JP3524692B2 - Coal feeder - Google Patents
Coal feederInfo
- Publication number
- JP3524692B2 JP3524692B2 JP22114396A JP22114396A JP3524692B2 JP 3524692 B2 JP3524692 B2 JP 3524692B2 JP 22114396 A JP22114396 A JP 22114396A JP 22114396 A JP22114396 A JP 22114396A JP 3524692 B2 JP3524692 B2 JP 3524692B2
- Authority
- JP
- Japan
- Prior art keywords
- coal
- feed pipe
- coal feed
- pipe
- coarse
- 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 - Fee Related
Links
Landscapes
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、加圧流動床ボイラ
（ＰＦＢＣ）などに適用される給炭管に関する。
【０００２】
【従来の技術】図３は加圧流動床ボイラ（ＰＦＢＣ）な
どに使用されている従来の給炭管の説明図である。図に
おいて、給炭機１から落下する石炭はコンベア３により
給炭管４へ送られて下方のミルへ落下する。また、図示
しない粗粒炭の分離器から粗粒炭を戻す戻り管５が上方
から給炭管４に変形Ｙ字型に連結されており、粗粒炭と
石炭とが合流する構造になっている。
【０００３】
【発明が解決しようとする課題】上記のような従来の給
炭管においては、上方から給炭管４の途中に接続されて
いる戻り管５から落下する粗粒炭が給炭管４正面の内壁
に衝突して付着する。この付着する粗粒炭が除々に成長
し続けると、最終的には給炭管４が閉塞してミルへの給
炭ができなくなることがある。こうなると、加圧流動床
ボイラに燃料が供給されなくなって最悪の場合はプラン
トの運転が停止するなどの不具合がある。
【０００４】
【課題を解決するための手段】本発明に係る給炭管は上
記課題の解決を目的にしており、略垂直に設けられ内部
を石炭が落下するとともに、途中の管壁に粗粒炭を合流
させる複数の戻り管が上方から略Ｙ字状に接続される給
炭管において、複数の上記戻り管を途中の管壁に対して
鋭角をなし接線方向に互いに点対称に設けるものであ
る。
【０００５】上記のように複数の粗粒炭の戻り管が給炭
管に鋭角をなし接線方向に互いに点対称に設けているこ
とにより、粗粒炭が給炭管の内壁に付着し難くなるとと
もに、粗粒炭が熱空気とともに給炭管内に旋回流を作
り、この旋回流により粗粒炭が給炭管の内壁に付着しな
くなって下方へスムーズに落下する。
【０００６】
【発明の実施の形態】図１は本発明の実施の一形態に係
る給炭管の説明図、図２は本発明の実施の他の形態に係
る給炭管の説明図である。図において、これらの実施の
形態に係る給炭管は加圧流動床ボイラ（ＰＦＢＣ）など
に適用されるもので、図に示すように給炭機１から落下
する石炭はコンベア３により給炭管４へ送られて下方の
ミルへ落下する。また、図示しない粗粒炭の分離器から
粗粒炭を戻す戻り管５が上方から給炭管４に変形Ｙ字型
に連結されており、粗粒炭と石炭とが合流する構造にな
っている。
【０００７】図１において、本実施の形態に係る給炭管
は図に示すように給炭機からミルへ石炭を搬送する給炭
管４途中の戻り管５が接続されている近傍に、圧力をか
けた空気を吹き込み穴１０から一定のインターバルでス
プレーして給炭管４の内壁に付着する粗粒炭を除去する
ことができるようになっており、１５秒間に１回の割合
で圧力３kg/cm2の圧縮空気が吹き込まれる。この圧縮空
気は圧力調整弁７により圧力を調整することができる。
図における符号８は圧縮空気のバルブ、９は圧縮空気の
送り管である。
【０００８】給炭機から落下する石炭は、コンベアによ
り給炭管４に運ばれ、給炭管４により下方のミルへ供給
される。また、戻り管５を通って落下する粗粒炭は、給
炭管４内を搬送される石炭と合流するが、圧力調整弁７
を介して吹き込み穴１０から噴出する圧縮空気により吹
き飛ばされ、給炭管４の内壁に付着することなく下方の
ミルへ落下する。
【０００９】図２において、本実施の形態に係る給炭管
は図に示すように給炭機１からミルへ通ずる給炭管４の
途中に複数本の粗粒炭の戻り管５が接続されている。こ
の接続される角度が鋭角をなすとともに複数本の戻り管
５が給炭管４の接線方向に互いに点対称に設けられてお
り、給炭管４の円周方向に旋回流を発生させ、戻り管５
内を落下して合流する粗粒炭が給炭管４の内壁に付着し
ないようになっている。給炭管４と戻り管５とがなす角
度は、３０度程度の鋭角になっている。なお、鋭角が３
０度を超えると給炭管４と戻り管５との接続が困難にな
る。
【００１０】給炭機１から落下する石炭はコンベア３に
