JP2000180314A - Measuring apparatus for component to be measured in gas containing combustible gas and measuring method for component, to be measured, by using the apparatus - Google Patents

Measuring apparatus for component to be measured in gas containing combustible gas and measuring method for component, to be measured, by using the apparatus

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Publication number
JP2000180314A
JP2000180314A JP10358085A JP35808598A JP2000180314A JP 2000180314 A JP2000180314 A JP 2000180314A JP 10358085 A JP10358085 A JP 10358085A JP 35808598 A JP35808598 A JP 35808598A JP 2000180314 A JP2000180314 A JP 2000180314A
Authority
JP
Japan
Prior art keywords
exhaust gas
gas
measured
outside
sample
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.)
Pending
Application number
JP10358085A
Other languages
Japanese (ja)
Inventor
Minoru Yokota
稔 横田
Takao Murase
隆生 村瀬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
Original Assignee
NGK Insulators Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NGK Insulators Ltd filed Critical NGK Insulators Ltd
Priority to JP10358085A priority Critical patent/JP2000180314A/en
Publication of JP2000180314A publication Critical patent/JP2000180314A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To obtain a measuring apparatus by which the concentration of a component to be measured can be measured precisely even when a combustible gas is contained at a high concentration as compared with the concentration of oxygen existing in a gas to be measured, by a method wherein an outside-air intake hole is formed near the sample intake port of the sampling tube of an exhaust gas sample or in a part of the flow passage of the exhaust gas sample. SOLUTION: An outside-air intake hole is formed near the sample intake port of the sampling tube of an exhaust gas sample or in a part of the flow passage of the exhaust gas sample, and air is taken into from the outside. When a forced intake method by a pump is used, the outside-air intake hole is arranged normally vertically with reference to the flow passage of the sample. In the case of an intake method using an ejector effect, the outside-air intake hole is arranged so as to be at an acute angle with reference to a direction in which the exhaust gas sample flows. The air is taken into from the outside so as to be mixed with a gas to be measured, and the concentration of oxygen at a sensor part is held sufficiently high with reference to a combustible gas. As a result, it is possible to eliminate a situation that the concentration of the combustible gas in the gas to be measured becomes abnormally high, and that the output of a solid electrolyte sensor indicates an abnormal value.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】 この発明は可燃性ガスを豊
富に含む被測定ガス中の測定成分を正確に測定すること
ができる装置および同装置を利用した測定方法に関す
る。更に詳しくは、焼却炉や各種自動車等の輸送機関等
から排出される燃焼排ガス中に、不完全燃焼などにより
一酸化炭素や燃料の一部である炭化水素等の可燃性ガス
が大量に含まれることが屡々起こるが、このような場合
に於いても被測定ガス中の測定成分、例えば、炭酸ガ
ス、一酸化炭素、NOx 、二酸化硫黄ガス等を正確に
測定することができる装置、および同装置を利用した測
定方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus capable of accurately measuring a component to be measured in a gas to be measured which is rich in flammable gas, and a measuring method using the apparatus. More specifically, the combustion exhaust gas discharged from incinerators, transport vehicles such as various automobiles, and the like contains a large amount of combustible gas such as carbon monoxide and hydrocarbons that are a part of fuel due to incomplete combustion or the like. In such a case, a device capable of accurately measuring the measurement components in the gas to be measured, for example, carbon dioxide, carbon monoxide, NOx, sulfur dioxide gas, etc. The present invention relates to a measuring method using the method.

