JPH0222288B2 - - Google Patents
Info
- Publication number
- JPH0222288B2 JPH0222288B2 JP56108857A JP10885781A JPH0222288B2 JP H0222288 B2 JPH0222288 B2 JP H0222288B2 JP 56108857 A JP56108857 A JP 56108857A JP 10885781 A JP10885781 A JP 10885781A JP H0222288 B2 JPH0222288 B2 JP H0222288B2
- Authority
- JP
- Japan
- Prior art keywords
- pulverized coal
- wall
- burner
- supply pipe
- coal supply
- 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
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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)
Description
【発明の詳細な説明】
本発明は微粉炭燃焼バーナに係り、特に耐熱及
び耐摩耗性を向上させた微粉炭燃焼バーナに関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulverized coal combustion burner, and more particularly to a pulverized coal combustion burner with improved heat resistance and wear resistance.
一般に微粉炭燃焼用バーナの摩耗はバーナの内
壁面に衝突する微粉炭粒子により、そこに切削や
亀裂を生ずるために起こるものが多いと考えられ
ている。その要因となるものは、微粉炭粒子の硬
度、粒子径、粒子形状、粒子の衝突速度、粒子の
衝突量、粒子濃度およびバーナ壁面との衝突角度
などがある。 It is generally believed that wear of pulverized coal combustion burners is caused mostly by pulverized coal particles colliding with the inner wall surface of the burner, causing cuts and cracks there. The factors include the hardness of the pulverized coal particles, particle diameter, particle shape, particle collision speed, particle collision amount, particle concentration, and collision angle with the burner wall surface.
微粉炭燃焼に用いられる一般炭の炭化度は約80
〜85％程度であり、石炭の種類の中では硬度が高
い方である。また平均粒子径は、一般的に50×
10-6ｍ程度であり、粉砕設備およびコスト面でこ
れ以上小さくはできない。更に微粉炭のバーナへ
の供給手段は空気に依るものが多く、その流速は
微粉炭の堆積あるいは炭塵爆発防止の点から20
ｍ／ｓ以上にすることが一般的である。従つて、
バーナの摩耗の度合は主に微粉炭の供給量に依存
することとなり、高熱量を得るための燃焼を行な
う場合には、それだけ摩耗の度合も大きくなると
いうものであつた。 The degree of carbonization of steam coal used for pulverized coal combustion is approximately 80.
It has a hardness of ~85%, which is higher among the types of coal. In addition, the average particle size is generally 50×
It is approximately 10 -6 m, and cannot be made any smaller due to crushing equipment and cost considerations. Furthermore, the means of supplying pulverized coal to the burner often relies on air, and the flow rate is limited to 20% from the viewpoint of preventing pulverized coal accumulation or coal dust explosion.
It is common to set it to m/s or more. Therefore,
The degree of burner wear mainly depends on the amount of pulverized coal supplied, and when combustion is performed to obtain a high amount of heat, the degree of wear increases accordingly.
この種の微粉炭燃焼バーナとしては、例えば第
１図に示すように、大径の微粉炭供給管１の内部
にこれより小径の空気供給管２を設けて２重管構
造としたものが使用され、微粉炭供給管１の内壁
３と空気供給管２の外壁４との間を微粉炭と微粉
炭供給用の空気との混合流体が流れる微粉炭供給
路５とし、空気供給管２の内部を燃焼用一次空気
が流れる空気供給路６として構成されている。ま
た微粉炭供給管１の後端には、上記混合流体を微
粉炭供給路５に導くための輸送管７が斜め上方か
ら接続されている。尚、この輸送管７は、第２図
に示すように、バーナＢの中心から偏心した位置
に接続され、これによつて混合流体は旋回しなが
ら微粉炭供給路５に導かれるため、微粉炭粒子と
供給用空気との混合が促進される。 As shown in Fig. 1, this type of pulverized coal combustion burner has a double pipe structure in which an air supply pipe 2 of a smaller diameter is provided inside a large diameter pulverized coal supply pipe 1. A pulverized coal supply path 5 is defined in which a mixed fluid of pulverized coal and air for pulverized coal supply flows between the inner wall 3 of the pulverized coal supply pipe 1 and the outer wall 4 of the air supply pipe 2, and the inside of the air supply pipe 2 is is configured as an air supply path 6 through which primary air for combustion flows. Further, a transport pipe 7 for guiding the mixed fluid to the pulverized coal supply path 5 is connected to the rear end of the pulverized coal supply pipe 1 from diagonally above. As shown in FIG. 2, this transport pipe 7 is connected to a position eccentric from the center of the burner B, so that the mixed fluid is guided to the pulverized coal supply path 5 while swirling. Mixing of the particles with the supply air is facilitated.
