JPH07110323A - Ammonia concentration measuring method - Google Patents
Ammonia concentration measuring methodInfo
- Publication number
- JPH07110323A JPH07110323A JP5255509A JP25550993A JPH07110323A JP H07110323 A JPH07110323 A JP H07110323A JP 5255509 A JP5255509 A JP 5255509A JP 25550993 A JP25550993 A JP 25550993A JP H07110323 A JPH07110323 A JP H07110323A
- Authority
- JP
- Japan
- Prior art keywords
- nox
- concentration
- exhaust gas
- line
- gas
- 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.)
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- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Sampling And Sample Adjustment (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は有触媒脱硝法又は無触媒
脱硝法における窒素酸化物（ＮＯｘ）とアンモニア（Ｎ
Ｈ3 ）が共存する排ガス中のアンモニアを計測する方法
に関する。The present invention relates to nitrogen oxide (NOx) and ammonia (Nx) in a catalytic denitration method or a non-catalytic denitration method.
The present invention relates to a method for measuring ammonia in exhaust gas in which H 3 ) coexists.
【０００２】[0002]
【従来の技術】窒素酸化物を除去する方法としてＮＨ3
を還元剤として利用する方法がある。ボイラ、ガスター
ビン、リファイナリー加熱炉等、化石燃料を使用した燃
焼ガス中のＮＯｘはＮＯ及びＮＯ2 が主体であり、その
うちでも５０％以上（通常は９０％以上）はＮＯの状態
である。これらＮＯｘは触媒を介してＮＨ3 と容易かつ
高効率で反応するため（いわゆる有触媒脱硝法）、この
方法を利用してＮＨ3 濃度を計測する方法がある。2. Description of the Related Art NH 3 is used as a method for removing nitrogen oxides.
Is available as a reducing agent. NOx in combustion gas using fossil fuels such as boilers, gas turbines, refinery heating furnaces is mainly NO and NO 2 , and 50% or more (normally 90% or more) of them is in the NO state. Since NOx easily reacts with NH 3 through a catalyst with high efficiency (so-called catalytic denitration method), there is a method of measuring the NH 3 concentration using this method.
【０００３】この従来のＮＨ3 濃度計測法の一態様を図
３によって説明する。図３において、１はガス中のＮＯ
ｘ計測用サンプルプローブ、２はサンプリングライン、
３は触媒設置サンプルプローブ、４はサンプリングライ
ン、５はライン切換弁、６は触媒、７はＮＯｘ計を示
す。図３に示すように、ガスダクト中のガスのＮＯｘ濃
度を計測するＮＯｘ計測用サンプルプローブ１を設け、
該プローブ１で採取されたガスをサンプリングライン
２、切換弁５を介してＮＯｘ計７でガスダクト内のガス
のＮＯｘ濃度を計測すると共に、もう一つの触媒６を設
置した触媒設置サンプルプローブ３を設け、該プローブ
３で採取したガスを触媒６によってガス中のＮＯｘとＮ
Ｈ3 とを反応させた後、サンプリングライン４、切換弁
５を介してＮＯｘ計７で反応後のガス中のＮＯｘ濃度を
計測し、前者のＮＯｘ濃度と後者のＮＯｘ濃度の差から
ガス中のＮＨ3 濃度を算出する方法である。One aspect of this conventional NH 3 concentration measuring method will be described with reference to FIG. In FIG. 3, 1 is NO in the gas
x measurement sample probe, 2 is a sampling line,
3 is a catalyst-installed sample probe, 4 is a sampling line, 5 is a line switching valve, 6 is a catalyst, and 7 is a NOx meter. As shown in FIG. 3, the NOx measurement sample probe 1 for measuring the NOx concentration of the gas in the gas duct is provided.
