JPS61180825A - Operation of incinerator - Google Patents

Operation of incinerator

Info

Publication number
JPS61180825A
JPS61180825A JP2218285A JP2218285A JPS61180825A JP S61180825 A JPS61180825 A JP S61180825A JP 2218285 A JP2218285 A JP 2218285A JP 2218285 A JP2218285 A JP 2218285A JP S61180825 A JPS61180825 A JP S61180825A
Authority
JP
Japan
Prior art keywords
exhaust gas
combustion
fresh air
duct
mixed
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
JP2218285A
Other languages
Japanese (ja)
Inventor
Noboru Yoshino
昇 吉野
Eiroku Kamiyama
神山 栄六
Yoshiaki Sedo
瀬藤 嘉章
Masafumi Aikawa
相川 雅文
Yasujiro Wakamura
若村 保二郎
Arihiro Nakazato
中里 有宏
Yoshitada Tsunoda
芳忠 角田
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.)
TOKYO MET GOV
Takuma Co Ltd
Hitachi Zosen Corp
Tokyo Metropolitan Government
Original Assignee
TOKYO MET GOV
Takuma Co Ltd
Hitachi Zosen Corp
Tokyo Metropolitan Government
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 TOKYO MET GOV, Takuma Co Ltd, Hitachi Zosen Corp, Tokyo Metropolitan Government filed Critical TOKYO MET GOV
Priority to JP2218285A priority Critical patent/JPS61180825A/en
Publication of JPS61180825A publication Critical patent/JPS61180825A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/006General arrangement of incineration plant, e.g. flow sheets

Landscapes

  • Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

PURPOSE:To reduce a concentration of nitrogen oxide in burnt exhaust gas by controlling a mixed ratio of burnt exhaust gas to a fresh air with judgement on oxygen concentration of mixed gas of burnt exhaust gas and a fresh air. CONSTITUTION:A fresh air necessary for burning is sucked in from a waste pit 15 and heated up to about 150 deg.C by a steam type air preheater 18 via a primary duct 19 and then to about 230 deg.C by a gas type preheater 9. The heated fresh air is supplied to hoppers 10-14 from supply parts 34-38 under fire grates 4-6 via a secondary duct 23 and each supply duct 29-33. When burnt exhaust gas is not mixed with a fresh air at a constant ratio, burning is checked. As a counter measure for this, a mixed ratio of burnt gas to fresh air is controlled in order that mixed oxygen concentration of oxygen concentrations in fresh air and burnt exhaust gas may not be kept under an index value (18%).

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、ごみ焼却炉に2ける燃焼排ガス中の窒素酸化
物(以下、NOxという)の濃度を低減させるために、
燃焼排ガスの一部をごみ焼却炉内Iζ循環させるごみ焼
却炉の運転方法に関するものである。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for reducing the concentration of nitrogen oxides (hereinafter referred to as NOx) in the combustion exhaust gas of a waste incinerator.
This invention relates to a method of operating a waste incinerator in which a portion of combustion exhaust gas is circulated within the waste incinerator.

従来の技術 ごみ焼却炉に奢いて排ガス中のNOx濃度を低減するた
めには、排ガス中の酸素濃度を低減させればそれに伴い
NOx濃度も低減Tることが判明している。このことは
、火格子下から供給する燃焼用空気量を少な(して、す
なわち空気過剰率を低く・することにより達成される。
Conventional Technology In order to reduce the NOx concentration in the exhaust gas in a waste incinerator, it has been found that if the oxygen concentration in the exhaust gas is reduced, the NOx concentration will also be reduced accordingly. This is achieved by reducing the amount of combustion air supplied from below the grate, i.e. by reducing the excess air ratio.