一方、バーナＢの噴出口８近傍は、微粉炭供給
管１の内壁３および空気供給管２の外壁４が他の
部分よりも盛り上がり成形され、微粉炭供給路５
が幅狭に形成されている。これは上述したよう
に、微粉炭の平均粒子径が50×10-6ｍ程度であ
り、また微粉炭の燃焼が大体1500℃以上で行われ
ることから、微粉炭の燃焼速度がガス境膜拡散律
速になつていることが多く、そのため微粉炭の燃
焼速度を増加させるため微粉炭粒子の相対速度を
増加させる必要があることからバーナ噴出口８近
傍の微粉炭供給路５を他の部分よりも狭く形成し
なければならないものである。また、この噴出口
８近傍には、微粉炭供給路５を一定幅に保持する
保持部材９が微粉炭供給管１の内壁３と空気供給
管２の外壁４との間に介装されている。 On the other hand, near the ejection port 8 of the burner B, the inner wall 3 of the pulverized coal supply pipe 1 and the outer wall 4 of the air supply pipe 2 are formed to be more raised than other parts, and the pulverized coal supply path 5
is formed narrowly. This is because, as mentioned above, the average particle size of pulverized coal is about 50 × 10 -6 m, and pulverized coal is burned at temperatures above 1500°C, so the combustion rate of pulverized coal is controlled by gas film diffusion. Therefore, in order to increase the combustion speed of pulverized coal, it is necessary to increase the relative velocity of pulverized coal particles. It must be formed narrowly. Further, near this jet port 8, a holding member 9 for holding the pulverized coal supply path 5 at a constant width is interposed between the inner wall 3 of the pulverized coal supply pipe 1 and the outer wall 4 of the air supply pipe 2. .
しかしこのように構成される従来の一般的な微
粉炭燃焼用バーナＢにあつては輸送管７が接続さ
れる微粉炭供給路５の後端部近傍の周壁が流速20
ｍ／ｓ以上の旋回流として導入された混合流体中
の微粉炭粒子の多衝突を受け、第１図中に符号ａ
で示すように後端部周辺の内壁３および外壁４が
摩耗され易い。また一方、バーナＢの噴出口８近
傍では微粉炭供給路５が幅狭に形成されているた
めに、微粉炭供給路５の内面に当たる微粉炭粒子
の衝突量が多く、また該部分では微粉炭粒子速度
も増加するので、第１図及び第３図中に符号ｂで
示すように、噴出口８近傍における微粉炭供給管
１の内壁３および空気供給管２の外壁４部分の摩
耗が激しくなる。特に噴出口８近傍部分は、微粉
炭燃焼火炎からの輻射熱でかなりの高温になるた
め、バーナＢの先端が劣化し、耐摩耗性が低下し
て増々激しくなる。また内壁３と外壁４との間に
介装された保持部材９も当然に摩耗が激しくな
る。 However, in the conventional general pulverized coal combustion burner B configured as described above, the peripheral wall near the rear end of the pulverized coal supply path 5 to which the transport pipe 7 is connected has a flow rate of 20
Due to multiple collisions of pulverized coal particles in the mixed fluid introduced as a swirling flow of m/s or more, the symbol a in Fig. 1
As shown in , the inner wall 3 and outer wall 4 around the rear end are easily worn. On the other hand, since the pulverized coal supply path 5 is narrow in the vicinity of the ejection port 8 of the burner B, the amount of pulverized coal particles colliding with the inner surface of the pulverized coal supply path 5 is large, and in this area, the pulverized coal As the particle velocity also increases, the inner wall 3 of the pulverized coal supply pipe 1 and the outer wall 4 of the air supply pipe 2 in the vicinity of the spout 8 become more abraded, as shown by the symbol b in FIGS. 1 and 3. . In particular, the area near the ejection port 8 reaches a considerably high temperature due to the radiant heat from the pulverized coal combustion flame, so the tip of the burner B deteriorates and its wear resistance deteriorates, becoming more and more severe. Furthermore, the holding member 9 interposed between the inner wall 3 and the outer wall 4 also naturally undergoes severe wear.