The NOx concentration of the gas in the gas duct is measured by the NOx meter 7 through the sampling line 2 and the switching valve 5 for the gas sampled by the probe 1, and another catalyst installation sample probe 3 in which another catalyst 6 is installed is provided. , NOx and N in the gas collected by the probe 3 by the catalyst 6
After reacting with H 3 , the NOx concentration in the reacted gas is measured by the NOx meter 7 through the sampling line 4 and the switching valve 5, and the NOx concentration of the former and the NOx concentration of the latter are measured to determine the NOx concentration in the gas. This is a method of calculating the NH 3 concentration.
【０００４】[0004]
【発明が解決しようとする課題】前述の従来方法におい
ては、サンプリングガス中のＮＯｘがＮＨ3 と反応する
濃度以上存在する必要があり、充分なる濃度が存在しな
ければＮＨ3 が充分消費されない状態となるので各プロ
ーブで計測されたＮＯｘ値の差がＮＨ3 濃度として計測
されない欠点がある。（すなわち、ガス中のＮＨ3 ／Ｎ
Ｏｘモル比が１以上の場合はＮＨ3 濃度の計測ができな
い）触媒によるＮＯｘの分解反応はＮＨ3 の消費量と相
関がありＮＯｘの分解量（ＮＯｘの減少量）がＮＨ3 の
消費量に相当する。したがって従来法でＮＨ3 を計測す
る場合は必ずＮＯｘ濃度の方がＮＨ3 濃度より高くなけ
ればならなかった。In the above-mentioned conventional method, it is necessary that NOx in the sampling gas is present at a concentration higher than that at which it reacts with NH 3, and if the concentration is not sufficient, NH 3 is not sufficiently consumed. Therefore, there is a drawback that the difference between the NOx values measured by the probes is not measured as the NH 3 concentration. (That is, NH 3 / N in the gas
(The NH 3 concentration cannot be measured when the Ox molar ratio is 1 or more.) The NOx decomposition reaction by the catalyst correlates with the NH 3 consumption amount, and the NOx decomposition amount (NOx reduction amount) becomes the NH 3 consumption amount. Equivalent to. Therefore, when measuring NH 3 by the conventional method, the NOx concentration must be higher than the NH 3 concentration.
【０００５】本発明は上記技術水準に鑑み、排ガス中の
ＮＨ3 ／ＮＯｘモル比が１以上である場合でも、ＮＨ3
とＮＯｘが共存する排ガス中のＮＨ3 濃度を計測できる
方法を提供しようとするものである。[0005] The present invention has been made in view of the above prior art, even if NH 3 / NOx molar ratio in the exhaust gas is greater than 1, NH 3
It is intended to provide a method capable of measuring the NH 3 concentration in the exhaust gas in which NOx and NOx coexist.
【０００６】[0006]
【課題を解決するための手段】本発明はＮＨ3 を還元剤
としてＮＯｘを除去するに際して形成されるＮＯｘとＮ
Ｈ3 が共存する排ガス中のＮＨ3 濃度をＮＯｘ計を用い
て計測する方法において、排ガスを抽気するサンプリン
グライン中にＮＨ3 とＮＯｘを反応させる触媒層を設
け、該触媒層の上流に排ガス中のＮＨ3 ／ＮＯｘモル比
が１以下になるようにＮＯｘを注入し、その時の排ガス
中のＮＯｘ濃度〔ＮＯｘ〕1 を計算又はＮＯｘ計により
知り、さらに該触媒層の後流の排ガス中のＮＯｘ濃度
〔ＮＯｘ〕2をＮＯｘ計により知り、〔ＮＯｘ〕1 と
〔ＮＯｘ〕2 の差より元の排ガス中のＮＨ3 濃度を算出
することを特徴とする排ガス中のＮＨ3 濃度の計測方法
である。According to the present invention, NOx and N formed during removal of NOx using NH 3 as a reducing agent.
