JPH0526421A - Refuse combustion method in dust incinerator - Google Patents

Refuse combustion method in dust incinerator

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Publication number
JPH0526421A
JPH0526421A JP17966091A JP17966091A JPH0526421A JP H0526421 A JPH0526421 A JP H0526421A JP 17966091 A JP17966091 A JP 17966091A JP 17966091 A JP17966091 A JP 17966091A JP H0526421 A JPH0526421 A JP H0526421A
Authority
JP
Japan
Prior art keywords
combustion
air
stoker
exhaust gas
gas
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.)
Pending
Application number
JP17966091A
Other languages
Japanese (ja)
Inventor
Haruo Miyata
治男 宮田
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.)
Sanki Engineering Co Ltd
Original Assignee
Sanki Engineering Co Ltd
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 Sanki Engineering Co Ltd filed Critical Sanki Engineering Co Ltd
Priority to JP17966091A priority Critical patent/JPH0526421A/en
Publication of JPH0526421A publication Critical patent/JPH0526421A/en
Pending legal-status Critical Current

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  • Incineration Of Waste (AREA)

Abstract

PURPOSE:To reduce a rate of remaining unburned gas and to perform a more complete combustion of refuses by a method wherein the unburned gas in the discharged gas generated by the primary combustion is ignited again. CONSTITUTION:Hot primary air is blown from a lower part of each of a drying stoker 5, a combustion stoker 6 and a post-combustion stoker 7 so as to perform a stable combustion of refuse on each of the stokers, and then the generated discharged gas is fed into the secondary combustion chamber 15. In turn, an amount of secondary air corresponding to that of primary air is blown into the secondary combustion chamber 15 from a secondary air blower 11 through an air preheater 23 so as to promote a mixing of the remained unburned gas in the discharged gas. In this case, the amount of secondary air is about 1/1.5 of that of the primary air. In addition, the discharged gas generated through the secondary combustion ascends with the discharged gas generated through the primary combustion and reaches the third combustion chamber 16. In turn, the third air is sucked from the third air blower 12 into the third combustion chamber 16 through a plurality of third air suction nozzles 12A so as to promote mixing with the remained unburned gas in the discharged gas and further to promote the third combustion at the third combustion chamber 16.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、ごみ焼却炉における排
ガス中の残留未燃ガスを再燃させるごみ焼却炉のごみ燃
焼方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of burning waste in an incinerator for reburning residual unburned gas in exhaust gas from the incinerator.

【0002】[0002]

【従来の技術】一般に、家庭等から排出される可燃ごみ
は、回収され、例えば特開平3−28617号公報に示
すようなごみ焼却炉で焼却して処分されている。一般
に、このような焼却炉は、ごみクレーン(図示せず)に
よりごみが供給されるホッパと、このホッパからごみを
案内するホッパシュートと、このホッパシュートのごみ
を移送するごみ押出機を有する給塵装置と、給塵装置に
より供給されたごみを乾燥する乾燥ストーカと、乾燥ス
トーカからのごみを燃焼する燃焼ストーカと、燃焼スト
ーカからのごみをおき火燃焼させる後燃焼ストーカとを
備えている。乾燥ストーカ,燃焼ストーカ,後燃焼スト
ーカは炉体下部に設けられ、炉体上部には排ガス冷却室
が形成され、さらに、炉体上端には排ガスを排出する排
出口が形成されている。
2. Description of the Related Art In general, combustible waste discharged from homes is collected and incinerated in a refuse incinerator as disclosed in Japanese Patent Laid-Open No. 3-28617. Generally, such an incinerator has a hopper to which waste is supplied by a waste crane (not shown), a hopper chute that guides the waste from the hopper, and a waste extruder that transfers the waste of the hopper chute. It is provided with a dust device, a dry stoker that dries the dust supplied by the dust supply device, a combustion stoker that burns the dust from the dry stoker, and a post-combustion stoker that burns the dust from the burning stoker and burns it. The dry stoker, the combustion stoker, and the post-combustion stoker are provided in the lower part of the furnace body, the exhaust gas cooling chamber is formed in the upper part of the furnace body, and the exhaust port for discharging the exhaust gas is formed in the upper end of the furnace body.