【0002】[0002]

【従来の技術】 各種燃焼炉や各種自動車等の輸送機関
等の内燃機関から排出される燃焼排ガスの測定方法とし
ては安定化ジルコニア等の固体電解質を用いたガスセン
サを備えた測定装置が応答性、熱安定性等の観点から注
目されており、これらガスセンサを備えた装置を用いて
より正確な測定を行うために、様々な提案がなされてい
る。しかし、安定化ジルコニアなど酸素イオン伝導性の
固体電解質を用いたガスセンサは基本的に酸素センサの
機能を有するため、可燃性ガスの濃度に比較して酸素濃
度が低い条件下では、これらの装置を利用したのでは測
定が不可能となる。この状況を可燃性ガスとしてCOガ
スが含まれている場合を例に挙げて説明する。まず、以
下の反応により被測定ガス中の酸素が酸索センサの電極
上で消費される。 CO+1/2O2=CO2
2. Description of the Related Art As a method for measuring combustion exhaust gas emitted from internal combustion engines such as various combustion furnaces and various transportation vehicles such as automobiles, a measurement device equipped with a gas sensor using a solid electrolyte such as stabilized zirconia has a responsiveness. Attention has been paid from the viewpoint of thermal stability and the like, and various proposals have been made to perform more accurate measurement using the apparatus including these gas sensors. However, a gas sensor using an oxygen ion-conductive solid electrolyte such as stabilized zirconia basically has the function of an oxygen sensor, so these devices must be used under conditions where the oxygen concentration is lower than the concentration of flammable gas. If it is used, measurement becomes impossible. This situation will be described using a case where CO gas is contained as a combustible gas as an example. First, oxygen in the gas to be measured is consumed on the electrode of the acid sensor by the following reaction. CO + 1 / 2O 2 = CO 2

【0003】 このような条件下で、測定雰囲気中の可
燃性ガス濃度が、上記反応において消費される酸素ガス
濃度よりも高濃度領域に達する場合には、センサ近傍に
存在する酸素ガスがすべて消費されてしまい、その結
果、酸素センサの出力(起電力)は、異常に高い値とな
り、測定が不可能となってしまう。そして、このような
状態で正確に測定成分の濃度を正確に測定できる装置お
よび方法が提供されていないのが現状である。特に、排
ガス中の特定成分の排出量に関する環境基準が益々厳し
さを増している現在の状況では、燃焼機関の異常等が起
こったとしても可燃性ガスが異常に高濃度で周囲環境に
排出されることは、瞬時たりとも許されるような状況に
はない。
[0003] Under such conditions, if the concentration of combustible gas in the measurement atmosphere reaches a higher concentration region than the concentration of oxygen gas consumed in the above reaction, all of the oxygen gas present near the sensor is consumed. As a result, the output (electromotive force) of the oxygen sensor becomes an abnormally high value, and measurement becomes impossible. At present, an apparatus and a method capable of accurately measuring the concentration of a measurement component in such a state have not been provided. In particular, in the current situation where the environmental standards regarding the emission of specific components in exhaust gas are becoming increasingly strict, even if an abnormality occurs in the combustion engine, the flammable gas is discharged to the surrounding environment at an abnormally high concentration. It is not in a situation where it is permissible even momentarily.

【0004】[0004]

【発明が解決しようとする課題】 本発明は、上記のよ
うな現状に鑑みてなされたものであり、測定雰囲気中の
可燃性ガス濃度が、可燃性ガスとの反応に於いて消費さ
れる酸素ガス濃度よりも高濃度領域に達する様な濃度で
可燃性ガスを含む被測定ガスの場合でも、正確な測定成
分の濃度測定を行うことができる測定装置、および同装
置を利用した測定方法を提供しようとするものである。
DISCLOSURE OF THE INVENTION The present invention has been made in view of the above situation, and the concentration of flammable gas in a measurement atmosphere is determined by controlling the amount of oxygen consumed in the reaction with the flammable gas. Provides a measurement device that can accurately measure the concentration of a measurement component even in the case of a measured gas containing a flammable gas at a concentration that reaches a higher concentration region than the gas concentration, and a measurement method using the same. What you want to do.

