JPH02101302A - Control method for nox in flue gas - Google Patents
Control method for nox in flue gasInfo
- Publication number
- JPH02101302A JPH02101302A JP63251538A JP25153888A JPH02101302A JP H02101302 A JPH02101302 A JP H02101302A JP 63251538 A JP63251538 A JP 63251538A JP 25153888 A JP25153888 A JP 25153888A JP H02101302 A JPH02101302 A JP H02101302A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- nox
- control
- flame temperature
- signal
- 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
- 238000000034 method Methods 0.000 title claims abstract description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title abstract 3
- 239000003546 flue gas Substances 0.000 title abstract 3
- 238000001514 detection method Methods 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 abstract description 33
- 230000003287 optical effect Effects 0.000 abstract description 8
- 230000001276 controlling effect Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は排ガスのＮＯｘ制御方法、特にボイラ排ガスの
ＮＯｘ制御方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for controlling NOx in exhaust gas, particularly a method for controlling NOx in boiler exhaust gas.
［従来の技術］
従来のボイラ排ガスのＮＯｘ制御方法は、ボイラ煙道出
口のＮＯｘ値を検出し、該検出値が所定範囲内にあるよ
うに、ボイラ負荷に応じてボイラ排ガスの一部をボイラ
燃焼用空気に混入させる空気の量、即ち排ガスミキシン
グ量を調整し、又オーバーエアーポートへの空気流量の
調整も行うようにしている。[Prior Art] A conventional boiler exhaust gas NOx control method detects the NOx value at the boiler flue outlet and directs a portion of the boiler exhaust gas to the boiler according to the boiler load so that the detected value is within a predetermined range. The amount of air mixed into the combustion air, ie, the amount of exhaust gas mixing, is adjusted, and the flow rate of air to the over air port is also adjusted.
［発明が解決しようとする課題］
しかし、上記従来のＮＯｘ制御方法では、主に負荷に応
じて排ガスミキシング量の調整を行うようにしたもので
あるため、例えば燃料の性状変化等によってボイラ火炉
内の火炎温度が変化してＮＯｘの変動が起こったような
場合、そのＮＯｘ値を検出してガスミキシング量を調整
するまでに時間を要するために制御上の時間遅れが生じ
、父上記制御方法ではＮＯｘ値が変動する等の問題を有
していた。[Problems to be Solved by the Invention] However, in the conventional NOx control method described above, the amount of exhaust gas mixing is mainly adjusted depending on the load. When the flame temperature changes and NOx fluctuations occur, it takes time to detect the NOx value and adjust the gas mixing amount, resulting in a time delay in control. There were problems such as fluctuations in NOx values.
本発明は、火炎温度の変化によってＮＯｘ値が変動する
のを防止して制御性の向上を図ることを目的としている
。An object of the present invention is to improve controllability by preventing NOx values from varying due to changes in flame temperature.
［課題を解決するための手段］
排ガスのＮＯｘ値を検出した検出値に基づくＮＯｘ制御
信号により排ガスミキシング量調整ダンパを調整して燃
焼空気への排ガスのミキシング量を調整するようにした
ＮＯｘ制御方法において、バーナ火炎温度を検出し、そ
の火炎温度検出信号を前記制御信号に加味して排ガスミ
キシング量を調整することを特徴とする排ガスのＮＯｘ
制御方法にかかるものである。[Means for solving the problem] A NOx control method that adjusts the mixing amount of exhaust gas into combustion air by adjusting an exhaust gas mixing amount adjustment damper using a NOx control signal based on a detected NOx value of exhaust gas. NOx of exhaust gas, characterized in that the burner flame temperature is detected, and the flame temperature detection signal is added to the control signal to adjust the exhaust gas mixing amount.
It depends on the control method.
［作 用］
火炎温度が変化した場合、火炎温度を検出している光高
温計の火炎温度検出信号が排ガスミキシング量調整ダン
パを制御している制御信号に加味されることにより、火
炎温度が考慮されて排ガスミキシング量が調整される。[Function] When the flame temperature changes, the flame temperature detection signal from the optical pyrometer that detects the flame temperature is added to the control signal that controls the exhaust gas mixing amount adjustment damper, so that the flame temperature is taken into account. and the amount of exhaust gas mixing is adjusted.
［実 施 例］ 以下、本発明の実施例を図面を参照しつつ説明する。[Example] Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明を実施するボイラの一例を示すもので、
ガス燃料、液体燃料等の燃焼を行うボイラ火炉ｌのバー
ナ２部分に、押込通風機３（ＦＤＰ）からの燃焼用空気
か空気ダクト４を介して供給されており、ボイラ火炉１
にて燃焼した後の燃焼後ガスは、後部伝熱部５を介して
下流に導かれるようになっており、更にボイラ煙道出口
（ＥＣＯ６出口）の排ガスの一部が、排ガス混合ファン
７及び排ガスミキシングｆｆｌ調整ダンパ８を介して、
前記空気ダクト４の燃焼用空気に混入されるようにしで
ある。FIG. 1 shows an example of a boiler implementing the present invention.
