JP2001104746A - Flue gas treatment system - Google Patents
Flue gas treatment systemInfo
- Publication number
- JP2001104746A JP2001104746A JP28222899A JP28222899A JP2001104746A JP 2001104746 A JP2001104746 A JP 2001104746A JP 28222899 A JP28222899 A JP 28222899A JP 28222899 A JP28222899 A JP 28222899A JP 2001104746 A JP2001104746 A JP 2001104746A
- Authority
- JP
- Japan
- Prior art keywords
- ammonia
- concentration
- amount
- exhaust gas
- measuring means
- 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
【０００１】[0001]
【発明の属する技術分野】本発明は排煙処理システムに
係り、特に油炊きボイラから排出される排ガスを電気集
塵器で除塵する排煙処理システムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flue gas treatment system, and more particularly to a flue gas treatment system for removing exhaust gas discharged from an oil-fired boiler by an electric dust collector.
【０００２】[0002]
【従来の技術】油炊きボイラ用の排煙処理システムは、
電気集塵器を備えており、この電気集塵器によって油炊
きボイラから排出された排ガスが除塵されている。以前
の排煙処理システムは、排ガスやダストに含まれる水分
や三酸化イオウ（ＳＯ3 ）のために排ガスの露点が高
く、機器腐食や灰詰まりを起こしたり、酸性の強いスマ
ットを生成するという問題があった。さらに、排ガス中
のダストが非常に細かく、電気固有抵抗率が低いため、
電気集塵器の電極板に捕集したダストが再飛散し易いと
いう問題もあった。2. Description of the Related Art A flue gas treatment system for an oil-fired boiler includes:
An electric dust collector is provided, and the exhaust gas discharged from the oil-fired boiler is removed by the electric dust collector. Previous flue gas treatment systems have the problem of high dew point of exhaust gas due to moisture and sulfur trioxide (SO 3 ) contained in exhaust gas and dust, causing equipment corrosion and ash clogging, and producing strongly acidic smut. was there. Furthermore, the dust in the exhaust gas is very fine and the electrical resistivity is low,
There is also a problem that the dust collected on the electrode plate of the electrostatic precipitator is easily scattered again.
【０００３】そこで、電気集塵器の入口側にアンモニア
ガスを注入してＳＯ3 を中和することによって上記問題
点の解決を図ってきた。前記アンモニアの注入量は、ボ
イラでのＳＯ3 の生成量に応じて行われることが好まし
いが、ＳＯ3 の生成量を求めるのに必要な排ガス中のＳ
Ｏ3 濃度は、連続して測定することができない。そこ
で、ＳＯ3 濃度を仮定し、この仮定ＳＯ3 濃度によりア
ンモニア注入量を燃料消費量に比例注入制御していた。
そして、ＳＯ3 濃度の変化に対しては、比率設定器で、
燃料に含まれるイオウ分の大小によって注入比率を設定
変更することによって対応していた。Therefore, the above problem has been solved by injecting ammonia gas into the inlet side of the electrostatic precipitator to neutralize SO 3 . The injection amount of ammonia is preferably determined according to the amount of SO 3 generated in the boiler. However, the amount of S 3 in the exhaust gas required to determine the amount of SO 3 generated
O 3 concentration cannot be measured continuously. Therefore, the SO 3 concentration is assumed, and the injection amount of ammonia is controlled in proportion to the fuel consumption based on the assumed SO 3 concentration.