より給炭管４へ運搬され、給炭管４を通って下方のミル
へ供給される。また、戻り管５を通って落下する粗粒炭
は戻り管５と給炭管４との接続角が小さいことにより給
炭管４の内壁に付着し難く、また複数本の戻り管５が給
炭管４に互いに点対称に接線方向に接続されていること
により戻り管５を通って給炭管４に入る粗粒炭の粉体が
熱空気と一緒に給炭管４内に旋回流を作り、粗粒炭の壁
面への付着を防止する。
【００１１】従来の給炭管においては、上方から給炭管
の途中に接続されている戻り管から落下する粗粒炭が給
炭管正面の内壁に衝突して付着する。この付着する粗粒
炭が除々に成長し続けると、最終的には給炭管が閉塞し
てミルへの給炭ができなくなることがある。こうなる
と、加圧流動床ボイラに燃料が供給されなくなって最悪
の場合はプラントの運転が停止するなどの不具合がある
が、上述の各実施の形態に係る給炭管においては、給炭
管４と粗粒炭の戻り管５とが互いに接続される同一レベ
ル付近の給炭管４の周壁に圧縮された空気の吹き込み穴
１０を穿け、この吹き込み穴１０から圧縮空気を圧力調
整弁７を介して給炭管４の内部に定期的に吹き込む、或
いは従来の給炭管においては１本のみ設けられている粗
粒炭の戻り管を、給炭管４に接続する角度を鋭角にして
複数本の戻り管５を給炭管４の同一の円周方向に接続し
ており、圧縮空気が給炭管４に穿けられている吹き込み
穴１０から圧力調整弁７を介して定期的に給炭管４内へ
吹き込まれることにより、吹き込まれた圧縮空気が戻り
管５内を落下して合流する粗粒炭に衝突して粗粒炭が内
壁に付着せず、管壁に付着している粗粒炭は吹き飛ばさ
れて給炭管４内をスムーズに落下し、下方のミルへ供給
される。また、給炭管４に戻り管５が鋭角をなして接続
されていることにより粗粒炭が給炭管４の壁面に付着せ
ず、また複数本の粗粒炭の戻り管５が給炭管４に同一の
円周方向に接続されていることにより戻り管５内を落下
して合流する粗粒炭が熱空気とともに給炭管４内に旋回
流を作って粗粒炭が給炭管４の内壁面に付着し難くな
り、給炭管４内をスムーズに落下して下方のミルへ供給
される。これらにより、燃料の供給が継続されて加圧流
動床ボイラなどにおける安定した運転が可能となる。
【００１２】
【発明の効果】本発明に係る給炭管は前記のように構成
されており、粗粒炭が給炭管の内壁に付着しなくなって
下方へスムーズに落下するので、石炭の供給が常に安定
して行われる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coal feed pipe applied to a pressurized fluidized bed boiler (PFBC) or the like. FIG. 3 is an explanatory view of a conventional coal feed pipe used in a pressurized fluidized bed boiler (PFBC) or the like. In the figure, coal falling from a coal feeder 1 is sent to a coal feed pipe 4 by a conveyor 3 and falls into a lower mill. Further, a return pipe 5 for returning coarse coal from a coarse coal separator (not shown) is connected to the coal feed pipe 4 from above in a modified Y-shape, so that the coarse coal and coal coalesce. I have. [0003] In the conventional coal feed pipe as described above, the coarse coal falling from the return pipe 5 connected in the middle of the coal feed pipe 4 from above is subjected to the coal feed pipe. 4 Collide and adhere to the inner wall in front. If the attached coarse coal continues to grow gradually, the coal feed pipe 4 may eventually be clogged and the coal cannot be supplied to the mill. In such a case, fuel is not supplied to the pressurized fluidized-bed boiler, and in the worst case, there is a problem that the operation of the plant is stopped. [0004] A coal feed pipe according to the present invention has an object to solve the above-mentioned problem. The coal feed pipe is provided substantially vertically, and coal falls down inside the pipe, and coarse particles are formed on the pipe wall on the way. joined the charcoal