In a method of measuring the NH 3 concentration in exhaust gas coexisting with H 3 using a NOx meter, a catalyst layer for reacting NH 3 and NOx is provided in a sampling line for extracting the exhaust gas, and the exhaust gas is upstream of the catalyst layer. Of NOx is injected so that the NH 3 / NOx molar ratio becomes 1 or less, and the NOx concentration [NOx] 1 in the exhaust gas at that time is known or calculated by a NOx meter, and further NOx in the exhaust gas downstream of the catalyst layer. A method for measuring NH 3 concentration in exhaust gas, characterized in that the concentration [NOx] 2 is known by a NOx meter, and the original NH 3 concentration in exhaust gas is calculated from the difference between [NOx] 1 and [NOx] 2. .
【０００７】[0007]
【作用】本発明においては、サンプリングラインの触媒
上流側に既知の濃度のＮＯを全ＮＨ3 が反応するように
計量注入する。こうすれば、サンプルガス中のＮＯｘと
注入ＮＯｘの和（濃度）と触媒中で反応した後（触媒後
流で）のＮＯｘ濃度との差をＮＨ3 濃度として計測する
ことができるのでＮＯｘ除去装置でのＮＨ3 注入量がＮ
Ｏｘ量に比して多くても（すなわち、ＮＨ3 ／ＮＯｘモ
ル比が１以上でも）ガス中のＮＨ3 濃度を計測すること
ができる。In the present invention, a known concentration of NO is metered into the sampling line upstream of the catalyst so that all NH 3 reacts. In this way, the difference between the sum (concentration) of NOx in the sample gas and the injected NOx and the NOx concentration after the reaction in the catalyst (in the catalyst downstream) can be measured as the NH 3 concentration, so the NOx removal device The NH 3 injection amount at
It is possible to measure the NH 3 concentration in the gas even if it is larger than the Ox amount (that is, even if the NH 3 / NOx molar ratio is 1 or more).
【０００８】[0008]
【実施例】以下、本発明の実施例を図を参照して説明す
る。 （実施例１）本発明の一実施例を図１によって説明す
る。図１においては、ガスダクト内にガス中のＮＯｘ計
測用サンプルプローブ１を装着し、該プローブ１に接続
するサンプリングライン２に三方向に流路を切り換えら
れる切換弁５を設け、これにサンプリングライン２′を
接続する。該サンプリングライン２′には上流側から順
に、ＮＯ注入用ボンベ（又はタンク）９、流量計１０、
弁１１を備えたＮＯ供給ライン９′、弁１４を備えたサ
ンプリングライン８及び弁１２，１５、触媒６を備えた
サンプリングライン４が接続されており、サンプリング
ライン２，４，８を集約してＮＯｘ計７に接続してい
る。Embodiments of the present invention will now be described with reference to the drawings. (Embodiment 1) An embodiment of the present invention will be described with reference to FIG. In FIG. 1, a sample probe 1 for measuring NOx in gas is mounted in a gas duct, and a sampling line 2 connected to the probe 1 is provided with a switching valve 5 whose flow paths can be switched in three directions. ’Connect. A NO injection cylinder (or tank) 9, a flowmeter 10, and a sampling line 2'in this order from the upstream side.
The NO supply line 9 ′ provided with the valve 11, the sampling line 8 provided with the valve 14, the valves 12 and 15, and the sampling line 4 provided with the catalyst 6 are connected, and the sampling lines 2, 4 and 8 are integrated. It is connected to the NOx meter 7.