Then, for a change in the SO 3 concentration, a ratio setting device
The problem was solved by changing the injection ratio according to the amount of sulfur contained in the fuel.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、最近の
ボイラ設備では、運転コストの低減のために高イオウ油
を燃料として使用することが多く、排ガス中のＳＯ3 濃
度の変化が大きくなってきた。この結果、電気集塵器に
取り込まれる排ガスに従来の制御方法でアンモニアガス
を注入すると、注入量が過不足するという問題が発生す
る。例えば、排ガス中のＳＯ3 濃度が高くなった場合に
は、アンモニアの注入量が不足し、未反応のＳＯ3 によ
って電気集塵器内に酸性硫安が発生する。そして、機器
腐食や灰詰まりが発生し、結果として電気集塵器を停止
せざるを得なくなる。これを防ぐには、アンモニアを予
め過剰に注入すればよいが、何の目安もなくアンモニア
の注入量を増加すれば、アンモニアの注入量が過剰とな
り、経済的に不利益となるだけでなく、電気集塵器から
未反応のアンモニアが多量に排出されて新たな公害原因
となる。However, in recent boiler facilities, high-sulfur oil is often used as fuel in order to reduce operating costs, and the change in SO 3 concentration in exhaust gas has increased. As a result, when ammonia gas is injected into the exhaust gas taken into the electric precipitator by the conventional control method, a problem arises in that the injection amount is excessive or insufficient. For example, when the concentration of SO 3 in the exhaust gas becomes high, the injection amount of ammonia becomes insufficient, and the unreacted SO 3 generates acidic ammonium sulfate in the electrostatic precipitator. Then, equipment corrosion and ash clogging occur, and as a result, the electric precipitator must be stopped. In order to prevent this, it is only necessary to inject ammonia excessively in advance, but if the injection amount of ammonia is increased without any guide, the injection amount of ammonia becomes excessive, not only disadvantageous economically, A large amount of unreacted ammonia is discharged from the electrostatic precipitator, causing new pollution.
【０００５】本発明はこのような事情に鑑みて成された
もので、適切な量のアンモニアを注入することができる
排煙処理システムを提供することを目的とする。The present invention has been made in view of such circumstances, and has as its object to provide a flue gas treatment system that can inject an appropriate amount of ammonia.
【０００６】[0006]
【課題を解決するための手段】本発明は前記目的を達成
するために、ボイラから排出された排ガスにアンモニア
を注入して電気集塵器に供給し、該電気集塵器によって
前記排ガス中のダストを除去する排煙処理システムにお
いて、前記排ガスに注入されたアンモニアが電気集塵器
から排出されるまでの前記排ガスにおけるアンモニア濃
度変化量を測定する濃度変化量測定手段と、前記濃度変
化量測定手段で測定したアンモニア濃度変化量に応じ
て、前記アンモニアの注入量を調整する調整手段と、を
備えたことを特徴とする。According to the present invention, in order to achieve the above-mentioned object, ammonia is injected into exhaust gas discharged from a boiler and supplied to an electric precipitator. In a flue gas treatment system for removing dust, a concentration change amount measuring means for measuring an ammonia concentration change amount in the exhaust gas until the ammonia injected into the exhaust gas is discharged from an electrostatic precipitator, and the concentration change amount measurement. Adjusting means for adjusting the injection amount of ammonia according to the ammonia concentration change amount measured by the means.
【０００７】本発明によれば、濃度変化量測定手段によ
って、アンモニアが注入されてから電気集塵器排出時ま
でのアンモニア濃度変化量を測定することができる。ア
ンモニア濃度変化量は、アンモニアと反応するＳＯ3 の
濃度に依存するので、アンモニア濃度変化量に応じて前
記アンモニアの注入量を調節すれば、ＳＯ3 濃度が変動
した場合であっても、適切な量のアンモニアを注入する
ことができる。According to the present invention, the concentration change amount measuring means can measure the change amount of the ammonia concentration from the injection of ammonia to the discharge of the electrostatic precipitator. Since the amount of change in the ammonia concentration depends on the concentration of SO 3 that reacts with ammonia, if the injection amount of ammonia is adjusted according to the amount of change in the ammonia concentration, even if the SO 3 concentration fluctuates, appropriate An amount of ammonia can be injected.
【０００８】[0008]
【発明の実施の形態】以下添付図面に従って、本発明に
係る排煙処理システムの好ましい実施の形態について説
明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a flue gas treatment system according to the present invention will be described below with reference to the accompanying drawings.