【0003】炉体の乾燥ストーカ,燃焼ストーカ,後燃
焼ストーカ内に、それらの各下部空気吹込口から、高温
の一次空気が吹き込まれる。ごみは、乾燥ストーカにお
いて、攪拌・解きほぐされながら前方に移送され、乾燥
ストーカから燃焼ストーカに運ばれ、さらに、燃焼スト
ーカで、攪拌・解きほぐされながら一次燃焼され、前方
に移送して後燃焼ストーカに運ばれる。
High-temperature primary air is blown into the dry stoker, the combustion stoker, and the post-combustion stoker of the furnace body from their respective lower air blowing ports. In the dry stoker, the waste is transferred to the front while being stirred and unraveled, is transported from the dry stoker to the combustion stoker, and is further burned by the combustion stoker while being stirred and unraveled, and is transferred to the front and post-combusted. Carried to the stalker.

【0004】そして、炉冷却ファンと呼ばれて炉出口付
近に設けられた送風機は、燃焼温度が高くなった場合に
常温の空気を吹き込むように操作され、炉体上部の排ガ
ス冷却室に導かれた排ガスを冷却していた。
A blower, called a furnace cooling fan, provided near the furnace outlet is operated so as to blow air at room temperature when the combustion temperature rises, and is guided to the exhaust gas cooling chamber above the furnace body. The exhaust gas was being cooled.

【0005】即ち、一次燃焼による燃焼温度が上昇した
ときのみ、ごみ焼却炉の炉出口の排ガス温度制御とし
て、冷却空気を吹き込むといった考え方で燃焼が制御さ
れていた。
That is, only when the combustion temperature due to the primary combustion rises, combustion was controlled by blowing cooling air as the exhaust gas temperature control at the furnace outlet of the refuse incinerator.

【0006】[0006]

【発明が解決しようとする課題】上述のように、炉出口
付近に設けられる送風機は、炉冷却ファンと呼ばれ、炉
温が高くなった場合に吹き込むように操作され、炉温が
制御されていたが、燃焼制御ではなかった。従来におけ
るごみ焼却炉の二次燃焼は、炉体の形状の工夫等によ
り、高温の排ガスと未燃ガスとを接触させることによ
り、また、その滞留時間をより長く取る方が良いとさ
れ、排ガスの二次燃焼のために再燃空気を積極的に吹き
込むことは行なわれていなかった。
As described above, the blower provided in the vicinity of the furnace outlet is called a furnace cooling fan, and is operated so as to blow it when the furnace temperature becomes high, and the furnace temperature is controlled. However, it was not combustion control. In the secondary combustion of the conventional refuse incinerator, it is better to make the residence time longer by bringing the hot exhaust gas and unburned gas into contact with each other by devising the shape of the furnace body. The re-injection of the reburning air for the secondary combustion was not performed.

【0007】このような状況下、近年、ダイオキシンの
問題等により、ごみの完全燃焼の達成が求められるよう
になってきた。従来の炉温をある範囲にすれば良いとい
うだけの炉温管理から、より高度の完全燃焼管理が求め
られるよになってきた。完全燃焼達成は、排ガス中のC
O濃度や排ガス中のカーボンの残量等により評価され
る。
Under these circumstances, in recent years, due to the problem of dioxins and the like, achievement of complete combustion of waste has been required. A higher level of complete combustion control has been required from the conventional furnace temperature control, which only requires the furnace temperature to be within a certain range. Achieving complete combustion requires C in the exhaust gas
It is evaluated based on the O concentration, the amount of carbon remaining in the exhaust gas, and the like.

【0008】このように排ガスの浄化が求められている
中、炉体の燃焼ストーカ上の燃焼帶でのごみは、完全燃
焼若しくはそれに近い状態で燃焼され、完全燃焼の排ガ
スが発生するが、乾燥ストーカ上の乾燥帶では、未だ充
分に乾いていないごみが燃焼されることから、不完全燃
焼の排ガスが発生する虞が多い。
While the purification of the exhaust gas is demanded in this way, the dust in the combustor on the combustion stoker of the furnace body is completely burned or burned in a state close to that, and exhaust gas of complete combustion is generated. In the dry bed on the stoker, since the garbage that has not dried sufficiently is burned, incomplete combustion exhaust gas is likely to be generated.

【0009】そこで、ごみの完全燃焼を達成させるに
は、一次燃焼側のより安定した燃焼(ごみ供給量,一次
空気量制御)と、一次燃焼では取り残される高温の排ガ
ス中の未燃ガスを、二次燃焼区間にて、二次空気と混合
させ、二次燃焼を促進させることが要求される。
Therefore, in order to achieve complete combustion of dust, more stable combustion on the primary combustion side (waste supply amount, primary air amount control) and unburned gas in the high-temperature exhaust gas left behind in the primary combustion, In the secondary combustion section, it is required to mix with secondary air to promote secondary combustion.

