JPH1172215A - Controlling method of combustion in incinerator - Google Patents
Controlling method of combustion in incineratorInfo
- Publication number
- JPH1172215A JPH1172215A JP23316597A JP23316597A JPH1172215A JP H1172215 A JPH1172215 A JP H1172215A JP 23316597 A JP23316597 A JP 23316597A JP 23316597 A JP23316597 A JP 23316597A JP H1172215 A JPH1172215 A JP H1172215A
- Authority
- JP
- Japan
- Prior art keywords
- concentration
- nox
- combustion
- range
- incinerator
- 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
Links
Landscapes
- Incineration Of Waste (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、都市ゴミや廃棄物
の焼却処理に用いられる焼却炉の燃焼制御方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion control method for an incinerator used for incineration of municipal waste and waste.
【０００２】[0002]
【従来の技術】この種の焼却炉では、プッシャによって
都市ゴミや廃棄物等の被燃焼物をストーカの燃焼帯上に
送り出し、ストーカの下方から一次空気を供給する状態
において一次燃焼を行なっている。一次燃焼において
は、ＮＯｘの発生を抑制するために、空気が過剰になら
ないようにその量を調節しており、その結果として一次
燃焼において生起するＣＯ等の未燃ガスは、炉内空間の
上部に設定する二次燃焼領域において完全燃焼してい
る。このために、焼却炉の二次燃焼領域には、燃焼帯の
上方から二次空気を供給し、この二次空気によって一次
燃焼の燃焼帯から上昇して来るガスを攪拌し、未燃ガス
を燃焼させている。2. Description of the Related Art In an incinerator of this type, an object to be burned such as municipal waste or waste is sent out onto a combustion zone of a stoker by a pusher, and primary combustion is performed in a state where primary air is supplied from below the stoker. . In the primary combustion, the amount of air is adjusted so as not to become excessive in order to suppress the generation of NOx. As a result, unburned gas such as CO generated in the primary combustion is generated in the upper part of the furnace space. Is completely burned in the secondary combustion region set to. For this purpose, secondary air is supplied to the secondary combustion region of the incinerator from above the combustion zone, and the gas rising from the combustion zone of the primary combustion is agitated by the secondary air to remove unburned gas. Burning.
【０００３】二次空気量は、焼却炉から排出する排ガス
中のＮＯｘ，ＣＯの濃度に影響し、二次燃焼におけるＯ
2濃度が不足すると排ガス中のＣＯの濃度が高まり、Ｏ2
濃度が過剰となると排ガス中のＮＯｘの濃度が高まるこ
とになる。このために、二次空気量を調整することによ
りＮＯｘ，ＣＯ濃度を予め設定する制御範囲内に制御し
ており、ＮＯｘ，ＣＯ，Ｏ2の各濃度の制御範囲内にお
いて各濃度のバランスを取っている。[0003] The amount of secondary air affects the concentration of NOx and CO in exhaust gas discharged from an incinerator.
2 If the concentration is insufficient, the concentration of CO in the exhaust gas increases, and O 2
If the concentration is excessive, the concentration of NOx in the exhaust gas will increase. For this, taking NOx, are controlled within the control range for setting the CO concentration in advance, NOx, CO, the balance of the concentration in the control range of the concentration of O 2 by adjusting the amount of secondary air ing.