Oite the coal feed pipe in which a plurality of return pipes to is connected to a substantially Y-shape from above, for a plurality of the return pipe in the middle of the tube wall
They are provided at an acute angle and are symmetrical with respect to each other in the tangential direction.
You. As described above , since the plurality of coarse coal return pipes are provided at acute angles to the coal feed pipe and are provided symmetrically with respect to each other in the tangential direction, the coarse coal does not easily adhere to the inner wall of the coal feed pipe. At the same time, the coarse coal forms a swirl flow in the coal feed pipe together with the hot air, and due to the swirl flow, the coarse coal does not adhere to the inner wall of the coal feed pipe and falls smoothly downward. FIG. 1 is an explanatory view of a coal feed pipe according to one embodiment of the present invention, and FIG. 2 is an explanatory view of a coal feed pipe according to another embodiment of the present invention. . In the drawing, the coal feed pipe according to these embodiments is applied to a pressurized fluidized bed boiler (PFBC) or the like, and as shown in FIG. It is sent to 4 and falls to the mill below. Further, a return pipe 5 for returning coarse coal from a coarse coal separator (not shown) is connected to the coal feed pipe 4 from above in a modified Y-shape, so that the coarse coal and coal coalesce. I have. In FIG. 1, a coal feed pipe according to the present embodiment has a pressure near a return pipe 5 in the middle of a feed pipe 4 for transferring coal from a coal feeder to a mill. The sprayed air is sprayed at regular intervals from the blowing hole 10 to remove the coarse coal adhering to the inner wall of the coal feed pipe 4, and the pressure is 3 kg once every 15 seconds. / cm 2 compressed air is blown. The pressure of the compressed air can be adjusted by the pressure adjusting valve 7.