このように、従来の微粉炭燃焼バーナでは、一
般にハードフエイシング加工した鋼鉄製のものが
使用されるため、その材質上摩耗を防ぐことがで
きず、そのためバーナの寿命が短くなつたり、ま
た摩耗により微粉炭供給路の噴出口の断面積が大
きくなり混合流体の流速が落ちて、燃焼効果が低
下するという問題点があつた他、摩耗した部分の
補修にも時間がかかるという問題点があつた。 In this way, conventional pulverized coal combustion burners are generally made of hard-facing steel, which cannot prevent wear due to the material, which shortens the life of the burner and increases wear. As a result, the cross-sectional area of the jet nozzle of the pulverized coal supply path becomes large, which causes the flow velocity of the mixed fluid to decrease, resulting in a reduction in combustion effectiveness.In addition, there is the problem that it takes time to repair worn parts. Ta.
本発明は、上記の観点に立つてなされたもので
ありその目的とするところは微粉炭燃焼バーナの
摩耗を受け易い部分、即ち微粉炭供給路内におい
て微粉炭の混合流体による衝突を激しく受ける輸
送管の接続部近傍および微粉炭供給路の噴出口部
分にセラミツク部材を設けることによつて、上記
従来の欠点を解消し、微粉炭燃焼効率を向上させ
ることができる他、長時間の使用に耐え、かつ補
修が簡略化することができる微粉炭燃焼用バーナ
を提供するものである。 The present invention has been made based on the above-mentioned viewpoint, and its purpose is to transport pulverized coal that is subjected to severe collisions by a mixed fluid in a portion of a pulverized coal combustion burner that is susceptible to wear, that is, in a pulverized coal supply path. By providing a ceramic member near the pipe connection and at the spout of the pulverized coal supply path, the above-mentioned conventional drawbacks can be overcome, pulverized coal combustion efficiency can be improved, and the material can withstand long-term use. The present invention provides a pulverized coal combustion burner that can be easily repaired.
尚、本発明で使用するセラミツクは、耐熱、耐
摩耗性に特に優れた材質のものを使用する。 It should be noted that the ceramic used in the present invention is a material that is particularly excellent in heat resistance and wear resistance.
以下添付図面に示す実施例に基づいて本発明を
詳細に説明する。 The present invention will be described in detail below based on embodiments shown in the accompanying drawings.
第４図乃至第６図は本発明の一実施例を示した
ものである。 4 to 6 show an embodiment of the present invention.