【０００９】以下、図１のフローによって、ガスダクト
内のＮＨ3 濃度の計測する方法について説明する。先
ず、従来法と同様にＮＯｘ計測用サンプルプローブ１→
切換弁５→サンプリングライン２→弁１３→ＮＯｘ計７
のラインによりガスダクト内の排ガス中のＮＯｘ濃度を
計測する。次に切換弁５を切り換え、サンプリングライ
ン２′中にＮＯ供給ライン９′よりＮＯを供給し、サン
プリングライン２′中のＮＯｘ濃度を計算（ガスダクト
内の排ガス中のＮＯｘ濃度とＮＯ供給ラインより注入し
たＮＯ濃度の加算）によってか、又はＮＯｘ計測用サン
プルプローブ１→切換弁５→サンプリングライン２′→
サンプリングライン８→弁１４→ＮＯｘ計７のラインに
よりＮＯｘ濃度〔ＮＯｘ〕1 を計測する。A method of measuring the NH 3 concentration in the gas duct will be described below with reference to the flow chart of FIG. First, the sample probe for NOx measurement 1 →
Switching valve 5 → Sampling line 2 → Valve 13 → NOx meter 7
Is used to measure the NOx concentration in the exhaust gas in the gas duct. Next, the switching valve 5 is switched, NO is supplied to the sampling line 2'from the NO supply line 9 ', and the NOx concentration in the sampling line 2'is calculated (the NOx concentration in the exhaust gas in the gas duct and the NO supply line are injected. (Added NO concentration), or sample probe for NOx measurement 1 → switch valve 5 → sampling line 2 ′ →
The NOx concentration [NOx] 1 is measured by the line of sampling line 8 → valve 14 → NOx meter 7.
【００１０】次に、ＮＯ供給ライン９′からＮＯを注入
されたサンプリングライン２′の排ガスをサンプリング
ライン４に導いて、触媒６での反応後の排ガス中のＮＯ
ｘ濃度〔ＮＯｘ〕2 をＮＯｘ計７によって計測し、〔Ｎ
Ｏｘ〕1 −〔ＮＯｘ〕2 から、ガスダクト内の排ガスの
ＮＨ3 濃度を算出する。Next, the exhaust gas in the sampling line 2'injected with NO from the NO supply line 9'is guided to the sampling line 4, and NO in the exhaust gas after the reaction at the catalyst 6 is conducted.
The x concentration [NOx] 2 was measured by the NOx meter 7, and [N
Ox] 1 - from [NOx] 2, and calculates the NH 3 concentration in exhaust gas in the gas duct.
【００１１】このようにすることによって、ガスダクト
中のＮＨ3 ／ＮＯｘモル比が１以上の場合であっても、
ガスダクト中の排ガスのＮＨ3 濃度を計測することがで
きる。ガスダクト中のＮＨ3 ／ＮＯｘモル比が１以下の
場合でも、この実施例方法を採用しても何んら問題はな
い。なお、図１の実施例の場合、触媒６の温度を高めて
反応を促進するため、触媒６を設置したサンプリングラ
イン４を加熱できるようにすることが好ましい。By doing so, even when the NH 3 / NOx molar ratio in the gas duct is 1 or more,
The NH 3 concentration of the exhaust gas in the gas duct can be measured. Even if the NH 3 / NOx molar ratio in the gas duct is 1 or less, there is no problem even if the method of this embodiment is adopted. In the case of the embodiment of FIG. 1, in order to raise the temperature of the catalyst 6 to promote the reaction, it is preferable that the sampling line 4 in which the catalyst 6 is installed can be heated.
【００１２】（実施例２）本発明の他の実施例を図２に
よって説明する。図２においては、ガスダクト内にＮＯ
ｘ計測用サンプルプローブ１と触媒６を設置した触媒設
置サンプルプローブ３を装着し、それぞれに接続したサ
ンプリングライン２，４は一つの切換弁５に接続され、
これらサンプリングライン２，４はＮＯｘ計７に接続さ
れており、また触媒設置サンプルプローブ３の触媒６の
上流にはＮＯ注入用ボンベ（又はタンク）９、流量計１
０、弁１１を設けたＮＯ注入ライン９′が接続されてい
る。(Embodiment 2) Another embodiment of the present invention will be described with reference to FIG. In FIG. 2, NO in the gas duct
The x-measurement sample probe 1 and the catalyst-installed sample probe 3 in which the catalyst 6 is installed are mounted, and the sampling lines 2 and 4 connected to each are connected to one switching valve 5,
These sampling lines 2 and 4 are connected to a NOx meter 7, and an NO injection cylinder (or tank) 9 and a flowmeter 1 are provided upstream of the catalyst 6 of the catalyst-installed sample probe 3.