ところが空気過剰率を低くすると炉内温度が上昇し、ご
み焼却炉のレンガ壁に付着するクリンカーの量が多(な
り、ごみ焼却炉の運転に支障をきたすことになる。この
対策として、ごみ焼却炉に水あるいは蒸気などを噴霧し
て、炉内温度が規定の温度以上にならないようにしてい
る。この方式では、水のランニングコストがかさむこと
になり、さらにレンガ壁に水がかかることによりレンガ
に悪影響を及ぼすなどの問題がある。これに対して、温
度が低(かつ酸素濃度の低い燃焼排ガスの一部を煙突の
手前から抜き出し、ごみ焼却炉内に循環させる方式が考
えられている。
However, if the excess air ratio is lowered, the temperature inside the furnace will rise, and a large amount of clinker will adhere to the brick walls of the waste incinerator, which will impede the operation of the waste incinerator. Water or steam is sprayed into the furnace to prevent the temperature inside the furnace from exceeding a specified temperature.This method increases the running cost of water, and also causes the brick walls to become damaged due to water being sprayed onto the brick walls. To address this problem, a method is being considered in which a portion of the combustion exhaust gas, which has a low temperature (and low oxygen concentration), is extracted from the front of the chimney and circulated within the waste incinerator.

発明が解決しようとする問題点 しかし燃焼排ガス循環方式は、燃焼排ガス中の塩化水素
(以下、H(Jという)や硫黄酸化物(以下、 SOx
という)によって塩酸や硫酸が結露して。
Problems to be Solved by the Invention However, the combustion exhaust gas circulation system does not eliminate hydrogen chloride (hereinafter referred to as H (hereinafter referred to as J)) and sulfur oxides (hereinafter referred to as SOx) in the combustion exhaust gas.
), hydrochloric acid and sulfuric acid condense.

火格子の腐食などが生じることから、実際には行なわれ
ていなかった。
This was not actually done because it would cause corrosion of the fire grate.

問題を解決するための手段 上記問題点を解決すべく本発明にあけるごみ焼却炉の運
転方法は、乾燥、燃焼、後燃焼と燃焼区分があり、燃焼
用空気の予熱器を有するごみ焼却炉において、燃焼排ガ
スの一部と燃焼用の新鮮空気とを混合して、燃焼火格子
下ホッパおよび後燃焼火格子下ホッパに供給し、その際
に新鮮空気に対する燃焼排ガスの混合割合を、新鮮空気
中の酸素濃度と燃焼排ガス中の酸素濃度の混合濃度で判
断し制御している。
Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a method for operating a waste incinerator, which includes drying, combustion, and post-combustion, and is equipped with a combustion air preheater. , a part of the combustion exhaust gas and fresh air for combustion are mixed and supplied to the hopper under the combustion grate and the hopper under the post-combustion grate, and at this time, the mixing ratio of the combustion exhaust gas to the fresh air is adjusted to It is determined and controlled based on the mixed concentration of the oxygen concentration in the combustion exhaust gas and the oxygen concentration in the combustion exhaust gas.

作用 かかる本発明構成によると、燃焼用の新鮮空気を予熱器
に通すことによって200℃以上にあげ、且つ燃焼排ガ
スの温度も230℃前後まで下がっているので1両ホッ
パ内で新鮮空気と燃焼排ガスを混合させても、燃焼排ガ
ス中の有害成分が結露することがなく、これら新鮮空気
と燃焼排ガスとを両ホッパ内で混合させて、燃焼用空気
として火格子下から炉内に送入し得る。その際に、新鮮
空気に対し成る一定の割合で燃焼排ガスを混合しなけれ
ば燃焼が阻害されることになる。これに対しては、新鮮
空気中の酸素濃度と燃焼排ガス中の酸素濃度の混合酸素
濃度が指標値(18%)以下にならないように、新鮮空
気に対する燃焼排ガスの混合割合を制御している。
Effects According to the structure of the present invention, the fresh air for combustion is passed through the preheater to raise the temperature to 200°C or higher, and the temperature of the combustion exhaust gas is also lowered to around 230°C, so that the fresh air and the combustion exhaust gas are heated in one hopper. Even when mixed, the harmful components in the combustion exhaust gas do not condense, and the fresh air and combustion exhaust gas can be mixed in both hoppers and sent into the furnace from under the grate as combustion air. . At this time, combustion will be inhibited unless the combustion exhaust gas is mixed with fresh air at a certain ratio. To deal with this, the mixing ratio of the combustion exhaust gas to the fresh air is controlled so that the mixed oxygen concentration of the oxygen concentration in the fresh air and the oxygen concentration in the combustion exhaust gas does not become less than the index value (18%).

