JP4153658B2 - NOx and NH3 simultaneous analysis apparatus and method - Google Patents

NOx and NH3 simultaneous analysis apparatus and method Download PDF

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Publication number
JP4153658B2
JP4153658B2 JP2000360796A JP2000360796A JP4153658B2 JP 4153658 B2 JP4153658 B2 JP 4153658B2 JP 2000360796 A JP2000360796 A JP 2000360796A JP 2000360796 A JP2000360796 A JP 2000360796A JP 4153658 B2 JP4153658 B2 JP 4153658B2
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concentration
exhaust gas
meter
measurement line
ammonia
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JP2002162393A (en
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稔彦 瀬戸口
昭典 安武
俊雄 小柳
晃弘 山下
敬古 小林
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Mitsubishi Heavy Industries Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、例えば発電設備等の煙道排ガス中のＮＯx 及びＮＨ3 を同時に分析することができる装置に関する。
【０００２】
例えば発電設備等に用いられるボイラ、ガスタービン等の排ガスに含まれる窒素酸化物（ＮＯx ）の計測には、従来より化学発光式の分析計が採用されているが、測定結果がリアルタイムに得られない、測定操作が繁雑であるなどの不具合があり、このような課題を解決できる新しい計測方法が望まれていた。
【０００３】
一方、各種ガス濃度を検出する方法として、例えば、酸素センサや可燃性ガス検知器などの化学センサがある。化学センサは半導体型、起電力型、電気分解型などがあり、検出するガスに応じてセンサ材料が選定されるが、応答速度が早く、使用法も容易である特徴を有する。さらに、化学発光式以外のＮＯ濃度の計測技術として、化学センサ式のＮＯ濃度計があるが、ＮＯ濃度検出用のセンサは、半導体型、起電力型、電流検出型が知られている。いずれも、応答速度が早いことなどの特徴を有することから、測定結果を瞬時にかつ簡易に計測できる利点がある。しかしながら、化学センサは共存ガスによりセンサのＮＯ濃度指示値が影響されることがあるため、化学センサを実機のＮＯ濃度計測に適用するためには、このような共存ガスの影響を回避する必要がある。さらに、このような化学センサはＮＯ濃度を測定すること以外にＮＯ2 やアンモニア濃度（ＮＨ3 ）を計測するために用いることが望まれる。
【０００４】
このため、従来において、図３に示すような排ガス中のＮＯX 分析装置が提案されている。
【０００５】
図３に示すように、ＮＯX 及びＮＨ3 を含む排ガス０１を２系列に分岐し、第１系列０２Ａでアンモニアを酸化させるアンモニア酸化触媒０３と、
該アンモニア酸化触媒０３の下流に配設され、ＮＯX 濃度を測定する第１のＮＯX 計０４Ａと、第２の計測ライン０２Ｂに配設され、ＮＯX を脱硝する第１の脱硝触媒０５と、該脱硝触媒０５の下流に配設され、ＮＯX 濃度を測定する第２のＮＯX 計０４Ｂと、第１のＮＯX 計０４Ａ及び第２のＮＯX 計０４Ｂからのセンサ出力を受けてＮＯｘ濃度及びＮＨ3 濃度を演算計測する演算器０６とを具備するものである。
【０００６】
次に、図３に示す装置を用い、煙道排ガス中のＮＯx を分析する方法を説明する。
図示しない排ガスダクトからサンプリングされた排ガス０１中にＮＯX 分としてＮＯ＋ＮＯ2 がａ（ｐｐｍ）、ＮＨ3 がｂ（ｐｐｍ）が含まれる。このサンプリングガスした排ガス０１を第１の系列０２Ａ及び第２の系列０２Ｂ系列へ分岐する。
第１の系列０２Ａにはアンモニア酸化触媒０３を通過した後に第１のＮＯx 計０４を設置し、ここで、ＮＯX 濃度が測定される。一方、第２の系列０２Ｂ系列では脱硝触媒０５を通過した後に第２のＮＯx 計０４Ｂを設置し、ここで、ＮＯX 濃度が測定される。
【０００７】