この実施例における燃焼用バーナＢは、先の実
施例と同様、同軸２重管構造からなり、外側の微
粉炭供給管１の内壁３と内側の空気供給管２の外
壁４との間に微粉炭供給路５が形成され、更に微
粉炭供給路５の後端部には微粉炭を供給用空気と
共にバーナＢ内に送り込むための輸送管７が接続
されている。そして輸送管７が接続される微粉炭
供給路５の空気と微粉炭とからなる混合流体供給
口１０近傍およびバーナＢ先端の噴出口８近傍に
は夫々耐熱および耐摩耗性のセラミツク部材１
１，１２が取り付けられている。 The combustion burner B in this embodiment has a coaxial double pipe structure as in the previous embodiment, and the pulverized coal is separated between the inner wall 3 of the outer pulverized coal supply pipe 1 and the outer wall 4 of the inner air supply pipe 2. A coal supply passage 5 is formed, and a transport pipe 7 for feeding the pulverized coal into the burner B together with supply air is connected to the rear end of the pulverized coal supply passage 5. Heat-resistant and wear-resistant ceramic members 1 are installed near the mixed fluid supply port 10 of air and pulverized coal in the pulverized coal supply path 5 to which the transport pipe 7 is connected, and near the spout 8 at the tip of the burner B, respectively.
1 and 12 are attached.
混合流体供給口１０近傍に取り付けられるセラ
ミツク部材１１は、更に微粉炭供給管１の内壁３
周面に取り付けられる内壁保護用セラミツク部材
１１ａと空気供給管２の外壁４周面に取り付けら
れる外壁保護用セラミツク部材１１ｂとで構成さ
れ、これらは共に内壁３および外壁４周面に沿つ
て密に取り付けられる円筒体形状からなる。 The ceramic member 11 attached near the mixed fluid supply port 10 is further attached to the inner wall 3 of the pulverized coal supply pipe 1.
It is composed of an inner wall protecting ceramic member 11a attached to the circumferential surface and an outer wall protecting ceramic member 11b attached to the outer wall 4 circumferential surface of the air supply pipe 2. It consists of a cylindrical shape that can be attached.
内壁保護用セラミツク部材１１ａの装着は、例
えば、微粉炭供給管１の外壁から差し込んだボル
ト１３によつて容易に行うことができ、また外壁
保護用セラミツク部材１１ｂの装着は、その先端
を空気供給管２の外壁４の一部に突出形成した固
定座１４に固定し、後端をバーナＢの後方から差
し込んだ固定ピース１５で固定することによつて
容易に行うことができる。尚、上記セラミツク部
材１１ａ，１１ｂを補修又は点検等のため離脱す
る場合には、ボルト１３及び固定ピース１５をは
ずすことによつて容易に行うことができる。 The ceramic member 11a for protecting the inner wall can be easily attached by, for example, a bolt 13 inserted from the outer wall of the pulverized coal supply pipe 1, and the ceramic member 11b for protecting the outer wall can be attached by connecting its tip to an air supply. This can be easily done by fixing the tube 2 to a fixing seat 14 formed protruding from a part of the outer wall 4, and fixing the rear end with a fixing piece 15 inserted from the rear of the burner B. Incidentally, when the ceramic members 11a, 11b are to be removed for repair or inspection, this can be easily done by removing the bolts 13 and fixing pieces 15.
上記のように内壁保護用セラミツク部材１１ａ
及び外壁保護用セラミツク部材１１ｂを装着する
ことによつて、輸送管７内を供給されてくる微粉
炭は、混合流体供給口１０近傍のセラミツク部材
１１ａ，１１ｂに当たるため、バーナＢの摩耗を
防止することができる。例えば、上記セラミツク
部材１１ａ，１１ｂとして、アルミナ純度99％、
肉厚10mmのものを使用した場合には、該部分での
連続使用は約20000時間が可能となり、従来鋼板
製のバーナをハードフエイシング加工していた場
合が約4000時間であつたのに比べて大幅の耐久時
間を向上させることができる。 As described above, the ceramic member 11a for protecting the inner wall
By installing the ceramic member 11b for protecting the outer wall, the pulverized coal supplied through the transport pipe 7 hits the ceramic members 11a and 11b near the mixed fluid supply port 10, thereby preventing wear on the burner B. be able to. For example, as the ceramic members 11a and 11b, alumina purity of 99%,
When using a burner with a wall thickness of 10 mm, continuous use at that part can be approximately 20,000 hours, compared to approximately 4,000 hours when conventional steel plate burners were hard faced. This can significantly improve durability.