【0005】[0005]

【課題を解決するための手段】 本発明者は、上記課題
を解決するために種々検討した結果、各種排ガスの測定
用装置に於いて、排ガスサンプル採取管の排ガスのサン
プル取り入れ口近傍または排ガスサンプルの流路の一部
に外部から空気を取り入れることができる外部空気取り
入れ孔を設けて、外部から空気を取り入れ、これを被測
定ガスに混合することで、センサ部での酸素濃度を可燃
性ガス濃度に対して充分高く保持することにより、各種
の要因により万が一被測定ガス中の可燃性ガスの濃度が
異常に高濃度となり従前の測定装置では固体電解質セン
サの出力(起電力)が異常に高い値となり、測定が不可
能となってしまうな条件下でも安定して被測定成分の測
定が可能となることを見いだして本発明を完成させたも
のである。
Means for Solving the Problems As a result of various studies to solve the above-mentioned problems, the present inventor has found that in various exhaust gas measuring devices, the exhaust gas sampling pipe has a vicinity of an exhaust gas sampling pipe or an exhaust gas sample. A part of the flow path is provided with an external air intake hole that can take in air from the outside, air is taken in from the outside, and this is mixed with the gas to be measured. By keeping the concentration sufficiently high, the concentration of the flammable gas in the measured gas becomes abnormally high due to various factors, and the output (electromotive force) of the solid electrolyte sensor is abnormally high in the conventional measuring device. The present invention has been completed by finding that the component to be measured can be stably measured even under such conditions that the measurement becomes impossible.

【0006】[0006]

【発明の実施の形態】 本発明に於いて使用可能なセン
サは、炭酸ガス、一酸化炭素ガス、NOx 、二酸化硫
黄ガス等の測定用に使用されているものであれば、特に
問題を生じることなく使用できる。かかるセンサとして
は、特開昭60−61654号公報に記載のセンサが挙
げられる。勿論、上記のセンサに限定されるものではな
いことはいうまでもない。
BEST MODE FOR CARRYING OUT THE INVENTION A sensor which can be used in the present invention causes a particular problem if it is used for measuring carbon dioxide gas, carbon monoxide gas, NOx, sulfur dioxide gas and the like. Can be used without. As such a sensor, a sensor described in JP-A-60-61654 can be mentioned. Of course, it is needless to say that the present invention is not limited to the above sensors.

【0007】 外部から空気を取り入れることができる
外部空気取り入れ孔を排ガスサンプル採取管のサンプル
取り入れ口近傍または排ガスサンプルの流路の一部に設
けて空気を外部から取り入れる構成としては、基本的に
はポンプによる強制吸入法を利用したものと、エゼクタ
効果を利用した吸入法を利用したものの2つの態様があ
る。ポンプによる強制吸入法を利用する装置の場合に
は、外部空気取り入れ孔を排ガスサンプルの流路に対し
て通常は垂直となるように設ける。排ガスを一定の速度
で固体電解質センサ方向に流入させるサンプリング方式
であるエゼクタ効果を利用した吸入法を利用する装置の
場合には、外部空気取り入れ孔は、エゼクタ効果により
外部空気を吸入させ易くするために、排ガスの流れる方
向に対して鋭角となるように角度を設けて配置する必要
がある。外部空気取り入れ孔は、通常は、排ガスサンプ
ル採取管と一体的に成形すればよい。従って、排ガスサ
ンプル採取管と同一の材料を使用して製造すればよい。
腐食性ガスに曝されることがある場合には、ステンレス
やセラミックが、腐食性ガスが存在しない場合には、真
鍮やアルミニウム等の金属が使用される。成形方法とし
ては、排ガスサンプル採取管の成形方法を利用すること
ができる。
A configuration in which an external air intake hole through which air can be introduced from the outside is provided in the vicinity of the sample intake port of the exhaust gas sampling pipe or in a part of the flow path of the exhaust gas sample to take in air from the outside is basically used. There are two modes, one using a forced suction method using a pump and one using a suction method using the ejector effect. In the case of a device using a forced suction method by a pump, an external air intake hole is provided so as to be generally perpendicular to the flow path of the exhaust gas sample. In the case of a device that uses a suction method that uses the ejector effect, which is a sampling method that allows exhaust gas to flow in the direction of the solid electrolyte sensor at a constant speed, the external air intake hole facilitates the intake of external air by the ejector effect. In addition, it is necessary to provide an acute angle with respect to the flowing direction of the exhaust gas. The external air intake hole may usually be formed integrally with the exhaust gas sampling tube. Therefore, it may be manufactured using the same material as the exhaust gas sampling tube.
When exposed to corrosive gases, stainless steel or ceramic is used, and when no corrosive gas is present, metals such as brass and aluminum are used. As a forming method, a method for forming an exhaust gas sampling tube can be used.