【0010】ところが、二次燃焼を促進させようとして
も、炉冷却用として二次燃焼区間へ一次空気を送る制御
では、特に、炉温低下時に、二次空気が吹き込まれなく
なるため、二次空気の供給量が一次空気量に対して不足
したり、或いは、混合用の風速が得られなくなり、完全
燃焼の達成には遠く、例えば、CO濃度は、通常炉温時
の10〜100倍のピーク値となることもある。
However, even if an attempt is made to promote the secondary combustion, in the control for sending the primary air to the secondary combustion section for cooling the furnace, the secondary air is not blown in particularly when the temperature of the furnace is lowered, so that the secondary air is not blown. Is insufficient for the primary air amount, or the wind speed for mixing cannot be obtained, and it is far from achieving complete combustion. For example, the CO concentration is 10 to 100 times the peak at the normal furnace temperature. It may be a value.

【0011】本発明は、上述の問題点を解決するために
なされたもので、その目的は、一次燃焼で発生する排ガ
ス中の未燃ガスを再燃させ、未燃ガスの残存率を少なく
してごみをより完全燃焼させることができるごみ焼却炉
における燃焼制御方法を提供することである。
The present invention has been made to solve the above-mentioned problems, and an object thereof is to reburn unburned gas in exhaust gas generated in primary combustion to reduce the residual rate of unburned gas. It is an object of the present invention to provide a combustion control method in a refuse incinerator that can burn the refuse more completely.

【0012】[0012]

【課題を解決するための手段】本発明は、ごみ焼却炉の
ストーカに一次空気を供給してごみを燃焼をさせ、排ガ
スを炉体に導くごみ焼却炉のごみ燃焼方法において、排
ガス中の残留未燃ガスとの混合を促進するように一次空
気に対応した量の二次空気を炉体内に供給し、さらに、
所定の量の三次空気を、排ガス中の残留未燃ガスと再混
合を促進するように炉体内に供給することを特徴とす
る。
SUMMARY OF THE INVENTION The present invention is a waste incinerator waste combustion method for supplying waste air to a stoker of a waste incinerator to burn the waste and leading the waste gas to a furnace body. The secondary air is supplied to the furnace body in an amount corresponding to the primary air so as to promote mixing with unburned gas, and further,
It is characterized in that a predetermined amount of tertiary air is supplied into the furnace body so as to promote remixing with residual unburned gas in the exhaust gas.

【0013】[0013]

【作用】本発明においては、炉体に設けた二次空気用送
風機により、排ガス中の残留未燃ガスとの混合を促進す
るように所定の量の二次空気を炉体内に供給し、さら
に、三次空気を、排ガス中の残留未燃ガスと再混合を促
進するように炉体内に供給する。
In the present invention, a secondary air blower provided in the furnace body supplies a predetermined amount of secondary air into the furnace body so as to promote mixing with residual unburned gas in the exhaust gas. , Tertiary air is supplied into the furnace body to promote remixing with residual unburned gas in the exhaust gas.

【0014】[0014]

