JPS63176908A - Combustion furnace - Google Patents

Combustion furnace

Info

Publication number
JPS63176908A
JPS63176908A JP641587A JP641587A JPS63176908A JP S63176908 A JPS63176908 A JP S63176908A JP 641587 A JP641587 A JP 641587A JP 641587 A JP641587 A JP 641587A JP S63176908 A JPS63176908 A JP S63176908A
Authority
JP
Japan
Prior art keywords
combustion
furnace
flame
main
main fuel
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.)
Granted
Application number
JP641587A
Other languages
Japanese (ja)
Other versions
JPH0578723B2 (en
Inventor
Yoshitoshi Sekiguchi
善利 関口
Kunio Sasaki
邦夫 佐々木
Shinichi Sakai
坂井 伸一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Zosen Corp
Original Assignee
Hitachi Zosen Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Zosen Corp filed Critical Hitachi Zosen Corp
Priority to JP641587A priority Critical patent/JPS63176908A/en
Publication of JPS63176908A publication Critical patent/JPS63176908A/en
Publication of JPH0578723B2 publication Critical patent/JPH0578723B2/ja
Granted legal-status Critical Current

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  • Combustion Of Fluid Fuel (AREA)

Abstract

PURPOSE:To provide a combustion furnace which is free from deposition of a scale on the inner wall surface of a furnace body and enables continuous combustion operation, by providing a feed port for secondary air for main combustion, a main fuel injection nozzle for forming a main flame, and a feed port for tertiary air for main fuel combustion. CONSTITUTION:Main fuel F, injected through a main fuel injection nozzle 8 toward as assist combustion flame, is burnt by means of secondary air A2 fed from the inner peripheral part thereof and tertiary air A3 fed from the outer peripheral part thereof to form a vertical down main flame at the central part of the interior of a furnace body 1. In this case, since the tertiary air A3 is fed from the peripheral part of the main fuel F toward the main flame, a combustion product is prevented from making direct contact with the inner wall surfaces of a furnace top part 1a and a furnace side wall part 1b. Even when fuel containing an ash content is used as the main fuel F, the ash content forms scales which are adhered on the inner wall surfaces of the furnace top part 1a and the furnace side wall part 1b, and is prevented from growing. This constitution enables execution of long-term continuous operation.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、灰分などを含む燃料を用いる、たとえば熱風
発生用などの燃焼炉に関するものである。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion furnace, for example for generating hot air, using a fuel containing ash or the like.

従来の技術 従来、たとえば熱8a発生炉などの燃焼炉として第4図
に示すようなものが用いられている。すなわち、竪型の
炉本体21の炉頂部21aの中央部に環状の保炎筒22
を設け、その中央に燃料噴射ノズル23と燃焼用の1次
空気の供給口24と助燃料噴射ノズル25とを配設し、
さらに前記保炎筒22の外側面に燃焼用の2次空気の供
給口26が設けられている。
2. Description of the Related Art Conventionally, a combustion furnace such as a heat generating furnace 8a as shown in FIG. 4 has been used. That is, an annular flame-holding cylinder 22 is provided at the center of the furnace top 21a of the vertical furnace body 21.
A fuel injection nozzle 23, a primary air supply port 24 for combustion, and an auxiliary fuel injection nozzle 25 are arranged in the center thereof,
Furthermore, a secondary air supply port 26 for combustion is provided on the outer surface of the flame stabilizing cylinder 22.

炉本体21の側壁21bは2重壁21cに形成され、水
冷されている。炉本体21の外部には、炉内に水、蒸気
などの冷却媒体を供給する冷却媒体噴射口27が設けら
れている。28は各空気供給口24.26に設置した旋
回羽根である。
The side wall 21b of the furnace body 21 is formed into a double wall 21c and is water-cooled. A cooling medium injection port 27 is provided outside the furnace body 21 to supply a cooling medium such as water or steam into the furnace. 28 is a swirl vane installed at each air supply port 24 and 26.