実施例 以下に本発明の一実施例を図面に基づいて説明する。ご
み焼却炉(1)は、炉本体(2)、投入ホッパ(3)。
EXAMPLE An example of the present invention will be described below based on the drawings. The garbage incinerator (1) consists of a furnace body (2) and an input hopper (3).

乾燥火格子(4)、燃焼火格子(5)、後燃焼火格子(
6)。
Dry grate (4), combustion grate (5), post-combustion grate (
6).

主灰シュー) (7)、排熱ボイラ(8)、ガス式空気
加熱器(9)、各火格子(4) (5) (6)の下に
設けたホッパαOQl) (12(至)α尋などにより
構成される。ごみビット(至)に吸込口が連通ずる押込
通風機α・の吐出口には、ダンパ(ロ)と蒸気式空気予
熱器(至)とを介在した第1ダクト(至)が連通し、こ
のlitダクトα傷は前記ガス式空気加熱器(9)に達
する。前記第1ダク) Qlからの分岐ダクト(ホ)と
、前記ガス式空気加熱器(9)からの取出しダクト(2
)とは1両接続部間にダンパ(支)を介在した第2ダク
ト(2)に接続する。この第2ダクト(イ)からは、夫
々ダンパcI4@(1)(ロ)(2)を介在した複数の
供給ダク)cnmen@nが分岐され、これら供給ダク
ト四〜(至)はホッパαO〜α→内の供給部lA(至)
(至)(ロ)−に連通ずる。燃焼排ガスを排出するため
にガス式空気加熱器(9)に連通ずる第1排ガスダクト
(至)は、ダンパ■を介在した状態で電気集じん器(財
)に連通し、また電気集じん器(ロ)からの第2排ガス
ダクト−は。
Bottom ash shoe) (7), exhaust heat boiler (8), gas air heater (9), hopper αOQl installed under each grate (4) (5) (6)) (12 (to) α A first duct (with a damper (b) and a steam-type air preheater (b) interposed in the discharge port of the forced draft fan α, whose suction port communicates with the garbage bit (b) ) are connected, and this lit duct α damage reaches the gas air heater (9).The branch duct (e) from the first duct) Ql and the gas air heater (9) Takeout duct (2
) is connected to the second duct (2) with a damper (support) interposed between the two connecting parts. From this second duct (a), a plurality of supply ducts)cnmen@n are branched through dampers cI4@(1), (b), and (2), respectively, and these supply ducts 4~(to) are connected to hoppers αO~ Supply section lA (to) in α→
(To) (B) Connects to -. The first exhaust gas duct (to), which communicates with the gas air heater (9) for discharging combustion exhaust gas, communicates with the electrostatic precipitator (Foundation) with a damper interposed, and also connects with the electrostatic precipitator. The second exhaust gas duct from (b) is.

ダンパーと誘引通風機−を介在した状態で煙突(ハ)に
連通している。前記第1排ガスダクト(2)におけるダ
ンパ(ト)の上流と、第2排ガスダクトに)における誘
引通風機−の下流との間にバイパスダクトに)が設けら
れ、このバイパスダクト−内には2個のダンパ@−が介
在される。■はごみピット(至)に吸込口が連通ずる炉
温制御用送風機で、その吐出口に連通し且つダンパ■を
介在した第3ダクト6pの道端は炉上部に設けた炉冷却
空気送入ローに連通する。前記バイパスダクト−の中間
で且つ両ダンパ(47)(ハ)間からは排ガス循環ダク
ト(至)が分岐され。
It communicates with the chimney (C) through a damper and induced draft fan. A bypass duct is provided between the upstream of the damper in the first exhaust gas duct (2) and the downstream of the induced draft fan in the second exhaust gas duct. Dampers @- are interposed. ■ is a blower for furnace temperature control whose suction port communicates with the garbage pit (toward), and the end of the third duct 6p, which communicates with its discharge port and has a damper ■ interposed, is connected to the furnace cooling air supply roller installed in the upper part of the furnace. communicate with. An exhaust gas circulation duct (to) branches off from the middle of the bypass duct and between both dampers (47) (c).

