JPS6223425A - Apraratus for controlling injection amount of nh3 - Google Patents
Apraratus for controlling injection amount of nh3Info
- Publication number
- JPS6223425A JPS6223425A JP60160499A JP16049985A JPS6223425A JP S6223425 A JPS6223425 A JP S6223425A JP 60160499 A JP60160499 A JP 60160499A JP 16049985 A JP16049985 A JP 16049985A JP S6223425 A JPS6223425 A JP S6223425A
- Authority
- JP
- Japan
- Prior art keywords
- nox
- amount
- fuel flow
- flow rate
- concentration
- 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.)
- Granted
Links
Landscapes
- Treating Waste Gases (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は脱硝装置におけるＮ Ｈｓ （アンモニア）
の注入量の制御に関する。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to the production of NHs (ammonia) in a denitrification equipment.
Regarding the control of the injection amount.
［従来技術］
排ガス中にＮＨ３を注入し接触還元により排ガス中の窒
素酸化物（Ｎ ＯＸ）を無害化する脱硝装置は脱硝装置
の入口および出口にＮＯｘメーターを設置し、脱硝装置
の入口のＮＯｘ 量に対応するＮＨ３１２を求めて、こ
の求めた量のＮＨ３を装置に注入し、装置出口のＮＯｘ
を測定して脱硝状態を監視していた。しかしながらＮＯ
ｘの測定メーターは高価であり、また測定する排ガスが
腐食性の強い排ガスであるため、ＮＯｘメーターの検出
値が変動し、安定性が悪く、少なくとも１日１回は濃度
既知の標準ガスで０点およびスパンの調整が必要であっ
た。[Prior art] A denitrification device that injects NH3 into exhaust gas to render nitrogen oxides (NOX) in the exhaust gas harmless through catalytic reduction has a NOx meter installed at the inlet and outlet of the denitrification device, and NOx at the inlet of the denitrification device is Determine the amount of NH312 corresponding to the amount, inject this determined amount of NH3 into the device, and reduce NOx at the device outlet.
was measured to monitor the denitrification status. However, NO
The NOx measuring meter is expensive, and the exhaust gas it measures is highly corrosive, so the detected value of the NOx meter fluctuates and is unstable, and at least once a day, the NOx meter must be tested to zero with a standard gas of known concentration. Point and span adjustments were required.
［発明の目的］
この発明は脱硝装置の稼動時に、脱硝装置入口のＮ Ｏ
Ｘメーターを不要にして、かつ所要のＮＴＥ３里を演算
できる装置を提供すること、および、設置が義務ずけら
れている脱硝装置出口のＮＯｘメーターを用いて、燃料
ロフトの変更、外気温の変動等、外的要因による算出Ｎ
Ｈ３爪の該差を修正する装置を提供することを目的とす
る。[Object of the Invention] This invention aims to eliminate NO
To provide a device that can calculate the required NTE3 ri without the need for an Calculation N due to external factors such as
It is an object of the present invention to provide a device for correcting this difference in H3 nails.
［発明の構成コ
この発明の制御装置は、燃料流量対ＮＯｘ、ａ度、燃料
流量対Ｏ７濃度をテーブル形状で記憶している記憶手段
と、実際の燃料流量にらとづいて、その燃料流量に対応
するＮ０ｘｆｉを上記記憶手段から読出してＮＯｘ濃度
を演算する演算手段と、前記燃料流量に対応する０、ａ
度を上記記憶手段から続出して乾ガス量を演算する演算
手段と、得られたＮＯｘ濃度と乾ガス量とから所要のＮ
Ｉ−１３供給ｍを演算するＮＨ３供給量演算手段を備
えたことを特徴とするＮ Ｉ（３注大量制御装置である
。[Configuration of the Invention] The control device of the present invention includes a storage means for storing fuel flow rate vs. NOx, a degree, and fuel flow rate vs. O7 concentration in the form of a table, calculation means for calculating the NOx concentration by reading NOxfi corresponding to the above-mentioned storage means; and 0, a corresponding to the fuel flow rate;
calculation means for calculating the amount of dry gas by continuously reading out the NOx concentration from the storage means;
This is an NI (3-injection mass control device) characterized by being equipped with NH3 supply amount calculation means for calculating I-13 supply m.
