JPH0416215A - Ammonia injection controlling method for nitrogen oxide removing apparatus - Google Patents
Ammonia injection controlling method for nitrogen oxide removing apparatusInfo
- Publication number
- JPH0416215A JPH0416215A JP2119140A JP11914090A JPH0416215A JP H0416215 A JPH0416215 A JP H0416215A JP 2119140 A JP2119140 A JP 2119140A JP 11914090 A JP11914090 A JP 11914090A JP H0416215 A JPH0416215 A JP H0416215A
- Authority
- JP
- Japan
- Prior art keywords
- concentration
- nox
- ammonia
- nox concentration
- converted
- 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
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000002347 injection Methods 0.000 title claims description 9
- 239000007924 injection Substances 0.000 title claims description 9
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title 3
- 230000003197 catalytic effect Effects 0.000 claims description 2
- 230000004075 alteration Effects 0.000 abstract 2
- 239000002912 waste gas Substances 0.000 abstract 2
- 230000000630 rising effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 14
- 239000000446 fuel Substances 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 231100001143 noxa Toxicity 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002904 solvent Substances 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、アンモニアを使用する触媒方式脱硝装置のア
ンモニア注入制御方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an ammonia injection control method for a catalytic denitrification device using ammonia.
［従来の技術と課８］ 第２図は、従来のアンモニア注入制御方法を示す。[Conventional technology and lesson 8] FIG. 2 shows a conventional ammonia injection control method.
図中の１は燃料流量、２は排ガス中の０２濃度、３は比
例ゲイン、４は乗算器を示す。前記燃料流量１．Ｏ２濃
度２、は比例ゲイン３、乗算器４によって排ガス流量５
が近似され、この排ガス流量５と人口ＮＯｘ濃度６と乗
算器７によってかけあわせることにより排ガス中の総Ｎ
Ｏｘ量８が求められる。In the figure, 1 indicates the fuel flow rate, 2 indicates the 02 concentration in the exhaust gas, 3 indicates the proportional gain, and 4 indicates the multiplier. The fuel flow rate 1. O2 concentration 2, proportional gain 3, multiplier 4, exhaust gas flow rate 5
is approximated, and by multiplying this exhaust gas flow rate 5 and the population NOx concentration 6 by a multiplier 7, the total N in the exhaust gas is calculated.
Ox amount 8 is determined.
一方、燃料流ｊ１９を入力する関数発生器ｌＯによって
アンモニア／ Ｎ Ｏｘモル比設定値１１が作られる。On the other hand, an ammonia/N Ox molar ratio set point 11 is produced by a function generator lO inputting the fuel flow j19.
また、これと総ＮＯｘ量８を乗算器１２によってかけあ
わせ、それを比例ゲイン１３をとすることによってアン
モニア流量設定値１４を得る。Furthermore, by multiplying this by the total NOx amount 8 using a multiplier 12 and setting it as a proportional gain 13, an ammonia flow rate setting value 14 is obtained.
ところで、脱硝装置の最終的な目的は出口ＮＯｘ値を規
定値以下におさえることである。この出口ＮＯｘ規定値
は、排ガス中のＯ２濃度を基準に設定されており、使用
燃料種によってそのＯ２濃度基準も異なっている。Incidentally, the ultimate purpose of the denitrification device is to suppress the outlet NOx value below a specified value. This specified outlet NOx value is set based on the O2 concentration in the exhaust gas, and the O2 concentration standard differs depending on the type of fuel used.
今、基準とすべき０２濃度を６％とすると、α％０２濃
度基準へのＮＯｘ値の換算は次式により求められる。Now, assuming that the 02 concentration that should be the standard is 6%, the NOx value can be converted to the α% 02 concentration standard using the following equation.
）’ −（２１−ａ ） ／ （２１−β）ＸＸ但し、
Ｘ；排ガスＮＯｘ濃度（計測値）ｙ；換算ＮＯｘ濃度（
換算値）
β：排ガス０２濃度（計測値）
α；換算基準０２濃度
上式に示されるように、排ガスＮＯｘが変化しなくても
排ガス０２濃度βか変化すると、換算ＮＯｘ濃度か変化
する。)' −(21-a) / (21-β)XXHowever,
X; Exhaust gas NOx concentration (measured value) y; Converted NOx concentration (
Converted value) β: Exhaust gas 02 concentration (measured value) α: Conversion standard 02 concentration As shown in the above equation, when the exhaust gas 02 concentration β changes even if the exhaust gas NOx does not change, the converted NOx concentration changes.
このように、従来方法によれば、Ｏ２濃度が変わること
により、排ガス流量近似値が変化し、それに伴ってアン
モニア流量設定値が変化するか、その変化量が小さく、
大きな０２濃度変化に対応できないものとなっている。As described above, according to the conventional method, as the O2 concentration changes, the approximate value of the exhaust gas flow rate changes, and the ammonia flow rate set value changes accordingly, or the amount of change is small.
It is not possible to cope with large changes in 02 concentration.
