JP3216725U - Chemiluminescent NOx concentration measuring device - Google Patents

Chemiluminescent NOx concentration measuring device Download PDF

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JP3216725U
JP3216725U JP2018000551U JP2018000551U JP3216725U JP 3216725 U JP3216725 U JP 3216725U JP 2018000551 U JP2018000551 U JP 2018000551U JP 2018000551 U JP2018000551 U JP 2018000551U JP 3216725 U JP3216725 U JP 3216725U
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nox concentration
measuring device
ozone generator
silent discharge
concentration measuring
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拓也 北尾
拓也 北尾
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Shimadzu Corp
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Abstract

【課題】正確にNOx濃度を測定することができる化学発光式NOx濃度測定装置を提供する。【解決手段】無声放電式オゾン発生器7で生成したオゾンと試料ガス中のNOが反応槽2内で反応した際に生じる発光強度を検出器3で検出してNOx濃度を測定する化学発光式NOx濃度測定装置で、無声放電式オゾン発生器7と反応槽2とを接続する配管の途中に交換式フィルタ10を配置した。【選択図】図1A chemiluminescent NOx concentration measuring device capable of accurately measuring NOx concentration is provided. A chemiluminescence type in which the emission intensity generated when ozone generated by a silent discharge ozone generator 7 and NO in a sample gas react in a reaction vessel 2 is detected by a detector 3 to measure the NOx concentration. In the NOx concentration measuring device, a replaceable filter 10 was disposed in the middle of a pipe connecting the silent discharge ozone generator 7 and the reaction tank 2. [Selection] Figure 1

Description

本考案は、窒素酸化物(以下、NOxという。)濃度を測定するNOx濃度測定装置であって、特に化学発光によりNOx濃度を測定する化学発光式NOx濃度測定装置に関するものである。   The present invention relates to a NOx concentration measuring device that measures nitrogen oxide (hereinafter referred to as NOx) concentration, and more particularly to a chemiluminescent NOx concentration measuring device that measures NOx concentration by chemiluminescence.

NOx濃度測定は、煙道排ガスや自動車排ガスなどの燃焼排ガスの監視や、燃焼制御、大気空気、トンネル内空気、室内空気または高層空気などの環境測定に用いられている。NOx濃度の測定法の一つとして化学発光法がある。これはNOとオゾンが気相で反応した際に生じる化学発光の強度がNO濃度と比例することを利用するものである。NO2については、触媒などでNOに変換することで、NOx濃度として測定する。
化学発光式NOx濃度測定装置に用いられるオゾン発生器には、乾燥空気に波長185nmの紫外線を照射する低圧水銀灯を用いる紫外線式オゾン発生器があるが、これは低圧水銀灯を定期的に交換しなければならずコストや労力がかかるため、環境監視の用途にはランニングコストが比較的少なく、オゾン発生効率が優れている無声放電を利用する無声放電式オゾン発生器が広く利用されている(例えば、特許文献1参照)。
The NOx concentration measurement is used for monitoring combustion exhaust gas such as flue exhaust gas and automobile exhaust gas, and environmental measurement such as combustion control, atmospheric air, tunnel air, indoor air, or higher air. One method for measuring NOx concentration is chemiluminescence. This utilizes the fact that the intensity of chemiluminescence generated when NO and ozone react in the gas phase is proportional to the NO concentration. About NO2, it converts into NO with a catalyst etc., and measures as NOx density | concentration.
Among ozone generators used in chemiluminescent NOx concentration measuring devices, there is an ultraviolet ozone generator that uses a low-pressure mercury lamp that irradiates dry air with ultraviolet light having a wavelength of 185 nm. Because of the cost and labor required, silent discharge type ozone generators that use silent discharge with relatively low running cost and excellent ozone generation efficiency are widely used for environmental monitoring applications (for example, Patent Document 1).

しかし、無声放電式オゾン発生器は数千ボルトの交流電圧を印加した筐体内に乾燥空気を導入して生成させるため、ステンレス鋼などの金属で製作されている筐体が放電により削られ、微小な金属粉が発生する。また、オゾンの腐食性により筐体にさびが生じたりすることがあった。   However, since the silent discharge ozone generator is generated by introducing dry air into the case to which an AC voltage of several thousand volts is applied, the case made of a metal such as stainless steel is scraped by the discharge and becomes minute. Metal powder is generated. In addition, the case may be rusted due to the corrosive nature of ozone.

