JPH0129364Y2 - - Google Patents
Info
- Publication number
- JPH0129364Y2 JPH0129364Y2 JP6976484U JP6976484U JPH0129364Y2 JP H0129364 Y2 JPH0129364 Y2 JP H0129364Y2 JP 6976484 U JP6976484 U JP 6976484U JP 6976484 U JP6976484 U JP 6976484U JP H0129364 Y2 JPH0129364 Y2 JP H0129364Y2
- Authority
- JP
- Japan
- Prior art keywords
- pulverized coal
- combustor
- combustion
- main
- burner
- 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
- 239000003245 coal Substances 0.000 claims description 31
- 238000002485 combustion reaction Methods 0.000 claims description 29
- 239000002893 slag Substances 0.000 description 12
- 239000007800 oxidant agent Substances 0.000 description 7
- 230000001133 acceleration Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007704 transition Effects 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、加熱炉やボイラ等の分野において、
燃料として微粉炭を用いる燃焼装置に関する。[Detailed description of the invention] Industrial application field This invention can be used in the field of heating furnaces, boilers, etc.
This invention relates to a combustion device that uses pulverized coal as fuel.
従来の技術
燃焼器内で石炭中の残渣すなわちスラグを除去
するようにしたサイクロン形燃焼器は公知であ
る。第３図は従来のサイクロン形燃焼器を備えた
微粉炭燃焼装置を示したものである。この図にお
いて、１は耐火壁又は水冷壁構造により円筒状に
形成された燃焼器本体、２は後流側へ燃焼ガスを
排出する燃焼器出口、３は空気又は酸素等燃料の
酸化剤を供給する主旋回ノズルで、燃焼器本体１
横断面の内壁と切線方向に必要数配設されてい
る。４は酸化剤の一部を投入するアシストスワ
ラ、５は微粉炭を噴射する燃焼器本体１の頭部軸
心に挿入された主燃バーナである。また、６は主
燃バーナ５へ微粉炭を気流搬送によつて供給する
母管、７は微粉炭ベツセル、８は燃焼器本体１の
後部絞り壁部に設けたスラグタツプである。BACKGROUND OF THE INVENTION Cyclone type combustors are known in which residues or slag in the coal is removed within the combustor. FIG. 3 shows a pulverized coal combustion apparatus equipped with a conventional cyclone type combustor. In this figure, 1 is a combustor main body formed into a cylindrical shape with a fireproof wall or water-cooled wall structure, 2 is a combustor outlet that discharges combustion gas to the downstream side, and 3 is a supply of an oxidizing agent such as air or oxygen as a fuel. The combustor body 1 is
The required number is arranged in the direction of the inner wall and the tangential line of the cross section. Reference numeral 4 represents an assist swirler that injects a portion of the oxidizing agent, and 5 represents a main combustion burner inserted into the head axis of the combustor main body 1 that injects pulverized coal. Further, 6 is a main pipe that supplies pulverized coal to the main combustion burner 5 by air conveyance, 7 is a pulverized coal vessel, and 8 is a slag tap provided on the rear throttle wall of the combustor body 1.
微粉炭ベツセル７には管９から微粉炭が供給さ
れ、母管６側へと落下する。母管６には不活性ガ
ス１０が導入されており、この不活性ガスによる
気流搬送によつて微粉炭が主燃バーナ５から燃焼
器本体１内へ噴射される。また、主旋回ノズル３
及びアシストスワラ４には酸化剤が供給されてお
り、この酸化剤は燃焼器本体１の周方向内壁に沿
つて流入する。 Pulverized coal is supplied to the pulverized coal vessel 7 from a pipe 9 and falls toward the main pipe 6 side. An inert gas 10 is introduced into the main pipe 6, and pulverized coal is injected into the combustor main body 1 from the main combustion burner 5 by air flow conveyed by this inert gas. In addition, the main rotating nozzle 3
An oxidizing agent is supplied to the assist swirler 4 , and this oxidizing agent flows along the circumferential inner wall of the combustor main body 1 .
そこで、燃焼器本体１内へ流入した酸化剤は燃
焼器内で強烈な旋回流ないしは渦流を形成する。
この旋回渦の旋回速度Ｕは第４図に示す如く、自
然渦の法則即ちU′R0・U0／R′に従う領域(a)が
生じ、この渦の中に回転気柱（渦の目）を生じ固
体棒と同じような回転をする強制渦領域(b)に分
れ、自然渦と強制渦の遷移域に円筒状の流れの境
界層１１を形成することは既に周知のことであ
る。 Therefore, the oxidizing agent that has flowed into the combustor main body 1 forms an intense swirling flow or vortex flow within the combustor.