【0008】 排ガスサンプル採取管に設けられる外部
空気取り入れ孔の配置場所としては、サンプルガスの流
入孔と固定電解質センサとの接続部との間であればよ
く、特に制限なく設けれることができる。ただし、外部
空気取り入れ孔をあまり固定電解質センサ近くに設ける
と外部空気と排ガスとの混合が不充分となり、測定誤差
を生じる可能性があるので好ましくない。排ガスと外部
から取り入れる空気との混合比を一定の範囲内に制御す
るには、サンプルガスの流路と外部空気取り入れ孔の少
なくともいずれか一方に流量を制御できる手段を設ける
ことが好ましい。そのような手段としてはオリフィス
板、キャピラリ、フィルター等を設けることが好まし
い。被測定ガスである排ガス中に大量のダストが含まれ
る場合には、サンプルガス取り入れ口の先端部にフィル
ターを設けることが必要となるが、この場合には、フィ
ルターによる被測定ガスの吸引抵抗が増加するので、外
部空気取り入れ孔側にも、オリフィス板等を設け外部空
気と排ガスとの吸入量の間のバランスを取ることが必要
である。なお、該フィルターとしてに被測定ガスに含ま
れる中程度の分子であるブタン、ペンタン、ヘキサンや
ベンゼン炭化水素類を捕捉できる分子篩作用を有する材
料を使用してもよい。このような材料としては、各種の
ゼオライト類が挙げられる。
The location of the external air intake hole provided in the exhaust gas sample collection pipe may be between the inflow hole for the sample gas and the connection portion with the fixed electrolyte sensor, and may be provided without any particular limitation. However, it is not preferable that the external air intake hole is provided too close to the fixed electrolyte sensor because mixing of the external air and the exhaust gas becomes insufficient and a measurement error may occur. In order to control the mixing ratio between the exhaust gas and the air taken in from the outside within a certain range, it is preferable to provide a means for controlling the flow rate in at least one of the sample gas flow path and the external air intake hole. As such means, it is preferable to provide an orifice plate, a capillary, a filter, and the like. If a large amount of dust is contained in the exhaust gas, which is the gas to be measured, it is necessary to provide a filter at the tip of the sample gas inlet.In this case, the suction resistance of the gas to be measured by the filter is reduced. Therefore, it is necessary to provide an orifice plate or the like also on the side of the external air intake hole so as to balance the intake amount of the external air and the exhaust gas. As the filter, a material having a molecular sieving function capable of capturing butane, pentane, hexane and benzene hydrocarbons, which are medium-sized molecules contained in the gas to be measured, may be used. Such materials include various zeolites.