ここで、第１系列０２Ａの第１のＮＯX 計０４ＡのＮＯx 測定値はアンモニアがＮＯX に変換した変換量（ｂｐｐｍ）とＮＯX （ａｐｐｍ）との合計量が測定される。一方第２系列０２Ｂの第２のＮＯX 計０４ＢのＮＯx 測定値は、ＮＯX 濃度がアンモニア濃度より高い場合（ａ＞ｂ）には、ＮＯX 計０４Ｂにおいて、ＮＯX 濃度を正常に計測することができる。
【０００８】
【発明が解決しようとする課題】
しかしながら、ＮＯX 濃度がアンモニア濃度より低い場合（ａ＜ｂ）には、ＮＯX 計０４Ｂにおいて、ＮＯX は消費されアンモニアのみが導入されるので、ＮＯX 濃度を計測することができない。
よって、図３に示すような装置では、窒素酸化物（ＮＯX ）濃度が高い場合には、正常に測定できるが、例えばアンモニアによる高深度脱硝を煙道内で行った場合等のように、アンモニアガスが多い場合には、正常に測定することができないという問題がある。
【０００９】
【課題を解決するための手段】
前記課題を解決する本発明の第１の排ガス中のＮＯx 及びＮＨ3 同時分析装置の発明は、排ガス中の窒素酸化物（ＮＯX ）及びアンモニア（ＮＨ3 ）を同時に測定する装置であって、排ガスを二系列に分枝してなる第１の計測ラインと第２の計測ラインと、上記第１の計測ラインに配設され、アンモニアを酸化させるアンモニア酸化触媒と、該アンモニア酸化触媒の下流に配設され、ＮＯX 濃度を測定する第１のＮＯX 計と、第２の計測ラインに配設され、ＮＯX を脱硝する第１の脱硝触媒と、第１の計測ラインと第２の計測ラインの排ガスを合流させた後、合流ガス中のＮＯX を脱硝する第２の脱硝触媒と、第２の脱硝触媒の下流に配設され、ＮＯX 濃度を測定する第２のＮＯX 計と、 第１のＮＯX 計及び第２のＮＯX 計からのセンサ出力を受けてＮＯｘ濃度及びＮＨ3 濃度を演算計測する演算器とを具備することを特徴とする。
【００１０】
第２の発明は、第１の発明において、排ガス中のＮＯ2 濃度を測定するＮＯ2 計を具備してなることを特徴とする。
【００１１】
第３の排ガス中のＮＯx 及びＮＨ3 同時分析方法の発明は、排ガス中の窒素酸化物（ＮＯX ）及びアンモニア（ＮＨ3 ）を同時に測定する方法であって、排ガスを第１の計測ライン第２の計測ラインとの二系列に分枝し、第１の計測ラインにおいてアンモニア酸化触媒によりアンモニアを酸化させ、その後、該アンモニア酸化触媒の下流において、ＮＯX 濃度を測定すると共に、第２の計測ラインにおいて、第１の脱硝触媒によりＮＯX を脱硝させ、その後、第１の計測ラインと第２の計測ラインの排ガスを合流させた後、合流ガス中のＮＯX を第２の脱硝触媒により脱硝させ、第２の脱硝触媒の下流に配設された第２のＮＯX 計でＮＯX 濃度で測定し、且つ第１のＮＯX 計及び第２のＮＯX 計からのセンサ出力を受けてＮＯｘ濃度及びＮＨ3 濃度を演算器により演算計測し、排ガス中のＮＯX 及びＮＨ3 の濃度を測定することを特徴とする。
【００１２】
第４の発明は、第３の発明において、排ガス中のＮＯ2 濃度を測定し、ＮＯX のＮＯ及びＮＯ2 の濃度並びにＮＨ3 濃度を測定することを特徴とする。
【００１３】
【発明の実施の形態】
以下、本発明の実施形態を説明するが、本発明はこれに限定されるものではない。
【００１４】
［第１の実施の形態］
本実施の形態にかかるＮＯx 及びＮＨ3 同時分析装置１０は、図示しない排ガスダクトからサンプリングされた排ガス１１中の窒素酸化物（ＮＯX ）及びアンモニア（ＮＨ3 ）を同時に測定する装置であって、排ガス１１を二系列に分枝して測定する第１の計測ライン１２Ａと第２の計測ライン１２Ｂと、上記第１の計測ライン１２Ａに配設され、アンモニアを酸化させるアンモニア酸化触媒１３と、該アンモニア酸化触媒１３の下流に配設され、ＮＯX 濃度を測定する第１のＮＯX 計１４と、第２の計測ライン１２Ｂに配設され、ＮＯX を脱硝する第１の脱硝触媒１５と、第１の計測ライン１２Ａと第２の計測ライン１２Ｂの排ガスを合流させた後、合流ガス中のＮＯX を脱硝する第２の脱硝触媒１６と、第２の脱硝触媒１６の下流に配設され、ＮＯX 濃度を測定する第２のＮＯX 計１７と、第１のＮＯX 計１４及び第２のＮＯX 計１７からのセンサ出力を受けてＮＯｘ濃度及びＮＨ3 濃度を演算計測する演算器１８とを具備するものである。
【００１５】
ここで、第１の系列１２Ａ系列に配置したアンモニア酸化触媒１３では式（Ｉ）の反応が起こる。
２ＮＨ3 ＋５Ｏ2 ＝２ＮＯ＋３Ｈ2 Ｏ ・・・（Ｉ）
アンモニア酸化触媒１３は、例えばＡｌ2 Ｏ3 を担体としてＰｔを担持させた触媒が適用できる。なお、本発明では、このような触媒に限定されるものではない。
【００１６】
上記アンモニア酸化触媒１３の触媒反応温度は約８００℃であるため、触媒１３を加熱ヒータで反応温度に加熱する。
一方、第２系列１２Ｂ系列に配置した脱硝触媒１５では式（II）の反応が起こる。
４ＮＯ＋４ＮＨ3 ＋Ｏ2 ＝４Ｎ2 ＋６Ｈ2 Ｏ ・・・（II）