発明が解決しようとする問題点 上記の従来の燃焼炉では、燃料Fと空気Aの混合および
火炎を安定させるため、保炎筒22を設け、かつ旋回羽
根28などにより燃焼用空気入に旋回を与えて、保炎筒
22近傍および炉内に渦を発生させている。このような
燃焼炉において、灰分などの燃焼生成物が、炉本体21
の内壁面に接触することによってスケールとして析出す
る性質を有する微粉炭などの燃料を用いると、保炎筒2
2の内面あるいは炉本体21の内壁面に燃焼生成物がス
ケール29となって付着、成長して、連続燃焼運転が妨
げられている。
Problems to be Solved by the Invention In the conventional combustion furnace described above, in order to stabilize the mixture of fuel F and air A and the flame, a flame stabilizing tube 22 is provided, and the combustion air intake is provided with a swirling blade 28 or the like. As a result, a vortex is generated near the flame stabilizing tube 22 and inside the furnace. In such a combustion furnace, combustion products such as ash are absorbed into the furnace body 21.
When using fuel such as pulverized coal, which has the property of precipitating as scale when it comes into contact with the inner wall surface of the flame-holding tube 2,
Combustion products adhere and grow as a scale 29 on the inner surface of the furnace 2 or the inner wall surface of the furnace body 21, hindering continuous combustion operation.

本発明は上記の問題点を解決するもので、灰分などを含
有する燃料を用いても、炉本体の内壁面にスケールが析
出することがない、連続燃焼運転が可能な燃焼炉を提供
することを目的とするものである。
The present invention solves the above-mentioned problems, and provides a combustion furnace capable of continuous combustion operation in which scale is not deposited on the inner wall surface of the furnace body even when fuel containing ash is used. The purpose is to

問題点を解決するための手段 上記の問題点を解決するため本発明の燃焼炉は、竪型の
炉本体に、炉内に竪方向に助燃料を噴射して助燃火炎を
形成する助燃バーナを配設し、この助燃バーナの外周部
に同心環状に順次助燃料燃焼用の1次空気の供給口、主
燃料燃焼用の2次空気の供給口、主火炎を形成する主燃
料の噴射ノズルおよび主燃料燃焼用の3次空気の供給口
を配設したことを特徴とするものである。
Means for Solving the Problems In order to solve the above-mentioned problems, the combustion furnace of the present invention has a vertical furnace body equipped with an auxiliary burner that injects auxiliary fuel vertically into the furnace to form an auxiliary flame. A primary air supply port for auxiliary fuel combustion, a secondary air supply port for main fuel combustion, a main fuel injection nozzle for forming a main flame, and This is characterized by the provision of a tertiary air supply port for main fuel combustion.

作用 上記の構成において、助燃バーナにより助燃料と1次空
気により安定な助燃火炎、すなわち主燃料の着火源が確
保され、助燃火炎の周囲に2次空気とその外側から主燃
料が供給されて、その外周部から供給される3次空気と
によって燃焼されて炉内の中心部に竪方向の主火炎が形
成され、しかも供給される主燃料の内周部に2次空気が
供給され、外周部に3次空気が供給されるので、主燃料
が助燃火炎の内部に侵入することが妨げられて、助燃バ
ーナ付近の内壁面などへスケールが析出することが防止
され、また主火炎および燃焼生成物と炉本体内壁面との
間が3次空気によって遮断されて、内壁面へスケールが
付着し、成長することが防止されて、長期連続運転を行
なうことができる。
Operation In the above configuration, the auxiliary combustion burner ensures a stable auxiliary combustion flame using the auxiliary fuel and primary air, that is, the ignition source for the main fuel, and the secondary air and the main fuel are supplied around the auxiliary flame from the outside. , and tertiary air supplied from the outer periphery to form a vertical main flame in the center of the furnace, and secondary air is supplied to the inner periphery of the main fuel to be supplied, Since tertiary air is supplied to the auxiliary burner, the main fuel is prevented from entering into the auxiliary combustion flame, and scale is prevented from depositing on the inner wall surface near the auxiliary burner. Tertiary air blocks the space between the material and the inner wall surface of the furnace main body, preventing scale from adhering to the inner wall surface and growing, allowing long-term continuous operation.