【0009】 また、エゼクタ効果を利用した吸入法を
利用する測定装置に於いては、外部空気取り入れ孔の口
径は、排ガスの流路の口径より充分に小さいことが必要
である。また、排ガスサンプルの流路の一部でかつ外部
空気取り入れ孔が設けられる場所よりも前に狭窄部を設
けて排ガスサンプルの流速を早めるようにしてもよい。
このように構成することにより、よりエゼクタ効果が発
揮されることとなるからである。勿論、エゼクタ効果を
利用した測定装置の場合においても、排ガスと外部から
取り入れる空気との混合比を一定の範囲内に制御するた
めに、サンプルガスの流路と外部空気取り入れ孔の少な
くともいずれか一方に流量を制御できる手段を設けるこ
とが好ましい。そのような手段としては、強制吸入法を
利用した装置の場合と同様に、オリフィス板、キャピラ
リ、フィルター等を設けることが好ましい。勿論、この
場合にも、該フィルターとしてに被測定ガスに含まれる
中程度の分子であるブタン、ペンタン、ヘキサンやベン
ゼン炭化水素類を捕捉できる分子篩作用を有する材料を
使用してもよい。
[0009] In a measuring apparatus using an inhalation method utilizing the ejector effect, the diameter of the external air intake hole needs to be sufficiently smaller than the diameter of the exhaust gas flow path. Further, a narrow portion may be provided in a part of the flow path of the exhaust gas sample and before the location where the external air intake hole is provided, so as to increase the flow rate of the exhaust gas sample.
This is because the ejector effect is more exhibited by such a configuration. Of course, even in the case of the measuring device utilizing the ejector effect, at least one of the flow path of the sample gas and the external air intake hole in order to control the mixing ratio of the exhaust gas and the air taken in from the outside within a certain range. It is preferable to provide a means for controlling the flow rate. As such means, it is preferable to provide an orifice plate, a capillary, a filter, and the like, as in the case of the device using the forced inhalation method. Of course, also in this case, a material having a molecular sieving function capable of capturing butane, pentane, hexane or benzene hydrocarbons, which are medium-sized molecules contained in the gas to be measured, may be used as the filter.

【0010】 図1は、ポンプによる強制吸入法を利用
した装置の場合における外部空気取り入れ孔を設けた排
ガスサンプル採取管を装着した測定装置の主要部を模式
的に示したものである。図2は、エゼクタ効果による吸
入法を利用した装置の場合における外部空気取り入れ孔
を設けた排ガスサンプル採取管を装着した測定装置の主
要部を模式的に示したものである。なお、上記のように
構成させた排ガスサンプル採取管を装着することができ
る装置としては、JIS−B−7983により定められ
ている排ガス中の酸素自動計測器等を挙げることができ
る。
FIG. 1 schematically shows a main part of a measuring device equipped with an exhaust gas sampling tube provided with an external air intake hole in the case of a device utilizing a forced suction method by a pump. FIG. 2 schematically shows a main part of a measuring apparatus equipped with an exhaust gas sampling pipe provided with an external air intake hole in the case of an apparatus utilizing a suction method by the ejector effect. In addition, as an apparatus to which the exhaust gas sampling pipe configured as described above can be attached, an automatic oxygen analyzer in exhaust gas specified by JIS-B-7983 can be exemplified.

【0011】 これらの装置を使用して測定する場合に
於いて、外部から取り入れる空気量については特に上下
限はないが、下限については、例えば、自動車などの燃
焼排ガスに於いては、同ガス中の酸素濃度が−8.5%
(酸素が8.5%不足している状態)となる可能性があ
り、このような条件下でも正確に測定できるようにする
には、空気の混合量を45%以上とする必要がある。上
限については、あまり大量の空気を取り入れることで、
センサ感度に影響をおよびし測定誤差を生じる可能性が
考えられるので、使用するセンサの種類にもよるが被測
定ガスの75容量%に相当する量に止めておくことが好
ましい。勿論、センサの種類、測定条件、測定目的等に
応じて、上記の範囲を超える範囲の量の吸気を混入して
もよいことがあるので、測定に先立ち、混合するために
吸入する空気の量を予め検討して、流量を一定範囲内に
制御できるようにオリフィス板、キャピラリ、フィルタ
ー等を調整することが好ましい。
In the measurement using these devices, there is no particular upper or lower limit on the amount of air taken in from outside, but the lower limit is, for example, in the case of combustion exhaust gas from automobiles and the like. Oxygen concentration of -8.5%
(A state in which oxygen is deficient by 8.5%), and it is necessary to set the mixing amount of air to 45% or more to enable accurate measurement even under such conditions. Regarding the upper limit, by taking in too much air,
Since it is conceivable that the sensitivity of the sensor may be affected and a measurement error may occur, it is preferable to limit the amount to 75% by volume of the gas to be measured, depending on the type of the sensor used. Of course, depending on the type of sensor, the measurement conditions, the purpose of measurement, etc., it may be possible to mix intake air in an amount exceeding the above range. It is preferable to consider in advance and adjust the orifice plate, capillary, filter, and the like so that the flow rate can be controlled within a certain range.