【０００９】図１は、本実施の形態の排煙処理システム
１０の概略構造を示す構成図である。FIG. 1 is a configuration diagram showing a schematic structure of a flue gas treatment system 10 according to the present embodiment.
【００１０】同図に示すように、排煙処理システム１０
は主として、油炊きボイラ１２、空気予熱器１４、電気
集塵器１６、煙突１８から構成され、ボイラ１２から排
出された排ガスが、空気予熱器１４を経た後、電気集塵
器１６で脱塵され、煙突１８から大気に放出されるよう
になっている。[0010] As shown in FIG.
Is mainly composed of an oil-cooked boiler 12, an air preheater 14, an electric precipitator 16, and a chimney 18. The exhaust gas discharged from the boiler 12 passes through the air preheater 14, and is then dedusted by the electric precipitator 16. Then, the air is discharged from the chimney 18 to the atmosphere.
【００１１】ボイラ１２は、該ボイラ１２で消費された
燃料消費量と、ボイラ１２から排出される排ガス量とを
測定できるようになっており、燃料消費量信号３１と排
ガス量信号３２を形成して、後述する制御装置２６に送
信する。The boiler 12 can measure the amount of fuel consumed by the boiler 12 and the amount of exhaust gas discharged from the boiler 12, and forms a fuel consumption signal 31 and an exhaust gas amount signal 32. Then, it is transmitted to the control device 26 described later.
【００１２】電気集塵器１６の入口側には、注入手段２
２が設けられ、この注入手段２２によってアンモニアガ
スが注入される。これにより、排ガスに含まれるＳＯ3
は、アンモニアガスによって中和されて硫酸アンモニウ
ムを生成し、この硫酸アンモニウムが電気集塵器１６に
よって捕集される。At the inlet side of the electrostatic precipitator 16, the injection means 2
2 is provided, and ammonia gas is injected by the injection means 22. As a result, SO 3 contained in exhaust gas
Is neutralized by ammonia gas to produce ammonium sulfate, which is collected by the electrostatic precipitator 16.
【００１３】電気集塵器１６の出口側には、アンモニア
の濃度測定手段２４が設けられ、この濃度測定手段２４
によって電気集塵器１６から排出された未反応のアンモ
ニアの濃度が測定される。濃度測定手段２４で形成され
た未反応アンモニア濃度信号３４は、制御装置２６に送
信される。At the outlet side of the electrostatic precipitator 16, an ammonia concentration measuring means 24 is provided.
Thus, the concentration of unreacted ammonia discharged from the electrostatic precipitator 16 is measured. The unreacted ammonia concentration signal 34 formed by the concentration measuring means 24 is transmitted to the control device 26.
【００１４】図２は、排煙処理システム１０の系統図で
ある。FIG. 2 is a system diagram of the flue gas treatment system 10.
【００１５】同図に示すように、前記注入手段２２は、
ガス遮断手段４２、ガス流量検知手段４４、ガス流量調
節弁４６、逆止弁４８、逆火防止器５０、及び混合器５
２を備えており、気化されたアンモニアガス４０が、ガ
ス遮断手段４２、ガス流量検知手段４４、ガス流量調節
弁４６、逆止弁４８、及び逆火防止器５０を経て混合器
５２に送気されるように、管路が連結されている。混合
器５２に送気されたアンモニアガスは、加熱空気５６と
混合されて約１５〜３０倍に希釈され、注入ノズル（図
示せず）によって図１の電気集塵器１６の入口煙道内に
注入される。As shown in FIG.
Gas shut-off means 42, gas flow detection means 44, gas flow control valve 46, check valve 48, flashback preventer 50, and mixer 5
The vaporized ammonia gas 40 is supplied to the mixer 52 via the gas shut-off means 42, the gas flow detection means 44, the gas flow control valve 46, the check valve 48, and the flashback prevention device 50. Pipes are connected so as to be connected to each other. The ammonia gas sent to the mixer 52 is mixed with the heated air 56 and diluted about 15 to 30 times, and injected into the inlet flue of the electric precipitator 16 of FIG. 1 by an injection nozzle (not shown). Is done.