特開2008−232640号公報JP 2008-232640 A

化学発光式NOx濃度測定装置における無声放電式オゾン発生器は、構成上、試料ガス中のNOとオゾンが反応する反応槽の前段に配置されているため、オゾン発生器内で放電により生じた微小な金属粉やさびなどの不純物が反応槽内に入り、これらが発光を検出する検出器の窓材などに付着すると、正しい発光強度を測定することができず、測定値低下の原因となる場合があった。特に、環境監視の用途に用いられる化学発光式NOx濃度測定装置にあって、誤測定は多方面に多大の影響を及ぼす。
本考案は、オゾン発生器に無声放電式オゾン発生器を用いる場合であっても、測定値の低下をもたらすことなくNOx濃度を正確に測定することができる化学発光式NOx濃度測定装置を提供することを目的としている。
The silent discharge type ozone generator in the chemiluminescent NOx concentration measuring device is arranged in the front stage of the reaction tank where NO in the sample gas reacts with ozone because of its structure. If impurities such as metallic powder or rust enter the reaction vessel and adhere to the window material of the detector that detects luminescence, the correct luminescence intensity cannot be measured, causing a decrease in the measured value. was there. In particular, in a chemiluminescent NOx concentration measuring device used for environmental monitoring, erroneous measurement has a great influence on many aspects.
The present invention provides a chemiluminescent NOx concentration measuring apparatus capable of accurately measuring NOx concentration without causing a decrease in measured value even when a silent discharge ozone generator is used as the ozone generator. The purpose is that.

上記課題を解決するため、請求項1記載の本考案の化学発光式NOx濃度測定装置は、無声放電式オゾン発生器で生成したオゾンと試料ガス中のNOが反応槽内で反応した際に生じる発光強度を検出してNOx濃度を測定する化学発光式NOx濃度測定装置であって、無声放電式オゾン発生器と反応槽とを接続する配管の途中に交換式フィルタを配置したものである。   In order to solve the above-mentioned problem, the chemiluminescent NOx concentration measuring device according to the first aspect of the present invention is generated when ozone generated by a silent discharge ozone generator reacts with NO in a sample gas in a reaction vessel. This is a chemiluminescent NOx concentration measuring device that detects the emission intensity and measures the NOx concentration, in which an exchangeable filter is arranged in the middle of a pipe connecting the silent discharge ozone generator and the reaction vessel.

交換式フィルタは、フィルタを配管から容易に取り外し可能で、かつオゾンが配管から漏れないよう封止できる構造のカートリッジタイプやインライン型フィルターエレメントなど種々のフィルタを用いることができる。 As the exchangeable filter, various filters such as a cartridge type or an in-line type filter element having a structure in which the filter can be easily removed from the pipe and the ozone can be prevented from leaking from the pipe can be used.

本考案の化学発光式NOx濃度測定装置によれば、無声放電式オゾン発生器内で生じた微小な金属粉などの不純物が反応槽に入る前段で交換式フィルタにより除去されるので、これらが発光を検出する検出器の窓材などに付着するおそれがなくなり、発光強度を正確に測定することができる。したがって、測定値が低下することもなく、信頼性のある環境監視を実施することができる。また、フィルタは交換式であるのでメンテナンスが簡便である。   According to the chemiluminescent NOx concentration measuring device of the present invention, impurities such as fine metal powder generated in the silent discharge ozone generator are removed by the exchange filter before entering the reaction tank, so that they emit light. There is no risk of adhering to the window material of a detector that detects the light emission, and the emission intensity can be measured accurately. Therefore, it is possible to perform reliable environmental monitoring without reducing the measured value. Further, since the filter is replaceable, maintenance is simple.

本考案の化学発光式NOx濃度測定装置の基本構成を示す図である。It is a figure which shows the basic composition of the chemiluminescent type NOx concentration measuring apparatus of this invention.

以下、図面を用いて本考案の化学発光式NOx濃度測定装置について説明する。
図1は、本考案の化学発光式NOx濃度測定装置の基本構成を示しており、1は試料ガス中のNOx濃度を測定する測定部であり、オゾンと試料ガス中のNOが反応する反応槽2と、反応槽2内で反応した際に生じる発光強度を検出する検出器3からなる。
反応槽2は、ステンレス鋼などの金属でその筐体が製作されている。一方、検出器3には反応槽2での発光強度を窓材(図示せず)を介して電気信号に変換するフォトダイオードが用いられる。
The chemiluminescent NOx concentration measuring device of the present invention will be described below with reference to the drawings.
FIG. 1 shows a basic configuration of a chemiluminescent NOx concentration measuring apparatus according to the present invention. Reference numeral 1 denotes a measuring unit for measuring the NOx concentration in a sample gas, and a reaction tank in which ozone and NO in the sample gas react. 2 and a detector 3 for detecting the luminescence intensity generated when reacting in the reaction tank 2.
The reaction tank 2 has a casing made of a metal such as stainless steel. On the other hand, the detector 3 is a photodiode that converts the light emission intensity in the reaction tank 2 into an electric signal through a window material (not shown).