【実施例】以下、図面により本発明の実施例について説
明する。図1は本発明の実施例に係わるごみ焼却炉の構
成図である。図1において、符号1はごみ焼却炉を示し
ている。このごみ焼却炉1は、ごみクレーン(図示せ
ず)によりごみが供給されるホッパ2と、このホッパ2
からごみを案内するホッパシュート3と、このホッパシ
ュート3のごみを移送するごみ押出機4を有する給塵装
置と、給塵装置により供給されたごみを乾燥する乾燥ス
トーカ5と、乾燥ストーカ5からのごみを燃焼する燃焼
ストーカ6と、燃焼ストーカ6からのごみをおき火燃焼
させる後燃焼ストーカ7とを備えている。上記のごみ押
出機4は、ホッパシュート3の下部に設けられている。
乾燥ストーカ5,燃焼ストーカ6,後燃焼ストーカ7
は、炉体8内に収容され、この炉体8の上端には燃焼ガ
スを排出する排出口9が形成され、炉体8の側壁面に
は、冷却水供給口10と、2次空気用送風機11の供給
部11Aと、冷却水供給口10と2次空気用送風機11
の供給部11Aの間の3次空気用送風機12とが配設さ
れ、炉体8の下端には助燃バーナ13が配設されてい
る。炉体8の内部は、乾燥ストーカ5,燃焼ストーカ
6,後燃焼ストーカ7の上方にある一次燃焼室14と、
2次空気用送風機11付近の二次燃焼室15と、二次燃
焼室15の上方の三次燃焼室16と、三次燃焼室16の
上方のガス冷却室17とで構成されている。上記の二次
空気用送風機11は炉体8の一次燃焼室14の直上に設
けられている。なお、炉体8の三次燃焼室16,ガス冷
却室17付近の断面は円形状に構成され、図2に示すよ
うに、炉体8の三次燃焼室16における壁面には、3次
空気用送風機12から空気が送られる複数の三次空気吹
込ノズル12Aが所定の間隔で円周状に設けられてい
る。各三次空気吹込ノズル12Aの吹込み方向は、それ
ぞれ炉体8の壁面に対して所定の傾斜角度で、且つ炉体
8の接線方向に対して同一傾斜角度となっており、炉体
8内に二次空気の渦流を生成するようになっている。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a refuse incinerator according to an embodiment of the present invention. In FIG. 1, reference numeral 1 indicates a refuse incinerator. The waste incinerator 1 includes a hopper 2 to which waste is supplied by a waste crane (not shown), and the hopper 2
From a hopper chute 3 that guides trash, a dust extruder having a trash chute 3 that transfers trash from the hopper chute 3, a drying stoker 5 that dries the dust supplied by the dust hopper, and a drying stoker 5 It is provided with a combustion stoker 6 that burns the waste and a post-combustion stoker 7 that burns the waste from the combustion stoker 6 and burns it. The waste extruder 4 is provided below the hopper chute 3.
Dry stoker 5, Burning stoker 6, Post-burning stoker 7
Are housed in a furnace body 8, and an exhaust port 9 for discharging combustion gas is formed at an upper end of the furnace body 8. A side wall surface of the furnace body 8 is provided with a cooling water supply port 10 and secondary air. Supply unit 11A of blower 11, cooling water supply port 10 and blower 11 for secondary air
A blower 12 for the tertiary air is provided between the supply sections 11A of the above, and an auxiliary combustion burner 13 is provided at the lower end of the furnace body 8. Inside the furnace body 8, a primary combustion chamber 14 above the dry stoker 5, the combustion stoker 6, and the post-combustion stoker 7,
It is composed of a secondary combustion chamber 15 near the blower 11 for the secondary air, a tertiary combustion chamber 16 above the secondary combustion chamber 15, and a gas cooling chamber 17 above the tertiary combustion chamber 16. The blower 11 for the secondary air is provided directly above the primary combustion chamber 14 of the furnace body 8. The cross section of the furnace body 8 near the tertiary combustion chamber 16 and the gas cooling chamber 17 is formed into a circular shape. As shown in FIG. 2, the wall surface of the furnace body 8 in the tertiary combustion chamber 16 has a blower for tertiary air. A plurality of tertiary air blowing nozzles 12 </ b> A to which air is sent from 12 are circumferentially provided at predetermined intervals. The blowing direction of each of the tertiary air blowing nozzles 12A is a predetermined inclination angle with respect to the wall surface of the furnace body 8 and the same inclination angle with respect to the tangential direction of the furnace body 8, It is designed to generate a swirl of secondary air.

【0015】そして、空気供給管18の1端は、ごみピ
ット19に接続され、その他端側は途中で分岐して、炉
体8の乾燥ストーカ5の下部8Aに接続する第1分岐管
18A、燃焼ストーカ6の下部8Bに接続する第2分岐
管18B、後燃焼ストーカ7の下部8Cに接続する第3
分岐管18Cを構成している。上記の空気供給管18の
途中には、風量調整ダンパ18Dと、1次空気用送風機
20と、1次空気温度調整ダンパ20Aとが設けられて
いる。第1分岐管18Aの途中には1次空気振分け第1
ダンパ21Aが、第2分岐管18Bの途中には1次空気
振分け第2ダンパ21Bが、第3分岐管18Cの途中に
は1次空気振分け第3ダンパ21Cがそれぞれ設けられ
ている。
Then, one end of the air supply pipe 18 is connected to the dust pit 19, and the other end side is branched midway to connect to the lower part 8A of the drying stoker 5 of the furnace body 8; The second branch pipe 18B connected to the lower portion 8B of the combustion stoker 6 and the third branch pipe 18B connected to the lower portion 8C of the post-combustion stoker 7.
It constitutes a branch pipe 18C. An air volume adjustment damper 18D, a primary air blower 20 and a primary air temperature adjustment damper 20A are provided in the middle of the air supply pipe 18 described above. In the middle of the first branch pipe 18A, the primary air distribution first
The damper 21A, the primary air distribution second damper 21B is provided in the middle of the second branch pipe 18B, and the primary air distribution third damper 21C is provided in the middle of the third branch pipe 18C.