ＮＨ3 及びＯ2 は排ガス中に含まれる。
上記脱硝触媒１５は例えば、ＴｉＯ2 を担体としてＶ2 Ｏ5 を担持させた触媒が適用できる。なお、同等の触媒能を持つものであればこれに限定されない。
触媒反応温度は約４００℃であるため、触媒１５を加熱ヒータで反応温度に加熱する。
【００１７】
本発明では、第１の系列１２Ａでは、アンモニア濃度を酸化させてＮＯX とさせたもの（ｂｐｐｍ）とＮＯX （ａｐｐｍ）とを併せた量が第１のＮＯX 計１４で測定され、一方第２の系列１２ＢではＮＯX のＳＣＲ脱硝がなされて、ＮＯX 或いはアンモニアのいずれかが消滅する。その後、第１の系列１２Ａと第２の系列１２Ｂが合わさった場合、第１系列１２ＡのＮＯX 濃度（ａ＋ｂ）が高いので、第２系列１２Ｂのアンモニア濃度が高い場合にでも、ＮＯX 濃度を測定できる。この測定結果をもとに、下記式に当てはめることで、第２のＮＯX 計１７で正確に測定することができる。なお、Ｘは第１の系列１２Ａの流速であり、Ｙは第２の系列１２Ｂの流速である。
【００１８】
［Ｘ（ａ＋ｂ）＋Ｙ（ａ−ｂ）］／Ｘ＋Ｙ＝Ａ …（１）
【００１９】
よって、第１系列０２Ａの第１のＮＯX 計０４ＡのＮＯx 測定値はアンモニア（ｂｐｐｍ）とＮＯX （ａｐｐｍ）との合計量が測定される。一方第２系列０２Ｂの第２のＮＯX 計０４ＢのＮＯx 測定値は、ＮＯX 濃度がアンモニア濃度より高い場合（ａ＞ｂ）及びその逆の場合（ａ＜ｂ）のいずれでもＮＯX とアンモニア濃度とを同時に且つ正常に計測することができる。
【００２０】
［第２の実施の形態］
図２に第２の実施の形態の装置について説明する。
図２に示すように、本実施の形態にかかるＮＯx 及びＮＨ3 同時分析装置１０は、図示しない排ガスダクトからサンプリングされた排ガス１１中の窒素酸化物（ＮＯX ）及びアンモニア（ＮＨ3 ）中のＮＯ2 濃度を測定するＮＯ2 計１９を分枝前に介装してなり、ＮＯ2 濃度を測定しておくものである。
上記ＮＯ2 計は湿式法等のよるＮＯ2 濃度計を用いることができるが、本発明はこれに限定されるものではない。
【００２１】
これにより、上記第１の実施の形態により求めたＮＯX 濃度からＮＯ2 濃度を減ずると、ＮＯ濃度が測定することができる。
【００２２】
この結果、ＮＯX 濃度中のＮＯとＮＯ2 の割合及びアンモニア濃度が同時に計測することができる。
【００２３】
【発明の効果】
以上、説明したように本発明の第１の発明によれば、排ガス中の窒素酸化物（ＮＯX ）及びアンモニア（ＮＨ3 ）を同時に測定する装置であって、排ガスを二系列に分枝してなる第１の計測ラインと第２の計測ラインと、上記第１の計測ラインに配設され、アンモニアを酸化させるアンモニア酸化触媒と、該アンモニア酸化触媒の下流に配設され、ＮＯX 濃度を測定する第１のＮＯX 計と、第２の計測ラインに配設され、ＮＯX を脱硝する第１の脱硝触媒と、第１の計測ラインと第２の計測ラインの排ガスを合流させた後、合流ガス中のＮＯX を脱硝する第２の脱硝触媒と、第２の脱硝触媒の下流に配設され、ＮＯX 濃度を測定する第２のＮＯX 計と、第１のＮＯX 計及び第２のＮＯX 計からのセンサ出力を受けてＮＯｘ濃度及びＮＨ3 濃度を演算計測する演算器とを具備するので、排ガス中のＮＯX 及びＮＨ3 の濃度を測定することができる。特に、排ガス中のアンモニアの量が多い場合においても精度良くＮＯX 濃度の計測が可能となる。
【００２４】
第２の発明は、第１の発明において、排ガス中のＮＯ2 濃度を測定するＮＯ2 計を具備してなるので、ＮＯ及びＮＯ2 の濃度並びにＮＨ3 濃度を測定することができる。
【００２５】
第３の排ガス中のＮＯx 及びＮＨ3 同時分析方法の発明は、排ガス中の窒素酸化物（ＮＯX ）及びアンモニア（ＮＨ3 ）を同時に測定する方法であって、排ガスを第１の計測ライン第２の計測ラインとの二系列に分枝し、第１の計測ラインにおいてアンモニア酸化触媒によりアンモニアを酸化させ、その後、該アンモニア酸化触媒の下流において、ＮＯX 濃度を測定すると共に、第２の計測ラインにおいて、第１の脱硝触媒によりＮＯX を脱硝させ、その後、第１の計測ラインと第２の計測ラインの排ガスを合流させた後、合流ガス中のＮＯX を第２の脱硝触媒により脱硝させ、第２の脱硝触媒の下流に配設された第２のＮＯX 計でＮＯX 濃度で測定し、且つ第１のＮＯX 計及び第２のＮＯX 計からのセンサ出力を受けてＮＯｘ濃度及びＮＨ3 濃度を演算器により演算計測するので、排ガス中のＮＯX 及びＮＨ3 の濃度を測定することができる。
【００２６】
第４の発明は、第３の発明において、排ガス中のＮＯ2 濃度を測定するので、ＮＯX のＮＯ及びＮＯ2 の濃度並びにＮＨ3 濃度を測定することができる。
【図面の簡単な説明】
【図１】第１の本実施の形態にかかるＮＯx 及びＮＨ3 同時分析装置の概略図である。