【００１６】前記ガス流量検知手段４４は、注入される
アンモニアガスの流量を測定する手段であり、アンモニ
ア注入量信号３５を制御装置２６に送信する。また、前
記ガス流量調節弁４６は、注入されるアンモニアガスの
流量を調節する手段であり、信号変換器（ポジショナ）
５４を介して制御装置２６に接続されている。The gas flow rate detecting means 44 is a means for measuring the flow rate of the ammonia gas to be injected, and transmits an ammonia injection amount signal 35 to the control device 26. The gas flow control valve 46 is a means for adjusting the flow rate of the ammonia gas to be injected, and is a signal converter (positioner).
It is connected to the control device 26 via 54.
【００１７】一方、制御装置２６は、前記アンモニア注
入量信号３５の他に、燃料消費量信号３１、排ガス量信
号３２、未反応アンモニア濃度信号３４を取り込んで、
アンモニアの適切な注入量を算出するとともに、アンモ
ニア注入量制御信号３６を形成して、これを注入手段２
２の信号変換器５４に出力する。信号変換器５４に出力
された信号３６は、空気信号に変換され、これによっ
て、ガス流量調節弁４６の開度調整が行われ、注入手段
２２によるアンモニア注入量が調節される。On the other hand, the control device 26 fetches a fuel consumption signal 31, an exhaust gas amount signal 32, and an unreacted ammonia concentration signal 34, in addition to the ammonia injection amount signal 35,
An appropriate injection amount of ammonia is calculated, and an ammonia injection amount control signal 36 is formed.
2 to the second signal converter 54. The signal 36 output to the signal converter 54 is converted into an air signal, whereby the opening of the gas flow control valve 46 is adjusted, and the amount of ammonia injected by the injection means 22 is adjusted.
【００１８】ところで、アンモニアの適切な注入量は、
以下のようにして求められる。Incidentally, an appropriate injection amount of ammonia is as follows.
It is determined as follows.
【００１９】一般にアンモニアの反応は、ＳＯ3 ＋２Ｎ
Ｈ3 ＋Ｈ2 Ｏ→（ＮＨ4 ）2 ＳＯ4で表され、アンモニ
アの適切な注入量は、次式で求められる。Generally, the reaction of ammonia is SO 3 + 2N
H 3 + H 2 O → (NH 4 ) 2 SO 4 , and an appropriate injection amount of ammonia can be obtained by the following equation.
【００２０】[0020]
【数１】アンモニアの注入量(kg/h)＝〔２モル×ＳＯ3
濃度(ppm) ＋必要過剰アンモニア濃度(ppm) 〕×排ガス
量(m3N/h dry) ×アンモニア分子量（＝１７）／１モル
の 標準体積（＝２２．４）×１０-6 …式（１） ここで、前記必要過剰アンモニア濃度は、生成された硫
安を再分解させないために必要であるとともに、排ガス
煙道断面でのＳＯ3 分布のばらつき等に対応するために
必要である。即ち、アンモニア注入量は、ＳＯ3 を中和
するのに最低限必要な基本アンモニア注入量と、中和反
応を安定して行うために必要な必要過剰アンモニア注入
量とを加算することによって求められる。## EQU1 ## Injection amount of ammonia (kg / h) = [2 mol × SO 3
Concentration (ppm) + Necessary excess ammonia concentration (ppm)] × Exhaust gas amount (m 3 N / h dry) × Ammonia molecular weight (= 17) / 1 standard volume of 1 mol (= 22.4) × 10 −6 . 1) Here, the necessary excess ammonia concentration is necessary not to re-decompose the produced ammonium sulfate, and also necessary to cope with variations in the SO 3 distribution in the cross section of the exhaust gas flue. That is, the ammonia injection amount is obtained by adding the minimum basic ammonia injection amount necessary for neutralizing SO 3 and the necessary excess ammonia injection amount necessary for stably performing the neutralization reaction. .