一方、噴出口８近傍に取り付けられるセラミツ
ク部材１２は、前記セラミツク部材１１と同様、
更に微粉炭供給管１の内壁３に取り付けられる円
筒状の内壁保護用セラミツク部材１２ａと空気供
給管２の外壁４周面に取り付けられる円筒状の外
壁保護用セラミツク部材１２ｂとで構成される
が、微粉炭を含む混合流体の流速を上げるため
に、その中程が先端に向かつて傾斜しており、後
半部に比べて前半部の方が厚肉状に形成され、微
粉炭供給路５がノズル状に狭くなつている。また
内壁保護用セラミツク部材１２ａの前部には、空
気供給管２の外壁４との間に介装される保持部材
１６が一体成形され、微粉炭供給路５を一定幅に
保持している。 On the other hand, the ceramic member 12 attached near the spout 8 is similar to the ceramic member 11 described above.
Furthermore, it is composed of a cylindrical inner wall protecting ceramic member 12a attached to the inner wall 3 of the pulverized coal supply pipe 1 and a cylindrical outer wall protecting ceramic member 12b attached to the outer wall 4 circumferential surface of the air supply pipe 2. In order to increase the flow rate of the mixed fluid containing pulverized coal, the middle part is inclined toward the tip, and the first half is thicker than the second half, and the pulverized coal supply path 5 is connected to the nozzle. It narrows in shape. Further, a holding member 16 interposed between the inner wall protecting ceramic member 12a and the outer wall 4 of the air supply pipe 2 is integrally formed in the front part thereof, and holds the pulverized coal supply passage 5 at a constant width.
これらのセラミツク部材１２ａ，１２ｂは、バ
ーナＢの噴出口８側から夫々挿入され、後端部を
内壁３および外壁４に形成した係止段部１７，１
８に係止した状態で微粉炭供給管１の外側及び空
気供給管２の内側から夫々ボルト１９，２０によ
つて壁面に密に装着される。 These ceramic members 12a, 12b are inserted from the spout 8 side of the burner B, respectively, and their rear ends are connected to locking step portions 17, 1 formed on the inner wall 3 and outer wall 4, respectively.
8, it is tightly attached to a wall surface from the outside of the pulverized coal supply pipe 1 and the inside of the air supply pipe 2 by bolts 19 and 20, respectively.
このようにバーナＢの先端部近傍に内壁保護用
セラミツク部材１２ａ及び外壁保護用セラミツク
部材１２ｂを装着することによつて、微粉炭供給
路５内を移動してくる混合流体は、該セラミツク
部材１２ａ，１２ｂに激しく当たるが、これらセ
ラミツク部材１２ａ，１２ｂが耐摩耗性であるた
めその摩耗が少ない。また火炎の輻射熱の影響に
よる材質の劣化もセラミツク部材１２ａ，１２ｂ
の高耐熱性によつて防止できる。例えば、上記セ
ラミツク部材１２ａ，１２ｂとしてアルミナ純度
99％、前部の厚肉部の肉厚15mmのものを使用した
場合には、該部分における連続使用時間が約
16000時間となり、また上記セラミツクより硬度
が高い炭化珪素セラミツク（肉厚10mm）を使用し
た場合には約20000時間の連続使用が可能となり、
従来ハードフエイシング加工していた場合が約
4000時間であつたのに比べて大幅に耐久時間を向
上させることができる。 By installing the ceramic member 12a for protecting the inner wall and the ceramic member 12b for protecting the outer wall near the tip of the burner B in this way, the mixed fluid moving in the pulverized coal supply path 5 can be transferred to the ceramic member 12a. , 12b, but since these ceramic members 12a, 12b are wear resistant, there is little wear. In addition, deterioration of the material due to the influence of radiant heat of the flame can also occur in the ceramic members 12a and 12b.
This can be prevented by its high heat resistance. For example, the ceramic members 12a and 12b may be made of alumina purity.