【図２】第２の実施の形態にかかるＮＯx 及びＮＨ3 同時分析装置の概略図である。
【図３】従来技術にかかるＮＯx 及びＮＨ3 同時分析装置の概略図である。
【符号の説明】
１０ ＮＯx 及びＮＨ3 同時分析装置
１１ 排ガス
１２Ａ 第１の計測ライン
１２Ｂ 第２の計測ライン
１３ アンモニア酸化触媒
１４ 第１のＮＯX 計
１５ 第１の脱硝触媒
１６ 第２の脱硝触媒
１７ 第２のＮＯX 計
１８ 演算器
１９ ＮＯ2 計[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus that can simultaneously analyze NOx and NH 3 in flue gas such as power generation equipment.
[0002]
For example, chemiluminescence analyzers have been used for measuring nitrogen oxides (NOx) contained in exhaust gas from boilers, gas turbines, etc. used in power generation facilities, but the measurement results can be obtained in real time. There is a problem that the measurement operation is complicated, and a new measurement method capable of solving such problems has been desired.
[0003]
On the other hand, as a method for detecting various gas concentrations, for example, there are chemical sensors such as an oxygen sensor and a combustible gas detector. Chemical sensors include a semiconductor type, an electromotive force type, an electrolysis type, and the like, and a sensor material is selected according to a gas to be detected. However, the chemical sensor has a feature that the response speed is fast and the usage is easy. Further, as a NO concentration measurement technique other than the chemiluminescence type, there is a chemical sensor type NO concentration meter. As the sensor for detecting the NO concentration, a semiconductor type, an electromotive force type, and a current detection type are known. Each of them has characteristics such as a high response speed, and therefore has an advantage that the measurement result can be measured instantaneously and easily. However, since the chemical sensor may be affected by the coexisting gas, the sensor NO concentration indication value may be affected. Therefore, in order to apply the chemical sensor to the actual NO concentration measurement, it is necessary to avoid the influence of the coexisting gas. is there. Further, such a chemical sensor is desired to be used for measuring NO 2 and ammonia concentration (NH 3 ) in addition to measuring NO concentration.