【００２１】基本アンモニア注入量は、ＳＯ3 濃度と排
ガス量を測定することによって求められるが、現状技術
では、ＳＯ3 濃度を連続して測定する測定計が存在しな
い。そこで、制御装置２６は、アンモニアの濃度変化を
測定して、このアンモニア濃度変化をＳＯ3 濃度に換算
し、該換算ＳＯ3 濃度に応じて基本アンモニア注入量を
算出する。即ち、制御装置２６は、注入された際の排ガ
ス中のアンモニア濃度（以下、注入アンモニア濃度と称
す）と、濃度測定手段２４で測定された排ガス中のアン
モニア濃度（以下、未反応アンモニア濃度と称す）を測
定するとともに、以下の式（２）を用いて換算ＳＯ3 濃
度を算出する。The basic ammonia injection amount is obtained by measuring the SO 3 concentration and the amount of exhaust gas. However, in the state of the art, there is no measuring instrument for continuously measuring the SO 3 concentration. Therefore, the controller 26 measures the change in the concentration of ammonia, converts the change in the ammonia concentration into an SO 3 concentration, and calculates the basic ammonia injection amount according to the converted SO 3 concentration. That is, the control device 26 controls the ammonia concentration in the exhaust gas when injected (hereinafter, referred to as the injected ammonia concentration) and the ammonia concentration in the exhaust gas measured by the concentration measuring means 24 (hereinafter, referred to as the unreacted ammonia concentration). ) Is measured, and the converted SO 3 concentration is calculated using the following equation (2).
【００２２】 換算ＳＯ3 濃度＝（注入アンモニア濃度−未反応アンモニア濃度）／２ …式（２） 基本アンモニア注入量は、この式（２）で求めた換算Ｓ
Ｏ3 濃度により、燃料消費量に比例制御される。制御装
置２６は、換算ＳＯ3 濃度を求めると、換算ＳＯ3 濃度
信号３７を濃度指示計３８に出力する。また、制御装置
２６には、図示しない比率設定器を備えており、該比例
設定器によってアンモニアの注入比率を設定変更するこ
とができる。Converted SO 3 concentration = (injected ammonia concentration−unreacted ammonia concentration) / 2 Expression (2) The basic ammonia injection amount is calculated as S converted by this expression (2).
The O 3 concentration is controlled proportionally to the fuel consumption. When obtaining the converted SO 3 concentration, the controller 26 outputs a converted SO 3 concentration signal 37 to the concentration indicator 38. Further, the control device 26 includes a ratio setting device (not shown), and the injection ratio of ammonia can be set and changed by the proportional setting device.
【００２３】次に上記の如く構成された排煙処理システ
ム１０の制御方法について説明する。Next, a control method of the flue gas treatment system 10 configured as described above will be described.
【００２４】まず、制御装置２６は、ボイラ１２から燃
料消費量信号３１を取り込み、この燃料消費量を乗算演
算することによって、基本注入量を算出する。そして、
制御装置２６は、この基本アンモニア注入量に過剰アン
モニア注入量を加算演算し、アンモニア注入量を算出し
た後、制御装置２６の調節器（図示せず）によってＰＩ
制御し、アンモニア注入量制御信号３６を形成する。こ
れにより、アンモニア注入量の制御信号３６が注入手段
２２に出力され、注入手段２２が適量のアンモニアを注
入する。First, the control device 26 fetches the fuel consumption signal 31 from the boiler 12, and calculates the basic injection amount by multiplying and calculating this fuel consumption. And
The control device 26 calculates the ammonia injection amount by adding the excess ammonia injection amount to the basic ammonia injection amount, and then controls the PI by the controller (not shown) of the control device 26.
Control to form an ammonia injection amount control signal 36. Thereby, the control signal 36 for the amount of injected ammonia is output to the injecting means 22, and the injecting means 22 injects an appropriate amount of ammonia.