【0012】 以下に本発明に係る方法により被測定成
分であり、かつ、可燃性ガス成分でもある一酸化炭素ガ
スを測定した場合を例にとり、本発明を更に説明する。
図1に模式的に示した主要部を有する装置を使用して、
外部空気取り入れ口から外部から空気をサンプル排ガス
と同量取り入れて、排ガス中の一酸化炭素を測定した。
排ガス中の酸素濃度を0.6,1,2,5,10,20
%とし、それぞれ一酸化炭素ガスを0,2,4,6,
8,10%の濃度で含む被測定ガスを調製して、被測定
ガス中の一酸化炭素ガス濃度を測定した。その結果を図
3に示す。外部空気を吸入、混合しなかった場合につい
ても同様に測定した。その結果は図4に示す。本結果か
ら明らかなように、空気混合を行わない状態では1/2
CO≧O2の条件下において、被測定ガスの正確な測定
ができなくなるのに対して、本発明に係る測定装置を使
用して空気混合を行った状態では、上記と同様の1/2
CO≧O2の条件下においても正確な測定が行えるよう
になった。
Hereinafter, the present invention will be further described by taking, as an example, a case where carbon monoxide gas, which is a component to be measured and also a combustible gas component, is measured by the method according to the present invention.
Using an apparatus having the main parts schematically shown in FIG.
The same amount of air as the sample exhaust gas was taken in from the outside through the external air intake, and carbon monoxide in the exhaust gas was measured.
The oxygen concentration in the exhaust gas is 0.6, 1, 2, 5, 10, 20
%, And carbon monoxide gas is 0, 2, 4, 6, respectively.
A gas to be measured containing a concentration of 8, 10% was prepared, and the concentration of carbon monoxide gas in the gas to be measured was measured. The result is shown in FIG. The same measurement was performed when the external air was not inhaled and mixed. The result is shown in FIG. As is clear from the results, when air mixing is not performed, 1/2
Under the condition of CO ≧ O 2 , accurate measurement of the gas to be measured cannot be performed. On the other hand, in the state where air is mixed using the measuring device according to the present invention, the same 1/2 as described above is obtained.
Accurate measurement can be performed even under the condition of CO ≧ O 2 .

【0013】[0013]

【発明の効果】 本発明に係る装置を使用した場合に
は、図3と図4に示した結果から明らかなように、可燃
性ガスが被測定ガス中に存在する酸素濃度に比較して著
しく高い濃度で含まれている場合でも、可燃性ガスが酸
素濃度に対して充分に低い濃度で含まれている場合と同
様に正確に炭酸ガス濃度を測定することができる。つま
り本発明によれば、図5に示す可燃性ガスが酸素濃度に
対して充分に低い濃度で含まれている場合、即ち、1/
2CO<O2に相当する斜線領域のみならず、可燃性ガ
スが被測定ガス中に存在する酸素濃度に比較して著しく
高い濃度で含まれている場合、即ち、式[O2−(1/
2CO)]×100で表される値が0以下となる領域に
相当する領域でも測定成分を正確に測定することができ
るという効果を奏するものである。
When the apparatus according to the present invention is used, as is clear from the results shown in FIGS. 3 and 4, the flammable gas is significantly lower than the oxygen concentration present in the gas to be measured. Even when the flammable gas is contained at a high concentration, the carbon dioxide gas concentration can be measured accurately as in the case where the flammable gas is contained at a concentration sufficiently lower than the oxygen concentration. That is, according to the present invention, when the combustible gas shown in FIG. 5 is contained at a concentration sufficiently lower than the oxygen concentration, that is, 1 /
Not only in the shaded region corresponding to 2CO <O 2 , but also when the combustible gas is contained in a concentration significantly higher than the concentration of oxygen present in the gas to be measured, that is, the formula [O 2 − (1 /
2CO)] × 100 has an effect that a measurement component can be accurately measured even in a region corresponding to a region where the value represented by × 100 is 0 or less.