Combustion air from a forced draft fan 3 (FDP) is supplied via an air duct 4 to the burner 2 portion of the boiler furnace 1, which burns gas fuel, liquid fuel, etc.
The post-combustion gas is guided downstream via the rear heat transfer section 5, and a part of the exhaust gas at the boiler flue outlet (ECO 6 outlet) is further transferred to the exhaust gas mixing fan 7 and Via the exhaust gas mixing ffl adjustment damper 8,
It is intended to be mixed into the combustion air of the air duct 4.
更に、前記押込通風機３の出口には、０ＡＰ（オーバー
エアーボート）配管９が分岐してあり、該ＯＡＰ配管９
はＯＡＰ空気量調整ダンパＩＯを介して前記ボイラ火炉
ｌのバーナ２のに部位置（下流側）に設けたオーバーエ
アーポート１１に連通しである。Further, an OAP (over air boat) pipe 9 is branched at the outlet of the forced draft fan 3.
is connected to an over air port 11 provided at the bottom (downstream side) of the burner 2 of the boiler furnace I via an OAP air amount adjustment damper IO.
前記ボイラ火炉ｌに、バーナ２による火炎の温度を検出
する光高温計１２を設け、該光高温計１２の検出信号１
３を制御装置１４に入力する。The boiler furnace l is provided with an optical pyrometer 12 for detecting the temperature of the flame produced by the burner 2, and the detection signal 1 of the optical pyrometer 12 is
3 is input to the control device 14.
制御装置１４には、ボイラ負荷信号１５、ＮＯｘ制御信
号１６が入力されており、制御装置１４からの制御信号
１７．１８によって前記排ガスミキシングｆｆ１Ｅ整ダ
ンパ８及びＯＡＰ空気量調整ダンパ１０の調整が行われ
るようにしである。A boiler load signal 15 and a NOx control signal 16 are input to the control device 14, and the exhaust gas mixing ff1E regulating damper 8 and the OAP air amount regulating damper 10 are adjusted by control signals 17 and 18 from the control device 14. It's like it's going to happen.
第２図は前記制御装置１４の詳細例を示すもので、前記
ＮＯｘ制御信号１６が別個の関数発生器２３．２４に導
かれて得られた制御信号１７．１８か排ガスミキシング
量調整ダンパ８及びＯＡＰ空気瓜調整ダンパ１０に導か
れて排ガスミキシング量及びＯＡＰ空気量の調整を行う
ようにしである。FIG. 2 shows a detailed example of the control device 14, in which the NOx control signal 16 is guided to separate function generators 23, 24, and the resulting control signals 17, 18 and the exhaust gas mixing amount adjusting damper 8 and The exhaust gas mixing amount and the OAP air amount are adjusted by being led to the OAP air adjustment damper 10.
又、ボイラ負荷信号１５が関数発生器２５を介して関数
変換され、その負荷制御信号２６が掛算器２７を介して
前記排ガスミキシング量の制御信号１７に掛算されるよ
うにしである。Further, the boiler load signal 15 is converted into a function via a function generator 25, and the load control signal 26 is multiplied by the control signal 17 for the exhaust gas mixing amount via a multiplier 27.
更に、前記ボイラ火炉ｌに設けた光高温計１２からの火
炎温度検出信号２８が加減算器２９を介して前記負荷制
御信号２６に加味されるようにしである。Further, a flame temperature detection signal 28 from an optical pyrometer 12 provided in the boiler furnace I is added to the load control signal 26 via an adder/subtractor 29.
」二紀によれば、ＮＯｘ制御信号Ｉ６が、掛算器２７に
よりボイラ負荷信号１５に基づいて調整され、その制御
信号１７によって排ガスミキシングＱ調整ダンパ８か調
整されるが、このとき、光高温計１２によってボイラバ
ーナの火炎温度を検出し、その検出信号２８を加減算器
２９に導いて、その検出信号２８の大きさにより前記負
荷制御信号２６を調整するようにしているので、前記排
ガスミキシング量調整ダンパ８は火炎温度か考慮された
制御信号１７によって調整されることになる。According to Niki, the NOx control signal I6 is adjusted by the multiplier 27 based on the boiler load signal 15, and the exhaust gas mixing Q adjustment damper 8 is adjusted by the control signal 17, but at this time, the optical pyrometer 12 detects the flame temperature of the boiler burner, and the detection signal 28 is guided to an adder/subtractor 29, and the load control signal 26 is adjusted according to the magnitude of the detection signal 28, so that the exhaust gas mixing amount adjustment damper 8 will be regulated by a control signal 17 that takes into account the flame temperature.
従って、同一負荷条件での燃焼状態において、燃料性状
の変化等によって火炎温度か変化することに起因するＮ
Ｏｘ値の変化等を、火炎温度に基づいて先行的に排ガス
ミキシング量を変更することによって調整するようにし
ているので、調整遅れをなくし、且つＮＯｘ値が変動す
るようなことも防止できる。Therefore, in the combustion state under the same load conditions, N due to changes in flame temperature due to changes in fuel properties, etc.