上記の構成によりＮＯｘ量はＮ Ｏｘａａ度算手段より
得られるので脱硝装置の高価なＮＯｘメーターを不要と
することができる。With the above configuration, the amount of NOx can be obtained from the NOxaa calculation means, making it possible to eliminate the need for an expensive NOx meter in the denitrification device.
更に、脱硝装置出口にＮＯｘメーター１６を設置し、制
御部６内に異常監視部を設は脱硝装置出口のＮＯｘ濃度
を監視し、設定ＮＯｘ濃度上限または下限をはずれた場
合、警報を発し、ＮＯｘメーターの検定を行うことを特
徴とする。Furthermore, a NOx meter 16 is installed at the outlet of the denitrification equipment, and an abnormality monitoring unit is installed in the control unit 6 to monitor the NOx concentration at the exit of the denitrification equipment, and if the NOx concentration exceeds the set upper or lower limit, an alarm is issued and the NOx It is characterized by performing meter verification.
［実施例］
第１図において、燃料は燃料流量計１を通って燃料装置
２に供給される。燃料装置２で生じた排ガスは脱硝３で
脱硝され、清浄化された空気は煙突から排出される。[Example] In FIG. 1, fuel is supplied to a fuel system 2 through a fuel flow meter 1. In FIG. Exhaust gas generated by the fuel device 2 is denitrified by a denitrifier 3, and the purified air is discharged from the chimney.
一方、Ｎ ＨｓはＮＨ３流量計４を通り、ＮＨ３調節弁
５で流量制御されて、脱硝装置３に供給される。On the other hand, NHs passes through an NH3 flow meter 4, its flow rate is controlled by an NH3 control valve 5, and then supplied to the denitrification device 3.
ＮＨ３調節弁５の開度は制御部６の出力信号により制御
される。The opening degree of the NH3 control valve 5 is controlled by an output signal from the control section 6.
制御部６には燃料流量対ＮＯｘ濃度をテーブルどして記
憶している第１メモリ７、燃料流１対Ｏ７濃度をテーブ
ルとして記憶しているメモリ８とを有する。各メモリ７
．８のテーブルは、あらかじめ、燃料流量を数点（例え
ば４〜５点）変更して、燃焼させ齢硝装置の人口の排ガ
スをＮＯｘメーターで、脱硝装置入口のＯ７ａ度をＯ，
メーターで、測定し、当該燃焼装置における燃料流量に
対するＮｏｘｉａ度およびＯ２濃度を求め、キー人力装
置１０から入力され、作成される。The control unit 6 has a first memory 7 that stores fuel flow rate versus NOx concentration as a table, and a memory 8 that stores fuel flow 1 vs. O7 concentration as a table. Each memory 7
．． In Table 8, the fuel flow rate is changed several points (for example, 4 to 5 points) in advance, and the exhaust gas of the combustion and aging equipment is measured with a NOx meter, and the O7a degree at the denitrification equipment inlet is set to O,
The meter measures the Noxia degree and O2 concentration for the fuel flow rate in the combustion device, and inputs and creates from the key human power device 10.
なお、０．メーターは当該脱硝装置の設置時のみ必要で
あり、以後年１回程度メンテナンス時に確認の為に用い
ればよいので、特に本装置の７）に常備している必要は
ない。In addition, 0. The meter is only needed when installing the denitrification equipment, and can be used for confirmation once a year or so during maintenance, so it is not necessary to have it on hand at all times, especially in step 7) of this equipment.
乾ガス量演算およびＮＨ３供給量演算に必要な定数もそ
れぞれキー人力装置１０から入力され、演算定数部１５
で記憶される。The constants necessary for dry gas amount calculation and NH3 supply amount calculation are also input from the key human power device 10, and the calculation constant part 15
is memorized.
このような準備が終了した後、この制御装置は脱硝装置
に注入するＮ Ｈ３注入量制御に用いられる。After such preparation is completed, this control device is used to control the amount of NH3 injected into the denitrification device.