【０００４】[0004]
【発明が解決しようとする課題】上記した従来の構成に
おいて、被燃焼物の性状は一定のものではなく、被燃焼
物の性状の変化にともなって燃焼状態も変動し、燃焼状
態の変動は排ガス中のＮＯｘ，ＣＯ濃度に影響を与え
る。このために、ＮＯｘ，ＣＯ，Ｏ2の各濃度の制御範
囲内で各濃度のバランスを取り、制御安定点を見出すた
めには、各濃度の制御範囲を大きく設定することが求め
られる。しかし、制御範囲を大きく設定すると、制御安
定点が必ずしも適正な濃度とはならず、ＮＯｘ，ＣＯ濃
度の規制値が厳しく、その適正範囲が狭い場合には、Ｎ
Ｏｘ，ＣＯ濃度を適正範囲に制御する保証がない。In the above-mentioned conventional construction, the properties of the object to be burned are not constant, and the state of combustion varies with the change in the property of the object to be burned. It affects the concentration of NOx and CO in the inside. For this reason, in order to balance each concentration within the control range of each concentration of NOx, CO, and O 2 and find a control stable point, it is necessary to set the control range of each concentration to be large. However, if the control range is set to be large, the control stable point does not always have an appropriate concentration, and if the regulated values of the NOx and CO concentrations are strict and the appropriate range is narrow, N
There is no assurance that the Ox and CO concentrations will be controlled within the appropriate range.
【０００５】本発明は上記した課題を解決するものであ
り、燃焼状態の大幅な変動に対しても適正範囲内におい
てＮＯｘ，ＣＯ濃度のバランスを取ることができる焼却
炉の燃焼制御方法を提供することを目的とする。The present invention has been made to solve the above-mentioned problem, and provides a combustion control method for an incinerator in which the NOx and CO concentrations can be balanced within an appropriate range even when the combustion state greatly changes. The purpose is to:
【０００６】[0006]
【課題を解決するための手段】上記した課題を解決する
ために、本発明の焼却炉の燃焼制御方法は、空気流量を
操作して排ガス中のＮＯｘ，ＣＯ濃度を制御する焼却炉
において、Ｏ2濃度の制御範囲内において一定の許容変
動幅を持った適正範囲を設定し、適正範囲内にＯ2濃度
を維持するように、Ｏ2濃度を指標として空気流量を制
御し、ＮＯｘ，ＣＯ濃度を指標としてＯ2濃度の適正範
囲をシフトするものである。In order to solve the above-mentioned problems, a combustion control method for an incinerator according to the present invention provides a method for controlling the concentration of NOx and CO in exhaust gas by controlling the air flow rate. within the control range of 2 concentrations set the proper range having a predetermined allowable variation range, so as to maintain the O 2 concentration within the appropriate range, the air flow rate by controlling the O 2 concentration as an indicator, NOx, CO concentration Is used as an index to shift the appropriate range of the O 2 concentration.
【０００７】[0007]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。本実施形態における焼却炉は、プ
ッシャによって都市ゴミや廃棄物等の被燃焼物をストー
カの燃焼帯上に送り出し、ストーカの下方から一次空気
を供給する状態において一次燃焼を行うものであり、一
次燃焼においては、ＮＯｘの発生を抑制するために、空
気が過剰にならないようにその量を調節する。一次燃焼
において生起するＣＯ等の未燃ガスは、炉内空間の上部
に設定する二次燃焼領域において、燃焼帯の上方から二
次空気を供給して燃焼する。Embodiments of the present invention will be described below with reference to the drawings. The incinerator according to the present embodiment is configured to perform primary combustion in a state in which a burner such as municipal garbage or waste is sent out onto a combustion zone of a stoker by a pusher and primary air is supplied from below the stoker. In, in order to suppress the generation of NOx, the amount is adjusted so that the air does not become excessive. Unburned gas such as CO generated in the primary combustion burns by supplying secondary air from above the combustion zone in a secondary combustion region set in the upper part of the furnace space.
【０００８】図１は二次空気流量の制御を行なう回路構
成を示すものである。図１において、Ｏ2濃度制御回路
１は、二次燃焼領域におけるＯ2濃度を指標として二次
空気流量の目標値を算出するものであり、算出した目標
値を二次空気流量の制御手段に指示する。Ｏ2濃度制御
回路１には、一定の変動幅を持った適正範囲を設定して
おり、適正範囲内にＯ2濃度を維持するように二次空気
流量の目標値を算出する。制御範囲設定回路２は、二次
燃焼領域におけるＮＯｘ，ＣＯ濃度を指標としてＯ2濃
度制御回路１にＯ2濃度の適正範囲を指示するものであ
る。FIG. 1 shows a circuit configuration for controlling the secondary air flow rate. In FIG. 1, an O 2 concentration control circuit 1 calculates a target value of the secondary air flow rate using the O 2 concentration in the secondary combustion region as an index, and uses the calculated target value as control means for the secondary air flow rate. To instruct. The O 2 concentration control circuit 1 sets an appropriate range having a certain fluctuation range, and calculates a target value of the secondary air flow rate so as to maintain the O 2 concentration within the appropriate range. The control range setting circuit 2 instructs the O 2 concentration control circuit 1 to set an appropriate range of the O 2 concentration using the NOx and CO concentrations in the secondary combustion region as an index.