99%, when using a front thick part with a wall thickness of 15 mm, the continuous use time in that part is approx.
16,000 hours, and if silicon carbide ceramic (wall thickness 10 mm), which is harder than the above ceramics, is used, it can be used continuously for about 20,000 hours.
If conventional hard facing processing was used, approximately
The durability can be significantly improved compared to the previous 4000 hours.
尚、上記セラミツク部材１２ａ，１２ｂを補
修、又は点検のためバーナＢから離脱する場合に
は、固定ボルト１９，２０をはずすことによつて
容易に行うことができる。 Incidentally, when the ceramic members 12a, 12b are removed from the burner B for repair or inspection, this can be easily done by removing the fixing bolts 19, 20.
第７図及び第８図は本発明に係る微粉炭燃焼バ
ーナの先端部の他の実施例を示したものであり、
バーナＢの先端部に微粉炭供給管１及び空気供給
管２と略同一径の円筒状セラミツク部材２１ａ，
２１ｂを夫々取り付けたものである。これらの円
筒状セラミツク部材２１ａ，２１ｂは、前記実施
例と同様、外側円筒状セラミツク部材２１ａの前
半部及び内側円筒状セラミツク部材２１ｂの前半
部が夫々対向する面に向かつて厚肉状に形成さ
れ、バーナＢの微粉炭供給路５の径よりも幅狭に
形成される。また外側円筒状セラミツク部材２１
ａの後端部円周上には外側に張り出したフランジ
部２２が、内側円筒状セラミツク部材２１ｂの後
端部円周上には内側に張り出したフランジ部２３
が夫々形成され、これらフランジ部２２，２３に
対応して設けられたバーナＢ先端のフランジ部２
４，２５に当接させた状態でボルト２６，２７で
両者を固定する。尚、微粉炭供給路５を一定幅に
保持するための保持部材１６は前記実施例と同
様、外側円筒状セラミツク部材２１ａの内壁円周
上の３箇所に形成されている。 7 and 8 show other embodiments of the tip of the pulverized coal combustion burner according to the present invention,
A cylindrical ceramic member 21a having approximately the same diameter as the pulverized coal supply pipe 1 and the air supply pipe 2 is attached to the tip of the burner B.
21b are attached respectively. These cylindrical ceramic members 21a, 21b are formed thick so that the front half of the outer cylindrical ceramic member 21a and the front half of the inner cylindrical ceramic member 21b face opposing surfaces, respectively, as in the previous embodiment. , is formed narrower than the diameter of the pulverized coal supply path 5 of burner B. Also, the outer cylindrical ceramic member 21
A flange portion 22 protrudes outward on the circumference of the rear end of a, and a flange portion 23 protrudes inward on the circumference of the rear end of the inner cylindrical ceramic member 21b.
are formed respectively, and a flange portion 2 at the tip of burner B is provided corresponding to these flange portions 22 and 23.
4 and 25, and fix both with bolts 26 and 27. The holding members 16 for holding the pulverized coal supply path 5 at a constant width are formed at three locations on the circumference of the inner wall of the outer cylindrical ceramic member 21a, as in the previous embodiment.
この実施例におけるバーナＢは、炉内に挿入さ
れたセラミツク部材２１ａ，２１ｂが熱衝撃の影
響を大きく受けるので、上記アルミナセラミツク
又は炭化硅素セラミツクより耐熱衝撃性に優れる
窒化硅素セラミツクを使用するのが望ましく、こ
れによつて高温炉内における熱変形を受けにく
く、また炉内中で飛散する粉体物による摩耗を受
けにくい。例えば、上記窒化硅素セラミツクを使
用し、外側円筒状セラミツク部材２１ａの厚肉部
を10mm、内側円筒状セラミツク部材２１ｂの厚肉
部を15mmとした場合、バーナＢの連続使用時間は
約16000時間となり、従来のようにハードフイシ
ング加工していたバーナの連続使用時間が約4000
時間であつたのに比べて大幅に耐久時間を向上す
ることができる。 In the burner B of this embodiment, since the ceramic members 21a and 21b inserted into the furnace are greatly affected by thermal shock, it is preferable to use silicon nitride ceramic, which has better thermal shock resistance than the alumina ceramic or silicon carbide ceramic. Desirably, this makes it less susceptible to thermal deformation in a high-temperature furnace and less susceptible to wear due to powder particles flying around in the furnace. For example, if the above silicon nitride ceramic is used and the thick part of the outer cylindrical ceramic member 21a is 10 mm and the thick part of the inner cylindrical ceramic member 21b is 15 mm, the continuous use time of burner B will be approximately 16,000 hours. , the continuous use time of the conventional hard-finished burner is approximately 4000.