In the figure, reference numeral 8 denotes a valve for compressed air, and 9 denotes a feed pipe for compressed air. [0008] Coal falling from the coal feeder is conveyed to a coal feed pipe 4 by a conveyor, and supplied to a lower mill by the coal feed pipe 4. The coarse coal falling through the return pipe 5 joins with the coal conveyed in the coal feed pipe 4,
And blown off by the compressed air spouted from the blow-in hole 10, and fall to the lower mill without adhering to the inner wall of the coal feed pipe 4. In FIG. 2, a coal feed pipe according to the present embodiment has a plurality of coarse coal return pipes 5 connected in the middle of a feed pipe 4 leading from a coal feeder 1 to a mill as shown in the figure. ing. The connection angle is an acute angle, and a plurality of return pipes 5 are provided symmetrically with respect to each other in the tangential direction of the coal feed pipe 4 to generate a swirling flow in the circumferential direction of the coal feed pipe 4 and return. Tube 5
Coarse-grained coal that falls down and joins does not adhere to the inner wall of the coal feed pipe 4. The angle formed by the coal feed pipe 4 and the return pipe 5 is an acute angle of about 30 degrees. Note that the acute angle is 3
If it exceeds 0 degrees, it becomes difficult to connect the coal feed pipe 4 and the return pipe 5. [0010] The coal falling from the coal feeder 1 is conveyed to a coal feed pipe 4 by a conveyor 3 and supplied to a lower mill through the coal feed pipe 4. Further, the coarse coal falling through the return pipe 5 is less likely to adhere to the inner wall of the coal feed pipe 4 due to a small connection angle between the return pipe 5 and the coal feed pipe 4. By being tangentially connected to the coal pipe 4 symmetrically with respect to each other, the coarse coal powder entering the coal feed pipe 4 through the return pipe 5 forms a swirl flow into the coal feed pipe 4 together with hot air. To prevent coarse coal from adhering to the wall. In a conventional coal feed pipe, coarse coal falling from a return pipe connected in the middle of the coal feed pipe from above collides with and adheres to the inner wall in front of the coal feed pipe. If the attached coarse coal continues to grow gradually, the coal feed pipe may eventually be clogged and the coal cannot be supplied to the mill. In this case, the fuel is not supplied to the pressurized fluidized-bed boiler, and in the worst case, there is a problem that the operation of the plant is stopped. However, in the coal feed pipe according to each of the above-described embodiments, the coal feed pipe 4 And a return pipe 5 of coarse coal are connected to each other. A compressed air blowing hole 10 is formed in the peripheral wall of the coal feeding pipe 4 near the same level, and compressed air is supplied from the blowing hole 10 through the pressure regulating valve 7. Or a plurality of return pipes of coarse coal which are provided only once in a conventional coal feed pipe are connected to the coal feed pipe 4 at an acute angle. Return pipe 5 is connected in the same circumferential direction of the coal feed pipe 4, and compressed air is periodically supplied from a blow hole 10 formed in the coal feed pipe 4 via a pressure regulating valve 7. 4, the compressed air blown through the return pipe 5. The coarse coal that has fallen and collide with the coal does not adhere to the inner wall, and the coarse coal adhering to the pipe wall is blown off and falls down smoothly in the coal feed pipe 4, and the lower mill Supplied to Also, since the return pipe 5 is connected to the coal feed pipe 4 at an acute angle, the coarse coal does not adhere to the wall surface of the coal feed pipe 4 and the plurality of coarse coal return pipes 5 Coarse coal which drops in the return pipe 5 and joins by being connected to the pipe 4 in the same circumferential direction creates a swirl flow in the coal feed pipe 4 together with the hot air, and the coarse coal is supplied to the coal feed pipe. It hardly adheres to the inner wall surface of the coal feed pipe 4 and falls smoothly in the coal feed pipe 4 to be supplied to the lower mill. As a result, the supply of fuel is continued, and stable operation in a pressurized fluidized bed boiler or the like becomes possible. [0012] The coal feed pipe according to the present invention is constructed as described above, and coarse coal does not adhere to the inner wall of the coal feed pipe and falls smoothly downward. Is always stable.
【図面の簡単な説明】
【図１】図１（ａ）は本発明の実施の一形態に係る給炭
管の斜視図、同図（ｂ）は断面図である。
【図２】図２（ａ）は本発明の実施の他の形態に係る給
炭管の断面図、同図（ｂ）は同図（ａ）におけるＢ−Ｂ
矢視断面図である。
【図３】図３は従来の給炭管の断面図である。
【符号の説明】
１ 給炭機
３ コンベア
４ 給炭管
５ 粗粒炭の戻り管
７ 圧力調整弁
８ バルブ
９ 圧縮空気の送り管
１０ 吹き込み穴BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is a perspective view of a coal feed pipe according to an embodiment of the present invention, and FIG. 1 (b) is a sectional view. FIG. 2A is a sectional view of a coal feed pipe according to another embodiment of the present invention, and FIG. 2B is a sectional view taken along line BB in FIG.