[0004]
For this reason, conventionally, an NO x analyzer in exhaust gas as shown in FIG. 3 has been proposed.
[0005]
As shown in FIG. 3, an ammonia oxidation catalyst 03 that branches exhaust gas 01 containing NO x and NH 3 into two series and oxidizes ammonia in the first series 02A;
Is disposed downstream of the ammonia oxidation catalyst 03, a first of the NO X meter 04A for measuring the NO X concentration is disposed in the second measurement line 02B, a first denitration catalyst 05 for denitration of NO X , is disposed downstream of the denitration catalyst 05, NOx receiving a second of the NO X meter 04B for measuring the NO X concentration, the sensor output from the first of the NO X meter 04A and the second of the NO X meter 04B And a calculator 06 for calculating and measuring the concentration and NH 3 concentration.
[0006]
Next, a method for analyzing NOx in flue exhaust gas using the apparatus shown in FIG. 3 will be described.
NO + NO 2 as NO X component in the exhaust gas 01 sampled from a not-shown exhaust gas duct is a (ppm), NH 3 is contained b (ppm) is. The sampled gas exhaust gas 01 is branched into a first series 02A and a second series 02B series.
The first series 02A the first NOx meter 04 placed after having passed through the ammonia oxidation catalyst 03, where, NO X concentrations are measured. On the other hand, in the second series 02B series second NOx meter 04B placed after having passed through the denitration catalyst 05, where, NO X concentrations are measured.
[0007]
Here, the total content of the conversion amount NOx measured value of the first of the NO X meter 04A of the first series 02A is ammonia is converted to NO X (bppm) and NO X (appm) is measured. Meanwhile NOx measured value of the second of the NO X meter 04B of the second series 02B is, NO X concentration in the higher than ammonia concentration (a> b), the NO X meter 04B, measures successfully NO X concentration be able to.
[0008]
[Problems to be solved by the invention]
However, when the NO x concentration is lower than the ammonia concentration (a <b), NO x concentration cannot be measured because NO x is consumed and only ammonia is introduced in the NO x meter 04B.
Therefore, in the apparatus as shown in FIG. 3, when the concentration of nitrogen oxide (NO x ) is high, it can be measured normally. However, for example, when deep denitration with ammonia is performed in a flue, ammonia can be measured. When there is much gas, there exists a problem that it cannot measure normally.
[0009]
[Means for Solving the Problems]
The invention of the simultaneous analysis apparatus for NOx and NH 3 in exhaust gas of the first aspect of the present invention that solves the above-mentioned problems is an apparatus for simultaneously measuring nitrogen oxide (NO x ) and ammonia (NH 3 ) in exhaust gas, A first measurement line and a second measurement line obtained by branching the exhaust gas into two lines, an ammonia oxidation catalyst that is disposed in the first measurement line and oxidizes ammonia, and downstream of the ammonia oxidation catalyst It is disposed, and the first of the NO X meter for measuring the NO X concentration is disposed in the second measurement line, a first denitration catalyst for the denitration of NO X, the first measurement line and the second measurement A second denitration catalyst that denitrates NO x in the merged gas after the exhaust gas in the line is merged, and a second NO x meter that is disposed downstream of the second denitration catalyst and measures the NO x concentration receives the sensor output from the first of the NO X meter and the second of the NO X meter Characterized by comprising a calculator for calculating measuring the NOx concentration and the NH 3 concentration.
[0010]
The second invention is characterized in that, in the first invention, an NO 2 meter for measuring the NO 2 concentration in the exhaust gas is provided.
[0011]
The invention of the method for simultaneous analysis of NOx and NH 3 in the third exhaust gas is a method for simultaneously measuring nitrogen oxides (NO x ) and ammonia (NH 3 ) in the exhaust gas. Branching into two lines with two measurement lines, ammonia is oxidized by the ammonia oxidation catalyst in the first measurement line, and then the NO x concentration is measured downstream of the ammonia oxidation catalyst and the second measurement is performed. In the line, NO x is denitrated by the first denitration catalyst, and then the exhaust gas from the first measurement line and the second measurement line is merged, and then the NO x in the combined gas is denitrated by the second denitration catalyst. It is allowed, in the second of the NO X meter disposed downstream of the second denitration catalyst as measured by NO X concentration, NOx and receives the sensor output from the first of the NO X meter and the second of the NO X meter concentrations and NH 3 concentrations Calculating measured by calculator, and measuring the NO X and the concentration of NH 3 in the exhaust gas.