実施例 本発明の実施例を図面に基づいて説明する。Example Embodiments of the present invention will be described based on the drawings.

第1図〜第2図は、本発明の第1実施例の燃焼炉を示す
。第1図〜第2図において、竪型の炉本体1の円錐形状
に形成された炉頂部1aの中央部に、保炎筒2が炉本体
1の炉心方向(竪方向)に配設され、その下端部2aが
炉本体1内に開口し、2重壁で形成されて内部に冷却水
Wが通されている。前記保炎筒2の中心部に上方から助
燃バーナ3が挿入され、保炎筒2内の下部から炉本体1
内に向かって垂直下向きの助燃火炎を形成するように配
設されている。助燃バーナ3へ助燃料fを供給する助燃
料供給管3aと保炎$I2の上端部2bとの間に、助燃
″j4fの燃焼用の1次空気A1を保炎筒2内に供給す
るための1次空気供給口4が設けられて旋回羽根4aが
取付けられ、この保炎筒2の上端部2bおよび旋回羽根
4aの上方に1次空気供給ダクト5が設けられている。
1 and 2 show a combustion furnace according to a first embodiment of the present invention. 1 and 2, a flame stabilizing cylinder 2 is disposed in the central part of the conically shaped furnace top 1a of the vertical furnace body 1 in the core direction (vertical direction) of the furnace body 1, Its lower end 2a opens into the furnace body 1, is formed with a double wall, and the cooling water W is passed inside. An auxiliary combustion burner 3 is inserted into the center of the flame stabilizing tube 2 from above, and a furnace main body 1 is inserted from the bottom inside the flame stabilizing tube 2.
It is arranged so as to form an auxiliary combustion flame directed vertically downward inward. To supply primary air A1 for combustion of auxiliary combustion "j4f" into the flame stabilizing cylinder 2 between the auxiliary fuel supply pipe 3a that supplies the auxiliary fuel f to the auxiliary combustion burner 3 and the upper end 2b of the flame stabilizing pipe $I2. A primary air supply port 4 is provided and a swirling vane 4a is attached thereto, and a primary air supply duct 5 is provided above the upper end 2b of the flame stabilizing tube 2 and the swirling vane 4a.

前記保炎WJ2の外周部に、2次空気A2を炉本体1内
へ供給するスリット状の2次空気供給口6が同心環状に
設けられており、等間隔に複数枚(4枚)の整流板6a
が配設されて、2次空気A2が旋回することなく供給さ
れる。前記2次空気供給口6の上方に2次空気供給ダク
ト7が設けられている。
A slit-shaped secondary air supply port 6 for supplying secondary air A2 into the furnace body 1 is provided in a concentric ring shape on the outer periphery of the flame-holding WJ2, and a plurality of (four) rectifying ports are provided at equal intervals. Board 6a
is provided, and the secondary air A2 is supplied without swirling. A secondary air supply duct 7 is provided above the secondary air supply port 6.

前記2次空気供給口6の外周部の、円錐形状の炉頂部1
aに、主燃料Fを炉本体1内へ供給する複数g<8@)
の主燃料噴射ノズル8の1列と3次空気A3を炉本体1
内へ供給する複数11!I(8個)の管状の3次空気供
給口9の2列が、同心環状に配設されている。前記各主
燃料噴射ノズル8および各3次空気供給口9は、主燃料
Fおよび3次空気A3が垂直下向きの助燃火炎に向かっ
て供給されるように適宜傾斜して設けられている。10
は3次空気供給ダクトである。
A conical furnace top 1 on the outer periphery of the secondary air supply port 6
A, a plurality of g < 8 @) which supplies the main fuel F into the furnace body 1
One row of main fuel injection nozzles 8 and tertiary air A3 are injected into the furnace body 1.
Multiple 11 feeding inside! Two rows of I (eight) tubular tertiary air supply ports 9 are arranged in a concentric ring shape. Each of the main fuel injection nozzles 8 and each of the tertiary air supply ports 9 is provided with an appropriate inclination so that the main fuel F and the tertiary air A3 are supplied toward the vertically downward auxiliary combustion flame. 10
is the tertiary air supply duct.