撚ｕ−ＩＩｆｍ ｔ） Ｉ ”’ｉ’ ！、＋ ｉ［ｌ
ｌ Ａれたｅｌｌ流ｆｆ１Ｇ、１ｆＮＯｙ濃度演算部２
．０１濃度演算部１２に印加され、ここで、実際の燃料
流量Ｇ、に対するＮＯｘと０２濃度とをメモリ７．８か
ら続出し適宜補間法を用いて算出し、ＮＯｘ濃度、０．
ａ度をそれぞれＮＨ３供給量演算１３、乾ガス量演算１
４に送る。Twist u-IIfm t) I ”'i' !, + i[l
l Aell flow ff1G, 1fNOy concentration calculation unit 2
．． The NOx and 02 concentrations for the actual fuel flow rate G are read out from the memory 7.8 and calculated using an appropriate interpolation method, and the NOx concentration, 0.
NH3 supply amount calculation 13 and dry gas amount calculation 1 for each a degree
Send to 4.
乾ガス量演算１４は上記燃料流ｍＧ、と上記０２濃度と
演算定数部に記憶されている理論燃焼排ガス全Ｇ。、理
論空気Ａ。、水分率ρを用いて乾ガスｍＧｄを次式によ
り演算し、Ｎ■■３供給量演算部１３に送る。The dry gas amount calculation 14 is the fuel flow mG, the concentration 02, and the theoretical combustion exhaust gas total G stored in the calculation constant section. , theoretical air A. , the dry gas mGd is calculated using the following equation using the moisture content ρ, and is sent to the N■■3 supply amount calculation section 13.
Ｍ＝２１÷（２＋−０，）
Ｇｄ−（ＧＯ＋（Ｍ−１）ＸＡＯ）ｘｃ、ｘ（１−／１
））ＮＨ３供給量演算部１３は」二記乾ガスｉＧｄおよ
び演算定数部に記憶されているＮ Ｉ−Ｉ 、供給モル
比Ｋ。M=21÷(2+-0,) Gd-(GO+(M-1)XAO)xc, x(1-/1
)) The NH3 supply amount calculation section 13 calculates the dry gas iGd, N I-I, and supply molar ratio K stored in the calculation constant section.
定数αβに基づいて、いま流れている燃料流ｆｆ１Ｇ。Based on the constant αβ, the currently flowing fuel flow ff1G.
に対する排ガスの清浄化に必要なＮ Ｈ，の量を次式に
より算出する。The amount of NH required to purify the exhaust gas is calculated using the following formula.
Ｎ１−ｌ３＝ＫＸ［ＮＯｘ］Ｘ［Ｇｄ］Ｘ［αコ＋β・
・（１）こ＼に、通常にの値は０．８前後２は０が使用
される。た＼燃焼装置や脱硝装置、燃料の種類等により
適宜数値を変更して用いることかできる。N1-l3=KX[NOx]X[Gd]X[α+β・
・(1) In this case, normally the value is around 0.8 and 0 is used for 2. The values can be changed as appropriate depending on the combustion equipment, denitrification equipment, type of fuel, etc.
各演算に用いられる定数に、α、β、ρ、 Ａ ｏ 、
Ｇ ｏはキー人力された値であり演算定数部１５から
供給されている。なお上記の緒定数の一例を表Ｉに示す
。The constants used in each operation include α, β, ρ, A o ,
G o is a value entered manually and is supplied from the arithmetic constant section 15 . An example of the above constants is shown in Table I.
上記のようにして演算されたＮ Ｈ３ｆｆｉはＰＩＤ演
算部１６に供給され、Ｎ ｌ−１３流量計４から印加さ
れるＮ Ｉ−Ｉ 、の実際の１Ａｆｉ！データーとキー
人力され、ＰＩＤ定数部に記憶されているＰＩＤ定数と
によりＰＩＤＩＤ制御量算される。ＰＩＤ制御量が演算
され、Ｎ■−＋３ｉ節弁開度演算部１７で弁開度が演算
され、ＮＨ３調節弁５の開度が制御される。そしてＮＨ
３供給里演算部１３で演算された量のＮ Ｈ３か脱硝装
置３に供給され排ガスの浄化が行なわれる。The N H3ffi calculated as described above is supplied to the PID calculation unit 16, and the actual 1Afi of N I-I applied from the N l-13 flowmeter 4! The PIDID control amount is calculated using the data and the PID constant input manually and stored in the PID constant section. The PID control amount is calculated, the valve opening is calculated in the N■-+3i mode valve opening calculating section 17, and the opening of the NH3 control valve 5 is controlled. And N.H.