As shown in Fig. 4, the swirling speed U of this swirling vortex creates a region (a) that follows the law of natural vortices, that is, U'R 0・U 0 /R', and within this vortex there is a rotating air column (the eye of the vortex). ) and is divided into a forced vortex region (b) that rotates like a solid rod, and it is already well known that a cylindrical flow boundary layer 11 is formed in the transition region between the natural vortex and the forced vortex. .
こゝにU0＝旋回噴口出口における気流の旋回
速度、R0＝燃焼筒半径、R′＝任意の点における
半径、U′＝任意の半径R′における気流の旋回速
度である。 Here, U 0 = swirling speed of the airflow at the outlet of the swirling nozzle, R 0 = radius of the combustion cylinder, R' = radius at an arbitrary point, and U' = swirling velocity of the airflow at an arbitrary radius R'.
従来技術の問題点
こゝで旋回渦の気流（酸化剤）中に噴射された
石炭微粒子は、旋回気流に乗つて流れ、酸化剤と
の混合が効果的に行われ燃焼反応が促進されるも
のであるが、燃焼反応を起し乍ら飛しようする石
炭微粒子は気流渦での燃焼反応による熱ピツチ作
用によつて渦流の境界層１１内に塞じ込められ
る。従つて火炎の自然渦領域への拡散が阻害さ
れ、燃焼反応によつて生じた石炭スラグの溶融ミ
ストが燃焼火炎の流れに同伴されて燃焼排ガス中
へのキヤリオーバーを生じること、及び強制渦流
の遠心力作用によつて周壁部へ飛出し壁面へ沈着
したスラグミスト１２は過冷され壁面への付着堆
積を生じ、燃焼器本体１の内壁面を沿つて流れる
溶融スラグの流れが阻害されスラグの分離排出機
能が低下する欠点があつた。１３はスラグタツプ
８から排出される排出スラグ、１４は燃焼火炎で
ある。Problems with the conventional technology Here, the coal particles injected into the swirling vortex airflow (oxidizing agent) flow along with the swirling airflow, effectively mixing with the oxidizing agent and promoting the combustion reaction. However, the coal particles that fly away during the combustion reaction are trapped within the boundary layer 11 of the vortex due to the thermal pitch effect caused by the combustion reaction in the air vortex. Therefore, the diffusion of the flame into the natural vortex region is inhibited, and the molten mist of coal slag produced by the combustion reaction is entrained in the flow of the combustion flame and carries over into the combustion exhaust gas, and the forced vortex flow The slag mist 12 that flies out to the peripheral wall due to the centrifugal force and deposits on the wall surface is supercooled and deposits on the wall surface, and the flow of molten slag flowing along the inner wall surface of the combustor body 1 is obstructed. The drawback was that the separation and discharge function deteriorated. 13 is discharged slag discharged from the slag tap 8, and 14 is a combustion flame.
考案の目的
本考案は、微粉炭を燃料とする燃焼装置におい
て、燃焼器本体でのスラグの除去性能を高め、熱
交換器や蒸気発生器等の後流機器でのスラグの付
着、堆積による障害を防止し、プラントの性能や
信頼性を高めることを目的としたものである。Purpose of the invention This invention improves the slag removal performance in the combustor body in combustion equipment that uses pulverized coal as fuel, and prevents problems caused by slag adhesion and accumulation in downstream equipment such as heat exchangers and steam generators. The purpose is to prevent this and improve plant performance and reliability.
問題点を解決するための手段
従来の問題点を解決するため本考案では、主燃
焼バーナの近傍に補助ジツトバーナを設け、夫々
から異なつた噴出速度で微粉炭を噴出させる構成
としている。Means for Solving the Problems In order to solve the problems of the conventional method, the present invention has a configuration in which auxiliary jet burners are provided near the main combustion burner, and pulverized coal is jetted from each burner at different jetting speeds.
実施例
以下本考案に係る微粉炭燃焼装置の一実施例を
第１図及び第２図を参照して詳細に説明する。尚
第１図において第３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
ものとする。Embodiment An embodiment of the pulverized coal combustion apparatus according to the present invention will be described in detail below with reference to FIGS. 1 and 2. Note that in FIG. 1, the same parts as in FIG. 3 are designated by the same reference numerals, so the explanation of those parts will be omitted.