炉本体1の炉頂部1aおよび炉側壁部1bは、2重壁1
Cで形成され、内部に冷却水Wを通して冷却されている
。炉側壁部1bの下部に、炉本体1内の主火炎の先端部
に向って冷却用の水または蒸気を噴射する、冷却媒体噴
射口11が設けられている。また炉底部1dは逆円錐形
状に形成され、その中央部に燃焼排ガス取出口1eが設
けられている。
The furnace top part 1a and the furnace side wall part 1b of the furnace body 1 have a double wall 1.
C, and is cooled by passing cooling water W inside. A cooling medium injection port 11 for injecting water or steam for cooling toward the tip of the main flame in the furnace body 1 is provided at the lower part of the furnace side wall 1b. Further, the furnace bottom 1d is formed into an inverted conical shape, and a combustion exhaust gas outlet 1e is provided in the center thereof.

上記の燃焼炉において、まず助燃バーナ3に助燃料fを
供給し、旋回羽根4aの作用で旋回して供給される1次
空気A1によって安定な垂直下向きの助燃火炎を形成し
て、主燃料Fの着火源を確保する。この助燃火炎の周囲
には、2次空気A2がスリット状の2次空気供給口6か
ら環状に旋回することなく供給されているので、その外
周部に配設された主燃料噴射ノズル8から噴射される主
燃料Fが、助燃火炎の内部に侵入することが防がれて、
主燃料Fの灰分などが保!jf&2j2の内壁面や炉頂
部1aの内壁面にスケールとなって付着し、成長するこ
とが防止される。
In the above-mentioned combustion furnace, the auxiliary fuel f is first supplied to the auxiliary burner 3, and a stable vertically downward auxiliary flame is formed by the primary air A1 which is swirled and supplied by the action of the swirl vane 4a, and the main fuel F Secure an ignition source. Since the secondary air A2 is supplied around this auxiliary combustion flame from the slit-shaped secondary air supply port 6 without swirling in an annular manner, the secondary air A2 is injected from the main fuel injection nozzle 8 disposed on the outer periphery of the secondary air A2. The main fuel F is prevented from entering the auxiliary flame,
Preserves the ash content of main fuel F! This prevents scale from adhering and growing on the inner wall surface of jf&2j2 and the inner wall surface of the furnace top 1a.

主燃料噴射ノズル8から助燃火炎に向かって噴射された
主燃料Fは、その内周部から供給される2次空気A2と
外周部から供給される3次空気A3とによって燃焼して
、炉本体1内の中心部に垂直下向きの主火炎が形成され
る。このとき、主燃料Fの外周部から3次空気A3が主
火炎に向かって供給されるので、燃焼生成物が直接炉頂
部1aや炉側壁部1bの内壁面に接触することが防がれ
て、主燃料Fとして灰分を含むものを用いても、その灰
分がスケールとなって炉頂部1aや炉側壁部1bの内壁
面に付着し、成長することが防止される。これにより長
期連続運転ができる。
The main fuel F injected from the main fuel injection nozzle 8 toward the auxiliary flame is combusted by the secondary air A2 supplied from the inner periphery and the tertiary air A3 supplied from the outer periphery, and the main fuel F is combusted by the furnace main body. A vertically downward main flame is formed at the center of 1. At this time, since the tertiary air A3 is supplied from the outer circumference of the main fuel F toward the main flame, the combustion products are prevented from coming into direct contact with the inner wall surface of the furnace top 1a and the furnace side wall 1b. Even if a fuel containing ash is used as the main fuel F, the ash is prevented from becoming scale and adhering to and growing on the inner wall surface of the furnace top 1a and the furnace side wall 1b. This allows long-term continuous operation.