[0012]
The fourth invention is characterized in that, in the third invention, the NO 2 concentration in the exhaust gas is measured, and the NO and NO 2 concentrations of NO x and the NH 3 concentration are measured.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, although embodiment of this invention is described, this invention is not limited to this.
[0014]
[First Embodiment]
A NOx and NH 3 simultaneous analysis apparatus 10 according to the present embodiment is an apparatus for simultaneously measuring nitrogen oxides (NO x ) and ammonia (NH 3 ) in exhaust gas 11 sampled from an exhaust gas duct (not shown), A first measurement line 12A and a second measurement line 12B for branching and measuring the exhaust gas 11 in two lines; an ammonia oxidation catalyst 13 which is disposed in the first measurement line 12A and oxidizes ammonia; is disposed downstream of the ammonia oxidation catalyst 13, a first of the NO X meter 14 for measuring the NO X concentration is disposed in the second measurement line 12B, and the first denitration catalyst 15 for denitration of NO X, after merging the exhaust gas of the first measurement line 12A and the second measurement line 12B, and the second denitration catalyst 16 for denitration of NO X in the combined gas is disposed downstream of the second denitration catalyst 16 NO X concentration and the second of the NO X meter 17 for measuring a first of the NO X meter 14 and the second of the NO X calculator 18 the NOx concentration and the NH 3 concentration receives the sensor output from the meter 17 calculates measurement It comprises.
[0015]
Here, the reaction of the formula (I) occurs in the ammonia oxidation catalyst 13 arranged in the first series 12A series.
2NH 3 + 5O 2 = 2NO + 3H 2 O (I)
As the ammonia oxidation catalyst 13, for example, a catalyst in which Pt is supported using Al 2 O 3 as a carrier can be applied. Note that the present invention is not limited to such a catalyst.
[0016]
Since the catalyst reaction temperature of the ammonia oxidation catalyst 13 is about 800 ° C., the catalyst 13 is heated to the reaction temperature with a heater.
On the other hand, the reaction of the formula (II) occurs in the denitration catalyst 15 arranged in the second series 12B series.
4NO + 4NH 3 + O 2 = 4N 2 + 6H 2 O (II)
NH 3 and O 2 are contained in the exhaust gas.
As the denitration catalyst 15, for example, a catalyst in which V 2 O 5 is supported using TiO 2 as a carrier can be applied. In addition, if it has an equivalent catalyst ability, it will not be limited to this.
Since the catalyst reaction temperature is about 400 ° C., the catalyst 15 is heated to the reaction temperature with a heater.
[0017]
In the present invention, the first stream 12A, that is the NO X concentration of ammonia was oxidized (BPPM) and NO X (appm) and amount of combined is measured by the first of the NO X meter 14, whereas and SCR denitration of the NO X second series 12B is made, either of the NO X or ammonia disappears. Thereafter, when the first series 12A and the second series 12B are combined, the NO x concentration (a + b) of the first series 12A is high. Therefore, even when the ammonia concentration of the second series 12B is high, the NO x concentration is reduced. It can be measured. Based on this measurement result, it can be accurately measured by the second NO x meter 17 by applying the following equation. X is the flow velocity of the first series 12A, and Y is the flow velocity of the second series 12B.
[0018]
[X (a + b) + Y (ab)] / X + Y = A (1)
[0019]
Therefore, NOx measured value of the first of the NO X meter 04A of the first series 02A is the total amount of ammonia (BPPM) and NO X (appm) is measured. Meanwhile NOx measured value of the second of the NO X meter 04B of the second series 02B, when NO X concentration is higher than the ammonia concentration (a> b) and either NO X and ammonia vice versa (a <b) The concentration can be measured simultaneously and normally.
[0020]
[Second Embodiment]
FIG. 2 illustrates an apparatus according to the second embodiment.
As shown in FIG. 2, the NOx and NH 3 simultaneous analyzer 10 according to the present embodiment includes nitrogen oxide (NO x ) and ammonia (NH 3 ) in exhaust gas 11 sampled from an exhaust gas duct (not shown). A NO 2 meter 19 for measuring the NO 2 concentration is provided before branching to measure the NO 2 concentration.
As the NO 2 meter, a NO 2 concentration meter such as a wet method can be used, but the present invention is not limited to this.