この排ガス循環ダクト(至)にはダンパ輪と排ガス再循
環ファン−とが介在される。前記排ガス循環ダクト匈か
らは5本(複数本)の排ガス供給ダクトt46I@H−
が分岐され、これら排ガス供給ダクト(至)〜■中には
ダンパーーーーーが介在される。2本の排ガス供給ダク
ト−団は、燃焼火格子側ホッパ@(至)に対応する供給
ダクト61)(2)に対して、ダンパCA@の下流で接
続している。また1本の排ガス供給ダクト(財)は、後
燃焼火格子側ホッパαIに対応する供給ダクト(至)に
対して、ダンパ(ホ)の下流で接続している。さらに1
本の排ガス供給ダクト圀は前記主灰シュート(7)の上
部に開放している。また残り1本の排ガス供給ダクト−
は前記炉冷却空気送入ローに連通している。燃焼火格子
(5)と後燃焼火格子(6)のホッパd (Ll (1
41に対応する供給ダクトc(υ@(至)には、夫々ダ
ンパ(ホ)@(ハ)の上手における新鮮空気中の酸素濃
度を検出する酸素濃度計e4@−が設けられ、それに対
応して夫々コントローラaI(至)(ハ)が設けられる
。そして同様にコントローラー+7G(ハ)に対応して
、排ガス供給ダクトMM671のダンパv3轢l)−の
上手における排ガス中の酸素濃度を検出する酸素濃度計
Q’ij FJシ尋が設けらtLる。さらに煙突(ト)
の入口における排ガス中の酸素濃度を検出する酸素濃度
計Q0が設けられる。
A damper wheel and an exhaust gas recirculation fan are interposed in this exhaust gas circulation duct. Five (multiple) exhaust gas supply ducts t46I@H- are connected to the exhaust gas circulation duct.
The exhaust gas supply ducts are branched, and dampers are interposed in these exhaust gas supply ducts. The two exhaust gas supply duct groups are connected downstream of the damper CA@ to the supply duct 61) (2) corresponding to the combustion grate side hopper @ (to). Further, one exhaust gas supply duct (F) is connected downstream of the damper (E) to a supply duct (T) corresponding to the after-combustion grate side hopper αI. 1 more
The main exhaust gas supply duct is open at the top of the bottom ash chute (7). There is also one remaining exhaust gas supply duct.
is in communication with the furnace cooling air feed row. Hopper d (Ll (1) of combustion grate (5) and after-combustion grate (6)
The supply duct c (υ@(to)) corresponding to 41 is provided with an oxygen concentration meter e4@- for detecting the oxygen concentration in the fresh air at the top of the damper (E) @(C), respectively. Similarly, corresponding to the controller +7G (c), an oxygen controller is provided for detecting the oxygen concentration in the exhaust gas at the top of the damper v3 (l)- of the exhaust gas supply duct MM671. A densitometer Q'ij FJ is installed. Furthermore chimney (g)
An oxygen concentration meter Q0 is provided to detect the oxygen concentration in the exhaust gas at the inlet of the exhaust gas.

以下に上記実施例の作用を説明する。クレーンにより投
入ホッパ(3)に投入されたごみは、先ず乾燥火格子(
4)で乾燥さn、燃焼火格子(5)で大部分が焼却さn
たのち、後燃焼火格子(6)で更に完全に燃焼される。
The operation of the above embodiment will be explained below. The garbage loaded into the input hopper (3) by the crane is first placed on a drying grate (
4) and mostly incinerated in the combustion grate (5).
Thereafter, it is further burnt completely in the post-combustion grate (6).