【００２５】また、制御装置２６は、前記ＰＩ制御信号
に対して、アンモニア注入量信号３５を取り込むことに
よってカスケード制御を行う。The control device 26 performs cascade control by taking in the ammonia injection amount signal 35 with respect to the PI control signal.
【００２６】また、制御装置２６は、アンモニア注入量
信号３５、排ガス量信号３２、未反応アンモニア濃度信
号３４から換算ＳＯ3 濃度を求め、この換算ＳＯ3 濃度
からアンモニアの注入比率を設定変更する。即ち、制御
装置２６は、アンモニア注入量信号３５と排ガス量信号
３２から、注入アンモニア濃度（＝アンモニア注入量／
排ガス流量）を求め、さらに、この注入アンモニア濃度
と未反応アンモニア濃度信号３４から、式（２）より、
換算ＳＯ3 濃度を算出する。そして、算出した換算ＳＯ
3 濃度の信号３７を濃度指示計３８に出力する。これに
より、濃度指示計３８に換算ＳＯ3 濃度が表示されるの
で、作業者が濃度指示計３８を見ながら制御装置２６の
比率設定器を操作してアンモニアの注入比率を設定変更
することによって、適量のアンモニアを注入することが
できる。The control device 26 calculates the converted SO 3 concentration from the ammonia injection amount signal 35, the exhaust gas amount signal 32, and the unreacted ammonia concentration signal 34, and changes the setting of the ammonia injection ratio based on the converted SO 3 concentration. That is, the control device 26 uses the ammonia injection amount signal 35 and the exhaust gas amount signal 32 to determine the injection ammonia concentration (= ammonia injection amount /
Exhaust gas flow rate), and from the injected ammonia concentration and the unreacted ammonia concentration signal 34,
Calculate the converted SO 3 concentration. Then, the calculated converted SO
A signal 37 of three densities is output to a density indicator 38. As a result, the converted SO 3 concentration is displayed on the concentration indicator 38, and the operator operates the ratio setting device of the control device 26 while looking at the concentration indicator 38 to change the setting of the ammonia injection ratio. An appropriate amount of ammonia can be injected.
【００２７】このように本実施の形態の排煙処理システ
ム１０によれば、アンモニアの濃度変化量からＳＯ3 濃
度を換算し、この換算ＳＯ3 濃度に基づいてアンモニア
の注入比率を設定するので、ＳＯ3 濃度が変化した場合
であっても、適量のアンモニアを注入することができ
る。したがって、アンモニアの注入量が不足して電気集
塵器１６で硫安が発生したり、アンモニアの注入量が多
過ぎて、未反応のアンモニアが多量排出されることを防
止することができる。As described above, according to the flue gas treatment system 10 of the present embodiment, the SO 3 concentration is converted from the change in the ammonia concentration, and the injection ratio of ammonia is set based on the converted SO 3 concentration. Even if the SO 3 concentration changes, an appropriate amount of ammonia can be injected. Therefore, it is possible to prevent ammonium sulfate from being generated in the electrostatic precipitator 16 due to insufficient injection amount of ammonia, or to prevent discharge of a large amount of unreacted ammonia due to excessive injection amount of ammonia.
【００２８】また、排煙処理システム１０において、換
算ＳＯ3 濃度を求める式（２）は、アンモニア濃度の減
少分が全てＳＯ3 の中和に用いられたと仮定して、ＳＯ
3 濃度を換算している。したがって、換算ＳＯ3 濃度
は、実測のＳＯ3 濃度よりも若干高く算出される。これ
により、換算ＳＯ3 濃度に応じてアンモニアを注入する
と、アンモニアが若干多めに注入されるので、アンモニ
ア注入不足の発生を確実に防止することができる。In the flue gas treatment system 10, the equation (2) for obtaining the converted SO 3 concentration is based on the assumption that all the decrease in the ammonia concentration has been used for neutralizing SO 3.