さて、第１図において２１は燃焼器本体１の主
燃バーナ５及びアシストスワラ４の外周部に設け
た高速ジエツトバーナである。この高速ジエツト
バーナ２１は、第２図に示すようにこの実施例で
は２個配設してあるが、１個でも又は２個以上で
あつてもよい。高速ジエツトバーナ２１には管２
２を介して加速インジエクタ２３が連結されてい
る。この加速インジエクタ２３は母管６に設けた
分岐管２４に結合されていて、高圧空気２５が供
給されるようになつている。なおこの実施例で
は、微粉炭ベツセル７の下部から不活性ガス２６
を吹き込んで、母管６側へ微粉炭を供給するよう
にしている。しかし第３図に示した従来のやり方
でも差支えはない。 Now, in FIG. 1, reference numeral 21 denotes a high-speed jet burner provided on the outer periphery of the main combustion burner 5 and the assist swirler 4 of the combustor main body 1. Although two high-speed jet burners 21 are provided in this embodiment as shown in FIG. 2, they may be one or two or more. The high speed jet burner 21 has a pipe 2.
An acceleration injector 23 is connected via 2. This acceleration injector 23 is connected to a branch pipe 24 provided in the main pipe 6, and is supplied with high pressure air 25. In this embodiment, an inert gas 26 is supplied from the bottom of the pulverized coal vessel 7.
is blown to supply pulverized coal to the main pipe 6 side. However, there is no problem with the conventional method shown in FIG.
次に作用を説明する。 Next, the action will be explained.
微粉炭ベツセル７の下部から吹込まれた不活性
ガス２６によつて微粉炭は流動化され、上方の取
出し口から搬送用のN2ガス１０によつて母管６
内へ圧送され、希釈されて主燃バーナ５の先端か
ら燃焼器本体１内へ噴射拡散される。この主燃バ
ーナ５から噴射される微粉炭と搬送気体との混合
流の噴出速度は、数10m／ｓ〜10m／ｓ程度であ
る。 The pulverized coal is fluidized by an inert gas 26 blown from the lower part of the pulverized coal vessel 7, and transferred to the main tube 6 by N2 gas 10 for conveyance from the upper outlet.
It is diluted and injected and diffused into the combustor body 1 from the tip of the main combustion burner 5. The ejection speed of the mixed flow of pulverized coal and carrier gas injected from the main combustion burner 5 is approximately several tens of m/s to 10 m/s.
一方、母管６の途中に設けた分岐管２４と連結
した加速インジエクター２３によつて、微粉炭混
合気流の一部（約10〜20％）を抽出して、これを
燃焼器本体１頭部の外周に配設した補助ジエツト
バーナ２１から燃焼器本体１内の自然渦領域へ軸
方向に噴射する。こゝで加速インジエクター２３
は、高圧空気２５をノズル部から音速で噴出し、
エゼクター効果によつて、微粉炭搬送用母管６か
ら抽出した微粉炭混合気流を加速し、デイフユザ
ー部で圧力回復による加圧を行い主流の微粉炭混
合気流よりもさらに高い圧力で補助ジエツトバー
ナ２１へ供給している。従つて補助ジエツトバー
ナ２１の先端からは微粉炭の混合気流が噴出速度
200〜300m／ｓの高速ジエツトで噴出するもので
ある。 On the other hand, an acceleration injector 23 connected to a branch pipe 24 provided in the middle of the main pipe 6 extracts a part (approximately 10 to 20%) of the pulverized coal mixture and transfers it to the head of the combustor main body. The fuel is injected in the axial direction from an auxiliary jet burner 21 disposed on the outer periphery of the combustor body 1 to a natural vortex region within the combustor body 1. Acceleration injector 23 here
blows out high-pressure air 25 from the nozzle at the speed of sound,
Due to the ejector effect, the pulverized coal mixed airflow extracted from the main pipe 6 for pulverized coal conveyance is accelerated and pressurized by pressure recovery in the diffuser section, and sent to the auxiliary jet burner 21 at a higher pressure than the mainstream pulverized coal mixed airflow. supplying. Therefore, the mixed air flow of pulverized coal is ejected from the tip of the auxiliary jet burner 21 at a high speed.