Durability can be significantly improved compared to the time required.
尚、本発明で使用されるセラミツクは、上記実
施例の種類のものに限定されるものではなく、耐
摩耗性、耐熱性の良いセラミツクであれば使用で
きる。 Incidentally, the ceramic used in the present invention is not limited to the type described in the above embodiments, but any ceramic having good wear resistance and heat resistance can be used.
以上説明したように本発明に係る微粉炭燃焼バ
ーナによれば、微粉炭供給路には微粉炭の衝突に
よつて摩耗を受け易い輸送管の接続部近傍および
微粉炭供給路の噴出口部分のそれぞれに耐摩耗性
セラミツク部材を設けたから、微粉炭の激しい衝
突によるバーナの摩耗を防止することができバー
ナの耐久性が向上すると共に、噴出口の口径が摩
耗で広がつてしまうこともないので微粉炭の噴出
速度が低下せず、所定の燃焼効率を確保すること
ができるといつた効果を奏する。 As explained above, according to the pulverized coal combustion burner according to the present invention, the pulverized coal supply path includes the vicinity of the connection part of the transport pipe that is susceptible to wear due to the collision of pulverized coal, and the ejection port part of the pulverized coal supply path. Since each part is equipped with a wear-resistant ceramic member, it is possible to prevent the burner from being worn out due to the violent collision of pulverized coal, improving the durability of the burner, and also preventing the diameter of the jet nozzle from widening due to wear. The effect is that the ejection speed of pulverized coal does not decrease and a predetermined combustion efficiency can be ensured.
また特に高温を受け易い部分には、耐熱性セラ
ミツク部材を用いることによつて熱の影響を少な
くすることができる。 Furthermore, by using heat-resistant ceramic members in parts that are particularly susceptible to high temperatures, the effects of heat can be reduced.
更にセラミツク部材は着脱可能に装着されるの
で、点検又は補修を容易に行なうことができる等
の効果を奏する。 Furthermore, since the ceramic member is removably mounted, inspection and repair can be easily performed.
第１図は従来の微粉炭燃焼バーナの一例を示す
断面説明図、第２図は輸送管近傍の平面図、第３
図は第１図中−線断面説明図、第４図は本発
明に係る微粉炭燃焼バーナの一実施例を示す断面
説明図、第５図は第４図中−線断面図、第６
図は第４図中−線断面図、第７図は微粉炭燃
焼バーナ先端部の他の実施例を示す断面説明図、
第８図は第７図中−線断面説明図である。
１……微粉炭供給管、２……空気供給管、３…
…内壁、４……外壁、５……微粉炭供給路、８…
…噴出口、１０……混合流体供給口、１１，１２
……セラミツク部材、１６……保持部材、２１
ａ，２１ｂ……円筒状セラミツク部材、２４，２
５……フランジ部。
Fig. 1 is a cross-sectional explanatory diagram showing an example of a conventional pulverized coal combustion burner, Fig. 2 is a plan view near the transport pipe, and Fig. 3 is a plan view of the vicinity of the transport pipe.
The figures are an explanatory cross-sectional view taken along the line in FIG. 1, FIG.
The figure is a sectional view taken along the line in FIG.