焼却灰は、主灰シュート(7)を3通って灰冷却水槽な
どで処理されたのち、埋立処分される。
The incinerated ash passes through three bottom ash chutes (7), is treated in an ash cooling water tank, etc., and then is disposed of in a landfill.

燃焼に必要な新鮮空気は、押込通風機叫によりごみピッ
ト四から吸引して第1ダクトC1lを通り、そして蒸気
式空気予熱器(至)で約150℃まで加熱されたのちガ
ス式空気加熱器(9)で更に約280°Cまで加熱され
る。この加熱新鮮空気は、第2ダクト@と各供給ダクト
ー〜端とを介して、供給部(ロ)〜■からホッパuO〜
α尋内に、すなわち火格子(4)〜(6)下に供給さn
る。一方、燃焼排ガスは排熱ボイラ(8)で熱量が吸収
され、第1排ガスダクト(至)を通して電気業じん器■
に供給され、この電気業じん器的で排ガス中に含まれて
いるダストが捕集されたのち第2排ガスダクト(6)を
通り、煙突(転)から大気へ放散される。
The fresh air necessary for combustion is sucked from garbage pit 4 by a forced draft fan, passes through the first duct C1l, and is heated to approximately 150°C in a steam-type air preheater (toward) before being transferred to a gas-type air heater. In step (9), it is further heated to about 280°C. This heated fresh air is passed from the supply section (b) to the hopper uO through the second duct @ and the end of each supply duct.
n supplied within α fathom, i.e. below the grates (4) to (6)
Ru. On the other hand, the heat of the combustion exhaust gas is absorbed by the exhaust heat boiler (8), and then passed through the first exhaust gas duct (toward) to the electric industrial
After the dust contained in the exhaust gas from this electric industrial dust is collected, it passes through the second exhaust gas duct (6) and is dissipated into the atmosphere from the chimney.

以上が通常の運転であるが、ごみ焼却炉(1)の始動、
停止時には排ガスの温度が低いため、ダンパ(イ)を閉
にしておく。すると排ガスは、第1排ガスダクト(至)
からバイパスダクト−を流れ、そして第2排ガスダクト
(転)から煙突−を通って大気中へ放散される。
The above is normal operation, but starting the garbage incinerator (1),
When the engine is stopped, the temperature of the exhaust gas is low, so keep the damper (a) closed. Then, the exhaust gas flows to the first exhaust gas duct (towards)
The exhaust gas flows through the bypass duct and is dissipated into the atmosphere from the second exhaust gas duct through the chimney.