【0016】また、上記の炉体8の排出口9には、排出
管22が接続され、その途中に空気予熱器23,電気集
塵器24が順番に介装されている。空気供給管18の1
次空気温度調整ダンパ20Aの両側部分には、空気予熱
器23を通る熱交換用空気管25,25が接続されてい
る。空気予熱器23を介して、排出管22中の排気ガス
と、熱交換用空気管25,25内の一次空気が熱交換さ
れ、空気供給管18内の一次空気が高温になるとともに
排出管22中の排気ガスが冷却される。
A discharge pipe 22 is connected to the discharge port 9 of the furnace body 8, and an air preheater 23 and an electrostatic precipitator 24 are provided in this order in the middle thereof. Air supply pipe 18-1
The heat exchange air pipes 25, 25 passing through the air preheater 23 are connected to both side portions of the next air temperature adjusting damper 20A. Exhaust gas in the exhaust pipe 22 and the primary air in the heat exchange air pipes 25, 25 are heat-exchanged with each other via the air preheater 23, and the temperature of the primary air in the air supply pipe 18 becomes high and the exhaust pipe 22 The exhaust gas inside is cooled.

【0017】しかして、本実施例においては、乾燥スト
ーカ5の下部8Aに、燃焼ストーカ6の下部8Bに、後
燃焼ストーカ7の下部8Cにそれぞれ高温の一次空気が
吹き込まれ、ごみ供給量,一次空気量制御により、乾燥
ストーカ5,燃焼ストーカ6,後燃焼ストーカ7上のご
みが安定燃焼されて排ガスが生成され、この排ガスは炉
体8内を上昇し、二次燃焼室15内に至る。
In the present embodiment, however, high temperature primary air is blown into the lower portion 8A of the dry stoker 5, the lower portion 8B of the combustion stoker 6, and the lower portion 8C of the post-combustion stoker 7, respectively, and the dust supply amount, By the air amount control, the dust on the dry stoker 5, the combustion stoker 6, and the post-combustion stoker 7 is stably burned to generate an exhaust gas, which rises in the furnace body 8 and reaches the secondary combustion chamber 15.

【0018】一方、2次空気用送風機11から空気予熱
器23を介して一次空気に対応した量の二次空気が、そ
の送風速度を適切な値にして、二次燃焼室15内に吹き
込まれ、二次燃焼室15内で、排ガス中の残留未燃ガス
との混合が促進される。ここで、二次空気の空気量は、
一次空気の空気量の約1/1.5とされている。また、
二次空気については、従来炉温冷却としての使用目的の
ため常温の空気が用いられていたのに対して、本実施例
においては、二次燃焼を主目的に二次空気を吹き込むの
で、二次空気も高温に設定され、二次燃焼をより効果的
にしている。
On the other hand, an amount of secondary air corresponding to the primary air is blown from the secondary air blower 11 through the air preheater 23 into the secondary combustion chamber 15 with an appropriate blowing speed. In the secondary combustion chamber 15, mixing with the residual unburned gas in the exhaust gas is promoted. Here, the amount of secondary air is
It is set to about 1 / 1.5 of the amount of primary air. Also,
Regarding the secondary air, air at room temperature has been conventionally used for the purpose of cooling the furnace, whereas in the present embodiment, the secondary air is blown mainly for the purpose of secondary combustion. The secondary air is also set to a high temperature, making secondary combustion more effective.

【0019】さらに、二次燃焼により生成された排ガス
は、一次燃焼により生成された排ガスとともに上昇し、
三次燃焼室16に至る。一方、三次空気用送風機12か
ら複数の三次空気吹込ノズル12Aを介して三次空気
が、その送風速度を適切な値にして、三次燃焼室16内
に吹き込まれ、三次燃焼室16内で、三次空気と、二次
燃焼によってもまだ燃焼していない排ガス中の残留未燃
ガスとの混合が促進される。この場合、三次空気は常温
とされ、排ガスに対する冷却をより効果的にしており、
また、複数の三次空気吹込ノズル12Aを介して炉体8
内へ常温の三次空気が渦巻くように吹き込まれるので、
三次空気と排ガス中の残留未燃ガスとの混合の促進を効
果的にしている。かかる状態で、三次燃焼室15にて、
三次燃焼が促進される。
Further, the exhaust gas produced by the secondary combustion rises together with the exhaust gas produced by the primary combustion,
It reaches the tertiary combustion chamber 16. On the other hand, the tertiary air is blown into the tertiary combustion chamber 16 from the tertiary air blower 12 through the plurality of tertiary air blowing nozzles 12A with an appropriate blowing speed, and the tertiary air is blown in the tertiary combustion chamber 16 in the tertiary combustion chamber 16. And the mixing with the residual unburned gas in the exhaust gas that has not yet been burned by the secondary combustion is promoted. In this case, the tertiary air is at room temperature, which makes the cooling of the exhaust gas more effective,
In addition, the furnace body 8 is inserted through the plurality of tertiary air blowing nozzles 12A.
Since the tertiary air at room temperature is blown into it,
It effectively promotes the mixing of the tertiary air and the residual unburned gas in the exhaust gas. In this state, in the tertiary combustion chamber 15,
The tertiary combustion is promoted.