本発明は上記事情に鑑みてなされたもので、Ｏ２濃度が
大きく変動する場合でも、その補正が先行的に処理でき
、もって脱硝器出口Ｎ０ｘＪ度を基準にできるだけ近づ
けことができ、アンモニアの消費量を減少できる脱硝装
置のアンモニア注入制御方法を提供することを目的とす
る。The present invention has been made in view of the above circumstances, and even if the O2 concentration fluctuates greatly, it can be corrected in advance, thereby allowing the denitrifier outlet NO The purpose of the present invention is to provide an ammonia injection control method for a denitrification equipment that can reduce the amount of nitrification.
［課題を解決するための手段］
本発明では、排ガス中の０２ａ度によりアンモニア注入
量を先行的に注入し、Ｏ２濃度変化により換算Ｎ０ｘｉ
１度か規制値を越えるのを防ぐ。[Means for solving the problem] In the present invention, the amount of ammonia is injected in advance according to 02a degrees in the exhaust gas, and the converted NOxi is reduced by changing the O2 concentration.
Prevent the regulation value from being exceeded even once.
Ｏ２濃度変化に伴って注入するアンモニア流量は、以下
の式による。The flow rate of ammonia injected as the O2 concentration changes is determined by the following equation.
０゜濃度がβ−β＋Δβと増加しても、換算ＮＯｘ′ａ
度が変化しないためにはＸ −Ｘ−ΔＸに計測値か変化
しなければならないとすると、この関係から次式が得ら
れる。Even if the 0° concentration increases to β-β+Δβ, the converted NOx'a
Assuming that the measured value must change to X - X - ΔX in order for the degree to remain unchanged, the following equation can be obtained from this relationship.
（２１−α） ／ （２１−β）
−（２１−α） ／ ＋２１− （β＋Δβ））Ｘ（Ｘ
−ΔＸ）
上式を整理することにより、
Δｘｍｘ・Δβ／（２１−β）
となる。(21-α) / (21-β) -(21-α) / +21- (β+Δβ))X(X
-ΔX) By rearranging the above equation, it becomes Δxmx・Δβ/(21−β).
実際、アンモニアを注入すべき場合はΔβ〉Ｏの場合で
あり、通常β−αとなるので、Δｘｍｘ （β−α）
／ （２１−α）（β〉α）Δｘ−０（β≦α）
とする。In fact, the case where ammonia should be injected is when Δβ〉O, and usually β-α, so Δxmx (β-α)
/ (21-α)(β>α)Δx-0(β≦α).
即ち、０２濃度が基準αよりも大きい場合、ΔＸだけＮ
ｏｘｌｉ度を余分に減少させる量のアンモニアを注入す
ることにより、換算ＮＯｘ濃度の増加を押さえることか
できる。That is, if the 02 concentration is greater than the reference α, N by ΔX
By injecting ammonia in an amount that reduces the oxli degree excessively, it is possible to suppress an increase in the equivalent NOx concentration.
［作 用］
本発明において、排ガス中の０２濃度が上昇すると、排
ガス中のＮＯｘ９度（計測値）が上昇しなくても、換算
ＮＯｘ９度が上昇する。この時、ｏ２２度を計測し、０
２濃度上昇とともに、０２濃度上昇に見合ったＮＯｘ濃
度の変分分相当量のアンモニアを注入することにより、
換算ＮＯｘ濃度の上昇を押さえる。[Function] In the present invention, when the 02 concentration in the exhaust gas increases, the converted NOx 9 degrees increases even if the NOx 9 degrees (measured value) in the exhaust gas does not increase. At this time, measure o22 degrees, 0
By injecting ammonia in an amount equivalent to the variation in NOx concentration commensurate with the increase in 02 concentration as the 02 concentration increases,
Prevent the increase in equivalent NOx concentration.
［実施例］
以下、本発明の一実施例について第１図を参照して説明
する。なお、第２図と同部材は同符号を付して説明を省
略する。[Example] Hereinafter, an example of the present invention will be described with reference to FIG. Note that the same members as those in FIG. 2 are given the same reference numerals, and the description thereof will be omitted.
本実施例では、０２濃度２１を入力とする関数発生器２
２を追加し、比例ゲイン２３を通した後、加熱器２４に
より入口ＮＯｘ濃度６に加えることにより、ｏ２！１度
が基準値よりもオーバーしたときにアンモニア設定値を
増加させる。In this embodiment, the function generator 2 receives the 02 density 21 as input.
2 is added to the inlet NOx concentration 6 by the heater 24 after passing through the proportional gain 23, thereby increasing the ammonia set value when o2!1 degree exceeds the reference value.
また、関数発生器２２は、０２濃度βが基準０２濃度α
よりも大きい時、出力を
Ｘ（β−１２） ／ （２１−ａ） ｘ ； ＮＯ
ｘ８度とし、βがαよりも大きい時は出力を０とする。Further, the function generator 22 determines that the 02 concentration β is the reference 02 concentration α
When the output is larger than X(β-12) / (21-a)
x8 degrees, and when β is larger than α, the output is 0.