It is arrow sectional drawing. FIG. 3 is a sectional view of a conventional coal feed pipe. [Description of Signs] 1 Coal feeder 3 Conveyor 4 Coal feed pipe 5 Coal coal return pipe 7 Pressure control valve 8 Valve 9 Compressed air feed pipe 10 Blow-off hole
フロントページの続き (56)参考文献 特開 昭60−8616（ＪＰ，Ａ) 特開 平６−24541（ＪＰ，Ａ) 特開 昭59−153720（ＪＰ，Ａ) 特開 昭61−41107（ＪＰ，Ａ) 特開 平８−121744（ＪＰ，Ａ) 特開 平９−287730（ＪＰ，Ａ) 実開 昭64−21752（ＪＰ，Ｕ) 実開 昭52−30814（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F23C 10/22 F23C 10/16 F23K 3/00 F23K 3/02 302 Continuation of front page (56) References JP-A-60-8616 (JP, A) JP-A-6-24541 (JP, A) JP-A-59-153720 (JP, A) JP-A-61-41107 (JP, A) JP-A-8-121744 (JP, A) JP-A-9-287730 (JP, A) Japanese Utility Model Application Laid-open No. 64-21752 (JP, U) Japanese Utility Model Application Laid-Open No. 52-30814 (JP, U) (58) Field surveyed (Int.Cl. 7 , DB name) F23C 10/22 F23C 10/16 F23K 3/00 F23K 3/02 302
Claims (1)
ともに、途中の管壁に粗粒炭を合流させる複数の戻り管
が上方から略Ｙ字状に接続される給炭管において、複数
の上記戻り管を途中の管壁に対して鋭角をなし接線方向
に互いに点対称に設けることを特徴とする給炭管。(57) [Claims 1] A plurality of return pipes, which are provided substantially vertically, are provided with coal falling inside and coalesced with coarse coal on a pipe wall on the way, and have a substantially Y-shape from above. in coal feed pipe connected, a plurality
Make the above return pipe at an acute angle to the pipe wall in the middle and tangential direction
Coal feed pipes which are provided symmetrically with respect to each other .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22114396A JP3524692B2 (en) | 1996-08-22 | 1996-08-22 | Coal feeder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22114396A JP3524692B2 (en) | 1996-08-22 | 1996-08-22 | Coal feeder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1061909A JPH1061909A (en) | 1998-03-06 |
| JP3524692B2 true JP3524692B2 (en) | 2004-05-10 |
Family
ID=16762149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22114396A Expired - Fee Related JP3524692B2 (en) | 1996-08-22 | 1996-08-22 | Coal feeder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3524692B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100648975B1 (en) * | 2006-02-21 | 2006-11-28 | (주) 하이텍코리아 | Plugging prevent apparatus of pulverizer supplying pipe |
| CN102003703B (en) * | 2010-12-29 | 2012-03-21 | 兖矿鲁南化肥厂 | Improved coal sliding tube anti-blocking structure |
| CN102032560B (en) * | 2011-01-10 | 2012-08-22 | 兖矿鲁南化肥厂 | Anti-blocking device for coal falling region of coal-fired boiler |
| CN104019457A (en) * | 2014-06-06 | 2014-09-03 | 大唐洛阳热电有限责任公司 | Coal chute with air-returning preventing device |
| CN108592076B (en) * | 2018-04-02 | 2019-06-14 | 安徽蓝天盈丰环保科技有限公司 | Injection type coal, pulverulent fuel mixer and coal dust mixed method with negative pressure regulatory function |
-
1996
- 1996-08-22 JP JP22114396A patent/JP3524692B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1061909A (en) | 1998-03-06 |
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