FIG. 8 is an explanatory cross-sectional view taken along the line -- in FIG. 7. 1...Pulverized coal supply pipe, 2...Air supply pipe, 3...
...Inner wall, 4...Outer wall, 5...Pulverized coal supply path, 8...
...Spout port, 10...Mixed fluid supply port, 11, 12
... Ceramic member, 16 ... Holding member, 21
a, 21b... Cylindrical ceramic member, 24, 2
5...Flange part.
Claims (1)
されて２重管構造をなし、外側の微粉炭供給管１
の内壁３と内側の空気供給管２の外壁４との間に
は微粉炭供給路５が形成され、微粉炭供給路５の
後部には微粉炭を送り込むための輸送管７が接続
されると共に、微粉炭供給路５の先端部に設けら
れた噴出口８が微粉炭供給路５の他の部分より幅
狭に形成されてなる微粉炭燃焼バーナにおいて、 上記微粉炭供給路５の内周面には輸送管７が接
続される微粉炭供給路５の混合流体供給口１０の
近傍および微粉炭供給路５の噴出口８部分のそれ
ぞれにセラミツク部材１１ａ，１１ｂ，１２ａ，
１２ｂ，２１ａ，２１ｂが取付けられたことを特
徴とする微粉炭燃焼バーナ。[Claims] 1. An air supply pipe 2 is disposed inside the pulverized coal supply pipe 1 to form a double pipe structure, and the pulverized coal supply pipe 1 is located outside the pulverized coal supply pipe 1.
A pulverized coal supply channel 5 is formed between the inner wall 3 of the inner wall 3 and the outer wall 4 of the inner air supply pipe 2, and a transport pipe 7 for feeding the pulverized coal is connected to the rear of the pulverized coal supply channel 5. , in a pulverized coal combustion burner in which a spout 8 provided at the tip of the pulverized coal supply path 5 is formed narrower than other parts of the pulverized coal supply path 5, the inner circumferential surface of the pulverized coal supply path 5 is Ceramic members 11a, 11b, 12a,
A pulverized coal combustion burner characterized in that 12b, 21a, and 21b are attached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10885781A JPS5811308A (en) | 1981-07-14 | 1981-07-14 | Pulverized coal combustion burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10885781A JPS5811308A (en) | 1981-07-14 | 1981-07-14 | Pulverized coal combustion burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5811308A JPS5811308A (en) | 1983-01-22 |
| JPH0222288B2 true JPH0222288B2 (en) | 1990-05-18 |
Family
ID=14495350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10885781A Granted JPS5811308A (en) | 1981-07-14 | 1981-07-14 | Pulverized coal combustion burner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5811308A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59175825U (en) * | 1983-05-10 | 1984-11-24 | バブコツク日立株式会社 | burner impeller |
| JPS6043807U (en) * | 1983-09-05 | 1985-03-28 | バブコツク日立株式会社 | Pulverized coal combustion equipment |
| DE4311457A1 (en) * | 1993-04-08 | 1994-10-13 | Kloeckner Humboldt Deutz Ag | Rotary kiln burner for fine-grained solid fuel |
| DE10201558A1 (en) | 2001-01-18 | 2002-08-14 | Alstom Power Boiler Gmbh | Burner for particulate fuel introduces primary air and secondary air through different tubes with flow stabilising area upstream in flow direction of primary mixture |
| JP6632776B1 (en) * | 2018-05-17 | 2020-01-22 | 三菱日立パワーシステムズ株式会社 | Support sleeve protection member and solid fuel burner provided with the same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2908448C2 (en) * | 1979-03-05 | 1983-04-14 | L. & C. Steinmüller GmbH, 5270 Gummersbach | Burners for burning nitrogenous fuels |
| DE2933060C2 (en) * | 1979-08-16 | 1987-01-22 | L. & C. Steinmüller GmbH, 5270 Gummersbach | Burners for the combustion of dust-like fuels |
-
1981
- 1981-07-14 JP JP10885781A patent/JPS5811308A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5811308A (en) | 1983-01-22 |
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