[0021]
Thus, the NO concentration can be measured by subtracting the NO 2 concentration from the NO x concentration obtained by the first embodiment.
[0022]
As a result, the ratio of NO and NO 2 in the NO x concentration and the ammonia concentration can be measured simultaneously.
[0023]
【The invention's effect】
As described above, according to the first invention of the present invention, it is an apparatus for simultaneously measuring nitrogen oxides (NO x ) and ammonia (NH 3 ) in exhaust gas, and the exhaust gas is branched into two series. A first measurement line, a second measurement line, an ammonia oxidation catalyst that oxidizes ammonia, a downstream of the ammonia oxidation catalyst, and a NO x concentration that is disposed in the first measurement line. a first of the NO X meter for measuring is disposed in the second measurement line, a first denitration catalyst for the denitration of NO X, after merging the exhaust gas of the first measurement line and the second measurement line , a second denitration catalyst for the denitration of NO X in the combined gas is disposed downstream of the second denitration catalyst, and a second of the NO X meter for measuring the NO X concentration, first of the NO X meter and calculating the NOx concentration and the NH 3 concentration receives the sensor output from the second of the NO X meter Because and a calculator for measuring, it is possible to measure the NO X and the concentration of NH 3 in the exhaust gas. In particular, even when the amount of ammonia in the exhaust gas is large, the NO x concentration can be accurately measured.
[0024]
Since the second invention comprises the NO 2 meter for measuring the NO 2 concentration in the exhaust gas in the first invention, the concentration of NO and NO 2 and the NH 3 concentration can be measured.
[0025]
The invention of the method for simultaneous analysis of NOx and NH 3 in the third exhaust gas is a method for simultaneously measuring nitrogen oxides (NO x ) and ammonia (NH 3 ) in the exhaust gas. Branching into two lines with two measurement lines, ammonia is oxidized by the ammonia oxidation catalyst in the first measurement line, and then the NO x concentration is measured downstream of the ammonia oxidation catalyst and the second measurement is performed. In the line, NO x is denitrated by the first denitration catalyst, and then the exhaust gas from the first measurement line and the second measurement line is merged, and then the NO x in the combined gas is denitrated by the second denitration catalyst. It is allowed, in the second of the NO X meter disposed downstream of the second denitration catalyst as measured by NO X concentration, NOx and receives the sensor output from the first of the NO X meter and the second of the NO X meter concentrations and NH 3 concentrations Since operation measured by the calculator, it is possible to measure the NO X and the concentration of NH 3 in the exhaust gas.
[0026]
In the fourth invention, since the NO 2 concentration in the exhaust gas is measured in the third invention, the NO and NO 2 concentrations of NO x and the NH 3 concentration can be measured.
[Brief description of the drawings]
FIG. 1 is a schematic view of a simultaneous NOx and NH 3 analyzer according to a first embodiment.
FIG. 2 is a schematic view of a NOx and NH 3 simultaneous analyzer according to a second embodiment.
FIG. 3 is a schematic view of a simultaneous NOx and NH 3 analyzer according to the prior art.
[Explanation of symbols]
10 NOx and NH 3 simultaneous analyzer 11 exhaust gas 12A first measurement line 12B second measurement line 13 ammonia oxidation catalyst 14 first NO x meter 15 first denitration catalyst 16 second denitration catalyst 17 second NO X meter 18 Calculator 19 NO 2 meter

Claims (4)

排ガス中の窒素酸化物（ＮＯX ）及びアンモニア（ＮＨ3 ）を同時に測定する装置であって、
排ガスを二系列に分枝してなる第１の計測ラインと第２の計測ラインと、
上記第１の計測ラインに配設され、アンモニアを酸化させるアンモニア酸化触媒と、
該アンモニア酸化触媒の下流に配設され、ＮＯX 濃度を測定する第１のＮＯX 計と、
第２の計測ラインに配設され、ＮＯX を脱硝する第１の脱硝触媒と、