3 in terms of the concentration. Therefore, the converted SO 3 concentration is calculated to be slightly higher than the actually measured SO 3 concentration. Thus, when ammonia is injected in accordance with the reduced SO 3 concentration, ammonia is injected slightly more, so that occurrence of insufficient ammonia injection can be reliably prevented.
【００２９】なお、上述した実施の形態では、制御装置
２６に演算機能を有するワンループ形調節器を採用した
が、デジタル制御装置としてもよい。In the above-described embodiment, the control device 26 employs a one-loop controller having an arithmetic function. However, a digital control device may be used.
【００３０】また、上述した実施の形態では、換算ＳＯ
3 濃度を濃度指示計３８に表示することにより、手動で
注入比率を設定変更したが、比率設定器の設定倍率を自
動設定してもよい。これにより、アンモニア注入制御を
全自動化することも可能である。In the above-described embodiment, the conversion SO
Although the setting of the injection ratio is manually changed by displaying the three concentrations on the concentration indicator 38, the set magnification of the ratio setting device may be automatically set. This makes it possible to fully automate the ammonia injection control.
【００３１】[0031]
【発明の効果】以上説明したように、本発明の排煙処理
システムによれば、濃度変化量測定手段でアンモニア濃
度変化量を測定し、該アンモニア濃度変化量に応じて前
記アンモニアの注入量を調節したので、ＳＯ3 濃度が変
動した場合であっても、適切な量のアンモニアを注入す
ることができる。As described above, according to the flue gas treatment system of the present invention, the ammonia concentration change amount is measured by the concentration change amount measuring means, and the ammonia injection amount is adjusted according to the ammonia concentration change amount. Because of the adjustment, an appropriate amount of ammonia can be injected even when the SO 3 concentration fluctuates.
【図１】本発明の実施の形態の排煙処理システムの全体
構成を示す概略構成図FIG. 1 is a schematic configuration diagram showing an entire configuration of a smoke exhaust treatment system according to an embodiment of the present invention.
【図２】図１の排煙処理システムの制御系統を示す系統
図FIG. 2 is a system diagram showing a control system of the flue gas treatment system of FIG.
１０…排煙処理システム、１２…ボイラ、１６…電気集
塵器、２２…注入手段、２４…濃度測定手段、２６…制
御装置、３１…燃料消費量信号、３２…排ガス量信号、
３４…未反応アンモニア濃度信号、３５…アンモニア注
入量信号、３６…アンモニア注入量制御信号、３７…換
算ＳＯ3 濃度信号、３８…濃度指示計DESCRIPTION OF SYMBOLS 10 ... Smoke exhaust system, 12 ... Boiler, 16 ... Electric precipitator, 22 ... Injecting means, 24 ... Concentration measuring means, 26 ... Control device, 31 ... Fuel consumption signal, 32 ... Exhaust gas amount signal,
34: unreacted ammonia concentration signal, 35: ammonia injection amount signal, 36: ammonia injection amount control signal, 37: converted SO 3 concentration signal, 38: concentration indicator
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4D002 AA02 AB01 AC01 BA01 CA01 DA07 EA05 GA04 GB01 GB02 GB06 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D002 AA02 AB01 AC01 BA01 CA01 DA07 EA05 GA04 GB01 GB02 GB06
Claims (3)
を注入して電気集塵器に供給し、該電気集塵器によって
前記排ガス中のダストを除去する排煙処理システムにお
いて、 前記排ガスに注入されたアンモニアが電気集塵器から排
出されるまでの前記排ガスにおけるアンモニア濃度変化
量を測定する濃度変化量測定手段と、 前記濃度変化量測定手段で測定したアンモニア濃度変化
量に応じて、前記アンモニアの注入量を調整する調整手
段と、 を備えたことを特徴とする排煙処理システム。1. A flue gas treatment system for injecting ammonia into exhaust gas discharged from a boiler and supplying it to an electric precipitator, and removing dust in the exhaust gas by the electric precipitator, wherein the exhaust gas is injected into the exhaust gas. Concentration change measuring means for measuring the change in the ammonia concentration in the exhaust gas until the ammonia is discharged from the electrostatic precipitator; and, in accordance with the change in the ammonia concentration measured by the concentration change measuring means, An exhaust gas treatment system comprising: an adjusting unit that adjusts an injection amount.