It ejects at a high speed of 200 to 300 m/s.
考案の効果
上述のように、本考案では燃焼器本体１頭部の
気流の淀み部から、燃焼器本体１内の気流の自然
渦領域にジエツト噴流を形成することにより、強
制渦中に塞じ込められた主流火炎１４の高温燃焼
ガスを自然渦中へ拡散させ、火炎気柱を自然渦域
へ拡散させるもので、この効果により燃焼器内で
の実質燃焼、ゾーンを広め高負荷燃焼が得られる
と共にスラグミストの壁面への貫通力を助け、器
壁温度境界層部のガス温度上昇と併せスラグの分
離排出効率が大巾に向上されるものである。よつ
て後流機器でのスラグの付着による障害を防止し
プラントの性能や信頼性も高めることができる。Effects of the invention As described above, in the present invention, a jet jet is formed from the stagnation part of the airflow in the head of the combustor main body 1 in the natural vortex area of the airflow in the combustor main body 1, thereby trapping it in a forced vortex. The high-temperature combustion gas of the mainstream flame 14 is diffused into the natural vortex, and the flame column is diffused into the natural vortex region.This effect allows substantial combustion within the combustor, widens the zone, and achieves high-load combustion. This helps the penetration force of the slag mist into the wall surface, increases the gas temperature in the temperature boundary layer of the vessel wall, and greatly improves the slag separation and discharge efficiency. Therefore, it is possible to prevent troubles due to slag adhesion in downstream equipment and improve the performance and reliability of the plant.
第１図は本考案に係る微粉炭燃焼装置の一実施
例を示す系統図、第２図は第１図の−線に沿
つた燃焼器本体の断面を示した図、第３図は従来
の微粉炭燃焼装置を示す系統図、第４図は第３図
の−線に沿う断面を示した図である。
１……燃焼器本体、５……主燃バーナ、６……
母管、２１……補助ジエツトバーナ、２３……加
速インジエクタ、２４……分岐管。
Fig. 1 is a system diagram showing an embodiment of the pulverized coal combustion device according to the present invention, Fig. 2 is a cross-sectional view of the combustor body taken along the - line in Fig. 1, and Fig. 3 is a diagram showing a conventional pulverized coal combustion device. A system diagram showing a pulverized coal combustion apparatus, FIG. 4 is a cross-sectional view taken along the - line in FIG. 3. 1... Combustor main body, 5... Main combustion burner, 6...
Main pipe, 21...auxiliary jet burner, 23...acceleration injector, 24...branch pipe.
Claims (1)
バーナと、この主燃バーナの近傍の前記燃焼器本
体に配設した少なくとも１個の補助ジエツトバー
ナと、前記主燃バーナへ微粉炭を気流によつて搬
送する母管と、この母管内を搬送される微粉炭を
搬送用気流とともにその一部を吸引しこれを加圧
して前記補助ジエツトバーナへ供給するインジエ
クタとを備えた微粉炭燃焼装置。 A combustor body, a main combustion burner disposed in the combustor body, at least one auxiliary jet burner disposed in the combustor body near the main combustion burner, and an airflow of pulverized coal to the main combustion burner. A pulverized coal combustion device comprising: a main pipe for transporting the pulverized coal by a main pipe; and an injector that sucks a part of the pulverized coal transported in the main pipe together with a transport airflow, pressurizes it, and supplies it to the auxiliary jet burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6976484U JPS60181520U (en) | 1984-05-15 | 1984-05-15 | Pulverized coal combustion equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6976484U JPS60181520U (en) | 1984-05-15 | 1984-05-15 | Pulverized coal combustion equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60181520U JPS60181520U (en) | 1985-12-02 |
| JPH0129364Y2 true JPH0129364Y2 (en) | 1989-09-07 |
Family
ID=30605745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6976484U Granted JPS60181520U (en) | 1984-05-15 | 1984-05-15 | Pulverized coal combustion equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60181520U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62190314A (en) * | 1986-01-17 | 1987-08-20 | Takuma Co Ltd | High load combustion method for coal and water slurry and device thereof |
| JP7326173B2 (en) * | 2020-01-28 | 2023-08-15 | 株式会社神鋼環境ソリューション | Dust collector dust circulation device |
-
1984
- 1984-05-15 JP JP6976484U patent/JPS60181520U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60181520U (en) | 1985-12-02 |
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