【図面の簡単な説明】[Brief description of the drawings]

【図1】 本発明に係る外部空気吸入孔を設けた排ガス
サンプル採取管を配設した装置の主要部の模式図であ
る。
FIG. 1 is a schematic view of a main part of a device provided with an exhaust gas sampling pipe provided with an external air suction hole according to the present invention.

【図2】 本発明に係る別の態様の外部空気吸入孔を設
けた排ガスサンプル採取管を配設した装置の主要部の模
式図である。
FIG. 2 is a schematic view of a main part of an apparatus provided with an exhaust gas sampling pipe having an external air suction hole according to another embodiment of the present invention.

【図3】 本発明に係る測定装置により測定したときの
効果を示すグラフである。
FIG. 3 is a graph showing the effect when measured by the measuring device according to the present invention.

【図4】 従来の測定装置により測定したときの測定結
果を示すグラフである。
FIG. 4 is a graph showing measurement results when measured by a conventional measuring device.

【図5】 本発明に係る測定装置により測定可能な領域
を示すチャートである。
FIG. 5 is a chart showing an area that can be measured by the measuring device according to the present invention.

【符号の説明】[Explanation of symbols]

1…固体電解質センサ 1 .... Solid electrolyte sensor

Claims (10)

【特許請求の範囲】[Claims] 【請求項1】 排ガスサンプル採取管のサンプル取り入
れ口近傍または排ガスサンプルの流路の一部に外部から
空気を取り入れることができる外部空気取り入れ孔を設
けたことを特徴とする可燃性ガスを含む排ガス中の測定
成分の測定装置。
An exhaust gas containing a flammable gas, wherein an external air intake hole through which air can be introduced from the outside is provided near a sample intake port of an exhaust gas sample collection pipe or in a part of a flow path of the exhaust gas sample. Measurement device for measuring components inside.
【請求項2】 外部から空気を強制吸入するためのポン
プを設けたことを特徴とする請求項1に記載の装置。
2. The apparatus according to claim 1, further comprising a pump for forcibly sucking air from outside.
【請求項3】 エゼクタ効果を利用して外部から空気を
取り入れることができるように、排ガスの流入方向に対
して鋭角となるように角度を設けて外部空気取り入れ孔
が配設された排ガスサンプル採取管、または、排ガスサ
ンプルの流路部であって、外部空気取り入れ孔の配設箇
所より前の部分に狭窄部を設けた排ガスサンプル採取管
を配置したことを特徴とする請求項1に記載の装置。
3. An exhaust gas sampling system in which an external air intake hole is provided at an acute angle with respect to an exhaust gas inflow direction so that air can be taken in from the outside by utilizing an ejector effect. 2. The exhaust gas sampling pipe according to claim 1, wherein the exhaust gas sampling pipe is provided with a constricted portion in a pipe or a flow path section of the exhaust gas sample, in a portion in front of a location where the external air intake hole is provided. apparatus.
【請求項4】 被測定ガスと外部から取り入れる空気と
の混合比を一定の範囲内に制御するために、サンプルガ
スの流路と外部空気取り入れ孔の少なくともいずれか一
方に流量を制御できる手段としてオリフィス板、キャピ
ラリまたはフィルターが設けられていることを特徴とす
る請求項1〜3のいずれか1項に記載の装置。
4. A means for controlling a flow rate of at least one of a flow path of a sample gas and an external air intake hole in order to control a mixing ratio between a gas to be measured and air introduced from the outside within a predetermined range. 4. The device according to claim 1, wherein an orifice plate, a capillary or a filter is provided.
【請求項5】 該フィルターとして被測定ガスに含まれ
る比較的分子の大きい炭化水素類を捕捉できる分子篩作
用を有する材料を使用することを特徴とする請求項1〜
4のいずれか1項に記載の装置。