【0020】そして、一次燃焼,二次燃焼,三次燃焼に
より生成された排ガスは、ガス冷却室17に導かれ、冷
却水供給口10から噴霧された冷却水により冷却され、
排出口9に導かれ、さらに、排出管22から空気予熱器
23を経て冷却され、電気集塵器24に至る。なお、炉
温上昇時の炉温の冷却操作は、ごみ送り量の操作によっ
て適切に制御されている。
Exhaust gas produced by the primary combustion, secondary combustion, and tertiary combustion is guided to the gas cooling chamber 17 and cooled by the cooling water sprayed from the cooling water supply port 10.
It is guided to the discharge port 9, further cooled from the discharge pipe 22 through the air preheater 23, and reaches the electric dust collector 24. In addition, the cooling operation of the furnace temperature when the furnace temperature rises is appropriately controlled by the operation of the amount of refuse feed.

【0021】以上の如き構成によれば、排ガス中の残留
未燃ガスとの混合を促進するように一次空気に対応した
量の二次空気が炉体8内に供給されるので、一次燃焼で
生成された排ガス中の残留未燃ガスの二次燃焼を促進
し、従って、排ガス中の未燃ガスの残存率を少なくして
ごみをより完全燃焼させることができる。
According to the above-mentioned structure, the secondary air is supplied into the furnace body 8 in an amount corresponding to the primary air so as to promote the mixing with the residual unburned gas in the exhaust gas. The secondary combustion of the residual unburned gas in the generated exhaust gas can be promoted, and thus the residual rate of the unburned gas in the exhaust gas can be reduced and the dust can be burned more completely.

【0022】特に、炉温低下時にも、二次空気が吹き込
まれ、二次空気の供給量が一次空気量に対して対応した
量となるので、二次空気の量が不足することなく、或い
は、混合用としての二次空気の風速を得ることができ、
完全燃焼の達成に近くなり、例えば、CO濃度を低減す
ることができる。
Particularly, even when the furnace temperature is lowered, the secondary air is blown in, and the supply amount of the secondary air corresponds to the primary air amount, so that the secondary air amount does not become insufficient, or , Can obtain the wind speed of the secondary air for mixing,
It is close to achieving complete combustion, for example, the CO concentration can be reduced.

【0023】そして、一次燃焼で生成された排ガス中の
残留未燃ガスを二次燃焼し、さらに、二次燃焼後の排ガ
ス温度は、約800℃〜900℃となるため、二次燃焼
した排ガス中に、三次空気を送り込み、再混合すること
により、排ガス中の残留未燃ガスを再燃させることがで
きる。従って、排ガス中の未燃ガスの残存率を少なくし
てごみをより完全燃焼させることができる。
Then, the residual unburned gas in the exhaust gas produced in the primary combustion is secondarily combusted, and the exhaust gas temperature after the secondary combustion is about 800 ° C. to 900 ° C. The residual unburned gas in the exhaust gas can be reburned by sending tertiary air into it and remixing it. Therefore, it is possible to reduce the remaining rate of unburned gas in the exhaust gas and burn the dust more completely.

【0024】しかも、二次燃焼した排ガス中に残留未燃
ガスがほぼ無くなったとしても、三次空気吹き込みによ
る冷却効果を得ることができる。従って、炉体8のガス
冷却室17への冷却水の供給量を低減し、排ガス中の水
分を低減し、ごみ焼却炉1から排出される白煙の量を少
なくすることができる。
Moreover, even if the residual unburned gas is almost eliminated in the exhaust gas that has undergone secondary combustion, the cooling effect by blowing in the tertiary air can be obtained. Therefore, the amount of cooling water supplied to the gas cooling chamber 17 of the furnace body 8 can be reduced, the moisture in the exhaust gas can be reduced, and the amount of white smoke discharged from the refuse incinerator 1 can be reduced.