また上記燃焼炉は、炉本体1の炉頂部1a、炉側壁部1
bおよび保炎1i2が2重壁構造で水冷されているので
、万一燃焼生成物がそれらの内壁面に接触しても、急冷
されてスケールとなることなく固体粒子となって、燃焼
排ガスに同伴されて炉外へ排出される。さらに主火炎の
先端部に冷却媒体噴射口11から水または蒸気などの冷
却媒体を噴射して、燃焼ガスを固体生成物の融点以下に
急冷すれば、炉底部1d付近でのスケール付着が防止さ
れ、また燃焼ガスの体積を減少することができて、以降
の燃焼ガス関連の装置類をコンパクトにすることができ
る。
Further, the above-mentioned combustion furnace includes a furnace top portion 1a of the furnace body 1, a furnace side wall portion 1
b and flame holding 1i2 have a double-walled structure and are water-cooled, so even if combustion products should come into contact with their inner walls, they will be rapidly cooled and turn into solid particles without forming scales and will not be released into the combustion exhaust gas. It is entrained and discharged out of the furnace. Furthermore, if a cooling medium such as water or steam is injected into the tip of the main flame from the cooling medium injection port 11 to rapidly cool the combustion gas to below the melting point of the solid product, scale adhesion near the furnace bottom 1d can be prevented. Moreover, the volume of combustion gas can be reduced, and subsequent combustion gas-related devices can be made more compact.

第3図は、本発明の第2実施例の燃焼炉を示す。FIG. 3 shows a combustion furnace according to a second embodiment of the invention.

この第2実施例の燃焼炉は、上記第1図〜第2図に示す
第1実施例の燃焼炉が、炉本体1の炉頂部1aの主燃料
噴射ノズル8の外周部に配設する3次空気供給口として
、複数個の管状の3次空気供給口9を同心環状の2列に
配列したのに代えて、炉頂部1aの炉壁を多孔板12で
形成し、その多孔板t2の背面側に3次空気供給ダクト
13を設けて、前記多孔板12が有する多数の貫通孔1
2aを3次空気供給口として炉本体1内へ3次空気を供
給するようにし、また多孔板12の背面に接して適宜の
間隔で冷却水管14を複数本配列し、かつ主燃料噴射ノ
ズル8を前記多孔板12を貫通して配設し、さらに炉側
壁部1bだけを2重壁1Cとして水冷するようにしたも
のであり、そのほかは第1実施例の燃焼炉と全く同様の
構造を有している。
The combustion furnace of the second embodiment is different from the combustion furnace of the first embodiment shown in FIGS. Instead of arranging a plurality of tubular tertiary air supply ports 9 in two concentric annular rows as secondary air supply ports, the furnace wall of the furnace top 1a is formed with a perforated plate 12, and the perforated plate t2 is A tertiary air supply duct 13 is provided on the back side, and a large number of through holes 1 of the perforated plate 12 are provided.
2a is used as a tertiary air supply port to supply tertiary air into the furnace body 1, and a plurality of cooling water pipes 14 are arranged at appropriate intervals in contact with the back surface of the perforated plate 12, and the main fuel injection nozzle 8 is disposed through the perforated plate 12, and only the furnace side wall 1b is made into a double wall 1C and is water-cooled.Other than that, the combustion furnace has exactly the same structure as the combustion furnace of the first embodiment. are doing.

第2実施例の燃焼炉は上記のような構造を有し、上記第
1実施例の燃焼炉と同様の作用により、保炎筒2の周辺
、炉頂部1aおよび炉側壁部1bの内壁面に燃焼生成物
がスケールとなって付着し、成長することがなく、長期
連続運転が可能である。
The combustion furnace of the second embodiment has the above-described structure, and by the same action as the combustion furnace of the first embodiment, the inner wall surfaces of the periphery of the flame-holding tube 2, the furnace top 1a, and the furnace side wall 1b are heated. Combustion products do not adhere or grow as scale, and long-term continuous operation is possible.

なお、炉底部1dに燃料および燃焼用空気を供給する形
式の燃焼炉の場合も同様に構成することができる。
Note that a similar configuration can be applied to a combustion furnace in which fuel and combustion air are supplied to the furnace bottom 1d.