Changes in the Ox value, etc. are adjusted by proactively changing the exhaust gas mixing amount based on the flame temperature, thereby eliminating adjustment delays and preventing fluctuations in the NOx value.
尚、本発明の排ガスのＮＯｘ制御方法は、上述の実施例
にのみ限定されるものではなく、火炎温度検出信号を負
荷制御信号に加味することなく排ガスミキシング量調整
ダンパを制御する制御信号に直接加味するようにしても
良いこと、その他本発明の要旨を逸脱しない範囲内にお
いて種々変更を加え得ることは勿論である。Note that the exhaust gas NOx control method of the present invention is not limited to the above-mentioned embodiments, but can directly add the flame temperature detection signal to the control signal that controls the exhaust gas mixing amount adjustment damper without adding it to the load control signal. It goes without saying that other modifications may be made without departing from the gist of the present invention.
［発明の効果］
以上説明したように、本発明の排ガスのＮＯｘ制御方法
によれば、バーナ火炎温度を検出し、その火炎温度検出
信号を排ガスミキシング量調整ダンパを制御する制御信
号に加味するようにしているので、火炎４１度の変化に
よるＮＯｘ値の変動を未然に防止し、それによりＮＯｘ
値を安定化させて制御性の向」二を図ることができる優
れた効果を奏し得る。[Effects of the Invention] As explained above, according to the exhaust gas NOx control method of the present invention, the burner flame temperature is detected and the flame temperature detection signal is taken into account in the control signal for controlling the exhaust gas mixing amount adjustment damper. This prevents the NOx value from fluctuating due to changes in the flame temperature of 41 degrees, thereby reducing NOx
The excellent effect of stabilizing the value and improving controllability can be achieved.
第１図は本発明の方法を実施する装置の一例を示す正面
図、第２図は第１図の制御装置の一例を示すフローチャ
ートである。
ｌはボイラ火炉、２はバーナ、４は燃焼空気ダクト、７
は排ガス混合ファン、８は排ガスミキシング量調整ダン
パ、１１はオーバーエアーボート、１２は光高温計、１
４は制御装置、１５はボイラ負荷、１７．１８は制御信
号、２３，２４．２５は関数発生器、２７は掛算器、２
８は検出信号、２９は加減算器を示す。
第１FIG. 1 is a front view showing an example of an apparatus for carrying out the method of the present invention, and FIG. 2 is a flowchart showing an example of the control apparatus shown in FIG. l is the boiler furnace, 2 is the burner, 4 is the combustion air duct, 7
is an exhaust gas mixing fan, 8 is an exhaust gas mixing amount adjustment damper, 11 is an over air boat, 12 is an optical pyrometer, 1
4 is a control device, 15 is a boiler load, 17.18 is a control signal, 23, 24.25 is a function generator, 27 is a multiplier, 2
8 indicates a detection signal, and 29 indicates an adder/subtractor. 1st
Claims (1)
＿ｘ制御信号により排ガスミキシング量調整ダンパを調
整して燃焼空気への排ガスのミキシング量を調整するよ
うにしたＮＯ＿ｘ制御方法において、バーナ火炎温度を
検出し、その火炎温度検出信号を前記制御信号に加味し
て排ガスミキシング量を調整することを特徴とする排ガ
スのＮＯ＿ｘ制御方法。1) NO based on the detected value of NO_x value of exhaust gas
In the NO_x control method in which the amount of exhaust gas mixed into the combustion air is adjusted by adjusting the exhaust gas mixing amount adjustment damper using the _x control signal, the burner flame temperature is detected and the flame temperature detection signal is added to the control signal. A method for controlling NO_x of exhaust gas, characterized in that the amount of exhaust gas mixing is adjusted by adjusting the amount of exhaust gas mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63251538A JPH02101302A (en) | 1988-10-05 | 1988-10-05 | Control method for nox in flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63251538A JPH02101302A (en) | 1988-10-05 | 1988-10-05 | Control method for nox in flue gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02101302A true JPH02101302A (en) | 1990-04-13 |
Family
ID=17224307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63251538A Pending JPH02101302A (en) | 1988-10-05 | 1988-10-05 | Control method for nox in flue gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02101302A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7392752B2 (en) | 2002-12-26 | 2008-07-01 | Hitachi, Ltd. | Solid fuel boiler and method of operating combustion apparatus |
| WO2014196848A1 (en) * | 2013-06-06 | 2014-12-11 | Panfil Iurie | Method of operating a boiler unit and the boiler unit |
-
1988
- 1988-10-05 JP JP63251538A patent/JPH02101302A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7392752B2 (en) | 2002-12-26 | 2008-07-01 | Hitachi, Ltd. | Solid fuel boiler and method of operating combustion apparatus |
| WO2014196848A1 (en) * | 2013-06-06 | 2014-12-11 | Panfil Iurie | Method of operating a boiler unit and the boiler unit |
| EA030025B1 (en) * | 2013-06-06 | 2018-06-29 | Юрий Панфил | Method of operating a boiler unit and boiler unit |
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