0, NO injection line 9'provided with valve 11 is connected.
【００１３】以下、図２のフローによって、ガスダクト
内のＮＨ3 濃度を計測する方法について説明する。先
ず、従来法と同様にＮＯｘ計測用サンプルプローブ１→
サンプリングライン２→切換弁５→ＮＯｘ計のラインに
よりガスダクト内の排ガス中のＮＯｘ濃度を計測する。
次にＮＯ注入ライン９′から注入したＮＯ濃度と上記ラ
インで計測したＮＯｘ濃度を加算して触媒設置サンプル
プローブ３の触媒６の上流側のＮＯｘ濃度〔ＮＯｘ〕1
を算出する。そして更に、その触媒６上流のＮＯｘ濃度
を高められた排ガスを、触媒６→サンプリングライン４
→切換弁５→ＮＯｘ計７よりなるラインを経由させ、触
媒６で反応後の排ガス中のＮＯｘ濃度〔ＮＯｘ〕2 をＮ
Ｏｘ計７で計測し、〔ＮＯｘ〕1 −〔ＮＯｘ〕2 から、
ガスダクト内の排ガスのＮＨ3 濃度を算出する。A method of measuring the NH 3 concentration in the gas duct will be described below with reference to the flow chart of FIG. First, the sample probe for NOx measurement 1 →
The NOx concentration in the exhaust gas in the gas duct is measured by the line of sampling line 2 → switching valve 5 → NOx meter.
Next, the NO concentration injected from the NO injecting line 9'and the NOx concentration measured in the above line are added to add NOx concentration [NOx] 1 on the upstream side of the catalyst 6 of the catalyst installation sample probe 3.
To calculate. Further, the exhaust gas having an increased NOx concentration upstream of the catalyst 6 is further fed to the catalyst 6 → the sampling line 4
-> NOx concentration [NOx] 2 in the exhaust gas after the reaction by the catalyst 6 is passed through the line consisting of the switching valve 5-> NOx meter 7
Measured with an Ox meter 7, from [NOx] 1- [NOx] 2 ,
Calculate the NH 3 concentration of the exhaust gas in the gas duct.
【００１４】[0014]
【発明の効果】本発明によれば、ガスダクト内の排ガス
中に存在するＮＨ3 ／ＮＯｘモル比に関係なくガスダク
ト内の排ガス中のＮＨ3 濃度を計測することができる。According to the present invention, the NH 3 concentration in the exhaust gas in the gas duct can be measured regardless of the NH 3 / NOx molar ratio existing in the exhaust gas in the gas duct.
【図１】本発明の一実施例のガスダクト内の排ガス中の
ＮＨ3 濃度を計測するフローの説明図。FIG. 1 is an explanatory diagram of a flow for measuring an NH 3 concentration in exhaust gas in a gas duct according to an embodiment of the present invention.
【図２】本発明の他の実施例のガスダクト内の排ガス中
のＮＨ3 濃度を計測するフローの説明図。FIG. 2 is an explanatory view of a flow for measuring the NH 3 concentration in the exhaust gas in the gas duct of another embodiment of the present invention.
【図３】従来のＮＯｘ計を用いてガスダクト内の排ガス
中のＮＨ3 濃度を計測する一態様のフローの説明図。FIG. 3 is an explanatory view of a flow of one embodiment for measuring the NH 3 concentration in the exhaust gas in the gas duct using the conventional NOx meter.
フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ０１Ｄ 53/56 53/94 Ｇ０１Ｎ 1/00 １０１ Ｒ Ｂ０１Ｄ 53/36 １０１ Ｚ Continuation of front page (51) Int.Cl. 6 Identification code Office reference number FI Technical display location B01D 53/56 53/94 G01N 1/00 101 R B01D 53/36 101 Z
Claims (1)
に際して形成されるＮＯｘとＮＨ3 が共存する排ガス中
のＮＨ3 濃度をＮＯｘ計を用いて計測する方法におい
て、排ガスを抽気するサンプリングライン中にＮＨ3 と
ＮＯｘを反応させる触媒層を設け、該触媒層の上流に排
ガス中のＮＨ3 ／ＮＯｘモル比が１以下になるようにＮ
Ｏｘを注入し、その時の排ガス中のＮＯｘ濃度〔ＮＯ
ｘ〕1 を計算又はＮＯｘ計により知り、さらに該触媒層
の後流の排ガス中のＮＯｘ濃度〔ＮＯｘ〕2 をＮＯｘ計
により知り、〔ＮＯｘ〕1 と〔ＮＯｘ〕2 の差より元の
排ガス中のＮＨ3 濃度を算出することを特徴とする排ガ
ス中のＮＨ3 濃度の計測方法。1. A method for measuring a concentration of NH 3 in exhaust gas in which NOx and NH 3 coexist when NOx is removed using NH 3 as a reducing agent using a NOx meter, in a sampling line for extracting the exhaust gas. Is provided with a catalyst layer for reacting NH 3 and NOx, and N is adjusted so that the NH 3 / NOx molar ratio in the exhaust gas is 1 or less upstream of the catalyst layer.
Ox was injected, and the NOx concentration in the exhaust gas at that time [NO
x] 1 is known or calculated by a NOx meter, and the NOx concentration [NOx] 2 in the exhaust gas downstream of the catalyst layer is known by a NOx meter, and the difference between [NOx] 1 and [NOx] 2 NH 3 concentration of the measuring method in the exhaust gas and calculates the NH 3 concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5255509A JPH07110323A (en) | 1993-10-13 | 1993-10-13 | Ammonia concentration measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5255509A JPH07110323A (en) | 1993-10-13 | 1993-10-13 | Ammonia concentration measuring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07110323A true JPH07110323A (en) | 1995-04-25 |
Family
ID=17279747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5255509A Pending JPH07110323A (en) | 1993-10-13 | 1993-10-13 | Ammonia concentration measuring method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07110323A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6068770A (en) * | 1996-07-12 | 2000-05-30 | Millipore Corporation | Disposable separation module with quick connect capability |
| US6378907B1 (en) | 1996-07-12 | 2002-04-30 | Mykrolis Corporation | Connector apparatus and system including connector apparatus |
| WO2011161839A1 (en) * | 2010-06-24 | 2011-12-29 | 三菱重工業株式会社 | Ammonia compound concentration measuring device and ammonia compound concentration measuring method |
| JP2016080669A (en) * | 2014-10-22 | 2016-05-16 | 九電産業株式会社 | Exhaust gas sampling probe, device and method for measuring leaked ammonia |
-
1993
- 1993-10-13 JP JP5255509A patent/JPH07110323A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6068770A (en) * | 1996-07-12 | 2000-05-30 | Millipore Corporation | Disposable separation module with quick connect capability |
| US6378907B1 (en) | 1996-07-12 | 2002-04-30 | Mykrolis Corporation | Connector apparatus and system including connector apparatus |
| WO2011161839A1 (en) * | 2010-06-24 | 2011-12-29 | 三菱重工業株式会社 | Ammonia compound concentration measuring device and ammonia compound concentration measuring method |
| JP2012008008A (en) * | 2010-06-24 | 2012-01-12 | Mitsubishi Heavy Ind Ltd | Ammonia compound concentration measuring device and ammonia compound concentration measuring method |
| US8895318B2 (en) | 2010-06-24 | 2014-11-25 | Mitsubishi Heavy Industries, Ltd. | Ammonia compound concentration measuring device and ammonia compound concentration measuring method |
| JP2016080669A (en) * | 2014-10-22 | 2016-05-16 | 九電産業株式会社 | Exhaust gas sampling probe, device and method for measuring leaked ammonia |
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