定し、よつて燃焼性が向上する。 Therefore, while reducing the amount of main combustion air 11 introduced from around the burner 15, auxiliary air 13 is introduced from the upper combustion chamber 3 to keep the air ratio in the lower combustion chamber 2 as low as 0.5 to 1.0. By this,
The atmospheric temperature inside this lower combustion chamber increases, and
Since the amount of gas is small, the residence time of the pulverized solid fuel 17 in the lower combustion chamber 2 becomes longer, the ignition point of the flame is stabilized, and the combustibility is improved.
また、補助空気１３が補助空気吹出ポート１２
より上部燃焼室３に吹き込まれることによつて
NOxが低減される。そして、この場合、補助空
気１３が夫々の火炎１８ａ又は後流のガス流に対
して、タンゼンシヤル方向に吹き込まれることに
より、補助空気１３と燃焼排ガスとの拡散混合が
促進されて未燃分が著しく低減されるため燃焼効
率が高まる。 Also, the auxiliary air 13 is connected to the auxiliary air blow-off port 12.
By being blown into the upper combustion chamber 3
NO x is reduced. In this case, the auxiliary air 13 is blown into the respective flames 18a or the trailing gas flow in the tangential direction, thereby promoting diffusion mixing of the auxiliary air 13 and the combustion exhaust gas, and significantly reducing unburned matter. This reduces combustion efficiency.
次に、第３及び４図は本考案の第２実施例を示
し、この実施例は本考案を第６図に示した従来例
に適用したものである。 Next, FIGS. 3 and 4 show a second embodiment of the present invention, in which the present invention is applied to the conventional example shown in FIG.
この場合にも、前述の第１の実施例の場合と同
様に、上部燃焼室３の前後壁３ａ，３ｂ側に補助
空気吹出ポート１２が設けられ、これによりほぼ
同じ作用が得られる。 In this case as well, the auxiliary air blow-off ports 12 are provided on the front and rear walls 3a, 3b of the upper combustion chamber 3, as in the first embodiment described above, thereby achieving substantially the same effect.
考案の効果
以上詳述したように、本考案によれば、下部燃
焼室の雰囲気温度が高まり、微粉固体燃料の滞留
時間も十分長くなつて火炎の着火点が安定し、燃
焼性がかなり向上するとともに補助空気を上部燃
焼室に吹き込むことにより燃焼排ガス中のNOx
が低減される効果が得られる。Effects of the invention As detailed above, according to the invention, the atmospheric temperature in the lower combustion chamber increases, the residence time of the pulverized solid fuel becomes sufficiently long, the ignition point of the flame becomes stable, and the combustibility improves considerably. NOx in the flue gas is reduced by blowing auxiliary air into the upper combustion chamber.
This has the effect of reducing the
第１図は本考案による微粉固体燃料燃焼装置の
一例を示す要部断面図、第２図は第１図の−
線横断面図、第３図は本考案による微粉固体燃料
燃焼装置の他の例を示す要部断面図、第４図は第
３図の−線横断面図、第５図は従来の微粉固
体燃料燃焼装置を示す要部断面図、第６図はその
他の従来例を示す要部断面図である。
１……火炉本体、２……下部燃焼室、３……上
部燃焼室、４……前壁、５……天井部、１２……
補助空気吹出ポート、１５……バーナ、１７……
微粉固体燃料、１８……火炎、１８ａ……Ｕ字形
の火炎、１８ｂ……Ｗ字形の火炎。
Fig. 1 is a cross-sectional view of essential parts showing an example of a pulverized solid fuel combustion device according to the present invention, and Fig. 2 is a -
3 is a cross-sectional view of main parts showing another example of the pulverized solid fuel combustion device according to the present invention, FIG. 4 is a cross-sectional view taken along the - line of FIG. 3, and FIG. 5 is a conventional pulverized solid fuel combustion device. FIG. 6 is a sectional view of a main part showing a fuel combustion device, and FIG. 6 is a sectional view of a main part showing another conventional example. 1...Furnace body, 2...Lower combustion chamber, 3...Upper combustion chamber, 4...Front wall, 5...Ceiling part, 12...
Auxiliary air blowout port, 15... Burner, 17...
Fine powder solid fuel, 18...Flame, 18a...U-shaped flame, 18b...W-shaped flame.
Claims (1)
燃焼室からなる火炉本体の中間高さで、前後壁の
うち片側又は両側を横に張り出した前記下部燃焼
室の天井部へバーナを下向きに設け、このバーナ
から前記下部燃焼室内に吹き込まれる前記微粉固
体燃料を燃焼させて生成するガス流が、Ｕ字形又
はＷ字形等の火炎を形成する微粉固体燃料燃焼装
置において、前記下部燃焼室内に投入する燃焼用
空気の空気比を0.5〜1.0と設定し、かつ前記上部
燃焼室の前後壁には補助空気を上部燃焼室内の火
炎又はその後流のガス流に対してタンゼンシヤル
方向に吹き込む補助空気吹出ポートを設けたこと
を特徴とする微粉固体燃料燃焼装置。 A burner is provided facing downward on the ceiling of the lower combustion chamber which extends laterally on one or both sides of the front and rear walls at an intermediate height of the furnace body consisting of the lower and upper combustion chambers of a boiler etc. that uses pulverized solid as fuel, In a pulverized solid fuel combustion apparatus in which a gas flow generated by burning the pulverized solid fuel blown into the lower combustion chamber from this burner forms a U-shaped or W-shaped flame, the pulverized solid fuel is injected into the lower combustion chamber. The air ratio of the service air is set to 0.5 to 1.0, and auxiliary air blowing ports are provided on the front and rear walls of the upper combustion chamber to blow auxiliary air into the flame in the upper combustion chamber or the gas flow downstream thereof in a tangential direction. A pulverized solid fuel combustion device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986179687U JPH0449449Y2 (en) | 1986-11-25 | 1986-11-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986179687U JPH0449449Y2 (en) | 1986-11-25 | 1986-11-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6386509U JPS6386509U (en) | 1988-06-06 |
| JPH0449449Y2 true JPH0449449Y2 (en) | 1992-11-20 |
Family
ID=31122963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986179687U Expired JPH0449449Y2 (en) | 1986-11-25 | 1986-11-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0449449Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5233912B2 (en) * | 2009-08-28 | 2013-07-10 | 株式会社Ｉｈｉ | Fine powder combustion test equipment |
| JP5986895B2 (en) * | 2012-11-12 | 2016-09-06 | 三菱重工業株式会社 | boiler |
| KR101901293B1 (en) | 2016-09-26 | 2018-09-28 | 주식회사 미로 | Floating type of humidifier for improving humidity |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58120002A (en) * | 1982-01-13 | 1983-07-16 | Mitsubishi Heavy Ind Ltd | Boiler |
-
1986
- 1986-11-25 JP JP1986179687U patent/JPH0449449Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58120002A (en) * | 1982-01-13 | 1983-07-16 | Mitsubishi Heavy Ind Ltd | Boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6386509U (en) | 1988-06-06 |
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