The amount of NH3 calculated by the 3-supply calculation section 13 is supplied to the denitrification device 3 to purify the exhaust gas.
以上のようにして脱硝装置入口にＮＯｘメーターを設置
せずに適量のＮ Ｈ，を供給して浄化ができる。As described above, purification can be performed by supplying an appropriate amount of NH without installing a NOx meter at the inlet of the denitrification equipment.
さらにＮｏｘＱ度監視の為に設置が義務づけられている
脱硝装置出口のＮＯｘメーター１８より異常監視部Ｉ９
に出口Ｎ０ｘａ度信号を送り異常監視部Ｉっで次の検定
を行う。あらかじめ設定値部２０には入力端末２０より
設置排出Ｎ０ｘａ度（ＳＰ）、積算時間（Ｔ、）と許容
誤差（ＳＥＲ）とが目標脱硝率としては０．９程度、積
算時間は、１〜３０分通常２０〜３０分、許容誤差は０
．１程度が入力される。Furthermore, an abnormality monitoring section I9 is detected from the NOx meter 18 at the outlet of the denitrification equipment, which is required to be installed to monitor the NoxQ level.
Send the exit NOxa degree signal to the abnormality monitoring section I and perform the next verification. In advance, the setting value unit 20 is input from the input terminal 20 with the installed discharge NOxa degrees (SP), cumulative time (T, ), and allowable error (SER).The target denitrification rate is approximately 0.9, and the cumulative time is 1 to 30. minutes usually 20-30 minutes, tolerance is 0
．． About 1 is input.
まず、出口ＮＯｘメーターのＮＯｘ濃度の値とＮＯｘ濃
度演算部１１の入口Ｎ０ｘａ度の値とから脱硝率（Ｎ）
を演算し、目標脱硝率（ＳＰ）との差を求める。これを
ザンブリング時間毎に行い、積算時間（Ｔ、）の間、積
算しサンプリング回数で除し誤差平均値を得る。First, the denitrification rate (N) is determined from the NOx concentration value of the outlet NOx meter and the inlet NOxa degree value of the NOx concentration calculation unit 11.
is calculated, and the difference from the target denitrification rate (SP) is determined. This is performed for each zumbling time, and is integrated during the integration time (T,) and divided by the number of samplings to obtain the average error value.
誤差平均値ＥＲの絶対値が許容誤差の範囲外となれば出
口ＮＯｘメーターの検定を指示する。ＮＯｘメーターの
検定は自体公知の方法で標学ガスを用いて自動的に検定
される。ＮＯｘ、メーターが異常であれば警報を発しＮ
Ｏｘメーターの交換等正常化対策が行なイつれる。If the absolute value of the average error value ER falls outside the allowable error range, an instruction is given to verify the outlet NOx meter. The NOx meter is automatically calibrated using a standard gas in a manner known per se. NOx, if the meter is abnormal, an alarm will be issued.
Measures to restore normalcy, such as replacing oxygen meters, will be carried out.
ＮＯｘメーターが正常化な場合は、異常監視部ｌ５の■
（の値を修正する。If the NOx meter is normal, check the abnormality monitoring section 15.
(Modify the value of
正（＝ＫＸＣ（１−ＥＲ） ・・
・・（３）こ＼にＣは０〜ｌＯの間の適当な値を用いろ
が０５程度か適当である。Positive (=KXC(1-ER)...
(3) Here, C should be an appropriate value between 0 and 1O, but approximately 05 is appropriate.
このように定数Ｋを修正子ることによりＮ Ｉ−＋ ３
供給量演算部１３における式（１）の演算結果を適正化
する。By modifying the constant K in this way, N I-+ 3
The calculation result of equation (1) in the supply amount calculation unit 13 is optimized.
以上のように、本装置を用いることにより人ロＮＯｘメ
ーター不用とし、かつ長期にわたって脱硝装置のＮ ｌ
−１３供給量を制御することができる。As described above, by using this device, the need for a human NOx meter is eliminated, and the denitrification equipment's Nl
-13 Supply amount can be controlled.