上記実施例によれば、従来方式に０２濃度２１を入力と
する関数発生器２２を追加し、比例ゲイン２３を通した
後、加熱器２４により人口ＮＯｘ濃度６に加える構成に
することにより、０２濃度か大きく上昇した場合にも、
排ガス中のＮＯｘ濃度（計測値）か上昇しなくても、換
算ＮＯｘ濃度か上昇する。この時、０２濃度を計測し、
０２濃度上昇とともに、０２４度上昇に見合ったＮｏｘ
ｆ１度の変分分相当量のアンモニアを注入することによ
り、換算ＮＯｘ濃度の上昇を押さえることができる。According to the above embodiment, the function generator 22 which inputs the 02 concentration 21 is added to the conventional method, and the 02 concentration 21 is added to the population NOx concentration 6 by the heater 24 after passing through the proportional gain 23. Even if the concentration increases significantly,
Even if the NOx concentration (measured value) in the exhaust gas does not increase, the converted NOx concentration increases. At this time, measure the 02 concentration,
Along with the rise in 02 concentration, Nox commensurate with the rise in 024 degrees.
By injecting ammonia in an amount equivalent to the variation of f1 degrees, it is possible to suppress the increase in the equivalent NOx concentration.
［発明の効果］
以上詳述した如く本発明によれば、０２濃度が大きく変
動する場合でも、その補正か先行的に処理でき、もって
脱硝器出口Ｎ０ｘａ度を基準にできるだけ近づけことが
でき、アンモニアの消費量を減少できる脱硝装置のアン
モニア注入制御方法を提供できる。[Effects of the Invention] As detailed above, according to the present invention, even if the 02 concentration fluctuates greatly, it can be corrected or processed in advance, thereby making it possible to bring the NOxa degree at the outlet of the denitrifier as close as possible to the standard, and reducing the ammonia concentration. It is possible to provide an ammonia injection control method for a denitrification equipment that can reduce consumption of ammonia.
第１図は本発明の一実施例に係る脱硝装置のアンモニア
注入制御方法のシステムを示す説明図、第２図は従来の
脱硝装置のアンモニア注入制御方法のシステムを示す説
明図である。
１・・・燃料濃度、２． ５．２１・・・０２濃度、３
．１３゜２３・・・比例ゲイン、４． ７．１２・・・
乗算器、６・・・入口ＮＯｘ濃度、８・・・総ＮＯｘ量
、９・・・燃料流量、１０・・・関数発生器、１１・・
・モル比設定値、１２・・・酸素極、１４、２２・・・
流量設定器、２４・・・加算器。
溶料流量
Ｃｈａ度FIG. 1 is an explanatory diagram showing a system of an ammonia injection control method for a denitrification apparatus according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a system of a conventional ammonia injection control method for a denitrification apparatus. 1...Fuel concentration, 2. 5.21...02 concentration, 3
．． 13°23...proportional gain, 4. 7.12...
Multiplier, 6... Inlet NOx concentration, 8... Total NOx amount, 9... Fuel flow rate, 10... Function generator, 11...
・Molar ratio setting value, 12... Oxygen electrode, 14, 22...
Flow rate setting device, 24... adder. Solvent flow rate Cha degrees
Claims (1)
硝装置のアンモニア注入制御方法において、排ガス中の
Ｏ＿２濃度を先行信号として用い、Ｏ＿２濃度に対応し
たＮＯ＿ｘ濃度の変分相当量のアンモニアを注入させる
ことを特徴とする脱硝装置のアンモニア注入制御方法。In an ammonia injection control method of a catalytic denitrification device for reducing the NO_x concentration in exhaust gas, the O_2 concentration in the exhaust gas is used as a preceding signal, and ammonia is injected in an amount equivalent to the variation of the NO_x concentration corresponding to the O_2 concentration. A method for controlling ammonia injection in a denitrification equipment, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2119140A JPH0416215A (en) | 1990-05-09 | 1990-05-09 | Ammonia injection controlling method for nitrogen oxide removing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2119140A JPH0416215A (en) | 1990-05-09 | 1990-05-09 | Ammonia injection controlling method for nitrogen oxide removing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0416215A true JPH0416215A (en) | 1992-01-21 |
Family
ID=14753920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2119140A Pending JPH0416215A (en) | 1990-05-09 | 1990-05-09 | Ammonia injection controlling method for nitrogen oxide removing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0416215A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08318132A (en) * | 1995-05-29 | 1996-12-03 | Nisshin Steel Co Ltd | Method for denitrating waste gas and denitrator |
| US6017503A (en) * | 1996-07-25 | 2000-01-25 | Ngk Insulators, Ltd. | Method of removing NOx from exhaust gases |
-
1990
- 1990-05-09 JP JP2119140A patent/JPH0416215A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08318132A (en) * | 1995-05-29 | 1996-12-03 | Nisshin Steel Co Ltd | Method for denitrating waste gas and denitrator |
| US6017503A (en) * | 1996-07-25 | 2000-01-25 | Ngk Insulators, Ltd. | Method of removing NOx from exhaust gases |
| US6455009B1 (en) | 1996-07-25 | 2002-09-24 | Ngk Insulators, Ltd. | System for removing NOx from exhaust gases |
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