【0025】さらに、ダイオキシン対策として、例え
ば、既設のごみ焼却炉においても、炉体8の排出管22
の途中に設けた電気集塵器24の入口の排ガス温度を約
300℃に設備設計した場合、これより低い例えば25
0℃〜280℃の目標値に制御しようとすれば、ガス冷
却室17の容量や冷却水供給口10等からなる冷却水噴
霧設備の改修が必要となる場合が多い。
Further, as a measure against dioxin, for example, even in an existing refuse incinerator, the discharge pipe 22 of the furnace body 8
When the exhaust gas temperature at the entrance of the electrostatic precipitator 24 provided in the middle of
In order to control to a target value of 0 ° C. to 280 ° C., it is often necessary to repair the capacity of the gas cooling chamber 17 and the cooling water spray equipment including the cooling water supply port 10 and the like.

【0026】このような既設のごみ焼却炉においても、
前述の二次空気供給とともに三次空気供給を図ることに
より、ごみ焼却炉の全体としての冷却能力を向上させ、
ガス冷却室17の容量や冷却水噴霧設備の改修をしない
で、排ガス温度の冷却目標値を達成することができる。
Even in such an existing refuse incinerator,
By increasing the secondary air supply as well as the tertiary air supply, the overall cooling capacity of the refuse incinerator is improved,
The cooling target value of the exhaust gas temperature can be achieved without modifying the capacity of the gas cooling chamber 17 or the cooling water spray equipment.

【0027】なお、本実施例においては、二次空気は一
次空気に対応した量となっていれば良く、二次空気の空
気量は、一次空気の空気量の約1/1.5とされている
が、この数値に限定されず、二次空気の空気量を、一次
空気の空気量に対して適切な他の数値の割合で比例させ
ることもでき、また、二次空気の空気量を、一次空気の
空気量に対して適切な関数関係にすることもできる。
In this embodiment, the amount of secondary air should be the amount corresponding to the primary air, and the amount of secondary air is about 1 / 1.5 of the amount of primary air. However, the air amount of the secondary air is not limited to this value, and the air amount of the secondary air can be proportional to the air amount of the primary air by another appropriate ratio. , It is also possible to have an appropriate functional relationship with the amount of primary air.

【0028】[0028]

【発明の効果】以上説明したように、本発明によれば、
排ガス中の残留未燃ガスとの混合を促進するように一次
空気に対応した量の二次空気が炉体内に供給されるの
で、一次燃焼で生成された排ガス中の残留未燃ガスの二
次燃焼を促進し、従って、排ガス中の未燃ガスの残存率
を少なくしてごみをより完全燃焼させることができる。
As described above, according to the present invention,
Secondary air is supplied to the furnace body in an amount corresponding to the primary air so as to promote mixing with the residual unburned gas in the exhaust gas. The combustion can be promoted, and therefore, the residual rate of unburned gas in the exhaust gas can be reduced and the dust can be burned more completely.

【0029】特に、炉温低下時にも、二次空気が吹き込
まれ、二次空気の供給量が一次空気量に対して対応した
量となるので、二次空気の量が不足することなく、或い
は、混合用としての二次空気の風速を得ることができ、
完全燃焼の達成に近くなり、例えば、CO濃度を低減す
ることができる。
Particularly, even when the furnace temperature is lowered, the secondary air is blown in, and the supply amount of the secondary air corresponds to the amount of the primary air, so that the amount of the secondary air does not become insufficient, or , Can obtain the wind speed of the secondary air for mixing,
It is close to achieving complete combustion, for example, the CO concentration can be reduced.

【0030】そして、一次燃焼で生成された排ガス中の
残留未燃ガスを二次燃焼し、さらに、二次燃焼した排ガ
ス中に、三次空気を送り込み、再混合することにより、
排ガス中の残留未燃ガスを再燃させることができる。従
って、排ガス中の未燃ガスの残存率を少なくしてごみを
より完全燃焼させることができる。
Then, the residual unburned gas in the exhaust gas produced in the primary combustion is secondarily combusted, and the tertiary air is fed into the exhaust gas which has been secondarily combusted to remix it.
It is possible to reburn the residual unburned gas in the exhaust gas. Therefore, it is possible to reduce the remaining rate of unburned gas in the exhaust gas and burn the dust more completely.