5. The filter according to claim 1, wherein a material having a molecular sieving action capable of capturing hydrocarbons having relatively large molecules contained in the gas to be measured is used as the filter.
An apparatus according to any one of the preceding claims.
【請求項6】 排ガスのサンプル取り入れ口近傍または
排ガスサンプルの流路の一部に外部から空気を取り入れ
ることができる外部空気取り入れ孔を設けて、外部から
空気を取り入れることを特徴とする可燃性ガスを含む排
ガス中の測定成分を正確に測定する方法。
6. A flammable gas which is provided with an external air intake hole which can take in air from outside in the vicinity of the exhaust gas sample intake port or in a part of the flow path of the exhaust gas sample. A method for accurately measuring a measurement component in exhaust gas containing methane.
【請求項7】 空気を外部から取り入れる際に、ポンプ
による強制吸入法を用いることを特徴とする請求項6に
記載の方法。
7. The method according to claim 6, wherein a forced suction method using a pump is used when air is taken in from the outside.
【請求項8】 空気を外部から取り入れる際に、エゼク
タ効果を利用する吸入法を用いることを特徴とする請求
項6に記載の方法。
8. The method according to claim 6, wherein air is taken in from the outside by a suction method utilizing an ejector effect.
【請求項9】 被測定ガスと外部から取り入れる空気と
の混合比を一定の範囲内に制御するために、サンプルガ
スの流路と外部空気取り入れ孔の少なくともいずれか一
方に流量を制御できる手段としてオリフィス板、キャピ
ラリまたはフィルターを設けることを特徴とする請求項
6〜8のいずれか1項に記載の方法。
9. A means for controlling the flow rate of at least one of the flow path of the sample gas and the external air intake hole in order to control the mixing ratio between the gas to be measured and the air taken in from the outside within a certain range. 9. The method according to claim 6, wherein an orifice plate, a capillary or a filter is provided.
【請求項10】 該フィルターとしてに被測定ガスに含
まれる比較的分子の大きい炭化水素類を捕捉できる分子
篩作用を有する材料を使用することを特徴とする請求項
6〜9のいずれか1項に記載の方法。
10. The filter according to claim 6, wherein a material having a molecular sieve action capable of capturing hydrocarbons having relatively large molecules contained in the gas to be measured is used as the filter. The described method.
JP10358085A 1998-12-16 1998-12-16 Measuring apparatus for component to be measured in gas containing combustible gas and measuring method for component, to be measured, by using the apparatus Pending JP2000180314A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10358085A JP2000180314A (en) 1998-12-16 1998-12-16 Measuring apparatus for component to be measured in gas containing combustible gas and measuring method for component, to be measured, by using the apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10358085A JP2000180314A (en) 1998-12-16 1998-12-16 Measuring apparatus for component to be measured in gas containing combustible gas and measuring method for component, to be measured, by using the apparatus

Publications (1)

Publication Number Publication Date
JP2000180314A true JP2000180314A (en) 2000-06-30

Family

ID=18457470

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10358085A Pending JP2000180314A (en) 1998-12-16 1998-12-16 Measuring apparatus for component to be measured in gas containing combustible gas and measuring method for component, to be measured, by using the apparatus

Country Status (1)

Country Link
JP (1) JP2000180314A (en)

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