運転中において燃料排ガス中のNOx濃度の低減は、第
1ダクトQl中のダンパα力を絞り、押込通風機(至)
からの風量を削減することにより達成されるが、尤の場
合に炉上部温度が上がり且つ排ガス中ノ未燃成分、が増
加、することになる。これに対しては、炉温制御用送風
機−により新鮮な空気を送ることによって、炉上部温度
を下げることができ、排ガス中の未燃成分も再燃焼して
大気中に放散される有害成分も少なくなる。その反面、
炉温制御用送風機−からの新鮮な空気中の酸素が排ガス
中の酸素濃度を増やすことになり、それに伴ってNOx
 濃度がとがる。これに対しては、バイパスダクト−の
ダンパ97)を閉じると共にダンパーを開けて、電気業
じん器■を出て第2排ガスダクト(6)を流れる02濃
度の低い排ガスの一部を煙突−へ入る手前からバイパス
ダクト■に抜き出し、このバイパスダクト■内を逆流さ
せたのち排ガス循環ダクト−へと流す。この排ガス循環
ダクト鴫内の排ガスは、排ガス供給ダクト帽1ηを介し
て燃焼人格又 子(5)と後燃焼い格子(6)に対応するホッパd (
13(141に循環供給され、ここで新鮮空気と混合さ
れてごみを焼却することになる。さらに排ガスダクト@
−を介して、炉温制御用送風機■の炉冷却空気送入口%
42よび主灰シュート(7)の上部からも排ガスを循環
供給させれば、炉上部温度も下がり、 NOx濃度−も
低減できる。
During operation, the NOx concentration in fuel exhaust gas can be reduced by reducing the damper α force in the first duct Ql, and by
This can be achieved by reducing the amount of air from the furnace, but in most cases the temperature at the upper part of the furnace will rise and the amount of unburned components in the exhaust gas will increase. To counter this, by sending fresh air using a furnace temperature control blower, the temperature at the top of the furnace can be lowered, and the unburned components in the exhaust gas can be re-burned, reducing harmful components that are released into the atmosphere. It becomes less. On the other hand,
Oxygen in the fresh air from the furnace temperature control blower increases the oxygen concentration in the exhaust gas, which in turn increases NOx.
The concentration is sharp. To deal with this, close the damper 97) of the bypass duct and open the damper to direct some of the low-concentration 02 exhaust gas that exits the electric industrial dust generator ■ and flows through the second exhaust gas duct (6) to the chimney. It is extracted from the side before entering the bypass duct (■), and after flowing backward through the bypass duct (■), it flows into the exhaust gas circulation duct. The exhaust gas in this exhaust gas circulation duct is passed through the exhaust gas supply duct cap 1η to the hopper d(
13 (141), where it is mixed with fresh air and the waste is incinerated.Furthermore, the exhaust gas duct @
- Through the furnace cooling air inlet of the blower for furnace temperature control %
If exhaust gas is circulated and supplied from the upper part of the bottom ash chute (7) and the bottom ash chute (7), the temperature in the upper part of the furnace can be lowered and the NOx concentration can also be reduced.

ここで乾燥火格子(4)下のホッパα□Ql)に排ガス
を循環させない理由は、この乾燥火格子(4)下の雰囲
気温度が低いため、排ガスを循環させると排ガス中のH
Cノ、SOxなどが結露して、火格子および火格子梁な
どの腐食の原因となるからである。これに対し燃焼火格
子(5)下、詔よび後燃焼火格子(6)下は雰囲気温度
が高く、且つ押込通風機(11からの空気は約280℃
であり、排ガス温度もこれと同程度い。
The reason why the exhaust gas is not circulated to the hopper α□Ql) under the drying grate (4) is that the atmospheric temperature under the drying grate (4) is low, so if the exhaust gas is circulated, the H
This is because carbon dioxide, SOx, etc. may condense and cause corrosion of the grate and grate beams. On the other hand, the ambient temperature is high under the combustion grate (5) and under the post-combustion grate (6), and the air from the forced draft fan (11) is approximately 280℃.
The exhaust gas temperature is also about the same.

前述したように通常運転時には、燃焼火格子下ホッパU
a3、後燃焼火格子下ホッパ0からは、押込送風機a!
からの新鮮空気が供給されるのに対し、NOx濃度低減
のための排ガスを新鮮空気と混合して置火格子(5)(
6)下から送入する。このとき、新鮮空気に対し排ガス
の混合割合を多くすればするほど燃焼を阻害するので1
次のごとく混合後の燃焼用空気中の酸素濃度を成る一定
の割合(18%)以上に保って、排ガスを各火格子(5
) (6)下から送入する。
As mentioned above, during normal operation, the hopper U under the combustion grate
a3, from hopper 0 under the post-combustion grate, forced air blower a!
While fresh air is supplied from the fire grate (5) (
6) Feed from the bottom. At this time, the higher the mixing ratio of exhaust gas to fresh air, the more the combustion will be inhibited.
As shown below, the oxygen concentration in the combustion air after mixing is kept above a certain percentage (18%), and the exhaust gas is
) (6) Feed from the bottom.