【０００９】以下に上記した構成における作用を説明す
る。焼却炉における二次空気量は、焼却炉から排出する
排ガス中のＮＯｘ，ＣＯの濃度に影響する。図２に示す
ように、排ガス中のＣＯの濃度は、Ｏ2濃度の増加に伴
って低下し、Ｏ2濃度の或る値を境として増加に転じ
る。排ガス中のＮＯｘの濃度は、Ｏ2濃度の増加に伴っ
て増加する。The operation of the above configuration will be described below. The amount of secondary air in the incinerator affects the concentration of NOx and CO in the exhaust gas discharged from the incinerator. As shown in FIG. 2, the concentration of CO in the exhaust gas, it decreases with increasing O 2 concentration, changes to increase the boundary certain value of the O 2 concentration. The concentration of NOx in the exhaust gas increases with increasing O 2 concentration.
【００１０】今、Ｏ2濃度制御回路１におけるＯ2濃度の
適正範囲をα１〜β１に設定すると、Ｏ2濃度制御回路
１はＯ2濃度を適正範囲のα１〜β１に維持するように
二次空気流量の目標値を算出する。このとき、ＣＯ濃度
はｃ１〜ｄ１の範囲を適正範囲として変動し、ＮＯｘ濃
度はａ１〜ｂ１の範囲を適正範囲として変動し、各適正
範囲内において各濃度のバランスを取る。[0010] Now, O 2 when the proper range of O 2 concentrations in the density control circuit 1 is set to Arufa1～beta1, two as O 2 concentration controller 1 maintains the O 2 concentration Arufa1～beta1 proper range order Calculate the target value of the air flow rate. At this time, the CO concentration fluctuates with the range of c1 to d1 as an appropriate range, the NOx concentration fluctuates with the range of a1 to b1 as an appropriate range, and balances each concentration within the appropriate range.
【００１１】燃焼状態の変化により、例えばＣＯ濃度が
適正範囲の低位で、ＮＯｘ濃度が適正範囲の高位にある
場合には、ＣＯ濃度にはその制御に余裕があり、ＮＯｘ
濃度はその制御に余裕がないとして、制御範囲設定回路
２はＯ2濃度の適正範囲を低い方へシフトするように、
Ｏ2濃度制御回路１に指示する。結果して、Ｏ2濃度の適
正範囲はα２〜β２にシフトし、ＣＯ濃度の適正範囲は
ｃ２〜ｄ２にシフトし、ＮＯｘ濃度の適正範囲はａ２〜
ｂ２にシフトし、シフトした適正範囲において各濃度が
バランスする。逆に、ＣＯ濃度が適正範囲の高位で、Ｎ
Ｏｘ濃度が適正範囲の低位にある場合には、Ｏ2濃度の
適正範囲が高い方にシフトする。When the CO concentration is low in the appropriate range and the NOx concentration is high in the appropriate range due to a change in the combustion state, for example, the CO concentration has a margin for the control, and the NOx
Assuming that the concentration has no margin for the control, the control range setting circuit 2 shifts the appropriate range of the O 2 concentration to the lower side.