１１図は、この発明の一実施例を示すブロック図である
。
Ｉ ・燃料流量計、 ２・・・燃焼装置、３・・
脱硝装置、 ５・Ｎ Ｈ３凋節弁、６・・・制
御部、 １１・・Ｎ０ｘＫ４度演算部、１３
・・Ｎ Ｈ３供給量演算部、１８・・・ＮＯｘメーター
１９・・・異常監視部。FIG. 11 is a block diagram showing an embodiment of the present invention. I ・Fuel flow meter, 2... Combustion device, 3...
Denitrification device, 5.N H3 reduction valve, 6...control unit, 11...N0xK4 degree calculation unit, 13
...NH3 supply amount calculation section, 18...NOx meter 19...abnormality monitoring section.
Claims (2)
テーブル形状で記憶している記憶手段と、実際の燃料流
量にもとづいてその燃料流量に対するＮＯｘ量を上記記
憶手段から読み出してＮＯｘ濃度を演算するＮＯｘ濃度
演算手段と、前記燃料流量に対するＯ＿２濃度を上記記
憶手段から読み出して乾ガス量と演算する乾ガス量演算
手段と上記ＮＯｘ濃度と上記乾ガス量とからＮＨ＿３供
給量を演算するＮＨ＿３供給量演算手段を備えたことを
特徴とするＮＨ＿３注入量制御装置。(1) Storage means that stores fuel flow rate vs. NOx concentration and fuel flow rate vs. O_2 concentration in the form of a table, and based on the actual fuel flow rate, reads out the NOx amount for that fuel flow rate from the storage means and calculates the NOx concentration. NOx concentration calculation means for calculating the dry gas amount by reading out the O_2 concentration for the fuel flow rate from the storage means, and NH_3 supply for calculating the NH_3 supply amount from the NOx concentration and the dry gas amount. An NH_3 injection amount control device comprising an amount calculation means.
テーブル形状で記憶している記憶手段と、実際の燃料流
量にもとづいて、その燃料に対応するＮＯｘ量を上記記
憶手段から読み出してＮＯｘ濃度を演算するＮＯｘ濃度
演算手段と、前記燃料流量に対応するＯ＿２濃度を、上
記記憶手段から読み出して乾ガス量を演算する乾ガス量
演算手段と、上記ＮＯｘ濃度と上記乾ガス量とからＮＨ
＿３供給量を演算するＮＨ＿３供給演算手段と、脱硝装
置出口ＮＯｘ濃度検出ＮＯｘメーターと、異常監視部と
を備えたことを特徴とするＮＨ＿３供給制御装置。(2) Storage means that stores fuel flow rate vs. NOx concentration and fuel flow rate vs. O_2 concentration in the form of a table, and based on the actual fuel flow rate, the NOx amount corresponding to the fuel is read out from the storage means and NOx concentration is stored. NOx concentration calculation means for calculating the O_2 concentration corresponding to the fuel flow rate from the storage means and dry gas amount calculation means for calculating the dry gas amount;
An NH_3 supply control device comprising: NH_3 supply calculation means for calculating a supply amount; a NOx meter for detecting NOx concentration at the outlet of a denitrification device; and an abnormality monitoring unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60160499A JPS6223425A (en) | 1985-07-20 | 1985-07-20 | Apraratus for controlling injection amount of nh3 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60160499A JPS6223425A (en) | 1985-07-20 | 1985-07-20 | Apraratus for controlling injection amount of nh3 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6223425A true JPS6223425A (en) | 1987-01-31 |
| JPH0155890B2 JPH0155890B2 (en) | 1989-11-28 |
Family
ID=15716256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60160499A Granted JPS6223425A (en) | 1985-07-20 | 1985-07-20 | Apraratus for controlling injection amount of nh3 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6223425A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52153869A (en) * | 1976-06-17 | 1977-12-21 | Kurabo Ind Ltd | Method and device for controlling equipment for removal of nitrogen oxides |
| JPS5650610A (en) * | 1979-09-29 | 1981-05-07 | Nec Corp | Balanced variable equalizing circuit |
-
1985
- 1985-07-20 JP JP60160499A patent/JPS6223425A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52153869A (en) * | 1976-06-17 | 1977-12-21 | Kurabo Ind Ltd | Method and device for controlling equipment for removal of nitrogen oxides |
| JPS5650610A (en) * | 1979-09-29 | 1981-05-07 | Nec Corp | Balanced variable equalizing circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0155890B2 (en) | 1989-11-28 |
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