発明の効果 本発明の燃焼炉は、以上のように主燃料として灰分など
を含む微粉炭などの燃料を用いても、炉本体の内壁面な
どに燃焼生成物がスケールとして付着し、成長すること
が防止され、保守、管理が容易で、長期連続運転ができ
るという格別の効果を奏する。
Effects of the Invention As described above, even if the combustion furnace of the present invention uses fuel such as pulverized coal containing ash as the main fuel, the combustion products will not adhere and grow as scale on the inner wall surface of the furnace body. It has the special effects of being able to prevent damage, be easy to maintain and manage, and be able to operate continuously for a long period of time.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の第1実施例の燃焼炉の縦断面図、第2
図は第1図のI−I線断面図、第3図は本発明の第2実
施例の燃焼炉の縦断面図、第4図は従来の燃焼炉の縦断
面図である。 1・・・炉本体、2・・・保炎筒、3・・・助燃バーナ
、4・・・1次空気供給口、6・・・2次空気供給口、
8・・・主燃料噴射ノズル、9・・・3次空気供給口、
12・・・多孔板、12a・・・貫通孔。 代理人   森  本  義  弘 第1図 第2図 第3図 、z、、、、y通J/− 第4図
FIG. 1 is a longitudinal sectional view of a combustion furnace according to a first embodiment of the present invention, and a second embodiment of the present invention is shown in FIG.
The drawings are a sectional view taken along the line II in FIG. 1, FIG. 3 is a longitudinal sectional view of a combustion furnace according to a second embodiment of the present invention, and FIG. 4 is a longitudinal sectional view of a conventional combustion furnace. DESCRIPTION OF SYMBOLS 1...Furnace body, 2...Flame stabilizing tube, 3...Assistant burner, 4...Primary air supply port, 6...Secondary air supply port,
8... Main fuel injection nozzle, 9... Tertiary air supply port,
12... Porous plate, 12a... Through hole. Agent Yoshihiro Morimoto Figure 1 Figure 2 Figure 3

Claims (1)

【特許請求の範囲】[Claims] 1、竪型の炉本体に、炉内に竪方向に助燃料を噴射して
助燃火炎を形成する助燃バーナを配設し、この助燃バー
ナの外周部に同心環状に順次助燃料燃焼用の1次空気の
供給口、主燃料燃焼用の2次空気の供給口、主火炎を形
成する主燃料の噴射ノズルおよび主燃料燃焼用の3次空
気の供給口を配設したことを特徴とする燃焼炉。
1. An auxiliary combustion burner that injects auxiliary fuel vertically into the furnace to form an auxiliary combustion flame is installed in the vertical furnace body. Combustion characterized by having a secondary air supply port, a secondary air supply port for main fuel combustion, a main fuel injection nozzle forming a main flame, and a tertiary air supply port for main fuel combustion. Furnace.
JP641587A 1987-01-14 1987-01-14 Combustion furnace Granted JPS63176908A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP641587A JPS63176908A (en) 1987-01-14 1987-01-14 Combustion furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP641587A JPS63176908A (en) 1987-01-14 1987-01-14 Combustion furnace

Publications (2)

Publication Number Publication Date
JPS63176908A true JPS63176908A (en) 1988-07-21
JPH0578723B2 JPH0578723B2 (en) 1993-10-29

Family

ID=11637736

Family Applications (1)

Application Number Title Priority Date Filing Date
JP641587A Granted JPS63176908A (en) 1987-01-14 1987-01-14 Combustion furnace

Country Status (1)

Country Link
JP (1) JPS63176908A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105485669A (en) * 2014-04-17 2016-04-13 洪序明 Compression type combustion furnace

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105485669A (en) * 2014-04-17 2016-04-13 洪序明 Compression type combustion furnace
CN105485668A (en) * 2014-04-17 2016-04-13 洪序明 Compression type combustion furnace

Also Published As

Publication number Publication date
JPH0578723B2 (en) 1993-10-29

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