第１の計測ラインと第２の計測ラインの排ガスを合流させた後、合流ガス中のＮＯX を脱硝する第２の脱硝触媒と、
第２の脱硝触媒の下流に配設され、ＮＯX 濃度を測定する第２のＮＯX 計と、第１のＮＯX 計及び第２のＮＯX 計からのセンサ出力を受けてＮＯｘ濃度及びＮＨ3 濃度を演算計測する演算器とを具備することを特徴とする排ガス中のＮＯx 及びＮＨ3 同時分析装置。An apparatus for simultaneously measuring nitrogen oxides (NO x ) and ammonia (NH 3 ) in exhaust gas,
A first measurement line and a second measurement line obtained by branching exhaust gas into two series;
An ammonia oxidation catalyst disposed in the first measurement line and oxidizing ammonia;
A first NO x meter disposed downstream of the ammonia oxidation catalyst and measuring the NO x concentration;
And disposed in a second measurement line, a first denitration catalyst for the denitration of NO X,
A second denitration catalyst for denitrating NO x in the merged gas after the exhaust gases from the first measurement line and the second measurement line are merged;
A second NO x meter that is disposed downstream of the second denitration catalyst and measures the NO x concentration, receives sensor outputs from the first NO x meter and the second NO x meter, receives the NOx concentration and NH 3. A NOx and NH 3 simultaneous analysis device in exhaust gas, comprising an arithmetic unit for calculating and measuring concentration. 請求項１において、
排ガス中のＮＯ2 濃度を測定するＮＯ2 計を具備してなることを特徴とする排ガス中のＮＯx 及びＮＨ3 同時分析装置。In claim 1,
NOx and NH 3 simultaneous analysis device in the exhaust gas characterized by comprising comprises a NO 2 meter for measuring the NO 2 concentration in the exhaust gas. 排ガス中の窒素酸化物（ＮＯX ）及びアンモニア（ＮＨ3 ）を同時に測定する方法であって、
排ガスを第１の計測ライン第２の計測ラインとの二系列に分枝し、第１の計測ラインにおいてアンモニア酸化触媒によりアンモニアを酸化させ、その後、該アンモニア酸化触媒の下流において、ＮＯX 濃度を測定すると共に、
第２の計測ラインにおいて、第１の脱硝触媒によりＮＯX を脱硝させ、
その後、第１の計測ラインと第２の計測ラインの排ガスを合流させた後、合流ガス中のＮＯX を第２の脱硝触媒により脱硝させ、第２の脱硝触媒の下流に配設された第２のＮＯX 計でＮＯX 濃度で測定し、
且つ第１のＮＯX 計及び第２のＮＯX 計からのセンサ出力を受けてＮＯｘ濃度及びＮＨ3 濃度を演算器により演算計測し、排ガス中のＮＯX 及びＮＨ3 の濃度を測定することを特徴とする排ガス中のＮＯx 及びＮＨ3 同時分析方法。A method for simultaneously measuring nitrogen oxides (NO x ) and ammonia (NH 3 ) in exhaust gas,
The exhaust gas is branched into two lines, the first measurement line and the second measurement line, and ammonia is oxidized by the ammonia oxidation catalyst in the first measurement line, and then the NO x concentration is reduced downstream of the ammonia oxidation catalyst. As well as measuring
In the second measurement line, NO x is denitrated by the first denitration catalyst,
Thereafter, after the exhaust gases of the first measurement line and the second measurement line are merged, the NO x in the merged gas is denitrated by the second denitration catalyst, and the second denitration catalyst disposed downstream of the second denitration catalyst. measured by NO X concentration 2 of the NO X meter,
The NOx concentration and the NH 3 concentration is calculated measured by computing unit and receives the sensor output from the first of the NO X meter and the second of the NO X meter, to measure the NO X and the concentration of NH 3 in the exhaust gas A method for simultaneous analysis of NOx and NH 3 in exhaust gas. 請求項３において、
排ガス中のＮＯ2 濃度を測定し、ＮＯX のＮＯ及びＮＯ2 の濃度並びにＮＨ3 濃度を測定することを特徴とする排ガス中のＮＯx 及びＮＨ3 同時分析方法。In claim 3,
Measuring the NO 2 concentration in the exhaust gas, NOx and NH 3 simultaneous analysis method in the exhaust gas and measuring the concentrations and NH 3 concentrations of NO and NO 2 in the NO X.
JP2000360796A 2000-11-28 2000-11-28 NOx and NH3 simultaneous analysis apparatus and method Expired - Fee Related JP4153658B2 (en)

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US7635593B2 (en) * 2004-05-14 2009-12-22 Fossil Energy Research Corp. (Ferco) In-line localized monitoring of catalyst activity in selective catalytic NOx reduction systems
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US7442555B2 (en) * 2004-12-28 2008-10-28 Nair Balakrishnan G Ammonia gas sensor method and device
US20090065370A1 (en) * 2004-12-28 2009-03-12 Nair Balakrishnan G Ammonia gas sensor method and device
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