で測定したアンモニア濃度変化量を、前記排ガス中に存
在した硫黄酸化物の濃度に換算し、該換算値に基づいて
前記アンモニアの注入量を調整することを特徴とする請
求項１記載の排煙処理システム。2. The adjusting means converts the ammonia concentration change amount measured by the concentration change amount measuring means into a concentration of sulfur oxides present in the exhaust gas, and injects the ammonia based on the converted value. 2. The system according to claim 1, wherein the amount is adjusted.
量測定手段と、 前記排ガスに注入されるアンモニア注入量を測定する注
入量測定手段と、 前記電気集塵器から排出された排ガス中のアンモニア濃
度を測定する未反応アンモニア濃度測定手段と、 から成り、前記排ガス量測定手段で測定した排ガス量
と、前記注入量測定手段で測定したアンモニア注入量と
から、アンモニアを注入した際の排ガス中の注入アンモ
ニア濃度を算出するとともに、該注入アンモニア濃度
と、前記未反応濃度測定手段で測定した未反応アンモニ
ア濃度との差から、前記アンモニア濃度変化量を測定す
ることを特徴とする請求項１又は２記載の排煙処置シス
テム。3. An exhaust gas amount measuring means for measuring an amount of exhaust gas supplied to the electrostatic precipitator, and an injection amount measuring means for measuring an ammonia injection amount injected into the exhaust gas. An unreacted ammonia concentration measuring means for measuring the ammonia concentration in the exhaust gas discharged from the electrostatic precipitator, comprising: an exhaust gas amount measured by the exhaust gas amount measuring means, and an ammonia measured by the injection amount measuring means. The amount of injected ammonia in the exhaust gas when injecting ammonia is calculated from the amount of injection, and the ammonia concentration change is calculated from the difference between the injected ammonia concentration and the unreacted ammonia concentration measured by the unreacted concentration measuring means. The system according to claim 1 or 2, wherein the amount is measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28222899A JP3705042B2 (en) | 1999-10-04 | 1999-10-04 | Smoke treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28222899A JP3705042B2 (en) | 1999-10-04 | 1999-10-04 | Smoke treatment system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001104746A true JP2001104746A (en) | 2001-04-17 |
| JP3705042B2 JP3705042B2 (en) | 2005-10-12 |
Family
ID=17649733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28222899A Expired - Fee Related JP3705042B2 (en) | 1999-10-04 | 1999-10-04 | Smoke treatment system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3705042B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614006A (en) * | 2014-12-25 | 2015-05-13 | 吉林省电力科学研究院有限公司 | System and method for measuring carbon dioxide emission factors of power station boiler |
| WO2020094017A1 (en) * | 2018-11-06 | 2020-05-14 | 源柏樑 | Air purification system and internet of things artificial intelligence control apparatus |
| WO2021255329A1 (en) * | 2020-06-16 | 2021-12-23 | Valmet Technologies Oy | System comprising two scrubbers connected to an electrostatic precipitator and a method for purifying exhaust gas using it |
-
1999
- 1999-10-04 JP JP28222899A patent/JP3705042B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614006A (en) * | 2014-12-25 | 2015-05-13 | 吉林省电力科学研究院有限公司 | System and method for measuring carbon dioxide emission factors of power station boiler |
| WO2020094017A1 (en) * | 2018-11-06 | 2020-05-14 | 源柏樑 | Air purification system and internet of things artificial intelligence control apparatus |
| WO2021255329A1 (en) * | 2020-06-16 | 2021-12-23 | Valmet Technologies Oy | System comprising two scrubbers connected to an electrostatic precipitator and a method for purifying exhaust gas using it |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3705042B2 (en) | 2005-10-12 |
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