すなわち1例えば第1図においてホッパ(2)に供給さ
れる新鮮空気量をCXNtd/L )、排ガス量を(Y
 Nnf/JL )とすると、ホッパ(2)内での混合
酸素濃度は次のようになる。新鮮空気中の酸素量は濃度
を21%として 0.21 X X Hm’/J 排ガス中の酸素量は濃度をa%として −L−x Y wtd /1 ここで排ガスの08%は煙突−の入口に設けた酸素濃度
計り篩の指示値a%を用いる。よって混合燃焼空気量中
の酸素濃度は 実炉を用いた実験結果では(h=18%〕であった。
For example, in Fig. 1, the amount of fresh air supplied to the hopper (2) is CXNtd/L), and the amount of exhaust gas is (Y
Nnf/JL), the mixed oxygen concentration in the hopper (2) is as follows. The amount of oxygen in fresh air is 0.21 X The indicated value a% of the oxygen concentration meter sieve provided at the inlet is used. Therefore, the oxygen concentration in the mixed combustion air amount was (h=18%) in the experimental results using an actual furnace.

また実炉を用いた実施例は表−1に示すとおりである。Examples using an actual furnace are shown in Table 1.

以  下  金  白 表−1 実際の運転は、火格子上空気1i X (Nm’/&)
と排ガス酸素濃度a(%)より、あらかじめ設定した混
合燃焼空気の酸素濃度b(%)となるように排ガス量Y
 (Nm’/j )を制御する。排ガス量Yは次式で表
わされる。
The following Gold White Table-1 In actual operation, air above the grate 1i X (Nm'/&)
From the exhaust gas oxygen concentration a (%), the exhaust gas amount Y is adjusted so that the oxygen concentration b (%) of the mixed combustion air is set in advance.
(Nm'/j). The exhaust gas amount Y is expressed by the following formula.

各火格子下ホッパ@(至)α→に供給される空気量、酸
素濃度計ケ0で検出される排ガス酸素濃度、および設定
した混合燃焼空気の酸素濃度により面式を用いて計算さ
れる送入排ガス量となるように、コントローラt*f*
(ハ)からの指示により各ダンパII −四を制御する
The amount of air supplied to each under-grate hopper @ (to) The controller t*f*
Each damper II-4 is controlled according to instructions from (c).

第2図は、排ガスを循環させる前と、排ガスの循環を実
施したときとのNOx濃度の比較を示している。
FIG. 2 shows a comparison of the NOx concentration before circulating the exhaust gas and when circulating the exhaust gas.

発明の効果。Effect of the invention.

上記構成の本発明によると、燃焼用の新鮮空気を予熱器
に通すことによって200℃以上にあげ。
According to the present invention having the above configuration, fresh air for combustion is heated to 200° C. or higher by passing it through a preheater.

且つ燃焼排ガスの温度も230℃前後まで下がっている
ので、両ホッパ内で新鮮空気と燃焼排ガスを混合させて
も、燃焼排ガス中の有害成分が結露することがなく、シ
たがって、これら新鮮空気と燃焼排ガスとを両ホッパ内
で混合させて、燃焼用空気として火格子下から炉内に送
入することができる。その際に、新鮮空気に対し成る一
定の割合で燃焼排ガスを混合しなければ燃焼が阻害され
ることになるが、これに対しては、新鮮空気中の酸素濃
度と燃焼排ガス中の酸素濃度の混合酸素濃度が指標値(
18%)以下にならないように、新鮮空気に対する燃焼
排ガスの混合割合を制御することにより、常に燃焼が阻
害されることなく燃焼排ガスの送入を行なうことができ
る。したがって、燃焼排ガス循環方式を、何んら支障な
く採用することができる。
In addition, the temperature of the flue gas has dropped to around 230°C, so even if fresh air and flue gas are mixed in both hoppers, harmful components in the flue gas will not condense. and combustion exhaust gas can be mixed in both hoppers and fed into the furnace from below the grate as combustion air. At that time, if combustion exhaust gas is not mixed with fresh air at a certain ratio, combustion will be inhibited. The mixed oxygen concentration is the index value (
By controlling the mixing ratio of combustion exhaust gas to fresh air so as not to exceed 18%), combustion exhaust gas can be constantly fed without inhibiting combustion. Therefore, the combustion exhaust gas circulation system can be adopted without any problems.