反応槽2の一端には、例えば流量調整弁5を介して吸引ポンプ6が接続されている。
吸引ポンプ6は配管4を介してサンプリングプローブ(図示せず)と接続されており、
吸引ポンプ6により排ガス煙道中の試料ガスがサンプリングプローブを通して吸引され反応槽2に導入される。
A suction pump 6 is connected to one end of the reaction tank 2 via, for example, a flow rate adjusting valve 5.
The suction pump 6 is connected to a sampling probe (not shown) via the pipe 4,
The sample gas in the flue gas flue is sucked through the sampling probe by the suction pump 6 and introduced into the reaction tank 2.

また、反応槽2には、無声放電式オゾン発生器7で生成したオゾンを含んだ空気が導入されるように配管により接続されている。無声放電式オゾン発生器7には、流量調節弁8を介して大気空気が導入され、その導入された空気中の酸素が無声放電によりオゾンに変換される。9はオゾン発生器7用の高圧トランスである。   The reaction tank 2 is connected by piping so that air containing ozone generated by the silent discharge ozone generator 7 is introduced. Atmospheric air is introduced into the silent discharge type ozone generator 7 through the flow rate control valve 8, and oxygen in the introduced air is converted into ozone by silent discharge. Reference numeral 9 denotes a high-pressure transformer for the ozone generator 7.

無声放電式オゾン発生器7で生成したオゾンが反応槽2に導入される配管の途中には交換式フィルタ10が配置されている。交換式フィルタ10としては、フィルタを配管から容易に取り外し可能であり、かつオゾンが配管から漏れないように封止できる構造のカートリッジタイプやインライン型フィルタエレメントなど種々のフィルタを用いることができる。   A replaceable filter 10 is disposed in the middle of a pipe through which ozone generated by the silent discharge ozone generator 7 is introduced into the reaction tank 2. As the replaceable filter 10, various filters such as a cartridge type or an inline filter element having a structure in which the filter can be easily removed from the pipe and the ozone can be sealed from leaking from the pipe can be used.

したがって、交換式フィルタ10により、無声放電式オゾン発生器7内で放電により生じた筐体の微小な金属粉やさびなどの不純物が除去され、これら不純物が反応槽2内に入り込み、発光強度を検出する検出器3の窓材に付着するのを防止する。   Therefore, the exchangeable filter 10 removes impurities such as minute metal powder and rust of the casing generated by the discharge in the silent discharge ozone generator 7, and these impurities enter the reaction tank 2 to increase the emission intensity. Adhering to the window material of the detector 3 to be detected is prevented.

NOx濃度の測定は、試料ガスと無声放電式オゾン発生器7から導入されたオゾンを反応槽2で混合して化学発光を生じさせ、その光強度が検出器3で電気信号に変換され、検出器3からの出力信号が信号処理部11で演算処理されてNOxが測定される。このとき無声放電式オゾン発生器7内で生じた微小な金属粉などの不純物が反応槽2に入る前段で交換式フィルタ10により除去され、これら不純物で妨害されることなく正確な測定が可能となる。   The NOx concentration is measured by mixing the sample gas and the ozone introduced from the silent discharge ozone generator 7 in the reaction tank 2 to generate chemiluminescence, and the light intensity is converted into an electric signal by the detector 3 and detected. The output signal from the device 3 is processed by the signal processing unit 11 and NOx is measured. At this time, impurities such as fine metal powder generated in the silent discharge ozone generator 7 are removed by the exchange filter 10 before entering the reaction tank 2, and accurate measurement is possible without being disturbed by these impurities. Become.

1 ・・・測定部
2 ・・・反応槽
3 ・・・検出器
4 ・・・配管
5、8 ・・・流量調節弁
6 ・・・吸引ポンプ
7 ・・・無声放電式オゾン発生器
9 ・・・高圧トランス
10 ・・・交換式フィルタ
11 ・・・信号処理部
DESCRIPTION OF SYMBOLS 1 ... Measuring part 2 ... Reaction tank 3 ... Detector 4 ... Piping 5, 8 ... Flow control valve 6 ... Suction pump 7 ... Silent discharge type ozone generator 9 ..High-voltage transformer 10 ... replaceable filter 11 ... signal processor

Claims (1)

無声放電式オゾン発生器で生成したオゾンと試料ガス中の窒素酸化物が版塗槽内で反応した際に生じる発光強度を検出して窒素酸化物の濃度を測定する化学発光式NOx濃度測定装置において、 前記無声放電式オゾン発生器と前記反応槽とを接続する配管の途中に交換式フィルタを配置したことを特徴とする化学発光式NOx濃度測定装置。
A chemiluminescent NOx concentration measurement device that detects the emission intensity when ozone generated by a silent discharge ozone generator reacts with nitrogen oxide in the sample gas in the plate coating tank to measure the concentration of nitrogen oxide. The chemiluminescent NOx concentration measuring device according to claim 1, wherein an exchangeable filter is disposed in the middle of a pipe connecting the silent discharge ozone generator and the reaction vessel.
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CN201822029768.8U CN209387526U (en) 2018-02-16 2018-12-05 Chemiluminescence type NOx concentration measuring device

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