【0031】しかも、二次燃焼した排ガス中に残留未燃
ガスがほぼ無くなったとしても、三次空気吹き込みによ
る冷却効果を得ることができる。従って、炉体のガス冷
却室からの冷却水の供給量を低減し、排ガス中の水分を
低減し、ごみ焼却炉から排出される白煙の量を少なくす
ることができる効果を奏する。
Moreover, even if the residual unburned gas is almost eliminated from the secondary combustion exhaust gas, it is possible to obtain the cooling effect by blowing the tertiary air. Therefore, it is possible to reduce the amount of cooling water supplied from the gas cooling chamber of the furnace body, reduce the water content in the exhaust gas, and reduce the amount of white smoke discharged from the refuse incinerator.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例に係わるごみ焼却炉の構成図で
ある。
FIG. 1 is a configuration diagram of a refuse incinerator according to an embodiment of the present invention.

【図2】図1の炉体の三次空気吹込ノズルを示す炉体の
断面図である。
FIG. 2 is a sectional view of the furnace body showing a tertiary air blowing nozzle of the furnace body of FIG.

【符号の説明】[Explanation of symbols]

1 ごみ焼却炉 5 乾燥ストーカ 6 燃焼ストーカ 7 後燃焼ストーカ 8 炉体 1 Waste incinerator 5 Dry stoker 6 Combustion stoker 7 Post-combustion stoker 8 Furnace body

Claims (1)

【特許請求の範囲】 【請求項1】 ごみ焼却炉のストーカに一次空気を供給
してごみを燃焼をさせ、排ガスを炉体に導くごみ焼却炉
のごみ燃焼方法において、 排ガス中の残留未燃ガスとの混合を促進するように一次
空気に対応した量の二次空気を炉体内に供給し、 さらに、所定の量の三次空気を、排ガス中の残留未燃ガ
スと再混合を促進するように炉体内に供給することを特
徴とするごみ焼却炉のごみ燃焼方法。
What is claimed is: 1. A method for incinerating waste in an incinerator, wherein primary air is supplied to a stoker in an incinerator to burn the waste and introduce the exhaust gas into a furnace body. Supply secondary air in an amount corresponding to the primary air into the furnace to promote mixing with the gas, and further promote a predetermined amount of tertiary air to re-mix with residual unburned gas in the exhaust gas. A method for burning waste in a refuse incinerator, which is characterized in that it is supplied into the furnace body.
JP17966091A 1991-07-19 1991-07-19 Refuse combustion method in dust incinerator Pending JPH0526421A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17966091A JPH0526421A (en) 1991-07-19 1991-07-19 Refuse combustion method in dust incinerator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17966091A JPH0526421A (en) 1991-07-19 1991-07-19 Refuse combustion method in dust incinerator

Publications (1)

Publication Number Publication Date
JPH0526421A true JPH0526421A (en) 1993-02-02

Family

ID=16069657

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17966091A Pending JPH0526421A (en) 1991-07-19 1991-07-19 Refuse combustion method in dust incinerator

Country Status (1)

Country Link
JP (1) JPH0526421A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997049953A1 (en) * 1996-06-25 1997-12-31 Ebara Corporation Method for fusion treating a solid waste for gasification
US6938561B1 (en) * 1999-08-30 2005-09-06 Von Roll Umwelttechnik Ag Device for producing a rotating flow
JP2007127355A (en) * 2005-11-04 2007-05-24 Takuma Co Ltd Rubbish incinerating/melting method and device therefor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4845076A (en) * 1971-10-08 1973-06-28
JPS5211664A (en) * 1975-06-24 1977-01-28 Sadao Kamimura Dust incineration furnace
JPS56100221A (en) * 1980-01-14 1981-08-12 Kawasaki Heavy Ind Ltd Method and device for nitrogen oxide controlling combustion in incinerator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4845076A (en) * 1971-10-08 1973-06-28
JPS5211664A (en) * 1975-06-24 1977-01-28 Sadao Kamimura Dust incineration furnace
JPS56100221A (en) * 1980-01-14 1981-08-12 Kawasaki Heavy Ind Ltd Method and device for nitrogen oxide controlling combustion in incinerator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997049953A1 (en) * 1996-06-25 1997-12-31 Ebara Corporation Method for fusion treating a solid waste for gasification
US6168425B1 (en) 1996-06-25 2001-01-02 Ebara Corporation Method for fusion treating a solid waste for gasification
US6938561B1 (en) * 1999-08-30 2005-09-06 Von Roll Umwelttechnik Ag Device for producing a rotating flow
JP2007127355A (en) * 2005-11-04 2007-05-24 Takuma Co Ltd Rubbish incinerating/melting method and device therefor

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