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

図面は本発明の一実施例を示し、第1図はフローシート
、第2図は排ガス循環実施前後のNOx濃度を比較した
グラフ図である。
The drawings show one embodiment of the present invention, and FIG. 1 is a flow sheet, and FIG. 2 is a graph comparing the NOx concentration before and after exhaust gas circulation is implemented.

Claims (1)

【特許請求の範囲】[Claims] 1、乾燥、燃焼、後燃焼と燃焼区分があり、燃焼用空気
の予熱器を有するごみ焼却炉において、焼燃排ガスの一
部と燃焼用の新鮮空気とを混合して、燃焼火格子下ホツ
パおよび後燃焼火格子下ホツパに供給し、その際に新鮮
空気に対する燃焼排ガスの混合割合を、新鮮空気中の酸
素濃度と燃焼排ガス中の酸素濃度の混合濃度で判断し制
御することを特徴とするごみ焼却炉の運転方法。
1. In a waste incinerator that has drying, combustion, and after-combustion combustion categories and has a preheater for combustion air, a part of the combustion exhaust gas and fresh air for combustion are mixed and the hopper is placed under the combustion grate. and a hopper under the post-combustion grate, and at that time, the mixing ratio of the combustion exhaust gas to the fresh air is determined and controlled based on the mixed concentration of the oxygen concentration in the fresh air and the oxygen concentration in the combustion exhaust gas. How to operate a garbage incinerator.
JP2218285A 1985-02-06 1985-02-06 Operation of incinerator Pending JPS61180825A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2218285A JPS61180825A (en) 1985-02-06 1985-02-06 Operation of incinerator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2218285A JPS61180825A (en) 1985-02-06 1985-02-06 Operation of incinerator

Publications (1)

Publication Number Publication Date
JPS61180825A true JPS61180825A (en) 1986-08-13

Family

ID=12075649

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2218285A Pending JPS61180825A (en) 1985-02-06 1985-02-06 Operation of incinerator

Country Status (1)

Country Link
JP (1) JPS61180825A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH035613A (en) * 1989-06-02 1991-01-11 Mitsubishi Heavy Ind Ltd Incinerator
CN1312432C (en) * 2001-04-16 2007-04-25 米内吉有限公司 Closed cycle waste combustion
JP2007271226A (en) * 2006-03-31 2007-10-18 Dowa Holdings Co Ltd Combustion control method and combustion device
JP2008249199A (en) * 2007-03-29 2008-10-16 Mitsui Eng & Shipbuild Co Ltd Plastic-containing waste processing device and method
JP2012159264A (en) * 2011-02-02 2012-08-23 Nippon Steel Engineering Co Ltd Method and system for waste melting disposal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5095819A (en) * 1973-12-27 1975-07-30
JPS51119181A (en) * 1975-04-11 1976-10-19 Kawasaki Heavy Ind Ltd Dry treatment apparatus of garbage furnace residue
JPS5546357A (en) * 1978-09-29 1980-04-01 Nippon Kokan Kk <Nkk> Combustion controller for city waste incinerator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5095819A (en) * 1973-12-27 1975-07-30
JPS51119181A (en) * 1975-04-11 1976-10-19 Kawasaki Heavy Ind Ltd Dry treatment apparatus of garbage furnace residue
JPS5546357A (en) * 1978-09-29 1980-04-01 Nippon Kokan Kk <Nkk> Combustion controller for city waste incinerator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH035613A (en) * 1989-06-02 1991-01-11 Mitsubishi Heavy Ind Ltd Incinerator
CN1312432C (en) * 2001-04-16 2007-04-25 米内吉有限公司 Closed cycle waste combustion
JP2007271226A (en) * 2006-03-31 2007-10-18 Dowa Holdings Co Ltd Combustion control method and combustion device
JP2008249199A (en) * 2007-03-29 2008-10-16 Mitsui Eng & Shipbuild Co Ltd Plastic-containing waste processing device and method
JP2012159264A (en) * 2011-02-02 2012-08-23 Nippon Steel Engineering Co Ltd Method and system for waste melting disposal

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