It instructs the O 2 concentration control circuit 1. As a result, the proper range of the O 2 concentration shifts from α2 to β2, the proper range of the CO concentration shifts from c2 to d2, and the proper range of the NOx concentration changes from a2 to
The density shifts to b2, and the respective densities are balanced in the shifted appropriate range. Conversely, if the CO concentration is in the upper
If the Ox concentration is in the lower of the proper range is shifted towards the appropriate range of the O 2 concentration is high.
【００１２】[0012]
【発明の効果】以上述べたように、本発明によれば、Ｏ
2濃度を指標として空気流量を制御し、ＮＯｘ，ＣＯ濃
度を指標としてＯ2濃度の適正範囲をシフトすることに
より、燃焼状態の大幅な変動に対しても適正範囲内にお
いてＮＯｘ，ＣＯ濃度のバランスを取ることができる。As described above, according to the present invention, O
2 By controlling the air flow rate using the concentration as an index and shifting the appropriate range of the O 2 concentration using the NOx and CO concentrations as an index, the balance of the NOx and CO concentrations can be maintained within the appropriate range even for a large fluctuation of the combustion state. Can take.
【図１】本発明の実施形態における制御回路の概念図で
ある。FIG. 1 is a conceptual diagram of a control circuit according to an embodiment of the present invention.
【図２】本発明の実施形態におけるＯ2，ＮＯｘ，ＣＯ
濃度の相関を示すグラフ図である。FIG. 2 shows O 2 , NOx, CO in an embodiment of the present invention.
It is a graph which shows the correlation of density.
１ Ｏ2濃度制御回路 ２ 制御範囲設定回路1 O 2 concentration control circuit 2 Control range setting circuit
Claims (1)
ＣＯ濃度を制御する焼却炉において、Ｏ2濃度の制御範
囲内において一定の許容変動幅を持った適正範囲を設定
し、適正範囲内にＯ2濃度を維持するように、Ｏ2濃度を
指標として空気流量を制御し、ＮＯｘ，ＣＯ濃度を指標
としてＯ2濃度の適正範囲をシフトすることを特徴とす
る焼却炉の燃焼制御方法。1. A method for controlling NOx in exhaust gas by controlling an air flow rate.
In incinerator for controlling the CO concentration, and set the appropriate range with a certain allowable variation range in the control range of the O 2 concentration, so as to maintain the O 2 concentration within the appropriate range, the O 2 concentration as the index and controlling air flow, NOx, combustion control method for incinerator, characterized by shifting the appropriate range of the O 2 concentration and CO concentration as an index.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23316597A JPH1172215A (en) | 1997-08-29 | 1997-08-29 | Controlling method of combustion in incinerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23316597A JPH1172215A (en) | 1997-08-29 | 1997-08-29 | Controlling method of combustion in incinerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1172215A true JPH1172215A (en) | 1999-03-16 |
Family
ID=16950749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23316597A Pending JPH1172215A (en) | 1997-08-29 | 1997-08-29 | Controlling method of combustion in incinerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1172215A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005233501A (en) * | 2004-02-19 | 2005-09-02 | Mitsui Eng & Shipbuild Co Ltd | Combustion control method and waste treatment equipment |
| CN114198759A (en) * | 2021-11-23 | 2022-03-18 | 浦湘生物能源股份有限公司 | Self-adaptive control method and system for oxygen amount of garbage incinerator |
| CN114198759B (en) * | 2021-11-23 | 2024-05-28 | 浦湘生物能源股份有限公司 | Self-adaptive control method and system for oxygen content of garbage incinerator |
-
1997
- 1997-08-29 JP JP23316597A patent/JPH1172215A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005233501A (en) * | 2004-02-19 | 2005-09-02 | Mitsui Eng & Shipbuild Co Ltd | Combustion control method and waste treatment equipment |
| CN114198759A (en) * | 2021-11-23 | 2022-03-18 | 浦湘生物能源股份有限公司 | Self-adaptive control method and system for oxygen amount of garbage incinerator |
| CN114198759B (en) * | 2021-11-23 | 2024-05-28 | 浦湘生物能源股份有限公司 | Self-adaptive control method and system for oxygen content of garbage incinerator |
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|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20040302 |